Control method, controller, air conditioner, and storage medium for air conditioner

Abstract

Embodiments of the present application provide a control method, a controller, an air conditioner and a storage medium for the air conditioner. The air conditioner comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger and a supercooling device. The supercooling device comprises a supercooling heat exchanger and a supercooling expansion valve. The supercooling heat exchanger comprises a main path channel and an auxiliary path channel. The control method comprises: obtaining an exhaust temperature of the compressor in a refrigeration mode or a dehumidification mode; opening the supercooling expansion valve when the exhaust temperature is greater than or equal to a first preset temperature; detecting an auxiliary path superheat degree of the auxiliary path channel; and adjusting an opening degree of the supercooling expansion valve according to the auxiliary path superheat degree. The embodiments of the present application reduce the exhaust temperature of the compressor by using the intermediate jet cooling control method of the jet augmenting compressor, effectively reduce the exhaust temperature and have a good effect on improving the system performance. Compared with the suction side liquid cooling technology, the intermediate jet cooling control method can reduce the risk of liquid knock.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a control method of an air conditioner, a controller, an air conditioner and a storage medium. BACKGROUND

[0002] In the related art, when the air conditioner runs in a high-temperature environment, the compression ratio and load of the compressor increase. At the same time, the increase of the compression ratio means that the exhaust temperature of the compressor increases at the same evaporation temperature, which deteriorates the lubrication performance, and even causes carbonization of lubricating oil and cylinder pulling of the compressor, affecting the service life of the unit.

[0003] To solve the problem of high exhaust temperature caused by running in a high-temperature environment, the existing solution is to reduce the exhaust temperature by reducing the suction superheat or suction liquid carrying of the compressor. However, reducing the exhaust temperature by carrying liquid may cause damage to the compressor. Specifically, if liquid is carried into the compression chamber of the compressor during operation of the compressor, and the compressor does not use flexible technology, due to the incompressibility of the liquid, the liquid will be subjected to strong impact in the compression chamber due to the forced action of the piston or the scroll plate, which may cause damage to the compressor. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a control method of an air conditioner, a controller, an air conditioner and a storage medium, which aims to reduce the exhaust temperature of the compressor and improve the reliability of the unit operation.

[0005] In a first aspect, the embodiments of the present application provide a control method of an air conditioner, the air conditioner comprising a compressor, an outdoor heat exchanger, an indoor heat exchanger and a subcooling device, the subcooling device comprising a subcooling heat exchanger and a subcooling expansion valve, the subcooling heat exchanger comprising a main path and an auxiliary path, an inlet of the main path being communicated to the outdoor heat exchanger, an outlet of the main path being communicated to a return port of the compressor, an inlet of the auxiliary path being communicated to a refrigerant pipeline between the outlet of the main path and the indoor heat exchanger through the subcooling expansion valve, and an outlet of the auxiliary path being communicated to an enthalpy-increasing port of the compressor; the control method comprising: in a cooling mode or a dehumidifying mode, acquiring an exhaust temperature of the compressor; when the exhaust temperature is greater than or equal to a first preset temperature, opening the subcooling expansion valve; detecting an auxiliary path superheat of the auxiliary path, and adjusting an opening degree of the subcooling expansion valve according to the auxiliary path superheat.

[0006] According to some embodiments of the present application, when the exhaust temperature is greater than or equal to the first preset temperature, the subcooling expansion valve is opened, comprising: when the exhaust temperature is greater than or equal to the first preset temperature and lasts for a first preset time length, opening the opening degree of the subcooling expansion valve to a preset initial opening degree.

[0007] According to some embodiments of the present application, the detecting the subcooling degree of the subcooling passage comprises: obtaining an outlet refrigerant temperature and an inlet refrigerant temperature of the subcooling passage; and determining the subcooling degree of the subcooling passage according to the outlet refrigerant temperature and the inlet refrigerant temperature.

[0008] According to some embodiments of the present application, the adjusting the opening degree of the subcooling expansion valve according to the subcooling degree comprises one of: when the subcooling degree is less than a first preset subcooling degree, reducing the opening degree of the subcooling expansion valve by a first preset step length every preset period; when the subcooling degree is greater than or equal to the first preset subcooling degree and less than or equal to a second preset subcooling degree, keeping the opening degree of the subcooling expansion valve unchanged; and when the subcooling degree is greater than the second preset subcooling degree, obtaining an operating current of the air conditioner and adjusting the opening degree of the subcooling expansion valve according to the operating current.

[0009] According to some embodiments of the present application, the adjusting the opening degree of the subcooling expansion valve according to the operating current comprises one of: when the operating current is less than a first preset current, increasing the opening degree of the subcooling expansion valve by a second preset step length every preset period; when the operating current is greater than or equal to the first preset current and less than or equal to a second preset current, increasing the opening degree of the subcooling expansion valve by a third preset step length every preset period, wherein the third preset step length is less than the second preset step length; and when the operating current is greater than the second preset current, keeping the opening degree of the subcooling expansion valve unchanged.

[0010] According to some embodiments of the present application, the first preset current is obtained by: obtaining a compressor limit frequency current and a first proportion parameter, and taking a product value of the compressor limit frequency current and the first proportion parameter as the first preset current; and the second preset current is obtained by: obtaining a compressor limit frequency current and a second proportion parameter, and taking a product value of the compressor limit frequency current and the second proportion parameter as the second preset current, wherein the second proportion parameter is greater than the first proportion parameter.

