Enhanced vapor injection air conditioning system and control method therefor, control apparatus, and storage medium

Abstract

An enhanced vapor injection air conditioning system and a control method therefor, a control apparatus, and a storage medium. The system comprises: an enhanced vapor pipeline, a first end of the enhanced vapor pipeline being connected to an indoor heat exchanger, a second end of the enhanced vapor pipeline being connected to an outdoor heat exchanger, and a third end of the enhanced vapor pipeline being connected to an air return port of a compressor; a liquid discharge pipeline, one end of the liquid discharge pipeline being connected to the third end of the enhanced vapor pipeline, another end of the liquid discharge pipeline being connected to the air return port of the compressor, and the liquid discharge pipeline being provided with a liquid discharge electromagnetic valve; and a controller, used to determine that a preset liquid discharge condition is met and control the liquid discharge electromagnetic valve to be opened during an operation process of the system.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese patent application No. 2023106421342, titled "VAPOR INJECTION ENTHALPY-INCREASING AIR CONDITIONING SYSTEM, CONTROL METHOD AND CONTROL APPARATUS THEREFOR, and STORAGE MEDIUM" filed on May 31, 2023, which is incorporated herein by reference in its entirety.FIELD

[0002] The present disclosure relates to the field of air conditioner technologies, and more particularly, to a vapor injection enthalpy-increasing air conditioning system, a control method for a vapor injection enthalpy-increasing air conditioning system, a control apparatus for a vapor injection enthalpy-increasing air conditioning system, and a computer-readable storage medium.BACKGROUND

[0003] With the completion of implementation details of the Paris Agreement at the United Nations Climate Change Conference, the development of low GWP (Global Warming Potential) refrigerants in the heating, ventilation and air-conditioning industry has further accelerated. Since most low GWP refrigerants such as the R32 refrigerant and the R290 refrigerant are flammable, the refrigerant charge amount of a device is required not to exceed a limit for safety considerations. In cold areas, a vapor injection enthalpy-increasing technology is employed to ensure energy efficiency of heating at low-temperature, which, however, may cause liquid accumulation in some parts of a system, resulting in a poor cooling effect.SUMMARY

[0004] The present disclosure aims to solve at least one of the technical problems in the related art. To this end, in some embodiments of the present disclosure, a vapor injection enthalpy-increasing air conditioning system is provided, in which a liquid discharge pipeline is additionally provided. During operation of the system, when a predetermined liquid discharge condition is satisfied, a liquid discharge solenoid valve at the liquid discharge pipeline is controlled to be in an open state, to cause a refrigerant in an enthalpy-increase pipeline to flow back to a compressor. After a period of time, the liquid discharge solenoid valve is controlled to be closed, to ensure normal operation of the air conditioning system. In this way, system performance degradation caused by liquid accumulation can be avoided, and system energy efficiency can be improved.

[0005] In some embodiments of the present disclosure, a control method for a vapor injection enthalpy-increasing air conditioning system is provided.

[0006] In some embodiments of the present disclosure, a control apparatus for a vapor injection enthalpy-increasing air conditioning system is provided.

[0007] In some embodiments of the present disclosure, a computer-readable storage medium is provided.

[0008] In some embodiments of the present disclosure, a vapor injection enthalpy-increasing air conditioning system is provided.

[0009] To achieve the above-described objectives, in some embodiments of the present disclosure, a vapor injection enthalpy-increasing air conditioning system is provided. The system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, and a third end connected to a return gas port of a compressor; a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor, the liquid discharge pipeline being provided with a liquid discharge solenoid valve; and a controller configured to determine that a predetermined liquid discharge condition is satisfied during operation of the system, control the liquid discharge solenoid valve to be opened, and control the liquid discharge solenoid valve to be closed subsequent to delaying for a first predetermined period.

[0010] With the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, the liquid discharge pipeline is provided. The liquid discharge pipeline has the end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor, and the liquid discharge pipeline is provided with the liquid discharge solenoid valve. During the operation of the system, when determining that the predetermined liquid discharge condition is satisfied, the controller controls the liquid discharge solenoid valve to be opened. The system is provided with the liquid discharge pipeline at the enthalpy-increasing pipeline, and the liquid discharge pipeline is connected to the return gas port of the compressor. When the system satisfies the liquid discharge condition, the liquid discharge solenoid valve is controlled to be opened, to discharge liquid from the enthalpy-increasing line. In this way, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0011] In addition, the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure may further have the following additional technical features.

