Air energy heat pump explosion-proof system and method

Abstract

The invention relates to an air energy heat pump anti-explosion system and method.The system comprises a heat pump unit, a leaked gas detection device and a control device, the leaked gas detection device comprises a sensor module and a self-checking module, and the sensor module detects the concentration of refrigerant leaked gas in the heat pump unit and feeds back the concentration to the control device; the control device can adjust the working state of the heat pump unit according to the refrigerant leakage gas concentration; the self-checking module detects whether the sensor module works abnormally or not, when it is detected that the sensor module works abnormally, the result is fed back to the control device, the heat pump unit is controlled to stop working, the situation that the heat pump unit cannot be shut down according to the refrigerant leakage gas concentration when the sensor module works abnormally is avoided, and the reliability of the anti-explosion system is ensured. Through cooperation of the sensor module and the self-checking module, the heat pump unit is shut down in time before refrigerant gas of the heat pump unit leaks and is far lower than the explosion concentration, and the safety of the heat pump unit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump equipment, and in particular to an explosion-proof system and method for an air-energy heat pump. Background Art

[0002] Air source is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source to a high-level heat source. It is a form of heat pump. Air source heat pumps have the beneficial effects of energy saving and environmental protection, and therefore are being used more and more widely.

[0003] As a natural working fluid, R290 has excellent thermodynamic properties and is suitable for replacing a variety of refrigerants such as R22, R134a, and R404A. However, R290 is an A3 safety-level refrigerant. When the concentration is in the range of (9.5% to 21%), it will explode if it encounters air and sparks (temperature ≥ 450°C). At present, the explosion-proof technology of air-energy heat pump products using R290 refrigerant on the market basically uses explosion-proof relay arc extinguishing, but this explosion-proof method does not monitor the accumulated concentration of R290 caused by leakage in the refrigeration system. The heat pump unit will continue to operate in extremely dangerous situations without any alarm prompts when the leakage concentration reaches the explosion concentration range, and the heat pump unit is very likely to explode. Summary of the invention

[0004] Based on this, it is necessary to provide an air energy heat pump explosion-proof system and method to address the above-mentioned problems of air energy heat pumps.

[0005] In a first aspect, the present application provides an air energy heat pump explosion-proof system, the air energy heat pump explosion-proof system comprising a heat pump unit, a gas leakage detection device and a control device;

[0006] The gas leakage detection device is arranged on the heat pump unit, and the gas leakage detection device comprises a sensor module and a self-test module, and both the sensor module and the self-test module are electrically connected to the control device;

[0007] The sensor module is configured to detect the concentration of refrigerant leakage gas in the heat pump unit; the self-check module is configured to detect whether the sensor module works abnormally;

[0008] The control device is configured to control the start and stop of the heat pump unit according to the detection results of the sensor module and / or the self-test module.

[0009] In one of the embodiments, the gas leakage detection device further includes a heating module, and the heating module is configured to heat at least the sensor module.

[0010] In one of the embodiments, the sensor module calculates the refrigerant leakage gas concentration based on the principle that the gas absorbs infrared light.

[0011] In one of the embodiments, the refrigerant type of the heat pump unit is R290.

[0012] In one embodiment, the sensor module and / or the self-test module is connected to the control device for communication via RS485.

[0013] In one embodiment, the sensor module and / or the self-test module communicates with the control device using the Modbus-RTU protocol.

[0014] In one embodiment, the air energy heat pump explosion-proof system further includes an alarm module, which is electrically connected to the control device and is configured to output an alarm signal according to the detection results of the sensor module and / or the self-test module.

[0015] In a second aspect, the present application provides an explosion-proof method for an air energy heat pump, the method comprising the following steps:

[0016] Step S200: Detect the sensor module based on the self-test module to determine whether the sensor module works abnormally;

[0017] Step S400: If the sensor module works normally, control the sensor module to obtain the concentration of refrigerant leakage gas in the heat pump unit;

[0018] Step S600: The control device compares the detection result of the sensor module with a preset concentration threshold, and controls the start and stop of the heat pump unit according to the comparison result.

[0019] In one of the embodiments, before the step of detecting the working status of the sensor module based on the self-check module to determine whether the sensor module is abnormal, the step further includes: step S100, heating the sensor module to remove moisture on the sensor module.

