Air conditioning system and abnormality detection method, device, equipment and medium of throttling device

Abstract

This application provides a method, apparatus, device, and medium for detecting anomalies in an air conditioning system and a throttling device. In the anomaly detection method, based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device, a reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device is determined, and the deviation between the current pressure ratio and the reference pressure ratio is determined. Then, based on the deviation, it is determined whether the throttling device in the air conditioning system is currently in an abnormal state. Therefore, the anomaly detection method provided by this application can achieve real-time automatic detection of whether the throttling device is currently in an abnormal state based on real-time acquisition of the ambient temperature of the air conditioning system and the refrigerant pressure at both ends of the throttling device. The detection accuracy is high, and manual inspection is unnecessary. Compared with existing periodic maintenance methods, the detection efficiency is higher, the detection timeliness is better, which is beneficial to improving the safety of air conditioning system operation and reducing manual inspection costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, and in particular to an air conditioning system, an abnormality detection method and device of a throttling device, an equipment and a medium. BACKGROUND

[0002] In the existing air conditioning system, there are two common ways to detect the abnormality of an electronic expansion valve: one is to manually check, which requires an after-sales maintenance personnel to use a detection tool to detect the refrigeration system to determine whether the valve body and coil of the electronic expansion valve are abnormal; the other is to automatically detect by using a temperature sensor arranged in the air conditioning system to automatically determine whether the electronic expansion valve is abnormal.

[0003] In the process of implementing the present application, the inventors have found that at least the following problems exist in the prior art:

[0004] Manual checking is low in efficiency and heavy in workload, and the cost of manual checking is high, and resources may be wasted, and the detection by using a temperature sensor has a certain hysteresis, cannot detect in the first time, and may cause false positives and false negatives, and in serious cases, may cause damage to the air conditioning unit. SUMMARY

[0005] Therefore, the present application provides an air conditioning system and an abnormality detection method and device of a throttling device, which can reduce the cost of manual checking and accurately detect the abnormal state of the throttling device in a timely manner.

[0006] According to a first aspect of an embodiment of the present application, an abnormality detection method of a throttling device is provided, which is applied to an air conditioning system, and the abnormality detection method comprises the following steps.

[0007] According to the current environmental temperature of the air conditioning system and the current opening degree of the throttling device in the air conditioning system, a reference pressure ratio corresponding to a current pressure ratio between two ends of the throttling device is determined.

[0008] A deviation degree between the current pressure ratio and the reference pressure ratio is determined.

[0009] According to the deviation degree, it is determined whether the throttling device is currently in an abnormal state.

[0010] According to a second aspect of an embodiment of the present application, an abnormality detection device of a throttling device is provided, which is applied to an air conditioning system, and the abnormality detection device comprises the following steps.

[0011] A reference determination module is configured to determine, according to the current environmental temperature of the air conditioning system and the current opening degree of the throttling device in the air conditioning system, a reference pressure ratio corresponding to a current pressure ratio between two ends of the throttling device.

[0012] a deviation determination module configured to determine a deviation between the current pressure ratio and the reference pressure ratio;

[0013] a state determination module configured to determine whether the throttling device is currently in an abnormal state according to the deviation.

[0014] According to a third aspect of the embodiments of the present application, an abnormality detection device of a throttling device is provided, which is applied to an air conditioning system, and includes a memory and a processor, the memory stores a computer program which can be executed by the processor, and the computer program is executed by the processor to implement the abnormality detection method.

[0015] According to a fourth aspect of the embodiments of the present application, an air conditioning system is provided, which includes a throttling device and a processor, and the processor implements the abnormality detection method when executing a computer program.

[0016] According to a fifth aspect of the embodiments of the present application, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the abnormality detection method.

[0017] The abnormality detection method of the throttling device provided by the present application has at least the following advantages:

[0018] In the abnormality detection method of the throttling device provided by the present application, the reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device is determined according to the current environmental temperature of the air conditioning system and the current opening degree of the throttling device, and the deviation between the current pressure ratio and the reference pressure ratio is determined, and then whether the throttling device in the air conditioning system is currently in an abnormal state is determined according to the deviation. Therefore, the abnormality detection method provided by the present application can realize real-time automatic detection of whether the throttling device is currently in an abnormal state based on the real-time acquisition of the environmental temperature of the air conditioning system and the refrigerant pressure at the two ends of the throttling device, has high detection accuracy, and does not need manual investigation, and compared with the existing periodic maintenance method, has higher detection efficiency and better timeliness, which is conducive to improving the safety of the operation of the air conditioning system, and can reduce the cost of manual investigation. In summary, the abnormality detection method provided by the present application can reduce the cost of manual investigation and accurately detect the abnormal state of the throttling device in time.

[0019] The abnormality detection device, the abnormality detection equipment, the air conditioning system, and the computer readable storage medium provided by the present application can achieve the same technical effects as the abnormality detection method provided by the present application, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are only used to illustrate the embodiments and are not considered as limitations of the present application. Moreover, the same reference signs are used to represent the same components throughout the drawings. In the drawings:

[0021] Figure 1 A schematic diagram of the structure of the air conditioning system to which the anomaly detection method provided in this application is applied;

[0022] Figure 2 It is a flowchart illustrating an abnormality detection method for a throttling device in an air conditioning system according to some embodiments of this application;

[0023] Figure 3 This is a flowchart illustrating the process of determining a reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device in an abnormality detection method for a throttling device in an air conditioning system according to some embodiments of this application.

