CN120467453A - Fluid metering and filling device - Google Patents

Abstract

The invention discloses a fluid metering and filling device which comprises a flow detection module, wherein the flow detection module comprises a first main body part, a throttle plug, an upstream pressure sensor and a downstream pressure sensor. The first body portion includes a first fluid passage, an upstream pressure acquisition passage, and a downstream pressure acquisition passage. The throttle plug is in threaded connection with the first fluid channel and is positioned between the upstream pressure acquisition channel and the downstream pressure acquisition channel, and the throttle plug comprises a mounting hole and a throttle hole which are axially arranged along the throttle plug. The upstream pressure sensor and the downstream pressure sensor are used to detect fluid pressure. The detachable throttle plug is arranged in the flow detection module to change the upstream and downstream fluid pressure, and the corresponding fluid flow is calculated based on the upstream and downstream fluid pressure difference. The mounting hole of the throttle plug can be matched with an external torque applying tool to screw the throttle plug, so that the throttle plug can be conveniently mounted, dismounted and replaced, and the universality and expansibility of the flow detection module are improved.

Description

Fluid metering and filling device

Technical Field

The invention belongs to the technical field of fluid filling, and particularly relates to a fluid metering and filling device.

Background

In industries such as chemical industry, energy, pharmacy, food processing, etc., fluid metering and filling devices are widely applied to scenes such as material proportioning, quantitative conveying, accurate filling, etc. The flow detection module of the existing fluid metering and filling device is a core component of the existing fluid metering and filling device and is mainly used for monitoring and controlling the fluid flow in real time.

The existing flow detection module generally comprises a flowmeter and an electric control valve, wherein the flowmeter is used for detecting the fluid flow, and the electric control valve is used for adjusting the fluid flow in the flowmeter. Existing flowmeters generally comprise orifice plate flowmeters, vortex shedding flowmeters, thermal flowmeters, turbine flowmeters, electromagnetic flowmeters and the like. The orifice plate flowmeter is often required to be custom designed according to the requirements of users, so that the universality and expansibility of the orifice plate flowmeter are poor, the vortex street flowmeter is poor in working environment with large vibration, the vortex flow detection element is sensitive to vibration, the thermal flowmeter can generate errors when the temperature of fluid changes, the price is high, the turbine is required to be maintained regularly when the turbine flowmeter works, the axial abrasion problem is solved or the paddle wheel is replaced, the service life is short, the measurement is poor after the shaft is abraded, the electromagnetic flowmeter cannot detect non-conductive gas and liquid, and the application range is narrow.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a fluid metering and filling device, which is used for solving the problem that a flowmeter of the fluid metering and filling device cannot meet a plurality of flow detection requirements.

In order to achieve the above object, a specific embodiment of the present invention provides a fluid metering and filling device, which includes a flow rate detection module including a first body portion, a throttle plug, an upstream pressure sensor, and a downstream pressure sensor. The first body portion includes a first fluid passage, an upstream pressure acquisition passage in communication with the first fluid passage, and a downstream pressure acquisition passage in communication with the first fluid passage. The throttle plug is in threaded connection in the first fluid channel and is located between the upstream pressure acquisition channel and the downstream pressure acquisition channel, the throttle plug comprises mounting holes and throttle holes which are axially distributed along the throttle plug, the aperture of the throttle hole is smaller than that of the mounting holes, and the shape of the vertical projection of the mounting holes is polygonal on a plane vertical to the axial direction of the throttle plug. The upstream pressure sensor is used for detecting the fluid pressure in the upstream pressure acquisition channel, and the downstream pressure sensor is used for detecting the fluid pressure in the downstream pressure acquisition channel.

In one or more embodiments of the invention, the orifice is located on a side of the mounting hole that is adjacent to the downstream pressure collection channel.

In one or more embodiments of the invention, the upstream end of the downstream pressure acquisition channel is less distant from the throttle plug than the downstream end thereof in the axial direction of the first fluid channel.

In one or more embodiments of the invention, the upstream pressure sensor and the downstream pressure sensor are arranged on the same surface of the first main body part, the flow detection module further comprises a sensor fixing piece arranged on the first main body part, and the sensor fixing piece comprises a limiting part propped against one side of the upstream pressure sensor and one side of the downstream pressure sensor away from the first main body part.

