CN110940051A - 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 PDFInfo
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- CN110940051A CN110940051A CN201811115441.0A CN201811115441A CN110940051A CN 110940051 A CN110940051 A CN 110940051A CN 201811115441 A CN201811115441 A CN 201811115441A CN 110940051 A CN110940051 A CN 110940051A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The invention discloses an air conditioner refrigerant leakage detection method, which comprises the following steps: judging whether the air conditioner enters a self-checking stage or not; judging whether the refrigerant concentration sensor works normally or not; comparing the detected current refrigerant concentration outside the drain hole with a first preset concentration, and judging whether refrigerant leakage occurs or not; correcting the concentration percentage of each molecular component in the refrigerant, which is obtained from the evaporator end and the condenser end, in the total molecular component according to the temperature variance of the evaporator and the condenser; judging whether refrigerant leakage occurs according to the concentration percentage of each molecular component in the corrected refrigerant in the total molecular component; and after the refrigerant system is repaired, starting the air conditioner again, and judging whether the refrigerant system works normally or not according to the percentage change of the refrigerant medium flow in the air conditioner system. The invention has the beneficial effects that: the air conditioner has higher judgment accuracy on refrigerant leakage.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner refrigerant leakage detection method and an air conditioner 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: judging whether the air conditioner enters a self-checking stage or not according to the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing temperature of the air conditioner, if so, executing S2, and if not, continuing executing S1;
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 S2, and if not, continuing executing S1;
s2: judging whether the refrigerant concentration sensor works normally according to a plurality of refrigerant concentrations outside the drain hole chamber detected for a plurality of times, if so, executing S3, otherwise, stopping the operation of the compressor, replacing the refrigerant concentration sensor, and continuing executing S2;
s3: comparing the detected current refrigerant concentration outside the drain hole with a first preset concentration, judging whether refrigerant leakage occurs, if so, executing S4, otherwise, continuing executing S3;
s4: determining the maximum pipeline temperature of the evaporator, the minimum pipeline temperature of the condenser and the real-time temperatures of the evaporator and the condenser;
s5: calculating the variance of the temperature difference between the real-time temperatures of the evaporator and the condenser and the temperature difference between the maximum pipeline temperature of the evaporator and the minimum pipeline temperature of the condenser respectively;
s6: detecting the concentration percentage of each molecular component in the refrigerant obtained from the evaporator end and the condenser end in the total molecular component;
s7: correcting the concentration percentage of each molecular component in the refrigerant, which is obtained from the evaporator end and the condenser end, in the total molecular component according to the temperature variance of the evaporator and the condenser;
s8: judging whether refrigerant leakage occurs according to the concentration percentage of each molecular component in the corrected refrigerant to the total molecular component, if so, executing S9, and if not, returning to execute S4;
s9: after the refrigerant system is repaired, starting the air conditioner again, and judging whether the refrigerant system works normally or not according to the percentage change of the flow of the refrigerant medium in the air conditioner system;
preferably, the S1 includes:
s11: 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；
S12: judging whether the difference between the absolute 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 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 difference and the fourth temperature threshold is less than 0, and whether the absolute 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 value is less than B, executing S13, and if the value is not greater than B, returning To S11;
s13: acquiring the current coil temperature T1 and the indoor temperature TC1 of the indoor unit;
s14: 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 S2, otherwise, return to S13.
Preferably, the S2 includes:
judging whether the variance values of the obtained multiple refrigerant concentrations are all smaller than a preset variance threshold value, if so, entering S3, and executing a leakage judging stage; if not, the sensor is considered to be abnormal, and the compressor is stopped until the sensor is replaced.
Preferably, the S3 includes:
s31: acquiring the current refrigerant concentration outside the drain hole and a first preset concentration stored in the controller;
s32: and judging whether the refrigerant concentration is greater than the first preset concentration, if so, executing S4, and if not, returning to S31.
Preferably, the S4 includes:
s41: acquiring the maximum pipeline temperature of an evaporator and the minimum pipeline temperature of a condenser within a first preset time period;
s42: and continuously acquiring n real-time pipeline temperatures of the evaporator and n real-time pipeline temperatures of the condenser within a first preset time.
