CN111637580B - Method for controlling refrigerating capacity of air conditioner and air conditioner - Google Patents
Method for controlling refrigerating capacity of air conditioner and air conditioner Download PDFInfo
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- CN111637580B CN111637580B CN202010352325.1A CN202010352325A CN111637580B CN 111637580 B CN111637580 B CN 111637580B CN 202010352325 A CN202010352325 A CN 202010352325A CN 111637580 B CN111637580 B CN 111637580B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention discloses a device and a method for controlling the refrigerating capacity of an air conditioner and the air conditioner, wherein the device comprises an indoor unit and an outdoor unit, the indoor unit comprises an evaporator, the outdoor unit comprises a compressor, the outlet of the evaporator is connected with the air suction port of the compressor through a main pipeline, the air conditioner also comprises a liquid storage device, the liquid storage device comprises a liquid storage device inlet and a liquid storage device outlet, the liquid storage device inlet is connected with the main pipeline through a first pipeline, and the liquid storage device outlet is connected with the main pipeline through a second pipeline; the first pipeline is provided with a first expansion valve; the second pipeline is provided with a second expansion valve. According to the device and the method for controlling the refrigerating capacity of the air conditioner and the air conditioner, the amount of the refrigerant in the air conditioning system can be adjusted in real time according to the operation load when the air conditioner operates, so that the refrigerating capacity of the air conditioner is adjusted, the refrigerating effect is improved, and the comfort of a user is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a device and a method for controlling the refrigerating capacity of an air conditioner and the air conditioner.
Background
With the development of science and technology, air conditioners have come into thousands of households, and the gradual transition of user demands from being able to cool is pursued into a more comfortable experience, such as precisely controlling the cooling capacity.
At present, the main method for controlling the refrigerating capacity of an air conditioner manufacturer comprises the following steps: adjusting the running frequency of the compressor, the throttling device or the rotating speed of the fan. However, in the case of the fixed-frequency air conditioner, the operating frequency of the compressor is fixed and cannot be adjusted. For an air conditioning system adopting a capillary tube, the pressure before and after throttling is fixed, and real-time adjustment cannot be realized. And the adjustment of the rotating speed of the fan can cause the noise rise when the air conditioner operates, and the comfort is influenced. Therefore, there is a need for an improvement of the existing method of controlling the cooling capacity of the air conditioner.
Disclosure of Invention
The invention aims to provide a device and a method for controlling the refrigerating capacity of an air conditioner and the air conditioner, and aims to solve the technical problems that the refrigerating capacity cannot be controllably adjusted in real time and the user experience is poor in the conventional air conditioning system.
In order to achieve the purpose, the invention adopts the following technical scheme,
a device for controlling the refrigerating capacity of an air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an evaporator, the outdoor unit comprises a compressor, an outlet of the evaporator is connected with an air suction port of the compressor through a main pipeline, the device also comprises a liquid storage device, the liquid storage device comprises a liquid storage device inlet and a liquid storage device outlet, the liquid storage device inlet is connected with the main pipeline through a first pipeline, and the liquid storage device outlet is connected with the main pipeline through a second pipeline; the first pipeline is provided with a first expansion valve; the second pipeline is provided with a second expansion valve.
The device for controlling the refrigerating capacity of the air conditioner is provided with the liquid storage device which is connected with the main pipeline and is used for recovering or supplying the refrigerant, so that the refrigerant quantity in an air conditioning system can be adjusted in real time according to the operation load when the air conditioner operates, the refrigerating capacity of the air conditioner is adjusted, the refrigerating effect is improved, and the comfort of a user is improved.
Further, a first one-way valve is arranged on the first pipeline and used for controlling the first pipeline to be communicated with the inlet of the liquid storage device in a one-way mode from the main pipeline; and/or a second one-way valve is further arranged on the second pipeline and used for controlling the second pipeline to be communicated from the outlet of the liquid storage device to the main pipeline in a one-way mode.
According to the technical scheme of this embodiment, set up first check valve and second check valve, can effectively prevent refrigerant backward flow in first pipeline and the second pipeline, improve the reliability that the reservoir was retrieved or was supplied the refrigerant.
