Fault judgment method, device, medium and equipment of refrigeration system

Abstract

The present disclosure relates to a fault determination method, device, medium and equipment for a refrigeration system, the refrigeration system comprising a compressor; the fault determination method comprising: obtaining an exhaust temperature of the compressor and an ambient temperature at which the refrigeration system operates; determining that the refrigeration system is faulty based on the exhaust temperature and the ambient temperature satisfying a preset condition. In this way, whether the refrigeration system is faulty is determined by the exhaust temperature and the ambient temperature, the fault determination of the refrigeration system can be performed in advance before the temperature in the box rises, and an alarm can be issued when the refrigeration system is faulty, so that the alarm is issued in advance, and the risk of damage to the items in the box is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of refrigeration equipment technology, and in particular to a method, apparatus, medium and equipment for diagnosing faults in a refrigeration system. Background Technology

[0002] Refrigeration equipment, such as refrigerators, uses a refrigeration system to maintain a constant low temperature inside the cabinet in order to store food or other items.

[0003] In related technologies, if a refrigeration system malfunctions, an alarm is typically triggered only after the internal temperature rises to the alarm limit. This delay in alarm notification is problematic for items requiring precise temperature preservation, such as fine wines, food ingredients, vaccines, and biological samples. Furthermore, the high internal temperature can potentially damage these items. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this disclosure provides a method, apparatus, medium and equipment for diagnosing faults in a refrigeration system.

[0005] This disclosure provides a method for diagnosing faults in a refrigeration system, the refrigeration system including a compressor; the method for diagnosing faults in the refrigeration system includes:

[0006] Obtain the discharge temperature of the compressor and the ambient temperature at which the refrigeration system operates;

[0007] Based on the fact that the exhaust temperature and the ambient temperature meet preset conditions, the refrigeration system is determined to be faulty.

[0008] Optionally, determining a refrigeration system fault based on the exhaust temperature and the ambient temperature meeting preset conditions includes:

[0009] The comparison result is obtained based on the comparison between the exhaust temperature and the ambient temperature;

[0010] Based on the comparison results meeting preset conditions, the refrigeration system is determined to be faulty.

[0011] Optionally, obtaining the comparison result based on the exhaust temperature and the ambient temperature includes:

[0012] The temperature difference is obtained by subtracting the ambient temperature from the exhaust temperature.

[0013] The temperature difference is used as the comparison result.

[0014] Optionally, determining the refrigeration system fault based on the comparison result meeting preset conditions includes:

[0015] The refrigeration system is determined to be faulty based on the temperature difference being less than or equal to a first temperature difference threshold, or the temperature difference being greater than or equal to a second temperature difference threshold.

[0016] Wherein, the second temperature difference threshold is greater than the first temperature difference threshold.

[0017] Optionally, the fault diagnosis method for the refrigeration system further includes:

[0018] Based on the temperature difference being less than or equal to the first temperature difference threshold, the refrigeration system fault is determined to be a compressor fault and / or a refrigerant leakage fault.

[0019] Alternatively, based on the temperature difference being greater than or equal to a second temperature difference threshold, the refrigeration system fault is determined to be at least one of the following: filter clogging, air intake blockage, air outlet blockage, and condenser fan failure.

[0020] Optionally, the fault diagnosis method for the refrigeration system further includes:

[0021] For the variable frequency compressor, the compressor speed is obtained;

[0022] Based on the rotational speed and / or the ambient temperature, obtain the first temperature difference threshold and the second temperature difference threshold.

[0023] Optionally, obtaining the discharge temperature of the compressor and the ambient temperature at which the refrigeration system operates includes:

[0024] The exhaust temperature is obtained based on the exhaust temperature acquisition component, and the ambient temperature is obtained based on the ambient temperature acquisition component; wherein, the exhaust temperature acquisition component is located at the inlet of the condenser connected to the compressor, and the ambient temperature acquisition component is located in the environment in which the refrigeration system operates.

[0025] This disclosure also provides a fault diagnosis device for a refrigeration system, the refrigeration system including a compressor; the fault diagnosis device for the refrigeration system includes:

[0026] A temperature acquisition module is used to acquire the exhaust temperature of the compressor and the ambient temperature at which the refrigeration system operates.

