CN111503948A - Multi-split air conditioning system, method and device for detecting leakage of refrigeration valve of multi-split air conditioning system and storage medium - Google Patents
Multi-split air conditioning system, method and device for detecting leakage of refrigeration valve of multi-split air conditioning system and storage medium Download PDFInfo
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- CN111503948A CN111503948A CN202010357458.8A CN202010357458A CN111503948A CN 111503948 A CN111503948 A CN 111503948A CN 202010357458 A CN202010357458 A CN 202010357458A CN 111503948 A CN111503948 A CN 111503948A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention discloses a multi-split system and a method, a device and a storage medium for detecting leakage of a refrigerating valve thereof, wherein the method comprises the following steps: when a refrigerating valve leakage detection instruction is acquired, controlling a multi-split system to enter a refrigerating valve test mode; after the first preset duration, acquiring a first operating parameter of the multi-split system; closing a refrigerating valve of the target indoor unit; after a second preset time length, acquiring a second operation parameter of the multi-split system; and determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter. According to the method, whether the leakage fault exists in the refrigerating valve can be effectively detected according to the return air pressure of the compressor before and after the refrigerating valve of the target indoor unit of the multi-split system in the refrigerating operation mode is closed or the temperature of the refrigerant inlet of the target indoor unit, so that the refrigerant on the side of the indoor unit is cut off through the refrigerating valve when the refrigerant leaks from the target indoor unit, and potential safety hazards caused by overhigh refrigerant content are avoided.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a multi-split air conditioner system, a method and a device for detecting leakage of a refrigerating valve of the multi-split air conditioner system, and a storage medium.
Background
The multi-split air conditioner system belongs to a refrigerant direct expansion system, pipelines are long, the number of connected inner machines is large, the whole system is filled with refrigerants, the refrigerant leakage of the inner machines in a refrigeration operation mode can enable the content of the refrigerants in indoor air to be seriously exceeded, and potential safety hazards are caused to indoor users. Therefore, for safety, the refrigerant concentration in the space where the internal unit is located cannot exceed a certain value, so that the refrigerant in the system is cut off by the refrigeration valve of the switching device when the refrigerant leaks, and the leakage amount of the refrigerant is reduced in the related art.
However, in the above-described technical solution, there may be a leakage failure of the refrigerant valve, that is, the refrigerant valve has poor sealing performance and cannot be closed tightly, and therefore, it is not possible to ensure whether or not the refrigerant valve can completely block the flow of the refrigerant when the refrigerant leaks from the system, which may cause a failure in the refrigerant leakage protection.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a method for detecting leakage of a refrigeration valve of a multi-split system, which can effectively detect whether a leakage fault exists in the refrigeration valve according to return air pressure of a compressor before and after the refrigeration valve of a target indoor unit of the multi-split system in a refrigeration operation mode is closed or temperature of a refrigerant inlet of the target indoor unit, so as to cut off an indoor unit side refrigerant through the refrigeration valve when the target indoor unit has refrigerant leakage, thereby avoiding potential safety hazards caused by excessive refrigerant content.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a leakage detection device for a refrigeration valve of a multi-split system.
A fourth object of the present invention is to provide a multi-split system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for detecting leakage of a refrigeration valve of a multi-split system, including: when a leakage detection instruction of a refrigerating valve is obtained, controlling the multi-split air conditioner system to enter a refrigerating valve test mode, wherein the refrigerating valve test mode refers to that one indoor unit in the multi-split air conditioner system is in a refrigerating operation mode and the other indoor units are in a standby mode; after a first preset time, acquiring a first operation parameter of the multi-split system, wherein the first operation parameter comprises any one of the following parameters: the method comprises the following steps that a first back pressure of a compressor and a first temperature at a refrigerant inlet of a target indoor unit in a refrigeration running mode are set; closing a refrigeration valve of the target indoor unit; after a second preset time, acquiring a second operation parameter of the multi-split system, wherein the second operation parameter comprises any one of the following parameters: a second return air pressure of the compressor and a second temperature at a refrigerant inlet of the target indoor unit, wherein the second operation parameter is the same as the first operation parameter in parameter type; and determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter.
According to the method for detecting the leakage of the refrigeration valve of the multi-split system, firstly, the multi-split system is controlled to enter a refrigeration valve test mode when a refrigeration valve leakage detection instruction is obtained, then, after a first preset time, acquiring a first operation parameter of the multi-split air-conditioning system, wherein the first operation parameter comprises any one of a first back pressure of the compressor and a first temperature at a refrigerant inlet of a target indoor unit in a refrigeration operation mode, then closing a refrigeration valve of the target indoor unit, and after a second preset time, acquiring a second operation parameter of the multi-split air conditioning system, wherein the second operation parameter comprises any one of a second return air pressure of the compressor and a second temperature at a refrigerant inlet of the target indoor unit, and the second operation parameter is the same as the first operation parameter in type, and finally, whether the leakage fault exists in the refrigeration valve of the target indoor unit is determined according to the first operation parameter and the second operation parameter. Therefore, according to the method, whether leakage faults exist in the refrigerating valve can be effectively detected according to the return air pressure of the compressor before and after the refrigerating valve of the target indoor unit in the refrigerating operation mode of the multi-split system is closed or the temperature of the inlet of the refrigerant of the target indoor unit, so that the refrigerant on the side of the indoor unit is cut off through the refrigerating valve when the refrigerant leaks from the target indoor unit, and potential safety hazards caused by overhigh refrigerant content are avoided.