[0024] Figure 4 This is a schematic diagram of the process for obtaining the current pressure ratio of a throttling device in an abnormality detection method for a throttling device in an air conditioning system according to some embodiments of this application;

[0025] Figure 5 This is a flowchart illustrating a method for detecting anomalies in a throttling device in an air conditioning system according to some embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the abnormal detection device structure of the throttling device in an air conditioning system provided according to some embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the structure of an abnormality detection device for a throttling device in an air conditioning system provided according to some embodiments of this application. Detailed Implementation

[0028] With the development of refrigeration technology, electronic expansion valves have been widely used in railway train air conditioning systems. Among them, the electronic expansion valve is used as a throttling element in the air conditioning circulation system and is one of the important components.

[0029] In cooling mode, the refrigerant is compressed into a high-temperature, high-pressure gas (gaseous refrigerant) in the compressor. This gas is then discharged through the compressor's exhaust pipe to the outdoor heat exchanger, where it condenses into a room-temperature, high-pressure liquid (liquid refrigerant). After being throttled by the electronic expansion valve, it transforms into a low-temperature, low-pressure liquid. This liquid then undergoes evaporation and heat exchange in the indoor heat exchanger, becoming a low-temperature, low-pressure gas. This low-temperature, low-pressure gas then enters the compressor through the suction pipe and is compressed again into a high-temperature, high-pressure gas, entering the next cycle. In heating mode, the process is reversed. The high-temperature, high-pressure gas discharged from the compressor first condenses into a room-temperature, high-pressure liquid in the indoor heat exchanger. After being throttled by the electronic expansion valve, it transforms into a low-temperature, low-pressure liquid. This liquid then undergoes evaporation and heat exchange in the outdoor heat exchanger, becoming a low-temperature, low-pressure gas again, before returning to the compressor to enter the next cycle.

[0030] During air conditioning operation, the electronic expansion valve may become stuck or fail to open. If the electronic expansion valve is stuck, the refrigerant cannot circulate in the refrigeration or heat pump system, leading to air conditioning system failure and affecting passenger comfort. Furthermore, a malfunctioning electronic expansion valve can also cause other air conditioning system problems, such as low pressure issues, excessively high exhaust temperature, or excessive temperature difference between the supply air and exhaust gas.

[0031] In existing air conditioning systems, there are two common methods for detecting abnormalities in electronic expansion valves: one is manual inspection, which requires after-sales maintenance personnel to use testing tools to test the refrigeration system to determine whether the electronic expansion valve body and coil function are abnormal; the other is automatic detection through temperature sensors installed in the air conditioning system to automatically determine whether the electronic expansion valve is abnormal.

[0032] However, manual inspection is inefficient, labor-intensive, costly, and may lead to resource waste. Temperature sensor detection has a certain lag, cannot detect problems immediately, and may produce false alarms and missed alarms, which could damage the air conditioning unit in severe cases.

[0033] Based on this, this application provides a method, device, equipment and medium for detecting abnormalities in an air conditioning system and a throttling device, which can reduce the cost of manual troubleshooting and can detect abnormal conditions of the throttling device in a timely and accurate manner.

[0034] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the ways in which this application may be implemented. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0036] In the following description, the expression “some embodiments” is used, which describes a subset of possible embodiments. However, it should be understood that “some embodiments” can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0037] This application provides a method for detecting abnormalities in a throttling device, which is applied to an air conditioning system to detect whether the throttling device in the air conditioning system is currently in an abnormal state. Please refer to... Figure 1The diagram shows the structure of an air conditioning system to which the abnormal detection method for the throttling device provided in this application is applied. Specifically, the air conditioning system includes a compressor 2, a first heat exchanger 4, a throttling device 7, a second heat exchanger 9, and a four-way reversing valve 11. The compressor 2 is connected to the first end of the first heat exchanger 4 via the four-way reversing valve 11. The second end of the first heat exchanger 4 is connected to the first end of the throttling device 7. The second end of the throttling device 7 is connected to the first end of the second heat exchanger 9. The second end of the second heat exchanger 9 is connected to the compressor 2 via the four-way reversing valve 11. The compressor 2, the first heat exchanger 4, the throttling device 7, the second heat exchanger 9, and the four-way reversing valve 11 constitute a refrigerant circuit in which the refrigerant can circulate. The throttling device 7 can reduce the pressure of the high-pressure liquid refrigerant (i.e., the refrigerant) flowing into it, resulting in a pressure difference between the first heat exchanger 4 and the second heat exchanger 9. It is understood that the throttling device 7 here can refer to an electronic expansion valve, therefore the abnormal detection method of the throttling device provided in this application can refer to the abnormal detection method of the electronic expansion valve.

[0038] Furthermore, the first end of the four-way reversing valve 11 is connected to the first end (discharge end, or exhaust port) of the compressor 2, the second end is connected to the first end of the first heat exchanger 4, the third end is connected to the second end of the second heat exchanger 9, and the fourth end is connected to the second end (suction end, or suction port) of the compressor 2. The first end of the compressor 2 is the high-pressure end, used to discharge high-temperature and high-pressure gaseous refrigerant, while the second end of the compressor 2 is the low-pressure end, used to draw in low-temperature and low-pressure gaseous refrigerant.

