Heat pump system control method and heat pump system

Abstract

The invention discloses a heat pump system control method and a heat pump system.The heat pump system comprises a high-pressure-side heat exchanger and a low-pressure-side heat exchanger, the high-pressure-side heat exchanger prepares hot water through refrigerant heat exchange, and the heat pump system control method comprises the steps that based on a starting-up signal, a valve communicating the high-pressure-side heat exchanger with the low-pressure-side heat exchanger is controlled to be closed; a refrigerant of the heat pump system is accumulated in the high-pressure side heat exchanger, and the refrigerant temperature of the high-pressure side heat exchanger is increased; when it is determined that the refrigerant temperature of the high-pressure side heat exchanger reaches the preset temperature, a valve is controlled to be opened so that the heat pump system can operate; the valve between the high-pressure-side heat exchanger and the low-pressure-side heat exchanger is controlled to be closed within a certain period of time during startup, so that the temperature of a refrigerant in the high-pressure-side heat exchanger is rapidly increased, the water heating efficiency is improved, and the water heating efficiency is improved when refrigeration and water heating of the heat pump system are carried out at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a heat pump system control method and a heat pump system. Background Art

[0002] With economic development and the improvement of people's living standards, there are more and more types of air conditioners to meet different living and production needs. For example, a heat pump system composed of a compressor, a plate heat exchanger, a throttle, an indoor heat exchanger and other devices can be used to cool the room and produce hot water at the same time to improve energy utilization efficiency.

[0003] However, when the existing heat pump system cools the room and produces hot water at the same time, since the refrigerant flows through the two heat exchange parts respectively, the hot water production efficiency is low in a short period of time after the heat pump system is started. Summary of the invention

[0004] The main purpose of the embodiments of the present invention is to provide a heat pump system control method and a heat pump system, aiming to improve the technical problem in the prior art that the heat pump system takes into account room cooling, resulting in low initial efficiency of hot water production.

[0005] An embodiment of the present invention provides a heat pump system control method, wherein the heat pump system includes a high-pressure side heat exchanger and a low-pressure side heat exchanger, wherein the high-pressure side heat exchanger prepares hot water by heat exchange with a refrigerant, and the heat pump system control method includes:

[0006] Based on the startup signal, the valve connecting the high-pressure side heat exchanger and the low-pressure side heat exchanger is controlled to be closed, so that the refrigerant of the heat pump system is accumulated in the high-pressure side heat exchanger, thereby increasing the refrigerant temperature of the high-pressure side heat exchanger;

[0007] When it is determined that the refrigerant temperature of the high-pressure side heat exchanger reaches a preset temperature, the valve is controlled to open so that the heat pump system operates.

[0008] In some embodiments of the present invention, the heat pump system control method further includes:

[0009] According to the refrigerant pressure of the high-pressure side heat exchanger, the refrigerant temperature of the high-pressure side heat exchanger is determined. In some embodiments of the present invention, the heat pump system further includes a compressor, the exhaust port of the compressor is connected to the high-pressure side heat exchanger, and the return port of the compressor is connected to the low-pressure side heat exchanger, and the heat pump system control method further includes:

[0010] Determining whether the pressure of the air return port is continuously less than or equal to a first preset pressure within a first preset time;

[0011] When it is determined that the pressure of the air return port is continuously less than or equal to the first preset pressure within the first preset time, the valve is controlled to open.

[0012] In some embodiments of the present invention, the heat pump system further includes a compressor, an exhaust port of the compressor is connected to the high-pressure side heat exchanger, and an air return port of the compressor is connected to the low-pressure side heat exchanger, and the heat pump system control method further includes:

[0013] When it is determined that the running time of the compressor is greater than or equal to the second preset time, the valve is controlled to open.

[0014] In some embodiments of the present invention, the low-pressure side heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger.

