Fault detection method and device of dryer, storage medium and dryer

Abstract

Embodiments of the present application provide a dryer fault detection method and device, a storage medium and a dryer. When the dryer is in a drying state, a temperature change parameter of an evaporator of the dryer is acquired. When the temperature change parameter is greater than a preset temperature change parameter, a rotating state of a motor of the dryer is acquired. If the rotating state of the motor is a reverse state, the dryer remains in the drying state. If the rotating state of the motor is a non-reverse state, it is determined that the motor is in a locked-rotor state. Whether the motor is in the locked-rotor state is determined through the temperature change parameter of the evaporator of the dryer, so that the locked-rotor operation of the motor is avoided to prevent the equipment from being damaged and the normal use of the user.

Description

Technical Field

[0001] This application belongs to the field of household appliances, and in particular relates to a fault detection method, device, storage medium and dryer for a dryer. Background Technology

[0002] As consumers have increasingly higher requirements for clothing drying, the demand for dryers is growing, leading to a greater need for heat pump dryers. In recent years, the market size of heat pump dryers has gradually expanded, and cost-effective designs have become increasingly prominent. However, the motors of heat pump dryers are prone to stalling under excessive loads. Motor stalling can lead to problems such as motor shaft breakage and drive system failure, affecting normal use by users. Summary of the Invention

[0003] This application provides a method, apparatus, storage medium, and dryer for detecting faults in a dryer, in order to solve the problem of motor stall in existing dryers.

[0004] This application provides a fault detection method for a dryer, the fault detection method comprising:

[0005] When the dryer is in drying mode, the temperature change parameters of the evaporator of the dryer are obtained;

[0006] When the temperature change parameter is greater than the preset temperature change parameter, the rotation status of the motor of the dryer is obtained;

[0007] If the motor is rotating in reverse, the dryer remains in the drying state.

[0008] If the motor is rotating in a non-reverse state, then the motor is confirmed to be in a stalled state.

[0009] Optionally, obtaining the temperature change parameters of the evaporator of the dryer includes:

[0010] The first temperature of the evaporator at a first time and the second temperature at a second time are obtained, and the slope K1 of the first temperature and the second temperature is determined, wherein the second time is later than the first time;

[0011] Determine whether the slope K1 is greater than the preset slope K0;

[0012] If the slope K1 is less than or equal to the preset slope K0, then the drying state is maintained;

[0013] If the slope K1 is greater than the preset slope K0, then the rotation state of the motor of the dryer is obtained.

[0014] Optionally, if the motor's rotation state is non-reverse, then confirming that the motor is in a stall state includes:

[0015] Obtain the third temperature of the evaporator at a third time, and determine the temperature difference T1 between the third temperature and the second temperature, wherein the third time is later than the second time;

[0016] Determine whether the temperature difference T1 between the third temperature and the second temperature is greater than or equal to a preset temperature difference Ta;

[0017] If the temperature difference T1 is less than the preset temperature difference Ta, then the drying state is maintained;

[0018] If the temperature difference T1 is greater than or equal to the preset temperature difference Ta, then the motor is confirmed to have a stall fault.

[0019] Optionally, after confirming that the motor has a stall fault if the temperature difference T1 is greater than or equal to the preset temperature difference Ta, the method further includes:

[0020] After the motor has been stopped for four hours, restart the motor and obtain the fourth temperature of the condenser at that time.

[0021] After the motor has been running for five hours, the fifth temperature of the condenser is obtained, and the difference T2 between the fifth temperature and the fourth temperature is determined. The fifth time is not less than the fourth time.

[0022] Determine whether the temperature difference T2 between the fifth temperature and the fourth temperature is greater than or equal to the preset temperature difference Tb;

[0023] If the temperature difference T2 is greater than or equal to the preset temperature difference Tb, then the drying state is maintained;

[0024] If the temperature difference T2 is less than the preset temperature difference Tb, then the motor stall fault is confirmed to have not been eliminated.