[0011] According to some embodiments of the present application, after the obtaining the discharge temperature of the compressor, the control method further comprises: when the discharge temperature is less than a second preset temperature and lasts for a second preset time length, closing the subcooling expansion valve.

[0012] According to some embodiments of the present application, the air conditioner further comprises an enthalpy injection on-off valve, which is arranged between an outlet of the subcooling passage and an enthalpy increasing port of the compressor; and in the cooling mode or the dehumidifying mode, the control method further comprises: opening the enthalpy injection on-off valve.

[0013] In a second aspect, the embodiments of the present application provide a controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to perform the control method of the air conditioner according to the first aspect.

[0014] In a third aspect, the embodiments of the present application provide an air conditioner, comprising the controller according to the second aspect.

[0015] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, storing computer executable instructions for performing the control method of the air conditioner according to the first aspect.

[0016] According to the technical scheme of the embodiments of the present application, at least the following beneficial effects are achieved: the air conditioner according to the embodiments of the present application comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a supercooling device, the supercooling device comprises a supercooling heat exchanger and a supercooling expansion valve, the supercooling heat exchanger comprises a main path channel and an auxiliary path channel, an inlet of the main path channel is connected to the outdoor heat exchanger, an outlet of the main path channel is connected to a back gas port of the compressor, an inlet of the auxiliary path channel is connected to a refrigerant pipeline between the outlet of the main path channel and the indoor heat exchanger through the supercooling expansion valve, and an outlet of the auxiliary path channel is connected to an enthalpy-increasing port of the compressor; in the refrigeration mode or the dehumidification mode, the embodiments of the present application acquire the exhaust temperature of the compressor; when the exhaust temperature is greater than or equal to a first preset temperature, the embodiments of the present application open the supercooling expansion valve; then, the embodiments of the present application detect the auxiliary path superheat degree of the auxiliary path channel, and adjust the opening degree of the supercooling expansion valve according to the auxiliary path superheat degree. Since the embodiments of the present application can reduce the exhaust temperature of the compressor based on the intermediate jet cooling control method of the jet-in enthalpy-increasing compressor, the exhaust temperature is effectively reduced, the system performance is also effectively improved, and the risk of liquid knock can be reduced compared with the suction side liquid injection cooling technology. In addition, the embodiments of the present application further increase the auxiliary path superheat degree judgment to control the opening degree of the supercooling expansion valve, so as to ensure that the refrigerant entering the enthalpy-increasing port has a certain appropriate superheat degree, thereby effectively preventing liquid return in the air supplementing process, and improving the reliability of the compressor. Therefore, the embodiments of the present application can effectively reduce the exhaust temperature of the compressor under the premise of strong refrigeration of the unit in a high-temperature environment, so that the unit can reliably and stably operate.

[0017] Additional aspects and advantages of the application will be set forth in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the technical scheme of the application, and constitute a part of the specification, and are used together with the embodiments of the application to explain the technical scheme of the application, and do not constitute a limitation on the technical scheme of the application.

[0019] Figure 1 is a system schematic diagram of an air conditioner provided by an embodiment of the present application;

[0020] Figure 2 is a flowchart of a control method of an air conditioner provided by an embodiment of the present application;

[0021] Figure 3 is a flowchart of a control method of an air conditioner provided by another embodiment of the present application;

[0022] Figure 4 is Figure 2 is a specific flowchart of the step of detecting the auxiliary road overheating degree of the auxiliary road passage in the control method of the air conditioner provided by the embodiment;

[0023] Figure 5 is a whole flowchart of a control method of an air conditioner provided by an embodiment of the present application;

[0024] Figure 6 is a structure schematic diagram of a controller for executing the control method of the air conditioner provided by an embodiment of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be understood as limiting the present application.

[0026] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second, etc. are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0028] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0029] In some cases, when an air conditioner is running in a high-temperature environment, the compression ratio and load of the compressor increase. At the same evaporation temperature, the increase in compression ratio means that the compressor exhaust temperature rises, the lubrication performance deteriorates, and even the lubricating oil carbonization and compressor cylinder scoring may occur, affecting the life of the unit.

[0030] To address the issue of excessively high exhaust temperatures caused by refrigeration operation in high-temperature environments, existing solutions involve reducing the compressor's suction superheat or allowing liquid to enter the suction, thereby lowering the exhaust temperature. However, reducing the exhaust temperature by allowing liquid to enter may damage the compressor. Specifically, if liquid is introduced into the compressor's compression chamber during operation, and the compressor does not employ flexible technology, the incompressibility of the liquid will cause strong impacts due to the forced action of the piston or scroll plate within the compression chamber, potentially damaging the compressor.

[0031] Based on the above, this application proposes a control method, controller, air conditioner, and storage medium for an air conditioner, aiming to reduce the exhaust temperature of the compressor and improve the reliability of the unit operation.

[0032] The various embodiments of the air conditioner control method of this application will be further described below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, Figure 1 This is a schematic diagram of an air conditioner system provided in one embodiment of this application.

[0034] In one embodiment, the air conditioner includes a compressor 100, an outdoor heat exchanger 200, an indoor heat exchanger 300, and a subcooling device 400.

