CN110895026A - Air conditioner refrigerant leakage detection method and air conditioner using same - Google Patents

Air conditioner refrigerant leakage detection method and air conditioner using same Download PDF

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CN110895026A
CN110895026A CN201811064148.6A CN201811064148A CN110895026A CN 110895026 A CN110895026 A CN 110895026A CN 201811064148 A CN201811064148 A CN 201811064148A CN 110895026 A CN110895026 A CN 110895026A
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temperature
air conditioner
refrigerant
difference
preset
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CN110895026B (en
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白韡
许真鑫
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Aux Air Conditioning Co Ltd
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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
    • F24F11/52—Indication arrangements, e.g. displays
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner refrigerant leakage detection method, which comprises the following steps: acquiring an average temperature value of a coil pipe of the generator and an average temperature value of the windward side of the evaporator; primarily judging whether refrigerant leakage occurs or not; acquiring a second difference value; determining whether the first difference belongs to a first temperature interval or a second temperature interval according to the change condition of the first difference; judging whether the air conditioner has refrigerant leakage according to the percentage change of the flow of the refrigerant quantity in the air conditioning system; judging whether the duration time of the first difference value in a second temperature interval is greater than a second preset time or not and whether the second difference value is greater than or equal to a third preset temperature difference or not; and calculating the leakage amount of the refrigerant according to the actual operating power of the compressor and the theoretical operating power of the air conditioner, and determining the operating strength and the operating time of the indoor fan motor according to the leakage amount of the refrigerant. The invention has the beneficial effects that: (1) the air conditioner has higher judgment accuracy on refrigerant leakage; (2) the refrigerant is effectively recovered when the refrigerant leakage is judged to occur.

Description

Air conditioner refrigerant leakage detection method and air conditioner using same
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 using the same.
Background
With the improvement of the living standard of people, the popularization rate of air conditioners is higher and higher, and in the face of large-area popularization of the air conditioners, the maintenance of the air conditioners is correspondingly frequent, various air conditioner problems in the market are endless, and a reasonable solution cannot be found for the refrigerant leakage problem of the air conditioners all the time, various leakage problems in the market at present, such as welding leakage of an internal machine evaporator, leakage of a connecting pipe, leakage of an external machine condenser, leakage caused by pipeline breakage of a four-way valve, and the like, once leakage occurs, a user can usually find the maintenance when the refrigerating and heating effects of the air conditioners become extremely poor. To the refrigerant condition of leaking, adopt in the prior art mostly more rationally and exquisite modes such as preventing leaking pipeline valve interface of design structure to place the refrigerant and leak, in practice, these prevent leaking valve and interface and have reduced the possibility that the leakage takes place to a great extent really. The leakage detection method suitable for the method is not improved, namely the leakage detection is not carried out by using a method of carrying out one-time judgment on a single air conditioner parameter, but the judgment is carried out by comprehensively using the parameters of various air conditioner systems, so that the phenomenon that the air conditioner is repeatedly protected and shut down due to misjudgment of air conditioner refrigerant leakage is avoided.
Disclosure of Invention
The invention aims to provide an air conditioner refrigerant leakage detection method and an air conditioner using the same, so that the accuracy of judgment of refrigerant leakage by the air conditioner is higher.
