WO2020133915A1

WO2020133915A1 - Valve body failure detection method of air conditioning system and air conditioning system

Info

Publication number: WO2020133915A1
Application number: PCT/CN2019/089849
Authority: WO
Inventors: 王命仁; 李骏; 杨国忠; 谭志军
Original assignee: 合肥美的暖通设备有限公司; 广东美的暖通设备有限公司
Priority date: 2018-12-29
Filing date: 2019-06-03
Publication date: 2020-07-02
Also published as: CN109708248A; CN109708248B

Abstract

A valve body failure detection method of an air conditioning system (100) and the air conditioning system (100). The air conditioning system (100) comprises at least two outdoor units (10), and the outdoor units (10) comprise heat exchangers (12), and throttling valves (14) connected to the heat exchangers (12). The detection method comprises: when the superheat degree of a compressor of the operated outdoor unit (10) is less than a first threshold, obtaining a coiler temperature of the heat exchanger (12) of the unoperated outdoor unit (10); determining whether a difference absolute value between the coiler temperature and an outdoor environment temperature is greater than a second threshold; and if the difference absolute value between the coiler temperature and the outdoor environment temperature is greater than the second threshold, determining the failure of the throttling valve (14) of the unoperated outdoor unit (10).

Description

Valve body failure detection method of air conditioning system and air conditioning system

Priority information

This application requests the priority and rights of the patent application with the patent application number 201811631070.1 filed with the State Intellectual Property Office of China on December 29, 2018, and the full text of which is hereby incorporated by reference.

Technical field

The present application relates to the technical field of air conditioning, and in particular, to a valve body failure detection method of an air conditioning system and an air conditioning system.

Background technique

In a multi-connected air conditioning system with multiple outdoor units connected in parallel, when it is not necessary to fully open all outdoor units, the outdoor units are usually turned on in turn, which can effectively improve the service life of the air conditioning system. During the operation of the air conditioning system, the electronic expansion valve connected to the outdoor heat exchanger may fail due to the heating of the valve body's own electromagnetic coil, or the port of the control main board may be unsoldered to cause the electronic expansion valve to fail. The failure of the electronic expansion valve will cause the operating parameters of the air-conditioning system to change and cannot effectively execute the control logic, thus resulting in poor reliability of the air-conditioning system.

Summary of the invention

The embodiments of the present application provide a valve body failure detection method of an air conditioning system and an air conditioning system.

The valve body failure detection method according to an embodiment of the present application is applied to an air conditioning system. The air conditioning system includes at least two outdoor units. The outdoor unit includes a heat exchanger and a throttle valve connected to the heat exchanger. The detection Methods include:

When the compressor superheat of the outdoor unit in operation is less than the first threshold, obtain the coil temperature of the heat exchanger of the outdoor unit that is not in operation;

Determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold;

When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, it is determined that the throttle valve of the outdoor unit that has not been operated fails.

The valve body failure detection method of the air-conditioning system according to the embodiment of the present application can determine the throttle valve of the non-operating outdoor unit according to the absolute value of the difference between the coil temperature of the heat exchanger of the non-operating outdoor unit and the outdoor ambient temperature Whether it fails, so as to ensure the reliability of the air conditioning system.

In some embodiments, when the compressor superheat of the outdoor unit in operation is less than the first threshold, obtaining the coil temperature of the heat exchanger of the outdoor unit that is not in operation includes: When the degree of superheat of the compressor of the outdoor unit is less than the first threshold value and lasts for a first period of time, the coil temperature of the heat exchanger of the outdoor unit that is not in operation is obtained.

In some embodiments, when the compressor superheat of the outdoor unit in operation is less than the first threshold, obtaining the coil temperature of the heat exchanger of the outdoor unit that is not in operation includes: When the outdoor unit includes at least two and the minimum compressor superheat of the outdoor unit in operation is less than the first threshold, the coil temperature of the heat exchanger of the outdoor unit that is not in operation is obtained.