[0025] Optionally, after confirming that the motor stall fault has not been eliminated if the temperature difference T2 is less than the preset temperature difference Tb, the method further includes:

[0026] The compressor and the motor are stopped for a sixth period of time.

[0027] The motor is controlled to rotate for a seventh duration, the seventh duration being no less than the sixth duration;

[0028] Obtain the sixth temperature of the evaporator and the seventh temperature of the condenser, and determine the temperature difference T3 between the seventh temperature and the sixth temperature;

[0029] Determine whether the temperature difference T3 between the seventh temperature and the sixth temperature is less than or equal to the preset temperature difference Tc;

[0030] If the temperature difference T3 is less than or equal to the preset temperature difference Tc, the compressor is started and the drying process is maintained.

[0031] If the temperature difference T3 is greater than the preset temperature difference Tc, then it is confirmed that the motor stall fault has not been eliminated.

[0032] Optionally, if the temperature difference T3 is greater than the preset temperature difference Tc, after confirming that the motor stall fault has not been eliminated, the method further includes:

[0033] The control motor has been stopped for eight hours.

[0034] The motor is controlled to rotate for a ninth duration, the ninth duration being no less than the eighth duration;

[0035] Obtain the eighth temperature of the evaporator and the ninth temperature of the condenser, and determine the temperature difference T4 between the ninth temperature and the eighth temperature;

[0036] Determine whether the temperature difference T4 between the ninth temperature and the eighth temperature is less than or equal to the preset temperature difference Td;

[0037] If the temperature difference T4 is less than or equal to the preset temperature difference Td, then the compressor is started and the drying state is maintained.

[0038] If the temperature difference T4 is greater than the preset temperature difference Td, then after the motor is shut down for ten hours, the compressor and motor will be shut down again for six hours.

[0039] Optionally, before obtaining the temperature change parameters of the evaporator during the drying state, the method further includes:

[0040] Start the drying program;

[0041] The compressor and motor are controlled to operate, and the motor drives the drum and fan to rotate at a preset speed.

[0042] This application also provides a fault detection device for a dryer, the fault detection device comprising:

[0043] The detection module is used to acquire the temperature change parameter of the evaporator of the dryer when the dryer is in the drying state, and to acquire the rotation state of the motor of the dryer when the temperature change parameter is greater than the preset temperature change parameter.

[0044] The control module, if the motor is rotating in reverse, keeps the dryer in the drying state;

[0045] The confirmation module confirms that the motor is in a stalled state if the motor's rotation state is not reversed.

[0046] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the fault detection method for the dryer as described above.

[0047] This application also provides a dryer, the dryer comprising: a processor and a memory;

[0048] The memory is used to store computer programs;

[0049] The processor is used to execute the computer program stored in the memory to implement the fault detection method for the dryer as described above.

[0050] The fault detection method, apparatus, storage medium, and dryer provided in this application embodiment acquire temperature change parameters of the dryer's evaporator when the dryer is in the drying state. When the temperature change parameters are greater than a preset temperature change parameter, the rotation state of the dryer's motor is acquired. If the motor's rotation state is in reverse, the dryer remains in the drying state; if the motor's rotation state is in non-reverse, the motor is confirmed to be in a stalled state. By using the temperature change parameters of the dryer's evaporator, the method confirms whether the motor is in a stalled state, thus preventing equipment damage caused by motor stall operation and affecting normal user operation. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0053] Figure 1 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 1 .

[0054] Figure 2 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 2 .

[0055] Figure 3 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 3 .

[0056] Figure 4A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 4 .

[0057] Figure 5 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 5 .

[0058] Figure 6 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 6 .

[0059] Figure 7 This is a schematic diagram of a fault detection device for a dryer provided in an embodiment of this application.

[0060] Figure 8 This is a schematic diagram of the structure of the dryer provided in the embodiments of this application.

[0061] Figure 9 This is a schematic diagram of the structure of the heat pump system provided in this embodiment. Figure 1 .

[0062] Figure 10 This is a schematic diagram of the structure of the heat pump system provided in this embodiment. Figure 2 .