Further, a first inner disc temperature sensing bag is installed at the inlet of the evaporator; a second inner-disc temperature sensing bulb is installed at the outlet of the evaporator; an air outlet of the indoor unit is provided with an air outlet temperature sensing bulb; and/or the air suction port of the compressor is respectively provided with an air suction pressure valve and an air suction temperature sensing bulb; and/or an environment temperature sensing bulb is arranged on the indoor unit.
According to the technical scheme of the embodiment, the first inner disc temperature sensing bulb is used for detecting the inlet temperature of the evaporator, the second inner disc temperature sensing bulb is used for detecting the outlet temperature of the evaporator, the air outlet temperature sensing bulb is used for detecting the air outlet temperature of the indoor unit, the environment temperature sensing bulb is used for detecting the environment temperature of the indoor unit, the suction pressure valve is used for detecting the suction pressure of the compressor, and the suction temperature sensing bulb is used for detecting the suction temperature of the compressor.
The invention also provides a method for controlling the refrigerating capacity of the air conditioner, which is used for any device for controlling the refrigerating capacity of the air conditioner, and comprises the following steps:
detecting evaporator inlet temperature TDish temperature 1Evaporator outlet temperature TDish temperature 2Air outlet temperature T of indoor unitAir outletThe ambient temperature T of the indoor unitRing (C)And the suction temperature T of the compressorAir suctionAnd suction pressure P;
obtaining the heat exchange degree delta T of the evaporatorEvaporation ofAnd degree of superheat Δ T of suction gas of compressorSuperheating；
Judging whether the condition 1 is met: if the condition 1 is met, controlling the first expansion valve to be kept closed, opening the second expansion valve until the condition 1 is not met, and closing the second expansion valve;
wherein condition 1 is: delta TEvaporation of＞K1And T isAir outlet＞K2。
According to the method for controlling the refrigerating capacity of the air conditioner, when the condition 1 is met, the refrigerant quantity of an air conditioning system is too small, so that the temperature of an evaporator is easily low, and condensed water is generated; the second expansion valve is opened, so that the refrigerant in the liquid reservoir flows into the main pipeline, the circulating refrigerant quantity of the air conditioning system can be increased, the low pressure of the air conditioning system is improved, and the problem of condensation and water leakage of the air conditioner is prevented.
Further, the method also comprises the following steps:
if the condition 1 is not met, judging whether the condition 2 is met: if the condition 2 is met, controlling the second expansion valve to be kept closed, opening the first expansion valve until the condition 2 is not met, and closing the first expansion valve;
wherein condition 2 is: delta TSuperheating＜K3。
According to the technical scheme of the embodiment, when the condition 2 is met, the refrigerant quantity of the air-conditioning system is too much, the liquid refrigerant in the evaporator is not completely evaporated, the return air temperature is too low, and part of the unevaporated liquid refrigerant can be sucked into the compressor, so that the liquid impact of the compressor is caused, and the service life of the compressor is influenced; the first expansion valve is opened, so that the refrigerant in the air-conditioning system flows into the liquid storage device, the refrigerant circulation quantity of the air-conditioning system is reduced, the suction superheat degree is improved, and the problem of liquid impact of the compressor of the air conditioner is prevented.
Further, the method also comprises the following steps:
if the condition 2 is not met, judging whether the condition 3 is met:
if the condition 3 is met, controlling the first expansion valve to be kept closed, opening the second expansion valve until the condition 3 is not met, and closing the second expansion valve;
if the condition 3 is not met, controlling the second expansion valve to be kept closed, opening the first expansion valve until the condition 3 is not met, and closing the first expansion valve;
wherein condition 3 is: t isRing (C)-TIs provided with＞K，TIs provided withThe temperature is set for the user.
According to the technical scheme of the embodiment, when the difference between the ambient temperature and the temperature set by the user is large, the second expansion valve is opened, so that the refrigerant in the liquid storage device flows into the air conditioning system, the circulating refrigerant quantity of the air conditioning system is increased, and the refrigerating capacity is improved; when the difference between the ambient temperature and the temperature set by the user is small, the first expansion valve is opened, so that the refrigerant in the air-conditioning system flows into the liquid storage device, the circulating refrigerant quantity of the air-conditioning system is reduced, the refrigerating capacity is reduced, and the energy is saved.
