Fault handling method and device, low-temperature storage box and storage medium

Abstract

The present disclosure provides a fault handling method and apparatus, a cryogenic storage box, and a storage medium, relating to the field of control. The fault handling method includes: if a first sensor for collecting the temperature within the cryogenic storage box fails, adjusting the frequencies of the high-temperature compressor and the low-temperature compressor in a cascade refrigeration system to preset target frequencies; and controlling the high-temperature compressor and the low-temperature compressor to shut down after a preset refrigeration time.

Description

Technical Field

[0001] The present disclosure relates to the field of control, and in particular to a fault handling method and device, a low-temperature preservation box, and a storage medium. Background Art

[0002] After the low-temperature preservation box is manually set to a set temperature, the internal temperature of the equipment is transmitted to the main control board through the temperature sensor installed inside. The main control board controls the start and stop and operating frequency of the compressor to achieve precise control of the internal temperature of the equipment.

[0003] If the temperature sensor or the control display panel used to enter the set temperature fails, the compressor will operate according to the factory-set on / off times and operating frequency. Summary of the Invention

[0004] The inventors note that compressor operation is determined by the values ​​detected by the ambient temperature sensor and the internal temperature sensor. In related art, if a temperature sensor or the control and display panel used to input the set temperature fails, the compressor will operate according to the factory-set on / off times and operating frequency. In this case, since the factory equipment parameters do not match the current operating environment, reliable cooling results cannot be achieved.

[0005] Accordingly, the present disclosure provides a fault handling solution so that even if a temperature sensor or a control display panel for inputting a set temperature fails, the low-temperature preservation box can still achieve a reliable cooling result.

[0006] According to a first aspect of an embodiment of the present disclosure, a fault handling method is provided, comprising: in the event that a first sensor for collecting the temperature inside a low-temperature preservation box fails, adjusting the frequencies of a high-temperature compressor and a low-temperature compressor in a cascade refrigeration system to preset target frequencies respectively; and controlling the high-temperature compressor and the low-temperature compressor to stop after a preset refrigeration time.

[0007] In some embodiments, the preset cooling time is associated with a set temperature.

[0008] In some embodiments, adjusting the frequencies of the high-temperature compressor and the low-temperature compressor in the cascade refrigeration system to preset target frequencies respectively includes: determining whether the cascade refrigeration system is in an operation stage; if the cascade refrigeration system is in an operation stage, increasing the frequencies of the high-temperature compressor and the low-temperature compressor respectively so that the high-temperature compressor operates at a first target frequency and the low-temperature compressor operates at a second target frequency.

[0009] In some embodiments, controlling the high-temperature compressor and the low-temperature compressor to shut down includes: reducing the frequency of the high-temperature compressor and the low-temperature compressor; controlling the low-temperature compressor to shut down when the operating frequency of the high-temperature compressor and the low-temperature compressor is less than a preset frequency threshold; and controlling the high-temperature compressor to shut down after a first preset time.

[0010] In some embodiments, adjusting the frequencies of the high-temperature compressor and the low-temperature compressor in the cascade refrigeration system to preset target frequencies respectively includes: if the cascade refrigeration system is in a shutdown stage, controlling the high-temperature compressor to start at a first starting frequency; increasing the frequency of the high-temperature compressor so that the high-temperature compressor runs at the first target frequency; after a second preset time, controlling the low-temperature compressor to start at a second starting frequency; and increasing the frequency of the low-temperature compressor so that the low-temperature compressor runs at the second target frequency.

[0011] In some embodiments, the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature.

[0012] In some embodiments, controlling the high-temperature compressor and the low-temperature compressor to shut down includes: reducing the frequency of the high-temperature compressor and the low-temperature compressor; controlling the low-temperature compressor to shut down when the operating frequency of the high-temperature compressor and the low-temperature compressor is less than a preset frequency threshold; and controlling the high-temperature compressor to shut down after a third preset time.

[0013] In some embodiments, when a second sensor for collecting ambient temperature in the low-temperature preservation box fails, it is detected whether the low-temperature preservation box is powered off; if the low-temperature preservation box is not powered off, the current ambient temperature value is set to the ambient temperature value last collected by the second sensor before the failure.

[0014] In some embodiments, if the low-temperature storage box is powered off, the current ambient temperature value is set to a factory preset value.

