Fault detection method, device and equipment for refrigeration device and storage medium

Abstract

The embodiment of the invention provides a fault detection method, device and equipment of a refrigeration device and a storage medium, the refrigeration device is provided with a compressor, a refrigerant pipeline, an electromagnetic valve and an evaporator, and the refrigerant pipeline is connected with an outlet of the compressor, the evaporator and an inlet of the compressor. The electromagnetic valve is arranged at the position, located between an outlet of a compressor and an evaporator, of a refrigerant pipeline and used for controlling a refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting, and the method comprises the steps that in response to a defrosting instruction, the electromagnetic valve is controlled to be in an on state, so that the refrigerant in the compressor flows to the evaporator through the electromagnetic valve, frost on the surface of the evaporator is melted; acquiring a first temperature rise parameter between the electromagnetic valve and the evaporator; and under the condition that the first temperature rise parameter meets the first condition, it is determined that the electromagnetic valve is in a first fault state. The fault type of the electromagnetic valve is intelligently judged, and the reason of the fault is intelligently positioned.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a fault detection method, device, equipment and storage medium for a refrigeration device. Background Art

[0002] In the related art, when the defrost valve link of a cold storage refrigerator using hot gas defrosting fails, the defrost solenoid valve can only be checked on site after the failure, and it is difficult to implement link failure analysis through intelligent means. Basically, it is impossible to intelligently determine what the specific failure is, it is impossible to locate the failure, and it is impossible to analyze the problem. There is currently no effective solution to this problem. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a fault detection method, device, equipment and storage medium for a refrigeration device, which are intended to intelligently determine the fault type of the solenoid valve and intelligently locate the cause of the fault.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application provides a fault detection method for a refrigeration device, wherein the refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator, wherein the refrigerant pipeline connects the outlet of the compressor, the evaporator and the inlet of the compressor, and the solenoid valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting, and the method comprises:

[0006] In response to a defrost instruction, the solenoid valve is controlled to be in a conducting state, so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts;

[0007] Acquiring a first temperature rise parameter between the solenoid valve and the evaporator;

[0008] When the first temperature rise parameter satisfies a first condition, it is determined that the solenoid valve is in a first fault state.

[0009] In the above solution, when the first temperature rise parameter satisfies a first condition, determining that the solenoid valve is in a first fault state includes:

[0010] When the first temperature rise parameter satisfies the first condition, obtaining a second temperature rise parameter between the evaporator and the compressor in the refrigeration device within a first preset time period;

[0011] When the second temperature rise parameter is less than the first temperature rise threshold, it is determined that the solenoid valve is in the first fault state.

[0012] In the above solution, the method further includes:

[0013] When the second temperature rise parameter is greater than or equal to the first temperature rise threshold, it is determined that the solenoid valve is in a second fault state.

[0014] In the above solution, the value range of the first preset time length is 10-15 seconds; the value range of the first temperature rise threshold is 3-15°C.

[0015] In the above solution, before controlling the solenoid valve to be in a conducting state in response to the defrost instruction, the method further includes:

[0016] When the defrost instruction is not generated, obtaining a third temperature rise parameter between the solenoid valve and the evaporator;

[0017] When the third temperature rise parameter satisfies the second condition, it is determined that the solenoid valve is in a third fault state.

[0018] In the above solution, after the solenoid valve is in the on state, the method further includes:

[0019] Acquiring a fourth temperature rise parameter between the evaporator and the compressor within a second preset time period; the fourth temperature rise parameter represents a temperature value between the evaporator and the compressor after the second preset time period;

[0020] When the fourth temperature rise parameter is less than the second temperature rise threshold, it is determined that the refrigeration device is in the first defrosting state.

[0021] In the above solution, the value range of the second preset time length is 10-40 minutes; the value range of the second temperature rise threshold is 0-4°C.

[0022] In the above solution, the first temperature rise parameter includes at least one of a unit temperature rise value and a first temperature rise value within a third preset time; when the first temperature rise parameter satisfies a first condition, determining that the solenoid valve is in a first fault state includes:

[0023] When the unit temperature rise value is less than the third temperature rise threshold, determining that the solenoid valve is in a first fault state;

[0024] And / or, when the first temperature rise value is less than the fourth temperature rise threshold, it is determined that the solenoid valve is in a first fault state.

[0025] In the above solution, the value range of the third temperature rise threshold is 1-8°C; the value range of the fourth temperature rise threshold is 10-50°C.

[0026] In the above scheme, the refrigeration device also includes an expansion valve; the expansion valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for refrigeration; the third temperature rise parameter includes at least one of a first temperature value between the solenoid valve and the evaporator at a first preset moment and a second temperature rise value between the solenoid valve and the evaporator per unit time; when the third temperature rise parameter satisfies the second condition, determining that the solenoid valve is in the third fault state includes:

[0027] Acquire a second temperature value between the expansion valve and the evaporator at the first preset time;

[0028] When the difference between the first temperature value and the second temperature value is greater than or equal to a temperature threshold, determining that the solenoid valve is in a third fault state;

[0029] And / or, obtaining the duration of the second temperature rise value;

[0030] When the duration is greater than a time threshold, it is determined that the solenoid valve is in a third fault state.

[0031] In the above solution, the temperature threshold value ranges from 3 to 8° C.; the fifth temperature rise threshold value ranges from 3 to 8° C.; and the time threshold value ranges from 5 to 50 seconds.

