CN110895023B - Air conditioner refrigerant leakage detection method and air conditioner - Google Patents

Air conditioner refrigerant leakage detection method and air conditioner Download PDF

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CN110895023B
CN110895023B CN201811063994.6A CN201811063994A CN110895023B CN 110895023 B CN110895023 B CN 110895023B CN 201811063994 A CN201811063994 A CN 201811063994A CN 110895023 B CN110895023 B CN 110895023B
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air conditioner
temperature
current
refrigerant
value
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CN110895023A (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
    • F24F11/61—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)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner refrigerant leakage detection method and an air conditioner, wherein the method comprises the following steps: whether the running state of the system needs to be detected by refrigerant leakage is judged initially: judging whether the running frequency of the compressor is greater than a first set frequency or not; acquiring the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing junction temperature of the air conditioner, and judging whether the air conditioner is failed in refrigeration; judging whether refrigerant leakage occurs according to the detected current refrigerant concentration outside the drain hole; adjusting the rotating speed of an exhaust fan of the air conditioner, and judging whether the concentration of the refrigerant is reduced below a second preset concentration value; tripping the electromagnetic valve, and determining the severity of refrigerant leakage according to the counted tripping times of the electromagnetic valve; the air conditioner is stopped, and the refrigerant is recovered. The invention has the beneficial effects that: (1) the air conditioner has higher judgment accuracy on refrigerant leakage. (2) The leaked refrigerant gas is discharged in time, so that the air conditioner is safer.

Description

Air conditioner refrigerant leakage detection method and air conditioner
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioner refrigerant leakage detection method and an air conditioner.
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 refrigerant leakage detection method of an air conditioning system comprises the following steps:
s1: determining the system operation state according to the air conditioner operation current value, judging whether the system needs to carry out refrigerant leakage detection, if so, executing S2, and if not, executing S1;
s2: detecting the running frequency of a compressor when an indoor fan of the air conditioner runs at the highest wind level, judging whether the running frequency of the compressor is greater than a first set frequency f1, if so, starting a timer to enable the air conditioner to enter a refrigerant leakage judging stage, executing S3, and if not, continuing executing S2;
s3: acquiring the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing junction temperature of the air conditioner, judging whether the air conditioner fails to refrigerate or not according to the current outdoor environment temperature, the absolute value difference of the current outdoor liquid pipe temperature and the absolute value difference of the current indoor unit coil pipe temperature and the indoor temperature, if yes, executing S4, and if not, continuing executing S3;
s4: comparing the detected current refrigerant concentration outside the drain hole with a first preset concentration, judging whether refrigerant leakage occurs, if so, executing S5, otherwise, continuing executing S4;
s5: adjusting the rotating speed of an exhaust fan of the air conditioner, judging whether the concentration of the refrigerant is reduced to be lower than a second preset concentration value, if so, executing S6, otherwise, resetting the first rotating speed value, and then continuing executing S5;
s6: tripping the electromagnetic valve, and determining the severity of refrigerant leakage according to the counted tripping times of the electromagnetic valve;
s7: the air conditioner is stopped, and the refrigerant is recovered.
Preferably, the S1 includes:
s11: obtaining the temperature T of the coil pipe of the indoor unit before the compressor of the frequency conversion air conditioner operatesInternal machine(ii) a Obtaining an outdoor temperature TOuter coverAnd the air conditioner running current value IFortune；
S12: calculating the running current value I of the air conditionerFortuneAnd the air conditioner operation standard current value ISign boardAnd calculating the difference value and the air conditioner operation standard current value ISign boardIf the ratio is smaller than the preset ratio threshold, executing S2 if the ratio is smaller than the preset ratio threshold, and otherwise, continuing executing S12.
Preferably, the S11 includes:
the air conditioner collects the temperature detected by the coil temperature sensor of the indoor unit for many times before starting up, and carries out average value operation on the temperature collected for many times, and the obtained average value of the temperature is taken as the temperature T of the coil pipe of the indoor unit before the compressor operatesInternal machine(ii) a The air conditioner collects the temperature detected by the outdoor temperature sensor for multiple times within the preset detection time after starting up, and carries out average value operation on the temperature collected for multiple times, and the obtained average value of the temperature is taken as the current outdoor temperature TOuter cover。
Preferably, the S2 includes:
s21: controlling an indoor fan of the air conditioner to run at the highest wind level, and detecting the running frequency of a compressor in real time;
s22: counting the running frequency values of the compressor for N times within preset frequency counting time, and calculating the frequency mean value of the running frequency values of the compressor for N times;
s23: judging whether the frequency mean value is greater than a first set frequency f1, if so, executing S24, and if not, returning to S21;
s24: the timer is started to make the air conditioner enter the refrigerant leakage judging stage, and then S3 is executed.
