Valve fault detection method, device and air conditioning unit

Abstract

The present application relates to a kind of valve fault detection method, device and air conditioning unit, comprising: by heating mode, obtain the indoor environment inlet air temperature of initial state, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature, and after compressor operation, obtain the indoor environment inlet air temperature of operating state, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature, by the temperature variation of indoor heat exchanger tube temperature and the variation of outdoor heat exchanger tube temperature are judged, if indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature compared with initial state, all do not have too big change, then it is either small valve is opened and large valve is not opened, this kind of situation is all to cause the risk of compressor jam or explosion, need to close compressor in time, protect compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor protection, in particular to a valve fault detection method and device and air conditioning unit. BACKGROUND

[0002] In recent years, the air conditioner after-sales network and production workshop have appeared the problem of no heating during the heating process of the air conditioner. The phenomenon is that the compressor has no suction and exhaust, the current is very small, and the compressor is in an idle state. After dissection, it is found that the compressor upper cover wiring and stator coil have no abnormalities, the compressor piston can rotate normally, the slider is stuck in the cylinder slider groove, the slider suction and exhaust sides have abrasion marks, there is no foreign matter on the slider, the upper and lower bearing planes have high temperature and high pressure phenomena, and other parts have no abnormalities. Cutting the lower cover: the lower cover is deformed and has a downward protrusion phenomenon. Individual network points even have the vicious accident of compressor explosion during debugging or maintenance, which injures people. Through experiments, it is found that if one or all of the large and small valves connected between the indoor and outdoor units are not opened during the air conditioner production process, installation and debugging, and experimental testing, it will lead to the problem that the system cannot be identified due to abnormal cut-off during the heating process of the air conditioner. In order to protect the compressor, it is necessary to verify whether the large and small valves are faulty and cause the valves to be not opened during operation or testing.

[0003] From the principle of the air conditioner, when the large and small valves are opened, the system exhaust pressure and exhaust temperature will rise after the compressor works in the heating mode, the indoor heat exchanger pipe temperature sensing temperature package temperature will also rise, and the outdoor heat exchanger pipe temperature sensing temperature package temperature will decrease. The indoor return air temperature will slowly rise. The outdoor unit is generally placed outdoors, and the inlet air temperature changes little. If the large and small valves are not opened or the large valve is not opened and the small valve is opened, the system exhaust pressure will rise sharply after heating. Since the system has no refrigerant circulation, the indoor heat exchanger pipe temperature will not rise, the outdoor heat exchanger pipe temperature sensing temperature package temperature will not decrease, and the exhaust pressure changes the most. The indoor heat exchanger pipe temperature and the outdoor heat exchanger pipe temperature change little. If the small valve is not opened and the large valve is opened, the refrigerant enters the indoor heat exchanger, which is equivalent to a container. The exhaust pressure will not rise too high, and the danger is not great. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a valve fault detection method and device and air conditioning unit to solve the problem that the compressor is stuck or even exploded due to the failure of the large and small valves and the failure of one of the valves to cause the valves to be not opened in the prior art.

[0005] According to a first aspect of the embodiment of the present application, a valve fault detection method is provided, comprising:

[0006] After the air conditioner is powered on, a heating model is run to obtain an indoor environment inlet air temperature, an indoor heat exchanger tube temperature and an outdoor heat exchanger tube temperature in an initial state;

[0007] The compressor is running, and the indoor environment inlet air temperature, the indoor heat exchanger tube temperature and the outdoor heat exchanger tube temperature are continuously obtained in a time period T;

[0008] In the time period T, the temperature change of the indoor heat exchanger tube temperature compared with the initial state is continuously calculated by considering the influence of the heat dissipation of the electric heating tube on the indoor environment and the indoor heat exchanger tube temperature;

[0009] In the time period T, the temperature change of the outdoor heat exchanger tube temperature compared with the initial state is continuously calculated;

[0010] In the time period T, if the temperature change of the indoor heat exchanger tube temperature is less than or equal to a preset first temperature threshold value and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to a preset second temperature threshold value, the controller controls the compressor to stop running.

