CN113639402B - Refrigerant leakage detection and discharge method for air conditioner - Google Patents
Refrigerant leakage detection and discharge method for air conditioner Download PDFInfo
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- CN113639402B CN113639402B CN202110785934.0A CN202110785934A CN113639402B CN 113639402 B CN113639402 B CN 113639402B CN 202110785934 A CN202110785934 A CN 202110785934A CN 113639402 B CN113639402 B CN 113639402B
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 7
- NBNNDUZYMXBCOX-UHFFFAOYSA-N n-[4-[4-(4-methoxyphenoxy)-2,6-dimethylphenyl]-1,3-thiazol-2-yl]pyridine-4-carboxamide Chemical compound C1=CC(OC)=CC=C1OC(C=C1C)=CC(C)=C1C1=CSC(NC(=O)C=2C=CN=CC=2)=N1 NBNNDUZYMXBCOX-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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
-
- 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
-
- 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
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
-
- 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
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the technical field of air conditioners, in particular to a refrigerant leakage detection and discharge method of an air conditioner, and aims to solve the problems that the refrigerant leakage detection and judgment method of the existing air conditioner is single, misjudgment is easy to occur, the combustion of an outdoor power utilization part is easy to cause, and great potential safety hazards exist. For this purpose, the refrigerant leakage detecting and discharging method of the present invention comprises: in the running process of the air conditioner, the exhaust temperature of the compressor, the coil temperature of the indoor unit, the running frequency of the compressor and the outdoor environment temperature are obtained in real time; judging whether the air conditioner leaks refrigerant or not according to the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor environment temperature; under the condition that the air conditioner leaks refrigerant, the compressor is stopped and the exhaust fan is started after the set time. The invention can improve the accuracy of refrigerant leakage detection and judgment, and can discharge the refrigerant when the refrigerant leaks, thereby improving the safety of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant leakage detection and discharge method of an air conditioner.
Background
An air conditioner is a device capable of adjusting an indoor environment temperature, which can lower the indoor environment temperature by cooling and raise the indoor environment temperature by heating, thereby improving user comfort.
After the air conditioner operates for a long time, the problem that the refrigerant leaks is likely to occur, and the refrigerant leakage of the air conditioner not only can lead to the refrigerant in the circulating pipeline of the air conditioner to be reduced so as to influence the normal heat exchange of the air conditioner, but also can influence the operation of the air conditioner, in particular to the operation of the compressor.
In the prior art, the detection and judgment method of the air conditioner on refrigerant leakage is single, the possibility of misjudgment is very easy to occur, and if misjudgment occurs, the air conditioner can adjust the operation strategy due to misjudgment, so that the normal heat exchange of the air conditioner is affected, the comfort experience of a user is reduced, and the outdoor side is provided with various electricity utilization components, if refrigerant leakage occurs at the outdoor side, the electricity utilization components are easy to fire or burn during operation, and the personal safety is seriously threatened.
Therefore, there is a need in the art for a new refrigerant leakage detection and discharge method for an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems that the refrigerant leakage detection and judgment method of the existing air conditioner is single, misjudgment is easy to occur, the outdoor electricity utilization part is easy to burn, and great potential safety hazards exist.
The invention provides a refrigerant leakage detection and discharge method of an air conditioner, wherein an exhaust fan is arranged on a shell of an outdoor unit of the air conditioner;
the refrigerant leakage detection and discharge method comprises the following steps:
in the running process of the air conditioner, the exhaust temperature of the compressor, the coil temperature of the indoor unit, the running frequency of the compressor and the outdoor environment temperature are obtained in real time;
judging whether the air conditioner leaks refrigerant or not according to the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor environment temperature;
and under the condition that the air conditioner leaks refrigerant, stopping the compressor and starting the exhaust fan after the set time.
