Method and apparatus for detecting refrigerant leakage of an air conditioner, readable storage medium

Abstract

The application discloses a kind of for detecting the method and device of refrigerant leakage of air conditioner, readable storage medium, wherein, method includes: when air conditioner normal operation, the operating mode of air conditioner is determined, indoor temperature, outdoor temperature and indoor unit running capacity, and operating mode, indoor temperature, outdoor temperature and indoor unit running capacity are combined, obtain multiple parameter groups;Determine the current operating parameter of air conditioner under each parameter group;According to current operating parameter, determine whether the refrigerant of air conditioner leaks.By this means, the operating mode of air conditioner, indoor temperature, outdoor temperature and indoor unit running capacity are combined to obtain multiple parameter groups, and whether the refrigerant leaks is judged according to current operating parameter under each parameter group, so as to subdivide the change of refrigerant flow, improve the judgment precision of refrigerant leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a method for detecting refrigerant leakage of an air conditioner, a computer readable storage medium, an air conditioner and a device for detecting refrigerant leakage of an air conditioner. BACKGROUND

[0002] Refrigerant leakage can be discovered through leakage sound of a leakage part or oil spots of the leakage part. If these symptoms are not discovered, the refrigerant leakage is discovered only when the COP (Coefficient Of Performance) drops (not cool / not warm) and the like, which brings inconvenience to a user.

[0003] In refrigerant leakage detection, a professional first determines whether refrigerant leakage occurs, adds refrigerant after repairing the refrigerant leakage part, and then ends the refrigerant leakage detection work. If it is slow refrigerant leakage, since it is difficult to lock the leakage part, only the refrigerant adding work can be performed, and thus the refrigerant leaks again, which brings inconvenience to the user.

[0004] In addition, during system operation, the refrigerant leakage can be discovered only when the refrigerant leakage is about 50%. Even if the refrigerant leakage is discovered, in order to determine the leakage cause, a special operation needs to be performed, or a leakage detector needs to be used to confirm all systems. However, if the refrigerant leakage is more than 50%, the compressor wear and wear powder can cause system failure, and repair requires a large amount of time and cost. If it is slow leakage, it can be discovered only after several years, and thus in order to prevent such an event, regular leakage detection is required, which increases the work burden of the professional. SUMMARY

[0005] The present application aims to solve at least one of the problems in the related art. To this end, a first object of the present application is to provide a method for detecting refrigerant leakage of an air conditioner, a plurality of parameter groups are obtained by combining an operation mode of the air conditioner, an indoor temperature, an outdoor temperature and an indoor unit operation capacity, and whether the refrigerant leaks is detected according to current operation parameters of the air conditioner in each parameter group, thereby subdividing changes in refrigerant flow, and improving the judgment accuracy of refrigerant leakage.

[0006] A second object of the present application is to provide a computer readable storage medium.

[0007] A third object of the present application is to provide an air conditioner.

[0008] A fourth object of the present application is to provide a device for detecting refrigerant leakage of an air conditioner.

[0009] To achieve the above object, the first aspect of the present application provides a method for detecting refrigerant leakage of an air conditioner, comprising: determining the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity of the air conditioner when the air conditioner is normally running; combining the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity to obtain a plurality of parameter groups; determining the current operation parameters of the air conditioner under each parameter group; and determining whether the refrigerant of the air conditioner leaks according to the current operation parameters.

[0010] According to the method for detecting refrigerant leakage of an air conditioner provided by the embodiment of the present application, firstly, the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity of the air conditioner are determined when the air conditioner is normally running, and the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity are combined to obtain a plurality of parameter groups, then the current operation parameters of the air conditioner under each parameter group are determined, and whether the refrigerant of the air conditioner leaks is determined according to the current operation parameters. Thus, the method combines the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity of the air conditioner to obtain a plurality of parameter groups, and judges whether the refrigerant leaks according to the current operation parameters under each parameter group, thereby subdividing the change of refrigerant flow, and improving the judgment accuracy of refrigerant leakage.

[0011] In addition, the method for detecting refrigerant leakage of an air conditioner provided by the above-mentioned embodiments of the present application can have the following additional technical features:

[0012] According to one embodiment of the present application, the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity are combined to obtain a plurality of parameter groups, comprising: combining different intervals of the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity to obtain a plurality of parameter groups.

[0013] According to one embodiment of the present application, the number of the plurality of parameter groups when the operation mode is the heating mode is greater than the number of the plurality of parameter groups when the operation mode is the cooling mode.

[0014] According to one embodiment of the present application, the current operation parameters comprise: compressor running frequency, indoor throttle valve opening degree, outdoor throttle valve opening degree, outdoor fan rotating speed, compressor suction pressure, compressor discharge superheat and compressor suction superheat.

[0015] According to one embodiment of the present application, whether the refrigerant of the air conditioner leaks is determined according to the current operation parameters, comprising: when at least two current operation parameters under any parameter group meet a preset condition, determining that the refrigerant of the air conditioner under the parameter group is abnormal; and when the number of the parameter groups in which the refrigerant is abnormal reaches a preset value, determining that the air conditioner leaks refrigerant.

