Four-way valve anomaly detection method and device, medium and equipment

Abstract

The invention discloses a four-way valve anomaly detection method and device, a medium and equipment, the theoretical operation state of a heat pump unit is determined firstly, then preset operation parameters corresponding to the theoretical operation state are obtained, and if the parameters meet preset abnormal operation conditions, it is judged that the four-way valve of the heat pump unit operates abnormally. According to the method, the abnormal operation condition of the four-way valve can be found in time based on the preset operation parameters in different theoretical operation states, and the stability and reliability of equipment are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, and in particular to a method, device, medium and equipment for detecting abnormal conditions of a four-way valve. Background Art

[0002] As an efficient energy supply device, heat pump units are widely used in daily life and industrial production. However, during the operation of existing heat pump units, due to problems such as abnormal system pressure and too low voltage, the four-way valve often gets stuck when switching between the refrigeration and heating modes, which will cause the heat pump unit to fail to operate normally. But existing heat pump units often have difficulty in detecting the abnormal conditions of the four-way valve in a timely manner, which greatly affects the stability and reliability of the equipment. Summary of the Invention

[0003] Based on this, it is necessary to provide a method, device, medium and equipment for detecting abnormal conditions of a four-way valve to solve the problem that the abnormal conditions of the four-way valve cannot be detected in a timely manner.

[0004] In a first aspect, an embodiment of the present application provides a method for detecting abnormal conditions of a four-way valve, which is applied to a heat pump unit. The method includes:

[0005] Determine the theoretical operating state of the heat pump unit, and obtain the preset operating parameters corresponding to the theoretical operating state;

[0006] If the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally.

[0007] In some embodiments of the present application, when the theoretical operating state is the heating state, the obtaining of the preset operating parameters corresponding to the theoretical operating state includes:

[0008] Obtain the temperature difference between the inlet and outlet water within a preset first time period, obtain the average value of the first inlet water temperature within a preset second time period, and obtain the average value of the second inlet water temperature within a preset third time period; wherein, the third time period is after the second time period;

[0009] The if the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally includes:

[0010] If the preset operating parameters meet the preset first abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally; wherein, the first abnormal operating conditions are that the temperature difference between the inlet and outlet water continuously is greater than or equal to a preset first temperature difference threshold within the first time period, and the temperature difference between the average value of the first inlet water temperature and the average value of the second inlet water temperature is greater than a preset second temperature difference threshold, and the first temperature difference threshold and the second temperature difference threshold are non-negative numbers.

[0011] In some embodiments of the present application, when the theoretical operating state is the heating state, the obtaining of the preset operating parameters corresponding to the theoretical operating state includes:

[0012] Obtaining the temperature difference between the suction and discharge temperatures within a preset fourth time period, obtaining the average value of the third inlet water temperature within a preset fifth time period, and obtaining the average value of the fourth inlet water temperature within a preset sixth time period; wherein, the sixth time period is after the fifth time period;

[0013] The determining that the four-way valve of the heat pump unit operates abnormally if the preset operating parameters meet the preset abnormal operating conditions includes:

[0014] If the preset operating parameters meet the preset second abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally; wherein, the second abnormal operating conditions are that the temperature difference between the suction and discharge temperatures is continuously less than or equal to a preset third temperature difference threshold within the fourth time period, and the temperature difference between the average value of the third inlet water temperature and the average value of the fourth inlet water temperature is greater than a preset fourth temperature difference threshold, and the third temperature difference threshold and the fourth temperature difference threshold are non-negative numbers.

[0015] In some embodiments of the present application, when the theoretical operating state is the defrosting state, the obtaining of the preset operating parameters corresponding to the theoretical operating state includes:

[0016] Obtaining the outdoor condenser temperature during defrosting, obtaining the average value of the first outlet water temperature within a preset seventh preset time period, and obtaining the average value of the second outlet water temperature within a preset eighth preset time period; wherein, the eighth preset time period is after the seventh preset time period;

[0017] The determining that the four-way valve of the heat pump unit operates abnormally if the preset operating parameters meet the preset abnormal operating conditions includes:

[0018] If the preset operating parameters meet the preset third abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally; wherein, the third abnormal operating conditions are that the outdoor condenser temperature is continuously less than a preset temperature threshold during defrosting, and the temperature difference between the average value of the first outlet water temperature and the average value of the second outlet water temperature is less than a preset fifth temperature difference threshold, and the fifth temperature difference threshold is a non-negative number.

