CN115264753A

CN115264753A - Method and device for diagnosing fault of air conditioner one-way valve, air conditioner and storage medium

Info

Publication number: CN115264753A
Application number: CN202210893801.XA
Authority: CN
Inventors: 丁爽; 王飞; 崔文娟; 蒋骏; 王麒澄
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-11-01
Also published as: WO2024021430A1

Abstract

The application discloses a method for diagnosing air conditioner check valve trouble, the air conditioner includes: the heat exchanger can change the circulation path of the refrigerant in the heat exchanger under the condition that the operation mode is changed; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant conveying pipelines; under the condition of the air conditioner running heating mode, a first one-way valve is arranged on the refrigerant inflow side of each heat exchanger, and a second one-way valve is arranged on the refrigerant outflow side of each heat exchanger; the method comprises the following steps: determining an operation mode of an air conditioner; determining a plurality of target pipelines in each heat exchange branch and refrigerant conveying pipeline according to an operation mode; and determining the fault condition of the first check valve and/or the second check valve according to the operation parameters of each target pipeline acquired in advance. Therefore, the method for determining the fault of the one-way valve in the heat exchanger structure is provided, so that the fault condition of the one-way valve can be found in time, and the normal operation of the air conditioner is ensured. The application also discloses a device, an air conditioner and a storage medium for diagnosing the fault of the air conditioner check valve.

Description

Method and device for diagnosing fault of air conditioner one-way valve, air conditioner and storage medium

Technical Field

The application relates to the technical field of intelligent household appliances, in particular to a method and a device for diagnosing a fault of a check valve of an air conditioner, the air conditioner and a storage medium.

Background

In a refrigerant circulation loop of an air conditioner, a check valve is usually used to limit the flow direction of the refrigerant, i.e., the refrigerant can only flow in along a water inlet, but the medium at a water outlet cannot flow back. If the one-way valve fails, the normal operation of the air conditioner is affected.

The related art discloses a fault detection and processing method for an air conditioner supercooling pipe group, which comprises the following steps: starting an air conditioner for heating; recording the time required from the start of heating to the stabilization of the exhaust temperature of the compressor; judging whether the time required by stabilization is less than a first preset time or not; if yes, detecting the exhaust temperature in a stable state and the coil temperature of a heat exchanger of an indoor unit of the air conditioner; judging whether the difference value between the exhaust temperature and the coil temperature in the stable state is smaller than a first preset temperature difference or not; and if so, determining that the one-way valve in the supercooling pipe group is in failure.

The method is suitable for the air conditioner supercooling pipe group. At present, there are heat exchangers that can change the flow path of refrigerant in the heat exchanger when the operation mode is changed, that is, heat exchangers having variable split capacity. This heat exchanger also has a check valve. The above-described method of detection of a check valve failure is not applicable to this new form of heat exchanger.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a method and a device for diagnosing a fault of a check valve of an air conditioner, the air conditioner and a storage medium, so as to provide a method for determining the fault of the check valve suitable for the heat exchanger.

In some embodiments, the air conditioner includes: the heat exchanger can change the circulation path of a refrigerant in the heat exchanger under the condition that the operation mode is changed; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant conveying pipelines; under the condition that the air conditioner operates in a heating mode, a first one-way valve is arranged on the refrigerant inflow side of each heat exchanger, and a second one-way valve is arranged on the refrigerant outflow side of each heat exchanger; the method comprises the following steps: determining an operation mode of the air conditioner; determining a plurality of target pipelines in each heat exchange branch and each refrigerant conveying pipeline according to an operation mode; and determining the fault condition of the first check valve and/or the second check valve according to the operation parameters of each target pipeline acquired in advance.

In some embodiments, the apparatus comprises: the air conditioner fault diagnosis system comprises a processor and a memory, wherein the memory stores program instructions, and the processor is configured to execute the method for diagnosing the fault of the air conditioner one-way valve when the program instructions are executed.

In some embodiments, the air conditioner includes: the heat exchanger can change the circulation path of a refrigerant in the heat exchanger under the condition that the operation mode is changed; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant conveying pipelines; the first check valve is arranged on the refrigerant inflow side of each heat exchange branch when the air conditioner operates in a heating mode; the second one-way valve is arranged on the refrigerant outflow side of each heat exchange branch when the air conditioner operates in a heating mode; and, a device for diagnosing a malfunction of a check valve of an air conditioner as aforementioned.

In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for diagnosing a malfunction of an air conditioner check valve.