Specifically, the invention is realized by the following technical scheme:
a method for detecting leakage of refrigerant of an air conditioner comprises the following steps:
s1: obtaining the average temperature T of the first evaporator coil2AveAnd the average value T of the temperature of the windward side of the first evaporator1Ave；
S2: initially judging whether refrigerant leakage occurs or not, and if yes, acquiring the change condition of a first difference value between the indoor environment temperature and the average value of the first evaporator coil temperature;
s3: obtaining a second difference between the compressor discharge temperature and the average of the first evaporator coil temperature;
s4: determining whether the first difference belongs to a first temperature interval or a second temperature interval according to the change condition of the first difference, if the first difference belongs to the first temperature interval, executing S5, and if the first difference belongs to the second temperature interval, executing S7;
s5: judging whether the second difference value is smaller than or equal to a first preset temperature difference, if so, executing S6, and if not, executing S8;
s6: judging whether the air conditioner has refrigerant leakage according to the percentage change of the refrigerant quantity flow in the air conditioning system, if so, executing S9, and if not, returning to S1;
s7: judging whether the duration time of the first difference value in a second temperature interval is greater than a second preset time or not, and whether the second difference value is greater than or equal to a third preset temperature difference or not, if so, executing S8, and if not, returning to S1;
s8: according to the average value T of the temperature of the windward side of the second evaporator1ucAnd the second evaporator coil temperature average value T2ucJudging whether the air conditioner has refrigerant leakage or not according to the return air temperature of the condenser, the exhaust temperature of the compressor and the working current of the compressor, if so, executing S9, and if not, executing S1;
s9: calculating the refrigerant leakage amount of the air conditioner according to the actual operating power of an air conditioner compressor and the theoretical operating power of the air conditioner, and determining the operating strength and the operating time of an indoor fan motor according to the refrigerant leakage amount;
s10: and collecting the refrigerant in the outdoor unit and giving an alarm.
Preferably, the S1 includes:
s11: starting the air conditioner, obtaining the temperature of the coil of the evaporator of the air conditioner for multiple times and the average value T of the temperature of the windward side of the first evaporator1Ave；
S12: calculating the average value of the obtained temperatures of the plurality of evaporator coils as the average value T of the temperatures of the first evaporator coil2Ave。
Preferably, the S2 includes:
s21: judgment of T2AveWhether the temperature value of each coil is larger than or equal to the first preset temperature or not and whether the temperature value of each coil is within a preset temperature range or not are judged, if yes, S22 is executed, and if not, S1 is returned;
s22: and acquiring a first difference value between the indoor environment temperature and the average value of the coil temperature, continuously counting first preset time, and drawing a 'first difference value-time' curve.
Preferably, the S4 includes:
s41: calculating the probability of whether the first difference value is in the first temperature interval or the second temperature interval;
s42: and determining whether the first difference value belongs to the first temperature interval or the second temperature interval according to the floating condition of the first difference value in the 'first difference value-time' curve, and executing S5 if the first difference value belongs to the first temperature interval, and executing S7 if the first difference value belongs to the second temperature interval.
Preferably, the S6 includes:
s61: calculating the percentage change number of the cold medium amount flow in the air conditioning system, and then executing S62;
s62: judging whether the refrigerant mass flow change percentage exceeds a preset percentage, if so, executing S9, and if not, executing S63;
s63: after determining that the air conditioner is not leaking refrigerant, S1 is executed.
Preferably, before the S8 and after S5, the method further comprises:
s6': and (5) judging whether the detection times in the step (S5) exceed the preset detection times, if so, executing S8, otherwise, returning to S5.
Preferably, the S8 includes:
s81: judging whether the running time of the compressor reaches a third preset time or not, if so, obtaining the average value T of the second windward temperature of the evaporator again every fourth preset time1ucAnd the second evaporator coil temperature average value T2ucAnd when the running time of the compressor reaches a fifth preset time, obtainingTaking the return air temperature of a condenser, the exhaust temperature of a compressor and the working current of the compressor;
s82: judging whether the return air temperature of the condenser is greater than the second preset temperature and less than or equal to a third preset temperature T1ucAnd T2ucWhether the absolute value of the difference is less than a first preset refrigeration temperature value T2AveAnd T2ucWhether the absolute value of the difference is less than a second preset refrigeration temperature value T1AveAnd T1ucWhether the absolute value of the difference is less than a fourth preset temperature, whether the exhaust temperature of the compressor is greater than a fifth preset temperature and whether the working current of the compressor is less than a first preset current or not, if not, executing S1, and if so, executing S83;
s83: and judging the refrigerant leakage of the air conditioner.
