CN115614918A - Refrigerant shortage detection method and device for air conditioner and air conditioner - Google Patents
Refrigerant shortage detection method and device for air conditioner and air conditioner Download PDFInfo
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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
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F24F2110/00—Control inputs relating to air properties
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- F24F2110/12—Temperature of the outside air
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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
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Abstract
The invention discloses a refrigerant shortage detection method and device of an air conditioner and the air conditioner, and relates to the technical field of air conditioners, wherein the method comprises the following steps: when the air conditioner is detected to be stopped and the stop time of the air conditioner reaches a preset time, detecting the current real-time high-pressure and real-time low-pressure of a target outdoor unit; judging whether the target outdoor unit has a refrigerant shortage risk or not according to the real-time high-pressure; if yes, acquiring an operation mode of the air conditioner before the air conditioner is shut down, and judging whether the target outdoor unit has a one-way valve leakage fault or not based on the operation mode, the real-time high-pressure and the real-time low-pressure; and when the leakage fault of the one-way valve of the target outdoor unit is eliminated, determining that the target outdoor unit is in a refrigerant lack state currently. The invention can eliminate the pressure parameter abnormity caused by leakage failure of the one-way valve, avoid the misjudgment of refrigerant shortage and improve the accuracy of refrigerant shortage detection.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant shortage detection method and device of an air conditioner and the air conditioner.
Background
The multi-connected air conditioner generally comprises a plurality of indoor units and outdoor units, the installation environment is complex, connecting pipes between the outdoor units and the indoor units are more, the refrigerant leakage condition is difficult to avoid, the air conditioner is easy to damage when the air conditioner runs short of refrigerants, and the existing refrigerant-lacking detection technology of the air conditioner is generally in a preposed refrigerant identification state, such as refrigerant identification when the air conditioner is in a stop state, in order to avoid the damage of the air conditioner caused by the lack of refrigerants.
The existing refrigerant shortage detection technology generally judges the high pressure of the air conditioner, and triggers refrigerant shortage protection when the high pressure is lower than a threshold value, so that the air conditioner is protected and stopped. However, when other components in the air conditioner have problems (such as when the exhaust check valve leaks and the reverse seal is not tight), the high pressure is also low, and the refrigerant lack judgment is performed only by the high pressure, so that the refrigerant lack misjudgment is easy to occur.
Disclosure of Invention
In order to solve the problems, the invention provides a refrigerant shortage detection method and device for an air conditioner and the air conditioner, which can eliminate pressure parameter abnormity caused by leakage failure of a one-way valve, avoid refrigerant shortage misjudgment and improve the accuracy of refrigerant shortage detection.
According to an embodiment of the present invention, on the one hand, a refrigerant shortage detection method for an air conditioner is provided, which includes: when the air conditioner is detected to be stopped and the stop time of the air conditioner reaches a preset time length, detecting the current real-time high-pressure and real-time low-pressure of a target outdoor unit; judging whether the target outdoor unit has a refrigerant shortage risk or not according to the real-time high-pressure; if yes, acquiring an operation mode of the air conditioner before shutdown, and judging whether a one-way valve leakage fault exists in the target outdoor unit or not based on the operation mode, the real-time high-pressure and the real-time low-pressure; and when the leakage fault of the one-way valve of the target outdoor unit is eliminated, determining that the target outdoor unit is in a refrigerant lack state currently.
By adopting the technical scheme, whether the target outdoor unit has the refrigerant shortage risk or not is judged according to the real-time high pressure after the air conditioner stops for a period of time, so that whether the target outdoor unit has the refrigerant shortage possibility or not is judged, whether the one-way valve leakage fault exists or not is further judged when the target outdoor unit has the refrigerant shortage risk or not, the refrigerant shortage risk caused by the leakage failure of the one-way valve is eliminated, the refrigerant shortage misjudgment is avoided, and the accuracy of refrigerant shortage detection is improved.
Preferably, the step of determining whether the target outdoor unit has a risk of refrigerant shortage according to the real-time high pressure includes: acquiring the outdoor environment temperature when the shutdown time of the air conditioner reaches a preset time, and acquiring the saturation pressure P corresponding to the outdoor environment temperature da (ii) a Judging the real-time high pressure P d Whether or not P is satisfied d ＜P da -A, if yes, determining that the target outdoor unit is in a refrigerant-starved state or has a check valve leakage fault; wherein, A is a first preset threshold value.
By adopting the technical scheme, the relation between the high pressure and the saturation pressure corresponding to the outdoor environment temperature is judged, whether the target outdoor unit has the problem of refrigerant shortage or leakage of the one-way valve can be quickly and accurately judged, the failure scene of devices is comprehensively considered, and the problem of error protection caused by direct judgment of refrigerant shortage is avoided.
Preferably, the step of determining whether a leakage fault of a check valve exists in the target outdoor unit based on the operation mode, the real-time high pressure, and the real-time low pressure includes: when the operation mode is a refrigeration mode or a heating mode, the real-time high-pressure P is judged d And said real-time low pressure P s Whether or not P is satisfied d -P s If yes, determining to eliminate the leakage fault of the one-way valve of the target outdoor unit; wherein, B is a second preset threshold.