In some embodiments, the outdoor unit includes at least one heat exchanger, each of the heat exchangers is connected to the throttle valve, and the compressor superheat of the outdoor unit during operation is less than Obtaining the coil temperature of the heat exchanger of the outdoor unit that is not in operation at the first threshold includes: when the compressor superheat of the outdoor unit in operation is less than the first threshold, obtaining the same non-operation The coil temperature of all the heat exchangers of the outdoor unit; determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than a second threshold, including one of the following: one by one for each Whether the absolute value of the difference between the coil temperature of the heat exchanger and the outdoor ambient temperature is greater than the second threshold; selecting one of the coils among all the coil temperatures of the heat exchanger according to a preset condition Temperature and determine whether the absolute value of the difference between the selected coil temperature and the outdoor ambient temperature is greater than the second threshold.

In some embodiments, the preset condition is a minimum coil temperature among coil temperatures of all the heat exchangers of the same outdoor unit that is not in operation.

In some embodiments, when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, determining that the throttle valve of the outdoor unit that is not operating is ineffective includes: When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold value and lasts for a second duration, it is determined that the throttle valve of the outdoor unit that is not operating is invalid.

In some embodiments, the second threshold includes a first sub-threshold. When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold for a second duration, it is determined that The failure of the throttle valve of the outdoor unit in operation includes: in the pure heating mode, the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the first sub-threshold and continues During the second time period, it is determined that the throttle valve of the outdoor unit that has not been operated fails.

In some embodiments, the second threshold includes a second sub-threshold. When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold for a second duration, it is determined that the The failure of the throttle valve of the outdoor unit in operation includes: in the pure cooling mode, when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second sub-threshold value and continues During the second time period, it is determined that the throttle valve of the outdoor unit that has not been operated fails.

In some embodiments, the detection method includes: when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is not greater than the second threshold, it is determined that the throttle of the outdoor unit that is not operating The valve is effective.

In some embodiments, the detection method includes: after it is determined that the throttle valve of the outdoor unit that has not been operated fails, prompting a valve body failure.

An air conditioning system according to an embodiment of the present application. The air conditioning system includes at least two outdoor units and a controller. The outdoor unit includes a heat exchanger and a throttle valve connected to the heat exchanger. The controller is used to operate When the compressor superheat of the outdoor unit is less than the first threshold, obtain the coil temperature of the heat exchanger of the outdoor unit that is not in operation, and determine the difference between the coil temperature and the outdoor ambient temperature Whether the absolute value is greater than a second threshold, and used to determine that the throttle valve of the outdoor unit that is not operating is invalid when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold.

The air-conditioning system according to the embodiment of the present application can determine whether the throttle valve of the non-operating outdoor unit is invalid according to the absolute value of the difference between the coil temperature of the heat exchanger of the non-operating outdoor unit and the outdoor ambient temperature, thereby ensuring air conditioning System reliability.

In some embodiments, the controller is used to obtain the heat exchanger of the outdoor unit that is not in operation when the superheat of the compressor of the outdoor unit in operation is less than the first threshold for a first duration Coil temperature.

In some embodiments, the controller is used to obtain unoperated when the outdoor unit in operation includes at least two and the minimum compressor superheat of the outdoor unit in operation is less than the first threshold The coil temperature of the heat exchanger of the outdoor unit.

In some embodiments, the outdoor unit includes at least one of the heat exchangers, each of the heat exchangers is connected to the throttle valve, and the controller is used for the operation of the outdoor unit When the superheat of the compressor is less than the first threshold, the coil temperatures of all the heat exchangers of the same outdoor unit that are not in operation are obtained. The controller is used to determine the temperature of each heat exchanger one by one. Whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, or used to select one of the coil temperatures of all the heat exchanger coil temperatures according to a preset condition And it is determined whether the absolute value of the difference between the selected coil temperature and the outdoor ambient temperature is greater than the second threshold.

In some embodiments, the controller is configured to determine that the outdoor unit is not in operation when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold for a second duration Of the throttle valve failed.

In some embodiments, the second threshold includes a first sub-threshold. In the pure heating mode, the controller is used to determine that the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the When the first sub-threshold value lasts for the second duration, it is determined that the throttle valve of the outdoor unit that has not been operated fails.

In some embodiments, the second threshold includes a second sub-threshold. In the pure cooling mode, the controller is used for when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the first When two sub-thresholds continue for the second duration, it is determined that the throttle valve of the outdoor unit that has not been operated is invalid.