Preferably, the S9 includes:
s91: acquiring actual operating power of an air conditioner compressor and theoretical operating power of an air conditioner;
s92: calculating the refrigerant leakage amount of the air conditioner according to the theoretical operating power corresponding to different leakage amounts of the refrigerant;
s93: and controlling the indoor fan motor to operate in strong wind according to the leakage amount of the refrigerant, and timing the operation time in strong wind.
Preferably, the S10 includes:
s101: controlling a three-way valve at a refrigerant outlet of the compressor to change the conduction direction, and conducting the refrigerant discharged from the compressor into the compressor again;
s102: and after the strong wind runs for the sixth preset time, the air conditioner is stopped and an alarm is given out.
An air conditioner using the air conditioner refrigerant leakage detection method according to any one of claims 1 to 9.
The invention has the beneficial effects that: (1) the air conditioner has higher judgment accuracy on refrigerant leakage; (2) the refrigerant is effectively recovered when the refrigerant leakage is judged to occur.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an overall structure of an air conditioner according to the present invention;
FIG. 2 is a logic diagram of a method for detecting refrigerant leakage of an air conditioner according to the present invention;
FIG. 3 is a logic diagram illustrating the step S1 in FIG. 2;
FIG. 4 is a logic diagram illustrating the step S2 in FIG. 2;
FIG. 5 is a graph of "first Difference versus time";
FIG. 6 is a logic diagram illustrating the step S4 in FIG. 2;
FIG. 7 is a logic diagram illustrating the step S6 in FIG. 2;
FIG. 8 is a logic diagram of step S6';
FIG. 9 is a logic diagram illustrating the step S8 in FIG. 2;
FIG. 10 is a logic diagram illustrating the step S9 in FIG. 2;
fig. 11 is a schematic logic diagram of step S10 in fig. 2.
Description of the reference numerals
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described.
10-an indoor unit; 20-an outdoor unit; 1-an evaporator; 2-a condenser; 3-a four-way valve; 4-a gas-liquid separator; 5-a compressor; 21-outdoor temperature sensor; 11-an air outlet temperature sensor; 12-return air temperature sensor; 6-three-way valve; 7-electromagnetic valve.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in detail below by way of examples.
An air conditioner, as shown in fig. 1, includes an indoor unit 10 located at an indoor side and an outdoor unit 20 located at an outdoor side, the indoor unit 10 and the outdoor unit 20 are connected to form a circulation loop through a pipeline, the indoor unit 10 includes an evaporator 1, and the outdoor unit 20 includes a condenser 2.
The air conditioner also comprises a four-way valve 3, a gas-liquid separator 4 and a compressor 5, wherein an outdoor temperature sensor 21 is arranged on the condenser 2, and an outlet air temperature sensor 11 and an return air temperature sensor 12 are arranged on the evaporator 1.
An electromagnetic valve 7 is arranged at a refrigerant inlet end of the compressor 5, a three-way valve 6 is arranged on a pipeline connecting the condenser 2 and the evaporator 1, a first interface a of the three-way valve 6 is connected with a refrigerant outlet end of the condenser 2, a second interface b of the three-way valve 6 is connected with a refrigerant inlet end of the evaporator 1, and a third interface c of the three-way valve 6 is connected with one end of the electromagnetic valve 7. The other end of the solenoid valve 7 is connected to the four-way valve 3.
The first port a and the third port c of the three-way valve 6 are connected between the solenoid valve 7 and the compressor 5. Signal lines for controlling the opening and closing of the three-way valve 6 and the solenoid valve 7 are electrically connected to a control unit (not shown in the figure), respectively. After the three-way valve 6 is electrified, the first interface a and the second interface b are communicated; and after power failure, the first interface a and the third interface c are conducted.
When the air conditioner is normally used for refrigeration, the three-way valve 6 is electrified, a first passage (a passage formed by conducting the first interface a and the second interface b) of the three-way valve 6 is communicated, a refrigerant is discharged from the compressor 5, flows to the condenser 2 through the four-way valve 3 to exchange heat, then flows to the evaporator 1 through the first interface a and the second interface b of the three-way valve 6 to absorb heat and evaporate, and then flows back to the compressor 5 through the electromagnetic valve 7.