[0027] The fault determination module is used to determine the fault of the refrigeration system based on the fact that the exhaust temperature and the ambient temperature meet preset conditions.

[0028] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the steps of any of the above-described fault diagnosis methods for a refrigeration system.

[0029] This disclosure also provides an apparatus including a memory and a processor;

[0030] The memory stores executable programs or instructions;

[0031] The processor executes the program or instructions to implement the steps of any of the above-described methods for diagnosing faults in a refrigeration system.

[0032] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0033] The fault diagnosis method for the refrigeration system provided in this disclosure obtains the discharge temperature of the compressor and the ambient temperature at which the refrigeration system operates; based on the fact that the discharge temperature and ambient temperature meet preset conditions, the refrigeration system fault is determined. It can determine whether the refrigeration system is faulty by the discharge temperature and ambient temperature, can perform fault diagnosis of the refrigeration system in advance before the temperature inside the box rises, and can issue an alarm when the refrigeration system is faulty, thereby issuing an alarm in advance and reducing the risk of damage to the items inside the box. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0035] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A flowchart illustrating a fault diagnosis method for a refrigeration system provided in this embodiment of the present disclosure;

[0037] Figure 2 This is a schematic diagram of the structure of a fault diagnosis device for a refrigeration system provided in an embodiment of the present disclosure;

[0038] Figure 3 This is a schematic diagram of the structure of a device provided in an embodiment of the present disclosure. Detailed Implementation

[0039] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0040] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0041] The technical solution provided in this disclosure is applicable to a refrigeration system including a compressor. This refrigeration system can be housed within a refrigerator and includes a compressor, a condenser, an evaporator, and a fan. The compressor provides power for the refrigerator's refrigeration cycle, compressing a low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant gas. The condenser condenses and dissipates heat from the high-temperature, high-pressure refrigerant gas, cooling it into a room-temperature, high-pressure refrigerant liquid. The evaporator evaporates and absorbs heat from the room-temperature, high-pressure refrigerant liquid, vaporizing it into a low-temperature, low-pressure gas. The fan allows air to enter the refrigerator's evaporator for heat exchange and then delivers the heated air to the refrigerator compartment.

[0042] For fault diagnosis of this refrigeration system, an exhaust temperature acquisition component and an ambient temperature acquisition component can be set up. The exhaust temperature acquisition component is located at the inlet of the condenser connected to the compressor to avoid the influence of the compressor's own temperature on the exhaust temperature. The ambient temperature acquisition component is located in the environment in which the refrigeration system operates, so as to collect the exhaust temperature and ambient temperature based on the exhaust temperature acquisition component and the ambient temperature acquisition component, respectively.

[0043] The refrigeration system fault diagnosis method provided in this disclosure acquires the exhaust temperature and ambient temperature, and performs fault diagnosis based on these temperatures. This allows the refrigeration system to be diagnosed as faulty by measuring the exhaust temperature and ambient temperature. It enables early fault diagnosis of the refrigeration system before the temperature inside the refrigerator rises, and can issue an alarm when the refrigeration system malfunctions. This early alarm reduces the risk of damage to items inside the refrigerator and helps protect the items stored inside.

[0044] The following description, in conjunction with the accompanying drawings, provides an exemplary account of the fault diagnosis method, apparatus, medium, and equipment for a refrigeration system provided in the embodiments of this disclosure.

[0045] Figure 1 This is a flowchart illustrating a fault diagnosis method for a refrigeration system provided in an embodiment of this disclosure. The refrigeration system to which this fault diagnosis method is applicable includes at least a compressor. This fault diagnosis method can be executed by a fault diagnosis device, such as the controller of the refrigeration system. The fault diagnosis device can be implemented in software and / or hardware. (Refer to...) Figure 1 The fault diagnosis method may include the following steps:

[0046] S110: Obtain the compressor's discharge temperature and the ambient temperature at which the refrigeration system operates.