By adopting the technical scheme, the relation between the real-time high-pressure and the real-time low-pressure of the target outdoor unit after the air conditioner is stopped is judged, and the relation between the high-pressure side and the low-pressure side of the target outdoor unit can be determined, so that whether the target outdoor unit lacks a refrigerant or has a check valve leakage fault can be accurately judged, and the accuracy of refrigerant shortage detection is improved.
Preferably, the step of determining whether a leakage fault of a check valve exists in the target outdoor unit based on the operation mode, the real-time high pressure, and the real-time low pressure includes: when the operation mode is a refrigeration mode, acquiring the actually measured high pressure of the target outdoor unit when the air conditioner is stopped; judging the real-time high pressure P d And said measured high pressure P d0 Whether or not P is satisfied d ＞P d0 -C, if yes, determining to eliminate the target outdoor unit to have a check valve leakage fault; wherein C is a third preset threshold.
By adopting the technical scheme, the relation between the actually measured high-pressure when the air conditioner is stopped and the real-time high-pressure after the air conditioner is stopped for a period of time is judged, whether the target outdoor unit has a check valve leakage fault or not can be deduced according to the high-pressure change condition of the target outdoor unit after the air conditioner is stopped, and the refrigerant shortage detection accuracy caused by the failure of devices is eliminated.
Preferably, the air conditioner includes a plurality of outdoor units connected in parallel, and the step of determining whether a leakage fault of a check valve exists in the target outdoor unit based on the operation mode, the real-time high pressure, and the real-time low pressure includes: when the operation mode is a refrigeration mode, acquiring the maximum high-pressure in other outdoor units except the target outdoor unit when the shutdown time of the air conditioner reaches the preset time; judging the real-time high pressure P d And said maximum high pressure P dmax Whether or not P is satisfied d ＞P dmax -D, if yes, determining to eliminate the target outdoor unit having a check valve leakage fault; wherein D is a fourth preset threshold.
By adopting the technical scheme, under the condition that the air conditioner is a multi-split air conditioner, after the air conditioner stops for a period of time, the high-pressure pressures of the target outdoor unit and other outdoor units are compared, whether the target outdoor unit has leakage of the one-way valve can be accurately judged, so that the leakage fault of the one-way valve of the target outdoor unit can be eliminated, the outdoor unit lacking the refrigerant can be locked, and the influence on the use experience of a user due to the shortage of the refrigerant in the outdoor unit can be avoided.
Preferably, the step of determining whether a leakage fault of a check valve exists in the target outdoor unit based on the operation mode, the real-time high pressure, and the real-time low pressure includes: when the operation mode is a heating mode, acquiring the actually measured low-pressure of the target outdoor unit when the air conditioner is shut down; judging the real-time low pressure P s And said measured low pressure P s0 Whether or not P is satisfied s ＜P s0 + E, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein E is a fifth preset threshold.
By adopting the technical scheme, after the air conditioner is shut down in the heating operation, the relation between the actual measurement low-pressure when the target outdoor unit is shut down and the real-time low-pressure after the target outdoor unit is shut down for a period of time is judged, and the change condition of the low-pressure after the air conditioner is shut down in the heating operation can be obtained, so that whether the target outdoor unit has a check valve leakage fault or not can be accurately judged, pressure parameters under different time dimensions are comprehensively considered, and the accuracy of refrigerant shortage detection is improved.
Preferably, the air conditioner includes a plurality of outdoor units connected in parallel, and the step of determining whether a leakage fault of a check valve exists in the target outdoor unit based on the operation mode, the real-time high pressure, and the real-time low pressure includes: when the operation mode is a heating mode, acquiring the minimum low-pressure in other outdoor units except the target outdoor unit; judging the real-time low pressure P s And said minimum low pressure P smin Whether or not P is satisfied s ＞P smin + F, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein F is a sixth preset threshold.
By adopting the technical scheme, after the air conditioner is shut down in heating operation, the low-pressure pressures of the target outdoor unit and other outdoor units are compared, whether the refrigerant on the high-pressure side of the target outdoor unit is leaked to the low-pressure side or not can be accurately judged, the leakage fault of the check valve of the target outdoor unit can be eliminated, and the detection precision of the refrigerant lack is improved.
According to an embodiment of the present invention, another aspect provides a refrigerant shortage detection apparatus for an air conditioner, including: the detection module is used for detecting the current real-time high-pressure and real-time low-pressure of the target outdoor unit when the air conditioner is detected to be stopped and the stop time of the air conditioner reaches the preset time; the first judgment module is used for judging whether the target outdoor unit has a refrigerant shortage risk or not according to the real-time high pressure; the second judgment module is used for acquiring the operation mode of the air conditioner before the air conditioner is shut down when the target outdoor unit has a refrigerant shortage risk, and judging whether the target outdoor unit has a one-way valve leakage fault or not based on the operation mode, the real-time high-pressure and the real-time low-pressure; and the determining module is used for determining that the target outdoor unit is currently in a refrigerant-deficient state when the target outdoor unit is eliminated from having the leakage fault of the one-way valve.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioner including a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and when executed, implementing the method according to any one of the first aspect.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: whether the target outdoor unit has a refrigerant shortage risk or not is judged according to real-time high-pressure after the air conditioner is stopped for a period of time, so that whether the target outdoor unit has the refrigerant shortage possibility or not is judged, whether the one-way valve leakage fault exists or not is further judged when the target outdoor unit has the refrigerant shortage risk or not, the refrigerant shortage risk caused by the leakage failure of the one-way valve is eliminated, refrigerant shortage misjudgment is avoided, and the accuracy of refrigerant shortage detection is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flow chart of a refrigerant shortage detection method of an air conditioner according to the present invention;
fig. 2 is a schematic view illustrating an operation of an outdoor unit in a cooling mode according to the present invention;
fig. 3 is a schematic view illustrating an operation of an outdoor unit in a heating mode according to the present invention;
fig. 4 is a schematic structural diagram of a refrigerant shortage detection device of an air conditioner according to the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment provides a refrigerant shortage detection method for an air conditioner, which may be applied to an air conditioner, where the air conditioner may include one or more outdoor units, as shown in the flowchart of the refrigerant shortage detection method for the air conditioner shown in fig. 1, and the method mainly includes the following steps S102 to S108:
step S102: and when the air conditioner is detected to be stopped and the stop time of the air conditioner reaches the preset time, detecting the current real-time high-pressure and real-time low-pressure of the target outdoor unit.
