Heat pump system and control method of heat pump system

Abstract

The invention relates to the technical field of heat pumps, and particularly discloses a heat pump system and a control method of the heat pump system.The system comprises a two-stage compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger, a first electronic expansion valve and a heat regenerator; the heat pump system is provided with a heat exchange main path and a first heat exchange branch path. The double-stage compressor, the four-way valve, the outdoor heat exchanger, the heat regenerator, the indoor heat exchanger, the four-way valve, the first electronic expansion valve and the heat regenerator are sequentially connected to form the heat exchange main path. The opening degree of the first electronic expansion valve is adjusted, so that a refrigerant and a refrigerant are effectively throttled through the electronic expansion valves, the compression ratio during operation of the heat pump system is reduced, middle exhaust of the two-stage compressor is cooled, the air suction temperature of a high-pressure cavity is reduced, and the heat exchange performance and the system energy efficiency of the heat pump system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a heat pump system and a control method for the heat pump system. Background Art

[0002] In the double-stage compressor of the existing heat pump system, the intermediate cooling form from the exhaust of the low-pressure chamber to the suction of the high-pressure chamber is cooled by supplementing low-temperature gas or liquid in the middle. This cooling method is affected by the gas supplement amount. If the intermediate gas supplement is saturated or superheated gas, the gas supplement amount is small at this time, and the cooling effect is poor, resulting in a high temperature of the refrigerant entering the high-pressure chamber and a high exhaust temperature. If the intermediate gas supplement is a gas-liquid two-phase refrigerant, it is very difficult to control the liquid refrigerant intake, and the gasification of the liquid refrigerant generates expansion, which has a negative effect on the system. The compressor energy efficiency of the double-stage compression intermediate gas supplement cooling scheme (intermediate incomplete cooling) is low.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to provide a heat pump system and a control method for the heat pump system, aiming to solve the technical problems of high temperature of the intake air in the high-pressure chamber and low compression efficiency during the intermediate gas supplement process from the exhaust of the low-pressure chamber to the intake of the high-pressure chamber in the double-stage compressor of the existing heat pump system.

[0005] To achieve the above object, the present invention provides a heat pump system. The heat pump system includes a double-stage compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger, a first electronic expansion valve, and a regenerator. The double-stage compressor includes a low-pressure chamber and a high-pressure chamber. The heat pump system forms a main heat exchange path and a first heat exchange branch. The double-stage compressor, the four-way valve, the outdoor heat exchanger, the regenerator, the indoor heat exchanger, the four-way valve, the first electronic expansion valve, and the regenerator are sequentially connected to form the main heat exchange path. The main heat exchange path includes a heat exchange pipe section connecting the exhaust port of the low-pressure chamber and the suction port of the high-pressure chamber. The heat exchanger is arranged in the first heat exchange branch and the heat exchange pipe section. The first heat exchange branch can exchange heat with the heat exchange pipe section through the heat exchanger. One end of the first heat exchange branch is connected between the four-way valve and the first electronic expansion valve, and the other end of the first heat exchange branch is connected between the first electronic expansion valve and the regenerator.

[0006] Optionally, the heat pump system further includes a subcooling heat exchanger and a second electronic expansion valve, and the heat pump system further forms a second heat exchange branch;

[0007] The supercooling heat exchanger is disposed in the main heat exchange path and the second heat exchange branch between the regenerator and the indoor heat exchanger. One end of the second heat exchange branch is connected to the main heat exchange path between the regenerator and the supercooling heat exchanger, and the other end of the second heat exchange branch is connected to the suction port of the high-pressure chamber. The second electronic expansion valve is disposed between the connection node between the second heat exchange branch and the main heat exchange path and the supercooling heat exchanger, and is located in the second heat exchange branch.

[0008] Optionally, the heat pump system further includes a check valve, the check valve is disposed in the second heat exchange branch and between the supercooling heat exchanger and the suction port of the high-pressure chamber, and the conduction direction of the check valve is from the supercooling heat exchanger to the suction port of the high-pressure chamber.

[0009] Optionally, the heat pump system further includes: a third electronic expansion valve and / or a fourth electronic expansion valve;

[0010] The third electronic expansion valve is disposed between the indoor heat exchanger and the supercooling heat exchanger and is located in the main heat exchange path; and / or

[0011] The fourth electronic expansion valve is disposed between the outdoor heat exchanger and the regenerator and is located in the main heat exchange path.

[0012] In addition, to achieve the above object, the present invention provides a heat pump system control method, the heat pump system control method is applied to the above heat pump system, and the heat pump system control method includes:

[0013] Obtain the inlet saturation temperature and the suction port temperature of the high-pressure chamber, and the outdoor ambient temperature;

[0014] Determine the intake air temperature difference according to the inlet saturation temperature and the suction port temperature; and

[0015] Adjust at least one of the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake air temperature difference.

[0016] Optionally, the obtaining the inlet saturation temperature and the suction port temperature of the high-pressure chamber includes:

[0017] Obtain the suction port pressure of the high-pressure chamber; and

[0018] Determine the inlet saturation temperature and the suction port temperature of the high-pressure chamber based on the suction port pressure.

[0019] Optionally, the adjusting at least one of the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake air temperature difference includes:

[0020] Obtain the current working mode;

[0021] When the working mode is the heating mode, determine whether the outdoor ambient temperature exceeds a first preset temperature;

[0022] If the outdoor ambient temperature exceeds the first preset temperature, set the default opening degree of the first electronic expansion valve to a first default opening degree;

[0023] Determine whether the intake air temperature difference exceeds a preset threshold, and adjust the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference determination result and the first default opening degree;

[0024] If the outdoor ambient temperature does not exceed the first preset temperature, set the default opening degree of the first electronic expansion valve to a second default opening degree; and

[0025] Determine whether the intake air temperature difference exceeds a preset threshold, and adjust the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference determination result and the second default opening degree.