[0019] In some embodiments of the present application, the determining of the theoretical operating state of the heat pump unit includes:

[0020] When the heat pump unit operates in the heating mode for a preset first duration and the current compressor frequency of the heat pump unit is greater than or equal to a preset first frequency threshold, it is determined that the theoretical operating state is the heating state.

[0021] In some embodiments of the present application, determining the theoretical operating state of the heat pump unit includes:

[0022] When the heat pump unit exits the defrost mode for a preset second duration and the current compressor frequency of the heat pump unit is greater than or equal to a preset second frequency threshold, determine that the theoretical operating state is the heating state.

[0023] In some embodiments of the present application, determining the theoretical operating state of the heat pump unit includes:

[0024] When the heat pump unit enters the defrost mode and the compressor frequency of the heat pump unit is greater than or equal to a preset third frequency threshold for a third duration, determine that the theoretical operating state is the defrost state.

[0025] In a second aspect, an embodiment of the present application further provides a four-way valve abnormality detection device, and the four-way valve abnormality detection device includes:

[0026] A parameter acquisition module, configured to determine the theoretical operating state of the heat pump unit and acquire preset operating parameters corresponding to the theoretical operating state;

[0027] An abnormality detection module, configured to determine that the four-way valve of the heat pump unit operates abnormally if the preset operating parameters meet preset abnormal operating conditions.

[0028] In a third aspect, an embodiment of the present application further provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps in the above four-way valve abnormality detection method are implemented.

[0029] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above four-way valve abnormality detection method are implemented.

[0030] In a fifth aspect, an embodiment of the present application further provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in various alternative implementation manners of the embodiments of the present application.

[0031] The present invention provides a method, device, medium and equipment for detecting abnormal conditions of a four-way valve. First, the theoretical operating state of a heat pump unit is determined, and then the preset operating parameters corresponding to the theoretical operating state are obtained. If these parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally. The present invention can timely detect abnormal conditions of the four-way valve based on the preset operating parameters under different theoretical operating states, greatly improving the stability and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Among them:

[0034] Figure 1 is a schematic flow chart of the method for detecting abnormal conditions of the four-way valve;

[0035] Figure 2 is a schematic structural diagram of the device for detecting abnormal conditions of the four-way valve;

[0036] Figure 3 is a structural block diagram of the terminal device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] The terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0039] References to "embodiments" in this specification mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0040] Please refer to Figure 1 , Figure 1 which is a schematic flow chart of the four-way valve abnormality detection method provided by an embodiment of the present application. Although the logical order is shown in the flow chart, in some cases, the steps shown or described can be executed in a different order than that shown in the drawings. The four-way valve abnormality detection method provided by the embodiment of the present application is applied to a heat pump unit. As a key component in the heat pump unit, the main function of the four-way valve is to switch the flow direction of the refrigerant between the heating and cooling modes. When the four-way valve malfunctions, it will cause the heat pump unit to fail to operate properly, affecting the user experience, and may even cause system damage. Therefore, timely detection of the abnormal state of the four-way valve is of great significance for ensuring the normal operation of the heat pump unit.

[0041] Specifically, the specific process of the four-way valve abnormality detection method provided by the embodiment of the present application is as follows:

[0042] S101, Determine the theoretical operating state of the heat pump unit and obtain the preset operating parameters corresponding to the theoretical operating state.

[0043] Among them, the theoretical operating state of the heat pump unit refers to the operating state that the heat pump unit should theoretically be in after stabilization, mainly including heating state, cooling state, defrosting state, etc. The preset operating parameters refer to the key parameters that can reflect the working state of the four-way valve, including but not limited to inlet water temperature, outlet water temperature, compressor suction temperature, and compressor discharge temperature, etc.

[0044] It can be understood that under different operating states, there are differences in the working parameters and performance characteristics of the heat pump unit. Therefore, it is necessary to select the corresponding preset operating parameters according to different operating states for subsequent abnormality detection.

[0045] In the embodiment of the present application, the theoretical operating state of the heat pump unit can be determined by obtaining the current working mode of the heat pump unit and / or the working frequency of the compressor.

[0046] S102, If the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally.

[0047] Among them, the preset abnormal operating conditions refer to the combination of conditions that can reflect the abnormal working state of the four-way valve. Under different theoretical operating states, the preset abnormal operating conditions are also different. If the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally. On the contrary, if the preset operating parameters do not meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating normally.