[0047] The compressor, driven by an electric motor, powers the refrigerant circulation in the refrigeration system. It continuously rotates and extracts vapor from the evaporator, maintaining its low temperature and pressure. The compressor also increases the pressure and temperature of the refrigerant vapor through compression, creating conditions for transferring heat from the vapor to the external environment. The compressor's discharge temperature characterizes the temperature of the high-pressure, high-temperature refrigerant vapor discharged from the compressor. This discharge temperature is collected by a temperature acquisition unit and transmitted to a fault diagnosis device; correspondingly, the fault diagnosis device acquires this discharge temperature.

[0048] Among them, the ambient temperature is the temperature of the environment in which the refrigeration system operates, which can be understood as the temperature of the refrigerator's working environment. This ambient temperature can be collected by a temperature acquisition component set in the refrigerator's working environment and transmitted to the fault diagnosis device; correspondingly, the fault diagnosis device acquires this ambient temperature.

[0049] In some embodiments, the fault diagnosis device may passively receive exhaust temperature and ambient temperature, or it may actively acquire them, for example, by acquiring exhaust temperature and ambient temperature based on data extraction instructions, which is not limited here.

[0050] In some embodiments, the fault diagnosis device may acquire the exhaust temperature and ambient temperature in real time, or it may acquire the exhaust temperature and ambient temperature at preset intervals based on the requirements of the fault diagnosis method or at a time point when the refrigeration system has been running for a preset duration, which is not limited here.

[0051] In some embodiments, the fault diagnosis device may acquire exhaust temperature and ambient temperature simultaneously, or it may acquire exhaust temperature and ambient temperature separately; this is not limited here.

[0052] In some embodiments, a temperature acquisition component can be provided for fault diagnosis of the refrigeration system. The temperature acquisition component may be a temperature sensor, a temperature and humidity sensor, or other structural components with temperature acquisition function, which are not limited here.

[0053] Based on this, the compressor's discharge temperature and the ambient temperature at which the refrigeration system operates are obtained, specifically including:

[0054] The exhaust temperature is obtained based on the exhaust temperature acquisition component, and the ambient temperature is obtained based on the ambient temperature acquisition component; wherein, the exhaust temperature acquisition component is located at the inlet of the condenser connected to the compressor, and the ambient temperature acquisition component is located in the environment in which the refrigeration system operates.

[0055] The exhaust temperature acquisition component collects the exhaust temperature and transmits it to the fault diagnosis device, allowing the device to obtain this temperature. Located at the inlet of the condenser connected to the compressor, the exhaust temperature acquisition component maintains a certain distance from the compressor's exhaust port. This minimizes interference from the compressor casing temperature when a refrigeration system malfunctions, reducing the impact of the compressor casing's temperature on the acquisition component and thus improving the accuracy of refrigeration system fault diagnosis.

[0056] The ambient temperature acquisition component collects the ambient temperature and transmits it to the fault diagnosis device, allowing the fault diagnosis device to obtain the ambient temperature. For example, when the refrigeration equipment is placed indoors, the ambient temperature can be used. In other embodiments, when the refrigeration equipment is placed in other environments, the ambient temperature can be collected by the ambient temperature acquisition component.

[0057] It should be noted that the exhaust temperature acquisition component and the ambient temperature acquisition component may be the same or different, and this is not limited here.

[0058] S120. Based on the fact that the exhaust temperature and ambient temperature meet the preset conditions, the refrigeration system fault is determined.

[0059] The preset conditions are used to determine if the refrigeration system is malfunctioning. If the exhaust temperature and ambient temperature meet the preset conditions, the refrigeration system is considered malfunctioning; if the exhaust temperature and ambient temperature do not meet the preset conditions, the refrigeration system is considered normal.

[0060] Specifically, when the refrigeration system is operating normally, the compressor discharges high-pressure, high-temperature refrigerant vapor, and there is a significant temperature difference between the discharge temperature and the ambient temperature. If the refrigeration system malfunctions, the temperature of the refrigerant vapor discharged by the compressor will change, and the temperature difference between the discharge temperature and the ambient temperature will also change, potentially becoming larger or smaller. This change can be used to determine if the refrigeration system is faulty. Therefore, the aforementioned preset conditions can be set based on this, as detailed below.