In the above preferred technical solution of the refrigerant leakage detection and discharge method, the step of determining whether the air conditioner has refrigerant leakage according to the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor, and the outdoor environment temperature specifically includes:
judging whether the difference between the exhaust temperature before the first preset time of the compressor and the exhaust temperature at the current time of the compressor is larger than or equal to a first set value, judging whether the difference between the coil temperature before the first preset time of the indoor unit and the coil temperature at the current time of the indoor unit is larger than or equal to a second set value, judging whether the difference between the operating frequency before the first preset time of the compressor and the operating frequency at the current time of the compressor is smaller than or equal to a third set value, judging whether the absolute value of the difference between the outdoor environment temperature before the first preset time and the outdoor environment temperature at the current time is smaller than a fourth set value, and judging whether the difference between the exhaust temperature at the current time of the compressor and the coil temperature at the current time of the indoor unit is larger than a fifth set value and lasts for the second preset time;
and judging whether the air conditioner leaks the refrigerant according to the judging result.
In the above preferred technical solution of the refrigerant leakage detection and discharge method, the step of determining whether the air conditioner has refrigerant leakage according to the determination result specifically includes:
if it is determined that the difference between the discharge temperature of the compressor before the first preset time and the discharge temperature of the compressor at the current time is greater than or equal to the first set value, and it is determined that the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value, and it is determined that the difference between the operating frequency of the compressor before the first preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and it is determined that the absolute value of the difference between the outdoor ambient temperature before the first preset time and the outdoor ambient temperature at the current time is less than the fourth set value, and it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than the fifth set value and the second preset time is continued, it is determined that refrigerant leakage occurs in the air conditioner.
In the above-described preferred embodiment of the refrigerant leakage detecting and discharging method, if it is determined that the difference between the discharge temperature before the first preset time of the compressor and the discharge temperature at the present time of the compressor is greater than or equal to the first set value, and it is determined that the difference between the coil temperature before the first preset time of the indoor unit and the coil temperature at the present time of the indoor unit is greater than or equal to the second set value, and it is determined that the difference between the operation frequency before the first preset time of the compressor and the operation frequency at the present time of the compressor is less than or equal to the third set value, and it is determined that the absolute value of the difference between the outdoor environment temperature before the first preset time and the outdoor environment temperature at the present time is less than the fourth set value, and it is determined that the difference between the discharge temperature at the present time of the compressor and the coil temperature at the present time of the indoor unit is greater than the fifth set value, and the second preset time is continued, the step of determining that the air conditioner is leaking "specifically includes:
if it is determined that the difference between the discharge temperature of the compressor before the first preset time and the discharge temperature of the compressor at the current time is greater than or equal to the first set value and that the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value and that the difference between the operating frequency of the compressor before the first preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value and that the absolute value of the difference between the outdoor ambient temperature before the first preset time and the outdoor ambient temperature at the current time is less than the fourth set value and that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than the fifth set value and that the second preset time is continued, it is determined that refrigerant leakage occurs in the air conditioner.
In the preferred technical scheme of the refrigerant leakage detection and discharge method, the first preset time and the second preset time are both 5 minutes, the first set value is 10 ℃, the second set value is-5 ℃, the third set value is 5HZ, the fourth set value is 2 ℃, and the fifth set value is 58 ℃.
In a preferred embodiment of the refrigerant leakage detecting and discharging method, the third preset time is 60 minutes.
In a preferred embodiment of the above refrigerant leakage detecting and discharging method, the step of "turning on the exhaust fan" is performed before the step of "stopping the compressor".
In a preferred embodiment of the above refrigerant leakage detecting and discharging method, the refrigerant leakage detecting and discharging method further includes:
and powering off the outdoor unit.
In a preferred embodiment of the above refrigerant leakage detecting and discharging method, after the step of stopping the compressor, the refrigerant leakage detecting and discharging method further includes:
and reducing the throttle valve of the air conditioner to a set opening degree.
In a preferred embodiment of the above refrigerant leakage detecting and discharging method, the refrigerant leakage detecting and discharging method further includes:
when the air conditioner is judged to have refrigerant leakage, the indoor unit is immediately stopped and an alarm prompt is sent out.
