CN104329838A - Refrigerant adjusting method and device and air conditioner - Google Patents
Refrigerant adjusting method and device and air conditioner Download PDFInfo
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- CN104329838A CN104329838A CN201410666072.XA CN201410666072A CN104329838A CN 104329838 A CN104329838 A CN 104329838A CN 201410666072 A CN201410666072 A CN 201410666072A CN 104329838 A CN104329838 A CN 104329838A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 385
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims description 43
- 229920006395 saturated elastomer Polymers 0.000 claims description 14
- 230000003434 inspiratory effect Effects 0.000 claims description 10
- 230000000704 physical effect Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 12
- 230000010412 perfusion Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- -1 moisture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a refrigerant adjusting method and device and an air conditioner. The method comprises the following steps: acquiring the current refrigerant mass flow; comparing the current refrigerant mass flow with the standard refrigerant mass flow; and adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow. According to the invention, by comparing the current refrigerant mass flow with the standard refrigerant mass flow, whether the refrigerant perfusion amount is proper or not can be automatically judged and automatically adjusted under the condition of a long connecting pipe, and additional refrigerant is not required to be added manually, so that the inconvenience of additionally adding the refrigerant in engineering installation and the additional cost increase possibly caused by adding the refrigerant are eliminated.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a refrigerant adjusting method and device and an air conditioner.
Background
The refrigerant filling amount of the air conditioner is generally determined through experiments under the condition of a standard connecting pipe required by an export country, and is filled according to the refrigerant filling amount before leaving a factory.
In practical situations, the connecting pipe used by the user is not a standard connecting pipe, but is generally a long connecting pipe, because of different installation occasions. In this case, it is common practice to add a refrigerant by increasing the length of the connecting pipe. This not only brings inconvenience to the engineering installation, increases the amount of work, and at the same time, additional cost increase may be brought by adding the refrigerant.
Disclosure of Invention
In view of the above technical problems, the present invention provides a refrigerant adjusting method, apparatus and air conditioner, which can automatically adjust the refrigerant filling amount, facilitate the operation and save the cost.
According to an aspect of the present invention, there is provided a refrigerant conditioning method, including: acquiring the current refrigerant mass flow; comparing the current refrigerant mass flow with the standard refrigerant mass flow; and adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow.
In an embodiment of the present invention, before the step of comparing the current refrigerant mass flow with the standard refrigerant mass flow, the method further includes: and inquiring the standard refrigerant mass flow of the air conditioner under the current working condition.
In one embodiment of the invention, the current operating condition comprises a current indoor ambient temperature and an outdoor ambient temperature.
In an embodiment of the present invention, the step of adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result between the current refrigerant mass flow and the standard refrigerant mass flow includes: if the mass flow of the current refrigerant is larger than the mass flow of the standard refrigerant, the mass flow of the refrigerant output by the refrigerant reservoir is reduced; and if the current refrigerant mass flow is smaller than the standard refrigerant mass flow, increasing the refrigerant mass flow output by the refrigerant reservoir.
In an embodiment of the present invention, the step of adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result between the current refrigerant mass flow and the standard refrigerant mass flow includes: and controlling the opening of a proportional valve of the refrigerant reservoir according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow so as to adjust the refrigerant mass flow output by the refrigerant reservoir.
In an embodiment of the present invention, the step of adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result between the current refrigerant mass flow and the standard refrigerant mass flow includes: according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow, opening a corresponding switch valve of the refrigerant liquid reservoir, and simultaneously closing other switch valves of the refrigerant liquid reservoir; the refrigerant reservoir comprises at least two switch valves, and the switch valves correspond to refrigerant amount of corresponding liquid level heights.
In an embodiment of the present invention, the switch valves include a first switch valve, a second switch valve, and a third switch valve, and the first switch valve, the second switch valve, and the third switch valve respectively correspond to the refrigerant amount of the high, medium, and low liquid level heights; according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow, the steps of opening the corresponding switch valve of the refrigerant liquid storage device and simultaneously closing other switch valves of the refrigerant liquid storage device comprise: if the current refrigerant mass flow is larger than the standard refrigerant mass flow, starting a first switch valve of a refrigerant reservoir, and closing a second switch valve and a third switch valve of the reservoir; if the current refrigerant mass flow is equal to the standard refrigerant mass flow, starting a second switch valve of the refrigerant reservoir, and closing a first switch valve and a third switch valve of the reservoir; and if the current refrigerant mass flow is smaller than the standard refrigerant mass flow, starting a third switch valve of the refrigerant reservoir, and closing the first switch valve and the second switch valve of the reservoir.
In an embodiment of the present invention, the step of obtaining the current refrigerant mass flow includes: obtainingSuction specific volume v of current compressorSuction device(ii) a According to the formula qm＝qV/νSuction deviceObtaining the current refrigerant mass flow qmWherein q isVIs the compressor volumetric flow rate.
In one embodiment of the invention, for a fixed frequency compressor, the compressor volume flow qVIs a constant value.
In one embodiment of the present invention, for an inverter compressor, according to the formula qV＝f×VpObtaining the volume flow q of the compressorVWherein f is the compressor operating frequency, VpIs the compressor displacement.
