Detection method of heat pump system and heat pump system

Abstract

The invention relates to the technical field of heat pumps, particularly provides a detection method of a heat pump system and the heat pump system, and aims to solve the problem that whether a four-way valve is normal or not cannot be accurately judged in the prior art. In order to achieve the purpose, the detection method comprises the steps that a four-way valve is controlled to execute a first action, so that an exhaust port of a compressor communicates with a first heat exchanger; the first throttling valve is controlled to be closed; controlling the filling device to fill the detection gas; acquiring a first pressure value measured by a first pressure detection device; acquiring a second pressure value measured by a second pressure detection device; the four-way valve is controlled to execute a second action, so that an air suction port of the compressor communicates with the first heat exchanger; and judging whether the four-way valve is normal or not based on the first pressure value and the second pressure value. According to the detection method, the detection gas is injected into the heat pump system, the air pressure value in the refrigerant loop is obtained while the four-way valve is controlled to act, and whether the four-way valve is normal or not is judged according to the air pressure value.

Description

Technical Field

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

[0002] Control elements in a heat pump system, such as a four-way valve, etc., are usually sampled and inspected during incoming inspection. The sampling inspection can only determine the quality of some four-way valves. For a four-way valve installed in a heat pump system to be able to operate properly, it is necessary to ensure not only that the quality of the four-way valve itself is okay, but also that the four-way valve is correctly installed. Whether the four-way valve installed in the heat pump system is normal cannot be accurately judged by existing detection means.

[0003] Correspondingly, there is a need in the art for a new detection method for a heat pump system and a heat pump system to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, to solve the problem that it is impossible to accurately judge whether a four-way valve installed in a heat pump system is normal in the prior art.

[0005] The present invention provides a detection method for a heat pump system. The heat pump system includes a refrigerant circuit, on which a compressor, a first heat exchanger, a first throttle valve, and a second heat exchanger are sequentially provided; the heat pump system further includes: a four-way valve for switching the refrigerant flow direction in the refrigerant circuit; a first pressure detection device provided on one side of the exhaust port of the compressor; a second pressure detection device provided on one side of the suction port of the compressor; a charging device capable of charging a detection gas into the first heat exchanger; the detection method includes: controlling the four-way valve to perform a first action so that the exhaust port of the compressor is communicated with the first heat exchanger; controlling the first throttle valve to close; controlling the charging device to charge the detection gas; obtaining a first pressure value measured by the first pressure detection device; obtaining a second pressure value measured by the second pressure detection device; controlling the four-way valve to perform a second action so that the suction port of the compressor is communicated with the first heat exchanger; and judging whether the four-way valve is normal based on the first pressure value and the second pressure value.

[0006] In the case of adopting the above technical solution, the charging device is controlled to charge the detection gas into the first heat exchanger. Since the first throttle valve is closed and the four-way valve performs the first action to connect the exhaust port with the first heat exchanger, the detection gas moves from the first heat exchanger to the exhaust port and passes through the first pressure detection device. Also, because the suction port and the exhaust port of the compressor are not connected when the compressor is in a stationary state, the air pressure in the current path of the refrigerant circuit continuously increases as the detection gas is charged, and the first pressure value measured by the first pressure detection device should also increase accordingly. At this time, since there is no increase or decrease in the detection gas at the second pressure detection device, the second pressure value measured should remain unchanged. When the four-way valve performs the second action to connect the suction port with the first heat exchanger, the detection gas charged by the charging device moves from the first heat exchanger to the suction port and passes through the second pressure detection device. At this time, the air pressure in the current path of the refrigerant circuit also continuously increases as the detection gas is charged, and the second pressure value measured by the second pressure detection device should also increase accordingly. At this time, the detection gas at the first pressure detection device flows into the second heat exchanger through the four-way valve, and since there is no increase in the detection gas, the first pressure value measured should decrease. Therefore, based on the first pressure value and the second pressure value, it can be determined whether the four-way valve is normal, achieving the purpose of accurately determining whether the four-way valve installed in the heat pump system is normal.