[0012] According to some embodiments of the present disclosure, the controller is further configured to: when controlling the liquid discharge solenoid valve to be opened, adjust an opening degree of a first throttling element in the enthalpy-increasing pipeline to a predetermined opening degree.

[0013] According to some embodiments of the present disclosure, the above-described vapor injection enthalpy-increasing air conditioning system further comprises a heat exchanger disposed at the enthalpy-increasing pipeline. The heat exchanger has a first end connected to the indoor heat exchanger, a second end connected to the outdoor heat exchanger, a third end connected to the second end of the heat exchanger through the first throttling element, and a fourth end connected to the discharge port of the compressor. The controller is further configured to, subsequent to adjusting the opening degree of the first throttling element in the enthalpy-increasing pipeline to the predetermined opening degree: obtain an outlet temperature and an inlet temperature of the heat exchanger, and adjust the opening degree of the first throttling element, to cause a temperature difference between the outlet temperature and the inlet temperature of the heat exchanger to be greater than a first predetermined temperature threshold.

[0014] According to some embodiments of the present disclosure, the controller is further configured to: subsequent to delaying for a first predetermined period, control the first throttling element to be closed, and subsequent to delaying for a second predetermined period, control the liquid discharge solenoid valve to be closed.

[0015] According to some embodiments of the present disclosure, the controller, when configured to determine that the predetermined liquid discharge condition is satisfied, is configured to: an operating mode of the air conditioning system to be a cooling mode; or the operating mode of the air conditioning system to be switched from a heating mode to the cooling mode; or the operating mode of the air conditioning system to be switched from an enthalpy-increasing heating mode to a non-enthalpy-increasing heating mode; or a return gas temperature of the compressor to be greater than a predetermined temperature value when the air conditioning system is operating in the cooling mode.

[0016] According to some embodiments of the present disclosure, the above-described vapor injection enthalpy-increasing air conditioning system further comprises a second throttling element disposed at the liquid discharge pipeline. The second throttling element has an end connected to the liquid discharge solenoid valve, and another end connected to the return gas port of the compressor.

[0017] To achieve the above-described objectives, in some embodiments of the present disclosure, a control method for a vapor injection enthalpy-increasing air conditioning system is provided. The system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, a third end connected to a return gas port of a compressor; and a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor, the liquid discharge pipeline being provided with a liquid discharge solenoid valve. The method comprises: determining that a predetermined liquid discharge condition is satisfied during operation of the system; and controlling the liquid discharge solenoid valve to be opened.

[0018] With the control method for the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, it is determined that the predetermined liquid discharge condition is satisfied, and the liquid discharge solenoid valve is controlled to be opened. Therefore, when the system satisfies the liquid discharge condition, the method can control the liquid discharge solenoid valve to be opened, to discharge the liquid from the enthalpy-increasing line. In this way, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0019] To achieve the above-described objectives, in some embodiments of the present disclosure, a control apparatus for a vapor injection enthalpy-increasing air conditioning system is provided. The system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, a third end connected to a return gas port of a compressor; and a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor, the liquid discharge pipeline being provided with a liquid discharge solenoid valve. The apparatus comprises: a determining module configured to determine that a predetermined liquid discharge condition is satisfied during operation of the system; and a control module configured to control the liquid discharge solenoid valve to be opened.

[0020] With the control apparatus for the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, the determining module determines that the predetermined liquid discharge condition is satisfied during the operation of the system, and the control module controls the liquid discharge solenoid valve to be opened. Therefore, when the system satisfies the liquid discharge condition, the apparatus can control the liquid discharge solenoid valve to be opened, to discharge liquid from the enthalpy-increasing line. In this way, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0021] To achieve the above-described objectives, in some embodiments of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium has a control program for a vapor injection enthalpy-increasing air conditioning system stored thereon. The control program for the vapor injection enthalpy-increasing air conditioning system, when executed by a processor, implements the above-described control method for the vapor injection enthalpy-increasing air conditioning system.

