CN113757979B - Control method of air conditioning system, and computer-readable storage medium - Google Patents

Control method of air conditioning system, and computer-readable storage medium Download PDF

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Publication number
CN113757979B
CN113757979B CN202010485534.3A CN202010485534A CN113757979B CN 113757979 B CN113757979 B CN 113757979B CN 202010485534 A CN202010485534 A CN 202010485534A CN 113757979 B CN113757979 B CN 113757979B
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valve
temperature
conditioning system
economizer
compressor
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CN113757979A (en
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颜利波
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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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
    • 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
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers
    • 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
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

Abstract

The invention provides a control method and a control system of an air conditioning system and a computer readable storage medium. Wherein, air conditioning system includes: the control method of the air conditioning system comprises the following steps of: acquiring the ambient temperature of the indoor unit and the starting capacity requirement of the indoor unit based on the heating mode; and controlling the working states of the first valve and the second valve according to the ambient temperature and the starting capacity requirement. The control method of the air conditioning system provided by the invention is beneficial to ensuring the reliability of enhanced vapor injection or enhanced vapor injection and ensuring good heating capacity of the air conditioning system in a larger temperature range of a low-temperature environment and under the condition of different starting capacity requirements.

Description

Control method of air conditioning system, and computer-readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioning system, the air conditioning system and a computer readable storage medium.
Background
In the existing air conditioning system, in a low-temperature heating environment, a refrigerant injection enthalpy increasing technology is generally adopted to increase the circulation volume of the refrigerant, so that the heating capacity of the air conditioning system is improved. However, since the ambient temperature range of the low-temperature environment is large, the amount of the enthalpy-increasing refrigerant is adjusted only according to the ambient temperature, so that the heating capacity of the air conditioning system cannot be effectively improved in the low-temperature environment with a large range.
Disclosure of Invention
The present invention has been made to solve at least one of the problems occurring in the prior art or the related art.
To this end, a first aspect of the present invention proposes a control method of an air conditioning system.
A second aspect of the present invention provides an air conditioning system.
A third aspect of the invention proposes a computer-readable storage medium.
In view of this, a first aspect of the present invention provides a control method of an air conditioning system, the air conditioning system including: the control method of the air conditioning system comprises the following steps of: based on the heating mode, acquiring the ambient temperature of the indoor unit and the starting capability requirement of the indoor unit; and controlling the working states of the first valve and the second valve according to the ambient temperature and the starting capacity requirement.
The invention provides a control method of an air conditioning system, which comprises a compressor, an outdoor heat exchanger, an indoor unit, an economizer, a first valve and a second valve, wherein the economizer is communicated with the outdoor heat exchanger and the indoor unit and communicated with the compressor to provide refrigerant for the compressor under the condition of low-temperature heating so as to realize enthalpy increasing effect, the first valve is arranged between the economizer and the outdoor heat exchanger, the first valve is configured to be suitable for adjusting the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer, and the second valve is configured to be suitable for adjusting the amount of the refrigerant flowing into the compressor through the economizer. The control method of the air conditioning system comprises the following steps: the air conditioning system is in a heating mode, obtains the ambient temperature of the indoor unit and the starting capacity requirement of the indoor unit, controls the working states of the first valve and the second valve according to the ambient temperature and the starting capacity requirement, enables the quantity of the refrigerant flowing into the compressor through the economizer and the outdoor heat exchanger and the quantity of the refrigerant flowing into the compressor through the economizer to be matched with the ambient temperature and the starting capacity requirement of the indoor unit, the air conditioning system has sufficient refrigerant circulation amount under the conditions of large temperature range of low-temperature environment and different starting capability requirements, so that the reliability of enhanced vapor injection or liquid injection is ensured, meanwhile, good heating capability is ensured, and the comfort of use of a user is improved.
In addition, the control method of the air conditioning system in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, further, the step of controlling the working states of the first valve and the second valve according to the environmental temperature and the requirement of the starting-up capability specifically includes: acquiring the exhaust superheat degree based on the condition that the ambient temperature is less than the temperature threshold value and the starting capacity requirement is greater than or equal to the starting capacity requirement threshold value; controlling the working states of the first valve and the second valve according to the superheat degree of the exhaust gas; acquiring the exhaust superheat degree and the superheat degree of an economizer on the basis of the condition that the ambient temperature is greater than a temperature threshold value and/or the starting-up capacity requirement is smaller than a starting-up capacity requirement threshold value; the operating state of the first valve is controlled according to the degree of superheat of the exhaust gas, and the operating state of the second valve is controlled according to the degree of superheat of the economizer.
In the technical scheme, a specific control scheme for controlling the working states of the first valve and the second valve according to the ambient temperature and the starting capacity requirement is defined. On one hand, when the ambient temperature is less than the temperature threshold and the starting capability requirement is greater than or equal to the starting capability requirement threshold, at this time, it indicates that the ambient temperature is extremely low, the ambient temperature is ultralow, the pressure on the low-pressure side of the air conditioning system is extremely low, a refrigerant is not easy to flow into the compressor through the outdoor heat exchanger, and the load of the air conditioning system during starting is large, and the heating capability needs to be rapidly improved in a large-load operation state. Through obtaining the exhaust superheat degree, the condition of the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger can be known through the exhaust superheat degree, and then the working states of the first valve and the second valve are controlled according to the exhaust superheat degree, the refrigerant amount flowing into the compressor through the first valve is adjusted to the economizer, the refrigerant amount flowing into the compressor through the economizer is adjusted through the second valve, and then the refrigerant circulation amount of the air-conditioning system is matched with the environmental temperature, the starting capability requirement and the exhaust superheat degree, so that the refrigerant circulation amount of the air-conditioning system can be rapidly improved, the heating capability of the air-conditioning system can be rapidly improved, good enthalpy increasing effect and heating effect can be ensured, meanwhile, the liquid compression of the compressor is avoided, and the reliability of the compressor is improved.
On the other hand, when the ambient temperature is greater than the temperature threshold, it indicates that the ambient temperature is a normal low-temperature environment, and the normal low-temperature ambient temperature is higher than the ultra-low-temperature ambient temperature, at this time, the pressure on the low-pressure side of the air conditioning system is lower, but is greater than the pressure on the low-pressure side at the ultra-low-temperature ambient temperature, and the capacity of the refrigerant flowing into the compressor through the outdoor heat exchanger is stronger than that at the ultra-low-temperature environment; secondly, when the starting capacity requirement is smaller than the starting capacity requirement threshold, the load of the air-conditioning system during starting is smaller or tends to be balanced, and the heating capacity of the air-conditioning system can be slowly improved; and thirdly, when the ambient temperature is greater than the temperature threshold and the starting capability requirement is less than the starting capability requirement threshold, the pressure of the low-pressure side of the air-conditioning system is lower, and the starting load of the air-conditioning system is smaller or tends to be balanced. Under the three conditions, the condition of the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger can be known according to the exhaust superheat degree by acquiring the exhaust superheat degree, and the working state of the first valve is controlled through the exhaust superheat degree, so that the amount of the refrigerant flowing into the compressor through the economizer and the outdoor heat exchanger is matched with the exhaust superheat degree, and an air-conditioning system is favorably provided with sufficient refrigerant circulation to improve the heating capacity; through obtaining the superheat degree of the economizer, the refrigerant quantity flowing into the compressor through the economizer can be known according to the superheat degree of the economizer, and then the working state of the second valve is controlled through the superheat degree of the economizer, so that the reliability of enhanced vapor injection or liquid injection is improved.
In any of the above technical solutions, the step of controlling the operating states of the first valve and the second valve according to the degree of superheat of the exhaust gas specifically includes: controlling the first valve to reduce the opening degree and controlling the second valve to increase the opening degree on the basis that the exhaust superheat degree is larger than a first exhaust superheat degree threshold value or the exhaust superheat degree is smaller than a second exhaust superheat degree threshold value; controlling a first valve to maintain the current opening degree and controlling a second valve to maintain the current opening degree based on the exhaust superheat degree being less than or equal to a first exhaust superheat degree threshold value and being greater than or equal to a second exhaust superheat degree threshold value; and the first exhaust gas superheat threshold value is larger than the second exhaust gas superheat threshold value.
In this technical solution, a specific control scheme is defined for controlling the operating states of the first valve and the second valve in accordance with the degree of superheat of the exhaust gas. Because the ambient temperature is lower than the temperature threshold value at this time, it indicates that the low-pressure side pressure of the system is particularly low, and the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger is relatively small, that is, the particularly low pressure is not favorable for the refrigerant to smoothly flow into the compressor through the outdoor heat exchanger. On one hand, on the basis that the exhaust superheat degree is larger than a first exhaust superheat degree threshold value, or the exhaust superheat degree is smaller than a second exhaust superheat degree threshold value, wherein the first exhaust superheat degree threshold value is larger than the second exhaust superheat degree threshold value, it is indicated that the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer is too small or too large, the pressure of the current low-pressure side of the air-conditioning system is low, the refrigerant flowing into the outdoor heat exchanger is not facilitated to flow into the compressor, the opening degree is reduced by controlling the first valve, the opening degree is increased by controlling the second valve, the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer is reduced under the condition that the amount of the refrigerant flowing into the compressor through the compressor outlet is not changed, the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger is reduced, meanwhile, the amount of the refrigerant flowing into the compressor through the economizer is increased, a large amount of the refrigerant flows into the compressor through the economizer, the circulation amount of the refrigerant is greatly increased, the heating capacity of the system is improved, and the heating capacity of the system is improved rapidly, and the situation that the compressor liquid of the compressor is compressed due to the system is started under the large-load operation condition is avoided, the situation that the liquid injection of the economizer is excessively sprayed, the compressor, the service life of the compressor is prolonged, and the reliability of the air-conditioning system is improved.