[0015] In some embodiments of the present invention, a heat pump system is also provided, which includes a compressor, a high-pressure side heat exchanger, a throttling device, a low-pressure side heat exchanger, a valve and a control module, the exhaust port of the compressor is connected to the high-pressure side heat exchanger, the high-pressure side heat exchanger is connected to the throttling device, the throttling device is connected to the low-pressure side heat exchanger, the low-pressure side heat exchanger is connected to the return air port of the compressor, and the valve is arranged between the high-pressure side heat exchanger and the low-pressure side heat exchanger; the control module controls the valve connecting the high-pressure side heat exchanger and the low-pressure side heat exchanger to be closed based on a power-on signal, so that the refrigerant of the heat pump system accumulates in the high-pressure side heat exchanger to increase the refrigerant temperature of the high-pressure side heat exchanger; the control module is also used to control the valve to open when it is determined that the refrigerant temperature of the high-pressure side heat exchanger reaches a preset temperature, so that the heat pump system can operate.

[0016] In some embodiments of the present invention, the heat pump system also includes a first pressure sensor, which is arranged in the high-pressure side heat exchanger and is used to obtain the refrigerant pressure in the high-pressure side heat exchanger; the control module is also used to determine the refrigerant temperature of the high-pressure side heat exchanger based on the refrigerant pressure in the high-pressure side heat exchanger.

[0017] In some embodiments of the present invention, the heat pump system also includes a second pressure sensor, which is arranged at the return air port and is used to obtain the pressure of the return air port; the control module is used to determine whether the pressure of the return air port is continuously less than or equal to the first preset pressure within a first preset time, and when it is determined that the pressure of the return air port is continuously less than or equal to the first preset pressure within the first preset time, control the valve to open.

[0018] In some embodiments of the present invention, the heat pump system further includes an acquisition module, which is used to acquire the operating time of the compressor. The control module is further used to control the valve to open when it is determined that the operating time of the compressor is greater than or equal to a second preset time.

[0019] In some embodiments of the present invention, the low-pressure side heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger, and the indoor heat exchanger and the outdoor heat exchanger are connected in parallel between the compressor return air port and the throttling device.

[0020] The embodiment of the present invention provides a heat pump system control method and a heat pump system. After the heat pump system is turned on, the heat pump system control method controls the valve connecting the high-pressure side heat exchanger and the low-pressure side heat exchanger to be closed, so that the refrigerant in the heat pump system accumulates in the high-pressure side heat exchanger, and the temperature of the high-pressure side heat exchanger is quickly increased, so that the high-pressure side heat exchanger has a higher water-heating efficiency in a short time; and when the temperature of the refrigerant in the high-pressure side heat exchanger reaches a preset temperature, the valve is controlled to open, so that the heat pump system can cool and heat water at the same time. That is, the present invention controls the valve between the high-pressure side heat exchanger and the low-pressure side heat exchanger to be closed within a certain period of time when the heat pump system is turned on, so that the refrigerant in the high-pressure side heat exchanger is quickly heated up, and the water-heating efficiency is improved, so as to improve the water-heating efficiency when the heat pump system cools and heats water at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the steps of a heat pump system control method according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the steps of a heat pump system control method according to another embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a heat pump system according to a first embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a heat pump system according to a second embodiment of the present invention;

[0026] Figure 5 It is a schematic structural diagram of a heat pump system according to a third embodiment of the present invention.

[0027] Figure numerals: 10, control module; 20, first pressure sensor; 30, second pressure sensor; 40, acquisition module; 100, compressor; 200, high-pressure side heat exchanger; 300, throttling device; 400, low-pressure side heat exchanger; 401, indoor heat exchanger; 402, outdoor heat exchanger; 500, valve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] like Figure 1-Figure 5 As shown, the present invention provides a heat pump system control method, which is applied to a heat pump rare earth. The heat pump system includes a high-pressure side heat exchanger 200 and a low-pressure side heat exchanger 400. The high-pressure side heat exchanger 200 prepares hot water by heat exchange with a refrigerant. The heat pump system control method includes:

[0033] S100, based on the power-on signal, controls the valve 500 connecting the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 to be closed, so that the refrigerant of the heat pump system accumulates in the high-pressure side heat exchanger 200, thereby increasing the refrigerant temperature of the high-pressure side heat exchanger 200.

