CN110940047B - Refrigerant leakage detection method and air conditioner - Google Patents

Refrigerant leakage detection method and air conditioner Download PDF

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CN110940047B
CN110940047B CN201811109755.XA CN201811109755A CN110940047B CN 110940047 B CN110940047 B CN 110940047B CN 201811109755 A CN201811109755 A CN 201811109755A CN 110940047 B CN110940047 B CN 110940047B
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air conditioner
temperature
time
evaporator
compressor
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CN110940047A (en
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白韡
许真鑫
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Aux Air Conditioning Co Ltd
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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

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
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  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a refrigerant leakage detection method and an air conditioner, comprising the following steps: s1, starting the air conditioner, and controlling the compressor to operate according to the pre-operation frequency f 0; s2, the air conditioner runs for a time period of T1, and the pressure P11 of the exhaust pipe of the compressor, the running current DL and the maximum pipeline temperature T1 of the evaporator are obtained; s3, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I compared with a predetermined difference in discharge pressure P x and DL and upper limit value of current DL of the compressormaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ P x | DLmaxIf DL I is not less than DLx, refrigerant leakage occurs, otherwise, go to step S4; s4, continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of n evaporators after the air conditioner runs for a time period of T2; s5, the air conditioner judges whether n I T2 n-T1I are all smaller than delta T, if yes, the refrigerant leakage occurs, and if not, the air conditioner operates normally. The refrigerant leakage detection method is simple and easy to realize, and can effectively avoid the occurrence of misjudgment.

Description

Refrigerant leakage detection method and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant leakage detection method and an air conditioner.
Background
The air conditioner is a common household appliance, mainly comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttling element, a controller, a pipeline system, a fan system and the like, and provides a more comfortable living environment for people. The condenser, the evaporator and the tubing on the air conditioner are connected by welding, and the indoor unit, the outdoor unit and the connecting pipe are connected by threads, so that in the installation or use process of the air conditioner, the long-term slow leakage of a refrigerant caused by the fact that a nut of a high-pressure and low-pressure connecting pipe of the indoor unit and the outdoor unit is not tightly sealed may occur, or the refrigerant pipeline is cracked due to the fact that the pipeline of the outdoor unit vibrates and the stress is large, so that the rapid leakage of the refrigerant is caused, and the refrigeration and heating effects of the air conditioner are.
When the air conditioning system operates, the refrigerant quantity is an important factor for ensuring the operation comfort and reliability of the unit. If the treatment cannot be carried out in time, the service life of the compressor can be shortened, and even the compressor can be burnt. However, the refrigerant leakage detection method proposed in the related art can detect the refrigerant leakage only when the refrigerant leakage amount is high (for example, over 40%), and the refrigerant leakage cannot be accurately detected under the condition of low refrigerant leakage amount, which may cause the air conditioner to operate with a small amount of refrigerant for a long time, and affect the service life of the compressor.
The prior art mostly adopts a temperature sensor or a pressure sensor to detect whether a refrigerant leaks or not, when the refrigerant leakage is detected, an air conditioner sends a protection instruction to stop the whole machine to operate, but the slow leakage of the refrigerant is difficult to accurately judge by an air conditioning system, the air conditioning system is easy to misjudge, and the accuracy of the air conditioner in judging the refrigerant leakage is influenced.
Therefore, how to accurately detect whether the refrigerant of the air conditioner leaks rapidly or slowly for a long time in the use process of the air conditioner is an urgent technical problem to be solved, so as to improve the safety and reliability of the operation of the air conditioner.
Disclosure of Invention
In view of this, the present invention is directed to a method for detecting refrigerant leakage and an air conditioner having the same, so as to solve the problem that in the prior art, an air conditioning system can only detect a refrigerant leakage amount when the refrigerant leakage amount is high (for example, more than 40%), and is prone to misjudgment on slow leakage of the refrigerant, so as to improve the sensitivity of the air conditioner in judging refrigerant leakage, and facilitate detection of refrigerant leakage in time.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner refrigerant leakage detection method, the method comprising:
s1, starting the air conditioner, and controlling the compressor to operate according to the pre-operation frequency f 0;
s2, after the air conditioner runs for a time period of T1, obtaining the pressure P11 of the exhaust pipe of the compressor, the running current DL and the maximum pipeline temperature T1 of the evaporator;
s3, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I is compared with a predetermined difference Px of the discharge pressure, DL and the upper limit value DL of the compressor currentmaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ Px |, DLmaxIf DL I is not less than DLx, refrigerant leakage occurs, otherwise, go to step S4;
s4, continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of n evaporators after the air conditioner runs for a time period of T2;
s5, the air conditioner judges whether n I T2 n-T1I are all smaller than delta T, if yes, the refrigerant leakage occurs, and if not, the air conditioner operates in a normal mode.
