Method, device, air conditioner and storage medium for diagnosing faults of an air conditioner check valve

Abstract

The present application discloses a method for diagnosing faults of a one-way valve of an air conditioner. The air conditioner includes: a heat exchanger that can change the flow path of the refrigerant in the heat exchanger when the operating mode changes; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant delivery pipelines; when the air conditioner operates in the heating mode, a first one-way valve is provided on the refrigerant inlet side of each heat exchange branch, and a second one-way valve is provided on the refrigerant outlet side; the method includes: determining the operating mode of the air conditioner; according to the operating mode, determining a plurality of target pipelines among each heat exchange branch and the refrigerant delivery pipelines; and determining the fault conditions of the first one-way valve and / or the second one-way valve according to the operating parameters of each target pipeline obtained in advance. In this way, a method for determining the faults of the one-way valve in the above heat exchanger structure is proposed, so as to timely detect the fault conditions of the one-way valve and ensure the normal operation of the air conditioner. The present application also discloses a device, an air conditioner and a storage medium for diagnosing faults of a one-way valve of an air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent household appliances, and for example, relates to a method, a device, an air conditioner, and a storage medium for diagnosing a failure of a check valve of an air conditioner. Background Art

[0002] In the refrigerant circulation circuit of an air conditioner, a check valve is usually used to restrict the flow direction of the refrigerant, that is, the refrigerant can only flow in from the water inlet, and the medium at the water outlet cannot flow back. If the check valve fails, it will affect the normal operation of the air conditioner.

[0003] A method for detecting and processing a failure of a subcooling tube group of an air conditioner 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 time required for stabilization is less than a first preset time; if so, detecting the exhaust temperature in the stable state and the coil temperature of the heat exchanger of the indoor unit of the air conditioner; determining whether the difference between the exhaust temperature in the stable state and the coil temperature is less than a first preset temperature difference; and if so, determining that the check valve in the subcooling tube group fails.

[0004] In the above method, it is applicable to the subcooling tube group of the air conditioner. Currently, there is already a heat exchanger that can change the flow path of the refrigerant in the heat exchanger when the operation mode changes, that is, a heat exchanger with variable shunting ability. This heat exchanger also has a check valve. For this new type of heat exchanger, the above method for detecting check valve failure is not applicable. Summary of the Invention

[0005] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The 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 preamble to the following detailed description.

[0006] Embodiments of the present disclosure provide a method, a device, an air conditioner, and a storage medium for diagnosing a failure of a check valve of an air conditioner, so as to propose a method for determining a failure of a check valve applicable to the above heat exchanger.

[0007] In some embodiments, the air conditioner includes: a heat exchanger that can change the flow path of the refrigerant in the heat exchanger when the operation mode changes; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant delivery pipelines; when the air conditioner operates in the heating mode, a first check valve is provided on the refrigerant inlet side of each heat exchanger, and a second check valve is provided on the refrigerant outlet side; the method includes: determining the operation mode of the air conditioner; determining a plurality of target pipelines in each heat exchange branch and the refrigerant delivery pipeline according to the operation mode; and determining the failure condition of the first check valve and / or the second check valve according to the operation parameters of each target pipeline obtained in advance.

[0008] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the foregoing method for diagnosing a failure of the one-way valve of the air conditioner when the program instructions are running.

[0009] In some embodiments, the air conditioner includes: a heat exchanger capable of changing the flow path of the refrigerant in the heat exchanger when the operation mode changes; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant delivery pipelines; a first one-way valve disposed on the refrigerant inflow side of each of the heat exchange branches when the air conditioner operates in the heating mode; a second one-way valve disposed on the refrigerant outflow side of each of the heat exchange branches when the air conditioner operates in the heating mode; and the foregoing device for diagnosing a failure of the one-way valve of the air conditioner.

[0010] In some embodiments, the storage medium stores program instructions, and the program instructions execute the foregoing method for diagnosing a failure of the one-way valve of the air conditioner when running.

[0011] The method, device, air conditioner, and storage medium for diagnosing a failure of the one-way valve of the air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0012] Based on the variable flow splitting ability and its special structure of the heat exchanger, first determine a plurality of target pipelines to be monitored according to the operation mode of the air conditioner. If the one-way valve fails, the refrigerant flow rate in the target pipeline will be different from the normal situation, thus affecting the operation parameters of the target pipeline. That is to say, the operation parameters of the target pipeline can reflect the failure situation of the one-way valve from the side. Therefore, determine the failure situation of the first one-way valve and / or the second one-way valve according to the operation parameters of the target pipeline. Thus, a method for determining the failure of the one-way valve applicable to the above heat exchanger structure is proposed to timely detect the failure situation of the one-way valve and ensure the normal operation of the air conditioner.