[0007] In the specific implementation of the above detection method for the heat pump system, the step of "judging whether the four-way valve is normal based on the first pressure value and the second pressure value" further includes: if the first pressure value continuously increases when the four-way valve performs the first action and decreases when the four-way valve performs the second action, and the second pressure value remains unchanged when the four-way valve performs the first action and continuously increases when the four-way valve performs the second action, it is determined that the four-way valve is normal.

[0008] In the case of adopting the above technical solution, if the first pressure value and the second pressure value conform to the theoretical change results, it indicates that the four-way valve is correctly installed and the commutation function is normal.

[0009] In the specific implementation of the above detection method for the heat pump system, the heat pump system further includes: a high-pressure switch, which is arranged between the exhaust port and the first pressure detection device; after the step of "acquiring the first pressure value measured by the first pressure detection device", the detection method further includes: when the first pressure value is greater than or equal to the first set value, if a disconnection signal sent by the high-pressure switch is received, it is determined that the high-pressure switch is normal.

[0010] In the case of adopting the above technical solution, as the air pressure in the refrigerant circuit continuously increases, when the first pressure value is greater than or equal to the first set value, the high-pressure switch disconnects and sends a disconnection signal. After the controller receives the disconnection signal, it indicates that the high-pressure switch is normal.

[0011] In the specific implementation of the above-mentioned detection method for the heat pump system, the compressor further includes a gas injection port; the heat pump system further includes: a refrigerant branch, the first end of the refrigerant branch is connected to the gas injection port, and the second end is connected to the refrigerant return line between the first heat exchanger and the first throttle valve; an economizer, the economizer is arranged on the refrigerant return line between the refrigerant branch and the first heat exchanger, and is also arranged on the refrigerant branch; a second throttle valve, the second throttle valve is arranged on the refrigerant branch between the second end of the refrigerant branch and the economizer; before, at the same time as, or after the step of "controlling the first throttle valve to close", the detection method further includes: controlling the second throttle valve to close.

[0012] In the case of adopting the above technical solution, for a heat pump system provided with an economizer, when controlling the first throttle valve to close, it is also necessary to control the second throttle valve to close to realize the detection of whether the four-way valve and the high-pressure switch are normal.

[0013] In the specific implementation of the above-mentioned detection method for the heat pump system, before, at the same time as, or after the step of "judging whether the four-way valve is normal", the detection method further includes: controlling the charging device to close; controlling the second throttle valve to open to a first opening degree; obtaining the first decreasing speed of the second pressure value; controlling the second throttle valve to open to a second opening degree; obtaining the second decreasing speed of the second pressure value; based on the first decreasing speed and the second decreasing speed, judging whether the second throttle valve is normal; wherein, the second opening degree is greater than the first opening degree.

[0014] In the case of adopting the above technical solution, after the charging device is closed, the air pressure in the refrigerant circuit no longer increases. When controlling the second throttle valve to open to the first opening degree, the detected air flow in the refrigerant circuit passes through the economizer and then moves to the refrigerant branch through the second throttle valve. At this time, the second pressure value decreases, and the decreasing speed is slow. When controlling the second throttle valve to open to a larger second opening degree, the moving speed of the refrigerant circuit to the refrigerant branch increases. By comparing the magnitudes of the first decreasing speed and the second decreasing speed, it can be judged whether the second throttle valve is normal.

[0015] In the specific implementation of the above-mentioned detection method for the heat pump system, the step of "based on the first decreasing speed and the second decreasing speed, judging whether the second throttle valve is normal" further includes: if the second decreasing speed is greater than the first decreasing speed, and the first decreasing speed is greater than zero, then it is determined that the second throttle valve is normal.

[0016] In the case of adopting the above technical solution, both the first decreasing speed and the second decreasing speed being greater than zero indicates that the opening and closing function of the second throttle valve is normal, and the second decreasing speed being greater than the first decreasing speed indicates that the function of the second throttle valve at different opening degrees is normal.