Further, step S1 includes:
s101, starting up, and acquiring a preset mode of an air conditioner before operation, an outdoor temperature T10 before operation and an indoor temperature T11 before operation;
s102, acquiring air conditioner pre-operation frequency f0 according to an air conditioner pre-operation mode, an air conditioner pre-operation outdoor temperature T10 and an air conditioner pre-operation indoor temperature T11;
s103, the air conditioner operates for a time period of t1 according to f0, and if the operation reaches the time period of t1, S2 is carried out; otherwise, the process returns to S102.
Furthermore, the air conditioner preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user;
the refrigerant comprises pentafluoroethane, trifluoroethane and tetrafluoroethane.
Further, step S4 includes:
s401, controlling a compressor to operate at a frequency f1, and timing the operation duration of the compressor;
s402, continuously operating the air conditioner for a time period of T2 according to f1, and if yes, continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of the n evaporators; if not, returning to S401;
in step S402, f1 ═ n × f0, and f1 ≦ the maximum compressor operating frequency fmax; wherein n is a preset value and is more than or equal to 1.
Further, step S5 includes:
s501, continuously acquiring n real-time pipeline temperatures T2n of the evaporator within a time length of T2, calculating an absolute value of a difference between the maximum pipeline temperature T1 of the evaporator and each real-time pipeline temperature T2n of the evaporator, and acquiring n temperature differences of the evaporator;
s502, judging that any one of the n temperature differences of the evaporator is smaller than or equal to a preset evaporator temperature difference threshold value delta T, if yes, leaking a refrigerant; if not, the air conditioner normally operates;
s503, calculating the proportion Y1 of the temperature difference threshold value of any one evaporator in n temperature differences, wherein the proportion is smaller than or equal to the preset temperature difference threshold value of the evaporator;
s504, after the air conditioner is subjected to frequency conversion to f0 to operate, the operation time of the compressor is timed after the frequency is adjusted to f 1;
s505, judging whether the running time reaches a preset time t 2; if the operation reaches the time duration of t2, repeating the steps S501 and S503; if not, returning to the step S504;
s506, operating the air conditioner for m time periods t2, and judging Y1 and Y2.mWhether the trend is increasing or not; if yes, the refrigerant leaks; otherwise, the air conditioner operates normally.
Further, the method comprises:
s01, starting the air conditioner, and acquiring a preset mode of the air conditioner before operation, the outdoor temperature T10 before operation, the indoor temperature T11 before operation and the current compressor exhaust pressure P11;
s02, acquiring air conditioner running frequency f0 according to the air conditioner preset mode before running, the outdoor temperature T10 before running and the indoor temperature T11 before running;
s03, the air conditioner operates for a time period of t1 according to f0, and if the operation reaches the time period of t1, S2 is carried out; otherwise, returning to S02;
s04, after the air conditioner runs for a time period of T1, obtaining the pressure P11 of the exhaust pipe of the compressor, the running current DL and the maximum pipeline temperature T1 of the evaporator;
s05, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I and a predetermined difference P between the exhaust pressurexComparison, and DL and upper current limit DL of the compressormaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ Px, DL-DLmaxIf it is not less than DLx, refrigerant leakage occurs, otherwise, refrigerant leakage occursStep S06 is performed;
s06, controlling the compressor to run at a frequency f1, and timing the running time of the compressor;
s07, continuously operating the air conditioner for a time length of T2 according to f1, and continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of the n evaporators if the operation reaches the time length of T2; otherwise, returning to S06;
s08, continuously acquiring n real-time pipeline temperatures T2n of the evaporator within a time period of T2, calculating the absolute value of the difference between the maximum pipeline temperature T1 of the evaporator and each real-time pipeline temperature T2n of the evaporator, and acquiring n temperature differences of the evaporator;
s09, judging that any one of the n temperature differences of the evaporator is smaller than or equal to a preset evaporator temperature difference threshold value, if yes, the refrigerant leaks; if not, the air conditioner normally operates;
s10, calculating the proportion Y1 of any temperature difference threshold value which is smaller than or equal to the preset evaporator temperature difference in n temperature differences;
s11, after the air conditioner is changed into f0 to operate, the frequency is adjusted to f1, and then the operation time length of the compressor is timed;
s12, judging whether the running time reaches a preset time t 2; if the operation reaches the time length of t2, repeating the steps S08 and S10; otherwise, returning to step S11;
s13, operating the air conditioner for m times of t2, calculating the proportion Y1, Y2... Ym of any one time of each t2 time which is less than or equal to the preset evaporator temperature difference threshold value in n temperature differences, and judging whether Y1, Y2... Ym is in an increasing trend; if yes, the refrigerant leaks; otherwise, the air conditioner operates normally.
