CN110857808A - Air conditioner refrigerant leakage detection method and air conditioner - Google Patents
Air conditioner refrigerant leakage detection method and air conditioner Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention provides an air conditioner refrigerant leakage detection method and an air conditioner, comprising the following steps: s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation; s2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0; s3, obtaining the exhaust superheat Tp after the air conditioner is operated for a time of t1 in advance; s4, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5; and S5, finishing the pre-operation of the air conditioner and operating according to a pre-set mode. The air conditioner refrigerant leakage detection method improves the accuracy of the air conditioner in refrigerant leakage detection and reduces the occurrence of misjudgment.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner refrigerant leakage detection method and an air conditioner.
Background
With the progress of the current society and the development of economy, the air conditioner is taken as an important electrical appliance in daily life of people and has gone into thousands of households. However, in the installation process and the long-term use process of the air conditioner, the pipeline may be damaged due to poor sealing performance, bending, long-term corrosion or other external insurability, and the air conditioner refrigerant may leak. Fundamentally, the refrigerant leakage is reflected in the reduction of refrigerant flow, the performance of the air conditioner is reduced due to the insufficient refrigerant flow, the compressor is enabled to run under the poor condition, and the compressor is even damaged in the severe condition.
Most of the existing technologies adopt 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 from running, but the air conditioning system is easy to misjudge in the process of starting running to running stability or under the working condition of high temperature and high humidity, and the accuracy of the air conditioner in judging the refrigerant leakage is influenced.
The applicant has started the technical research on the prevention of the leakage of the refrigerant of the air conditioner in the early period and filed the related patent applications with the application numbers of: CN200910099237.9, invention name: a method for judging the leakage of refrigerant in air conditioner is disclosed, which comprises the following steps: a. recording the temperature T of the indoor coil before the compressor is started; b. judging whether the compressor is started, if so, carrying out the next step, otherwise, returning to the step a; c. judging whether the compressor continuously runs for x minutes, if so, performing the next step, otherwise, returning to the step b; d. recording the indoor coil temperature T' and the simultaneous indoor temperature Tr when the compressor continuously operates for x minutes; e. calculating the temperature difference between the indoor coil temperature T 'when the compressor continuously operates for x minutes and the indoor coil temperature T before the compressor starts, calculating the temperature difference between the indoor coil temperature T' when the compressor continuously operates for x minutes and the indoor temperature Tr at the same time, judging whether the two temperature differences are smaller than y, if so, entering the step f, otherwise, resetting the operation time of the compressor and returning to the step b; f. and (5) stopping the machine and reporting faults. However, as the applicant further studies on the refrigerant leakage prevention of the air conditioner, it is found that the technical scheme in the application is also prone to have a misjudgment phenomenon in a specific implementation process, especially in some specific use environments, and the accuracy of the air conditioner in judging the refrigerant leakage is affected.
Disclosure of Invention
In view of this, the present invention provides an air conditioner refrigerant leakage detection method and an air conditioner, so as to solve the problem that an air conditioning system in the prior art is prone to generate misjudgment when a refrigerant leaks, and to improve the accuracy of the air conditioner in judging the refrigerant leakage.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner refrigerant leakage detection method comprises the following steps:
s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation;
s2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s3, obtaining the exhaust superheat Tp after the air conditioner is operated for a time of t1 in advance;
s4, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5;
and S5, finishing the pre-operation of the air conditioner and operating according to a pre-set mode.
Further, the related information before operation includes a preset mode, an outdoor temperature T21 before operation, and an indoor temperature T22 before operation;
the preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user.
Further, step S1 includes:
s101, starting an air conditioner, and acquiring the pressure P10 of an air suction pipe when a compressor does not operate;
s102, judging whether the pressure P10 of the air suction pipe is smaller than a preset pressure by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S103;
s103, the air conditioner acquires relevant information before operation, and acquires a pre-operation frequency f0 according to the relevant information before operation.
Further, step S3 includes:
s301, obtaining the pressure P11 of the compressor exhaust pipe and the temperature T11 of the compressor exhaust pipe after the air conditioner runs for a time period T1 in advance;
s302, the air conditioner obtains a refrigerant saturation temperature T31 according to the pressure P11 of the exhaust pipe of the compressor;
s303, the air conditioner obtains the exhaust superheat Tp according to the temperature T11 of the exhaust pipe of the compressor and the saturation temperature T31 of a refrigerant;
the discharge superheat Tp is the compressor discharge pipe temperature T11 — refrigerant saturation temperature T31.
Further, after step S5, the method further includes:
s6, after the air conditioner runs for a time period of T2, obtaining the supercooling degree T0 of the condenser;
s7, judging whether the condenser supercooling degree T0 is smaller than a third threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S8;
and S8, normally operating the air conditioner according to a preset mode.
Further, step S4 includes:
s401, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, go to step S404; otherwise, go to step S402;
s402, sampling the pressure of a compressor suction pipe by an air conditioner;
s403, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a pressure threshold value by the air conditioner; if yes, go to step S5; otherwise, go to step S8;
s404, the air conditioner obtains the pressure P12 of the air suction pipe of the compressor and the temperature T12 of the air suction pipe of the compressor;
s405, the air conditioner obtains a refrigerant saturation temperature T32 according to the pressure P12 of the suction pipe of the compressor;
s406, the air conditioner acquires suction superheat Tx according to the temperature T12 of a suction pipe of the compressor and the saturation temperature T32 of a refrigerant;
s407, judging whether the suction superheat Tx is larger than a second threshold value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5;
the suction superheat Tx is the compressor suction pipe temperature T12 — refrigerant saturation temperature T32.