[0011] Preferably,

[0012] The controller controlling the compressor to stop running comprises:

[0013] The controller controls the compressor to stop running, and the stop time is a preset time threshold T1; during the time when the compressor stops running, the outdoor fan and the indoor fan continuously run;

[0014] After the time T1, the controller controls the compressor to continue running, and the temperature change of the indoor heat exchanger tube temperature and the temperature change of the outdoor heat exchanger tube temperature are judged again; if the temperature change of the indoor heat exchanger tube temperature is less than or equal to the preset first temperature threshold value and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to the preset second temperature threshold value, the controller controls the compressor to stop running again;

[0015] The above steps are repeated until a preset number of times are met, the controller reports a fault code, and the air conditioner stops running.

[0016] Preferably,

[0017] When the temperature change of the indoor heat exchanger tube temperature is less than or equal to the preset first temperature threshold value and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to the preset second temperature threshold value, the running frequency of the compressor at this time is obtained;

[0018] When the running frequency of the compressor is greater than a preset frequency threshold value, the controller controls the compressor to stop running.

[0019] Preferably,

[0020] When the compressor is running, the air conditioner air deflector is turned to the highest position;

[0021] When the indoor environment inlet air temperature is less than a preset third temperature threshold, the indoor fan is not working.

[0022] Preferably, comprising:

[0023] The first temperature threshold is greater than the second temperature threshold.

[0024] Preferably, further comprising:

[0025] If the high pressure switch is not set in the air conditioner, whether the controller needs to report a fault code is determined according to the above steps;

[0026] If the high pressure switch is set in the air conditioner, after the compressor is running, the air conditioner exhaust pressure is obtained, when the exhaust pressure is greater than a preset pressure threshold, the controller controls the compressor to stop running, and after a time T1, the compressor is running again;

[0027] The above steps are repeated until a preset number of times are met, the controller reports a fault code, and the air conditioner stops running.

[0028] Preferably,

[0029] The fault code comprises:

[0030] The air conditioner large valve stop valve and the small valve stop valve both fail, so that the large valve stop valve and the small valve stop valve are not opened;

[0031] Or,

[0032] The air conditioner large valve stop valve fails, so that the large valve stop valve is not opened, and the small valve stop valve is normally opened.

[0033] Preferably,

[0034] The indoor environment inlet air temperature is obtained by an environment temperature sensing package on the indoor heat exchanger;

[0035] The indoor heat exchanger tube temperature is obtained by a tube temperature sensing package on the indoor heat exchanger;

[0036] The outdoor heat exchanger tube temperature is obtained by a tube temperature sensing package on the outdoor heat exchanger.

[0037] According to a second aspect of the embodiment of the present application, a valve fault detection device is provided, comprising:

[0038] An initial temperature acquisition module: when the air conditioner is powered on and runs in a heating mode, the indoor environment inlet air temperature, the indoor heat exchanger tube temperature, and the outdoor heat exchanger tube temperature in an initial state are obtained;

[0039] The running temperature acquisition module: the compressor is running, and the indoor environment inlet air temperature, the indoor heat exchanger tube temperature and the outdoor heat exchanger tube temperature are continuously acquired in a time period T.

[0040] The temperature change calculation module: used for continuously calculating the temperature change of the indoor heat exchanger tube temperature compared with the initial state in the time period T, considering the influence of the electric heating pipe heat dissipation on the indoor heat exchanger on the indoor environment and the indoor heat exchanger tube temperature.

[0041] The temperature change of the outdoor heat exchanger tube temperature compared with the initial state is continuously calculated in the time period T.

[0042] The judgment control module: used for controlling the compressor to stop running if the temperature change of the indoor heat exchanger tube temperature is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to a preset second temperature threshold in the time period T.

[0043] According to a third aspect of the embodiment of the present application, an air conditioning unit is provided, comprising:

[0044] The memory, in which program instructions are stored;

[0045] The controller is used for executing the program instructions stored in the memory, and executes the method as described above.