Preferably, the S5 includes:
s51: calculating the absolute value of the difference between the maximum pipeline temperature of the evaporator and each real-time pipeline temperature of the evaporator to obtain n temperature differences of the evaporator, and calculating the variance of the n temperature differences of the evaporator;
s52: calculating the absolute value of the difference between the minimum pipeline temperature of the condenser and each real-time pipeline temperature of the condenser to obtain n temperature differences of the condenser; and calculating the variance of the n temperature differences of the condenser.
Preferably, the S6 includes:
s61: monitoring whether a first infrared sensor at the evaporator end and a second infrared sensor at the condenser end simultaneously receive wavelength data of each molecular component contained in the refrigerant or not in real time, if yes, executing S62, and if not, continuing executing S61;
s62: and acquiring the concentration percentage of each molecular component in the total molecular component according to the received wavelength data of each molecular component.
Preferably, the S7 includes:
s71: according to the variance of the n temperature differences of the evaporator and the variance of the n temperature differences of the condenser, performing stability correction on the concentration percentage of each molecular component in the total molecular component measured at the evaporator end and the condenser end;
s72: and judging whether the concentration percentages corresponding to the modified molecular components are all within the preset molecular concentration percentage range, if so, executing S8, otherwise, returning to S6.
Preferably, the S8 includes:
s81: calculating the percentage change number of the cold medium amount flow in the air conditioning system, and then executing S82;
s82: judging whether the refrigerant mass flow change percentage exceeds a preset percentage, if so, executing S9, and if not, executing S83;
s83: after determining that the air conditioner is not leaking refrigerant, S1 is executed.
An air conditioner using any of the air conditioner refrigerant leakage detection methods described above.
The invention has the beneficial effects that: the air conditioner has higher judgment accuracy on refrigerant leakage.
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 method for detecting refrigerant leakage of an air conditioner 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 S3 in FIG. 1;
FIG. 4 is a logic diagram illustrating the step S4 in FIG. 1;
FIG. 5 is a logic diagram illustrating the step S5 in FIG. 1;
FIG. 6 is a logic diagram illustrating the step S6 in FIG. 1;
FIG. 7 is a logic diagram illustrating the step S7 in FIG. 1;
fig. 8 is a logic diagram of step S8 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.
As shown in fig. 1, the present invention provides a method for detecting refrigerant leakage of an air conditioner, the method comprising the steps of:
s1: and judging whether the air conditioner enters a self-checking stage or not according to the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing temperature of the air conditioner, if so, executing S2, and if not, continuing executing S1.
The method comprises the steps of obtaining 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 is in refrigeration failure 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, executing S2 if yes, and continuing executing S1 if no.
S2: and judging whether the refrigerant concentration sensor works normally according to a plurality of refrigerant concentrations outside the drain hole chamber detected for a plurality of times, if so, executing S3, otherwise, stopping the operation of the compressor, replacing the refrigerant concentration sensor and continuing executing S2.
S3: and comparing the detected current refrigerant concentration outside the drainage hole with a first preset concentration, judging whether refrigerant leakage occurs, if so, executing S4, and if not, continuing executing S3.
S4: determining the maximum pipeline temperature of the evaporator, the minimum pipeline temperature of the condenser and the real-time temperatures of the evaporator and the condenser;
s5: calculating the variance of the temperature difference between the real-time temperatures of the evaporator and the condenser and the temperature difference between the maximum pipeline temperature of the evaporator and the minimum pipeline temperature of the condenser respectively;
s6: detecting the concentration percentage of each molecular component in the refrigerant obtained from the evaporator end and the condenser end in the total molecular component;
s7: correcting the concentration percentage of each molecular component in the refrigerant, which is obtained from the evaporator end and the condenser end, in the total molecular component according to the temperature variance of the evaporator and the condenser;
s8: and judging whether refrigerant leakage occurs according to the concentration percentage of each molecular component in the corrected refrigerant to the total molecular component, if so, executing S9, otherwise, returning to execute S4.
S9: and after the refrigerant system is repaired, starting the air conditioner again, and judging whether the refrigerant system works normally or not according to the percentage change of the refrigerant medium flow in the air conditioner system.