Further, after refrigerant leakage occurs, the compressor operates at the lowest operation frequency, the surface temperature of the refrigerant liquid storage container is detected after t3 operation time, the liquid level position inside the liquid storage container is grasped, and the liquid level position inside the liquid storage container is compared with the liquid level position inside the liquid storage container under the same operation parameters, so that the leakage rate of the refrigerant is judged;
if the leakage rate is less than C, judging that the first-stage leakage occurs, and flashing an alarm indicator light;
if the leakage rate is larger than C, judging that secondary leakage occurs, starting the sound and light alarm device and the wind power device, and stopping the compressor.
An air conditioner adopts the air conditioner refrigerant leakage detection method.
Compared with the prior art, the refrigerant leakage detection method and the air conditioner have the following advantages:
(1) according to the refrigerant leakage detection method and the air conditioner, the secondary judgment of the refrigerant leakage of the air conditioner is performed, so that the accuracy of the judgment of the refrigerant leakage of the air conditioner can be effectively improved, and the occurrence of misjudgment is reduced.
(2) According to the refrigerant leakage detection method and the air conditioner, the rapid and long-term slow leakage of the refrigerant of the air conditioner can be detected through judging the operation parameters and the change trend of the air conditioner, and the sensitivity of refrigerant leakage detection is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a refrigerant leakage detection method and an air conditioner according to an embodiment of the present invention;
fig. 2 is another flow chart of a method for detecting refrigerant leakage and an air conditioner according to an embodiment of the present invention.
Fig. 3 is a flowchart of a method for detecting refrigerant leakage according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Embodiment 1 as shown in fig. 1, this embodiment provides a method for detecting refrigerant leakage, where an execution main body of the method is an air conditioner, and the method includes the following steps: s1, starting the air conditioner, and controlling the compressor to operate according to the pre-operation frequency f 0; turning on the power supplyThe air conditioner acquires a preset operation mode, an outdoor temperature T10 before operation and an indoor temperature T11 before operation, wherein the air conditioner detects the temperature parameters through a plurality of temperature sensors. In the air conditioner data storage device, a plurality of relational expressions of air conditioner operation frequency are prestored, and the compressor frequency f0 corresponding to the current operation mode, the outdoor environment temperature of the operation front room and the environment temperature in the operation front room can be searched through the prestored relational expressions, wherein the prestored relational expressions comprise the air conditioner operation mode, the outdoor environment temperature, the indoor environment temperature and the upper limit value DL of the compressor currentmaxAnd the upper limit value of the pressure of the exhaust pipe corresponds to the operation frequency of the air conditioner. The air conditioner retrieves a corresponding pre-operation frequency f0 from an air conditioner data storage device according to an air conditioner preset operation mode and at least one data information of a pre-operation outdoor temperature T10 and a pre-operation indoor temperature T11. The preset air conditioner modes comprise an operation mode before the last shutdown of the air conditioner and an operation mode set by a user after the current startup; specifically, if the user actively sets an operation mode when the air conditioner is started at this time, the preset mode of the air conditioner is the operation mode set by the user; if the air conditioner is started at this time, the user does not set the operation mode, the preset mode of the air conditioner is the operation mode before the last shutdown of the air conditioner; the operation modes include a cooling mode, a heating mode, a dehumidifying mode, a ventilating mode, and the like. After the air conditioner is started, the compressor runs according to f0, on one hand, the air conditioner compressor can be preheated, the compressor gradually enters a working state, the phenomenon that the compressor is overloaded due to external extreme conditions is avoided, and meanwhile, the use requirement of a user on the air conditioner can be met.
