CN107883487B - Heat pump air conditioning system, heat pump air conditioner, control method thereof, and storage medium - Google Patents
Heat pump air conditioning system, heat pump air conditioner, control method thereof, and storage medium Download PDFInfo
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- CN107883487B CN107883487B CN201710981469.1A CN201710981469A CN107883487B CN 107883487 B CN107883487 B CN 107883487B CN 201710981469 A CN201710981469 A CN 201710981469A CN 107883487 B CN107883487 B CN 107883487B
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
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Abstract
The invention discloses a heat pump air-conditioning system, which comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device and a first outdoor heat exchanger which are sequentially connected, and further comprises a second outdoor heat exchanger and a second throttling device, wherein the second outdoor heat exchanger is provided with a first flow path and a second flow path, the first flow path of the second heat exchanger is communicated between the indoor heat exchanger and the first throttling device, the inlet end of the first flow path is connected with the indoor heat exchanger, the outlet end of the first flow path is connected with the first throttling device, the second flow path of the second heat exchanger is communicated between the indoor heat exchanger and the compressor, the inlet end of the second flow path is connected with the indoor heat exchanger, and the outlet end of the second flow path is connected with an injection port of the compressor. The invention also provides a heat pump air conditioner, a control method thereof and a storage medium. The invention improves the enthalpy difference value of the first outdoor heat exchanger and the refrigerant circulation amount of the system at low temperature, thereby realizing the improvement of the heating capacity of the system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a heat pump air conditioning system, a heat pump air conditioner, a control method of the heat pump air conditioner and a storage medium.
Background
With the air source heat pump being brought into the renewable energy category by China, the production of the heat pump air conditioner by air conditioner enterprises is increasing day by day. The heat pump air conditioner is an efficient, energy-saving and convenient air conditioning device, plays an important role in daily production and life of people, and therefore, the improvement of the low-temperature heating capacity of the heat pump air conditioner is bound to become an important supporting point for improving the product strength of air conditioner enterprises.
The existing household heat pump air conditioner mainly adopts an air-cooled condenser, when the heat pump air conditioner is used in an environment with low outdoor temperature in winter, the evaporation temperature of a refrigerant is low, moisture in the air is easy to condense into frost on the surface of an evaporator, particularly, the frost phenomenon is easy to occur in an area with high air humidity, and the frost can increase the wind resistance of an outdoor unit, so that the heat transfer coefficient of a heat exchanger is reduced. Along with the reduction of the evaporation temperature, the heating performance coefficient of the heat pump is correspondingly reduced at a certain condensation temperature, so that the utilization rate of heat energy is reduced, and the low-temperature heating capacity of the heat pump air conditioner is insufficient.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a heat pump air-conditioning system, a heat pump air-conditioning device, a control method of the heat pump air-conditioning device and a storage medium, and aims to solve the problem that low-temperature heating energy is insufficient due to low heating performance coefficient and low heat energy utilization rate in the conventional heat pump air-conditioning system.
In order to achieve the above object, the present invention provides a heat pump air conditioning system including a compressor, a four-way valve, an indoor heat exchanger, a first outdoor heat exchanger, a second outdoor heat exchanger, a first throttling device, and a second throttling device, the second outdoor heat exchanger having a first flow path and a second flow path, wherein:
the compressor, the four-way valve, the indoor heat exchanger, the first throttling device and the first outdoor heat exchanger are sequentially connected to form a refrigerant flow path, a first flow path of the second heat exchanger is communicated between the indoor heat exchanger and the first throttling device, the inlet end of the first flow path is connected with the indoor heat exchanger, the outlet end of the first flow path is connected with the first throttling device, a second flow path of the second heat exchanger is communicated between the indoor heat exchanger and the compressor, the inlet end of the second flow path is connected with the indoor heat exchanger, the outlet end of the second flow path is connected with the injection port of the compressor, and the second throttling device is arranged between the indoor heat exchanger and the outlet end of the second flow path.
Preferably, the second throttle device is an electronic expansion valve.
Preferably, the second outdoor heat exchanger is a plate heat exchanger.
In order to achieve the above object, the present invention further provides a control method of a heat pump air conditioner, the control method of the heat pump controller including the steps of:
acquiring the outdoor environment temperature;
judging whether the acquired outdoor environment temperature is lower than a first preset temperature or not;
and when the outdoor environment temperature is lower than the first preset temperature, controlling the electronic expansion valve to be opened to a first opening degree.