Further, step S6 includes:
s601, after the air conditioner runs for T2 time, acquiring condenser outlet pressure P13 and condenser outlet temperature T13;
s602, acquiring a refrigerant saturation temperature T33 by the air conditioner according to the condenser outlet pressure P13;
s603, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T33 and the condenser outlet temperature T13;
the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T33 — the condenser outlet temperature T13.
An air conditioner refrigerant leakage detection method comprises the following steps:
s01, starting the air conditioner, and acquiring the pressure P10 of the air suction pipe when the compressor does not operate;
s02, judging whether the pressure P10 of the air suction pipe is smaller than the preset pressure by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S03;
s03, the air conditioner acquires a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation;
s04, the air conditioner obtains a pre-operation frequency f0 according to a preset mode, the outdoor temperature T21 before operation and the indoor temperature T22 before operation;
s05, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s06, obtaining the pressure P11 of the compressor exhaust pipe and the temperature T11 of the compressor exhaust pipe after the air conditioner runs for a time period T1;
s07, the air conditioner obtains the refrigerant saturation temperature T31 according to the pressure P11 of the compressor exhaust pipe;
s08, the air conditioner obtains the exhaust superheat Tp according to the temperature T11 of the compressor exhaust pipe and the refrigerant saturation temperature T31;
s09, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, go to step S12; otherwise, go to step S10;
s10, sampling the pressure of the compressor suction pipe by the air conditioner;
s11, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a pressure threshold value by the air conditioner; if yes, go to step S16; otherwise, go to step S22;
s12, the air conditioner acquires the pressure P12 of the air suction pipe of the compressor and the temperature T12 of the air suction pipe of the compressor;
s13, the air conditioner obtains the refrigerant saturation temperature T32 according to the pressure P12 of the compressor suction pipe;
s14, the air conditioner obtains the suction superheat Tx according to the temperature T12 of the suction pipe of the compressor and the saturation temperature T32 of the refrigerant;
s15, judging whether the suction superheat Tx is larger than a second threshold value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S16;
s16, finishing the pre-operation of the air conditioner, operating according to a preset mode, and controlling the counter to return to zero;
s17, after the air conditioner runs for a time period of T2, acquiring the outlet pressure P13 and the outlet temperature T13 of the condenser;
s18, the air conditioner obtains the refrigerant saturation temperature T33 according to the condenser outlet pressure P13;
s19, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T33 and the condenser outlet temperature T13, and the count value of the counter is controlled to be increased by 1;
s20, judging whether the condenser supercooling degree T0 is smaller than a third threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S21;
s21, judging whether the count value of the counter is smaller than a preset count value by the air conditioner; if yes, return to step S17; otherwise, go to step S22;
s22, normally operating the air conditioner according to a preset mode;
s23, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S16; otherwise, the process returns to step S22.
Furthermore, the exhaust superheat degree Tp is equal to the compressor exhaust pipe temperature T11-refrigerant saturation temperature T31;
suction superheat Tx ═ compressor suction pipe temperature T12 — refrigerant saturation temperature T32;
the condenser subcooling degree T0 is equal to the refrigerant saturation temperature T33 — the condenser outlet temperature T13.
An air conditioner adopts the air conditioner refrigerant leakage detection method.
Compared with the prior art, the air conditioner refrigerant leakage detection method and the air conditioner have the following advantages:
according to the air conditioner refrigerant leakage detection method and the air conditioner, before the air conditioner operates according to the preset mode, the air conditioner pre-operation process is set, the exhaust superheat degree is obtained in the pre-operation stage, the refrigerant leakage is detected and analyzed by utilizing the specific condition of the exhaust superheat degree, the accuracy of the air conditioner in judging the refrigerant leakage is improved, and the occurrence of misjudgment is reduced.
In addition, after the detection and analysis of the exhaust superheat degree are carried out, the air conditioner and the method for detecting the refrigerant leakage of the air conditioner are further provided with a first rechecking condition and a second rechecking condition in the pre-operation stage of the air conditioner, and the rechecking is carried out on the judgment results with different exhaust superheat degrees respectively, so that the accuracy of refrigerant leakage detection is further improved, and the occurrence of misjudgment is reduced.
Meanwhile, according to the air conditioner refrigerant leakage detection method and the air conditioner, after the pre-operation stage is finished, the air conditioner operates according to a preset mode to obtain the supercooling degree of the condenser, the refrigerant leakage is detected and analyzed for multiple times by utilizing the specific condition of the supercooling degree of the condenser, and a closed detection and analysis process is formed, so that the accuracy of the air conditioner in judging the refrigerant leakage is further improved, the occurrence of misjudgment is avoided, and the refrigerant leakage which possibly occurs at any time in the use process of the air conditioner is effectively detected and protected.
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 an air conditioner refrigerant leakage detection method and an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an air conditioner refrigerant leakage detection method and an air conditioner according to an embodiment of the present invention;
fig. 3 is another schematic flow chart of the air conditioner refrigerant leakage detection method and the air conditioner according to the embodiment of the invention;
fig. 4 is a flow chart of an air conditioner and a method for detecting refrigerant leakage of the air conditioner according to an embodiment of the present invention;
fig. 5 is another flow chart of the air conditioner and a method for detecting refrigerant leakage of the air conditioner according to the 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.