In some embodiments, the controller is used to determine that the throttle valve of the outdoor unit that is not operating when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is not greater than the second threshold effective.

In some embodiments, the controller is used to notify the valve body of a failure after determining that the throttle valve of the outdoor unit that has not been operated fails.

Additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be learned through practice of the present application.

BRIEF DESCRIPTION

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

1 is a schematic flowchart of a valve body failure detection method of an air conditioning system according to an embodiment of the present application;

2 is a schematic block diagram of an air-conditioning system according to an embodiment of the present application;

3 is another schematic flowchart of a valve body failure detection method of an air-conditioning system according to an embodiment of the present application;

4 is another schematic flowchart of a valve body failure detection method of an air conditioning system according to an embodiment of the present application;

FIG. 5 is another schematic flowchart of the valve body failure detection method of the air-conditioning system according to the embodiment of the present application;

6 is another schematic flowchart of a valve body failure detection method of an air conditioning system according to an embodiment of the present application;

7 is another schematic flowchart of the valve body failure detection method of the air-conditioning system according to the embodiment of the present application;

8 is another schematic flowchart of a valve body failure detection method of an air conditioning system according to an embodiment of the present application.

Symbol description of main components:

The air conditioning system 100, the outdoor unit 10, the heat exchanger 12, the throttle valve 14, the compressor 16, the four-way valve 18, the indoor unit 20, and the controller 30.

detailed description

The embodiments of the present application are described in detail below. The embodiments of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and cannot be construed as limiting the present application.

In the description of the embodiments of the present application, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically limited.

In the description of the embodiments of the present application, it should be noted that the terms “installation”, “connected”, and “connected” should be understood in a broad sense, for example, it can be a fixed connection or It is a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediary, it can be a connection between two components or two components Interaction. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

Please refer to FIGS. 1 and 2. The valve body failure detection method according to the embodiment of the present application is applied to the air conditioning system 100. The air-conditioning system 100 includes at least two outdoor units 10 and a plurality of indoor units 20. At least two outdoor units 10 are connected in parallel, a plurality of indoor units 20 are connected in parallel, and the outdoor units 10 are connected to the indoor units 20. The refrigerant circulates between the outdoor unit 10 and the indoor unit 20. In the air conditioning system 100, both the high-pressure pipe and the low-pressure pipe are connected in parallel. Each outdoor unit 10 includes a heat exchanger 12 and a throttle valve 14 connected to the heat exchanger 12. Each outdoor unit 10 also includes a compressor 16 and a four-way valve 18 connected to the compressor 16.

The throttle valve 14 adjusts the opening degree according to a preset program or a control signal to adjust the amount of cold coal entering the heat exchanger 12. For example, opening the large throttle valve 14 can increase the amount of cold coal entering the outdoor unit 10, and closing the small throttle valve 14 can reduce the amount of cold coal entering the outdoor unit 10. In the present application, the throttle valve 14 is an electronic expansion valve. Electronic expansion valves include electromagnetic expansion valves and electric expansion valves. Preferably, the throttle valve 14 is an electromagnetic expansion valve.

Please refer to Figure 1, the detection methods include:

Step S10: When the compressor superheat of the outdoor unit 10 in operation is less than the first threshold, obtain the coil temperature of the heat exchanger 12 of the outdoor unit 10 in operation;

Step S20: Determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold;

Step S30: When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, it is determined that the throttle valve 14 of the outdoor unit 10 that has not been operated fails.

The valve body failure detection method of the air-conditioning system 100 according to the embodiment of the present application can determine the unoperated outdoor unit 10 according to the absolute value of the difference between the coil temperature of the heat exchanger 12 of the unoperated outdoor unit 10 and the outdoor ambient temperature Whether the throttle valve 14 fails, thereby ensuring the reliability of the air conditioning system 100.

The air-conditioning system 100 of the embodiment of the present application may form a multi-line system. The multi-line system means that at least one outdoor unit 10 is connected to two or more indoor units 20 through piping. In the present application, the air-conditioning system 100 includes at least two outdoor units 10. The multi-connection system can be a two-control multi-connection system or a three-control heat recovery multi-connection system. In the example of FIG. 2, the air-conditioning system 100 is a two-control parallel multi-connection system.