[0022] With the computer-readable storage medium according to some embodiments of the present disclosure, by executing the above-described vapor injection enthalpy-increasing air conditioning system, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0023] To achieve the above-described objectives, in some embodiments of the present disclosure, a vapor injection enthalpy-increasing air conditioning system is provided. The system comprises a memory, a processor, and a control program for the vapor injection enthalpy-increasing air conditioning system stored in the memory and executable by the processor. When the control program for the vapor injection enthalpy-increasing air conditioning system is executed by the processor, the above-described control method for the vapor injection enthalpy-increasing air conditioning system is implemented. With the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, by executing the above-described control method for the vapor injection enthalpy-increasing air conditioning system, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0024] Additional aspects and advantages of the present disclosure will be provided in the following description, or will become apparent at least in part from the following description, or may be learned from practicing of the present disclosure.BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a schematic structural diagram of a vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure. FIG. 2 is a flowchart of a control method for a vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure. FIG. 3 is a block diagram of a control apparatus for a vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure. FIG. 4 is a block diagram of a vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Embodiments of the present disclosure will be described in detail below with reference to examples thereof as illustrated in the accompanying drawings, throughout which same or similar elements, or elements having same or similar functions, are denoted by same or similar reference numerals. The embodiments described below with reference to the drawings are illustrative only, and are intended to explain, rather than limiting, the present disclosure.

[0027] A vapor injection enthalpy-increasing air conditioning system, a control method for a vapor injection enthalpy-increasing air conditioning system, a control apparatus for a vapor injection enthalpy-increasing air conditioning system, and a computer-readable storage medium according to embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0028] FIG. 1 is a schematic structural diagram of a vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure.

[0029] As illustrated in FIG. 1, the enthalpy-increasing air conditioning system may comprise: an enthalpy-increasing pipeline (not numbered in the figure), a liquid discharge pipeline (not numbered in the figure), and a controller (not specifically illustrated in the figure)

[0030] The enthalpy-increasing pipeline has a first end connected to an indoor heat exchanger 10, a second end connected to an outdoor heat exchanger 20, and a third end connected to a return gas port of a compressor 50. The liquid discharge pipeline has an end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor 50. The liquid discharge pipeline is provided with a liquid discharge solenoid valve 31. The controller is configured to determine that a predetermined liquid discharge condition is satisfied during operation of the system, and control the liquid discharge solenoid valve 31 to be opened.

[0031] When an air conditioner is in a heating mode, due to some special working conditions (such as an outdoor ambient temperature being lower than a set value), an enthalpy-increasing mode needs to be activated to ensure the heating effect. When the enthalpy increasing mode is activated, a part of refrigerant exiting the indoor heat exchanger 10 will pass through the enthalpy-increasing pipeline and flow back to the return gas port of the compressor, to enhance heating performance of the compressor. When the air conditioning system does not need to activate the enthalpy increasing mode (for example, when the enthalpy increasing mode is deactivated, or the air conditioner is in a cooling mode), the refrigerant exists in the enthalpy-increasing pipeline in both gas phase and liquid phase, causing liquid accumulation. If the liquid is not discharged in time, system energy efficiency will be reduced. Therefore, the enthalpy-increasing pipeline is additionally provided with a liquid discharge bypass (the liquid discharge pipeline), and the liquid discharge solenoid valve 31 is disposed at the liquid discharge pipeline. By controlling the liquid discharge solenoid valve 31 to be opened, the refrigerant in the gas phase and the refrigerant in the liquid phase in the enthalpy-increasing pipeline can be discharged to avoid reduction of the system energy efficiency caused by the liquid accumulation. Subsequent to the liquid discharge solenoid valve 31 being opened for a period of time, the liquid discharge solenoid valve 31 is controlled to be closed, completing the liquid discharge control logic.

[0032] In some embodiments of the present disclosure, the controller being configured to determine that the predetermined liquid discharge condition is satisfied comprises the controller being configured to: determine an operating mode of the air conditioning system to be a cooling mode; or determine the operating mode of the air conditioning system to be switched from a heating mode to the cooling mode; or determine the operating mode of the air conditioning system to be switched from an enthalpy-increasing heating mode to a non-enthalpy-increasing heating mode; or determine a return gas temperature of the compressor to be greater than a predetermined temperature value when the air conditioning system is operating in the cooling mode. In other words, as long as a first throttling element 42 is opened, liquid discharge control needs to be performed.