[0034] Among them, the start-up signal is the start-up signal of the heat pump system, that is, at the moment of starting the heat pump system, the valve 500 connecting the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 is controlled to be closed, so that the refrigerant coming out of the compressor 100 cannot flow to the low-pressure side heat exchanger 400, and accumulates in the high-pressure side heat exchanger 200, thereby increasing the refrigerant pressure in the high-pressure side heat exchanger 200. As the refrigerant pressure increases, the refrigerant temperature in the high-pressure side heat exchanger 200 also rises accordingly, that is, the refrigerant in the high-pressure side heat exchanger 200 has a higher temperature in a short time, so that it can improve the heat exchange effect between the refrigerant and water, and improve the hot water making efficiency of the high-pressure side heat exchanger 200.

[0035] Generally, according to the flow direction of the refrigerant, the heat exchanger located before the throttling device 300 is called the high-pressure side heat exchanger 200, and the heat exchanger located after the throttling device 300 is called the low-pressure side heat exchanger 400.

[0036] S300, when it is determined that the refrigerant temperature of the high-pressure side heat exchanger 200 reaches a preset temperature, the valve 500 is controlled to open to operate the heat pump system.

[0037] Among them, the preset temperature is the temperature data pre-stored in the controller of the heat pump system. When it is determined that the refrigerant temperature in the high-pressure side heat exchanger 200 reaches the preset temperature, the control valve 500 is opened to allow the refrigerant accumulated in the high-pressure side heat exchanger 200 to flow to the low-pressure side heat exchanger 400, and then to be heat exchanged by the low-pressure side heat exchanger 400 for room cooling. Finally, the refrigerant flows to the compressor 100 after heat exchange by the low-pressure side heat exchanger 400 and starts to circulate in the heat pump system, thereby realizing simultaneous room cooling and hot water production of the heat pump system.

[0038] When the refrigerant temperature on the high-pressure side reaches a preset temperature, the refrigerant temperature in the high-pressure side heat exchanger 200 is high enough to efficiently exchange heat with water to prepare water.

[0039] It can be understood that after the heat pump system is turned on, the heat pump system control method controls the valve 500 connecting the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 to be closed, so that the refrigerant in the heat pump system accumulates in the high-pressure side heat exchanger 200, and the temperature of the high-pressure side heat exchanger 200 is quickly increased, so that the high-pressure side heat exchanger 200 has a higher water-making efficiency in a short time; and when the refrigerant temperature of the high-pressure side heat exchanger 200 reaches a preset temperature, the valve 500 is controlled to open, so that the heat pump system can cool and heat water at the same time. That is, the present invention controls the valve 500 between the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 to be closed within a certain period of time when the heat pump system is turned on, so that the refrigerant in the high-pressure side heat exchanger 200 is quickly heated up, and the water-making efficiency is improved, so as to improve the water-making efficiency when the heat pump system cools and heats water at the same time.

[0040] In some embodiments, the heat pump system control method further includes:

[0041] S200 , determining the refrigerant temperature of the high-pressure side heat exchanger 200 according to the refrigerant pressure of the high-pressure side heat exchanger 200 .

[0042] After the refrigerant pressure in the high-pressure side heat exchanger 200 is determined, the refrigerant temperature corresponding to the current refrigerant pressure may be determined according to a conversion formula or a corresponding relationship table pre-stored in the controller of the heat pump system.

[0043] Specifically, for example, a conversion formula between refrigerant pressure and refrigerant temperature is pre-stored in the controller of the heat pump system. The refrigerant pressure obtained by the pressure sensor installed in the high-pressure side heat exchanger 200 can be substituted into the conversion formula to determine the refrigerant temperature.

[0044] Alternatively, a correspondence table between refrigerant pressure and refrigerant temperature is pre-stored in the controller of the heat pump system, and each refrigerant pressure corresponds to a refrigerant temperature. Then, the corresponding refrigerant temperature can be determined according to the determined refrigerant pressure.

