CN116951662A - Method for detecting leakage position of refrigerant, storage medium and air conditioning system - Google Patents
Method for detecting leakage position of refrigerant, storage medium and air conditioning system Download PDFInfo
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- CN116951662A CN116951662A CN202210416448.6A CN202210416448A CN116951662A CN 116951662 A CN116951662 A CN 116951662A CN 202210416448 A CN202210416448 A CN 202210416448A CN 116951662 A CN116951662 A CN 116951662A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 268
- 238000004378 air conditioning Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000008859 change Effects 0.000 claims abstract description 66
- 239000007788 liquid Substances 0.000 claims description 91
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000001514 detection method Methods 0.000 abstract description 29
- 238000012423 maintenance Methods 0.000 abstract description 12
- 230000007423 decrease Effects 0.000 description 11
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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Classifications
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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
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/64—Airborne particle content
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
Abstract
The invention discloses a method for detecting a refrigerant leakage position, a storage medium and an air conditioning system, wherein the method comprises the following steps: determining the state of a refrigerant flowing through a to-be-detected point; detecting the temperature change of a to-be-detected point; judging whether the refrigerant leakage occurs at the point to be detected according to the refrigerant state and the temperature change. The detection method can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a method for detecting a refrigerant leakage position, a computer readable storage medium and an air conditioning system.
Background
With the improvement of living standard of people, an air conditioner has been widely used as a device for adjusting indoor temperature. However, in the installation process and the long-term use process of the air conditioner, the pipeline may be damaged due to bending, long-term corrosion or other external unreliability, so that the refrigerant leakage of the air conditioner is caused, the refrigerating or heating effect of the air conditioner is affected, and even equipment is burnt and explosion occurs when serious.
At present, in a multi-split air conditioner, if refrigerant leakage occurs, lubricating oil flowing together with the refrigerant can be sprayed out at the leakage place, so that the vicinity of a pipeline (attic, wall surface and the like) becomes dirty, and the attention of a user can be drawn. In this case the location of the leak can be determined from the stain, but it is not possible to determine which pipe has a leak. When maintenance is performed, a maintenance worker can only check all the pipes by means of own feeling and experience and combining a refrigerant leakage detector, so that the position of refrigerant leakage can be determined.
In addition, when the air conditioner is in operation, the leakage of the refrigerant can be determined by detecting the fact that the refrigerant flow rate is reduced to a certain value, and even if the refrigerant leakage of the air conditioner can be determined according to the reduction of the refrigerant flow rate, the problem of which indoor unit is caused cannot be determined. To determine which particular indoor unit has leaked, it is time and effort consuming to remove the ceilings and walls near all indoor units.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a method for detecting a refrigerant leakage position, which can detect whether the refrigerant leaks according to the state of the refrigerant to be detected and the temperature change, so as to determine the leakage position when the refrigerant leaks, improve the detection efficiency of refrigerant leakage, shorten the detection time, facilitate after-sales maintenance, and eliminate potential safety hazards.
A second object of the present invention is to provide a method for detecting a refrigerant leakage position.
A third object of the present invention is to propose a computer-readable storage medium.
A fourth object of the present invention is to provide an air conditioning system.
To achieve the above object, an embodiment of the present invention provides a method for detecting a refrigerant leakage position, including: determining the state of a refrigerant flowing through a to-be-detected point; detecting the temperature change of a to-be-detected point; judging whether the refrigerant leakage occurs at the point to be detected according to the refrigerant state and the temperature change.
According to the method for detecting the refrigerant leakage position, firstly, the state of the refrigerant flowing through the to-be-detected point is determined, then the temperature change of the to-be-detected point is detected, and finally whether the refrigerant leakage occurs at the to-be-detected point is judged according to the state of the refrigerant and the temperature change. Therefore, the method can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
In addition, the method for detecting the refrigerant leakage position according to the above embodiment of the present invention may further have the following additional technical features:
According to one embodiment of the present invention, the refrigerant state includes a gaseous state, a liquid state and a mixed state of gas and liquid, wherein determining whether the refrigerant leakage occurs at the point to be measured according to the refrigerant state and the temperature change includes: when the refrigerant flowing through the to-be-measured point is in a gaseous state, if the temperature rise of the to-be-measured point is determined according to the temperature change, judging that the refrigerant leakage occurs at the to-be-measured point; when the refrigerant flowing through the to-be-measured point is in a liquid state or a gas-liquid mixed state, if the temperature drop of the to-be-measured point is determined according to the temperature change, judging that the refrigerant leakage occurs at the to-be-measured point.
According to one embodiment of the present invention, detecting a temperature change at a point to be detected includes: acquiring the current temperature of a to-be-measured point; and comparing the current temperature with the temperature of the point to be detected in a normal state without leakage so as to judge whether the temperature of the point to be detected rises or falls.