[0061] The refrigeration system fault diagnosis method provided in this embodiment obtains the compressor's exhaust temperature and the ambient temperature at which the refrigeration system operates; based on the exhaust temperature and ambient temperature meeting preset conditions, a refrigeration system fault is determined. This method can determine whether the refrigeration system is faulty by using the exhaust temperature and ambient temperature, enabling fault diagnosis of the refrigeration system before the temperature inside the box rises, and issuing an alarm when the refrigeration system is faulty, thereby issuing an alarm in advance and reducing the risk of damage to items inside the box.

[0062] In some embodiments, a refrigeration system fault is determined based on the fact that the exhaust temperature and ambient temperature meet preset conditions, which may specifically include:

[0063] The comparison results are obtained by comparing exhaust temperature and ambient temperature.

[0064] Based on the comparison results meeting the preset conditions, the refrigeration system fault is determined.

[0065] The comparison result is obtained by comparing the exhaust temperature and the ambient temperature. For example, the temperature comparison can be achieved by subtraction or ratio, as detailed later.

[0066] In cases of refrigeration system failure, the comparison between ambient temperature and exhaust temperature differs from the comparison under normal operating conditions. Therefore, in the step of determining whether the refrigeration system is faulty based on exhaust temperature and ambient temperature, the exhaust temperature can be compared with the ambient temperature, and the refrigeration system can be judged based on whether the comparison result meets preset conditions, thus providing a more accurate assessment of whether the refrigeration system is faulty.

[0067] In some embodiments, the comparison result is obtained based on the comparison between exhaust temperature and ambient temperature, which may specifically include:

[0068] The temperature difference is obtained by subtracting the ambient temperature from the exhaust temperature.

[0069] The temperature difference is used as the comparison result.

[0070] In the case of a refrigeration system failure, the temperature difference between the exhaust temperature and the ambient temperature differs from the temperature difference under normal refrigeration system operation. For example, the temperature difference under refrigeration system failure may be larger or smaller than the temperature difference under normal refrigeration system operation. Based on this, using the temperature difference as a comparison result to determine whether the refrigeration system is faulty can more accurately determine whether the refrigeration system is faulty. Moreover, the data processing method is simple, the processing time is short, and it is conducive to timely fault alarm.

[0071] In some embodiments, a refrigeration system fault is determined based on the comparison results meeting preset conditions, which may specifically include:

[0072] A refrigeration system fault is determined based on a temperature difference that is less than or equal to a first temperature difference threshold, or a temperature difference that is greater than or equal to a second temperature difference threshold.

[0073] Wherein, the second temperature difference threshold is greater than the first temperature difference threshold, and the specific value of the second temperature difference threshold is not limited in the embodiments of this disclosure.

[0074] The first and second temperature difference thresholds are used to determine whether the refrigeration system is malfunctioning. When the temperature difference exceeds these thresholds, the refrigeration system is determined to be malfunctioning. Specifically, the refrigeration system is determined to be malfunctioning when the temperature difference is less than or equal to the first temperature difference threshold (i.e., the temperature difference between the exhaust temperature and the ambient temperature decreases) or when the temperature difference is greater than or equal to the second temperature difference threshold (i.e., the temperature difference between the exhaust temperature and the ambient temperature increases). This method of determining refrigeration system malfunctions based on the comparison between the temperature difference and the temperature difference thresholds is simple, highly accurate, and conducive to timely fault alarms.

[0075] In some embodiments, if the temperature difference between the exhaust temperature and the ambient temperature is greater than a first temperature difference threshold and less than a second temperature difference threshold, the refrigeration system can be determined to be operating normally. Specifically, during normal operation of the refrigeration system, the compressor discharges high-temperature, high-pressure refrigerant vapor, resulting in a relatively large temperature difference between the exhaust temperature and the ambient temperature, which is neither too large nor too small. Therefore, based on the temperature difference falling between the first and second temperature difference thresholds, the refrigeration system can be determined to be operating normally.