Further, the heat exchange degree delta T of the evaporatorEvaporation ofThe calculation formula of (2) is as follows:
ΔTevaporation of＝TDish temperature 2-TDish temperature 1。
Further, obtaining the suction superheat degree of the compressor comprises the following steps:
obtaining the suction saturation temperature T corresponding to the suction pressure P of the compressorSaturation of；
Calculating suction superheat delta T of compressorSuperheating：ΔTSuperheating＝TAir suction-TSaturation of。
According to the technical scheme of the embodiment, the heat exchange degree delta T of the evaporator can be accurately obtained in real timeEvaporation ofAnd degree of superheat Δ T of suction gas of compressorSuperheating。
Further, when the first expansion valve or the second expansion valve is opened, the valve is opened at a rate of 10 steps/s.
According to the technical scheme of the embodiment, the first expansion valve or the second expansion valve is opened at the speed of 10 steps/s, so that the phenomenon that the refrigerant is suddenly increased or decreased due to the fact that the expansion valve is suddenly opened at a large opening degree can be avoided, and the operation stability of the air-conditioning system is improved.
The invention also provides an air conditioner which comprises the device for controlling the refrigerating capacity of the air conditioner.
The air conditioner of the invention has the same technical effect as the device for controlling the cooling capacity of the air conditioner.
Drawings
FIG. 1 is a schematic view of an apparatus for controlling cooling capacity of an air conditioner according to the present invention;
FIG. 2 is a logic diagram of the method for controlling the cooling capacity of the air conditioner in accordance with the present invention.
Description of reference numerals:
1-evaporator, 2-compressor, 3-liquid storage device, 4-condenser, 5-throttling device, 6-first expansion valve, 7-second expansion valve, 8-first one-way valve, 9-second one-way valve, 10-first inner disc thermal bulb, 11-second inner disc thermal bulb, 12-air outlet thermal bulb, 13-air suction pressure valve, 14-air suction thermal bulb and 15-environment thermal bulb.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example one
The embodiment discloses a device for controlling the refrigerating capacity of an air conditioner, as shown in fig. 1, the device comprises an indoor unit and an outdoor unit, the indoor unit comprises an evaporator 1 and a throttling device 5, the outdoor unit comprises a compressor 2 and a condenser 4, and the compressor 2, the condenser 4, the throttling device 5 and the evaporator 1 are sequentially connected to form a refrigerant circulation loop. Specifically, the outlet of the evaporator 1 is connected to the suction port of the compressor 2 via a main line. The device for controlling the refrigerating capacity of the air conditioner also comprises a liquid storage device 3, wherein the liquid storage device 3 comprises a liquid storage device inlet and a liquid storage device outlet, the liquid storage device inlet is connected with the main pipeline through a first pipeline, and the liquid storage device outlet is connected with the main pipeline through a second pipeline; the first pipeline is provided with a first expansion valve 6; a second expansion valve 7 is arranged on the second pipeline.
The device for controlling the refrigerating capacity of the air conditioner is provided with the liquid storage device 3 which is connected with the main pipeline and used for recovering or supplying the refrigerant, so that the amount of the refrigerant in an air conditioning system can be adjusted in real time according to the operation load when the air conditioner operates, the refrigerating capacity of the air conditioner is adjusted, the refrigerating effect is improved, and the comfort of a user is improved.
In this embodiment, preferably, the first pipeline is further provided with a first check valve 8, and the first check valve 8 is used for controlling the first pipeline to be communicated with the inlet of the reservoir in a one-way manner from the main pipeline; and/or a second one-way valve 9 is further arranged on the second pipeline, and the second one-way valve 9 is used for controlling the second pipeline to be communicated from the outlet of the liquid storage device to the main pipeline in a one-way mode. Set up first check valve 8 and second check valve 9, can effectively prevent refrigerant backward flow in first pipeline and the second pipeline, improve the reliability that reservoir 3 retrieved or supplied the refrigerant.