In one or more embodiments of the present invention, a first limiting groove and a second limiting groove are formed on a side of the limiting portion facing the first main body portion, a partial region of the upstream pressure sensor is accommodated in the first limiting groove, and a partial region of the downstream pressure sensor is accommodated in the second limiting groove.

In one or more embodiments of the present invention, the first body part further includes a temperature measurement channel communicating with the first fluid channel, the flow detection module further includes a temperature sensor disposed in the temperature measurement channel and an electronic control valve disposed on an outer surface of the first body part, the electronic control valve communicating with an upstream end of the first fluid channel, and the flow detection module further includes a control unit electrically connected to the upstream pressure sensor, the downstream pressure sensor, the temperature sensor and the electronic control valve at the same time, the control unit being configured to control an opening degree of the electronic control valve based on detection data of the upstream pressure sensor, the downstream pressure sensor and the temperature sensor.

In one or more embodiments of the invention, the flow detection module further comprises an electrically controlled valve having an output in communication with the upstream end of the first fluid passage, and the fluid metering and filling device further comprises a pressure regulating module in communication with the input of the electrically controlled valve for regulating the pressure of the fluid delivered into the first fluid passage.

In one or more embodiments of the present invention, the pressure regulating module includes a second body portion and a pressure regulating valve provided on the second body portion, a pressure regulating input channel communicating with an input end of the pressure regulating valve and a pressure regulating output channel communicating with an output end of the pressure regulating valve are formed in the second body portion, and the pressure regulating output channel is also communicating with an input end of the electronic control valve.

In one or more embodiments of the present invention, a pressure measuring channel is formed in the second body portion, which is in communication with the pressure regulating output channel and penetrates to the outer surface of the second body portion, and in the pressure measuring state, the pressure measuring channel is used for connecting with the pressure testing device, and in the pressure regulating state, the pressure measuring channel is used for installing the plug.

In one or more embodiments of the present invention, the fluid metering and filling device further includes a main control module electrically connected to the control unit, wherein the main control module is configured to set a target flow rate of the fluid in the first fluid channel, and send the target flow rate to the control unit.

In one or more embodiments of the present invention, the control unit includes a main control circuit board and an extension circuit board disposed opposite to each other along a direction perpendicular to an axial direction of the first fluid passage, and the flow detection modules are disposed in plurality and arranged along a direction perpendicular to the main control circuit board and the extension circuit board, and the main control circuit board of one of the adjacent two flow detection modules is electrically connected to the extension circuit board of the other one of the adjacent two flow detection modules.

In one or more embodiments of the present invention, the first body portions of two adjacent flow rate detection modules are connected by a connecting rivet.

In one or more embodiments of the invention, the fluid metering and filling device further comprises a termination module electrically connected to the control unit, the termination module being adapted to provide a 120 Ω termination resistance.

Compared with the prior art, the detachable throttle plug is arranged in the flow detection module to change the upstream and downstream fluid pressure, and the corresponding fluid flow is calculated based on the upstream and downstream fluid pressure difference. The mounting hole of the throttle plug can be matched with an external torque applying tool to screw the throttle plug, so that the throttle plug can be conveniently mounted, dismounted and replaced, and the universality and expansibility of the flow detection module are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a perspective view of a fluid metering and filling device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing a flow detection module and a voltage regulation module according to an embodiment of the present invention;

FIG. 3 is a schematic diagram showing another cross-sectional structure of the flow detection module and the pressure regulation module according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a flow detection module according to an embodiment of the present invention;

FIG. 5 is an exploded view of a localized area of a flow sensing module according to one embodiment of the present invention;

FIG. 6 is an exploded view of an upstream pressure sensor, a downstream pressure sensor, and a sensor mount according to one embodiment of the present invention;

FIG. 7 is a perspective view of a throttle plug according to an embodiment of the present invention;

FIG. 8 is a perspective view of a flow detection module and a pressure regulation module according to an embodiment of the present invention;

FIG. 9 is a perspective view of a flow detection module and a pressure regulation module according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of a flow detection module and a main control module according to an embodiment of the invention.