[0076] In some embodiments, the fault diagnosis method for the refrigeration system may further include:

[0077] Based on the temperature difference being less than or equal to the first temperature difference threshold, the refrigeration system fault is determined to be a compressor fault and / or a refrigerant leakage fault.

[0078] Alternatively, based on a temperature difference greater than or equal to a second temperature difference threshold, the refrigeration system fault is determined to be at least one of the following: filter blockage, air intake blockage, air outlet blockage, and condenser fan failure.

[0079] When the compressor itself malfunctions and operates abnormally, such as due to compressor winding abnormalities, valve plate breakage, crankshaft connecting rod wear, cylinder seizure, or other inherent faults, the compressor either fails to discharge or discharges at a low temperature, resulting in a small or no temperature difference between the discharge temperature and the ambient temperature. Alternatively, in the event of a refrigerant leak in the refrigeration system, the temperature difference between the discharge temperature and the ambient temperature will also decrease. Therefore, when the temperature difference decreases, i.e., when the temperature difference is less than or equal to the first temperature difference threshold, it can be determined that the refrigeration system fault is specifically a compressor malfunction, a refrigerant leak, or both, facilitating fault location and troubleshooting.

[0080] For compressors or condensers requiring fan cooling, increased airflow resistance (e.g., clogged filters, blocked air inlets or outlets, such as when obstructed by objects), or a malfunction in the cooling condenser fan, leads to poor heat dissipation. In such cases, there is little or no temperature difference between the exhaust temperature and the ambient temperature. Therefore, when the temperature difference increases—that is, when it is greater than or equal to a second temperature difference threshold—the refrigeration system malfunction can be identified as at least one of the following: clogged filters, blocked air inlets, blocked air outlets, or a malfunction in the cooling condenser fan. This facilitates troubleshooting and location when a refrigeration system failure occurs.

[0081] In some embodiments, the fault diagnosis method for the refrigeration system may further include:

[0082] For variable frequency compressors, obtain the compressor speed;

[0083] Based on ambient temperature, a first temperature difference threshold and a second temperature difference threshold are obtained; or based on rotational speed, a first temperature difference threshold and a second temperature difference threshold are obtained; or based on rotational speed and ambient temperature, a first temperature difference threshold and a second temperature difference threshold are obtained.

[0084] The variable frequency compressor operates at a variable frequency. For example, the operating frequency of the variable frequency compressor ranges from 1800 rpm to 4500 rpm, and for example, low speed and high speed can be distinguished by a 3000 rpm boundary. Specifically, 1800 rpm to 3000 rpm (inclusive) is considered low speed, and 3000 rpm (exclusive) to 4500 rpm is considered high speed. The temperature difference threshold between the exhaust temperature and the ambient temperature corresponding to normal operation of the refrigeration system differs under low-speed and high-speed operation conditions. Temperature difference thresholds can be set separately for low speed and high speed. For example, a first temperature difference threshold and a second temperature difference threshold can be set for low speed, and a first temperature difference threshold and a second temperature difference threshold can be set for high speed, to accurately determine whether a refrigeration system malfunction occurs during low-speed and high-speed operation.

[0085] Based on this, in the fault diagnosis method of the refrigeration system, the rotational speed of the variable frequency compressor can be obtained first, and the first temperature difference threshold and the second temperature difference threshold corresponding to the rotational speed can be obtained. The temperature difference between the exhaust temperature and the ambient temperature can be compared with the first temperature difference threshold and the second temperature difference threshold to determine whether the refrigeration system is faulty, thereby improving the accuracy of fault diagnosis of the refrigeration system under different compressor speeds.

[0086] For refrigeration systems that are applicable to a wide range of ambient temperatures, such as 5°C to 43°C, the temperature difference threshold between the exhaust temperature and the ambient temperature is different when the refrigeration system is operating normally at high and low ambient temperatures. A first temperature difference threshold and a second temperature difference threshold can be set for different ambient temperatures to accurately determine whether the refrigeration system has malfunctioned during operation at different ambient temperatures.

