CN112284473B - Gas rotary flowmeter and gas flow measurement method - Google Patents
Gas rotary flowmeter and gas flow measurement method Download PDFInfo
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- CN112284473B CN112284473B CN202011218743.8A CN202011218743A CN112284473B CN 112284473 B CN112284473 B CN 112284473B CN 202011218743 A CN202011218743 A CN 202011218743A CN 112284473 B CN112284473 B CN 112284473B
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- 238000000691 measurement method Methods 0.000 title claims 4
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims description 50
- 230000007704 transition Effects 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 18
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 69
- 230000010349 pulsation Effects 0.000 abstract description 14
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 13
- 230000003139 buffering effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/28—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The embodiment of the invention discloses a gas flow meter and a gas flow metering method, which are invented for reducing pulsation phenomenon generated by the instant flow of discharge. The gas waist wheel flowmeter comprises more than two metering cavities, wherein each metering cavity is provided with a waist wheel group, the more than two waist wheel groups are arranged in parallel, and the relative metering positions of the more than two waist wheel groups in the respective metering cavities are different. The embodiment of the invention is suitable for the occasion of metering the gas such as the fuel gas and the like.
Description
Technical Field
The application relates to the technical field of flowmeters, in particular to a gas flow meter and a gas flow metering method.
Background
The gas waist wheel (Roots) flowmeter is a measuring instrument for continuously or intermittently measuring the flow of gas medium in pipeline, and has the features of high precision, high reliability, long service life, convenient installation and use, etc. it is typical of volumetric flowmeter. Along with the construction and popularization of the gas transmission pipeline, the Buddha flowmeter is widely applied to the fields of industrial and commercial trade metering and standard checking due to the advantages of high precision, good repeatability and the like.
The existing gas roots flowmeter is basically in a single-group combination mode of the roots wheel and the shell, when the structure flowmeter is used on site, the instantaneous flow rate eliminated during normal operation shows sinusoidal fluctuation along with different rotation angles of the roots wheel, namely pulsation exists, so that the repeatability of the flowmeter is poor, and the structure flowmeter is insufficient for meeting the application of occasions with high precision requirements.
Disclosure of Invention
In view of the above, embodiments of the present application provide a gas flow meter and a gas flow metering method, which can reduce pulsation generated by the instantaneous flow of the exhaust gas.
In a first aspect, the embodiment of the application provides a gas flow meter, which comprises more than two metering cavities, wherein each metering cavity is provided with a waist wheel group, the more than two waist wheel groups are arranged in parallel, and the more than two waist wheel groups are positioned at different relative metering positions in the respective metering cavity.
According to a specific implementation manner of the embodiment of the application, the two or more metering cavities are positioned in the same cavity, and air inlets are respectively arranged at positions corresponding to the metering cavities on the cavity.
According to a specific implementation of the embodiment of the application, the cavity is internally provided with a public exhaust channel communicated with the exhaust ports of at least two metering cavities, and the public exhaust channel extends along the length direction of the cavity and is communicated with an air outlet at one end of the cavity.
According to one specific implementation of the embodiment of the application, an inter-group linkage mechanism is arranged between more than two waist wheel groups.
According to one specific implementation of the embodiment of the application, each waist wheel group comprises a first rotor and a second rotor matched with the first rotor, and the inter-group linkage mechanism is connected with the first rotors or the second rotors of more than two waist wheel groups.
According to a specific implementation of the embodiment of the present application, the inter-group linkage mechanism is disposed outside the cavity and is coupled with ends of the first rotor or the second rotor of the two or more lumbar groups.
According to a specific implementation manner of the embodiment of the application, a first gear is connected to a first end of a first rotor of each waist wheel group, a second gear is connected to a first end of a second rotor of each waist wheel group, and the first gear and the second gear are identical in size and meshed with each other;
The inter-group linkage mechanism is meshed with a first gear connected with the first rotors of more than two waist wheel groups or meshed with a second gear connected with the second rotors of more than two waist wheel groups.
According to a specific implementation of the embodiment of the present application, the inter-group linkage is a gear linkage or a synchronous belt.
According to a specific implementation of the embodiment of the present application, the gear linkage mechanism includes a set of inter-group linkage gears, where the inter-group linkage gears are rotatably disposed outside the cavity and meshed with a first gear connected to a first rotor of two or more waist wheel sets or meshed with a second gear connected to a second rotor of two or more waist wheel sets;
Or alternatively
The gear linkage mechanism comprises a main linkage gear, wherein the main linkage gear is rotatably arranged outside the cavity, an intermediate gear is arranged between the main linkage gear and a first gear connected with a first rotor of more than two waist wheel groups, and the intermediate gear is meshed with the main linkage gear and the first gear;
Or alternatively
The gear linkage mechanism comprises a gear ring which is arranged outside the cavity and is meshed with a first gear connected with the first rotors of more than two waist wheel groups or is meshed with a second gear connected with the second rotors of more than two waist wheel groups.
According to one specific implementation of the embodiment of the application, each waist wheel group comprises a first rotor and a second rotor matched with the first rotor;
in each waist wheel group, the included angle between the first rotors of adjacent waist wheel groups is gradually increased in a preset angle gradient in the n first rotors from the first rotor of the 1 st waist wheel group to the first rotor of the n waist wheel group along the clockwise or anticlockwise direction, wherein the first rotor of each waist wheel group is one rotor which is in the same installation cis position along the clockwise or anticlockwise direction in the two rotors of each waist wheel group;
the predetermined angle gradient is determined according to the following formula:
k=90°/n±5°;
wherein k is a predetermined angular gradient;
n is the number of waist wheel groups.
According to a specific implementation of the embodiment of the present application, the two or more metering chambers are two, three or four metering chambers.
According to a specific implementation mode of the embodiment of the application, the partition wall between two adjacent metering cavities is of a symmetrical structure relative to the symmetrical central plane between the two adjacent metering cavities, and the symmetrical central plane passes through the central axis of the cavity;
Or alternatively
The partition wall between two adjacent metering cavities is of an asymmetric structure relative to the symmetry center plane between the two adjacent metering cavities. The central plane of symmetry passes through the central axis of the cavity.