[0046] The technical scheme provided by the embodiment of the present application can include the following beneficial effects:

[0047] The present application acquires the indoor environment inlet air temperature, the indoor heat exchanger tube temperature and the outdoor heat exchanger tube temperature in the initial state under the heating mode, and acquires the indoor environment inlet air temperature, the indoor heat exchanger tube temperature and the outdoor heat exchanger tube temperature in the running state after the compressor is running, and judges the temperature change of the indoor heat exchanger tube temperature and the temperature change of the outdoor heat exchanger tube temperature, if the indoor heat exchanger tube temperature and the outdoor heat exchanger tube temperature do not change too much compared with the initial state, it is indicated that either the large valve is not opened or the small valve is opened, and the compressor needs to be closed in time to protect the compressor.

[0048] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0049] The drawings incorporated into the specification and forming a part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application.

[0050] Figure 1is a flow chart of a valve fault detection method according to an exemplary embodiment;

[0051] Figure 2 is a schematic diagram of an air conditioner operating principle system according to another exemplary embodiment;

[0052] Figure 3 is a detailed flow chart of a valve fault detection method according to another exemplary embodiment;

[0053] Figure 4 is a system schematic diagram of a valve fault detection device according to an exemplary embodiment;

[0054] In the drawings: 1 - compressor, 2 - four-way reversing valve, 3 - outdoor heat exchanger, 4 - throttling device, 5 - indoor heat exchanger, 6 - indoor fan, 7 - outdoor fan, 8 - electric heating tube, 9 - ambient temperature sensing package, 10 - indoor heat exchanger tube temperature sensing package, 11 - large valve stop valve, 12 - small valve stop valve, 101 - initial temperature acquisition module, 102 - operating temperature acquisition module, 103 - temperature change calculation module, 104 - judgment control module. DETAILED DESCRIPTION

[0055] The exemplary embodiments will be described in detail herein below with reference to the drawings. When the following description refers to the drawings, identical numbers on different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present invention. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present invention, as detailed in the appended claims.

[0056] Embodiment One

[0057] Figure 1 is a flow chart of a valve fault detection method according to an exemplary embodiment, as shown in Figure 1 , including:

[0058] S1, after the air conditioner is powered on, it runs in a heating model to obtain the indoor environment inlet air temperature, indoor heat exchanger tube temperature, and outdoor heat exchanger tube temperature under the initial state;

[0059] S2, the compressor runs, and the indoor environment inlet air temperature, indoor heat exchanger tube temperature, and outdoor heat exchanger tube temperature are continuously obtained within a time period T;

[0060] S3, in the time period T, considering the influence of the heat dissipation of the electric heating pipe on the indoor heat exchanger on the indoor environment and the pipe temperature of the indoor heat exchanger, continuously calculate the temperature change of the pipe temperature of the indoor heat exchanger compared with the initial state; in the time period T, continuously calculate the temperature change of the pipe temperature of the outdoor heat exchanger compared with the initial state;

[0061] S4, in the time period T, if the temperature change of the pipe temperature of the indoor heat exchanger is less than or equal to the preset first temperature threshold value and the temperature change of the pipe temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold value, the controller controls the compressor to stop running;

[0062] It can be understood that, as shown in the accompanying Figure 1 or the accompanying Figure 3 , when the air conditioner is tested or debugged by the customer, the air conditioner is powered on, and the air conditioner runs in the heating mode to obtain the ambient inlet air temperature T0 内环 , the pipe temperature T0 内管 of the indoor heat exchanger and T0 外管 ; the compressor runs, and the indoor ambient inlet air temperature T1 内环 , the pipe temperature T1 内管 of the indoor heat exchanger and the pipe temperature T1 外管 of the outdoor heat exchanger are continuously obtained in the time period T; in the time period T, considering the influence of the heat dissipation of the electric heating pipe on the indoor heat exchanger on the indoor environment and the pipe temperature of the indoor heat exchanger, continuously calculate the temperature change of the pipe temperature of the indoor heat exchanger compared with the initial state, which is represented by the formula △△T1=△T1-△T0, wherein the △T1=T1 内管 -T1 内环 , and the △T0=T0 内管 -T0 内环 ; in the time period T, continuously calculate the temperature change of the pipe temperature of the outdoor heat exchanger compared with the initial state, which is represented by the formula △T1 外管 =T0 外管 -T1 外管 ; then judge whether △△T1 is less than or equal to the preset first temperature threshold value, and whether △T1 外管 is less than or equal to the preset second temperature threshold value, if both conditions are met, it means that the size stop valve of the air conditioner is not opened or the large stop valve in the size stop valve is not opened, and the exhaust pressure of the air conditioner is too large, so the controller closes the compressor to avoid the situation that the compressor is stuck or even explodes.