[0035] Specifically, the subcooling device 400 includes a subcooling heat exchanger 410 and a subcooling expansion valve 420. The subcooling heat exchanger 410 includes a main channel and an auxiliary channel. The inlet of the main channel is connected to the outdoor heat exchanger 200, and the outlet of the main channel is connected to the return port of the compressor 100. The inlet of the auxiliary channel is connected through the subcooling expansion valve 420 to the refrigerant pipeline between the outlet of the main channel and the indoor heat exchanger 300, and the outlet of the auxiliary channel is connected to the enthalpy-increasing port of the compressor 100.

[0036] Specifically, in cooling or dehumidifying mode, the compressor 100 draws refrigerant from the indoor heat exchanger 300, compresses it, and sends it to the outdoor heat exchanger 200 for condensation. Then, the outdoor heat exchanger 200 dissipates heat into the air. The refrigerant then flows from the outdoor heat exchanger 200 to the indoor heat exchanger 300 for evaporation and absorbs heat from the air through the indoor heat exchanger 300, thus regulating and cooling the air.

[0037] Specifically, when the subcooling expansion valve 420 of the subcooling device 400 is closed, the refrigerant flows to the indoor heat exchanger 300 through the main channel of the subcooling device 400; when the subcooling expansion valve 420 of the subcooling device 400 is open, the refrigerant flows to the enthalpy-increasing port of the compressor 100 through the auxiliary channel of the subcooling device 400. By closing and opening the subcooling expansion valve 420, the refrigerant entering the enthalpy-increasing port can be guaranteed to have a certain appropriate superheat, thereby effectively preventing liquid return during the gas replenishment process and improving the reliability of the compressor.

[0038] It should be noted that the main road and the auxiliary road can be parallel to each other or intersect each other; this embodiment does not impose specific limitations on them.

[0039] Understandably, when the main and auxiliary channels intersect, the auxiliary channels can better absorb the heat from the main channels, thereby increasing the outlet temperature of the auxiliary channels and increasing the superheat of the auxiliary channels, which in turn reduces the exhaust temperature of the air conditioner, enabling the unit to operate reliably and stably.

[0040] Understandably, the enthalpy inlet is an interface or hole in an air conditioner used to connect the pipe between the outdoor heat exchanger 200 and the indoor heat exchanger 300, and is used to heat or cool the air. By adjusting the switch of the enthalpy inlet or adjusting the size of the enthalpy inlet, the temperature and humidity in the air can be controlled.

[0041] In one embodiment, the air conditioner further includes an enthalpy injection switch valve 500, which is disposed between the outlet of the auxiliary channel and the enthalpy injection port of the compressor 100.

[0042] Specifically, the enthalpy injection switch valve 500 is used to control the flow of refrigerant. By opening or closing the enthalpy injection switch valve 500, the flow rate of refrigerant is adjusted, thereby controlling the regulation and maintenance of indoor temperature. When the air conditioning system is in cooling or dehumidification mode, the enthalpy injection switch valve 500 will open, allowing the refrigerant to flow from the auxiliary channel of the subcooling heat exchanger 410 to the enthalpy-increasing port of the compressor 100, absorbing the heat of the main channel, reducing the exhaust temperature of the compressor, and enabling the unit to operate reliably and stably.

[0043] like Figure 2 As shown, Figure 2 This is a flowchart of a control method for an air conditioner provided in one embodiment of this application. The control method for the air conditioner may include, but is not limited to, steps S210 to S230.

[0044] Step S210: In cooling mode or dehumidification mode, obtain the compressor's exhaust temperature;

[0045] Step S220: When the exhaust temperature is greater than or equal to the first preset temperature, open the subcooling expansion valve;

[0046] Step S230: Detect the overheat of the auxiliary road channel and adjust the opening of the subcooling expansion valve according to the overheat of the auxiliary road.

[0047] Specifically, after the air conditioner is turned on, the operating mode is first determined. When the air conditioner is in cooling or dehumidifying mode, the compressor's exhaust temperature is detected. Then, the detected exhaust temperature is compared with a first preset temperature to determine their relative values. If the exhaust temperature is greater than or equal to the first preset temperature, the subcooling expansion valve is opened. Finally, the auxiliary superheat in the auxiliary circuit of the subcooling heat exchanger is detected, and the opening of the subcooling expansion valve is adjusted according to the detected auxiliary superheat. Because this embodiment controls the opening of the subcooling expansion valve by judging the auxiliary superheat, it ensures that the refrigerant entering the enthalpy inlet has a suitable superheat, thereby effectively preventing liquid return during the gas replenishment process and improving the compressor's reliability. Therefore, this embodiment can effectively reduce the compressor's exhaust temperature while providing strong cooling in high-temperature environments, ensuring reliable and stable operation of the unit.

[0048] It should be noted that when the compressor's discharge temperature is too high, it will lead to a decrease in system efficiency. This is because high temperatures increase the viscosity and friction loss of the refrigerant, thereby reducing energy conversion efficiency. In addition, high discharge temperatures require more electrical energy to maintain stable operation, increasing system energy consumption. Furthermore, high discharge temperatures can damage the compressor. Moreover, high discharge temperatures will lead to a decrease in cooling effect, as the high-temperature gas discharged by the compressor will affect the condensation process in the refrigeration cycle, preventing the condenser from dissipating heat sufficiently, thus reducing the cooling effect.