To achieve the above object, a second aspect of the present invention provides a method for detecting a leakage position of a refrigerant, the method being applied to an air conditioning system, the air conditioning system including at least one indoor unit, the indoor unit including an indoor heat exchanger, the air conditioning system further including at least one expansion valve disposed corresponding to the at least one indoor heat exchanger, an inlet pipe of the indoor heat exchanger being provided with a first temperature sensor for detecting a temperature of the inlet pipe when the air conditioning system heats, an outlet pipe of the indoor heat exchanger being provided with a second temperature sensor for detecting a temperature of the outlet pipe when the air conditioning system heats, the method further comprising: controlling an air conditioning system to heat so as to store liquid refrigerant in the indoor unit; when the heating time of the air conditioning system reaches a first preset time or the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is larger than a first preset temperature difference threshold value, controlling the air conditioning system to stop heating; detecting whether the refrigerant leaks.
According to the method for detecting the leakage position of the refrigerant, firstly, the air conditioning system is controlled to heat so as to enable the interior of the indoor unit to store the liquid refrigerant, and then when the heating time of the air conditioning system reaches a first preset time or the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is larger than a first preset temperature difference threshold value, the air conditioning system is controlled to stop heating, and finally whether the refrigerant leaks or not is detected. Therefore, the method can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
In addition, the method for detecting the refrigerant leakage position according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, when the air conditioning system heats, the opening degree of the expansion valve is adjusted to be smaller and/or the fan rotation speed of the indoor unit is adjusted to be larger.
According to one embodiment of the present invention, the expansion valve is closed when the air conditioning system stops heating.
According to one embodiment of the present invention, detecting whether the refrigerant leaks includes: acquiring indoor environment temperature, temperature change of an inlet pipeline and temperature change of an outlet pipeline; when the indoor environment temperature is smaller than the first preset temperature, if the temperature of the outlet pipeline is reduced in an accelerating way and the temperature of the inlet pipeline is reduced normally, determining that the outlet pipeline is leaked by the refrigerant; when the indoor environment temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipeline corresponding to the to-be-measured point is reduced in an acceleration mode and the temperature of the inlet pipeline is reduced normally and then is increased, determining that the outlet pipeline is leaked by the refrigerant; when the indoor environment temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipeline rises and the temperature of the inlet pipeline rises, the refrigerant leakage of the outlet pipeline is determined.
According to one embodiment of the present invention, the accelerated decrease is determined when the decrease speed of the temperature of the outlet pipe of the indoor unit is greater than the set threshold value.
According to one embodiment of the present invention, detecting whether a refrigerant leaks includes: acquiring indoor environment temperature, temperature change of an inlet pipeline and temperature change of an outlet pipeline; when the indoor environment temperature is smaller than the first preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is increased, determining that the refrigerant leakage occurs in the inlet pipeline; when the indoor environment temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is normally increased, determining that the refrigerant leakage occurs in the inlet pipeline; when the indoor environment temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is increased, determining that the refrigerant leakage occurs in the inlet pipeline.
According to one embodiment of the present invention, before acquiring the indoor ambient temperature, the temperature change of the inlet pipe and the temperature change of the outlet pipe, detecting whether the refrigerant leaks includes: acquiring the current temperature of the inlet pipeline and/or the current temperature of the outlet pipeline; and determining that the refrigerant leaks when the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline when no leakage occurs is greater than a second preset temperature difference threshold value and/or if the difference between the current temperature of the outlet pipeline and the temperature of the outlet pipeline when no leakage occurs is greater than the second preset temperature difference threshold value.
According to one embodiment of the present invention, the duration of detecting whether the refrigerant leaks is at least four hours.
To achieve the above object, according to a third aspect of the present invention, there is provided a computer-readable storage medium storing a program for detecting a refrigerant leakage position, which when executed by a processor, implements the above-mentioned method for detecting a refrigerant leakage position.
By executing the method for detecting the leakage position of the refrigerant, the computer-readable storage medium can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
In order to achieve the above object, an air conditioning system according to a fourth aspect of the present invention includes a memory, a processor, and a program for detecting a refrigerant leakage position stored in the memory and executable by the processor, wherein the method for detecting a refrigerant leakage position is implemented when the processor executes the program for detecting a refrigerant leakage position.
According to the air conditioning system provided by the embodiment of the invention, by executing the method for detecting the leakage position of the refrigerant, whether the refrigerant leaks or not can be detected according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for detecting a refrigerant leak location according to an embodiment of the invention;
FIG. 2 is a graph showing the temperature change with time after leakage of different refrigerant states according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a refrigerant leakage position detection according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a refrigerant leakage position detection according to another embodiment of the present invention;
fig. 6 is a block diagram of an air conditioning system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a method for detecting a refrigerant leakage position, a computer-readable storage medium, and an air conditioning system according to an embodiment of the present invention with reference to the accompanying drawings.
In one embodiment of the present invention, as shown in fig. 3, the air conditioning system may include a compressor, an outdoor unit, an outdoor heat exchanger, and a plurality of indoor units, wherein each of the indoor units includes an indoor heat exchanger, an expansion valve is provided in the outdoor unit and an opening degree is adjustable for controlling a flow rate of a refrigerant flowing through the electronic expansion valve, that is, the greater the opening degree of the expansion valve, the more the flow rate of the refrigerant flowing through the expansion valve, the smaller the opening degree of the expansion valve, and the less the flow rate of the refrigerant flowing through the expansion valve. And each indoor heat exchanger is also correspondingly provided with a fan, and the gear of each fan can be adjusted to adjust the rotating speed of the fan.