Preferably, the step of controlling the electronic expansion valve to open to the first opening degree is further followed by:
when the outdoor environment temperature is lower than the first preset temperature, acquiring the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
and adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger.
Preferably, the adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger includes:
calculating a difference value between the outlet temperature and the inlet temperature of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
acquiring a correction coefficient of a difference value between the inlet temperature and the outlet temperature of the second outdoor heat exchanger;
and calculating a second opening degree of the electronic expansion valve according to the first opening degree, the difference value and the correction coefficient, and adjusting the electronic expansion valve to the second opening degree.
Preferably, the adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger includes:
determining the superheat degree of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
and acquiring a second opening degree of the electronic expansion valve according to the mapping relation between the superheat degree and the opening degree of the electronic expansion valve, and adjusting the electronic expansion valve to the second opening degree.
Preferably, the step of controlling the electronic expansion valve to open to the first opening degree is further followed by:
and when the outdoor environment temperature is higher than the first preset temperature, closing the electronic expansion valve.
In order to achieve the above object, the present invention also provides a heat pump air conditioner including: the system comprises a heat pump air conditioner system, a memory, a processor and a heat pump air conditioner control program which is stored on the memory and can run on the processor; wherein the content of the first and second substances,
the heat pump air-conditioning system is the heat pump air-conditioning system, an electronic expansion valve in the heat pump air-conditioning system is electrically connected with the processor, and the electronic expansion valve is controlled to be opened or closed or adjusted by the processor;
the heat pump air conditioner control program implements the steps of the heat pump air conditioner control method described above when executed by the processor.
In order to achieve the above object, the present invention further provides a storage medium having a heat pump air conditioner control program stored thereon, wherein the heat pump air conditioner control program, when executed by a processor, implements the steps of the control method of the heat pump air conditioner as described above.
According to the heat pump air-conditioning system, the heat pump air-conditioner, the control method of the heat pump air-conditioner and the storage medium, the second outdoor heat exchanger is arranged in the heat pump air-conditioning system and provided with the first flow path and the second flow path, the first flow path is communicated between the indoor heat exchanger and the first throttling device, the second flow path is communicated between the indoor heat exchanger and the compressor, a refrigerant part condensed by the indoor heat exchanger is further cooled through the first flow path, throttled, enters the first outdoor heat exchanger to evaporate and absorb heat and finally flows back into the compressor, and therefore the enthalpy difference value of the first outdoor heat exchanger is improved; after partial throttling, the refrigerant enters the second flow path to be evaporated and absorb heat, and then flows back into the compressor through the injection port, so that the refrigerant circulation quantity of the system at low temperature is improved, and the heating capacity of the system is improved.
Drawings
FIG. 1 is a schematic diagram of the heat pump air conditioning system of the present invention;
FIG. 2 is a schematic diagram of a terminal \ device structure of a hardware operating environment according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a control method of a heat pump air conditioner according to a first embodiment of the present invention;
fig. 4 is a flowchart illustrating a second embodiment of a control method of a heat pump air conditioner according to the present invention;
FIG. 5 is a detailed flowchart of an embodiment of step S50 in FIG. 4;
FIG. 6 is a schematic diagram illustrating a detailed flow of another embodiment of step S50 in FIG. 4;
fig. 7 is a flowchart illustrating a method for controlling a heat pump air conditioner according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides an air-conditioning heat pump system, the heat pump air-conditioning system includes a compressor 10, a four-way valve 20, an indoor heat exchanger 30, a first outdoor heat exchanger 40, a second outdoor heat exchanger 50, a first throttling device 60, and a second throttling device 70, the second outdoor heat exchanger 50 has a first flow path (not labeled) and a second flow path (not labeled), wherein:
the compressor 10, the four-way valve 20, the indoor heat exchanger 30, the first throttling device 60 and the first outdoor heat exchanger 40 are sequentially connected to form a refrigerant flow path, the first flow path of the second heat exchanger is communicated between the indoor heat exchanger 30 and the first throttling device 60, the inlet end of the first flow path is connected with the indoor heat exchanger 30, the outlet end of the first flow path is connected with the first throttling device 60, the second flow path of the second heat exchanger is communicated between the indoor heat exchanger 30 and the compressor 10, the inlet end of the second flow path is connected with the indoor heat exchanger 30, the outlet end of the second flow path is connected with the injection port 110 of the compressor 10, and the second throttling device 70 is arranged between the indoor heat exchanger 30 and the outlet end of the second flow path.