According to a specific implementation of the embodiment of the application, the gas flow meter further comprises a shell, a metering module and a flow meter, wherein the metering module is detachably arranged in the shell, and comprises a cavity with a metering cavity inside and a waist wheel group in each metering cavity;
the shell is provided with a first air inlet and a first air outlet which are communicated with an external air flow conveying pipeline;
the shell is internally provided with a first diversion channel communicated with the first air inlet and the air inlets of the metering cavities, and a second diversion channel communicated with the air outlets of the cavities and the first air outlets.
According to the embodiment of the application, the shell comprises a shell body, wherein the shell body is provided with an opening for taking and placing the metering module, a cover body is covered at the opening, the metering module is arranged in the shell body, and the first air inlet and the first air outlet are arranged on the shell body.
According to a specific implementation of the embodiment of the application, the shell body comprises a pipeline connecting part and a metering module accommodating part;
An airflow buffer cavity and an airflow discharge cavity are arranged in the pipeline connecting part, and the airflow buffer cavity and the airflow discharge cavity are isolated; the air flow buffer cavity is respectively communicated with the first air inlet and the air inlets of the metering cavities, and the air flow discharge cavity is respectively communicated with the air outlet of the cavity and the first air outlet;
the metering module accommodating part is internally provided with a metering module accommodating cavity, and the metering module is arranged in the metering module accommodating cavity.
According to a specific implementation of the embodiment of the present application, the airflow discharging cavity is a cylindrical structure extending along a central axis of the housing, and the airflow buffering cavity is an incomplete annular body structure surrounding the airflow discharging cavity.
According to the embodiment of the application, the air inlets of the metering cavities are arranged on the side wall of the cavity, a preset gap is formed between the inlet of each air inlet of the metering cavity and the inner wall of the metering module accommodating cavity, the air flow buffer cavity is communicated with the preset gap, and the air flow buffer cavity and the metering module accommodating cavity form the first diversion channel.
According to a specific implementation manner of the embodiment of the present application, a transition connecting pipe is connected to the air outlet of the cavity, the transition connecting pipe extends from the air outlet of the cavity to the air flow discharging cavity, and the transition connecting pipe and the air flow discharging cavity form the second diversion channel.
According to a specific implementation of the embodiment of the application, a fluid filtering piece is arranged in the shell between the outlet of the airflow buffering cavity and the air inlet of each metering cavity.
According to a specific implementation of the embodiment of the application, the metering module accommodating cavity is respectively communicated with the airflow buffering cavity and the airflow discharging cavity;
The metering module accommodating cavity is provided with a step at the position where the metering module accommodating cavity is communicated with the airflow buffering cavity, the fluid filtering piece is supported on the step, and the metering module is supported on the fluid filtering piece.
According to a specific implementation manner of the embodiment of the application, the fluid filter comprises a ring-shaped support, a filter hole is formed in the side wall of the support, a filter screen is arranged on the support at a position corresponding to the filter hole, and the support is supported on the step.
According to a specific implementation manner of the embodiment of the application, a bypass opening capable of conducting the first diversion channel and the second diversion channel is arranged on the side wall of the transition connecting pipe, and a differential pressure switch piece is arranged at the bypass opening.
According to a specific implementation manner of the embodiment of the application, the differential pressure switch element comprises a fixed connecting element and an elastic actuating element, wherein the fixed connecting element is arranged on the transition connecting tube, and the elastic actuating element is arranged on the fixed connecting element and seals the bypass opening when the differential pressure switch element is in a free state.
In a second aspect, an embodiment of the present application provides a method for measuring gas flow, which is applied to a gas flow meter, where the gas flow meter includes two or more measurement chambers, each measurement chamber is provided with a set of waist-wheel, and the two or more sets of waist-wheel are arranged in parallel, and the method for measuring gas flow includes:
the air flow enters more than two metering cavities;
more than two waist wheel groups are used for rotation metering;
more than two metering chambers discharge the air flow in a staggered peak mode according to a certain time sequence.
According to the embodiment of the application, more than two waist wheel groups are used for rotation measurement, and the waist wheel groups in at least two measurement cavities are used for linkage rotation for measurement.
According to one specific implementation of the embodiment of the application, each waist wheel group comprises a first rotor and a second rotor matched with the first rotor, wherein the first rotors or the second rotors of the waist wheel groups in at least two metering cavities are connected through an inter-group linkage mechanism,
The waist wheel group in at least two measurement chambers rotates in a linkage way, and the device comprises:
The first rotor or the second rotor of the waist wheel group in the at least two metering cavities rotates in a linkage way through the inter-group linkage mechanism.
According to a specific implementation manner of the embodiment of the application, a first rotor of the waist wheel group in the at least two metering cavities is connected with a first gear, a second rotor is connected with a second gear, and the second gear is meshed with the first gear;
Wherein, the first rotor or the second rotor of the waist wheel group in at least two measurement chambers rotates through inter-group link gear linkage, includes:
the first rotors of the waist wheel groups in the at least two metering cavities are in linkage rotation through the engagement of the first gears and a gear linkage mechanism or a synchronous belt;
Or alternatively
And the second rotors of the waist wheel groups in the at least two metering cavities are in linkage rotation through the engagement of the second gears and a gear linkage mechanism or a synchronous belt.
According to a specific implementation manner of the embodiment of the present application, the discharging of the more than two metering cavities according to a certain time sequence peak staggering includes:
The air flow metered by each metering cavity is discharged through the respective exhaust port of each metering cavity and is converged into a public exhaust channel, and then is discharged through the public exhaust channel;
Or alternatively
The air flow metered by the first part of metering cavity is discharged through the respective exhaust ports of the first part of metering cavity and is converged into the first public exhaust channel, and then is discharged through the first public exhaust channel; the air flow metered by the second part metering cavity is discharged through the respective exhaust ports of the second part metering cavity and is converged into a second common exhaust channel, and then is discharged through the second common exhaust channel;
Or alternatively
The number of the two or more metering cavities is N, N is a natural number which is more than 1 and less than or equal to 8, wherein the air flow metered by each metering cavity is discharged from the air outlet, and the method comprises the following steps:
The air flow measured by the N-1 measuring cavities is discharged through the exhaust ports of the N-1 measuring cavities and is converged into a public exhaust channel, and then is discharged through the public exhaust channel, and the air flow measured by the 1 measuring cavities is discharged through independent exhaust channels communicated with the exhaust ports of the 1 measuring cavities.