[0063] 200. Dryer; 201. Processor; 202. Memory; 203. Housing; 204. Drum; 205. Motor; 206. Compressor; 207. Evaporator; 208. First temperature sensor; 209. Condenser; 210. Second temperature sensor; 211. Throttling device; 220. Heat pump system. Detailed Implementation

[0064] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0065] The application provides a method, apparatus, storage medium, and device for fault detection of a dryer, as well as a dryer. The dryer can be a clothes dryer or a clothing processing device with a drying function. The following will describe the fault detection method, apparatus, storage medium, and dryer in detail with reference to the accompanying drawings. The dryer includes a heat pump system. Inside the dryer, the compressor, condenser, and evaporator are interconnected via several connecting pipes, allowing the refrigerant to continuously circulate along the path of "evaporator-compressor-condenser-expansion valve-evaporator." Based on the reverse Carnot principle, after the compressor starts working, the liquid refrigerant is transported to the evaporator for heating and evaporation, transforming into a gaseous state. During this transformation, heat exchange occurs with the air, cooling and dehumidifying the surrounding environment. The resulting low-temperature, low-pressure gas re-enters the compressor, where it is compressed into a high-pressure gaseous state and discharged into the condenser. In the condenser, the refrigerant condenses and releases heat, becoming a high-pressure liquid. This liquid is then throttled by the expansion valve into a low-pressure, low-temperature refrigerant. Due to the sudden pressure drop, the liquid refrigerant enters the evaporator, continuously absorbing low-temperature heat from the surrounding air and rapidly evaporating into a gaseous state. The refrigerant, having absorbed a certain amount of energy, returns to the compressor for further compression, and this cycle repeats continuously to dry the clothes.

[0066] Please refer to Figure 1 , Figure 1 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 1 .

[0067] 10. With the dryer in drying mode, obtain the temperature change parameters of the evaporator of the dryer.

[0068] 20. When the temperature change parameter is greater than the preset temperature change parameter, the rotation status of the motor of the dryer is obtained.

[0069] 30. If the motor is rotating in reverse, the dryer shall remain in the drying state.

[0070] 40. If the motor is rotating in a non-reverse state, then the motor is confirmed to be in a stalled state.

[0071] Motor stall occurs when a motor continues to output torque even at zero RPM. The root cause is either an internal motor malfunction or excessive external load. When a motor is stalled, its power factor is extremely low, and the current can reach up to seven times the rated current; prolonged stalling can burn out the motor. The term "motor stall" includes situations such as a risk of stalling, a confirmed stall fault, or unresolved stalling. When stalled, the motor cannot rotate normally, exhibiting zero RPM but still outputting torque. Failure to address the fault promptly can lead to motor damage. When a motor is stalled, the drying cycle cannot proceed normally, resulting in abnormal temperature parameters. Therefore, temperature changes can be used to determine if a stall has occurred. It's important to note that reverse rotation can also cause abnormal temperature parameters. Therefore, if the temperature change exceeds a preset value, reverse rotation should be ruled out. If the temperature change is less than or equal to the preset value, the motor is not considered stalled, and reverse rotation is not required. In some embodiments, the motor reversal signal can be used to determine whether the motor is reversing. The motor reversal signal is a signal that converts the motor reversal control signal into an electrical signal, which is then used by the control circuit to reverse the motor. If a reversal signal is obtained, the motor is considered to be in a reverse state, and the dryer continues drying. Understandably, after the preset drying time is set, it is also necessary to determine whether the clothes are completely dry. If the clothes are completely dry, the drying program is exited; if the clothes are not completely dry, drying continues until the clothes are completely dry, at which point the drying program is exited.

[0072] When the motor is running normally, the fan blades rotate at a high speed, generating a large airflow. The dry, hot air causes the moisture in the clothing to evaporate, becoming humid, hot air that exchanges heat with the evaporator. The evaporator absorbs heat from the outside, converting the low-temperature, low-pressure liquid refrigerant into a high-temperature, high-pressure gaseous state, thus lowering the evaporator temperature. However, when the motor is stalled, the fan blades rotate at a low speed, generating less airflow and resulting in low heat exchange efficiency. In this case, the evaporator temperature change is not significant. In some embodiments, the airflow can be determined by the slope of the evaporator temperature change, thus indicating whether the motor is stalled based on the fan blade rotation.