S2, after the air conditioner runs for a time period of T1, obtaining the pressure P11 of the exhaust pipe of the compressor, the maximum pipeline temperature T1 of the evaporator and the running current DL;
wherein, the air conditioner passes through pressure acquisition device and detects compressor exhaust pipe pressure, and the operating current DL of compressor adopts prior art to detect.
The pressure acquisition device can be a pressure sensor or a pressure switch.
During the time period t1 when the air conditioner is just started to operate, the temperature of the pipeline of the evaporator can change rapidly and gradually tend to be smooth again. P evaporator pipeline temperatures are obtained intermittently by the temperature sensor in the time period of T1, and the maximum pipeline temperature T1 of the evaporator is obtained through comparison.
S3, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I is compared with a predetermined difference Px of the discharge pressure, DL and the upper limit value DL of the compressor currentmaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ Px, DL-DLmaxIf yes, the refrigerant leakage occurs, otherwise, the step S4 is performed;
obtaining the upper limit value P of the pressure of the exhaust pipe of the compressor under the pre-operation frequency f0 through a relational expression corresponding to the pre-operation frequencymaxUpper limit of current DLmax。
When the air conditioning system is lack of refrigerant, the load of the compressor is reduced, the current DL of the compressor is reduced, and the current DL of the compressor and the current upper limit value DL of the compressor are reducedmaxThe difference is greater than a predetermined current difference DLx; at the same time, the exhaust pipe pressure will drop.
After the air conditioner runs for a time period of t1, the pressure value of the exhaust pipe and the running current of the compressor are detected, so that data fluctuation can be reduced, and the stability of relevant data is improved. The pressure value of the exhaust pipe and the running current of the compressor are judged doubly, so that the accuracy of refrigerant leakage detection is improved, and the occurrence of misjudgment is reduced.
S4, continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of n evaporators within a time period of T2 operation of the air conditioner;
the air conditioner detects the real-time pipeline temperature of the evaporator through a temperature sensor. After the time period of t1, the real-time pipeline temperature of the evaporator is within a relatively stable temperature curve range, and the temperature change among the real-time pipeline temperatures of the evaporator is relatively small, so the operation time period t2 of the air conditioner can be set to be a little shorter, and preferably, the time period t2 is 2-4 minutes.
S5, the air conditioner judges whether n I T2 n-T1I are all smaller than delta T, if yes, refrigerant leakage occurs, if not, the air conditioner finishes the preset operation and operates according to the preset mode of the air conditioner.
Under the condition that the refrigerant does not leak, a relatively obvious temperature change exists between the maximum pipeline temperature of the evaporator and each real-time pipeline temperature of the evaporator, and when the refrigerant leaks, the temperature change is not obvious or even does not change.
According to the embodiment, the temperature difference threshold value delta T can be set to be 3-5 ℃, the detection sensitivity is favorably improved, and the probability of misjudgment is further reduced.
Through 2 judgments on refrigerant leakage, the accuracy of judgment on refrigerant leakage of the air conditioner can be improved, and the occurrence of misjudgments can be effectively reduced.
According to the embodiment, the refrigerant leakage is judged respectively according to different operation stages of the air conditioner, the detection accuracy can be ensured while the refrigerant leakage is detected, the machine damage or safety accident is avoided, the combination of related parameters is verified during each judgment, and the misjudgment is favorably avoided.
Example 2
In order to further ensure the accuracy of refrigerant leakage detection, as shown in fig. 2, the process of determining refrigerant leakage of an evaporator by an air conditioner according to the refrigerant leakage detection method of an air conditioner in embodiment 1 is further described, specifically, steps S4 and S5 are further described.