[0013] 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

[0014] One or more embodiments are exemplarily illustrated by the corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a proportional limitation, and among them:

[0015] Figure 1 is a schematic diagram of the refrigerant circulation circuit provided by the embodiments of the present disclosure;

[0016] Figure 2 is a schematic diagram of the structure of the heat exchanger provided by the embodiments of the present disclosure;

[0017] Figure 3 It is a schematic diagram of normal refrigerant flow when the check valve spool is in place provided by an embodiment of the present disclosure;

[0018] Figure 4 It is a schematic diagram of reduced refrigerant flow when the check valve spool is stuck provided by an embodiment of the present disclosure;

[0019] Figure 5 It is a schematic diagram of no refrigerant flow when the check valve spool is in place provided by an embodiment of the present disclosure;

[0020] Figure 6 It is a schematic diagram of refrigerant leakage when the check valve spool is tilted provided by an embodiment of the present disclosure;

[0021] Figure 7 It is a schematic diagram of a method for diagnosing a check valve failure of an air conditioner provided by an embodiment of the present disclosure;

[0022] Figure 8 It is a schematic diagram of another method for diagnosing a check valve failure of an air conditioner provided by an embodiment of the present disclosure;

[0023] Figure 9 It is a schematic diagram of another method for diagnosing a check valve failure of an air conditioner provided by an embodiment of the present disclosure;

[0024] Figure 10 It is a schematic diagram of another method for diagnosing a check valve failure of an air conditioner provided by an embodiment of the present disclosure;

[0025] Figure 11 It is a schematic diagram of a device for diagnosing a check valve failure of an air conditioner provided by an embodiment of the present disclosure;

[0026] Figure 12 It is a schematic diagram of another device for diagnosing a check valve failure of an air conditioner provided by an embodiment of the present disclosure.

[0027] Reference numerals:

[0028] 10. Compressor; 20. Indoor heat exchanger; 30. Outdoor heat exchanger; 31. First liquid distributor; 32. Second liquid distributor; 33. Third liquid distributor; 34. Fourth liquid distributor; 35. First heat exchange branch; 36. Second heat exchange branch; 37. Third heat exchange branch; 38. First bypass pipeline; 381. First check valve; 39. Second bypass pipeline; 391. Second check valve; 40. Throttling device; 50. First main pipe; 60. Second main pipe; 70. First sensor; 80. Second sensor; 90. Third sensor; 100. Fourth sensor; 110. Housing; 120. Spool; 130. Limiting member; 140. Valve seat. Detailed implementation manners

[0029] In order to more comprehensively understand the features and technical content of the embodiments of the present disclosure, 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 for reference and illustration purposes only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0030] In the description of 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 "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0031] Unless otherwise specified, the term "plurality" means two or more.

[0032] 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.

[0033] The term "and / or" is a description of the associated relationship of objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0034] The term "corresponding" may refer to an associated relationship or a binding relationship. A corresponding to B means that there is an associated relationship or a binding relationship between A and B.

[0035] As shown in Figure 1 the embodiments of the present disclosure provide an air conditioner. The air conditioner includes: a compressor 10, an indoor heat exchanger 20, an outdoor heat exchanger 30, and a throttling device 40. The compressor 10, the indoor heat exchanger 20, the outdoor variable flow-dividing heat exchanger 30, and the throttling device 40 are connected to form a refrigerant circulation loop.

[0036] As shown in Figure 2 the outdoor heat exchanger 30 includes: a first liquid distributor 31, a second liquid distributor 32, a third liquid distributor 33, a fourth liquid distributor 34, a heat exchange pipeline, and a refrigerant delivery pipeline.

[0037] The heat exchange pipeline includes: a first heat exchange branch 35, a second heat exchange branch 36, and a third heat exchange branch 37. The first heat exchange branch 35 is the lowermost heat exchange branch. The second heat exchange branch 36 is the middle heat exchange branch. The third heat exchange branch 37 is the uppermost heat exchange branch.

[0038] The refrigerant delivery pipeline includes: a first main pipe 50, a second main pipe 60, a first bypass pipeline 38, and a second bypass pipeline 39.

[0039] The liquid collection end of the first liquid distributor 31 is connected to the indoor heat exchanger 20 through the first main pipe 50.

[0040] The liquid distribution end of the first liquid distributor 31 is connected to the first end of the first heat exchange branch 35. The liquid distribution end of the first liquid distributor 31 is also connected to the liquid collection end of the second liquid distributor 32 through the first bypass pipeline 38. A first one-way valve 381 is provided on the first bypass pipeline 38 to limit the refrigerant in the first bypass pipeline 38 to flow only from the first liquid distributor 31 to the second liquid distributor 32.

[0041] The liquid distribution end of the second liquid distributor 32 is connected to the first end of the second heat exchange branch 36. The liquid distribution end of the second liquid distributor 32 is also connected to the first end of the third heat exchange branch 37.

[0042] The second end of the first heat exchange branch 35 is connected to the liquid distribution end of the third liquid distributor 33. The second end of the second heat exchange branch 36 is connected to the liquid distribution end of the third liquid distributor 33. The liquid collection end of the third liquid distributor 33 is connected to the liquid distribution end of the fourth liquid distributor 34 through the second bypass pipeline 39. A second one-way valve 391 is provided on the second bypass pipeline 39 to limit the refrigerant in the second bypass pipeline 39 to flow only from the third liquid distributor 33 to the fourth liquid distributor 34.

[0043] The second end of the third heat exchange branch 37 is connected to the liquid distribution end of the fourth liquid distributor 34. The liquid collection end of the fourth liquid distributor 34 is connected to the throttling device 40 through the second main pipe 60.

