Method, device, air conditioner and storage medium for determining one-way valve failure

Abstract

The present application relates to the technical field of intelligent household appliances, and discloses a method for determining a check valve fault, including: obtaining the operating mode of an air conditioner and preset parameters before and after the check valve; calculating the difference between the preset parameters before and after the check valve; and determining the fault condition of the check valve according to the operating mode and the difference of the preset parameters. In this way, it is possible to determine whether the corresponding check valve in the variable flow splitting structure fails and the specific fault type. So that when the check valve fails, it can be detected in time to ensure the normal operation of the air conditioner. The present application also discloses a device, an air conditioner and a storage medium for determining a check valve fault.

Description

Technical Field

[0001] This application relates to the technical field of intelligent household appliances, for example, to a method, a device, an air conditioner, and a storage medium for determining a one-way valve failure. Background Art

[0002] The realization of the variable flow splitting function of an air conditioner depends on the on-off control of a one-way valve. By opening and closing the one-way valve, the parallel or series connection of the heat exchange pipelines of the heat exchanger is realized, thereby changing the flow path of the refrigerant in the heat exchanger. If problems such as the one-way valve cannot be opened, cannot be closed tightly, or the refrigerant flow is not smooth, the flow rate is inaccurate, or the flow rate fluctuates occur, it will affect the flow splitting, and then affect the heat exchange performance of the heat exchanger, the energy efficiency of the air conditioner, and even the reliability of the air conditioner.

[0003] A method for detecting and handling faults of an air conditioner's subcooling tube group is disclosed in the related art, including: turning on the air conditioner for heating; recording the time required for the exhaust temperature of the compressor to stabilize from the start of heating; determining whether the stabilization time is less than a first preset time; if so, detecting the inlet air temperature and the outlet air temperature of the indoor unit of the air conditioner, and calculating the temperature difference between the two; determining whether the temperature difference is less than a first preset temperature difference; and if so, determining that the one-way valve in the subcooling tube group fails.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] The function of the one-way valve in the related art in the air conditioner system is to change the capillary length in air conditioners with different capillary lengths for refrigeration and heating. Its essence is a throttling device. This fault detection method is also applicable to the throttling device, so the exhaust temperature can be used to troubleshoot faults. However, the function of the one-way valve in the variable flow splitting structure is not throttling, but on-off. Therefore, the solutions in the related art are not applicable to the fault troubleshooting of the one-way valve in the variable flow splitting structure. Summary of the Invention

[0006] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the following detailed description.

[0007] Embodiments of the present disclosure provide a method, a device, an air conditioner, and a storage medium for determining a one-way valve failure, so as to propose a solution applicable to the fault troubleshooting of the one-way valve in the variable flow splitting structure.

[0008] In some embodiments, the method includes: obtaining the operating mode of the air conditioner and preset parameters before and after the one-way valve; calculating the difference between the preset parameters before and after the one-way valve; and determining the fault condition of the one-way valve according to the operating mode and the difference of the preset parameters.

[0009] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned method for determining the check valve failure when running the program instructions.

[0010] In some embodiments, the air conditioner includes the device for determining the check valve failure as described above.

[0011] In some embodiments, the storage medium stores program instructions, and the program instructions execute the aforementioned method for determining the check valve failure when running.

[0012] The method, device, air conditioner, and storage medium for determining the check valve failure provided by the embodiments of the present disclosure can achieve the following technical effects:

[0013] Obtain the operating mode of the air conditioner and the preset parameters before and after the check valve, and calculate the difference between the preset parameters before and after the check valve. Determine whether the magnitude of the difference is within the normal difference range corresponding to the current operating mode, so as to determine whether the corresponding check valve in the variable flow splitting structure fails and the specific failure type. So as to be able to detect in time when the check valve fails and ensure the normal operation of the air conditioner.