[0063] In order to more conveniently understand the above-mentioned scheme, the application also discloses a system schematic diagram of air conditioner heating principle, as shown in the accompanying Figure 2 , when heating, the four-way valve 2 is powered on, and the sliding bowl of the four-way valve 2 is in the accompanying Figure 2In the position of the compressor 1 exhaust by exhaust pipe to four-way reversing valve 2 D pipe, then to the E pipe, and then through the large stop valve 11 into the indoor heat exchanger 9 condensation, then the high-pressure medium-temperature liquid through the small stop valve 12 into the throttling device 4 throttling pressure reduction, and then into the outdoor heat exchanger 3 heat exchange, and then through the four-way reversing valve 2 C pipe, S pipe into the compressor 1 to complete a cycle;

[0064] In the heating mode, the system exhaust pressure, exhaust temperature will rise after the compressor 1 work, indoor heat exchanger tube temperature temperature sensing temperature package 10 temperature will also rise, outdoor heat exchanger tube temperature temperature sensing temperature package temperature will decrease, indoor return air temperature will slowly rise, outdoor unit is generally placed in the outdoor side, the temperature change of the air inlet is not large.

[0065] If the large and small stop valves are not opened or the large valve is not opened and the small valve is opened, the system exhaust pressure will rise sharply after heating operation, and since the system has no refrigerant circulation, the indoor heat exchanger tube temperature temperature will not rise, and the outdoor heat exchanger tube temperature temperature sensing temperature package temperature will not decrease. The largest change is the exhaust pressure, and the indoor heat exchanger tube temperature temperature and the outdoor heat exchanger tube temperature temperature change little, which can be used as a judgment condition.

[0066] If the small valve is closed and the large valve is opened, the refrigerant enters the indoor heat exchanger 5, which is equivalent to a container, and the exhaust pressure will not rise too high, and the danger is not great.

[0067] Now the domestic split wall-mounted machine has a PTC electric auxiliary heating of more than 1000W, and the floor type air conditioner PTC electric auxiliary heating is more than 2000W. If only the indoor heat exchanger tube temperature change is used as a judgment condition (small room or laboratory influence is greater), the judgment will be affected by the heat of the electric heating tube and the large valve not completely closed.

[0068] Preferably,

[0069] The controller controls the compressor to stop running includes:

[0070] The controller controls the compressor to stop running, and the stop time is a preset time threshold T1. During the time when the compressor stops running, the outdoor fan and the indoor fan continue to run;

[0071] After the time T1, the controller controls the compressor to continue to run, and the temperature change of the indoor heat exchanger tube temperature and the temperature change of the outdoor heat exchanger tube temperature are judged again. If the temperature change of the indoor heat exchanger tube temperature is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to a preset second temperature threshold, the controller controls the compressor to stop running again;

[0072] Repeat the above steps until a preset number of times are met, the controller reports a fault code, and the air conditioner stops running;

[0073] Understandably, as shown in the attached document Figure 3 As shown, after the air conditioner is powered on for the first time, the number of runs C is set to 0. After the compressor stops running, the stop time T1 (generally 3 minutes depending on the system) is followed by the indoor and outdoor fans maintaining their previous operating modes. The running count C = C + 1. It is then determined whether C is greater than 2. If it is, a fault code is reported and the air conditioner stops running. If it is less than or equal to 2, the air conditioner controls the compressor to continue running after time T1 until C is greater than 2, or when it starts running again. If the temperature change of the indoor heat exchanger pipe is greater than the preset first temperature threshold and the temperature change of the outdoor heat exchanger pipe is greater than the preset second temperature threshold, it indicates that the low temperature change is not caused by the large and small shut-off valves not being open. To avoid misjudgment due to other reasons, multiple judgments are required.