[0044] When the air conditioner operates in the heating mode, the refrigerant flows in from the first main pipe 50. Under the liquid distribution action of the first liquid distributor 31 and the second liquid distributor 32, it flows into the first heat exchange branch 35, the second heat exchange branch 36, and the third heat exchange branch 37 respectively. Then it converges in the second main pipe 60 and flows into the throttling device 40. In this way, each heat exchange branch is in parallel.

[0045] When the air conditioner operates in the cooling mode, the refrigerant flows in from the second main pipe 60. Under the blocking action of the first one-way valve 381 and the second one-way valve 391, it flows into the third heat exchange branch 37, the second heat exchange branch 36, and the first heat exchange branch 35 in sequence. Finally, it flows into the indoor heat exchanger 20 through the first main pipe 50. In this way, each heat exchange branch is in series.

[0046] It should be noted that the heat exchange pipeline can include more heat exchange branches and liquid distributors. The specific connection method can refer to the previous text to achieve more heat exchange branches in parallel in the heating mode and more heat exchange branches in series in the cooling mode.

[0047] If the air conditioner operates in the heating mode, the refrigerant inflow side of the outdoor heat exchanger is Figure 1 the right side of the outdoor heat exchanger in Figure 1 and the refrigerant outflow side is the left side of the outdoor heat exchanger in Figure 1 If the air conditioner operates in the cooling mode, the refrigerant inflow side of the outdoor heat exchanger is Figure 1 the left side of the outdoor heat exchanger in

[0048] and the refrigerant outflow side is the right side of the outdoor heat exchanger in

[0049] The one-way valve includes: a housing 110, a valve core 120, a limiting member 130, and a valve seat 140. When the fluid flows forward, under the impact of the fluid, the valve core 120 moves inside the housing 110 to the limiting position. The fluid flows out along the gap between the valve core 120 and the housing 110 and the limiting member 130. At this time, the one-way valve is in the conducting state. When the fluid flows backward, under the impact of the fluid, the valve core 120 moves inside the housing 110 to the position of the valve seat 140. The valve core 120 is in complete contact with the valve seat 140 without a gap, and the fluid cannot flow out. At this time, the one-way valve is in the closed state.

[0050] When the valve core 120 of the one-way valve is affected by the fluid, the following faults are likely to occur:

[0051] ① As shown in Figure 3 and Figure 4 , if the cooling mode is operating, when the valve core 120 moves towards the limiting member 130 (forward movement), it is easily affected by the fluid flow pulsation. The valve core 120 rotates and displaces inside the cavity and gets stuck in the limiting member 130, which will cause a reduction in the refrigerant flow rate;

[0052] ② As shown in Figure 5 and Figure 6 , if the heating mode is operating, when the valve core 120 moves towards the valve seat 140 (reverse movement), since the valve core 120 is impacted by the fluid and cannot fully cooperate with the valve seat 140 surface, refrigerant leakage will occur.

[0053] Therefore, it is very necessary to determine the fault condition of the one-way valve in a timely manner.

[0054] As shown in Figure 7 , the embodiment of the present disclosure provides a method for diagnosing the fault of the one-way valve of an air conditioner, including:

[0055] S701, the processor determines the operating mode of the air conditioner.

[0056] S702. The processor determines a plurality of target pipelines in each heat exchange branch and the refrigerant delivery pipeline according to the operating mode.

[0057] S703. The processor determines the fault condition of the first check valve and / or the second check valve according to the operation parameters of each target pipeline obtained in advance.

[0058] When the air conditioner is operating, determine the operating mode of the air conditioner, for example, determine whether the air conditioner is operating in the cooling mode or the heating mode. Specifically, when the air conditioner processor receives an instruction, it will parse the instruction to obtain relevant control content. The processor can determine the current operating mode based on the content obtained from previous parsing. According to the operating mode of the air conditioner, a plurality of target pipelines are determined from each heat exchange branch and the refrigerant delivery pipeline. During the operation of the air conditioner, the operation parameters of the target pipelines are obtained in real time through the sensors provided on each target pipeline.

[0059] Optionally, the operation parameter of the target pipeline can be the pipeline pressure or the pipeline temperature. This is because: if the check valve fails, the temperature and pressure of the pipeline will change. Therefore, the pipeline pressure or the pipeline temperature can reflect whether the check valve fails from the side. If the operation parameter is the pipeline pressure, the sensor provided on the target pipeline is a pressure sensor. If the operation parameter is the pipeline temperature, the sensor provided on the target pipeline is a temperature sensor.

[0060] Determine the fault condition of the first check valve and / or the second check valve according to the operation parameters of the target pipeline obtained in real time. Specifically, it can be determined which check valve fails and the type of the fault.

[0061] In the embodiment of the present disclosure, based on the heat exchanger having variable flow splitting ability and its special structure, first determine a plurality of target pipelines to be monitored according to the operating mode of the air conditioner. If the check valve fails, the refrigerant flow rate in the target pipeline will be different from the normal situation, thus affecting the operation parameters of the target pipeline. That is to say, the operation parameters of the target pipeline can reflect the fault condition of the check valve from the side. Therefore, determine the fault condition of the first check valve and / or the second check valve according to the operation parameters of the target pipeline. Thus, a method for determining the fault of the check valve applicable to the above heat exchanger structure is proposed to timely detect the fault condition of the check valve and ensure the normal operation of the air conditioner.