[0087] Based on this, in the fault diagnosis method of the refrigeration system, a first temperature difference threshold and a second temperature difference threshold corresponding to the acquired ambient temperature can be obtained. The temperature difference between the exhaust temperature and the ambient temperature can be compared with the first temperature difference threshold and the second temperature difference threshold to determine whether the refrigeration system is faulty, thereby improving the accuracy of refrigeration system fault diagnosis under different ambient temperatures.

[0088] For example, the temperature range of 43°C to 5°C can be divided into four different temperature ranges: 43°C to 32°C (excluding 32°C, which will be described as the 43°C ambient temperature range below), 32°C to 25°C (excluding 25°C, which will be described as the 32°C ambient temperature range below), 25°C to 10°C (excluding 10°C, which will be described as the 25°C ambient temperature range below), and 10°C to 5°C (which will be described as the 10°C ambient temperature range below).

[0089] For an ambient temperature range of 43℃, the first temperature difference threshold is 40℃ and the second temperature difference threshold is 60℃. That is, when the temperature difference between the exhaust temperature and the ambient temperature is less than or equal to 40℃ or greater than or equal to 60℃, the refrigeration system is determined to be faulty and an "abnormal refrigeration system" alarm can be issued.

[0090] For an ambient temperature range of 32℃, the first temperature difference threshold is 35℃ and the second temperature difference threshold is 50℃. That is, when the temperature difference between the exhaust temperature and the ambient temperature is less than or equal to 35℃ or greater than or equal to 50℃, the refrigeration system is determined to be faulty and an "abnormal refrigeration system" alarm can be issued.

[0091] For the 25℃ ambient temperature zone, the first temperature difference threshold is 30℃ and the second temperature difference threshold is 45℃. That is, when the temperature difference between the exhaust temperature and the ambient temperature is less than or equal to 30℃ or greater than or equal to 45℃, the refrigeration system is determined to be faulty and an "abnormal refrigeration system" alarm can be issued.

[0092] For a 10℃ ambient temperature range, the first temperature difference threshold is 25℃ and the second temperature difference threshold is 40℃. That is, when the temperature difference between the exhaust temperature and the ambient temperature is less than or equal to 25℃ or greater than or equal to 40℃, the refrigeration system is determined to be faulty and an "abnormal refrigeration system" alarm can be issued.

[0093] For refrigeration systems applicable to a wide temperature range and equipped with variable frequency compressors, corresponding first and second temperature difference thresholds can be set according to different speeds and ambient temperatures to accurately determine whether a malfunction occurs during the operation of the refrigeration system under different ambient temperatures and speeds.

[0094] Based on this, in the fault diagnosis method of the refrigeration system, the ambient temperature and the speed of the variable frequency compressor can be obtained first, and the first temperature difference threshold and the second temperature difference threshold corresponding to the speed and the ambient temperature can be obtained. The temperature difference between the exhaust temperature and the ambient temperature can be compared with the first temperature difference threshold and the second temperature difference threshold to determine whether the refrigeration system is faulty, thereby improving the accuracy of refrigeration system fault diagnosis under different compressor speeds and different ambient temperatures.

[0095] In some embodiments, a first temperature difference threshold and a second temperature difference threshold, which are associated with at least one of rotational speed and ambient temperature, may be pre-stored in a memory and retrieved by a fault diagnosis device to obtain the first temperature difference threshold and the second temperature difference threshold.

[0096] For example, taking the condenser fan malfunction or the air duct blockage as an example, the exhaust temperature, ambient temperature, and the temperature difference between the two when the refrigeration system is operating normally and when it malfunctions under different ambient temperatures and different compressor speeds can be referred to in Table 1.

[0097] Table 1. Exhaust temperature, ambient temperature, and the temperature difference between the two.

[0098]

[0099] In Table 1, 43 represents the 43℃ ambient temperature zone, 32 represents the 32℃ ambient temperature zone, 25 represents the 25℃ ambient temperature zone, and 10 represents the 10℃ ambient temperature zone; high represents high speed, low represents low speed, and the other numbers in the table represent the temperatures or temperature differences listed in the first column of the table.