Preferably, the S3 includes:
s31: acquiring the current outdoor environment temperature To, the current outdoor liquid pipe temperature Ti and the current indoor return air temperature T of the air conditionerGo back toAnd the current indoor anti-freezing junction temperature TDefend；
S32: judging whether the difference between the absolute value of the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti and the third temperature threshold value is less than 0 or not, and judging whether the current indoor return air temperature T isGo back toAnd the current indoor freezing prevention temperature TDefendWhether the difference between the absolute value of the difference and the fourth temperature threshold is smaller than 0, and whether the absolute value difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti under the set rotating speed meets the conditions: if the | Ti-To |/| delta T | < B, executing S33, and if not, returning To S31;
s33: acquiring the current coil temperature T1 and the indoor temperature TC1 of the indoor unit;
s34: determining the temperature T of the coil of the indoor unit before the compressor is operatingInternal machineWhether the absolute value of the difference from T1 is less than the first temperature threshold d1, and whether the absolute value of the difference from TC1 and T1 is less than the second temperature threshold d 2; if so, execution proceeds to S4, otherwise, return to S33.
Preferably, the S4 includes:
s41: acquiring the concentration of a refrigerant of a current air conditioner and a first preset concentration stored in a controller;
s42: and judging whether leakage occurs or not according to the current refrigerant concentration and the first preset concentration, if so, executing S5, and if not, returning to S41.
Preferably, the S5 includes:
s51: adjusting the rotating speed of an exhaust fan of the air conditioner to a first rotating speed;
s52: after the exhaust fan rotates for a first preset time, whether the concentration of the refrigerant is reduced to be lower than a second preset concentration value or not is judged, if yes, S6 is executed, if not, the first rotating speed value is reset according to the difference value between the currently detected concentration of the refrigerant and the second preset concentration value, and then S51 is executed.
Preferably, the S6 includes:
s61: tripping the electromagnetic valve, and counting the tripping times by a counter;
s62: judging whether the trip times reach a time threshold value, if so, sending a serious alarm, then executing S63, if not, reclosing the electromagnetic valve, restarting the air conditioner, and returning to S1;
s63: and controlling the compressor to continuously operate at a low frequency while keeping the exhaust fan in operation.
Preferably, the S7 includes:
s71: judging the temperature control mode of the air conditioner, and if the air conditioner is in the heating mode, executing step S72; if the air conditioner is in the cooling mode, executing step S75;
s72: controlling the pressure reduction at the outlet end of the compressor;
s73: judging whether the pressure at the outlet end of the compressor reaches a preset pressure value, if so, executing S74, and if not, executing S72;
s74: switching the air conditioner to a cooling mode for operation, and then executing S75;
s75: and closing an electronic expansion valve used for controlling and adjusting a pipeline between the outdoor heat exchanger and the indoor heat exchanger.
An air conditioner using the refrigerant leakage detection method of the air conditioning system described above.
The invention has the beneficial effects that: (1) the air conditioner has higher judgment accuracy on refrigerant leakage. (2) The leaked refrigerant gas is discharged in time, so that the air conditioner is safer.
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 logic diagram of a refrigerant leakage detection method for an air conditioning system according to the present invention;
FIG. 2 is a logic diagram illustrating the step S1 in FIG. 1;
FIG. 3 is a logic diagram illustrating the step S2 in FIG. 1;
FIG. 4 is a logic diagram illustrating the step S3 in FIG. 1;
FIG. 5 is a logic diagram illustrating the step S4 in FIG. 1;
FIG. 6 is a logic diagram illustrating the step S5 in FIG. 1;
FIG. 7 is a logic diagram illustrating the step S6 in FIG. 1;
fig. 8 is a logic diagram of step S7 in fig. 1.
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.