When it is determined that the refrigerant leaks, the three-way valve 6 is turned off, the first path of the three-way valve 6 is disconnected, the second path (the path formed by the first port a and the third port c being connected) of the three-way valve 6 is connected, and the refrigerant returns to the compressor 5 from the first port a of the three-way valve 6 through the third port c, and at the same time, the solenoid valve 7 is closed, thereby preventing the refrigerant in the second path from flowing to the indoor unit.
Meanwhile, the evaporator 1 is also provided with a coil temperature sensor 11 and a windward temperature sensor 12.
The invention provides an air conditioner refrigerant leakage detection method, which uses the air conditioner, and as shown in figure 2, the method comprises the following steps:
s1: obtaining the average temperature T of the first evaporator coil2AveAnd the average value T of the temperature of the windward side of the first evaporator1Ave。
S2: and initially judging whether refrigerant leakage occurs or not, and if so, acquiring the change condition of a first difference value between the indoor environment temperature and the average value of the first evaporator coil temperature.
S3: a second difference between the compressor discharge temperature and the average of the first evaporator coil temperature is obtained.
Specifically, the temperature of an air outlet of an air conditioner compressor, namely the exhaust temperature, is detected; in addition, the exhaust temperature can be detected by an exhaust port temperature sensor, and the exhaust port temperature sensor can be arranged at the exhaust port of the air conditioner compressor.
S4: and determining whether the first difference belongs to the first temperature interval or the second temperature interval according to the change condition of the first difference, executing S5 if the first difference belongs to the first temperature interval, and executing S7 if the first difference belongs to the second temperature interval.
S5: and judging whether the second difference value is smaller than or equal to a first preset temperature difference, if so, executing S6, and if not, executing S8.
S6: and judging whether the air conditioner has refrigerant leakage according to the percentage change of the refrigerant quantity flow in the air conditioning system, if so, executing S9, and if not, returning to S1.
S7: and judging whether the duration time of the first difference value in the second temperature interval is greater than a second preset time or not, and whether the second difference value is greater than or equal to a third preset temperature difference or not, if so, executing S8, and if not, returning to S1.
S8: according to the average value T of the temperature of the windward side of the second evaporator1ucAnd the second evaporator coil temperature average value T2ucAnd judging whether the air conditioner has refrigerant leakage or not by the return air temperature of the condenser, the exhaust temperature of the compressor and the working current of the compressor, if so, executing S9, and if not, executing S1.
S9: according to the actual operating power of an air conditioner compressor and the theoretical operating power of the air conditioner, the refrigerant leakage amount of the air conditioner is calculated, and the operating strength and the operating time of an indoor fan motor are determined according to the refrigerant leakage amount.
S10: and collecting the refrigerant in the outdoor unit and giving an alarm.
Specifically, as shown in fig. 3, the step S1 includes:
s11: starting up the air conditioner, obtaining the temperature of the air conditioner evaporator coil for multiple times, and the first evaporatorAverage value T of windward temperature1Ave。
The coil temperature of the evaporator and the temperature of the windward side of the evaporator can be detected by the coil temperature sensor 11 and the windward side temperature sensor 12. The average value T of the temperature of the windward side of the first evaporator obtained in step S111AveThe average value of the temperatures of the windward sides of the evaporators measured at the time of starting the air conditioner and the average value T of the windward sides of the second evaporator below are measured1ucA distinction should be made.
S12: calculating the average value of the obtained temperatures of the plurality of evaporator coils as the average value T of the temperatures of the first evaporator coil2Ave。
In order to eliminate the condition of inaccurate temperature caused by single measured coil temperature, the average value of the more measured coil temperatures is calculated, and the obtained average value of the coil temperatures is used as the actual measured coil temperature value. The average value T of the first evaporator coil temperature obtained in step S122AveAverage evaporator coil temperature values measured for the air conditioner at the time of start-up, and the following average evaporator coil temperature value T2ucA distinction should be made.