The target outdoor unit is the outdoor unit of the air conditioner, when the air conditioner stops, the time of the air conditioner is counted based on the timer, whether the time of the air conditioner stopping reaches the preset time is judged in real time, when the time of the air conditioner stopping reaches the preset time, the air conditioner starts to be judged lack of refrigerant, and the high pressure and the low pressure of the target outdoor unit are respectively detected based on the pressure sensor when the air conditioner stopping reaches the preset time and are respectively recorded as real-time high pressure and real-time low pressure. The value range of the preset duration can be 2-8 h.
Step S104: and judging whether the target outdoor unit has a refrigerant shortage risk or not according to the real-time high pressure.
The inventor researches and discovers that if the outdoor unit has a leakage fault of the one-way valve, the reverse sealing is not tight, and after the air conditioner stops in a refrigeration mode, the high-pressure side to the low-pressure side of the outdoor unit are in a conduction state, so that the high-pressure is continuously reduced.
Whether the target outdoor unit has a refrigerant shortage risk or not can be judged according to the real-time high-pressure after the air conditioner is shut down, whether the real-time high-pressure is smaller than a certain threshold value or not is judged, if the real-time high-pressure of the target outdoor unit is lower after the air conditioner is shut down, the target outdoor unit is possibly in a refrigerant shortage state or a one-way valve leakage fault is possibly generated, namely the target outdoor unit has a certain probability that the target outdoor unit is in the refrigerant shortage state, and the target outdoor unit is determined to have the refrigerant shortage risk.
Step S106: if yes, obtaining the operation mode of the air conditioner before the air conditioner is shut down, and judging whether the target outdoor unit has the leakage fault of the one-way valve or not based on the operation mode, the real-time high-pressure and the real-time low-pressure.
When the target outdoor unit is determined to have the refrigerant shortage risk, namely, the target outdoor unit is in a refrigerant shortage state or a check valve leakage fault occurs. It is necessary to further eliminate whether the target outdoor unit has a leakage failure of the check valve.
Referring to the schematic diagram of the operation of the outdoor unit in the cooling mode as shown in fig. 2, the outdoor unit 20 includes a compressor 21, a heat exchanger 22, a check valve 23, an oil component 24, an oil return capillary tube 25, and a four-way valve 26.
The inventor researches and discovers that if the leakage of the check valve of the outdoor unit is not tight, the pressure of the high-pressure side refrigerant is high after the air conditioner is stopped in the cooling mode, the refrigerant flows along the arrow direction in fig. 2, the high-pressure side refrigerant passes through the check valve → oil return capillary tube → low-pressure side, finally, the refrigerant at the high pressure side is pumped away, the high pressure is equal to the low pressure side, so that the high pressure is lower, the high pressure of the outdoor unit with the leakage fault of the check valve is continuously reduced after the outdoor unit is shut down until the high pressure is balanced with the low pressure, and the high pressure is obviously lower than the high pressure of the normal outdoor unit.
If the check valve of the outdoor unit leaks and is not tightly sealed in the reverse direction, when the air conditioner operates in the heating mode, referring to the operation schematic diagram of the outdoor unit in the heating mode shown in fig. 3, the high-pressure side of the outdoor unit in fig. 3 is indicated by a line segment-shaped dotted line, and the low-pressure side is indicated by a dotted line, after the air conditioner operates and stops in the heating mode, the high-pressure side is in a conduction state to the low-pressure side, after the heating stops, the four-way valve is controlled in a power-failure-free mode, the pressure of the refrigerant at the high-pressure side is high and can pass through the check valve → oil return capillary tube → the low-pressure side, the refrigerant at the high-pressure side is discharged to the low-pressure side of the failed outdoor unit, and the low-pressure of the outdoor unit with the check valve leakage fault is obviously higher than the low-pressure of the normal outdoor unit.
The change conditions of the high pressure and the low pressure of the air conditioner after the air conditioner is shut down in different operation modes are different when the target outdoor unit is in a refrigerant shortage risk, and the real-time high pressure and the real-time low pressure after the air conditioner is shut down are judged according to the operation mode of the air conditioner before the air conditioner is shut down so as to judge whether the target outdoor unit has the problem of leakage of the one-way valve.