[0033] In some embodiments of the present disclosure, the vapor injection enthalpy-increasing air conditioning system further comprises the compressor 50, the outdoor heat exchanger 20, the indoor heat exchanger 10, the first throttling element 42, a heat exchanger 41, a second throttling element 32, and a four-way valve 60. The first throttling element 42 and the heat exchanger 41 are disposed at the enthalpy-increasing pipeline. The heat exchanger 41 has a first end connected to an end of the indoor heat exchanger 10, a second end connected to an end of the first throttling element 42, a third end connected to another end of the first throttling element 42, and a fourth end connected to the return gas port of the compressor 50 through a one-way valve. The second throttling element 32 is disposed at the liquid discharge pipeline. The second throttling element 32 has an end connected to the liquid discharge solenoid valve 31, and another end connected to the return gas port of the compressor 50. The second throttling element 32 may be a capillary tube, which serves to throttle and reduce pressure.

[0034] When the enthalpy-increasing air conditioning system operates in the enthalpy increasing mode, the first throttling element 42 is controlled to be in an open state. A high-temperature and high-pressure refrigerant exiting the compressor 50 enters the indoor heat exchanger 10 through the four-way valve 60 having an end A and an end B being in communication with each other at this time. The refrigerant exiting the indoor heat exchanger 10 passes through the heat exchanger 41 having the first end and the second end being in communication with each other, and takes two paths. The refrigerant in one path flows through the first throttling element 42 for primary throttling and pressure reduction, and enters the outdoor heat exchanger 20, and the refrigerant in another path flows through a throttling element and enters the heat exchanger 41 (having the third end and the fourth end being in communication with each other) for heat exchange and subsequently enters the return gas port of the compressor 50 through a one-way valve, to achieve enthalpy increase. When the enthalpy increase is completed, regardless of whether the first throttling element 42 is in the open state or in a closed state, the refrigerant exists in both the gas phase and the liquid phase inside the heat exchanger 41 and in a circuit from the heat exchanger 41 to the compressor, resulting in a decrease in a total amount of system refrigerant and a decrease in performance.

[0035] In addition, when the air conditioning system operates in the cooling mode, the high-temperature and high-pressure refrigerant exiting the compressor 50, after passing through the four-way valve 60 (having the end A and an end D being in communication with each other) and entering the outdoor heat exchanger 20 for heat exchange, passes through a primary throttling element for throttling and depressurization and becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant enters the indoor heat exchanger 10 for heat exchange, and returns to the return gas port of the compressor 50 through the four-way valve 60 (having the end B and an end C being in communication with each other). If a temperature at the return gas port of the compressor 50 is too high, the first throttling element 42 needs to be opened. At this time, the low-temperature and low-pressure liquid refrigerant that has been throttled and depressurized by the primary throttling element takes two paths. The refrigerant in one path enters the indoor heat exchanger 10, and the refrigerant in another path, after passing through the first throttling element 42 and entering the heat exchanger 41 (having the third end and the fourth end being in communication with each other) for heat exchange, returns to the return gas port of the compressor 50, to reduce the return gas temperature of the compressor 50. When the return gas temperature of the compressor 50 returns to a normal range, regardless of whether the first throttling element 42 is in the open state or in the closed state, the refrigerant exists in the gas phase and the liquid phase inside the heat exchanger 41 and in the circuit from the heat exchanger 41 to the compressor, resulting in the decrease in the total amount of system refrigerant and the decrease in the performance.

[0036] When the above-described situations occur, the liquid discharge control logic needs to be executed. How to achieve liquid discharge is described below.

[0037] In some embodiments of the present disclosure, when controlling the liquid discharge solenoid valve 31 to be opened, the controller is further configured to: adjust an opening degree of the first throttling element 42 in the enthalpy-increasing pipeline to a predetermined opening degree.