[0039] When the air conditioning system is in heating mode, the high-temperature and high-pressure gaseous refrigerant ejected from the first end of the compressor 2 flows to the first end of the four-way reversing valve 11, and exits from the second end of the four-way reversing valve 11. It then flows through the refrigerant pipe to the first heat exchanger 4, and enters the first heat exchanger 4 from its first end. The first heat exchanger 4 condenses the high-temperature and high-pressure gaseous refrigerant into high-pressure liquid refrigerant. The high-pressure liquid refrigerant exits from the second end of the first heat exchanger 4 and flows through the refrigerant pipe to the first end of the throttling device 7. The throttling device 7 throttles and reduces the pressure of the high-pressure liquid refrigerant, and the low-pressure liquid refrigerant (or gas-liquid mixture) flows from... The refrigerant flows out from the second end of the throttling device 7 and through the refrigerant pipe to the first end of the second heat exchanger 9. The second heat exchanger 9 evaporates the low-pressure liquid refrigerant into low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant flows out from the second end of the second heat exchanger 9 and through the refrigerant pipe to the third end of the four-way reversing valve 11. The low-pressure gaseous refrigerant flowing into the four-way reversing valve 11 flows out from the fourth end of the four-way reversing valve 11 and through the refrigerant pipe to the second end of the compressor 2. The compressor 2 draws in the low-pressure gaseous refrigerant and compresses it into high-pressure gaseous refrigerant. The high-pressure gaseous refrigerant is ejected from the first end of the compressor 2. This process is the heating cycle process of the air conditioning system.

[0040] When the air conditioning system is in cooling mode, the high-temperature and high-pressure gaseous refrigerant ejected from the first end of the compressor 2 flows to the first end of the four-way reversing valve 11, and exits from the third end of the four-way reversing valve 11. It then flows through the refrigerant pipe to the second heat exchanger 9, and enters the second heat exchanger 9 from its second end. The second heat exchanger 9 condenses the high-temperature and high-pressure gaseous refrigerant into high-pressure liquid refrigerant. The high-pressure liquid refrigerant exits from the first end of the second heat exchanger 9 and flows through the refrigerant pipe to the second end of the throttling device 7. The throttling device 7 throttles and reduces the pressure of the high-pressure liquid refrigerant, and the low-pressure liquid refrigerant (or gas-liquid mixture) exits from the first end of the throttling device 7. The refrigerant flows out from the first end and through the refrigerant pipe to the second end of the first heat exchanger 4. The first heat exchanger 4 evaporates the low-pressure liquid refrigerant into low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant flows out from the first end of the first heat exchanger 4 and through the second end of the four-way reversing valve 11 into the four-way reversing valve 11. The low-pressure gaseous refrigerant flowing into the four-way reversing valve 11 flows out from the fourth end of the four-way reversing valve 11 and through the refrigerant pipe to the second end of the compressor 2. The compressor 2 draws in the low-pressure gaseous refrigerant from the second end and compresses the low-pressure gaseous refrigerant into high-pressure gaseous refrigerant. The high-pressure gaseous refrigerant is ejected from the first end of the compressor 2. This process is the refrigeration cycle process of the air conditioning system.

[0041] When the air conditioner is in heating mode, the first heat exchanger 4 functions as a condenser, and the second heat exchanger 9 functions as an evaporator. The first end of the throttling device 7 is the high-pressure end, and the second end is the low-pressure end. When the air conditioner is in cooling mode, the first heat exchanger 4 functions as an evaporator, and the second heat exchanger 9 functions as a condenser. The first end of the throttling device 7 is the low-pressure end, and the second end is the high-pressure end. The refrigerant pressure at the low-pressure end is lower than the refrigerant pressure at the high-pressure end.

[0042] In addition, please continue to refer to Figure 1As shown, in some embodiments, the air conditioning system further includes a high-pressure switch 1 and a low-pressure switch 3, wherein the high-pressure switch 1 is connected to the first end of the compressor 2, and the low-pressure switch 3 is connected to the second end of the compressor 2. Further, in some embodiments, the first heat exchanger 4 is the indoor heat exchanger of the air conditioning system, and the second heat exchanger 9 is the outdoor heat exchanger of the air conditioning system. The air conditioning system also includes a first fan 5 and a second fan 10. The first fan 5 is disposed on one side of the first heat exchanger 4. For example, in cooling mode, the first fan 5 can provide the power for gas circulation to circulate the cold air generated by the first heat exchanger 4 into the indoor space, thereby adjusting the room temperature. The second fan 10 is disposed on one side of the second heat exchanger 9. For example, in cooling mode, the second fan 10 can force outdoor air to form forced convection with the second heat exchanger 9 to cool the high-temperature, high-pressure refrigerant in the second heat exchanger 9, thereby condensing the high-temperature, high-pressure refrigerant in the second heat exchanger 9 into a high-pressure liquid refrigerant. The indoor fan can circulate the cold air generated in the evaporator into the space. Specifically, the first fan 5 is a blower (or evaporator fan), and the second fan 10 is a condenser fan.