[0020] In one embodiment, the self-checking module is used to check the sensor module to determine whether the sensor module is working abnormally, and the specific steps include:

[0021] Acquiring current operating parameters of the sensor module based on the self-test module, and comparing the current operating parameters with a rated operating parameter range;

[0022] If the current operating parameters are within the rated operating parameter range, it is determined that the sensor module is operating normally;

[0023] If the current operating parameter does not conform to the rated operating parameter range, it is determined that the sensor module is operating abnormally.

[0024] In one embodiment, the control device compares the detection result of the sensor module with a preset concentration threshold, and controls the start and stop of the heat pump unit according to the comparison result. The specific steps include:

[0025] Compare the currently acquired refrigerant leakage gas concentration with the preset concentration threshold:

[0026] If the refrigerant leakage gas concentration is greater than or equal to the preset concentration threshold, and the duration is not less than the preset time threshold, the heat pump unit is controlled to stop working;

[0027] If the refrigerant leakage gas concentration is less than the preset concentration threshold, return to step S400.

[0028] One of the above technical solutions has the following advantages and beneficial effects:

[0029] The above-mentioned air-energy heat pump explosion-proof system includes a heat pump unit, a gas leakage detection device and a control device, wherein the gas leakage device includes a sensor module and a self-test module, the sensor module can be used to detect the concentration of refrigerant leakage gas near the heat pump unit pipeline, and feed back to the control device in real time, so that the control device can adjust the working state of the heat pump unit in time according to the concentration of refrigerant leakage gas; the self-test module can be used to detect whether the operation of the sensor module is abnormal, and when the self-test module detects that the sensor module has an abnormal operation, it feeds back to the control device to control the heat pump unit to stop working, so as to avoid the heat pump unit being unable to shut down the heat pump unit according to the concentration of refrigerant leakage gas when the sensor module is abnormal, thereby ensuring the reliability of the explosion-proof system. The present application can shut down the heat pump unit in time when the refrigerant gas of the heat pump unit leaks and is far below the explosion concentration through the cooperation of the sensor module and the self-test module, thereby improving the safety of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is one of the structural block diagrams of an air energy heat pump explosion-proof system in one embodiment;

[0031] Figure 2 This is the second structural block diagram of an air energy heat pump explosion-proof system in an embodiment;

[0032] Figure 3 A first flow chart of an explosion-proof method for an air energy heat pump in one embodiment;

[0033] Figure 4 A second flow chart of an air energy heat pump explosion-proof method in one embodiment;

[0034] Figure 5 Schematic diagram of the structure of a heat pump unit in one embodiment.

[0035] Reference numerals:

[0036] 10 heat pump unit, 11 first heat exchanger, 12 compressor, 13 second heat exchanger, 14 expansion valve, 15 four-way valve;

[0037] 20 gas leakage detection device, 21 sensor module, 22 heating module, 23 self-test module;

[0038] 30 control device; 40 alarm module. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0042] If similar descriptions of "first\second\third" appear in the application documents, the following instructions will be added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0043] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present invention belong. Terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present invention.

[0044] In one embodiment, Figure 1 As shown, an air energy heat pump explosion-proof system is provided, the explosion-proof system comprises a heat pump unit 10, a gas leakage detection device 20 and a control device 30,

[0045] The gas leakage detection device 20 is arranged on the heat pump unit 10, and the gas leakage detection device 20 comprises a sensor module 21 and a self-test module 23, and both the sensor module 21 and the self-test module 23 are electrically connected to the control device 30;

[0046] The sensor module 21 is configured to detect the concentration of refrigerant leakage gas in the heat pump unit 10; the self-check module 23 is configured to detect whether the sensor module 21 works abnormally;

[0047] The control device 30 is configured to control the start and stop of the heat pump unit 10 according to the detection results of the sensor module 21 and / or the self-detection module 23 .