[0074] Preferably,

[0075] When the temperature change of the indoor heat exchanger tube is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube is less than or equal to a preset second temperature threshold, the compressor operating frequency at this time is obtained.

[0076] When the compressor's operating frequency exceeds a preset frequency threshold, the controller stops the compressor from operating.

[0077] Understandably, as shown in the attached document Figure 3 As shown, when the temperature change of the indoor heat exchanger tube is less than or equal to the preset first temperature threshold and the temperature change of the outdoor heat exchanger tube is less than or equal to the preset second temperature threshold, the compressor's operating frequency can also be obtained. If the operating frequency is greater than the preset frequency threshold F, which is generally 30Hz, it indicates that the compressor failure is indeed caused by the large and small shut-off valves not being opened or the large shut-off valve not being opened. In this case, the controller shuts down the compressor. If the operating frequency is less than the preset frequency threshold F, the air conditioner continues to maintain normal operation.

[0078] Preferably,

[0079] When the compressor is running, the air conditioner's air deflector should be turned to its highest position.

[0080] When the indoor ambient air temperature is lower than the preset third temperature threshold, the indoor fan will not work.

[0081] It is understandable that when the compressor is running, the air conditioner's air deflector is turned to the top to avoid cold air blowing. When the indoor heat exchanger pipe temperature is lower than the third temperature threshold, which is generally 38°C, the indoor fan does not work. When the indoor heat exchanger pipe temperature is greater than or equal to 42°C, it runs at the set fan speed.

[0082] Preferably, it includes:

[0083] The first temperature threshold is greater than the second temperature threshold;

[0084] It can be understood that, since the indoor heat exchanger is provided with an electric heating tube, it will have certain influence on the ambient temperature and the tube temperature of the indoor heat exchanger, so when judging the temperature change, whether △△T1 is less than 3 degrees Celsius is judged, and whether △T1 外管 is less than 2 degrees Celsius, that is, the temperature change of △△T1 should be slightly larger than △T1 外管 .

[0085] Preferably, further comprising:

[0086] If the high-pressure switch is not provided in the air conditioner, whether the controller needs to report a fault code is judged according to the above steps;

[0087] If the high-pressure switch is provided in the air conditioner, after the compressor is operated, the exhaust pressure of the air conditioner is obtained, when the exhaust pressure is greater than the preset pressure threshold, the controller controls the compressor to stop operating, and after a time T1, the compressor is operated again;

[0088] The above steps are repeated until the preset number of times is met, the controller reports a fault code, and the air conditioner stops operating;

[0089] It can be understood that the above scheme is for the air conditioner without a pressure switch, and if the air conditioner itself has a pressure switch, if the refrigerant is R410A or R32, when the exhaust pressure of the air conditioner is greater than the preset pressure threshold, generally 4.8 MPa, the compressor stops operating, and resumes operating after T1 time, that is, three minutes, if the exhaust pressure is still greater than 4.8 MPa, a fault code or an audible and visual alarm is reported, and the operation cannot be resumed and needs to be powered off before operating.

[0090] Preferably,

[0091] The fault code comprises:

[0092] Both the large valve stop valve and the small valve stop valve of the air conditioner are faulty, so that both the large valve stop valve and the small valve stop valve are not opened;

[0093] Or,

[0094] The large valve stop valve of the air conditioner is faulty, so that the large valve stop valve is not opened and the small valve stop valve is normally opened;

[0095] It can be understood that the fault code needs to express the reason for the fault, and through the above description, we know that the reason for the fault can be that both the large stop valve and the small stop valve are not opened, or that the large stop valve is not opened and the small stop valve is opened.

[0096] Preferably,

[0097] The indoor ambient air intake temperature is obtained by an ambient temperature sensor on the indoor heat exchanger.

[0098] The tube temperature of the indoor heat exchanger is obtained by a tube temperature sensing bulb on the indoor heat exchanger.

[0099] The temperature of the outdoor heat exchanger tubes is obtained by a tube temperature sensor on the outdoor heat exchanger.