[0014] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0015] One or more embodiments are exemplarily illustrated by the corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0016] Figure 1 is a schematic structural diagram of a heat exchanger provided by the embodiments of the present disclosure;

[0017] Figure 2 is a schematic diagram of a method for determining the check valve failure provided by the embodiments of the present disclosure;

[0018] Figure 3 is a schematic diagram of another method for determining the check valve failure provided by the embodiments of the present disclosure;

[0019] Figure 4 is a schematic diagram of another method for determining the check valve failure provided by the embodiments of the present disclosure;

[0020] Figure 5 is a schematic diagram of another method for determining the check valve failure provided by the embodiments of the present disclosure;

[0021] Figure 6 It is a schematic diagram of another method provided by an embodiment of the present disclosure for determining the failure of a one-way valve;

[0022] Figure 7 It is a schematic diagram of a device provided by an embodiment of the present disclosure for determining the failure of a one-way valve;

[0023] Figure 8 It is a schematic diagram of another device provided by an embodiment of the present disclosure for determining the failure of a one-way valve.

[0024] Reference numerals:

[0025] 10, heat exchanger; 11, first liquid distributor; 12, second liquid distributor; 13, third liquid distributor; 14, fourth liquid distributor; 15, first heat exchange branch; 16, second heat exchange branch; 17, third heat exchange branch; 18, first bypass pipeline; 181, first one-way valve; 19, second bypass pipeline; 191, second one-way valve; 20, four-way valve; 30, first main pipe; 40, second main pipe. Detailed implementation manners

[0026] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and explanation, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner.

[0027] In the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0028] Unless otherwise specified, the term "plurality" means two or more.

[0029] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0030] The term "and / or" is an associative relationship describing an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B these three relationships.

[0031] The term "corresponding" may refer to an association relationship or a binding relationship. That A corresponds to B means that there is an association relationship or a binding relationship between A and B.

[0032] Combined Figure 1 As shown, an embodiment of the present disclosure provides a heat exchanger 10, including: a first liquid distributor 11, a second liquid distributor 12, a third liquid distributor 13, a fourth liquid distributor 14, and a heat exchange pipeline.

[0033] The heat exchange pipeline includes: a first heat exchange branch 15, a second heat exchange branch 16, and a third heat exchange branch 17.

[0034] The liquid collecting end of the first liquid distributor 11 is connected to the indoor heat exchanger through a first main pipe 30.

[0035] The liquid distributing end of the first liquid distributor 11 is connected to the first end of the first heat exchange branch 15. The liquid distributing end of the first liquid distributor 11 is also connected to the liquid collecting end of the second liquid distributor 12 through a first bypass pipeline 18. A first one-way valve 181 is provided on the first bypass pipeline 18 to limit the refrigerant in the first bypass pipeline 18 to flow only from the first liquid distributor 11 to the second liquid distributor 12.

[0036] The liquid distributing end of the second liquid distributor 12 is connected to the first end of the second heat exchange branch 16. The liquid distributing end of the second liquid distributor 12 is also connected to the first end of the third heat exchange branch 17.

[0037] The second end of the first heat exchange branch 15 is connected to the liquid distributing end of the third liquid distributor 13. The second end of the second heat exchange branch 16 is connected to the liquid distributing end of the third liquid distributor 13. The liquid collecting end of the third liquid distributor 13 is connected to the liquid distributing end of the fourth liquid distributor 14 through a second bypass pipeline 19. A second one-way valve 191 is provided on the second bypass pipeline 19 to limit the refrigerant in the second bypass pipeline 19 to flow only from the third liquid distributor 13 to the fourth liquid distributor 14.

[0038] The second end of the third heat exchange branch 17 is connected to the liquid distributing end of the fourth liquid distributor 14. The liquid collecting end of the fourth liquid distributor 14 is connected to a four-way valve 20 through a second main pipe 40.

[0039] When the air conditioner operates in the heating mode, the refrigerant flows in from the first main pipe 30. Under the liquid distribution action of the first liquid distributor 11 and the second liquid distributor 12, it flows into the first heat exchange branch 15, the second heat exchange branch 16, and the third heat exchange branch 17 respectively. Then it converges in the second main pipe 40 and flows into the four-way valve 20. In this way, each heat exchange branch is in parallel.

[0040] When the air conditioner operates in the cooling mode, the refrigerant flows in from the second main pipe 40. Under the blocking action of the first check valve 181 and the second check valve 191, it flows into the third heat exchange branch 17, the second heat exchange branch 16, and the first heat exchange branch 15 in sequence. Finally, it flows into the indoor heat exchanger through the first main pipe 30. In this way, each heat exchange branch is connected in series.