The method and the device for diagnosing the fault of the air conditioner check valve, the air conditioner and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:

based on the variable flow dividing capacity of the heat exchanger and the special structure of the heat exchanger, a plurality of target pipelines needing to be monitored are determined according to the operation mode of the air conditioner. If the one-way valve is in fault, the flow of the refrigerant in the target pipeline is different from the normal condition, so that the operation parameters of the target pipeline are influenced. That is, the operating parameters of the target circuit may reflect the failure condition of the check valve from the side. Thus, a fault condition of the first check valve and/or the second check valve is determined based on the operating parameters of the target circuit. Therefore, the method for determining the fault of the one-way valve in the heat exchanger structure is provided, so that the fault condition of the one-way valve can be found in time, and the normal operation of the air conditioner is ensured.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic diagram of a refrigerant circulation loop according to an embodiment of the disclosure;

FIG. 2 is a schematic structural diagram of a heat exchanger provided by an embodiment of the present disclosure;

fig. 3 is a normal refrigerant circulation schematic diagram of the check valve provided in the embodiment of the present disclosure;

fig. 4 is a schematic view illustrating a check valve spool of the check valve for blocking the refrigerant flow rate;

fig. 5 is a schematic view illustrating a valve element of a one-way valve in place without refrigerant circulation according to an embodiment of the disclosure;

fig. 6 is a schematic diagram illustrating refrigerant leakage from an inclined valve element of a check valve according to an embodiment of the disclosure;

FIG. 7 is a schematic diagram of a method for diagnosing a fault of a check valve of an air conditioner according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of another method for diagnosing a fault of a check valve of an air conditioner provided by an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of another method for diagnosing a fault of a check valve of an air conditioner provided by an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of another method for diagnosing a fault of a check valve of an air conditioner provided by an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of an apparatus for diagnosing a fault of a check valve of an air conditioner according to an embodiment of the present disclosure;

fig. 12 is a schematic diagram of another device for diagnosing a fault of a check valve of an air conditioner according to an embodiment of the present disclosure.

Reference numerals:

10. a compressor; 20. an indoor heat exchanger; 30. an outdoor heat exchanger; 31. a first liquid separator; 32. a second liquid separator; 33. a third liquid distributor; 34. a fourth liquid distributor; 35. a first heat exchange branch; 36. a second heat exchange branch; 37. a third heat exchange branch; 38. a first bypass line; 381. a first check valve; 39. a second bypass line; 391. a second check valve; 40. a throttling device; 50. a first main tube; 60. a second main pipe; 70. a first sensor; 80. a second sensor; 90. a third sensor; 100. a fourth sensor; 110. a housing; 120. a valve core; 130. a limiting component; 140. a valve seat.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The term "plurality" means two or more, unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.

Referring to fig. 1, an embodiment of the present disclosure provides an air conditioner. This 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 circuit.

As shown in fig. 2, the outdoor heat exchanger 30 includes: a first liquid separator 31, a second liquid separator 32, a third liquid separator 33, a fourth liquid separator 34, a heat exchange pipeline and a refrigerant conveying pipeline.

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. Second heat exchange branch 36 is an intermediate heat exchange branch. The third heat exchange branch 37 is the uppermost heat exchange branch.

The refrigerant conveying pipeline includes: a first main pipe 50, a second main pipe 60, a first bypass line 38 and a second bypass line 39.

The liquid collecting end of the first liquid separator 31 communicates with the indoor heat exchanger 20 through the first main pipe 50.

The liquid separating end of the first liquid separator 31 is communicated with the first end of the first heat exchange branch 35. The liquid separating end of the first liquid separator 31 is also communicated with the liquid collecting end of the second liquid separator 32 through a first bypass pipeline 38. The first bypass line 38 is provided with a first check valve 381 for limiting the flow of the refrigerant in the first bypass line 38 only from the first liquid separator 31 to the second liquid separator 32.

The liquid separating end of the second liquid separator 32 is in communication with a first end of a second heat exchange branch 36. The liquid separating end of the second liquid separator 32 is also in communication with the first end of the third heat exchange branch 37.

And the second end of the first heat exchange branch 35 is communicated with the liquid separating end of the third liquid distributor 33. And the second end of the second heat exchange branch 36 is communicated with the liquid separating end of the third liquid distributor 33. The liquid collecting end of the third liquid distributor 33 is communicated with the liquid separating end of the fourth liquid distributor 34 through a second bypass pipeline 39. The second bypass line 39 is provided with a second check valve 391 for limiting the refrigerant in the second bypass line 39 to flow only from the third liquid separator 33 to the fourth liquid separator 34.