The main reference numerals indicate 1, a flow detection module, 11, a first body part, 111, a first fluid channel, 112, an upstream pressure acquisition channel, 113, a downstream pressure acquisition channel, 114, a second fluid channel, 115, a temperature measurement channel, 116, a screw hole, 12, a throttle plug, 121, a mounting hole, 122, a throttle hole, 13, an upstream pressure sensor, 14, a downstream pressure sensor, 15, a sensor fixing member, 151, a limit part, 1511, a first limit groove, 1512, a second limit groove, 152, a connection part, 16, a temperature sensor, 17, an electric control valve, 18, a main control circuit board, 181, an output interface, 19, an expansion circuit board, 191, an input interface, 110, a protective case, 2, a pressure regulating module, 21, a second body part, 211, a pressure regulating input channel, 212, a pressure regulating output channel, 213, a pressure measuring channel, 214, a plug, 22, a pressure regulating valve, 3, a main control module, 4, a terminal module, 5, a connection rivet, 6, and a set screw.

Detailed Description

In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

In the description of the present invention, it should be understood that the terms "top," "bottom," "upper," "lower," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "second", "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a second" or "a first" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In one embodiment, referring to fig. 1, the present invention provides a fluid metering and filling device, which includes a flow detection module 1, a pressure regulating module 2, a main control module 3, and a terminal module 4.

The flow rate detection module 1 is used for delivering fluid, and the flow rate detection module 1 can detect parameters such as fluid pressure, fluid temperature and the like in the flow rate detection module and calculate the flow rate of the fluid based on the parameters. The pressure regulating module 2 is connected with the flow detection module 1 and the fluid supply source, and the pressure regulating module 2 is located at the upstream of the flow detection module 1 and is used for regulating the pressure of the fluid delivered to the flow detection module 1 by the fluid supply source. The main control module 3 is electrically connected with the flow detection module 1, the main control module 3 is used for setting the target flow of the fluid in the flow detection module 1 and sending the target flow to the flow detection module 1 in the form of an electric signal, and the flow detection module 1 adjusts the flow of the fluid in the flow detection module 1 to the target flow according to the received electric signal. The terminal module 4 is connected with the signal output end of the flow detection module 1, and the terminal module 4 CAN provide 120 omega terminal resistance for CAN communication, so as to realize impedance matching, eliminate signal reflection and improve CAN communication stability.

The structure of the flow rate detection module 1 is further described below.

In one embodiment, referring to fig. 2, 4,5 and 7, the flow rate detection module 1 includes a first body portion 11, a throttle plug 12, an upstream pressure sensor 13 and a downstream pressure sensor 14.

The first body 11 is generally configured as a cubic metal block, and a first fluid passage 111 is formed inside the first body 11, the first fluid passage 111 extending in a straight line and penetrating to the outer surface of the first body 11 at both ends thereof.

The throttle plug 12 is screwed into the first fluid passage 111, and a mounting hole 121 and an orifice 122 arranged in the axial direction thereof are formed in the throttle plug 12, and the orifice 122 has a smaller aperture than the mounting hole 121. The orifice 122 serves to reduce the cross-sectional area of the first fluid passage 111, the fluid accelerates at the orifice 122, and the fluid pressure downstream of the orifice 122 is reduced, so that a pressure difference is generated between the fluid upstream and downstream of the throttle plug 12. The perpendicular projection of the mounting hole 121 has a polygonal shape on a plane perpendicular to the axial direction of the throttle plug 12, and the mounting hole 121 can be engaged with an external torque application tool to screw the throttle plug 12 for easy installation, removal, and replacement of the throttle plug 12.

The aperture of the orifice 122 of the throttle plug 12 can be adaptively adjusted according to actual requirements, so that when the requirements of different users are met, only the throttle plug 12 with the corresponding aperture is needed to be selected, the internal channel structure of the first main body part 11 is not needed to be adjusted, and the universality and expansibility of the flow detection module 1 are improved.