Under the condition of adopting the technical scheme, the invention can carry out combination judgment through the exhaust temperature of the compressor, the coil temperature of the indoor unit, the running frequency of the compressor and the outdoor environment temperature, namely, the parameters of the air conditioner and the parameters of the air conditioner are combined, so that the influence caused by the change of the outdoor environment temperature is reduced, meanwhile, the combination judgment is carried out by utilizing the parameters of the air conditioner which are most relevant to the leakage of the refrigerant, the accuracy of the detection judgment of the leakage of the refrigerant can be greatly improved, and once the leakage of the refrigerant is judged, the compressor is stopped and the exhaust fan is started, so that the refrigerant at the outer side can be discharged, the combustion of the electricity utilization part at the outer side caused by the leakage of the refrigerant is avoided, and the safety of the air conditioner is improved.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a refrigerant leakage detecting and discharging method of an air conditioner according to the present invention;
fig. 2 is a flowchart of an embodiment of a refrigerant leakage detecting and discharging method of an air conditioner according to the present invention.
Detailed Description
It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application.
It should be noted that, in the description of the present invention, although the respective steps of the control method of the present invention are described in a specific order in the present application, these orders are not limitative, and a person skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention. Furthermore, the terms "first," second, "" third, "" fourth, "and fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a refrigerant leakage detection and discharge method of an air conditioner, aiming at improving the accuracy of refrigerant leakage detection and judgment of the air conditioner, and enabling the refrigerant on the outer side of the air conditioner to be discharged when judging that the refrigerant leakage occurs, avoiding the combustion of the electric parts on the outer side of the air conditioner caused by the refrigerant leakage, and improving the safety of the air conditioner.
The air conditioner comprises an indoor unit, an outdoor unit, a compressor, a throttle valve and a four-way valve, wherein the indoor unit, the outdoor unit, the compressor and the throttle valve form a closed-loop refrigerant circulation system, the four-way valve can enable the air conditioner to switch between refrigeration and heating, an exhaust fan (the exhaust fan is not a fan of the outdoor fan and is independent of another fan of the outdoor fan) is arranged on a shell of the outdoor unit, a person skilled in the art can flexibly arrange the position of the exhaust fan in practical application, preferably, the exhaust fan is arranged on the shell at a position corresponding to the compressor, oil ways and electricity utilization components of the compressor are numerous, the exhaust fan is arranged at the position, which is beneficial to intensively exhausting the refrigerant when the refrigerant leaks, and of course, the exhaust fan can be arranged in a plurality of positions corresponding to each electricity utilization element on the outdoor side, and when the refrigerant leaks, all the exhaust fans are opened, so that the combustion risk of all the electricity utilization elements is reduced. The exhaust fan is connected with a controller of the air conditioner, and the start and stop of the exhaust fan are controlled by the controller.
Specifically, as shown in fig. 1, the refrigerant leakage detecting and discharging method of the present invention includes:
in the running process of the air conditioner, the exhaust temperature TD of the compressor, the coil temperature TM of the indoor unit, the running frequency F of the compressor and the outdoor environment temperature TAI are obtained in real time;
judging whether the air conditioner leaks a refrigerant or not according to the exhaust temperature TD of the compressor, the coil temperature TM of the indoor unit, the operating frequency F of the compressor and the outdoor environment temperature TAI;
under the condition that the air conditioner leaks refrigerant, the compressor is stopped and the exhaust fan is started after the set time.
In the above, the value range of the setting time is preferably 5 to 15 seconds, more preferably 10 seconds, and those skilled in the art can flexibly set the setting time in practical applications. According to repeated researches of the inventor, under the condition that the air conditioner just leaks the refrigerant, if the air conditioner immediately controls the compressor to stop, the whole air conditioner is in a serious unsteady state, the refrigerant leakage is aggravated at the moment, the air conditioner can stop in a relative steady state by stopping the compressor after a set time when the air conditioner fires, the refrigerant leakage is prevented from being aggravated, the stopping mode of the compressor preferably adopts uniform speed-down stopping or stepwise speed-down stopping in a stepped state, for example, stopping is completed within 10 to 15 seconds, and compared with the stopping speed of the air conditioner in a normal running state.