Specifically, as shown in fig. 4, S2 includes:
s21: judgment of T2AveAnd (4) whether the temperature value of each coil is larger than or equal to the first preset temperature or not and whether the temperature value of each coil is within a preset temperature range or not, if so, executing S22, and if not, returning to S1.
The method comprises the steps of measuring the temperature of a coil of an evaporator within 5 minutes after a compressor in an air conditioning system is started, obtaining the temperature of the coil of the evaporator once every 4 seconds, calculating the average value of the temperature of the coil after timing for 5 minutes, and judging whether the temperature value of each coil is within a preset temperature range when the average value of the temperature of the coil is larger than or equal to a first preset temperature. And whether the temperature value of each coil is within a preset temperature range needs to be judged, the preset temperature range is the coil temperature range with refrigerant leakage preliminarily determined through multiple tests when the coil leaves a factory, namely, after the refrigerant leakage is determined to possibly occur through S3 preliminary detection, the following further detection steps are executed.
S22: and acquiring a first difference value between the indoor environment temperature and the average value of the coil temperature, continuously counting first preset time, and drawing a 'first difference value-time' curve.
As shown in fig. 5, a graph of "first difference value-time" is shown, wherein the horizontal axis represents time, the duration of the horizontal axis represents a first predetermined time, and the vertical axis represents a value of the first difference value.
The accuracy of the first difference may be set to different values to calculate and produce a corresponding "first difference-time" curve as quickly as possible, in order to accommodate the processing speed of the processor in the air conditioning controller.
Since the temperature of the air conditioner varies in different degrees during the cooling process, the first difference in the embodiment of the present invention may be set with different accuracies (1 ℃, 0.1 ℃, 0.2 ℃, etc.). For example, if the first difference at the current time is 3 ℃, after 1min, the first difference is 3.5 ℃, and after 1min, the first difference is 4 ℃, then if the precision is 1 ℃, it may be considered that the first difference is 3 ℃ for 2min in the above process; if the accuracy is 0.1 ℃, it is considered that the first difference is 3 ℃ for 1min in the above process. The first preset time may be set according to a model, a device used, and the like of the air conditioner, which is not limited in the present invention.
The indoor environment temperature can be detected by an indoor temperature sensor arranged outside the indoor unit, and the indoor temperature sensor can be arranged on the indoor unit of the air conditioner; the temperature of the indoor coil can be detected by an inner coil temperature sensor, and the inner coil temperature sensor can be arranged on the coil of the indoor unit.
Specifically, as shown in fig. 6, the S4 includes:
s41: a probability of whether the first difference is in the first temperature interval or the second temperature interval is calculated.
In the schematic diagram of the "first difference value-time" curve, the "first difference value-time" curve may be entirely within one temperature interval, or may be jittered within the first temperature interval and the second temperature interval, and it may be determined which temperature interval the first difference value belongs to at the second preset time by calculating the occurrence probability of the first difference value-time "curve within the two temperature intervals.
S42: and determining whether the first difference value belongs to the first temperature interval or the second temperature interval according to the floating condition of the first difference value in the 'first difference value-time' curve, and executing S5 if the first difference value belongs to the first temperature interval, and executing S7 if the first difference value belongs to the second temperature interval.
If the first difference belongs to the first temperature interval, the difference between the temperature of the coil of the air conditioner evaporator and the indoor environment temperature is small, and if the first difference belongs to the second temperature interval, the difference between the temperature of the coil of the air conditioner evaporator and the indoor environment temperature is large.
Specifically, an integral area between a "first difference value-time" curve and a temperature division line of a first temperature interval and a second temperature interval may be calculated to determine whether the first difference value belongs to the first temperature interval or the second temperature interval, the integral area being an area covered between the first difference value curve and the temperature division line, and when the first difference value curve is below the temperature division line, the area covered between the first difference value curve and the temperature division line is regarded as the first integral area; when the first difference curve is above the temperature division line, the area covered between the first difference curve and the temperature division line is recorded as a second integral area, if the proportion of any one integral area to the total integral area exceeds a preset area proportion, the first difference is judged to belong to the temperature interval in which the integral area is located, for example, when the proportion of the first integral area to the total integral area is calculated to exceed 70%, the first difference is judged to belong to the first temperature interval.