[0041] Combined with Figure 2 As shown, an embodiment of the present disclosure provides a method for determining the failure of a check valve, including:

[0042] S201, the air conditioner obtains its operating mode and preset parameters before and after the check valve.

[0043] S202, the air conditioner calculates the difference between the preset parameters before and after the check valve.

[0044] S203, the air conditioner determines the failure condition of the check valve according to the operating mode and the difference between the preset parameters.

[0045] Sensors are arranged at the front and rear positions of each check valve to obtain the preset parameters before and after the corresponding check valve. Among them, the preset parameters can be temperature or pressure. If the preset parameter is temperature, the sensor is a temperature sensor. If the preset parameter is pressure, the sensor is a pressure sensor. At the same time, the operating mode of the air conditioner is obtained. Here, the cooling mode and the heating mode are mainly distinguished. This is because when the air conditioner operates in the cooling mode, the check valve needs to be closed, that is, no leakage occurs. When the air conditioner operates in the heating mode, the check valve needs to be fully opened. That is to say, when the air conditioner operates in different modes, different requirements are imposed on the on-off state of the check valve. In addition, when the air conditioner operates in the self-cleaning mode, the frosting stage is equivalent to the heating mode, and the defrosting stage is equivalent to the cooling mode. Therefore, when the air conditioner operates in the self-cleaning mode, it is necessary to determine the corresponding operating mode according to its operating stage.

[0046] The sensor is communicatively connected to the processor of the air conditioner to transmit the obtained temperature or pressure to the processor. Then the processor calculates the difference between the preset parameters before and after the same check valve, that is, calculates the temperature difference or the pressure difference. The failure condition of the check valve is determined according to the operating mode of the air conditioner and the difference between the preset parameters.

[0047] In an embodiment of the present disclosure, the operating mode of the air conditioner and the preset parameters before and after the check valve are obtained, and the difference between the preset parameters before and after the check valve is calculated. It is judged whether the magnitude of the difference is within the normal difference range corresponding to the current operating mode, so as to determine whether the check valve in the variable flow splitting structure fails and the specific failure type. So as to be able to detect in time when the check valve fails and ensure the normal operation of the air conditioner.

[0048] Combined with Figure 3 As shown, an embodiment of the present disclosure provides another method for determining the failure of a check valve, including:

[0049] S201, the air conditioner obtains its operating mode and preset parameters before and after the check valve.

[0050] S202, the air conditioner calculates the difference between the preset parameters before and after the check valve.

[0051] S213, the air conditioner obtains the operating frequency of the compressor.

[0052] S223, the air conditioner determines a target difference threshold according to the operating frequency.

[0053] S233, the air conditioner determines the fault condition of the check valve according to the operating mode, the difference between the preset parameters, and the target difference threshold.

[0054] Obtain the current operating frequency of the compressor. Different operating frequencies result in different differences between the preset parameters. This is because the greater the operating frequency, the greater the refrigerant flow rate, and the greater the difference between the preset parameters before and after the check valve. Determine the fault condition of the check valve according to the operating mode and the magnitude relationship between the difference between the preset parameters and the target difference threshold. In this way, based on the operating frequency of the compressor, a matching target difference threshold is determined, so as to accurately determine the fault condition of the check valve.

[0055] Optionally, in step S223, the air conditioner determines a target difference threshold according to the operating frequency, including:

[0056] The air conditioner determines the target difference threshold corresponding to the current operating frequency according to the correlation between the frequency and the difference threshold.

[0057] The correlation between the frequency and the difference threshold is stored in the processor of the air conditioner. The correlation includes one or more corresponding relationships between the frequency and the difference threshold. If the preset parameter is temperature, the target difference threshold is the target temperature difference threshold. If the preset parameter is pressure, the target difference threshold is the target pressure difference threshold. The larger the interval in which the operating frequency is located, the larger the temperature difference threshold or the pressure difference threshold. For details, see Table 1.

[0058] Table 1 Correlation between frequency and difference threshold

[0059] Operating frequency (Hz) Temperature difference threshold (°C) Pressure difference threshold (Pa) (10,20] <![CDATA[T1]]> <![CDATA[P1]]> (20,30] <![CDATA[T2]]> <![CDATA[P2]]> (30,40] <![CDATA[T3]]> <![CDATA[P3]]> … … … (90,100] <![CDATA[T n-1 > <![CDATA[P n-1 > (100,120] <![CDATA[T n > <![CDATA[P n >

[0060] In Table 1, T1>T2>…>T n , P1>P2>…>P n . If the current operating frequency is 30Hz, the temperature difference threshold is determined to be T2, and the pressure difference threshold is determined to be P2.