A second end of the third heat exchange branch 37 is communicated with the liquid separating end of the fourth liquid separator 34. The liquid collecting end of the fourth liquid distributor 34 is communicated with the throttling device 40 through a second main pipe 60.

When the air conditioner operates in the heating mode, the refrigerant flows in from the first main pipe 50. Under the action of the liquid separation of the first liquid separator 31 and the second liquid separator 32, the liquid flows into the first heat exchange branch 35, the second heat exchange branch 36 and the third heat exchange branch 37, respectively. And then joins in the second main pipe 60 to flow into the throttle device 40. Thus, all the heat exchange branches are connected in parallel.

When the air conditioner operates in the cooling mode, the refrigerant flows in from the second main pipe 60. And flows into the third heat exchange branch 37, the second heat exchange branch 36 and the first heat exchange branch 35 in sequence under the blocking action of the first check valve 381 and the second check valve 391. And finally flows into the indoor heat exchanger 20 through the first main pipe 50. Thus, all the heat exchange branches are connected in series.

It should be noted that the heat exchange pipeline may include more heat exchange branches and liquid distributors, and the specific connection manner may be as described above, so as to implement parallel connection of more heat exchange branches in the heating mode and serial connection of more heat exchange branches in the cooling mode.

If the air conditioner operates in the heating mode, the refrigerant inflow side of the outdoor heat exchanger is the right side of the outdoor heat exchanger in fig. 1, and the refrigerant outflow side is the left side of the outdoor heat exchanger in fig. 1. If the air conditioner operates in the cooling mode, the refrigerant inflow side of the outdoor heat exchanger is the left side of the outdoor heat exchanger in fig. 1, and the refrigerant outflow side is the right side of the outdoor heat exchanger in fig. 1.

The second main pipe 60 is provided with a first sensor 70. A second sensor 80 is arranged on the first heat exchange branch 35. The first main pipe 50 is provided with a third sensor 90. A fourth sensor 100 is disposed on the third heat exchanging branch 37. Each sensor is used to sense an operating parameter of the corresponding line, such as temperature or pressure.

The check valve includes: a housing 110, a valve core 120, a position limiting member 130, and a valve seat 140. When the fluid flows in the forward direction, the valve element 120 moves to the limit position along the inside of the housing 110 by the impact of the fluid. The fluid flows out along the gap between the spool 120 and the housing 110 and the stopper 130. The check valve is in a conducting state at this time. When the fluid flows in the reverse direction, the valve element 120 moves along the inside of the housing 110 to the position of the valve seat 140 by the impact of the fluid. The valve element 120 is completely in contact with the valve seat 140 without a gap, and fluid cannot flow out. The check valve is in a closed state at this time.

The spool 120 of the check valve is susceptible to the following failures when acted upon by fluid:

(1) as shown in fig. 3 and 4, if the cooling mode is operated, the valve element 120 is easily affected by the pulsation of the fluid flow when moving toward the position limiting part 130 (forward movement). The valve core 120 rotates and moves in the cavity and is clamped in the limiting part 130, so that the flow of the refrigerant is reduced;

(2) referring to fig. 5 and 6, if the heating mode is operated, when the valve element 120 moves toward the valve seat 140 (moves in a reverse direction), the valve element 120 may not be completely engaged with the valve seat 140 due to fluid impact, which may cause refrigerant leakage.

Therefore, it is necessary to determine the failure condition of the check valve in time.

Referring to fig. 7, an embodiment of the present disclosure provides a method for diagnosing a fault of a check valve of an air conditioner, including:

s701, the processor determines the operation mode of the air conditioner.

And S702, determining a plurality of target pipelines in each heat exchange branch and refrigerant conveying pipeline by the processor according to the operation mode.

And 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 acquired in advance.

When the air conditioner is operated, an operation mode of the air conditioner is determined, for example, a cooling mode or a heating mode of the air conditioner is determined. Specifically, when the air conditioner processor receives the instruction, the instruction is analyzed, so that the related control content is obtained. The processor may determine the current mode of operation by parsing the content obtained in the past. And determining a plurality of target pipelines from each heat exchange branch and each refrigerant conveying pipeline according to the operation mode of the air conditioner. And in the running process of the air conditioner, the running parameters of the target pipeline are obtained in real time through the sensors arranged on the item mark pipelines.