First, it should be noted that, without any specific explanation, the air conditioner or the air conditioner in the present invention is referred to as an inverter air conditioner.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
As shown in fig. 1, the present embodiment provides a method for detecting refrigerant leakage of an air conditioner, where an execution main body of the method is an air conditioner, and the method includes the following steps:
s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation;
the related information before operation comprises a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation; wherein, the air conditioner detects each item temperature parameter respectively through setting up a plurality of temperature sensor.
The preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user; specifically, if the user actively sets an operation mode when the air conditioner is started at this time, the preset mode is the operation mode set by the user; if the user does not set the operation mode, the preset mode is the operation mode of the air conditioner before the air conditioner is turned off at the last time;
in addition, before the air conditioner leaves the factory, an air conditioner manufacturer presets a plurality of pre-operation frequencies and corresponding relations between each pre-operation frequency and different air conditioner related parameters (such as data of a preset mode, a pre-operation outdoor temperature T21, a pre-operation indoor temperature T22 and the like) in an air conditioner data storage device;
the air conditioner calls a corresponding pre-operation frequency f0 from an air conditioner data storage device according to at least two data information of a preset mode, a pre-operation outdoor temperature T21 and a pre-operation indoor temperature T22; preferably, the air conditioner acquires a corresponding pre-operation frequency f0 from the air conditioner data storage device according to three data information, namely a preset mode, a pre-operation outdoor temperature T21 and a pre-operation indoor temperature T22, wherein f0 < the maximum operation frequency fmax of the air conditioner.
S2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
in the air conditioner pre-operation stage, the compressor keeps the pre-operation frequency f0 in operation, on one hand, the use requirement of a user on the air conditioner is met, and on the other hand, the air conditioner enters a stable operation state, so that the detection of refrigerant leakage is facilitated.
S3, obtaining the exhaust superheat Tp after the air conditioner is operated for a time of t1 in advance;
after the air conditioner runs for t1 time in advance, namely the air conditioner runs stably, data are obtained, so that the stability and the accuracy of the obtained data are ensured, and the accuracy of detecting the refrigerant leakage of the air conditioner is guaranteed.
S4, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5;
in the operation process of the air conditioner, the refrigerant medium is changed from low-pressure low-temperature steam into high-temperature high-pressure superheated steam through the compressor, and the superheat phenomenon of a refrigerant can occur in the process, namely superheat degree parameters exist in the compressor of the refrigerant; when the air conditioner normally operates and a refrigerant is not leaked, the superheat degree parameter is always kept in a stable range; when the air conditioner leaks the refrigerant, the superheat degree parameter can be increased along with the reduction of the refrigerant quantity under the influence of the continuous output of the power of the compressor; therefore, the superheat degree condition of the refrigerant in the exhaust pipe of the compressor is obtained, and the exhaust superheat degree is used as a basis for detecting the refrigerant leakage, so that compared with a refrigerant leakage detection method in the prior art, the method can effectively improve the accuracy of judgment of the refrigerant leakage by the air conditioner, and avoid the occurrence of misjudgment.
In the actual use process, air conditioners produced by different air conditioner manufacturers have certain differences in air conditioner type, power and types of filled refrigerants; correspondingly, the superheat degree condition of the refrigerant in the exhaust pipe of the compressor and the first threshold value are different; specifically, before the air conditioner leaves the factory, the first threshold is data information pre-stored in the air conditioner data storage device by the air conditioner manufacturer according to the actual condition of the air conditioner.
And S5, finishing the pre-operation of the air conditioner and operating according to a pre-set mode.
If the air conditioner is in the pre-operation stage, the refrigerant leakage is not detected, the pre-operation is finished, and the air conditioner is switched to the preset mode to continue to operate, so that the air conditioner can timely and quickly meet the requirements of users on the air conditioner while the refrigerant is detected; correspondingly, the preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user.
Example 2
As shown in fig. 2, in order to further improve the accuracy of the air conditioner in determining refrigerant leakage, the present embodiment further supplements the method in embodiment 1 on the basis of embodiment 1.
Specifically, with the method in embodiment 1, after performing step S5, the method further includes:
s6, after the air conditioner runs for a time period of T2, obtaining the supercooling degree T0 of the condenser;
in the pre-operation stage, refrigerant leakage is not detected, the air conditioner finishes pre-operation and is switched to a preset mode to continue operation, and the air conditioner can be regarded as a normal operation stage; in the normal operation stage of the air conditioner, after the air conditioner operates for t2 time, namely after the air conditioner operates stably, the refrigerant leakage of the air conditioner is detected again, so that the accuracy of refrigerant leakage judgment is improved, and the misjudgment possibly occurring in the pre-operation stage is reduced.
S7, judging whether the condenser supercooling degree T0 is smaller than a third threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S8;
in the operation process of the air conditioner, the cold medium is changed into a high-temperature and high-pressure gaseous medium through a compressor; then, the high-temperature high-pressure gaseous refrigerant medium is changed into a medium-temperature high-pressure liquid medium through a condenser, and for the gaseous refrigerant medium, in the process of changing the gaseous state into the liquid state, the supercooling phenomenon of a refrigerant can occur, namely the refrigerant has a supercooling degree parameter at the condenser; when the air conditioner normally operates and the refrigerant is not leaked, the supercooling degree parameter is always kept in a stable range; when the air conditioner leaks the refrigerant, the supercooling degree parameter of the air conditioner is reduced, and even becomes 0 degree when the leakage is serious, and particularly in the air conditioner provided with the air-cooled condenser, the supercooling degree parameter is greatly influenced by the refrigerant leakage;
therefore, in the normal operation stage of the air conditioner, the supercooling degree of the condenser is obtained and is used as a basis for detecting the refrigerant leakage, and compared with a refrigerant leakage detection method in the prior art, the method can effectively improve the accuracy of the air conditioner in judging the refrigerant leakage and avoid the occurrence of misjudgment.