On the other hand, based on the fact that the exhaust superheat degree is smaller than or equal to the first exhaust superheat degree threshold value and larger than or equal to the second exhaust superheat degree threshold value, the current exhaust superheat degree is in a reasonable range, the current refrigerant circulation quantity of the air-conditioning system is matched with the ambient temperature, the starting capability requirement and the exhaust superheat degree, namely the current performance and the energy efficiency of the air-conditioning system are matched, the current opening degree is maintained by controlling the first valve, the current opening degree is maintained by controlling the second valve, and a good air injection enthalpy gain effect or a good liquid injection enthalpy gain effect is guaranteed, so that the air-conditioning system maintains good heating capability.
In any of the above technical solutions, further, the step of controlling the operating state of the first valve according to the degree of superheat of the exhaust gas specifically includes: controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is larger than a third exhaust superheat degree threshold value; controlling the first valve to reduce the opening degree based on the condition that the exhaust superheat degree is less than or equal to a third exhaust superheat degree threshold value; and the third exhaust superheat threshold value is greater than or equal to the first exhaust superheat threshold value.
In this technical solution, a specific control scheme is defined for controlling the operating state of the first valve in accordance with the degree of superheat of the exhaust gas. At this time, the ambient temperature is greater than the temperature threshold, and/or the starting-up capability requirement is less than the starting-up capability requirement threshold, that is, the low-pressure side pressure of the current air conditioning system is lower and higher than the pressure of the low-pressure side in the ultra-low temperature environment, that is, at this time, the refrigerant can smoothly flow into the compressor through the outdoor heat exchanger, and the refrigerant can smoothly flow into the compressor through the economizer. Therefore, on the one hand, on the basis of the condition that the exhaust superheat degree is larger than the third exhaust superheat degree threshold value, wherein the third exhaust superheat degree is larger than the first exhaust superheat degree, the quantity of the refrigerant flowing into the compressor through the outdoor heat exchanger is particularly small, the opening degree is increased by controlling the first valve, the quantity of the refrigerant flowing into the outdoor heat exchanger through the economizer is increased, and then a large quantity of the refrigerant flows into the compressor through the outdoor heat exchanger, the refrigerant circulation quantity of the air-conditioning system is greatly improved, and the good heating capacity of the air-conditioning system under the low-temperature condition is guaranteed.
On the other hand, based on the condition that the exhaust superheat degree is less than or equal to the third exhaust superheat degree threshold value, the fact that the quantity of the refrigerant flowing into the compressor through the outdoor heat exchanger is particularly large is shown, the opening degree is reduced by controlling the first valve, the quantity of the refrigerant flowing into the outdoor heat exchanger through the economizer is reduced, then, less refrigerant flows into the compressor through the outdoor heat exchanger, the refrigerant circulation quantity of the air-conditioning system is reduced, the heating capacity of the air-conditioning system is matched with the ambient temperature, the starting capacity requirement and the exhaust superheat degree, and effective matching of the performance and the energy efficiency of the air-conditioning system is achieved.
In any of the above technical solutions, further, the step of controlling the operating state of the second valve according to the degree of superheat of the economizer specifically includes: controlling the second valve to increase the opening degree based on the condition that the superheat degree of the economizer is larger than the superheat degree threshold value of the economizer; the second valve is controlled to decrease the opening degree based on the condition that the superheat degree of the economizer is less than or equal to the economizer superheat degree threshold value.
In this technical solution, a specific control scheme is defined for controlling the operating state of the second valve according to the degree of superheat of the economizer. At this time, the ambient temperature is greater than the temperature threshold, and/or the starting-up capability requirement is less than the starting-up capability requirement threshold, that is, the low-pressure side pressure of the current air conditioning system is lower and higher than the pressure of the low-pressure side in the ultra-low temperature environment, that is, at this time, the refrigerant can smoothly flow into the compressor through the outdoor heat exchanger, and the refrigerant can smoothly flow into the compressor through the economizer. Therefore, on the one hand, based on the condition that the superheat degree of the economizer is larger than the superheat degree threshold value of the economizer, the quantity of the refrigerant flowing into the compressor through the economizer is small, the opening degree is increased by controlling the second valve, the quantity of the refrigerant flowing into the compressor through the economizer is increased, the refrigerant circulation quantity of the air conditioning system is greatly improved, and the enthalpy increasing reliability is further improved.
On the other hand, based on the condition that the superheat degree of the economizer is smaller than or equal to the superheat degree threshold value of the economizer, the fact that the quantity of the refrigerant flowing into the compressor through the economizer is large is indicated, the opening degree is reduced by controlling the second valve, the quantity of the refrigerant flowing into the compressor through the economizer is reduced, the refrigerant circulation quantity of the air-conditioning system is greatly reduced, the heating capacity of the air-conditioning system is matched with the ambient temperature, the starting capacity requirement and the superheat degree of the economizer, and effective matching of performance and energy efficiency of the air-conditioning system is achieved.
In any of the above technical solutions, further, the range of the first exhaust superheat threshold is as follows: 15 ℃ to 35 ℃; the range of the second exhaust superheat degree threshold value is as follows: 0 ℃ to 20 ℃; the third exhaust superheat threshold range is: 20 ℃ to 50 ℃; the range of the superheat degree threshold of the economizer is as follows: 1 ℃ to 10 ℃; the range of capacity requirement thresholds is: 30% to 50%; the temperature threshold ranges are: -15 ℃ to 0 ℃.
In the technical scheme, the range of the first exhaust superheat threshold is 15-35 ℃, the first exhaust superheat threshold is set according to the actual performance of the compressor, and the reasonable range of the first exhaust superheat threshold enables the performance of the compressor to be matched with the energy efficiency, so that the reliability of the compressor is improved.
The range of the second exhaust superheat threshold is 0-20 ℃, the second exhaust superheat threshold is set according to the actual performance of the compressor, the first exhaust superheat threshold can be set by reference, the performance of the compressor can be matched with the energy efficiency through the reasonable range of the second exhaust superheat threshold, and the reliability of the compressor can be improved.
The range of the third exhaust superheat threshold is 20-50 ℃, the third exhaust superheat threshold is set according to the actual performance of the compressor, and the reasonable range of the third exhaust superheat threshold enables the performance of the compressor to be matched with the energy efficiency, so that the reliability of the compressor is improved.
The range of the capacity demand threshold is 30% to 50%, and the range of the capacity demand threshold is set according to the actual number, structure and position of the indoor units of the air conditioning system. The reasonable range of the capacity demand threshold is beneficial to saving energy, avoiding waste and prolonging the service life of the compressor.
The temperature threshold range is-15 ℃ to 0 ℃, and the reasonable range of the temperature threshold is beneficial to enabling the air conditioning system to have a larger temperature range in a low-temperature environment, improving the reliability of the enthalpy increasing effect and ensuring good heating capacity.
In any of the above technical solutions, further, the step of obtaining the ambient temperature of the indoor unit and the starting capability requirement of the indoor unit specifically includes: acquiring the ambient temperature of the indoor unit; timing the time length of the environment temperature smaller than the temperature threshold value based on the condition that the environment temperature is smaller than the temperature threshold value; and acquiring the starting-up capacity requirement of the indoor unit based on the condition that the duration is greater than or equal to the duration threshold.
In the technical scheme, a specific control scheme for acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit is defined, wherein the environment temperature of the indoor unit is acquired first, when the environment temperature is smaller than a temperature threshold value, timing is started to be carried out on the time length when the environment temperature is smaller than the temperature threshold value, and when the time length when the environment temperature is smaller than the temperature threshold value is larger than or equal to a time length threshold value, the starting capability requirement of the indoor unit is acquired. The starting capacity requirement of the indoor unit is acquired only when the ambient temperature is lower than the temperature threshold value stably, and the situation of the compressor hydraulic compression generally occurs in an ultralow temperature environment with the ambient temperature lower than the temperature threshold value, and the starting capacity requirement of the indoor unit is larger than or equal to the starting capacity requirement threshold value, so that the setting is favorable for improving the effectiveness of acquiring the starting capacity requirement of the indoor unit and simplifying the control flow.
According to a second aspect of the present invention, there is provided an air conditioning system comprising: a compressor; the outdoor heat exchanger is communicated with the inlet end of the compressor; the indoor unit is communicated with the outlet end of the compressor; the economizer is communicated with the outdoor heat exchanger and the indoor unit and communicated with the compressor; a first valve disposed between the economizer and the outdoor heat exchanger, the first valve being configured to adjust an amount of refrigerant flowing through the economizer into the outdoor heat exchanger; a second valve configured to adjust an amount of refrigerant flowing into the compressor through the economizer; a memory configured to store a computer program; a processor configured to execute a computer program to implement the control method of the air conditioning system according to any one of the first aspect.
The invention provides an air conditioning system, which comprises a compressor, an outdoor heat exchanger, an indoor unit, an economizer, a first valve, a second valve, a memory and a processor, wherein the outdoor heat exchanger is communicated with the inlet end of the compressor, the indoor unit is communicated with the outlet end of the compressor, the economizer is communicated with the outdoor heat exchanger and the indoor unit and is communicated with the compressor so as to provide refrigerant for the compressor under the condition of low-temperature heating to realize an enthalpy increasing effect, the first valve is arranged between the economizer and the outdoor heat exchanger, the first valve is configured to be suitable for adjusting the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer, the second valve is configured to be suitable for adjusting the amount of the refrigerant flowing into the compressor through the economizer, and the memory is configured to be used for storing a computer program; the processor is configured to execute a computer program to implement the control method of the air conditioning system as any one of the embodiments of the first aspect. Since the processor is configured to execute the computer program to implement the control method of the air conditioning system according to any embodiment of the first aspect, all beneficial technical effects of the control method of the air conditioning system according to any technical solution of the first aspect are achieved, and are not described herein again.
In the above technical solution, further, the economizer includes: the first outlet is communicated with the outdoor heat exchanger, and the first valve is positioned between the first outlet and the outdoor heat exchanger; a second outlet communicated with the compressor; and the inlet is communicated with the indoor unit.
