Fault detection method, device and equipment for heat pump hot water equipment and storage medium

Abstract

The invention belongs to the technical field of electric appliances, and particularly relates to a heat pump hot water equipment fault detection method, device and equipment and a storage medium, the method comprises the steps that theoretical heating duration corresponding to a test water temperature interval is obtained according to the environment temperature, and at least one test water temperature interval is included between the initial water temperature and the target heating water temperature of a water tank; when the water temperature in the water tank reaches the lower limit temperature of the test water temperature interval, the actual heating water temperature in the water tank after the compressor operates for the theoretical heating duration is obtained; if the difference value between the upper limit temperature of the test water temperature interval and the actual heating water temperature is larger than the preset temperature threshold value, it is determined that the heat pump hot water equipment breaks down, and therefore the heat pump hot water equipment can be automatically detected in each operation process of heat pump hot water without adding an additional sensor; the timeliness of fault discovery of the heat pump hot water equipment is greatly improved.

Description

Technical Field

[0001] This application belongs to the technical field of electrical appliances, and particularly relates to a method, device, equipment and storage medium for detecting faults in heat pump water heaters. Background Art

[0002] Heat pump water heaters use refrigerants to absorb low-grade heat energy in the environment, and transfer this part of heat energy to the water in the water tank through a heat exchanger in the heat pump cycle to produce hot water. Compared with electric water heaters and gas water heaters, they can effectively reduce energy consumption and are favored by more and more families.

[0003] With the long-term use of heat pump water heaters, various faults will inevitably occur. At present, the fault determination of heat pump water heaters generally relies on various sensors carried by the machine itself. Although this method can also detect the operation faults of heat pump water heaters, it often needs to be detected when the values detected by the sensors deviate greatly, making it difficult to timely handle the faults of heat pump water heaters, affecting the stability and reliability of the operation of heat pump water heaters. Summary of the Invention

[0004] This application provides a method, device, equipment and storage medium for detecting faults in heat pump water heaters to solve the problem that the existing heat pump water heaters rely on the sensors carried by themselves for fault detection, making it difficult to timely handle the faults when the heat pump water heaters break down, affecting the stability and reliability of the operation.

[0005] The first aspect of this application provides a method for detecting faults in heat pump water heaters, including:

[0006] Obtain the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature, and at least one of the test water temperature ranges is included between the initial water temperature and the target heating water temperature of the water tank;

[0007] Since the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, obtain the actual heating water temperature in the water tank after the compressor operates for the theoretical heating duration;

[0008] If the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than a preset temperature threshold, it is determined that the heat pump water heater has a fault.

[0009] In a possible design, before obtaining the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature, it further includes:

[0010] Match at least one target water temperature range from a preset plurality of continuous water temperature ranges according to the initial water temperature and the target heating water temperature;

[0011] Determine at least one of the target water temperature ranges as one of the test water temperature ranges.

[0012] In one possible design, the obtaining the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature includes:

[0013] For each of the target water temperature ranges, obtain a target correspondence from a preset correspondence between the frequency values of multiple compressors and the heating time according to the ambient temperature;

[0014] Obtain the theoretical heating duration according to the actual operating frequency of the compressor and the target correspondence.

[0015] In one possible design, the obtaining the target correspondence from a preset correspondence between the frequency values of multiple compressors and the heating time according to the ambient temperature includes:

[0016] Match a corresponding target ambient temperature range from a preset multiple continuous ambient temperature ranges according to the ambient temperature;

[0017] Obtain the target correspondence from a preset correspondence between the frequency values of multiple compressors and the heating time according to the ambient temperature range.

[0018] In one possible design, the establishment of the correspondence between the frequency value of the compressor and the heating time includes:

[0019] Under the same test conditions, for each of the ambient temperature ranges, make the compressor operate at the test frequency value, and heat the water temperature in the water tank from the lower limit temperature of each water temperature range to the upper limit temperature of the water temperature range, to obtain the test heating duration corresponding to the test frequency value, where each water temperature range corresponds to multiple test frequency values;

[0020] Obtain the correspondence corresponding to each water temperature range in different ambient temperature ranges through the test frequency value and the test heating duration.