In the actual use process, air conditioners produced by different air conditioner manufacturers have certain differences in air conditioner type, power and types of filled refrigerants; correspondingly, the supercooling degree condition and the third threshold are different; specifically, before the air conditioner leaves the factory, the third threshold is data information pre-stored in the air conditioner data storage device by the air conditioner manufacturer according to the actual condition of the air conditioner.
And S8, normally operating the air conditioner according to a preset mode.
If the refrigerant leakage is not detected in the normal operation stage of the air conditioner, the air conditioner continues to execute the preset mode and keeps the normal operation state.
In addition, the present embodiment further describes a specific obtaining process of the condenser supercooling degree T0, that is, step S6 includes:
s601, after the air conditioner runs for T2 time, acquiring condenser outlet pressure P13 and condenser outlet temperature T13;
the method comprises the steps that refrigerant leakage does not occur in the pre-operation stage of the air conditioner, the air conditioner starts to operate according to a preset mode after the pre-operation stage is finished, and under the premise, after the air conditioner operates stably, the outlet pressure P13 and the outlet temperature T13 of the condenser are obtained by arranging a pressure sensor and a temperature sensor at the outlet of the condenser; the condenser outlet pressure P13 is an actual pressure value of the refrigerant at the condenser outlet; the condenser outlet temperature T13 is an actual temperature value of the refrigerant at the condenser outlet.
S602, acquiring a refrigerant saturation temperature T33 by the air conditioner according to the condenser outlet pressure P13;
the gas-liquid two-phase refrigerant substance has a corresponding refrigerant saturation temperature within a certain pressure range, and the gas-liquid two-phase refrigerant substance is in a dynamic balance state at the moment.
Correspondingly, before the air conditioner leaves the factory, an air conditioner manufacturer presets a refrigerant saturation temperature value corresponding to each condenser outlet pressure value in an air conditioner data storage device, or a corresponding relation between the condenser outlet pressure value and the refrigerant saturation temperature value.
In addition, if the refrigerant in the air conditioner is a single component, the single component is taken as a reference substance according to the corresponding condition between the outlet pressure value of the condenser and the saturation temperature value of the refrigerant; if the refrigerant in the air conditioner is a mixed component, the correspondence between the outlet pressure value of the condenser and the saturation temperature value of the refrigerant is preferably based on one component with the largest content.
S603, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T33 and the condenser outlet temperature T13;
the condenser supercooling degree is the supercooling degree of a refrigerant in the condenser, and is the difference between the refrigerant saturation temperature corresponding to the actual pressure of the refrigerant at the outlet of the condenser and the actual temperature of the refrigerant at the outlet of the condenser, namely the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T33-the condenser outlet temperature T13.
Therefore, through the processes of the step S601 to the step S603, the supercooling degree of the condenser can be accurately obtained, errors or deviations of data information introduced by an approximation method in the prior art are avoided, the occurrence of misjudgment caused by data deviations is reduced to the maximum extent, and the accuracy of refrigerant leakage judgment is improved.
Example 3
As shown in fig. 3, in view of detecting refrigerant leakage that may have occurred before the air conditioner is not operated, the present embodiment further supplements the description of step S1 on the basis of embodiment 1.
Step S1 includes:
s101, starting an air conditioner, and acquiring the pressure P10 of an air suction pipe when a compressor does not operate;
after the air conditioner is started, at least before the compressor does not run, the pressure of an air suction pipe of the compressor is detected, specifically, the air conditioner detects the pressure of the air suction pipe of the compressor through a pressure acquisition device, and the pressure acquisition device can be a pressure sensor or a pressure switch.
S102, judging whether the pressure P10 of the air suction pipe is smaller than a preset pressure by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S103;
after the air conditioner is operated last time and in the time period before the air conditioner is operated this time, due to the influence of aging factors, human factors, natural factors or certain ineffectiveness, the air conditioner can cause the air conditioner refrigerant pipeline or related parts to be damaged, which leads to refrigerant leakage, thereby leading the pressure in the air conditioner refrigerant pipeline to be reduced before the air conditioner is started.
S103, the air conditioner acquires relevant information before operation, and acquires a pre-operation frequency f0 according to the relevant information before operation.
The process is the same as step S1 in embodiment 1, and is not described herein.
In the embodiment, after the air conditioner is started and at least before the compressor is not operated, the pressure of the air suction pipe of the compressor is analyzed, so that the refrigerant leakage condition which is possibly generated by the air conditioner in a non-operation period can be detected more directly and timely, and the process can improve the detection lag condition when the refrigerant leakage detection is performed after the air conditioner and the compressor thereof are operated in the prior art; and if the air conditioner has the refrigerant leakage in the non-operation period, the compressor can be damaged if the air conditioner directly controls the compressor to operate after being started. Therefore, after the air conditioner is started and before the compressor operates, the refrigerant leakage can be effectively detected in time, and the compressor can be effectively protected to a certain extent.
Example 4
In order to further explain the detection process of the degree of superheat of exhaust gas in the present invention, this embodiment further explains step S3 on the basis of embodiment 1.