Specifically, as shown in fig. 7, the S6 includes:
s61: the percentage change of the cold medium amount flow in the air conditioning system is calculated and then S62 is executed.
Specifically, the current outdoor environment temperature is obtained;
searching the normal refrigerant mass flow Q corresponding to the current outdoor environment temperature from the corresponding relation between the outdoor environment temperature and the normal refrigerant mass flow;
obtaining the current compressor suction temperature tSuction deviceAnd the current temperature t of the evaporatorSteaming food；
Setting the current temperature t of the evaporatorSteaming foodSubstituting into formula t'Suction device＝tSteaming food+ delta t, calculating to obtain the saturation temperature t 'at the air suction port of the current compressor'Suction deviceWherein, Δ t is the compensation temperature;
finding out saturation temperature t 'at the current compressor suction port from a prestored corresponding relation between saturation temperature and saturation pressure at the compressor suction port'Suction deviceCorresponding current saturation pressure pSuction device；
Searching the corresponding relation between the pre-stored compressor suction temperature, saturation pressure and compressor suction specific volume and the current compressor suction temperature tSuction deviceAnd said current saturation pressure pSuction deviceCorresponding current compressor specific suction volume vSuction device；
Setting the current compressor suction specific volume vSuction deviceSubstituting formula qm-qV/vSuction deviceCalculating to obtain the mass flow qm of the current refrigerant, wherein the volume flow qV of the compressor is a fixed value in the fixed-frequency compressor;
substituting the current refrigerant mass flow qm and the normal refrigerant mass flow Q into a formula delta qm-Q, and calculating to obtain a refrigerant mass flow variable delta qm;
and if the refrigerant mass flow change amount delta qm is smaller than zero, substituting the refrigerant mass flow change amount delta qm and the normal refrigerant mass flow Q into a formula η ═ delta qm |/Q%, and calculating to obtain a refrigerant mass flow change percentage η.
S62: and judging whether the refrigerant mass flow change percentage exceeds a preset percentage, if so, executing S9, and if not, executing S63.
S63: after determining that the air conditioner is not leaking refrigerant, S1 is executed.
The judgment of S62 and S63 can effectively avoid the refrigerant leakage misjudgment in the step S4, and the step S6 contains more data calculation and occupies more resources of the controller CPU, so the step S6 is placed after S5 for accurate detection, and the complex data calculation of the step S6 executed by the program for multiple times can be effectively avoided.
Further, as shown in fig. 8, before S8 and after S5, the method may further include:
s6': and (5) judging whether the detection times in the step (S5) exceed the preset detection times, if so, executing S8, otherwise, returning to S5.
Specifically, as shown in fig. 9, the S8 includes:
s81: judging whether the running time of the compressor reaches a third preset time or not, if so, obtaining the average value T of the second windward temperature of the evaporator again every fourth preset time1ucAnd the second evaporator coil temperature average value T2ucAnd when the running time of the compressor reaches fifth preset time, acquiring the return air temperature of the condenser, the exhaust temperature of the compressor and the working current of the compressor.
S82: judging whether the return air temperature of the condenser is greater than the second preset temperature and less than or equal to a third preset temperature T1ucAnd T2ucWhether the absolute value of the difference is less than a first preset refrigeration temperature value T2AveAnd T2ucWhether the absolute value of the difference is less than a second preset refrigeration temperature value T1AveAnd T1ucWhether the absolute value of the difference is less than a fourth preset temperature, whether the exhaust temperature of the compressor is greater than a fifth preset temperature and whether the working current of the compressor is less than the first preset current, if not, executing S1, and if so, executing S83.
S83: and judging the refrigerant leakage of the air conditioner.
Specifically, as shown in fig. 10, the S9 includes:
s91: and acquiring the actual operating power of an air conditioner compressor and the theoretical operating power of the air conditioner under the current working condition.