It should be understood that the specific construction and operation of each component in the air conditioning system is well known in the art and will not be described in detail herein.
Fig. 1 is a flowchart of a method for detecting a refrigerant leakage position according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting a refrigerant leakage position according to an embodiment of the present invention may include the following steps:
s1, determining the state of the refrigerant flowing through the to-be-detected point.
S2, detecting the temperature change of the to-be-detected point. Wherein, the temperature change condition of the to-be-detected point can be determined by a temperature sensor arranged at the to-be-detected point.
S3, judging whether the refrigerant leakage occurs at the point to be detected according to the refrigerant state and the temperature change.
Specifically, in detecting a position where a refrigerant leaks, it is generally detected that a gas pipe or a liquid pipe leaks, and therefore, a point to be measured is generally disposed on an inlet pipe (gas pipe) and an outlet pipe (liquid pipe) of the indoor heat exchanger. If the refrigerant in the liquid pipe leaks, the liquid refrigerant nearby evaporates according to the amount of the leaked refrigerant, and the temperature nearby drops due to heat absorption caused by the evaporation of the liquid refrigerant; if the refrigerant in the gas pipe leaks, the high-temperature gaseous refrigerant near the compressor flows into the gas pipe, and the temperature in the vicinity also increases. The evaporation of the liquid refrigerant will bring about a decrease in temperature as long as the liquid refrigerant is present in the tube, whether it is an air tube or a liquid tube. Therefore, it is necessary to determine whether the refrigerant leakage occurs at the point to be measured according to the state of the refrigerant and the temperature change.
According to an embodiment of the present invention, the refrigerant state may include a gaseous state, a liquid state and a mixed state of gas and liquid, wherein determining whether the refrigerant leakage occurs at the point to be measured according to the refrigerant state and the temperature change includes: when the refrigerant flowing through the to-be-measured point is in a gaseous state, if the temperature rise of the to-be-measured point is determined according to the temperature change, judging that the refrigerant leakage occurs at the to-be-measured point; when the refrigerant flowing through the to-be-measured point is in a liquid state or a gas-liquid mixed state, if the temperature drop of the to-be-measured point is determined according to the temperature change, judging that the refrigerant leakage occurs at the to-be-measured point.
Specifically, the refrigerant may be in various states such as a gaseous state, a liquid state, and a gas-liquid mixed state during the operation of the air conditioner. Taking heating operation of an air conditioning system as an example, a high-temperature high-pressure gaseous refrigerant coming out of a compressor enters an indoor heat exchanger, the refrigerant after heat exchange of the indoor heat exchanger becomes liquid, part of the liquid refrigerant is gasified through the obstruction of an expansion valve, the liquid refrigerant becomes gas, the refrigerant after passing through the expansion valve becomes a two-phase mixture (gas-liquid mixed state), and the liquid in the mixture becomes gas again after heat exchange in an outdoor heat exchanger and returns to the compressor. Meanwhile, if the refrigerant flowing through the point to be detected is a liquid refrigerant or a gas-liquid mixed state refrigerant, if the refrigerant leaks, the liquid refrigerant can evaporate when encountering indoor air, and the temperature near the point to be detected can be relatively reduced after absorbing heat of the surrounding environment, so that the refrigerant leakage can be judged according to the temperature reduction of the point to be detected; if the refrigerant flowing through the point to be detected is a gaseous refrigerant, if the refrigerant leaks, the temperature near the point to be detected can be increased by the high-temperature and high-pressure gas compressed by the compressor, so that the occurrence of the leakage of the refrigerant can be judged according to the temperature increase of the refrigerant flowing through the point to be detected.
Further, according to an embodiment of the present invention, detecting a temperature change of a point to be measured includes: acquiring the current temperature of a to-be-measured point; and comparing the current temperature with the temperature of the point to be detected in a normal state without leakage so as to judge whether the temperature of the point to be detected rises or falls.
Specifically, the current temperature of the point to be measured may be obtained by a temperature sensor provided at the point to be measured. In order to judge whether the temperature of the point to be measured changes, the temperature of the point to be measured acquired by the current temperature sensor is required to be compared with the temperature of the point to be measured when the air conditioner operates normally, so that whether the temperature of the point to be measured changes is judged. The data of the air conditioner system in normal operation is preset in a memory of the air conditioner system, and when the air conditioner is in different working conditions or the air conditioner is in different working modes, the temperature data of the air conditioner of different models in normal operation are different.
For example, the current temperature of the point to be measured is obtained, and then the current temperature of the point to be measured is compared with normal data (normal operation time data) stored in advance in the air conditioning system. The data at the normal time is shown by a curve 3 in fig. 2, and when the refrigerant leaks, the temperature change is relatively remarkable, and as shown by a broken line in fig. 2, some parts are raised with respect to the curve 3, and some parts are lowered with respect to the curve 3. Specifically, the change in temperature is represented by a temperature drop due to evaporation of the liquid refrigerant, as shown by a curve 2 in fig. 2, or a temperature rise due to inflow of the high-pressure gas, as shown by a curve 1 in fig. 2.