[0073] For example, please refer to Figure 2 , Figure 2 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 2 The process of obtaining the temperature change parameters of the evaporator of the dryer includes:

[0074] 11. Obtain the first temperature of the evaporator at a first time and the second temperature at a second time, and determine the slope K1 of the first temperature and the second temperature, wherein the second time is later than the first time.

[0075] 12. Determine whether the slope K1 is greater than the preset slope K0.

[0076] 13. If the slope K1 is less than or equal to the preset slope K0, then maintain the drying state.

[0077] 14. If the slope K1 is greater than the preset slope K0, then the rotation state of the motor of the dryer is obtained.

[0078] Specifically, the temperature of the evaporator can be the temperature of the middle part of the evaporator, which is the temperature of the geometric center of the evaporator tube. Since the evaporator has several parallel pipes, in some embodiments, it is assumed that four evaporator pipes are arranged in parallel in the same direction, then the temperature of the second evaporator pipe is the temperature of the middle part of the evaporator. The first time can be the first second, and the second time can be the tenth second. When the motor stalls, the airflow decreases, and the evaporator temperature rises. Assuming the temperature change slope of the middle part of the evaporator in the first and tenth seconds under normal conditions, i.e., the preset slope k0, is -5, if the temperature change slope K1 of the middle part of the evaporator in the first and tenth seconds is -6, and K1 is less than or equal to the preset slope K0, then the drying state is maintained; if the temperature change slope K1 of the middle part of the evaporator in the first and tenth seconds is -3, and the slope K1 is greater than the preset slope K0, then the rotation state of the dryer motor is obtained, and it is further determined whether it is in reverse rotation.

[0079] For example, please refer to Figure 3 , Figure 3 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 3 If the motor's rotation state is non-reverse, then after confirming that the motor is in a stalled state, the following steps are taken:

[0080] 50. Obtain the third temperature of the evaporator at a third time, and determine the temperature difference T1 between the third temperature and the second temperature, wherein the third time is later than the second time.

[0081] 60. Determine whether the temperature difference T1 between the third temperature and the second temperature is greater than or equal to the preset temperature difference Ta.

[0082] 70. If the temperature difference T1 is less than the preset temperature difference Ta, then the drying state is maintained.

[0083] 80. If the temperature difference T1 is greater than or equal to the preset temperature difference Ta, then the motor is confirmed to have a stall fault.

[0084] In some embodiments, the second time can be the tenth second or the twentieth second. When the motor stalls for a period of time, the thermal circulation system cannot work normally, and the dryer is in a natural heat dissipation state, with a reduced heat dissipation rate. At this time, the change in temperature value is more significant than the change in temperature slope. Assuming that the preset temperature difference Ta between the tenth second and the twentieth second in the middle of the evaporator under normal conditions is -5, if the temperature difference T1 between the tenth second and the twentieth second in the middle of the evaporator is -6, and the temperature difference T1 is less than the preset temperature difference Ta, then the drying state is maintained; if the temperature difference T1 between the tenth second and the twentieth second in the middle of the evaporator is -4, and the temperature difference T1 is greater than the temperature difference Ta, then after confirming that the motor is stalled, it is further confirmed that the motor has a stall fault.

[0085] For example, please refer to Figure 4 , Figure 4 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 4 If the temperature difference T1 is greater than or equal to the preset temperature difference Ta, and the motor is confirmed to have a stall fault, the method further includes:

[0086] 811. After the motor has been stopped for four hours, restart the motor and obtain the fourth temperature of the condenser at this time.

[0087] 812. After the motor has been running for five hours, the fifth temperature of the condenser is obtained, and the difference T2 between the fifth temperature and the fourth temperature is determined. The fifth duration is not less than the fourth duration.

[0088] 813. Determine whether the temperature difference T2 between the fifth temperature and the fourth temperature is greater than or equal to the preset temperature difference Tb.