[0016] According to one embodiment of the present application, when the operation mode is the cooling mode, the preset conditions include: the compressor operating frequency is greater than a first frequency reference value; the indoor throttling valve opening is greater than a first opening reference value; the outdoor throttling valve opening is greater than a second opening reference value; the outdoor fan rotating speed is greater than a first rotating speed reference value; the compressor suction pressure is less than a first pressure reference value; the compressor discharge superheat is greater than a first discharge superheat reference value; and the compressor suction superheat is greater than a first suction superheat reference value.

[0017] According to one embodiment of the present application, when the operation mode is the heating mode, the preset conditions include: the compressor operating frequency is greater than a second frequency reference value; the indoor throttling valve opening is less than a third opening reference value; the outdoor throttling valve opening is greater than a fourth opening reference value; the outdoor fan rotating speed is greater than a second rotating speed reference value; the compressor suction pressure is less than a second pressure reference value; the compressor discharge superheat is greater than a second discharge superheat reference value; and the compressor suction superheat is greater than a second suction superheat reference value.

[0018] To achieve the above object, the second aspect of the present application provides a computer readable storage medium, which has stored thereon a program for detecting refrigerant leakage of an air conditioner, and the program for detecting refrigerant leakage of the air conditioner is executed by a processor to implement the above method for detecting refrigerant leakage of the air conditioner.

[0019] The computer readable storage medium according to the embodiment of the present application, by executing the program for detecting refrigerant leakage of the air conditioner stored thereon by the processor, implements the above method for detecting refrigerant leakage of the air conditioner, and improves the judgment accuracy of the refrigerant leakage.

[0020] To achieve the above object, the third aspect of the present application provides an air conditioner, which comprises a memory, a processor, and a program for detecting refrigerant leakage of the air conditioner stored in the memory and executable on the processor, and the program for detecting refrigerant leakage of the air conditioner is executed by the processor to implement the above method for detecting refrigerant leakage of the air conditioner.

[0021] The air conditioner according to the embodiment of the present application, by executing the program for detecting refrigerant leakage of the air conditioner stored in the memory by the processor, implements the above method for detecting refrigerant leakage of the air conditioner, and improves the judgment accuracy of the refrigerant leakage.

[0022] To achieve the above object, the fourth aspect of the present application provides a device for detecting refrigerant leakage of an air conditioner, comprising: a determination module, configured to determine an operation mode, an indoor temperature, an outdoor temperature and an indoor unit running capacity of the air conditioner when the air conditioner is normally running, and combine the operation mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity to obtain a plurality of parameter groups, and determine current operation parameters of the air conditioner under each parameter group; and a detection module, configured to determine whether the air conditioner leaks refrigerant according to the current operation parameters.

[0023] The device for detecting refrigerant leakage of an air conditioner according to the embodiment of the present application determines the operation mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity of the air conditioner when the air conditioner is normally running through the determination module, combines the operation mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity to obtain a plurality of parameter groups, and determines the current operation parameters of the air conditioner under each parameter group, and the detection module determines whether the air conditioner leaks refrigerant according to the current operation parameters, so that the device obtains a plurality of parameter groups through the combination of the operation mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity of the air conditioner, and judges whether the refrigerant leaks according to the current operation parameters under each parameter group, thereby subdividing the change of the refrigerant flow, and improving the judgment accuracy of the refrigerant leakage.

[0024] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A flow chart of the method for detecting refrigerant leakage of an air conditioner according to an embodiment of the present application;

[0026] Figure 2 A connection diagram of an indoor unit and an outdoor unit in a refrigeration mode according to an embodiment of the present application;

[0027] Figure 3 A connection diagram of an indoor unit and an outdoor unit in a heating mode according to an embodiment of the present application;

[0028] Figure 4 A Mollier diagram caused by refrigerant leakage according to an embodiment of the present application;

[0029] Figure 5 A normal distribution diagram according to an embodiment of the present application;

[0030] Figure 6 A flow chart of the method for detecting refrigerant leakage of an air conditioner according to a specific embodiment of the present application;

[0031] Figure 7This is a block diagram of an air conditioner according to an embodiment of the present invention;

[0032] Figure 8 This is a block diagram of an apparatus for detecting refrigerant leakage in an air conditioner according to an embodiment of the present invention. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] The following description, with reference to the accompanying drawings, outlines a method for detecting refrigerant leakage in an air conditioner, a computer-readable storage medium, an air conditioner, and an apparatus for detecting refrigerant leakage in an air conditioner, according to embodiments of the present invention.

[0035] Figure 1 This is a flowchart of a method for detecting refrigerant leakage in an air conditioner according to an embodiment of the present invention.