[0048] In the above embodiment, first determine the theoretical operating state of the heat pump unit, and then obtain the preset operating parameters corresponding to the theoretical operating state. If these parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally. This embodiment can timely detect the abnormal operation of the four-way valve based on the preset operating parameters under different theoretical operating states, greatly improving the stability and reliability of the equipment.

[0049] In some embodiments of the present application, determining the theoretical operating state of the heat pump unit in S101 includes: when the heat pump unit operates in the heating mode for a preset first duration, and the current compressor frequency of the heat pump unit is greater than or equal to a preset first frequency threshold, determining the theoretical operating state as the heating state.

[0050] Among them, the heating mode here is the working mode in which the heat pump unit transfers the heat in the air to the water to achieve the work of heating the water. Optionally, the preset first duration can be set to 6 minutes, and the preset first frequency threshold can be set to 60 Hz.

[0051] It can be understood that when the heat pump unit just enters the heating mode or the stage with large frequency fluctuations, the system parameters are not yet stable. At this time, detecting the abnormality of the four-way valve may lead to misjudgment. Therefore, it is necessary to ensure that the heat pump unit has been stably operating in the heating mode for a period of time and the compressor frequency reaches a certain level before determining the theoretical operating state as the heating state, and then detecting the abnormality of the four-way valve in the heating state.

[0052] In some embodiments of the present application, determining the theoretical operating state of the heat pump unit in S101 includes: when the heat pump unit exits the defrosting mode for a preset second duration, and the current compressor frequency of the heat pump unit is greater than or equal to a preset second frequency threshold, determining the theoretical operating state as the heating state.

[0053] Among them, the heating mode here is the working mode in which the heat pump unit transfers the heat in the air to the water to achieve the work of heating the water. Optionally, the preset second duration can be set to 6 minutes, and the preset second frequency threshold can be set to 60 Hz.

[0054] It can be understood that after the heat pump unit exits the defrosting mode, it takes some time to return to a stable heating state. During this process, the system parameters may fluctuate greatly, and abnormal detection of the four-way valve at this time may lead to misjudgment. Therefore, it is necessary to ensure that the heat pump unit has been operating stably for a certain period of time after exiting the defrosting mode and the compressor frequency reaches a certain level before determining that the theoretical operating state is the heating state, and then performing abnormal detection of the four-way valve in the heating state.

[0055] In some embodiments of the present application, determining the theoretical operating state of the heat pump unit in S101 includes: when the heat pump unit enters the defrosting mode and the compressor frequency of the heat pump unit is greater than or equal to a preset third frequency threshold for a third duration, determining that the theoretical operating state is the defrosting state.

[0056] Here, the defrosting mode refers to the operating mode in which the heat pump unit heats the outdoor condenser for defrosting. Optionally, the preset third duration can be set to 10 s, and the preset second frequency threshold can be set to 30 Hz.

[0057] Similarly, after the heat pump unit enters the defrosting mode, it takes some time to operate stably. During this process, the system parameters may fluctuate greatly, and abnormal detection of the four-way valve at this time may lead to misjudgment. Therefore, it is necessary to ensure that the heat pump unit has been operating stably for a certain period of time after entering the defrosting mode and the compressor frequency reaches a certain level before determining that the theoretical operating state is the defrosting state, and then performing abnormal detection of the four-way valve in the defrosting state.

[0058] In some embodiments of the present application, when the theoretical operating state is the heating state, obtaining the preset operating parameters corresponding to the theoretical operating state in S101 includes:

[0059] S101a, obtaining the temperature difference between the inlet and outlet water within a preset first time period, obtaining the average value of the first inlet water temperature within a preset second time period, and obtaining the average value of the second inlet water temperature within a preset third time period.

[0060] Among them, the third time period is after the second time period. The temperature difference between the inlet and outlet water refers to the difference between the inlet water temperature and the outlet water temperature in the water tank during the operation of the heat pump unit. The average value of the first inlet water temperature refers to the average value obtained by measuring the inlet water temperature of the heat pump unit multiple times within the preset second time period. The average value of the second inlet water temperature refers to the average value obtained by measuring the inlet water temperature of the heat pump unit multiple times within the preset third time period. Both the average value of the first inlet water temperature and the average value of the second inlet water temperature are used to reflect the inlet water temperature level during this time period. Combining the average value of the first inlet water temperature and the average value of the second inlet water temperature can be used to judge the temperature fluctuation before and after.

[0061] If the preset operating parameters in S102 meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally, including:

[0062] S102a, if the preset operating parameters meet the preset first abnormal operating condition, it is determined that the four-way valve of the heat pump unit operates abnormally.