[0026] Optionally, the determining whether the intake air temperature difference exceeds a preset threshold, and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference determination result and the first default opening degree includes:

[0027] Determine whether the intake air temperature difference exceeds a preset threshold;

[0028] If the intake air temperature difference exceeds the preset threshold, adjust the opening degree of the first electronic expansion valve based on the first default opening degree, and adjust the opening degree of the second electronic expansion valve to a first target opening degree;

[0029] If the intake air temperature difference does not exceed the preset threshold, determine whether the intake air temperature difference is within a preset range;

[0030] If the intake air temperature difference is within the preset range, control the second electronic expansion valve to maintain the current opening degree; and

[0031] If the intake air temperature difference is not within the preset range, adjust the opening degree of the first expansion valve to a second target opening degree.

[0032] Optionally, the determining whether the intake air temperature difference exceeds a preset threshold, and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference determination result and the second default opening degree includes:

[0033] Determine whether the intake air temperature difference exceeds a preset threshold;

[0034] If the intake air temperature difference exceeds the preset threshold, adjust the first electronic expansion valve to a third target opening based on the second default opening;

[0035] If the intake air temperature difference does not exceed the preset threshold, determine whether the intake air temperature difference is within a preset range;

[0036] If the intake air temperature difference is within the preset range, control the first electronic expansion valve to maintain the current opening; and

[0037] If the intake air temperature difference is not within the preset range, adjust the opening of the first expansion valve to a fourth target opening based on the second default opening.

[0038] Optionally, after obtaining the current working mode, it further includes:

[0039] When the working mode is the refrigeration mode, determine whether the outdoor ambient temperature exceeds a second preset temperature;

[0040] If the outdoor ambient temperature does not exceed the second preset temperature, set the default opening of the second electronic expansion valve to a first default opening;

[0041] If the outdoor ambient temperature exceeds the second preset temperature, set the default opening of the second electronic expansion valve to a second default opening, and determine whether the intake air temperature difference exceeds the preset threshold; and

[0042] Adjust the opening of the first electronic expansion valve and the opening of the second electronic expansion valve based on the difference judgment result and the second default opening.

[0043] Optionally, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve based on the difference judgment result and the second default opening includes:

[0044] If the intake air temperature difference exceeds the preset threshold, determine whether the suction port temperature of the high-pressure chamber exceeds a third preset temperature, and adjust the opening of the second electronic expansion valve based on the temperature judgment result; and

[0045] If the intake air temperature difference does not exceed the preset threshold, determine whether the intake air temperature difference is within a preset range, and adjust the opening of the first electronic expansion valve and the opening of the second electronic expansion valve based on the range judgment result and the second default opening.

[0046] In addition, to achieve the above object, the present invention further provides a control device for a heat pump system, the control device for the heat pump system comprising:

[0047] A data acquisition module, configured to obtain the inlet saturation temperature and the suction port temperature of the high-pressure chamber, as well as the outdoor ambient temperature;

[0048] A difference calculation module, configured to determine an intake air temperature difference according to the inlet saturation temperature and the suction port temperature; and

[0049] An opening adjustment module, configured to adjust the opening of at least one of the first electronic expansion valve and the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake air temperature difference.

[0050] In addition, to achieve the above object, the present invention further provides a control device for a heat pump system, the control device for the heat pump system comprising: a memory, a processor, and a heat pump system control program stored on the memory and executable on the processor, the heat pump system control program being configured to implement the steps of the heat pump system control method as described above.

[0051] In addition, to achieve the above object, the present invention further provides a storage medium, on which a heat pump system control program is stored, the heat pump system control program, when executed by a processor, implementing the steps of the heat pump system control method as described above.

[0052] The present invention provides a heat pump system, the heat pump system comprising a two-stage compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger, a first electronic expansion valve, and a regenerator, the two-stage compressor comprising a low-pressure chamber and a high-pressure chamber; since the present invention adjusts the opening of the first electronic expansion valve in the above heat pump system based on the outdoor ambient temperature and the recent temperature difference between the inlet saturation temperature and the suction port temperature of the high-pressure chamber, thereby effectively throttling the refrigerant and the refrigerant medium through the electronic expansion valve, reducing the compression ratio during the operation of the heat pump system, cooling the intermediate exhaust of the two-stage compressor, reducing the high-pressure chamber suction temperature, improving the heat exchange performance and reliability of the heat pump system, and effectively improving the system energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a schematic structural diagram of a heat pump system in an embodiment of the present invention;

[0054] Figure 2 is a schematic structural diagram of a control device for a heat pump system, which is a hardware operating environment involved in the embodiment solution of the present invention;

[0055] Figure 3 is a schematic flowchart of a first embodiment of the heat pump system control method of the present invention;

[0056] Figure 4 This is a two-stage air supplementation cooling compression Ph diagram in one embodiment of the present invention;

[0057] Figure 5 It is a schematic diagram of the heat recovery control process of the heat pump system in one embodiment of the present invention;

[0058] Figure 6 This is a schematic diagram of a refrigeration system of a heat pump system in one embodiment of the present invention;

[0059] Figure 7 This is a schematic diagram of a refrigeration heat recovery control process in one embodiment of the present invention;

[0060] Figure 8 This is a structural block diagram of the first embodiment of the heat pump system control device of the present invention.