Specifically, step S4 includes:
s401, controlling the compressor to run at a frequency f1 by the air conditioner, and timing the running time of the compressor;
wherein, f1 is n f0, and f1 is not more than the highest running frequency fmax of the compressor; wherein n is a preset value and is more than or equal to 1; the process is that the air conditioner finishes the pre-operation, so that the indoor environment can reach the state corresponding to the preset mode as soon as possible, and the user requirements are met.
S402, continuously operating the air conditioner for a time period of T2 according to f1, and if yes, intermittently acquiring real-time pipeline temperatures T21 and T22.. T2n of n evaporators in the time period; otherwise, the process returns to S401.
Specifically, step S5 includes:
s501, calculating the absolute value of the difference between the maximum pipeline temperature T1 of the evaporator and each real-time pipeline temperature T2n of the evaporator to obtain n temperature differences of the evaporator;
s502, judging that any one of the n temperature differences of the evaporator is smaller than or equal to a preset evaporator temperature difference threshold value, if so, leaking the refrigerant; if not, the air conditioner normally operates;
s503, calculating the proportion Y1 of the temperature difference threshold value of any one evaporator in n temperature differences, wherein the proportion is smaller than or equal to the preset temperature difference threshold value of the evaporator;
s504, after the air conditioner is subjected to frequency conversion to f0 to operate, the frequency is adjusted to f1 again to operate, and the operation time length of the compressor is timed;
s505, judging whether the running time reaches a preset time t 2; if yes, repeating the steps S501, S502 and S503; if not, returning to the step S504;
s506, operating the air conditioner for m time periods t2, and judging Y1 and Y2.mWhether the trend is increasing or not; if yes, the refrigerant leaks; otherwise, the air conditioner operates normally.
Through calculating the proportion Yi of the temperature difference threshold value of the preset evaporator in n temperature differences within a plurality of preset time lengths, the change trend of the difference value between the real-time pipeline temperature of the evaporator and the maximum pipeline temperature of the evaporator is judged, so that the slow leakage of a refrigerant existing in the air conditioner is judged, the operation reliability of the air conditioner can be improved, and the follow-up after sale can be guided in time.
Example 3
As shown in fig. 3, in order to further improve the accuracy of the air conditioner in determining refrigerant leakage, the present invention provides another method for detecting refrigerant leakage of an air conditioner, which specifically includes:
s01, starting the air conditioner, and acquiring a preset mode of the air conditioner before operation, the outdoor temperature T10 before operation, the indoor temperature T11 before operation and the current compressor exhaust pressure P11; s02, acquiring air conditioner pre-operation frequency f0 according to an air conditioner pre-operation mode, an air conditioner pre-operation outdoor temperature T10 and an air conditioner pre-operation indoor temperature T11;
s03, the air conditioner operates for t1 time according to f0, if yes, S2 is carried out; otherwise, returning to S02;
s04, after the air conditioner runs for a time period of T1, obtaining the pressure P11 of the exhaust pipe of the compressor, the running current DL and the maximum pipeline temperature T1 of the evaporator;
s05, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I and a predetermined difference P between the exhaust pressurexComparison, and DL and upper current limit DL of the compressormaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ Px, DL-DLmaxIf yes, the refrigerant leakage occurs, otherwise, the step S06 is performed;
s06, controlling the compressor to run at a frequency f1, and timing the running time of the compressor;
s07, continuously operating the air conditioner for a time period of T2 according to f1, and if yes, continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of the n evaporators; otherwise, returning to S06;
s08, continuously acquiring n real-time pipeline temperatures T2n of the evaporator within a time period of T2, calculating the absolute value of the difference between the maximum pipeline temperature T1 of the evaporator and each real-time pipeline temperature T2n of the evaporator, and acquiring n temperature differences of the evaporator;
s09, judging that any one of the n temperature differences of the evaporator is smaller than or equal to a preset evaporator temperature difference threshold value, if yes, the refrigerant leaks; if not, the air conditioner normally operates;
s10, calculating the proportion Y1 of any temperature difference threshold value which is smaller than or equal to the preset evaporator temperature difference in n temperature differences;
s11, after the air conditioner is changed into f0 to operate, the frequency is adjusted to f1, and then the operation time length of the compressor is timed;
s12, judging whether the running time reaches a preset time t 2; if yes, repeating the steps S08 and S10; otherwise, returning to step S11;
s13, operating the air conditioner for m times of t2, calculating the proportion Y1, Y2... Ym of any one time of each t2 time which is less than or equal to the preset evaporator temperature difference threshold value in n temperature differences, and judging whether Y1, Y2... Ym is in an increasing trend; if yes, the refrigerant leaks; otherwise, the air conditioner operates normally.