[0015] In some embodiments, when a communication failure occurs on a control display panel for inputting a set temperature in the low-temperature preservation box, the set temperature is controlled to remain unchanged.

[0016] According to a second aspect of an embodiment of the present disclosure, a fault handling device is provided, comprising: a first processing module, configured to adjust the frequencies of a high-temperature compressor and a low-temperature compressor in a cascade refrigeration system to preset target frequencies, respectively, when a first sensor for collecting the temperature inside a low-temperature preservation box fails; and a second processing module, configured to control the high-temperature compressor and the low-temperature compressor to stop after a preset refrigeration time.

[0017] In some embodiments, the preset cooling time is associated with a set temperature.

[0018] In some embodiments, the first processing module is configured to determine whether the cascade refrigeration system is in an operating stage. If the cascade refrigeration system is in an operating stage, the high-temperature compressor and the low-temperature compressor are respectively increased in frequency so that the high-temperature compressor operates at a first target frequency and the low-temperature compressor operates at a second target frequency.

[0019] In some embodiments, the second processing module is configured to reduce the frequency of the high-temperature compressor and the low-temperature compressor, and when the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, the low-temperature compressor is controlled to shut down, and after a first preset time, the high-temperature compressor is controlled to shut down.

[0020] In some embodiments, the first processing module is configured to control the high-temperature compressor to start at a first starting frequency if the cascade refrigeration system is in a shutdown stage, increase the frequency of the high-temperature compressor so that the high-temperature compressor operates at the first target frequency, and control the low-temperature compressor to start at a second starting frequency after a second preset time, increase the frequency of the low-temperature compressor so that the low-temperature compressor operates at the second target frequency.

[0021] In some embodiments, the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature.

[0022] In some embodiments, the second processing module is configured to reduce the frequency of the high-temperature compressor and the low-temperature compressor, and when the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, the low-temperature compressor is controlled to shut down, and after a third preset time, the high-temperature compressor is controlled to shut down.

[0023] In some embodiments, the above-mentioned device also includes a third processing module, which is configured to detect whether the low-temperature preservation box is powered off when the second sensor for collecting ambient temperature in the low-temperature preservation box fails. If the low-temperature preservation box is not powered off, the current ambient temperature value is set to the ambient temperature value last collected by the second sensor before the failure.

[0024] In some embodiments, the third processing module is configured to set the current ambient temperature value to a factory preset value if the low-temperature storage box is powered off.

[0025] In some embodiments, the above-mentioned device further includes: a fourth processing module configured to control the set temperature to remain unchanged when a communication failure occurs on a control display panel for inputting the set temperature in the low-temperature preservation box.

[0026] According to a third aspect of an embodiment of the present disclosure, a fault handling device is provided, comprising: a memory configured to store instructions; a processor coupled to the memory, the processor being configured to execute a method as described in any of the above embodiments based on the instructions stored in the memory.

[0027] According to a fourth aspect of an embodiment of the present disclosure, a low-temperature preservation box is provided, comprising a fault handling device as described in any of the above embodiments.

[0028] According to a fifth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0029] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 This is a structural diagram of a cascade refrigeration system according to an embodiment of the present disclosure;

[0032] Figure 2 This is a flowchart of a fault handling method according to an embodiment of the present disclosure;

[0033] Figure 3 This is a flowchart of a fault handling method according to another embodiment of the present disclosure;

[0034] Figure 4 This is a flowchart of a fault handling method according to another embodiment of the present disclosure;

[0035] Figure 5 This is a flowchart of a fault handling method according to another embodiment of the present disclosure;

[0036] Figure 6 This is a structural diagram of a fault handling device according to an embodiment of the present disclosure;

[0037] Figure 7 This is a structural diagram of a fault handling device according to another embodiment of the present disclosure;

[0038] Figure 8This is a structural diagram of a fault handling device according to another embodiment of the present disclosure;

[0039] Figure 9 This is a schematic structural diagram of a low-temperature storage box according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0041] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0042] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0043] Technologies, methods and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and equipment should be considered part of the authorization specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] Figure 1 FIG. 1 is a schematic structural diagram of a cascade refrigeration system according to an embodiment of the present disclosure. Figure 1 As shown, the cascade refrigeration system includes a high-temperature refrigerant circuit and a low-temperature refrigerant circuit. The high-temperature refrigerant circuit is equipped with a high-temperature compressor 101, an anti-condensation tube 102, a condenser 103, a first filter 104, a first capillary tube 105, an evaporative condenser 106, and a gas-liquid separator 107. The low-temperature refrigerant circuit is equipped with a low-temperature compressor 108, an oil separator 109, an evaporative condenser 106, a second filter 110, a second capillary tube 111, and an evaporator 112. In addition, an oil return system 113 is provided between the oil separator 109 and the low-temperature compressor 108.