[0017] In the specific implementation of the above-mentioned detection method for the heat pump system, simultaneously with or after the step of "judging whether the second throttle valve is normal based on the first reduction speed and the second reduction speed", the detection method further includes: controlling the second throttle valve to close; controlling the first throttle valve to open; and judging whether the first throttle valve is normal based on the first pressure value and the second pressure value.

[0018] In the case of adopting the above technical solution, after controlling the second throttle valve to close and the first throttle valve to open, the detection gas in the condensation circuit communicated with the suction port of the compressor moves through the first throttle valve towards the second heat exchanger, and finally communicates with the exhaust port of the compressor through the four-way valve. The air pressure value at the first pressure detection device decreases. Since the condensation circuits where the first pressure detection device and the second pressure detection device are located are communicated, the air pressure values are finally the same.

[0019] In the specific implementation of the above-mentioned detection method for the heat pump system, the step of "judging whether the first throttle valve is normal based on the first pressure value and the second pressure value" further includes: if the first pressure value decreases and the first pressure value and the second pressure value are finally the same, it is determined that the first throttle valve is normal.

[0020] In the case of adopting the above technical solution, if the first pressure value and the second pressure value conform to the theoretical change results, it indicates that the first throttle valve is normal.

[0021] In the specific implementation of the above-mentioned detection method for the heat pump system, the heat pump system further includes: a low-pressure switch, which is arranged between the suction port and the second pressure detection device; simultaneously with or after the step of "judging whether the first throttle valve is normal based on the first pressure value and the second pressure value", the detection method further includes: controlling the charging device to recover the detection gas; when the second pressure value is less than or equal to the second set pressure value, if a disconnection signal sent by the low-pressure switch is received, it is determined that the low-pressure switch is normal.

[0022] In the case of adopting the above technical solution, the charging device recovers the detection gas, the pressure at the second pressure detection device decreases. When it is less than or equal to the second set pressure value, the low-pressure switch disconnects and sends a disconnection signal. After the controller receives the disconnection signal, it indicates that the low-pressure switch is normal.

[0023] In a second aspect, the present invention further provides a heat pump system, which includes a processor; a memory, and the memory is adapted to store multiple program codes, and the program codes are adapted to be loaded and run by the processor to execute the detection method for the heat pump system.

[0024] Compared with the prior art, the heat pump system detection method provided by the present invention has the following beneficial effects: by filling the heat pump system with detection gas, and obtaining the air pressure value in the refrigerant circuit while controlling the action of the four-way valve, judging whether the four-way valve is normal according to the air pressure value. The heat pump system provided by the present invention is used to perform the detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a schematic diagram of the overall structure of the heat pump system of the present invention;

[0027] Figure 2 It is the main step flow of the detection method of the heat pump system of the present invention;

[0028] Figure 3 It is a detailed step flow of an implementation method of the heat pump system of the present invention.

[0029] List of reference numerals:

[0030] 1-refrigerant circuit, 2-compressor, 3-first heat exchanger, 4-first throttle valve, 5-second heat exchanger, 6-four-way valve, 7-first pressure detection device, 8-second pressure detection device, 9-high pressure switch, 10-low pressure switch, 11-refrigerant branch, 12-economizer, 13-second throttle valve, 14-charging device, 21-intake port, 22-exhaust port, 23-air supply port. DETAILED DESCRIPTION

[0031] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0032] It should be noted that in the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The ordinal numbers "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0033] In addition, it should be noted that in the description of the present invention, although the steps of the detection method of the present invention are described in a specific order in this application, these orders are not restrictive. Without departing from the basic principle of the present invention, those skilled in the art can execute the steps in different orders.

[0034] Furthermore, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Based on the problem pointed out in the background art that the four-way valve installed in the heat pump system in the prior art cannot accurately determine whether it is normal, the present invention provides a detection method and a heat pump system for a heat pump system, aiming to judge whether the four-way valve is normal by filling a detection gas into the heat pump system and obtaining the air pressure value in the refrigerant circuit while controlling the action of the four-way valve.