A refrigerant leakage detection method of an air conditioning system comprises the following steps:
s1: determining the system operation state according to the air conditioner operation current value, judging whether the system needs to carry out refrigerant leakage detection, if so, executing S2, and if not, executing S1;
s2: detecting the running frequency of a compressor when an indoor fan of the air conditioner runs at the highest wind level, judging whether the running frequency of the compressor is greater than a first set frequency f1, if so, starting a timer to enable the air conditioner to enter a refrigerant leakage judging stage, executing S3, and if not, continuing executing S2;
s3: acquiring the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing junction temperature of the air conditioner, judging whether the air conditioner fails to refrigerate or not according to the current outdoor environment temperature, the absolute value difference of the current outdoor liquid pipe temperature and the absolute value difference of the current indoor unit coil pipe temperature and the indoor temperature, if yes, executing S4, and if not, continuing executing S3;
s4: comparing the detected current refrigerant concentration outside the drain hole with a first preset concentration, judging whether refrigerant leakage occurs, if so, executing S5, otherwise, continuing executing S4;
s5: adjusting the rotating speed of an exhaust fan of the air conditioner, judging whether the concentration of the refrigerant is reduced to be lower than a second preset concentration value, if so, executing S6, otherwise, resetting the first rotating speed value, and then continuing executing S5;
s6: tripping the electromagnetic valve, and determining the severity of refrigerant leakage according to the counted tripping times of the electromagnetic valve;
s7: the air conditioner is stopped, and the refrigerant is recovered.
Specifically, the step S1 includes:
s11: obtaining the temperature T of the coil pipe of the indoor unit before the compressor of the frequency conversion air conditioner operatesInternal machine(ii) a Obtaining an outdoor temperature TOuter coverAnd the air conditioner running current value IFortune。
Specifically, the air conditioner collects the temperature detected by the indoor unit coil temperature sensor for multiple times before starting up, and carries out average value operation on the temperature collected for multiple times, and the obtained average value of the temperature is used as the indoor unit coil temperature T before the compressor runsAn internal machine;similarly, the air conditioner collects the temperature detected by the outdoor temperature sensor for multiple times within the preset detection time after the air conditioner is started, and performs average value operation on the temperature collected for multiple times, and the obtained average value of the temperature is used as the current outdoor temperature TOuter cover。
S12: calculating the running current value I of the air conditionerFortuneAnd the air conditioner operation standard current value ISign boardAnd calculating the difference value and the air conditioner operation standard current value ISign boardIf the ratio is smaller than the preset ratio threshold, executing S2 if the ratio is smaller than the preset ratio threshold, and otherwise, continuing executing S12.
Wherein the standard current value ISign boardThe current value of the air conditioner running current corresponding to the current outdoor environment temperature of the air conditioner in the leakage-free condition is recorded in the internal storage space of the controller in the form of a comparison table and is obtained by carrying out actual measurement one by one in a factory test mode, namely the outdoor temperature T measured in the step S1 is required to be measuredOuter coverDetermining the standard current value I by using a look-up comparison tableSign board。
If the difference value and the air conditioner operation standard current value I are judgedSign boardIf the ratio of (a) to (b) is smaller than the preset ratio threshold, it indicates that the air conditioner may have a poor cooling effect, which is largely caused by refrigerant leakage, so step S12 is a starting point for determining whether to perform refrigerant leakage detection.
Specifically, the step S2 includes:
s21: and controlling an indoor fan of the air conditioner to operate at the highest wind level, and detecting the operating frequency of the compressor in real time.
The indoor fan of the air conditioner is enabled to operate at the highest wind level, and indoor air can rapidly circulate in the indoor unit. Under the condition that the system normally works, the indoor fan can quickly reduce the indoor temperature to the set temperature when running at the highest wind gear, and when the indoor temperature is reduced to the set temperature, the running frequency of the compressor should be correspondingly reduced. And step S21 is triggered by step S1 when it is determined that the cooling effect of the air conditioner may be deteriorated, in which case the operation frequency of the air conditioner compressor may not be decreased or may not be decreased to the first set frequency.
S22: and counting the running frequency values of the compressor for N times within the preset frequency counting time, and calculating the frequency mean value of the running frequency values of the compressor for N times.
S23: and judging whether the frequency average value is greater than a first set frequency f1, if so, executing S24, and if not, returning to S21.
If the frequency mean value is greater than a first set frequency f1, the air conditioner needs to be switched to a refrigerant leakage judging stage to detect refrigerant leakage; if the frequency mean value is not greater than the first set frequency f1, it indicates that the air conditioner does not need to shift to the refrigerant leakage determination stage.
S24: the timer is started to make the air conditioner enter the refrigerant leakage judging stage, and then S3 is executed.