[0063] Among them, the first abnormal operating condition is that the temperature difference between the inlet water and the outlet water continuously exceeds or is equal to the preset first temperature difference threshold within the first time period, and the temperature difference between the average value of the first inlet water temperature and the average value of the second inlet water temperature is greater than the preset second temperature difference threshold. The first temperature difference threshold and the second temperature difference threshold are non-negative numbers.

[0064] Optionally, the preset first time period can be set to 120s continuously, the preset second time period can be set to the first 60s of this 120s, and the preset third time period can be set to the last 60s of this 120s. The preset first temperature difference threshold can be set to 1.5°C, and the preset second temperature difference threshold can be set to 0°C.

[0065] It can be understood that an air-source heat pump is a device that uses the heat in the air to heat water. If the four-way valve works normally, then in the heating state, it can absorb the heat in the external air and transfer this part of the heat to the water. Then the inlet water temperature entering the heat pump is relatively low, and after being heated by the heat pump, the outlet water temperature rises. Therefore, under normal circumstances, the inlet water temperature is lower than the outlet water temperature. At the same time, as the heat pump continues to operate, the water temperature in the water tank gradually rises. If the inlet water is circulated and extracted from the water tank, then over time, the inlet water temperature should also gradually rise.

[0066] Once in the heating state, when the temperature difference between the inlet water and the outlet water continuously exceeds or is equal to the preset first temperature difference threshold within the first time period, it means that the heat pump is not currently heating, indicating that there is an abnormality in the system, which may be due to an abnormality in the four-way valve. Similarly, when the temperature difference between the average value of the first inlet water temperature and the average value of the second inlet water temperature is greater than the preset second temperature difference threshold, it means that the inlet water temperature is decreasing, which also indicates that there is an abnormality in the system, further corroborating the possibility of an abnormality in the four-way valve. In fact, if the preset operating parameters meet the preset first abnormal operating condition, the current actual operating state of the heat pump unit is closer to the cooling state rather than the heating state of the theoretical operating state. Therefore, in this embodiment, when the preset first abnormal operating condition is met, it is determined that the four-way valve of the heat pump unit operates abnormally.

[0067] In the above embodiment, by monitoring the dynamic change of the inlet water temperature, a simple and effective abnormal detection method is provided, which helps to detect problems in time and protect the equipment.

[0068] In some embodiments of the present application, when the theoretical operating state is the heating state, obtaining the preset operating parameters corresponding to the theoretical operating state in S101 includes:

[0069] S101b, obtaining the temperature difference between the suction and discharge temperatures within a preset fourth time period, obtaining the average value of the third inlet water temperature within a preset fifth time period, and obtaining the average value of the fourth inlet water temperature within a preset sixth time period.

[0070] Among them, the sixth time period is after the fifth time period. The suction and discharge temperature refers to the difference between the discharge temperature and the suction temperature of the compressor during the operation of the heat pump unit. The average value of the third inlet water temperature refers to the average value calculated by measuring the inlet water temperature of the heat pump multiple times within the fifth time period. The average value of the fourth inlet water temperature refers to the average value calculated by measuring the inlet water temperature of the heat pump multiple times within the sixth time period. Combining the average value of the third inlet water temperature and the average value of the fourth inlet water temperature can be used to judge the temperature fluctuations before and after.

[0071] If the preset operating parameters in S102 meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally, including:

[0072] S101b, if the preset operating parameters meet the preset second abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally.

[0073] Among them, the second abnormal operating condition is that the temperature difference between the suction and discharge temperatures is continuously less than or equal to a preset third temperature difference threshold within the fourth time period, and the temperature difference between the average value of the third inlet water temperature and the average value of the fourth inlet water temperature is greater than a preset fourth temperature difference threshold. The third temperature difference threshold and the fourth temperature difference threshold are non-negative numbers.

[0074] Optionally, the preset fourth time period can be set to 120 s continuously, the preset fifth time period can be set to the first 60 s of this 120 s, and the preset sixth time period can be set to the last 60 s of this 120 s. The preset third temperature difference threshold can be set to 20 °C, and the preset fourth temperature difference threshold can be set to 0 °C.

[0075] It can be understood that if the four-way valve works normally, then in the heating state, the refrigerant absorbs the heat of the external air in the evaporator and evaporates into a gas (the temperature is the suction temperature at this time). The compressor compresses the refrigerant into a high-temperature and high-pressure gas (the temperature is the discharge temperature at this time). The high-temperature and high-pressure refrigerant releases heat to the water in the condenser, the water temperature rises, and the refrigerant condenses into a liquid. The refrigerant returns to the evaporator after decompression through the expansion valve to complete the cycle.