In addition, the method for detecting leakage of a refrigeration valve of a multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the first operating parameter is a first return pressure of the compressor and the second operating parameter is a second return pressure of the compressor; the determining whether a leakage fault exists in a refrigeration valve corresponding to the target indoor unit according to the first operating parameter and the second operating parameter includes: if the difference value between the second return air pressure and the first return air pressure is larger than or equal to a first pressure threshold value, determining that a refrigerating valve of the target indoor unit has no leakage fault; or if the second return air pressure is smaller than or equal to a second pressure threshold, determining that a refrigeration valve of the target indoor unit has no leakage fault; or if the system has low-pressure protection, determining that the refrigerating valve of the target indoor unit has no leakage fault.
According to an embodiment of the present invention, the first operating parameter is a first temperature at the target indoor unit refrigerant inlet, and the second operating parameter is a second temperature at the target indoor unit refrigerant inlet; the determining whether the leakage fault exists in the refrigeration valve of the target indoor unit according to the first operating parameter and the second operating parameter comprises the following steps: and if the difference value between the first temperature and the second temperature is smaller than or equal to a first temperature threshold value, determining that the leakage fault exists in the refrigerating valve of the target indoor unit.
According to an embodiment of the present invention, before determining that there is a leakage fault in the refrigerant valve of the target indoor unit, the method further includes: and determining that the difference value between the second temperature and the temperature of the environment where the target indoor unit is located is greater than or equal to a second temperature threshold value.
According to an embodiment of the invention, after the controlling the multi-split system to enter the refrigeration valve test mode, the method further includes: determining the capacity of a target indoor unit currently in a cooling operation mode; and determining the first preset time and the second preset time according to the capacity of the target indoor unit.
In order to achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for detecting a leakage of a refrigeration valve of a multi-split system according to the first embodiment of the present invention.
The computer readable storage medium of the embodiment of the invention can effectively detect whether the leakage fault exists in the refrigerating valve when the computer program stored on the computer readable storage medium is executed by the processor, so that the refrigerant on the side of the target indoor unit is cut off by the refrigerating valve when the refrigerant leaks, and the potential safety hazard caused by overhigh refrigerant content is avoided.
In order to achieve the above object, a third aspect of the present invention provides a leakage detection apparatus for a refrigeration valve of a multi-split system, including: the first obtaining module is configured to obtain a first operating parameter of the multi-split air-conditioning system after a first preset time period, where the first operating parameter includes any one of the following parameters: the method comprises the following steps that a first back pressure of a compressor and a first temperature at a refrigerant inlet of a target indoor unit in a refrigeration running mode are set; the second obtaining module is configured to obtain a second operation parameter of the multi-split system after a second preset time period, where the second operation parameter includes any one of the following parameters: a second return air pressure of the compressor and a second temperature at a refrigerant inlet of the target indoor unit, wherein the second operation parameter is the same as the first operation parameter in parameter type; the control module is used for controlling the multi-split air conditioner system to enter a refrigerating valve test mode when a refrigerating valve leakage detection instruction is obtained, wherein the refrigerating valve test mode refers to that one indoor unit in the multi-split air conditioner system is in a refrigerating operation mode and the other indoor units are in a standby mode; a refrigeration valve for closing the target indoor unit; and the system is used for determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter.
According to the leakage detection device for the refrigeration valve of the multi-split system, the first operation parameter of the multi-split system is obtained through the first obtaining module after the first preset time, the first operation parameter comprises any one of the first return pressure of the compressor and the first temperature of the target indoor unit refrigerant inlet in the refrigeration operation mode, the second operation parameter of the multi-split system is obtained through the second obtaining module after the second preset time, the second operation parameter comprises any one of the second return pressure of the compressor and the second temperature of the target indoor unit refrigerant inlet, the second operation parameter is the same as the first operation parameter in type, the multi-split system is controlled to enter the refrigeration valve test mode through the control module when the leakage detection instruction of the refrigeration valve is obtained, the refrigeration valve of the target indoor unit is closed through the control module, and the control module controls the multi-split system to enter the refrigeration valve test mode according to the first operation parameter and the second operation parameter, it is determined whether there is a leakage failure in the refrigerant valve of the target indoor unit. Therefore, the device can effectively detect whether the leakage fault exists in the refrigerating valve according to the return air pressure of the compressor before and after the refrigerating valve of the target indoor unit in the refrigerating operation mode of the multi-split system is closed or the temperature of the refrigerant inlet of the target indoor unit, so that the refrigerant on the side of the indoor unit is cut off through the refrigerating valve when the refrigerant leakage occurs in the target indoor unit, and the potential safety hazard caused by overhigh refrigerant content is avoided.