Step S108: and when the leakage fault of the one-way valve of the target outdoor unit is eliminated, determining that the target outdoor unit is in a refrigerant lack state currently.
When the leakage fault of the check valve of the target outdoor unit is eliminated, that is, the leakage fault of the check valve of the target outdoor unit is determined, it can be determined that the high-pressure change of the target outdoor unit is caused by the lack of the refrigerant, and the target outdoor unit is determined to be in the refrigerant lack state. And the target outdoor unit is controlled to display a refrigerant-lack fault code to remind a user of performing refrigerant-lack maintenance, and the target outdoor unit is controlled to prohibit starting so as to prevent the target outdoor unit from being damaged due to the operation of the refrigerant lack.
According to the refrigerant shortage detection method of the air conditioner, whether the target outdoor unit has a refrigerant shortage risk or not is judged according to the real-time high pressure after the air conditioner is stopped for a period of time, so that whether the target outdoor unit has the refrigerant shortage possibility or not is judged, whether the one-way valve leakage fault exists or not is further judged when the target outdoor unit has the refrigerant shortage risk or not, the refrigerant shortage risk caused by the leakage failure of the one-way valve is eliminated, the refrigerant shortage misjudgment is avoided, and the refrigerant shortage detection accuracy is improved.
In one embodiment, in order to quickly and accurately determine whether the target outdoor unit has a refrigerant shortage risk, the present embodiment provides a specific implementation manner of determining whether the target outdoor unit has a refrigerant shortage risk according to the real-time high pressure: acquiring the outdoor environment temperature when the shutdown time of the air conditioner reaches the preset time, and acquiring the saturation pressure P corresponding to the outdoor environment temperature da (ii) a Determining real-time high pressure P d Whether or not P is satisfied d ＜P da If yes, determining that the target outdoor unit is in a refrigerant shortage state or a check valve leakage fault exists; wherein, A is a first preset threshold value. A is a value range of [0.2,1 ] of a first preset threshold value]MPa。
The inventor researches and discovers that the high-pressure side refrigerant in the outdoor unit is in a gas-liquid state under normal conditions, the high-pressure is close to the saturation pressure corresponding to the outdoor environment temperature, and when the refrigerant in the outdoor unit is too little or leaks from the high pressure, the high-pressure is obviously lower than the saturation pressure.
Detecting the outdoor environment temperature in real time based on a temperature sensor, acquiring the outdoor environment temperature of the air conditioner in the preset shutdown time period, converting the outdoor environment temperature into corresponding saturation pressure, and judging whether the real-time high-pressure of the air conditioner in the preset shutdown time period meets the requirement of P d ＜P da And A, if the target outdoor unit is in the refrigerant-deficient state or has a leakage fault of the one-way valve, indicating that the target outdoor unit has a refrigerant leakage risk.
By judging the relation between the high pressure and the saturation pressure corresponding to the outdoor environment temperature, whether the target outdoor unit has the problem of refrigerant shortage or leakage of the check valve can be judged quickly and accurately, the failure scene of devices is comprehensively considered, and the problem of error protection caused by direct judgment of refrigerant shortage is avoided.
In one embodiment, in order to accurately determine whether the air conditioner has the check valve leakage fault in different operation modes, the present embodiment provides various embodiments for determining whether the target outdoor unit has the check valve leakage fault based on the operation mode, the real-time high pressure, and the real-time low pressure:
the first implementation mode comprises the following steps: when the operation mode is a refrigeration mode or a heating mode, the real-time high-pressure P is judged d And real-time low pressure P s Whether or not P is satisfied d -P s If yes, determining to eliminate the leakage fault of the one-way valve of the target outdoor unit; wherein B is a second preset threshold, and the value range of the second preset threshold B is [0.3, 1']MPa。
After the air conditioner is operated and stopped in a heating mode or a cooling mode, judging the real-time high-pressure P of a target outdoor unit after the air conditioner is stopped for a preset time d And real-time low pressure P s Whether or not P is satisfied d -P s If the pressure difference is more than B, the high pressure of the target outdoor unit is obviously higher than the low pressure, the high pressure side and the low pressure side are not communicated, the target outdoor unit does not have a check valve leakage fault, the problem that the target outdoor unit has check valve leakage is solved, and the fact that the high pressure of the target outdoor unit is obviously lower than the saturation pressure due to lack of refrigerant is further determinedIn (1).
By judging the relation between the real-time high-pressure and the real-time low-pressure of the target outdoor unit after the air conditioner is stopped, the relation between the high-pressure side and the low-pressure side of the target outdoor unit can be determined, so that whether the target outdoor unit lacks refrigerants or has a check valve leakage fault can be accurately judged, and the accuracy of refrigerant shortage detection is improved.