The timer is used for setting a continuous period of refrigerant leakage judgment, and if a corresponding conclusion or a corresponding processing result is not obtained about whether the refrigerant is leaked or not in the set period, the controller controls the air conditioner to stop and sends an alarm of refrigerant leakage judgment overtime to a user.
Specifically, the step S3 includes:
s31: acquiring the current outdoor environment temperature To, the current outdoor liquid pipe temperature Ti and the current indoor return air temperature T of the air conditionerGo back toAnd the current indoor anti-freezing junction temperature TDefend。
S32: judging whether the difference between the absolute value of the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti and the third temperature threshold value is less than 0 or not, and judging whether the current indoor return air temperature T isGo back toAnd the current indoor freezing prevention temperature TDefendWhether the difference between the absolute value of the difference and the fourth temperature threshold is less than 0 or not, and the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti at the set rotating speedWhether the absolute value of (a) satisfies the condition: if the value is less than B, executing S33, otherwise, returning To S31.
When the difference between the absolute value of the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti and the third temperature threshold is less than 0, and the current indoor return air temperature TGo back toAnd the current indoor freezing prevention temperature TDefendWhen the difference between the absolute value of the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti and the third temperature threshold is more than or equal To 0, and the current indoor return air temperature TGo back toAnd the current indoor freezing prevention temperature TDefendWhen the difference between the absolute value of the difference and the fourth temperature threshold is more than or equal To 0, judging that the refrigerant in the air conditioner is not leaked, and meanwhile, judging that the system does not work normally if the absolute value of the difference and the fourth temperature threshold is less than B, wherein the absolute value of the difference is the difference between the return air temperature and the supply air temperature corresponding To the current outdoor environment temperature of the air conditioner in a leakage-free condition and at a set rotating speed; b is a first set value and 1>B>0。
S33: and acquiring the current coil temperature T1 and the indoor temperature TC1 of the indoor unit.
S34: determining the temperature T of the coil of the indoor unit before the compressor is operatingInternal machineWhether the absolute value of the difference from T1 is less than the first temperature threshold d1, and whether the absolute value of the difference from TC1 and T1 is less than the second temperature threshold d 2; if so, execution proceeds to S4, otherwise, return to S33.
If the temperature T of the coil pipe of the indoor unit before operation is judgedInternal machineIf the absolute value of the difference between the absolute value of the difference and the T1 is smaller than the first temperature threshold d1, it indicates that the temperature of the coil pipe of the indoor unit is limited after the air conditioner is started, which may be the case that the temperature of the coil pipe of the indoor unit is not obviously reduced due to the large specific heat capacity of water under the conditions of high temperature and high humidity, and cannot necessarily indicate that the temperature reduction is limited due to the system fault, therefore, it is also necessary to detect whether the absolute value of the difference between TC1 and T1 is smaller than the second temperature threshold d2, and if so, it indicates that the temperature reduction of the room temperature is not obvious, it indicates that the temperature reduction of the room temperature.
Specifically, the step S4 includes:
s41: the method comprises the steps of obtaining the concentration of a refrigerant of the current air conditioner and a first preset concentration stored in a controller.
In the embodiment, a refrigerant concentration sensor is arranged on the air conditioner, and the refrigerant concentration sensor can detect the current refrigerant concentration of the air conditioner, wherein the refrigerant concentration is the current concentration value of the refrigerant on the outdoor side of the air conditioner; the first preset concentration is a first alarm line value of the preset stored refrigerant concentration, and if the first preset concentration is 10% of LFL, LFL is a lower limit value of combustion of the refrigerant used by the air conditioner.
The method of the present embodiment may be applied to a window type air conditioner including an integrated chassis and a refrigeration system, indoor and outdoor side fan systems, and structural members fixing the refrigeration system and the fan systems mounted on the integrated chassis. The refrigerant concentration sensor is arranged near the outlet of the outdoor side of the drain hole of the window type air conditioner. The device can detect the concentration of the refrigerant of the window type air conditioner, and the exhaust fan can exhaust the refrigerant when the concentration of the refrigerant of the window type air conditioner is overhigh.
S42: and judging whether leakage occurs or not according to the current refrigerant concentration and the first preset concentration, if so, executing S5, and if not, returning to S41.
Specifically, the step S5 includes:
s51: and adjusting the rotating speed of an air exhaust fan of the air conditioner to a first rotating speed.