[0045] In some embodiments, the heat pump system further includes a compressor 100, the exhaust port of the compressor 100 is connected to the high-pressure side heat exchanger 200, and the return air port of the compressor 100 is connected to the low-pressure side heat exchanger 400. The heat pump system control method further includes:

[0046] S210, determining whether the pressure of the air return port is continuously less than or equal to a first preset pressure within a first preset time.

[0047] S220, when it is determined that the pressure of the return air port is continuously less than or equal to the first preset pressure within the first preset time, the control valve 500 is opened.

[0048] Among them, the pressure at the return air port can represent the pressure inside the compressor 100. If the pressure inside the compressor 100 continues to be too small for a certain period of time, it means that the amount of refrigerant in the compressor 100 is too small. If this continues for a long time, the compressor 100 is prone to idling, which will wear the compressor 100 and even cause damage to the compressor 100. Therefore, when it is detected that the pressure at the return air port is continuously less than or equal to the first preset pressure within the first preset time, the control valve 500 is opened to allow the refrigerant in the high-pressure side heat exchanger 200 to begin to flow to the compressor 100, so as to ensure that there is enough refrigerant in the compressor 100 and avoid the compressor 100 from idling.

[0049] The first preset time is time data pre-stored in the heat pump system controller.

[0050] The first preset pressure is pressure data pre-stored in the heat pump system controller.

[0051] In other embodiments, the heat pump system further includes a compressor 100, an exhaust port of the compressor 100 is connected to the high-pressure side heat exchanger 200, and an air return port of the compressor 100 is connected to the low-pressure side heat exchanger 400, and the heat pump system control method further includes:

[0052] S210, when it is determined that the running time of the compressor 100 is greater than or equal to the second preset time, the valve 500 is controlled to open.

[0053] Among them, the running time of the compressor 100 is the total time from the start of the compressor 100 to the current acquisition of the compressor 100 time. When the valve 500 between the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 is closed, the running time of the compressor 100 is too long, which will cause too little refrigerant in the compressor 100, thereby causing the compressor 100 to idle. Therefore, when the running time of the compressor 100 is greater than or equal to the second preset time, the control valve 500 is opened, so that the refrigerant in the high-pressure side heat exchanger 200 flows to the compressor 100 through the low-pressure side heat exchanger 400.

[0054] The second preset time is time data pre-stored in the controller of the heat pump system.

[0055] In some embodiments, the heat pump system used in the heat pump system control method has a low-pressure side heat exchanger 400 including an outdoor heat exchanger 402 and an indoor heat exchanger 401 .

[0056] In some embodiments, a heat pump system is further provided, the heat pump system comprising a compressor 100, a high-pressure side heat exchanger 200, a throttling device 300, a low-pressure side heat exchanger 400, a valve 500 and a control module 10, the exhaust port of the compressor 100 is connected to the high-pressure side heat exchanger 200, the high-pressure side heat exchanger 200 is connected to the throttling device 300, the throttling device 300 is connected to the low-pressure side heat exchanger 400, the low-pressure side heat exchanger 400 is connected to the return air port of the compressor 100, and the valve 500 is connected to the control module 10. 00 is arranged between the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400; the control module 10 controls the valve 500 connecting the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 to be closed based on the power-on signal, so that the refrigerant of the heat pump system accumulates in the high-pressure side heat exchanger 200, thereby increasing the refrigerant temperature of the high-pressure side heat exchanger 200; the control module 10 is also used to control the valve 500 to open when it is determined that the refrigerant temperature of the high-pressure side heat exchanger 200 reaches a preset temperature, so as to enable the heat pump system to operate.

[0057] The throttling device 300 is generally an expansion valve.

[0058] The valve 500 is generally a solenoid valve, which receives a control signal from the control module 10 and switches between closing and opening.

[0059] That is, after detecting the power-on signal, the control module 10 sends a closing signal to the valve 500. After receiving the closing signal sent by the control module 10, the valve 500 closes, so that the pipeline connecting the high-pressure side heat exchanger 200 and the low-pressure side heat exchanger 400 is blocked, so that after the heat pump system is started, the refrigerant accumulates in the high-pressure side heat exchanger 200, so as to increase the refrigerant temperature in the high-pressure side heat exchanger 200 in a short time, so as to facilitate increasing the temperature of preparing hot water in a short time; when the control module 10 determines that the refrigerant temperature of the high-pressure side heat exchanger 200 reaches the preset temperature, the control module 10 sends an opening signal to the valve 500. After the valve 500 receives the opening signal, the valve 500 opens, so that the refrigerant accumulated in the high-pressure side heat exchanger 200 can flow to the low-pressure side heat exchanger 400.