In the technical scheme, the economizer comprises a first outlet, a second outlet and an inlet, wherein the first outlet of the economizer is communicated with the outdoor heat exchanger, the first valve is positioned between the first outlet and the outdoor heat exchanger, the second outlet is communicated with the compressor, and the inlet is communicated with the indoor unit. Specifically, a refrigerant in the air-conditioning system forms a main system loop through an outlet end of a compressor, an indoor unit, an inlet of an economizer, a first outlet of the economizer, an outdoor heat exchanger and an inlet end of the compressor, the refrigerant forms an auxiliary system loop through the outlet end of the compressor, the indoor unit, the inlet of the economizer, a second outlet of the economizer and the compressor, and a gaseous refrigerant or a vapor-liquid mixed refrigerant is sprayed into a middle pressure cavity of the compressor through the auxiliary loop to increase enthalpy in a heating mode under a low-temperature environment, so that the refrigerant circulation quantity of the air-conditioning system is improved, and the heating capacity of the air conditioner at a low temperature is improved.
In any of the above technical solutions, further, the economizer includes a subcooler, and the subcooler further includes: the connecting port is communicated with the second outlet, and the inlet is communicated with the first outlet; wherein, the connector is communicated with the first outlet, or the connector is communicated with a pipeline between the indoor unit and the inlet.
In the technical scheme, the economizer comprises a subcooler and a connector, wherein the connector is communicated with a second outlet, an inlet is communicated with a first outlet, on one hand, the connector is communicated with the first outlet, namely, the connector is communicated with a pipeline between the first outlet of the subcooler and the outdoor heat exchanger, namely, the connector is positioned at the downstream of the subcooler; on the other hand, the connecting port is communicated with the pipeline between the indoor unit and the inlet, namely the connecting port is positioned at the upstream of the subcooler, the different arrangement positions and the different connection modes of the connecting port can meet the requirements of different structures of the subcooler and different connection modes of the pipeline of the air conditioning system, and the application range is wide. Specifically, the subcooler includes four ports, a first outlet, a second outlet, an inlet, and a connecting port.
In any of the above technical solutions, further, based on the connection between the connection port and the first outlet, the second valve is provided between the connection port and a pipeline between the first outlet and the first valve, or between the second outlet and the compressor; based on the connection between the connection port and the indoor unit and the inlet, the second valve is set between the connection port and the pipe or between the second outlet and the compressor.
In this technical scheme, under the condition that the connector is linked together with first export, on the one hand, the second valve is located between pipeline and the connector between first export and the first valve, and the second valve is located the connector and deviates from the pipeline of second export promptly, and the refrigerant volume that flows into the connector through the first export of cold ware is adjusted to the second valve, and then realizes adjusting the refrigerant volume that flows into the compressor through the cold ware. On the other hand, the second valve is arranged between the second outlet and the compressor, namely the second valve adjusts the refrigerant quantity flowing into the compressor through the second outlet of the cooler.
On the one hand, the second valve is arranged between the pipeline and the connecting port, namely the second valve adjusts the amount of the refrigerant flowing into the connecting port through the indoor unit, and further the amount of the refrigerant flowing into the compressor through the cooler is adjusted. On the other hand, the second valve is arranged between the second outlet and the compressor, namely the second valve adjusts the refrigerant quantity flowing into the compressor through the second outlet of the cooler.
In any of the above technical solutions, further, the method further includes: a first temperature detection device configured to detect a temperature of the second outlet; a second temperature detection device configured to detect a saturation temperature corresponding to a pressure of the connection port; and the difference value between the temperature detected by the first temperature detection device and the temperature detected by the second temperature detection device is the superheat degree of the economizer.
In this technical solution, the air conditioning system further includes a first temperature detection device and a second temperature detection device, the first temperature detection device is configured to detect a temperature of a second outlet of the subcooler, the second temperature detection device is configured to detect a saturation temperature corresponding to a pressure of a connection port of the subcooler, and then a superheat degree of the subcooler, that is, a superheat degree of the economizer, is calculated according to a difference between a detected temperature of the first temperature detection device and a detected temperature of the second temperature detection device.
In any of the above technical solutions, further, the economizer includes a flash evaporator, an inlet is communicated with the first outlet, and an inlet is communicated with the second outlet; wherein the second valve is disposed between the second outlet and the compressor.
In the technical scheme, the economizer is a flash evaporator, the inlet is communicated with the first outlet, the inlet is communicated with the second outlet, namely, the refrigerant flowing in through the inlet can flow out through the first outlet and the second outlet and is arranged between the second outlet and the compressor through the second valve, so that the amount of the refrigerant flowing into the compressor through the second outlet of the flash evaporator is adjusted through the second valve, and the amount of the refrigerant flowing into the compressor through the flash evaporator is adjusted.
In any of the above technical solutions, further, the method further includes: a third temperature detection device configured to detect a temperature of the second outlet; a fourth temperature detection device configured to detect a saturation temperature corresponding to the pressure of the second outlet; and the difference value between the detection temperature of the third temperature detection device and the detection temperature of the fourth temperature detection device is the superheat degree of the economizer. In this technical solution, the air conditioning system further includes a third temperature detecting device and a fourth temperature detecting device, the third temperature detecting device is configured to detect a temperature of the second outlet of the flash evaporator, the fourth temperature detecting device is configured to detect a saturation temperature corresponding to a pressure of the second outlet of the flash evaporator, and a superheat degree of the flash evaporator, that is, a superheat degree of the economizer, is calculated according to a difference between a detected temperature of the third temperature detecting device and a detected temperature of the fourth temperature detecting device.
In any of the above technical solutions, further, the method further includes: a fifth temperature detecting means configured to detect a temperature of an outlet end of the compressor or detect a temperature of an inlet of the indoor unit; a sixth temperature detection device configured to detect a saturation temperature corresponding to a pressure of a pipe between the compressor and the indoor unit; and the difference value between the detection temperature of the fifth temperature detection device and the detection temperature of the sixth temperature detection device is the exhaust superheat degree.
In this solution, the air conditioning system further includes a fifth temperature detection device and a sixth temperature detection device, the fifth temperature detection device is configured to detect a temperature at an outlet end of the compressor or detect a temperature at an inlet of the indoor unit, the sixth temperature detection device is configured to detect a saturation temperature corresponding to a pressure of a pipeline between the compressor and the indoor unit, and the exhaust superheat degree is calculated according to a difference between a temperature detected by the fifth temperature detection device and a temperature detected by the sixth temperature detection device.
In a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, realizes the steps of the control method of the air conditioning system according to any one of the above-mentioned first aspects.
A computer-readable storage medium according to the present invention stores thereon a computer program that, when executed, implements the steps of the control method of the air conditioning system according to any one of the above-described first aspect; therefore, all the beneficial technical effects of the control method of the air conditioning system according to any one of the above first aspect are achieved, and are not described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating a control method of an air conditioning system according to a first embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioning system according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioning system according to a third embodiment of the present invention;
fig. 4 is a flowchart illustrating a control method of an air conditioning system according to a fourth embodiment of the present invention;
fig. 5 is a schematic block diagram showing an air conditioning system provided in a first embodiment of the present invention;
fig. 6 is a schematic block diagram illustrating an air conditioning system according to a second embodiment of the present invention;
fig. 7 is a schematic structural view illustrating an air conditioning system according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a control method of an air conditioning system according to a fifth embodiment of the present invention;
fig. 9 is a flowchart illustrating a control method of an air conditioning system according to a sixth embodiment of the present invention;
figure 10 shows a pressure-enthalpy diagram of an air conditioning system according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 5 to 7 is:
500 air conditioning system, 510 compressor, 512 inlet port, 514 outlet port, 520 outdoor heat exchanger, 530 indoor unit, 540 economizer, 5400 subcooler, 542 first outlet port, 544 second outlet port, 546 inlet port, 548 connecting port, 550 first valve, 560 second valve, 570 memory, 580 processor, 590 first temperature detecting device, 600 second temperature detecting device, 610 fifth temperature detecting device, 620 sixth temperature detecting device, 630 third pressure detecting device, 640 liquid storage device.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of an air conditioning system, an air conditioning system 500, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 10.
Example 1:
the invention provides a control method of an air conditioning unit, and the air conditioning system comprises the following steps: the economizer is communicated with the outdoor heat exchanger and the indoor unit and communicated with the compressor to provide refrigerant for the compressor under the condition of low-temperature heating so as to realize enthalpy increasing effect, the first valve is arranged between the economizer and the outdoor heat exchanger, the first valve is configured and suitable for adjusting the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer, and the second valve is configured and suitable for adjusting the amount of the refrigerant flowing into the compressor through the economizer.
Fig. 1 illustrates a control method of an air conditioning system according to a first embodiment of the present invention, the control method including:
step S102, acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
and step S104, controlling the working states of the first valve and the second valve according to the environmental temperature and the starting capacity requirement.
The control method of the air conditioning system provided by the invention has the advantages that the air conditioning system is in a heating mode, the ambient temperature of the indoor unit and the starting capability requirement of the indoor unit are obtained, and the working states of the first valve and the second valve are controlled according to the ambient temperature and the starting capability requirement, so that the quantity of the refrigerant flowing into the compressor through the economizer and the outdoor heat exchanger and the quantity of the refrigerant flowing into the compressor through the economizer are matched with the ambient temperature and the starting capability requirement of the indoor unit, and the air conditioning system is favorably provided with sufficient refrigerant circulation under the conditions of different starting capability requirements in a large temperature range of a low-temperature environment, thereby ensuring the reliability of enhanced vapor injection or enhanced vapor injection, ensuring good heating capability and improving the use comfort of a user.