It can be understood that, in the air-conditioning system 100 in which at least two outdoor units 10 are connected in parallel, when the indoor unit 20 side needs to be large, all the outdoor units 10 operate at the same time; when the indoor unit 20 side needs to be small, it is not necessary to turn on all For the outdoor unit 10, at least two outdoor units 10 can be operated in rotation. When the throttle valve 14 of the non-operating outdoor unit 10 fails, in the pure heating mode, it will cause the low-pressure low-temperature refrigerant to bypass the heat exchanger 12 of the outdoor unit 10; in the pure cooling mode, it will cause The cold coal in the cold state is bypassed into the heat exchanger 12 of the outdoor unit 10. Both of these situations will affect the performance of the air conditioning system 100. Therefore, in the present application, it is determined whether the throttle valve 14 has failed by the absolute value of the difference between the coil temperature of the heat exchanger 12 of the outdoor unit 10 and the outdoor ambient temperature. When the throttle valve 14 of the outdoor unit 10 that is not in operation fails, maintenance can be performed to ensure that the air-conditioning system 100 operates normally.

Normally, the four-way valve 18 and the throttle valve 14 of the outdoor unit 10 that are not in operation are in a closed state. Therefore, before detecting whether the throttle valve 14 of the non-operating outdoor unit 10 fails, you can first determine whether the throttle valve 14 of the non-operating outdoor unit 10 has been adjusted to the minimum (that is, in the closed state) to improve the detection accuracy degree.

It should be noted that when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is not greater than the second threshold, it is determined that the throttle valve 14 of the outdoor unit 10 that is not operating is effective. The compressor superheat degree refers to the compressor superheat degree of exhaust, that is, the temperature difference between the exhaust temperature of the compressor exhaust pipe and the saturation temperature corresponding to the exhaust high pressure. The failure of the throttle valve 14 means that the throttle valve 14 loses effective control. The throttle valve 14 is effective means that the throttle valve 14 can be effectively controlled.

Referring to FIG. 3, in some embodiments, step S10 includes step S12: when the compressor superheat of the outdoor unit 10 in operation is less than the first threshold and lasts for the first duration, the replacement of the outdoor unit 10 that is not in operation is acquired. The coil temperature of the heater 12.

It can be understood that, during the first period of time, the compressor superheat of the outdoor unit 10 in operation has remained less than the first threshold value, indicating that the throttle valve 14 of the outdoor unit 10 that is not in operation is more likely to fail. In this way, the accuracy of valve body failure detection can be improved. In one example, the first threshold is 4-6°C, preferably, the first threshold is 5°C. The first duration is 3-7 minutes, preferably, the first duration is 5 minutes.

It should be noted that when there is more than one outdoor unit 10 in operation, the minimum compressor superheat is selected and compared with the first threshold to save time.

In some embodiments, the outdoor unit 10 includes at least one heat exchanger 12, and each heat exchanger 12 is connected with a throttle valve 14. Step S10 includes: when the compressor superheat of the outdoor unit 10 in operation is less than the first threshold, acquiring coil temperatures of all the heat exchangers 12 of the same outdoor unit 10 that is not in operation. Step S20 includes determining one by one whether the absolute value of the difference between the coil temperature of each heat exchanger 12 and the outdoor ambient temperature is greater than the second threshold.

It can be understood that the outdoor unit 10 may include one heat exchanger 12, two heat exchangers 12, or more than two heat exchangers 12. Each heat exchanger 12 is connected with a throttle valve 14. It is assumed that in the air conditioning system 100, the outdoor unit 10 includes two or more heat exchangers 12, and there are two outdoor units 10 that are not in operation, and the valve body failure detection needs to be performed separately. For example, after the detection of one non-operational outdoor unit 10 is completed, another non-operational outdoor unit 10 is detected.

When the compressor superheat of the outdoor unit 10 in operation is less than the first threshold, obtain the coil temperatures of all the heat exchangers 12 of one of the outdoor units 10 that are not in operation, and then determine the temperature of each heat exchanger 12 one by one. Whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold. When it is determined that the absolute value of the difference between the temperature of one of the coils and the outdoor ambient temperature is greater than the second threshold, it may be determined that the throttle valve 14 of the outdoor unit 10 that has not been operated fails to terminate the detection. Of course, after determining that a certain throttle valve 14 has failed, it may continue to determine whether other throttle valves 14 have failed until all the throttle valves 14 have been confirmed. In this way, it can be determined which throttle valve 14 fails, which is convenient for maintenance.