[0038] Further, in some embodiments of the present disclosure, subsequent to adjusting the opening degree of the first throttling element 42 to the predetermined opening degree, the controller is further configured to: obtain an outlet temperature and an inlet temperature of the heat exchanger 41, and adjust the opening degree of the first throttling element 42, to cause a temperature difference between the outlet temperature and the inlet temperature of the heat exchanger to be greater than a first predetermined temperature threshold. The first predetermined temperature threshold may be calibrated based on actual conditions

[0039] When the liquid discharge condition is satisfied, since a state of the first throttling element 42 (whether the first throttling element is in the open state or in the closed state) is uncertain, the opening degree of the first throttling element 42 may be adjusted to a small opening degree to allow the refrigerant to flow, and the opening degree of the first throttling element 42 is adjusted to cause a superheat degree of the heat exchanger 41 to be greater than a predetermined superheat degree, that is, the temperature difference between the outlet temperature (T6B) of the heat exchanger 41 and the inlet temperature (T6A) of the heat exchanger 42 is greater than a determined value, and the refrigerant flowing into the heat exchanger 41 is reduced as much as possible. Also, the liquid discharge solenoid valve 31 is controlled to be opened. Since the refrigerant at the first throttling element 42 is at a medium pressure and the refrigerant at the return gas port of the compressor 50 is at a low pressure, when the liquid discharge solenoid valve 31 is opened, the refrigerant returns to the return gas port of the compressor 50 through the liquid discharge pipeline under the action of the pressure difference.

[0040] Further, in some embodiments of the present disclosure, the controller is further configured to: subsequent to delaying for a first predetermined period, control the first throttling element to be closed, and subsequent to delaying for a second predetermined period, control the liquid discharge solenoid valve to be closed. The first predetermined period and the second predetermined period may be calibrated based on actual conditions.

[0041] Subsequent to the liquid discharge solenoid valve 31 being opened for the first predetermined period, the first throttling element 42 is controlled to be closed, in such a manner that the refrigerant at a primary circuit can be prevented from flowing into the enthalpy-increasing pipeline through the first throttling element 42. When the first throttling element 42 is closed, the liquid discharge solenoid valve 31 is closed subsequent to delaying for the second predetermined period, to further ensure that no residual refrigerant exists in the enthalpy-increasing pipeline. In this way, not only the refrigerant in the pipeline can be discharged, but also the refrigerant remaining in the heat exchanger of the enthalpy-increasing pipeline can be discharged, to further improve system energy efficiency.

[0042] It should be noted that, when the air conditioner is in the cooling mode or the heating mode, and the first throttling element is in the closed state, the liquid discharge solenoid valve may be controlled to be in an open state without considering an outlet superheat degree of the heat exchanger. In this way, most of the accumulated liquid in a flow path from the first throttling element to the one-way valve can be discharged. However, the refrigerant in the heat exchanger can not be ensured to be discharged, so the liquid discharge effect is suboptimal.

[0043] In summary, in the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, the liquid discharge pipeline is provided. The liquid discharge pipeline has the end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor. The liquid discharge pipeline is provided with the liquid discharge solenoid valve. The controller is configured to determine that the predetermined liquid discharge condition is satisfied during the operation of the system, and control the liquid discharge solenoid valve to be opened. In this way, the system is provided with the liquid discharge pipeline at the enthalpy-increasing pipeline, and the liquid discharge pipeline is connected to the return gas port of the compressor. When the system satisfies the liquid discharge condition, the liquid discharge solenoid valve is controlled to be opened, to discharge the liquid from the enthalpy-increasing line. In this way, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0044] Corresponding to the above-described embodiments, the present disclosure further provides a control method for a vapor injection enthalpy-increasing air conditioning system.

[0045] FIG. 2 is a flowchart of the control method for a vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure.

[0046] In some embodiments of the present disclosure, the system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, a third end connected to a return gas port of a compressor; and a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor. The liquid discharge pipeline is provided with a liquid discharge solenoid valve. The control method according to the present disclosure is applicable to a controller.

[0047] As illustrated in FIG. 2, the control method for the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure may comprise the following steps S1 and S2.

[0048] At step S1, it is determined that a predetermined liquid discharge condition is satisfied during operation of the system.

[0049] At step S2, the liquid discharge solenoid valve is controlled to be opened.

[0050] In some embodiments of the present disclosure, the method further comprises, when controlling the liquid discharge solenoid valve to be opened, adjusting an opening degree of a first throttling element in the enthalpy-increasing pipeline to a predetermined opening degree.