Alternatively, the operating parameter of the target circuit may be a circuit pressure or a circuit temperature. This is because: if the check valve fails, the temperature and pressure of the line may change. Therefore, the line pressure or the line temperature can reflect whether the check valve is in failure or not from the side. And if the operation parameter is the pipeline pressure, the sensor arranged on the target pipeline is a pressure sensor. And if the operation parameter is the pipeline temperature, the sensor arranged on the target pipeline is a temperature sensor.

And determining the fault condition of the first check valve and/or the second check valve according to the operating parameters of the target pipeline acquired in real time. It is possible to specifically determine which check valve is malfunctioning, and the type of malfunction.

In the embodiment of the disclosure, based on the variable flow dividing capability of the heat exchanger and the special structure thereof, a plurality of target pipelines to be monitored are firstly determined according to the operation mode of the air conditioner. If the one-way valve is in fault, the flow of the refrigerant in the target pipeline is different from the normal condition, so that the operation parameters of the target pipeline are influenced. That is, the operating parameters of the target circuit may reflect the failure condition of the check valve from the side. Accordingly, a fault condition of the first check valve and/or the second check valve is determined based on the operating parameter of the target circuit. Therefore, the method for determining the fault of the one-way valve in the heat exchanger structure is provided, so that the fault condition of the one-way valve can be found in time, and the normal operation of the air conditioner is ensured.

With reference to fig. 8, another method for diagnosing a fault of a check valve of an air conditioner according to an embodiment of the present disclosure includes:

s701, the processor determines the operation mode of the air conditioner.

And S712, under the condition that the operation mode is the cooling mode, the processor determines the first main pipe, the second main pipe and the bottommost heat exchange branch as target pipelines.

And S722, determining the first main pipe, the second main pipe, the bottommost heat exchange branch and the topmost heat exchange branch as target pipelines by the processor under the condition that the operation mode is the heating mode.

Because the flow direction of the refrigerant is different when the air conditioner operates in different modes, the function (conduction or blockage) of the one-way valve is different accordingly. Therefore, different operating parameters of the pipeline can be affected in different operating modes. Therefore, it is necessary to determine the target line based on the operation mode.

When the operation mode is a refrigeration mode, the check valve is required to have a blocking effect on the refrigerant. Taking the second check valve as an example, if the second check valve has a leakage fault, a part of the refrigerant does not pass through the heat exchanger and directly flows into the heat exchange branch at the lowest part. This has an effect on the operating parameters of the lowermost heat exchange branch. Similarly, if the first check valve fails to leak, it will affect the operating parameters of the first main pipe. In this case, the difference between the operating parameters of the second main pipe and the lowermost heat exchange branch pipe, and the difference between the operating parameters of the second main pipe and the first main pipe may be different from the difference in the normal case. Therefore, if the operation mode is the cooling mode, the first main pipe, the second main pipe and the lowermost heat exchange branch are determined as target pipes. Optionally, the sensor on the lowermost heat exchange branch (second sensor) is located in the non-heat exchanged part (with respect to the cooling mode). This is because: if the second check valve is arranged on the part passing through the heat exchanger, the detected operation parameters are the operation parameters after heat exchange, and whether the second check valve breaks down or not cannot be accurately judged.

When the operation mode is the heating mode, the check valve is required to conduct the refrigerant. Taking the first check valve as an example, if the first check valve has a blocking fault, more refrigerants can enter the bottommost heat exchange branch, and the refrigerants entering other heat exchange branches become less. This has an effect on the operating parameters of the individual heat exchange branches. And the front and the back of the middle heat exchange branch are respectively provided with a one-way valve, and which one-way valve fails is difficult to judge through the operating parameters of the middle heat exchange branch. The refrigerant only has one check valve on the circulation path of the heat exchange branch at the bottom and the heat exchange branch at the top, and the position of the check valve with a fault is easy to judge. In this case, the difference between the operating parameters of the first main pipe and the uppermost heat exchange branch, the difference between the operating parameters of the first main pipe and the second main pipe, and the difference between the operating parameters of the first main pipe and the lowermost heat exchange branch are different from those in the normal case. Therefore, if the operation mode is the heating mode, the first main pipe, the second main pipe, the lowermost heat exchange branch pipe, and the uppermost heat exchange branch pipe are determined as the target pipes. Optionally, the sensor on the uppermost heat exchange branch is located at the heat exchanged part (with respect to the heating mode). This is because: if the one-way valve is arranged on the part which does not pass through the heat exchanger, the detected operation parameters are the operation parameters which do not pass through the heat exchanger, and whether the one-way valve fails or not can not be accurately judged.