[0048] The heat pump unit 10 can be used to transfer the heat energy in the environment, thereby achieving heating in winter and cooling in summer, and can generate hot water while providing heating. Figure 5 As shown, the heat pump unit 10 includes a first heat exchanger 11, a compressor 12, a second heat exchanger 13, an expansion valve 14, a four-way valve 15, a refrigerant and corresponding connecting pipes; during heating, the liquid refrigerant evaporates in the first heat exchanger 11 and absorbs heat energy in the air; then, the low-temperature and low-pressure liquid refrigerant is compressed by the compressor 12 into a high-temperature and high-pressure gaseous refrigerant; then, the high-temperature and high-pressure gaseous refrigerant enters the second heat exchanger 13 to release heat to obtain a low-temperature and high-pressure liquid refrigerant. In this process, cold water can absorb the heat in the heat release process, thereby increasing the water temperature; finally, the low-temperature and high-pressure liquid refrigerant is throttled by the expansion valve 14 to obtain a low-temperature and low-pressure liquid refrigerant. It should be noted that the first heat exchanger 11 can be a fin-tube heat exchanger; the second heat exchanger 13 can be a plate heat exchanger.

[0049] The gas leakage detection device 20 can be installed on the heat pump assembly. For example, the gas leakage detection device 20 is installed on the first heat exchanger 11. The gas leakage detection device 20 may include a sensor module 21 and a self-test module 23. The sensor module 21 can be used to detect the concentration of refrigerant leakage gas near the pipeline of the heat pump unit 10, and provide real-time feedback to the control device 30, so that the control device 30 can adjust the working state of the heat pump unit 10 in time according to the concentration of refrigerant leakage gas. Exemplarily, when the concentration of refrigerant leakage gas detected in real time by the sensor module 21 reaches a preset concentration threshold, the control device 30 immediately controls the heat pump unit 10 to stop working. It should be noted that the preset concentration threshold can be a concentration value far lower than the explosion concentration of the refrigerant gas, ensuring that the unit controller commands the heat pump unit 10 to stop working before the detected concentration is far lower than the explosion concentration, avoiding the dangerous situation that the unit continues to operate in the explosion concentration range and may cause an explosion.

[0050] The self-check module 23 can be used to detect whether the sensor module 21 is working abnormally. For example, the self-check module 23 can detect whether the sensor module 21 has reached its service life, whether the power supply voltage is abnormal, whether the communication connection is abnormal, etc. When the self-check module 23 detects that the sensor module 21 is working abnormally, it will feedback to the control device 30 to control the heat pump unit 10 to stop working, so as to avoid the heat pump unit 10 being unable to shut down the heat pump unit 10 according to the refrigerant leakage gas concentration when the sensor module 21 is working abnormally.

[0051] The air energy heat pump explosion-proof system of the present invention comprises a heat pump unit 10, a gas leakage detection device 20 and a control device 30, wherein the gas leakage device comprises a sensor module 21 and a self-checking module 23, wherein the sensor module 21 can be used to detect the concentration of the refrigerant leakage gas near the pipeline of the heat pump unit 10, and feedback to the control device 30 in real time, thereby enabling the control device 30 to adjust the working state of the heat pump unit 10 in time according to the concentration of the refrigerant leakage gas; the self-checking module 23 can be used to detect whether the sensor module 21 is working abnormally, and when the self-checking module 23 detects that the sensor module 21 is working abnormally, feedback is given to the control device 30 to control the heat pump unit 10 to stop working, thereby preventing the heat pump unit 10 from being unable to shut down the heat pump unit 10 according to the concentration of the refrigerant leakage gas when the sensor module 21 is working abnormally, thereby ensuring the reliability of the explosion-proof system. The present application can shut down the heat pump unit 10 in time before the refrigerant gas in the heat pump unit 10 leaks and is far below the explosion concentration through the cooperation of the sensor module 21 and the self-checking module 23, thereby improving the safety of the heat pump unit 10.

[0052] like Figure 2 As shown, in some embodiments, the gas leakage detection device 20 further includes a heating module 22 , and the heating module 22 is configured to heat at least the sensor module 21 .

[0053] The above embodiment further defines that a heating module 22 is provided to heat the sensor module 21 , which can remove residual water vapor from the sensor module 21 and reduce the influence of the residual water vapor on the performance of the sensor module 21 , thereby improving the accuracy and response speed of the sensor module 21 .