Specifically, in a low-temperature environment, the low pressure of the air conditioning system is very low, the return air density is small, and the circulation amount of the refrigerant is usually very small, so that the heating capacity of the air conditioning system in the low-temperature environment is insufficient. And furthermore, the enthalpy increasing technology of the injected refrigerant is adopted to improve the refrigerant circulation quantity, so that the heating capacity of the air conditioner at low temperature is improved. The current refrigerant spraying enthalpy increasing technology comprises the following two modes, one mode is air spraying enthalpy increasing, and an economizer sprays gaseous refrigerant into a medium-pressure cavity of a compressor to realize enthalpy increasing effect in the compression process of the compressor; the other is liquid spraying enthalpy increasing, and the economizer sprays vapor-liquid mixed refrigerant into a middle-pressure cavity of the compressor to realize enthalpy increasing effect in the compression process of the compressor. However, the low-temperature environment has a wide range, and generally includes the situations of a conventional low temperature and an ultra-low temperature, etc., where the ambient temperature of the ultra-low temperature is lower than the ambient temperature of the conventional low temperature, and the demand for the starting-up capability of the indoor unit is also different, and if the operating states of the first valve and the second valve are controlled to achieve the enthalpy increasing effect only by considering the influence of the ambient temperature on the heating capability, in the ultra-low temperature environment with a low ambient temperature, there are problems that the low-pressure side pressure of the air conditioning system is extremely low, so that the refrigerant circulation amount of the air conditioning system is small, and good heating capability cannot be ensured, and in the ultra-low temperature environment, the situation that the compressor liquid compression is caused by excessive liquid injection of the economizer occurs due to a small demand for the starting-up capability. That is, although enhanced vapor injection can improve the heating capacity of the air conditioning system in a low-temperature environment, the enhanced vapor injection effect is limited under an ultralow-temperature condition, and excessive liquid injection is prevented from causing the compression of the compressor liquid.
Therefore, this application is through according to ambient temperature and start-up ability demand, the operating condition of control first valve and second valve for air conditioning system is in low temperature environment's great within range, namely under conventional low temperature and ultra-low temperature environment, air conditioning system's refrigerant circulation volume and ambient temperature, the ability demand phase-match of indoor set, when guaranteeing good enthalpy-adding effect, the heating capacity of system has been improved, realize the better cooperation of air conditioning system performance and efficiency, and avoided the condition of compressor liquid compression to send, be favorable to prolonging the life of compressor, the reliability of system has been improved.
Example 2:
in one embodiment of the present invention, fig. 2 shows a control method of an air conditioning system according to a second embodiment of the present invention, the control method of the air conditioning system including:
step S202, acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
step S204, acquiring the exhaust superheat degree based on the condition that the environment temperature is less than the temperature threshold value and the starting capacity requirement is more than or equal to the starting capacity requirement threshold value;
step S206, controlling the working states of the first valve and the second valve according to the exhaust superheat degree;
step S208, acquiring the exhaust superheat degree and the superheat degree of an economizer based on the condition that the environment temperature is greater than a temperature threshold value and/or the starting capacity requirement is less than a starting capacity requirement threshold value;
in step S210, the working state of the first valve is controlled according to the superheat degree of the exhaust gas, and the working state of the second valve is controlled according to the superheat degree of the economizer.
In this embodiment, a specific control scheme is defined for controlling the operating states of the first and second valves based on ambient temperature and start-up capability requirements. On one hand, when the ambient temperature is less than the temperature threshold and the starting capability requirement is greater than or equal to the starting capability requirement threshold, at this time, it indicates that the ambient temperature is extremely low, the ambient temperature is ultralow, the pressure on the low-pressure side of the air conditioning system is extremely low, a refrigerant is not easy to flow into the compressor through the outdoor heat exchanger, and the load of the air conditioning system during starting is large, and the heating capability needs to be rapidly improved in a large-load operation state. Through obtaining the exhaust superheat degree, can know the condition through the refrigerant volume of outdoor heat exchanger inflow compressor through the exhaust superheat degree, and then the operating condition of first valve of according to exhaust superheat degree control and second valve, adjust the economic ware through first valve, the refrigerant volume of outdoor heat exchanger inflow compressor, adjust the refrigerant volume of compressor inflow through the economic ware through the second valve, and then make air conditioning system's refrigerant circulation volume and ambient temperature, the starting ability demand, exhaust superheat degree phase-match, be favorable to improving air conditioning system's refrigerant circulation volume fast, and then improve air conditioning system's heating capacity fast, guarantee good enthalpy gain effect and heating effect, and simultaneously, avoid compressor liquid compression, improve the reliability of compressor.
On the other hand, when the ambient temperature is greater than the temperature threshold, it indicates that the ambient temperature is a normal low-temperature environment, and the normal low-temperature ambient temperature is higher than the ultra-low-temperature ambient temperature, at this time, the pressure on the low-pressure side of the air conditioning system is lower, but is greater than the pressure on the low-pressure side at the ultra-low-temperature ambient temperature, and the capacity of the refrigerant flowing into the compressor through the outdoor heat exchanger is stronger than that at the ultra-low-temperature environment; secondly, when the starting-up capacity requirement is smaller than the threshold value of the starting-up capacity requirement, the load of the air-conditioning system during starting up is smaller or tends to be balanced, and the heating capacity of the air-conditioning system can be slowly improved; thirdly, when the ambient temperature is greater than the temperature threshold and the starting-up capability requirement is less than the starting-up capability requirement threshold, the pressure of the low-pressure side of the air conditioning system is lower, and the load of the air conditioning system during starting up is smaller or tends to be balanced. Under the three conditions, the exhaust superheat degree is obtained, the condition of the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger can be known according to the exhaust superheat degree, and the working state of the first valve is controlled through the exhaust superheat degree, so that the amount of the refrigerant flowing into the compressor through the economizer and the outdoor heat exchanger is matched with the exhaust superheat degree, and an air conditioning system is favorably provided with sufficient refrigerant circulation amount to improve the heating capacity; by obtaining the superheat degree of the economizer, the amount of the refrigerant flowing into the compressor through the economizer can be known according to the superheat degree of the economizer, and then the working state of the second valve is controlled through the superheat degree of the economizer, so that the reliability of enhanced vapor injection or enhanced vapor injection is improved.
Further, a control manner of acquiring the degree of superheat of the exhaust gas and controlling the operating states of the first valve and the second valve in accordance with the degree of superheat of the exhaust gas is defined as: a first mode of operation control of the first and second valves; the control mode of acquiring the exhaust superheat degree and the superheat degree of the economizer, controlling the working state of the first valve according to the exhaust superheat degree and controlling the working state of the second valve according to the superheat degree of the economizer is defined as follows: the second operation control mode of the first valve and the second valve enables the air conditioning system to automatically switch the first valve and the second valve into the first operation control mode or the second operation control mode according to the relationship between the ambient temperature and the temperature threshold value and the relationship between the starting capacity requirement and the starting capacity requirement threshold value, so that the refrigerant circulation quantity of the air conditioning system meets the requirements of working conditions such as different ambient temperatures, different starting capacity requirements and the like, the refrigerant circulation quantity of the system can be rapidly increased and the heating capacity can be rapidly increased under the heating conditions of ultralow ambient temperature and large-load starting operation of the air conditioning system, the enthalpy increasing reliability of the air conditioning system can be increased under the conditions of a conventional low-temperature environment and/or small or balanced starting load, and the good heating capacity is ensured.
Example 3:
in one embodiment of the present invention, fig. 3 shows a control method of an air conditioning system of a third embodiment of the present invention, the control method of the air conditioning system including:
step S302, acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
step S304, acquiring the exhaust superheat degree based on the condition that the environment temperature is less than the temperature threshold value and the starting capacity requirement is more than or equal to the starting capacity requirement threshold value;
step S306, controlling the first valve to reduce the opening degree and controlling the second valve to increase the opening degree based on the exhaust superheat degree being larger than a first exhaust superheat degree threshold value or the exhaust superheat degree being smaller than a second exhaust superheat degree threshold value, wherein the first exhaust superheat degree threshold value is larger than the second exhaust superheat degree threshold value;
step S308, controlling the first valve to maintain the current opening degree and controlling the second valve to maintain the current opening degree based on the exhaust superheat degree being less than or equal to a first exhaust superheat degree threshold value and being greater than or equal to a second exhaust superheat degree threshold value;
step S310, acquiring the exhaust superheat degree and the superheat degree of the economizer based on the condition that the ambient temperature is greater than the temperature threshold value and/or the starting capacity requirement is less than the starting capacity requirement threshold value;
in step S312, the operating state of the first valve is controlled according to the degree of superheat of the exhaust gas, and the operating state of the second valve is controlled according to the degree of superheat of the economizer.
In this embodiment, a specific control scheme is defined for controlling the operating states of the first valve and the second valve in accordance with the degree of superheat of the exhaust gas. Because the ambient temperature is lower than the temperature threshold value at this time, it indicates that the low-pressure side pressure of the system is particularly low, and the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger is relatively small, that is, the particularly low pressure is not favorable for the refrigerant to smoothly flow into the compressor through the outdoor heat exchanger. On one hand, on the basis that the exhaust superheat degree is larger than a first exhaust superheat degree threshold value, or the exhaust superheat degree is smaller than a second exhaust superheat degree threshold value, wherein the first exhaust superheat degree threshold value is larger than the second exhaust superheat degree threshold value, it is indicated that the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer is too small or too large, the pressure of the current low-pressure side of the air-conditioning system is low, the refrigerant flowing into the outdoor heat exchanger is not facilitated to flow into the compressor, the opening degree is reduced by controlling the first valve, the opening degree is increased by controlling the second valve, the amount of the refrigerant flowing into the outdoor heat exchanger through the economizer is reduced under the condition that the amount of the refrigerant flowing into the compressor through the compressor outlet is not changed, the amount of the refrigerant flowing into the compressor through the outdoor heat exchanger is reduced, meanwhile, the amount of the refrigerant flowing into the compressor through the economizer is increased, a large amount of the refrigerant flows into the compressor through the economizer, the circulation amount of the refrigerant is greatly increased, the heating capacity of the system is improved, and the heating capacity of the system is improved rapidly, and the situation that the compressor liquid of the compressor is compressed due to the system is started under the large-load operation condition is avoided, the situation that the liquid injection of the economizer is excessively sprayed, the compressor, the service life of the compressor is prolonged, and the reliability of the air-conditioning system is improved.