[0089] 814. If the temperature difference T2 is greater than or equal to the preset temperature difference Tb, then maintain the drying state.

[0090] 815. If the temperature difference T2 is less than the preset temperature difference Tb, then it is confirmed that the motor stall fault has not been eliminated.

[0091] Specifically, after the motor has been running continuously, it needs to be stopped to reduce heat generation, and then restarted after cooling for a period of time to determine if the motor can operate normally. In some implementations, the fourth time period can be 3 seconds, and the fifth time period can be 10 seconds. Because the wall temperature of the condenser pipe is lower than the dew point temperature of the outdoor air, water vapor contained in the outdoor air condenses on the wall surface. When the dew grows to a certain size, it will slide from the condenser outlet pipe into the condensate pan below the condenser, thus forming condensate. In some embodiments, the condenser temperature is obtained by obtaining the temperature of the condenser outlet pipe. Since the compressor temperature is low, it can reach the natural heat dissipation state in a short time, while the condenser is in an exothermic state, with a higher temperature and slower cooling. In the stalled state, the condenser will maintain a high temperature, so it is necessary to continue to monitor the condenser temperature change to determine whether the stall has been eliminated. Let the preset temperature difference Tb be 10. If the temperature difference T2 is 12, then the drying state is maintained. If the temperature difference T2 is 8, and the condenser temperature drop does not reach the preset temperature, then it is confirmed that the motor stall fault has not been eliminated.

[0092] For example, please refer to Figure 5 , Figure 5 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 5 If the temperature difference T2 is less than the preset temperature difference Tb, and the motor stall fault is confirmed to have not been eliminated, the method further includes:

[0093] 821. Control the compressor and the motor to stop for six hours.

[0094] 822. Control the motor to rotate for a seventh duration, wherein the seventh duration is not less than the sixth duration.

[0095] 823. Obtain the sixth temperature of the evaporator and the seventh temperature of the condenser, and determine the temperature difference T3 between the seventh temperature and the sixth temperature.

[0096] 824. Determine whether the temperature difference T3 between the seventh temperature and the sixth temperature is less than or equal to the preset temperature difference Tc.

[0097] 825. If the temperature difference T3 is less than or equal to the preset temperature difference Tc, then start the compressor and maintain the drying state.

[0098] 826. If the temperature difference T3 is greater than the preset temperature difference Tc, then it is confirmed that the motor stall fault has not been eliminated.

[0099] Specifically, the higher the voltage, the greater the starting torque of the motor. Conversely, the more loads connected to the power supply, the lower the voltage. Since the motor and compressor are connected to the same power supply, the compressor needs to be stopped to prevent the motor voltage from being too low and the motor from failing to start normally. Furthermore, pausing the compressor for a period of time can prevent the compressor from overheating and running for an extended period while the motor is stalled. In some embodiments, the sixth and seventh time intervals can be 10 seconds each; that is, 10 seconds after the compressor and motor stop, the motor is controlled to rotate for 10 seconds, and then the temperature difference between the evaporator and condenser is determined. Since the compressor is stopped, there is only the temperature of the throttling section between the condenser and evaporator; the condenser section is at a higher temperature, while the compressor section is at a lower temperature. When the dryer is in normal operation, there will be a certain temperature difference between the condenser and evaporator. Assuming a preset temperature difference Tc of 40°C, if the temperature difference T3 is 35°C, it indicates that the fan blades are rotating normally, and the compressor is restarted to continue the drying process. If the temperature difference T3 is 45°C, it confirms that the motor stall fault has not been eliminated.

[0100] In some embodiments, after the compressor and motor have stopped for six hours, a reverse instantaneous starting current is applied to the motor to control its forward rotation. After a seventh hour of forward rotation, it is determined whether the temperature difference between the evaporator and condenser is less than or equal to a preset temperature difference value Tc. Because a reverse starting current is applied to the motor, the motor will fall due to inertia. At this time, when the motor is controlled to rotate forward, it will receive a positive impact force, which will help the motor rotate forward and solve the stall problem.