Therefore, based on the operation mode of the air conditioner and the action of the one-way valve, in each heat exchange branch and refrigerant conveying pipeline, a proper pipeline is selected as a target pipeline to be monitored, so that the one-way valve with a fault can be accurately determined.

With reference to fig. 9, another method for diagnosing a fault of a check valve of an air conditioner according to an embodiment of the present disclosure includes:

s701, the processor determines the operation mode of the air conditioner.

S713, the processor determines a plurality of groups of comparison pipelines in the target pipeline.

And S723, calculating the difference value of the operating parameters of the comparison pipelines in the same group by the processor.

S733, the processor determines a failure condition of the first check valve and/or the second check valve according to the calculated plurality of differences.

And determining a plurality of groups of comparison pipelines which are a group of two target pipelines from the plurality of target pipelines. Calculating the difference of the operating parameters of the two target pipelines in the same group, and determining the fault condition of the first check valve and/or the second check valve by using the difference. For example, when the second check valve has a leakage fault, a part of the refrigerant does not pass through the heat exchanger and directly flows into the lowest heat exchange branch. The operating parameters (temperature or pressure) of the lowermost heat exchange branch will be lower. Therefore, whether the second one-way valve has a fault or not can be judged by utilizing the difference value of the operating parameters of the front and rear pipelines of the second one-way valve, namely the difference value of the operating parameters of the second main pipe and the lowermost heat exchange system.

Optionally, in step S713, the processor determines, in the target pipeline, a plurality of sets of comparison pipelines, including:

and under the condition that the operation mode is the refrigeration mode, the processor determines that the second main pipe and the bottommost heat exchange branch pipe are a first group of comparison pipelines, and the second main pipe and the first main pipe are a second group of comparison pipelines.

And under the condition that the operation mode is the heating mode, the processor determines that the first main pipe and the uppermost heat exchange branch are a third group of comparison pipelines, the first main pipe and the second main pipe are a fourth group of comparison pipelines, and the first main pipe and the lowermost heat exchange branch are a fifth group of comparison pipelines.

When the operation mode is a refrigeration mode, if the second one-way valve has a leakage fault, part of the refrigerant flowing out of the second main pipe directly flows into the lowest heat exchange branch without heat exchange, and then flows into the first main pipe. If the first check valve has a leakage fault, a part of refrigerant directly enters the first main pipe through the first check valve and the first liquid separator, and the refrigerant flowing into the heat exchange branch at the lowest part is reduced. The difference value of the operating parameters of the second main pipe and the lowest heat exchange branch and the difference value of the operating parameters of the second main pipe and the first main pipe are different from the normal conditions under the two conditions. Therefore, the second main pipe and the lowest heat exchange branch pipe are determined to be a first group of comparison pipelines, and the second main pipe and the first main pipe are determined to be a second group of comparison pipelines. And determining the fault condition of the first check valve and/or the second check valve through the difference value of the operating parameters of the first group of comparison pipelines and the difference value of the operating parameters of the second group of comparison pipelines.

When the operation mode is the heating mode, if the second check valve breaks down, the refrigerant flow of the uppermost heat exchange branch can be increased, and the operation parameters of the uppermost heat exchange branch and the first main pipe are lower. Therefore, the first main pipe and the uppermost heat exchange branch are determined to be a third group of comparison pipelines, and the first main pipe and the second main pipe are determined to be a fourth group of comparison pipelines. And determining the fault condition of the second one-way valve by the difference of the operating parameters of the third group of comparison pipelines and the difference of the operating parameters of the fourth group of comparison pipelines. If the first check valve has a blocking fault, the refrigerant flow of the uppermost heat exchange branch can be reduced, and the refrigerant flow of the uppermost heat exchange branch can be increased. The operating parameters of the uppermost heat exchange branch can be higher, and the operating parameters of the lowermost heat exchange branch can be lower. Therefore, the first main pipe and the lowest heat exchange branch are determined to be a fifth group of comparison pipelines. And determining the fault condition of the first one-way valve by the difference of the operating parameters of the third group of comparison pipelines and the difference of the operating parameters of the fifth group of comparison pipelines.

Optionally, in step S733, the processor determines a fault condition of the first check valve and/or the second check valve according to the calculated multiple difference values, including:

and the processor determines that the first check valve has a leakage fault under the condition that the difference value of the operating parameters of the first group of comparison pipelines and the difference value of the operating parameters of the second group of comparison pipelines meet a first preset difference value condition.