In one embodiment of the invention, the current compressor suction specific volume v is obtainedSuction deviceComprises the following steps: acquiring the temperature of an evaporator at a first U pipe of the indoor heat exchanger and the temperature at a suction port of a compressor; acquiring the saturation temperature at the air suction port of the compressor according to the temperature of the evaporator; acquiring saturation pressure at the air suction port of the compressor according to the saturation temperature at the air suction port of the compressor; inquiring a refrigerant physical property parameter table according to the temperature at the air suction port of the compressor and the saturation pressure at the air suction port of the compressor to obtain the current air suction specific volume v of the compressorSuction device。
According to another aspect of the present invention, there is provided a refrigerant adjusting apparatus, including a mass flow acquiring unit, a comparing unit, and an adjusting unit, wherein:
the mass flow acquiring unit is used for acquiring the mass flow of the current refrigerant and sending the mass flow of the current refrigerant to the comparing unit;
the comparison unit is used for comparing the current refrigerant mass flow with the standard refrigerant mass flow to obtain a comparison result and sending the comparison result to the adjusting unit;
and the adjusting unit is used for adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result sent by the comparing unit.
In one embodiment of the invention, the apparatus further comprises a query unit, wherein: and the query unit is used for querying the standard refrigerant mass flow of the air conditioner under the current working condition and sending the standard refrigerant mass flow to the comparison unit.
In one embodiment of the invention, the current operating condition comprises a current indoor ambient temperature and an outdoor ambient temperature.
In an embodiment of the present invention, the adjusting unit is specifically configured to reduce the refrigerant mass flow output by the refrigerant reservoir when the current refrigerant mass flow is greater than the standard refrigerant mass flow; and when the current refrigerant mass flow is smaller than the standard refrigerant mass flow, the refrigerant mass flow output by the refrigerant reservoir is increased.
In an embodiment of the invention, the adjusting unit is specifically configured to control an opening degree of a proportional valve of the refrigerant reservoir according to a comparison result between the current refrigerant mass flow and the standard refrigerant mass flow, so as to adjust the refrigerant mass flow output by the refrigerant reservoir.
In an embodiment of the present invention, the adjusting unit is specifically configured to open a corresponding switch valve of the refrigerant reservoir and close other switch valves of the refrigerant reservoir according to a comparison result between a current refrigerant mass flow and a standard refrigerant mass flow; the refrigerant reservoir comprises at least two switch valves, and the switch valves correspond to refrigerant amount of corresponding liquid level heights.
In an embodiment of the present invention, the switch valve includes a first switch valve, a second switch valve, and a third switch valve, wherein the first switch valve, the second switch valve, and the third switch valve respectively correspond to the refrigerant amount of the high, medium, and low liquid level heights; the adjusting unit is specifically used for starting a first switch valve of the refrigerant reservoir and closing a second switch valve and a third switch valve of the reservoir when the current refrigerant mass flow is greater than the standard refrigerant mass flow; when the current refrigerant mass flow is equal to the standard refrigerant mass flow, starting a second switch valve of the refrigerant reservoir, and closing a first switch valve and a third switch valve of the reservoir; and when the current refrigerant mass flow is smaller than the standard refrigerant mass flow, starting a third switch valve of the refrigerant reservoir, and closing the first switch valve and the second switch valve of the reservoir.
In one embodiment of the present invention, the mass flow rate obtaining unit includes an inspiratory specific volume obtaining module and a mass flow rate obtaining module, wherein: a suction specific volume obtaining module for obtaining the suction specific volume v of the current compressorSuction deviceAnd the current compressor suction specific volume vSuction deviceSending the data to a mass flow acquisition module; a mass flow acquisition module for obtaining the mass flow according to the formula qm＝qV/νSuction deviceObtaining the current refrigerant mass flow qmWherein q isVIs the compressor volumetric flow rate.
In one embodiment of the invention, for a fixed frequency compressor, the compressor volume flow qVIs a constant value.
In one embodiment of the invention, for an inverter compressor, the mass flow rate acquisition unit is specifically based on the formula qV＝f×VpObtaining the volume flow q of the compressorVWherein f is the compressor operating frequency, VpIs the compressor displacement.
In one embodiment of the present invention, the aspirated specific volume obtaining module includes a first temperature sensor, a second temperature sensor, a saturation temperature obtaining submodule, a saturation pressure obtaining submodule, and a query submodule, wherein: the first temperature sensor is used for acquiring the temperature of an evaporator at a first U pipe of the indoor heat exchanger and sending the temperature of the evaporator to the saturation temperature acquisition submodule; the second temperature sensor is used for acquiring the temperature at the air suction port of the compressor and sending the temperature at the air suction port to the query submodule; the saturated temperature acquisition submodule is used for acquiring the saturated temperature at the air suction port of the compressor according to the temperature of the evaporator and sending the saturated temperature to the saturated pressure acquisition submodule; the saturated pressure acquisition submodule is used for acquiring the saturated pressure at the air suction port of the compressor according to the saturated temperature at the air suction port of the compressor and sending the saturated pressure to the query submodule; query unitA module for inquiring the refrigerant physical property parameter table according to the temperature at the air suction port of the compressor and the saturation pressure at the air suction port of the compressor to obtain the air suction specific volume v of the current compressorSuction device。
According to another aspect of the present invention, an air conditioner is provided, which includes the refrigerant adjusting device described in any of the above embodiments.