[0061] Description of Figure Numbers:

[0062] Label Name Label Name 1 Heat exchanger 2 Suction port of the two-stage compressor 3 Discharge port of the low-pressure chamber 4 Suction port of the high-pressure chamber 5 Discharge port of the two-stage compressor 6 Oil separator 7 Four-way valve 8 Indoor heat exchanger 9 Third electronic expansion valve 10 Subcooling heat exchanger 11 Second electronic expansion valve 12 Fourth electronic expansion valve 13 Outdoor heat exchanger 14 First electronic expansion valve 15 Regenerator 16 Oil return capillary tube 17 Check valve T1 First-stage discharge temperature sensor T2 Second-stage discharge temperature sensor T3 Indoor heat exchanger temperature sensor T4 Outdoor heat exchanger temperature sensor P1 First-stage compression pressure sensor P2 Discharge pressure sensor P3 Suction pressure sensor A Two-stage compressor L Low-pressure chamber H High-pressure chamber

[0063] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0064] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0065] The embodiment of the present invention provides a heat pump system, referring to Figure 1 , Figure 1 Schematic diagram of the structure of the heat pump system, the heat pump system includes a two-stage compressor A, a four-way valve 7, an outdoor heat exchanger 13, an indoor heat exchanger 8, a heat exchanger, a first electronic expansion valve 14 and a regenerator 15, the two-stage compressor A includes a low-pressure chamber L and a high-pressure chamber H, the heat pump system forms a heat exchange main circuit and a first heat exchange branch circuit, the two-stage compressor A, the four-way valve 7, the outdoor heat exchanger 13, the regenerator 15, the indoor heat exchanger 8, the four-way valve 7, the first electronic expansion valve 14 and the regenerator 15 5 are connected in sequence to form the heat exchange main path, the heat exchange main path includes a heat exchange pipe section connecting the exhaust port 3 of the low-pressure chamber L and the intake port 4 of the high-pressure chamber H, the heat exchanger is arranged in the first heat exchange branch and the heat exchange pipe section, the first heat exchange branch can exchange heat with the heat exchange pipe section through the heat exchanger, one end of the first heat exchange branch is connected between the four-way valve 7 and the first electronic expansion valve 14, and the other end of the first heat exchange branch is connected between the first electronic expansion valve 14 and the regenerator 15.

[0066] Furthermore, the heat pump system further comprises a subcooling heat exchanger 10 and a second electronic expansion valve 11, and the heat pump system further forms a second heat exchange branch;

[0067] The subcooling heat exchanger 10 is disposed in the main heat exchange path and the second heat exchange branch between the regenerator 15 and the indoor heat exchanger 8. One end of the second heat exchange branch is connected to the main heat exchange path between the regenerator 15 and the subcooling heat exchanger 10, and the other end of the second heat exchange branch is connected to the suction port 4 of the high-pressure chamber H. The second electronic expansion valve 11 is disposed between the connection node between the second heat exchange branch and the main heat exchange path and the subcooling heat exchanger 10 and is located in the second heat exchange branch.

[0068] Further, the heat pump system further includes a check valve 17. The check valve 17 is disposed in the second heat exchange branch and between the subcooling heat exchanger 10 and the suction port 4 of the high-pressure chamber H. The conducting direction of the check valve 17 is from the subcooling heat exchanger 10 to the suction port 4 of the high-pressure chamber H.

[0069] Further, the heat pump system further includes: a third electronic expansion valve 9 and / or a fourth electronic expansion valve 12;

[0070] The third electronic expansion valve 9 is disposed between the indoor heat exchanger 8 and the subcooling heat exchanger 10 and is located in the main heat exchange path; and / or

[0071] The fourth electronic expansion valve 12 is disposed between the outdoor heat exchanger 13 and the regenerator 15 and is located in the main heat exchange path.

[0072] It can be understood that the heat pump system further includes: an oil return capillary and an oil separator; the subcooling heat exchanger is respectively connected to the second electronic expansion valve and the intake port of the high-pressure chamber, and a check valve is further connected between the subcooling heat exchanger and the intake port of the high-pressure chamber; the indoor heat exchanger 8 is respectively connected to the subcooling heat exchanger and the four-way valve; the oil separator is respectively connected to the exhaust port of the high-pressure chamber and the four-way valve, and the oil separator is further connected to the return air port of the low-pressure chamber, and the oil return capillary is further connected between the oil separator and the return air port; the four-way valve is further respectively connected to the heat exchanger and the outdoor unit heat exchanger.

[0073] It should be noted that the above regenerator 15 may be a heat regenerator tank, and the above heat exchanger may be a heat regeneration heat exchanger.

[0074] It can be understood that during the heating process of the heat pump system, the refrigerant flows as Figure 1As shown by the solid arrows. The refrigerant flows from the compressor exhaust port to the four-way valve 7 and enters the indoor unit for condensation and heat dissipation (heating). After heat dissipation, the refrigerant passes through the third electronic expansion valve 9 (fully open), and then enters the subcooling heat exchanger. A part of the refrigerant passes through the second electronic expansion valve 11 for throttling, evaporates and absorbs heat in the subcooling heat exchanger and becomes gaseous and flows to the suction port of the high-pressure chamber H; another part of the refrigerant flows into the regenerator 15 to exchange heat with the return gas to increase the superheat degree of the return gas. The refrigerant after heat exchange is in a subcooled state and passes through the fourth electronic expansion valve 12 for throttling and enters the outdoor heat exchanger for evaporation and heat absorption, and then enters the heat exchanger again for evaporation and heat absorption (the refrigerant flowing out of the outdoor unit is not completely evaporated into a gaseous state). The refrigerant coming out of the heat exchanger enters the regenerator 15 again to absorb heat. After heat absorption, the refrigerant becomes saturated or supersaturated gaseous and enters the compressor suction port, is compressed through the low-pressure chamber L and discharged as superheated gas, enters the heat exchanger for condensation, and then enters the high-pressure chamber H for compression and discharge. This cycle repeats.

[0075] It should be understood that, referring to Figure 6 , Figure 6 is the schematic diagram of the refrigeration system of the heat pump system. As shown in Figure 6 , the main components of the heat pump system include a two-stage compressor, a four-way valve 7, a regenerative heat exchanger, an indoor heat exchanger 8, an electronic expansion valve, an oil separator 6, a subcooling heat exchanger, an outdoor heat exchanger, a temperature sensor, a pressure sensor, a check valve 17, etc. The refrigerant flow during the refrigeration process is as shown by the solid arrows in Figure 6 . When the outdoor temperature is lower than b °C during refrigeration, the second electronic expansion valve 11 is default in the fully closed state, and the superheat degree c of the first-stage exhaust is adjusted and controlled by adjusting the first electronic expansion valve 14.