In summary, according to the method for detecting a refrigerant leakage position in the embodiment of the present invention, the state of the refrigerant flowing through the to-be-detected point is first determined, then the temperature change of the to-be-detected point is detected, and finally whether the to-be-detected point has refrigerant leakage is determined according to the state of the refrigerant and the temperature change. Therefore, the method can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
According to another embodiment of the present invention, the method for detecting a refrigerant leakage position is applied to an air conditioning system, the air conditioning system includes at least one indoor unit, the indoor unit includes an indoor heat exchanger, the air conditioning system further includes at least one expansion valve disposed corresponding to the at least one indoor heat exchanger, an inlet pipe of the indoor heat exchanger is provided with a first temperature sensor when the air conditioning system heats, the first temperature sensor is used for detecting a temperature of the inlet pipe, an outlet pipe of the indoor heat exchanger is provided with a second temperature sensor when the air conditioning system heats, the second temperature sensor is used for detecting a temperature of the outlet pipe, and the method further includes: controlling an air conditioning system to perform heating operation so as to store liquid refrigerant in the indoor unit; when the heating time of the air conditioning system reaches a first preset time or the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is larger than a first preset temperature difference threshold value, controlling the air conditioning system to stop heating; detecting whether the refrigerant leaks. The first preset time and the first preset temperature difference threshold may be set according to practical situations, and in general, the first preset time may be set to 30 minutes, and the first preset threshold may be set to 10K.
According to one embodiment of the present invention, when the air conditioning system heats, the opening degree of the expansion valve of the indoor unit is adjusted to be smaller and/or the rotation speed of the fan of the indoor unit is adjusted to be larger.
According to one embodiment of the present invention, the expansion valve is closed when the air conditioning system stops heating.
Specifically, the air conditioning system may include at least one indoor unit or may include a plurality of indoor units. When the number of indoor units in the air conditioning system is one, whether the refrigerant leaks in the outdoor unit or the indoor unit can be judged. When there are a plurality of indoor units in the air conditioning system, it is possible to determine which indoor unit has a leak. The indoor unit includes an indoor heat exchanger and an expansion valve, and in general, in a commercial air conditioner, the expansion valve is generally disposed in the indoor unit, and in a home air conditioner, the expansion valve is generally disposed in the outdoor unit. Taking the air conditioning system as an example of one air conditioning system in fig. 3 (one outdoor unit corresponds to three indoor units), the expansion valve is arranged in the outdoor unit, so that in order to store liquid refrigerant in the indoor heat exchanger as much as possible, the air conditioning system can be conveniently controlled to perform refrigerant leakage detection according to the residual refrigerant amount when the air conditioning system stops heating, and the flow direction of the refrigerant can be controlled to flow into the indoor heat exchanger from the air pipe at the moment, flow into the outdoor heat exchanger after passing through the expansion valve after passing through the indoor heat exchanger. When the air conditioning system heats, the refrigerant firstly passes through the air pipe and enters the indoor heat exchanger, then enters the liquid pipe after coming out of the indoor heat exchanger, a temperature sensor is arranged at an inlet pipeline of the indoor heat exchanger of each indoor machine and used for detecting the temperature of the inlet pipeline, and similarly, a temperature sensor is also arranged at an outlet pipeline of the indoor heat exchanger of each indoor machine and used for detecting the temperature of the outlet pipeline, so as to detect the temperature change condition.
Because the refrigerant in the high-temperature gas state passes through the indoor heat exchanger and is cooled by the fan, the temperature difference between the air pipe and the liquid pipe is large, and the refrigerant can be changed into a liquid state from the gas state. In order to store the liquid refrigerant in the indoor heat exchanger, the opening degree of the expansion valve on the liquid pipe can be adjusted when the air conditioning system heats, so that the temperature difference between the temperature of the air pipe and the temperature of the liquid pipe is as large as possible. For example, for a commercial air conditioner, the opening degree of the expansion valve corresponding to each indoor unit may be reduced to reduce the flow rate of the liquid refrigerant flowing through the expansion valve, or the fan gear of each indoor unit may be increased, so that the heat exchange is more complete, and the difference between the air pipe temperature and the liquid pipe temperature is as large as possible. For the household air conditioner, the expansion valve is arranged in the outdoor unit, so that the opening of the expansion valve corresponding to the outdoor unit can be reduced, the flow of liquid refrigerant flowing through the expansion valve can be reduced, or the gear of a fan of the outdoor unit is increased, the rotating speed of the fan is increased, the heat exchange is more sufficient, the difference between the temperature of an air pipe and the temperature of a liquid pipe is as large as possible, and the liquid refrigerant is conveniently stored in the indoor heat exchanger.