And the processor determines that the second one-way valve has a leakage fault under the condition that the difference value of the operating parameters of the first group of comparison pipelines and the difference value of the operating parameters of the second group of comparison pipelines meet a second preset difference value condition.

And the processor determines that the first one-way valve has a blockage fault under the condition that the difference value of the operating parameters of the third group of comparison pipelines and the difference value of the operating parameters of the fourth group of comparison pipelines meet a third preset difference value condition.

And the processor determines that the second one-way valve has a blockage fault under the condition that the difference value of the operating parameters of the third group of comparison pipelines and the difference value of the operating parameters of the fifth group of comparison pipelines meet a fourth preset difference value condition.

And acquiring the operating parameter Sa of the second main pipe, the operating parameter Sb of the bottommost heat exchange branch pipe, the operating parameter Sc of the first main pipe and the operating parameter Sd of the topmost heat exchange branch pipe in real time through the sensors arranged on the target pipelines.

The first preset difference condition is as follows: sa-Sb is less than or equal to A, and Sa-Sc is less than or equal to B. Wherein A is a first parameter threshold value, and B is a second parameter threshold value.

The second preset difference condition is: sa-Sb is more than or equal to C, and Sa-Sc is less than or equal to D. Wherein, C is a third parameter threshold value, and D is a fourth parameter threshold value.

The third preset difference condition is as follows: sc-Sd is less than or equal to E, and Sc-Sa is less than or equal to F. Wherein, E is a fifth parameter threshold, and F is a sixth parameter threshold.

The fourth preset difference condition is as follows: sc-Sb is less than or equal to G, and Sc-Sd is more than or equal to H. Wherein G is a seventh parameter threshold, and H is an eighth parameter threshold.

And if the first preset difference condition is met, determining that the first one-way valve has a leakage fault. And if the second preset difference condition is met, determining that the second one-way valve has a leakage fault. And if the third preset difference condition is met, determining that the first one-way valve has a blockage fault. And if the fourth preset difference condition is met, determining that the second one-way valve has a blocking fault.

Specific values of a first parameter threshold value A, a second parameter threshold value B, a third parameter threshold value C, a fourth parameter threshold value D, a fifth parameter threshold value E, a sixth parameter threshold value F, a seventh parameter threshold value G and an eighth parameter threshold value H are determined according to the operating frequency of the compressor. The processor of the air conditioner is stored with the correlation between the compressor running frequency and the parameter threshold value in advance. The association comprises a correspondence between one or more operating frequencies and a parameter threshold.

The following will specifically describe how to determine the correlation between the operating frequency and the parameter threshold by taking the operating parameter as the pipeline temperature as an example:

1. and when the air conditioner operates in a refrigeration mode, the second one-way valve is replaced by a leakage fault one-way valve. The compressor is controlled to operate at the lowest frequency M1 within its operating range. The temperatures Ta1, tb1, and Tc1 detected by the first, second, and third sensors are recorded. Because the second check valve leaks, part of the refrigerant directly enters the third liquid separator without passing through the heat exchanger for heat exchange, tb1 and Tc1 are lower. Ta1-Tb1= A1 and Ta1-Tc1= B1 were calculated, and the values of A1 and B1 were recorded. The compressor operating frequency is adjusted to M2, the above steps are repeated, and the values of A2, B2 are recorded. And (3) increasing the frequency of the compressor to the highest operation frequency Mn in the operation range at regular intervals of frequency difference, repeating the steps, and recording the numerical values as shown in the table 1.

TABLE 1 correlation of compressor operating frequency to first and second temperature thresholds

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

2. And when the air conditioner operates in a refrigeration mode, the first check valve is replaced by a leakage fault check valve. At this time, part of the refrigerant directly enters the first liquid separator without passing through the first check valve. The refrigerant flowing through the third liquid separator is reduced, resulting in higher Tb and lower Tc. The frequency of the compressor is controlled to run from M1 to Mn at regular frequency difference, and n groups of Ta, tb and Tc are recorded. Ta-Tb = C, ta-Tc = D were calculated as shown in table 2.