Specifically, as shown in fig. 2, the S1 includes:
s11: 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。
S12: judging whether the difference between the absolute 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 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 difference and the fourth temperature threshold is less than 0, and whether the absolute 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 value is less than B, executing S13, and if the value is not less than B, returning To S11.
When the difference between the absolute 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 difference between the current outdoor environment temperature To and the current outdoor liquid pipe temperature Ti and the difference between the third temperature threshold are more than or equal To 0, and the current indoor return air temperature TGo back toAnd current indoor freezing preventionTemperature TDefendWhen the difference between the absolute 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 difference is less than the absolute value of Ti-To/| delta T | < B, wherein the delta T is the difference between the return air temperature and the supply air temperature corresponding To the current outdoor environment temperature when the air conditioner is in a leakage-free condition and at a set rotating speed; b is a first set value and 1>B>0。
S13: and acquiring the current coil temperature T1 and the indoor temperature TC1 of the indoor unit.
S14: 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 S2, otherwise, return to S13.
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 S2 includes:
judging whether the variance values of the obtained multiple refrigerant concentrations are all smaller than a preset variance threshold value, if so, entering S3, and executing a leakage judging stage; if not, the sensor is considered to be abnormal, and the compressor is stopped until the sensor is replaced.
The refrigerant concentration sensor usually works in a humid and high-temperature environment, and is easy to corrode and damage after being used for a long time, generally, the damage condition is represented by that the readings of the refrigerant concentration sensor jump in a large range in a short time, if the variance values of the refrigerant concentration are all smaller than a preset variance threshold value, the readings of the refrigerant concentration sensor for detecting the variance values of the refrigerant concentration do not jump in a large range in a measuring period, the current work of the refrigerant concentration sensor is normal, and leakage judgment can be carried out according to concentration data obtained from the refrigerant concentration sensor.
If the variance value of the refrigerant concentration is smaller than the preset variance threshold value, it is indicated that the refrigerant concentration sensor has a fault and needs to be maintained or replaced. Specifically, at this time, the air conditioner controller controls the compressor to stop until the faulty refrigerant concentration sensor is replaced, and the compressor is started to operate. The air conditioning controller repeatedly determines whether or not an abnormality removing operation (replacement of the faulty refrigerant concentration sensor) has been performed on itself. When the abnormality removing operation is judged to be performed on the controller, the operation of the compressor is controlled again.
Specifically, as shown in fig. 3, the S3 includes:
s31: the current refrigerant concentration outside the drain hole and the first preset concentration stored in the controller are obtained.
In this embodiment, a refrigerant concentration sensor is disposed on the air conditioner, and the refrigerant concentration sensor can detect the current refrigerant concentration of the air conditioner, where the refrigerant concentration is the current concentration value of the refrigerant outside the air conditioner; the first preset concentration is a first warning line value of a preset stored refrigerant concentration, and if the first preset concentration can be 10% LFL, LFL is a combustion lower limit value 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 too high.
S32: and judging whether the refrigerant concentration is greater than the first preset concentration, if so, executing S4, and if not, returning to S31.
Specifically, as shown in fig. 4, the S4 includes:
s41: the maximum pipeline temperature of the evaporator and the minimum pipeline temperature of the condenser are obtained within a first preset time length.
S42: and continuously acquiring n real-time pipeline temperatures of the evaporator and n real-time pipeline temperatures of the condenser within a first preset time.
Specifically, as shown in fig. 5, the S5 includes:
s51: and calculating the absolute value of the difference between the maximum pipeline temperature of the evaporator and each real-time pipeline temperature of the evaporator to obtain n temperature differences of the evaporator, and calculating the variance of the n temperature differences of the evaporator.
S52: calculating the absolute value of the difference between the minimum pipeline temperature of the condenser and each real-time pipeline temperature of the condenser to obtain n temperature differences of the condenser; and calculating the variance of the n temperature differences of the condenser.