Preferably, the mounting hole 121 may be provided as an inner hexagonal hole. The mounting hole 121 has a regular hexagonal shape in a perpendicular projection on a plane perpendicular to the axial direction of the throttle plug 12.

The upstream pressure sensor 13 and the downstream pressure sensor 14 are provided on the outer surface of the first body portion 11, and an upstream pressure collecting channel 112 and a downstream pressure collecting channel 113 communicating with different portions of the first fluid channel 111 are also formed inside the first body portion 11, and each of the upstream pressure collecting channel 112 and the downstream pressure collecting channel 113 extends straight through to the outer surface of the corresponding position of the first body portion 11. The upstream pressure collecting passage 112 is located upstream of the throttle plug 12, and the upstream pressure collecting passage 112 is also communicated to a detection port of the upstream pressure sensor 13 so that the upstream pressure sensor 13 detects the fluid pressure upstream of the throttle plug 12. Downstream pressure collection channel 113 is located downstream of throttle plug 12, downstream pressure collection channel 113 also communicates to the detection port of downstream pressure sensor 14, so that downstream pressure sensor 14 detects the fluid pressure downstream of throttle plug 12.

Further, the flow detection module 1 further comprises a control unit, the control unit comprises a main control circuit board 18, and two pressure acquisition circuits electrically connected with the upstream pressure sensor 13 and the downstream pressure sensor 14 are integrated on the main control circuit board 18. After the control unit collects the fluid pressure upstream and downstream of the throttle plug 12, the corresponding fluid flow is calculated according to the built-in algorithm. The built-in algorithm is based on the bernoulli equation and the continuity equation in the fluid mechanics, and the fluid flow is deduced by measuring the fluid pressure difference before and after the throttle plug 12, and the specific calculation mode is easily known to those skilled in the art, and is not repeated in the present invention.

Considering that the aperture of the mounting hole 121 is relatively large, when the mounting hole 121 is disposed downstream of the orifice 122, the fluid flow rate is reduced, and the fluid pressure detected by the downstream pressure sensor 14 is increased.

To solve the above problem, in an embodiment, referring to fig. 4 and 5, the orifice 122 is located on the side of the mounting hole 121 near the downstream pressure collecting passage 113, the orifice 122 is relatively near the downstream pressure collecting passage 113, the mounting hole 121 is relatively near the upstream pressure collecting passage 112, the hole diameter of the mounting hole 121 is large, the influence on the fluid flow rate and the fluid pressure upstream of the throttle plug 12 is small, and the detection error caused is relatively small, or even negligible.

Further, the upstream pressure acquisition channel 112 is perpendicular to the first fluid channel 111. In order to reduce the detection error of the downstream pressure sensor 14 so that the upstream end of the downstream pressure collecting passage 113 should be as close to the orifice 122 of the throttle plug 12 as possible, the downstream pressure collecting passage 113 is provided as an inclined passage, and the downstream pressure collecting passage 113 is provided so that the distance of the upstream end of the downstream pressure collecting passage 113 from the throttle plug 12 is smaller than the distance of the downstream end thereof from the throttle plug 12 in the axial direction of the first fluid passage 111.

In an embodiment, referring to fig. 4 to 6, the upstream pressure sensor 13 and the downstream pressure sensor 14 are disposed on the same surface of the first body 11, the flow detection module 1 further includes a sensor fixing member 15 disposed on the first body 11, the sensor fixing member 15 includes two connection portions 152 and a limiting portion 151, the two connection portions 152 are fixed on the first body 11 by bolts, the limiting portion 151 is connected to the two connection portions 152 and abuts against a side of the upstream pressure sensor 13 and the downstream pressure sensor 14 away from the first body 11, and the upstream pressure sensor 13 and the downstream pressure sensor 14 are fixed on an outer surface of the first body 11.

Further, in order to improve the fixing effect of the sensor fixing member 15 on the upstream pressure sensor 13 and the downstream pressure sensor 14, the probability of loosening the upstream pressure sensor 13 and the downstream pressure sensor 14 in the use process is reduced, a first limiting groove 1511 and a second limiting groove 1512 are formed on one side of the limiting portion 151 facing the first main body portion 11, a partial area of the upstream pressure sensor 13 is accommodated in the first limiting groove 1511, and a partial area of the downstream pressure sensor 14 is accommodated in the second limiting groove 1512.