S52: after the exhaust fan rotates for a first preset time, whether the concentration of the refrigerant is reduced to be lower than a second preset concentration value or not is judged, if yes, S6 is executed, if not, the first rotating speed value is reset according to the difference value between the currently detected concentration of the refrigerant and the second preset concentration value, and then S51 is executed.
When the air conditioner enters a working state, the concentration value of the refrigerant at the outdoor side of the air conditioner can be detected through a refrigerant concentration sensor, namely the concentration value of the refrigerant of the air conditioner is detected; meanwhile, a first preset concentration corresponding to the air conditioner is obtained, and when the current refrigerant concentration of the air conditioner and the first preset concentration are obtained, the current refrigerant concentration of the air conditioner is compared and judged with the first preset concentration; when the concentration of the refrigerant of the air conditioner is smaller than the first preset concentration, judging that the refrigerant does not leak, and detecting the concentration of the refrigerant of the air conditioner in real time through a refrigerant concentration sensor; the first preset time is preset and stored running time corresponding to a first rotating speed of an exhaust fan of the air conditioner, and the first rotating speed is preset and stored rotating speed corresponding to the condition that the concentration of the refrigerant of the air conditioner at present is greater than the first preset concentration; when the first preset time and the first rotating speed are obtained, the air exhaust fan of the air conditioner operates according to the first rotating speed within the first preset time, and exhausts air to the drain hole; when the exhaust fan operates according to the first rotation speed within the first preset time, continuously detecting the concentration of the refrigerant of the current air conditioner, and obtaining a second preset concentration of the air conditioner, where the second preset concentration is a second warning line value of the preset stored concentration of the refrigerant, for example, the second preset concentration is 25% LFL, and LFL is a lower limit value of combustion of the refrigerant used by the air conditioner;
when the second preset concentration is obtained, judging the concentration of the refrigerant of the air conditioner and the second preset concentration, and if the concentration of the refrigerant of the air conditioner is higher than the second preset concentration, resetting the first rotating speed value; when the operation of the air exhaust fan of the air conditioner is finished according to the first preset time within the first preset time, the operation is continued according to the reset first rotating speed value; when the current rotating speed of the exhaust fan reaches a reset first rotating speed value, detecting the current refrigerant concentration of the air conditioner in real time, and comparing the current refrigerant concentration of the air conditioner with the second preset concentration again;
if the current refrigerant concentration of the air conditioner and the second preset concentration are judged when the second preset concentration is obtained, and the current refrigerant concentration of the air conditioner is smaller than the second preset concentration, determining the current refrigerant concentration of the air conditioner and the first preset concentration; when the concentration of the refrigerant of the air conditioner is smaller than the second preset concentration and larger than the first preset concentration, acquiring a third rotating speed corresponding to an exhaust fan of the air conditioner; the third rotating speed is the corresponding rotating speed of the preset and stored exhaust fan when the concentration of the refrigerant of the current air conditioner is smaller than the second preset concentration and larger than the first preset concentration; when the exhaust fan runs at the first rotating speed within the first preset time, the exhaust fan runs at the third rotating speed; continuously increasing the third rotating speed of the exhaust fan at a preset value-added frequency; when the current rotating speed of the exhaust fan reaches a preset rotating speed threshold value, detecting the current refrigerant concentration of the air conditioner in real time, and comparing the current refrigerant concentration of the air conditioner with the first preset concentration; if the concentration of the refrigerant of the air conditioner is smaller than the first preset concentration, the rotating speed of the air exhaust fan is reduced; if the concentration of the refrigerant of the air conditioner is still greater than the first preset concentration, the exhaust fan keeps the preset rotating speed threshold value to operate in a second preset time, and then the air conditioner is determined to generate refrigerant leakage; if the second preset concentration is obtained, judging the concentration of the refrigerant of the air conditioner and the second preset concentration to obtain that the concentration of the refrigerant of the air conditioner is smaller than the second preset concentration, and determining that the concentration of the refrigerant of the air conditioner is smaller than the first preset concentration; and when the exhaust fan runs at the first rotation speed within the first preset time, closing the exhaust fan and determining that the current air conditioner does not generate refrigerant leakage.
Specifically, the step S6 includes:
s61: and (5) tripping the electromagnetic valve, and counting the tripping times by using a counter.