[0049] It should be noted that when the exhaust temperature is greater than or equal to the first preset temperature, i.e. the exhaust temperature is high, the exhaust temperature is reduced by opening the subcooling expansion valve, thereby reducing damage to the compressor and ensuring reliable and stable operation of the unit.

[0050] It should be noted that the opening of the subcooling expansion valve is adjusted according to the superheat of the auxiliary circuit. That is, the flow rate of refrigerant through the subcooling expansion valve is controlled by adjusting the opening of the subcooling expansion valve, and the opening of the subcooling expansion valve is directly proportional to the flow rate of refrigerant through the subcooling expansion valve.

[0051] like Figure 3 As shown, Figure 3 This is a flowchart of a control method for an air conditioner provided in another embodiment of this application. The control method of this application embodiment may include, but is not limited to, steps S310 to S320.

[0052] Step S310: When the exhaust temperature is greater than or equal to the first preset temperature and continues for the first preset duration;

[0053] Step S320, open the opening degree of the supercooling expansion valve to a preset initial opening degree.

[0054] Specifically, after the air conditioner is turned on, firstly, it is judged what kind of operation mode the air conditioner is in; when the air conditioner is in the refrigeration mode or the dehumidification mode, the exhaust temperature of the compressor is detected; then the detected exhaust temperature is compared with the first preset temperature, if the exhaust temperature is greater than or equal to the first preset temperature, it is judged whether the exhaust temperature greater than or equal to the first preset temperature is continuous for the first preset time length, after the exhaust temperature greater than or equal to the first preset temperature is continuous for the first preset time length, the supercooling expansion valve is opened and opened to the preset initial opening degree.

[0055] It should be noted that since the exhaust temperature of the compressor is greater than or equal to the first preset temperature, the supercooling expansion valve is opened to the preset initial opening degree only when it is continuous for the first preset time length, so that the phenomenon of the supercooling expansion valve being opened due to the error of the temperature sensor in detecting the exhaust temperature can be reduced.

[0056] As shown in Figure 4 , Figure 4 is Figure 2 The control method of the air conditioner provided by the embodiment provides a specific flow chart of the step of detecting the auxiliary road superheat of the auxiliary road channel. The step of detecting the auxiliary road superheat of the auxiliary road channel can include but is not limited to step S410 and step S420.

[0057] Step S410, acquire the outlet refrigerant temperature and the inlet refrigerant temperature of the auxiliary road channel;

[0058] Step S420, determine the auxiliary road superheat of the auxiliary road channel according to the outlet refrigerant temperature and the inlet refrigerant temperature.

[0059] Specifically, the outlet refrigerant temperature and the inlet refrigerant temperature are detected at the related positions of the auxiliary road channel, and then the auxiliary road superheat of the auxiliary road channel is determined according to the acquired outlet refrigerant temperature and inlet refrigerant temperature.

[0060] It should be noted that the auxiliary road superheat of the auxiliary road channel is the difference between the outlet refrigerant temperature of the auxiliary road channel and the inlet refrigerant temperature of the auxiliary road channel.

[0061] Specifically, the step of adjusting the opening degree of the supercooling expansion valve according to the auxiliary road superheat can be divided into the following cases:

[0062] The first case, when the auxiliary road superheat is less than the first preset superheat, the opening degree of the supercooling expansion valve is reduced by the first preset step length every preset period length;

[0063] In the second case, when the auxiliary path superheat is greater than or equal to the first preset superheat and less than or equal to the second preset superheat, the opening degree of the subcooling expansion valve is kept unchanged.

[0064] In the third case, when the auxiliary path superheat is greater than the second preset superheat, the running current of the air conditioner is obtained, and the opening degree of the subcooling expansion valve is adjusted according to the running current.

[0065] In an embodiment, after the auxiliary path superheat is obtained according to the outlet refrigerant temperature and the inlet refrigerant temperature of the auxiliary path, the opening degree of the subcooling expansion valve is adjusted by judging the size relationship among the auxiliary path superheat, the first preset superheat and the second preset superheat. If the auxiliary path superheat is less than the first preset superheat, the opening degree of the subcooling expansion valve is adjusted according to the first preset step every preset period, so that the opening degree of the subcooling expansion valve is reduced. When the auxiliary path superheat is greater than or equal to the first preset superheat and less than or equal to the second preset superheat, the opening degree of the subcooling expansion valve is not adjusted, and the opening degree of the subcooling expansion valve is kept unchanged. When the auxiliary path superheat is greater than the second preset superheat, the running current of the air conditioner is obtained, and the opening degree of the subcooling expansion valve is adjusted according to the running current. Since the opening degree of the subcooling expansion valve is controlled by the auxiliary path superheat, the appropriate superheat of the enthalpy increasing port is ensured, thereby effectively preventing the liquid return in the air supplement process, and the reliability of the compressor is improved. Therefore, the compressor discharge temperature can be effectively reduced under the premise of strong refrigeration of the unit in a high temperature environment, so that the unit can operate reliably and stably.

[0066] It should be noted that the first preset superheat is less than the second preset superheat.