[0032] The embodiment of the present application provides a fault detection device for a refrigeration device, wherein the refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator, wherein the refrigerant pipeline connects the outlet of the compressor, the evaporator and the inlet of the compressor, and the solenoid valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting, and the fault detection device comprises:

[0033] A first control module, configured to control the solenoid valve to be in a conducting state in response to a defrost instruction, so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts;

[0034] A second control module is used to control the refrigerant in the compressor to flow to the evaporator through the solenoid valve, so as to melt the frost on the surface of the evaporator;

[0035] A first acquisition module, used to acquire a first temperature rise parameter between the solenoid valve and the evaporator;

[0036] The first determination module is used to determine that the solenoid valve is in a first fault state when the first temperature rise parameter meets a first condition.

[0037] An embodiment of the present application provides a fault detection device for a refrigeration device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the program, the above-mentioned fault detection method for the refrigeration device is implemented.

[0038] An embodiment of the present application provides a storage medium, wherein the storage medium stores executable instructions. When the executable instructions are executed by a processor, the above-mentioned fault detection method for the refrigeration device is implemented.

[0039] An embodiment of the present application provides a fault detection method, device, equipment and storage medium for a refrigeration device, wherein the refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator, wherein the refrigerant pipeline connects the outlet of the compressor, the evaporator and the inlet of the compressor, and the solenoid valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting. The method comprises: in response to a defrost instruction, controlling the solenoid valve to be in a conducting state so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts; obtaining a first temperature rise parameter between the solenoid valve and the evaporator; and determining that the solenoid valve is in a first fault state when the first temperature rise parameter satisfies a first condition. By adopting the technical solution of the embodiment of the present application, the first temperature rise parameter of the rear part of the solenoid valve is analyzed. When the analysis result indicates that the first temperature rise parameter satisfies the first condition, it can be determined that the solenoid valve is in a first fault state, and the first condition and the first fault state can be located, thereby realizing intelligent judgment of the fault type of the solenoid valve and intelligent location of the cause of the fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of a process flow for implementing a fault detection method for a refrigeration device according to an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the composition structure of a refrigeration machine for cold chain transportation of a refrigeration device in an application example of the present application;

[0042] Figure 3 This is a schematic diagram of the structure of a fault detection device for a refrigeration device according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram of a hardware entity structure of a fault detection device for a refrigeration device according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0046] In the related technology, when the defrost valve link of the cold storage refrigerator using hot gas defrosting fails, it is basically impossible to intelligently determine what the specific fault is, locate the fault, and analyze the problem. As a result, repeated defrosting is not only useless and wastes energy; it is also easy to cause liquid hammer failure in the system; and the cooling fails, the storage temperature cannot be stabilized, resulting in reduced quality or even damage of the items in the storage.

[0047] Because the defrost solenoid valve cannot open normally, the refrigerant hot gas cannot be used for defrosting, and the following problems will occur:

[0048] A. Because the refrigerant continues to flow through the expansion valve normally, not only can defrosting fail, but frosting becomes more serious;

[0049] B. The temperature inside the warehouse cannot be controlled normally, and the refrigeration system outputs a low-pressure alarm.

[0050] Based on this, the embodiment of the present application adopts two schemes to locate and analyze the faults before and after defrosting respectively, thereby realizing intelligent identification and early warning of faults. At the same time, when a fault occurs, the precise position of the fault can be quickly located and maintenance can be guided.

[0051] The embodiments of the present application provide a refrigeration device fault detection method, device, equipment and storage medium, which can realize intelligent determination of the fault type of the solenoid valve and intelligent location of the cause of the fault.

[0052] The present application provides a method for detecting a fault in a refrigeration device. The refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator. The refrigerant pipeline is connected to the outlet of the compressor, the evaporator and the inlet of the compressor. The solenoid valve is arranged on the refrigerant pipeline between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting. Figure 1 As shown, the method includes:

[0053] Step 101: In response to a defrost instruction, the solenoid valve is controlled to be in an on state, so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts.

[0054] For example, the refrigeration device may be a refrigeration unit for cold chain transportation, and the refrigerant may be a refrigerant. The refrigerant pipeline may be determined according to actual conditions and is not limited here. As an example, the refrigerant pipeline may be a copper tube heat exchanger; the solenoid valve may be determined according to actual conditions and is not limited here. As an example, the solenoid valve may be a defrost solenoid valve.

[0055] In some embodiments, the refrigeration device is also provided with at least one of a high-pressure switch, an oil separator, a regenerator, an auxiliary expansion valve and a low-pressure switch; the high-pressure switch is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the solenoid valve, the oil separator is arranged on the refrigerant pipeline at a position between the high-pressure switch and the solenoid valve, the regenerator is arranged on the refrigerant pipeline at a position between the evaporator and the inlet of the compressor, and the auxiliary expansion valve is arranged on the refrigerant pipeline at a position between the regenerator and the inlet of the compressor; the low-pressure switch is arranged on the refrigerant pipeline at a position between the auxiliary expansion valve and the inlet of the compressor.

[0056] In some embodiments, before controlling the solenoid valve to be in a conducting state in response to a defrost instruction, it is determined whether the defrost link formed by the compressor, the refrigerant pipeline, the solenoid valve and the evaporator is normal. If the defrost link is normal, the solenoid valve is controlled to be in a conducting state based on the defrost instruction; if the defrost link is abnormal, defrost link fault information is output.