The invention can realize the automatic adjustment of the refrigerant perfusion quantity by comparing the current refrigerant mass flow with the standard refrigerant mass flow without manually additionally adding the refrigerant, thereby eliminating the inconvenience of additionally adding the refrigerant in engineering installation and the additional cost increase possibly caused by additionally adding the refrigerant.
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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a refrigerant adjusting method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of obtaining a current refrigerant mass flow rate according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of obtaining a current compressor suction specific volume in one embodiment of the present invention.
Fig. 4 is a schematic view showing the installation of the switching valve and the temperature sensor in one embodiment of the present invention.
Fig. 5 is a schematic diagram of a refrigerant adjusting device according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a mass flow acquisition unit in an embodiment of the invention.
FIG. 7 is a schematic diagram of an inspiratory specific volume acquisition module according to an embodiment of the invention.
Fig. 8 is a schematic view of another embodiment of a refrigerant conditioning device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic diagram of a refrigerant adjusting method according to an embodiment of the present invention. Preferably, the present embodiment can be implemented by the refrigerant adjusting device of the present invention. The method comprises the following steps:
102, detecting the mass flow q of the current refrigerant after the air conditioner is installed and started and the system stably runsm。
104, judging the mass flow q of the current refrigerantmAnd comparing with the standard refrigerant mass flow Q.
106, according to the mass flow q of the current refrigerantmAnd regulating the refrigerant mass flow output by the refrigerant reservoir according to the comparison result with the standard refrigerant mass flow Q.
Based on the refrigerant adjusting method provided by the embodiment of the invention, whether the refrigerant perfusion amount is proper or not can be automatically judged and automatically adjusted under the condition of a long connecting pipe by comparing the current refrigerant mass flow with the standard refrigerant mass flow, and manual additional refrigerant addition is not needed, so that the inconvenience of additional refrigerant addition on engineering installation and the possible additional cost increase caused by additional refrigerant addition are eliminated.
In one embodiment of the present invention, as shown in fig. 2, step 102 in fig. 1 may include:
step 202, obtaining the suction specific volume v of the current compressorSuction device(unit is m)3/kg)。
Step 204, according to the formula qm＝qV/νSuction deviceObtaining the current refrigerant mass flow qm(in kg/s), wherein q isVIs the volume flow of the compressor, and has the unit of m3/s。
In one embodiment of the invention, for a fixed frequency compressor, the compressor volume flow qVIs a constant value.
In one embodiment of the present invention, for an inverter compressor, according to the formula qV＝f×VpObtaining the volume flow q of the compressorVWherein f is the running frequency of the compressor and is in Hz; vpIs the working volume of the compressor, and has a unit of m3。
In one embodiment of the present invention, as shown in fig. 3, step 102 in fig. 2 may include:
step 302, obtaining the evaporator temperature t at the first U tube of the indoor heat exchanger through the first temperature sensor arranged at the position A (namely, at the first U tube of the indoor heat exchanger in the cooling mode) and the second temperature sensor at the suction port of the compressor as shown in FIG. 4Evaporator with a heat exchangerAnd the temperature t at the compressor suctionSuction devicePreferably, the first temperature sensor and the second temperature sensor may adopt temperature sensing bulbs.
304, according to the evaporator temperature tEvaporator with a heat exchangerObtaining saturation temperature t 'at air suction port of compressor'Suction device。
In one embodiment, the first and second pairs may be tEvaporator with a heat exchangerTemperature compensation is carried out according to a formula t'Suction device＝tEvaporator with a heat exchanger+ delta t obtaining saturation temperature t 'at compressor suction port'Suction deviceWhere Δ t is the compensation temperature.
Step 306, according to the saturation temperature t 'at the air suction port of the compressor'Suction deviceObtaining the saturation pressure p at the air suction of the compressorSuction deviceWherein, saturation temperature t'Suction deviceAnd saturation pressure pSuction deviceAnd correspondingly.
308, according to the temperature t at the air suction port of the compressorSuction deviceAnd saturation pressure p at compressor suctionSuction deviceInquiring a refrigerant physical property parameter table to obtain the suction specific volume v of the current compressorSuction device。
According to the embodiment of the invention, the temperature sensors are additionally arranged at the air suction port of the compressor and the first U pipe of the indoor heat exchanger, so that the current refrigerant mass flow can be determined, the automatic adjustment of the refrigerant mass flow output by the refrigerant reservoir is realized, and the cost advantage is good; meanwhile, the control method is simple and easy to realize.
In an embodiment of the present invention, before step 104 shown in fig. 1, the method may further include: and inquiring the standard refrigerant mass flow of the air conditioner under the current working condition through the mass flow matrix table.
In one embodiment of the invention, the current operating condition comprises a current indoor ambient temperature tinAnd outdoor ambient temperature tout。
In one embodiment of the invention, the method further comprises the step of pre-determining the indoor and outdoor ambient temperatures tin、toutAnd formulating a mass flow matrix table. Wherein, as shown in the mass flow matrix table of table 1, the outdoor temperature is the abscissa, and the outdoor ambient temperature t is calculatedoutDividing into n regions: t is t1～t2Is the 1 st region, t2～t3Is the 2 nd region, t3～t4Is the 3 rd region, … …, tn～tn+1Is the nth area; the indoor temperature is taken as the ordinate, and the indoor environment temperature t is taken asinDivision into m regions: t'1～t′2Is the 1 st region, t'2～t′3Is the 2 nd region, t'3～t′4Is the 3 rd region, … …, t'm～t′m+1Is the m-th area; as shown in the following table, the corresponding normal refrigerant mass flow Q of the system can be obtained by combining the current indoor and outdoor ambient temperatures.