The second embodiment: when the operation mode is a refrigeration mode, acquiring the actually measured high pressure of the target outdoor unit when the air conditioner is stopped; determine real-time high pressure P d And measuring the high pressure P d0 Whether or not P is satisfied d ＞P d0 -C, if yes, determining to eliminate the target outdoor unit having the check valve leakage fault; wherein C is a third preset threshold, and the value range of the third preset threshold may be [0.1,0.6 ]]MPa。
After the air conditioner is operated and shut down in a refrigeration mode, the high-pressure of the target outdoor unit detected by the pressure sensor when the air conditioner is shut down is obtained and recorded as the actually-measured high-pressure, and the real-time high-pressure P of the target outdoor unit after the preset time of the air conditioner shutdown is judged d And measuring the high pressure P d0 Whether or not P is satisfied d ＞P d0 And C, if the pressure value is met, the high-pressure is not obviously reduced after the air conditioner stops for a period of time, the high-pressure side pressure is not leaked to the low-pressure side, the target outdoor unit does not have the leakage fault of the one-way valve, and the problem that the target outdoor unit has the leakage fault of the one-way valve is solved.
By judging the relation between the actually measured high-pressure when the air conditioner is stopped and the real-time high-pressure after the air conditioner is stopped for a period of time, whether the target outdoor unit has a check valve leakage fault or not can be deduced according to the high-pressure change condition of the target outdoor unit after the air conditioner is stopped, and the refrigerant lack detection accuracy caused by the failure of devices is eliminated.
The third implementation mode comprises the following steps: if the air conditioner comprises a plurality of outdoor units connected in parallel, when the operation mode is a refrigeration mode, acquiring the maximum high-pressure in other outdoor units except the target outdoor unit when the shutdown time of the air conditioner reaches the preset time; determine real-time high pressure P d And maximum high pressure P dmax Whether or not toSatisfy P d ＞P dmax D, if yes, determining that the target outdoor unit is excluded from the leakage fault of the one-way valve; wherein, D is a fourth preset threshold, and the value range of the fourth preset threshold can be [0.1,0.6 ]]MPa。
The target outdoor unit may be any one of a plurality of outdoor units connected in parallel, and after the air conditioner operates in the cooling mode and stops for a preset time, the high pressure of the target outdoor unit is obtained and recorded as the real-time high pressure P d Obtaining the high pressure of other outdoor units except the target outdoor unit at the moment, and selecting the maximum value from the high pressure as the maximum high pressure P dmax To determine the real-time high pressure P d And maximum high pressure P dmax Whether or not P is satisfied d ＞P dmax And D, if the real-time high pressure of the target outdoor unit is met, the difference between the current real-time high pressure of the target outdoor unit and the current high pressure of other outdoor units is smaller, a refrigerant on the high pressure side of the target outdoor unit is not leaked to the low pressure side, the target outdoor unit does not have a check valve leakage fault, and the problem that the target outdoor unit has the check valve leakage fault is solved.
By considering the condition that the air conditioner is a multi-connected air conditioner, after the air conditioner stops for a period of time, the high-pressure pressures of the target outdoor unit and other outdoor units are compared, whether the target outdoor unit is leaked by the check valve can be accurately judged, so that the leakage fault of the check valve of the target outdoor unit is eliminated, the outdoor unit lacking the refrigerant is locked, and the influence on the use experience of a user due to the fact that the outdoor unit lacks the refrigerant is avoided.
The fourth implementation mode comprises the following steps: when the operation mode is a heating mode, acquiring the actually measured low-pressure of the target outdoor unit when the air conditioner is shut down; determining real-time low pressure P s And the measured low pressure P s0 Whether or not P is satisfied s ＜P s0 + E, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein E is a fifth preset threshold, and the value range of the fifth preset threshold may be [0.1,1]MPa。
When the air conditioner runs in a heating mode and stops, the low-pressure of the target outdoor unit detected by the pressure sensor when the air conditioner stops is obtained and recorded as the actual measurement low-pressure, and when the air conditioner stops for a preset time length, the base is used for calculating the actual measurement low-pressureDetecting the current low pressure of the target outdoor unit by the pressure sensor, recording the current low pressure as real-time low pressure, and judging the real-time low pressure P s And the measured low pressure P s0 Whether or not P is satisfied s ＜P s0 And E, if the sum is met, the low-pressure is not obviously increased after the air conditioner is stopped for a period of time, the high-pressure side and the low-pressure side are not communicated, the one-way valve of the target outdoor unit does not have leakage faults, and the problem that the target outdoor unit has the one-way valve leakage faults is solved.
After the air conditioner is shut down in a heating operation mode, the relation between the actual measurement low-pressure when the target outdoor unit is shut down and the real-time low-pressure after the target outdoor unit is shut down for a period of time is judged, and the change condition of the low-pressure after the air conditioner is shut down in a heating mode can be obtained, so that whether the target outdoor unit has a check valve leakage fault or not can be accurately judged, pressure parameters under different time dimensions are comprehensively considered, and the accuracy of refrigerant shortage detection is improved.
The fifth embodiment: when the operation mode is the heating mode, acquiring the minimum low-pressure in other outdoor units except the target outdoor unit; determine real-time low pressure P s And a minimum low pressure P smin Whether or not P is satisfied s ＞P smin + F, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein F is a sixth preset threshold, and the value range of the sixth preset threshold F may be [0.2,1]MPa。
The target outdoor unit can be any one of a plurality of outdoor units connected in parallel, and after the air conditioner operates in a heating mode and stops for a preset time, the low-pressure of the target outdoor unit is obtained and recorded as a real-time high-pressure P s Obtaining the low pressure of other outdoor units except the target outdoor unit at the moment, and selecting the maximum value from the low pressure as the minimum low pressure P smin Judging the real-time low pressure P s And a minimum low pressure P smin Whether or not P is satisfied s ＞P smin And if the sum is satisfied, the low-pressure of the target outdoor unit is close to the low-pressure pressures of other outdoor units after the air conditioner is stopped for a period of time in heating, the refrigerant on the high-pressure side of the target outdoor unit is not leaked to the low-pressure side, the target outdoor unit does not have the leakage fault of the one-way valve, and the leakage fault of the one-way valve is eliminatedThe problem that the target outdoor unit has a leakage fault of the one-way valve is solved.