Before the refrigerant leakage detection, in order to reduce the influence caused by the movement of the refrigerant, it is necessary to control the air conditioning system to stop heating, and when the following conditions are satisfied, it is confirmed that the refrigerant leakage detection conditions are satisfied, and the air conditioning system is controlled to stop heating. When the heating time of the air conditioning system reaches a certain time (such as a first preset time and 30 min), or when the heating time of the air conditioning system is up, the opening of the expansion valve on the liquid pipe is adjusted to enable the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline of the indoor unit to be larger than a temperature difference threshold (such as a first preset temperature difference threshold and 10K), the air conditioning system is controlled to stop heating. Wherein, the air conditioning system stops heating refers to the stop of a compressor, the stop of an outdoor fan, the stop of an indoor fan and the like of the air conditioning system.
In addition, when the air conditioning system heats, if the defrosting or oil returning mode is required to be operated, the air conditioning system heats after the defrosting or oil returning mode is completed, the operation time is required to be accumulated again, and similarly, the expansion valve on the liquid pipe is required to be controlled again. And controlling the air conditioning system to stop heating until the heating time of the air conditioning system reaches 30min or the temperature difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is more than 10K. Namely, the compressor is controlled to stop running, the outdoor fan is controlled to stop running, the indoor fan is controlled to stop running, and the expansion valve is controlled to be closed when the air conditioning system stops heating.
It should be noted that, the heating operation time of the air conditioner can also be calculated by setting a timer, and when the timing time of the timer reaches the preset time, the air conditioner system is automatically controlled to stop heating so as to perform subsequent refrigerant leakage detection.
According to one embodiment of the present invention, the duration of detecting whether the refrigerant leaks is at least four hours.
Specifically, the time of temperature change varies according to the state of the refrigerant (the time to reach the pressure equalizing varies according to the amount of the refrigerant), so the refrigerant leakage detection is continued for 4 hours after the air conditioning system stops heating, so as to detect whether the refrigerant leaks.
According to one embodiment of the present invention, before acquiring the indoor ambient temperature, the temperature change of the inlet pipe and the temperature change of the outlet pipe, detecting whether the refrigerant leaks includes: acquiring the current temperature of the inlet pipeline and/or the current temperature of the outlet pipeline; and determining that the refrigerant leaks when the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline when no leakage occurs is greater than a second preset temperature difference threshold value and/or if the difference between the current temperature of the outlet pipeline and the temperature of the outlet pipeline when no leakage occurs is greater than the second preset temperature difference threshold value. The second preset temperature difference threshold value is determined according to practical conditions.
That is, the current temperature of the inlet line or the current temperature of the outlet line, or the current temperature of the inlet line and the current temperature of the outlet line, is obtained by the temperature sensor. Comparing the current temperature of the inlet pipeline with the temperature of the inlet pipeline when no leakage occurs, if the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline is larger (larger than a second preset temperature difference threshold), judging that the refrigerant inlet pipeline leaks, or comparing the current temperature of the outlet pipeline with the temperature of the outlet pipeline when no leakage occurs, if the difference between the current temperature of the outlet pipeline and the temperature of the inlet pipeline is larger (larger than the second preset temperature difference threshold), judging that the refrigerant leaks in the inlet pipeline and the outlet pipeline, or comparing the current temperature of the outlet pipeline and the temperature of the inlet pipeline with the temperature of the outlet pipeline and the temperature of the inlet pipeline when no leakage occurs, and if the difference between the temperatures of the outlet pipeline and the inlet pipeline is larger (larger than the second preset temperature difference threshold).
According to one embodiment of the present invention, the method for detecting whether the refrigerant leaks further includes: acquiring indoor environment temperature, temperature change of an inlet pipeline and temperature change of an outlet pipeline; when the indoor environment temperature is smaller than the first preset temperature, if the temperature of the outlet pipeline is reduced in an accelerating way and the temperature of the inlet pipeline is reduced normally, determining that the outlet pipeline is leaked by the refrigerant; when the indoor environment temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipeline is reduced in an accelerating way and the temperature of the inlet pipeline is reduced normally and then is increased, determining that the outlet pipeline is leaked by the refrigerant; when the indoor environment temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipeline rises and the temperature of the inlet pipeline rises, the refrigerant leakage of the outlet pipeline is determined. The first preset temperature and the second preset temperature are determined according to actual conditions.
According to one embodiment of the present invention, the accelerated decrease is determined when the decrease speed of the temperature of the outlet pipe of the indoor unit is greater than the set threshold value. The set threshold may be determined according to the actual situation.
Specifically, since the storage amount of the liquid refrigerant stored in the indoor unit varies depending on different indoor temperatures, the temperature change in which the refrigerant leaks according to different indoor temperatures varies. Therefore, it is necessary to determine whether or not the refrigerant leaks by changing the temperature of the indoor environment, the liquid pipe temperature (outlet pipe temperature), and the gas pipe temperature (inlet pipe temperature).