[0101] For example, please refer to Figure 6 , Figure 6 A flowchart illustrating the fault detection method for a dryer provided in this application embodiment. Figure 6 If the temperature difference T3 is greater than the preset temperature difference Tc, and the motor stall fault is confirmed to have not been eliminated, the method further includes:

[0102] 831. Control the motor to stop for eight hours.

[0103] 832. Control the motor to rotate for a ninth duration, wherein the ninth duration is not less than the eighth duration.

[0104] 833. Obtain the eighth temperature of the evaporator and the ninth temperature of the condenser, and determine the temperature difference T4 between the ninth temperature and the eighth temperature.

[0105] 834. Determine whether the temperature difference T4 between the ninth temperature and the eighth temperature is less than or equal to the preset temperature difference Td.

[0106] 835. If the temperature difference T4 is less than or equal to the preset temperature difference Td, then start the compressor and maintain the drying state.

[0107] 836. If the temperature difference T4 is greater than the preset temperature difference Td, then after the motor is shut down for ten hours, the compressor and the motor are shut down again for six hours.

[0108] Specifically, when the motor stalls, the clothes in the drum's receiving chamber may become tangled, so it is necessary to shake the clothes apart before the motor continues to run. In some embodiments, the eighth duration can be 3 seconds, and the ninth duration can be 10 seconds. That is, after stopping the motor for 3 seconds, it rotates in the opposite direction several times to shake the clothes apart, then stops the motor for 3 seconds before rotating forward again. The number of rotations can be set according to the actual situation. After the motor runs forward for 10 seconds, the temperature difference between the evaporator and the condenser is judged. Let the preset temperature difference Td be 30. If the temperature difference T4 is 25, it means that the fan is rotating normally, so the compressor is restarted to continue drying. If the temperature difference T4 is 45, it is confirmed that the motor stall fault has not been eliminated. At this time, the motor is shut down for the tenth duration, which can be 2 minutes. Setting a longer tenth duration allows the motor to have a longer cooling time before the compressor and motor are stopped again for the sixth duration, and the cycle restarts again.

[0109] For example, before obtaining the temperature change parameters of the evaporator during the drying state, the method further includes:

[0110] Start the drying program;

[0111] The compressor and motor are controlled to operate, and the motor drives the drum and fan to rotate at a preset speed.

[0112] Specifically, the motor includes a drive pulley and a conveyor belt connected to the drum and the drive pulley. The motor drives the drum to rotate via the conveyor belt. Furthermore, the drive unit also includes an output shaft connected to the fan. The motor is connected to the fan via the shaft, and through a closed circuit, the motor converts electrical energy into mechanical energy, causing the fan to rotate under its drive. The fan contains fan blades and a rotor. Driven by the motor, the fan blades and rotor can rotate simultaneously, thereby generating airflow and pressure. Before acquiring changes in the evaporator temperature, the dryer starts the drying program and drives the drum and fan to rotate at a preset speed, ensuring the heat pump program operates normally.

[0113] Please see Figure 7 , Figure 7This is a schematic diagram of a fault detection device for a dryer provided in an embodiment of this application. This application also provides a fault detection device 100 for a dryer. The detection device 100 includes a detection module 101, a control module 102, and a confirmation module 103. The detection module 101 is used to acquire the temperature change parameter of the evaporator of the dryer when the dryer is in a drying state. When the temperature change parameter is greater than a preset temperature change parameter, the detection module 101 acquires the rotation state of the motor of the dryer. If the rotation state of the motor is in reverse, the control module 102 is used to control and maintain the dryer in a drying state. If the rotation state of the motor is not in reverse, the confirmation module 103 is used to confirm that the motor is in a stalled state.

[0114] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the fault detection method for the dryer as described above.