[0036] First, refer to Figure 1, this figure shows the overall structure of the heat pump system of the present invention. The heat pump system of the present invention includes a refrigerant circuit 1, on which a compressor 2, a first heat exchanger 3, a first throttle valve 4, and a second heat exchanger 5 are sequentially arranged; the compressor 2 is provided with a suction port 21, a discharge port 22, and a gas replenishing port 23; the first heat exchanger 3 is provided with a first interface and a second interface, the second heat exchanger 5 is provided with a third interface and a fourth interface, the second interface and the fourth interface are indirectly connected through the refrigerant circuit 1, and the first throttle valve 4 is arranged on the refrigerant circuit 1 between the second interface and the fourth interface. The heat pump system further includes a four-way valve 6, and the first interface, the suction port 21, the discharge port 22, and the third interface are connected through the four-way valve 6. The four-way valve 6 is used to switch the refrigerant flow direction in the refrigerant circuit 1; the four-way valve 6 is provided with a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is connected to the discharge port 22 of the compressor 2, the second valve port is connected to the third interface, the third valve port is connected to the suction port 21 of the compressor 2, and the fourth valve port is connected to the first interface. When the four-way valve 6 performs a first action, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port, so that the first interface of the first heat exchanger 3 is connected to the discharge port 22 of the compressor 2, and the third interface of the second heat exchanger 5 is communicated with the suction port 21; when the four-way valve 6 performs a second action, the first valve port is communicated with the second valve port, and the third valve port is communicated with the fourth valve port, so that the first interface of the first heat exchanger 3 is connected to the suction port 21 of the compressor 2, and the third interface of the second heat exchanger 5 is connected to the discharge port 22 of the compressor 2.

[0037] The heat pump system further includes a first pressure detection device 7, a second pressure detection device 8, a high-pressure switch 9, and a low-pressure switch 10. The first pressure detection device 7 is arranged on the refrigerant circuit 1 between the first valve port and the discharge port 22 of the compressor 2, the second pressure detection device 8 is arranged on the refrigerant circuit 1 between the third valve port and the suction port 21 of the compressor 2, the high-pressure switch 9 is arranged on the refrigerant circuit 1 between the discharge port 22 and the first pressure detection device 7, and the low-pressure switch 10 is arranged on the refrigerant circuit 1 between the suction port 21 and the second pressure detection device 8.

[0038] It should be noted that the first pressure detection device 7 and the second pressure detection device 8 can be a pressure gauge, a barometer, etc., as long as they can detect the air pressure in the refrigerant circuit 1.

[0039] The heat pump system further includes a refrigerant branch 11, an economizer 12, and a second throttle valve 13. The first end of the refrigerant branch 11 is connected to the gas injection port 23, and the second end is connected to the refrigerant circuit 1 between the first heat exchanger 3 and the first throttle valve 4. The economizer 12 is disposed on the refrigerant circuit 1 between the refrigerant branch 11 and the first heat exchanger 3 and is also disposed on the refrigerant branch 11. The second throttle valve 13 is disposed on the refrigerant branch 11 between the second end of the refrigerant branch 11 and the economizer 12. The economizer 12 includes a non-communicating heat exchange chamber and a gas-liquid separation chamber. The heat exchange chamber is provided with a first opening and a second opening, and the gas-liquid separation chamber is provided with an inlet and a gas outlet. The first opening and the second opening are connected to the refrigerant circuit 1 between the refrigerant branch 11 and the first heat exchanger 3. The first opening is communicated with the second interface of the first throttle valve 4, and the second opening is respectively communicated with the second throttle valve 13 and the first throttle valve 4. The inlet and the gas outlet are connected to the refrigerant branch 11, so that the refrigerant in the refrigerant circuit 1 can flow from the first opening through the heat exchange chamber to the second opening, or flow from the second opening through the heat exchange chamber to the first opening; the refrigerant in the refrigerant branch can flow from the inlet through the gas-liquid separation chamber to the gas outlet.