[0043] The anomaly detection method provided in this application embodiment can be used to detect whether the throttling device 7 in an air conditioning system is in an abnormal state. To further achieve anomaly detection of the throttling device 7, please refer to... Figure 1 As shown, the air conditioning system provided in this embodiment further includes a first pressure sensor 6 and a second pressure sensor 8. The first pressure sensor 6 is connected to the first end of the throttling device 7, and the second pressure sensor 8 is connected to the second end of the throttling device 7. The first pressure sensor 6 can be used to detect the first pressure P1 of the refrigerant at the first end of the throttling device 7 in real time, and the second pressure sensor 8 can be used to detect the second pressure P2 of the refrigerant at the second end of the throttling device 7 in real time. When the air conditioning system is in heating mode, the first end of the throttling device 7 is the high-pressure end, and the second end of the throttling device 7 is the low-pressure end. The first pressure P1 is the pressure of the high-pressure liquid refrigerant, and the second pressure P2 is the pressure of the low-pressure liquid refrigerant. The first pressure P1 is greater than the second pressure P2. The first pressure P1 is the high-pressure pressure relative to the second pressure P2, and the second pressure P2 is the low-pressure pressure relative to the first pressure P1. Conversely, when the air conditioning system is in cooling mode, the first end of the throttling device 7 is the low-pressure end, the second end of the throttling device 7 is the high-pressure end, the first pressure P1 is the pressure of the low-pressure liquid refrigerant, the second pressure P2 is the pressure of the high-pressure liquid refrigerant, the first pressure P1 is less than the second pressure P2, the first pressure P1 is the low-pressure relative to the second pressure P2, and the second pressure P2 is the high-pressure relative to the first pressure P1.

[0044] For details, please refer to Figure 2The diagram shown is a flowchart illustrating an anomaly detection method for a throttling device according to some embodiments of this application. The anomaly detection method provided in this application includes steps S02, S04, and S06, each described below.

[0045] S02: Determine the reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device in the air conditioning system.

[0046] The current ambient temperature of the air conditioning system refers to the temperature of the environment in which the air conditioning system is located. The air conditioning system can operate under different ambient temperature conditions. The throttling device in S02 is as follows: Figure 1 The throttling device 7 shown is illustrated. In some embodiments, the throttling device 7 can be an electronic expansion valve; in other embodiments, it can also be a thermostatic expansion valve or a capillary valve, etc. The current pressure ratio between the two ends of the throttling device is used to characterize the pressure ratio between the current first pressure P1 of the refrigerant at the first end of the throttling device 7 and the current second pressure P2 of the refrigerant at the second end of the throttling device 7, or to characterize the pressure ratio between the current second pressure P2 of the refrigerant at the second end of the throttling device 7 and the current first pressure P1 of the refrigerant at the first end of the throttling device 7. In some embodiments, the current pressure ratio can be the current P1 / P2 or the current P2 / P1. The first pressure P1 is detected by the first pressure sensor 6, and the second pressure P2 is detected by the second pressure sensor 8.

[0047] The reference pressure ratio refers to the expected pressure ratio of the current pressure ratio mentioned above. That is, the value of the reference pressure ratio is the ideal value of the current pressure ratio when the throttling device 7 is in normal condition.

[0048] During their research, the inventors discovered that when an air conditioning system operates under different ambient temperatures, the pressure ratio (refrigerant pressure ratio between the two ends of the throttling device 7) changes with the opening degree of the throttling device 7. Therefore, under different ambient temperatures and at different opening degrees, the pressure ratio between the two ends of the throttling device has different reference pressure ratios. Thus, based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device, the reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device can be determined.

[0049] S04: Determine the deviation between the current pressure ratio and the reference pressure ratio.

[0050] The greater the difference between the current pressure ratio and the reference pressure ratio, the greater the deviation between the current pressure ratio and the reference pressure ratio. In some embodiments, the deviation can be the percentage of the deviation between the current pressure and the reference pressure relative to the reference pressure. It should be noted that the specific calculation method for the deviation between the current pressure and the reference pressure is not limited in this application; any parameter that can characterize the degree to which the current pressure deviates from the reference pressure ratio is acceptable.

[0051] S06: Determine whether the throttling device is currently in an abnormal state based on the deviation.

[0052] After determining the deviation, it is then determined whether the deviation meets preset conditions. If it does, the throttling device 7 is determined to be in a normal state; otherwise, it is determined to be in an abnormal state. The preset conditions can refer to the deviation value being a preset value or within a preset range. An abnormal state of the throttling device 7 includes the throttling device 7 being stuck.

[0053] As can be seen from the above, in the abnormal detection method of the throttling device provided in some embodiments of this application, the reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device is determined based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device, and the deviation between the current pressure ratio and the reference pressure ratio is determined. Then, based on the deviation, it is determined whether the throttling device in the air conditioning system is currently in an abnormal state. Therefore, the abnormal detection method provided in the embodiments of this application can achieve real-time automatic detection of whether the throttling device is currently in an abnormal state based on the real-time acquisition of the ambient temperature of the air conditioning system and the refrigerant pressure ratio at both ends of the throttling device, as well as the value of the refrigerant pressure ratio under the corresponding temperature conditions. The detection accuracy is high, and no manual inspection is required. Compared with the existing periodic maintenance method, the detection efficiency is higher, the detection timeliness is better, which is beneficial to improving the safety of air conditioning system operation and reducing manual inspection costs. In summary, the abnormal detection method provided in the embodiments of this application can reduce manual inspection costs and can detect the abnormal state of the throttling device in a timely and accurate manner.

[0054] Please see Figure 3 The diagram illustrates a process for determining a reference pressure ratio corresponding to the current pressure ratio between the two ends of a throttling device in an anomaly detection method for a throttling device according to some embodiments of this application. In this embodiment, S02 further includes S022 and S024, and the specific descriptions of each step are as follows.