[0057] For example, the refrigeration device pre-check can be used to determine whether the defrost link is normal. Specifically, when the refrigeration device is powered on for self-check, the main control board first inputs a high-level signal to the solenoid valve, and detects whether the signal has a corresponding return. If it cannot be connected, it can be determined that the solenoid valve link is faulty. The possible situation is that the solenoid valve coil is disconnected or the circuit is open; at this time, the refrigeration device automatically outputs defrost link fault information. Among them, the main control board can be a microcomputer controller or a programmable logic controller (PLC).

[0058] It can be understood that it is possible to determine whether a defrost command is generated and obtain a first judgment result; when the first judgment result indicates that no defrost command is generated, it is determined whether the solenoid valve is in a normally open state based on the temperature rise parameters between the solenoid valve and the evaporator; when the first judgment result indicates that a defrost command is generated, it is determined whether the solenoid valve is in an off state based on the temperature rise parameters between the solenoid valve and the evaporator.

[0059] Exemplarily, the refrigerant flowing to the evaporator through the solenoid valve can be a high-temperature and high-pressure gas refrigerant, wherein the high-temperature and high-pressure gas refrigerant flows toward the evaporator in the refrigerant pipeline, melts the frost on the surface of the evaporator, and forms a liquid refrigerant, and the liquid refrigerant flows toward the compressor in the refrigerant pipeline.

[0060] In an application example, before controlling the solenoid valve to be in an on state in response to a defrost instruction, the method further includes:

[0061] When no defrost command is generated, a third temperature rise parameter between the solenoid valve and the evaporator is obtained;

[0062] When the third temperature rise parameter satisfies the second condition, it is determined that the solenoid valve is in a third fault state.

[0063] Exemplarily, the second condition may be a temperature condition and / or a time condition for determining whether the solenoid valve is in a conducting state; the third fault state may indicate that the solenoid valve is in a normally open state when there is no defrost instruction.

[0064] It can be understood that the third temperature rise parameter can be the temperature value between the solenoid valve and the evaporator. When the third temperature rise parameter meets the temperature condition, it is determined that the solenoid valve is in the third fault state. The third temperature rise parameter can also be the temperature rise value between the solenoid valve and the evaporator. When the duration of the third temperature rise parameter meets the time condition, it is determined that the solenoid valve is in the third fault state.

[0065] In an application example, the refrigeration device further includes an expansion valve; the expansion valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for refrigeration; the third temperature rise parameter includes at least one of a first temperature value between the solenoid valve and the evaporator at a first preset moment and a second temperature rise value between the solenoid valve and the evaporator per unit time; the second condition includes a temperature condition and / or a time condition for determining whether the solenoid valve is in a conducting state; when the third temperature rise parameter satisfies the second condition, determining that the solenoid valve is in a third fault state includes:

[0066] Acquire a second temperature value between the expansion valve and the evaporator at a first preset time;

[0067] When the difference between the first temperature value and the second temperature value is greater than or equal to the temperature threshold, determining that the solenoid valve is in a third fault state;

[0068] and / or, obtaining a duration during which the second temperature rise value is greater than the fifth temperature rise threshold;

[0069] When the duration is longer than the time threshold, it is determined that the solenoid valve is in the third fault state.

[0070] Exemplarily, a temperature sensor after the solenoid valve can be set between the solenoid valve and the evaporator, and a first temperature parameter between the solenoid valve and the evaporator can be obtained through the temperature sensor after the solenoid valve, wherein the first temperature parameter can be a temperature value, and the first temperature parameter at a first preset moment can be determined as the first temperature value; the second temperature rise value between the solenoid valve and the evaporator can also be determined based on the difference between the first temperature parameter at each moment and the initial moment.

[0071] Exemplarily, a temperature sensor after the expansion valve can be set between the expansion valve and the evaporator, and a second temperature parameter between the expansion valve and the evaporator can be obtained through the temperature sensor after the solenoid valve, where the second temperature parameter can be a temperature value, and the second temperature parameter at the first preset moment can be determined as the second temperature value.

[0072] For example, the first preset time can be determined according to actual conditions, and is not limited here. As an example, the first preset time can be the 10th second after the refrigeration device is turned on.

[0073] For example, the unit time can be determined according to actual conditions and is not limited here. As an example, the unit time refers to a certain time period as a unit within a certain period of time, such as one second within a period of time without a defrost instruction. The second temperature rise value can be determined according to actual conditions and is not limited here. As an example, the second temperature rise value can be the temperature value of the temperature rise between the solenoid valve and the evaporator per unit time.

[0074] In an application example, the method further includes:

[0075] The temperature threshold value range is 3-8°C; the fifth temperature rise threshold value range is 3-8°C; the time threshold value range is 5-50s.

[0076] For example, the temperature threshold can be determined according to actual conditions and is not limited here. As an example, the temperature threshold can be determined according to the sensitivity requirement. When the sensitivity requirement is high, the temperature threshold can be 3°C; when the sensitivity requirement is moderate, the temperature threshold can be 5°C; when the sensitivity requirement is low, the temperature threshold can be 8°C.

[0077] For example, the fifth temperature rise threshold can be determined according to actual conditions and is not limited here. As an example, the fifth temperature rise threshold can be determined according to sensitivity requirements. When the sensitivity requirement is high, the fifth temperature rise threshold can be 3°C; when the sensitivity requirement is moderate, the fifth temperature rise threshold can be 5°C; when the sensitivity requirement is low, the fifth temperature rise threshold can be 8°C.