In the preferred embodiment, a first inner-disk thermal bulb 10 is installed at the inlet of the evaporator 1; a second inner-disc temperature sensing bulb 11 is installed at the outlet of the evaporator 1; an air outlet thermal bulb 12 is arranged at an air outlet of the indoor unit; and/or a suction pressure valve 13 and a suction temperature sensing bulb 14 are respectively arranged at a suction port of the compressor 2; and/or an environment temperature sensing bulb 15 is arranged on the indoor unit. Wherein, the first inner disk thermal bulb 10 is used for detecting the inlet temperature T of the evaporatorDish temperature 1Second inner discThe temperature sensing bulb 11 is used for detecting the outlet temperature T of the evaporatorDish temperature 2The air outlet temperature sensing bulb 12 is used for detecting the air outlet temperature T of the indoor unitAir outletThe environment temperature sensing bulb 15 is used for detecting the environment temperature T of the indoor unitRing (C)The suction pressure valve 13 is used for detecting the suction pressure P of the compressor 2, and the suction bulb 14 is used for detecting the suction temperature T of the compressor 2Air suction。
Preferably, the device for controlling the cooling capacity of the air conditioner comprises a controller, and the controller is respectively connected with the compressor, the first expansion valve 6, the second expansion valve 7, the first inner disc thermal bulb 10, the second inner disc thermal bulb 11, the air outlet thermal bulb 12, the environment thermal bulb 15, the air suction pressure valve 13 and the air suction thermal bulb 14. More preferably, a program for automatically converting the evaporation pressure and the saturation temperature is arranged in the controller, the suction pressure valve 13 detects the suction pressure P of the compressor 2 and sends the suction pressure P to the controller, and the controller obtains the suction saturation temperature T corresponding to the suction pressure P according to the set programSaturation of。
Example two
The embodiment provides a method for controlling the cooling capacity of an air conditioner, which comprises the following steps:
detecting evaporator inlet temperature TDish temperature 1Evaporator outlet temperature TDish temperature 2Air outlet temperature T of indoor unitAir outletThe ambient temperature T of the indoor unitRing (C)And the suction temperature T of the compressor 2Air suctionAnd suction pressure P;
obtaining the heat exchange degree delta T of the evaporator 1Evaporation ofAnd degree of superheat Δ T of suction gas of compressor 2Superheating；
Judging whether the condition 1 is met: if the condition 1 is met, controlling the first expansion valve 6 to be kept closed, opening the second expansion valve 7 until the condition 1 is not met, and closing the second expansion valve 7;
wherein condition 1 is: delta TEvaporation of＞K1And T isAir outlet＞K2。
Further, in the present embodiment, after "controlling the first expansion valve 6 to remain closed, opening the second expansion valve 7 until the condition 1 is not satisfied, and closing the second expansion valve 7", it is determined whether or not the condition 1 is satisfied again.
When the condition 1 is met, the refrigerant quantity of the air-conditioning system is too small, so that the temperature of the evaporator 1 is easily low, and condensed water is generated; the second expansion valve 7 is opened, so that the refrigerant in the liquid reservoir 3 flows into the main pipeline, the circulating refrigerant quantity of the air conditioning system can be increased, the low pressure of the air conditioning system is improved, and the problem of condensation and water leakage of the air conditioner is prevented.
In the present embodiment, the evaporator 1 has a heat exchange degree Δ TEvaporation ofThe calculation formula of (2) is as follows: delta TEvaporation of＝TDish temperature 2-TDish temperature 1。
The method for acquiring the suction superheat degree of the compressor 2 comprises the following steps:
obtaining a suction saturation temperature T corresponding to a suction pressure P of the compressor 2Saturation of；
Calculating the suction superheat DeltaT of the compressor 2Superheating：ΔTSuperheating＝TAir suction-TSaturation of。
In this example, K1、K2And the constant is set before the air conditioner leaves the factory, and the numerical value of the constant is related to the type of the air conditioning system. For example: 26 machines, K1Set at 3 ℃, K2Set at 19 ℃; 35 machine, K1Usually set at 4 ℃, K2Typically set at 20 deg.c.