Because the different indoor environment temperatures are different, the liquid refrigerant storage quantity of the corresponding indoor heat exchanger is different, for example, under the condition that the indoor environment temperature is lower, the difference value between the temperature of an inlet pipeline and the temperature of an outlet pipeline is larger than a certain value (such as 3K), and in the indoor heat exchanger, the heat exchange effect is better, and the gaseous refrigerant can be condensed and tends to be liquefied; under the condition of higher indoor environment temperature, the difference between the temperature of the air pipe and the temperature of the liquid pipe is smaller than a certain value (such as 1K), the heat exchange of the indoor heat exchanger is insufficient, the gaseous refrigerant is not easy to condense, and the liquid refrigerant has a tendency of gasification; under the condition that the indoor environment temperature is not high or low, the refrigerant in the indoor heat exchanger can exchange heat, but a small amount of liquid refrigerant can be left in the indoor heat exchanger due to the fact that the condensation amount is small. That is, the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is more than 3K, which means that the indoor temperature is lower, and the gaseous refrigerant is changed into the liquid refrigerant to release heat. If the temperature difference between the inlet pipe temperature and the outlet pipe temperature is not changed, for example, the difference is less than 1k, the inlet pipe and the outlet pipe are at almost the same temperature, that is, the gaseous refrigerant entering from the air pipe is not cooled at high room temperature, and therefore, the gaseous refrigerant is not changed into liquid refrigerant (not easy to be changed), so that the liquid refrigerant is less at high room temperature. Therefore, before judging whether the refrigerant leakage occurs at the point to be detected according to the refrigerant state and the temperature change, the current indoor environment temperature and the current condition of the refrigerant in the indoor heat exchanger need to be judged.
The following describes in detail how to judge the condition of refrigerant leakage of the liquid pipe or the air pipe.
Specifically, as shown in fig. 4, taking commercial air conditioner detection as an example, the expansion valve is disposed in the indoor unit, when the current indoor environment temperature is low room temperature (less than the first preset temperature), the liquid pipe temperature (the temperature of the outlet pipeline) and the air pipe temperature (the temperature of the inlet pipeline) will change according to the external environment under normal conditions, the temperature will normally drop, and if the liquid pipe temperature is detected to drop rapidly (the temperature drop speed is greater than the set threshold), and the air pipe temperature drops normally, it is indicated that the liquid pipe leaks, so that more liquid refrigerant absorbs ambient heat and evaporates, the liquid pipe temperature drops rapidly, the air pipe is far away from the leaking place, the high-temperature gas refrigerant will be cooled slowly by the external air temperature, the temperature changes with the external environment, and the temperature drops normally.
When the current indoor environment temperature is the middle room temperature (the temperature is greater than or equal to the first preset temperature and less than the second preset temperature), the temperature of the liquid pipe and the temperature of the air pipe can be changed according to the external environment under normal conditions, the temperature is reduced normally, and if the accelerated reduction of the temperature of the liquid pipe and the normal reduction of the temperature of the air pipe are detected, the leakage of the liquid pipe is indicated, the evaporation of a small amount of liquid refrigerant absorbing ambient environment heat is caused, the accelerated reduction of the temperature of the liquid pipe, the normal reduction of the temperature of the air pipe is caused, and after the evaporation of a small amount of liquid refrigerant is finished, the high-temperature gaseous refrigerant remained in the air pipe flows in, so that the temperature of the air pipe is increased.
When the current indoor environment temperature is high room temperature (more than or equal to the second preset temperature), the temperature of the liquid pipe and the temperature of the air pipe can change according to the external environment under normal conditions, and the temperature is reduced normally. When the indoor environment is at a high room temperature, the gaseous refrigerant entering from the air pipe is not cooled, so the gaseous refrigerant is not changed into a liquid refrigerant (is not easy to be changed into the liquid refrigerant), and the liquid refrigerant passing through the indoor heat exchanger is not generated. At this time, if the temperature of the liquid pipe is detected to rise and the temperature of the air pipe rises, it is indicated that the liquid pipe leaks, and the high-temperature gaseous refrigerant which is not liquefied in the indoor heat exchanger flows in, and the temperature rises, and the residual high-temperature gaseous refrigerant which is close to the compressor flows in the air pipe, and the air pipe temperature rises.
According to one embodiment of the present invention, detecting whether the refrigerant leaks includes: acquiring indoor environment temperature, temperature change of an inlet pipeline and temperature change of an outlet pipeline; when the indoor environment temperature is smaller than the first preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is increased, determining that the refrigerant leakage occurs in the inlet pipeline; when the indoor environment temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is normally increased, determining that the refrigerant leakage occurs in the inlet pipeline; when the indoor environment temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is increased, determining that the refrigerant leakage occurs in the inlet pipeline.
Specifically, as shown in fig. 5, taking commercial air conditioner detection as an example, the expansion valve is disposed in the indoor unit, when the current indoor environment temperature is low (less than the first preset temperature), the liquid pipe temperature (the temperature of the outlet pipeline) and the air pipe temperature (the temperature of the inlet pipeline) will change according to the external environment under normal conditions, the temperature will normally decrease, and if the liquid pipe temperature decreases and the air pipe temperature increases, it indicates that the air pipe leaks, so that the liquid refrigerant in the indoor heat exchanger will evaporate at the position where the air pipe leaks, the temperature decreases, the refrigerant flow in the indoor heat exchanger decreases along with the air pipe leakage, the residual high-temperature gaseous refrigerant near the compressor will flow into the air pipe, so that the air pipe temperature increases, the temperature due to the evaporation of the liquid refrigerant decreases and the temperature due to the inflow of the high-temperature gaseous refrigerant increases, and finally the air pipe temperature changes according to the external environment, and the liquid pipe temperature decreases normally.