[0021] In one possible design, the method further includes:

[0022] Obtain the system parameters of the heat pump water heater, and perform fault analysis according to the system parameters to generate a warning message;

[0023] Send the warning message to at least one of the terminal device and the cloud server for fault warning.

[0024] In one possible design, the system parameters at least include the suction temperature and the discharge temperature of the compressor.

[0025] The second aspect of the present application provides a fault detection device for a heat pump water heater, including:

[0026] An acquisition module, which is used to acquire the initial water temperature, target heating water temperature and ambient temperature of the water tank;

[0027] A processing module, which is used to obtain the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature, and at least one of the test water temperature ranges is included between the initial water temperature and the target heating water temperature of the water tank; the processing module is further used to start from the moment when the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, and obtain the actual heating water temperature in the water tank after the compressor runs for the theoretical heating duration. If the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than a preset temperature threshold, it is determined that the heat pump water heater has a fault.

[0028] The third aspect of the present application provides a fault detection device for a heat pump water heater, including a processor and a memory;

[0029] Wherein, the memory stores computer-executable instructions;

[0030] When the processor runs the computer-executable instructions stored in the memory, it is used to implement the fault detection method for the heat pump water heater as described in the first aspect above.

[0031] The fourth aspect of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed, they are used to implement the fault detection method for the heat pump water heater as described in the first aspect.

[0032] The fault detection method, device, equipment and storage medium for the heat pump water heater provided by the present application first obtain the theoretical heating duration corresponding to the test water temperature range through the ambient temperature. When the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, start to record the running duration of the compressor until the running duration of the compressor is equal to the theoretical heating duration, and then obtain the actual heating water temperature of the water tank. At this time, compare the actual heating water temperature with the upper limit temperature of the test water temperature range. If the difference between the two is greater than a preset temperature threshold, it can be determined that the heat pump water heater has a fault. The test water temperature range is a temperature segment between the initial water temperature and the target heating water temperature of the water tank, which enables the running state of the heat pump water heater to be detected every time the heat pump water heater runs, so that the abnormal conditions of the heat pump water heater can be found in time to notify the user or the manufacturer to carry out maintenance in time, avoid major problems, and effectively improve the stability and reliability of the operation of the heat pump water heater. In addition, while improving the detection timeliness, the present application does not require additional sensors and does not increase the use cost of the heat pump water heater. Description of the Drawings

[0033] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0034] Figure 1 Flow schematic of the method for detecting faults in a heat pump water heater provided by an embodiment of this application Figure 1 ;

[0035] Figure 2 Flow schematic of the method for detecting faults in a heat pump water heater provided by an embodiment of this application Figure 2 ;

[0036] Figure 3 Flow schematic diagram of the method for establishing the correspondence between frequency values and heating durations provided by an embodiment of this application;

[0037] Figure 4 Structural schematic diagram of the device for detecting faults in a heat pump water heater provided by an embodiment of this application;

[0038] Figure 5 Structural schematic diagram of the equipment for detecting faults in a heat pump water heater provided by an embodiment of this application.

[0039] Through the above accompanying drawings, clear embodiments of this application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts shall fall within the scope of protection of this application.

[0041] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this invention and the above accompanying drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this invention described herein can be implemented, for example, in an order different from those illustrated or described herein.

[0042] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0043] Currently, heat pump water heating equipment generally relies on sensors carried by the equipment itself to monitor the operating status of the heat pump water heating equipment. Only when the data detected by the sensors deviates significantly from the normal data can it be discovered. At this time, the faults of the heat pump water heating equipment are generally relatively serious. Not only will the maintenance cost increase, but also before that, a series of problems may have occurred in the heat pump water heating equipment, affecting the stability and reliability of the use of the heat pump water heating equipment, and greatly reducing the user experience.