On the other hand, based on the fact that the exhaust superheat degree is smaller than or equal to the first exhaust superheat degree threshold value and larger than or equal to the second exhaust superheat degree threshold value, the current exhaust superheat degree is in a reasonable range, the current refrigerant circulation quantity of the air-conditioning system is matched with the ambient temperature, the starting capability requirement and the exhaust superheat degree, namely the current performance and the energy efficiency of the air-conditioning system are matched, the current opening degree is maintained by controlling the first valve, the current opening degree is maintained by controlling the second valve, and a good air injection enthalpy gain effect or a good liquid injection enthalpy gain effect is guaranteed, so that the air-conditioning system maintains good heating capability.
Example 4:
in one embodiment of the present invention, fig. 4 shows a control method of an air conditioning system of a fourth embodiment of the present invention, the control method of the air conditioning system including:
step S402, acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
step S404, acquiring the exhaust superheat degree based on the condition that the environment temperature is less than the temperature threshold value and the starting capacity requirement is more than or equal to the starting capacity requirement threshold value;
step S406, controlling the first valve to reduce the opening degree and controlling the second valve to increase the opening degree based on the fact that the exhaust superheat degree is larger than a first exhaust superheat degree threshold value or the exhaust superheat degree is smaller than a second exhaust superheat degree threshold value, wherein the first exhaust superheat degree threshold value is larger than the second exhaust superheat degree threshold value;
step S408, controlling the first valve to maintain the current opening degree and controlling the second valve to maintain the current opening degree based on the exhaust superheat degree being less than or equal to a first exhaust superheat degree threshold value and being greater than or equal to a second exhaust superheat degree threshold value;
step S410, acquiring the exhaust superheat degree and the superheat degree of an economizer on the basis of the condition that the environment temperature is greater than a temperature threshold value and/or the starting capacity requirement is less than a starting capacity requirement threshold value;
step S412, controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is larger than a third exhaust superheat degree threshold value, wherein the third exhaust superheat degree threshold value is larger than or equal to the first exhaust superheat degree threshold value;
step S414, controlling the first valve to reduce the opening degree based on the condition that the exhaust superheat degree is less than or equal to a third exhaust superheat degree threshold value;
step S416, controlling a second valve to increase the opening degree based on the condition that the superheat degree of the economizer is larger than the superheat degree threshold value of the economizer;
in step S418, the second valve is controlled to decrease the opening degree based on the fact that the degree of superheat of the economizer is equal to or less than the economizer degree of superheat threshold value.
In this embodiment, a specific control scheme is defined for controlling the operating state of the first valve in accordance with the degree of superheat of the exhaust gas and the operating state of the second valve in accordance with the degree of superheat of the economizer. At this time, the ambient temperature is greater than the temperature threshold, and/or the starting-up capability requirement is less than the starting-up capability requirement threshold, that is, the low-pressure side pressure of the current air conditioning system is lower and higher than the pressure of the low-pressure side in the ultra-low temperature environment, that is, at this time, the refrigerant can smoothly flow into the compressor through the outdoor heat exchanger, and the refrigerant can smoothly flow into the compressor through the economizer.
Therefore, on the one hand, on the basis of the condition that the exhaust superheat degree is larger than the third exhaust superheat degree threshold value, wherein the third exhaust superheat degree is larger than the first exhaust superheat degree, the quantity of the refrigerant flowing into the compressor through the outdoor heat exchanger is particularly small, the opening degree is increased by controlling the first valve, the quantity of the refrigerant flowing into the outdoor heat exchanger through the economizer is increased, and then a large quantity of the refrigerant flows into the compressor through the outdoor heat exchanger, the refrigerant circulation quantity of the air-conditioning system is greatly improved, and the good heating capacity of the air-conditioning system under the low-temperature condition is guaranteed.
On the other hand, based on the condition that the exhaust superheat degree is less than or equal to the third exhaust superheat degree threshold value, the fact that the quantity of the refrigerant flowing into the compressor through the outdoor heat exchanger is particularly large is shown, the opening degree is reduced by controlling the first valve, the quantity of the refrigerant flowing into the outdoor heat exchanger through the economizer is reduced, then, less refrigerant flows into the compressor through the outdoor heat exchanger, the refrigerant circulation quantity of the air-conditioning system is reduced, the heating capacity of the air-conditioning system is matched with the ambient temperature, the starting capacity requirement and the exhaust superheat degree, and effective matching of the performance and the energy efficiency of the air-conditioning system is achieved.
On the other hand, based on the condition that the superheat degree of the economizer is larger than the superheat degree threshold value of the economizer, the quantity of the refrigerant flowing into the compressor through the economizer is small, the opening degree is increased by controlling the second valve, the quantity of the refrigerant flowing into the compressor through the economizer is increased, the refrigerant circulation quantity of the air conditioning system is greatly increased, and the enthalpy increasing reliability is further improved.
On the other hand, on the basis of the condition that the superheat degree of the economizer is smaller than or equal to the superheat degree threshold value of the economizer, the fact that the amount of the refrigerant flowing into the compressor through the economizer is large is indicated, the opening degree is reduced by controlling the second valve, the amount of the refrigerant flowing into the compressor through the economizer is reduced, the refrigerant circulation amount of the air-conditioning system is greatly reduced, the heating capacity of the air-conditioning system is matched with the environment temperature, the starting capacity requirement and the superheat degree of the economizer, and effective matching of performance and energy efficiency of the air-conditioning system is achieved.
Specifically, the range of the first exhaust superheat threshold is 15-35 ℃, the first exhaust superheat threshold is set according to the actual performance of the compressor, and the reasonable range of the first exhaust superheat threshold enables the performance of the compressor to be matched with the energy efficiency, so that the reliability of the compressor is improved. Specifically, the first exhaust superheat threshold is 15 ℃,20 ℃,35 ℃.
The range of the second exhaust superheat threshold value is 0-20 ℃, the second exhaust superheat threshold value is set according to the actual performance of the compressor, the first exhaust superheat threshold value can also be referred to, the reasonable range of the second exhaust superheat threshold value enables the performance of the compressor to be matched with the energy efficiency, and the reliability of the compressor is improved.
The range of the third exhaust superheat degree threshold value is 20-50 ℃, the third exhaust superheat degree threshold value is set according to the actual performance of the compressor, and the reasonable range of the third exhaust superheat degree threshold value enables the performance of the compressor to be matched with the energy efficiency, so that the reliability of the compressor is improved. Specifically, the third exhaust superheat threshold is 20 ℃,40 ℃,50 ℃.
The range of the capacity demand threshold is 30% to 50%, and the range of the capacity demand threshold is set according to the actual number, structure and position of the indoor units of the air conditioning system. The reasonable range of the capacity demand threshold is beneficial to saving energy, avoiding waste and prolonging the service life of the compressor. Specifically, the capacity requirement threshold is 30%, 40%, 50%.
The temperature threshold range is-15 ℃ to 0 ℃, and the reasonable range of the temperature threshold is beneficial to enabling the air conditioning system to have a larger temperature range in a low-temperature environment, improving the reliability of the enthalpy increasing effect and ensuring good heating capacity. Specifically, the temperature threshold is-15 deg.C, -5 deg.C, 0 deg.C.
Example 5:
as shown in fig. 1 and fig. 2, in an embodiment of the present invention, on the basis of any one of the embodiments 1 to 4, the step of obtaining the ambient temperature of the indoor unit and the starting capability requirement of the indoor unit specifically includes: acquiring the ambient temperature of the indoor unit; timing the time when the ambient temperature is less than the temperature threshold value based on the condition that the ambient temperature is less than the temperature threshold value; and acquiring the starting-up capacity requirement of the indoor unit based on the condition that the duration is greater than or equal to the duration threshold.
In this embodiment, a specific control scheme for acquiring the ambient temperature of the indoor unit and the starting-up capability requirement of the indoor unit is defined, wherein the ambient temperature of the indoor unit is acquired first, when the ambient temperature is less than a temperature threshold, a time duration that the ambient temperature is less than the temperature threshold is started to be timed, and when the time duration that the ambient temperature is less than the temperature threshold is greater than or equal to a time duration threshold, the starting-up capability requirement of the indoor unit is acquired. The starting capacity requirement of the indoor unit is acquired only when the ambient temperature is lower than the temperature threshold value and is stable, and the situation of the compressor hydraulic compression generally occurs in an ultralow temperature environment with the ambient temperature lower than the temperature threshold value, and the starting capacity requirement of the indoor unit is larger than or equal to the starting capacity requirement threshold value, so that the setting is favorable for improving the effectiveness of acquiring the starting capacity requirement of the indoor unit and simplifying the control flow.
Further, the duration threshold ranges from 5 minutes to 60 minutes, specifically, the duration threshold ranges from 5 minutes, 20 minutes, and 60 minutes.
Example 6:
as shown in fig. 5, 6 and 7, according to a second aspect of the present invention, there is provided an air conditioning system 500 including: a compressor 510; an outdoor heat exchanger 520 communicating with an inlet end 512 of the compressor 510; an indoor unit 530 communicated with an outlet port 514 of the compressor 510; an economizer 540, the economizer 540 communicating the outdoor heat exchanger 520 and the indoor unit 530, and the economizer 540 communicating with the compressor 510; a first valve 550 disposed between the economizer 540 and the outdoor heat exchanger 520, the first valve 550 being configured to adjust an amount of refrigerant flowing into the outdoor heat exchanger 520 through the economizer 540; a second valve 560, the second valve 560 being configured to adjust an amount of refrigerant flowing into the compressor 510 through the economizer 540; a memory 570 configured to store a computer program; a processor 580 configured to execute a computer program to implement the control method of the air conditioning system 500 as any of the embodiments of the first aspect. Since the air conditioning system 500 has the control method of the air conditioning system 500 of any of the embodiments, all beneficial effects of the control method of the air conditioning system 500 are achieved, and are not described herein again.
Further, the air conditioning system 500 further includes a liquid storage device 640 disposed between the inlet 512 of the compressor 510 and the outdoor heat exchanger 520.