TABLE 1
In one embodiment of the present invention, step 106 shown in FIG. 1 may comprise: if the mass flow of the current refrigerant is larger than the mass flow of the standard refrigerant, the mass flow of the refrigerant output by the refrigerant reservoir is reduced; and if the current refrigerant mass flow is smaller than the standard refrigerant mass flow, increasing the refrigerant mass flow output by the refrigerant reservoir.
In one embodiment of the present invention, step 106 shown in FIG. 1 may comprise: according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow, the opening degree of a proportional valve is controlled by controlling the magnitude of a level signal output to the refrigerant liquid storage device, so that the purpose of adjusting the refrigerant mass flow output by the refrigerant liquid storage device is achieved, wherein the proportional valve is arranged between an output port of the refrigerant liquid storage device and a refrigerant transmission pipeline.
In one embodiment of the present invention, step 106 as shown in FIG. 1 may include: according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow, opening a corresponding switch valve of the refrigerant liquid reservoir, and simultaneously closing other switch valves of the refrigerant liquid reservoir; the refrigerant reservoir comprises at least two switch valves, each switch valve corresponds to the refrigerant quantity of the corresponding liquid level height, and each switch valve is arranged between the output port of the corresponding liquid level height of the refrigerant reservoir and the refrigerant transmission pipeline.
Preferably, in an embodiment of the present invention, step 106 shown in fig. 1 may include: and according to different ranges of the difference value between the current refrigerant mass flow and the standard refrigerant mass flow, opening a corresponding switch valve of the refrigerant liquid reservoir, and simultaneously closing other switch valves of the refrigerant liquid reservoir.
In an embodiment of the present invention, as shown in fig. 4, the outlet of the refrigerant reservoir is provided with a first switch valve (electric switch valve 1), a second switch valve (electric switch valve 2), and a third switch valve (electric switch valve 3), which correspond to refrigerant quantities of different liquid levels. Wherein the electric switch valves 1, 2, 3 correspond to the refrigerant amount of high, medium and low liquid level respectively, and also correspond to the length L of the connecting pipe respectively1、L2、L3The unit m.
In the embodiment shown in fig. 4, the installation and the opening are completedAfter the machine, the system firstly defaults to open the electric switch valve 2 (the electric switch valves 1 and 3 are closed); detecting the mass flow value q of the refrigerant at the moment after the system operates stablymThe mass flow matrix table is used to look up the normal refrigerant mass flow Q of the system set under the working condition, and Q is comparedmAnd Q:
if q ismIf the refrigerant filling quantity of the system is larger than Q, the system closes the electric switch valve 2 and starts the electric switch valve 1 (the electric switch valve 3 is kept closed) at the same time;
if q ismQ, the filling quantity of the system refrigerant is small at the moment, the system closes the electric switch valve 2 at the moment, and simultaneously starts the electric switch valve 3 (the electric switch valve 1 is kept closed);
if q ismAt this time, the system coolant filling amount is appropriate, and at this time, the system does not need to switch the electric switching solenoid valve (that is, the electric switching valve 2 is kept open, and the electric switching valves 1 and 3 are kept closed).
Compared with the conventional air-conditioning system, the embodiment of the invention only adds three electric switch valves on the liquid storage device, and adds the temperature sensing bulb at the air suction port of the compressor and the first U pipe of the indoor heat exchanger, so that the air-conditioning system can select proper refrigerant filling quantity according to the actual length of the connecting pipe of a user, the purpose that the long connecting pipe does not need to be added with refrigerant manually is achieved, the inconvenience of additionally adding refrigerant on engineering installation is eliminated, and the additional cost possibly brought by adding refrigerant is increased; meanwhile, the method has the advantages of good cost advantage, simple control method and easy realization.
Fig. 5 is a schematic diagram of a refrigerant adjusting device according to an embodiment of the invention. As shown in fig. 5, the refrigerant adjusting device includes a mass flow obtaining unit 502, a comparing unit 504, and an adjusting unit 506, wherein:
the mass flow obtaining unit 502 is configured to obtain a current refrigerant mass flow after the air conditioner is installed and started and after the system stably operates, and send the current refrigerant mass flow to the comparing unit 504.
The comparing unit 504 is configured to compare the current refrigerant mass flow with the standard refrigerant mass flow, obtain a comparison result, and send the comparison result to the adjusting unit 506.
And an adjusting unit 506, configured to adjust a refrigerant mass flow output by the refrigerant reservoir according to the comparison result sent by the comparing unit 504.
Based on the refrigerant adjusting device provided by the above embodiment of the invention, by comparing the current refrigerant mass flow with the standard refrigerant mass flow, whether the refrigerant perfusion amount is proper or not can be automatically judged and adjusted under the condition of a long connecting pipe, and additional refrigerant is not required to be added manually, so that the inconvenience of additionally adding the refrigerant in engineering installation and the additional cost increase possibly caused by adding the refrigerant are eliminated.
In one embodiment of the present invention, the mass flow rate acquisition unit 502 may be a mass flow rate sensor.