The method and the device respectively judge whether the refrigerant leaks or not in the pre-operation stage and the operation stage of the air conditioner, and judge that the refrigerant leaks only when the combination of different parameters in the preset time meets the condition, thereby ensuring the accuracy of the judgment of the refrigerant leakage by the air conditioner and avoiding the occurrence of the misjudgment condition. Meanwhile, the change trend that the real-time pipeline temperature difference value of the evaporator is smaller than the preset value is analyzed, the potential slow refrigerant leakage can be effectively judged, and therefore the accuracy of the air conditioner in judging the refrigerant leakage can be further improved.
Example 4
After the refrigerant leaks in the air conditioner, if not only can reduce the life of compressor, even burn out the compressor, but also have certain potential safety hazard, in order to after the refrigerant leaks, the air conditioner can be timely, rationally process the refrigerant leakage, this embodiment is on the basis of any method in embodiment 1-3, after judging that the refrigerant leaks, judge the leakage condition-leakage rate to carry out the hierarchical processing according to the leakage rate, specifically include:
after refrigerant leakage occurs, the compressor is adjusted to the lowest frequency to operate, the air-conditioning compressor can be effectively protected, and meanwhile, the operation frequency adjustment can change the temperature inside the refrigerant liquid storage container, so that the temperature difference between a gas phase part and a liquid phase part is generated, and the gas and liquid at the arrangement position of the temperature sensor are judged. After the operation is carried out for a period of time t3, a plurality of temperature sensors are arranged in the vertical direction of the refrigerant liquid storage container to detect the liquid level position hMeasuring。
The theoretical liquid level position h of the refrigerant liquid storage container under the same operation parameters is obtained through the pre-stored data of the air conditionerTheory of the invention. By the position h of the liquid surface detected under leakage of refrigerantMeasuringAnd the theoretical liquid level position hTheory of the inventionAnd comparing to obtain the refrigerant leakage rate.
Refrigerant leakage rate (%) < hMeasuring/hTheory of the invention*100％
The air conditioner judges whether the refrigerant leakage rate is less than or equal to C; if yes, judging that first-level leakage occurs, and flashing an early warning indicator light; if not, judging that secondary leakage occurs, starting the sound and light alarm device and the wind power device, and stopping the compressor.
And classifying the refrigerant leakage degree by detecting the refrigerant leakage rate. When the refrigerant leakage rate is less than or equal to C, the refrigerant is indicated to have trace leakage, and the early warning indicator lamp of the air conditioner flickers at the moment, so that a user can be reminded of the refrigerant leakage on the premise of not influencing the use, and meanwhile, the maintenance of maintenance personnel is facilitated. When the refrigerant leakage rate is larger than C, the refrigerant leakage of the air conditioner is serious, and a rapid leakage condition possibly exists, at the moment, the compressor is stopped to protect the air conditioner, and meanwhile, the wind power device is started, so that the leaked refrigerant can be diffused in time conveniently, and the safety of a user is ensured; meanwhile, the audible and visual alarm device is started to clearly inform the air conditioner of the leakage of the refrigerant.
Example 5
The present embodiment provides an air conditioner, which employs the method for detecting refrigerant leakage of an air conditioner provided in any one of embodiments 1 to 4. Specifically, the air conditioner includes:
the data acquisition device is used for acquiring the compressor exhaust temperature, the running current, the maximum pipeline temperature of the evaporator within the time length of t1 and n real-time pipeline temperatures of the evaporator and m real-time pipeline temperatures within the time length of t2 continuously within the time length of t2, wherein n is a preset positive integer;
the method specifically comprises the following steps: temperature sensors, pressure sensors, etc. Preferably, the data acquisition device is further configured to: extracting n consecutive real-time pipeline temperatures of the evaporator from the q real-time pipeline temperatures of the evaporator collected in the time period t 2.