[0055] S022: Based on the preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures, and the current ambient temperature, determine the preset relationship corresponding to the current ambient temperature as a reference relationship between the current pressure ratio and the current opening degree.

[0056] Based on the opening degrees of multiple throttling devices and the corresponding pressure ratios between the two ends of the throttling devices under different ambient temperature conditions, the inventors of this application can obtain a preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device when the throttling device is in normal operation. Based on this preset relationship, the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device satisfy different preset relationships under different ambient temperatures. Therefore, in this embodiment, the preset relationships corresponding to different ambient temperatures can be stored in the controller of the air conditioning system first. Then, based on the current ambient temperature of the air conditioning system, the preset relationship corresponding to the current ambient temperature is determined from the preset relationships stored in the controller, and this determined preset relationship is used as a reference relationship between the current pressure ratio and the current opening degree. That is, when the throttling device is in normal operating condition, the current pressure ratio between the two ends of the throttling device and the current opening degree of the throttling device should be this reference relationship or close to this reference relationship.

[0057] S024: Determine the reference pressure ratio corresponding to the current pressure ratio based on the current opening degree and reference relationship.

[0058] After determining the reference relationship between the current pressure ratio across the throttling device and the current opening degree of the throttling device, substituting the current opening degree of the throttling device into this reference relationship, the reference pressure ratio corresponding to the current pressure ratio can be determined. In other words, the reference pressure ratio is the pressure ratio calculated based on the reference relationship between the current opening degree and the current pressure ratio.

[0059] In some embodiments, S022 specifically includes: determining a preset relationship corresponding to the current ambient temperature and current frequency as a reference relationship between the current pressure ratio and the current opening degree of the throttling device based on the preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures and different compressor frequencies, the current ambient temperature, and the current frequency of the compressor of the air conditioning system.

[0060] Furthermore, during the research process, the inventors of this application discovered that under the same ambient temperature conditions, different compressor frequencies in the air conditioning system result in different relationships between the current pressure ratio across the throttling device and its opening degree under normal operating conditions. Therefore, based on multiple sets of pressure ratios across the throttling devices and their corresponding opening degrees under each ambient temperature condition and compressor frequency, a preset relationship between the pressure ratio across the throttling device and its opening degree can be determined for each ambient temperature condition and compressor frequency. These preset relationships can be stored, for example, in the controller of the air conditioning system. Then, the current ambient temperature and compressor frequency are obtained. Based on these conditions, a preset relationship corresponding to the current ambient temperature and frequency is determined from the stored preset relationships, serving as a reference relationship between the current pressure ratio and the current opening degree.

[0061] In some embodiments, S022 may further include: determining a preset relationship corresponding to the current ambient temperature in the current operating mode as a reference relationship between the current pressure ratio and the current opening degree, based on the preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures in different operating modes, the current ambient temperature, and the current operating mode of the air conditioning system.

[0062] In some embodiments, the aforementioned preset relationship is: the pressure ratio between the two ends of the throttling device is a preset high-order function of the opening degree of the throttling device. Before executing S02 above, it is necessary to store the preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures and different compressor frequencies. Specifically, this includes: obtaining the pressure ratio between the two ends of the throttling device corresponding to different opening degrees of the throttling device under different ambient temperatures and different compressor frequencies; and then fitting the obtained opening degrees of each throttling device and the corresponding pressure ratios to fit the pressure ratio between the two ends of the throttling device as a preset high-order function of the opening degree of the throttling device. Here, a high-order function refers to a function of degree three or higher, and the high-order function determined by this fitting is the aforementioned preset relationship.

[0063] In some embodiments, the preset higher-order functions corresponding to different ambient temperatures are respectively higher-order functions fitted by the pressure ratio between the two ends of the throttling device based on different opening degrees of the throttling device at the corresponding ambient temperatures.

[0064] Taking the air conditioner in cooling mode as an example, in cooling mode, when the throttling device is working normally, the current pressure ratio P2 / P1 between the two ends of the throttling device is the smallest when the throttling device is at its maximum opening (in heating mode, the pressure ratio can be P1 / P2), and the current pressure ratio P2 / P1 is the largest when the throttling device is at its minimum opening. After the air conditioning system design and matching are completed, if the ambient temperature T of the air conditioning system is between 20℃ and 45℃, the operating conditions of the air conditioning system can be divided into different ambient temperature conditions, such as T1, T2, T3, etc., with a temperature difference of 1℃. Under different ambient temperature conditions, the first pressure P1 and the second pressure P2 corresponding to different openings (also called opening steps) B of the throttling device (the opening unit of the electronic expansion valve is: steps, that is, the adjustment of the opening of the electronic expansion valve is generally calculated in "steps") are obtained. Based on the opening degree B of each throttling device and the corresponding current pressure ratio P2 / P1 under each ambient temperature condition, a higher-order formula is fitted for each ambient temperature condition. For example, under ambient temperature condition T1, the higher-order formula fitted between the ratio of P1 and P2 and the opening degree B of the throttling device is: P2 / P1=N1*B^3+N2*B^2+N3*B+N4, where N1, N2, N3, and N4 are constant coefficients. Each ambient temperature condition corresponds to a well-fitted higher-order formula, which is the aforementioned preset relationship.