Specifically, the step S3 includes:
s301, obtaining the pressure P11 of the compressor exhaust pipe and the temperature T11 of the compressor exhaust pipe after the air conditioner runs for a time period T1 in advance;
after the air conditioner runs for T1 time in advance, namely after the air conditioner runs stably, the pressure of a compressor exhaust pipe P11 and the temperature of the compressor exhaust pipe T11 are obtained by arranging a pressure sensor and a temperature sensor at the compressor exhaust port; the compressor discharge pipe pressure P11 is an actual pressure value of the refrigerant in the compressor discharge pipe, and the compressor discharge pipe temperature T11 is an actual temperature value of the refrigerant in the compressor discharge pipe.
S302, the air conditioner obtains a refrigerant saturation temperature T31 according to the pressure P11 of the exhaust pipe of the compressor;
for the phase balance of the gas phase and the liquid phase of the refrigerant substance, the corresponding saturation temperature of the refrigerant exists in a certain pressure range, and the gas phase and the liquid phase are in a dynamic balance state at the moment. Correspondingly, before the air conditioner leaves the factory, an air conditioner manufacturer presets a refrigerant saturation temperature value corresponding to each compressor exhaust pipe pressure value in an air conditioner data storage device, or a corresponding relation between the compressor exhaust pipe pressure value and the refrigerant saturation temperature value.
In addition, if the refrigerant in the air conditioner is a single component, the single component is taken as a reference substance according to the corresponding situation between the pressure value of the exhaust pipe of the compressor and the saturation temperature value of the refrigerant; if the refrigerant in the air conditioner is a mixed component, the correspondence between the pressure value of the compressor discharge pipe and the saturation temperature value of the refrigerant is preferably based on one component with the largest content.
S303, the air conditioner obtains the exhaust superheat Tp according to the temperature T11 of the exhaust pipe of the compressor and the saturation temperature T31 of a refrigerant;
the discharge superheat degree is the superheat degree of the refrigerant in the compressor discharge pipe, and is the difference between the actual temperature of the refrigerant in the compressor discharge pipe and the saturation temperature corresponding to the refrigerant under the actual pressure of the refrigerant in the compressor discharge pipe, namely the discharge superheat degree Tp is the temperature T11 of the compressor discharge pipe-the saturation temperature T31 of the refrigerant.
In the present embodiment, through the processes of step S301 to step S303, the exhaust superheat degree can be accurately obtained, an error or a deviation of data information introduced by using an approximation method in the prior art is avoided, an occurrence of a misjudgment situation caused by a data deviation is reduced to the maximum extent, and an improvement of the accuracy of the refrigerant leakage judgment is facilitated.
Example 5
In order to further improve the accuracy of the air conditioner in determining the refrigerant leakage, as shown in fig. 4, in this embodiment, a method for detecting the refrigerant leakage of the air conditioner is further described in addition to embodiments 1, 2, and 3, specifically, step S4 in embodiment 1 is further described in addition to embodiment 2.
Specifically, step S4 includes:
s401, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, go to step S404; otherwise, go to step S402;
in order to improve the accuracy of refrigerant leakage detection, different detection rechecks are subsequently performed according to different determination results of the exhaust superheat degree;
specifically, when the exhaust superheat Tp is greater than the first threshold, it indicates that the air conditioner may leak refrigerant, and the step S404 is continued; when the discharge superheat Tp is not greater than the first threshold, it indicates that the air conditioner may not leak the refrigerant, and the process continues to step S402.
S402, sampling the pressure of a compressor suction pipe by an air conditioner;
the air conditioner is characterized in that a pressure acquisition device is arranged at the air suction pipe of the compressor and used for acquiring the pressure of the air suction pipe of the compressor in real time, and the pressure acquisition device can be a pressure sensor or a pressure switch.
S403, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a pressure threshold value by the air conditioner; if yes, go to step S5; otherwise, go to step S8;
wherein the pressure threshold is a pressure change value or a pressure change rate in unit time, and the value of the pressure threshold is a negative number;
compared with the external atmospheric environment, the air-conditioning refrigerant pipeline is often in a high-pressure environment, and when refrigerant leakage occurs, the pressure in the refrigerant pipeline is rapidly reduced; therefore, the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is a negative value, and when the variation or the variation rate is smaller than the pressure threshold, the air conditioner is indicated to be possible to leak the refrigerant;
correspondingly, when the exhaust superheat degree Tp is not larger than the first threshold value as a result of judgment, the air conditioner is indicated that refrigerant leakage does not occur; in order to further verify the judgment result, the change condition of the compressor suction pipe pressure is used as a first rechecking condition, and the condition that the leakage is possibly not generated is further rechecked; when the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than the pressure threshold, it indicates that misjudgment may occur in the determination process of the exhaust superheat degree, and subsequent refrigerant detection needs to be continued, that is, step S5 is performed; when the variation or the variation rate of the pressure of the suction pipe of the compressor in the preset time is not less than the pressure threshold, it is determined that the air conditioner does not leak the refrigerant, and the air conditioner operates normally, that is, step S8 is performed.
S404, the air conditioner obtains the pressure P12 of the air suction pipe of the compressor and the temperature T12 of the air suction pipe of the compressor;
the method comprises the following steps that a pressure sensor and a temperature sensor are arranged at a compressor suction port, so that the pressure P12 of a compressor suction pipe and the temperature T12 of the compressor suction pipe are obtained; the compressor intake pipe pressure P12 is an actual pressure of the refrigerant in the compressor intake pipe, and the compressor intake pipe temperature T12 is an actual temperature of the refrigerant in the compressor intake pipe.