[0044] Previously, the applicant also considered adding some additional sensors to the heat pump water heating equipment for dedicated fault detection to improve the timeliness of fault discovery. However, on the one hand, adding additional sensors will increase the volume of the heat pump water heating equipment, and on the other hand, adding additional sensors will also increase the use cost of the heat pump water heating equipment.

[0045] Accordingly, the present application provides a new method for detecting faults in heat pump water heating equipment, which can effectively avoid the above problems. It correlates the operating conditions of the heat pump water heating equipment through the hot water heating situation that directly affects the user experience. Each time the heat pump water heating equipment operates, it can automatically detect. It can not only effectively improve the timeliness of fault discovery so that users and manufacturers can perform maintenance when there are small problems, but also does not require additional sensors and will not increase the use cost of the heat pump water heating equipment.

[0046] The following will specifically describe the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems with specific embodiments. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0047] Please refer to Figure 1 As shown, this embodiment provides a method for detecting faults in heat pump water heating equipment, which is mainly aimed at heat pump water heating equipment with the ability to store hot water, such as heat pump water heaters and heat pump heaters, etc. For the sake of easy understanding, the container for storing hot water in the heat pump water heating equipment will be uniformly named as a water tank in the following. Of course, the heat pump water heating equipment applying this embodiment generally also includes components such as a compressor, an evaporator, a heat exchanger, and an expansion valve. Specifically, the fault detection method includes the following steps:

[0048] S101. Obtain the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature;

[0049] Specifically, the test water temperature range is a temperature segment between the initial water temperature of the water tank and the target heating water temperature. That is, when the heat pump water heater heats the water in the water tank to the target heating water temperature, it will necessarily pass through the test water temperature range.

[0050] Among them, one or more test water temperature ranges can be preset or selected according to certain rules between the initial water temperature and the target heating water temperature. Of course, a theoretical heating duration must be obtained corresponding to each test water temperature range.

[0051] The theoretical heating duration is the operating duration that theoretically takes to heat the water temperature in the water tank from the lower limit temperature of the test water temperature range to the upper limit temperature of the test water temperature range under the current conditions. It can be preset in advance according to the corresponding test water temperature range, or calculated according to certain rules.

[0052] S102. Since the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, obtain the actual heating water temperature in the water tank after the theoretical heating duration of the compressor operation;

[0053] Specifically, during the operation of the heat pump water heater, the real-time water temperature in the water tank can be continuously obtained through the built-in temperature sensor. When the real-time water temperature is equal to the lower limit temperature of the test water temperature range, it can be determined that the test water temperature range has been reached at this time. Starting from this time, record the operation duration of the compressor. When the recorded operation duration is equal to the theoretical heating duration, the water temperature in the water tank is the actual heating water temperature.

[0054] S103. If the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than the preset temperature threshold, it is determined that the heat pump water heater has a fault.

[0055] Specifically, the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature represents the value obtained by subtracting the actual heating water temperature from the upper limit temperature of the test water temperature range.

[0056] When the heat pump water heater is operating normally, under the same conditions, the difference between its heating capacity and the theoretical heating capacity should be maintained within a certain range. Once the heating capacity drops too much, there must be an abnormal state of some components of the heat pump water heater.

[0057] The most intuitive reaction of the heating capacity change is the change in the water temperature in the water tank. In this embodiment, the theoretical heating duration corresponding to the test water temperature range is first determined based on the ambient temperature. Then, during the operation of the heat pump water heater, when the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, timing starts. After the heat pump water heater operates for the theoretical heating duration, the actual heated water temperature in the water tank is directly compared with the upper limit temperature of the test water temperature range. As long as the difference between the two is less than or equal to the preset temperature threshold, it indicates that the hot water production capacity of the heat pump water heater is normal and no fault occurs. If the difference between the two is greater than the preset temperature threshold, it indicates that the deviation degree of the actual heated water temperature is relatively large, which has affected the normal use of users, and there is a fault in the heat pump water heater.