Further, the economizer 540 includes: a first outlet 542, a second outlet 544, and an inlet 546; wherein the outdoor heat exchanger 520 is communicated with the first outlet 542, the first valve 550 is located between the first outlet 542 and the outdoor heat exchanger 520, and the second outlet 544 is communicated with the compressor 510; the inlet 546 communicates with the indoor unit 530.
In this embodiment, the economizer 540 includes a first outlet 542, a second outlet 544, and an inlet 546, wherein the first outlet 542 of the economizer 540 communicates with the outdoor heat exchanger 520, the first valve 550 is located between the first outlet 542 and the outdoor heat exchanger 520, the second outlet 544 communicates with the compressor 510, and the inlet 546 communicates with the indoor unit 530. Specifically, the refrigerant in the air conditioning system 500 forms a system main loop through the outlet end 514 of the compressor 510, the indoor unit 530, the inlet 546 of the economizer 540, the first outlet 542 of the economizer 540, the outdoor heat exchanger 520, and the inlet end 512 of the compressor 510, and the refrigerant forms a system auxiliary loop through the outlet end 514 of the compressor 510, the indoor unit 530, the inlet 546 of the economizer 540, the second outlet 544 of the economizer 540, and the compressor 510, and in a heating mode, in a low-temperature environment, a gaseous refrigerant or a vapor-liquid mixed refrigerant is injected into the medium-pressure cavity of the compressor 510 through the auxiliary loop to increase enthalpy, so as to improve the refrigerant circulation amount of the air conditioning system 500, and thus improve the heating capacity of the air conditioner at a low temperature. Specifically, the second outlet 544 communicates with the intermediate pressure cavity of the compressor 510, or with the inlet end 512 of the compressor 510.
Example 7:
as shown in fig. 5 to 7, in an embodiment of the present invention, based on the above embodiment 6, further, the economizer 540 includes a subcooler 5400, the subcooler 5400 further includes a connection port 548, the connection port 548 is communicated with the second outlet 544, and the inlet 546 is communicated with the first outlet 542; wherein the connection opening 548 is communicated with the first outlet 542, or the connection opening 548 is communicated with the pipeline between the indoor unit 530 and the inlet 546.
In this embodiment, as shown in fig. 7, the economizer 540 includes a subcooler 5400, the subcooler 5400 further includes a connecting port 548, the connecting port 548 is communicated with the second outlet 544, the inlet 546 is communicated with the first outlet 542, on the one hand, the connecting port 548 is communicated with the first outlet 542, i.e., the connecting port 548 is communicated with the pipeline between the first outlet 542 of the subcooler 5400 and the outdoor heat exchanger 520, i.e., the connecting port 548 is located downstream of the subcooler 5400; on the other hand, the connection port 548 is in communication with a pipeline between the indoor unit 530 and the inlet 546, that is, the connection port 548 is located at the upstream of the subcooler 5400, and different arrangement positions and different connection modes of the connection port 548 can meet the requirements of different structures of the subcooler 5400 and different connection modes of pipelines of the air conditioning system 500, so that the application range is wide. Specifically, the subcooler 5400 includes four ports, a first outlet 542, a second outlet 544, an inlet 546, and a connecting port 548.
Further, in the case that the connection port 548 is communicated with the first outlet port 542, on the one hand, the second valve 560 is disposed between a pipeline between the first outlet port 542 and the first valve 550 and the connection port 548, that is, the second valve 560 is disposed on a pipeline of the connection port 548 away from the second outlet port 544, and the second valve 560 adjusts the amount of the refrigerant flowing into the connection port 548 through the first outlet port 542 of the cooler 5400, thereby adjusting the amount of the refrigerant flowing into the compressor 510 through the cooler 5400. On the other hand, the second valve 560 is disposed between the second outlet 544 and the compressor 510, that is, the second valve 560 adjusts the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the cooler 5400.
Further, a pipe between the connection opening 548 and the indoor unit 530 and the inlet 546 is connected, and the second valve 560 is disposed between the pipe and the connection opening 548, that is, the second valve 560 adjusts the amount of the refrigerant flowing into the connection opening 548 through the indoor unit 530, thereby adjusting the amount of the refrigerant flowing into the compressor 510 through the cooler 5400. On the other hand, the second valve 560 is disposed between the second outlet 544 and the compressor 510, that is, the second valve 560 adjusts the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the cooler 5400.
The different positions of the second valve 560 can meet the requirements of different structures of the connecting port 548 and the requirements of different connecting modes of pipelines of the air conditioning system 500, and the application range is wide.
Further, the air conditioning system 500 further includes a first temperature detection device 590 and a second temperature detection device 600, the first temperature detection device 590 is configured to detect a temperature of the second outlet 544 of the subcooler 5400, the second temperature detection device 600 is configured to detect a saturation temperature corresponding to a pressure of the connecting port 548 of the subcooler 5400, and a superheat degree of the subcooler 5400, that is, a superheat degree of the economizer 540, is calculated according to a difference between a detected temperature of the first temperature detection device 590 and a detected temperature of the second temperature detection device 600.
Specifically, a first temperature detection device 590 is provided at the second outlet 544, and a second temperature detection device 600 is provided at the connection port 548. It is understood that the first temperature detection device 590 and the second temperature detection device 600 may be disposed at other locations as required. The first temperature detection device 590 is a temperature sensor, and the second temperature detection device 600 is a temperature sensor. Further, the air conditioning system 500 may further include a first pressure sensor provided at the connection port 548 and configured to detect a pressure of the connection port 548, and the second temperature detecting device 600 may determine a saturation temperature corresponding to the pressure of the connection port 548 of the subcooler 5400 according to a detection result of the first pressure sensor.
Example 8:
as shown in fig. 5 to 7, in an embodiment of the present invention, based on the above embodiment 6, further, the economizer 540 comprises a flash evaporator, the inlet 546 is communicated with the first outlet 542, and the inlet 546 is communicated with the second outlet 544; wherein the second valve 560 is disposed between the second outlet 544 and the compressor 510.
In this embodiment, the economizer 540 is a flash evaporator, the inlet 546 is connected to the first outlet 542, and the inlet 546 is connected to the second outlet 544, that is, the refrigerant flowing in through the inlet 546 can flow out through the first outlet 542 and the second outlet 544, and is provided between the second outlet 544 and the compressor 510 through the second valve 560, so that the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the flash evaporator is adjusted through the second valve 560, and thus the amount of the refrigerant flowing into the compressor 510 through the flash evaporator is adjusted. Specifically, the flash vessel includes three ports, a first outlet 542, a second outlet 544, and an inlet 546.
Further, the economizer 540 is a subcooler 5400 or a flash evaporator, which can meet the requirements of the air conditioning system 500 on the incapability of working and different pipeline connection modes, and the application range of the product is expanded.
Further, the air conditioning system 500 further includes a third temperature detecting device configured to detect a temperature of the second outlet 544 of the flash evaporator, and a fourth temperature detecting device configured to detect a saturation temperature corresponding to a pressure of the second outlet 544 of the flash evaporator, and further calculate a superheat degree of the flash evaporator, that is, a superheat degree of the economizer 540 according to a difference between the detected temperature of the third temperature detecting device and the detected temperature of the fourth temperature detecting device.
Specifically, a third temperature detection device is provided at the second outlet 544, and a fourth temperature detection device is provided at the second outlet 544. It is understood that the third temperature detection device and the fourth temperature detection device may be disposed at other positions to meet the requirement. The third temperature detection device is a temperature sensor, and the fourth temperature detection device is a temperature sensor. It is understood that the air conditioning system 500 may further include a second pressure sensor disposed at the second outlet 544 for detecting the pressure of the second outlet 544, and the fourth temperature detecting device determines the saturation temperature corresponding to the pressure of the second outlet 544 of the flash evaporator according to the detection result of the second pressure sensor.
Example 9:
as shown in fig. 5 to 7, in an embodiment of the present invention, on the basis of any one of the above embodiments 6 to 8, further, the present invention further includes: a fifth temperature detecting device 610 configured to detect the temperature of the outlet port 514 of the compressor 510 or the temperature of the inlet 546 of the indoor unit 530; a sixth temperature detecting means 620 configured to detect a saturation temperature corresponding to a pressure of a pipe between the compressor 510 and the indoor unit 530; the difference between the temperature detected by the fifth temperature detecting device 610 and the temperature detected by the sixth temperature detecting device 620 is the superheat degree of the exhaust gas.
In this embodiment, as shown in fig. 6 and 7, the air conditioning system 500 further includes a fifth temperature detecting device 610 and a sixth temperature detecting device 620, the fifth temperature detecting device 610 is configured to detect the temperature of the outlet end 514 of the compressor 510 or the temperature of the inlet 546 of the indoor unit 530, the sixth temperature detecting device 620 is configured to detect the saturation temperature corresponding to the pressure of the pipeline between the compressor 510 and the indoor unit 530, and the exhaust superheat degree is calculated according to the difference between the detected temperature of the fifth temperature detecting device 610 and the detected temperature of the sixth temperature detecting device 620.
Specifically, the fifth temperature detecting device 610 is disposed at the outlet end 514 of the compressor 510, and the sixth temperature detecting device 620 is disposed on the pipeline between the fifth temperature detecting device 610 and the indoor unit 530, it is understood that the fifth temperature detecting device 610 and the sixth temperature detecting device 620 may be disposed at other positions as required. The fifth temperature detecting means 610 is a temperature sensor, and the sixth temperature detecting means 620 is a temperature sensor. It is understood that the air conditioning system 500 may further include a third pressure detecting device 630, the third pressure detecting device 630 is disposed on a pipeline between the fifth temperature detecting device 610 and the indoor unit 530 for detecting a condensing pressure of the air conditioning system 500, and the sixth temperature detecting device 620 determines a protection temperature corresponding to the condensing pressure of the air conditioning system 500 according to a detection result of the third pressure detecting device 630.