[0061] Combined with Figure 4 As shown, another method for determining the fault of the check valve provided by the embodiments of the present disclosure includes:

[0062] S201, the air conditioner obtains its operating mode and the preset parameters before and after the check valve.

[0063] S202, the air conditioner calculates the difference between the preset parameters before and after the check valve.

[0064] S213, the air conditioner obtains the operating frequency of the compressor.

[0065] S223, the air conditioner determines the target difference threshold according to the operating frequency.

[0066] S2133, when the operating mode of the air conditioner is the cooling mode, and the difference between the preset parameters is less than the target difference threshold and greater than the parameter setting value, it is determined that the check valve has a leakage fault.

[0067] S2233, when the operating mode of the air conditioner is the cooling mode, and the difference between the preset parameters is less than the parameter setting value, it is determined that the check valve has a full-open and non-closable fault; wherein, the parameter setting value is less than the target difference threshold.

[0068] S2333, when the operating mode of the air conditioner is the heating mode, and the difference between the preset parameters is greater than the target difference threshold, it is determined that the check valve has an incompletely opened fault.

[0069] When the air conditioner operates in the cooling mode, the check valve needs to be in the closed state. Therefore, if the check valve is not closed, it is regarded as a fault. When the temperature before and after the check valve is less than the target temperature difference threshold and greater than the temperature setting value, or the pressure before and after the check valve is less than the target pressure difference threshold and greater than the pressure setting value, it indicates that the difference between the preset parameters before and after the check valve at this time is less than the normal value, but the degree is not very large. Therefore, it is determined that the check valve has a leakage fault at this time, and the corresponding fault code E1 is reported. If the temperature before and after the check valve is less than the temperature setting value, or the pressure before and after the check valve is less than the pressure setting value, it indicates that the difference between the preset parameters before and after the check valve at this time is less than the normal value, and the degree is very large. Therefore, it is determined that the check valve has a full-open and non-closable fault at this time, and the corresponding fault code E2 is reported.

[0070] When the air conditioner operates in the heating mode, the check valve needs to be in the open state. Therefore, if the check valve is not opened, it is regarded as a fault. When the temperature before and after the check valve is greater than the target temperature threshold, or the pressure before and after the check valve is greater than the target pressure threshold, it indicates that the difference between the preset parameters before and after the check valve at this time is greater than the normal value. Therefore, it is determined that the check valve has an incompletely opened fault at this time, and the corresponding fault code E4 is reported.

[0071] In this way, based on the different switch states of the check valve required when the air conditioner operates in different modes, and the magnitude of the difference between the preset parameters before and after the check valve, the specific fault of the check valve can be determined.

[0072] Combined withFigure 5 As shown, an embodiment of the present disclosure provides another method for determining a check valve failure, including:

[0073] S201, the air conditioner obtains its operating mode and preset parameters before and after the check valve.

[0074] S202, the air conditioner calculates the difference between the preset parameters before and after the check valve.

[0075] S213, the air conditioner obtains the operating frequency of the compressor.

[0076] S223, the air conditioner determines a target difference threshold according to the operating frequency.

[0077] S2333, when the operating mode of the air conditioner is the heating mode and the difference between the preset parameters is greater than the target difference threshold, it is determined that the check valve has a failure of not fully opening.

[0078] S2433, the air conditioner obtains the return air temperature of the branch corresponding to the faulty check valve.

[0079] S2533, when the return air temperature is less than the target return air temperature threshold, it is determined that there is a failure of liquid slugging and damaging the compressor.