It should be noted that the number of coil temperatures acquired does not necessarily correspond to the number of heat exchangers 12. That is to say, the number of coil temperatures acquired may be the same as the number of heat exchangers 12, or the number of coil temperatures acquired may be less than the number of heat exchangers 12.

In other embodiments, step S20 includes: selecting one of the coil temperatures of all the heat exchangers 12 according to preset conditions and determining whether the absolute value of the difference between the selected coil temperature and the outdoor ambient temperature is greater than The second threshold. The preset condition is the minimum coil temperature among the coil temperatures of all heat exchangers 12 of the same outdoor unit 10 that is not in operation.

It can be understood that comparing the absolute value of the difference between the minimum coil temperature and the outdoor ambient temperature of the coil temperature of all the heat exchangers 12 of the same outdoor unit 10 that is not in operation directly and the second threshold value can save the detection time, It is quickly determined whether the throttle valve 14 of the outdoor unit 10 that is not in operation has failed. If the absolute value of the difference between the minimum coil temperature and the outdoor environment temperature is not greater than the second threshold, it means that the absolute value of the difference between the temperature of the other coils and the outdoor environment temperature is also not greater than the second threshold. If the absolute value of the difference between the minimum coil temperature and the outdoor ambient temperature is greater than the second threshold, it is determined that the throttle valve 14 has failed in the outdoor unit 10 that is not operating.

Referring to FIG. 4, in some embodiments, step S30 includes step S32: when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold value and continues for the second duration, it is determined that the outdoor unit 10 is not in operation. The throttle valve 14 has failed.

It can be understood that, during the second time period, the absolute value of the difference between the coil temperature and the outdoor ambient temperature has always remained greater than the first threshold, indicating that the throttle valve 14 of the outdoor unit 10 that is not in operation is more likely to fail. In this way, the accuracy of valve body failure detection can be improved.

In some embodiments, the second threshold includes a first sub-threshold and a second sub-threshold, the first sub-threshold is greater than the second sub-threshold. Referring to FIG. 5, step S32 includes step S322: In the pure heating mode, when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the first sub-threshold value and continues for the second duration, it is determined that the outdoor unit 10 is not in operation Throttle valve 14 fails. Referring to FIG. 6, step S32 includes step S324: In the pure cooling mode, when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second sub-threshold value and continues for the second duration, it is determined that the outdoor unit 10 is not in operation. The throttle valve 14 has failed.

In one example, the first sub-threshold value is 28-32°C, preferably, the first sub-threshold value is 30°C. The second sub-threshold value is 8-12°C, preferably, the second sub-threshold value is 10°C. The second duration is 15-25 minutes, preferably, the second duration is 20 minutes. The pure heating mode means that all indoor units 20 are used for heating. The pure cooling mode means that all indoor units 20 are used for cooling.

In some embodiments, the detection method includes: after judging that the throttle valve 14 of the outdoor unit 10 that has not been operated fails, prompting the valve body to malfunction.

In this way, the user is reminded that the valve body is faulty and the specific cause of the fault can be investigated and repaired. The user can be prompted to play the voice "valve body failure" through the speaker. Or you can use a buzzer to sound a special sound to remind the user.

In a specific embodiment, at least two outdoor units 10 of the air conditioning system 100 operate in rotation. The outdoor unit 10 includes a heat exchanger 12 and a throttle valve 14 connected to the heat exchanger 12. Referring to FIG. 7, when the air-conditioning system 100 is in the pure heating mode, first execute step S12: when the compressor superheat of the outdoor unit 10 in operation is less than the first threshold value and lasts for the first duration, obtain the outdoor unit that is not in operation The coil temperature of the heat exchanger 12 of 10; then perform step S20: determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold; then perform step S322: the difference between the coil temperature and the outdoor ambient temperature When the absolute value of the value is greater than the first sub-threshold value and continues for the second duration, it is determined that the throttle valve 14 of the outdoor unit 10 that is not in operation is invalid. Referring to FIG. 8, when the air-conditioning system 100 is in the pure cooling mode, step S12 is first performed: when the compressor superheat of the outdoor unit 10 in operation is less than the first threshold and lasts for the first duration, the outdoor unit 10 that is not in operation is acquired The coil temperature of the heat exchanger 12 of the heat exchanger; then perform step S20: determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold; then perform step S324: the difference between the coil temperature and the outdoor ambient temperature When the absolute value is greater than the second sub-threshold value and continues for the second duration, it is determined that the throttle valve 14 of the outdoor unit 10 that has not been operated fails.