[0067] It can be understood that when the auxiliary path superheat is less than the first preset superheat, the opening degree of the subcooling expansion valve is reduced by the first preset step every preset period, so that the outlet temperature of the auxiliary path is increased, and the auxiliary path superheat is increased, and the discharge temperature is reduced. Since the opening degree of the subcooling expansion valve is reduced, the flow of the refrigerant through the subcooling expansion valve is reduced, and the heat absorbed by each unit of the refrigerant from the main path is increased. Therefore, the outlet temperature of the auxiliary path is increased, the auxiliary path superheat is increased, and the discharge temperature is reduced, so that the appropriate superheat of the enthalpy increasing port is ensured, thereby effectively preventing the liquid return in the air supplement process, improving the reliability of the compressor, and further ensuring that the compressor discharge temperature can be effectively reduced under the premise of strong refrigeration of the unit in a high temperature environment, so that the unit can operate reliably and stably. If the opening degree of the subcooling expansion valve is kept or increased when the auxiliary path superheat is less than the first preset superheat, the heat absorbed by each unit of the refrigerant from the main path through the auxiliary path is reduced, the outlet temperature of the auxiliary path is reduced, the auxiliary path superheat is reduced, and the superheat of the enthalpy increasing port is reduced, which may result in reduced reliability of the compressor, and further affect the performance of the compressor.

[0068] It can be understood that when the auxiliary path superheat is greater than or equal to the first preset superheat and less than or equal to the second preset superheat, that is, the auxiliary path superheat is in a suitable range, the opening degree of the subcooling expansion valve is not adjusted, and the current opening degree is maintained. Since the opening degree of the subcooling expansion valve is maintained, the auxiliary path superheat is still in a suitable range. Therefore, a certain suitable superheat is ensured at the enthalpy increasing port, thereby effectively preventing liquid return during the air supplementing process, thereby improving the reliability of the compressor, and further effectively reducing the exhaust temperature of the compressor under the premise that the unit reliably and stably operates under strong refrigeration in a high temperature environment, so that the unit reliably and stably operates.

[0069] It can be understood that when the auxiliary path superheat is greater than the second preset superheat, the opening degree of the subcooling expansion valve is adjusted according to the obtained operating current of the air conditioner. Since the operating current of the air conditioner is related to the performance of the air conditioner, adjusting the opening degree of the subcooling expansion valve according to the size of the operating current can ensure the normal operation of the air conditioner and reduce damage to the air conditioner.

[0070] Specifically, the step of adjusting the opening degree of the subcooling expansion valve according to the operating current can further include the following cases:

[0071] The first case is that when the operating current is less than the first preset current, the opening degree of the subcooling expansion valve is increased by the second preset step length every preset period of time.

[0072] The second case is that when the operating current is greater than or equal to the first preset current and less than or equal to the second preset current, the opening degree of the subcooling expansion valve is increased by the third preset step length every preset period of time, and the third preset step length is less than the second preset step length.

[0073] The third case is that when the operating current is greater than the second preset current, the opening degree of the subcooling expansion valve is maintained unchanged.

[0074] In an embodiment, when the auxiliary path superheat is greater than the second preset superheat, the operating current of the air conditioner is obtained, and the operating current of the air conditioner is compared with the first preset current and the second preset current. If the operating current is less than the first preset current, the opening of the subcooling expansion valve is adjusted by the second preset step every preset period, so that the opening of the subcooling expansion valve is increased. When the operating current is greater than or equal to the first preset current and less than or equal to the second preset current, the opening of the subcooling expansion valve is increased by the third preset step every preset period. When the operating current is greater than the second preset current, the opening of the subcooling expansion valve is kept unchanged. Since the opening of the subcooling expansion valve is controlled by increasing the operating current when the auxiliary path superheat is greater than the second preset superheat, damage to the air conditioner caused by the operating current is prevented. In addition, by controlling the opening of the subcooling expansion valve, the refrigerant at the enthalpy-increasing port has a certain appropriate superheat, thereby effectively preventing liquid return during the air supplement process, thereby improving the reliability of the compressor. Therefore, the compressor can be effectively cooled under the premise of strong refrigeration in a high-temperature environment, so that the compressor can operate reliably and stably.

[0075] It should be noted that when the operating current is less than the first preset current, the opening of the subcooling expansion valve is increased by the second preset step every preset period. Since the opening of the subcooling expansion valve is increased, the flow of the refrigerant through the subcooling expansion valve is increased, and the heat absorbed by each unit of the refrigerant in the main path channel is reduced, thereby reducing the outlet temperature of the auxiliary path channel, thereby reducing the auxiliary path superheat. Therefore, the enthalpy-increasing port can have a certain appropriate superheat, thereby improving the reliability of the compressor.

[0076] It should be noted that when the operating current is greater than or equal to the first preset current and less than or equal to the second preset current, the opening of the subcooling expansion valve is increased by the third preset step every preset period. Since the opening of the subcooling expansion valve is increased, the flow of the refrigerant through the subcooling expansion valve is increased, and the heat absorbed by each unit of the refrigerant in the main path channel is reduced, thereby reducing the outlet temperature of the auxiliary path channel, thereby reducing the auxiliary path superheat. Therefore, the enthalpy-increasing port can have a certain appropriate superheat, thereby improving the reliability of the compressor.

[0077] It should be noted that when the operating current is greater than the second preset current, the opening of the subcooling expansion valve is kept unchanged. Since the operating current is greater than the second preset current, if the opening of the subcooling expansion valve is increased at this time, the operating current may increase, which can cause damage to the air conditioner. If the opening of the subcooling expansion valve is reduced, the auxiliary path superheat will increase, thereby reducing the reliability of the compressor. Therefore, when the operating current is greater than the second preset current, the opening of the subcooling expansion valve is not adjusted.