In the invention, the electromagnetic relay is connected with a temporary tripping function, and the counter can record the tripping times of the electromagnetic relay. And if the leakage is judged to occur according to the current refrigerant concentration and the first preset concentration, tripping the electromagnetic valve to enable the system of the air conditioner to temporarily stop working, but still keeping the air exhaust fan working.
S62: and judging whether the trip times reach a time threshold value, if so, giving a serious alarm, then executing S63, otherwise, reclosing the electromagnetic valve, restarting the air conditioner, and returning to S1.
S63: and controlling the compressor to continuously operate at a low frequency while keeping the exhaust fan in operation.
The air condition compressor carries out low frequency and lasts the operation, can guarantee that the intensity that the control refrigerant leaked is weakest, keeps the fan operation of airing exhaust, can make the refrigerant that leaks disperse to the external world as far as possible, avoids leaking the refrigerant and assembles and cause the explosion.
Specifically, the step S7 includes:
s71: judging the temperature control mode of the air conditioner, and if the air conditioner is in the heating mode, executing step S72; if the air conditioner is in the cooling mode, step S75 is executed.
S72: controlling the pressure reduction at the outlet end of the compressor.
S73: and judging whether the pressure at the outlet end of the compressor reaches a preset pressure value, if so, executing S74, and if not, executing S72.
S74: the air conditioner is switched to the cooling mode operation and then S75 is performed.
S75: and closing an electronic expansion valve used for controlling and adjusting a pipeline between the outdoor heat exchanger and the indoor heat exchanger.
When the pressure at the inlet end of the compressor is reduced to a preset pressure value, the compressor is controlled to stop running, and meanwhile, an electromagnetic valve used for controlling the opening/closing of a pipeline between the inlet end of the compressor and the indoor heat exchanger is closed, so that the refrigerant is recovered as much as possible. When the air conditioner is in a refrigeration mode and operates and receives a shutdown signal, the fan of the indoor unit is shut down at the last moment, so that heat exchange is still carried out between the refrigerant in the indoor unit and the indoor heat exchanger in the process of pumping the refrigerant in the indoor side of the air conditioner out of the outdoor side of the air conditioner, the indoor unit can still cool the indoor space, and the air conditioner is more fully and reasonably utilized.
The invention also provides an air conditioner using the refrigerant leakage detection method of the air conditioning system.
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: determining the system operation state according to the air conditioner operation current value, judging whether the system needs to carry out refrigerant leakage detection, if so, executing S2, and if not, executing S1;
s2: detecting the running frequency of a compressor when an indoor fan of the air conditioner runs at the highest wind level, judging whether the running frequency of the compressor is greater than a first set frequency f1, if so, starting a timer to enable the air conditioner to enter a refrigerant leakage judging stage, executing S3, and if not, continuing executing S2;
s3: acquiring the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing junction temperature of the air conditioner, judging whether the air conditioner fails to refrigerate or not according to the absolute value of the current outdoor environment temperature, the current outdoor liquid pipe temperature difference and the absolute value of the current indoor unit coil pipe temperature and the current indoor temperature difference, if yes, executing S4, and if not, continuing executing S3;
s4: comparing the detected current refrigerant concentration outside the drain hole with a first preset concentration, judging whether refrigerant leakage occurs, if so, executing S5, otherwise, continuing executing S4;
s5: adjusting the rotating speed of an exhaust fan of the air conditioner, judging whether the concentration of the refrigerant is reduced to be lower than a second preset concentration value, if so, executing S6, otherwise, resetting the first rotating speed value of the exhaust fan, and then continuing executing S5;
s6: tripping the electromagnetic valve, and determining the severity of refrigerant leakage according to the counted tripping times of the electromagnetic valve;
s7: the air conditioner is stopped, and the refrigerant is recovered.
2. The refrigerant leakage detection method according to claim 1, wherein the S1 includes:
s11: obtaining the temperature T of the coil pipe of the indoor unit before the compressor of the frequency conversion air conditioner operatesInternal machine(ii) a Obtaining an outdoor temperature TOuter coverAnd the air conditioner running current value IFortune；
S12: calculating the running current value I of the air conditionerFortuneAnd the air conditioner operation standard current value ISign boardAnd calculating the difference value and the air conditioner operation standard current value ISign boardIf the ratio is smaller than the preset ratio threshold, executing S2 if the ratio is smaller than the preset ratio threshold, and otherwise, continuing executing S12.