S405, the air conditioner obtains a refrigerant saturation temperature T32 according to the pressure P12 of the suction pipe of the compressor;
correspondingly, before the air conditioner leaves the factory, an air conditioner manufacturer presets a refrigerant saturation temperature value corresponding to each compressor suction pipe pressure value in an air conditioner data storage device, or a corresponding relation between the compressor suction pipe pressure value and the refrigerant saturation temperature value. If the refrigerant in the air conditioner is a single component, the single component is taken as a reference substance according to the corresponding situation between the pressure value of the air suction pipe of the compressor and the saturation temperature value of the refrigerant; if the refrigerant in the air conditioner is a mixed component, the correspondence between the pressure value of the suction pipe of the compressor and the saturation temperature value of the refrigerant is preferably based on one component with the largest content.
S406, the air conditioner acquires suction superheat Tx according to the temperature T12 of a suction pipe of the compressor and the saturation temperature T32 of a refrigerant;
the suction superheat is the superheat of the refrigerant in the compressor suction pipe, and is the difference between the actual temperature of the refrigerant in the compressor suction pipe and the saturation temperature corresponding to the refrigerant under the actual pressure of the refrigerant in the compressor suction pipe, that is, the suction superheat Tx is equal to the compressor suction pipe temperature T12 — the refrigerant saturation temperature T32.
S407, judging whether the suction superheat Tx is larger than a second threshold value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5;
the superheat phenomenon of a refrigerant medium at the position of a compressor is the same as the exhaust superheat, and when the refrigerant leaks in the air conditioner, the suction superheat is increased along with the reduction of the refrigerant quantity under the influence of the continuous output of the power of the compressor; therefore, the condition of refrigerant leakage is further rechecked by acquiring the superheat condition of the refrigerant in the air suction pipe of the compressor and using the suction superheat as a second rechecking condition, so that on one hand, the accuracy of judgment of refrigerant leakage by the air conditioner can be more effectively improved, and the occurrence of misjudgment is avoided, and on the other hand, effective refrigerant detection can be realized for the air conditioner by two-stage detection of exhaust superheat and suction superheat, no matter a high-pressure cavity compressor or a low-pressure cavity compressor is used.
In addition, in the actual use process, the air conditioners produced by different air conditioner manufacturers have certain differences in the types and powers of the air conditioners and the types of the filled refrigerants; correspondingly, the superheat degree condition of the refrigerant in the air suction pipe of the compressor and the second threshold value are different; specifically, before the air conditioner leaves the factory, the second threshold is data information pre-stored in the air conditioner data storage device by the air conditioner manufacturer according to the actual condition of the air conditioner.
In steps S404 to S407, the condition that the refrigerant leakage of the air conditioner is likely to occur is checked to determine the degree of superheat of the exhaust gas; further rechecking the condition of refrigerant leakage possibly occurring by acquiring the suction superheat Tx and taking the suction superheat as a second rechecking condition; when the suction superheat Tx is larger than a second threshold value, determining that the air conditioner has refrigerant leakage; when the suction superheat Tx is not greater than the second threshold, it indicates that a misjudgment may occur in the determination process of the discharge superheat, particularly in the determination of the air conditioner in which the low pressure chamber compressor is installed, and the subsequent refrigerant detection needs to be continued, that is, step S5 is performed.
In the embodiment, in the pre-operation stage of the air conditioner, after the exhaust superheat degree is determined, a first rechecking condition and a second rechecking condition are set, and the determination results with different exhaust superheat degrees are rechecked respectively, so that the accuracy of refrigerant leakage detection is improved, and the occurrence of misjudgment is reduced.
Example 6
As shown in fig. 5, in order to further improve the accuracy of the air conditioner in determining refrigerant leakage, the present embodiment provides another method for detecting refrigerant leakage of an air conditioner, which specifically includes:
s01, starting the air conditioner, and acquiring the pressure P10 of the air suction pipe when the compressor does not operate;
s02, judging whether the pressure P10 of the air suction pipe is smaller than the preset pressure by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S03;
s03, the air conditioner acquires a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation;
s04, the air conditioner obtains a pre-operation frequency f0 according to a preset mode, the outdoor temperature T21 before operation and the indoor temperature T22 before operation;
s05, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s06, obtaining the pressure P11 of the compressor exhaust pipe and the temperature T11 of the compressor exhaust pipe after the air conditioner runs for a time period T1;
s07, the air conditioner obtains the refrigerant saturation temperature T31 according to the pressure P11 of the compressor exhaust pipe;
s08, the air conditioner obtains the exhaust superheat Tp according to the temperature T11 of the compressor exhaust pipe and the refrigerant saturation temperature T31;
the discharge superheat Tp is the compressor discharge pipe temperature T11 — refrigerant saturation temperature T31.
S09, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, go to step S12; otherwise, go to step S10;
s10, sampling the pressure of the compressor suction pipe by the air conditioner;
s11, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a pressure threshold value by the air conditioner; if yes, go to step S16; otherwise, go to step S22;
s12, the air conditioner acquires the pressure P12 of the air suction pipe of the compressor and the temperature T12 of the air suction pipe of the compressor;
s13, the air conditioner obtains the refrigerant saturation temperature T32 according to the pressure P12 of the compressor suction pipe;
s14, the air conditioner obtains the suction superheat Tx according to the temperature T12 of the suction pipe of the compressor and the saturation temperature T32 of the refrigerant;
the suction superheat Tx is the compressor suction pipe temperature T12 — refrigerant saturation temperature T32.