[0078] For example, the time threshold can be determined according to actual conditions and is not limited here. As an example, the time threshold can be determined according to the sensitivity requirement. When the sensitivity requirement is high, the time threshold can be 5 seconds when no defrost instruction is generated; when the sensitivity requirement is moderate, the time threshold can be 10 seconds when no defrost instruction is generated; when the sensitivity requirement is low, the time threshold can be 50 seconds when no defrost instruction is generated.

[0079] In some embodiments, the refrigeration device is further provided with a three-way valve, one end of which is connected to the expansion valve, the other end is connected to the evaporator, and the other end is connected to the solenoid valve. It is understandable that when a refrigeration instruction is generated, the refrigerant flows through the expansion valve, the three-way valve and the evaporator through the refrigerant pipeline; when a defrost instruction is generated, the refrigerant flows through the solenoid valve, the three-way valve and the evaporator through the refrigerant pipeline, and a small part flows through the expansion valve.

[0080] Step 102: Obtain a first temperature rise parameter between the solenoid valve and the evaporator.

[0081] Exemplarily, a temperature sensor behind the solenoid valve can be set between the solenoid valve and the evaporator, and the first temperature parameter between the solenoid valve and the evaporator can be obtained through the temperature sensor behind the solenoid valve, wherein the first temperature parameter can be a temperature value, and then the temperature rise parameter between the solenoid valve and the evaporator is determined according to the time parameter corresponding to the first temperature parameter. It should be noted that the installation position of the sensor here should be no less than 15cm away from the solenoid valve, the sensor should be close to the copper tube and insulated from the outside air, and it should be located in the low-temperature cold storage box; if it is close to the solenoid valve, deviations may occur due to the high thermal conductivity of the copper tube.

[0082] Step 103: When the first temperature rise parameter satisfies a first condition, determining that the solenoid valve is in a first fault state.

[0083] For example, the first condition may be a temperature condition for determining whether the solenoid valve is in an off state; the first fault state may indicate that the solenoid valve is in an off state when there is a defrost instruction, and the refrigeration device cannot defrost at this time. It is understandable that the first temperature rise parameter may be a temperature value between the solenoid valve and the evaporator, and when the first temperature rise parameter satisfies the temperature condition, it is determined that the solenoid valve is in the first fault state.

[0084] In an application example, the first temperature rise parameter includes at least one of a unit temperature rise value and a first temperature rise value within a third preset time length; the first condition includes at least one of a unit temperature rise value being less than a third temperature rise threshold value and a first temperature rise value being less than a fourth temperature rise threshold value; when the first temperature rise parameter satisfies the first condition, determining that the solenoid valve is in a first fault state includes:

[0085] When the unit temperature rise value is less than the third temperature rise threshold, determining that the solenoid valve is in a first fault state;

[0086] And / or, when the first temperature rise value is less than the fourth temperature rise threshold, it is determined that the solenoid valve is in the first fault state.

[0087] In an application example, the method further includes:

[0088] The value range of the third temperature rise threshold is 1-8°C; the value range of the fourth temperature rise threshold is 10-50°C.

[0089] For example, the unit temperature rise value can be determined according to actual conditions, and is not limited here. As an example, the unit temperature rise value can be the temperature value of the temperature rise between the solenoid valve and the evaporator per second.

[0090] For example, the third temperature rise threshold can be determined according to actual conditions and is not limited here. As an example, it can be determined according to sensitivity requirements. When the sensitivity requirement is high, the third temperature rise threshold can be 1°C; when the sensitivity requirement is moderate, the third temperature rise threshold can be 5°C; when the sensitivity requirement is low, the third temperature rise threshold can be 8°C.

[0091] For example, the third preset time length can be determined according to actual conditions, and is not limited here. As an example, the third preset time length can be a preset execution time of the defrosting operation, specifically, the third preset time length can be 3-10s.

[0092] For example, the first temperature rise value may be determined according to actual conditions, which is not limited here. As an example, the first temperature rise value may be a total temperature value of the temperature rise between the solenoid valve and the evaporator within a preset execution time.

[0093] For example, the fourth temperature rise threshold can be determined according to actual conditions and is not limited here. As an example, it can be determined according to sensitivity requirements. When the sensitivity requirement is high, the fourth temperature rise threshold can be 10°C; when the sensitivity requirement is low, the fourth temperature rise threshold can be 50°C.

[0094] In an application example, when a first temperature rise parameter satisfies a first condition, determining that the solenoid valve is in a first fault state includes:

[0095] When the first temperature rise parameter satisfies the first condition, obtaining a second temperature rise parameter between the evaporator and the compressor in the refrigeration device within a first preset time period;

[0096] When the second temperature rise parameter is less than the first temperature rise threshold, it is determined that the solenoid valve is in a first fault state.

[0097] For example, the second temperature rise parameter can be determined according to actual conditions, and is not limited here. As an example, the second temperature rise parameter can be a temperature value of the temperature rise between the solenoid valve and the evaporator within 10-15 seconds.

[0098] Exemplarily, an evaporator outlet temperature sensor can be set between the evaporator and the compressor, and the second temperature parameter between the evaporator and the compressor can be obtained through the evaporator outlet temperature sensor, and then the second temperature rise parameter between the evaporator and the compressor can be determined according to the first preset time corresponding to the second temperature parameter.