Specifically, the compressor 10 has an exhaust port (not shown), an intake port (not shown), and an injection port 110, the compressor 10, the indoor heat exchanger 30, the first flow path of the second outdoor heat exchanger 50, the indoor heat exchanger 30, the first throttling device 60, and the outdoor heat exchanger are sequentially connected to form a first refrigerant flow path, the refrigerant is compressed by the compressor 10, discharged into the indoor heat exchanger 30 from the exhaust port 110, condensed by the indoor heat exchanger 30, discharged into the first flow path of the second outdoor heat exchanger 50, further condensed by the second outdoor heat exchanger 50, discharged into the first throttling device 60 for throttling, further discharged into the first outdoor heat exchanger 40, and evaporated and heat absorbed in the outdoor heat exchanger, and returned into the compressor 10 from the intake port 120.
The indoor heat exchanger 30, the second throttling device 70, the second flow path of the second outdoor heat exchanger 50, and the compressor 10 are sequentially connected to form a second refrigerant flow path, the refrigerant is compressed by the compressor 10, discharged into the indoor heat exchanger 30 from the discharge port 110, condensed in the indoor heat exchanger 30, partially discharged into the second throttling device 70 for throttling, further discharged into the second flow path of the second outdoor heat exchanger 50, evaporated and released heat through the second flow path of the second outdoor heat exchanger 50, and then returned into the compressor 10 from the injection port 110.
Thus, when the second throttling device 70 is opened, the refrigerant compressed by the compressor 10 passes through the indoor heat exchanger 30 to exchange heat, then passes through the first flow path and the second flow path of the second outdoor heat exchanger 50, part of the refrigerant is evaporated and absorbs heat by the first outdoor heat exchanger 40 and then flows back into the compressor 10, and part of the refrigerant directly returns to the compressor 10 from the injection port 110, part of the refrigerant is condensed by the first flow path of the second outdoor heat exchanger 50 to release heat, and part of the refrigerant is evaporated and absorbs heat by the second flow path of the second outdoor heat exchanger 50, and heat exchange is performed between the first flow path and the second flow path, so that the temperature of the refrigerant flowing to the first throttling device 60 in the first flow path is lower, the enthalpy difference value between the inlet end and the outlet end of the first outdoor heat exchanger 40 is high, and the heating capacity of the system is improved; meanwhile, the refrigerant is divided into two loops to the compressor 10, so that the flow of the circulating refrigerant at low temperature of the system is improved, and the heating capacity of the heat pump air-conditioning system is improved.
More specifically, according to the enhanced vapor injection principle, the injection port 110 of the compressor 10 sucks a part of gas at an intermediate pressure, mixes the gas with a partially compressed refrigerant, and then compresses the gas and the partially compressed refrigerant, so that two-stage compression is realized by a single compressor 10, and a circulating refrigerant flow path is added, thereby greatly improving the heating capacity of the system.
Alternatively, the first throttling device 60 may be a capillary tube, an electronic expansion valve, or another throttling device, and preferably, the second throttling device 70 is an electronic expansion valve, and in this embodiment, the refrigerant flow rate of the second flow path may be controlled by adjusting the opening degree of the electronic expansion valve.
It can be understood that the heat pump air conditioning system in this embodiment may also be applied to a multi-connected heat pump air conditioning system, in the multi-connected heat pump air conditioning system, there are a plurality of indoor heat exchangers 30, a plurality of the indoor heat exchangers 30 are connected in parallel, and each of the indoor heat exchangers 30 is connected to a third throttling device 80, where the third throttling device 80 may be a capillary tube, an electronic expansion valve, or another throttling device, and in the heating mode, the third throttling device 80 on the indoor heat exchanger 30 is in a fully open state, and of course, if part of the indoor heat exchangers 30 do not need to heat, the third throttling device 80 connected to the indoor heat exchanger 30 may be correspondingly closed.