[0051] In some embodiments of the present disclosure, the above-described system further comprises a heat exchanger disposed at the enthalpy-increasing pipeline. The heat exchanger has a first end connected to the indoor heat exchanger, a second end connected to the outdoor heat exchanger, a third end connected to the second end of the heat exchanger through the first throttling element, and a fourth end connected to the discharge port of the compressor. The method further comprises, subsequent to adjusting the opening degree of the first throttling element to the predetermined opening degree, obtaining an outlet temperature and an inlet temperature of the heat exchanger, and adjusting the opening degree of the first throttling element, to cause a temperature difference between the outlet temperature and the inlet temperature of the heat exchanger to be greater than a first predetermined temperature threshold.

[0052] In some embodiments of the present disclosure, the above-described method further comprises: subsequent to delaying for a first predetermined period, controlling the first throttling element to be closed, and subsequent to delaying for a second predetermined period, controlling the liquid discharge solenoid valve to be closed.

[0053] In some embodiments of the present disclosure, determining that the predetermined liquid discharge condition is satisfied comprises: determining an operating mode of the air conditioning system being a cooling mode; or determining the operating mode of the air conditioning system being switched from a heating mode to the cooling mode; or determining the operating mode of the air conditioning system being switched from a enthalpy-increasing heating mode to a non-enthalpy-increasing heating mode; or determining a return gas temperature of the compressor being greater than a predetermined temperature value when the air conditioning system is operating in the cooling mode.

[0054] In some embodiments of the present disclosure, the above-described system further comprises a second throttling element disposed at the liquid discharge pipeline. The second throttling element has an end connected to the liquid discharge solenoid valve, and another end connected to the return gas port of the compressor.

[0055] It should be noted that, for details not disclosed in the control method for the vapor injection enthalpy-increasing air conditioning system in the embodiments of the present disclosure, reference can be made to the details disclosed in the vapor injection enthalpy-increasing air conditioning system in the embodiments of the present disclosure, and detailed description will not be repeated here.

[0056] The control method for the vapor injection enthalpy-increasing air conditioning system is provided according to some embodiments of the present disclosure. It is determined that the predetermined liquid discharge condition is satisfied during the operation of the system, and the liquid discharge solenoid valve is controlled to be opened. With the method, when the system satisfies the liquid discharge condition, the liquid discharge solenoid valve is controlled to be opened, to discharge the liquid from the enthalpy-increasing line. In this way, the system performance degradation caused by the liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0057] Corresponding to the above-described embodiments, the present disclosure provides a control apparatus for a vapor injection enthalpy-increasing air conditioning system.

[0058] In some embodiments of the present disclosure, the system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, a third end connected to a return gas port of a compressor; and a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and another end connected to the return gas port of the compressor. The liquid discharge pipeline is provided with a liquid discharge solenoid valve.

[0059] As illustrated in FIG. 3, a control apparatus 200 for the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure may comprise a determining module 210 and a control module 220.

[0060] The determining module 210 is configured to determine that a predetermined liquid discharge condition is satisfied during operation of the system. The control module 220 is configured to control the liquid discharge solenoid valve to be opened.

[0061] In some embodiments of the present disclosure, the control module 220 is configured to, when a controller controls the liquid discharge solenoid valve to be opened, adjust an opening degree of a first throttling element in the enthalpy-increasing pipeline to a predetermined opening degree.

[0062] In some embodiments of the present disclosure, the above-described system further comprises a heat exchanger disposed at the liquid discharge pipeline. The heat exchanger has a first end connected to the indoor heat exchanger, a second end connected to the outdoor heat exchanger, a third end connected to the second end of the heat exchanger through the first throttling element, and a fourth end connected to the discharge port of the compressor. The control module 220 is further configured to, subsequent to adjusting the opening degree of the first throttling element to the predetermined opening degree: obtain an outlet temperature and an inlet temperature of the heat exchanger, and adjust the opening degree of the first throttling element, to cause a temperature difference between the outlet temperature and the inlet temperature of the heat exchanger to be greater than a first predetermined temperature threshold.

[0063] According to some embodiments of the present disclosure, the control module 220 is further configured to: subsequent to delaying for a first predetermined period, control the first throttling element to be closed, and subsequent to delaying for a second period, control the liquid discharge solenoid valve to be closed.