Fig. 6 is a schematic diagram of a mass flow acquisition unit in an embodiment of the invention. As shown in fig. 6, the mass flow rate obtaining unit 502 in fig. 5 may include an inspiratory specific volume obtaining module 602 and a mass flow rate obtaining module 604, wherein:
an inspiratory specific volume obtaining module 602, configured to obtain an inspiratory specific volume v of the current compressorSuction device(unit is m)3/kg) and the current compressor suction specific volume vSuction deviceTo the mass flow acquisition module 604.
A mass flow obtaining module 604 for obtaining the mass flow according to the formula qm＝qV/νSuction deviceObtaining the current refrigerant mass flow qm(in kg/s), wherein q isVIs the volume flow of the compressor, and has the unit of m3/s。
In one embodiment of the invention, for a fixed frequency compressor, the compressor volume flow qVIs a constant value.
In one embodiment of the present invention, the mass flow rate obtaining unit 502 is embodied for an inverter compressorAccording to the formula qV＝f×VpObtaining the volume flow q of the compressorVWherein f is the running frequency of the compressor and is in Hz; vpIs the working volume of the compressor, and has a unit of m3。
FIG. 7 is a schematic diagram of an inspiratory specific volume acquisition module according to an embodiment of the invention. As shown in FIG. 7, the inspiratory specific volume acquisition module 602 of FIG. 6 may include a first temperature sensor 702, a second temperature sensor 704, a saturation temperature acquisition submodule 706, a saturation pressure acquisition submodule 708, and a query submodule 710, wherein:
a first temperature sensor 702 for obtaining the evaporator temperature t at the first U-tube of the indoor heat exchangerEvaporator with a heat exchangerAnd setting the evaporator temperature tEvaporator with a heat exchangerTo the saturation temperature acquisition sub-module 706.
Preferably, as shown in fig. 4, the first temperature sensor 702 is a thermal bulb disposed at a position a (i.e., at the first U tube of the indoor heat exchanger in the cooling mode).
A second temperature sensor 704 for obtaining the temperature t at the compressor suctionSuction deviceAnd the temperature t at the air suction port is measuredSuction deviceAnd sent to the query submodule 710.
Preferably, as shown in fig. 4, the second temperature sensor 704 is a bulb disposed at the compressor suction port.
A saturation temperature obtaining sub-module 706 for obtaining the temperature t of the evaporator according to the temperature tEvaporator with a heat exchangerObtaining saturation temperature t 'at air suction port of compressor'Suction deviceAnd the saturation temperature t'Suction deviceTo the saturation pressure acquisition submodule 708.
In one embodiment, the saturation temperature acquisition submodule 706 is specifically configured to obtain the saturation temperature by pairing tEvaporator with a heat exchangerTemperature compensation is carried out according to a formula t'Suction device＝tEvaporator with a heat exchanger+ delta t obtaining saturation temperature t 'at compressor suction port'Suction deviceWhere Δ t is the compensation temperature.
A saturated pressure obtaining submodule 708 for obtaining a saturated temperature t 'at the compressor suction port'Suction deviceObtaining the saturation pressure p at the air suction of the compressorSuction deviceWherein, saturation temperature t'Suction deviceAnd saturation pressure pSuction deviceCorresponding; and sends the saturation pressure to the query submodule 710.
An enquiry submodule 710 for determining a temperature t at the compressor suctionSuction deviceAnd saturation pressure p at compressor suctionSuction deviceInquiring a refrigerant physical property parameter table to obtain the suction specific volume v of the current compressorSuction device。
According to the embodiment of the invention, the temperature sensing bulb is additionally arranged at the air suction port of the compressor and the first U pipe of the indoor heat exchanger, so that the current refrigerant mass flow can be determined, the refrigerant mass flow output by the refrigerant reservoir can be automatically adjusted, and compared with a scheme of measuring the refrigerant mass flow by a mass flow sensor, the method has a good cost advantage; meanwhile, the control method is simple and easy to realize.
Fig. 8 is a schematic view of another embodiment of a refrigerant conditioning device according to the present invention. Compared to the embodiment shown in fig. 5, in the embodiment shown in fig. 8, the apparatus further includes a query unit 802, where:
the query unit 802 is configured to query the standard refrigerant mass flow rate of the air conditioner under the current working condition through a mass flow rate matrix table shown in table 1, which is prepared in advance, and send the standard refrigerant mass flow rate to the comparison unit 504.
In one embodiment of the invention, the current operating condition comprises a current indoor ambient temperature and an outdoor ambient temperature.
In an embodiment of the present invention, the adjusting unit 506 in the embodiment shown in fig. 5 is specifically configured to reduce the refrigerant mass flow output by the refrigerant reservoir when the current refrigerant mass flow is greater than the standard refrigerant mass flow; and when the current refrigerant mass flow is smaller than the standard refrigerant mass flow, the refrigerant mass flow output by the refrigerant reservoir is increased.
In an embodiment of the present invention, the adjusting unit 506 in the embodiment shown in fig. 5 is specifically configured to control an opening degree of a proportional valve output to a refrigerant reservoir by controlling a magnitude of a level signal output to the refrigerant reservoir according to a comparison result between a current refrigerant mass flow and a standard refrigerant mass flow, so as to achieve an objective of adjusting the refrigerant mass flow output by the refrigerant reservoir, where the proportional valve is disposed between an output port of the refrigerant reservoir and a refrigerant transmission pipeline.