Preferably, the step of determining whether the air conditioner has refrigerant leakage according to the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit, the operating frequency F of the compressor, and the outdoor ambient temperature TAI specifically includes:
judging whether a difference DeltaTD between an exhaust temperature TD1 before a first preset time T1 of the compressor and an exhaust temperature TD2 at a current time of the compressor is larger than or equal to a first set value T1, judging whether a difference DeltaTM between a coil temperature TM1 before the first preset time T1 of the indoor unit and a coil temperature TM2 at the current time of the indoor unit is larger than or equal to a second set value T2, judging whether a difference DeltaF between an operating frequency F1 before the first preset time T1 of the compressor and an operating frequency F2 at the current time of the compressor is smaller than or equal to a third set value F3, judging whether an absolute value DeltaTAI of a difference between an outdoor environmental temperature TAI1 before the first preset time T1 and an outdoor environmental temperature TAI2 at the current time is smaller than a fourth set value T4, judging whether a difference TD-TM 2 between the exhaust temperature TD2 at the current time of the compressor and the coil temperature TM2 at the current time of the indoor unit is larger than a fifth set value T5 and continuously for the second preset time T2;
and judging whether the air conditioner leaks the refrigerant according to the judging result.
It should be noted that, among the parameters of the air conditioner itself (i.e., the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit, and the operating frequency F of the compressor), besides calculating the difference between the discharge temperature of the compressor, the operating frequency of the compressor, and the coil temperature of the indoor unit at the previous time and the current time, the comparison judgment between the difference TD2-TM2 between the discharge temperature TD2 of the compressor and the coil temperature TM2 of the indoor unit at the current time and the fifth set value T5 is designed, so as to avoid erroneous judgment caused by the abnormal operation of the compressor itself and the inaccurate detection of the coil temperature sensor of the indoor unit, that is, in extreme cases, the deviation of the discharge temperature and the operating frequency of the compressor at the previous time and the current time may occur, and the detection abnormality may occur due to the reason of the coil temperature of the indoor unit, but on the basis, the probability that the comparison condition between TD2-TM2 and T5 is required to be satisfied is substantially zero.
In a specific case, if it is determined that the difference Δtd between the discharge temperature TD1 before the first preset time T1 of the compressor and the discharge temperature TD2 at the current time of the compressor is greater than or equal to the first set value T1, and it is determined that the difference Δtm between the coil temperature TM1 before the first preset time T1 of the indoor unit and the coil temperature TM2 at the current time of the indoor unit is greater than or equal to the second set value T2, and it is determined that the difference Δf between the operating frequency F1 before the first preset time T1 of the compressor and the operating frequency F2 at the current time of the compressor is less than or equal to the third set value F3, and it is determined that the absolute value Δtai between the difference between the outdoor ambient temperature TAI1 before the first preset time T1 and the outdoor ambient temperature TAI2 at the current time is less than the fourth set value T4, and it is determined that the difference TD2-TM2 between the discharge temperature TD2 at the current time of the compressor and the coil temperature TM2 at the current time of the indoor unit is greater than the fifth set value T5 and the second preset time duration time, the air conditioner leaks refrigerant.
Further preferably, a time limit may be added to the conditions of Δtd being greater than or equal to T1, Δtm being greater than or equal to T2, Δf being greater than or equal to F3, Δtai being less than T4, and TD2-TM2 being greater than T5, that is, the conditions are met within the time limit to determine that the air conditioner has refrigerant leakage, so that the accuracy of detection is further improved, and through the test of the inventor, the possibility of misjudgment of the air conditioner is substantially zero under the conditions. That is, if it is determined that the difference Δtd between the discharge temperature TD1 before the first preset time T1 of the compressor and the discharge temperature TD2 at the current time of the compressor is greater than or equal to the first set value T1 and that the difference Δtm between the coil temperature TM1 before the first preset time T1 of the indoor unit and the coil temperature TM2 at the current time of the indoor unit is greater than or equal to the second set value T2 and that the difference Δf between the operating frequency F1 before the first preset time T1 of the compressor and the operating frequency F2 at the current time of the compressor is less than or equal to the third set value F3 and that the absolute value Δtai between the outdoor ambient temperature TAI1 before the first preset time T1 and the outdoor ambient temperature TAI2 at the current time is less than the fourth set value T4 and that the difference 2-TM2 between the discharge temperature TD2 at the current time of the compressor and the coil temperature TM2 at the current time of the indoor unit is greater than or equal to the fifth set value T5 and that the second preset time TD2 is greater than or equal to the absolute value Δtai is not less than the fourth set value T2 within the third preset time T3.