TABLE 2 compressor operating frequency correlation with third and fourth temperature thresholds

CompressorFrequency of	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

3. And when the air conditioner operates in a heating working condition, the second one-way valve is replaced by the one-way valve with the blockage fault. At this time, the flow rate of the refrigerant passing through the third heat exchange branch becomes large. Therefore, the temperature Td registered by the fourth sensor is low, and the temperature Ta registered by the first sensor is low. In the above manner, the compressors are controlled to operate at different frequencies. Temperatures Ta, tc and Td detected by the first sensor, the third sensor and the fourth sensor corresponding to different frequencies are recorded. Tc-Td = E and Tc-Ta = F are calculated. And obtaining the correlation of the compressor operation frequency with the fifth temperature threshold value E and the sixth temperature threshold value F.

4. And when the air conditioner operates in a heating working condition, the first one-way valve is replaced by the one-way valve with the blockage fault. 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 high, and the temperature Tb detected by the second sensor is low. In the above manner, the compressors are controlled to operate at different frequencies. And recording the temperatures Ta, tb and Td detected by the first sensor, the second sensor and the fourth sensor corresponding to different frequencies. Tc-Tb = G and Tc-Td = H were calculated. And obtaining the correlation of the compressor operation frequency with the seventh temperature threshold value G and the eighth temperature threshold value H.

If the operation parameter is the pipeline pressure, the determination method of the association relationship between the operation frequency of the compressor and each pressure threshold is the same as the above method, and the details are not repeated here.

And storing the obtained association relationship in the air conditioner processor. Therefore, when the air conditioner runs, the corresponding parameter threshold value can be obtained according to the running mode of the air conditioner and the running frequency of the compressor. If the operating frequency of the compressor is between the two frequencies in the table, interpolation is used to calculate the values of A, B, C, D, E, F, G, and H.

Referring to fig. 10, another method for diagnosing a fault of a check valve of an air conditioner according to an embodiment of the present disclosure includes:

and S701, the processor determines the operation mode of the air conditioner.

And S702, determining a plurality of target pipelines in each heat exchange branch and each refrigerant conveying pipeline by the processor according to an operation mode.

S704, the processor switches the running mode of the air conditioner for preset times to remove faults.

S705, the processor redetermines the fault conditions of the first one-way valve and the second one-way valve.

S706, the processor sends an alarm prompt under the condition that the first one-way valve and/or the second one-way valve still have faults.

After the first check valve and/or the second check valve are determined to be in fault, an alarm prompt is sent to a remote cloud end to remind an engineer of handling the fault of the check valves. Or automatically switching the operation mode, namely controlling the air conditioner to switch between the heating operation mode and the cooling operation mode. Due to the change of the operation mode, the flowing direction of the refrigerant in the heat exchanger is changed. Therefore, the valve core of the one-way valve is matched with the limiting part again by using the impact of the refrigerant on the valve core. The switching is performed a predetermined number of times, for example, 3 to 4 times. The failure conditions of the first and second check valves are then re-determined as previously described. If the first one-way valve and/or the second one-way valve still have a fault, it is likely that the valve spool is worn and needs to be replaced. Under the condition, the air conditioner sends an alarm prompt to remind a user or an engineer to replace the valve core in time. Optionally, the air conditioner may send the alarm prompt in various ways. For example, the air conditioner can send a voice alarm prompt through a voice module of the air conditioner to remind a user; the communication module can be in communication connection with terminal equipment (such as a mobile phone, a computer and the like) to send an alarm prompt to the terminal equipment so as to remind a user; and an alarm prompt can be sent to a remote cloud end to remind an engineer to process.

As shown in fig. 11, an embodiment of the present disclosure provides an apparatus for diagnosing a 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 an operation mode of the air conditioner. The second determining module 111 is configured to determine a plurality of target pipelines in each of the heat exchanging branch lines and the refrigerant conveying pipeline according to an operation mode. The third determining module 111 is configured to determine a fault condition of the first check valve and/or the second check valve according to the pre-obtained operation parameters of each target pipeline.

As shown in fig. 12, an embodiment of the present disclosure provides an apparatus for diagnosing a fault of a check valve of an air conditioner, which includes a processor (processor) 120 and a memory (memory) 121. Optionally, the apparatus may also include a Communication Interface 122 and a bus 123. The processor 120, the communication interface 122, and the memory 121 may communicate with each other through a bus 123. Communication interface 122 may be used for information transfer. The processor 120 may call logic instructions in the memory 121 to perform the method for diagnosing the air conditioner check valve malfunction of the above-described embodiment.

In addition, the logic instructions in the memory 121 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 121 serves as a computer-readable storage medium for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 120 executes functional applications and data processing by executing program instructions/modules stored in the memory 121, that is, implements the method for diagnosing the malfunction of the check valve of the air conditioner in the above-described embodiment.