[0062] Combined with Figure 8 As shown in, the embodiment of the present disclosure provides another method for diagnosing the fault of the air conditioner check valve, including:

[0063] S701. The processor determines the operating mode of the air conditioner.

[0064] S712. When the operating mode of the processor is the cooling mode, the first main pipe, the second main pipe, and the lowermost heat exchange branch are determined as the target pipelines.

[0065] S722. When the operating mode of the processor is the heating mode, the first main pipe, the second main pipe, the lowermost heat exchange branch, and the uppermost heat exchange branch are determined as the target pipelines.

[0066] S703. The processor determines the fault conditions of the first check valve and / or the second check valve according to the operation parameters of each target pipeline obtained in advance.

[0067] Since the flow direction of the refrigerant is different when the air conditioner operates in different modes, the function (conducting or blocking) of the check valve will also be different accordingly. Therefore, different operating modes will affect the operation parameters of different pipelines. So, it is necessary to determine the target pipelines based on the operating mode.

[0068] When the operating mode is the cooling mode, the check valve needs to block the refrigerant. Taking the second check valve as an example, if the second check valve has a leakage fault, a part of the refrigerant will flow directly into the lowermost heat exchange branch without passing through the heat exchanger. This will affect the operation parameters of the lowermost heat exchange branch. Similarly, if the first check valve has a leakage fault, it will affect the operation parameters of the first main pipe. In this case, the difference between the operation parameters of the second main pipe and the lowermost heat exchange branch, and the difference between the operation parameters of the second main pipe and the first main pipe will be different from the normal difference. Therefore, if the operating mode is the cooling mode, the first main pipe, the second main pipe, and the lowermost heat exchange branch are determined as the target pipelines. Optionally, the sensor (the second sensor) on the lowermost heat exchange branch is set in the unheated part (relative to the cooling mode). This is because: if it is set in the part that has passed through the heat exchanger, the detected operation parameter is the operation parameter after heat exchange, and it is impossible to accurately judge whether the second check valve has a fault.

[0069] When the operation mode is the heating mode, the one-way valve needs to conduct the refrigerant. Taking the first one-way valve as an example, if the first one-way valve has a blockage fault, more refrigerant will enter the lowermost heat exchange branch, and at the same time, less refrigerant will enter other heat exchange branches. This will affect the operating parameters of each heat exchange branch. There are one-way valves arranged before and after the middle heat exchange branch, and it is difficult to determine which one-way valve has a fault based on the operating parameters of the middle heat exchange branch. There is only one one-way valve in the flow path of the refrigerant in the lowermost heat exchange branch and the uppermost heat exchange branch, and it is relatively easy to determine the position of the one-way valve with a fault. In this case, the differences between the operating parameters of the first main pipe and the uppermost heat exchange branch, the differences between the operating parameters of the first main pipe and the second main pipe, and the differences between the operating parameters of the first main pipe and the lowermost heat exchange branch will all be different from the differences in the normal situation. Therefore, if the operation mode is the heating mode, the first main pipe, the second main pipe, the lowermost heat exchange branch, and the uppermost heat exchange branch are determined as the target pipelines. Optionally, the sensor on the uppermost heat exchange branch is arranged in the part that has undergone heat exchange (relative to the heating mode). This is because: if it is arranged in the part that has not passed through the heat exchanger, the detected operating parameter is the operating parameter after not passing through the heat exchanger, and it is impossible to accurately determine whether the one-way valve has a fault.

[0070] In this way, based on the operation mode of the air conditioner and combined with the function of the one-way valve, in each heat exchange branch and the refrigerant delivery pipeline, a suitable pipeline is selected as the target pipeline to be monitored, so as to accurately determine the one-way valve with a fault.

[0071] Combined with Figure 9 , the embodiments of the present disclosure provide another method for diagnosing the fault of the one-way valve of an air conditioner, including:

[0072] S701, the processor determines the operation mode of the air conditioner.

[0073] S702, the processor determines a plurality of target pipelines in each heat exchange branch and the refrigerant delivery pipeline according to the operation mode.

[0074] S713, the processor determines multiple groups of comparison pipelines among the target pipelines.

[0075] S723, the processor calculates the differences between the operating parameters of the comparison pipelines in the same group.

[0076] S733, the processor determines the fault conditions of the first one-way valve and / or the second one-way valve according to the calculated multiple differences.

[0077] Among multiple target pipelines, multiple groups of comparison pipelines are determined with two target pipelines in each group. The difference in the operating parameters of the two target pipelines in the same group is calculated, and the difference is used to determine the fault condition of the first check valve and / or the second check valve. For example, when the second check valve has a leakage fault, part of the refrigerant will flow directly into the lowermost heat exchange branch without passing through the heat exchanger. Then the operating parameters (temperature or pressure) of the lowermost heat exchange branch will be on the low side. Therefore, the difference in the operating parameters of the pipelines before and after the second check valve, that is, the difference in the operating parameters of the second main pipeline and the lowermost heat exchange branch, can be used to determine whether the second check valve has a fault.