[0036] In one embodiment of the present invention, the air conditioner in cooling mode is as follows: Figure 2 As shown, the air conditioner includes an outdoor unit and an indoor unit. Liquid refrigerant flowing out from the outdoor heat exchanger flows into the indoor heat exchanger through the liquid pipes of the outdoor heat exchanger and the indoor unit, where it evaporates and absorbs heat. The resulting low-pressure gas flows through the indoor unit's gas pipe into a reversing valve and then into an energy storage unit. The energy storage unit is connected to the compressor. The low-pressure gas is compressed by the compressor to generate high-pressure gas, which flows back to the outdoor heat exchanger through the reversing valve. The high-pressure gas condenses and releases heat in the outdoor heat exchanger to generate high-pressure liquid. A throttling valve 2 is installed on the liquid pipe of the outdoor heat exchanger, and a throttling valve 1 is installed on the liquid pipe of the indoor unit. Thus, the high-pressure liquid generated in the outdoor heat exchanger sequentially passes through throttling valves 2 and 1 to generate low-pressure liquid, which flows into the indoor heat exchanger, thus circulating for cooling operation. Furthermore, a heat exchanger is installed in the outdoor unit between the liquid pipe of the outdoor heat exchanger and the inlet of the energy storage unit. In this embodiment, a plate heat exchanger is used. One end of the plate heat exchanger is connected to the liquid pipe of the outdoor heat exchanger and is equipped with a throttling valve 3, while the other end is connected to the suction pipe of the energy storage unit. (Continue referring to...) Figure 2 The reversing valve connects the indoor unit's gas pipe to the energy storage tank's suction pipe in cooling mode, and the compressor's outlet to the outdoor heat exchanger. When the air conditioner is in heating mode, such as... Figure 3As shown, the indoor unit gas pipe is connected to the compressor outlet through the reversing valve, and the outdoor unit is connected to the energy accumulator suction pipe. When the air conditioner operates in the heating mode, the gas discharged by the compressor enters the indoor heat exchanger to be condensed to generate high-pressure liquid, which successively passes through the throttling valve 1 of the indoor unit liquid pipe and the throttling valve 2 of the outdoor heat exchanger liquid pipe to generate low-pressure liquid to flow into the outdoor heat exchanger, evaporate to obtain low-pressure gas, and then enter the energy accumulator through the suction pipe and flow into the compressor through the discharge pipe of the energy accumulator, thereby forming a heating cycle.

[0037] Further, taking the cooling mode as an example, the operation of the air conditioner will produce a Mollier diagram as shown in Figure 4 , that is, the refrigerant at point A absorbs heat through the evaporator (indoor heat exchanger) to become low-pressure gas to reach point B, and then is compressed by the compressor to reach point C to become high-pressure gas. At this time, the state of the refrigerant entering the condenser (outdoor heat exchanger) is superheated, and the heat of the refrigerant is discharged to the cooling medium (water or air) through the condenser to become high-pressure liquid to point D, and then reaches point A through the throttling device (throttling valve A and throttling valve B). When the refrigerant amount is reasonable, insufficient, and very insufficient, the Mollier diagrams shown in Figure 4 will be produced.

[0038] It should be noted that the air conditioner also includes a type connected to multiple indoor units, and the following will be described in detail taking the multi-connected air conditioning system as an example.

[0039] As shown in Figure 1 , the method for detecting refrigerant leakage of the air conditioner according to the embodiment of the present application comprises the following steps:

[0040] S1, determining the operation mode of the air conditioner, the indoor temperature, the outdoor temperature, and the indoor unit operating capacity when the air conditioner is normally operating.

[0041] Specifically, continuing to refer to Figure 2 , the operation mode of the air conditioner can be determined to be the heating mode or the cooling mode according to the control option selected by the user, the indoor temperature can be obtained through the indoor unit suction temperature sensor, the outdoor temperature can be obtained through the outdoor temperature sensor arranged outside the outdoor heat exchanger or at the air inlet, and the indoor unit operating capacity can be calculated according to the number of indoor units currently operating and the total number of indoor units in the air conditioner.

[0042] S2, combining the operation mode, the indoor temperature, the outdoor temperature, and the indoor unit operating capacity to obtain a plurality of parameter groups.

[0043] That is, the running state of the air conditioner is divided into multiple groups by combinations of the running mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity. The combination manner can adopt a combination of numerical values and numerical values, or a combination of numerical values and intervals, etc.

[0044] According to one embodiment of the present application, the running mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity are combined to obtain multiple parameter groups, including: combining the running mode, different intervals of the indoor temperature, different intervals of the outdoor temperature and different intervals of the indoor unit running capacity to obtain multiple parameter groups.

[0045] Specifically, the indoor temperature, the outdoor temperature and the indoor unit running capacity are divided into intervals, and then combined with the running mode of the air conditioner to form multiple combination forms, each combination form corresponding to a parameter group. That is, each parameter group in the air conditioner includes the running mode, the outdoor temperature, the indoor temperature and the indoor unit running capacity.

[0046] According to one embodiment of the present application, the number of multiple parameter groups when the running mode is the heating mode is greater than the number of multiple parameter groups when the running mode is the cooling mode.

[0047] Specifically, when the air conditioner is in the cooling mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity can be divided into intervals according to Table 1.

[0048] Table 1

[0049]

[0050]

[0051] As can be seen from Table 1, the outdoor temperature α in the cooling mode is divided into 8 intervals, the indoor temperature β is divided into 6 intervals, and the indoor unit running capacity γ is divided into 10 intervals, 8*6*10 combination forms can be formed, and the number of parameter groups M is 480. For example, one parameter group in the cooling mode is: outdoor temperature α < 20, indoor temperature 20≤β<25, and indoor unit running capacity 0≤γ<10.