[0076] In this embodiment, a heat pump system is provided. Based on the outdoor ambient temperature and the recent temperature difference between the inlet saturation temperature and the suction port temperature of the high-pressure chamber, the opening degrees of the first electronic expansion valve and the second electronic expansion valve are adjusted, so as to effectively throttle the refrigerant and the refrigerant medium through the electronic expansion valve, reduce the compression ratio during the operation of the heat pump system, cool the intermediate exhaust of the two-stage compressor, reduce the suction temperature of the high-pressure chamber, improve the heat exchange performance and reliability of the heat pump system, and effectively improve the system energy efficiency.

[0077] Referring to Figure 2 , Figure 2 is the schematic structural diagram of the control device of the heat pump system for the hardware operating environment involved in the embodiment of the present invention.

[0078] As shown in Figure 2As shown in the figure, the control device of the heat pump system may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed Random Access Memory (RAM) or a stable Non-Volatile Memory (NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0079] Those skilled in the art can understand that Figure 2 the structure shown in does not constitute a limitation on the control device of the heat pump system, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0080] As Figure 2 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a heat pump system control program.

[0081] In Figure 2 the control device of the heat pump system shown in the figure, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with users; the processor 1001 and the memory 1005 in the control device of the heat pump system of the present invention may be provided in the control device of the heat pump system. The control device of the heat pump system calls the heat pump system control program stored in the memory 1005 through the processor 1001 and executes the heat pump system control method provided by the embodiments of the present invention.

[0082] The embodiments of the present invention provide a heat pump system control method. Referring to Figure 3 , Figure 3 is a schematic flowchart of the first embodiment of a heat pump system control method of the present invention.

[0083] In this embodiment, the heat pump system control method includes the following steps:

[0084] Step S10: Obtain the inlet saturation temperature and the suction port temperature of the high-pressure chamber, as well as the outdoor ambient temperature.

[0085] It should be understood that the execution subject of this embodiment is a controller, mainly a controller connected to the heat pump system, which can be a device capable of controlling the opening, adjustment, and switching of each component of the heat pump system, and can perform data processing and transmission. It can also be other devices that can achieve this function. This embodiment does not limit this.

[0086] It should be noted that the heat pump system control method described in this embodiment is applied to the heat pump system. Refer to Figure 1 , Figure 1 which is a schematic structural diagram of the heat pump system. The heat pump system includes a two-stage compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger, a first electronic expansion valve, and a regenerator. The two-stage compressor includes a low-pressure chamber and a high-pressure chamber. The heat pump system forms a main heat exchange path and a first heat exchange branch. The two-stage compressor, the four-way valve, the outdoor heat exchanger, the regenerator, the indoor heat exchanger, the four-way valve, the first electronic expansion valve, and the regenerator are sequentially connected to form the main heat exchange path. The main heat exchange path includes a heat exchange pipe section connecting the exhaust port of the low-pressure chamber and the suction port of the high-pressure chamber. The heat exchanger is arranged in the first heat exchange branch and the heat exchange pipe section. The first heat exchange branch can exchange heat with the heat exchange pipe section through the heat exchanger. One end of the first heat exchange branch is connected between the four-way valve and the first electronic expansion valve, and the other end of the first heat exchange branch is connected between the first electronic expansion valve and the regenerator.

[0087] It should be noted that the above regenerator 15 can be a regenerative tank, and the above heat exchanger can be a regenerative heat exchanger.

[0088] Further, in order to accurately obtain the inlet saturation temperature of the high-pressure chamber H, the above step S10 may include:

[0089] Obtain the suction port pressure of the high-pressure chamber; and

[0090] Based on the suction port pressure, determine the inlet saturation temperature and the suction port temperature of the high-pressure chamber.

[0091] It should be noted that measuring the temperature and pressure at the suction port 4 of the high-pressure chamber H means measuring the temperature and pressure at point 4 in Figure 1 , and then calculating the saturation temperature at the suction port 4 of the high-pressure chamber H according to the suction port 4 pressure. The saturation temperature at the suction port 4 is calculated through a preset program. Specifically, it can be calculated with reference to the pressure-enthalpy diagram. When the suction port 4 pressure is determined, the only determined value can be obtained as the saturation temperature at the suction port 4.

[0092] Step S20: Determine the intake air temperature difference based on the imported saturation temperature and the suction port temperature.

[0093] It should be understood that after calculating the saturation temperature of the suction port 4, the intake air temperature difference is determined by taking the difference, and then the opening degree of the electronic expansion valve is adjusted according to the intake air temperature difference, so that the refrigerant flow rate flowing into the heat exchanger can be changed by the change of the opening degree of the electronic expansion valve, so that indirect heat exchange can be carried out between the system return air and the primary compression exhaust gas. At the same time, the heat exchanger has a certain storage capacity for the primary compression exhaust gas to prevent liquid refrigerant from entering the secondary suction.

[0094] Step S30: Adjust at least one of the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake air temperature difference.

[0095] It can be understood that referring to Figure 1 , the controller of the heat pump system detects the intake air pressure of the high-pressure chamber H through the primary compression pressure sensor P1, converts the pressure detected by the primary compression pressure sensor P1 into the corresponding imported saturation temperature, and at the same time calculates the difference between the temperature of the suction port 4 collected by the primary exhaust temperature sensor T1 and the imported saturation temperature to obtain the intake air temperature difference, and adjusts the opening degrees of the first electronic expansion valve 14 and the second electronic expansion valve 11 according to the intake air temperature difference and the outdoor ambient temperature, so as to improve the heat exchange energy efficiency and reliability of the two-stage compression system.