And the central processing unit is used for processing the detected related operation parameters, comparing the detected related operation parameters with preset parameters, analyzing and processing the detected related operation parameters, judging whether the refrigerant leaks or not, sending a corresponding control instruction to related parts of the air conditioner and executing a refrigerant leakage processing program.
And the data storage device is used for storing the preset data of the air conditioner and the related data of the refrigerant leakage of the air conditioner.
The relevant data pre-stored in the data storage device at least comprises data relevant to an air conditioner operation mode, a preset maximum pressure value of an exhaust pipe, a preset maximum current value of a compressor, a corresponding relation between a preset operation frequency and indoor environment temperature and outdoor environment temperature, a preset change value of the pressure of the exhaust pipe, a preset change value of the current of the compressor and a theoretical liquid level value of an air conditioner refrigerant liquid storage container.
Preferably, the apparatus for detecting refrigerant leakage of an air conditioner further comprises a timing device, configured to: after the air conditioner is started up every time, timing the operation time of the compressor when judging the refrigerant leakage;
in addition, on the basis of the structure of the air conditioner described in this embodiment, the air conditioner further includes other components of the indoor unit and the outdoor unit of the air conditioner, such as a shell structure, an air guide mechanism, a variable frequency compressor, a coil structure, and the like, which are not described herein again in view of the fact that they are all the prior art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for detecting refrigerant leakage, the method comprising:
s1, starting the air conditioner, and controlling the compressor to operate according to the pre-operation frequency f 0;
s2, the air conditioner runs for a time period of T1, and the pressure P11 of the exhaust pipe of the compressor, the running current DL and the maximum pipeline temperature T1 of the evaporator are obtained;
s3, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I compared with a predetermined difference Px of the discharge pressure and DL and the upper limit value DL of the compressor currentmaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ Px |, DLmaxIf DL I is not less than DLx, refrigerant leakage occurs, otherwise, go to step S4;
s4, continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of n evaporators after the air conditioner runs for a time period of T2;
s5, the air conditioner judges whether n I T2 n-T1I are all smaller than delta T, if yes, the refrigerant leakage occurs, and if not, the air conditioner operates in a normal mode.
2. The method as claimed in claim 1, wherein the step S1 includes:
s101, starting up, and acquiring a preset mode of an air conditioner before operation, an outdoor temperature T10 before operation and an indoor temperature T11 before operation;
s102, acquiring air conditioner pre-operation frequency f0 according to an air conditioner pre-operation mode, an air conditioner pre-operation outdoor temperature T10 and an air conditioner pre-operation indoor temperature T11;
s103, the air conditioner operates for a time period of t1 according to f0, and if the air conditioner operates for a time period of t1, S2 is carried out; otherwise, the process returns to S102.
3. The method for detecting refrigerant leakage as claimed in claim 2, wherein: the air conditioner preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user;
the refrigerant comprises pentafluoroethane, trifluoroethane and tetrafluoroethane.
4. The method as claimed in claim 1, wherein the step S4 includes:
s401, controlling a compressor to operate at a frequency f1, and timing the operation duration of the compressor;
s402, continuously operating the air conditioner for a time period of T2 according to f1, and continuously acquiring real-time pipeline temperatures T21 and T22.. T2n of n evaporators if the air conditioner is operated for a time period of T2; otherwise, the process returns to S401.
5. The method as claimed in claim 4, wherein in step S402, f1 is n f0, and f1 is equal to or less than the maximum operating frequency fmax of the compressor; wherein n is a preset value and is more than or equal to 1.
6. The method as claimed in claim 1, wherein the step S5 includes:
s501, continuously acquiring n real-time pipeline temperatures T2n of the evaporator within a time length of T2, calculating an absolute value of a difference between the maximum pipeline temperature T1 of the evaporator and each real-time pipeline temperature T2n of the evaporator, and acquiring n temperature differences of the evaporator;
s502, judging that any one of the n temperature differences of the evaporator is smaller than or equal to a preset evaporator temperature difference threshold value delta T, if yes, leaking a refrigerant; otherwise, the air conditioner operates normally.