In the technical scheme of the invention, a second outdoor heat exchanger 50 is arranged in a heat pump air-conditioning system, and the second outdoor heat exchanger 50 is provided with a first flow path and a second flow path, wherein the first flow path is communicated between an indoor heat exchanger 30 and a first throttling device 60, the second flow path is communicated between the indoor heat exchanger 30 and a compressor 10, and a refrigerant part condensed by the indoor heat exchanger 30 is further cooled by the first flow path, throttled, enters a first outdoor heat exchanger 40 for evaporation and heat absorption, and finally flows back to the compressor 10, so that the enthalpy difference value of the first outdoor heat exchanger 40 is improved, and the heating capacity is improved; after partial throttling, the refrigerant enters the second flow path to be evaporated and absorb heat, and then flows back to the compressor 10 through the injection port 110, so that the refrigerant circulation amount of the system at low temperature is increased, and the heating capacity of the system is improved.
Preferably, in this embodiment, the second outdoor heat exchanger 50 is a plate heat exchanger, which has the advantages of compact and light structure and small floor area, and the plate heat exchanger is added to the outdoor unit, which is convenient and does not increase the volume of the outdoor unit. In addition, since the second outdoor heat exchanger 50 has the first flow path and the second flow path, a plate heat exchanger is adopted, thin rectangular channels are formed between various plates according to the structural characteristics of the plate heat exchanger, the realization is easy, and heat exchange is performed between the first flow path and the second flow path through the plates, so that the heat exchange efficiency is high, and the heat loss is small.
In the embodiment of the invention, in order to achieve the above purpose, a control method is further provided for controlling working components of a heat pump system to achieve the functions of the heat pump air conditioning system.
The main solution of the embodiment of the invention is as follows: acquiring the outdoor environment temperature; judging whether the acquired outdoor environment temperature is lower than a first preset temperature or not; and when the outdoor environment temperature is lower than the first preset temperature, controlling the electronic expansion valve to be opened to a first opening degree.
Because the heat pump air conditioner in the prior art mainly adopts the air-cooled condenser, when the heat pump air conditioner is used in an environment with low outdoor temperature in winter, the evaporation temperature of a refrigerant is low, moisture in the air is easy to condense into frost on the surface of the evaporator, particularly, the frost phenomenon is easy to occur in an area with high air humidity, and the frost can increase the wind resistance of an outdoor unit, so that the heat transfer coefficient of the heat exchanger is reduced. Along with the reduction of the evaporation temperature, the heating performance coefficient of the heat pump is correspondingly reduced at a certain condensation temperature, so that the utilization rate of heat energy is reduced, and the low-temperature heating capacity of the heat pump air conditioner is insufficient.
According to the solution provided by the invention, when the outdoor environment temperature value of the heat pump air conditioner is lower than a first preset temperature, the electronic expansion valve is controlled to be opened to a first opening degree, so that part of a refrigerant is further cooled and throttled by a first flow path of the second outdoor heat exchanger and then discharged into the first outdoor heat exchanger, then the refrigerant is evaporated and absorbed heat in the first outdoor heat exchanger and flows back into the compressor, and the other part of the refrigerant is discharged and throttled by the indoor heat exchanger, then flows into the second flow path to be evaporated and absorbed heat and flows back into the compressor through the jet hole.
As shown in fig. 2, fig. 2 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention can be an air conditioner, and can also be terminal equipment such as an intelligent controller and the like.
As shown in fig. 2, the terminal may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the terminal configuration shown in fig. 2 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. For example, the terminal may further include sensors, such as temperature sensors, and the like, and specifically, the temperature sensors are distributed at the air return opening of the outdoor unit, the outlet end, the inlet end, and the like of the second outdoor heat exchanger, and are all electrically connected to the processor 1001, and the temperature sensed by the temperature sensors is transmitted to the processor 1001 for processing by the processor 1001.
As shown in fig. 2, the memory 1005, which is one type of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a heat pump air conditioner control application.