After the air conditioner is shut down in heating operation, the low-pressure pressures of the target outdoor unit and other outdoor units are compared, whether the refrigerant on the high-pressure side of the target outdoor unit leaks to the low-pressure side or not can be accurately judged, the leakage fault of the check valve of the target outdoor unit can be eliminated, and the detection precision of the refrigerant lack is improved.
According to the refrigerant shortage detection method of the air conditioner, when the outdoor unit is judged to be possibly in a refrigerant shortage state, the high pressure and the low pressure at different time are judged, whether the outdoor unit has a check valve leakage fault or not can be further eliminated, the condition that the system high pressure is lower than the saturation pressure due to failure of a device is considered, the accuracy of refrigerant shortage detection is ensured, the normal use of a user is prevented from being influenced due to error protection of the refrigerant shortage, and the use experience of the user is improved.
Corresponding to the refrigerant shortage detection method of the air conditioner provided by the embodiment, the embodiment of the invention provides an example of judging the refrigerant shortage of the air conditioner in the shutdown state by applying the refrigerant shortage detection method of the air conditioner, and the method can be specifically executed by referring to the following steps:
step 1, detecting parameters.
Detecting the actual measured high pressure P when the air conditioner is shut down d0 And the measured low pressure P s0 When the air conditioner is stopped for 2-8 h, the real-time high-pressure P is detected d Real-time low pressure P s And outdoor environment temperature, converting the outdoor environment temperature into corresponding saturation pressure P da (ii) a When the air conditioner includes a plurality of outdoor units connected in parallel, a maximum high pressure P in the other outdoor units is detected dmax And a minimum low pressure P smin 。
Step 2, judging conditions:
and in the refrigeration mode, after the air conditioner is stopped for 2-8 h, if the conditions (1) and (2) are simultaneously met, the condition that the refrigerant is lacked is judged.
①、P d ＜P da -a; recommended value range of A [0.2,1]MPa, in general, the high pressure side should be in a gas-liquid two-phase state, and the high pressure should correspond to the ring temperatureThe saturation pressure is equal, and when the refrigerant is too little or leaks with high pressure, the high pressure is obviously lower than the saturation pressure.
(2) Satisfies any one of the following conditions, and eliminates leakage of the check valve
P d -P s B is greater than the total weight of the steel; recommended value range of B [0.3,1]And MPa, pressure abnormity indicates that the one-way valve has leakage, and the condition mainly judges that the high pressure and the low pressure are not communicated, the high pressure is obviously higher than the low pressure, and leakage factors are eliminated.
Or P d ＞P d0 -C; recommended value range of C [0.1,0.6]And in MPa, after the machine is stopped according to the judgment of the condition, the high pressure is not obviously reduced, and the condition shows that the refrigerant at the high pressure side does not leak to the low pressure side.
Or P d ＞P dmax -D; recommended value range of D [0.1,0.6]And MPa, comparing the high pressure of different outdoor unit modules under the condition, and if the difference between the high pressure of the current outdoor unit and the high pressure of the normal outdoor unit is not large, indicating that the high pressure of the current outdoor unit does not leak to the low-pressure side.
The condition (1) can judge that the system lacks the refrigerant or the refrigerant on the high-pressure side leaks to the low-pressure side, and the condition (2) eliminates the leakage of the high-pressure side to the low-pressure side and locks the refrigerant shortage.
And in the heating mode, after the air conditioner is stopped for 2-8 hours, judging that the refrigerant is deficient when the conditions (3) and (4) are simultaneously met.
③、P d ＜P da -a; recommended value range of A [0.2,1]And MPa, in general, the high-pressure side is in a gas-liquid two-phase state, the high pressure is equal to the saturation pressure corresponding to the ring temperature, and when the refrigerant is too little or the refrigerant leaks from the high pressure, the high pressure is obviously lower than the saturation pressure.
(4) Satisfies any one of the following conditions, and eliminates the leakage of the check valve
P d -P s More than B; recommended value range of B [0.3,1]And MPa, pressure abnormity indicates leakage, the condition mainly judges the condition that high pressure and low pressure are not communicated, the high pressure is obviously higher than the low pressure, and leakage factors are eliminated.
Or P s ＜P s0 + E; recommended value range of E [0.1,1]MPa, the high pressure side of different external machine modules is communicated and the low pressure side is not communicated during heating, whenAfter the one-way valve leaks, the high pressure and the low pressure are communicated, the low pressure is increased, and the condition judges that the low pressure is not obviously increased, thereby eliminating the refrigerant leakage condition.
Or P s ＞P smin +F；P smin The recommended value range of F is 0.2,1 for the minimum outdoor unit low voltage in the parallel system]And MPa, comparing the low pressure of different outer machine modules under the condition, and eliminating the high-low pressure leakage condition of the current outer machine if the low pressure of the current outer machine is equivalent to the low pressure of the normal outer machine.