[0052] When the air conditioner is in the heating mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity can be divided into intervals according to Table 2.

[0053] Table 2

[0054] Outdoor air temperature α [°C] Indoor temperature β [°C] Indoor unit operating capacity γ [%] -25≤α<-20 β<10 0 < γ < 10 -20≤α<-15 10≤β<15 10 < γ < 20 -15≤α<-10 15≤β<20 20 < γ < 30 -10≤α<-5 20≤β<25 30 < γ < 40 -5≤α<0 25≤β<30 40 < γ < 50 0≤α<5 30≤β<35 50 < γ < 60 5≤α<10 35≤β 60 < γ < 70 10≤α<15 70 < γ < 80 15≤α<20 80 < γ < 90 20≤α 90 ≤ γ ≤ 100

[0055] As can be seen from Table 2, the outdoor temperature a in the heating mode is divided into 10 intervals, the indoor temperature β is divided into 7 intervals, and the indoor unit operating capacity γ is divided into 10 intervals, so that 10*7*10 combinations can be formed, and the number of parameter groups N is 700. For example, one parameter group in the heating mode is: outdoor temperature -25≤a<-20, indoor temperature β<10, and indoor unit operating capacity 20≤γ<30.

[0056] It should be noted that the interval division of the outdoor temperature, the indoor temperature and the indoor unit operating capacity in the above-mentioned refrigeration mode and heating mode is only an embodiment of the present application, and the interval division in different operating modes can be set according to actual conditions.

[0057] S2, obtaining the current operating parameters of the air conditioner in each parameter group.

[0058] According to an embodiment of the present application, the current operating parameters can include: the compressor operating frequency, the indoor throttling valve opening degree, the outdoor throttling valve opening degree, the outdoor fan rotating speed, the compressor suction pressure, the compressor discharge superheat and the compressor suction superheat.

[0059] Specifically, taking the example of Figure 2 the outdoor unit frequency converter outputs the compressor operating frequency, the indoor throttling valve opening degree is the opening degree of the throttling valve 1 installed at the liquid pipe of the indoor unit, that is, the inlet of the indoor heat exchanger, the outdoor throttling valve opening degree is the opening degree of the throttling valve 2 installed at the liquid pipe of the outdoor heat exchanger, that is, the outlet of the outdoor heat exchanger, the number of revolutions of the fan of the outdoor unit indicates the number of revolutions of the outdoor fan, the compressor suction pressure is obtained by the suction pressure sensor installed on the connecting pipe between the accumulator and the compressor, the suction temperature of the compressor is obtained by the suction pipe temperature sensor installed on the suction pipe of the accumulator, and the compressor suction superheat can be obtained, the discharge pressure and temperature of the compressor are obtained by the discharge pressure sensor and the discharge pipe temperature sensor arranged on the discharge pipe of the compressor, and the compressor discharge superheat can be obtained. In addition, the liquid pipe temperature before throttling and the liquid pipe temperature after throttling can also be obtained by the liquid pipe temperature sensor 1 and the liquid pipe temperature sensor 2 arranged on both sides of the throttling valve 2, as the current operating parameters of the air conditioner.

[0060] It should be noted that the current operating parameters of the air conditioner can also only include the compressor operating frequency, the indoor throttling valve opening degree, the outdoor throttling valve opening degree, the outdoor fan rotating speed, the compressor discharge superheat, or can include the indoor fan rotating speed and the like in addition to the above-mentioned compressor operating frequency, indoor throttling valve opening degree, outdoor throttling valve opening degree, outdoor fan rotating speed, compressor suction pressure, compressor discharge pressure, compressor discharge superheat and compressor suction superheat, and the specific setting can be made according to actual conditions.

[0061] According to one embodiment of the present application, determining whether the refrigerant of the air conditioner leaks according to the current operating parameters can include the following steps:

[0062] S301, when at least two current operating parameters under any parameter group meet the preset condition, determining that the refrigerant of the air conditioner under the parameter group is abnormal.

[0063] That is, the preset condition is set for the current operating parameters in each parameter group of the air conditioner respectively, and whether the refrigerant of the air conditioner under the parameter group leaks is determined by judging the number of current operating parameters meeting the preset condition.

[0064] Further, in one embodiment of the present application, judging whether the current operating parameters under each parameter group meet the preset condition can include:

[0065] S3011, taking the operating parameters under different parameter groups when the air conditioner is normally running as reference values.

[0066] That is, the operating parameters obtained in the normal running state are taken as the reference values (i.e. the preset condition) under the corresponding parameter group. The number of the above-mentioned reference values can be set according to the actual situation. For example, assuming that the number of reference values of each operating parameter is 30, taking one parameter group in the refrigeration mode as an example: outdoor temperature α < 20, indoor temperature 20 ≤ β < 25, and indoor unit running capacity 0 ≤ γ < 10, when it is determined that the air conditioner is normally running in the refrigeration mode, every 3 minutes, the above-mentioned operating parameters are obtained under the condition of outdoor temperature α < 20, indoor temperature 20 ≤ β < 25, and indoor unit running capacity 0 ≤ γ < 10, when the number of reference values of each operating parameter is greater than or equal to 30, it is determined that the reference value acquisition of the parameter group is completed, and so on. The reference values corresponding to all parameter groups are obtained and stored to form a database.