In the terminal shown in fig. 2, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the heat pump air conditioning control application stored in the memory 1005 and perform the following operations:
acquiring the outdoor environment temperature;
judging whether the acquired outdoor environment temperature is lower than a first preset temperature or not;
and when the outdoor environment temperature is lower than the first preset temperature, controlling the electronic expansion valve to be opened to a first opening degree.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
when the outdoor environment temperature is lower than the first preset temperature, acquiring the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
and adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
calculating a difference value between the outlet temperature and the inlet temperature of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
acquiring a correction coefficient of a difference value between the inlet temperature and the outlet temperature of the second outdoor heat exchanger;
and calculating a second opening degree of the electronic expansion valve according to the first opening degree, the difference value and the correction coefficient, and adjusting the electronic expansion valve to the second opening degree.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
determining the superheat degree of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
and acquiring a mapping relation between the superheat degree and the opening degree of the electronic expansion valve, acquiring a second opening degree of the electronic expansion valve, and adjusting the electronic expansion valve to the second opening degree.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
and when the outdoor environment temperature is higher than the first preset temperature, closing the electronic expansion valve.
Referring to fig. 3, a first embodiment of a method for controlling a heat pump air conditioner according to the present invention includes:
step S10, acquiring outdoor environment temperature;
in the embodiment of the invention, the heat pump air conditioner comprises an indoor unit and an outdoor unit, wherein a temperature sensor is arranged at an air return inlet of the outdoor unit so as to detect the outdoor environment temperature of the heat pump air conditioner in real time. It will be appreciated that a temperature sensor for sensing the outdoor ambient temperature may also be provided on the outer surface of the outdoor unit housing.
Step S20, determining whether the acquired outdoor ambient temperature is lower than a first preset temperature;
when the heat pump air conditioner is used in an environment with low outdoor temperature in winter, the refrigerant evaporates and absorbs heat to enable the temperature of the first outdoor heat exchanger to be low, moisture in air is easy to form frost on the surface of the first outdoor heat exchanger, and when the frost is formed on the surface of the first outdoor heat exchanger, the heating performance of the heat pump air conditioning system can be affected. The first preset temperature is a critical temperature of an outdoor environment where frost is formed on the surface of a first outdoor heat exchanger preset by the system, that is, when the outdoor environment temperature is lower than the critical temperature, frost is easily formed on the surface of the first outdoor heat exchanger, and when the outdoor environment temperature is higher than the critical temperature, frost is not easily formed on the surface of the first outdoor heat exchanger, so that the outdoor environment temperature is monitored in real time, when the outdoor environment temperature is lower than the first preset temperature, the heating performance of the system is improved by adopting the mode of step S30, and when the outdoor environment temperature is higher than the first preset temperature, the initial closing state of the electronic expansion valve is maintained.
In this embodiment, the first preset temperature may preferably be 2 ℃.
And step S30, when the outdoor ambient temperature is lower than the first preset temperature, controlling the electronic expansion valve to open to a first opening degree.
In the heating process of the heat pump air conditioner, when the outdoor environment temperature is higher than the first preset temperature, because the first outdoor heat exchanger is not easy to frost, the heating performance of the system is not affected, at the moment, a second throttle valve connected with the second flow path on the second outdoor heat exchanger can be closed, namely, an electronic expansion valve which is positioned at the inlet end of the second flow path and communicated with the second flow path is controlled to be in a closed state, and a refrigerant flows out of the indoor heat exchanger, does not exchange heat through the second flow path, but directly flows through the first flow path for heat exchange, and then is throttled to enter the first outdoor heat exchanger.
When the detected outdoor environment temperature is lower than the first preset temperature, the surface of the first outdoor heat exchanger is easy to frost, and the heating performance of the system is affected at the moment, so that the electronic expansion valve is controlled to be opened to a first opening degree, part of refrigerant flowing out of the indoor heat exchanger is throttled and then enters the second flow path for heat exchange, the refrigerant directly flows back into the compressor through the injection port of the compressor, the rest of the refrigerant is further throttled through the first flow path and then enters the first outdoor heat exchanger for evaporation and heat absorption, and finally the refrigerant flows back into the compressor, so that the low-temperature heating quantity of the system is improved by increasing the enthalpy difference value of the inlet end and the outlet end of the first outdoor heat exchanger and increasing the circulating flow of the low-temperature heating refrigerant, and the heating capacity of the system is improved.
The first opening degree is a preset initial opening degree which needs to be opened when the electronic expansion valve reaches the opening degree, and when the opening degree of the electronic expansion valve is opened to the first opening degree, the heating performance of the system can be greatly improved. Preferably, the first opening degree may be 50 steps, but is not limited to 50 steps, and may be specifically set according to the environment where the heat pump air conditioner is located.