[0099] In an application example, the method further includes:

[0100] When the second temperature rise parameter is greater than or equal to the first temperature rise threshold, it is determined that the solenoid valve is in a second fault state.

[0101] Exemplarily, the second fault state may indicate that there is a misjudgment or sensor failure in the judgment result of the temperature rise parameter between the solenoid valve and the evaporator, and the refrigeration device cannot defrost at this time. In some embodiments, it is possible to re-judge whether the first temperature rise parameter meets the first condition; in other embodiments, an alarm message of the second fault state may be output to prompt the user to inspect the components of the refrigeration device. By performing a secondary judgment on the temperature rise parameter between the evaporator and the compressor, it is possible to avoid misjudgment or sensor failure in the judgment result of the temperature rise parameter between the solenoid valve and the evaporator.

[0102] In an application example, the method further includes:

[0103] The value range of the first preset time length is 10-15S; the value range of the first temperature rise threshold is 3-15°C.

[0104] For example, the first preset duration can be determined according to actual conditions and is not limited here. As an example, the first preset duration can be determined according to sensitivity requirements. When the sensitivity requirement is high, the first preset duration can be 10s; when the sensitivity requirement is low, the first preset duration can be 15s.

[0105] For example, the first temperature rise threshold can be determined according to actual conditions and is not limited here. As an example, the first temperature rise threshold can also be determined according to sensitivity requirements. When the sensitivity requirement is high, the first temperature rise threshold can be 3°C; when the sensitivity requirement is low, the first temperature rise threshold can be 15°C.

[0106] In an application example, after the solenoid valve is in the on state, the method further includes:

[0107] Acquiring a fourth temperature rise parameter between the evaporator and the compressor within a second preset time period; the fourth temperature rise parameter represents a temperature value between the evaporator and the compressor after the second preset time period;

[0108] When the fourth temperature rise parameter is less than the second temperature rise threshold, it is determined that the refrigeration device is in the first defrosting state.

[0109] In an application example, the value range of the second preset time length is 10-40 minutes; the value range of the second temperature rise threshold is 0-4°C.

[0110] For example, the second preset time can be determined according to actual conditions, and is not limited here. As an example, the second preset time can be a preset execution time of the defrost operation, and the second preset time can be determined according to the energy consumption demand of the refrigeration device. Specifically, when the energy consumption demand of the refrigeration device requires low energy consumption, the second preset time can be 10 minutes; when the energy consumption demand of the refrigeration device requires moderate energy consumption, the second preset time can be 30 minutes; when the energy consumption demand of the refrigeration device does not require low energy consumption, the second preset time can be 40 minutes.

[0111] For example, the fourth temperature rise parameter can be determined according to actual conditions and is not limited here. As an example, the fourth temperature rise parameter can be a temperature value to which the temperature between the evaporator and the compressor rises within a preset execution time of 10-40 minutes.

[0112] For example, the second temperature rise threshold can be determined according to actual conditions and is not limited here. As an example, the second temperature rise threshold can also be determined according to sensitivity requirements. When the sensitivity requirement is high, the second temperature rise threshold can be 0°C; when the sensitivity requirement is low, the second temperature rise threshold can be 4°C. The first defrost state can represent the insufficient defrost state of the refrigeration device.

[0113] In some embodiments, when the fourth temperature rise parameter is greater than or equal to the second temperature rise threshold, it is determined that the refrigeration device is in the second defrosting state, wherein the second defrosting state may represent a normal defrosting state of the refrigeration device.

[0114] In some embodiments, a fifth temperature rise parameter inside the evaporator may be obtained, and the fifth temperature rise parameter may be calculated in the same manner as the fourth temperature rise parameter. If the fifth temperature rise parameter is greater than or equal to the second temperature rise threshold, then the fourth temperature rise parameter must be greater than or equal to the second temperature rise threshold.

[0115] Exemplarily, an evaporator middle temperature sensor may be provided in the evaporator, and a third temperature parameter in the evaporator may be obtained through the evaporator middle temperature sensor, and then a fifth temperature rise parameter between the evaporator and the compressor may be determined according to a second preset time corresponding to the third temperature parameter.

[0116] In order to understand the embodiments of the present invention, an intelligent identification method for a defrost solenoid valve fault of a refrigeration unit for cold chain transportation is taken as an example for description.

[0117] The method is applied to a refrigeration unit for cold chain transportation, the composition structure of which is as follows Figure 2 As shown. A defrost circuit is provided in the refrigeration for cold chain transportation, including a compressor 201, a defrost solenoid valve 202, an evaporator 203, a temperature sensor T14 after the solenoid valve, a temperature sensor T07 in the middle of the evaporator, a high-pressure switch P1, an oil separator 204, a regenerator 205, an auxiliary expansion valve 206, and a low-pressure switch P2; the refrigerant flows out of the compressor 201, flows through the high-pressure switch P1, the oil separator 204, the defrost solenoid valve 202, the temperature sensor T14 after the solenoid valve, the evaporator 203, the temperature sensor T06 in the middle of the evaporator, the temperature sensor T07 in the evaporator outlet, the regenerator 205, the auxiliary expansion valve 206, and the low-pressure switch P2, and flows back to the compressor 201. Among them, a small amount of refrigerant in the oil separator 204 flows back to the compressor 201 through the return oil pipe 211.