The condition (3) judges that the system lacks the refrigerant or the high-pressure side refrigerant leaks to the low-pressure side, and the condition (4) eliminates the leakage of the high-pressure side to the low-pressure side and locks the lack of the refrigerant.
Corresponding to the refrigerant shortage detection method of the air conditioner provided by the above embodiment, the embodiment of the invention provides a refrigerant shortage detection device of the air conditioner, which can be applied to the air conditioner, referring to the structural schematic diagram of the refrigerant shortage detection device of the air conditioner shown in fig. 4, the device comprises the following modules:
and the detection module 41 is configured to detect a current real-time high pressure and a current real-time low pressure of the target outdoor unit when it is detected that the air conditioner is stopped and the stop duration of the air conditioner reaches a preset duration.
The first determining module 42 is configured to determine whether there is a risk of refrigerant shortage in the target outdoor unit according to the real-time high pressure.
The second determining module 43 is configured to, when the target outdoor unit is in a risk of lacking a refrigerant, obtain an operation mode of the air conditioner before shutdown, and determine whether a leakage fault of the check valve exists in the target outdoor unit based on the operation mode, the real-time high pressure, and the real-time low pressure.
And the determining module 44 is configured to determine that the target outdoor unit is currently in a refrigerant-deficient state when the check valve leakage fault of the target outdoor unit is eliminated.
The lack refrigerant detection device of above-mentioned air conditioner that this embodiment provided judges whether target off-premises station has the lack refrigerant risk according to real-time high pressure after the air conditioner shuts down a period to judge whether target off-premises station has the possibility of lacking the refrigerant, further judge whether there is the check valve to reveal the trouble through when target off-premises station has the lack refrigerant risk, reveal the lack refrigerant risk that the inefficacy leads to with the exclusion check valve, avoid appearing lacking the refrigerant erroneous judgement, promoted the accuracy that lacks the refrigerant and detect.
In an embodiment, the first determining module 42 is further configured to obtain an outdoor environment temperature when the shutdown time of the air conditioner reaches a preset time, and obtain a saturation pressure P corresponding to the outdoor environment temperature da (ii) a Determining real-time high pressure P d Whether or not P is satisfied d ＜P da A, if yes, determining that the target outdoor unit is in a refrigerant shortage state or a check valve leakage fault exists; wherein, A is a first preset threshold value.
In an embodiment, the second determining module 43 is further configured to determine the real-time high pressure P when the operation mode is the cooling mode or the heating mode d And real-time low pressure P s Whether or not P is satisfied d -P s If yes, determining to eliminate the leakage fault of the one-way valve of the target outdoor unit; wherein, B is a second preset threshold.
In an embodiment, the second determining module 43 is further configured to, when the operation mode is the cooling mode, obtain an actually measured high pressure of the target outdoor unit when the air conditioner is stopped; determining real-time high pressure P d And measuring the high pressure P d0 Whether or not P is satisfied d ＞P d0 If yes, determining to eliminate the leakage fault of the check valve of the target outdoor unit; wherein C is a third preset threshold.
In an embodiment, the second determining module 43 is further configured to, when the operation mode is the cooling mode, obtain a maximum high pressure in the outdoor units except the target outdoor unit when the shutdown duration of the air conditioner reaches a preset duration; determining real-time high pressure P d And maximum high pressure P dmax Whether or not P is satisfied d ＞P dmax D, if yes, determining that the target outdoor unit is excluded from the leakage fault of the one-way valve; wherein D is a fourth preset threshold.
In one embodiment, the second determining module 43 is further configured to determine whether the operation mode is the heating modeAcquiring the actually measured low-pressure of the target outdoor unit when the air conditioner is shut down; determine real-time low pressure P s And measuring the low pressure P s0 Whether or not P is satisfied s ＜P s0 + E, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein E is a fifth preset threshold.
In an embodiment, the second determining module 43 is further configured to obtain a minimum low pressure in the outdoor units other than the target outdoor unit when the operation mode is the heating mode; determine real-time low pressure P s And a minimum low pressure P smin Whether or not P is satisfied s ＞P smin + F, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein F is a sixth preset threshold.
The refrigerant lack detection device of above-mentioned air conditioner that this embodiment provided, through when judging to obtain that the off-premises station probably lacks the refrigerant, judge high pressure and low pressure under the different times, can further get rid of whether the off-premises station has a check valve to reveal the trouble, consider that the device became invalid the system high pressure that leads to and be less than the condition of saturation pressure, ensured the accuracy that lacks the refrigerant and detected, avoid appearing lacking refrigerant mistake protection and influence user's normal use, promoted user's use and experienced.