[0047] When the cascade refrigeration system is operating normally and stably, the refrigeration operation mode is as follows:

[0048] After a rapid temperature increase, the cascade refrigeration system enters a stable operating phase. If the internal temperature Td reaches the required level, i.e., the shutdown condition is met, the high and low temperature compressors shut down. If the internal temperature Td rises below the required level, or the cooling stop time t exceeds the limit, the cascade refrigeration system begins cooling. The high-temperature compressor starts up and increases its frequency to the target frequency, maintaining operation for a period of time. The low-temperature compressor then starts up and increases its frequency to the target frequency until the internal temperature Td reaches the required level, meeting the shutdown condition.

[0049] In some embodiments, the cooling stop time t, the high temperature compressor target frequency F Hq and low temperature compressor target frequency F Lq Divided according to the set temperature Ts and ambient temperature Ta.

[0050] For example, the values ​​of the cooling stop time t in each divided interval are shown in Table 1 below.

[0051]

[0052] Table 1

[0053] For example, the target frequencies of the high-temperature compressor and the low-temperature compressor in each divided range are shown in Table 2 below:

[0054]

[0055]

[0056] Table 2

[0057] It should be noted that after the high-temperature compressor and the low-temperature compressor are shut down, they are restarted after the refrigeration stop time t has passed.

[0058] Figure 2 The following is a flow chart of a fault handling method according to an embodiment of the present disclosure. In some embodiments, the following fault handling method is executed by a fault handling device.

[0059] In step 201 , when a first sensor for collecting the temperature inside the low-temperature storage box fails, the frequencies of the high-temperature compressor and the low-temperature compressor in the cascade refrigeration system are respectively adjusted to preset target frequencies.

[0060] In some embodiments, the step of adjusting the frequencies of the high temperature compressor and the low temperature compressor is as follows: Figure 3 shown.

[0061] In step 202, after a preset cooling time, the high-temperature compressor and the low-temperature compressor are controlled to stop.

[0062] In some embodiments, the steps of controlling the high temperature compressor and the low temperature compressor to stop are as follows: Figure 3 shown.

[0063] In some embodiments, the preset cooling time is associated with a set temperature.

[0064] For example, the values ​​of the preset cooling time in each divided interval are shown in Table 3 below.

[0065] Ts Ts≤-80℃ -80℃<Ts≤-60℃ Ts>-60℃ Preset cooling time t1 t2 t3

[0066] Table 3

[0067] Figure 3 1 is a flow chart of a fault handling method according to another embodiment of the present disclosure. In some embodiments, the following fault handling method is executed by a fault handling device.

[0068] In step 301 , if a first sensor for collecting the temperature inside the low-temperature preservation box fails, step 302 is executed.

[0069] In step 302, it is determined whether the cascade refrigeration system is in the operation stage.

[0070] If the cascade refrigeration system is in the operation stage, step 303 is executed; if the cascade refrigeration system is in the shutdown stage, step 305 is executed.

[0071] In step 303 , the high-temperature compressor and the low-temperature compressor are respectively frequency-increased so that the high-temperature compressor operates at a first target frequency and the low-temperature compressor operates at a second target frequency.

[0072] In some embodiments, the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature.

[0073] For example, the first target frequency and the second target frequency are obtained using Table 2 above.

[0074] In step 304, after a preset cooling time, the high-temperature compressor and the low-temperature compressor are controlled to reduce their frequencies and then stop.

[0075] In some embodiments, the high-temperature compressor and the low-temperature compressor are frequency-reduced. When the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold (for example, the preset frequency threshold is 33 Hz), the low-temperature compressor is controlled to shut down. After a first preset time (for example, the first preset time is 10 seconds), the high-temperature compressor is controlled to shut down.

[0076] In some embodiments, the preset cooling time is obtained using Table 3 above.

[0077] In step 305 , the high temperature compressor is controlled to start at a first starting frequency, and the frequency of the high temperature compressor is increased so that the high temperature compressor operates at a first target frequency.