[0078] Optionally, in step S713, the processor determines multiple groups of comparison pipelines in the target pipelines, including:

[0079] When the operating mode is the refrigeration mode, the processor determines the second main pipeline and the lowermost heat exchange branch as the first group of comparison pipelines, and the second main pipeline and the first main pipeline as the second group of comparison pipelines.

[0080] When the operating mode is the heating mode, the processor determines the first main pipeline and the uppermost heat exchange branch as the third group of comparison pipelines, the first main pipeline and the second main pipeline as the fourth group of comparison pipelines, and the first main pipeline and the lowermost heat exchange branch as the fifth group of comparison pipelines.

[0081] When the operating mode is the refrigeration mode, if the second check valve has a leakage fault, part of the refrigerant flowing out of the second main pipeline will flow directly into the lowermost heat exchange branch without heat exchange and then flow into the first main pipeline. If the first check valve has a leakage fault, part of the refrigerant will directly enter the first main pipeline through the first check valve and the first liquid distributor, and the refrigerant flowing into the lowermost heat exchange branch will decrease. In the above two cases, the difference in the operating parameters between the second main pipeline and the lowermost heat exchange branch, and the difference in the operating parameters between the second main pipeline and the first main pipeline will be different from the normal situation. Therefore, the second main pipeline and the lowermost heat exchange branch are determined as the first group of comparison pipelines, and the second main pipeline and the first main pipeline are determined as the second group of comparison pipelines. The fault condition of the first check valve and / or the second check valve is determined by the difference in the operating parameters of the first group of comparison pipelines and the difference in the operating parameters of the second group of comparison pipelines.

[0082] When the operating mode is the heating mode, if the second one-way valve fails, the refrigerant flow rate in the uppermost heat exchange branch will increase, and the operating parameters of the uppermost heat exchange branch and the first main pipe will be on the low side. Therefore, it is determined that the first main pipe and the uppermost heat exchange branch are the third group of comparison pipelines, and the first main pipe and the second main pipe are the fourth group of comparison pipelines. The fault condition of the second one-way valve is determined by the difference in the operating parameters of the third group of comparison pipelines and the difference in the operating parameters of the fourth group of comparison pipelines. If the first one-way valve is blocked, the refrigerant flow rate in the uppermost heat exchange branch will decrease, and the refrigerant flow rate in the uppermost heat exchange branch will increase. Then the operating parameters of the uppermost heat exchange branch will be on the high side, and the operating parameters of the lowermost heat exchange branch will be on the low side. Therefore, it is determined that the first main pipe and the lowermost heat exchange branch are the fifth group of comparison pipelines. The fault condition of the first one-way valve is determined by the difference in the operating parameters of the third group of comparison pipelines and the difference in the operating parameters of the fifth group of comparison pipelines.

[0083] Optionally, in step S733, the processor determines the fault condition of the first one-way valve and / or the second one-way valve according to the calculated multiple differences, including:

[0084] When the difference in the operating parameters of the first group of comparison pipelines and the difference in the operating parameters of the second group of comparison pipelines meet the first preset difference condition, the processor determines that the first one-way valve has a leakage fault.

[0085] When the difference in the operating parameters of the first group of comparison pipelines and the difference in the operating parameters of the second group of comparison pipelines meet the second preset difference condition, the processor determines that the second one-way valve has a leakage fault.

[0086] When the difference in the operating parameters of the third group of comparison pipelines and the difference in the operating parameters of the fourth group of comparison pipelines meet the third preset difference condition, the processor determines that the first one-way valve is blocked.

[0087] When the difference in the operating parameters of the third group of comparison pipelines and the difference in the operating parameters of the fifth group of comparison pipelines meet the fourth preset difference condition, the processor determines that the second one-way valve is blocked.

[0088] The operating parameter Sa of the second main pipe, the operating parameter Sb of the lowermost heat exchange branch, the operating parameter Sc of the first main pipe, and the operating parameter Sd of the uppermost heat exchange branch are obtained in real time through the sensors arranged on each target pipeline.

[0089] The first preset difference condition is: Sa - Sb ≤ A, and Sa - Sc ≤ B. Wherein, A is the first parameter threshold, and B is the second parameter threshold.

[0090] The second preset difference condition is: Sa - Sb ≥ C, and Sa - Sc ≤ D. Wherein, C is the third parameter threshold, and D is the fourth parameter threshold.

[0091] The third preset difference condition is: Sc - Sd ≤ E, and Sc - Sa ≤ F. Here, E is the fifth parameter threshold, and F is the sixth parameter threshold.

[0092] The fourth preset difference condition is: Sc - Sb ≤ G, and Sc - Sd ≥ H. Here, G is the seventh parameter threshold, and H is the eighth parameter threshold.

[0093] If the first preset difference condition is satisfied, it is determined that the first check valve has a leakage fault. If the second preset difference condition is satisfied, it is determined that the second check valve has a leakage fault. If the third preset difference condition is satisfied, it is determined that the first check valve has a blockage fault. If the fourth preset difference condition is satisfied, it is determined that the second check valve has a blockage fault.