Example 10:
according to a third aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed, implements the steps of the control method of the air conditioning system as in any one of the embodiments of the first aspect described above; therefore, all the advantageous technical effects of the control method of the air conditioning system according to any one of the embodiments of the first aspect are not described herein again.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The air conditioning system 500 provided by the present invention includes: the air conditioning system comprises a compressor 510, an outdoor heat exchanger 520, an indoor unit 530, an economizer 540, a first valve 550, a second valve 560, a first temperature detection device 590, a second temperature detection device 600, a fifth temperature detection device 610 and a third pressure detection device 630, wherein the economizer 540 is a subcooler 5400, the indoor unit 530 is positioned between pipelines M and N of the air conditioning system 500 shown in FIG. 7, namely, an inlet end 512 of the compressor 510 is communicated with the outdoor heat exchanger 520, an outlet end 514 of the compressor 510 is communicated with the indoor unit 530, an inlet 546 of the subcooler 5400 is communicated with the indoor unit 530, a first outlet 542 of the subcooler 5400 is communicated with the outdoor heat exchanger 520, a second outlet 544 of the subcooler 5400 is communicated with the compressor 510, and a connecting port 548 of the subcooler 5400 is communicated with the first outlet 542, the first valve 550 is located on a pipeline between the first outlet 542 and the outdoor heat exchanger 520, the second valve 560 is located on a pipeline between the first outlet 542 and the first valve 550 and the connection port 548, the first temperature detection device 590 is arranged at the second outlet 544 and is used for detecting the temperature of the second outlet 544, the second temperature detection device 600 is arranged at the connection port 548 and is used for detecting the protection temperature corresponding to the pressure at the connection port 548, the fifth temperature detection device 610 is arranged at the outlet end 514 of the compressor 510 and is used for detecting the temperature at the outlet end 514 of the compressor 510, and the third pressure detection device is arranged on a pipeline between the fifth temperature detection device 610 of the compressor 510 and the indoor unit 530 and is used for detecting the condensing pressure of the air conditioning system 500.
Specifically, fig. 8 shows a control method of an air conditioning system of a fifth embodiment of the present invention, the control method of the air conditioning system including:
step S802, acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
step S804, acquiring the exhaust superheat degree based on the condition that the environment temperature is less than the temperature threshold value and the starting capability requirement is more than or equal to the starting capability requirement threshold value;
step S806, judging whether the exhaust superheat degree is larger than a first exhaust superheat degree threshold value or not, or whether the exhaust superheat degree is smaller than a second exhaust superheat degree threshold value, wherein the first exhaust superheat degree threshold value is larger than the second exhaust superheat degree threshold value, if yes, executing step S808, and if not, executing step S810;
step S808, controlling the first valve to reduce the opening degree and controlling the second valve to increase the opening degree;
and step S810, controlling the first valve to maintain the current opening degree, and controlling the second valve to maintain the current opening degree.
In this embodiment, a control method of the first valve and the second valve of the air conditioning system in the heating mode is provided, where the ambient temperature of the indoor unit of the air conditioning system is the ultra-low temperature ambient temperature, and the starting capacity requirement is the large load operation state. At this time, a control method of the first valve and the second valve is referred to as a first operation control method, i.e., an ultra-low-temperature valve body control method. Specifically, by acquiring the exhaust superheat degree, when the exhaust superheat degree is judged to be larger than a first exhaust superheat degree threshold value or the exhaust superheat degree is judged to be smaller than a second exhaust superheat degree threshold value, the opening degree of the first valve is reduced, the opening degree of the second valve is increased, and otherwise, the first valve and the second valve are kept at the current opening degree.
Specifically, fig. 9 shows a control method of an air conditioning system of a sixth embodiment of the present invention, the control method of the air conditioning system including:
step S902, acquiring the environment temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
step S904, acquiring the exhaust superheat degree and the superheat degree of the economizer based on the condition that the environmental temperature is greater than the temperature threshold value and/or the starting capacity requirement is less than the starting capacity requirement threshold value;
step S906, judging whether the exhaust superheat degree is greater than a third exhaust superheat degree threshold value, wherein the third exhaust superheat degree threshold value is greater than or equal to the first exhaust superheat degree threshold value, if so, executing step S908, otherwise, executing step S910;
step S908, controlling the first valve to increase the opening degree;
step S910, controlling the first valve to reduce the opening;
step S912, judging whether the superheat degree of the subcooler is larger than the superheat degree threshold value of the economizer, if so, executing step S914, otherwise, executing step S916;
step S914, controlling the second valve to increase the opening degree;
in step S916, the second valve is controlled to decrease the opening degree.
In this embodiment, a control method of the first valve and the second valve of the air conditioning system in the heating mode is provided, where the ambient temperature of the indoor unit of the air conditioning system is the normal temperature ambient temperature, and/or the starting capability requirement is a small load or a proper load operation state. At this time, a control method of the first valve and the second valve is referred to as a second operation control method, i.e., a conventional low temperature valve body control method. Specifically, by acquiring the exhaust superheat degree, when the exhaust superheat degree is judged to be larger than a third exhaust superheat degree threshold value, controlling the first valve to increase the opening degree, otherwise, controlling the first valve to decrease the opening degree; and controlling the second valve to increase the opening degree when the superheat degree of the subcooler is larger than the superheat degree threshold value of the economizer by acquiring the superheat degree of the subcooler, and otherwise, controlling the second valve to decrease the opening degree.
That is to say, according to the control method of the air conditioning system provided by the application, only when the ambient temperature is lower than the ambient temperature threshold value and the starting capability requirement is greater than the starting capability requirement threshold value, the air conditioning system automatically enters the ultralow temperature valve body control method, that is, the ultralow temperature injection enthalpy-increasing valve body control logic is performed, otherwise, the air conditioning system automatically enters the conventional low temperature valve body control method, that is, the conventional low temperature injection enthalpy-increasing valve body control logic is performed.
Specifically, after the ambient temperature is lower than the ambient temperature threshold and reaches the duration threshold, for example, the range of the ambient temperature threshold is less than or equal to 0 ℃, specifically, the ambient temperature threshold is 0 ℃ and the duration threshold is 20 minutes, the starting capability requirement of the indoor unit is obtained, if the starting capability requirement threshold is 30%, if the starting capability requirement is less than or equal to the starting capability requirement threshold, the air conditioning system continues to maintain the conventional low-temperature injection enthalpy-increasing valve body control logic, and if the starting capability requirement is greater than the starting capability requirement threshold, the air conditioning system enters the ultra-low-temperature injection enthalpy-increasing valve body control logic.
Through the control method of the air conditioning system, the control logic of the valve body of the system can be automatically switched according to the running conditions (such as the ambient temperature and the starting capability requirement of an indoor unit) of the air conditioning system, so that the injection quantity of the system can be greatly increased under the condition of ultralow-temperature heating, the circulation quantity of the refrigerant of the system is increased, the heating capability of the air conditioning system is improved under the condition of ensuring the stability of the exhaust superheat degree of the system, the reliability of enhanced vapor injection at the conventional low temperature is realized, the heating capability under the ultralow-temperature environment can be obviously improved, and the control method is suitable for popularization and application.
Specifically, fig. 10 shows a comparison enthalpy-pressure diagram of the air conditioning system including the economizer provided in the present invention and the air conditioning system not including the economizer in the related art, wherein the meanings of the letters and numbers in fig. 10 are as follows: letter a indicates an outlet of an indoor unit of the present invention, letter B indicates an outlet of an economizer of the present invention communicating with an outdoor unit, i.e., a first outlet of the economizer, and letter C indicates an outlet of the economizer of the present invention communicating with a compressor, i.e., a second outlet of the economizer; the letter a' denotes an outlet of the indoor unit in the related art. Numeral 2 indicates a liquid storage device of an air conditioning system provided by the invention, and a liquid storage device of an air conditioning system in the related art; numeral 1' represents an inlet end of the compressor of the present invention communicating with the liquid storage device, and an inlet end of the compressor of the related art communicating with the liquid storage device; numeral 1 "represents one inlet end of the compressor of the present invention communicating with the economizer, and numeral 1 represents the merging end of the two inlet ends (1' and 1") of the compressor of the present invention; numeral 8 denotes an outlet end of a compressor in the present invention, and numeral 8' denotes an outlet end of a compressor of an air conditioning system in the related art; numeral 3 represents an inlet end of the outdoor heat exchanger of the air conditioning system of the present invention communicating with the economizer; numeral 3' represents an inlet end of an outdoor heat exchanger of the air conditioning system in the related art communicated with an indoor unit; the numeral 3 "indicates a line between a second valve in the present invention, which is located between the second outlet of the economizer and the compressor, and the compressor.
As can be seen from the comparison pressure-enthalpy diagram shown in fig. 10, the air conditioning system without the economizer in the related art is a normal heating system, and the flow directions of the refrigerant during the normal heating cycle are sequentially as follows: 2-1'-8' -A '-3' -2, namely, the refrigerant in the air-conditioning system in the related art flows through the liquid storage device 2, the inlet end 1 'of the compressor, the outlet end 8' of the compressor, the outlet A 'of the indoor unit, and the inlet end 3' where the outdoor heat exchanger is communicated with the indoor unit, and then flows back to the liquid storage device 2 through the outdoor heat exchanger, so as to realize the circulation of the refrigerant.
The heating capacity is expressed by the formula (1): q h ＝G′×(h 8’ -h A’ )；
Wherein G' is the refrigerant circulation volume of the heating system in the related technology; h is 8’ Is the enthalpy value, h, of the outlet end 8' of the compressor in the related art A’ Is the enthalpy value at the outlet a' of the indoor unit in the related art.
The air conditioning system provided by the invention comprises an economizer, namely the air conditioning system is a refrigerant-spraying enthalpy-increasing system, and the flow directions of refrigerants in the refrigerant-spraying enthalpy-increasing heating cycle are as follows in sequence: 2- (1' +1"= 1) -8-A- [ (B-3-2) + (C-3" -1 ") ]. The refrigerant in the air conditioning system flows into one inlet end 1 'of the compressor through the liquid storage device 2, is converged with the refrigerant flowing into the other inlet end 1' of the compressor from the second outlet C of the economizer, flows to the outlet end 8 of the compressor through the converging end 1, and then flows to the economizer from the outlet A of the indoor unit.