[0078] For example, the first starting frequency is 45 Hz.

[0079] In step 306 , after a second preset time, the low-temperature compressor is controlled to start at a second starting frequency, and the frequency of the low-temperature compressor is increased so that the low-temperature compressor operates at a second target frequency.

[0080] For example, the second starting frequency is 33 Hz, and the second preset time is 3 minutes.

[0081] In some embodiments, the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature.

[0082] For example, the first target frequency and the second target frequency are obtained using Table 2 above.

[0083] In step 307, after a preset cooling time, the high-temperature compressor and the low-temperature compressor are controlled to reduce their frequencies and then stop.

[0084] In some embodiments, the high-temperature compressor and the low-temperature compressor are frequency-reduced. When the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold (for example, the preset frequency threshold is 33 Hz), the low-temperature compressor is controlled to shut down. After a third preset time (for example, the third preset time is 10s), the high-temperature compressor is controlled to shut down.

[0085] In some embodiments, the preset cooling time is obtained using Table 3 above.

[0086] In the fault handling method provided in the above-mentioned embodiment of the present disclosure, when the first sensor for collecting the temperature inside the low-temperature preservation box fails, the operating frequency and refrigeration time of the high-temperature compressor and the low-temperature compressor are controlled according to the ambient temperature and the set temperature, thereby ensuring that the low-temperature preservation box obtains a reliable refrigeration result.

[0087] Figure 4 1 is a flow chart of a fault handling method according to another embodiment of the present disclosure. In some embodiments, the following fault handling method is executed by a fault handling device.

[0088] In step 401 , if a second sensor for collecting ambient temperature in the low-temperature preservation box fails, step 402 is executed.

[0089] In step 402, it is detected whether the low temperature storage box is powered off.

[0090] If the low-temperature storage box is powered on, step 403 is executed; if the low-temperature storage box is powered off, step 404 is executed.

[0091] In step 403, the current ambient temperature value is set to the ambient temperature value last collected by the second sensor before the failure.

[0092] In step 404, the current ambient temperature value is set as a factory preset value.

[0093] Therefore, when the second sensor for collecting the ambient temperature in the low-temperature preservation box fails, the corresponding ambient temperature value is selected according to whether the low-temperature preservation box is powered off, thereby ensuring that the low-temperature preservation box obtains a reliable cooling result.

[0094] Figure 5 1 is a flow chart of a fault handling method according to another embodiment of the present disclosure. In some embodiments, the following fault handling method is executed by a fault handling device.

[0095] In step 501 , if a communication failure occurs on a control display panel for inputting a set temperature in the low-temperature preservation box, step 502 is executed.

[0096] In step 502, the set temperature is controlled to remain unchanged.

[0097] For example, if the set temperature has been changed, the set temperature will remain at the changed value; if the set temperature has not been changed, the set temperature will remain at the factory value.

[0098] Therefore, in the event of a communication failure on the control display panel for inputting the set temperature in the low-temperature preservation box, the set temperature is controlled to remain unchanged, thereby ensuring that the low-temperature preservation box obtains a reliable cooling result.

[0099] Figure 6 FIG. 1 is a schematic diagram of the structure of a fault handling device according to an embodiment of the present disclosure. Figure 6 As shown, the fault processing device includes a first processing module 61 and a second processing module 62 .

[0100] The first processing module 61 is configured to adjust the frequencies of the high-temperature compressor and the low-temperature compressor in the cascade refrigeration system to preset target frequencies respectively when a first sensor for collecting the temperature in the low-temperature preservation box fails.

[0101] The second processing module 62 is configured to control the high-temperature compressor and the low-temperature compressor to stop after a preset cooling time.

[0102] In some embodiments, the preset cooling time is associated with a set temperature.

[0103] In some embodiments, the first processing module 61 determines whether the cascade refrigeration system is in operation. If the cascade refrigeration system is in operation, the high-temperature compressor and the low-temperature compressor are respectively increased in frequency so that the high-temperature compressor operates at a first target frequency and the low-temperature compressor operates at a second target frequency. In this case, the second processing module 62 reduces the frequency of the high-temperature compressor and the low-temperature compressor. If the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, the low-temperature compressor is controlled to shut down. After a first preset time, the high-temperature compressor is controlled to shut down.