In order to improve the calculation accuracy when calculating the fluid flow rate in the first fluid passage 111, it is necessary to correct the calculated flow rate value based on the fluid temperature, in consideration of the influence of the temperature on the fluid density.

To solve the above problem, in one embodiment, referring to fig. 2, 3 and 9, the first body 11 further includes a temperature measurement channel 115 in communication with the first fluid channel 111, and the flow detection module 1 further includes a temperature sensor 16 disposed in the temperature measurement channel 115. The temperature sensor 16 is electrically connected to the control unit, and the temperature sensor 16 can detect the fluid temperature in the flow detection module 1 and transmit detection data to the control unit, and the control unit calculates a more accurate fluid flow based on the received fluid pressure data and fluid temperature data.

In an embodiment, referring to fig. 2, 8 and 9, the flow detection module 1 further includes an electrically controlled valve 17 disposed on an outer surface of the first body portion 11, where the electrically controlled valve 17, the upstream pressure sensor 13 and the downstream pressure sensor 14 are disposed together on the same outer surface of the first body portion 11. The electric control valve 17 is electrically connected to the control unit, and an internal passage of the electric control valve 17 communicates with an upstream end of the first fluid passage 111. The control unit is configured to control the opening degree of the electronically controlled valve 17 based on the detection data of the upstream pressure sensor 13, the downstream pressure sensor 14, and the temperature sensor 16, and thereby adjust the fluid flow rate in the first fluid passage 111 such that the fluid flow rate in the first fluid passage 111 reaches the target flow rate.

Further, the electrically controlled valve 17 includes, but is not limited to, a proportional solenoid valve.

In an embodiment, referring to fig. 2, 8 and 9, the control unit of the flow detection module 1 includes a main control circuit board 18 and an extension circuit board 19 electrically connected, and the main control circuit board 18 and the extension circuit board 19 are substantially parallel to the first fluid channel 111 and are also disposed opposite in a direction perpendicular to the axial direction of the first fluid channel 111. The main control circuit board 18 is integrated with a pressure acquisition circuit, a temperature acquisition circuit and an opening degree adjusting circuit, the main control circuit board 18 is provided with an output interface 181, and the expansion circuit board 19 is provided with an input interface 191, so that the flow detection module 1 is connected with other expansion modules.

Further, the flow detection modules 1 are provided in plurality, the flow detection modules 1 are arranged along the direction perpendicular to the main control circuit board 18 and the expansion circuit board 19, and the main control circuit board 18 of one of the two adjacent flow detection modules 1 is electrically connected with the expansion circuit board 19 of the other one.

Further, the first body parts 11 of two adjacent flow detection modules 1 are connected through the connecting rivet bolt 5, a screw hole 116 is formed in the first body part 11, and a set screw 6 matched with the connecting rivet bolt 5 is arranged in the screw hole 116.

Specifically, two ends of the connecting rivet bolt 5 are respectively inserted into the two adjacent flow detection modules 1, and the set screw 6 is approximately perpendicular to the connecting rivet bolt 5 and serves as a locking element. When the set screw 6 is screwed, the tip of the set screw 6 can push against the inner hole of the connecting rivet 5 or the matched component to lock the position of the connecting rivet 5, so that the connecting rivet 5 is prevented from loosening.

In an embodiment, referring to fig. 1 to 3, the flow detection module 1 further includes a protective housing 110 disposed on the first main body 11, and the upstream pressure sensor 13, the downstream pressure sensor 14, the electric control valve 17, the main control circuit board 18, and the expansion circuit board 19 are all located in the protective housing 110.

The structure of the regulator module 2 is further described below.