[0076] Once in the heating state, if the difference between the suction and discharge air temperatures remains less than or equal to the third temperature difference threshold within the fourth time period, it indicates that the system does not exhibit the characteristics of the heating state. It may be that the four-way valve is not correctly switched to the heating mode, resulting in abnormal refrigerant flow. At the same time, if the difference between the average value of the third inlet water temperature and the average value of the fourth inlet water temperature is greater than the preset fourth temperature difference threshold, that is, the inlet water temperature is decreasing, it means that the system has not achieved the expected heating effect, further corroborating that the four-way valve may be abnormal. In fact, if the preset operating parameters meet the preset second abnormal operating condition, the current actual operating state of the heat pump unit is closer to the state of gas cross, rather than the heating state of the theoretical operating state. Therefore, in this embodiment, when the preset second abnormal operating condition is met, it is determined that the four-way valve of the heat pump unit operates abnormally.

[0077] In the above embodiment, by monitoring the change trends of the suction and discharge air temperature differences and the inlet water temperature, simple and effective abnormal judgment conditions are designed. When the suction and discharge air temperature differences are small and the inlet water temperature drops, it indicates that the heat pump is not heating normally, and it is determined that the four-way valve of the heat pump unit operates abnormally. This method can detect problems in a timely manner, protect the equipment, and ensure the stable operation of the air source heat pump system.

[0078] In some embodiments of the present application, when the theoretical operating state is the defrosting state, the preset operating parameters obtained in S101 include:

[0079] S101c, obtaining the outdoor condenser temperature during the defrosting period, obtaining the average value of the first outlet water temperature within the preset seventh preset time period, and obtaining the average value of the second outlet water temperature within the preset eighth preset time period.

[0080] Among them, the eighth preset time period is after the seventh preset time period. The average value of the first outlet water temperature refers to the average value calculated by measuring the outlet water temperature of the heat pump multiple times within the seventh preset time period. The average value of the second outlet water temperature refers to the average value calculated by measuring the outlet water temperature of the heat pump multiple times within the eighth preset time period.

[0081] In S102, if the preset operating parameters meet the preset abnormal operating condition, it is determined that the four-way valve of the heat pump unit operates abnormally, including:

[0082] S101c, if the preset operating parameters meet the preset third abnormal operating condition, it is determined that the four-way valve of the heat pump unit operates abnormally.

[0083] Among them, the third abnormal operating condition is that the outdoor condenser temperature remains less than the preset temperature threshold during the defrosting period, and the difference between the average value of the first outlet water temperature and the average value of the second outlet water temperature is less than the preset fifth temperature difference threshold. The fifth temperature difference threshold is a non-negative number.

[0084] Optionally, the preset seventh preset time period can be set to the first 60 s out of the consecutive 120 s after the defrosting starts, and the preset eighth preset time period can be set to the last 60 s out of the consecutive 120 s after the defrosting starts. The preset temperature threshold can be set to -8 °C, and the preset fifth temperature difference threshold can be set to 1 °C.

[0085] It can be understood that when an air-source heat pump operates in a low-temperature environment, the outdoor condenser (which is an evaporator in the heating mode) may frost, reducing the heat exchange efficiency. For this reason, the heat pump will enter the defrosting state and switch to the refrigeration mode through a four-way valve. At this time, the refrigerant absorbs heat from the indoor side and then flows to the outdoor condenser, releasing heat to melt the frost layer. Under normal circumstances, the temperature of the outdoor condenser should gradually increase, and the frost layer will gradually melt. At the same time, due to heat absorption on the indoor side, the outlet water temperature will gradually decrease.

[0086] Once in the defrosting state, if it is satisfied that the temperature of the outdoor condenser continuously remains lower than the preset temperature threshold during the defrosting period, it indicates that the defrosting effect is poor, and it may be due to the failure of the four-way valve to switch, resulting in the refrigerant not flowing to the outdoor condenser. And if it is satisfied that the temperature difference between the first average outlet water temperature and the second average outlet water temperature is less than the preset fifth temperature difference threshold, it indicates that the system has not entered the refrigeration mode, and the decrease in the outlet water temperature is not obvious, further corroborating the possibility of an abnormality in the four-way valve. In fact, if the preset operating parameters meet the preset third abnormal operating condition, the current actual operating state of the heat pump unit is closer to the heating state rather than the defrosting state of the theoretical operating state. Therefore, in this embodiment, when the preset third abnormal operating condition is met, it is determined that the four-way valve of the heat pump unit is operating abnormally.