In this embodiment, when the outdoor environment temperature value of the heat pump air conditioner is lower than a first preset temperature, the electronic expansion valve is controlled to be opened to a first opening degree, so that part of the refrigerant is further cooled and throttled by the first flow path of the second outdoor heat exchanger and then discharged into the first outdoor heat exchanger, the refrigerant is evaporated and absorbed in the first outdoor heat exchanger and then flows back into the compressor, and the other part of the refrigerant is discharged and throttled by the indoor heat exchanger and then flows into the second flow path to be evaporated and absorbed in the second flow path and then flows back into the compressor through the injection hole.
Further, referring to fig. 4, a second embodiment of the method for controlling a heat pump air conditioner according to the present invention is based on the embodiment shown in fig. 3, wherein the step of controlling the electronic expansion valve to open to the first opening degree in step S30 further includes:
step S40, when the outdoor ambient temperature is lower than the first preset temperature, acquiring an outlet temperature and an inlet temperature of the second outdoor heat exchanger;
in this embodiment, temperature sensors are respectively disposed at an outlet end and an inlet end of a second outdoor heat exchanger of the heat pump air conditioner, so as to detect the temperature of the second outdoor heat exchanger in real time.
And step S50, adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger.
In order to optimize heating capacity, after the electronic expansion valve is opened, the opening degree of the electronic expansion valve is adjusted according to the temperature of the outlet end and the inlet end of the second outdoor heat exchanger detected in real time, wherein the adjustment mode is that the opening degree of the electronic expansion valve is increased on the basis of the first opening degree, or the opening degree of the electronic expansion valve is decreased on the basis of the first opening degree.
Referring to fig. 5, the adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger includes:
step S51, calculating the difference between the outlet temperature and the inlet temperature of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
step S52, obtaining a correction coefficient of the difference between the temperature inlet and the temperature outlet of the second outdoor heat exchanger;
step S53, calculating a second opening degree of the electronic expansion valve according to the first opening degree, the difference value and the correction coefficient, and adjusting the electronic expansion valve to the second opening degree.
In this embodiment, a correction coefficient of a difference between an outlet temperature and an inlet temperature of the second outdoor heat exchanger is preset, the opening degree to be adjusted is obtained by multiplying the temperature difference by the correction coefficient, and the opening degree to be adjusted is added to the first opening degree, so as to obtain a second opening degree of the electronic expansion valve corresponding to the difference between the outlet temperature and the inlet temperature, and the second opening degree of the electronic expansion valve is specifically:
an optimal second opening degree, P ═ P0+ (T2-T1) × K, of the electronic expansion valve at a current second outdoor heat exchanger outlet temperature and inlet temperature differential;
wherein, P0 is the initial opening of the electronic expansion valve, P0 can take 50 steps; t2 is the second outdoor heat exchanger outlet temperature; t1 is the second outdoor heat exchanger inlet temperature; k is a correction coefficient, and can be 1.2-1.5. The scope of the present invention encompasses any suitable direct relationship between the opening of the electronic expansion valve and the temperature differential.
It is understood that, in this embodiment, an adjusted opening degree of the electronic expansion valve may also be determined according to the first opening degree, the difference value and the correction factor, the electronic expansion valve is adjusted according to the adjusted opening degree on the basis of the first opening degree, for example, it is determined that the electronic expansion valve needs to increase or decrease Δ P, the electronic expansion valve is controlled to increase or decrease Δ P step on the basis of the first opening degree, and a sum of the first opening degree and Δ P is the second opening degree of the adjusted electronic expansion valve.
Further, when the difference between the outlet temperature and the inlet temperature of the second outdoor heat exchanger is within 3-5 ℃, the electronic expansion valve adopts the first opening degree as the optimum opening degree, so that the opening degree of the electronic expansion valve is adjusted only when the difference between the T2 and the T1 is lower than 3 ℃ or higher than 5 ℃, specifically, the opening degree of the electronic expansion valve is reduced when the difference between the T2 and the T1 is lower than 3 ℃, and the opening degree of the electronic expansion valve is increased when the difference between the T2 and the T1 is higher than 5 ℃.