[0118] A refrigeration circuit is provided in the refrigeration for cold chain transportation, including a compressor 201, a high-pressure switch P1, an oil separator 204, a refrigerator 207, a liquid storage tank 208, a drying filter 209, a sight glass 210, a heat exchanger 205, an expansion valve 211, a temperature sensor T05 after the expansion valve, an evaporator 203, a temperature sensor T06 in the middle of the evaporator, a temperature sensor T07 at the outlet of the evaporator, a defrost expansion valve 206 and a low-pressure switch P2; the refrigerant flows out of the compressor 201, flows through the high-pressure switch P1, the oil separator 204, the refrigerator 207, the liquid storage tank 208, the drying filter 209, the sight glass 210, the heat exchanger 205, the expansion valve 211, a temperature sensor T05 after the expansion valve, the evaporator 203, a temperature sensor T06 in the middle of the evaporator, a temperature sensor T07 at the outlet of the evaporator, the heat exchanger 205, the defrost expansion valve 206 and the low-pressure switch P2, and flows back to the compressor 201.

[0119] The intelligent identification method of defrost solenoid valve failure of refrigeration units for cold chain transportation includes the following three parts:

[0120] Part 1: Method for using refrigeration system pre-inspection to determine whether the defrost link is normal: When the refrigeration system is powered on for self-inspection, the main control board (microcomputer controller or PLC) first inputs a high-level signal to the defrost solenoid valve, and detects whether the signal has a corresponding return. If it cannot be connected, it can be determined that the defrost solenoid valve link is faulty. Possible situations are that the defrost solenoid valve coil is disconnected or the circuit is open; at this time, the electronic control system automatically outputs defrost link fault information.

[0121] Part 2: If there is no fault in the self-check, start defrosting after turning on the machine. After turning on the defrost solenoid valve, detect the data change trend of the three sensors, and analyze the three states of unable to defrost, insufficient defrost and normal defrost. The characteristic temperatures of the three sensors are the temperature after the solenoid valve T14, the middle temperature of the evaporator T6 and the evaporator outlet temperature T7 (generally the default is the core parameter for controlling the termination of defrost here).

[0122] By comparing the changes in the three characteristic temperatures in the defrost link, the fault condition can be found:

[0123] If the temperature behind the solenoid valve does not rise rapidly (for example, the temperature rise is greater than 5°C per second and the maximum temperature rise is greater than 10°C, the parameters of the maximum temperature rise and the temperature rise can be set, and the typical values ​​are shown here), the solenoid valve is in a short circuit (not open), and the refrigeration device cannot defrost.

[0124] In order to avoid misjudgment or sensor failure, the middle temperature T6 of the evaporator or the outlet temperature T7 of the evaporator can be increased for comparative analysis. Within 10-15S, it is determined whether the temperature rise of the middle temperature T6 of the evaporator or the outlet temperature T7 of the evaporator is greater than 3°C (settable). If such temperature change does not occur, it can also be determined that the solenoid valve fails to open normally (is in an open circuit); if such temperature change occurs, it is determined to be a misjudgment or sensor failure, and an alarm message can be output, or the temperature behind the solenoid valve can be re-determined.

[0125] Whether the evaporator middle temperature T6 or the evaporator outlet temperature T7 rises to 4°C within half an hour, if yes, it is considered that defrosting is normal; if not, it is considered that defrosting is insufficient. Among them, if the evaporator middle temperature T6 rises to 4°C, the evaporator outlet temperature T7 must also rise to 4°C. However, some refrigeration devices may not be equipped with an evaporator middle temperature sensor T6.

[0126] Part 3: In the absence of a defrost command, there is no need to open the defrost solenoid valve, but the defrost link is continuously open, and the solenoid valve is in a normally open fault state (not closed). The system can analyze the fault in advance through the temperature after the solenoid valve is significantly higher than the temperature before / after the expansion valve. The fault can be determined by comparing any of the following state differences: a. 10 seconds after the refrigeration is turned on, the temperature after the expansion valve is detected to be T5≤T14-5℃ (this parameter can be set); b. T14 is in a non-defrosting working state, and the temperature rises by more than 3℃ (this parameter can be set) for more than 10 seconds.

[0127] Through the technical solution of the embodiment of the present application, the false alarm of the refrigeration device can be reduced, the recognition rate can be increased, and the reliability can be improved; further intelligent improvement and improved ease of use can be achieved.

[0128] The present application provides a fault detection device for a refrigeration device, wherein the refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator, wherein the refrigerant pipeline is connected to the outlet of the compressor, the evaporator and the inlet of the compressor, and the solenoid valve is arranged on the refrigerant pipeline between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting. Figure 3 As shown, the fault detection device 300 of the refrigeration device includes:

[0129] The first control module 301 is used to control the solenoid valve to be in a conducting state in response to the defrost instruction, so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts;

[0130] A first acquisition module 302, used to acquire a first temperature rise parameter between the solenoid valve and the evaporator;

[0131] The first determination module 303 is configured to determine that the solenoid valve is in a first fault state when the first temperature rise parameter satisfies a first condition.

[0132] In some embodiments, the first determination module 303 is also used to obtain a second temperature rise parameter between the evaporator and the compressor in the refrigeration device within a first preset time period when the first temperature rise parameter meets the first condition; and determine that the solenoid valve is in a first fault state when the second temperature rise parameter is less than the first temperature rise threshold.