[0094] According to the operating frequency of the compressor, determine the specific values of the first parameter threshold A, the second parameter threshold B, the third parameter threshold C, the fourth parameter threshold D, the fifth parameter threshold E, the sixth parameter threshold F, the seventh parameter threshold G, and the eighth parameter threshold H. The association relationship between the operating frequency of the compressor and the parameter thresholds is pre - stored in the processor of the air conditioner. This association relationship contains one or more corresponding relationships between the operating frequencies and the parameter thresholds.

[0095] Next, taking the pipeline temperature as the operating parameter as an example, the method for determining the association relationship between the operating frequency and the parameter thresholds will be specifically introduced:

[0096] 1. When the air conditioner operates in the cooling mode, replace the second check valve with a leaking check valve. Control the compressor to operate at the lowest frequency M1 within its operating range. Record the temperatures Ta1, Tb1, and Tc1 detected by the first sensor, the second sensor, and the third sensor. Since the second check valve leaks and part of the refrigerant enters the third liquid distributor directly without heat exchange through the heat exchanger, Tb1 and Tc1 are relatively low. Calculate Ta1 - Tb1 = A1 and Ta1 - Tc1 = B1, and record the values of A1 and B1. Adjust the operating frequency of the compressor to M2, repeat the above steps, and record the values of A2 and B2. Increase the compressor frequency to the highest operating frequency Mn within the operating range at regular frequency intervals, repeat the above steps, and record the values as shown in Table 1.

[0097] Table 1 Association relationship between the operating frequency of the compressor and the first temperature threshold and the second temperature threshold

[0098] Compressor frequency Ta Tb Tc A B M1 Ta1 Tb1 Tc1 A1 B1 M2 Ta2 Tb2 Tc2 A2 B2 M3 Ta3 Tb3 Tc3 A3 B3 … … … … … … Mn - 1 Ta(n - 1) Tb(n - 1) Tc(n - 1) A(n - 1) B(n - 1) Mn Tan Tbn Tcn An Bn

[0099] 2. When the air conditioner operates in the cooling mode, replace the first one-way valve with a leaky one-way valve. At this time, part of the refrigerant directly enters the first liquid distributor without passing through the first one-way valve. The refrigerant flowing through the third liquid distributor decreases, resulting in a relatively high Tb and a relatively low Tc. Control the compressor frequency to run from M1 to Mn at regular frequency intervals, and record n groups of Ta, Tb, and Tc. Calculate Ta - Tb = C and Ta - Tc = D, as shown in Table 2.

[0100] Table 2 Association relationship between the compressor operating frequency and the third temperature threshold and the fourth temperature threshold

[0101] Compressor frequency Ta Tb Tc C D M1 Ta1 Tb1 Tc1 C1 D1 M2 Ta2 Tb2 Tc2 C2 D2 M3 Ta3 Tb3 Tc3 C3 D3 … … … … … … Mn - 1 Ta(n - 1) Tb(n - 1) Tc(n - 1) C(n - 1) D(n - 1) Mn Tan Tbn Tcn Cn Dn

[0102] 3. When the air conditioner operates in the heating condition, replace the second one-way valve with a blocked one-way valve. At this time, the refrigerant flow rate through the third heat exchange branch increases. Therefore, the temperature Td recorded by the fourth sensor is relatively low, and the temperature Ta recorded by the first sensor is relatively low. Control the compressor to operate at different frequencies in the above manner. Record the temperatures Ta, Tc, and Td detected by the first sensor, the third sensor, and the fourth sensor corresponding to different frequencies. Calculate Tc - Td = E and Tc - Ta = F. Obtain the association relationship between the compressor operating frequency and the fifth temperature threshold E and the sixth temperature threshold F.

[0103] 4. When the air conditioner operates in the heating condition, replace the first one-way valve with a blocked one-way valve. At this time, the refrigerant flow rate through the third heat exchange branch decreases, and the refrigerant flow rate through the first heat exchange branch increases. Therefore, the temperature Td detected by the fourth sensor is relatively high, and the temperature Tb detected by the second sensor is relatively low. Control the compressor to operate at different frequencies in the above manner. Record the temperatures Ta, Tb, and Td detected by the first sensor, the second sensor, and the fourth sensor corresponding to different frequencies. Calculate Tc - Tb = G and Tc - Td = H. Obtain the association relationship between the compressor operating frequency and the seventh temperature threshold G and the eighth temperature threshold H.

[0104] If the operating parameter is the pipeline pressure, the method for determining the association relationship between the compressor operating frequency and each pressure threshold is the same as the above method, which will not be elaborated here.

[0105] Store the above obtained association relationships in the air conditioner processor. In this way, when the air conditioner operates, the corresponding parameter thresholds can be obtained according to the operating mode of the air conditioner and the operating frequency of the compressor. If the operating frequency of the compressor is between two frequencies in the table, the interpolation method is used to calculate the values of A, B, C, D, E, F, G, and H.

[0106] Combined Figure 10 As shown, another method for diagnosing the one-way valve failure of the air conditioner provided by the embodiment of the present disclosure includes:

[0107] S701, the processor determines the operating mode of the air conditioner.

[0108] S702, the processor determines a plurality of target pipelines in each of the heat exchange branches and the refrigerant delivery pipeline according to the operating mode.

[0109] S703, the processor determines the fault condition of the first check valve and / or the second check valve according to the operating parameters of each target pipeline obtained in advance.