The memory 121 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 121 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides an air conditioner, which comprises the device for diagnosing the fault of the air conditioner one-way valve.

The disclosed embodiments provide a storage medium storing computer-executable instructions configured to perform the above-described method for diagnosing a fault of a check valve of an air conditioner.

The storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising one of 8230," does not exclude the presence of additional like elements in a process, method or device comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for diagnosing a fault in a check valve of an air conditioner, the air conditioner comprising: the heat exchanger can change the circulation path of a refrigerant in the heat exchanger under the condition that the operation mode is changed; the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant conveying pipelines; under the condition that the air conditioner operates in a heating mode, a first one-way valve is arranged on the refrigerant inflow side of each heat exchanger, and a second one-way valve is arranged on the refrigerant outflow side of each heat exchanger; characterized in that the method comprises:

determining an operation mode of the air conditioner;

determining a plurality of target pipelines in each heat exchange branch and the refrigerant conveying pipeline according to an operation mode;

and determining 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.

2. The method of claim 1, wherein the refrigerant delivery line comprises: the heat exchanger comprises a first main pipe and a second main pipe, wherein the first main pipe is communicated with the bottommost heat exchange branch, and the second main pipe is communicated with the topmost heat exchange branch; when the operation mode is the heating mode, the first main pipe is positioned on the refrigerant inflow side of the heat exchanger, and the second main pipe is positioned on the refrigerant outflow side of the heat exchanger; according to the operation mode, determining a plurality of target pipelines in each heat exchange branch and the refrigerant conveying pipeline comprises the following steps:

under the condition that the operation mode is a refrigeration mode, determining the first main pipe, the second main pipe and the lowermost heat exchange branch as target pipelines;

and under the condition that the operation mode is a heating mode, determining the first main pipe, the second main pipe, the bottommost heat exchange branch pipe and the topmost heat exchange branch pipe as target pipelines.

3. The method of claim 2, wherein determining a fault condition of the first check valve and/or the second check valve based on pre-determined parameters of each target pipeline comprises:

in a target pipeline, determining a plurality of groups of comparison pipelines;

calculating the difference of the operating parameters of the comparison pipelines in the same group;

and determining the fault condition of the first check valve and/or the second check valve according to the plurality of calculated difference values.

4. The method of claim 3, wherein determining a plurality of sets of comparison lines in the target line comprises:

under the condition that the operation mode is a refrigeration mode, determining that the second main pipe and the lowermost heat exchange branch pipe are a first group of comparison pipelines, and determining that the second main pipe and the first main pipe are a second group of comparison pipelines;

under the condition that the operation mode is the heating mode, it is determined that the first main pipe and the uppermost heat exchange branch are a third group of comparison pipelines, the first main pipe and the second main pipe are fourth group of comparison pipelines, and the first main pipe and the lowermost heat exchange branch are a fifth group of comparison pipelines.

5. The method of any one of claims 1 to 4, wherein after said determining a fault condition of said first one-way valve and/or said second one-way valve, said method further comprises:

and switching the running mode of the air conditioner for preset times to eliminate faults.

6. The method of claim 5, wherein after the switching of the operation mode of the air conditioner a preset number of times, the method further comprises:

re-determining a fault condition of the first one-way valve and the second one-way valve;

and sending an alarm prompt under the condition that the first one-way valve and/or the second one-way valve still has a fault.

7. The method according to any one of claims 1 to 4,

the operating parameter is line pressure or line temperature.

8. An apparatus for diagnosing air conditioner check valve failure, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the method for diagnosing air conditioner check valve failure according to any one of claims 1 to 7 when executing the program instructions.

9. An air conditioner, comprising:

the heat exchanger can change the circulation path of a refrigerant in the heat exchanger under the condition that the operation mode is changed;

the heat exchanger includes: a plurality of heat exchange branches and a plurality of refrigerant conveying pipelines;

the first one-way valve is arranged on the refrigerant inflow side of each heat exchange branch when the air conditioner operates in a heating mode;

the second one-way valve is arranged on the refrigerant outflow side of each heat exchange branch when the air conditioner operates in the heating mode;

it is characterized by also comprising:

the apparatus for diagnosing a malfunction of a check valve of an air conditioner as recited in claim 8.

10. A storage medium storing program instructions, characterized in that the program instructions, when executed, perform a method for diagnosing a malfunction of a check valve of an air conditioner according to any one of claims 1 to 7.