[0040] The heat pump system further includes a charging device 14. The charging device 14 is connected to the refrigerant circuit 1 between the first heat exchanger 3 and the economizer 12. The charging device 14 is used for charging or recovering the detection gas into or from the refrigerant circuit 1; optionally, the charging device 14 realizes the recovery of the detection gas by setting a vacuum pump and a compression device. Optionally, a valve body is provided on the pipeline between the charging device 14 and the refrigerant circuit 1. The valve body is used for controlling the opening and closing of the passage between the charging device 14 and the refrigerant circuit 1. The valve body can be an electromagnetic valve, and can also be a pneumatic valve or a hydraulic valve, etc. Those skilled in the art can understand that the charging device 14 can also only charge the detection gas, and then separately set a recovery device to recover the detection gas. The recovery device is connected to the refrigerant circuit 1 between the first heat exchanger 3 and the economizer 12. The above adjustments do not deviate from the principle of the present invention and are all within the protection scope of the present invention.

[0041] The heat pump system further includes a processor and a memory. The memory is adapted to store multiple program codes, and the program codes are adapted to be loaded and run by the processor to execute the detection method of the heat pump system. The processor can be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, field-programmable gate arrays, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The memory can be an internal storage unit of the heat pump system, such as a hard disk or memory, etc.; the memory can also be an external storage device of the heat pump system. For example, a plug-in hard disk, a smart memory card, a secure digital card, a flash card, etc. equipped on the heat pump system; the memory can also include both the internal storage unit and the external storage unit of the heat pump system. The heat pump system can include multiple memories and multiple processors. Each processor executes different steps respectively. The multiple processors can be processors deployed on the same device, or processors deployed on different devices. For example, the multiple processors can be the processor on the heat pump system and the processor on the cloud server respectively.

[0042] Then refer to Figure 2 , which shows the main step flow of the detection method of the heat pump system of the present invention, specifically including the following steps:

[0043] Step S100: Control the four-way valve to perform the first action so that the exhaust port of the compressor is communicated with the first heat exchanger.

[0044] Step S101: Control the first throttle valve to close.

[0045] Step S102: Control the charging device to charge the detection gas.

[0046] Step S103: Obtain the first pressure value measured by the first pressure detection device.

[0047] Step S104: Obtain the second pressure value measured by the second pressure detection device.

[0048] Step S105: Control the four-way valve to perform the second action so that the suction port of the compressor is communicated with the first heat exchanger.

[0049] Step S106: Based on the first pressure value and the second pressure value, determine whether the four-way valve is normal.

[0050] Control the charging device to charge the detection gas into the first heat exchanger. Since the first throttle valve is closed and the four-way valve performs the first action to connect the exhaust port with the first heat exchanger, the detection gas moves from the first heat exchanger to the exhaust port and passes through the first pressure detection device. Also, because the suction port and the exhaust port of the compressor are not connected when the compressor is in a static state, the air pressure in the current path of the refrigerant circuit continuously increases as the detection gas is charged, and the first pressure value measured by the first pressure detection device should also increase accordingly. At this time, since there is no increase or decrease in the detection gas at the second pressure detection device, the second pressure value measured should remain unchanged. When the four-way valve performs the second action to connect the suction port with the first heat exchanger, the detection gas charged by the charging device moves from the first heat exchanger to the suction port and passes through the second pressure detection device. At this time, the air pressure in the current path of the refrigerant circuit also continuously increases as the detection gas is charged, and the second pressure value measured by the second pressure detection device should also increase accordingly. At this time, the detection gas at the first pressure detection device flows into the second heat exchanger through the four-way valve, and since there is no increase in the detection gas, the first pressure value measured should decrease. Therefore, based on the first pressure value and the second pressure value, it is possible to determine whether the four-way valve is normal, achieving the purpose of accurately determining whether the four-way valve installed in the heat pump system is normal.

[0051] It should be noted that the detection gas is preferably helium. Helium has the characteristics of small molecular volume, strong diffusibility, non-flammability, and no chemical reaction with other substances. Therefore, it is suitable as a detection medium. When helium is used as the detection gas, the control components can be detected while the entire heat pump system is being helium-leaked, saving operation and improving the detection efficiency. In addition, the detection gas can also be nitrogen, hydrogen, etc., which can be adjusted by those skilled in the art according to needs.