Referring to fig. 6, the adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger may further include:
step S54, determining the superheat degree of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
and step S55, acquiring a second opening degree of the electronic expansion valve according to the mapping relation between the superheat degree and the opening degree of the electronic expansion valve, and adjusting the electronic expansion valve to the second opening degree.
In this embodiment, the superheat degree is a difference between an outlet temperature and an inlet temperature of the second outdoor heat exchanger, different opening degrees are preset for the electronic expansion valve according to a possible difference between the outlet temperature and the inlet temperature of the second outdoor heat exchanger, and a mapping relationship is established between the opening degrees and the difference (superheat degree). When the outlet temperature and the inlet temperature of the second outdoor heat exchanger are obtained, the difference value of the outlet temperature and the inlet temperature is calculated, a second opening corresponding to the difference value is obtained according to the mapping relation between the difference value and the opening of the electronic expansion valve, and then the electronic expansion valve is adjusted to the second opening.
Or dividing a plurality of difference intervals according to the difference possibly existing between the outlet temperature and the inlet temperature of the second outdoor heat exchanger, presetting different opening degrees for the electronic expansion valve, and establishing a mapping relation with the difference intervals. When the outlet temperature and the inlet temperature of the second outdoor heat exchanger are obtained, the difference value of the outlet temperature and the inlet temperature is calculated, a preset difference value interval where the difference value is located is determined, a second opening corresponding to the difference value interval is obtained according to the mapping relation between the difference value interval and the opening of the electronic expansion valve, and then the electronic expansion valve is adjusted to the second opening.
In this embodiment, the opening degree of the electronic expansion valve is properly adjusted according to the inlet temperature and the outlet temperature by monitoring the inlet temperature and the outlet temperature of the second outdoor heat exchanger in real time, so that the flow rate of the refrigerant in the second flow path is controlled to be within a reasonable range, instability of the system due to an excessively large or excessively small flow path is avoided, and the low-temperature heating capacity is optimized by controlling the flow rate of the refrigerant in the second flow path to be within a proper range.
In addition, it is understood that controlling the electronic expansion valve to open to the first opening degree may further include: when the outdoor environment temperature is lower than the first preset temperature, acquiring the outlet temperature and the inlet temperature of a second flow path of the second outdoor heat exchanger, wherein temperature sensors are arranged at the outlet end and the inlet end of the second flow path; and adjusting the opening degree of the electronic expansion valve according to the outlet temperature and the inlet temperature of the second flow path of the second outdoor heat exchanger.
The difference between this embodiment and the second embodiment is that the opening degree of the electronic expansion valve is adjusted according to the superheat degree of the second flow path outlet in this embodiment, and other adjustment manners are the same as those of the second embodiment, which are not repeated herein.
Further, referring to fig. 7, a third embodiment of the method for controlling a heat pump air conditioner according to the present invention is based on any one of the embodiments shown in fig. 3 to 6, wherein the step of controlling the electronic expansion valve to be opened to the first opening degree in step S30 further includes:
and step S60, when the outdoor environment temperature is higher than the first preset temperature, closing the electronic expansion valve.
In this embodiment, when the outdoor ambient temperature is higher than the first preset temperature, the surface of the first outdoor heat exchanger is not prone to frost condensation, and the heating performance of the heat pump air conditioning system is not affected at this time, and at this time, the electronic expansion valve may be optionally closed, so that the system exchanges heat only through the first flow path, and the control of the system and the working mode of the compressor are simplified.
The invention also provides a heat pump air conditioner, which comprises a heat pump air conditioning system, a memory, a processor and a heat pump air conditioner control program which is stored on the memory and can run on the processor, wherein the heat pump air conditioning system is the heat pump air conditioning system, an electronic expansion valve in the heat pump air conditioning system is electrically connected with the processor, and the opening, closing or adjustment of the electronic expansion valve is controlled by the processor.
The heat pump air conditioner control program implements the respective steps of the heat pump air conditioner control method as described above when executed by the processor.