[0064] According to some embodiments of the present disclosure, the determining module 210 is configured to, when the controller determines that the predetermined liquid discharge condition is satisfied,: determine an operating mode of the air conditioning system to be a cooling mode; or determine the operating mode of the air conditioning system to be switched from a heating mode to the cooling mode; or determine the operating mode of the air conditioning system to be switched from an enthalpy-increasing heating mode to a non-enthalpy-increasing heating mode; or determine a return gas temperature of the compressor to be greater than a predetermined temperature value when the air conditioning system is operating in the cooling mode.

[0065] According to some embodiments of the present disclosure, the above-described system further comprises a second throttling element disposed at the liquid discharge pipeline. The second throttling element has an end connected to the liquid discharge solenoid valve, and another end connected to the return gas port of the compressor.

[0066] It should be noted that, for details not disclosed in the control apparatus for the vapor injection enthalpy-increasing air conditioning system in the embodiments of the present disclosure, reference can be made to the details disclosed in the vapor injection enthalpy-increasing air conditioning system in the embodiments of the present disclosure, and detailed description will not be repeated here.

[0067] With the control apparatus for the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, the determining module determines that the predetermined liquid discharge condition is satisfied during the operation of the system, and the control module controls the liquid discharge solenoid valve to be opened. Therefore, when the system satisfies the liquid discharge condition, the apparatus can control the liquid discharge solenoid valve to be opened, to discharge liquid from the enthalpy-increasing line. In this way, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0068] Corresponding to the above-described embodiments, the present disclosure further provides a computer-readable storage medium.

[0069] The computer-readable storage medium of the present disclosure has a control program for a vapor injection enthalpy-increasing air conditioning system stored thereon. The control program for the vapor injection enthalpy-increasing air conditioning system, when executed by a processor, implements the above-described vapor injection enthalpy-increasing air conditioning system.

[0070] With the computer-readable storage medium according to some embodiments of the present disclosure, by executing the above-described vapor injection enthalpy-increasing air conditioning system, system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0071] Corresponding to the above-described embodiments, the present disclosure further provides a vapor injection enthalpy-increasing air conditioning system.

[0072] As illustrated in FIG. 4, a vapor injection enthalpy-increasing air conditioning system 100 provided in the present disclosure comprises a memory 110, a processor 120, and a control program for the vapor injection enthalpy-increasing air conditioning system stored in the memory 110 and executable by the processor 120. When the control program for the vapor injection enthalpy-increasing air conditioning system is executed by the processor 120, the above-described control method for the vapor injection enthalpy-increasing air conditioning system is implemented.

[0073] With the vapor injection enthalpy-increasing air conditioning system according to some embodiments of the present disclosure, by executing above-described control method for the vapor injection enthalpy-increasing air conditioning system, t system performance degradation caused by liquid accumulation can be avoided, and the system energy efficiency can be improved.

[0074] It should be noted that, the logic and / or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function, may be achieved in any computer-readable medium to be used by the instruction execution system, apparatus or device (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, apparatus and device and executing the instruction), or to be used in combination with the instruction execution system, apparatus and device. As to the specification, "the computer-readable medium" may be any apparatus adaptive for comprising, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, apparatus or device. More specific examples of the computer-readable medium comprise but are not limited to: an electronic connection (an electronic apparatus) with one or more wires, a portable computer enclosure (a magnetic apparatus), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber apparatus and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.

[0075] It should be understood that each part of the present disclosure may be realized by the hardware, software, firmware or their combination. In the above embodiments, a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instruction execution system. For example, if it is realized by the hardware, likewise in another embodiment, the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0076] Reference throughout this specification to "an embodiment," "some embodiments," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is comprised in at least one embodiment or example of the present disclosure. The appearances of the above phrases in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0077] In addition, terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance, or to implicitly show the number of technical features indicated. Thus, the feature defined with "first" and "second" may explicitly or implicitly comprise one or more this feature. In the description of the present disclosure, "a plurality of" means two or more, unless specified otherwise.

[0078] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, terms such as "install", "connect", "connect to", and the like should be understood in a broad sense. For example, it may be a fixed connection or a detachable connection or connection as one piece; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate; internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above-described terms in the present disclosure can be understood according to specific circumstances.