7. The method of claim 6, further comprising:
s503, calculating the proportion Y1 of the temperature difference threshold value of any one evaporator in n temperature differences, which is less than or equal to the preset temperature difference threshold value of the evaporator, and recording Y1;
s504, after the air conditioner is operated after the frequency is changed to a pre-operation frequency f0, the operation time of the compressor is timed after the frequency is adjusted to f 1;
s505, judging whether the running time reaches a preset time t 2; if the operation reaches the time duration of t2, repeating the steps S501 and S503; if not, returning to the step S504;
s506, operating the air conditioner for m times of t2 time, and judging whether Y1 and Y2.. Ym is in an increasing trend; if yes, the refrigerant leaks; otherwise, the air conditioner operates normally.
8. A method for detecting refrigerant leakage, the method comprising:
s01, starting the air conditioner, and acquiring a preset mode of the air conditioner before operation, an outdoor temperature T10 before operation and an indoor temperature T11 before operation;
s02, acquiring air conditioner pre-operation frequency f0 according to an air conditioner pre-operation mode, an air conditioner pre-operation outdoor temperature T10 and an air conditioner pre-operation indoor temperature T11;
s03, the air conditioner operates for a time period of t1 according to f0, and if the operation reaches the time period of t1, S04 is carried out; otherwise, returning to S02;
s04, after the air conditioner runs for a time period of T1, obtaining the pressure P11 of the exhaust pipe of the compressor, the running current DL and the maximum pipeline temperature T1 of the evaporator;
s05, adjusting the pressure of the air conditioner to P11 and the upper limit value P of the exhaust pipe pressuremaxDifference value Pmax-P11I compared with a predetermined difference Px of the discharge pressure and DL and the upper limit value DL of the compressor currentmaxDifference value of DLmax-DL I is compared with a predetermined difference value DLx of the current, Pmax-P11 | ≧ Px and | DL-DLmaxIf yes, the refrigerant leakage occurs, otherwise, the step S06 is performed;
s06, controlling the compressor to run at a frequency f1 by the air conditioner, and timing the running time of the compressor;
s07, continuously operating the air conditioner for a time length of t2 according to f1, and if the operation reaches the time length of t2, performing S08; otherwise, returning to S06;
s08, continuously acquiring n real-time pipeline temperatures T2n of the evaporator within a time period of T2, calculating the absolute value of the difference between the maximum pipeline temperature T1 of the evaporator and each real-time pipeline temperature T2n of the evaporator, and acquiring n temperature differences of the evaporator;
s09, judging that any one of the n temperature differences of the evaporator is smaller than or equal to a preset evaporator temperature difference threshold value, if yes, the refrigerant leaks; if not, the air conditioner normally operates;
s10, calculating the proportion Y1 of any temperature difference threshold value which is smaller than or equal to the preset evaporator temperature difference in n temperature differences;
s11, after the air conditioner is operated after the frequency is changed to a pre-operation frequency f0, the operation time of the compressor is timed after the frequency is adjusted to f 1;
s12, judging whether the running time reaches a preset time t 2; if the operation reaches the time length of t2, repeating the steps S08 and S10; otherwise, returning to step S11;
s13, operating the air conditioner for m times of t2, calculating the proportion Y1, Y2... Ym of any one time of each t2 time which is less than or equal to the preset evaporator temperature difference threshold value in n temperature differences, and judging whether Y1, Y2... Ym is in an increasing trend; if yes, the refrigerant leaks; otherwise, the air conditioner operates normally.
9. The method for detecting refrigerant leakage according to any one of claims 1 to 8, wherein after refrigerant leakage occurs, the compressor is operated at the lowest operating frequency, the surface temperature of the refrigerant liquid storage container is detected after t3 operation time duration, the liquid level position inside the refrigerant liquid storage container is grasped, and the liquid level position is compared with the theoretical liquid level inside the refrigerant liquid storage container under the same operating parameters, so that the refrigerant leakage rate is judged;
if the leakage rate is less than C, judging that the first-stage leakage occurs, and flashing an alarm indicator light;
if the leakage rate is larger than C, judging that secondary leakage occurs, starting the sound and light alarm device and the wind power device, and stopping the compressor.
10. An air conditioner, characterized in that the air conditioner adopts a refrigerant leakage detection method as claimed in any one of claims 1 to 9.
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