The heating capacity of the air conditioning system is expressed by the formula (2): q h ＝G×(h 8 -h A )；
Wherein G is the refrigerant circulation quantity of the heating system in the invention; h is 8 Is the enthalpy, h, of the outlet end 8 of the compressor of the invention A Is the enthalpy at the outlet a of the indoor unit of the invention.
In the air conditioning system provided by the invention, the refrigerant circulation quantity G is increased due to the fact that the pressure of a medium-pressure injection port (such as the other inlet end 1') of the compressor is increased, the return air density is increased, and therefore the refrigerant circulation quantity G is also increased, and the problem of liquid compression exists. Therefore, in order to make the circulation amount of the refrigerant enable the system to operate reliably, the return gas density at the merging end 1 of the compressor can be increased by reducing the superheat degree at the other inlet end 1 ″ of the compressor.
Accordingly, the above-described control strategy of the present invention is provided. Based on the fact that the exhaust superheat degree is larger than a first exhaust superheat degree threshold value or the exhaust superheat degree is smaller than a second exhaust superheat degree threshold value, wherein the first exhaust superheat degree threshold value is larger than the second exhaust superheat degree threshold value, it is shown that the quantity of refrigerant flowing into the outdoor heat exchanger through the economizer is too small or too much, the pressure of the current low-pressure side of the air-conditioning system is low, the refrigerant flowing into the outdoor heat exchanger is not facilitated to flow into the compressor, the opening degree is reduced by controlling the first valve, the opening degree is increased by controlling the second valve, the quantity of the refrigerant flowing into the outdoor heat exchanger through the economizer is reduced under the condition that the quantity of the refrigerant flowing out of the compressor outlet is not changed, the quantity of the refrigerant flowing into the compressor through the outdoor heat exchanger is reduced, meanwhile, the quantity of the refrigerant flowing into the compressor through the economizer is increased, a large amount of the refrigerant flows into the compressor through the economizer quickly and smoothly, the circulation quantity of the refrigerant of the system is greatly improved, the heating capacity of the system is improved quickly, and meanwhile, the situation that the compressor liquid is compressed due to the fact that the economizer is excessively sprayed is started and operated under a large load is avoided, the condition, the service life of the compressor is prolonged, and the reliability of the air-conditioning system is improved.
Specifically, the first valve is a solenoid valve or an expansion valve, and the second valve is a solenoid valve or an expansion valve.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more than two, and unless otherwise specifically limited, the terms "upper", "lower", and the like refer to the orientation or positional relationship illustrated in the drawings, merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; the terms "connected", "mounted", "fixed", and the like are to be construed broadly and may include, for example, fixed connections, detachable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A control method of an air conditioning system, characterized in that the air conditioning system comprises: the control method of the air conditioning system comprises the following steps of providing a compressor, an outdoor heat exchanger, an indoor unit, an economizer, a first valve and a second valve, wherein the first valve is arranged between the economizer and the outdoor heat exchanger, the first valve is suitable for adjusting the quantity of refrigerant flowing into the outdoor heat exchanger through the economizer, the second valve is suitable for adjusting the quantity of the refrigerant flowing into the compressor through the economizer, and the control method of the air conditioning system comprises the following steps:
acquiring the ambient temperature of the indoor unit and the starting capability requirement of the indoor unit based on the heating mode;
controlling the working states of the first valve and the second valve according to the environment temperature and the starting-up capacity requirement;
wherein the step of controlling the operating states of the first valve and the second valve according to the ambient temperature and the starting-up capability requirement specifically comprises:
acquiring the exhaust superheat degree based on the condition that the environment temperature is less than a temperature threshold value and the starting capacity requirement is greater than or equal to a starting capacity requirement threshold value;
controlling the working states of the first valve and the second valve according to the exhaust superheat degree;
acquiring the exhaust superheat degree and the superheat degree of the economizer on the basis of the condition that the environment temperature is greater than the temperature threshold value and/or the starting-up capacity requirement is smaller than the starting-up capacity requirement threshold value;
the operating state of the first valve is controlled according to the degree of superheat of the exhaust gas, and the operating state of the second valve is controlled according to the degree of superheat of the economizer.
2. The method as claimed in claim 1, wherein the step of controlling the operating states of the first valve and the second valve according to the degree of superheat of the exhaust gas comprises:
controlling the first valve to reduce the opening degree and controlling the second valve to increase the opening degree based on the exhaust superheat degree being larger than a first exhaust superheat degree threshold value or the exhaust superheat degree being smaller than a second exhaust superheat degree threshold value;
controlling the first valve to maintain the current opening degree and controlling the second valve to maintain the current opening degree on the basis that the exhaust superheat degree is less than or equal to the first exhaust superheat degree threshold value and is greater than or equal to the second exhaust superheat degree threshold value;
wherein the first exhaust superheat threshold is greater than the second exhaust superheat threshold.
3. The control method of the air conditioning system according to claim 2, wherein the step of controlling the operating state of the first valve according to the degree of superheat of the exhaust gas specifically comprises:
controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is larger than a third exhaust superheat degree threshold value;
controlling the first valve to decrease the opening degree based on the condition that the exhaust superheat degree is less than or equal to the third exhaust superheat degree threshold value;
wherein the third exhaust gas superheat threshold is equal to or greater than the first exhaust gas superheat threshold.
4. The control method of an air conditioning system as set forth in claim 3, wherein the step of controlling the operating state of the second valve according to the degree of superheat of the economizer specifically includes:
controlling the second valve to increase the opening degree based on the condition that the superheat degree of the economizer is larger than an economizer superheat degree threshold value;
and controlling the second valve to reduce the opening degree based on the condition that the superheat degree of the economizer is less than or equal to the superheat degree threshold value of the economizer.
5. The control method of an air conditioning system according to claim 4,
the range of the first exhaust superheat degree threshold value is as follows: 15 to 35 ℃;
the range of the second exhaust superheat degree threshold value is as follows: 0 ℃ to 20 ℃;
the range of the third exhaust superheat degree threshold value is as follows: 20 ℃ to 50 ℃;
the range of the superheat degree threshold of the economizer is as follows: 1 ℃ to 10 ℃;
the range of the capacity requirement threshold is as follows: 30% to 50%;
the temperature threshold ranges are: -15 ℃ to 0 ℃.
6. The method according to any one of claims 1 to 5, wherein the step of obtaining the ambient temperature of the indoor unit and the starting capability requirement of the indoor unit specifically includes:
acquiring the ambient temperature of the indoor unit;
timing the time when the environment temperature is smaller than the temperature threshold value based on the condition that the environment temperature is smaller than the temperature threshold value;
and acquiring the starting-up capacity requirement of the indoor unit based on the condition that the duration is greater than or equal to a duration threshold value.
7. An air conditioning system, comprising:
a compressor;
the outdoor heat exchanger is communicated with the inlet end of the compressor;
the indoor unit is communicated with the outlet end of the compressor;
the economizer is communicated with the outdoor heat exchanger and the indoor unit and communicated with the compressor;
a first valve disposed between the economizer and the outdoor heat exchanger, the first valve being configured to adjust an amount of refrigerant flowing into the outdoor heat exchanger through the economizer;
a second valve configured to regulate an amount of refrigerant flowing into the compressor through the economizer;
a memory configured to store a computer program;
a processor configured to execute the computer program to implement the control method of the air conditioning system according to any one of claims 1 to 6.
8. The air conditioning system as claimed in claim 7, wherein the economizer comprises:
a first outlet in communication with the outdoor heat exchanger, the first valve being located between the first outlet and the outdoor heat exchanger;
a second outlet in communication with the compressor;
and the inlet is communicated with the indoor unit.
9. The air conditioning system of claim 8,
the economizer includes a subcooler, the subcooler further includes:
a connection port in communication with the second outlet, the inlet in communication with the first outlet;
wherein the connecting port is communicated with the first outlet, or
And the connecting port is communicated with a pipeline between the indoor unit and the inlet.
10. The air conditioning system of claim 9,
the second valve is arranged between the pipeline between the first outlet and the first valve and the connecting port or between the second outlet and the compressor on the basis that the connecting port is communicated with the first outlet;
based on the connection port is communicated with a pipeline between the indoor unit and the inlet, the second valve is arranged between the pipeline and the connection port, or the second valve is arranged between the second outlet and the compressor.
11. The air conditioning system of claim 10, further comprising:
a first temperature detection device configured to detect a temperature of the second outlet;
a second temperature detection device configured to detect a saturation temperature corresponding to a pressure of the connection port;
wherein a difference between the detected temperature of the first temperature detecting means and the detected temperature of the second temperature detecting means is a degree of superheat of the economizer.
12. The air conditioning system of claim 8,
the economizer includes a flash vessel, the inlet in communication with the first outlet, the inlet in communication with the second outlet;
wherein the second valve is disposed between the second outlet and the compressor.
13. The air conditioning system as claimed in claim 12, further comprising:
a third temperature detection device configured to detect a temperature of the second outlet;
a fourth temperature detection device configured to detect a saturation temperature corresponding to the pressure of the second outlet;
wherein the difference between the temperature detected by the third temperature detecting device and the temperature detected by the fourth temperature detecting device is the superheat degree of the economizer.
14. The air conditioning system as claimed in any one of claims 7 to 13, further comprising:
a fifth temperature detecting means configured to detect a temperature of an outlet end of the compressor or a temperature of an inlet of the indoor unit;
a sixth temperature detection device configured to detect a saturation temperature corresponding to a pressure of a pipe between the compressor and the indoor unit;
and the difference value between the detected temperature of the fifth temperature detection device and the detected temperature of the sixth temperature detection device is the exhaust superheat degree.
15. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, realizes the steps of the control method of an air conditioning system according to any one of claims 1 to 6.
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