In an embodiment of the present invention, the adjusting unit 506 in the embodiment shown in fig. 5 is specifically configured to open a corresponding switch valve of the refrigerant reservoir and close other switch valves of the refrigerant reservoir according to a comparison result between a current refrigerant mass flow and a standard refrigerant mass flow; the refrigerant reservoir comprises at least two switch valves, each switch valve corresponds to the refrigerant amount of the corresponding liquid level height, and each switch valve is arranged between an output port of the corresponding liquid level height of the refrigerant reservoir and a refrigerant transmission pipeline.
In an embodiment of the present invention, the adjusting unit 506 in the embodiment shown in fig. 5 may be configured to open the corresponding switch valve of the refrigerant accumulator and close the other switch valves of the refrigerant accumulator according to different ranges of the difference between the current refrigerant mass flow and the standard refrigerant mass flow.
In an embodiment of the present invention, as shown in fig. 4, the outlet of the refrigerant reservoir is provided with a first switch valve (electric switch valve 1), a second switch valve (electric switch valve 2), and a third switch valve (electric switch valve 3), which correspond to refrigerant quantities of different liquid levels. Wherein the electric switch valves 1, 2, 3 correspond to the refrigerant amount of high, medium and low liquid level respectively, and also correspond to the length L of the connecting pipe respectively1、L2、L3The unit m.
In the embodiment shown in fig. 4, after the installation and the startup are completed, the system first defaults to open the electric switch valve 2 (the electric switch valves 1 and 3 are closed). The mass flow rate obtaining unit 502 detects the cold medium after the system is stably operatedFlow rate value qm(ii) a The query unit 802 looks up the mass flow matrix table to obtain the system normal refrigerant mass flow Q set under the working condition; comparison unit 504 compares qmAnd Q:
the adjusting unit 506 is specifically configured to close the electric switch valve 2 and start the electric switch valve 1 (the electric switch valve 3 remains closed) when the current refrigerant mass flow is greater than the standard refrigerant mass flow (which indicates that the refrigerant filling amount of the air conditioning system is excessive at this time).
The adjusting unit 506 is further configured to, when the current refrigerant mass flow rate is equal to the standard refrigerant mass flow rate (which indicates that the refrigerant filling amount of the system is appropriate), the system does not need to switch the electric switch solenoid valve (i.e., the electric switch valve 2 is kept open, and the electric switch valves 1 and 3 are kept closed).
The adjusting unit 506 is further configured to, when the current refrigerant mass flow is smaller than the standard refrigerant mass flow (which indicates that the refrigerant filling amount of the system is relatively small at this time), close the electric switch valve 2 by the system, and simultaneously start the electric switch valve 3 (the electric switch valve 1 is kept closed).
Compared with the conventional air-conditioning system, the embodiment of the invention only adds three electric switch valves on the liquid storage device, and adds the temperature sensing bulb at the air suction port of the compressor and the first U pipe of the indoor heat exchanger, so that the air-conditioning system can select proper refrigerant filling quantity according to the actual length of the connecting pipe of a user, the purpose that the long connecting pipe does not need to be added with refrigerant manually is achieved, the inconvenience of additionally adding refrigerant on engineering installation is eliminated, and the additional cost possibly brought by adding refrigerant is increased; meanwhile, the method has the advantages of good cost advantage, simple control method and easy realization.
According to another aspect of the present invention, an air conditioner is provided, which includes the refrigerant adjusting device described in any of the above embodiments, in addition to an outdoor heat exchanger, an indoor heat exchanger, a refrigerant reservoir, and a compressor.
Based on the air conditioner provided by the embodiment of the invention, by comparing the current refrigerant mass flow with the standard refrigerant mass flow, whether the refrigerant perfusion amount is proper or not can be automatically judged and automatically adjusted under the condition of a long connecting pipe, and the additional refrigerant is not required to be added manually, so that the inconvenience of additionally adding the refrigerant in engineering installation and the additional cost increase possibly caused by adding the refrigerant are eliminated.
In one embodiment of the present invention, as shown in fig. 4, the air conditioner may further include a gas-liquid separator, wherein:
the gas-liquid separator is arranged between the air suction port of the compressor and the heat exchanger of the indoor unit to prevent the air suction port of the compressor from sucking liquid refrigerant, so that the acquisition precision of the mass flow acquisition unit in the refrigerant adjusting device can be further improved, and the adjustment precision of the refrigerant adjusting device can be further improved.
In one embodiment of the present invention, as shown in fig. 4, the air conditioner may further include an oil separator, wherein:
the oil separator is arranged between the outlet of the compressor and the heat exchanger of the outdoor unit to filter oil particles mixed in the refrigerant, so that the acquisition precision of the mass flow acquisition unit in the refrigerant adjusting device can be further improved, and the adjustment precision of the refrigerant adjusting device can be further improved.
In an embodiment of the present invention, as shown in fig. 4, the air conditioner may further include a first filter, wherein:
the first filter is arranged between the air suction port of the compressor and the gas-liquid separator to filter impurities mixed in the gaseous refrigerant, so that the acquisition precision of the mass flow acquisition unit in the refrigerant adjusting device can be further improved, and the adjustment precision of the refrigerant adjusting device can be further improved.