According to one specific implementation of the embodiment of the application, each waist wheel group comprises a first rotor and a second rotor matched with the first rotor;
Among n first rotors from the first rotor of the 1 st waist wheel group to the first rotor of the n th waist wheel group, the first rotors of the adjacent waist wheel groups are gradually increased in a preset angle gradient relative to the air inlet of the metering cavity where each waist wheel group is positioned, wherein the first rotors of the waist wheel groups are one rotor which is positioned in the same installation position along the clockwise or anticlockwise direction in the two rotors of the waist wheel groups;
the predetermined angle gradient is determined according to the following formula:
k=90°/n±5°;
wherein k is a predetermined angular gradient;
n is the number of waist wheel groups.
In the embodiment of the application, more than two metering cavities are respectively provided with the waist wheel group, so that the gas volume passing through the flowmeter in unit time can be increased by simultaneously metering in a plurality of metering cavities, and the throughput of the flowmeter is improved. The waist wheel groups in the two or more metering cavities are positioned at different relative metering positions in the respective metering cavities, so that the metering cavities can discharge airflow in a staggered mode, namely, the peaks or the troughs of the airflow discharged by the metering cavities can be staggered, the pulsation of the airflow discharged from the flowmeter after the airflows discharged by the metering cavities are converged is relatively gentle, the pulsation phenomenon of the airflow discharged by the flowmeter can be effectively relieved, and the repeatability of the flowmeter is relatively good.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exploded configuration of a gas roots flowmeter according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a gas flow meter according to an embodiment of the present invention;
FIG. 3 is a schematic view showing an internal structural arrangement of a gas roots flowmeter according to an embodiment of the present invention;
FIG. 4 is a schematic view of the chamber of the gas roots flowmeter of FIG. 3;
FIG. 5 is a schematic view of an embodiment of a waist wheel set arrangement according to the present invention;
FIG. 6 is a schematic diagram of a linkage arrangement according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a linkage arrangement according to another embodiment of the present invention;
Fig. 8 and 9 are schematic views illustrating an arrangement of a linkage structure according to another embodiment of the present invention;
FIG. 10 is a schematic view of a linkage arrangement according to another embodiment of the present invention;
FIG. 11a is a schematic view of an arrangement of a lumbar gear set in accordance with another embodiment of the present invention;
FIG. 11b is a schematic view of a waist wheel set arrangement according to yet another embodiment of the present invention;
FIG. 12 is a schematic view of an arrangement of a lumbar gear set in accordance with another embodiment of the present invention;
FIG. 13 is a schematic view of a gas flow meter with a housing according to another embodiment of the invention;
FIG. 14 is a schematic cross-sectional view of a gas flow meter with a housing according to an embodiment of the invention;
FIG. 15 is a flow chart of a method for measuring gas flow according to an embodiment of the invention;
FIGS. 16a and 16b are schematic diagrams illustrating the flow direction of the gas flow in the gas flow measuring method according to the embodiment of the present invention;
FIG. 17 is a schematic diagram of the flow direction of the gas flow in the gas flow metering method according to another embodiment of the present invention.
Detailed Description
Embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the invention provides a gas flow meter, which comprises more than two metering cavities, wherein each metering cavity is respectively provided with a waist wheel group, the more than two waist wheel groups are arranged in parallel, and the waist wheel groups in the more than two metering cavities are positioned at different relative metering positions in the respective metering cavities.
Wherein the more than two metering chambers may be two, three or four or more metering chambers.
In this embodiment, the gas volume passing through the flowmeter in unit time can be increased by simultaneous metering in the plurality of metering chambers, and throughput of the flowmeter can be improved. The waist wheel groups in the two or more metering cavities are positioned at different relative metering positions in the respective metering cavities, so that the throughput of the flowmeter is provided, and the pulsation phenomenon of the gas flow discharged by the flowmeter can be reduced, thereby ensuring better repeatability of the flowmeter. The embodiment of the invention can be used for metering gases such as fuel gas and the like.
Referring to fig. 1 to 3, an embodiment of the present invention provides a gas flow meter, which includes three metering chambers 10, wherein each metering chamber 10 is provided with a waist wheel set 20, the waist wheel sets 20 in the three metering chambers 10 are arranged in parallel, and the waist wheel sets 20 in the three metering chambers 10 are located at different relative metering positions in the respective metering chambers. The three metering chambers in fig. 1 are 10a,10b,10c, respectively.
The lumbar set 20 in each metering chamber 10 may include a first rotor 201 and a second rotor 202 that mates with the first rotor 201. When the three waist wheel groups 20 are arranged in parallel, the plane where the rotation center lines of the first rotor 201 and the second rotor 202 in one waist wheel group are located is not on the same plane as the plane where the rotation center lines of the first rotor 201 and the second rotor 202 in the other waist wheel groups are located. The rotation center line of the first rotor 201 is the rotation center line of the first rotor 201, and the rotation center line of the second rotor 202 is the rotation center line of the second rotor 202.
The relative metering positions of the waist wheel sets 20 in the three metering chambers 10 in the respective metering chambers may be the relative positions of the rotors (such as the first rotor) in the same mounting order in the three waist wheel sets 20 in the respective metering chambers.
The waist wheel sets 20 in the three metering chambers 10 are positioned at different relative metering positions in the respective metering chambers. For example, the waist wheel sets 20 in the three measuring chambers 10 may be disposed at different angles with respect to the air inlets of the respective measuring chambers 10, in one example, the waist wheel sets 20 in the three measuring chambers 10 may be disposed at different angles with respect to the air inlets of the respective measuring chambers 10, specifically, the waist wheel sets 20 in the three measuring chambers 10 are disposed at different angles with respect to the air inlet direction of the air inlets of the respective measuring chambers 10. The waist wheel group 20 in the metering chamber 10 is disposed at different angles with respect to the air intake direction of the air inlet of the metering chamber 10, and the largest longitudinal section of any rotor in the waist wheel group 20 may be disposed at different angles with respect to the air intake direction of the air inlet of the metering chamber 10, and the largest longitudinal section of a rotor is the largest longitudinal section passing through the rotor central axis of the rotor.
In other embodiments, the waist wheel sets 20 in the three metering chambers 10 may be disposed at different angles with respect to the plane of the inlet end or the outlet end of the inlet port of the respective metering chamber 10. The waist wheel group 20 in the metering cavity 10 is arranged at different angles relative to the plane of the air inlet end or the air outlet end of the air inlet of the metering cavity 10, and the largest longitudinal section of any rotor in the waist wheel group 20 can be arranged at different angles relative to the plane of the air inlet end or the air outlet end of the air inlet of the metering cavity 10.