[0100] It is understandable that the controller obtains the indoor ambient air intake temperature, indoor heat exchanger pipe temperature, and outdoor heat exchanger pipe temperature through temperature sensors installed in various parts of the air conditioner. These temperature sensors are components inherent to the air conditioner itself.

[0101] Example 2

[0102] This embodiment also discloses a valve fault detection device, as shown in the attached figure. Figure 4 As shown, it includes:

[0103] Initial temperature acquisition module 101: used to acquire the indoor ambient air inlet temperature, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature in the initial state when the air conditioner is powered on and running in heating mode.

[0104] Operating temperature acquisition module 102: When the compressor is running, it continuously acquires the indoor ambient air inlet temperature, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature within a time period T.

[0105] Temperature change calculation module 103: It is used to continuously calculate the temperature change of the indoor heat exchanger tube temperature compared with the initial state, considering the impact of heat dissipation of the electric heating tube on the indoor heat exchanger on the indoor environment and the indoor heat exchanger tube temperature within a time period T.

[0106] Within a time period T, the temperature change of the outdoor heat exchanger tubes compared to the initial state is continuously calculated.

[0107] Judgment control module 104: If, within a time period T, the temperature change of the indoor heat exchanger tube temperature is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to a preset second temperature threshold, the controller controls the compressor to stop running.

[0108] It is understood that this application is applied to the controller of an air conditioning unit. The initial temperature acquisition module 101 is used when the air conditioner is powered on and running in heating mode, acquiring the indoor ambient air inlet temperature, indoor heat exchanger tube temperature, and outdoor heat exchanger tube temperature in the initial state. The operating temperature acquisition module 102 is used when the compressor is running, continuously acquiring the indoor ambient air inlet temperature, indoor heat exchanger tube temperature, and outdoor heat exchanger tube temperature within a time period T. The temperature change calculation module 103 is used within a time period T to continuously calculate the temperature change of the indoor heat exchanger tube temperature compared to the initial state, considering the impact of heat dissipation from the electric heating tubes on the indoor heat exchanger on the indoor environment and the indoor heat exchanger tube temperature, and continuously calculating the temperature change of the outdoor heat exchanger tube temperature compared to the initial state. The judgment control module 104 is used within a time period T to control the compressor to stop running and protect the compressor if, simultaneously, the temperature change of the indoor heat exchanger tube temperature is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to a preset second temperature threshold.

[0109] Example 3

[0110] This application also provides an air conditioning unit, including:

[0111] A memory, wherein program instructions are stored;

[0112] The controller is used to execute program instructions stored in the memory, and to perform the methods described above.

[0113] It is understood that the aforementioned storage device can be a read-only memory, a disk, or an optical disk, etc.

[0114] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0115] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0116] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0117] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0118] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0119] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0120] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0121] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0122] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A valve fault detection method, applied in a controller, characterized in that, include: After the air conditioner is powered on, it runs in heating mode to obtain the indoor ambient air temperature, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature under the initial conditions. The compressor operates and continuously acquires the indoor ambient air inlet temperature, indoor heat exchanger tube temperature, and outdoor heat exchanger tube temperature within a time period T. Within a time period T, considering the impact of heat dissipation from the electric heating tubes on the indoor heat exchanger on the indoor environment and the temperature of the indoor heat exchanger tubes, the temperature change of the indoor heat exchanger tubes compared to the initial state is continuously calculated; specifically, it is calculated using the formula ΔΔT1=(T1 inner tube - T1 inner ring) - (T0 inner tube - T0 inner ring), where T1 inner tube is the indoor heat exchanger tube temperature obtained within the time period T, and T1... 内环 The indoor ambient air inlet temperature is obtained within the time period T, T0. 内管 The initial temperature of the indoor heat exchanger tubes, T0. 内环 The initial indoor air intake temperature; Within a time period T, the temperature change of the outdoor heat exchanger tubes compared to the initial state is continuously calculated. Within a time period T, if the temperature change of the indoor heat exchanger tubes is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tubes is less than or equal to a preset second temperature threshold, the controller controls the compressor to stop running; the first temperature threshold is greater than the second temperature threshold.