[0115] Please see Figure 8 , Figure 9 and Figure 10 , Figure 8 This is a schematic diagram of the structure of the dryer provided in the embodiments of this application. Figure 9 This is a schematic diagram of the structure of the heat pump system provided in this embodiment. Figure 1 , Figure 10 This is a schematic diagram of the structure of the heat pump system provided in this embodiment. Figure 2This application also provides a dryer 200, which includes a processor 201 and a memory 202; the memory 202 is used to store computer programs; the processor 201 is used to execute the computer programs stored in the memory 202 to implement the aforementioned dryer fault detection method. The dryer also includes a housing 203 and a drum 204 rotatably disposed on the housing, the drum 204 forming a receiving chamber for storing and washing / drying clothes. A heat pump system 220 is disposed within the housing 203 and located below the drum 204 along the direction of gravity. The heat pump system 220 consists of an evaporator 207, a condenser 209, a compressor 206, a motor 205, a throttling device 211, the drum 204, a belt, a fan, and other components. The evaporator 207 is one of the core components of the drying cycle; its main function is to absorb heat from the outside environment from a low-temperature, low-pressure refrigerant, thereby evaporating it into a high-temperature, high-pressure gas. Inside the evaporator 207, the refrigerant exchanges heat with the external cooling medium or air, thereby absorbing heat. Therefore, the temperature of the evaporator 207 is typically low. A first temperature sensor 208 is installed in the evaporator 207 to obtain its temperature. The condenser 209 is another core component of the drying cycle. Its function is to condense moisture in the hot, humid air, reduce the humidity in the air, convert it into water, and evaporate it, thus maintaining the dry state of the equipment. Therefore, the temperature of the condenser 209 is typically high. A second temperature sensor 210 is installed in the condenser 209 to obtain its temperature.

[0116] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0117] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0118] The above provides a detailed description of the fault detection method, apparatus, storage medium, and dryer provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for fault detection in a dryer, characterized in that, include: When the dryer is in drying mode, the temperature change parameters of the evaporator of the dryer are obtained; When the temperature change parameter is greater than the preset temperature change parameter, the rotation status of the motor of the dryer is obtained; If the motor is rotating in reverse, the dryer remains in the drying state. If the motor is rotating in a non-reverse direction, then the motor is confirmed to be in a stalled state. The step of obtaining the temperature change parameters of the evaporator of the dryer includes: obtaining the second temperature of the evaporator at a second time. If the motor's rotation state is non-reverse, then confirming that the motor is in a stall state includes: obtaining the third temperature of the evaporator at a third time, and determining the temperature difference T1 between the third temperature and the second temperature, wherein the third time is later than the second time; determining whether the temperature difference T1 between the third temperature and the second temperature is greater than or equal to a preset temperature difference Ta; if the temperature difference T1 is greater than or equal to the preset temperature difference Ta, then confirming that the motor has a stall fault. If the temperature difference T1 is greater than or equal to the preset temperature difference Ta, and the motor stall fault is confirmed, the method further includes: restarting the motor after a fourth time period since the motor stopped, and obtaining the fourth temperature of the condenser at this time; obtaining the fifth temperature of the condenser after a fifth time period since the motor started, and determining the difference T2 between the fifth temperature and the fourth temperature, wherein the fifth time period is not less than the fourth time period; determining whether the temperature difference T2 between the fifth temperature and the fourth temperature is greater than or equal to the preset temperature difference Tb; if the temperature difference T2 is greater than or equal to the preset temperature difference Tb, maintaining the drying state; if the temperature difference T2 is less than the preset temperature difference Tb, confirming that the motor stall fault has not been eliminated.

2. The method for fault detection of a dryer according to claim 1, characterized in that, The process of obtaining the temperature change parameters of the evaporator of the dryer includes: Obtain the first temperature of the evaporator at a first time, and determine the slope K1 between the first temperature and the second temperature, wherein the second time is later than the first time; Determine whether the slope K1 is greater than the preset slope K0; If the slope K1 is less than or equal to the preset slope K0, then the drying state is maintained; If the slope K1 is greater than the preset slope K0, then the rotation state of the motor of the dryer is obtained.

3. The method for fault detection of a dryer according to claim 1, characterized in that, If the motor's rotation state is non-reverse, then confirming that the motor is in a stalled state includes: If the temperature difference T1 is less than the preset temperature difference Ta, then the drying state is maintained.