[0080] Optionally, temperature sensors are provided at the outlets of each branch of the heat exchanger to obtain the outlet temperature of the corresponding branch. Theoretically, when the air conditioner operates in the heating mode, each branch is in parallel, so the outlet temperatures of each branch are the same. When the outlet temperature of a certain branch is different from the outlet temperatures of other branches or the difference is not within the preset range, it indicates that there is a problem with the flow rate of this branch. When it is determined that the check valve has a failure of not fully opening, the outlet temperature of each branch is obtained to assist in judging the degree of incomplete opening of the check valve. Specifically, the relationship between the operating frequency of the compressor, the difference in the outlet temperature of the branch, and the degree of incomplete opening of the check valve is stored in the processor of the air conditioner. At the same operating frequency, the greater the difference between the outlet temperature of a certain branch and the outlet temperatures of other branches, the greater the degree of incomplete opening of the faulty check valve.

[0081] Optionally, temperature sensors are provided at the return air ends of each branch to obtain the return air temperature of the corresponding branch. When the return air temperature of a certain branch is less than the return air temperature threshold, it indicates that there is a problem with the flow rate of this branch. When it is determined that the check valve has a failure of not fully opening, the return air temperature of each branch is obtained to assist in judging the degree of incomplete opening of the faulty check valve. Specifically, the relationship between the operating frequency of the compressor, the return air temperature, and the degree of incomplete opening of the check valve is stored in the processor of the air conditioner. At the same operating frequency, the greater the difference between the return air temperature of a certain branch and the return air temperature threshold, the greater the degree of incomplete opening of the faulty check valve.

[0082] Determine the target suction gas temperature threshold corresponding to the current operating frequency according to the correlation between the frequency and the suction gas temperature threshold. The greater the operating frequency, the greater the target suction gas temperature threshold. When the suction gas temperature is less than the target suction gas temperature threshold, it indicates that a large amount of liquid refrigerant may not be fully heat-exchanged and return to the compressor. Therefore, it is determined that a liquid slugging fault that damages the compressor occurs at this time, and the corresponding fault code E5 is reported.

[0083] In this way, after determining that the check valve has a fault of not fully opening, based on the outlet temperature or the suction gas temperature of the branch, it is further determined whether there may be a more serious fault, that is, whether liquid slugging will damage the compressor. Thus, potential dangers can be discovered in time to ensure the normal operation of the compressor.

[0084] Combined with Figure 6 As shown, an embodiment of the present disclosure provides a method for determining a check valve fault, including:

[0085] S201, the air conditioner obtains its operating mode and preset parameters before and after the check valve.

[0086] S202, the air conditioner calculates the difference between the preset parameters before and after the check valve.

[0087] S203, the air conditioner determines the fault condition of the check valve according to the operating mode and the difference of the preset parameters.

[0088] S204, the air conditioner executes a corresponding troubleshooting scheme according to the fault condition of the check valve.

[0089] After determining the fault condition of the check valve, according to the fault condition of the check valve, execute the corresponding and matching troubleshooting scheme.

[0090] Specifically, first determine the severity of the fault according to the fault condition. When the air conditioner is operating in the cooling mode, the check valve needs to be in the closed state. Therefore, the severity of the fault that the check valve cannot be closed when fully open is greater than the leakage fault. When the air conditioner is operating in the heating mode, the check valve needs to be in the open state, and the normal operation of the compressor is a basic requirement for the operation of the air conditioner. Therefore, the severity of the fault of liquid slugging damaging the compressor is greater than the fault of not fully opening. Then, according to the severity of the fault, execute troubleshooting schemes of different intensities. Optionally, the greater the severity of the fault, the stronger the intensity of the troubleshooting scheme executed.

[0091] Optionally, if it is determined that it is a minor fault, such as a leakage fault and an incomplete opening fault, the number of faults is determined. Each time a minor fault occurs, the number of faults is recorded as +1. When the number of faults is greater than or equal to the first preset number, when the air conditioner is turned on and operated next time, the fault troubleshooting program S1 is entered. Optionally, the first preset number is greater than or equal to 1. When performing the fault troubleshooting program S1, the compressor is controlled to operate at the first preset frequency, such as 45 Hz; the check valve is opened to the first preset opening degree, such as 480; the four-way valve is controlled to perform the following actions: open for the first preset duration, close for the second preset duration, and continuously perform M cycles. Then control the four-way valve to reverse, and again control the four-way valve to open for the first preset duration and close for the second preset duration, and continuously perform M cycles. Until the number of reversals reaches the second preset number.