In an embodiment of the present invention, as shown in fig. 4, the air conditioner may further include a second filter and a third filter, wherein:
the second filter and the third filter are arranged in front of and behind the throttling device and used for filtering impurities such as moisture, solid powder and dirt generated in the refrigerant, so that the throttling hole of the throttling device is prevented from being dirty and blocked; meanwhile, the acquisition precision of the mass flow acquisition unit in the refrigerant adjusting device can be further improved, and the adjusting precision of the refrigerant adjusting device can be further improved.
In one embodiment of the present invention, as shown in fig. 4, the air conditioner may further include a silencer, wherein: the silencer is arranged between the outlet of the compressor and the oil separator to eliminate the noise of the compressor.
In an embodiment of the present invention, as shown in fig. 4, the air conditioner may further include a throttling device, wherein:
the throttling device is arranged on a connecting pipeline between the refrigerant liquid storage device and the indoor heat exchanger, and plays a role in reducing the temperature and pressure of the refrigerant output by the high-pressure liquid storage tank.
In one embodiment of the invention, the throttling device is a throttle valve or an expansion valve.
The functional units described above, such as the comparison unit 504, the specific inspiratory volume acquisition module 602, the mass flow acquisition module 604, the saturation temperature acquisition submodule 706, the saturation pressure acquisition submodule 708 and the query submodule 710, the query unit 802, etc., may be implemented as a general purpose processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any suitable combination thereof, for performing the functions described herein.
Thus far, the present invention has been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (21)
1. A refrigerant conditioning method, comprising:
acquiring the current refrigerant mass flow;
comparing the current refrigerant mass flow with the standard refrigerant mass flow;
and adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow.
2. The method of claim 1, further comprising, prior to the step of comparing the current refrigerant mass flow rate to the standard refrigerant mass flow rate:
and inquiring the standard refrigerant mass flow of the air conditioner under the current working condition.
3. The method of claim 2,
the current operating conditions include a current indoor ambient temperature and an outdoor ambient temperature.
4. The method of claim 1, wherein the step of adjusting the refrigerant mass flow output by the refrigerant reservoir based on the comparison of the current refrigerant mass flow to the standard refrigerant mass flow comprises:
if the mass flow of the current refrigerant is larger than the mass flow of the standard refrigerant, the mass flow of the refrigerant output by the refrigerant reservoir is reduced;
and if the current refrigerant mass flow is smaller than the standard refrigerant mass flow, increasing the refrigerant mass flow output by the refrigerant reservoir.
5. The method of claim 4, wherein the step of adjusting the refrigerant mass flow output by the refrigerant reservoir based on the comparison of the current refrigerant mass flow to the standard refrigerant mass flow comprises:
and controlling the opening of a proportional valve of the refrigerant reservoir according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow so as to adjust the refrigerant mass flow output by the refrigerant reservoir.
6. The method of claim 4, wherein the step of adjusting the refrigerant mass flow output by the refrigerant reservoir based on the comparison of the current refrigerant mass flow to the standard refrigerant mass flow comprises:
according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow, opening a corresponding switch valve of the refrigerant liquid reservoir, and simultaneously closing other switch valves of the refrigerant liquid reservoir; the refrigerant reservoir comprises at least two switch valves, and the switch valves correspond to refrigerant amount of corresponding liquid level heights.
7. The method as claimed in claim 6, wherein the switch valve comprises a first switch valve, a second switch valve and a third switch valve, and the first switch valve, the second switch valve and the third switch valve respectively correspond to the refrigerant amount of the high liquid level, the medium liquid level and the low liquid level;
according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow, the steps of opening the corresponding switch valve of the refrigerant liquid storage device and simultaneously closing other switch valves of the refrigerant liquid storage device comprise:
if the current refrigerant mass flow is larger than the standard refrigerant mass flow, starting a first switch valve of a refrigerant reservoir, and closing a second switch valve and a third switch valve of the reservoir;
if the current refrigerant mass flow is equal to the standard refrigerant mass flow, starting a second switch valve of the refrigerant reservoir, and closing a first switch valve and a third switch valve of the reservoir;
and if the current refrigerant mass flow is smaller than the standard refrigerant mass flow, starting a third switch valve of the refrigerant reservoir, and closing the first switch valve and the second switch valve of the reservoir.
8. The method according to any one of claims 1 to 7, wherein the step of obtaining the current refrigerant mass flow rate comprises:
obtaining the suction specific volume v of the current compressorSuction device；
According to the formula qm＝qV/νSuction deviceObtaining the current refrigerant mass flow qmWherein q isVIs the compressor volumetric flow rate.
9. The method of claim 8,
for a fixed frequency compressor, the compressor volume flow qVIs a constant value;
or,
for inverter compressors, according to the formula qV＝f×VpObtaining the volume flow q of the compressorVWherein f is the compressor operating frequency, VpIs the compressor displacement.