When the current indoor environment temperature is the middle room temperature (the temperature is greater than or equal to the first preset temperature and less than the second preset temperature), the temperature of the liquid pipe and the temperature of the air pipe can be changed according to the external environment under normal conditions, the temperature is reduced normally, and if the temperature of the liquid pipe is detected to be reduced and the temperature of the air pipe is increased normally, the leakage of the air pipe is indicated, the residual high-temperature gaseous refrigerant close to the compressor is caused to flow into the air pipe to increase the temperature, the liquid refrigerant between the indoor heat exchanger and the expansion valve can be evaporated, the heat of the surrounding environment is absorbed to reduce the nearby temperature, and the detected temperature of the liquid pipe is reduced.
When the current indoor environment temperature is high room temperature (more than or equal to the second preset temperature), the liquid pipe temperature and the air pipe temperature can change according to the external environment under normal conditions, the temperature normally drops, and if the liquid pipe temperature drops and the air pipe temperature rises, the air pipe is indicated to leak, the high-temperature gaseous refrigerant close to the compressor flows into the air pipe to enable the temperature to rise, the liquid refrigerant between the indoor heat exchanger and the expansion valve can evaporate, the heat of the surrounding environment is absorbed to enable the nearby temperature to drop, and the detected liquid pipe temperature drops.
In the case of the high-capacity indoor unit, it takes time for the pressure of the refrigerant to reach the pressure equalizing state, and it takes time for the temperature change to appear. Therefore, the air conditioning system needs to be stopped for a long period of time (i.e., in a state of pressure equalization when the indoor temperature and the liquid pipe and air pipe temperatures become almost the same).
In summary, according to the method for detecting a refrigerant leakage position in the embodiment of the present invention, firstly, the air conditioning system is controlled to perform heating so as to store the liquid refrigerant in the indoor unit, and then, when the time for performing heating of the air conditioning system reaches a first preset time or the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is greater than a first preset temperature difference threshold, the air conditioning system is controlled to stop heating, and finally, whether the refrigerant leaks is detected. Therefore, the method can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
The present invention also proposes a computer-readable storage medium corresponding to the above-described embodiments.
The computer-readable storage medium of the present invention stores a program for detecting a refrigerant leakage position, which when executed by a processor, implements the above-described method for detecting a refrigerant leakage position.
By executing the method for detecting the leakage position of the refrigerant, the computer-readable storage medium can detect whether the refrigerant leaks according to the state and the temperature change of the refrigerant to be detected, so that the leakage position can be determined when the refrigerant leaks, the detection efficiency of the refrigerant leakage is improved, the detection working time is shortened, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
Corresponding to the embodiment, the invention also provides an air conditioning system.
As shown in fig. 6, the air conditioning system 100 of the present invention may include: the method for detecting the refrigerant leakage position is implemented when the processor 120 executes the program for detecting the refrigerant leakage position.
According to the air conditioning system provided by the embodiment of the invention, by executing the method for detecting the refrigerant leakage position, the refrigerant leakage condition can be detected according to the refrigerant state and the temperature change of the to-be-detected point, the detection efficiency of the refrigerant leakage condition is improved, the after-sale maintenance is convenient, and the potential safety hazard is eliminated.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may 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). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may 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 is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (13)
1. A method for detecting a refrigerant leak location, comprising:
determining the state of a refrigerant flowing through a to-be-detected point;
detecting the temperature change of the point to be detected;
judging whether the refrigerant leakage occurs at the point to be detected according to the refrigerant state and the temperature change.
2. The method of claim 1, wherein the refrigerant state comprises a gaseous state, a liquid state, and a gas-liquid mixed state, wherein determining whether the refrigerant leakage occurs at the point to be measured based on the refrigerant state and the temperature change comprises:
when the refrigerant flowing through the point to be detected is in a gaseous state, if the temperature rise of the point to be detected is determined according to the temperature change, judging that the point to be detected is leaked with the refrigerant;
when the refrigerant flowing through the point to be detected is in a liquid state or a gas-liquid mixed state, if the temperature of the point to be detected is determined to be reduced according to the temperature change, judging that the point to be detected is leaked with refrigerant.
3. The method of claim 2, wherein detecting a temperature change of the point under test comprises:
acquiring the current temperature of the point to be measured;
and comparing the current temperature with the temperature of the point to be detected in a normal state without leakage so as to judge whether the temperature of the point to be detected rises or falls.