[0096] It should be noted that referring to Figure 1 , the main components of the heat pump system include a two-stage compressor, a four-way valve 7, a heat exchanger, an indoor heat exchanger 8, multiple electronic expansion valves, an oil separator 6, a subcooling heat exchanger, an outdoor heat exchanger, temperature sensors, pressure sensors, a check valve 17, a regenerator 15, etc. The above multiple electronic expansion valves include a first electronic expansion valve 14, a second electronic expansion valve 11, a third electronic expansion valve 9 and a fourth electronic expansion valve 12.

[0097] It can be understood that during the heating process of the heat pump system, the refrigerant flows as Figure 1As shown by the solid arrows. The refrigerant flows from the compressor exhaust port to the four-way valve 7 and enters the indoor unit for condensation and heat dissipation (heating). After heat dissipation, the refrigerant passes through the third electronic expansion valve 9 (fully open), and then enters the subcooling heat exchanger. A part of the refrigerant is throttled by the second electronic expansion valve 11 and evaporates and absorbs heat in the subcooling heat exchanger to become gaseous and flows to the suction port of the high-pressure chamber H; another part of the refrigerant flows into the regenerator 15 to exchange heat with the return gas to increase the superheat degree of the return gas. The refrigerant after heat exchange is in a subcooled state and is throttled by the fourth electronic expansion valve 12 and enters the outdoor heat exchanger for evaporation and heat absorption, and then enters the heat exchanger again for evaporation and heat absorption (the refrigerant flowing out of the outdoor unit is not completely evaporated into a gaseous state). The refrigerant coming out of the heat exchanger enters the regenerator 15 again to absorb heat. After heat absorption, the refrigerant becomes saturated or supersaturated gaseous and enters the compressor suction port, is compressed by the low-pressure chamber L and then discharged as superheated gas, enters the heat exchanger for condensation, and then enters the high-pressure chamber H for compression and discharge. This cycle repeats.

[0098] It should be understood that with reference to Figure 4 , Figure 4 is the P-h diagram of double-stage gas-cooled compression. The first-stage exhaust compressed by the low-pressure chamber L is cooled by the regenerative heat exchanger, and the inlet temperature of the high-pressure chamber H is close to the saturated state (point d or point e). The function of the regenerative heat exchanger is to reduce the first-stage exhaust temperature and increase the system return gas temperature, thereby reducing the compressor work and improving the system heat exchange energy efficiency, and effectively controlling the exhaust temperature at the compressor exhaust port.

[0099] It can be understood that as shown in Figure 4 , since there is double regenerative heating, the state of the refrigerant when flowing out of the outdoor unit at point a belongs to the gas-liquid two-phase state. Therefore, compared with the traditional heat pump system, the heat exchange efficiency of the outdoor heat exchanger can be effectively improved, and at the same time, it is ensured that there is no risk of liquid return in the compressor. In the corresponding enthalpy-humidity diagram, the temperature at point a is much higher than the temperature at point b. Therefore, when continuously heating and operating, the frosting speed and frequency of the outdoor unit can be effectively reduced.

[0100] Furthermore, in order to accurately control the opening degree of the electronic expansion valve, the above step S30 may include:

[0101] Obtain the current working mode;

[0102] When the working mode is the heating mode, determine whether the outdoor ambient temperature exceeds a first preset temperature;

[0103] If the outdoor ambient temperature exceeds the first preset temperature, set the default opening degree of the first electronic expansion valve to a first default opening degree;

[0104] Determine whether the intake temperature difference exceeds a preset threshold, and adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve based on the difference determination result and the first default opening degree;

[0105] If the outdoor ambient temperature does not exceed the first preset temperature, set the default opening degree of the first electronic expansion valve to the second default opening degree; and

[0106] Judge whether the intake air temperature difference exceeds a preset threshold value, and adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve based on the difference judgment result and the second default opening degree.

[0107] It should be noted that the current working mode can be the working mode of the heat pump system. For example, the current working mode can include a refrigeration working mode and a heating working mode.

[0108] It should be understood that with reference to Figure 5 , Figure 5 is a schematic diagram of the heat recovery control process of the heat pump system. When the controller receives a heating start command, it turns on the heating mode and judges whether the outdoor ambient temperature exceeds the first preset temperature (i.e., a degrees Celsius); if the outdoor ambient temperature exceeds the first preset temperature, set the default opening degree of the first electronic expansion valve 14 to the first default opening degree (i.e., 0 opening degree); judge whether the intake air temperature difference (i.e., T1 - A1) exceeds the preset threshold value (i.e., c); if the intake air temperature difference exceeds the preset threshold value, adjust the opening degree of the first electronic expansion valve 14 based on the first default opening degree, and adjust the opening degree of the second electronic expansion valve 11 to the first target opening degree (i.e., m opening degree); if the intake air temperature difference does not exceed the preset threshold value, judge whether the intake air temperature difference is within a preset range (i.e., c > T1 - A1 > 0); if the intake air temperature difference is within the preset range, control the second electronic expansion valve 11 to maintain the current opening degree; if the intake air temperature difference is not within the preset range, adjust the opening degree of the first expansion valve to the second target opening degree (i.e., F opening degree).

[0109] If the outdoor ambient temperature does not exceed the first preset temperature, set the default opening degree of the first electronic expansion valve 14 to the second default opening degree (i.e., F opening degree); judge whether the intake air temperature difference exceeds the preset threshold value. If the intake air temperature difference exceeds the preset threshold value, adjust the first electronic expansion valve 14 to the third target opening degree (i.e., F - n opening degree) based on the second default opening degree; if the intake air temperature difference does not exceed the preset threshold value, judge whether the intake air temperature difference is within the preset range; if the intake air temperature difference is within the preset range, control the first electronic expansion valve 14 to maintain the current opening degree; if the intake air temperature difference is not within the preset range, adjust the opening degree of the first expansion valve to the fourth target opening degree (i.e., F + n opening degree) based on the second default opening degree.