In one embodiment, referring to fig. 2 and 3, the pressure regulating module 2 is in communication with an input of the electrically controlled valve 17, the pressure regulating module 2 being adapted to regulate the pressure of fluid delivered into the first fluid passage 111. The pressure regulating module 2 includes a second body portion 21 and a pressure regulating valve 22 provided on the second body portion 21, and the second body portion 21 is disposed adjacent to the first body portion 11 and is fixed to the first body portion 11 by bolts. The second body portion 21 has a pressure-regulating input passage 211 and a pressure-regulating output passage 212 formed therein. The pressure regulating input channel 211 communicates with the fluid supply and the input of the pressure regulating valve 22, respectively, and the pressure regulating output channel 212 communicates with the output of the pressure regulating valve 22 and the input of the electronic control valve 17, respectively.

Further, a second fluid channel 114 is formed in the first body 11, the second fluid channel 114 is in communication with the input end of the electric control valve 17 and the pressure regulating output channel 212, and the first fluid channel 111 and the second fluid channel 114 are spaced apart in a direction perpendicular to the fluid flow direction.

In one embodiment, referring to fig. 3, a pressure measuring channel 213 is formed in the second body 21, communicating with the pressure regulating output channel 212 and penetrating to the outer surface of the second body 21. In the pressure-measuring state, the pressure-measuring channel 213 is used for connection with a pressure test device by which the fluid pressure in the pressure-regulating output channel 212 is detected. In the pressure-adjusting state, the plug 214 is installed in the pressure-measuring channel 213, and the pressure-measuring channel 213 is blocked by the plug 214, so that the fluid is prevented from flowing out of the second main body 21 through the pressure-measuring channel 213.

In an embodiment, referring to fig. 1, the pressure regulating module 2 is provided with a plurality of pressure regulating modules 2, and the plurality of pressure regulating modules 2 are connected to the plurality of flow detecting modules 1 in a one-to-one correspondence manner, and the pressure regulating output channels 212 in the pressure regulating modules 2 are communicated with the second fluid channels 114 in the flow detecting modules 1 in a one-to-one correspondence manner.

The structure of the main control module 3 and the terminal module 4 will be further described below.

In an embodiment, referring to fig. 1 and 10, a plurality of flow detection modules 1 are disposed between a main control module 3 and a terminal module 4, and the connection manner of the main control module 3 and the adjacent flow detection modules 1 is the same as the connection manner of the adjacent two flow detection modules 1. The circuit board inside the main control module 3 is electrically connected with the expansion circuit board 19 of the adjacent flow detection module 1, and the terminal module 4 is electrically connected with the main control circuit board 18 of the adjacent flow detection module 1 and is fixed on the adjacent first main body part 11 through bolts and other components.

In addition, it should be noted that the first fluid passage 111 penetrates the first body portion 11 in the above embodiment for the convenience of mounting, dismounting, and replacement of the throttle plug 12. When the throttle plug 12 is installed inside the first fluid channel 111, a blocking member may be installed at an end of the first fluid channel 111 near the pressure regulating module 2 to block the first fluid channel 111, so as to prevent fluid leakage at an end of the first fluid channel 111 near the pressure regulating module 2.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments in terms of embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the embodiments may be combined appropriately to form other embodiments that can be understood by those skilled in the art.

Claims (13)

1. A fluid metering and filling device, characterized in that it comprises a flow detection module (1), said flow detection module (1) comprising:

A first body portion (11) including a first fluid passage (111), an upstream pressure collection passage (112) and a downstream pressure collection passage (113) in communication with the first fluid passage (111), respectively;

A throttle plug (12) screwed into the first fluid passage (111) and located between the upstream pressure collection passage (112) and the downstream pressure collection passage (113), the throttle plug (12) including a mounting hole (121) and an orifice (122) arranged along an axial direction thereof, the orifice (122) having a smaller aperture than the mounting hole (121), a shape of a perpendicular projection of the mounting hole (121) being polygonal on a plane perpendicular to the axial direction of the throttle plug (12);

an upstream pressure sensor (13) for detecting a fluid pressure within the upstream pressure acquisition channel (112);

A downstream pressure sensor (14) for detecting a fluid pressure within the downstream pressure acquisition channel (113).

2. A fluid metering and filling device as claimed in claim 1, wherein the orifice (122) is located on the side of the mounting bore (121) adjacent the downstream pressure collecting channel (113).