[0067] In addition, it should be noted that the installation conditions of the outdoor unit and the length of the pipe and other external factors will cause the operating data in the air conditioner to be different at many times, so the setting conditions of each air conditioner need to be corrected and tested. When the air conditioner is set and determined to be normally running through the test, it is determined that the air conditioner is in the normal running stage, and the operating parameters obtained at this time do not need to be corrected, that is, the normal data is obtained in the normal running stage after the air conditioner is set and tested.

[0068] S3012, obtaining the current operating parameters of the air conditioner under any parameter group, and comparing the current operating parameters of the air conditioner under any parameter group with the reference values under the parameter group to obtain whether the current operating parameters of the air conditioner under each parameter group meet the preset condition.

[0069] In other words, once the above reference values ​​have been obtained, the obtained reference values ​​are used as preset conditions to start refrigerant leak detection, and the current operating parameters of the air conditioner are compared with the reference values ​​under the corresponding parameter group.

[0070] Specifically, during operation, based on the air conditioner's operating mode, the current outdoor temperature obtained by the outdoor temperature sensor, the current indoor temperature obtained by the indoor unit's intake temperature sensor, and the current operating capacity determined by the number of indoor units operating in a multi-split system, the current parameter group of the air conditioner is determined. The database corresponding to the current parameter group is called to obtain the corresponding reference value. Then, the current operating parameters of the air conditioner obtained in real time are compared with the reference value to obtain the relationship between the current operating parameters of the air conditioner and the reference value, and to determine whether the current operating parameters under the current parameter group meet the preset conditions.

[0071] It should be noted that since indoor and outdoor temperatures change with time and the flow of people, the current parameter group of the air conditioner will also change. This allows for the determination of whether the current operating parameters of the air conditioner in multiple parameter groups meet the preset conditions. At the same time, the working mode and operating capacity of the air conditioner can also be selected by the user. Thus, according to the preset parameter group settings in Table 1 or Table 2, it is possible to obtain whether the current operating parameters of the air conditioner in each parameter group meet the preset conditions.

[0072] It should be further explained that refrigerant leakage will cause changes in the current operating parameters of the air conditioner. Whether the current operating parameters of the air conditioner meet the preset conditions can be determined by comparing the current operating parameters with reference values, classifying the trends of change in the obtained current operating parameters, and guiding the determination of whether the preset conditions are met. The changes in the operating parameters of the air conditioner can be obtained through data analysis. In one embodiment of the present invention, the following method is used... Figure 5 The T-test shown is used to determine the dispersion of the air conditioner's current operating parameters relative to a reference value, and then derives the trend of the air conditioner's current operating parameters. In other words, the current operating parameters of the air conditioner are compared with the reference value, and the oscillation of the distribution is used to determine whether the current operating parameters are in a state of A (decreasing) or B (increasing). If the trend of the current operating parameters continues to shift in the direction of change for more than 10 minutes, then the condition is considered true. The T-test is a set of statistical test methods that utilizes the fact that the statistic follows a t-distribution when the null hypothesis is true.

[0073] As an implementable case of the present application, when the number of acquired working parameters in the parameter group reaches the preset number, the reference value acquisition is determined to be completed, and if the air conditioner is still in the parameter group, the refrigerant leakage detection of the parameter group is automatically started by default, that is, the subsequently acquired running parameters are compared with the reference value as the current running parameters of the air conditioner to determine whether the current running parameters in the parameter group meet the preset condition, which is used for subsequent refrigerant leakage detection.

[0074] According to an embodiment of the present application, when the running mode is the cooling mode, the preset condition includes: the compressor running frequency is greater than a first frequency reference value; the indoor throttling valve opening is greater than a first opening reference value; the outdoor throttling valve opening is greater than a second opening reference value; the outdoor fan rotating speed is greater than a first rotating speed reference value; the compressor suction pressure is less than a first pressure reference value; the compressor discharge superheat is greater than a first discharge superheat reference value; and the compressor suction superheat is greater than a first suction superheat reference value.

[0075] Specifically, when the refrigerant leaks in the cooling mode, the refrigerant amount decreases, the compressor suction pressure decreases, and thus the compressor suction superheat increases. In order to increase the refrigerant circulation amount, the compressor running frequency increases, which increases the compressor discharge superheat. In order to prevent the decrease of the indoor heat exchange amount caused by the decrease of the refrigerant amount, the outdoor fan rotating speed is increased to increase the condensation amount. In order to increase the refrigerant circulation amount, the opening of the indoor throttling valve and the outdoor throttling valve is increased. Therefore, the compressor running frequency greater than the corresponding first frequency reference value, the indoor throttling valve opening greater than the corresponding first opening reference value, the outdoor throttling valve opening greater than the corresponding second opening reference value, the outdoor fan rotating speed greater than the corresponding first rotating speed reference value, the compressor suction pressure less than the corresponding first pressure reference value, the compressor discharge superheat greater than the corresponding first discharge superheat reference value, and the compressor suction superheat greater than the corresponding first suction superheat reference value are used as the preset condition in any parameter group. If two or more of the current running parameters of the air conditioner meet the above preset condition, it is determined that the refrigerant of the air conditioner in the parameter group in the cooling mode is abnormal.