S15, judging whether the suction superheat Tx is larger than a second threshold value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S16;
s16, finishing the pre-operation of the air conditioner, operating according to a preset mode, and controlling the counter to return to zero;
s17, after the air conditioner runs for a time period of T2, acquiring the outlet pressure P13 and the outlet temperature T13 of the condenser;
s18, the air conditioner obtains the refrigerant saturation temperature T33 according to the condenser outlet pressure P13;
s19, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T33 and the condenser outlet temperature T13, and the count value of the counter is controlled to be increased by 1;
the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T33 — the condenser outlet temperature T13.
S20, judging whether the condenser supercooling degree T0 is smaller than a third threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S21;
s21, judging whether the count value of the counter is smaller than a preset count value by the air conditioner; if yes, return to step S17; otherwise, go to step S22;
in order to ensure the detection accuracy and avoid misjudgment caused by single detection and analysis of the condenser supercooling degree, the detection and analysis times of the condenser supercooling degree are judged after the condenser supercooling degree is judged that the air conditioner does not leak the refrigerant; the counting process is set, the air conditioner is subjected to multiple detection processing at the operation stage of the preset mode, accuracy of judgment of refrigerant leakage by the air conditioner is further improved, misjudgment is avoided, and effective detection and protection are performed on refrigerant leakage which possibly occurs at any time in the use process of the air conditioner.
S22, normally operating the air conditioner according to a preset mode;
s23, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S16; otherwise, the process returns to step S22.
The step S23 is performed to enable the air conditioner to operate when the air conditioner is started up, perform detection and analysis on corresponding refrigerant leakage, determine that no refrigerant leakage occurs, operate the air conditioner normally according to the preset mode, and after the operation reaches the preset duration, return to the step S16 to perform detection and analysis on the refrigerant leakage again, thereby forming a closed detection and analysis process.
Example 7
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 6. Specifically, the air conditioner includes:
the central processing unit is used for processing the related information of the refrigerant leakage of the air conditioner, including analyzing and processing related data, sending corresponding control instructions to related components of the air conditioner and the like;
the first pressure sensor is arranged at an air suction port of the compressor, is connected with the central processing unit and is used for acquiring the pressure of an air suction pipe of the compressor;
the second pressure sensor is arranged at the exhaust port of the compressor, is connected with the central processing unit and is used for acquiring the pressure of the exhaust pipe of the compressor;
the third pressure sensor is arranged at the outlet of the condenser, and is connected with the central processing unit and used for acquiring the outlet pressure of the condenser;
the first temperature sensor is arranged at the outlet of the condenser, connected with the central processing unit and used for acquiring the outlet temperature of the condenser;
the second temperature sensor is arranged on the shell of the air-conditioning indoor unit and is connected with the central processing unit for acquiring the indoor temperature;
the third temperature sensor is arranged on the shell of the air conditioner outdoor unit and is connected with the central processing unit and used for acquiring the outdoor temperature;
the fourth temperature sensor is arranged at the exhaust port of the compressor, is connected with the central processing unit and is used for acquiring the temperature of the exhaust pipe of the compressor;
the fifth temperature sensor is arranged at the air suction port of the compressor, is connected with the central processing unit and is used for acquiring the temperature of the air suction pipe of the compressor;
the counter is connected with the central processing unit and is used for counting in the detection process;
and the memory is connected with the central processing unit and used for storing the related data of the air-conditioning refrigerant leakage.
Wherein, the related data stored in the memory at least comprises the data related to the air conditioner operation mode, the operation frequency related to the compressor, the corresponding relation between the pre-operation frequency and the parameters such as the preset mode, the outdoor temperature T21 before operation, the indoor temperature T22 before operation, and the like, the preset pressure, the first threshold, the second threshold, the third threshold, the pressure threshold, the refrigerant saturation temperature value corresponding to the pressure value of the exhaust pipe of different compressors (or the corresponding relation between the pressure value of the exhaust pipe of the compressor and the refrigerant saturation temperature value), the refrigerant saturation temperature value corresponding to the pressure value of the suction pipe of different compressors (or the corresponding relation between the pressure value of the suction pipe of the compressor and the refrigerant saturation temperature value), the refrigerant saturation temperature value corresponding to the outlet pressure value of different condensers (or the corresponding relation between the outlet pressure value of the condenser and the refrigerant saturation temperature value), and, the preset time length, the operation time length of each stage and the like.
In particular, the memory comprises storage media of at least one of the following storage media types: a flash memory type, a hard disk type, a Solid State Disk (SSD) type, a Silicon Disk Drive (SDD) type, a multimedia card micro type, a card type memory (SD or XD memory type), a Random Access Memory (RAM) type, a Static Random Access Memory (SRAM) type, a Read Only Memory (ROM) type, an Electrically Erasable Programmable Read Only Memory (EEPROM) type, a Programmable Read Only Memory (PROM) type, a magnetic memory type, a magnetic disk type, and an optical disk type.
On the basis of the structure of the air conditioner 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; in addition, it should be noted that the air conditioning structure or the components in the embodiment may be obtained commercially or produced by conventional processing.
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 leakage of refrigerant of an air conditioner is characterized by comprising the following steps:
s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation;
s2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s3, obtaining the exhaust superheat Tp after the air conditioner is operated for a time of t1 in advance;
s4, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5;
and S5, finishing the pre-operation of the air conditioner and operating according to a pre-set mode.
2. The method as claimed in claim 1, wherein the pre-operation related information includes a preset mode, a pre-operation outdoor temperature T21, a pre-operation indoor temperature T22;
the preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user.
3. The method as claimed in claim 1, wherein the step S1 includes:
s101, starting an air conditioner, and acquiring the pressure P10 of an air suction pipe when a compressor does not operate;
s102, judging whether the pressure P10 of the air suction pipe is smaller than a preset pressure by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S103;
s103, the air conditioner acquires relevant information before operation, and acquires a pre-operation frequency f0 according to the relevant information before operation.