[0087] In the above embodiment, by monitoring the change trends of the temperature of the outdoor condenser and the outlet water temperature, simple and effective abnormal judgment conditions are designed. When the temperature of the outdoor condenser remains continuously low and the decrease in the outlet water temperature is not obvious, it indicates that the defrosting process is abnormal, and it is determined that the four-way valve of the heat pump unit is operating abnormally. This method can timely detect problems, protect the equipment, and ensure the stable operation of the air-source heat pump system.

[0088] In some embodiments of the present application, steps S101a and S102a, or steps S101b and S102b, or steps S101c and S102c can be selectively executed according to the actual acquisition situation of the parameters. Of course, steps S101a and S102a, steps S101b and S102b, and steps S101c and S102c can also be executed together. The specific execution method can be synchronous execution or sequential execution according to a preset order.

[0089] To facilitate better implementation of the four-way valve abnormality detection method of the present application, the present application also provides a four-way valve abnormality detection device based on the above four-way valve abnormality detection method. The meanings of the terms are the same as those in the above four-way valve abnormality detection method, and the specific implementation details can be referred to the descriptions in the method embodiments.

[0090] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the four-way valve abnormality detection device provided by the embodiments of the present application, and specifically may include:

[0091] A parameter acquisition module 201, configured to determine the theoretical operating state of the heat pump unit and acquire the preset operating parameters corresponding to the theoretical operating state;

[0092] An abnormality detection module 202, configured to determine that the four-way valve of the heat pump unit operates abnormally if the preset operating parameters meet the preset abnormal operating conditions.

[0093] For the above four-way valve abnormality detection device, the parameter acquisition module 201 is used to detect the key operating parameters of the heat pump unit in the theoretical operating state, and the abnormality detection module 202 is used to compare these parameters with the preset abnormal operating conditions, which can timely detect the abnormal operation of the four-way valve and greatly improve the stability and reliability of the equipment.

[0094] In some embodiments of the present application, when the theoretical operating state is the heating state, acquiring the preset operating parameters corresponding to the theoretical operating state includes:

[0095] Acquiring the temperature difference between the inlet and outlet water in a preset first time period, and acquiring the average value of the first inlet water temperature in a preset second time period, and acquiring the average value of the second inlet water temperature in a preset third time period; wherein, the third time period is after the second time period;

[0096] If the preset operating parameters meet the preset abnormal operating conditions, determining that the four-way valve of the heat pump unit operates abnormally includes:

[0097] If the preset operating parameters meet the preset first abnormal operating conditions, determining that the four-way valve of the heat pump unit operates abnormally; wherein, the first abnormal operating conditions are that the temperature difference between the inlet and outlet water continuously is greater than or equal to a preset first temperature difference threshold in the first time period, and the temperature difference between the average value of the first inlet water temperature and the average value of the second inlet water temperature is greater than a preset second temperature difference threshold, and the first temperature difference threshold and the second temperature difference threshold are non-negative numbers.

[0098] In some embodiments of the present application, when the theoretical operating state is the heating state, acquiring the preset operating parameters corresponding to the theoretical operating state includes:

[0099] Obtain the temperature difference between the suction and discharge temperatures within a preset fourth time period, obtain the average value of the third inlet water temperature within a preset fifth time period, and obtain the average value of the fourth inlet water temperature within a preset sixth time period; wherein, the sixth time period is after the fifth time period.

[0100] If the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally, including:

[0101] If the preset operating parameters meet the preset second abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally; wherein, the second abnormal operating conditions are that the temperature difference between the suction and discharge temperatures continuously remains less than or equal to a preset third temperature difference threshold within the fourth time period, and the temperature difference between the average value of the third inlet water temperature and the average value of the fourth inlet water temperature is greater than a preset fourth temperature difference threshold, and the third temperature difference threshold and the fourth temperature difference threshold are non-negative numbers.

[0102] In some embodiments of the present application, when the theoretical operating state is the defrosting state, obtain the preset operating parameters corresponding to the theoretical operating state, including:

[0103] Obtain the outdoor condenser temperature during the defrosting period, obtain the average value of the first outlet water temperature within a preset seventh preset time period, and obtain the average value of the second outlet water temperature within a preset eighth preset time period; wherein, the eighth preset time period is after the seventh preset time period.