[0092] If it is determined that it is a major fault, such as a full-open and unable-to-close fault and a liquid hammer damaging the compressor fault, the fault troubleshooting program S2 is directly run. When performing the fault troubleshooting program S2, the compressor is controlled to operate at the second preset frequency, such as 65 Hz; the check valve is opened to the second preset opening degree, such as 600; the four-way valve is controlled to perform the following actions: open for the third preset duration, close for the fourth preset duration, and continuously perform N cycles. Then control the four-way valve to reverse, and again control the four-way valve to open for the third preset duration and close for the fourth preset duration, and continuously perform N cycles. Until the number of reversals reaches the third preset number. Among them, the second preset frequency is greater than the first preset frequency; the second preset opening degree is greater than the first preset opening degree; the third preset duration is greater than the first preset duration; the fourth preset duration is greater than the second preset duration; N is greater than M. The third preset number is greater than the second preset number. In this way, stronger fault troubleshooting actions are performed to effectively eliminate the fault.

[0093] Optionally, the durations for controlling the four-way valve to open and close can be set according to actual needs and can be selected between 1 and 60 s, such as 10 s. By reversing the four-way valve, the refrigerant repeatedly impacts the check valve, thereby eliminating the situation where the check valve is misaligned or stuck.

[0094] Optionally, after executing the fault troubleshooting solution, restart the previously running cooling / heating mode and re-monitor the temperature difference or pressure difference before and after the check valve. After detecting the set number of times, if the temperature difference or pressure difference does not increase in the cooling mode, it is determined that the check valve has a physical jamming fault, and the corresponding fault code E3 is reported. If the temperature difference or pressure difference does not decrease in the heating mode, it is determined that the check valve has a physical jamming fault, and the corresponding fault code E3 is reported.

[0095] Optionally, a small vibration device is provided outside each one-way valve. The vibration mode can be ultrasonic vibration or mechanical vibration. When implementing the troubleshooting solution, the vibration device can be controlled to turn on to replace or assist in troubleshooting by reversing the four-way valve. When it is determined to be a minor fault, the vibration frequency of the vibration device is controlled to be the first frequency. When it is determined to be a severe fault, the vibration frequency of the vibration device is controlled to be the second frequency. The second frequency is greater than the first frequency. In this way, the vibration of the vibration device is used to reset the valve core or release the jamming.

[0096] If any one of the following conditions is met, it is determined that the fault has been eliminated:

[0097] (1) The temperature difference re-monitored in the refrigeration mode increases to above the corresponding temperature difference threshold;

[0098] (2) The pressure difference re-monitored in the refrigeration mode increases to above the corresponding pressure threshold;

[0099] (3) The outlet temperature of the branch where the one-way valve is located is the same as the outlet temperatures of other branches;

[0100] (4) The differences between the outlet temperature of the branch where the one-way valve is located and the outlet temperatures of other branches are all within the preset range;

[0101] (5) The suction gas temperature of the branch where the one-way valve is located is greater than or equal to the suction gas temperature threshold.

[0102] If, after implementing the troubleshooting solution, none of the above conditions are met, it means that the fault cannot be eliminated by the refrigerant impact of the air conditioner itself or the vibration of the vibration device, and professional staff need to carry out repairs. At this time, the corresponding fault code E3 is continuously reported to remind the relevant staff.

[0103] Combined with Figure 7 As shown, an embodiment of the present disclosure provides a device for determining a one-way valve fault, including: an acquisition module 71, a calculation module 72, and a determination module 73. The acquisition module 71 is configured to acquire the operating mode of the air conditioner and the preset parameters before and after the one-way valve. The calculation module 72 is configured to calculate the difference between the preset parameters before and after the one-way valve. The determination module 73 is configured to determine the fault condition of the one-way valve based on the operating mode and the difference of the preset parameters.

[0104] Using the device for determining a one-way valve fault provided by the embodiment of the present disclosure, the operating mode of the air conditioner and the preset parameters before and after the one-way valve are acquired, and the difference between the preset parameters before and after the one-way valve is calculated. It is judged whether the magnitude of the difference is within the normal difference range corresponding to the current operating mode, so as to determine whether the corresponding one-way valve in the variable flow splitting structure fails and the specific fault type. So as to be able to detect in time when the one-way valve fails and ensure the normal operation of the air conditioner.