[0110] Further, in order to accurately adjust the opening degree of the electronic expansion valve in the refrigeration mode to improve the refrigeration efficiency, after obtaining the current working mode, the following steps are further included:

[0111] When the working mode is the refrigeration mode, determine whether the outdoor ambient temperature exceeds a second preset temperature;

[0112] If the outdoor ambient temperature does not exceed the second preset temperature, set the default opening degree of the second electronic expansion valve to a first default opening degree;

[0113] If the outdoor ambient temperature exceeds the second preset temperature, set the default opening degree of the second electronic expansion valve to a second default opening degree, and determine whether the intake air temperature difference exceeds the preset threshold; and

[0114] Based on the difference judgment result and the second default opening degree, adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve.

[0115] It should be noted that referring to Figure 6 and Figure 7 , Figure 6 is the schematic diagram of the refrigeration system of the heat pump system, Figure 7 is the schematic diagram of the refrigeration heat recovery control process. As shown in Figure 6 , the main components of the heat pump system include a two-stage compressor, a four-way valve 7, a heat recovery heat exchanger, an indoor heat exchanger 8, an electronic expansion valve, an oil separator 6, a subcooling heat exchanger, an outdoor heat exchanger, a temperature sensor, a pressure sensor, a check valve 17, etc. The refrigerant flow during the refrigeration process is as shown by the solid line arrow in Figure 6 . During refrigeration, when the outdoor temperature is lower than b °C, the second electronic expansion valve 11 is default in a long-closed state, and the size of the superheat degree c of the first-stage exhaust is adjusted and controlled by the first electronic expansion valve 14.

[0116] It should be understood that as shown in Figure 7 , when the controller receives a cold start instruction, it turns on the refrigeration mode, determines whether the outdoor ambient temperature exceeds the second preset temperature (i.e., b degrees Celsius). If it does not exceed the second preset temperature, set the default opening degree of the second electronic expansion valve 11 to the first default opening degree (i.e., 0 opening degree). If the outdoor ambient temperature exceeds the second preset temperature, set the default opening degree of the second electronic expansion valve 11 to the second default opening degree (i.e., F opening degree), and determine whether the intake air temperature difference exceeds the preset threshold. If the intake air temperature difference exceeds the preset threshold, determine whether the temperature of the suction port 4 of the high-pressure chamber H exceeds t degrees Celsius. If it exceeds t degrees Celsius, adjust the opening degree of the second electronic expansion valve 11 to 2m opening degree, and continue to monitor whether the temperature of the suction port 4 of the high-pressure chamber H exceeds t degrees Celsius. If so, start the frequency reduction protection. If it does not exceed t degrees Celsius, keep the second electronic expansion valve 11 at the current opening degree.

[0117] If the intake air temperature difference does not exceed the preset threshold, it is determined whether the intake air temperature difference is within a preset range (i.e., c>T1 - A1>0). If it is within the preset range, the opening degree of the second electronic expansion valve 11 is adjusted from the F opening degree to the 0 opening degree. If it is not within the preset range, the opening degree of the second electronic expansion valve 11 is adjusted to the 0 opening degree, and the default opening degree of the first electronic expansion valve 14 is adjusted to the m opening degree.

[0118] This embodiment adjusts the opening degree of the electronic expansion valve based on the outdoor ambient temperature and the recent temperature difference between the inlet saturation temperature and the suction port temperature of the high-pressure chamber, thereby effectively throttling the refrigerant and the refrigerant through the electronic expansion valve, reducing the compression ratio during the operation of the heat pump system, cooling the intermediate exhaust of the two-stage compressor, reducing the suction temperature of the high-pressure chamber, improving the heat exchange performance and reliability of the heat pump system, and effectively improving the system energy efficiency.

[0119] In addition, an embodiment of the present invention also proposes a storage medium, on which a heat pump system control program is stored. When the heat pump system control program is executed by a processor, the steps of the heat pump system control method as described above are implemented.

[0120] Since this storage medium adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0121] Refer to Figure 8 , Figure 8 which is the structural block diagram of the first embodiment of the heat pump system control device of the present invention.

[0122] As Figure 8 shown, the heat pump system control device proposed by the embodiment of the present invention includes:

[0123] A data acquisition module 10 for obtaining the inlet saturation temperature and the suction port temperature of the high-pressure chamber, as well as the outdoor ambient temperature;

[0124] A difference calculation module 20 for determining the intake air temperature difference according to the inlet saturation temperature and the suction port temperature; and

[0125] An opening degree adjustment module 30 for adjusting at least one of the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake air temperature difference.

[0126] It should be noted that refer to Figure 1 , Figure 1It is a schematic structural diagram of a heat pump system. The heat pump system includes a two-stage compressor, a heat exchanger, a first electronic expansion valve 14, a second electronic expansion valve 11, and a regenerator 15. The two-stage compressor includes a low-pressure chamber L and a high-pressure chamber H. The heat exchanger is respectively connected to the exhaust port of the low-pressure chamber L, the suction port 4 of the high-pressure chamber H, the regenerator 15, and the first electronic expansion valve 14. The regenerator 15 is respectively connected to the first electronic expansion valve 14, the second electronic expansion valve 11, and the suction port 2 of the low-pressure chamber L.

[0127] It should be noted that the above regenerator 15 can be a regenerative tank, and the above heat exchanger can be a regenerative heat exchanger.

[0128] It should be understood that after calculating the saturation temperature of the suction port 4, the intake air temperature difference is determined by taking the difference, and then the opening degree of the electronic expansion valve is adjusted according to the intake air temperature difference. Thus, the refrigerant flow rate flowing to the heat exchanger can be changed by the change of the opening degree of the electronic expansion valve, so that indirect heat exchange can be carried out between the system suction gas and the first-stage compression exhaust gas. At the same time, the heat exchanger has a certain storage capacity for the first-stage compression exhaust gas to prevent liquid refrigerant from entering the second-stage suction.