[0054] Among them, the heating module 22 can be used to heat the sensor module 21 to remove the residual water vapor on the surface of the sensor module 21 to ensure the accuracy of the measurement. Specifically, before the sensor module 21 detects the gas concentration for the first time after power-on, the heating module 22 removes the residual water vapor on the surface of the sensor module 21 to avoid the residual water vapor affecting the measurement accuracy of the sensor module 21. It should be noted that, in some embodiments, the heating module 22 can also heat the sensor module 21 during the process of detecting the concentration of refrigerant leakage gas. In addition, heating the sensor module 21 can also remove oil mist, dust, etc. on the surface of the sensor module 21, further ensuring the accuracy of the measurement and the long-term stability of the sensor module 21.

[0055] In some embodiments, the sensor module 21 calculates the refrigerant leakage gas concentration based on the principle that the gas absorbs infrared light.

[0056] The above embodiment further defines that the sensor module 21 calculates the refrigerant leakage gas concentration based on the principle that the gas absorbs infrared light, and is therefore not affected by changes in ambient temperature and pressure and has good stability.

[0057] Among them, the sensor module 21 can calculate the gas concentration based on the principle that the leaked refrigerant gas can absorb infrared light. For example, the sensor module 21 may include an infrared light source, an optical path system, an infrared detector and a signal processing module. Specifically, the infrared light source generates infrared light within a specific wavelength range, and the optical path system ensures that the infrared light emitted by the infrared light source selectively and smoothly passes through the leaked gas. The infrared detector converts the received infrared light into an electrical signal, and the signal processing module can amplify the received electrical signal and obtain the refrigerant leakage gas concentration from the amplified electrical signal according to the Lambert-Beer law. It should be noted that the Lambert-Beer law is based on the fact that the higher the concentration of the leaked gas, the more it absorbs infrared light of a specific wavelength, and the refrigerant leakage gas concentration is obtained according to the light intensity received by the infrared detector and the light intensity when the infrared light is incident.

[0058] In some embodiments, the refrigerant type of the heat pump unit 10 is R290.

[0059] In some embodiments, the sensor module 21 and / or the self-test module 23 are connected to the control device 30 for communication via RS485.

[0060] In some embodiments, the sensor module 21 and / or the self-test module 23 communicate with the control device 30 using the Modbus-RTU protocol.

[0061] like Figure 2 As shown, in some embodiments, the air energy heat pump explosion-proof system further includes an alarm module 40, which is electrically connected to the control device 30, and the alarm module 40 is configured to output an alarm signal according to the detection results of the sensor module 21 and / or the self-test module 23.

[0062] Among them, the alarm module 40 can be used to output an alarm signal according to the detection result of the sensor module 21 or the detection result of the self-test module 23. For example, when the detection result of the sensor module 21 is that the concentration of the refrigerant leakage gas is greater than the preset concentration threshold, the alarm module 40 sends an alarm signal. When the self-test module 23 detects that the sensor module 21 is working abnormally, the alarm module 40 also sends an alarm signal. The alarm signal can be one or a combination of sound, light, and text push. Exemplarily, the alarm module 40 is a buzzer. When the self-test module 23 detects that the sensor module 21 is working abnormally, the alarm module 40 buzzes to prompt the staff to deal with it in time.

[0063] like Figure 3 As shown, an embodiment of the present invention provides an explosion-proof method for an air energy heat pump, the explosion-proof method comprising:

[0064] Step S200: Detect the sensor module 21 based on the self-check module 23 to determine whether the sensor module 21 works abnormally;

[0065] Step S400: If the sensor module 21 works normally, the sensor module 21 is controlled to obtain the concentration of the refrigerant leakage gas in the heat pump unit 10;

[0066] Step S600: The control device 30 compares the detection result of the sensor module 21 with the preset concentration threshold, and controls the start and stop of the heat pump unit 10 according to the comparison result.

[0067] Specifically, the self-check module 23 can detect whether the sensor module 21 is working normally after the sensor module 21 is powered on and before starting to detect the gas concentration. When it is determined that the sensor module 21 is working abnormally, the heat pump unit 20 stops working; when it is determined that the sensor module 21 is working normally, the heat pump unit 10 works normally, and the sensor module 21 is controlled to detect the refrigerant leakage gas concentration in the heat pump unit 10. When the detected refrigerant leakage gas concentration is greater than or equal to the preset concentration threshold, the control device 30 outputs a control signal to stop the heat pump unit 10; when the detected refrigerant leakage gas concentration is less than the preset concentration threshold, the heat pump unit 10 continues to operate.