[0058] The fault detection method of this embodiment can be automatically detected every time the heat pump hot water runs. When a fault occurs in the heat pump water heater, it can be detected in time, which can avoid major problems of the heat pump water heater to a certain extent. It can not only improve the user experience but also help reduce the maintenance cost of the heat pump water heater.

[0059] Please refer to Figure 2 As shown, based on the above embodiment, the fault detection method of the heat pump water heater provided in this embodiment includes the following steps:

[0060] S201. Match at least one target water temperature range from a plurality of preset continuous water temperature ranges according to the initial water temperature and the target heating water temperature;

[0061] Specifically, the initial water temperature of the water tank can be obtained at least in the following ways:

[0062] First, install a temperature sensor on the water inlet side of the water tank, and use the water temperature detected by the water inlet side temperature sensor as the initial water temperature of the water tank.

[0063] Second, install a temperature sensor at each of the water inlet and outlet of the water tank, and use the average value of the water temperatures detected by the two sensors as the initial water temperature of the water tank.

[0064] Among them, the method for determining the range of the test water temperature range at least includes the following:

[0065] Match at least one target water temperature range from a plurality of preset continuous water temperature ranges according to the initial water temperature and the target heating water temperature, and determine at least one target water temperature range as a test water temperature range, that is, each test water temperature range can be composed of one target water temperature range or multiple continuous target water temperature ranges, as long as the target water temperature range is completely between the initial water temperature and the target heating water temperature.

[0066] Among them, when dividing the preset water temperature range, it can be divided according to any temperature interval within the heating water temperature range of the heat pump water heater.

[0067] Exemplarily, the water temperature range is divided by the same water temperature interval. Specifically, the heating water temperature range is evenly divided into multiple water temperature intervals with the same difference between the upper limit temperature and the lower limit temperature.

[0068] Exemplarily, the water temperature range is divided by multiple different water temperature intervals. Specifically, among all the water temperature intervals, there are at least two water temperature intervals with different differences between the upper limit temperature and the lower limit temperature.

[0069] S202. Obtain the theoretical heating duration corresponding to the test water temperature interval according to the ambient temperature;

[0070] Specifically, the theoretical heating duration can be obtained at least in the following two ways:

[0071] First, when the compressor frequency remains unchanged, in each water temperature interval, a plurality of theoretical heating durations corresponding to different ambient temperatures are preset. After determining the target water temperature interval corresponding to the test water temperature interval, the corresponding theoretical heating duration can be directly selected according to the ambient temperature.

[0072] Second, when the compressor frequency is uncertain, in each water temperature interval, a plurality of corresponding relationships with the ambient temperature are preset, where the corresponding relationship is used to characterize the relationship between the operating frequency of the compressor and the heating time. After determining the target corresponding relationship corresponding to the test water temperature interval according to the ambient temperature, and then according to the operating frequency of the compressor at this time, the theoretical heating duration is obtained through the target corresponding relationship.

[0073] In this way, the theoretical heating duration can be predicted more accurately according to the actual operating conditions of the heat pump water heater, improving the fault detection effect.

[0074] Among them, the ambient temperature mentioned in the second way can be understood at least in the following two ways:

[0075] First, the ambient temperature here represents all the ambient temperature values allowed for the operation of the heat pump water heater.

[0076] Second, the ambient temperature here refers to the ambient temperature range. Specifically, all the ambient temperature ranges allowed for the operation of all heat pump water heaters can be divided into multiple continuous ambient temperature ranges, and each ambient temperature range is the ambient temperature mentioned here.

[0077] When the difference in ambient temperature is small, its impact on the energy efficiency ratio of the heat pump water heater is small. Therefore, multiple ambient temperature ranges can be preset, and the corresponding relationship corresponding to each water temperature interval is determined for each ambient temperature range to reduce the data processing volume and improve the response speed.