[0060] In some embodiments, the heat pump system also includes a first pressure sensor 20, which is arranged in the high-pressure side heat exchanger 200 and is used to obtain the refrigerant pressure in the high-pressure side heat exchanger 200; the control module 10 is also used to determine the refrigerant temperature of the high-pressure side heat exchanger 200 according to the refrigerant pressure in the high-pressure side heat exchanger 200.

[0061] Among them, the first pressure sensor 20 is electrically connected to the control module 10, and the first pressure sensor 20 is used to feed back the detected refrigerant pressure in the high-pressure side heat exchanger 200 to the control module 10. The control module 10 determines the refrigerant temperature corresponding to the refrigerant pressure based on the refrigerant pressure information fed back by the first pressure sensor 20 and the conversion formula or corresponding table pre-stored in the control module 10.

[0062] In some embodiments, the heat pump system also includes a second pressure sensor 30, which is arranged at the return air port and is used to obtain the pressure of the return air port; the control module 10 is used to determine whether the pressure of the return air port is continuously less than or equal to the first preset pressure within a first preset time, and when it is determined that the pressure of the return air port is continuously less than or equal to the first preset pressure within the first preset time, the control valve 500 is opened.

[0063] Among them, the second pressure sensor 30 is electrically connected to the control module 10, and the second pressure sensor 30 is used to feed back the pressure of the return air port of the compressor 100 to the control module 10. After receiving the pressure information fed back by the second pressure sensor 30, the control module 10 is used to determine the pressure change of the return air port. When the control module 10 determines that the pressure of the return air port is continuously less than the first preset pressure within the first preset time, the control module 10 sends an opening signal to the valve 500. After receiving the opening signal, the valve 500 switches to the open state, so that the refrigerant can flow from the high-pressure side heat exchanger 200 to the low-pressure side heat exchanger 400.

[0064] In some embodiments, the heat pump system further includes an acquisition module 40 for acquiring the operating time of the compressor 100 , and the control module 10 is further used to control the valve 500 to open when it is determined that the operating time of the compressor 100 is greater than or equal to a second preset time.

[0065] Among them, the control module 10 is electrically connected to the acquisition module 40. The acquisition module 40 starts timing after the compressor 100 is started, and after receiving the acquisition signal sent by the control module 10, the total duration of the compressor 100 from the start to the current moment is fed back to the control module 10 as time information. The control module 10 determines whether the running time of the compressor 100 is greater than or equal to the second preset time based on the time information fed back by the acquisition module 40, and sends an opening signal to the valve 500 when the running time of the compressor 100 is greater than or equal to the second preset time. After receiving the opening signal, the valve 500 switches to the open state, so that the refrigerant in the high-pressure side heat exchanger 200 can flow to the low-pressure side heat exchanger 400.

[0066] In some embodiments, the low-pressure side heat exchanger 400 includes an indoor heat exchanger 401 and an outdoor heat exchanger 402 , and the indoor heat exchanger 401 and the outdoor heat exchanger 402 are connected in parallel between the return air port of the compressor 100 and the throttling device 300 .

[0067] In some embodiments, the low-pressure side heat exchanger 400 includes multiple indoor heat exchangers 401 and multiple outdoor heat exchangers 402 , and the multiple indoor heat exchangers 401 and multiple outdoor heat exchangers 402 are connected in parallel between the return air port of the compressor 100 and the throttling device 300 .

[0068] In some embodiments, the valve 500 may be disposed between the high-pressure side heat exchanger 200 and the throttling device 300 , or may be disposed between the low-pressure side heat exchanger 400 and the throttling device 300 .

[0069] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, within the application concept of the present invention are included in the patent protection scope of the present invention.