The gas enters each metering cavity 10 from the gas inlet of each metering cavity 10, the pressure difference between the outside and the inside of the metering cavity 10 pushes the waist wheel group 20 to rotate, and the gas flows out of each metering cavity 10 from the gas exhaust side (also called as gas exhaust end or gas exhaust port and the like) of each metering cavity 10 after passing through the metering cavity 10. By counting the number of revolutions of the rotor in each of the waist-wheel sets 20 (e.g., by counting the number of revolutions of the rotor by a sensor provided at the end of the rotor), the gas flowing through the flowmeter can be metered in combination with the magnitude of the gas flow through the metering chamber 10 for one revolution of the rotor.
In this embodiment, three metering chambers 10 are provided in the chamber, a waist wheel set 20 is respectively provided in each metering chamber 10, and the volume of gas passing through the flowmeter in unit time can be increased by metering in the three metering chambers 10, so as to improve throughput of the flowmeter.
In this embodiment, three metering chambers 10 are adjacently disposed, and the waist wheel sets 20 in the three metering chambers 10 are located at different relative metering positions in the respective metering chambers, so that the peak-staggering and airflow discharging of each metering chamber can be realized, that is, the peaks or troughs of the airflow discharged by each metering chamber can be staggered, so that the pulsation of the airflow discharged from the flowmeter after the airflows discharged by each metering chamber are converged is relatively gentle, the pulsation phenomenon of the airflow discharged by the flowmeter can be effectively reduced, and the repeatability of the flowmeter is relatively good. The repeatability of the flowmeter refers to the difference of the gas flow measured by the flowmeter in different time periods, and the smaller the difference is, the better the repeatability of the flowmeter is.
The arrangement of the waist wheel groups 20 in more than two metering cavities 10 in parallel, that is, the arrangement of more than two metering cavities 10 in parallel, can make the arrangement of each metering cavity 10 relatively compact, thus making the volume of the flowmeter relatively smaller, and also facilitating the rapid merging of the air flows discharged from each metering cavity 10, the air flows discharged from each metering cavity 10 can be merged only through a shorter flow path, and the pulsation phenomenon of the air flow discharged from the flowmeter can be eliminated or reduced earlier or faster.
Referring to fig. 3 to 4, for convenience of assembly, in one example, more than two metering chambers 10 may be located in the same chamber 30, or more than two metering chambers 10 may be located in the same chamber 30, and air inlets 301 are provided in positions corresponding to the respective metering chambers 10 on the chamber 30.
Referring to fig. 2 and 3, an air outlet 302 is provided in the chamber 30, and the air outlet 302 communicates with the air outlet of each metering chamber 10. In another example, there may be multiple air outlets on the chamber 30, one for each metering chamber 10. In addition to having more than two metering chambers 10 within the same chamber 30, in other embodiments, a separate metering chamber or chambers may be provided outside of the chamber 30, and the separately provided metering chamber or chambers may be used in conjunction with more than two metering chambers within the same chamber 30.
The cavity 30 may also be referred to as a cavity. In one example, the cavity has a common exhaust passage in communication with the exhaust ports of at least two metering chambers, the common exhaust passage extending along the length of the cavity and in communication with the air outlet at one end of the cavity.
Referring to fig. 4, the cavity 30 may be in a hollow column shape, that is, the middle of the cavity 30 has a hollow structure 303, and the metering cavity 10 and the waist wheel set 20 extend along the length direction of the cavity 30, so that the volume of the metering cavity 10 can be increased. Wherein, three metering chambers 10 are arranged around the central axis of the chamber body 30, the hollow structure 303 in the middle of the chamber body 30 is communicated with the exhaust side of each metering chamber 10, so that the hollow structure 303 in the middle of the chamber body 30 becomes a common exhaust channel of each metering chamber 10, and the common exhaust channel is communicated with the air outlet 302 of the flowmeter, namely, the air outlet 302 is communicated with the hollow structure 303 in the middle of the chamber body 30. The common exhaust passage is located in the middle of the cavity 30 and is communicated with the air flow outlet of each metering cavity 10, and the air flows discharged from each metering cavity 10 can be converged by a flow path as short as possible, or the air flows can be converged after being discharged from each metering cavity 10, so that the pulsation phenomenon of the air flow discharged by the flowmeter can be eliminated or reduced earlier or faster.
Referring to fig. 1 and 3, the cavity 30 may include a cavity body 304 having openings at both ends, a first end plate 305 provided at a first end of the cavity body 304 and a second end plate 306 provided at a second end thereof, an air inlet provided on the cavity body 304, an air outlet 302 provided on the second end plate 306, and each metering cavity 10 in the cavity 30 may include a first metering chamber 304a and a second metering chamber 304b surrounded by walls, the first metering chamber 304a and the second metering chamber 304b being disposed opposite to each other. In one example, the first and second metering chambers 304a, 304b may each be semi-circular in cross-section.
The lumbar set 20 in each metering chamber 10 may include a first rotor 201 and a second rotor 202 that mates with the first rotor 201. The first rotor 201 and the second rotor 202 have an elongated structure having an 8-shaped cross section.
The radius of rotation of the first rotor 201 may be the same as the radius of a semicircle formed by the cross section of the first metering chamber 304a, and the radius of rotation of the second rotor 202 may be the same as the radius of a semicircle formed by the cross section of the second metering chamber 304b, wherein the second rotor 202 is the same size as the first rotor 201.
The first rotor 201 and the second rotor 202 of each of the lumbar groups 20 are rotatably provided at a first end plate 305 and at a second end plate 306. Bearings may be provided at the locations where the first and second rotors 201 and 202 are rotatably coupled to the first and second end plates 305 and 306.
In one example, an end cover 307 is arranged outside the second end plate 306, the end cover 307 is connected with the second end plate 306, a through hole is arranged on the end cover 307, a transition connecting pipe 308 is connected to the air outlet 302, and the transition connecting pipe 308 extends out of the through hole on the end cover 307. Between the end cover 307 and the second end plate 306, there is a receiving space for storing lubricating oil for providing lubrication to the second ends of the first and second rotors 201 and 202, and in addition, the end cover 307 cooperates with the transition connection pipe 308 to prevent the gas discharged from the gas outlet 302 from adversely affecting the rotational connection structure (e.g., bearings, etc.) between the second ends of the first and second rotors 201 and 202 and the second end plate 306.