[0078] That is, in each water temperature range, multiple corresponding relationships for different ambient temperature ranges are preset first. When obtaining the theoretical heating duration corresponding to the test water temperature range, first determine the ambient temperature range to which it belongs according to the detected actual ambient temperature value, then match the corresponding target corresponding relationship according to the ambient temperature range, and finally obtain the theoretical heating duration based on the actual operating frequency of the compressor and the target corresponding relationship.

[0079] S203. After the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, obtain the actual heating water temperature in the water tank after obtaining the theoretical heating duration of the compressor operation;

[0080] S204. Determine whether the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than the preset water temperature threshold;

[0081] Specifically, if the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is less than or equal to the preset water temperature threshold, it indicates that the hot water production capacity of the heat pump water heater is normal and there is no fault, and the detection can be ended.

[0082] If the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than the preset water temperature threshold, it indicates that the hot water production capacity of the heat pump water heater is insufficient, which will affect the normal use and requires maintenance. At this time, jump to step S205.

[0083] S205. If it is greater than the preset water temperature threshold, obtain the system parameters of the heat pump water heater, and generate a warning message according to the system parameters for fault analysis;

[0084] Specifically, when the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than the preset water temperature threshold, it can be determined that the heat pump water heater has a fault, but it is difficult to determine the cause of the fault based on this data alone. For the convenience of troubleshooting and maintenance, the system parameters of the heat pump water heater can be obtained at this time to analyze and investigate the possible causes of the fault.

[0085] Among them, the system parameters should at least include the exhaust temperature and suction temperature of the compressor. Of course, other system parameters of the heat pump water heater can also be included, as long as they can assist in judging the cause of the fault of the heat pump water heater.

[0086] Exemplarily, if the suction temperature is relatively low compared to the normal value, it can be analyzed that the cause of the fault is dirty blockage of the evaporator or refrigerant leakage.

[0087] Exemplarily, if both the suction temperature and the exhaust temperature are relatively high compared to the normal value, it is judged that the cause of the fault may be refrigerant leakage, and the manufacturer needs to be notified for troubleshooting.

[0088] Exemplarily, if both the suction temperature and the exhaust temperature are relatively lower than the normal values, it is determined that the possible cause of the failure may be the blockage of the evaporator, and the user can first check whether the evaporator has poor ventilation by himself / herself.

[0089] Thus, different values of system parameters can be combined to predict possible causes of failures, and the data and possible causes of failures can be integrated to form a warning message.

[0090] S206. Send the warning message to at least one of the terminal device and the cloud server for failure warning.

[0091] Specifically, after the warning message is generated, users and manufacturers can be notified through terminal devices, servers, etc., so that they can discover the anomalies of the heat pump water heater and determine the maintenance method according to the content of the warning message. For some minor problems, users can handle them by themselves to reduce the maintenance cost. For some problems that users cannot handle, the manufacturer can promptly dispatch staff to the site for inspection and maintenance to improve the timeliness of failure handling, thereby further enhancing the user experience.

[0092] Please refer to Figure 3 as shown, the corresponding relationship between the frequency value of the compressor and the heating time can be established in the following manner:

[0093] S301. Divide the allowable operating ambient temperature range of the heat pump water heater into multiple consecutive ambient temperature intervals;

[0094] Divide the heating water temperature range formed by the lowest allowable water inlet temperature and the highest water outlet temperature of the water tank of the heat pump water heater into multiple consecutive water temperature intervals;

[0095] Set multiple test frequency values corresponding to each water temperature interval within the operable frequency range of the compressor;

[0096] S302. Corresponding to each ambient temperature interval, make the compressor operate at the test frequency value, heat the water temperature from the lower limit temperature of each temperature interval to the upper limit temperature, and obtain the test heating duration;

[0097] Specifically, under the same test conditions and keeping the ambient temperature during the test within the same ambient temperature interval, make the compressor operate at the test frequency value within each water temperature interval, and measure the test heating duration corresponding to all test frequency values in each temperature interval.