[0110] S704, the processor switches the operating mode of the air conditioner a preset number of times to eliminate the fault.

[0111] S705, the processor re-determines the fault condition of the first check valve and the second check valve.

[0112] S706, when the first check valve and / or the second check valve still has a fault, the processor sends an alarm prompt.

[0113] After determining that the first check valve and / or the second check valve has a fault, an alarm prompt is sent to the remote cloud to remind the engineer to handle the fault of the check valve. Alternatively, the operating mode is automatically switched, that is, the air conditioner is controlled to switch between the heating mode and the cooling mode. Due to the change of the operating mode, the flow direction of the refrigerant in the heat exchanger also changes. In this way, the impact of the refrigerant on the valve core is utilized to make the valve core of the check valve fit with the limiting component again. Switch like this for a preset number of times, for example, switch 3 to 4 times. Then, according to the method described above, re-determine the fault condition of the first check valve and the second check valve. If the first check valve and / or the second check valve still has a fault, it may be that the valve core is worn and needs to be replaced. In this case, the air conditioner sends an alarm prompt to remind the user or the engineer to replace the valve core in time. Optionally, there are various ways for the air conditioner to send an alarm prompt. For example, the air conditioner can send a voice alarm prompt through its own voice module to remind the user; it can also communicate with a terminal device (such as a mobile phone, a computer, etc.) through its own communication module and send an alarm prompt to the terminal device to remind the user; it can also send an alarm prompt to the remote cloud to remind the engineer to handle it.

[0114] Combined Figure 11 As shown in the figure, an embodiment of the present disclosure provides a device for diagnosing the fault of a check valve of an air conditioner, including: a first determination module 111, a second determination module 112, and a third determination module 113. The first determination module 111 is configured to determine the operating mode of the air conditioner. The second determination module 111 is configured to determine a plurality of target pipelines in each of the heat exchange branches and the refrigerant delivery pipeline according to the operating mode. The third determination module 111 is configured to determine the fault condition of the first check valve and / or the second check valve according to the operating parameters of each target pipeline obtained in advance.

[0115] Combined Figure 12 As shown, an embodiment of the present disclosure provides a device for diagnosing faults of an air conditioner check valve, including a processor 120 and a memory 121. Optionally, the device may further include a communication interface 122 and a bus 123. Among them, the processor 120, the communication interface 122, and the memory 121 can complete mutual communication through the bus 123. The communication interface 122 can be used for information transmission. The processor 120 can call the logical instructions in the memory 121 to execute the method for diagnosing faults of the air conditioner check valve in the above embodiment.

[0116] In addition, when the logical instructions in the above-mentioned memory 121 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.

[0117] The memory 121, 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 120 executes functional applications and data processing by running the program instructions / modules stored in the memory 121, that is, implements the method for diagnosing faults of the air conditioner check valve in the above embodiment.

[0118] The memory 121 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 121 may include a high-speed random access memory and may also include a non-volatile memory.

[0119] An embodiment of the present disclosure provides an air conditioner including the above-mentioned device for diagnosing faults of an air conditioner check valve.

[0120] 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 diagnosing faults of an air conditioner check valve.

[0121] The above storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0122] 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. The embodiments only represent possible variations. Unless explicitly required, the 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 the embodiments and do not limit the claims. As used in the description of the embodiments and the 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 including 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 an..." 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.

[0123] 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 technician can 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 technician 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.

[0124] In the embodiments disclosed in this document, 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 displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections 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.

[0125] 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 the 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 blocks 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 diagnosing faults in a one-way valve of an air conditioner, the air conditioner comprising: Heat exchanger, characterized in that the heat exchanger comprises: a first heat exchange branch, a second heat exchange branch and a third heat exchange branch; the first heat exchange branch is the lowermost heat exchange branch, and the third heat exchange branch is the uppermost heat exchange branch; the refrigerant delivery pipeline comprises a first main pipe and a second main pipe; The first main pipe is communicated with the liquid collecting end of the first liquid distributor, the liquid distributing end of the first liquid distributor is communicated with the first end of the first heat exchange branch, and the liquid distributing end of the first liquid distributor is also communicated with 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 communicated with the first end of the second heat exchanger branch, and the liquid distributing end of the second liquid distributor is also communicated with the first end of the third heat exchanger branch; The second end of the first heat exchange branch is communicated with the liquid distributing end of the third liquid distributor, and the second end of the second heat exchange branch is communicated with the liquid distributing end of the third liquid distributor of the third liquid distributor; the liquid collecting end of the third liquid distributor is communicated with 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 communicated with the liquid distributing end of the fourth liquid distributor, and the liquid collecting end of the fourth liquid distributor is communicated with 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: Determine the operating mode of the air conditioner; According to the operating mode, determine a plurality of target pipelines in each of the heat exchange branches and the refrigerant delivery pipeline; including: in the case where the operating mode is the cooling mode, determining the first main pipe, the second main pipe and the lowermost heat exchange branch as target pipelines; in the case where the operating mode is the heating mode, determining the first main pipe, the second main pipe, the lowermost heat exchange branch and the uppermost heat exchange branch as target pipelines; According to the operating parameters of each target pipeline obtained in advance, determine the fault conditions of the first one-way valve and / or the second one-way valve; the operating parameters are pipeline pressure or pipeline temperature; including: in the target pipeline, determine multiple groups of comparison pipelines; calculate the difference between the operating parameters of the comparison pipelines in the same group; according to the calculated multiple differences, determine the fault conditions of the first one-way valve and / or the second one-way valve; Wherein, determining multiple groups of comparison pipelines in the target pipeline includes: in the case where the operating mode is the cooling mode, determining the second main pipe and the lowermost heat exchange branch as the first group of comparison pipelines, and the second main pipe and the first main pipe as the second group of comparison pipelines; in the case where the operating mode is the heating mode, determining the first main pipe and the uppermost heat exchange branch as the third group of comparison pipelines, the first main pipe and the second main pipe as the fourth group of comparison pipelines, and the first main pipe and the lowermost heat exchange branch as the fifth group of comparison pipelines.