[0078] Specifically, the first preset current and the second preset current can be obtained by detecting the unit limiting frequency current, the first proportional parameter and the second proportional parameter; the first preset current is the product of the unit limiting frequency current and the first proportional parameter, and the second preset current is the product of the unit limiting frequency current and the second proportional parameter. The second proportional parameter is greater than the first proportional parameter, and therefore the second preset current is greater than the first preset current.

[0079] It should be noted that the first proportional parameter and the second proportional parameter can be set according to actual conditions, and are fixed values, and the embodiment does not make specific limitations thereto.

[0080] Specifically, after obtaining the exhaust temperature of the compressor, the control method further includes but is not limited to the following cases:

[0081] The first case is that when the exhaust temperature is less than the second preset temperature and lasts for the second preset time length, the supercooling expansion valve is closed.

[0082] In an embodiment, after the air conditioner is started, it is firstly judged in which mode the air conditioner is; when the air conditioner is in a refrigeration mode or a dehumidification mode, the exhaust temperature of the compressor is detected; then the size relationship between the detected exhaust temperature and the second preset temperature is compared, when the exhaust temperature is less than the second preset temperature, it is judged whether the exhaust temperature less than the second preset temperature lasts for the second preset time length, and when the exhaust temperature less than the second preset temperature lasts for the second preset time length, the supercooling expansion valve is closed.

[0083] It should be noted that when the exhaust temperature of the compressor is less than the second preset temperature and lasts for the second preset time length, if the supercooling expansion valve is kept in an open state, the refrigerant will flow to the auxiliary passage through the supercooling expansion valve and absorb the heat of the main passage, the exhaust temperature of the compressor is reduced, thereby possibly leading to too low exhaust temperature, freezing of the condensate water of the air conditioner in the exhaust pipeline, blocking of the exhaust pipeline, and further affecting the normal operation of the air conditioner; in addition, too low exhaust temperature can cause the compressor to be unable to provide sufficient refrigerant flow, reducing the refrigeration effect.

[0084] Specifically, the control method further includes but is not limited to the following cases:

[0085] The first case is that the enthalpy injection on-off valve is opened.

[0086] In an embodiment, the enthalpy injection on-off valve is used to control the flow of the refrigerant, when the air conditioning system is in a refrigeration or dehumidification mode, the enthalpy injection on-off valve is opened, allowing the refrigerant to flow from the auxiliary passage of the supercooling heat exchanger to the enthalpy increasing port of the compressor 100, absorbing the heat of the main passage, reducing the exhaust temperature of the compressor, so that the unit can operate reliably and stably.

[0087] AsFigure 5 As shown, Figure 5 is the overall flow chart of the control method of the air conditioner provided in an embodiment of the present application. The specific steps are as follows:

[0088] 1) The air conditioner is started and is in a cooling or dehumidifying mode;

[0089] 2) The size relationship of the exhaust temperature TP, the first preset temperature T1 and the second preset temperature T2 is determined;

[0090] 2.1) When the exhaust temperature TP is greater than or equal to the first preset temperature T1 and lasts for the first preset time length T1s, the opening degree of the supercooling expansion valve is opened to a preset initial opening degree;

[0091] 2.1.1) The size relationship of the auxiliary path superheat TFsh, the first preset superheat TFsh1 and the second preset superheat TFsh2 is determined; 2.1.1.1) When the auxiliary path superheat TFsh is less than the first preset superheat TFsh1, the opening degree of the supercooling expansion valve is reduced by a first preset step length every preset period time length;

[0092] 2.1.1.2) When the auxiliary path superheat TFsh is greater than or equal to the first preset superheat TFsh1 and less than or equal to the second preset superheat TFsh2, the opening degree of the supercooling expansion valve is kept unchanged;

[0093] 2.1.1.3) When the auxiliary path superheat TFsh is greater than the second preset superheat TFsh2, the running current of the air conditioner is obtained, and the size relationship of the running current of the air conditioner, the first preset current and the second preset current is determined;

[0094] 2.1.1.3.1) When the running current is less than the first preset current, the opening degree of the supercooling expansion valve is increased by a second preset step length every preset period time length;

[0095] 2.1.1.3.2) When the running current is greater than or equal to the first preset current and less than or equal to the second preset current, the opening degree of the supercooling expansion valve is increased by a third preset step length every preset period time length;

[0096] 2.1.1.3.3) When the running current is greater than the second preset current, the opening degree of the supercooling expansion valve is kept unchanged;

[0097] 2.2) When the exhaust temperature TP is less than the second preset temperature and lasts for the second preset time length, the supercooling expansion valve is closed.

[0098] Specifically, after the air conditioner is started, firstly, it is judged in which mode the air conditioner is; if the air conditioner is in a cooling mode or a dehumidifying mode, the injection enthalpy opening valve is opened, and the discharge temperature TP of the compressor is detected; then, the discharge temperature TP of the air conditioner is compared with the first preset temperature T1 and the second preset temperature T2, when TP is greater than or equal to T1, and the duration reaches the first preset time T1s, the supercooling expansion valve is opened, and the opening degree of the supercooling expansion valve is opened to the preset initial opening degree; when TP is less than T2, and the duration reaches the second preset time T2s, the supercooling expansion valve is closed.