[0098] S303. Fit the corresponding relationship between each temperature interval within each ambient temperature interval through the test frequency value and the test heating duration.

[0099] Specifically, the methods of fitting the corresponding relationship between each temperature interval within each ambient temperature interval through the test frequency value and the test heating duration include at least the following several types:

[0100] First, the test frequency value and the test heating duration are fitted by polynomial interpolation to obtain an equation representing the relationship between the frequency value and the heating duration as the corresponding relationship.

[0101] Exemplarily, the corresponding relationship is: H = ax 2 + bx + c;

[0102] where x represents the frequency value of the compressor operation, and H represents the heating duration.

[0103] Of course, the above two equations are only examples. During actual fitting, the number of iterations can be determined according to the fitting situation.

[0104] Second, the test frequency value and the test heating duration are used as samples to train a random forest model to obtain the corresponding relationship for predicting the heating duration based on the frequency value.

[0105] Third, the test frequency value and the test heating duration are used as samples to train a neural network model to obtain the corresponding relationship between the frequency value and the heating duration.

[0106] Of course, other algorithm models can also be used to predict the heating duration based on the frequency value. The above several are only examples for illustration and are not limitations on determining the corresponding relationship.

[0107] Please refer to Figure 4 As shown, the embodiment of the present application further provides a heat pump water heater fault detection device 400, which includes an acquisition module 410 and a processing module 420.

[0108] The acquisition module 410 is used to acquire the initial water temperature, the target heating water temperature, and the ambient temperature of the water tank. The processing module 420 is used to obtain the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature during the operation of the heat pump water heater. The processing module 420 is further used to acquire the actual heating water temperature in the water tank after obtaining the theoretical heating duration of the compressor operation since the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, and determine that the heat pump water heater has a fault when the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than a preset temperature threshold.

[0109] In some possible implementation manners, the processing module 420 is further used to match at least one target water temperature range from a plurality of preset continuous water temperature ranges according to the initial water temperature and the target heating water temperature, and determine at least one target water temperature range as a test water temperature range.

[0110] In some possible embodiments, the processing module 420 is further configured to, for each target water temperature range, obtain a target correspondence relationship from a preset correspondence relationship between the frequency values and heating times of a plurality of compressors according to the ambient temperature, and obtain a theoretical heating duration according to the actual operating frequency of the compressor and the target correspondence relationship.

[0111] In some possible embodiments, the processing module 420 is further configured to, after determining that a heat pump water heater fails, obtain system parameters of the heat pump water heater, perform fault analysis based on the system parameters to generate a warning message, and send the warning message to one of a terminal device and a cloud server for fault warning.

[0112] Of course, it can be understood that the heat pump water heater fault detection device in this embodiment is used to implement the above-mentioned heat pump water heater fault detection method, and its specific control logic is the same as that in the above embodiment, and will not be elaborated here.

[0113] Please refer to Figure 5 As shown, the embodiment of the present application further provides a heat pump water heater fault detection device 500, which includes a processor 520 and a memory 510.

[0114] Among them, the memory 510 is used to store computer execution instructions, and the processor 520 executes the computer execution instructions stored in the memory 510 to implement the heat pump water heater fault detection method in the above embodiment.

[0115] Among them, the memory 510 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0116] The processor 520 may be a central processing unit (CPU for short), or an application specific integrated circuit (ASIC for short), or one or more integrated circuits configured to implement the embodiments of the present application.

[0117] The heat pump hot water fault detection device 500 of this embodiment may further include a communication interface for information interaction. In specific implementation, if the communication interface, the memory 510, and the processor 520 are implemented independently, the communication interface, the memory 510, and the processor 520 may be interconnected through a bus and communicate with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc., but it does not mean that there is only one bus or one type of bus.