[0076] According to an embodiment of the present application, when the running mode is the heating mode, the preset condition includes: the compressor running frequency is greater than a second frequency reference value; the indoor throttling valve opening is less than a third opening reference value; the outdoor throttling valve opening is greater than a fourth opening reference value; the outdoor fan rotating speed is greater than a second rotating speed reference value; the compressor suction pressure is less than a second pressure reference value; the compressor discharge superheat is greater than a second discharge superheat reference value; and the compressor suction superheat is greater than a second suction superheat reference value.

[0077] Specifically, when refrigerant leaks in the heating mode, the amount of refrigerant decreases, the suction pressure of the compressor decreases, and thus the suction superheat of the compressor increases. In an attempt to increase the refrigerant circulation amount, the frequency of the compressor increases, which increases the discharge superheat of the compressor. In an attempt to increase the refrigerant circulation amount, the opening of the indoor throttle increases, and in an attempt to maintain the heating capacity of the indoor heat exchanger, the opening of the outdoor throttle decreases. In order to compensate for the decrease in the amount of refrigerant, the refrigerant circulation amount is increased by the action of other actuators. With this action, in order to increase the pressure of the outdoor heat exchanger, i.e., the evaporator, the number of revolutions of the outdoor fan increases. When determining the refrigerant leakage in the heating mode, first, the second frequency reference value, the third opening reference value, the fourth opening reference value, the second speed reference value, the second pressure reference value, the second discharge superheat reference value, and the second suction superheat reference value are set according to the parameter group, and the predetermined condition is set according to the parameter group. When the number of current operating parameters of the air conditioner that satisfy the predetermined condition is greater than or equal to two, it is determined that the refrigerant of the air conditioner in the parameter group is abnormal.

[0078] S302, when the number of parameter groups in which the refrigerant is abnormal reaches a preset value, it is determined that the air conditioner leaks refrigerant. The preset value can be set according to actual conditions.

[0079] Specifically, taking 3 as an example, the refrigerant leakage of multiple parameter groups is detected and determined as the air conditioner operates. When the number of parameter groups in which the refrigerant is abnormal is greater than or equal to 3, it is determined that the air conditioner leaks refrigerant.

[0080] It should be noted that because the state of the refrigerant is unstable when the air conditioner starts after the defrosting operation mode and the oil return operation mode end, the refrigerant leakage detection process is usually not performed within 30 minutes after the air conditioner starts, i.e., from the stop state to the start of operation. In addition, when the air conditioner operates in a protection operation mode for protecting the machine or other operation modes different from the normal cooling or heating operation mode, the detection process is also not performed.

[0081] Further, when the refrigerant leaks, the refrigerating machine oil also flows out, so there is a possibility of compressor wear. By the above refrigerant leakage detection, the wear of the compressor can be prevented, thus preventing the influence on the entire system, and the air conditioner can be repaired before the problem of temperature drop or temperature rise occurs. In addition, special operation is not required for refrigerant leakage detection, and by combining the operation mode, the indoor temperature, the outdoor temperature, and the indoor unit operation capacity, the change in the refrigerant flow is subdivided, and the data judgment accuracy is improved.

[0082] As a specific embodiment of the present application, as Figure 6As shown, the method for detecting refrigerant leakage of an air conditioner according to the embodiment of the present application comprises the following steps:

[0083] S101, the air conditioner is normally operated.

[0084] S102, a parameter group is acquired.

[0085] S103, a reference value under the parameter group is acquired.

[0086] S104, a current operating parameter of the air conditioner under the parameter group is acquired.

[0087] S105, it is judged whether the current operating parameter satisfies a preset condition. If yes, step S106 is executed; if no, step S102 is executed.

[0088] S106, it is judged whether the number of current operating parameters satisfying the preset condition under the parameter group is greater than or equal to 2. If yes, it is determined that the refrigerant of the air conditioner under the parameter group is abnormal, and step S107 is executed; if no, the refrigerant of the air conditioner under the parameter group is normal, and step S102 is executed.

[0089] S107, it is judged whether the number of parameter groups in which the refrigerant of the air conditioner is abnormal is greater than or equal to 3. If yes, step S108 is executed; if no, step S109 is executed.

[0090] S108, the air conditioner has refrigerant leakage.

[0091] S109, it is judged whether the refrigerant detection of all parameter groups of the air conditioner is completed. If yes, step S110 is executed; if no, step S102 is executed.

[0092] S110, the air conditioner has no refrigerant leakage.

[0093] In summary, according to the method for detecting refrigerant leakage of an air conditioner according to the embodiment of the present application, firstly, when the air conditioner is normally operated, the operating mode, indoor temperature, outdoor temperature and indoor unit operating capacity of the air conditioner are determined, the operating mode, indoor temperature, outdoor temperature and indoor unit operating capacity are combined, a plurality of parameter groups are obtained, then the current operating parameter of the air conditioner under each parameter group is determined, and whether the refrigerant of the air conditioner leaks is determined according to the current operating parameter. Thus, the method obtains a plurality of parameter groups by combining the operating mode, indoor temperature, outdoor temperature and indoor unit operating capacity of the air conditioner, and judges whether the refrigerant leaks according to the current operating parameter under each parameter group, thereby subdividing the change of refrigerant flow, and improving the judgment accuracy of refrigerant leakage.