Specifically, detecting the actual working voltage and the actual working current of the air conditioner; and calculating the actual operation power according to the actual operation voltage and the actual operation current. The actual operating power of the air conditioner may be obtained by calculating a product of an actual operating voltage and an actual operating current of the air conditioner. The theoretical operating power of the air conditioner under any operating condition can be calculated by the following formula:
ΔP＝Ps+A×(Tout-Ta_out)+B×(Tin-Ta_in)
wherein, the delta P is the theoretical operating power of the air conditioner under any working condition; psThe theoretical operating power of the air conditioner under the standard working condition is a value measured under the rated refrigeration working condition; t isoutIs the outdoor ambient temperature; t isinIs the indoor ambient temperature; t isa_outIs the outdoor ambient temperature under standard working conditions; t isa_inIs the indoor ambient temperature under standard working conditions; a is an outdoor environment temperature correction coefficient; b is an indoor ambient temperature correction coefficient, and Ps、Ta_out、Ta_inA and B can be obtained by factory tests.
S92: and calculating the refrigerant leakage amount of the air conditioner under the current working condition according to the theoretical operating power corresponding to different leakage amounts of the refrigerant.
Specifically, for example, the actual operating power is P, and the theoretical operating power is P1And P2And P is1Corresponding refrigerant leakage amount is f1And P is2Corresponding refrigerant leakage amount is f2Then can pass through the formula
Figure BDA0001797879030000121
And calculating the leakage amount f of the refrigerant.
S93: and controlling the indoor fan motor to operate in strong wind according to the leakage amount of the refrigerant, and timing the operation time in strong wind.
Specifically, the operating intensity and the operating time of the indoor fan motor can be determined through a preset refrigerant leakage amount and operating intensity and operating time comparison table of the indoor fan motor.
Specifically, as shown in fig. 11, the S10 includes:
s101: and controlling a three-way valve at a refrigerant outlet of the compressor to change the conduction direction, and conducting the refrigerant discharged from the compressor to the inside of the compressor again.
As shown in fig. 1, when it is determined that the refrigerant leaks, the three-way valve 6 is turned off, the first path of the three-way valve 6 is disconnected, the second path (a path formed by the first port a and the third port c being connected) of the three-way valve 6 is connected, and the refrigerant returns to the compressor 5 from the first port a of the three-way valve 6 through the third port c, and at the same time, the solenoid valve 7 is closed, thereby preventing the refrigerant in the second path from flowing to the indoor unit.
S102: and after the strong wind runs for the sixth preset time, the air conditioner is stopped and an alarm is given out.
The invention also provides an air conditioner using any one of the air conditioner refrigerant leakage detection methods.
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 made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method for detecting leakage of refrigerant of an air conditioner is characterized by comprising the following steps:
s1: obtaining the average temperature T of the first evaporator coil2AveAnd the average value T of the temperature of the windward side of the first evaporator1Ave；
S2: initially judging whether refrigerant leakage occurs or not, and if yes, acquiring the change condition of a first difference value between the indoor environment temperature and the average value of the first evaporator coil temperature;
s3: obtaining a second difference between the compressor discharge temperature and the average of the first evaporator coil temperature;
s4: determining whether the first difference belongs to a first temperature interval or a second temperature interval according to the change condition of the first difference, if the first difference belongs to the first temperature interval, executing S5, and if the first difference belongs to the second temperature interval, executing S7;
s5: judging whether the second difference value is smaller than or equal to a first preset temperature difference, if so, executing S6, and if not, executing S8;
s6: judging whether the air conditioner has refrigerant leakage according to the percentage change of the refrigerant quantity flow in the air conditioning system, if so, executing S9, and if not, returning to S1;
s7: judging whether the duration time of the first difference value in a second temperature interval is greater than a second preset time or not, and whether the second difference value is greater than or equal to a third preset temperature difference or not, if so, executing S8, and if not, returning to S1;
s8: according to the average value T of the temperature of the windward side of the second evaporator1ucAnd the second evaporator coil temperature average value T2ucJudging whether the air conditioner has refrigerant leakage or not according to the return air temperature of the condenser, the exhaust temperature of the compressor and the working current of the compressor, if so, executing S9, and if not, executing S1;
s9: calculating the refrigerant leakage amount of the air conditioner according to the actual operating power of an air conditioner compressor and the theoretical operating power of the air conditioner, and determining the operating strength and the operating time of an indoor fan motor according to the refrigerant leakage amount;
s10: and collecting the refrigerant in the outdoor unit and giving an alarm.
2. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S1 includes:
s11: starting the air conditioner, obtaining the temperature of the coil of the evaporator of the air conditioner for multiple times and the average value T of the temperature of the windward side of the first evaporator1Ave；
S12: calculating the average value of the obtained temperatures of the plurality of evaporator coils as the average value T of the temperatures of the first evaporator coil2Ave。
3. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S2 includes:
s21: judgment of T2AveWhether the temperature value of each coil is larger than or equal to a first preset temperature or not and whether the temperature value of each coil is within a preset temperature range or not, if so, S22 is executed, and if not, the step is returnedS1；
S22: and acquiring a first difference value between the indoor environment temperature and the average value of the coil temperature, continuously counting first preset time, and drawing a 'first difference value-time' curve.
4. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S4 includes:
s41: calculating the probability of whether the first difference value is in the first temperature interval or the second temperature interval;
s42: and determining whether the first difference value belongs to the first temperature interval or the second temperature interval according to the floating condition of the first difference value in the 'first difference value-time' curve, and executing S5 if the first difference value belongs to the first temperature interval, and executing S7 if the first difference value belongs to the second temperature interval.
5. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S6 includes:
s61: calculating the percentage change number of the cold medium amount flow in the air conditioning system, and then executing S62;
s62: judging whether the refrigerant mass flow change percentage exceeds a preset percentage, if so, executing S9, and if not, executing S63;
s63: after determining that the air conditioner is not leaking refrigerant, S1 is executed.
6. An air conditioning refrigerant leak detection method as claimed in claim 1, wherein before S8 and after S5, the method further comprises:
s6': and (5) judging whether the detection times in the step (S5) exceed the preset detection times, if so, executing S8, otherwise, returning to S5.
7. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S8 includes:
s81: judging whether the running time of the compressor reaches a third preset time or not, if so, acquiring the second time of the evaporator again every fourth preset timeAverage value T of temperatures of two windward sides1ucAnd the second evaporator coil temperature average value T2ucWhen the running time of the compressor reaches a fifth preset time, acquiring the return air temperature of the condenser, the exhaust temperature of the compressor and the working current of the compressor;
s82: judging whether the return air temperature of the condenser is greater than the second preset temperature and less than or equal to a third preset temperature T1ucAnd T2ucWhether the absolute value of the difference is less than a first preset refrigeration temperature value T2AveAnd T2ucWhether the absolute value of the difference is less than a second preset refrigeration temperature value T1AveAnd T1ucWhether the absolute value of the difference is less than a fourth preset temperature, whether the exhaust temperature of the compressor is greater than a fifth preset temperature and whether the working current of the compressor is less than a first preset current or not, if not, executing S1, and if so, executing S83;
s83: and judging the refrigerant leakage of the air conditioner.
8. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S9 includes:
s91: acquiring actual operating power of an air conditioner compressor and theoretical operating power of an air conditioner;
s92: calculating the refrigerant leakage amount of the air conditioner according to the theoretical operating power corresponding to different leakage amounts of the refrigerant;
s93: and controlling the indoor fan motor to operate in strong wind according to the leakage amount of the refrigerant, and timing the operation time in strong wind.
9. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S10 includes:
s101: controlling a three-way valve at a refrigerant outlet of the compressor to change the conduction direction, and conducting the refrigerant discharged from the compressor into the compressor again;
s102: and after the strong wind runs for the sixth preset time, the air conditioner is stopped and an alarm is given out.
10. An air conditioner characterized by using the air conditioner refrigerant leakage detection method according to any one of claims 1 to 9.
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