In order to achieve the above object, a fourth aspect of the present invention provides a multi-split system, including a leakage detection apparatus for a refrigeration valve of the multi-split system according to the third aspect of the present invention.
According to the multi-split system provided by the embodiment of the invention, through the leakage detection device for the refrigerating valve of the multi-split system provided by the embodiment of the invention, whether the refrigerating valve has a leakage fault can be effectively detected according to the return air pressure of the compressor before and after the refrigerating valve of the target indoor unit in the refrigerating operation mode is closed or the temperature of the refrigerant inlet of the target indoor unit, so that the refrigerant on the indoor unit side is cut off through the refrigerating valve when the target indoor unit has refrigerant leakage, and the potential safety hazard caused by overhigh refrigerant content is avoided.
Drawings
Fig. 1 is a schematic connection diagram of a multi-split system according to an embodiment of the present invention;
fig. 2 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention;
fig. 3 is a flowchart of a leakage detection method of a refrigerant valve of a multi-split system according to an embodiment of the present invention;
fig. 4 is a flowchart of a leakage detection method of a refrigerant valve of a multi-split system according to an example of the present invention;
fig. 5 is a flowchart of a leakage detection method of a refrigerant valve of a multi-split system according to another example of the present invention;
fig. 6 is a block diagram illustrating a leakage detecting apparatus of a refrigerant valve of a multi-split system according to an embodiment of the present invention;
fig. 7 is a block diagram of a multi-split system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A multi-split system, a method and an apparatus for detecting leakage of a refrigerant valve thereof, and a storage medium according to embodiments of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic connection diagram of a multi-split system according to an embodiment of the present invention, and fig. 2 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention. As shown in fig. 1, the multi-split air conditioner system includes an outdoor unit, at least two indoor units (in the figure, 1# indoor unit and 2# indoor unit are shown), and switching devices (in the figure, 1# switching device corresponding to 1# indoor unit and 2# switching device corresponding to 2# indoor unit) provided in one-to-one correspondence with the indoor units. As shown in fig. 2, the outdoor unit includes a compressor, a gas-liquid separator, a four-way valve, an outdoor unit heat exchanger, a fan, and a throttle valve; each switching device comprises a refrigeration valve arranged on the low-pressure air pipe, a heating valve arranged on the high-pressure air pipe and a liquid valve arranged on the high-pressure liquid pipe; the indoor unit comprises a refrigerant control valve and an indoor unit heat exchanger.
It should be understood that, in this embodiment, taking the # 1 internal unit as an example, when the # 1 internal unit is in the cooling operation mode, the cooling valve and the liquid valve corresponding to the # 1 internal unit may be controlled to be opened, and the heating valve may be controlled to be closed, so that the liquid pipe of the # 1 internal unit is communicated with the liquid pipe of the refrigerant system, and the gas pipe of the # 1 internal unit is communicated with the low-pressure gas pipe of the refrigerant system; when the air pipe is in a heating running mode, the heating valve and the liquid valve corresponding to the air pipe can be controlled to be opened, and the refrigerating valve is controlled to be closed, so that the liquid pipe of the 1# indoor unit is communicated with the liquid pipe of the refrigerant system, and the air pipe of the 1# indoor unit is communicated with the high-pressure air pipe of the refrigerant system. Therefore, the indoor unit can be controlled to operate in a cooling operation mode or a heating operation mode by controlling the opening and closing of the cooling valve, the heating valve and the liquid valve of the switching device corresponding to the indoor unit.
It should be noted that the multi-split system belongs to a refrigerant direct expansion system, the pipeline is long, the number of connected indoor units is large, the whole system is full of the refrigerant, and the refrigerant leakage of the indoor unit in the refrigeration operation mode can cause the refrigerant content in the indoor air to be seriously exceeded, thereby causing potential safety hazards to indoor users. Therefore, for the sake of safety, the refrigerant concentration in the space where the internal unit is located cannot exceed a certain value, and therefore, the refrigerant in the system needs to be cut off when the refrigerant in the internal unit leaks, so as to prevent the continuous leakage of the refrigerant in the internal unit caused by the continuous flow of the refrigerant in the system to the internal unit, thereby realizing the refrigerant leakage protection and reducing the refrigerant leakage amount. The precondition for achieving this is that the device that shuts off the refrigerant (the refrigeration valve of the switching device) must be able to be closed tightly without leakage. Therefore, it is very necessary to perform a tightness detection on the refrigeration valve in the switching device before starting the refrigerant leakage protection, so as to ensure that the refrigerant in the system can be effectively cut off when the refrigerant leaks, and therefore, the invention provides a method for detecting the tightness of the refrigeration valve in a multi-split system.
Fig. 3 is a flowchart of a leakage detection method for a refrigeration valve of a multi-split system according to an embodiment of the present invention. As shown in fig. 3, the method comprises the steps of:
and S1, when a leakage detection instruction of the refrigerating valve is obtained, controlling the multi-split system to enter a refrigerating valve test mode, wherein the refrigerating valve test mode means that one indoor unit in the multi-split system is in a refrigerating operation mode and the other indoor units are in a standby mode.