[0065] In the cooling mode of the air conditioning system, the ambient temperature range is divided into multiple ambient temperature conditions according to a certain step size. The step size can refer to the temperature difference between two adjacent ambient temperature conditions. For example, if the ambient temperature range is 20℃ to 45℃, and the step size is 1℃, the ambient temperature range can be divided into multiple ambient temperature conditions. The first ambient temperature condition corresponds to an ambient temperature of 20℃, the second ambient temperature condition corresponds to an ambient temperature of 21℃, and so on, with a temperature difference of 1℃ between two adjacent ambient temperature conditions. Under each ambient temperature condition, the opening degree of the throttling device is adjusted to a different value. For each opening degree B, its corresponding pressure ratio P2 / P1 is obtained. Then, for each ambient temperature condition, multiple sets of opening degrees B and corresponding pressure ratios P2 / P1 are fitted to obtain the aforementioned high-order function, which serves as the preset relationship for each ambient temperature condition. These preset relationships for each ambient temperature condition are stored; for example, they can be stored in the controller of the air conditioning system. After obtaining the current ambient temperature of the air conditioning system, the current ambient temperature operating condition of the air conditioning system can be determined. Then, the preset relationship corresponding to the current ambient temperature operating condition is used as a reference relationship between the current pressure ratio P2 / P1 and the current opening degree of the throttling device. After obtaining the current opening degree of the throttling device, substituting the current opening degree into the higher-order function corresponding to the reference relationship, the reference pressure ratio P2 / P1 can be determined. Furthermore, under each ambient temperature operating condition, for each compressor frequency, the opening degree of the throttling device can be adjusted to a different value. For each opening degree B, its corresponding pressure ratio P2 / P1 can be obtained. Then, for each compressor frequency under each ambient temperature operating condition, multiple sets of opening degrees B and the corresponding pressure ratios P2 / P1 are fitted to obtain the aforementioned higher-order function, thus obtaining the preset relationship corresponding to the compressor at different frequencies under each ambient temperature operating condition. These preset relationships are stored so that after obtaining the current ambient temperature of the air conditioning system and the current frequency of the compressor, the preset relationship corresponding to the current frequency under the current ambient temperature can be determined, and this preset relationship is used as the aforementioned reference relationship. Similarly, when the air conditioning system is in heating mode, the process of obtaining the reference pressure ratio of the current pressure ratio can be referred to the process when the air conditioning system is in cooling mode, and will not be repeated here.

[0066] After the air conditioning system design and matching are completed, the aforementioned preset relationships are stored in the air conditioning system controller. Under different ambient temperature conditions, the first pressure P1 and the second pressure P2 of the throttling device at different opening degrees can be acquired in real time. Specifically, the first pressure P1 is detected in real time by the first pressure sensor 6, and the second pressure P2 is detected in real time by the second pressure sensor 8. The current pressure ratio P2 / P1 between the two ends of the throttling device 7 under the current ambient temperature conditions is used to determine whether the throttling device 7 is in an abnormal state (such as a stuck state), which helps improve the timeliness and accuracy of detecting abnormal states of the throttling device. Specifically, a deviation threshold range can be preset. If the deviation is not within the preset deviation threshold range, the throttling device is determined to be in an abnormal state; otherwise, it is determined to be in normal working condition, thus avoiding false alarms and missed alarms.

[0067] Please see Figure 4 The diagram shows a flowchart illustrating the process of obtaining the current pressure ratio of a throttling device in an abnormality detection method for a throttling device in an air conditioning system according to some embodiments of this application. In this embodiment, prior to S02, the abnormality detection method further includes S012 and S014, each step of which is described in detail below.

[0068] S012: Obtain the first pressure of the refrigerant at the first end of the throttling device and the second pressure of the refrigerant at the second end of the throttling device, respectively.

[0069] The anomaly detection method provided in the embodiments of this application is applied to, for example, Figure 1 When the air conditioning system is in cooling mode, the first end of the throttling device 7 is the low-pressure end and the second end is the high-pressure end, and the first pressure P1 is less than the second pressure P2. When the air conditioning system is in heating mode, the first end of the throttling device 7 is the high-pressure end and the second end is the low-pressure end, and the first pressure P1 is greater than the second pressure P2.

[0070] S014: Obtain the current pressure ratio based on the first pressure and the second pressure.

[0071] When the air conditioning system is currently operating in cooling mode, if the first pressure P1 is less than the second pressure ratio P2, then the ratio of the second pressure P2 to the first pressure P1 is calculated to obtain the current pressure ratio P2 / P1. When the air conditioning system is currently operating in heating mode, if the first pressure P1 is greater than the second pressure ratio P2, then the ratio of the first pressure P1 to the second pressure P2 is calculated to obtain the current pressure ratio P1 / P2.

[0072] Please see Figure 5The diagram shown is a flowchart illustrating an anomaly detection method for a throttling device in an air conditioning system according to some embodiments of this application. In this embodiment, after S06, the anomaly detection method further includes S072, S074, S076, and S078, each in... Figure 1 The additional steps are described below.

[0073] S072: When it is determined that the throttling device is currently in an abnormal state, control the throttling device to reset.

[0074] Resetting the throttling device means resetting the opening of the throttling device to its initial value. After the throttling device is reset, the air conditioning system restarts. After the air conditioning system restarts, the opening of the throttling device is adjusted according to the preset control strategy based on the initial value.