To improve accuracy of the metering, a linkage may be provided between the first rotor 201 and the second rotor 202 to link rotation of the first rotor 201 and the second rotor 202, and the linkage between the first rotor 201 and the second rotor 202 may be referred to as an intra-group linkage. The linkage mechanism in the group can be a gear linkage mechanism or a synchronous belt linkage mechanism and the like.
Referring to fig. 5, the waist wheel sets 20 in the three metering chambers 10 are disposed at different angles with respect to the air inlets of the respective metering chambers 10. Among the 3 first rotors (201 a, 201b, 201 c) from the first rotor 201a of the 1 st waist-wheel group 20 to the first rotor 201c of the 3 rd waist-wheel group 20, the first rotors of the adjacent waist-wheel groups 20 are gradually increased in an angle gradient of 30 DEG + -5 DEG relative to the air inlet of the respective metering chamber 10 in the clockwise direction, wherein the first rotor of each waist-wheel group 20 is one rotor in the first mounting order in the clockwise direction among the two rotors of each waist-wheel group 20. In fig. 5, the first rotor 201a, the first rotor 201b, and the first rotor 201c are one rotor in the first mounting order in the clockwise direction.
The included angle of the first rotors 201 of the adjacent waist-wheel sets 20 relative to the air inlets of the respective metering chambers 10 is specifically the included angle of the largest longitudinal section passing through the rotation center axis of the first rotors 201 relative to the air inlet direction of the air inlet of the metering chamber 10 where the first rotors 201 are located.
Referring to fig. 5, in one example, the first rotors 201 of the adjacent lumbar groups 20 are angled at 30 ° in a gradient increasing angle relative to the inlet of the respective metering chamber 10.
In order to ensure that the waist wheel sets 20 in the three metering chambers 10 have relatively stable relative positions during metering, and further reduce the pulsation phenomenon of the gas flow discharged by the flow meter, referring to fig. 6 to 10, in one example, an inter-set linkage mechanism 40 is arranged between the waist wheel sets 20 in the three metering chambers 10, so that the rotation of the waist wheel sets 20 in the three metering chambers 10 has linkage, and the total gas discharge amount after the gas flow discharged by each metering chamber 10 is overlapped can be kept relatively stable in any time period.
Referring to fig. 6, in one example, the inter-group linkage 40 is coupled with a first rotor 201 of each of the lumbar groups 20.
The inter-group linkage 40 may be disposed outside the cavity 30 and coupled with the ends of the first rotors 201 of more than two lumbar groups. In one example, a first gear 2011 is connected to a first end of the first rotor 201 of each of the waist wheel sets, a second gear 2012 is connected to a first end of the second rotor 202 of each of the waist wheel sets, the first gear 2011 and the second gear 2012 are the same size and mesh with each other, and the inter-group linkage mechanism meshes with the first gears 2011 connected to the first rotors 201 of more than two waist wheel sets.
For example, referring to fig. 1, the inter-group linkage mechanism 40 is disposed outside the first end plate 305 and is coupled to an end of the first rotor 201 of each of the lumbar groups 20, wherein the outside of the first end plate 305 is a side of the first end plate 305 facing away from the lumbar groups 20.
The first rotor 201 and the second rotor 202 of each waist wheel group 20 are respectively provided with a rotating shaft at two ends, the rotating shaft at the first end of the first rotor 201 of each waist wheel group 20 passes through a through hole in the first end plate 305 and then is connected with a first gear 2011, the rotating shaft at the first end of the second rotor 202 of each waist wheel group 20 passes through a through hole in the first end plate 305 and then is connected with a second gear 2012, the first gear 2011 and the second gear 2012 are identical in size and are meshed with each other, the first gear 2011 and the second gear 2012 form an inter-group linkage mechanism, and the inter-group linkage mechanism 40 is meshed with the first gear 2011 connected with the first rotor 201 of each waist wheel group 20.
The inter-group linkage 40 may be a gear linkage. Referring to fig. 6, specifically, the inter-group linkage mechanism 40 includes a main linkage gear 401a, and an intermediate gear 402a is provided between the main linkage gear 401a and the first gear 2011 connected to the first rotor 201 of each of the pulley groups 20, and the intermediate gear 402a is meshed with the main linkage gear 401a and the first gear 2011.
In other embodiments, an intermediate gear 402a is provided between the main interlocking gear 401a and the second gear 2012 to which the second rotor 202 of each of the pulley groups 20 is connected, and the intermediate gear 402a is meshed with the main interlocking gear 401a and the second gear 2012.
In this embodiment, the main linkage gear 401a is rotatably disposed at a central position outside the first end plate 305, and is meshed with the first gear 2011 connected to the first rotor 201 of each of the pulley groups 20 through the intermediate gear 402a, and is not meshed with the second gear 2012 connected to the second rotor 202 of each of the pulley groups 20. In this case, the distances from the rotation centers of the first rotor 201 and the second rotor 202 to the rotation center of the main linkage gear 401a may be the same such that the partition wall between the adjacent two metering chambers 10 is of a symmetrical structure with respect to the symmetry center plane between the adjacent two metering chambers 10, the symmetry center plane passing through the central axis of the chamber body 30.
Referring to fig. 7, as an alternative arrangement of the intermediate gear 402a, the intermediate gear 402a may be replaced by an intermediate gear 402b coaxially coupled with the second rotor 202 of each of the pulley sets 20, and the intermediate gear 402b and the first rotor 202 of each of the pulley sets 20 form a duplex gear.
In this embodiment, the air outlet 302 is formed on the second end plate 306, and in other embodiments, the air outlet 302 may also be formed on the first end plate 305.
In this embodiment, the inter-group linkage mechanism 40 is disposed outside the first end plate 305, and in other embodiments, the inter-group linkage mechanism 40 may be disposed outside the second end plate 306, and the outside of the second end plate 306 is the side of the second end plate 306 facing away from the lumbar set 20. In the present embodiment, the inter-group linkage 40 is coupled to an end of the first rotor 201 of each of the lumbar groups 20, and in other embodiments, the inter-group linkage 40 may be coupled to an end of the second rotor 202 of each of the lumbar groups 20.