[0100] Table 1 shows that when the refrigeration system experiences condenser fan malfunction or duct blockage, the temperature difference between the exhaust temperature and the ambient temperature increases compared to normal operation. This means the abnormal temperature difference is significantly larger than the normal temperature difference, and the degree of change varies across different ambient temperature zones and different engine speeds. Therefore, by obtaining the first and second temperature difference thresholds corresponding to different engine speeds and ambient temperatures, and comparing them with the temperature difference between the exhaust temperature and the ambient temperature, the accuracy of refrigeration system fault diagnosis under different engine speeds and ambient temperatures can be improved.

[0101] The fault judgment method for the refrigeration system provided in this embodiment can realize the self-judgment of the refrigeration system under different speeds and ambient temperatures. By judging whether the refrigeration system is faulty based on the exhaust temperature and ambient temperature in the refrigeration system, it can issue an alarm as soon as the refrigeration system fails. Compared with the alarm based on the increase of the internal temperature, it can issue an alarm in advance to remind users to move the stored valuable items in advance, which is beneficial to protect the items stored in the refrigerator.

[0102] Based on the above embodiments and the same inventive concept, this disclosure also provides a fault diagnosis device for a refrigeration system. This fault diagnosis device can implement the steps of any of the fault diagnosis methods provided in the above embodiments and has corresponding beneficial effects, which will not be elaborated here.

[0103] In some embodiments, Figure 2 This is a schematic diagram of a fault diagnosis device for a refrigeration system provided in an embodiment of this disclosure. (Refer to...) Figure 2 The control device 200 may include: a temperature acquisition module 210 for acquiring the exhaust temperature of the compressor and the ambient temperature at which the refrigeration system operates; and a fault determination module 220 for determining a refrigeration system fault based on the exhaust temperature and ambient temperature meeting preset conditions.

[0104] In some embodiments, the fault determination module 220 is used to determine a refrigeration system fault based on the fact that the exhaust temperature and the ambient temperature meet preset conditions. Specifically, it may include: obtaining a comparison result based on the comparison between the exhaust temperature and the ambient temperature; and determining a refrigeration system fault based on the fact that the comparison result meets preset conditions.

[0105] In some embodiments, the fault determination module 220 is used to obtain a comparison result based on the comparison between the exhaust temperature and the ambient temperature, which may specifically include: subtracting the ambient temperature from the exhaust temperature to obtain a temperature difference; and using the temperature difference as the comparison result.

[0106] In some embodiments, the fault determination module 220 is used to determine a refrigeration system fault based on the comparison result meeting preset conditions. Specifically, it may include: determining a refrigeration system fault based on the temperature difference being less than or equal to a first temperature difference threshold, or the temperature difference being greater than or equal to a second temperature difference threshold; wherein the second temperature difference threshold is greater than the first temperature difference threshold.

[0107] In some embodiments, the fault determination module 220 may also be used to: determine that the refrigeration system fault is a compressor fault and / or a refrigerant leakage fault based on a temperature difference value less than or equal to a first temperature difference threshold; or, determine that the refrigeration system fault is at least one of a filter blockage, an air intake blockage, an air outlet blockage, and a cooling condenser fan fault based on a temperature difference value greater than or equal to a second temperature difference threshold.

[0108] In some embodiments, the fault determination module 220 may also be used to: for a variable frequency compressor, obtain the compressor speed; and based on the speed and / or ambient temperature, obtain a first temperature difference threshold and a second temperature difference threshold.

[0109] In some embodiments, the temperature acquisition module 210 is used to acquire the exhaust temperature of the compressor and the ambient temperature of the refrigeration system. Specifically, it may include: acquiring the exhaust temperature based on the exhaust temperature acquisition component and acquiring the ambient temperature based on the ambient temperature acquisition component; wherein, the exhaust temperature acquisition component is located at the inlet of the condenser connected to the compressor, and the ambient temperature acquisition component is located in the environment in which the refrigeration system operates.

[0110] It is understood that the fault diagnosis device for the refrigeration system provided in this embodiment can implement the steps of any of the fault diagnosis methods for the refrigeration system provided in the above embodiments, and has corresponding beneficial effects, which will not be elaborated here.