3. A fluid metering and filling device as claimed in claim 2, wherein the upstream end of the downstream pressure collecting channel (113) is located at a smaller distance from the throttle plug (12) than the downstream end thereof in the axial direction of the first fluid channel (111).

4. A fluid metering and filling device according to claim 1, wherein the upstream pressure sensor (13) and the downstream pressure sensor (14) are provided on the same surface of the first body portion (11);

The flow detection module (1) further comprises a sensor fixing piece (15) arranged on the first main body part (11), and the sensor fixing piece (15) comprises a limiting part (151) propped against one side of the upstream pressure sensor (13) and one side of the downstream pressure sensor (14) away from the first main body part (11).

5. The fluid metering and filling device according to claim 4, wherein a first limit groove (1511) and a second limit groove (1512) are formed on one side of the limit portion (151) facing the first main body portion (11), a partial region of the upstream pressure sensor (13) is accommodated in the first limit groove (1511), and a partial region of the downstream pressure sensor (14) is accommodated in the second limit groove (1512).

6. The fluid metering and filling device according to claim 1, wherein the first body portion (11) further comprises a temperature measuring channel (115) in communication with the first fluid channel (111), the flow detection module (1) further comprising a temperature sensor (16) provided within the temperature measuring channel (115) and an electrically controlled valve (17) provided on an outer surface of the first body portion (11), the electrically controlled valve (17) being in communication with an upstream end of the first fluid channel (111);

The flow detection module (1) further comprises a control unit which is electrically connected with the upstream pressure sensor (13), the downstream pressure sensor (14), the temperature sensor (16) and the electric control valve (17) at the same time, and the control unit is used for controlling the opening degree of the electric control valve (17) based on detection data of the upstream pressure sensor (13), the downstream pressure sensor (14) and the temperature sensor (16).

7. The fluid metering and filling device according to claim 1, characterized in that the flow detection module (1) further comprises an electrically controlled valve (17), the output end of the electrically controlled valve (17) being in communication with the upstream end of the first fluid channel (111);

The fluid metering and filling device further comprises a pressure regulating module (2) communicated with the input end of the electric control valve (17), and the pressure regulating module (2) is used for regulating the pressure of fluid conveyed into the first fluid channel (111).

8. The fluid metering and filling device according to claim 7, wherein the pressure regulating module (2) comprises a second main body part (21) and a pressure regulating valve (22) arranged on the second main body part (21), a pressure regulating input channel (211) communicated with an input end of the pressure regulating valve (22) and a pressure regulating output channel (212) communicated with an output end of the pressure regulating valve (22) are formed in the second main body part (21), and the pressure regulating output channel (212) is also communicated with an input end of the electric control valve (17).

9. The fluid metering and filling device according to claim 8, wherein a pressure measuring channel (213) which is communicated with the pressure regulating output channel (212) and penetrates to the outer surface of the second main body part (21) is formed in the second main body part (21);

In a pressure measuring state, the pressure measuring channel (213) is used for being connected with pressure testing equipment;

In the pressure-regulating state, a plug (214) is arranged in the pressure-measuring channel (213).

10. The fluid metering and filling device according to claim 6, further comprising a main control module (3) electrically connected to the control unit, wherein the main control module (3) is configured to set a target flow rate of the fluid in the first fluid channel (111) and send the target flow rate to the control unit.

11. A fluid metering and filling device according to claim 6, wherein the control unit comprises a main control circuit board (18) and an extension circuit board (19) arranged opposite each other in a direction perpendicular to the axial direction of the first fluid passage (111);

The flow detection modules (1) are provided with a plurality of flow detection modules and are distributed along the direction perpendicular to the main control circuit board (18) and the expansion circuit board (19), and the main control circuit board (18) of one of the two adjacent flow detection modules (1) is electrically connected with the expansion circuit board (19) of the other one of the two adjacent flow detection modules.

12. A fluid metering and filling device according to claim 11, wherein the first body portions (11) of adjacent two of the flow rate detection modules (1) are connected by means of a connecting rivet (5).

13. Fluid metering and filling device according to claim 10, characterized in that it further comprises a termination module (4) electrically connected to the control unit, the termination module (4) being adapted to provide a 120 Ω termination resistance.