If the condition 1 is not met, judging whether the condition 2 is met: if the condition 2 is met, controlling the second expansion valve 7 to be kept closed, opening the first expansion valve 6 until the condition 2 is not met, and closing the first expansion valve 6;
wherein condition 2 is: delta TSuperheating＜K3。
Further, in the present embodiment, after "controlling the second expansion valve 7 to be kept closed, opening the first expansion valve 6 until the condition 2 is not satisfied, and closing the first expansion valve 6", it is determined whether or not the condition 1 is satisfied again.
When the condition 2 is met, the refrigerant quantity of the air conditioning system is too much, the liquid refrigerant in the evaporator 1 is not completely evaporated, the return air temperature is too low, and part of the unevaporated liquid refrigerant can be sucked into the compressor 2, so that the liquid impact of the compressor 2 is caused, and the service life of the compressor 2 is influenced; the first expansion valve 6 is opened, so that the refrigerant in the air-conditioning system flows into the liquid storage device 3, the refrigerant circulation quantity of the air-conditioning system is reduced, the suction superheat degree is improved, and the problem of liquid impact of the compressor 2 of the air conditioner is prevented.
In this example, K3And the value of the constant set before the air conditioner leaves the factory is related to the model of the air conditioning system. Typically set at 5 deg.c.
If the condition 2 is not met, judging whether the condition 3 is met:
if the condition 3 is met, controlling the first expansion valve 6 to be kept closed, opening the second expansion valve 7 until the condition 3 is not met, and closing the second expansion valve 7;
if the condition 3 is not met, namely the condition 4 is met, controlling the second expansion valve 7 to be kept closed, opening the first expansion valve 6 until the condition 3 is not met, and closing the first expansion valve 6;
wherein condition 3 is: t isRing (C)-TIs provided with> K, condition 4 is: t isRing (C)-TIs provided with≤K，TIs provided withThe temperature is set for the user.
The value of K can be selected according to the operation requirement of the air conditioning system. In the preferred embodiment, the value of K is 2 ℃.
Further, in the present embodiment, after "controlling the first expansion valve 6 to remain closed, opening the second expansion valve 7 until the condition 3 is not satisfied, and closing the second expansion valve 7", it is determined whether or not the condition 2 is satisfied again.
After "controlling the second expansion valve 7 to remain closed, opening the first expansion valve 6 until the condition 3 is not satisfied, and closing the first expansion valve 6", it is determined again whether the condition 1 is satisfied.
When the difference between the ambient temperature and the temperature set by the user is large, the second expansion valve 7 is opened, so that the refrigerant in the liquid storage device 3 flows into the air conditioning system, the circulating refrigerant quantity of the air conditioning system is increased, the refrigerating capacity is improved, and the comfort level and the user acceptance are improved; when the difference between the ambient temperature and the temperature set by the user is small, the first expansion valve 6 is opened, so that the refrigerant in the air-conditioning system flows into the liquid reservoir 3, the circulating refrigerant quantity of the air-conditioning system is reduced, the refrigerating capacity is reduced, and the energy is saved.
In the present embodiment, it is preferable that the first expansion valve 6 or the second expansion valve 7 is opened at a speed of 10 steps/s. The first expansion valve 6 or the second expansion valve 7 is opened at a speed of 10 steps/s, so that the sudden increase or decrease of the refrigerant caused by the sudden opening of the expansion valve with a large opening degree can be avoided, and the operation stability of the air conditioning system is improved.
EXAMPLE III
The embodiment provides an air conditioner, which comprises any one of the devices for controlling the cooling capacity of the air conditioner.