[0105] Combined Figure 8 As shown, an embodiment of the present disclosure provides a device for determining a one-way valve failure, including a processor 80 and a memory 81. Optionally, the device may further include a communication interface 82 and a bus 83. Among them, the processor 80, the communication interface 82, and the memory 81 can complete mutual communication through the bus 83. The communication interface 82 can be used for information transmission. The processor 80 can call the logical instructions in the memory 81 to execute the method for determining a one-way valve failure in the above embodiment.

[0106] In addition, when the logical instructions in the above-mentioned memory 81 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0107] The memory 81, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 80 executes functional applications and data processing by running the program instructions / modules stored in the memory 81, that is, implements the method for determining a one-way valve failure in the above embodiment.

[0108] The memory 81 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 81 may include a high-speed random access memory and may also include a non-volatile memory.

[0109] An embodiment of the present disclosure provides an air conditioner including the above-mentioned device for determining a one-way valve failure.

[0110] An embodiment of the present disclosure provides a storage medium storing computer-executable instructions, and the computer-executable instructions are set to execute the above method for determining a one-way valve failure.

[0111] The above storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0112] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. Herein, what each embodiment focuses on may be the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0113] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0114] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the shown or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0115] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for determining the failure of a check valve, characterized in that, Applied to a heat exchanger, the heat exchanger includes: a first heat exchange branch, a second heat exchange branch, and a third heat exchange branch; The first main pipe is connected to the liquid collecting end of the first liquid distributor. The liquid distributing end of the first liquid distributor is connected to the first end of the first heat exchange branch. The liquid distributing end of the first liquid distributor is also connected to the liquid collecting end of the second liquid distributor through a first bypass pipeline. A first one-way valve is arranged on the first bypass pipeline, and the first one-way valve restricts the refrigerant to flow from the first liquid distributor to the second liquid distributor; The liquid distributing end of the second liquid distributor is connected to the first end of the second heat exchanger branch, and the liquid distributing end of the second liquid distributor is also connected to the first end of the third heat exchanger branch; The second end of the first heat exchange branch is connected to the liquid distributing end of the third liquid distributor, and the second end of the second heat exchange branch is connected to the liquid distributing end of the third liquid distributor of the third liquid distributor. The liquid collecting end of the third liquid distributor is connected to the liquid distributing end of the fourth liquid distributor through a second bypass pipeline. A second one-way valve is arranged on the second bypass pipeline, and the second one-way valve restricts the refrigerant to flow from the third liquid distributor to the fourth liquid distributor; The second end of the third heat exchange branch is connected to the liquid distributing end of the fourth liquid distributor, and the liquid collecting end of the fourth liquid distributor is connected to the second main pipe; When the air conditioner operates in the heating mode, each heat exchange branch is in parallel; when the air conditioner operates in the cooling mode, each heat exchange branch is in series; The method includes: Obtaining the operating mode of the air conditioner and the preset parameters before and after the one-way valve; the preset parameters are temperature or pressure; Calculating the difference between the preset parameters before and after the one-way valve; Determining the fault condition of the one-way valve according to the operating mode and the difference of the preset parameters; wherein, determining the fault condition of the one-way valve according to the operating mode and the difference of the preset parameters includes: determining the fault condition of the one-way valve according to the operating mode, the difference of the preset parameters, and the target difference threshold; Among them, determining the fault condition of the one-way valve according to the operating mode, the difference of the preset parameters, and the target difference threshold includes: in the case that the operating mode is the cooling mode, the difference of the preset parameters is less than the target difference threshold and greater than the parameter setting value, determining that the one-way valve has a leakage fault; in the case that the operating mode is the cooling mode and the difference of the preset parameters is less than the parameter setting value, determining that the one-way valve has a fully open and unable to close fault; wherein, the parameter setting value is less than the target difference threshold.

2. The method according to claim 1, characterized in that, The target difference threshold is determined by the following method: Obtaining the operating frequency of the compressor; Determining the target difference threshold according to the operating frequency.

3. The method according to claim 2, characterized in that, Determining the target difference threshold according to the operating frequency includes: Determining the target difference threshold corresponding to the current operating frequency according to the correlation between the operating frequency and the difference threshold.

4. The method according to claim 3, characterized in that, The larger the interval where the operating frequency is located, the larger the target difference threshold.