Fig. 8 and 9 are schematic views of an inter-group linkage mechanism of a gas-wheel flowmeter according to another embodiment of the present invention, and referring to fig. 8 and 9, the mechanism of this embodiment is basically the same as the structure of the embodiment shown in fig. 1, except that in this embodiment, the gear linkage mechanism includes a group of inter-group linkage gears 401b, and the inter-group linkage gears 401b are rotatably disposed outside the first end plate 305 and meshed with the first gears 2011 connected to the first rotors 201 of the respective wheel groups 20. The inter-group linkage gear 401b does not mesh with the second gear 2012 to which the second rotor 202 of each of the pulley groups 20 is connected.
In this embodiment, the inter-group linkage gear 401b is rotatably disposed at a central position outside the first end plate 305, and directly engages with the first gear 2011 connected to the first rotor 201 of each of the lumbar groups 20, but does not engage with the second gear 2012 connected to the second rotor 202 of each of the lumbar groups 20. In this case, the distances from the rotation centers of the first rotor 201 and the second rotor 202 to the rotation center of the inter-group linkage gear 401b are different, so that the partition wall between the adjacent two metering chambers 10 may be of an asymmetric structure with respect to the symmetry center plane between the adjacent two metering chambers 10. The central plane of symmetry passes through the central axis of the cavity 30.
Fig. 10 is a schematic view of an inter-group linkage mechanism of a gas-wheel flowmeter according to another embodiment of the present invention, referring to fig. 10, the mechanism of this embodiment is basically the same as that of the embodiment shown in fig. 1, except that in this embodiment, the inter-group linkage mechanism 40 includes a gear ring 401c, and the gear ring 401c is disposed outside the first end plate 305 and is meshed with a first gear 2011 connected to the first rotor 201 of each of the wheel groups 20.
The present embodiment is not limited thereto, and in other embodiments, the gear ring 401c may also mesh with the second gear 2012 connected to the second rotor 202 of each of the lumbar groups 20.
In another embodiment, the ring gear 401c may be replaced with a timing belt.
Fig. 11a is a schematic diagram of a gas-wheel flowmeter according to another embodiment of the present invention, fig. 11b is a schematic diagram of a gas-wheel flowmeter according to another embodiment of the present invention, and referring to fig. 11a and 11b, the mechanism of this embodiment is basically the same as that of the embodiment shown in fig. 1, in which four metering chambers 10 are provided in the cavity 30, one wheel set 20 is provided in each metering chamber 10, four wheel sets 20 in the four metering chambers 10 are arranged in parallel, and similar to the embodiment with three metering chambers 10 in the cavity 30, in this embodiment, in each wheel set 20, in a clockwise direction, among 4 first rotors 201 from the first rotor 201 of the 1 st wheel set 20 to the first rotor 201 of the 4 th wheel set 20, the first rotors 201 of adjacent wheel sets 20 are gradually increased at an angle of 22.5 ° ± 5 ° relative to the air inlets of the respective metering chambers 10, wherein the first rotors 201 of each wheel set 20 are two rotors of each wheel set 20, and one rotor is mounted clockwise in the first direction.
In fig. 11a, the distances from the rotation centers of the first rotor and the second rotor to the rotation center of the inter-group linkage gear are the same, so that the partition wall between the two adjacent metering chambers may have a symmetrical structure with respect to the symmetry center plane between the two adjacent metering chambers. The central plane of symmetry passes through the central axis of the cavity.
In fig. 11b, the distances from the rotation centers of the first rotor and the second rotor to the rotation center of the inter-group linkage gear are the same, so that the partition wall between the two adjacent metering chambers may have a symmetrical structure with respect to the symmetry center plane between the two adjacent metering chambers. The central plane of symmetry passes through the central axis of the cavity.
In the above embodiments, the cavity 30 has three or four metering chambers 10 therein. Embodiments of the present invention are not limited in this regard and other numbers of metering chambers 10 may be provided within the chamber 30, such as two (as shown in fig. 12), five, six, etc. When the cavity 30 is provided with a plurality of metering cavities 10, each waist wheel group 20 comprises a first rotor 201 and a second rotor 202 matched with the first rotor 201, and the setting angle of the rotors of each waist wheel group 20 can be determined as follows:
In each of the waist wheel sets 20, from the first rotor 201 of the 1 st waist wheel set 20 to the n first rotors 201 of the first rotor 201 of the n th waist wheel set 20, the first rotors 201 of the adjacent waist wheel sets 20 are gradually increased in a preset angle gradient relative to the air inlet (in particular, the air inlet direction of the air inlet) of the metering cavity 10, wherein the first rotors 201 of each waist wheel set 20 are one rotor in the same installation order along the clockwise or anticlockwise direction in the two rotors of each waist wheel set 20;
the predetermined angle gradient is determined according to the following formula:
k=90°/n±5°;
wherein k is a predetermined angular gradient;
n is the number of waist wheel groups. n may be a natural number of 2 or more and 8 or less.
Fig. 13 is a schematic structural view of a gas flow meter according to another embodiment of the present invention, fig. 14 is a schematic sectional structural view of a gas flow meter according to another embodiment of the present invention, and referring to fig. 13 and 14, the mechanism of this embodiment is basically the same as the structure of the embodiment shown in fig. 1, except that the gas flow meter further includes a housing 50, and the metering module is removably disposed in the housing 50. The metering module comprises a cavity 30 with three metering cavities 10 inside and a waist wheel group 20 in each metering cavity 10.
The housing 50 has a housing air inlet 501 (hereinafter referred to as a first air inlet) and a housing air outlet 502 (hereinafter referred to as a first air outlet) for communicating with an external air flow delivery pipe, a first flow guide passage in the housing 50 for communicating the first air inlet with the air inlet (hereinafter referred to as a second air inlet) of each metering chamber 10, and a second flow guide passage for communicating the air outlet 302 (hereinafter referred to as a second air outlet) of the chamber 30 with the first air outlet.
In this embodiment, the metering module is detachably disposed in the housing 50, and when the metering module fails, the metering module can be detached from the housing 50 for quick maintenance or replacement, so as to reduce the influence on the normal production and life of downstream users caused by the failure of the metering module in the roots flowmeter.
In one example, the housing 50 includes a housing body 503, the housing body 503 has an opening for taking and placing a metering module, a cover 504 is covered at the opening, the housing body 503 includes a pipe connection portion 5031 and a metering module accommodating portion 5032, an airflow buffer cavity 50311 and an airflow exhaust cavity 50312 are disposed in the pipe connection portion 5031, the airflow buffer cavity 50311 and the airflow exhaust cavity 50312 are isolated, the first air inlet and the first air outlet are disposed on the pipe connection portion 5031 and are used for being connected with an external air conveying pipe, the airflow buffer cavity 50311 is respectively communicated with the first air inlet and the second air inlet, the airflow exhaust cavity 50312 is respectively communicated with the second air outlet and the first air outlet, and the metering module accommodating portion 5032 has a metering module accommodating cavity therein, and the metering module is disposed in the metering module accommodating cavity.