In this embodiment, to avoid the refrigerant leakage of the air conditioner causing the air conditioner to fail to work normally or bring about a potential safety hazard, the condition of the refrigerant is detected when the air conditioner is running. The refrigerant detection mode may be entered when the air conditioner starts to operate, or the refrigerant detection mode may be entered at regular time during the operation of the air conditioner, or the refrigerant detection mode may be entered when the operation environment of the air conditioner (for example, the temperature of the pipeline is monitored) reaches a predetermined condition. When the air conditioner operates in a refrigeration mode, the evaporator is an indoor heat exchanger, and the condenser is an outdoor heat exchanger; when the air conditioner operates in the heating mode, the evaporator is an outdoor heat exchanger, and the condenser is an indoor heat exchanger. Within a few minutes after the air conditioner starts to operate, the temperature of the pipeline of the evaporator can be rapidly reduced and gradually tends to be stable, and the temperature of the pipeline of the condenser can be rapidly increased and gradually tends to be stable. Therefore, in the initial stage of the detection, the pipe temperatures of the evaporator and the condenser are firstly collected within a first preset time period, and the maximum pipe temperature of the evaporator and the minimum pipe temperature of the condenser can be obtained from the collected pipe temperatures. The first preset time can be preset to be 1-2 minutes.
Under the condition that the refrigerant does not leak, a relatively obvious temperature change exists between the maximum pipeline temperature of the evaporator and each real-time pipeline temperature of the evaporator, and between the minimum pipeline temperature of the condenser and each real-time pipeline temperature of the condenser, and when the refrigerant leaks, the temperature change is not obvious or even does not change. Therefore, whether the refrigerant is in danger of leakage can be judged according to the temperature change of the pipelines of the evaporator and the condenser. In order to reduce the misjudgment, n temperature differences of the evaporator are required to be smaller than a preset evaporator temperature difference threshold value, n temperature differences of the condenser are smaller than a preset condenser temperature difference threshold value, and the refrigerant leakage is judged at the moment.
In the invention, the variance of the n temperature differences of the evaporator and the variance of the n temperature differences of the condenser are also calculated respectively and are used for representing the leakage dispersion degrees of the evaporator and the condenser respectively.
Specifically, as shown in fig. 6, the S6 includes:
s61: and monitoring whether the first infrared sensor at the evaporator end and the second infrared sensor at the condenser end simultaneously receive wavelength data of each molecular component contained in the refrigerant or not in real time, if so, executing S62, and if not, continuing executing S61.
S62: and acquiring the concentration percentage of each molecular component in the total molecular component according to the received wavelength data of each molecular component.
The method comprises the following steps that a first infrared sensor at the evaporator end and a second infrared sensor at the condenser end monitor whether wavelength data of each molecular component contained in a refrigerant pipe exist in real time; if the wavelength data of each molecular component is received at the same time, acquiring the concentration percentage of each molecular component in the total molecular component according to the received wavelength data of each molecular component; judging whether the concentration percentages corresponding to the obtained molecular components are all between the preset molecular concentration percentage ranges of the system; if yes, the danger of refrigerant leakage is confirmed.
In this embodiment, the monitored molecular components are: difluoroethane molecules, isobutane molecules, butane molecules.
Specifically, as shown in fig. 7, the S7 includes:
s71: and according to the variance of the n temperature differences of the evaporator and the variance of the n temperature differences of the condenser, performing stability correction on the concentration percentage of each molecular component in the total molecular component measured at the evaporator end and the condenser end.
The concentration percentages of the molecular components in the total molecular components measured at the evaporator end and the condenser end are corrected in stability by using the variance of n temperature differences of the evaporator and the variance of n temperature differences of the condenser, so that the finally obtained concentration percentages of the molecular components in the total molecular components can truly reflect the integral molecular component percentage trend. Specifically, assuming that the variance value of n temperature differences of the evaporator is represented by s1, the variance value of n temperature differences of the condenser is represented by s2, the original concentration ratio of a certain component measured at the evaporator end is p1, and the original concentration ratio of the same component measured at the condenser end is p2, the concentration ratio p of the component can be corrected to be: p-p 1 s1/(s1+ s2) + p2 s2/(s1+ s 2).
S72: and judging whether the concentration percentages corresponding to the modified molecular components are all within the preset molecular concentration percentage range, if so, executing S8, otherwise, returning to S6.