[0052] Finally, refer to Figure 3 , which shows the detailed step flow of an implementation manner of the detection method of the heat pump system of the present invention, specifically including the following steps:

[0053] Step S200: Control the four-way valve to perform the first action to connect the exhaust port of the compressor with the first heat exchanger.

[0054] Step S201: Control the first throttle valve to close.

[0055] Step S202: Control the second throttle valve to close.

[0056] Step S203: Control the charging device to charge the detection gas.

[0057] Step S204: Obtain the first pressure value measured by the first pressure detection device.

[0058] Step S205: Obtain the second pressure value measured by the second pressure detection device.

[0059] Step S206: When the first pressure value is greater than or equal to the first set value, if a disconnection signal sent by the high-pressure switch is received, it is determined that the high-pressure switch is normal.

[0060] Step S207: Control the four-way valve to perform a second action, so that the suction port of the compressor communicates with the first heat exchanger.

[0061] Step S208: If the first pressure value continuously increases when the four-way valve performs the first action and decreases when the four-way valve performs the second action, the second pressure value remains unchanged when the four-way valve performs the first action and continuously increases when the four-way valve performs the second action, it is determined that the four-way valve is normal.

[0062] Step S209: Control the charging device to close.

[0063] Step S210: Control the second throttle valve to open to a first opening degree.

[0064] Step S211: Obtain the first decreasing speed of the second pressure value.

[0065] Step S212: Control the second throttle valve to open to a second opening degree.

[0066] Step S213: Obtain the second decreasing speed of the second pressure value.

[0067] Step S214: If the second decreasing speed is greater than the first decreasing speed and the first decreasing speed is greater than zero, it is determined that the second throttle valve is normal.

[0068] Step S215: Control the second throttle valve to close.

[0069] Step S216: Control the first throttle valve to open.

[0070] Step S217: If the first pressure value decreases and the first pressure value and the second pressure value are finally the same, it is determined that the first throttle valve is normal.

[0071] Step S218: Control the charging device to recover the detection gas.

[0072] Step S219: When the second pressure value is less than or equal to the second set pressure value, if a disconnection signal sent by the low-pressure switch is received, it is determined that the low-pressure switch is normal.

[0073] Wherein, the second opening degree of the second throttle valve is greater than the first opening degree.

[0074] It should be noted that the first set pressure value is the high-pressure threshold of the high-pressure switch. When the air pressure value at the high-pressure switch is greater than or equal to the first set pressure value, the high-pressure switch closes and sends a disconnection signal. After receiving the disconnection signal, the controller controls the buzzer to alarm. The second set pressure value is the low-pressure threshold of the low-pressure switch. When the air pressure value at the low-pressure switch is less than or equal to the second set pressure value, the low-pressure switch closes and sends a disconnection signal. After receiving the disconnection signal, the controller controls the buzzer to alarm.

[0075] Through the above detection method, accurate judgment on whether the four-way valve, high-pressure switch, low-pressure switch, first throttle valve, and second throttle valve installed in the heat pump system are normal is realized.

[0076] It should be noted that the above embodiments are only used to illustrate the principle of the present invention and are not intended to limit the protection scope of the present invention. Without departing from the principle of the present invention, those skilled in the art can adjust the above embodiments so that the present invention can be applied to more specific application scenarios.

[0077] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A detection method for a heat pump system, characterized in that, the heat pump system includes a refrigerant circuit, and a compressor, a first heat exchanger, a first throttle valve and a second heat exchanger are sequentially arranged on the refrigerant circuit; the heat pump system further includes: a four-way valve for switching the refrigerant flow direction in the refrigerant circuit; a first pressure detection device arranged on one side of the exhaust port of the compressor; a second pressure detection device arranged on one side of the suction port of the compressor; a charging device capable of charging a detection gas into the first heat exchanger; the detection method includes: controlling the four-way valve to perform a first action so that the exhaust port of the compressor is communicated with the first heat exchanger; controlling the first throttle valve to close; controlling the charging device to charge the detection gas; acquiring a first pressure value measured by the first pressure detection device; acquiring a second pressure value measured by the second pressure detection device; controlling the four-way valve to perform a second action so that the suction port of the compressor is communicated with the first heat exchanger; judging whether the four-way valve is normal based on the first pressure value and the second pressure value.