4. The method as claimed in claim 1, wherein the step S3 includes:
s301, obtaining the pressure P11 of the compressor exhaust pipe and the temperature T11 of the compressor exhaust pipe after the air conditioner runs for a time period T1 in advance;
s302, the air conditioner obtains a refrigerant saturation temperature T31 according to the pressure P11 of the exhaust pipe of the compressor;
s303, the air conditioner obtains the exhaust superheat Tp according to the temperature T11 of the exhaust pipe of the compressor and the saturation temperature T31 of a refrigerant;
the discharge superheat Tp is the compressor discharge pipe temperature T11 — refrigerant saturation temperature T31.
5. The method for detecting refrigerant leakage of an air conditioner as claimed in claim 1, wherein after step S5, the method further comprises:
s6, after the air conditioner runs for a time period of T2, obtaining the supercooling degree T0 of the condenser;
s7, judging whether the condenser supercooling degree T0 is smaller than a third threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S8;
and S8, normally operating the air conditioner according to a preset mode.
6. The method as claimed in claim 5, wherein the step S4 includes:
s401, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, go to step S404; otherwise, go to step S402;
s402, sampling the pressure of a compressor suction pipe by an air conditioner;
s403, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a pressure threshold value by the air conditioner; if yes, go to step S5; otherwise, go to step S8;
s404, the air conditioner obtains the pressure P12 of the air suction pipe of the compressor and the temperature T12 of the air suction pipe of the compressor;
s405, the air conditioner obtains a refrigerant saturation temperature T32 according to the pressure P12 of the suction pipe of the compressor;
s406, the air conditioner acquires suction superheat Tx according to the temperature T12 of a suction pipe of the compressor and the saturation temperature T32 of a refrigerant;
s407, judging whether the suction superheat Tx is larger than a second threshold value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S5;
the suction superheat Tx is the compressor suction pipe temperature T12 — refrigerant saturation temperature T32.
7. The method as claimed in claim 5, wherein the step S6 includes:
s601, after the air conditioner runs for T2 time, acquiring condenser outlet pressure P13 and condenser outlet temperature T13;
s602, acquiring a refrigerant saturation temperature T33 by the air conditioner according to the condenser outlet pressure P13;
s603, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T33 and the condenser outlet temperature T13;
the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T33 — the condenser outlet temperature T13.
8. A method for detecting leakage of refrigerant of an air conditioner is characterized by comprising the following steps:
s01, starting the air conditioner, and acquiring the pressure P10 of the air suction pipe when the compressor does not operate;
s02, judging whether the pressure P10 of the air suction pipe is smaller than the preset pressure by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S03;
s03, the air conditioner acquires a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation;
s04, the air conditioner obtains a pre-operation frequency f0 according to a preset mode, the outdoor temperature T21 before operation and the indoor temperature T22 before operation;
s05, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s06, obtaining the pressure P11 of the compressor exhaust pipe and the temperature T11 of the compressor exhaust pipe after the air conditioner runs for a time period T1;
s07, the air conditioner obtains the refrigerant saturation temperature T31 according to the pressure P11 of the compressor exhaust pipe;
s08, the air conditioner obtains the exhaust superheat Tp according to the temperature T11 of the compressor exhaust pipe and the refrigerant saturation temperature T31;
s09, judging whether the exhaust superheat Tp is larger than a first threshold value by the air conditioner; if yes, go to step S12; otherwise, go to step S10;
s10, sampling the pressure of the compressor suction pipe by the air conditioner;
s11, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a pressure threshold value by the air conditioner; if yes, go to step S16; otherwise, go to step S22;
s12, the air conditioner acquires the pressure P12 of the air suction pipe of the compressor and the temperature T12 of the air suction pipe of the compressor;
s13, the air conditioner obtains the refrigerant saturation temperature T32 according to the pressure P12 of the compressor suction pipe;
s14, the air conditioner obtains the suction superheat Tx according to the temperature T12 of the suction pipe of the compressor and the saturation temperature T32 of the refrigerant;
s15, judging whether the suction superheat Tx is larger than a second threshold value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S16;
s16, finishing the pre-operation of the air conditioner, operating according to a preset mode, and controlling the counter to return to zero;
s17, after the air conditioner runs for a time period of T2, acquiring the outlet pressure P13 and the outlet temperature T13 of the condenser;
s18, the air conditioner obtains the refrigerant saturation temperature T33 according to the condenser outlet pressure P13;
s19, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T33 and the condenser outlet temperature T13, and the count value of the counter is controlled to be increased by 1;
s20, judging whether the condenser supercooling degree T0 is smaller than a third threshold value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S21;
s21, judging whether the count value of the counter is smaller than a preset count value by the air conditioner; if yes, return to step S17; otherwise, go to step S22;
s22, normally operating the air conditioner according to a preset mode;
s23, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S16; otherwise, the process returns to step S22.
9. The refrigerant leakage detecting method of claim 8, wherein the discharge superheat Tp is the compressor discharge temperature T11-refrigerant saturation temperature T31;
suction superheat Tx ═ compressor suction pipe temperature T12 — refrigerant saturation temperature T32;
the condenser subcooling degree T0 is equal to the refrigerant saturation temperature T33 — the condenser outlet temperature T13.
10. An air conditioner, characterized in that the air conditioner adopts the air conditioner refrigerant leakage detection method as claimed in any one of claims 1 to 9.
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