[0079] Although embodiments of the present disclosure have been shown and described above, it should be understood that above embodiments are merely exemplary, and cannot be construed to limit the present disclosure. For those skilled in the art, various changes, modifications, replacements, and variations can be made to the embodiments without departing from the scope of the present disclosure.

Claims

1. A vapor injection enthalpy-increasing air conditioning system, comprising: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, and a third end connected to a return gas port of a compressor; a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and an other end connected to the return gas port of the compressor, wherein the liquid discharge pipeline is provided with a liquid discharge solenoid valve; and a controller configured to determine that a predetermined liquid discharge condition is satisfied during operation of the system, and control the liquid discharge solenoid valve to be opened.

2. The system according to claim 1, wherein the controller is further configured to, when controlling the liquid discharge solenoid valve to be opened: adjust an opening degree of a first throttling element in the enthalpy-increasing pipeline to a predetermined opening degree.

3. The system according to claim 2, further comprising: a heat exchanger disposed at the enthalpy-increasing pipeline, wherein the heat exchanger has a first end connected to the indoor heat exchanger, a second end connected to the outdoor heat exchanger, a third end connected to the second end of the heat exchanger through the first throttling element, and a fourth end connected to a discharge port of the compressor; and wherein the controller is further configured to, subsequent to adjusting the opening degree of the first throttling element to the predetermined opening degree: obtain an outlet temperature and an inlet temperature of the heat exchanger, and adjust the opening degree of the first throttling element, to cause a temperature difference between the outlet temperature and the inlet temperature of the heat exchanger to be greater than a first predetermined temperature threshold.

4. The system according to claim 2, wherein the controller is further configured to: subsequent to delaying for a first predetermined period, control the first throttling element to be closed, and subsequent to delaying for a second predetermined period, control the liquid discharge solenoid valve to be closed.

5. The system according to claim 1, wherein the controller, when configured to determine that the predetermined liquid discharge condition is satisfied, is configured to: an operating mode of the air conditioning system to be a cooling mode; or the operating mode of the air conditioning system to be switched from a heating mode to the cooling mode; or the operating mode of the air conditioning system to be switched from an enthalpy-increasing heating mode to a non-enthalpy-increasing heating mode; or a return gas temperature of the compressor to be greater than a predetermined temperature value when the air conditioning system is operating in the cooling mode.

6. The system according to claim 1, further comprising: a second throttling element disposed at the liquid discharge pipeline, wherein the second throttling element has an end connected to the liquid discharge solenoid valve, and an other end connected to the return gas port of the compressor.

7. A control method for a vapor injection enthalpy-increasing air conditioning system, wherein the system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, and a third end connected to a return gas port of a compressor; and a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and an other end connected to the return gas port of the compressor, wherein the liquid discharge pipeline is provided with a liquid discharge solenoid valve; and wherein the method comprises: determining that a predetermined liquid discharge condition is satisfied during operation of the system; and controlling the liquid discharge solenoid valve to be opened.

8. A control apparatus for a vapor injection enthalpy-increasing air conditioning system, wherein the system comprises: an enthalpy-increasing pipeline having a first end connected to an indoor heat exchanger, a second end connected to an outdoor heat exchanger, and a third end connected to a return gas port of a compressor; and a liquid discharge pipeline having an end connected to the third end of the enthalpy-increasing pipeline, and an other end connected to the return gas port of the compressor, wherein the liquid discharge pipeline is provided with a liquid discharge solenoid valve; and the apparatus comprising: a determining module configured to determine that a predetermined liquid discharge condition is satisfied during operation of the system; and a control module configured to control the liquid discharge solenoid valve to be opened, and subsequent to delaying for a first predetermined period, control the liquid discharge solenoid valve to be closed.

9. A computer-readable storage medium having a control program for a vapor injection enthalpy-increasing air conditioning system stored thereon, wherein the control program for the vapor injection enthalpy-increasing air conditioning system, when executed by a processor, implements a control method for the vapor injection enthalpy-increasing air conditioning system according to claim 7.

10. A vapor injection enthalpy-increasing air conditioning system, comprising a memory, a processor, and a control program for the vapor injection enthalpy-increasing air conditioning system stored in the memory and executable by the processor, wherein when the control program for the vapor injection enthalpy-increasing air conditioning system is executed by the processor, a control method for the vapor injection enthalpy-increasing air conditioning system according to claim 7 is implemented.

Images