Corresponding to the refrigerant shortage detection method of the air conditioner provided by the above embodiment, the embodiment provides an air conditioner, which includes a computer readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, the refrigerant shortage detection method of the air conditioner provided by the above embodiment is implemented.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the refrigerant shortage detection method of the air conditioner, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art can understand that all or part of the processes in the methods according to the above embodiments may be implemented by instructing a control device to implement the methods according to the above embodiments by a computer, and the program may be stored in a computer-readable storage medium, and when executed, the program may include the processes according to the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, or the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The refrigerant shortage detection device of the air conditioner and the air conditioner disclosed by the embodiment correspond to the refrigerant shortage detection method of the air conditioner disclosed by the embodiment, so that the description is relatively simple, and related parts can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (10)
1. A refrigerant shortage detection method of an air conditioner is characterized by comprising the following steps:
when the air conditioner is detected to be stopped and the stop time of the air conditioner reaches a preset time length, detecting the current real-time high-pressure and real-time low-pressure of a target outdoor unit;
judging whether the target outdoor unit has a refrigerant shortage risk or not according to the real-time high-pressure;
if yes, acquiring an operation mode of the air conditioner before shutdown, and judging whether a one-way valve leakage fault exists in the target outdoor unit or not based on the operation mode, the real-time high-pressure and the real-time low-pressure;
and when the target outdoor unit is eliminated from having the leakage fault of the one-way valve, determining that the target outdoor unit is currently in a refrigerant lack state.
2. The method as claimed in claim 1, wherein the step of determining whether the target outdoor unit is at risk of refrigerant shortage according to the real-time high pressure comprises:
obtaining an outdoor environment when the shutdown time of the air conditioner reaches a preset timeThe temperature is obtained, and the saturation pressure P corresponding to the outdoor environment temperature is obtained da ；
Judging the real-time high pressure P d Whether or not P is satisfied d ＜P da If yes, determining that the target outdoor unit is in a refrigerant shortage state or a check valve leakage fault exists; wherein, A is a first preset threshold value.
3. The method for detecting refrigerant shortage of an air conditioner according to claim 1, wherein the step of determining whether or not the target outdoor unit has a leakage fault of the check valve based on the operation mode, the real-time high pressure, and the real-time low pressure comprises:
when the operation mode is a refrigeration mode or a heating mode, the real-time high-pressure P is judged d And said real-time low pressure P s Whether or not P is satisfied d -P s If yes, determining to eliminate the leakage fault of the one-way valve of the target outdoor unit; wherein, B is a second preset threshold.
4. The refrigerant shortage detecting method of claim 1, wherein the step of determining whether the target outdoor unit has a check valve leakage fault based on the operation mode, the real-time high pressure, and the real-time low pressure comprises:
when the operation mode is a refrigeration mode, acquiring the actually measured high pressure of the target outdoor unit when the air conditioner is shut down;
judging the real-time high pressure P d And said measured high pressure P d0 Whether or not P is satisfied d ＞P d0 -C, if yes, determining to eliminate the target outdoor unit to have a check valve leakage fault; wherein C is a third preset threshold.
5. The refrigerant shortage detection method of claim 1, wherein the air conditioner comprises a plurality of outdoor units connected in parallel, and the step of determining whether the target outdoor unit has a check valve leakage fault based on the operation mode, the real-time high pressure and the real-time low pressure comprises:
when the operation mode is a refrigeration mode, acquiring the maximum high-pressure in other outdoor units except the target outdoor unit when the shutdown time of the air conditioner reaches the preset time;
judging the real-time high pressure P d And said maximum high pressure P dmax Whether or not P is satisfied d ＞P dmax -D, if yes, determining to eliminate the target outdoor unit having a check valve leakage fault; wherein D is a fourth preset threshold.
6. The method for detecting refrigerant shortage of an air conditioner according to claim 1, wherein the step of determining whether or not the target outdoor unit has a leakage fault of the check valve based on the operation mode, the real-time high pressure, and the real-time low pressure comprises:
when the operation mode is a heating mode, acquiring the actually measured low-pressure of the target outdoor unit when the air conditioner is shut down;
determining the real-time low pressure P s And said measured low pressure P s0 Whether or not P is satisfied s ＜P s0 + E, if yes, determining to eliminate the one-way valve leakage fault of the target outdoor unit; wherein E is a fifth preset threshold.
7. The refrigerant shortage detection method of claim 1, wherein the air conditioner comprises a plurality of outdoor units connected in parallel, and the step of determining whether the target outdoor unit has a check valve leakage fault based on the operation mode, the real-time high pressure and the real-time low pressure comprises:
when the operation mode is a heating mode, acquiring the minimum low-pressure in other outdoor units except the target outdoor unit;
judging the real-time low pressure P s And said minimum low pressure P smin Whether or not P is satisfied s ＞P smin + F, if yes, determining the rankExcept that the target outdoor unit has a one-way valve leakage fault; wherein F is a sixth preset threshold.
8. A refrigerant lack detection device of an air conditioner is characterized by comprising:
the detection module is used for detecting the current real-time high-pressure and real-time low-pressure of the target outdoor unit when the air conditioner is detected to be stopped and the stop time of the air conditioner reaches the preset time;
the first judgment module is used for judging whether the target outdoor unit has a refrigerant shortage risk or not according to the real-time high pressure;
the second judgment module is used for acquiring an operation mode of the air conditioner before shutdown when the target outdoor unit has a refrigerant shortage risk, and judging whether the target outdoor unit has a check valve leakage fault or not based on the operation mode, the real-time high pressure and the real-time low pressure;
and the determining module is used for determining that the target outdoor unit is currently in a refrigerant lack state when the target outdoor unit is eliminated from having the leakage fault of the one-way valve.
9. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
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