5. The method according to claim 1, characterized in that, The determining the fault condition of the one-way valve according to the operating mode, the difference of the preset parameters, and the target difference threshold further includes: In the case that the operating mode is the heating mode and the difference of the preset parameters is greater than the target difference threshold, determining that the one-way valve has an incompletely opened fault.

6. The method according to claim 5, characterized in that, The determining the fault condition of the one-way valve according to the operating mode, the difference of the preset parameters, and the target difference threshold further includes: In the case of determining that the one-way valve has an incompletely opened fault, obtaining the return air temperature of the branch corresponding to the faulty one-way valve; When the suction gas temperature is less than the target suction gas temperature threshold, it is determined that there is a liquid slugging fault that damages the compressor.

7. The method according to claim 6, characterized in that, The greater the operating frequency, the greater the target suction gas temperature threshold.

8. The method according to any one of claims 1 to 7, characterized in that, After determining the fault condition of the check valve according to the difference between the operating mode and the preset parameters, the method further includes: Executing a corresponding troubleshooting solution according to the fault condition of the check valve.

9. The method according to claim 8, characterized in that, The executing a corresponding troubleshooting solution according to the fault condition of the check valve includes: Determining the severity of the fault according to the fault condition; Executing troubleshooting solutions of different intensities according to the severity of the fault.

10. The method according to claim 9, characterized in that, Determining the severity of the fault according to the fault condition includes: If the fault condition is leakage or not fully opened, it is determined that it is a minor fault; If the fault condition is fully opened but cannot be closed or liquid slugging damages the compressor, it is determined that it is a major fault.

11. The method according to claim 9, wherein, Executing troubleshooting solutions of different intensities according to the severity of the fault includes: If it is a minor fault and the number of fault occurrences is greater than or equal to the first preset number, then when the air conditioner is turned on and operated next time, enter the fault troubleshooting program S1: Controlling the compressor at the first preset frequency and opening the check valve to the first preset opening degree Controlling the four-way valve to perform the following actions: opening for the first preset duration, closing for the second preset duration, and continuously performing M cycles; Controlling the four-way valve to reverse, and then controlling the four-way valve to open for the first preset duration and close for the second preset duration again, and continuously performing M cycles; Until the number of reversals reaches the second preset number.

12. The method according to claim 9, wherein, Executing troubleshooting solutions of different intensities according to the severity of the fault includes: If it is a major fault, then run the troubleshooting program S2: Controlling the compressor at the second preset frequency and opening the check valve to the second preset opening degree; Controlling the four-way valve to perform the following actions: opening for the third preset duration, closing for the fourth preset duration, and continuously performing N cycles; Controlling the four-way valve to reverse, and then controlling the four-way valve to open for the third preset duration and close for the fourth preset duration again, and continuously performing N cycles; Until the number of reversals reaches the third preset number.

13. The method according to claim 9, wherein, The method further includes: After executing the troubleshooting solution, restart the running cooling / heating mode and re-monitor the temperature difference or pressure difference before and after the check valve; After detecting the set number of times, if the temperature difference or pressure difference does not increase in the cooling mode, it is determined that the check valve has a physical jamming fault; if the temperature difference or pressure difference does not decrease in the heating mode, it is determined that the check valve has a physical jamming fault.

14. The method according to claim 9, wherein, The method further includes: If any of the following conditions is met, it is determined that the fault has been eliminated: (1) The temperature difference re-monitored in the cooling mode increases above the corresponding temperature difference threshold; (2) The pressure difference re-monitored in the cooling mode increases above the corresponding pressure threshold; (3) The outlet temperature of the branch where the check valve is located is the same as the outlet temperatures of other branches; (4) The differences between the outlet temperature of the branch where the check valve is located and the outlet temperatures of other branches are all within the preset range; (5) The suction gas temperature of the branch where the check valve is located is greater than or equal to the suction gas temperature threshold.

15. A device for determining a check valve failure, comprising a processor and a memory storing program instructions, wherein, The processor is configured to execute the method for determining the check valve fault according to any one of claims 1 to 14 when running the program instructions.

16. An air conditioner, wherein, Comprising a device for determining a check valve failure as described in claim 15.

17. A storage medium storing program instructions, wherein, When the program instructions are running, they execute a method for determining a check valve failure as described in any one of claims 1 to 14.

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