[0129] It can be understood that referring to Figure 1 , the controller of the heat pump system detects the intake air pressure of the high-pressure chamber H through the first-stage compression pressure sensor P1, converts the pressure detected by the first-stage compression pressure sensor P1 into the corresponding inlet saturation temperature, and at the same time calculates the difference between the temperature of the suction port 4 collected by the first-stage exhaust temperature sensor T1 and the inlet saturation temperature to obtain the intake air temperature difference. The opening degrees of the first electronic expansion valve 14 and the second electronic expansion valve 11 are adjusted according to the intake air temperature difference and the outdoor ambient temperature, so as to improve the heat exchange energy efficiency and reliability of the two-stage compression system.

[0130] It should be noted that referring to Figure 1 , the main components of the heat pump system include a two-stage compressor, a four-way valve 7, a heat exchanger, an indoor heat exchanger 8, multiple electronic expansion valves, an oil separator 6, a subcooling heat exchanger, an outdoor heat exchanger, temperature sensors, pressure sensors, a check valve 17, a regenerator 15, etc. The above multiple electronic expansion valves include a first electronic expansion valve 14, a second electronic expansion valve 11, a third electronic expansion valve 9, and a fourth electronic expansion valve 12.

[0131] It can be understood that during the heating process of the heat pump system, the refrigerant flows as Figure 1As shown by the solid arrows. The refrigerant flows from the compressor exhaust port to the four-way valve 7 and enters the indoor unit for condensation and heat dissipation (heating). After heat dissipation, the refrigerant passes through the third electronic expansion valve 9 (fully open), and then enters the subcooling heat exchanger. Part of the refrigerant is throttled by the second electronic expansion valve 11, evaporates and absorbs heat in the subcooling heat exchanger and becomes gaseous, flowing towards the suction port of the high-pressure chamber H; another part of the refrigerant flows into the regenerator 15 to exchange heat with the return air to increase the superheat of the return air. The refrigerant after heat exchange is in a subcooled state and is throttled by the fourth electronic expansion valve 12 and enters the outdoor heat exchanger for evaporation and heat absorption, and then enters the heat exchanger again for evaporation and heat absorption (the refrigerant flowing out of the outdoor unit is not completely evaporated into a gaseous state). The refrigerant coming out of the heat exchanger enters the regenerator 15 to absorb heat again. After heat absorption, the refrigerant becomes saturated or supersaturated gaseous, enters the compressor suction port, is compressed by the low-pressure chamber L, and then discharges superheated gaseous, enters the heat exchanger for condensation, and then enters the high-pressure chamber H for compression and discharge. This cycle repeats.

[0132] It should be understood that, with reference to Figure 4 , Figure 4 is the P-h diagram of a two-stage gas-injected cooling compressor. The first-stage exhaust compressed by the low-pressure chamber L is cooled by the regenerative heat exchanger. The inlet temperature of the high-pressure chamber H is close to the saturated state (point d or point e). The function of the regenerative heat exchanger is to reduce the first-stage exhaust temperature and increase the system return air temperature, thereby reducing the compressor work and improving the system heat exchange energy efficiency, and effectively controlling the exhaust temperature at the compressor exhaust port.

[0133] It can be understood that, as shown in Figure 4 , since there is double regenerative heating, the state of the refrigerant when flowing out of the outdoor unit at point a belongs to the gas-liquid two-phase state. Therefore, compared with the traditional heat pump system, the heat exchange efficiency of the outdoor heat exchanger can be effectively improved, and at the same time, it is ensured that there is no risk of liquid return for the compressor. In the corresponding enthalpy-humidity diagram, the temperature at point a is much higher than the temperature at point b. Therefore, during continuous heating operation, the frosting speed and frequency of the outdoor unit can be effectively reduced.

[0134] In this embodiment, the opening degree of the electronic expansion valve is adjusted based on the recent temperature difference between the outdoor ambient temperature and the saturated temperature and suction port temperature at the inlet of the high-pressure chamber, so as to effectively throttle the refrigerant and refrigerant medium through the electronic expansion valve, reduce the compression ratio during the operation of the heat pump system, cool the intermediate exhaust of the two-stage compressor, reduce the high-pressure chamber suction temperature, improve the heat exchange performance and reliability of the heat pump system, and effectively improve the system energy efficiency.

[0135] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0136] It should be noted that the workflow described above is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and no limitation is made here.

[0137] In addition, for the technical details not described in detail in this embodiment, reference can be made to the heat pump system control method provided in any embodiment of the present invention, and details will not be repeated here.

[0138] In addition, it should be noted that in this article, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0139] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0140] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

[0141] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A heat pump system, characterized in that, The heat pump system includes a two-stage compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger, a first electronic expansion valve, and a regenerator. The two-stage compressor includes a low-pressure chamber and a high-pressure chamber. The heat pump system forms a main heat exchange path and a first heat exchange branch. The two-stage compressor, the four-way valve, the outdoor heat exchanger, the regenerator, the indoor heat exchanger, the four-way valve, the first electronic expansion valve, and the regenerator are connected in sequence to form the main heat exchange path. The main heat exchange path includes a heat exchange pipe section connecting the exhaust port of the low-pressure chamber and the suction port of the high-pressure chamber. The heat exchanger is disposed in the first heat exchange branch and the heat exchange pipe section. The first heat exchange branch can exchange heat with the heat exchange pipe section through the heat exchanger. One end of the first heat exchange branch is connected between the four-way valve and the first electronic expansion valve, and the other end of the first heat exchange branch is connected between the first electronic expansion valve and the regenerator.

2. The heat pump system according to claim 1, characterized in that, The heat pump system further includes a subcooling heat exchanger and a second electronic expansion valve. The heat pump system further forms a second heat exchange branch. The subcooling heat exchanger is disposed in the main heat exchange path and the second heat exchange branch between the regenerator and the indoor heat exchanger. One end of the second heat exchange branch is connected to the main heat exchange path between the regenerator and the subcooling heat exchanger. The other end of the second heat exchange branch is connected to the suction port of the high-pressure chamber. The second electronic expansion valve is disposed between the connection node between the second heat exchange branch and the main heat exchange path and the subcooling heat exchanger and is located in the second heat exchange branch.