The specific values of the first preset time T1, the second preset time T2, the third preset time T3, the first set value T1, the second set value T2, the third set value F3, the fourth set value T4 and the fifth set value T5 can be flexibly set in practical applications by those skilled in the art, for example: the first preset time T1 and the second preset time T2 are both 5 minutes, the third preset time T3 is 60 minutes, the first set value T1 is 10 ℃, the second set value T2 is-5 ℃, the third set value F3 is 5HZ, the fourth set value T4 is 2 ℃, and the fifth set value T5 is 58 ℃.
Further, in the above, if ΔTD < T1, ΔTM < T2, ΔF > F3, ΔTAI.gtoreq.T4, TD2-TM 2.ltoreq.T5, or TD2-TM2 > T5 but for a second preset time T2, it is determined that the air conditioner does not leak the refrigerant.
Preferably, in the present invention, the aforementioned step of "turning on the exhaust fan" is performed prior to the step of "stopping the compressor".
Preferably, in addition to the step of stopping the compressor, the refrigerant leakage detecting and discharging method of the present invention further includes: the outdoor unit is powered off. When the air conditioner judges that the refrigerant leakage occurs, the air conditioner stops the compressor and simultaneously cuts off the power supply of the outdoor unit after a set time, so that the ignition or operation of the electric elements is avoided, the combustion of the electric elements is avoided, the safety of the air conditioner is further improved, in other words, the exhaust fan is started to discharge the refrigerant out of the outdoor unit, the outdoor unit is powered off to ensure that the electric elements are not ignited and operated, and the safety of the air conditioner is ensured from two aspects. Specifically, the outdoor unit may be powered off by powering off both the computer board and the module of the outdoor unit.
Preferably, after the step of stopping the compressor, the refrigerant leakage detecting and discharging method of the present invention further includes: the throttle valve of the air conditioner is reduced to a set opening degree. Specifically, after a fourth preset time for stopping the compressor, the throttle valves are reduced to the set opening degree, and it is preferable that all the throttle valves of the air conditioner are reduced to the set opening degree. Those skilled in the art can flexibly set the fourth preset time and the set opening in practical application, wherein the fourth preset time is preferably 30 seconds, and the set opening is preferably 5 steps, and of course, the fourth preset time and the set opening are only exemplary and do not limit the present invention.
Preferably, the refrigerant leakage detecting and discharging method of the present invention further comprises: when the air conditioner is judged to leak the refrigerant, the indoor unit is immediately stopped and an alarm prompt is sent out. When the air conditioner judges that the refrigerant leaks, the indoor unit can be stopped immediately, so that the refrigerant is prevented from flowing indoors, and meanwhile, the user can know the refrigerant in time by sending out an alarm prompt, and the delay of the moment of taking the corresponding measures is avoided. Specifically, the controller sends out an alarm prompt to the indoor unit, and then sends out a fault code, and then a fluorine deficiency fault is reported, or the indoor unit sends out a buzzing prompt, or the controller of the air conditioner communicates with a user terminal (such as a mobile phone, a tablet, a smart bracelet/watch, etc.), and then sends out prompt information to the user terminal. Specifically, a short message or an automatic push phone reminder can be sent to the user terminal, and a voice prompt can be sent to the user terminal, or the APP of the user terminal can automatically pop up the prompt information.
The technical solution of the present invention will be described below with reference to a specific embodiment.