4. A method for detecting a refrigerant leakage position, the method being applied to an air conditioning system, the air conditioning system including at least one indoor unit, the indoor unit including an indoor heat exchanger, the air conditioning system further including at least one expansion valve provided in correspondence with at least one of the indoor heat exchangers, an inlet line of the indoor heat exchanger being provided with a first temperature sensor for detecting a temperature of the inlet line when the air conditioning system heats, an outlet line of the indoor heat exchanger being provided with a second temperature sensor for detecting a temperature of the outlet line when the air conditioning system heats, the method further comprising:
controlling the air conditioning system to heat so as to store liquid refrigerant in the indoor unit;
when the heating time of the air conditioning system reaches a first preset time or the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is larger than a first preset temperature difference threshold value, controlling the air conditioning system to stop heating;
detecting whether the refrigerant leaks.
5. The method according to claim 4, wherein the opening degree of the expansion valve is adjusted to be smaller and/or the fan rotation speed of the indoor unit is adjusted to be larger when the air conditioning system heats.
6. The method of claim 4, wherein the expansion valve is closed when the air conditioning system stops heating.
7. The method of claim 4, wherein detecting whether refrigerant is leaking comprises:
acquiring indoor environment temperature, temperature change of the inlet pipeline and temperature change of the outlet pipeline;
when the indoor environment temperature is smaller than a first preset temperature, if the temperature of the outlet pipeline is reduced in an accelerating way and the temperature of the inlet pipeline is reduced normally, determining that the outlet pipeline is leaked by refrigerant;
when the indoor environment temperature is greater than or equal to a first preset temperature and less than a second preset temperature, if the temperature of the outlet pipeline is reduced in an accelerating way and the temperature of the inlet pipeline is increased after being reduced normally, determining that the outlet pipeline is leaked by the refrigerant;
and when the indoor environment temperature is greater than or equal to a second preset temperature, if the temperature of the outlet pipeline rises and the temperature of the inlet pipeline rises, determining that the refrigerant leakage occurs in the outlet pipeline.
8. The method of claim 7, wherein the accelerated descent is determined when a descent speed of the temperature of the outlet pipe of the indoor unit is greater than a set threshold.
9. The method of claim 4, wherein detecting whether refrigerant is leaking comprises:
acquiring indoor environment temperature, temperature change of the inlet pipeline and temperature change of the outlet pipeline;
when the indoor environment temperature is smaller than a first preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is increased, determining that the refrigerant leakage occurs in the inlet pipeline;
when the indoor environment temperature is greater than or equal to a first preset temperature and less than a second preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is normally increased, determining that the inlet pipeline is subjected to refrigerant leakage;
and when the indoor environment temperature is greater than or equal to a second preset temperature, if the temperature of the outlet pipeline is reduced and the temperature of the inlet pipeline is increased, determining that the refrigerant leakage occurs in the inlet pipeline.
10. The method according to claim 8 or 9, wherein detecting whether refrigerant leaks before acquiring the indoor ambient temperature, the temperature change of the inlet line, and the temperature change of the outlet line, comprises:
acquiring the current temperature of the inlet pipeline and/or the current temperature of the outlet pipeline;
And determining that the refrigerant leaks when the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline when no leakage occurs is greater than a second preset temperature difference threshold value and/or if the difference between the current temperature of the outlet pipeline and the temperature of the outlet pipeline when no leakage occurs is greater than the second preset temperature difference threshold value.
11. The method of claim 4, wherein the duration of detecting whether the refrigerant is leaking is at least four hours.
12. A computer-readable storage medium, characterized in that the storage medium stores a program for detecting a refrigerant leakage position, which when executed by a processor, implements the method for detecting a refrigerant leakage position according to any one of claims 1 to 11.
13. An air conditioning system comprising a memory, a processor and a program stored in the memory and executable by the processor for detecting a refrigerant leakage position, wherein the method for detecting a refrigerant leakage position according to any one of claims 1 to 11 is implemented when the program for detecting a refrigerant leakage position is executed by the processor.
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|---|---|---|---|
| CN202210416448.6A CN116951662A (en) | 2022-04-20 | 2022-04-20 | Method for detecting leakage position of refrigerant, storage medium and air conditioning system |
| PCT/CN2022/119968 WO2023201984A1 (en) | 2022-04-20 | 2022-09-20 | Method for detecting refrigerant leakage position, and storage medium and air conditioning system |
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| CN202210416448.6A CN116951662A (en) | 2022-04-20 | 2022-04-20 | Method for detecting leakage position of refrigerant, storage medium and air conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08200871A (en) * | 1995-01-27 | 1996-08-06 | Matsushita Electric Ind Co Ltd | Air conditioner |
| JP2005241050A (en) * | 2004-02-24 | 2005-09-08 | Mitsubishi Electric Building Techno Service Co Ltd | Air conditioning system |
| CN112361541B (en) * | 2019-07-23 | 2022-06-24 | 青岛海尔空调电子有限公司 | Expansion valve control method for multi-split air conditioning system |
| CN111520870B (en) * | 2020-03-26 | 2022-05-10 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN112944586B (en) * | 2021-03-01 | 2023-11-24 | 青岛海尔空调电子有限公司 | Control method of multi-split air conditioning system |
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