3. The heat pump system according to claim 2, characterized in that, The heat pump system further includes a check valve. The check valve is disposed in the second heat exchange branch and between the subcooling heat exchanger and the suction port of the high-pressure chamber. The conducting direction of the check valve is from the subcooling heat exchanger to the suction port of the high-pressure chamber.

4. The heat pump system according to claim 2, characterized in that, The heat pump system further includes: a third electronic expansion valve and / or a fourth electronic expansion valve; The third electronic expansion valve is disposed between the indoor heat exchanger and the subcooling heat exchanger and is located in the main heat exchange path; and / or The fourth electronic expansion valve is disposed between the outdoor heat exchanger and the regenerator and is located in the main heat exchange path.

5. A control method for a heat pump system, characterized in that, The heat pump system control method is applied to the heat pump system as claimed in claims 1 to 4. The heat pump system control method includes: Obtaining the inlet saturation temperature and the suction port temperature of the high-pressure chamber, and the outdoor ambient temperature; Determining the intake temperature difference according to the inlet saturation temperature and the suction port temperature; and Adjusting at least one of the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake temperature difference.

6. The control method for a heat pump system according to claim 5, characterized in that, The obtaining the inlet saturation temperature and the suction port temperature of the high-pressure chamber includes: Obtaining the suction port pressure of the high-pressure chamber; and Determining the inlet saturation temperature and the suction port temperature of the high-pressure chamber based on the suction port pressure.

7. The control method for a heat pump system according to claim 5, characterized in that, The adjusting at least one of the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake temperature difference includes: Obtain the current working mode; When the working mode is the heating mode, determine whether the outdoor ambient temperature exceeds a first preset temperature; If the outdoor ambient temperature exceeds the first preset temperature, set the default opening degree of the first electronic expansion valve to a first default opening degree; Determine whether the intake air temperature difference exceeds a preset threshold, and adjust the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference judgment result and the first default opening degree; If the outdoor ambient temperature does not exceed the first preset temperature, set the default opening degree of the first electronic expansion valve to a second default opening degree; and Determine whether the intake air temperature difference exceeds a preset threshold, and adjust the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference judgment result and the second default opening degree.

8. The control method for a heat pump system according to claim 7, characterized in that, The determining whether the intake air temperature difference exceeds a preset threshold, and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference judgment result and the first default opening degree includes: Determine whether the intake air temperature difference exceeds a preset threshold; If the intake air temperature difference exceeds the preset threshold, adjust the opening degree of the first electronic expansion valve based on the first default opening degree, and adjust the opening degree of the second electronic expansion valve to a first target opening degree; If the intake air temperature difference does not exceed the preset threshold, determine whether the intake air temperature difference is within a preset range; If the intake air temperature difference is within the preset range, control the second electronic expansion valve to maintain the current opening degree; and If the intake air temperature difference is not within the preset range, adjust the opening degree of the first expansion valve to a second target opening degree.

9. The control method for a heat pump system according to claim 7, characterized in that, The determining whether the intake air temperature difference exceeds a preset threshold, and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the difference judgment result and the second default opening degree includes: Determine whether the intake air temperature difference exceeds a preset threshold; If the intake air temperature difference exceeds the preset threshold, adjust the first electronic expansion valve to a third target opening degree based on the second default opening degree; If the intake air temperature difference does not exceed the preset threshold, determine whether the intake air temperature difference is within a preset range; If the intake air temperature difference is within the preset range, control the first electronic expansion valve to maintain the current opening degree; and If the intake air temperature difference is not within the preset range, adjust the opening degree of the first expansion valve to a fourth target opening degree based on the second default opening degree.

10. The control method of the heat pump system according to claim 6, wherein, After obtaining the current working mode, it further includes: When the working mode is the cooling mode, determine whether the outdoor ambient temperature exceeds a second preset temperature; If the outdoor ambient temperature does not exceed the second preset temperature, set the default opening degree of the second electronic expansion valve to a first default opening degree; If the outdoor ambient temperature exceeds the second preset temperature, set the default opening degree of the second electronic expansion valve to a second default opening degree, and determine whether the intake air temperature difference exceeds the preset threshold; and Adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve based on the difference judgment result and the second default opening degree.

11. The control method of the heat pump system according to claim 10, wherein, The adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve based on the difference judgment result and the second default opening degree includes: If the intake air temperature difference exceeds the preset threshold, determine whether the suction port temperature of the high-pressure chamber exceeds the third preset temperature, and adjust the opening degree of the second electronic expansion valve based on the temperature judgment result; and If the intake air temperature difference does not exceed the preset threshold, determine whether the intake air temperature difference is within a preset range, and adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve based on the range judgment result and the second default opening degree.

12. A control device of a heat pump system, wherein, The heat pump system control device includes: A data acquisition module for acquiring the inlet saturation temperature and the suction port temperature of the high-pressure chamber, and the outdoor ambient temperature; A difference calculation module for determining the intake air temperature difference according to the inlet saturation temperature and the suction port temperature; and An opening degree adjustment module for adjusting the opening degree of at least one of the first electronic expansion valve and the second electronic expansion valve according to at least one of the outdoor ambient temperature and the intake air temperature difference.

13. A control equipment of a heat pump system, wherein, The heat pump system control equipment includes: a memory, a processor, and a heat pump system control program stored on the memory and executable on the processor, and the heat pump system control program is configured to implement the heat pump system control method according to any one of claims 5 to 11.

14. A storage medium, wherein, A heat pump system control program is stored on the storage medium, and when the heat pump system control program is executed by a processor, it implements the heat pump system control method according to any one of claims 5 to 11.

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