[0068] Among them, the preset concentration threshold can be set according to 10% to 30% of the minimum flammable concentration in the refrigerant gas and air mixture. Exemplarily, the preset concentration threshold is set to 20% LFL. If the sensor module 21 detects that the concentration of the leaked refrigerant gas is greater than or equal to 20% LFL, the control device 30 controls the heat pump unit 10 to stop working; when the refrigerant leakage gas concentration detected by the sensor module 21 is less than 20% LFL, the heat pump unit 10 continues to operate. It should be noted that the preset concentration threshold needs to be adjusted according to the type of refrigerant. In this embodiment, the type of refrigerant is R290.

[0069] like Figure 4 As shown, in some embodiments, before the step of detecting the sensor module 21 based on the self-test module 23 to determine whether the sensor module 21 is abnormal, it also includes: step S100, heating the sensor module 21 to remove water vapor on the sensor module 21.

[0070] Before the working state of the sensor module 21 is detected, the sensor module 21 needs to be heated by the heating module 22 to remove the residual water vapor on the surface of the sensor module 21 to avoid the residual water vapor affecting the measurement accuracy of the sensor module 21. In addition, it should be noted that the heating module 22 can also heat the sensor module 21 during the process of detecting the concentration of the refrigerant leakage gas.

[0071] In some embodiments, the self-checking module 23 detects the sensor module 21 to determine whether the sensor module 21 is working abnormally. The specific steps include:

[0072] Based on the self-test module 23, the current working parameters of the sensor module 21 are obtained, and the current working parameters are compared with the rated working parameter range. If the current working parameters are within the rated working parameter range, it is judged that the sensor module 21 is working normally; if the current working parameters do not meet the rated working parameter range, it is judged that the sensor module 21 is working abnormally.

[0073] Among them, the current working parameters may include one or more of the use time, power supply voltage, working environment temperature, working environment humidity, and data transmission rate. For example, the current working parameters include the use time, and the rated working parameter range corresponding to the sensor module 21 is fifteen years. If the self-test module 23 detects that the use time of the sensor module 21 has reached fifteen years, it is judged that the sensor module 21 is abnormal, and the control device 30 controls the heat pump unit 10 to stop working; if the self-test module 23 detects that the use time of the sensor module 21 is less than fifteen years, the sensor module 21 is controlled to normally detect the refrigerant leakage gas concentration in the heat pump unit 10. In another example, the current working parameters include the use time and the data transmission rate. Only when the use time and the data transmission rate are in the corresponding rated working parameter range, the sensor module 21 will be judged to be working normally. By obtaining the current working parameters of the sensor module 21 and comparing them with the rated working parameter range, it is possible to detect whether the sensor module 21 is faulty, so as to avoid the failure of the sensor module 21 to detect the refrigerant leakage gas concentration in the heat pump unit 10 in a normal manner due to the failure of the sensor module 21.

[0074] In some embodiments, the control device 30 compares the detection result of the sensor module 21 with the preset concentration threshold, and controls the start and stop of the heat pump unit 10 according to the comparison result. The specific steps include:

[0075] Compare the currently acquired refrigerant leakage gas concentration with the preset concentration threshold:

[0076] If the concentration of the refrigerant leakage gas is greater than or equal to the preset concentration threshold, and the duration is not less than the preset time threshold, the heat pump unit 10 is controlled to stop working;

[0077] If the concentration of the refrigerant leakage gas is less than the preset concentration threshold, return to step S400.

[0078] Specifically, by comparing the duration when the refrigerant leakage gas concentration exceeds the preset concentration threshold with the preset time threshold, the heat pump unit 10 is controlled to stop working only when the duration when the refrigerant leakage gas concentration exceeds the preset concentration threshold is greater than the preset time. This can avoid the heat pump component 10 being mistakenly shut down or frequently started and stopped due to the refrigerant leakage gas concentration instantaneously being greater than or equal to the preset concentration threshold.