[0094] Corresponding to the above embodiment, the present application further provides a computer readable storage medium.

[0095] The computer readable storage medium of the embodiment of the present application, which stores the program for detecting the refrigerant leakage of the air conditioner, when executed by the processor, implements the above-mentioned method for detecting the refrigerant leakage of the air conditioner.

[0096] The computer readable storage medium of the embodiment of the present application, when executed by the processor, first executes the above-mentioned method for detecting the refrigerant leakage of the air conditioner, thereby improving the judgment accuracy of the refrigerant leakage.

[0097] Corresponding to the above-mentioned embodiment, the present application further provides an air conditioner.

[0098] As shown in Figure 7 The air conditioner 100 of the embodiment of the present application comprises a storage 110, a processor 120, and a program for detecting the refrigerant leakage of the air conditioner stored in the storage 110 and executable on the processor 120, and when the processor 120 executes the program for detecting the refrigerant leakage of the air conditioner, the above-mentioned method for detecting the refrigerant leakage of the air conditioner is implemented.

[0099] The air conditioner of the embodiment of the present application, when the processor executes the program for detecting the refrigerant leakage of the air conditioner stored in the storage, implements the above-mentioned method for detecting the refrigerant leakage of the air conditioner, thereby improving the judgment accuracy of the refrigerant leakage.

[0100] Corresponding to the above-mentioned embodiment, the present application further provides a device for detecting the refrigerant leakage of the air conditioner.

[0101] As shown in Figure 8 The device for detecting the refrigerant leakage of the air conditioner of the embodiment of the present application can comprise a determination module 10 and a detection module 20.

[0102] The determination module 10 is configured to determine the operation mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity of the air conditioner when the air conditioner is normally running, and combine the operation mode, the indoor temperature, the outdoor temperature and the indoor unit running capacity to obtain a plurality of parameter groups, and determine the current operation parameter of the air conditioner under each parameter group. The detection module 20 is configured to determine whether the refrigerant of the air conditioner leaks according to the current operation parameter.

[0103] According to one embodiment of the present application, the determination module 10 combines the operation mode, the different intervals of the indoor temperature, the different intervals of the outdoor temperature and the different intervals of the indoor unit running capacity to obtain a plurality of parameter groups.

[0104] According to one embodiment of the present application, the number of parameter groups when the operation mode is the heating mode is greater than the number of parameter groups when the operation mode is the cooling mode.

[0105] According to one embodiment of the present application, the current operation parameters include: the compressor operation frequency, the indoor throttle valve opening, the outdoor throttle valve opening, the outdoor fan rotating speed, the compressor suction pressure, the compressor discharge superheat and the compressor suction superheat.

[0106] According to one embodiment of the present application, the detection module 20 determines whether the refrigerant of the air conditioner leaks according to the current operation parameters, and specifically is configured to: determine that the refrigerant of the air conditioner in the parameter group is abnormal when at least two current operation parameters under any parameter group meet the preset condition; and determine that the air conditioner leaks the refrigerant when the number of parameter groups in which the refrigerant is abnormal reaches a preset value.

[0107] According to one embodiment of the present application, when the operation mode is the cooling mode, the preset condition includes: the compressor operation frequency is greater than a first frequency reference value; the indoor throttle valve opening is greater than a first opening reference value; the outdoor throttle valve opening is greater than a second opening reference value; the outdoor fan rotating speed is greater than a first rotating speed reference value; the compressor suction pressure is less than a first pressure reference value; the compressor discharge superheat is greater than a first discharge superheat reference value; and the compressor suction superheat is greater than a first suction superheat reference value.

[0108] According to one embodiment of the present application, when the operation mode is the heating mode, the preset condition includes: the compressor operation frequency is greater than a second frequency reference value; the indoor throttle valve opening is less than a third opening reference value; the outdoor throttle valve opening is greater than a fourth opening reference value; the outdoor fan rotating speed is greater than a second rotating speed reference value; the compressor suction pressure is less than a second pressure reference value; the compressor discharge superheat is greater than a second discharge superheat reference value; and the compressor suction superheat is greater than a second suction superheat reference value.

[0109] It should be noted that details not disclosed in the device for detecting the refrigerant leakage of the air conditioner in the embodiments of the present application can refer to the details disclosed in the method for detecting the refrigerant leakage of the air conditioner in the above-mentioned embodiments of the present application, which will not be described here in detail.

[0110] The device for detecting refrigerant leakage of an air conditioner according to the embodiment of the present application determines the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity of the air conditioner when the air conditioner is normally running through the determining module, and combines the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity to obtain a plurality of parameter groups, and determines the current operation parameter of the air conditioner under each parameter group, and the detecting module determines whether the refrigerant of the air conditioner leaks according to the current operation parameter, so that the device obtains a plurality of parameter groups through the combination of the operation mode, indoor temperature, outdoor temperature and indoor unit running capacity of the air conditioner, and judges whether the refrigerant leaks according to the current operation parameter under each parameter group, thereby subdividing the change of the refrigerant flow, and improving the judgment accuracy of the refrigerant leakage.