[0075] S074: After the throttling device is reset, determine whether the throttling device has returned to normal.

[0076] After the throttling device is reset, the air conditioning system restarts. During the restart of the air conditioning system, the throttling device is determined to be in an abnormal state according to the method for determining whether the throttling device is currently in an abnormal state according to any embodiment of this application. If it is, it is determined that the throttling device has not returned to normal state, and S076 is executed. If not, it is determined that the throttling device has returned to normal state, and S078 is executed.

[0077] S076: If it is determined that the throttling device has not returned to normal operation, the operation of the air conditioning system shall be terminated and an alarm shall be issued.

[0078] When the throttling device malfunctions, the air conditioning system attempts to automatically recover. This automatic recovery process involves resetting the throttling device and then restarting the air conditioning system. After restarting, the air conditioning system determines whether the throttling device has returned to normal. If it has, there is no need to address the malfunction, and the air conditioning system has successfully recovered automatically without manual intervention. Step S078 is executed. If the malfunction has not been resolved, the automatic recovery has failed, and an alarm is triggered to prompt manual intervention for the throttling device malfunction.

[0079] S078: If it is determined that the throttling device has returned to normal, the air conditioning system continues to operate. If the air conditioning system can automatically recover successfully after the throttling device malfunctions (i.e., the throttling device returns to normal after the air conditioning system restarts), the air conditioning system continues to operate according to the preset control strategy. Furthermore, after the air conditioning system automatically recovers successfully, the current malfunction of the throttling device can be recorded and an early warning can be issued to indicate that the throttling device has malfunctioned, facilitating user inspection and enabling intelligent operation and maintenance. In the malfunction detection method provided in this application embodiment, after performing the throttling device reset operation, if the throttling device returns to normal operation (i.e., the deviation between the current pressure ratio and the reference pressure ratio meets the above-mentioned preset conditions), it indicates that the current malfunction of the throttling device is a reversible and occasional malfunction, and the air conditioning system continues to operate normally. By resetting the throttling device, the reversible and occasional malfunction of the throttling device is restored to normal, avoiding unnecessary resource waste and economic losses caused by users replacing the throttling device due to occasional failures. If, after performing a reset operation on the throttling device, the throttling device still fails to return to normal operation (i.e., the deviation between the current pressure ratio and the reference pressure ratio still does not meet the aforementioned preset conditions), it indicates that the current abnormality in the throttling device is an irreversible fault. If the throttling device still cannot return to normal after the reset operation, a fault alarm will be issued to remind maintenance personnel to perform repairs and replacement. As can be seen from the above, the abnormality detection method provided in some embodiments of this application can achieve at least one of the following technical effects:

[0080] 1. It effectively improves the efficiency of fault detection of throttling devices. The real-time detection method can replace periodic maintenance and reduce the cost of manual troubleshooting.

[0081] 2. It effectively improves the accuracy of fault detection of throttling devices, has good real-time detection, and is conducive to protecting refrigeration / heat pump systems. It can avoid unnecessary waste of resources and economic losses caused by users replacing expansion valves due to occasional failures.

[0082] 3. When the throttling device is an electronic expansion valve, if there are multiple electronic expansion valves in the air conditioning system, the faulty electronic expansion valve can be quickly located in the air conditioning system with multiple electronic expansion valves, which has high maintenance efficiency.

[0083] Please see Figure 6The diagram shows a schematic of an anomaly detection device for a throttling device provided according to some embodiments of this application. The anomaly detection device provided in this application is applied to an air conditioning system. The device includes a reference determination module 111, a deviation determination module 112, and a state determination module 113. The reference determination module 111 is used to determine a reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device. The deviation determination module 112 is used to determine the deviation between the current pressure ratio and the reference pressure ratio. The state determination module 113 is used to determine whether the throttling device is currently in an abnormal state based on the deviation. The anomaly detection device and the anomaly detection method provided in this application can achieve the same technical effect, and will not be described further here.

[0084] Furthermore, the reference determination module 111 is specifically used to determine the reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device according to the method of determining the reference pressure ratio in the anomaly detection method provided in any embodiment of this application. The deviation determination module 112 is specifically used to determine the deviation between the current pressure ratio and the reference pressure ratio according to the method of determining the deviation between the current pressure ratio and the reference pressure ratio in the anomaly detection method provided in any embodiment of this application. The state determination module 113 is specifically used to determine whether the throttling device is currently in an abnormal state according to the method of determining whether the throttling device is in an abnormal state based on the deviation in the anomaly detection method provided in any embodiment of this application.

[0085] Furthermore, in some embodiments, the anomaly detection device further includes an anomaly handling module. Figure 6 (Not shown in the diagram) The exception handling module is specifically used to control the throttling device to reset when it is determined that the throttling device is currently in an abnormal state, and to determine whether the throttling device has returned to normal after the throttling device is reset. If yes, the operation of the air conditioning system is terminated and an alarm is issued. If no, the operation of the air conditioning system is maintained.

[0086] Please see Figure 7 The diagram shows a schematic of an anomaly detection device for a throttling device according to some embodiments of this application. The anomaly detection device provided in this application is applied to an air conditioning system. In this embodiment, the anomaly detection device includes a memory 211 and a processor 212. The memory 211 stores a computer program executable by the processor 212. When the computer program is executed by the processor 212, it implements the anomaly detection method provided according to any embodiment of this application. The anomaly detection device and the anomaly detection method provided in this application can achieve the same technical effects, and will not be described further here.