3. The refrigerant leakage detection method according to claim 2, wherein the S11 includes:
the air conditioner collects the temperature detected by the coil temperature sensor of the indoor unit for many times before starting up, and carries out average value operation on the temperature collected for many times, and the obtained average value of the temperature is taken as the temperature T of the coil pipe of the indoor unit before the compressor operatesInternal machine(ii) a The air conditioner collects the temperature detected by the outdoor temperature sensor for multiple times within the preset detection time after starting up, and carries out average value operation on the temperature collected for multiple times, and the obtained average value of the temperature is taken as the current outdoor temperature TOuter cover。
4. The refrigerant leakage detection method according to claim 1, wherein the S2 includes:
s21: controlling an indoor fan of the air conditioner to run at the highest wind level, and detecting the running frequency of a compressor in real time;
s22: counting the running frequency values of the compressor for N times within preset frequency counting time, and calculating the frequency mean value of the running frequency values of the compressor for N times;
s23: judging whether the frequency mean value is greater than a first set frequency f1, if so, executing S24, and if not, returning to S21;
s24: the timer is started to make the air conditioner enter the refrigerant leakage judging stage, and then S3 is executed.
5. The refrigerant leakage detection method according to claim 1, wherein the S3 includes:
s31: acquiring the current outdoor environment temperature To, the current outdoor liquid pipe temperature Ti and the current indoor return air temperature T of the air conditionerGo back toAnd the current indoor anti-freezing junction temperature TDefend；
S32: judging whether the difference between the absolute value of the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti and the third temperature threshold value is less than 0 or not, and judging whether the current indoor return air temperature T isGo back toAnd the current indoor freezing prevention temperature TDefendWhether the difference between the absolute value of the difference and the fourth temperature threshold is smaller than 0, and whether the absolute values of the difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti under the set rotating speed meet the conditions: if the | Ti-To |/| delta T | < B, executing S33, and if not, returning To S31;
s33: acquiring the current coil temperature T1 and the indoor temperature TC1 of the indoor unit;
s34: determining the temperature T of the coil of the indoor unit before the compressor is operatingInternal machineWhether the absolute value of the difference from T1 is less than the first temperature threshold d1, and whether the absolute value of the difference from TC1 and T1 is less than the second temperature threshold d 2; if so, execution proceeds to S4, otherwise, return to S33.
6. The refrigerant leakage detection method according to claim 1, wherein the S4 includes:
s41: acquiring the concentration of a refrigerant of a current air conditioner and a first preset concentration stored in a controller;
s42: and judging whether leakage occurs or not according to the current refrigerant concentration and the first preset concentration, if so, executing S5, and if not, returning to S41.
7. The refrigerant leakage detection method according to claim 1, wherein the S5 includes:
s51: adjusting the rotating speed of an exhaust fan of the air conditioner to a first rotating speed;
s52: after the exhaust fan rotates for a first preset time, whether the concentration of the refrigerant is reduced to be lower than a second preset concentration value or not is judged, if yes, S6 is executed, if not, the first rotating speed value is reset according to the difference value between the currently detected concentration of the refrigerant and the second preset concentration value, and then S51 is executed.
8. The refrigerant leakage detection method according to claim 1, wherein the S6 includes:
s61: tripping the electromagnetic valve, and counting the tripping times by a counter;
s62: judging whether the trip times reach a time threshold value, if so, sending a serious alarm, then executing S63, if not, reclosing the electromagnetic valve, restarting the air conditioner, and returning to S1;
s63: and controlling the compressor to continuously operate at a low frequency while keeping the exhaust fan in operation.
9. The refrigerant leakage detection method according to claim 1, wherein the S7 includes:
s71: judging the temperature control mode of the air conditioner, and if the air conditioner is in the heating mode, executing step S72; if the air conditioner is in the cooling mode, executing step S75;
s72: controlling the pressure reduction at the outlet end of the compressor;
s73: judging whether the pressure at the outlet end of the compressor reaches a preset pressure value, if so, executing S74, and if not, executing S72;
s74: switching the air conditioner to a cooling mode for operation, and then executing S75;
s75: and closing an electronic expansion valve used for controlling and adjusting a pipeline between the outdoor heat exchanger and the indoor heat exchanger.
10. An air conditioner characterized by using the method for detecting refrigerant leakage of an air conditioning system according to any one of claims 1 to 9.
CN201811063994.6A 2018-09-12 2018-09-12 Air conditioner refrigerant leakage detection method and air conditioner Active CN110895023B (en)

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