2. The detection method for the heat pump system according to claim 1, characterized in that, the step of "judging whether the four-way valve is normal based on the first pressure value and the second pressure value" further includes: if the first pressure value continuously increases when the four-way valve performs the first action and decreases when the four-way valve performs the second action, the second pressure value remains unchanged when the four-way valve performs the first action, and continuously increases when the four-way valve performs the second action, it is determined that the four-way valve is normal.

3. The detection method for the heat pump system according to claim 1, characterized in that, the heat pump system further includes: a high-pressure switch arranged between the exhaust port and the first pressure detection device; after the step of "acquiring a first pressure value measured by the first pressure detection device", the detection method further includes: when the first pressure value is greater than or equal to a first set value, if a disconnection signal sent by the high-pressure switch is received, it is determined that the high-pressure switch is normal.

4. The detection method for the heat pump system according to claim 1, characterized in that, the compressor further includes a gas supplement port; the heat pump system further includes: a refrigerant branch, the first end of which is connected to the gas supplement port, and the second end is connected to the refrigerant circuit between the first heat exchanger and the first throttle valve; an economizer arranged on the refrigerant circuit between the refrigerant branch and the first heat exchanger and also arranged on the refrigerant branch; a second throttle valve arranged on the refrigerant branch between the second end of the refrigerant branch and the economizer; before, at the same time as or after the step of "controlling the first throttle valve to close", the detection method further includes: controlling the second throttle valve to close.

5. The detection method for the heat pump system according to claim 4, characterized in that, After or simultaneously with the step of "judging whether the four-way valve is normal", the detection method further includes: Controlling the charging device to close; Controlling the second throttle valve to open to a first opening degree; Obtaining a first decreasing speed of the second pressure value; Controlling the second throttle valve to open to a second opening degree; Obtaining a second decreasing speed of the second pressure value; Based on the first decreasing speed and the second decreasing speed, judging whether the second throttle valve is normal; wherein the second opening degree is greater than the first opening degree.

6. The detection method of the heat pump system according to claim 5, wherein The step of "judging whether the second throttle valve is normal based on the first decreasing speed and the second decreasing speed" further includes: If the second decreasing speed is greater than the first decreasing speed and the first decreasing speed is greater than zero, it is determined that the second throttle valve is normal.

7. The detection method of the heat pump system according to claim 5, wherein After or simultaneously with the step of "judging whether the second throttle valve is normal based on the first decreasing speed and the second decreasing speed", the detection method further includes: Controlling the second throttle valve to close; Controlling the first throttle valve to open; Based on the first pressure value and the second pressure value, judging whether the first throttle valve is normal.

8. The detection method of the heat pump system according to claim 7, wherein The step of "judging whether the first throttle valve is normal based on the first pressure value and the second pressure value" further includes: If the first pressure value decreases and the first pressure value and the second pressure value are finally the same, it is determined that the first throttle valve is normal.

9. The detection method of the heat pump system according to claim 7, wherein The heat pump system further includes: A low-pressure switch disposed between the suction port and the second pressure detection device; After or simultaneously with the step of "judging whether the first throttle valve is normal based on the first pressure value and the second pressure value", the detection method further includes: Controlling the charging device to recover the detection gas; When the second pressure value is less than or equal to a second set pressure value, if a disconnection signal sent by the low-pressure switch is received, it is determined that the low-pressure switch is normal.

10. A heat pump system, wherein The heat pump system includes: A processor; A memory adapted to store multiple program codes, and the program codes are adapted to be loaded and run by the processor to execute the detection method of the heat pump system according to any one of claims 1 to 9.

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