[0118] If the communication interface, the memory 510, and the processor 520 are integrated on a chip for implementation, the communication interface, the memory 510, and the processor 520 may complete communication through an internal interface.

[0119] The embodiment of the present application also provides a computer-readable storage medium, which may include various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc. The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the heat pump hot water device fault detection method in the above embodiment.

[0120] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting faults in a heat pump water heater, characterized in that, Including: Obtain the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature, wherein at least one of the test water temperature ranges is included between the initial water temperature and the target heating water temperature of the water tank; Since the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, obtain the actual heating water temperature in the water tank after the compressor operates for the theoretical heating duration; If the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than a preset temperature threshold, it is determined that the heat pump water heater has a fault.

2. The method for detecting faults in a heat pump water heater according to claim 1, characterized in that, Before obtaining the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature, it further includes: Match at least one target water temperature range from a plurality of preset consecutive water temperature ranges according to the initial water temperature and the target heating water temperature; Determine at least one of the target water temperature ranges as one of the test water temperature ranges.

3. The method for detecting faults in a heat pump water heater according to claim 2, characterized in that, Obtaining the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature includes: For each of the target water temperature ranges, obtain a target correspondence relationship from a plurality of preset correspondence relationships between the frequency values of the compressor and the heating time according to the ambient temperature; Obtain the theoretical heating duration according to the actual operating frequency of the compressor and the target correspondence relationship.

4. The method for detecting faults in a heat pump water heater according to claim 3, characterized in that, Obtaining the target correspondence relationship from a plurality of preset correspondence relationships between the frequency values of the compressor and the heating time according to the ambient temperature includes: Match a corresponding target ambient temperature range from a plurality of preset consecutive ambient temperature ranges according to the ambient temperature; Obtain the target correspondence relationship from a plurality of preset correspondence relationships between the frequency values of the compressor and the heating time according to the ambient temperature range.

5. The method for detecting faults in a heat pump water heater according to claim 4, characterized in that, The establishment of the correspondence relationship between the frequency value of the compressor and the heating time includes: Under the same test conditions, for each of the ambient temperature ranges, make the compressor operate at the test frequency value, and heat the water temperature in the water tank from the lower limit temperature of each water temperature range to the upper limit temperature of the water temperature range, to obtain the test heating duration corresponding to the test frequency value, wherein each water temperature range corresponds to a plurality of the test frequency values; Through the test frequency value and the test heating duration, obtain the correspondence relationship corresponding to each water temperature range in different ambient temperature ranges.

6. The method for detecting faults in a heat pump water heater according to any one of claims 1-5, characterized in that, The method further includes: Obtain the system parameters of the heat pump water heater, and perform fault analysis according to the system parameters to generate a warning message; Send the warning message to at least one of the terminal device and the cloud server for fault warning.

7. The method for detecting faults in a heat pump water heater according to claim 6, characterized in that, The system parameters at least include the suction temperature and the discharge temperature of the compressor.

8. A device for detecting faults in a heat pump water heater, characterized in that, Including: An acquisition module, which is used to acquire the initial water temperature, the target heating water temperature and the ambient temperature of the water tank; A processing module, which is configured to generate at least one test water temperature range between the initial water temperature and the target heating water temperature of the water tank, obtain the theoretical heating duration corresponding to the test water temperature range according to the ambient temperature, and since the water temperature in the water tank reaches the lower limit temperature of the test water temperature range, obtain the actual heating water temperature in the water tank after the compressor operates for the theoretical heating duration. If the difference between the upper limit temperature of the test water temperature range and the actual heating water temperature is greater than a preset temperature threshold, a fault warning is issued.

9. A device for detecting faults in a heat pump water heater, characterized in that, It includes a processor and a memory; wherein, the memory stores computer-executable instructions; When the processor runs the computer-executable instructions stored in the memory, it is configured to implement the heat pump water heater fault detection method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, Computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed, they are configured to implement the heat pump water heater fault detection method according to any one of claims 1-7.

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