[0133] In some embodiments, the first determination module 303 is further configured to determine that the solenoid valve is in a second fault state when the second temperature rise parameter is greater than or equal to the first temperature rise threshold.

[0134] In some embodiments, the first preset time duration ranges from 10 to 15 seconds; the first temperature rise threshold ranges from 3 to 15°C.

[0135] In some embodiments, when a defrost instruction is generated, before the solenoid valve is controlled to be in a conducting state based on the defrost instruction, the fault detection device 300 of the refrigeration device further includes:

[0136] A second acquisition module is used to acquire a third temperature rise parameter between the solenoid valve and the evaporator when no defrost instruction is generated;

[0137] The second determination module is used to determine that the solenoid valve is in a third fault state when the third temperature rise parameter meets the second condition.

[0138] In some embodiments, after the solenoid valve is in the on state, the refrigeration device fault detection device 300 further includes:

[0139] A third acquisition module is used to acquire a fourth temperature rise parameter between the evaporator and the compressor within a second preset time period; the fourth temperature rise parameter represents a temperature value between the evaporator and the compressor after the second preset time period;

[0140] The third determination module is used to determine that the refrigeration device is in the first defrosting state when the fourth temperature rise parameter is less than the second temperature rise threshold.

[0141] In some embodiments, the second preset time period ranges from 10 to 40 minutes; the second temperature rise threshold ranges from 0 to 4°C.

[0142] In some embodiments, the first temperature rise parameter includes at least one of a unit temperature rise value and a first temperature rise value within a third preset time length; the first condition includes at least one of a unit temperature rise value being less than a third temperature rise threshold and a first temperature rise value being less than a fourth temperature rise threshold; the first determination module 303 is also used to determine that the solenoid valve is in a first fault state when the unit temperature rise value is less than the third temperature rise threshold; and / or, when the first temperature rise value is less than the fourth temperature rise threshold, determine that the solenoid valve is in a first fault state.

[0143] In some embodiments, the third temperature rise threshold value ranges from 1 to 8°C; the fourth temperature rise threshold value ranges from 10 to 50°C.

[0144] In some embodiments, the refrigeration device also includes an expansion valve; the expansion valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for refrigeration; the third temperature rise parameter includes at least one of a first temperature value between the solenoid valve and the evaporator at a first preset moment and a second temperature rise value between the solenoid valve and the evaporator per unit time; the second condition includes a temperature condition and / or a time condition for determining whether the solenoid valve is in a conductive state; the second determination module is also used to obtain the second temperature value between the expansion valve and the evaporator at the first preset moment; when the difference between the first temperature value and the second temperature value is greater than or equal to the temperature threshold, it is determined that the solenoid valve is in the third fault state; and / or, the duration of the second temperature rise value is obtained; when the duration is greater than the time threshold, it is determined that the solenoid valve is in the third fault state.

[0145] In some embodiments, the temperature threshold value ranges from 3 to 8° C.; the fifth temperature rise threshold value ranges from 3 to 8° C.; and the time threshold value ranges from 5 to 50 seconds.

[0146] It should be noted that: the fault detection device for the refrigeration device provided in the above embodiment only uses the division of the above program modules as an example when performing control. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the fault detection device for the refrigeration device provided in the above embodiment and the aforementioned fault detection method embodiment of the refrigeration device belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0147] Based on the hardware implementation of the above program modules, and in order to implement the method of the embodiment of the present application, the embodiment of the present application also provides a fault detection device for a refrigeration device. Figure 4 Only an exemplary structure of the fault detection device of the refrigeration device is shown, not all structures, and can be implemented as needed. Figure 4 Partial or complete structure shown.

[0148] like Figure 4 As shown, the refrigeration device fault detection device 400 provided in the embodiment of the present application includes: at least one processor 401, a memory 402 and a user interface 403. The various components in the refrigeration device fault detection device 400 are coupled together through a bus system 404. It can be understood that the bus system 404 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 404 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, in Figure 4 Various buses are labeled as bus system 404 .

[0149] The user interface 403 may include a display, a keyboard, a mouse, a trackball, a click wheel, keys, buttons, a touch pad or a touch screen.

[0150] The memory 402 in the embodiment of the present application is used to store various types of data to support the operation of the control device. Examples of such data include: any computer program used to operate on the control device.

[0151] The fault detection method for a refrigeration device disclosed in the embodiment of the present application can be applied to a processor 401, or implemented by a processor 401. The processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the fault detection method for a refrigeration device can be completed by an integrated logic circuit of hardware or software instructions in the processor 401. The above-mentioned processor 401 may be a general-purpose processor, a digital signal processor (DSP, DigitalSignal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 401 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiment of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, which is located in the memory 402, and the processor 401 reads the information in the memory 402, and completes the steps of the fault detection method for a refrigeration device provided in the embodiment of the present application in combination with its hardware.

[0152] In an exemplary embodiment, the fault detection device of the refrigeration unit can be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD), field programmable gate array (FPGA), general processor, controller, microcontroller (MCU), microprocessor, or other electronic components to execute the aforementioned method.

[0153] It can be understood that the memory 402 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disk, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), and direct RAM bus random access memory (DRRAM, Direct Rambus Random Access Memory).The memories described in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0154] In an exemplary embodiment, the present application also provides a storage medium, namely a computer storage medium, which can be a computer-readable storage medium, for example, a memory 402 storing a computer program, and the computer program can be executed by a processor 401 of a fault detection device of a refrigeration device to complete the steps described in the method of the present application embodiment. The computer-readable storage medium can be a memory such as a ROM, a PROM, an EPROM, an EEPROM, a Flash Memory, a magnetic surface memory, an optical disk, or a CD-ROM.