As shown in fig. 2, during the operation of the air conditioner, the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit, the operation frequency F of the compressor, and the outdoor ambient temperature TAI are obtained in real time;
judging whether the difference DeltaTD between the discharge temperature of the compressor before 5 minutes and the current discharge temperature is more than or equal to 10 ℃ and whether the difference DeltaTM between the coil temperature of the indoor unit before 5 minutes and the current coil temperature is more than or equal to-5 ℃ within 60 minutes, whether the difference DeltaF between the operating frequency of the compressor before 5 minutes and the current operating frequency is less than or equal to 5HZ, whether the absolute value DeltaTAI between the difference between the outdoor environment temperature before 5 minutes and the current outdoor environment temperature is less than 2 ℃ (the influence of the outdoor environment temperature on refrigerant leakage judgment is eliminated), and whether the difference TD2-TM2 between the discharge temperature of the current compressor and the coil temperature of the indoor unit is more than 58 ℃ and has been continued for 5 minutes;
if the difference DeltaTD between the exhaust temperature of the compressor before 5 minutes and the current exhaust temperature is more than or equal to 10 ℃ within 60 minutes, the difference DeltaTM between the coil temperature of the indoor unit before 5 minutes and the current coil temperature is more than or equal to-5 ℃, the difference DeltaF between the operating frequency of the compressor before 5 minutes and the current operating frequency is less than or equal to 5HZ, the absolute value DeltaTAI between the difference DeltaTAI between the outdoor environment temperature before 5 minutes and the current outdoor environment temperature is less than 2 ℃, the difference TD between the exhaust temperature of the current compressor and the coil temperature of the indoor unit is 2-TM2 which is more than 58 ℃ and is continued for 5 minutes, judging whether the refrigerant leakage occurs to the air conditioner, if not, continuing judging whether the refrigerant leakage occurs to the air conditioner, stopping the indoor unit and alarming after judging that the refrigerant leakage occurs to the air conditioner, stopping the air conditioner, powering down the outdoor unit, starting the air conditioner, and reducing the opening of the throttle valve to 5 steps after 10 seconds.
In the invention, the sensor for detecting the outdoor environment temperature needs to ensure that the setting position of the sensor is not affected when the air conditioner leaks refrigerant, for example, the outdoor environment temperature sensor can be set far away from the air conditioner, at this time, the outdoor environment temperature sensor is only required to be communicated with the controller of the air conditioner, in addition, the outdoor environment temperature is preferably obtained through weather forecast, thereby avoiding the influence of the air conditioner on the outdoor environment temperature detection when the air conditioner leaks refrigerant.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (7)
1. The refrigerant leakage detecting and exhausting method for air conditioner features that the outdoor unit has exhaust fan set on the casing;
the refrigerant leakage detection and discharge method comprises the following steps:
in the running process of the air conditioner, the exhaust temperature of the compressor, the coil temperature of the indoor unit, the running frequency of the compressor and the outdoor environment temperature are obtained in real time;
judging whether the air conditioner leaks refrigerant or not according to the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor environment temperature;
under the condition that the air conditioner leaks refrigerant, stopping the compressor and starting the exhaust fan after a set time;
the step of determining whether the air conditioner has refrigerant leakage according to the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor environment temperature specifically includes:
judging whether the difference between the exhaust temperature before the first preset time of the compressor and the exhaust temperature at the current time of the compressor is larger than or equal to a first set value, judging whether the difference between the coil temperature before the first preset time of the indoor unit and the coil temperature at the current time of the indoor unit is larger than or equal to a second set value, judging whether the difference between the operating frequency before the first preset time of the compressor and the operating frequency at the current time of the compressor is smaller than or equal to a third set value, judging whether the absolute value of the difference between the outdoor environment temperature before the first preset time and the outdoor environment temperature at the current time is smaller than a fourth set value, and judging whether the difference between the exhaust temperature at the current time of the compressor and the coil temperature at the current time of the indoor unit is larger than a fifth set value and lasts for the second preset time; through the comparison and judgment of the difference value between the exhaust temperature of the current time of the compressor and the coil temperature of the current time of the indoor unit and the fifth set value, the abnormal operation of the compressor and the misjudgment caused by inaccurate detection of a coil temperature sensor of the indoor unit are avoided;