[0099] When TP is greater than or equal to T1 and T1s, the supercooling expansion valve is opened, and after the opening degree of the supercooling expansion valve is opened to the preset initial opening degree, the auxiliary superheat TFsh is compared with the first preset superheat TFsh1 and the second preset superheat TFsh2, when TFsh is less than TFsh1, the opening degree of the supercooling expansion valve is reduced by the first preset step every interval of a preset period; when TFsh is greater than or equal to TFsh1 and less than or equal to TFsh2, the opening degree of the supercooling expansion valve is kept unchanged; when TFsh is greater than TFsh2, firstly, the running current of the air conditioner is detected, then, the running current of the air conditioner is compared with the first preset current and the second preset current, and then, when the running current is less than the first preset current, the opening degree of the supercooling expansion valve is increased by the second preset step every interval of a preset period; when the running current is greater than or equal to the first preset current and less than or equal to the second preset current, the opening degree of the supercooling expansion valve is increased by the third preset step every interval of a preset period; when the running current is greater than the second preset current, the opening degree of the supercooling expansion valve is kept unchanged. Since the embodiment of the application can reduce the discharge temperature of the compressor based on the intermediate jet cooling control method of the jet enthalpy increasing compressor, effectively reduce the discharge temperature and also have a good effect on improving the system performance, and relative to the suction side liquid injection cooling technology, the intermediate jet cooling control method can reduce the risk of liquid hammer. In addition, the embodiment of the application also increases the auxiliary superheat judgment to control the opening degree of the supercooling expansion valve, so as to ensure that the refrigerant in the enthalpy increasing port has a certain suitable superheat, thereby effectively preventing liquid return in the air injection process, thereby improving the reliability of the compressor. Therefore, the embodiment of the application can effectively reduce the discharge temperature of the compressor under the premise of strong refrigeration of the unit in a high temperature environment, so that the unit can reliably and stably operate.

[0100] It should be noted that the first preset current is the product value of the unit frequency limiting current and the first proportion parameter; the second preset current is the product value of the unit frequency limiting current and the second proportion parameter, wherein Climt is the unit frequency limiting current, L1% is the first proportion parameter, L2% is the second proportion parameter, and the second proportion parameter is greater than the first proportion parameter, and the second preset current is greater than the first preset current.

[0101] It should be noted that the first preset temperature, second preset temperature, first preset duration, second preset duration, preset initial opening degree, first preset superheat, second preset superheat, first preset current, second preset current, preset period, first preset step size, second preset step size, and third preset step size mentioned above can be set according to actual needs. Moreover, the first preset temperature, second preset temperature, first preset duration, second preset duration, preset initial opening degree, first preset superheat, second preset superheat, first preset current, second preset current, preset period, first preset step size, second preset step size, and third preset step size are fixed values, and this embodiment does not specifically limit them.

[0102] It is understandable that the discharge temperature of the compressor can be obtained by installing a temperature sensor at a relevant location on the compressor; similarly, the outlet refrigerant temperature of the auxiliary circuit can be obtained by installing a temperature sensor at a relevant location on the auxiliary circuit; and the inlet refrigerant temperature of the auxiliary circuit can also be obtained by installing a temperature sensor at a relevant location on the auxiliary circuit.

[0103] In addition, it is understood that the type of temperature sensor can be a thermocouple temperature sensor, a thermistor temperature sensor, a resistance temperature sensor, an IC temperature sensor, or other types of temperature sensors. This application does not limit the specific type of temperature sensor.

[0104] It is understandable that the aforementioned frequency-limiting current of the unit can be obtained by installing current sensors at relevant locations on the air conditioner.

[0105] In addition, it is understood that the type of current sensor can be a Hall effect sensor, a resistive sensor, a mutual inductance sensor, an electromagnetic sensor, or other types of current sensors. The embodiments of this application do not limit the specific type of temperature sensor.

[0106] like Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a controller for performing a control method for an air conditioner according to an embodiment of this application. The controller 600 implemented in this application includes: a processor 610, a memory 620, and a computer program stored in the memory 620 and executable on the processor 610, wherein... Figure 6 The example uses a processor 610 and a memory 620.

[0107] The processor 610 and the memory 620 can be connected by a bus or other means, Figure 6 The bus connection is taken as an example.

[0108] The memory 620, as a non-transitory computer readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 620 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory 620 can optionally include a memory 620 remotely arranged relative to the processor 610, and these remote memories 620 can be connected to the controller 600 through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0109] Those skilled in the art can understand that, Figure 6 The device structure shown in the above embodiments does not constitute a limitation on the controller 600, and can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0110] In Figure 6 In the controller 600 shown, the processor 610 can be used to call the control program of the air conditioner stored in the memory 620, so as to realize the control method of the air conditioner described above. Specifically, the non-transitory software programs and instructions required for the control method of the air conditioner of the above embodiments are stored in the memory 620, and when executed by the processor 610, the control method of the air conditioner of the above embodiments is executed.

[0111] It is worth noting that since the controller 600 of the embodiments of the present application can execute the control method of the air conditioner of any of the above embodiments, the specific implementation and technical effects of the controller 600 of the embodiments of the present application can be referred to the specific implementation and technical effects of the control method of the air conditioner of any of the above embodiments.

[0112] In addition, one embodiment of the present application also provides an air conditioner comprising the controller of the above embodiments.