Specifically, in the operation process of the multi-split air conditioner system, before the refrigerant of the indoor unit in the refrigeration operation mode leaks or when the refrigerant leaks, and before the refrigerant leakage protection work is started, a refrigerant valve leakage detection instruction can be obtained, wherein the refrigerant valve leakage detection instruction can be input by a user through a remote controller for controlling the multi-split air conditioner system, and can also be automatically sent by the system when the refrigerant of the indoor unit leaks or is about to leak; after the leakage instruction of the refrigeration valve is obtained, the control system enters a refrigeration valve test mode, that is, an internal machine (target internal machine) to be detected and the corresponding refrigeration valve thereof are started, and the compressor can be controlled to operate at a preset frequency (such as 30Hz), so that the system operates normally. The refrigeration valve leakage detection instruction can be a leakage detection instruction for one refrigeration valve, and at the moment, only an internal machine corresponding to the refrigeration valve needs to be started for subsequent detection; in this case, the plurality of refrigeration valves may be sorted according to actual conditions (for example, capacity and refrigerant leakage) of the plurality of internal machines corresponding to the plurality of refrigeration valves, and the plurality of refrigeration valves may be sequentially detected according to the sorting order.
It should be understood that, referring to fig. 2 (the direction of the arrow in the figure is the refrigerant flow direction), the system operates according to the following principle: high-temperature high-pressure gaseous refrigerant coming out of the compressor enters the outer machine heat exchanger through the four-way valve to be condensed, high-pressure liquid refrigerant after condensation is conveyed to the inner machine through a liquid pipe of the switching device, and the refrigerant is changed into low-temperature low-pressure refrigerant after throttling and pressure reduction through a refrigerant control valve of the inner machine to be evaporated in the inner machine heat exchanger, at the moment, the temperature of the refrigerant inlet of the inner machine is changed into the saturation temperature under the low-pressure saturation pressure, and the air return pressure of the compressor is within a.
S2, after a first preset time, acquiring a first operating parameter of the multi-split system, wherein the first operating parameter comprises any one of the following parameters: the first air return pressure of the compressor and the first temperature at the inlet of the target indoor unit refrigerant in the refrigeration running mode.
The first preset time length can be determined according to the actual conditions of the system (such as the capacity of the external unit and the target internal unit), and only the system is ensured to normally operate for a period of time and be in a stable state, so that the reliability and the accuracy of the acquired first operation parameter are ensured.
S3, the refrigerant valve of the target indoor unit is closed.
S4, after a second preset time, acquiring a second operation parameter of the multi-split system, wherein the second operation parameter comprises any one of the following parameters: and the second return air pressure of the compressor and the second temperature at the refrigerant inlet of the target indoor unit are the same as the type of the second operation parameter.
Specifically, if the first operating parameter acquired in step S2 is a first return pressure of the compressor, the second operating parameter acquirable in this step is a second return pressure of the compressor; if the first operating parameter obtained in step S2 is the first temperature at the target indoor refrigerant inlet, the second operating parameter obtainable in this step is the second temperature at the target indoor refrigerant inlet.
The second preset time period can be determined according to the actual conditions of the system (such as the capacity of the external unit and the target internal unit), and only the refrigeration valve is closed for a period of time and the system is in a stable state, so that the reliability and the accuracy of the obtained second operation parameter are ensured.
And S5, determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter.
Specifically, whether the refrigeration valve has the leakage fault is judged according to a first return pressure of the compressor and a second return pressure of the compressor, or whether the refrigeration valve has the leakage fault is judged according to a first temperature at a target indoor unit refrigerant inlet and a second temperature at the target indoor unit refrigerant inlet. That is, whether the leakage fault occurs in the refrigeration valve of the target indoor unit is judged according to the return air pressure of the compressor before and after the refrigeration valve is closed or the temperature at the refrigerant inlet of the target indoor unit.
It should be noted that, in this embodiment, if the refrigeration valve of the switching device is closed after the system operates stably, and the refrigerant flowing out of the target internal machine cannot flow to the air return side of the compressor, the air return pressure of the compressor becomes abnormally low, and the temperature at the refrigerant inlet of the target internal machine will rise to be close to the temperature of the environment where the target internal machine is located, so that it can be determined whether the refrigeration valve can be closed tightly by detecting the air return pressure of the compressor before and after the refrigeration valve is closed or the temperature at the refrigerant inlet of the target internal machine, so as to ensure whether the refrigerant circulation of the system can be blocked by closing the refrigeration valve when the target internal machine has refrigerant leakage, so as to facilitate the related refrigerant leakage protection work.
Therefore, according to the method, whether leakage faults exist in the refrigerating valve can be effectively detected according to the return air pressure of the compressor before and after the refrigerating valve of the target indoor unit in the refrigerating operation mode of the multi-split system is closed or the temperature of the inlet of the refrigerant of the target indoor unit, so that the refrigerant on the side of the indoor unit is cut off through the refrigerating valve when the refrigerant leaks from the target indoor unit, and potential safety hazards caused by overhigh refrigerant content are avoided.