The gas flow buffer chamber 50311 may buffer the inflowing gas. When the fluid contains impurities with larger particles such as welding slag, after the fluid enters the airflow buffer cavity 50311, a part of the impurities in the fluid can be precipitated in the airflow buffer cavity 50311 in advance due to the influence of gravity on the impurities.
In one example, the airflow discharge chamber 50312 is a cylindrical structure extending along a central axis of the housing 50, and the airflow buffering chamber 50311 is an incomplete annular body structure surrounding the airflow discharge chamber 50312, which has a large buffering space.
The cover 504 and the first end plate 305 of the metering module form a linkage accommodating cavity a, and the inter-group linkage 40 is located in the linkage accommodating cavity a, so that adverse effects of the metering gas on corrosion and the like of the inter-group linkage 40 can be reduced.
In one example, the second air inlet is disposed on a side wall of the cavity 30, a predetermined gap b is provided between an inlet of the second air inlet and an inner wall of the metering module accommodating cavity, the air flow buffer cavity 50311 is communicated with the predetermined gap b, and the air flow buffer cavity 50311 and the metering module accommodating cavity form the first diversion channel.
The predetermined gap b is provided between the inlet of the second air inlet and the inner wall of the metering module accommodating cavity, so that the air flow can be further buffered, and after the air flow enters the metering module accommodating cavity from the air flow buffer cavity 50311, the air flow can enter each metering cavity 10 more stably through the predetermined gap b.
In one example, a fluid filter 60 is disposed in the housing 50 between the outlet of the airflow buffer 50311 and the second air inlet, to filter impurities in the fluid, and prevent the impurities in the airflow from entering the metering chamber 10 to affect or even block the rotation of the rotor in the lumbar set 20.
The metering module accommodating cavity is respectively communicated with the airflow buffering cavity 50311 and the airflow discharging cavity 50312, a step is arranged at the position where the metering module accommodating cavity is communicated with the airflow buffering cavity 50311, the fluid filter piece 60 is supported on the step, and the metering module is supported on the fluid filter piece 60.
In one example, the fluid filter 60 includes a ring-shaped bracket, a filter hole is formed in a sidewall of the bracket, and a filter screen is disposed on the bracket at a position corresponding to the filter hole, wherein the bracket is supported on the step. One end of the support flow can be connected with the bottom of the metering module in a sealing way, and the other end of the support flow is connected with the step surface of the step in a sealing way.
In one example, a transition connection pipe 308 is connected to the air outlet of the cavity 30, the transition connection pipe 308 extends from the air outlet of the cavity 30 into the air flow discharge cavity 50312, and the transition connection pipe 308 and the air flow discharge cavity 50312 form the second diversion channel. The transition connection tube 308 passes through the central portion of the stent.
After entering the air flow buffer cavity 50311 from the first air inlet, the external air flow enters the predetermined gap b in the metering module accommodating cavity through the fluid filtering piece 60, enters each metering cavity 10 through the second air inlet at the predetermined gap b, passes through the common exhaust channel formed by the hollow structure 303 in the middle of the cavity 30 after being collected in each metering cavity 10, enters the transition connecting pipe 308 through the second air outlet communicated with the common exhaust channel, is guided into the air flow discharging cavity 50312 through the transition connecting pipe 308, and is discharged to the external air transmission channel through the first air outlet communicated with the air flow discharging cavity 50312.
When the rotor of the waist wheel set 20 in the metering module is blocked for some reason, the metering module cannot work normally, which affects the normal production and life of the downstream user, in order to avoid this, in one example, a bypass opening is provided on the side wall of the transition connection pipe 308, which can conduct the first diversion channel and the second diversion channel, and a differential pressure switch member 70 is provided at the bypass opening.
When the rotor of the waist wheel set 20 is locked, after the air flows into the air flow buffer cavity 50311 from the first air inlet, the pressure difference between the air flow buffer cavity 50311 and the air flow discharge cavity 50312 increases, and when a certain threshold value is reached, the pressure difference switch member 70 acts to enable the air flow buffer cavity 50311 and the air flow discharge cavity 50312 to be communicated, so that temporary air supply to a downstream user can be realized.
In one example, the differential pressure switch member 70 includes a fixed connection member provided on the transition connection tube 308 and an elastic operation member provided on the fixed connection member and closing the bypass opening when in a free state.
The fixing connection member may be a member for fixing the elastic operation member, and the specific structure is not limited.
The resilient operating member may comprise a component made of a resilient material. The elastic actuating member is displaceable under a predetermined pressure differential.
The elastic operation member is variously implemented, so as to facilitate simpler structure of the flowmeter of the present embodiment, and in some examples, the elastic operation member includes a baffle portion and an elastic connection portion, one end of the elastic connection portion is connected to the baffle portion, and the other end is connected to the fixed connection member, and the baffle portion is covered at a bypass outlet formed in the transition connection pipe 308, where the size of the baffle portion is larger than the aperture size of the bypass outlet.
The baffle part can be made of any material which can not permeate fluid, the shape of the baffle part can be any shape, the thickness of the baffle part can be designed according to the pressure required to be born in actual use, and the size of the baffle part is larger than the aperture size at the outlet of the bypass, so that the bypass is conveniently closed.
The elastic connection part can be made of elastic materials and can deform under the action of external force.
The embodiment of the application also provides a gas flow metering method which is applied to the gas flow meter, wherein the gas flow meter comprises more than two metering cavities, each metering cavity is respectively provided with a waist wheel group, and the more than two waist wheel groups are arranged in parallel, and the gas flow metering method comprises the following steps:
S100, enabling air flow to enter more than two metering cavities;
the set of waist wheels in each metering chamber may include a first rotor and a second rotor cooperating with the first rotor. When three waist wheel groups are arranged in parallel, the plane where the rotation central shafts of the first rotor and the second rotor in one waist wheel group are located is not on the same plane as the plane where the rotation central shafts of the first rotor and the second rotor in other waist wheel groups are located.