The air conditioner of this embodiment has the same technical effects as the device for controlling the cooling capacity of the air conditioner of the first embodiment, and will not be described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The method for controlling the refrigerating capacity of the air conditioner is characterized in that the device for controlling the refrigerating capacity of the air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an evaporator (1), the outdoor unit comprises a compressor (2), an outlet of the evaporator (1) is connected with an air suction port of the compressor (2) through a main pipeline and comprises a liquid storage device (3), the liquid storage device (3) comprises a liquid storage device inlet and a liquid storage device outlet, the liquid storage device inlet is connected with the main pipeline through a first pipeline, and the liquid storage device outlet is connected with the main pipeline through a second pipeline; a first expansion valve (6) is arranged on the first pipeline; a second expansion valve (7) is arranged on the second pipeline; a first inner disc temperature sensing bulb (10) is installed at the inlet of the evaporator (1); a second inner-disc temperature sensing bulb (11) is installed at the outlet of the evaporator (1); an air outlet thermal bulb (12) is arranged at an air outlet of the indoor unit; an environment temperature sensing bulb (15) is installed on the indoor unit, and a suction pressure valve (13) and a suction temperature sensing bulb (14) are respectively installed at a suction port of the compressor (2); the method for controlling the cooling capacity of the air conditioner comprises the following steps:
detecting evaporator inlet temperature TDish temperature 1Evaporator outlet temperature TDish temperature 2Air outlet temperature T of indoor unitAir outletThe ambient temperature T of the indoor unitRing (C)And the suction temperature T of the compressor (2)Air suctionAnd suction pressure P;
obtaining the heat exchange degree delta T of the evaporatorEvaporation ofAnd the suction superheat degree delta T of the compressor (2)Superheating；
Judging whether the condition 1 is met: if the condition 1 is met, controlling the first expansion valve (6) to be kept closed, opening the second expansion valve (7) until the condition 1 is not met, and closing the second expansion valve (7);
wherein condition 1 is: delta TEvaporation of＞K1And T isAir outlet＞K2(ii) a The evaporator heat exchange degree Delta TEvaporation ofThe calculation formula of (2) is as follows: delta TEvaporation of＝TDish temperature 2-TDish temperature 1。
2. The method for controlling cooling capacity of an air conditioner according to claim 1,
the first pipeline is also provided with a first one-way valve (8), and the first one-way valve (8) is used for controlling the first pipeline to be communicated with the inlet of the liquid storage device in a one-way mode from the main pipeline; and/or the presence of a gas in the gas,
and a second one-way valve (9) is further arranged on the second pipeline, and the second one-way valve (9) is used for controlling the second pipeline to be communicated with the main pipeline in a one-way mode from the outlet of the liquid storage device.
3. The method for controlling cooling capacity of an air conditioner according to claim 1, further comprising:
if the condition 1 is not met, judging whether the condition 2 is met: if the condition 2 is met, controlling the second expansion valve (7) to be kept closed, opening the first expansion valve (6) until the condition 2 is not met, and closing the first expansion valve (6);
wherein condition 2 is: delta TSuperheating＜K3。
4. A method for controlling cooling capacity of an air conditioner according to claim 3, further comprising:
if the condition 2 is not met, judging whether the condition 3 is met:
if the condition 3 is met, controlling the first expansion valve (6) to be kept closed, opening the second expansion valve (7) until the condition 3 is not met, and closing the second expansion valve (7);
if the condition 3 is not met, controlling the second expansion valve (7) to be kept closed, opening the first expansion valve (6) until the condition 3 is not met, and closing the first expansion valve (6);
wherein condition 3 is: t isRing (C)-TIs provided with＞K，TIs provided withThe temperature is set for the user.
5. The method for controlling cooling capacity of an air conditioner according to claim 3 or 4, wherein the obtaining of the suction superheat of the compressor (2) comprises:
obtaining a suction saturation temperature T corresponding to a suction pressure P of the compressor (2)Saturation of；
Calculating the suction superheat delta T of the compressor (2)Superheating：ΔTSuperheating＝TAir suction-TSaturation of。
6. The method for controlling cooling capacity of an air conditioner according to claim 3 or 4,
when the first expansion valve (6) or the second expansion valve (7) is opened, the valve is opened at a speed of 10 steps/s.
7. An air conditioner characterized by being used for executing the method for controlling the refrigerating capacity of the air conditioner as claimed in any one of claims 1 to 6.
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| CN112944617B (en) * | 2021-01-29 | 2022-09-06 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner and air conditioner |
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