In one embodiment of the invention, the first operating parameter is a first return pressure of the compressor and the second operating parameter is a second return pressure of the compressor; determining whether the refrigerant valve corresponding to the target internal machine has the leakage fault according to the first operating parameter and the second operating parameter, that is, step S5 may include: if the difference value between the second return air pressure and the first return air pressure is larger than or equal to the first pressure threshold value, determining that the refrigerating valve of the target indoor unit has no leakage fault; or if the second return air pressure is smaller than or equal to the second pressure threshold, determining that the refrigerating valve of the target indoor unit has no leakage fault; or if the system has low-pressure protection, determining that the refrigerating valve of the target indoor unit has no leakage fault.
Specifically, the return air of the compressor must pass through the refrigerating valve, after the refrigerating valve is closed, the return air end of the compressor is changed into an evacuation mode, the return air pressure is suddenly reduced, and even the low-pressure protection is performed due to the fact that the return air pressure is too low, so that whether the refrigerating valve can be closed tightly can be judged according to the change situation of the return air pressure of the compressor before and after the valve is closed.
Specifically, if the difference between the first return air pressure of the compressor before the refrigeration valve is closed and the second return air pressure of the compressor after the refrigeration valve is closed is greater than or equal to a first threshold value, that is, the difference is large, or the second return air pressure of the compressor after the refrigeration valve is closed is less than or equal to a second pressure threshold value, that is, the second return air pressure is small, or the multi-split system has low-pressure protection due to too low second return air pressure of the compressor, it is described that the return air pressure is reduced due to evacuation of the return air end of the compressor, and further, it is described that the refrigeration valve is closed tightly, and the refrigerant does not leak, so that it is determined that the refrigeration valve corresponding to the target indoor unit has no leakage fault, and effective closing and opening can be performed. Therefore, in the subsequent operation process, if the target indoor unit has refrigerant leakage, the refrigerating valve can be closed to block the flow of the refrigerant, so that the phenomenon that the content of the indoor refrigerant is continuously increased is avoided.
It can be understood that if the difference between the first return pressure of the compressor before the refrigeration valve is closed and the second return pressure of the compressor after the refrigeration valve is closed is smaller than the first threshold, that is, the difference is smaller, or the second return pressure of the compressor after the refrigeration valve is closed is greater than the second pressure threshold, that is, the second return pressure is larger, or the multi-split system does not generate low-pressure protection due to too low second return pressure of the compressor, it indicates that the return pressure is not significantly reduced because the return end of the compressor is not completely evacuated, and further indicates that the refrigeration valve is not closed tightly and refrigerant leakage has occurred, so that it is determined that the refrigeration valve has a leakage fault, and effective closing and opening cannot be performed. Therefore, if the target indoor unit has refrigerant leakage, it is not possible to rely entirely on the refrigerant leakage protection by closing the refrigerant valve.
In one example, as shown in fig. 4, the method for detecting leakage of a refrigerant valve of a multi-split system may include the steps of:
s401, when a refrigerating valve leakage detection instruction is obtained, the multi-split system is controlled to enter a refrigerating valve test mode, wherein the refrigerating valve test mode means that one indoor unit in the multi-split system is in a refrigerating operation mode, and the rest indoor units are in a standby mode.
S402, judging whether the system normally operates, and if so, executing a step S403; if not, step S404 is performed.
S403, after a first preset time period, obtaining a first back pressure of a compressor of the multi-split system, and then executing step S405.
S404, the detection fails and quits.
And S405, closing the refrigerating valve of the target indoor unit.
S406, after a second preset time period, obtaining a second return air pressure of the compressor of the multi-split system, and then executing step S407.
S407, judging whether the difference value between the second return air pressure and the first return air pressure is greater than or equal to a first pressure threshold value, or whether the second return air pressure is less than or equal to a second pressure threshold value, or whether the system has low-pressure protection, and if so, executing the step S408; if not, step S409 is performed.
And S408, the refrigerating valve of the target indoor unit has no leakage fault.
And S409, the leakage fault exists in the refrigerating valve of the target indoor unit.
Therefore, whether the leakage fault exists in the refrigerating valve is judged according to the change condition of the return air pressure of the compressor before and after the refrigerating valve is closed, so that the refrigerant on the side of the target indoor unit is cut off in time when the refrigerant leaks, and the safety problem caused by the excessive content of the refrigerant in the space where the target indoor unit is located is avoided.
In another embodiment of the present invention, the first operation parameter is a first temperature at the refrigerant inlet of the target indoor unit, and the second operation parameter is a second temperature at the refrigerant inlet of the target indoor unit; determining whether the refrigerant valve of the target indoor unit has the leakage fault according to the first operating parameter and the second operating parameter, that is, step S5, may include: and if the difference value between the first temperature and the second temperature is smaller than or equal to the first temperature threshold value, determining that the leakage fault exists in the refrigeration valve of the target indoor unit.
Further, before determining that the leakage fault exists in the refrigeration valve of the target indoor unit, the method may further include: and determining that the difference value between the second temperature and the temperature of the environment where the target indoor unit is located is greater than or equal to a second temperature threshold value.