The present invention also provides a storage medium having a control program for a heat pump air conditioner stored thereon, wherein the control program for a heat pump air conditioner, when executed by a processor, implements the steps of the control method for a heat pump air conditioner as described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A control method of a heat pump air conditioner is used for controlling a heat pump air conditioning system and is characterized in that, the heat pump air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device and a first outdoor heat exchanger which are sequentially connected to form a refrigerant flow path, the heat pump air conditioning system further includes a second outdoor heat exchanger having a first flow path and a second flow path, the inlet end of the first flow path is connected with the indoor heat exchanger, the outlet end of the first flow path is connected with the first throttling device, an inlet end of the second flow path is connected with the indoor heat exchanger, an outlet end of the second flow path is connected with an injection port of the compressor, the second throttling device is arranged at the inlet end of the second flow path and is an electronic expansion valve;
the control method of the heat pump air conditioner comprises the following steps:
acquiring the outdoor environment temperature;
judging whether the acquired outdoor environment temperature is lower than a first preset temperature or not;
when the outdoor environment temperature is lower than the first preset temperature, controlling the electronic expansion valve to be opened to a first opening degree;
when the outdoor environment temperature is lower than the first preset temperature, acquiring the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
calculating a difference value between the outlet temperature and the inlet temperature of the second outdoor heat exchanger according to the outlet temperature and the inlet temperature of the second outdoor heat exchanger;
acquiring a correction coefficient of a difference value between the inlet temperature and the outlet temperature of the second outdoor heat exchanger;
and determining the opening degree adjustment size according to the product of the difference value and the correction coefficient, determining the second opening degree of the electronic expansion valve according to the first opening degree and the opening degree adjustment size, and adjusting the electronic expansion valve to the second opening degree.
2. The method of controlling a heat pump air conditioner according to claim 1, wherein the step of controlling the electronic expansion valve to be opened to the first opening degree is followed by further comprising:
and when the outdoor environment temperature is higher than the first preset temperature, closing the electronic expansion valve.
3. A heat pump air conditioner, characterized in that the heat pump air conditioner comprises: the heat pump air conditioner control system comprises a memory, a processor and a heat pump air conditioner control program which is stored on the memory and can run on the processor;
the heat pump air conditioner control program, when executed by the processor, implements the steps of the control method of the heat pump air conditioner according to any one of claims 1 or 2.
4. A storage medium, characterized in that a heat pump air conditioner control program is stored thereon, which when executed by a processor implements the steps of the control method of a heat pump air conditioner according to any one of claims 1 or 2.
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| CN109458683B (en) * | 2018-10-16 | 2021-01-22 | 宁波工程学院 | Dry type radiation heat pump and unit type household air conditioner all-in-one machine and control method thereof |
| CN110388776B (en) * | 2019-08-01 | 2020-07-07 | 珠海格力电器股份有限公司 | Operation control method and equipment for low-temperature refrigerant heating equipment |
| CN113899121A (en) * | 2021-09-19 | 2022-01-07 | 青岛海尔空调器有限总公司 | Liquid separator, heat exchanger, refrigeration cycle system and air conditioner |
| CN113834150B (en) * | 2021-09-27 | 2022-09-27 | 广东美的制冷设备有限公司 | Multi-online heat pump system, control method thereof and computer readable storage medium |
| CN113883608B (en) * | 2021-10-14 | 2023-03-17 | 青岛海信日立空调***有限公司 | Outdoor unit of multi-connected unit |
| CN114543296A (en) * | 2021-12-24 | 2022-05-27 | 青岛海尔空调电子有限公司 | Method and device for controlling embedding machine and embedding machine |
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| CN102022853A (en) * | 2010-11-18 | 2011-04-20 | 海尔集团公司 | Air conditioner system |
| JP2013178020A (en) * | 2012-02-28 | 2013-09-09 | Yanmar Co Ltd | Air conditioner that has cooling tower |
| CN105066526B (en) * | 2015-07-15 | 2017-05-03 | 广东美的暖通设备有限公司 | Air supplying and enthalpy increasing method and system for air conditioner and air conditioner |
| CN205102288U (en) * | 2015-10-27 | 2016-03-23 | 广东美的暖通设备有限公司 | Enhanced vapor injection air conditioning system |
| CN105737459A (en) * | 2016-04-13 | 2016-07-06 | 广东美芝制冷设备有限公司 | Air conditioner |
| CN106288488B (en) * | 2016-08-29 | 2019-02-01 | 广东美的暖通设备有限公司 | The control method of air-conditioner system and air-conditioner system |
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