Referring to FIG. 2, the air-conditioning system 100 according to the embodiment of the present application. The air-conditioning system 100 includes at least two outdoor units 10 and a controller 30. The outdoor unit 10 includes a heat exchanger 12 and a throttle valve 14 connected to the heat exchanger 12. The controller 30 is used to obtain the coil temperature of the heat exchanger 12 of the outdoor unit 10 that is not in operation when the compressor superheat of the outdoor unit 10 in operation is less than the first threshold, and to determine the coil temperature and the outdoor environment Whether the absolute value of the temperature difference is greater than the second threshold, and when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, it is determined that the throttle valve 14 of the outdoor unit 10 that is not operating is ineffective.

That is to say, step S10, step S20, and step S30 of the valve body failure detection method of the air conditioning system 100 described above can be implemented by the controller 30. The controller 30 may be installed in one of the outdoor units 10 or in one of the indoor units 20.

The air-conditioning system 100 according to the embodiment of the present application can determine whether the throttle valve 14 of the unoperated outdoor unit 10 is based on the absolute value of the difference between the coil temperature of the heat exchanger 12 of the unoperated outdoor unit 10 and the outdoor ambient temperature Failure, thereby ensuring the reliability of the air conditioning system 100.

It should be noted that the explanations and beneficial effects of the valve body failure detection method of the air-conditioning system 100 of the above embodiment are also applicable to the air-conditioning system 100 of this embodiment, and to avoid redundancy, they will not be described in detail here.

In some embodiments, the controller 30 is used to obtain the coil of the heat exchanger 12 of the outdoor unit 10 that is not in operation when the superheat of the compressor of the outdoor unit 10 is less than the first threshold value and lasts for the first duration. temperature.

That is to say, step S12 of the valve body failure detection method of the air conditioning system 100 described above can be implemented by the controller 30.

In some embodiments, the outdoor unit 10 includes at least one heat exchanger 12, and each heat exchanger 12 is connected with a throttle valve 14. The controller 30 is used to obtain the coil temperature of all the heat exchangers 12 of the same outdoor unit 10 when the compressor superheat of the outdoor unit 10 in operation is less than the first threshold. The controller 30 is used to determine one by one whether the absolute value of the difference between the coil temperature of each heat exchanger 12 and the outdoor ambient temperature is greater than the second threshold, or to determine the temperature of the coils of all the heat exchangers 12 according to preset conditions Select one of the coil temperatures and determine whether the absolute value of the difference between the selected coil temperature and the outdoor ambient temperature is greater than the second threshold.

In some embodiments, the preset condition is a minimum coil temperature among coil temperatures of all heat exchangers 12 of the same outdoor unit 10 that is not in operation.

In some embodiments, the controller 30 is configured to determine that the throttle valve 14 of the outdoor unit 10 that has not been operated fails when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold for a second duration.

That is to say, step S32 of the valve body failure detection method of the air-conditioning system 100 described above can be implemented by the controller 30.

In some embodiments, the second threshold includes the first sub-threshold. In the pure heating mode, the controller 30 is used to determine that the throttle valve 14 of the outdoor unit 10 that has not been operated fails when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the first sub-threshold value for a second duration .

That is to say, step S322 of the above-mentioned valve body failure detection method of the air-conditioning system 100 can be implemented by the controller 30.

In some embodiments, the second threshold includes a second sub-threshold. In the pure cooling mode, the controller 30 is used to determine that the throttle valve 14 of the outdoor unit 10 that has not been operated fails when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second sub-threshold value for a second duration.