Specifically, before the refrigeration valve is closed, the target indoor unit can continuously obtain the liquid refrigerant flowing out of the outdoor unit heat exchanger, the indoor unit heat exchanger maintains lower evaporation pressure, after the refrigeration valve is closed, if the refrigeration valve leaks, a large amount of refrigerant still enters the target indoor unit through the throttle valve to evaporate, the temperature of the refrigerant inlet of the target indoor unit cannot change rapidly, and the temperature cannot rise to be close to the temperature of the environment where the target indoor unit is located; if the refrigerating valve is not leaked, a large amount of refrigerant does not enter the target indoor unit through the throttle valve to be evaporated, and the temperature of the refrigerant inlet of the target indoor unit can be rapidly changed or increased to be close to the temperature of the environment where the target indoor unit is located. Therefore, whether the refrigerating valve can be closed tightly can be judged according to the temperature of the target indoor unit refrigerant inlet before and after closing the valve and the temperature degree close to the environment.
Specifically, if the difference between the first temperature and the second temperature is less than or equal to the first temperature threshold, it indicates that the temperature change at the refrigerant inlet of the target indoor unit before and after the refrigerant valve is closed is small (not too large), and the temperature at the refrigerant inlet does not change significantly, but the situation may be caused by the leakage of the refrigerant valve or may be caused by the slow temperature change (target indoor unit pressure change) at the refrigerant inlet of the target indoor unit, so as to prevent the misjudgment caused by the slow temperature change at the refrigerant inlet, it may be further determined whether the difference between the second temperature and the temperature of the environment where the target indoor unit is located is greater than or equal to the second temperature threshold, and if so, it indicates that the difference between the temperature at the refrigerant inlet of the target indoor unit after the refrigerant valve is closed and the temperature of the environment where the target indoor unit is located is large, and the temperature at the refrigerant inlet does not change significantly due to the closing of the refrigerant valve, determining that a leakage fault exists in a refrigerating valve of the target indoor unit; if not, namely the difference between the temperature at the inlet of the target indoor unit refrigerant after the refrigerating valve is closed and the temperature of the environment where the target indoor unit refrigerant is located is small (almost large), the fact that the temperature at the inlet of the target indoor unit refrigerant does not change obviously is caused by slow pressure change of the target indoor unit is indicated, therefore, the second temperature can be recorded again after a period of time (enough change time of the temperature is ensured), and whether the refrigerating valve has the leakage fault or not is determined again according to the first temperature and the second temperature. Therefore, misjudgment caused by slow temperature change is prevented, and the detection accuracy is improved.
It can be understood that if the difference between the first temperature and the second temperature is greater than the first temperature threshold, that is, the temperature at the refrigerant inlet of the target indoor unit before and after the refrigeration valve is closed is relatively large (relatively large change is generated), the temperature at the refrigerant inlet is significantly changed, and further, if the difference between the second temperature and the temperature of the environment where the target indoor unit is located is less than the second temperature threshold, that is, the difference between the temperature at the refrigerant inlet of the target indoor unit after the refrigeration valve is closed and the temperature of the environment is relatively small, it is determined that the refrigeration valve of the target indoor unit has no leakage fault.
It should be understood that, in this embodiment, whether the leakage fault exists in the refrigeration valve may also be determined according to a change rate of the temperature at the refrigerant inlet of the target indoor unit before and after the refrigeration valve is closed, specifically, if the change rate is relatively large and the difference between the second temperature and the temperature of the environment where the target indoor unit is located is greater than or equal to the second temperature threshold, it is determined that the leakage fault does not exist in the refrigeration valve of the target indoor unit; and if the change rate is small and the difference value between the second temperature and the temperature of the environment where the target internal machine is located is smaller than a second temperature threshold value, indicating that the leakage fault exists in the refrigeration valve.
In one example, as shown in fig. 5, the method for detecting leakage of a refrigerant valve of a multi-split system may include the steps of:
s501, when a refrigerating valve leakage detection instruction is obtained, the multi-split system is controlled to enter a refrigerating valve test mode, wherein the refrigerating valve test mode means that one indoor unit in the multi-split system is in a heating operation mode, and the rest indoor units are in a standby mode.
S502, judging whether the system normally runs, if so, executing a step S503; if not, step S504 is performed.
And S503, after the first preset time, acquiring a first temperature at a refrigerant inlet of a target indoor unit of the multi-split system, and then executing the step S505.
S504, detection fails, and detection is quit.
And S505, closing the refrigerating valve of the target indoor unit.
And S506, after the second preset time, acquiring a second temperature at the refrigerant inlet of the target indoor unit of the multi-split system and the temperature of the environment where the target indoor unit is located, and then executing the step S507.
S507, judging whether the difference value between the first temperature and the second temperature is smaller than or equal to a first temperature threshold value or not, and whether the difference value between the second temperature and the temperature of the environment where the target indoor unit is located is larger than or equal to a second temperature threshold value or not, if so, executing a step S509; if not, step S508 is performed.
And S508, the refrigerating valve of the target indoor unit has no leakage fault.
And S509, leakage faults exist in the refrigerating valve of the target indoor unit.