[0104] In some embodiments, if the cascade refrigeration system is in a shutdown phase, the first processing module 61 is configured to control the high-temperature compressor to start at a first startup frequency, increase the frequency of the high-temperature compressor so that the high-temperature compressor operates at a first target frequency, and, after a second preset time, control the low-temperature compressor to start at a second startup frequency, increase the frequency of the low-temperature compressor so that the low-temperature compressor operates at the second target frequency. In this case, the second processing module 62 reduces the frequency of both the high-temperature and low-temperature compressors, and, if the operating frequencies of both the high-temperature and low-temperature compressors are less than a preset frequency threshold, controls the low-temperature compressor to shut down, and controls the high-temperature compressor to shut down after a third preset time.

[0105] In some embodiments, the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature.

[0106] Figure 7 This is a structural diagram of a fault handling device according to another embodiment of the present disclosure. Figure 7 and Figure 6 The difference is that in Figure 7 In the illustrated embodiment, the fault processing device further includes a third processing module 63 .

[0107] The third processing module 63 is configured to detect whether the low-temperature preservation box is powered off when the second sensor for collecting ambient temperature in the low-temperature preservation box fails. If the low-temperature preservation box is powered on, the third processing module 63 is configured to set the current ambient temperature value to the ambient temperature value last collected by the second sensor before the failure.

[0108] In some embodiments, the third processing module 63 is configured to set the current ambient temperature value to a factory preset value if the low-temperature storage box is powered off.

[0109] In some embodiments, as Figure 7 As shown, the fault processing device further includes a fourth processing module 64. The fourth processing module 64 is configured to control the set temperature to remain unchanged when a communication failure occurs on the control display panel for inputting the set temperature in the low-temperature preservation box.

[0110] Figure 8FIG. 1 is a structural diagram of a fault handling device according to another embodiment of the present disclosure. Figure 8 As shown, the fault processing includes a memory 81 and a processor 82 .

[0111] The memory 81 is used to store instructions. The processor 82 is coupled to the memory 81. The processor 82 is configured to execute the instructions stored in the memory. Figure 2-5 The method according to any one of the embodiments.

[0112] like Figure 8 As shown, the fault processing also includes a communication interface 83 for exchanging information with other devices. At the same time, the fault processing also includes a bus 84, through which the processor 82, the communication interface 83, and the memory 81 communicate with each other.

[0113] Memory 81 may include high-speed RAM memory or non-volatile memory, such as at least one disk storage device. Memory 81 may also be a memory array. Memory 81 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0114] Furthermore, the processor 82 may be a central processing unit (CPU), or may be an application-specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the present disclosure.

[0115] The present disclosure also relates to a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which, when executed by a processor, implement the following Figure 2-5 The method according to any one of the embodiments.

[0116] Figure 9 This is a schematic diagram of the structure of a low-temperature storage box according to an embodiment of the present disclosure. Figure 9 As shown, the low temperature storage box 90 includes a fault handling device 91. The fault handling device 91 is Figure 6-8 The fault handling device involved in any embodiment.

[0117] In some embodiments, the functional units described above may be implemented as general-purpose processors, programmable logic controllers (PLC), digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof, for performing the functions described in the present disclosure.

[0118] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or by a program to instruct the relevant hardware, and the program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0119] The description of the present disclosure is provided for purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the disclosed form. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present disclosure and to enable those skilled in the art to understand the present disclosure and design various embodiments with various modifications suitable for specific applications.

Claims

1. A fault handling method, comprising: When a first sensor for collecting the temperature inside the low-temperature storage box fails, the frequencies of the high-temperature compressor and the low-temperature compressor in the cascade refrigeration system are respectively adjusted to preset target frequencies; After a preset cooling time, controlling the high-temperature compressor and the low-temperature compressor to stop; The steps of adjusting the frequencies of the high-temperature compressor and the low-temperature compressor in the cascade refrigeration system to preset target frequencies include: Determining whether the cascade refrigeration system is in an operating stage; If the cascade refrigeration system is in a shutdown stage, controlling the high-temperature compressor to start at a first starting frequency; increasing the frequency of the high-temperature compressor so that the high-temperature compressor operates at a first target frequency; After a second preset time, controlling the low-temperature compressor to start at a second starting frequency; The low temperature compressor is frequency-increased so that the low temperature compressor operates at a second target frequency, wherein the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature.