[0111] It should be noted that the logic and / or steps represented in the flowcharts, or otherwise described herein, can be considered as a list of executable instructions for implementing logic functions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus or device, such as a computer-based system, a system including a processor or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or in conjunction with these instruction execution systems, apparatus or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate or transport a program for use by or in connection with an instruction execution system, apparatus or device, or in conjunction with these instruction execution systems, apparatus or devices. More specific examples (a non-exhaustive list) of computer-readable medium include the following: an electrical connection having one or more wires (electrical devices), a portable computer diskette (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, a computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by electronic conversion of the optical scanning into a tangible form, and then editing, interpreting or otherwise processing the program into a form that can be stored in a computer memory.

[0112] It should be understood that portions of the present application can be realized with a hardware, software, firmware or a combination thereof. In the above-described embodiments, a plurality of steps or methods can be realized with software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if realized with hardware, and as in another embodiment, it can be realized with any one or a combination of the following technologies known in the art: discrete logic circuit having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0113] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0114] In addition, the terms "first", "second", "third", etc. are used only for the purpose of description and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0115] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0116] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A method for detecting a refrigerant leakage of an air conditioner, characterized by, include: When the air conditioner is operating normally, determine the air conditioner's operating mode, indoor temperature, outdoor temperature, and indoor unit operating capacity; The operating mode, indoor temperature, outdoor temperature, and indoor unit operating capacity are combined to obtain multiple parameter sets; Obtain the current operating parameters of the air conditioner under each parameter group; Determine whether the refrigerant in the air conditioner is leaking based on the current operating parameters; The current operating parameters include: compressor operating frequency, indoor throttle valve opening, outdoor throttle valve opening, outdoor fan speed, compressor suction pressure, compressor discharge superheat, and compressor suction superheat. The step of determining whether the refrigerant of the air conditioner is leaking based on the current operating parameters includes: determining that the refrigerant of the air conditioner is abnormal under any parameter group when at least two of the current operating parameters under any parameter group meet preset conditions; and determining that the air conditioner is leaking refrigerant when the number of parameter groups with abnormal refrigerant reaches a preset value.

2. The method of claim 1, wherein, By combining the operating mode, indoor temperature, outdoor temperature, and indoor unit operating capacity, multiple parameter sets are obtained, including: The operating mode, different ranges of indoor temperature, different ranges of outdoor temperature, and different ranges of indoor unit operating capacity are combined to obtain the multiple parameter groups.

3. The method of claim 2, wherein, in, The number of parameter groups when the operating mode is heating mode is greater than the number of parameter groups when the operating mode is cooling mode.

4. The method of claim 1, wherein, When the operating mode is cooling mode, the preset conditions include: The compressor operates at a frequency greater than a first frequency reference value; The opening degree of the indoor throttle valve is greater than the first opening reference value; The opening degree of the outdoor throttle valve is greater than the second opening reference value; The outdoor fan speed is greater than the first speed reference value; The compressor's suction pressure is less than the first pressure reference value; The compressor exhaust superheat is greater than the first exhaust superheat reference value; The compressor's intake superheat is greater than the first intake superheat reference value.

5. The method of claim 1, wherein, When the operating mode is heating mode, the preset conditions include: The compressor operates at a frequency greater than the second frequency reference value; The opening degree of the indoor throttle valve is less than the third opening degree reference value; The opening degree of the outdoor throttle valve is greater than the fourth opening degree reference value; The outdoor fan speed is greater than the second speed reference value; The compressor's suction pressure is less than the second pressure reference value; The superheat of the compressor exhaust is greater than the second exhaust superheat reference value; The compressor's suction superheat is greater than the second suction superheat reference value.

6. A computer-readable storage medium, characterized in that, It stores a program for detecting refrigerant leakage in an air conditioner, which, when executed by a processor, implements the method for detecting refrigerant leakage in an air conditioner according to any one of claims 1-5.

7. An air conditioner, characterized in that, The method includes a memory, a processor, and a program for detecting refrigerant leakage in an air conditioner, which is stored in the memory and can be run on the processor. When the processor executes the program for detecting refrigerant leakage in an air conditioner, it implements the method for detecting refrigerant leakage in an air conditioner according to any one of claims 1-5.

8. A device for detecting refrigerant leakage in an air conditioner, characterized in that, include: The determination module is used to determine the operating mode, indoor temperature, outdoor temperature and indoor unit operating capacity of the air conditioner when the air conditioner is operating normally, and to combine the operating mode, indoor temperature, outdoor temperature and indoor unit operating capacity to obtain multiple parameter groups, and to determine the current operating parameters of the air conditioner under each parameter group; The current operating parameters include: compressor operating frequency, indoor throttle valve opening, outdoor throttle valve opening, outdoor fan speed, compressor suction pressure, compressor discharge superheat, and compressor suction superheat. The detection module is used to determine whether the air conditioner is leaking refrigerant based on the current operating parameters, including: determining that the refrigerant in the air conditioner is abnormal under any parameter group when at least two of the current operating parameters under any parameter group meet preset conditions; and determining that the air conditioner is leaking refrigerant when the number of parameter groups with abnormal refrigerant reaches a preset value.

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