Therefore, whether the leakage fault exists in the refrigerating valve is judged according to the temperature change condition of the refrigerant inlet of the target indoor unit before and after the refrigerating valve is closed, so that the indoor unit side refrigerant is cut off in time when the target indoor unit leaks the refrigerant, and the safety problem caused by the excessive refrigerant content in the space where the target indoor unit is located is avoided.
In one example of the present invention, after controlling the multi-split air conditioning system to enter the refrigeration valve test mode, the method further includes: determining the capacity of a target indoor unit currently in a cooling operation mode; and determining a first preset time length and a second preset time length according to the capacity of the target internal machine.
Specifically, the time required for temperature change at a refrigerant inlet of the target indoor unit is related to the capacity of the target indoor unit, and the change time corresponding to different capacities may be different, so that after the multi-split air conditioning system is controlled to enter the refrigeration valve test mode, a first preset time and a second preset time are determined according to the capacity of the target indoor unit, so as to obtain a first operation parameter after the first preset time and obtain a second operation parameter after the second preset time, and reliability and accuracy of the obtained first operation parameter and the obtained second operation parameter can be ensured.
It should be noted that, in general, the time for completing the leakage detection of one refrigerant valve of the multi-split air-conditioning system may be 15min to 30min (minutes), and therefore, the sum of the first preset time and the second preset time should be less than the time required for actually detecting the refrigerant valve, for example, 25min (minutes).
In summary, according to the method for detecting leakage of the refrigeration valve of the multi-split system in the embodiment of the present invention, according to the return air pressure of the compressor before and after the refrigeration valve of the target indoor unit of the multi-split system in the heating operation mode is closed or the temperature at the refrigerant inlet of the target indoor unit, whether the refrigeration valve has a leakage fault can be effectively detected, so that the refrigerant on the indoor unit side is cut off by the refrigeration valve when the refrigerant leakage occurs in the target indoor unit, and potential safety hazards caused by too high refrigerant content are avoided.
The invention also provides a computer readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for detecting the leakage of the refrigeration valve of the multi-split system is realized.
When the computer program stored on the computer readable storage medium is executed by the processor, whether the leakage fault exists in the refrigerating valve can be effectively detected, so that the refrigerant on the side of the target indoor unit is cut off through the refrigerating valve when the refrigerant leaks from the target indoor unit, and potential safety hazards caused by overhigh refrigerant content are avoided.
The invention also provides a leakage detection device for the refrigeration valve of the multi-split system, and fig. 6 is a structural block diagram of the leakage detection device for the refrigeration valve of the multi-split system according to the embodiment of the invention.
As shown in fig. 6, the leakage detecting apparatus 100 for a refrigerant valve of a multi-split system includes: a first acquisition module 10, a second acquisition module 20, and a control module 30.
The first obtaining module 10 is configured to obtain a first operating parameter of the multi-split system after a first preset time, where the first operating parameter includes any one of the following parameters: the method comprises the following steps that a first back pressure of a compressor and a first temperature at a refrigerant inlet of a target indoor unit in a refrigeration running mode are set; the second obtaining module 20 is configured to obtain a second operation parameter of the multi-split system after a second preset time period, where the second operation parameter includes any one of the following parameters: the second return air pressure of the compressor, the second temperature at the refrigerant inlet of the target indoor unit and the type of the second operation parameter are the same as those of the first operation parameter; the control module 30 is configured to control the multi-split system to enter a refrigeration valve test mode when a leakage detection instruction of the refrigeration valve is obtained, where the refrigeration valve test mode indicates that one of the internal machines in the multi-split system is in a refrigeration operation mode and the other internal machines are in a standby mode; a refrigeration valve for shutting down the target indoor unit; and the system is used for determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter.
Specifically, in the operation process of the multi-split air conditioning system, firstly, when a leakage detection instruction of a refrigeration valve is acquired, the multi-split air conditioning system is controlled to enter a refrigeration valve test mode through the control module 30, then, a first operation parameter of the multi-split air conditioning system is acquired through the first acquisition module 10 and is sent to the control module 30, then, the refrigeration valve of a target indoor unit is closed, and then, a second operation parameter of the multi-split air conditioning system is acquired through the second acquisition module 20 and is sent to the control module 30; finally, the control module 30 determines whether the leakage fault exists in the refrigeration valve of the target indoor unit according to the first operating parameter and the second operating parameter.
It should be noted that other specific embodiments of the leakage detection device for the refrigeration valve of the multi-split system may refer to the specific embodiments of the leakage detection method for the refrigeration valve of the multi-split system in the foregoing embodiments, and in order to avoid redundancy, no further description is given here.
According to the leakage detection device for the refrigeration valve of the multi-split system, provided by the embodiment of the invention, whether the leakage fault exists in the refrigeration valve can be effectively detected according to the return air pressure of the compressor before and after the refrigeration valve of the target indoor unit of the multi-split system in the refrigeration operation mode is closed or the temperature at the refrigerant inlet of the target indoor unit, so that the refrigerant on the side of the indoor unit is cut off by the refrigeration valve when the refrigerant leaks from the target indoor unit, and the potential safety hazard caused by overhigh refrigerant content is avoided.