[0104] If the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally, including:

[0105] If the preset operating parameters meet the preset third abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally; wherein, the third abnormal operating conditions are that the outdoor condenser temperature continuously remains less than a preset temperature threshold during the defrosting period, and the temperature difference between the average value of the first outlet water temperature and the average value of the second outlet water temperature is less than a preset fifth temperature difference threshold, and the fifth temperature difference threshold is a non-negative number.

[0106] In some embodiments of the present application, determine the theoretical operating state of the heat pump unit, including:

[0107] When the heat pump unit operates in the heating mode for a preset first duration, and the current compressor frequency of the heat pump unit is greater than or equal to a preset first frequency threshold, determine that the theoretical operating state is the heating state.

[0108] In some embodiments of the present application, determine the theoretical operating state of the heat pump unit, including:

[0109] When the heat pump unit exits the defrosting mode for a preset second duration, and the current compressor frequency of the heat pump unit is greater than or equal to a preset second frequency threshold, determine that the theoretical operating state is the heating state.

[0110] In some embodiments of the present application, determining the theoretical operating state of the heat pump unit includes:

[0111] When the heat pump unit enters the defrosting mode and the compressor frequency of the heat pump unit is greater than or equal to a preset third frequency threshold for a third duration, determine that the theoretical operating state is the defrosting state.

[0112] In addition, the present application also provides a terminal device, as Figure 3 shown, which shows a schematic structural diagram of the terminal device involved in the present application. Specifically:

[0113] The terminal device may include a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, an input unit 304, and other components. Those skilled in the art can understand that Figure 3 the structural diagram of the terminal device shown in does not constitute a limitation on the terminal device, and it may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0114] Among them:

[0115] The processor 301 is the control center of the terminal device, connecting various parts of the entire terminal device through various interfaces and lines. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the terminal device and processes data, thereby monitoring the terminal device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modulation and demodulation processor. Among them, the application processor mainly processes the operating system, user interface, application programs, etc., and the modulation and demodulation processor mainly processes wireless communication. It can be understood that the above modulation and demodulation processor may not be integrated into the processor 301 either.

[0116] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and data processing by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required for at least one function, etc.; the data storage area can store data created according to the use of the terminal device. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0117] The terminal device further includes a power supply 303 for powering each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so as to manage functions such as charging, discharging, and power consumption management through the power management system. The power supply 303 may further include any components such as one or more DC or AC power supplies, a recharge system, a power device debugging circuit, a power converter or inverter, and a power status indicator.

[0118] The terminal device may further include an input unit 304, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0119] Although not shown, the terminal device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, the processor 301 in the terminal device will, according to the following instructions, load the executable files corresponding to the processes of one or more application programs into the memory 302, and the processor 301 will run the application programs stored in the memory 302, so as to implement the steps in any of the four-way valve abnormality detection methods provided in the embodiments of the present application: determine the theoretical operating state of the heat pump unit, and obtain the preset operating parameters corresponding to the theoretical operating state; if the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally.

[0120] The above device can timely detect the abnormal operation of the four-way valve by detecting the key operating parameters of the heat pump unit in the theoretical operating state and comparing these parameters with the preset abnormal operating conditions, greatly improving the stability and reliability of the device.

[0121] For the specific implementation of each of the above operations, reference can be made to the previous embodiments, which will not be elaborated here.

[0122] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructions, or by controlling related hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0123] Therefore, the present application provides a computer-readable storage medium, on which a computer program is stored. The computer program can be loaded by a processor to execute the steps in any of the four-way valve abnormality detection methods provided by the present application.

[0124] For the specific implementation of each of the above operations, reference can be made to the previous embodiments, which will not be elaborated here.

[0125] Among them, the computer-readable storage medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc.

[0126] Since the instructions stored in the computer-readable storage medium can execute the steps in any of the four-way valve abnormality detection methods provided by this application, the beneficial effects achievable by any of the four-way valve abnormality detection methods provided by this application can be achieved. For details, refer to the previous embodiments and will not be elaborated here.

[0127] The above has introduced in detail a four-way valve abnormality detection method, device, terminal device, and computer-readable storage medium provided by this application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A four-way valve abnormality detection method, characterized in that: Applied to a heat pump unit, the method comprises: Determining a theoretical operating state of the heat pump unit, and obtaining preset operating parameters corresponding to the theoretical operating state; If the preset operating parameters meet the preset abnormal operating conditions, it is determined that the four-way valve of the heat pump unit operates abnormally.