[0113] It is worth noting that since the controller of the embodiments of the present application comprises the controller of the above embodiments, and the controller of the above embodiments can execute the control method of the air conditioner of any of the above embodiments, the specific implementation and technical effects of the air conditioner of the embodiments of the present application can be referred to the specific implementation and technical effects of the control method of the air conditioner of any of the above embodiments.

[0114] Further, an embodiment of the present application also provides a computer readable storage medium storing computer executable instructions for performing the control method of the air conditioner as described above. Exemplarily, the method steps in the above description are performed. Figures 2 to 5

[0115] It is worth noting that since the computer readable storage medium of the embodiment of the present application can perform the control method of the air conditioner of any of the above embodiments, the specific implementation and technical effects of the computer readable storage medium of the embodiment of the present application can refer to the specific implementation and technical effects of the control method of the air conditioner of any of the above embodiments.

[0116] Those skilled in the art can understand that all or some of the steps in the method disclosed above can be implemented as software, firmware, hardware and their appropriate combinations. Some or all of the physical components can be implemented as software executed by a processor such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, as known to those skilled in the art, communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transport mechanisms, and can include any information delivery medium.

[0117] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.​

Claims

1. A control method of an air conditioner, characterized by, The air conditioner comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger and a supercooling device, the supercooling device comprises a supercooling heat exchanger and a supercooling expansion valve, the supercooling heat exchanger comprises a main path channel and an auxiliary path channel, an inlet of the main path channel is communicated to the outdoor heat exchanger, an outlet of the main path channel is communicated to a return gas port of the compressor, an inlet of the auxiliary path channel is communicated to a refrigerant pipeline between an outlet of the main path channel and the indoor heat exchanger through the supercooling expansion valve, and an outlet of the auxiliary path channel is communicated to an enthalpy-increasing port of the compressor; the control method comprises: In a refrigeration mode or a dehumidification mode, an exhaust temperature of the compressor is acquired; When the exhaust temperature is greater than or equal to a first preset temperature, the supercooling expansion valve is opened; An auxiliary path superheat degree of the auxiliary path channel is detected, and an opening degree of the supercooling expansion valve is adjusted according to the auxiliary path superheat degree; The adjustment of the opening degree of the supercooling expansion valve according to the auxiliary path superheat degree comprises: When the auxiliary path superheat degree is greater than a second preset superheat degree, an operating current of the air conditioner is acquired, and the opening degree of the supercooling expansion valve is adjusted according to the operating current.

2. The control method according to claim 1, characterized by, The opening of the supercooling expansion valve when the exhaust temperature is greater than or equal to the first preset temperature comprises: When the exhaust temperature is greater than or equal to the first preset temperature and lasts for a first preset time length, the opening degree of the supercooling expansion valve is opened to a preset initial opening degree.

3. The control method according to claim 1, characterized by, The detection of the auxiliary path superheat degree of the auxiliary path channel comprises: An outlet refrigerant temperature and an inlet refrigerant temperature of the auxiliary path channel are acquired; The auxiliary path superheat degree of the auxiliary path channel is determined according to the outlet refrigerant temperature and the inlet refrigerant temperature.

4. The control method according to claim 1 or 3, characterized by, The adjustment of the opening degree of the supercooling expansion valve according to the auxiliary path superheat degree comprises: When the auxiliary path superheat degree is less than a first preset superheat degree, the opening degree of the supercooling expansion valve is reduced by a first preset step length every preset period time length; When the auxiliary path superheat degree is greater than or equal to the first preset superheat degree and less than or equal to a second preset superheat degree, the opening degree of the supercooling expansion valve is kept unchanged.

5. The control method according to claim 1, characterized by, The adjustment of the opening degree of the supercooling expansion valve according to the operating current comprises: When the operating current is less than a first preset current, the opening degree of the supercooling expansion valve is increased by a second preset step length every preset period time length; When the operating current is greater than or equal to the first preset current and less than or equal to a second preset current, the opening degree of the supercooling expansion valve is increased by a third preset step length every preset period time length, and the third preset step length is less than the second preset step length; When the operating current is greater than the second preset current, the opening degree of the supercooling expansion valve is kept unchanged.

6. The control method according to claim 5, characterized by The first preset current is obtained by the following steps: acquiring a unit limit frequency current and a first proportion parameter, and taking a product value of the unit limit frequency current and the first proportion parameter as the first preset current; The second preset current is obtained by the following steps: acquiring a unit limit frequency current and a second proportion parameter, and taking a product value of the unit limit frequency current and the second proportion parameter as the second preset current, and the second proportion parameter is greater than the first proportion parameter.

7. The control method according to claim 1, characterized by, After the obtaining the discharge temperature of the compressor, the control method further comprises: When the discharge temperature is less than a second preset temperature and lasts for a second preset time length, closing the supercooling expansion valve.

8. The control method according to claim 1, characterized by The air conditioner further comprises a spray enthalpy on-off valve, which is arranged between the outlet of the auxiliary passage and the enthalpy increasing port of the compressor. In the refrigeration mode or the dehumidification mode, the control method further comprises: opening the spray enthalpy on-off valve.

9. A controller characterized by, The air conditioner comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the control method according to any one of claims 1 to 8.

10. An air conditioner characterized by comprising: The controller according to claim 9.

11. A computer-readable storage medium, characterized in that: computer executable instructions for performing the control method according to any one of claims 1 to 8.

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