4. The method for fault detection of a dryer according to claim 3, characterized in that, If the temperature difference T2 is less than the preset temperature difference Tb, and the motor stall fault is confirmed to have not been eliminated, the method further includes: The compressor and the motor are stopped for a sixth period of time. The motor is controlled to rotate for a seventh duration, the seventh duration being no less than the sixth duration; Obtain the sixth temperature of the evaporator and the seventh temperature of the condenser, and determine the temperature difference T3 between the seventh temperature and the sixth temperature; Determine whether the temperature difference T3 between the seventh temperature and the sixth temperature is less than or equal to the preset temperature difference Tc; If the temperature difference T3 is less than or equal to the preset temperature difference Tc, the compressor is started and the drying process is maintained. If the temperature difference T3 is greater than the preset temperature difference Tc, then the motor stall fault is confirmed to have not been eliminated.

5. A fault detection method for a dryer according to claim 4, characterized in that, If the temperature difference T3 is greater than the preset temperature difference Tc, and the motor stall fault is confirmed to have not been eliminated, the method further includes: The motor is stopped for the eighth time period. The motor is controlled to rotate for a ninth duration, the ninth duration being no less than the eighth duration; Obtain the eighth temperature of the evaporator and the ninth temperature of the condenser, and determine the temperature difference T4 between the ninth temperature and the eighth temperature; Determine whether the temperature difference T4 between the ninth temperature and the eighth temperature is less than or equal to the preset temperature difference Td; If the temperature difference T4 is less than or equal to the preset temperature difference Td, then the compressor is started and the drying state is maintained. If the temperature difference T4 is greater than the preset temperature difference Td, then after the motor is shut down for ten hours, the compressor and motor will be shut down again for six hours.

6. The method for fault detection of a dryer according to claim 1, characterized in that, Before obtaining the temperature change parameters of the evaporator during the drying process, the method further includes: Start the drying program; The compressor and motor are controlled to operate, and the motor drives the drum and fan to rotate at a preset speed.

7. A fault detection device for a dryer, characterized in that, include: The detection module is used to acquire the temperature change parameters of the evaporator of the dryer when the dryer is in the drying state, specifically to acquire the second temperature of the evaporator at a second time; and to acquire the rotation state of the motor of the dryer when the temperature change parameter is greater than the preset temperature change parameter. The control module, if the motor is rotating in reverse, keeps the dryer in the drying state; The confirmation module confirms that the motor is in a stalled state if the motor's rotation state is non-reverse. And for obtaining the third temperature of the evaporator at a third time after confirming that the motor is in a stall state if the motor's rotation state is non-reverse, and determining the temperature difference T1 between the third temperature and the second temperature, wherein the third time is later than the second time; determining whether the temperature difference T1 between the third temperature and the second temperature is greater than or equal to a preset temperature difference Ta; if the temperature difference T1 is greater than or equal to the preset temperature difference Ta, then confirming that the motor has a stall fault; And after confirming a motor stall fault if the temperature difference T1 is greater than or equal to the preset temperature difference Ta, the motor is restarted after a fourth time period following a shutdown, and the fourth temperature of the condenser is obtained at this time; after a fifth time period following motor startup, the fifth temperature of the condenser is obtained at this time, and the difference T2 between the fifth temperature and the fourth temperature is determined, wherein the fifth time period is not less than the fourth time period; it is determined whether the temperature difference T2 between the fifth temperature and the fourth temperature is greater than or equal to the preset temperature difference Tb; if the temperature difference T2 is greater than or equal to the preset temperature difference Tb, the drying state is maintained; if the temperature difference T2 is less than the preset temperature difference Tb, it is confirmed that the motor stall fault has not been eliminated.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the fault detection method for the dryer as described in any one of claims 1 to 6.

9. A dryer, characterized in that, include: Processor and memory; The memory is used to store computer programs; The processor is used to execute the computer program stored in the memory to implement the fault detection method for the dryer as described in any one of claims 1 to 6.

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