10. The method of claim 8 wherein obtaining a current compressor suction specific volume νSuction deviceComprises the following steps:
acquiring the temperature of an evaporator at a first U pipe of the indoor heat exchanger and the temperature at a suction port of a compressor;
acquiring the saturation temperature at the air suction port of the compressor according to the temperature of the evaporator;
acquiring saturation pressure at the air suction port of the compressor according to the saturation temperature at the air suction port of the compressor;
inquiring a refrigerant physical property parameter table according to the temperature at the air suction port of the compressor and the saturation pressure at the air suction port of the compressor to obtain the current air suction specific volume v of the compressorSuction device。
11. A refrigerant regulating device, comprising a mass flow rate obtaining unit (502), a comparing unit (504) and a regulating unit (506), wherein:
the mass flow acquiring unit (502) is used for acquiring the mass flow of the current refrigerant and sending the mass flow of the current refrigerant to the comparing unit (504);
the comparison unit (504) is used for comparing the current refrigerant mass flow with the standard refrigerant mass flow to obtain a comparison result and sending the comparison result to the regulation unit (506);
and the adjusting unit (506) is used for adjusting the refrigerant mass flow output by the refrigerant reservoir according to the comparison result sent by the comparing unit (504).
12. The apparatus according to claim 11, further comprising a query unit (802), wherein:
and the query unit (802) is used for querying the standard refrigerant mass flow of the air conditioner under the current working condition and sending the standard refrigerant mass flow to the comparison unit (504).
13. The apparatus of claim 12,
the current operating conditions include a current indoor ambient temperature and an outdoor ambient temperature.
14. The apparatus of claim 11,
the adjusting unit (506) is specifically used for reducing the refrigerant mass flow output by the refrigerant reservoir when the current refrigerant mass flow is greater than the standard refrigerant mass flow; and when the current refrigerant mass flow is smaller than the standard refrigerant mass flow, the refrigerant mass flow output by the refrigerant reservoir is increased.
15. The apparatus of claim 14,
the adjusting unit (506) is specifically configured to control an opening degree of a proportional valve of the refrigerant reservoir according to a comparison result between the current refrigerant mass flow and the standard refrigerant mass flow, so as to adjust the refrigerant mass flow output by the refrigerant reservoir.
16. The apparatus of claim 14,
the adjusting unit (506) is specifically used for opening a corresponding switch valve of the refrigerant reservoir and closing other switch valves of the refrigerant reservoir at the same time according to the comparison result of the current refrigerant mass flow and the standard refrigerant mass flow; the refrigerant reservoir comprises at least two switch valves, and the switch valves correspond to refrigerant amount of corresponding liquid level heights.
17. The apparatus of claim 16,
the switch valves comprise a first switch valve, a second switch valve and a third switch valve, wherein the first switch valve, the second switch valve and the third switch valve respectively correspond to the refrigerant amount of the high liquid level, the medium liquid level and the low liquid level;
the adjusting unit (506) is specifically used for starting a first switch valve of the refrigerant reservoir and closing a second switch valve and a third switch valve of the reservoir when the current refrigerant mass flow is greater than the standard refrigerant mass flow; when the current refrigerant mass flow is equal to the standard refrigerant mass flow, starting a second switch valve of the refrigerant reservoir, and closing a first switch valve and a third switch valve of the reservoir; and when the current refrigerant mass flow is smaller than the standard refrigerant mass flow, starting a third switch valve of the refrigerant reservoir, and closing the first switch valve and the second switch valve of the reservoir.
18. The apparatus according to any one of claims 11-17, wherein the mass flow rate obtaining unit (502) comprises an inspiratory specific volume obtaining module (602) and a mass flow rate obtaining module (604), wherein:
a suction specific volume obtaining module (602) for obtaining the suction specific volume v of the current compressorSuction deviceAnd the current compressor suction specific volume vSuction deviceSending the data to a mass flow acquisition module (604);
a mass flow acquisition module (604) for obtaining a mass flow according to the formula qm＝qV/νSuction deviceObtaining the current refrigerant mass flow qmWherein q isVIs the compressor volumetric flow rate.
19. The apparatus of claim 18,
for a fixed frequency compressor, the compressor volume flow qVIs a constant value;
or,
for variable frequency compressors, the mass flow acquisition unit (502) is specifically based on the formula qV＝f×VpObtaining the volume flow q of the compressorVWherein f is the compressor operating frequency, VpIs the compressor displacement.
20. The apparatus of claim 18, wherein the inspiratory specific volume acquisition module (602) comprises a first temperature sensor (702), a second temperature sensor (704), a saturation temperature acquisition submodule (706), a saturation pressure acquisition submodule (708), and a query submodule (710), wherein:
the first temperature sensor (702) is used for acquiring the temperature of an evaporator at a first U pipe of the indoor heat exchanger and sending the temperature of the evaporator to the saturation temperature acquisition submodule (706);
a second temperature sensor (704) for acquiring a temperature at a compressor suction port and sending the temperature at the suction port to an inquiry submodule (710);
the saturation temperature acquisition submodule (706) is used for acquiring the saturation temperature at the air suction port of the compressor according to the evaporator temperature and sending the saturation temperature to the saturation pressure acquisition submodule (708);
the saturated pressure obtaining submodule (708) is used for obtaining the saturated pressure at the air suction port of the compressor according to the saturated temperature at the air suction port of the compressor and sending the saturated pressure to the query submodule (710);
the query submodule (710) is used for querying the refrigerant physical property parameter table according to the temperature at the air suction port of the compressor and the saturation pressure at the air suction port of the compressor to obtain the current air suction specific volume ν of the compressorSuction device。
21. An air conditioner characterized by comprising the refrigerant adjusting device as claimed in any one of claims 11 to 20.
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