That is to say, step S324 of the valve body failure detection method of the air conditioning system 100 described above can be implemented by the controller 30.

In some embodiments, the controller 30 is used to determine that the throttle valve 14 of the outdoor unit 10 that is not operating is effective when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is not greater than the second threshold.

In some embodiments, the controller 30 is used to notify the valve body of a failure after determining that the throttle valve 14 of the outdoor unit 10 that is not in operation has failed.

In the description of this specification, reference to descriptions of the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples" or "some examples", etc. is meant to be combined with the implementation The specific features, structures, materials, or characteristics described in the modes or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method description in a flowchart or otherwise described herein may be understood as representing a module, segment, or portion of code that includes one or more executable instructions for implementing specific logical functions or steps of a process , And the scope of the preferred embodiments of the present application includes additional implementations, in which the functions shown may not be in the order shown or discussed, including performing the functions in a substantially simultaneous manner or in reverse order according to the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present application belong.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, can be regarded as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium, For use by or in combination with instruction execution systems, devices or equipment (such as computer-based systems, systems including processing modules, or other systems that can fetch and execute instructions from instruction execution systems, devices or equipment) Or equipment. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples of computer-readable media (non-exhaustive list) include the following: electrical connections (electronic devices) with one or more wires, portable computer cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable and editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, because, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or other appropriate if necessary Process to obtain the program electronically and then store it in computer memory.

It should be understood that each part of the embodiments of the present application may be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods may 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: a logic gate circuit for implementing a logic function on a data signal Discrete logic circuits, dedicated integrated circuits with appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

A person of ordinary skill in the art can understand that all or part of the steps carried in the method of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When executed, it includes one of the steps of the method embodiment or a combination thereof.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or software function modules. If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be construed as limitations to the present application. Those of ordinary skill in the art can The embodiments are changed, modified, replaced, and modified.

Claims

A valve body failure detection method for an air conditioning system, characterized in that the air conditioning system includes at least two outdoor units, the outdoor unit includes a heat exchanger and a throttle valve connected to the heat exchanger, the detection Methods include:

When the compressor superheat of the outdoor unit in operation is less than the first threshold, obtain the coil temperature of the heat exchanger of the outdoor unit that is not in operation;

Determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold;

When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, it is determined that the throttle valve of the outdoor unit that has not been operated fails.
The detection method according to claim 1, wherein when the compressor superheat of the outdoor unit in operation is less than a first threshold, the coil temperature of the heat exchanger of the outdoor unit that is not in operation is acquired, include:

When the compressor superheat of the outdoor unit in operation is less than the first threshold value and lasts for a first period of time, the coil temperature of the heat exchanger of the outdoor unit that is not in operation is acquired.
The detection method according to claim 1, wherein when the compressor superheat of the outdoor unit in operation is less than a first threshold, the coil temperature of the heat exchanger of the outdoor unit that is not in operation is acquired, include:

When the outdoor unit in operation includes at least two and the minimum compressor superheat of the outdoor unit in operation is less than the first threshold, obtain the coil temperature of the heat exchanger of the outdoor unit that is not in operation .
The detection method according to claim 1, wherein the outdoor unit includes at least one of the heat exchangers, each of the heat exchangers is connected to the throttle valve, and the outdoor When the compressor superheat is less than the first threshold, obtaining the coil temperature of the heat exchanger of the outdoor unit that is not in operation includes:

When the compressor superheat of the outdoor unit in operation is less than the first threshold, obtain coil temperatures of all the heat exchangers of the same outdoor unit that are not in operation;

Determine whether the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, including one of the following:

Determine one by one whether the absolute value of the difference between the coil temperature of each heat exchanger and the outdoor ambient temperature is greater than the second threshold;

According to the preset conditions, select one of the coil temperatures of all the heat exchangers and determine whether the absolute value of the difference between the selected coil temperature and the outdoor ambient temperature is greater than the first Two thresholds.
The detection method according to claim 4, wherein the preset condition is a minimum coil temperature among coil temperatures of all the heat exchangers of the same outdoor unit that is not in operation.
The detection method according to claim 1, wherein when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, it is determined that the throttle of the outdoor unit that is not in operation Valve failure, including:

When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold value for a second duration, it is determined that the throttle valve of the outdoor unit that has not been operated fails.
The detection method according to claim 6, wherein the second threshold includes a first sub-threshold, and the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold and continues During the second period of time, it is determined that the throttle valve of the outdoor unit that has not been operated fails, including:

In the pure heating mode, when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the first sub-threshold value and continues for the second duration, it is determined that the outdoor unit is not operating. The throttle valve fails.
The detection method according to claim 6, wherein the second threshold includes a second sub-threshold, and the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold and continues During the second period of time, it is determined that the throttle valve of the outdoor unit that has not been operated fails, including:

In the pure cooling mode, when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second sub-threshold value and continues for the second duration, it is determined that the outdoor unit is not in operation. Throttle valve failure.
The detection method according to claim 1, wherein the detection method comprises:

When the absolute value of the difference between the coil temperature and the outdoor ambient temperature is not greater than the second threshold, it is determined that the throttle valve of the outdoor unit that is not operating is effective.
The detection method according to claim 1, wherein the detection method comprises:

After it is determined that the throttle valve of the outdoor unit that has not been operated fails, a valve body failure is prompted.
An air conditioning system, characterized in that the air conditioning system includes at least two outdoor units and a controller, the outdoor unit includes a heat exchanger and a throttle valve connected to the heat exchanger;

The controller is used to obtain the coil temperature of the heat exchanger of the outdoor unit that is not in operation when the compressor superheat of the outdoor unit in operation is less than the first threshold, and to determine the coil temperature Whether the absolute value of the difference from the outdoor ambient temperature is greater than the second threshold, and when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold, determining whether the outdoor unit is not operating The throttle valve fails.
The air-conditioning system according to claim 11, wherein the controller is used to obtain an unoperated air conditioner when the compressor superheat of the outdoor unit is less than the first threshold for a first duration Describe the coil temperature of the heat exchanger of the outdoor unit.
The air-conditioning system according to claim 11, wherein the controller is used for at least two of the outdoor units in operation and the minimum compressor superheat of the outdoor unit in operation is less than the first At the threshold, the coil temperature of the heat exchanger of the outdoor unit that is not in operation is obtained.
The air conditioning system of claim 11, wherein the outdoor unit includes at least one of the heat exchangers, each of the heat exchangers is connected to the throttle valve, and the controller is used to operate When the compressor superheat of the outdoor unit is less than the first threshold, the coil temperatures of all the heat exchangers of the same unoperated outdoor unit are obtained, and the controller is used to determine each one Whether the absolute value of the difference between the coil temperature of the heat exchanger and the outdoor ambient temperature is greater than the second threshold, or used to select among the coil temperatures of all the heat exchangers according to preset conditions One of the coil temperatures and determines whether the absolute value of the difference between the selected coil temperature and the outdoor ambient temperature is greater than the second threshold.
The air-conditioning system according to claim 14, wherein the preset condition is a minimum coil temperature among coil temperatures of all the heat exchangers of the same unoperated outdoor unit.
The air-conditioning system of claim 11, wherein the controller is configured to determine when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is greater than the second threshold for a second duration The throttle valve of the outdoor unit that is not operating fails.
The air-conditioning system according to claim 16, wherein the second threshold includes a first sub-threshold, and in the pure heating mode, the controller is used to determine the temperature between the coil temperature and the outdoor ambient temperature. When the absolute value of the difference is greater than the first sub-threshold value and continues for the second duration, it is determined that the throttle valve of the outdoor unit that has not been operated fails.
The air-conditioning system according to claim 16, wherein the second threshold includes a second sub-threshold, and in the pure cooling mode, the controller is used to determine the difference between the coil temperature and the outdoor ambient temperature When the absolute value of the value is greater than the second sub-threshold value and continues for the second duration, it is determined that the throttle valve of the outdoor unit that has not been operated fails.
The air-conditioning system according to claim 11, wherein the controller is configured to determine that the outdoor is not in operation when the absolute value of the difference between the coil temperature and the outdoor ambient temperature is not greater than the second threshold The throttle of the machine is effective.
The air-conditioning system according to claim 11, wherein the controller is used for prompting a valve body failure after it is determined that the throttle valve of the outdoor unit that has not been operated fails.