2. The method according to claim 1, characterized in that, The controller controls the compressor to stop operating, including: The controller stops the compressor from running for a preset time threshold T1. During the compressor stop time, the outdoor fan and indoor fan continue to run. After time T1, the controller controls the compressor to continue running and judges the temperature change of the indoor heat exchanger tube and the temperature change of the outdoor heat exchanger tube again. If the temperature change of the indoor heat exchanger tube is less than or equal to the preset first temperature threshold and the temperature change of the outdoor heat exchanger tube is less than or equal to the preset second temperature threshold, the controller controls the compressor to stop running again. Repeat the above steps until the preset number of times is met. The controller will then report a fault code, and the air conditioner will stop operating.

3. The method according to claim 2, characterized in that, When the temperature change of the indoor heat exchanger tube temperature is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube temperature is less than or equal to a preset second temperature threshold, the compressor operating frequency at this time is obtained. When the compressor's operating frequency exceeds a preset frequency threshold, the controller stops the compressor from operating.

4. The method according to claim 3, characterized in that, When the compressor is running, the air conditioner's air deflector should be turned to its highest position. When the indoor ambient air temperature is lower than the preset third temperature threshold, the indoor fan will not work.

5. The method according to any one of claims 1-4, characterized in that, Also includes: If the air conditioner does not have a high-pressure switch, follow the steps above to determine whether the controller needs to report a fault code. If the air conditioner is equipped with a high-pressure switch, the air conditioner's exhaust pressure will be obtained after the compressor starts running. When the exhaust pressure is greater than the preset pressure threshold, the controller will control the compressor to stop running. After time T1, the compressor will start running again. Repeat the above steps until the preset number of times is met. The controller will then report a fault code, and the air conditioner will stop operating.

6. The method according to claim 5, characterized in that, The fault codes include: Both the large valve and the small valve of the air conditioner are malfunctioning, resulting in neither valve opening. or, The air conditioner's main shut-off valve is malfunctioning, causing it to remain closed while the smaller shut-off valve opens normally.

7. The method according to any one of claims 1-4, characterized in that, The indoor ambient air intake temperature is obtained by an ambient temperature sensor on the indoor heat exchanger. The tube temperature of the indoor heat exchanger is obtained by a tube temperature sensing bulb on the indoor heat exchanger. The temperature of the outdoor heat exchanger tubes is obtained through a tube temperature sensor on the outdoor heat exchanger.

8. A valve fault detection device, characterized in that, include: Initial temperature acquisition module: used to acquire the indoor ambient air inlet temperature, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature in the initial state when the air conditioner is powered on and running in heating mode. Operating temperature acquisition module: When the compressor is running, it continuously acquires the indoor ambient air inlet temperature, indoor heat exchanger tube temperature and outdoor heat exchanger tube temperature within a time period T. Temperature Change Calculation Module: This module continuously calculates the temperature change of the indoor heat exchanger tubes compared to the initial state, considering the impact of heat dissipation from the heating elements on the indoor environment and the tube temperature of the indoor heat exchanger within a time period T. Specifically, it calculates the temperature change using the formula ΔΔT1 = (T1 inner tube - T1 inner ring) - (T0 inner tube - T0 inner ring), where T1 inner tube is the indoor heat exchanger tube temperature obtained within time period T, T1 inner ring is the indoor ambient air inlet temperature obtained within time period T, and T0... 内管 The initial temperature of the indoor heat exchanger tubes, T0. 内环 The initial indoor air intake temperature; Within a time period T, the temperature change of the outdoor heat exchanger tubes compared to the initial state is continuously calculated. Judgment control module: If, within a time period T, the temperature change of the indoor heat exchanger tube is less than or equal to a preset first temperature threshold and the temperature change of the outdoor heat exchanger tube is less than or equal to a preset second temperature threshold, the controller controls the compressor to stop running; the first temperature threshold is greater than the second temperature threshold.

9. An air conditioning unit, characterized in that, include: A memory, wherein program instructions are stored; A controller for executing program instructions stored in memory to perform the method as described in any one of claims 1-7.

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