2. The method according to claim 1, wherein, Use sensors to obtain the operating parameters of the target pipelines; wherein, the sensor of the lowermost heat exchange branch is arranged on the unheated part of the lowermost heat exchange branch when operating in the cooling mode.

3. The method according to claim 1, wherein, Obtain the operating parameters of the target pipeline using sensors; among them, the sensor of the uppermost heat exchange branch is arranged on the heat-exchanged part of the uppermost heat exchange branch when the heating mode is running.

4. The method according to claim 1, wherein, Determine the fault conditions of the first one-way valve and / or the second one-way valve according to the calculated multiple differences, including: When the difference in the operating parameters of the first group of comparison pipelines and the difference in the operating parameters of the second group of comparison pipelines meet the first preset difference condition, it is determined that the first one-way valve has a leakage fault; When the difference in the operating parameters of the first group of comparison pipelines and the difference in the operating parameters of the second group of comparison pipelines meet the second preset difference condition, it is determined that the second one-way valve has a leakage fault; When the difference in the operating parameters of the third group of comparison pipelines and the difference in the operating parameters of the fourth group of comparison pipelines meet the third preset difference condition, it is determined that the first one-way valve has a blockage fault; When the difference in the operating parameters of the third group of comparison pipelines and the difference in the operating parameters of the fifth group of comparison pipelines meet the fourth preset difference condition, it is determined that the second one-way valve has a blockage fault.

5. The method according to claim 4, wherein, The first preset difference condition is: Sa - Sb ≤ A, and Sa - Sc ≤ B; where Sa is the operating parameter of the second main pipe, Sb is the operating parameter of the lowermost heat exchange branch, Sc is the operating parameter of the first main pipe, A is the first parameter threshold, and B is the second parameter threshold.

6. The method according to claim 4, wherein, The second preset difference condition is: Sa - Sb ≥ C, and Sa - Sc ≤ D; where Sa is the operating parameter of the second main pipe, Sb is the operating parameter of the lowermost heat exchange branch, Sc is the operating parameter of the first main pipe, C is the third parameter threshold, and D is the fourth parameter threshold.

7. The method according to claim 4, wherein, The third preset difference condition is: Sc - Sd ≤ E, and Sc - Sa ≤ F; where Sa is the operating parameter of the second main pipe, Sd is the operating parameter of the uppermost heat exchange branch, Sc is the operating parameter of the first main pipe, E is the fifth parameter threshold, and F is the sixth parameter threshold.

8. The method according to claim 4, wherein, The fourth preset difference condition is: Sc - Sb ≤ G, and Sc - Sd ≥ H; where Sa is the operating parameter of the second main pipe, Sd is the operating parameter of the uppermost heat exchange branch, Sc is the operating parameter of the first main pipe, G is the seventh parameter threshold, and H is the eighth parameter threshold.

9. The method according to any one of claims 5 to 8, wherein, Determine the parameter threshold according to the operating frequency of the compressor.

10. The method according to any one of claims 1 to 8, wherein, After determining the fault conditions of the first one-way valve and / or the second one-way valve, the method further includes: Switch the operating mode of the air conditioner a preset number of times to eliminate the fault.

11. The method according to claim 10, wherein,After switching the operating mode of the air conditioner a preset number of times, the method further includes: Redetermine the fault conditions of the first one-way valve and the second one-way valve; When the first one-way valve and / or the second one-way valve still has a fault, send an alarm prompt.

12. An apparatus for diagnosing faults of a one-way valve of an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the method for diagnosing the fault of the one-way valve of the air conditioner according to any one of claims 1 to 11 when running the program instructions.

13. An air conditioner, comprising: A heat exchanger, characterized in that it includes: The first heat exchange branch, the second heat exchange branch, and the third heat exchange branch; the first heat exchange branch is the lowermost heat exchange branch, and the third heat exchange branch is the uppermost heat exchange branch; the refrigerant delivery pipeline includes a first main pipe and a second main pipe; 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, and 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 provided 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 provided 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 connected in parallel; when the air conditioner operates in the cooling mode, each heat exchange branch is connected in series; The device for the method for diagnosing the failure of the one-way valve of the air conditioner according to claim 12.

14. A storage medium storing program instructions, characterized in that, When the program instructions are running, they execute the method for diagnosing the failure of the one-way valve of the air conditioner according to any one of claims 1 to 11.

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