2. The method according to claim 1, wherein The preset cooling time is associated with the set temperature.

3. The method according to claim 1, further comprising: If the cascade refrigeration system is in operation, the high-temperature compressor and the low-temperature compressor are respectively frequency-increased so that the high-temperature compressor operates at the first target frequency and the low-temperature compressor operates at the second target frequency.

4. The method according to claim 3, wherein: Controlling the high-temperature compressor and the low-temperature compressor to stop includes: reducing the frequency of the high-temperature compressor and the low-temperature compressor; When the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, controlling the low-temperature compressor to stop; After a first preset time, the high-temperature compressor is controlled to stop.

5. The method according to claim 1, wherein Controlling the high-temperature compressor and the low-temperature compressor to stop includes: reducing the frequency of the high-temperature compressor and the low-temperature compressor; When the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, controlling the low-temperature compressor to stop; After a third preset time, the high-temperature compressor is controlled to stop.

6. The method according to claim 1, further comprising: In the event that a second sensor for collecting ambient temperature in the low-temperature preservation box fails, detecting whether the low-temperature preservation box is powered off; If the low-temperature storage box is not powered off, the current ambient temperature value is set to the ambient temperature value last collected by the second sensor before the failure.

7. The method according to claim 6, further comprising: If the low-temperature storage box is powered off, the current ambient temperature value is set to the factory preset value.

8. The method according to claim 1, further comprising: In the event of a communication failure on a control display panel for inputting a set temperature in the low-temperature preservation box, the set temperature is controlled to remain unchanged.

9. A fault handling device, comprising: a first processing module configured to, in the event that a first sensor for collecting the temperature inside the low-temperature preservation box fails, adjust the frequencies of a high-temperature compressor and a low-temperature compressor in a cascade refrigeration system to preset target frequencies, respectively, wherein it is determined whether the cascade refrigeration system is in an operating phase; if the cascade refrigeration system is in a shutdown phase, control the high-temperature compressor to start at a first starting frequency, increase the frequency of the high-temperature compressor so that the high-temperature compressor operates at the first target frequency; and after a second preset time, control the low-temperature compressor to start at a second starting frequency, increase the frequency of the low-temperature compressor so that the low-temperature compressor operates at a second target frequency, wherein the first target frequency and the second target frequency are associated with an ambient temperature and a set temperature; The second processing module is configured to control the high-temperature compressor and the low-temperature compressor to stop after a preset cooling time.

10. The device according to claim 9, wherein The preset cooling time is associated with the set temperature.

11. The device according to claim 9, wherein The first processing module is configured to, if the cascade refrigeration system is in operation, increase the frequency of the high-temperature compressor and the low-temperature compressor respectively, so that the high-temperature compressor operates at the first target frequency and the low-temperature compressor operates at the second target frequency.

12. The device according to claim 11, wherein The second processing module is configured to reduce the frequency of the high-temperature compressor and the low-temperature compressor, and control the low-temperature compressor to stop when the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, and control the high-temperature compressor to stop after a first preset time.

13. The device according to claim 9, wherein The second processing module is configured to reduce the frequency of the high-temperature compressor and the low-temperature compressor, and control the low-temperature compressor to stop when the operating frequencies of the high-temperature compressor and the low-temperature compressor are less than a preset frequency threshold, and control the high-temperature compressor to stop after a third preset time.

14. The apparatus according to claim 9, further comprising: The third processing module is configured to detect whether the low-temperature preservation box is powered off when the second sensor for collecting ambient temperature in the low-temperature preservation box fails. If the low-temperature preservation box is powered on, the third processing module is configured to set the current ambient temperature value to the ambient temperature value last collected by the second sensor before the failure.

15. The device according to claim 14, wherein The third processing module is configured to set the current ambient temperature value to a factory preset value if the low-temperature preservation box is powered off.

16. The apparatus according to claim 9, further comprising: The fourth processing module is configured to control the set temperature to remain unchanged when a communication failure occurs on a control display panel for inputting the set temperature in the low-temperature preservation box.

17. A fault handling device, comprising: a memory configured to store instructions; A processor is coupled to the memory, and the processor is configured to execute the method according to any one of claims 1 to 8 based on instructions stored in the memory.

18. A low-temperature storage box, comprising the fault handling device according to any one of claims 9 to 17.

19. A non-transitory computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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