2. The four-way valve abnormality detection method according to claim 1, characterized in that: When the theoretical operating state is a heating state, the obtaining of preset operating parameters corresponding to the theoretical operating state includes: Obtaining the inlet and outlet water temperature difference within a preset first time period, obtaining the first inlet water temperature average within a preset second time period, and obtaining the second inlet water temperature average within a preset third time period; wherein the third time period is after the second time period; If the preset operating parameters meet the preset abnormal operating conditions, determining that the four-way valve of the heat pump unit is operating abnormally includes: If the preset operating parameters meet the preset first abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally; wherein, the first abnormal operating condition is that the inlet and outlet water temperature difference is continuously greater than or equal to the preset first temperature difference threshold value during the first time period, and the temperature difference between the first inlet water temperature average and the second inlet water temperature average is greater than the preset second temperature difference threshold value, and the first temperature difference threshold value and the second temperature difference threshold value are non-negative numbers.

3. The four-way valve abnormality detection method according to claim 1, characterized in that: When the theoretical operating state is a heating state, the obtaining of preset operating parameters corresponding to the theoretical operating state includes: Obtaining the intake and exhaust temperature difference within a preset fourth time period, obtaining the third average value of the water inlet temperature within a preset fifth time period, and obtaining the fourth average value of the water inlet temperature within a preset sixth time period; wherein the sixth time period is after the fifth time period; If the preset operating parameters meet the preset abnormal operating conditions, determining that the four-way valve of the heat pump unit is operating abnormally includes: If the preset operating parameters meet the preset second abnormal operating conditions, it is determined that the four-way valve of the heat pump unit is operating abnormally; wherein, the second abnormal operating condition is that the intake and exhaust temperature difference is continuously less than or equal to the preset third temperature difference threshold value during the fourth time period, and the temperature difference between the third water inlet temperature average and the fourth water inlet temperature average is greater than the preset fourth temperature difference threshold value, and the third temperature difference threshold value and the fourth temperature difference threshold value are non-negative numbers.

4. The four-way valve abnormality detection method according to claim 1, characterized in that: When the theoretical operating state is a defrosting state, the obtaining of preset operating parameters corresponding to the theoretical operating state includes: Obtaining the outdoor condenser temperature during the defrosting period, obtaining the first average water outlet temperature during a preset seventh preset time period, and obtaining the second average water outlet temperature during a preset eighth preset time period; wherein the eighth preset time period is after the seventh preset time period; If the preset operating parameters meet the preset abnormal operating conditions, determining that the four-way valve of the heat pump unit is operating abnormally includes: If the preset operating parameters meet the preset third abnormal operating conditions, the four-way valve of the heat pump unit is determined to be operating abnormally; wherein, the third abnormal operating condition is that the outdoor condenser temperature is continuously lower than the preset temperature threshold during the defrost period, and the temperature difference between the first average water outlet temperature and the second average water outlet temperature is lower than the preset fifth temperature difference threshold, and the fifth temperature difference threshold is a non-negative number.

5. The four-way valve abnormality detection method according to claim 1, characterized in that: Determining the theoretical operating state of the heat pump unit includes: When the heat pump unit operates in the heating mode for a preset first time period and the current compressor frequency of the heat pump unit is greater than or equal to a preset first frequency threshold, it is determined that the theoretical operating state is the heating state.

6. The four-way valve abnormality detection method according to claim 1, characterized in that: Determining the theoretical operating state of the heat pump unit includes: When the heat pump unit exits the defrost mode for a preset second time period and the current compressor frequency of the heat pump unit is greater than or equal to a preset second frequency threshold, it is determined that the theoretical operating state is a heating state.

7. The four-way valve abnormality detection method according to claim 1, characterized in that: Determining the theoretical operating state of the heat pump unit includes: When the heat pump unit enters the defrost mode and the compressor frequency of the heat pump unit is greater than or equal to a preset third frequency threshold for a third period of time, it is determined that the theoretical operating state is the defrost state.

8. A four-way valve abnormality detection device, characterized in that: Applied to a heat pump unit, the four-way valve abnormality detection device comprises: A parameter acquisition module, used to determine the theoretical operating state of the heat pump unit and obtain preset operating parameters corresponding to the theoretical operating state; The abnormality detection module is used to determine that the four-way valve of the heat pump unit is operating abnormally if the preset operating parameters meet the preset abnormal operating conditions.

9. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 7.

10. A terminal device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 7.

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