Claims

1. A heat pump system control method, the heat pump system includes a high-pressure side heat exchanger and a low-pressure side heat exchanger, the high-pressure side heat exchanger prepares hot water by heat exchange with a refrigerant, characterized in that: The heat pump system control method comprises: Based on the startup signal, the valve connecting the high-pressure side heat exchanger and the low-pressure side heat exchanger is controlled to be closed, so that the refrigerant of the heat pump system is accumulated in the high-pressure side heat exchanger, thereby increasing the refrigerant temperature of the high-pressure side heat exchanger; When it is determined that the refrigerant temperature of the high-pressure side heat exchanger reaches a preset temperature, the valve is controlled to open so that the heat pump system operates.

2. The heat pump system control method according to claim 1, characterized in that: The heat pump system control method further includes: The refrigerant temperature of the high-pressure side heat exchanger is determined according to the refrigerant pressure of the high-pressure side heat exchanger.

3. The heat pump system control method according to claim 2, characterized in that: The heat pump system further includes a compressor, an exhaust port of the compressor is connected to the high-pressure side heat exchanger, and an air return port of the compressor is connected to the low-pressure side heat exchanger. The heat pump system control method further includes: Determining whether the pressure of the air return port is continuously less than or equal to a first preset pressure within a first preset time; When it is determined that the pressure of the air return port is continuously less than or equal to the first preset pressure within the first preset time, the valve is controlled to open.

4. The heat pump system control method according to claim 1, characterized in that: The heat pump system further includes a compressor, an exhaust port of the compressor is connected to the high-pressure side heat exchanger, and an air return port of the compressor is connected to the low-pressure side heat exchanger. The heat pump system control method further includes: When it is determined that the running time of the compressor is greater than or equal to the second preset time, the valve is controlled to open.

5. The heat pump system control method according to claim 1, characterized in that: The low-pressure side heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger.

6. A heat pump system, characterized in that: The heat pump system includes a compressor, a high-pressure side heat exchanger, a throttling device, a low-pressure side heat exchanger, a valve and a control module. The exhaust port of the compressor is connected to the high-pressure side heat exchanger, the high-pressure side heat exchanger is connected to the throttling device, the throttling device is connected to the low-pressure side heat exchanger, and the low-pressure side heat exchanger is connected to the return air port of the compressor. The valve is arranged between the high-pressure side heat exchanger and the low-pressure side heat exchanger. Based on a power-on signal, the control module controls the valve connecting the high-pressure side heat exchanger and the low-pressure side heat exchanger to be closed so that the refrigerant of the heat pump system accumulates in the high-pressure side heat exchanger to increase the refrigerant temperature of the high-pressure side heat exchanger. The control module is also used to control the valve to open when it is determined that the refrigerant temperature of the high-pressure side heat exchanger reaches a preset temperature, so that the heat pump system can operate.

7. The heat pump system according to claim 6, characterized in that: The heat pump system also includes a first pressure sensor, which is arranged in the high-pressure side heat exchanger and is used to obtain the refrigerant pressure in the high-pressure side heat exchanger; the control module is also used to determine the refrigerant temperature of the high-pressure side heat exchanger according to the refrigerant pressure in the high-pressure side heat exchanger.

8. The heat pump system according to claim 7, characterized in that: The heat pump system also includes a second pressure sensor, which is arranged at the return air port and is used to obtain the pressure of the return air port; the control module is used to determine whether the pressure of the return air port is continuously less than or equal to the first preset pressure within a first preset time, and when it is determined that the pressure of the return air port is continuously less than or equal to the first preset pressure within the first preset time, control the valve to open.

9. The heat pump system according to claim 6, characterized in that: The heat pump system further includes an acquisition module, which is used to acquire the running time of the compressor. The control module is further used to control the valve to open when it is determined that the running time of the compressor is greater than or equal to a second preset time.

10. The heat pump system according to claim 6, characterized in that: The low-pressure side heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger, and the indoor heat exchanger and the outdoor heat exchanger are connected in parallel between the compressor return air port and the throttling device.

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