Fig. 7 is a block diagram of a multi-connected system according to an embodiment of the present invention. As shown in fig. 7, the multi-split system 1000 includes the multi-split system refrigerant valve leakage detecting apparatus 100 of the above embodiment.
According to the multi-split system provided by the embodiment of the invention, through the leakage detection device for the refrigerating valve of the multi-split system, whether the refrigerating valve has a leakage fault can be effectively detected according to the return air pressure of the compressor before and after the refrigerating valve of the target indoor unit of the multi-split system in the heating operation mode is closed or the temperature at the refrigerant inlet of the target indoor unit, so that the refrigerant on the side of the indoor unit is cut off through the refrigerating valve when the target indoor unit has refrigerant leakage, and the potential safety hazard caused by overhigh refrigerant content is avoided.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
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, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A leakage detection method for a refrigeration valve of a multi-split system is characterized by comprising the following steps:
when a leakage detection instruction of a refrigerating valve is obtained, controlling the multi-split air conditioner system to enter a refrigerating valve test mode, wherein the refrigerating valve test mode refers to that one indoor unit in the multi-split air conditioner system is in a refrigerating operation mode and the other indoor units are in a standby mode;
after a first preset time, acquiring a first operation parameter of the multi-split system, wherein the first operation parameter comprises any one of the following parameters: the method comprises the following steps that a first back pressure of a compressor and a first temperature at a refrigerant inlet of a target indoor unit in a refrigeration running mode are set;
closing a refrigeration valve of the target indoor unit;
after a second preset time, acquiring a second operation parameter of the multi-split system, wherein the second operation parameter comprises any one of the following parameters: a second return air pressure of the compressor and a second temperature at a refrigerant inlet of the target indoor unit, wherein the second operation parameter is the same as the first operation parameter in parameter type;
and determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter.
2. The method of claim 1, wherein the first operating parameter is a first return pressure of the compressor and the second operating parameter is a second return pressure of the compressor;
the determining whether a leakage fault exists in a refrigeration valve corresponding to the target indoor unit according to the first operating parameter and the second operating parameter includes:
if the difference value between the second return air pressure and the first return air pressure is larger than or equal to a first pressure threshold value, determining that a refrigerating valve of the target indoor unit has no leakage fault;
alternatively, the first and second electrodes may be,
if the second return air pressure is smaller than or equal to a second pressure threshold value, determining that a refrigerating valve of the target indoor unit has no leakage fault;
alternatively, the first and second electrodes may be,
and if the system has low-pressure protection, determining that the refrigerating valve of the target indoor unit has no leakage fault.
3. The method of claim 1, wherein the first operating parameter is a first temperature at the target indoor unit refrigerant inlet, and the second operating parameter is a second temperature at the target indoor unit refrigerant inlet;
the determining whether the leakage fault exists in the refrigeration valve of the target indoor unit according to the first operating parameter and the second operating parameter comprises the following steps:
and if the difference value between the first temperature and the second temperature is smaller than or equal to a first temperature threshold value, determining that the leakage fault exists in the refrigerating valve of the target indoor unit.
4. The method according to claim 3, wherein before determining that there is a leak fault with the refrigerant valve of the target indoor unit, further comprising:
and determining that the difference value between the second temperature and the temperature of the environment where the target indoor unit is located is greater than or equal to a second temperature threshold value.
5. The method as claimed in any one of claims 1 to 4, wherein after controlling the multi-split system to enter the refrigeration valve test mode, the method further comprises:
determining the capacity of a target indoor unit currently in a cooling operation mode;
and determining the first preset time and the second preset time according to the capacity of the target indoor unit.
6. A computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the multi-split system refrigerant valve leak detection method as recited in any one of claims 1 to 5.
7. The utility model provides a multi-online system refrigeration valve leak detection device which characterized in that includes:
the first obtaining module is configured to obtain a first operating parameter of the multi-split air-conditioning system after a first preset time period, where the first operating parameter includes any one of the following parameters: the method comprises the following steps that a first back pressure of a compressor and a first temperature at a refrigerant inlet of a target indoor unit in a refrigeration running mode are set;
the second obtaining module is configured to obtain a second operation parameter of the multi-split system after a second preset time period, where the second operation parameter includes any one of the following parameters: a second return air pressure of the compressor and a second temperature at a refrigerant inlet of the target indoor unit, wherein the second operation parameter is the same as the first operation parameter in parameter type;
the control module is used for controlling the multi-split air conditioner system to enter a refrigerating valve test mode when a refrigerating valve leakage detection instruction is obtained, wherein the refrigerating valve test mode refers to that one indoor unit in the multi-split air conditioner system is in a refrigerating operation mode and the other indoor units are in a standby mode; a refrigeration valve for closing the target indoor unit; and the system is used for determining whether the leakage fault exists in the refrigerating valve of the target indoor unit according to the first operating parameter and the second operating parameter.
8. A multi-split system, comprising the multi-split system refrigerant valve leakage detecting device as recited in claim 7.
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