S102, more than two waist wheel groups are used for rotation metering.
S104, more than two metering cavities discharge air flow according to a certain time sequence peak staggering.
The fact that the two or more metering cavities discharge the air flow in a staggered mode according to a certain time sequence can mean that in the metering process, the time points of the maximum peak air flow discharged by the two or more metering cavities are different, for example, the time point of the maximum peak air flow discharged by one metering cavity is delayed relative to the time point of the maximum peak air flow discharged by the other metering cavity.
In the embodiment of the application, more than two metering cavities discharge air flow in a staggered mode according to a certain time sequence, so that the wave peaks or wave troughs of the air flow discharged by each metering cavity can be staggered, the pulsation of the air flow discharged from the flowmeter after the air flows discharged by each metering cavity are converged is more gentle, the pulsation phenomenon of the air flow discharged by the flowmeter can be effectively relieved, and the repeatability of the flowmeter is better.
In order to ensure that the waist wheel groups in each metering cavity have relatively stable relative positions in the metering process, the pulsation phenomenon of the gas flow discharged by the flowmeter is further alleviated, and in one example, the rotation metering (step S102) of the two or more waist wheel groups can comprise the linkage rotation of the waist wheel groups in at least two metering cavities to perform metering.
The waist wheel groups in the metering cavities rotate in a linkage way, and the total gas discharge amount after the gas flow discharged by the metering cavities is overlapped can be kept relatively stable in any time period.
In one example, each waist wheel group comprises a first rotor and a second rotor matched with the first rotor, the first rotors or the second rotors of the waist wheel groups in at least two metering cavities are connected through an inter-group linkage mechanism, wherein the waist wheel groups in the at least two metering cavities rotate in a linkage mode, and the first rotors or the second rotors of the waist wheel groups in the at least two metering cavities rotate in a linkage mode through the inter-group linkage mechanism.
In one example, a first rotor of the waist wheel group in the at least two metering cavities is connected with a first gear, a second rotor is connected with a second gear, and the second gear is meshed with the first gear;
the first rotor of the waist wheel group in the at least two metering cavities rotates in a linkage way through an inter-group linkage mechanism, and the first rotor of the waist wheel group in the at least two metering cavities rotates in a linkage way through the engagement of the first gear and a gear linkage mechanism or a synchronous belt;
The embodiment is not limited thereto, and in other embodiments, the first rotor or the second rotor of the lumbar gear set in the at least two metering chambers rotates in a linkage manner through an inter-set linkage mechanism, and the second rotor of the lumbar gear set in the at least two metering chambers rotates in a linkage manner through engagement of the second gear and a gear linkage mechanism or a synchronous belt.
Reference is made to fig. 5. In one example, the more than two metering chambers are discharged in a staggered manner according to a certain time sequence (step S104), and the method comprises the steps that the air flow metered by each metering chamber is discharged through the respective exhaust ports of each metering chamber and is converged into a common exhaust channel, and then is discharged through the common exhaust channel.
Referring to fig. 16a and 16b, in another example, the two or more metering chambers are discharged in a staggered manner according to a certain time sequence (step S104), and the method includes discharging the air flow metered by the first portion of metering chambers through the respective exhaust ports of the first portion of metering chambers and converging into the first common exhaust channel, and then discharging the air flow metered by the second portion of metering chambers through the respective exhaust ports of the second portion of metering chambers and converging into the second common exhaust channel, and then discharging the air flow through the second common exhaust channel.
Referring to fig. 17, in still another example, the two or more metering chambers are discharged in a staggered manner according to a certain time sequence (step S104), and the method comprises that the air flows metered by the N-1 metering chambers are discharged through the common exhaust channel after being discharged through the respective exhaust ports of the N-1 metering chambers and converged into the common exhaust channel, and the air flows metered by the 1 metering chambers are discharged through the independent exhaust channels communicated with the exhaust ports of the 1 metering chambers. Wherein N is the number of the metering cavities, and N is a natural number which is more than 1 and less than or equal to 8.
In one example, each waist wheel group comprises a first rotor and a second rotor matched with the first rotor, in each waist wheel group, in the clockwise or anticlockwise direction, in n first rotors from the first rotor of the 1 st waist wheel group to the first rotor of the n th waist wheel group, the first rotors of the adjacent waist wheel groups are increased in a preset angle gradient relative to the air inlet of the metering cavity where each waist wheel group is located, wherein the first rotor of each waist wheel group is one rotor in the same mounting order in the clockwise or anticlockwise direction, and the preset angle gradient is determined according to the following formula:
k=90°/n±5°;
wherein k is a predetermined angular gradient;
n is the number of waist wheel groups.
The gas flow metering method of the embodiment can be applied to the aforementioned gas flow meter, and its beneficial effects are substantially the same as those of the aforementioned gas flow meter, and will not be described herein.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The present application is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (23)
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| CN202229792U (en) * | 2011-09-30 | 2012-05-23 | 浙江苍南仪表厂 | Double-waist wheel gas Roots flowmeter |
| CN209102162U (en) * | 2018-12-27 | 2019-07-12 | 浙江申易电子科技有限公司 | A kind of multiple flow passages ultrasonic wave gas meter |
| CN213779152U (en) * | 2020-11-04 | 2021-07-23 | 天信仪表集团有限公司 | A gas waist wheel flowmeter |
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| CN101608937B (en) * | 2008-06-20 | 2010-12-01 | 安徽理工大学 | A low pulsation compound gear gear flowmeter |
| WO2012082138A1 (en) * | 2010-12-17 | 2012-06-21 | Colgate-Palmolive Company | Dispensing apparatus |
| US9810377B2 (en) * | 2012-03-07 | 2017-11-07 | Illinois Tool Works Inc. | System and method for improving the accuracy of a rate of decay (ROD) measurement in a mass flow controller |
| DE202018106337U1 (en) * | 2018-11-07 | 2019-01-14 | Sensirion Ag | Pulsation damper for a thermal flow sensor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202229792U (en) * | 2011-09-30 | 2012-05-23 | 浙江苍南仪表厂 | Double-waist wheel gas Roots flowmeter |
| CN209102162U (en) * | 2018-12-27 | 2019-07-12 | 浙江申易电子科技有限公司 | A kind of multiple flow passages ultrasonic wave gas meter |
| CN213779152U (en) * | 2020-11-04 | 2021-07-23 | 天信仪表集团有限公司 | A gas waist wheel flowmeter |
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