[0155] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0156] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0157] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for detecting a fault in a refrigeration device, characterized in that: The refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator, the refrigerant pipeline connects the outlet of the compressor, the evaporator and the inlet of the compressor, the solenoid valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting, and the method includes: In response to a defrost instruction, the solenoid valve is controlled to be in a conducting state, so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts; Acquiring a first temperature rise parameter between the solenoid valve and the evaporator; When the first temperature rise parameter satisfies a first condition, it is determined that the solenoid valve is in a first fault state.

2. The method according to claim 1, characterized in that The step of determining that the solenoid valve is in a first fault state when the first temperature rise parameter satisfies a first condition includes: When the first temperature rise parameter satisfies the first condition, obtaining a second temperature rise parameter between the evaporator and the compressor in the refrigeration device within a first preset time period; When the second temperature rise parameter is less than the first temperature rise threshold, it is determined that the solenoid valve is in the first fault state.

3. The method according to claim 2, characterized in that The method further comprises: When the second temperature rise parameter is greater than or equal to the first temperature rise threshold, it is determined that the solenoid valve is in a second fault state.

4. The method according to claim 2 or 3, characterized in that: The value range of the first preset time length is 10-15 seconds; the value range of the first temperature rise threshold is 3-15°C.

5. The method according to claim 1, characterized in that Before controlling the solenoid valve to be in an on state in response to the defrost instruction, the method further includes: When the defrost instruction is not generated, obtaining a third temperature rise parameter between the solenoid valve and the evaporator; When the third temperature rise parameter satisfies the second condition, it is determined that the solenoid valve is in a third fault state.

6. The method according to claim 1, characterized in that After the solenoid valve is in the on state, the method further includes: Acquiring a fourth temperature rise parameter between the evaporator and the compressor within a second preset time period; the fourth temperature rise parameter represents a temperature value between the evaporator and the compressor after the second preset time period; When the fourth temperature rise parameter is less than the second temperature rise threshold, it is determined that the refrigeration device is in the first defrosting state.

7. The method according to claim 6, characterized in that The value range of the second preset time length is 10-40 minutes; the value range of the second temperature rise threshold is 0-4°C.

8. The method according to claim 1, characterized in that The first temperature rise parameter includes at least one of a unit temperature rise value and a first temperature rise value within a third preset time period; the first condition includes at least one of the unit temperature rise value being less than a third temperature rise threshold value and the first temperature rise value being less than a fourth temperature rise threshold value; when the first temperature rise parameter satisfies the first condition, determining that the solenoid valve is in a first fault state includes: When the unit temperature rise value is less than the third temperature rise threshold, determining that the solenoid valve is in a first fault state; And / or, when the first temperature rise value is less than the fourth temperature rise threshold, it is determined that the solenoid valve is in a first fault state.

9. The method according to claim 8, characterized in that The third temperature rise threshold has a value range of 1-8°C; the fourth temperature rise threshold has a value range of 10-50°C.

10. The method according to claim 5, characterized in that The refrigeration device also includes an expansion valve; the expansion valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for refrigeration; the third temperature rise parameter includes at least one of a first temperature value between the solenoid valve and the evaporator at a first preset moment and a second temperature rise value between the solenoid valve and the evaporator per unit time; the second condition includes a temperature condition and / or a time condition for determining whether the solenoid valve is in a conducting state; When the third temperature rise parameter satisfies the second condition, determining that the solenoid valve is in the third fault state includes: Acquire a second temperature value between the expansion valve and the evaporator at the first preset time; When the difference between the first temperature value and the second temperature value is greater than or equal to a temperature threshold, determining that the solenoid valve is in a third fault state; And / or, obtaining a duration during which the second temperature rise value is greater than a fifth temperature rise threshold; When the duration is greater than a time threshold, it is determined that the solenoid valve is in a third fault state.

11. The method according to claim 10, characterized in that The temperature threshold value ranges from 3 to 8° C.; the fifth temperature rise threshold value ranges from 3 to 8° C.; and the time threshold value ranges from 5 to 50 seconds.

12. A fault detection device for a refrigeration device, characterized in that: The refrigeration device is provided with a compressor, a refrigerant pipeline, a solenoid valve and an evaporator, the refrigerant pipeline connects the outlet of the compressor, the evaporator and the inlet of the compressor, the solenoid valve is arranged on the refrigerant pipeline at a position between the outlet of the compressor and the evaporator, and is used to control the refrigerant in the refrigerant pipeline to flow through the evaporator for defrosting, and the fault detection device includes: A first control module, configured to control the solenoid valve to be in a conducting state in response to a defrost instruction, so that the refrigerant in the compressor flows to the evaporator through the solenoid valve, and the frost on the surface of the evaporator melts; A first acquisition module, used to acquire a first temperature rise parameter between the solenoid valve and the evaporator; The first determination module is used to determine that the solenoid valve is in a first fault state when the first temperature rise parameter meets a first condition.

13. A refrigeration device fault detection device, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 11 is implemented.

14. A storage medium, characterized in that: The storage medium stores executable instructions, and when the executable instructions are executed by a processor, the method according to any one of claims 1 to 11 is implemented.

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