[0087] Furthermore, this application also provides an air conditioning system, which includes a throttling device and a processor. The processor, when executing a computer program, implements the anomaly detection method provided according to any embodiment of this application. Specifically, in some embodiments, the air conditioning system provided by this application is as follows: Figure 1 As shown, only in Figure 1 The processor of the air conditioning system is not shown in the diagram. The first pressure sensor 6 of the air conditioning system is connected to the first end of the throttling device 7, and the second pressure sensor 8 is connected to the second end of the throttling device. The first pressure sensor 6 can be used to detect the first pressure P1 of the refrigerant at the first end of the throttling device in real time and send the first pressure P1 to the processor. The second pressure sensor 8 can be used to detect the second pressure P2 of the refrigerant at the second end of the throttling device 7 in real time and send the second pressure P2 to the processor. The air conditioning system provided in this embodiment and the anomaly detection method provided in this embodiment achieve the same technical effect, and will not be described further here.

[0088] This application also provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the various processes in the anomaly detection method provided in any embodiment of this application and achieves the same technical effect. To avoid repetition, further details are omitted here. The computer-readable storage medium includes, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0089] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for detecting abnormalities in a throttling device, applied to an air conditioning system, characterized in that, The anomaly detection method includes: Based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device in the air conditioning system, a reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device is determined, including: based on a preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures and the current ambient temperature, determining a preset relationship corresponding to the current ambient temperature as a reference relationship between the current pressure ratio and the current opening degree; and based on the current opening degree and the reference relationship, determining the reference pressure ratio corresponding to the current pressure ratio. Determine the deviation between the current pressure ratio and the reference pressure ratio; The deviation is used to determine whether the throttling device is currently in an abnormal state.

2. The anomaly detection method according to claim 1, characterized in that, The step of determining the preset relationship corresponding to the current ambient temperature as a reference relationship between the current pressure ratio and the current opening degree based on the preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures, and the current ambient temperature, includes: Based on the pressure ratio between the two ends of the throttling device and the preset relationship between the opening degree of the throttling device under different ambient temperatures and different compressor frequencies, the current ambient temperature and the current frequency of the compressor of the air conditioning system, a preset relationship corresponding to the current ambient temperature and the current frequency is determined as a reference relationship between the current pressure ratio and the current opening degree.

3. The anomaly detection method according to claim 1, characterized in that, The preset relationship is as follows: the pressure ratio between the two ends of the throttling device is a preset high-order function of the opening degree of the throttling device.

4. The anomaly detection method according to claim 3, characterized in that, The preset higher-order functions corresponding to different ambient temperatures are respectively higher-order functions fitted by the pressure ratio between the two ends of the throttling device based on different opening degrees of the throttling device at the corresponding ambient temperatures.

5. The anomaly detection method according to any one of claims 1 to 4, characterized in that, Also includes: The first pressure of the refrigerant at the first end of the throttling device and the second pressure of the refrigerant at the second end of the throttling device are obtained respectively. The current pressure ratio is obtained based on the first pressure and the second pressure.

6. The anomaly detection method according to any one of claims 1 to 4, characterized in that, The throttling device is an electronic expansion valve.

7. The anomaly detection method according to any one of claims 1 to 4, characterized in that, Also includes: When it is determined that the throttling device is currently in an abnormal state, the throttling device is controlled to reset; After the throttling device is reset, determine whether the throttling device has returned to normal. If not, the operation of the air conditioning system will be terminated and an alarm will be triggered; If so, then keep the air conditioning system running.

8. A fault detection device for a throttling device, applied to an air conditioning system, characterized in that, The anomaly detection device includes: The reference determination module is used to determine a reference pressure ratio corresponding to the current pressure ratio between the two ends of the throttling device based on the current ambient temperature of the air conditioning system and the current opening degree of the throttling device in the air conditioning system. This includes: determining a preset relationship corresponding to the current ambient temperature as a reference relationship between the current pressure ratio and the current opening degree based on a preset relationship between the pressure ratio between the two ends of the throttling device and the opening degree of the throttling device under different ambient temperatures, and the current ambient temperature; and determining the reference pressure ratio corresponding to the current pressure ratio based on the current opening degree and the reference relationship. The deviation determination module is used to determine the degree of deviation between the current pressure ratio and the reference pressure ratio; The status determination module is used to determine whether the throttling device is currently in an abnormal state based on the deviation.

9. An abnormality detection device for a throttling device, applied to an air conditioning system, characterized in that, The anomaly detection device includes a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed by the processor, it implements the anomaly detection method as described in any one of claims 1 to 7.

10. An air conditioning system, characterized in that, It includes a throttling device and a processor, which, when executing a computer program, implements the anomaly detection method as described in any one of claims 1 to 7.

11. The air conditioning system according to claim 10, characterized in that, It also includes a first pressure sensor connected to a first end of the throttling device and a second pressure sensor connected to the refrigerant at a second end of the throttling device; The first pressure sensor can be used to detect the first pressure of the refrigerant at the first end of the throttling device in real time, and send the first pressure to the processor; The second pressure sensor can be used to detect the second pressure of the refrigerant at the second end of the throttling device in real time, and send the second pressure to the processor.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the anomaly detection method as described in any one of claims 1 to 7.

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