[0079] Among them, the preset time threshold can be set according to actual conditions and is not limited here. The preset time threshold should be set to no less than 0. For example, the preset time threshold is 10 seconds, and the preset concentration threshold is 20% LFL. When it is detected that the current refrigerant leakage gas concentration is greater than 20% LFL and the duration is greater than 10 seconds, the control device 30 controls the heat pump unit 10 to stop working.

[0080] It should be understood that although Figure 3-4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 3-4 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0081] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAMbus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM).

[0082] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An air energy heat pump explosion-proof system, characterized in that: It comprises a heat pump unit (10), a gas leakage detection device (20) and a control device (30); The gas leakage detection device (20) is arranged on the heat pump unit (10), and the gas leakage detection device (20) comprises a sensor module (21) and a self-test module (23), and both the sensor module (21) and the self-test module (23) are electrically connected to the control device (30); The sensor module (21) is configured to detect the concentration of refrigerant leakage gas in the heat pump unit (10), and the self-check module (23) is configured to detect whether the sensor module (21) is working abnormally; The control device (30) is configured to control the start and stop of the heat pump unit (10) according to the detection results of the sensor module (21) and / or the self-detection module (23).

2. The air energy heat pump explosion-proof system according to claim 1, characterized in that: The gas leakage detection device (20) further comprises a heating module (22), wherein the heating module (22) is configured to heat at least the sensor module (21).

3. The air energy heat pump explosion-proof system according to claim 1, characterized in that: The sensor module (21) calculates the concentration of refrigerant leakage gas based on the principle that gas absorbs infrared light.

4. The air energy heat pump explosion-proof system according to claim 3, characterized in that: The refrigerant type of the heat pump unit (10) is R290.

5. The air energy heat pump explosion-proof system according to claim 1, characterized in that: The sensor module (21) and / or the self-test module (23) are connected to the control device (30) for communication via RS485; and / or, The sensor module (21) and / or the self-test module (23) communicate with the control device (30) using the Modbus-RTU protocol.

6. The air energy heat pump explosion-proof system according to claim 1, characterized in that: It also comprises an alarm module (40), the alarm module (40) being electrically connected to the control device (30), and the alarm module (40) being configured to output an alarm signal according to the detection results of the sensor module (21) and / or the self-test module (23).

7. An air energy heat pump explosion-proof method, applied to an air energy heat pump explosion-proof system as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step S200: testing the sensor module (21) based on the self-test module (23) to determine whether the sensor module (21) is working abnormally; Step S400: If the sensor module (21) works normally, control the sensor module (21) to detect the concentration of refrigerant leakage gas in the heat pump unit (10); Step S600: The control device (30) compares the detection result of the sensor module (21) with the preset concentration threshold, and controls the start and stop of the heat pump unit (10) according to the comparison result.

8. The explosion-proof method for air-energy heat pump according to claim 7, characterized in that: Before the step of detecting the sensor module (21) based on the self-check module (23) to determine whether the sensor module (21) is working abnormally, the method further comprises: step S100, heating the sensor module (21) to remove water vapor on the sensor module (21).

9. The explosion-proof method of air energy heat pump according to claim 7, characterized in that: The self-checking module (23) detects the sensor module (21) to determine whether the sensor module (21) is working abnormally, and the specific steps include: Acquiring current operating parameters of the sensor module (21) based on the self-checking module (23), and comparing the current operating parameters with a rated operating parameter range; If the current operating parameter is within the rated operating parameter range, it is determined that the sensor module (21) is operating normally; If the current operating parameter does not conform to the rated operating parameter range, it is determined that the sensor module (21) is operating abnormally.

10. The explosion-proof method of air energy heat pump according to claim 7, characterized in that: The specific steps of the control device (30) comparing the detection result of the sensor module (21) with a preset concentration threshold and controlling the start and stop of the heat pump unit (10) according to the comparison result include: Compare the currently acquired refrigerant leakage gas concentration with the preset concentration threshold: If the concentration of the refrigerant leakage gas is greater than or equal to the preset concentration threshold, and the duration is not less than the preset time threshold, controlling the heat pump unit (10) to stop working; If the refrigerant leakage gas concentration is less than the preset concentration threshold, return to step S400.

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