judging whether the air conditioner leaks refrigerant according to a judging result;
the step of judging whether the air conditioner leaks the refrigerant according to the judging result specifically comprises the following steps:
if it is determined that the difference between the discharge temperature before the first preset time of the compressor and the discharge temperature at the current time of the compressor is greater than or equal to the first set value, and it is determined that the difference between the coil temperature before the first preset time of the indoor unit and the coil temperature at the current time of the indoor unit is greater than or equal to the second set value, and it is determined that the difference between the operating frequency before the first preset time of the compressor and the operating frequency at the current time of the compressor is less than or equal to the third set value, and it is determined that the absolute value of the difference between the outdoor ambient temperature before the first preset time and the outdoor ambient temperature at the current time is less than the fourth set value, and it is determined that the difference between the discharge temperature at the current time of the compressor and the coil temperature at the current time of the indoor unit is greater than the fifth set value and the second preset time is continued, it is determined that refrigerant leakage occurs in the air conditioner;
the step of determining that refrigerant leakage of the air conditioner occurs may include, if it is determined that a difference between a discharge temperature of the compressor before a first preset time and a discharge temperature of the compressor at a current time is greater than or equal to the first set value, and it is determined that a difference between a coil temperature of the indoor unit before the first preset time and a coil temperature of the indoor unit at a current time is greater than or equal to the second set value, and it is determined that a difference between an operating frequency of the compressor before the first preset time and an operating frequency of the compressor at a current time is less than or equal to the third set value, and it is determined that an absolute value of a difference between an outdoor ambient temperature before the first preset time and an outdoor ambient temperature at a current time is less than the fourth set value, and it is determined that a difference between a discharge temperature of the compressor at a current time and a coil temperature of the indoor unit at a current time is greater than the fifth set value and continues for the second preset time:
if it is determined that the difference between the discharge temperature of the compressor before the first preset time and the discharge temperature of the compressor at the current time is greater than or equal to the first set value and that the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value and that the difference between the operating frequency of the compressor before the first preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value and that the absolute value of the difference between the outdoor ambient temperature before the first preset time and the outdoor ambient temperature at the current time is less than the fourth set value and that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than the fifth set value and that the second preset time is continued, it is determined that refrigerant leakage occurs in the air conditioner.
2. The refrigerant leakage detecting and discharging method according to claim 1, wherein the first preset time and the second preset time are each 5 minutes, the first set value is 10 degrees celsius, the second set value is-5 degrees celsius, the third set value is 5HZ, the fourth set value is 2 degrees celsius, and the fifth set value is 58 degrees celsius.
3. The refrigerant leakage detecting and discharging method according to claim 1, wherein the third preset time is 60 minutes.
4. The refrigerant leakage detecting and discharging method according to claim 1, wherein the step of turning on the exhaust fan is performed before the step of turning off the compressor.
5. The refrigerant leakage detecting and discharging method according to any one of claims 1 to 4, wherein, at the same time of the step of stopping the compressor, the refrigerant leakage detecting and discharging method further comprises:
and powering off the outdoor unit.
6. The refrigerant leakage detecting and discharging method according to any one of claims 1 to 4, further comprising, after the step of stopping the compressor:
and reducing the throttle valve of the air conditioner to a set opening degree.
7. The refrigerant leakage detecting and discharging method according to any one of claims 1 to 4, further comprising:
when the air conditioner is judged to have refrigerant leakage, the indoor unit is immediately stopped and an alarm prompt is sent out.
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| CN202110785934.0A CN113639402B (en) | 2021-07-12 | 2021-07-12 | Refrigerant leakage detection and discharge method for air conditioner |
| PCT/CN2022/097984 WO2023284458A1 (en) | 2021-07-12 | 2022-06-10 | Leakage detection and discharge method for refrigerant of air conditioner |
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| CN116025999A (en) * | 2023-01-28 | 2023-04-28 | 宁波奥克斯电气股份有限公司 | Air conditioner and refrigerant leakage detection method |
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