[0111] This disclosure also provides a computer-readable storage medium storing a computer program thereon. The computer program is executed by a processor to implement the steps of any of the fault diagnosis methods for a refrigeration system provided in the above embodiments, and has corresponding beneficial effects, which will not be elaborated here.

[0112] Based on the above embodiments, this disclosure also provides a device. For example, Figure 3 This is a schematic diagram of the structure of a device provided in an embodiment of the present disclosure, with reference to... Figure 3 The device 300 may include a memory 310 and a processor 320; the memory 310 stores an executable program or instructions; the processor 320 runs the program or instructions to implement the steps of any of the fault judgment methods for a refrigeration system provided in the above embodiments, and has corresponding beneficial effects.

[0113] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0114] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for diagnosing faults in a refrigeration system, characterized in that, The refrigeration system includes a compressor; the fault diagnosis method for the refrigeration system includes: Obtain the discharge temperature of the compressor and the ambient temperature at which the refrigeration system operates; Based on the fact that the exhaust temperature and the ambient temperature meet preset conditions, the refrigeration system is determined to be faulty.

2. The fault diagnosis method for a refrigeration system according to claim 1, characterized in that, The step of determining a refrigeration system fault based on the premise that the exhaust temperature and the ambient temperature meet preset conditions includes: The comparison result is obtained based on the comparison between the exhaust temperature and the ambient temperature; Based on the comparison results meeting preset conditions, the refrigeration system is determined to be faulty.

3. The fault diagnosis method for a refrigeration system according to claim 2, characterized in that, The comparison result obtained based on the exhaust temperature and the ambient temperature includes: The temperature difference is obtained by subtracting the ambient temperature from the exhaust temperature. The temperature difference is used as the comparison result.

4. The fault diagnosis method for a refrigeration system according to claim 3, characterized in that, The step of determining a refrigeration system fault based on the comparison result meeting preset conditions includes: The refrigeration system is determined to be faulty based on the temperature difference being less than or equal to a first temperature difference threshold, or the temperature difference being greater than or equal to a second temperature difference threshold. Wherein, the second temperature difference threshold is greater than the first temperature difference threshold.

5. The fault diagnosis method for a refrigeration system according to claim 4, characterized in that, Also includes: Based on the temperature difference being less than or equal to the first temperature difference threshold, the refrigeration system fault is determined to be a compressor fault and / or a refrigerant leakage fault. Alternatively, based on the temperature difference being greater than or equal to a second temperature difference threshold, the refrigeration system fault is determined to be at least one of the following: filter clogging, air intake blockage, air outlet blockage, and condenser fan failure.

6. The fault diagnosis method for a refrigeration system according to claim 4, characterized in that, Also includes: For the variable frequency compressor, the compressor speed is obtained; Based on the rotational speed and / or the ambient temperature, obtain the first temperature difference threshold and the second temperature difference threshold.

7. The fault diagnosis method for a refrigeration system according to claim 1, characterized in that, The process of obtaining the compressor's exhaust temperature and the ambient temperature at which the refrigeration system operates includes: The exhaust temperature is obtained based on the exhaust temperature acquisition component, and the ambient temperature is obtained based on the ambient temperature acquisition component; wherein, the exhaust temperature acquisition component is located at the inlet of the condenser connected to the compressor, and the ambient temperature acquisition component is located in the environment in which the refrigeration system operates.

8. A fault diagnosis device for a refrigeration system, characterized in that, The refrigeration system includes a compressor; the fault diagnosis device for the refrigeration system includes: A temperature acquisition module is used to acquire the exhaust temperature of the compressor and the ambient temperature at which the refrigeration system operates. The fault determination module is used to determine the fault of the refrigeration system based on the fact that the exhaust temperature and the ambient temperature meet preset conditions.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program is executed by a processor to implement the steps of the fault diagnosis method for the refrigeration system as described in any one of claims 1-7.

10. A device, characterized in that, Including memory and processor; The memory stores executable programs or instructions; The processor executes the program or instructions to implement the steps of the fault diagnosis method for the refrigeration system as described in any one of claims 1-7.

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