The preset molecular concentration percentage ranges are multiple, a unique group of molecular concentration percentages is set corresponding to each molecular component, the preset molecular concentration percentages can be set automatically according to requirements, in the embodiment, the number of the preset molecular concentration percentage ranges set corresponding to each molecular component is 3, and the unique group of the preset molecular concentration percentage ranges are set corresponding to difluoroethane molecules, isobutane molecules and butane molecules respectively.
In a specific example of the present invention, specific values of a preset molecular concentration percentage range are set according to concentration percentages of the three molecular components contained in the refrigerant; correspondingly, the concentration percentage range of the preset molecules corresponding to difluoroethane molecules is 65-85%, the concentration percentage range of the preset molecules corresponding to isobutane molecules is 11-29%, and the concentration percentage range of the preset molecules corresponding to butane molecules is 1-9%.
Further, after 3 molecular components are received simultaneously, the concentration percentage of each molecular component in the total molecular component is obtained according to the received wavelength data, the result of the concentration percentage is compared with the preset molecular concentration percentage range, and when the concentration percentage corresponding to each molecular component is between the preset molecular concentration percentage ranges of the system, the danger of refrigerant leakage is confirmed.
Specifically, as shown in fig. 8, the S8 includes:
s81: the percentage change of the cold medium amount flow in the air conditioning system is calculated and then S82 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.
S82: and judging whether the refrigerant mass flow change percentage exceeds a preset percentage, if so, executing S9, and if not, executing S83.
S83: after determining that the air conditioner is not leaking refrigerant, S1 is executed.
The refrigerant leakage prevention work of the air conditioner is a key problem in design, manufacture and construction of the whole air conditioner, a certain detection method is generally made to detect refrigerant leakage, and besides, a pipe valve which is not easy to leak and has stronger sealing performance is designed in the aspects of pipe valve design and the like. After the air conditioner is repaired, besides the judgment of the refrigerant leakage, the air conditioner needs to judge whether the refrigerant system leaks or not from the essence of the air conditioner, namely the change percentage of the refrigerant mass flow, so that the air conditioner can work normally.
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: judging whether the air conditioner enters a self-checking stage or not according to the current outdoor environment temperature, the current outdoor liquid pipe temperature, the current indoor return air temperature and the current indoor anti-freezing temperature of the air conditioner, if so, executing S2, and if not, continuing executing S1;
s2: judging whether the refrigerant concentration sensor works normally according to a plurality of refrigerant concentrations outside the drain hole chamber detected for a plurality of times, if so, executing S3, otherwise, stopping the operation of the compressor, replacing the refrigerant concentration sensor, and continuing executing S2;
s3: comparing the detected current refrigerant concentration outside the drain hole with a first preset concentration, judging whether refrigerant leakage occurs, if so, executing S4, otherwise, continuing executing S3;
s4: determining the maximum pipeline temperature of the evaporator, the minimum pipeline temperature of the condenser and the real-time temperatures of the evaporator and the condenser;
s5: calculating the variance of the temperature difference between the real-time temperatures of the evaporator and the condenser and the temperature difference between the maximum pipeline temperature of the evaporator and the minimum pipeline temperature of the condenser respectively;
s6: detecting the concentration percentage of each molecular component in the refrigerant obtained from the evaporator end and the condenser end in the total molecular component;
s7: correcting the concentration percentage of each molecular component in the refrigerant, which is obtained from the evaporator end and the condenser end, in the total molecular component according to the temperature variance of the evaporator and the condenser;
s8: judging whether refrigerant leakage occurs according to the concentration percentage of each molecular component in the corrected refrigerant to the total molecular component, if so, executing S9, and if not, returning to execute S4;
s9: and after the refrigerant system is repaired, starting the air conditioner again, and judging whether the refrigerant system works normally or not according to the percentage change of the refrigerant medium flow in the air conditioner system.
2. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S1 includes:
s11: 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；
S12: judging whether the difference between the absolute 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 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 difference and the fourth temperature threshold is less than 0, and whether the absolute 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 value is less than B, executing S13, and if the value is not greater than B, returning To S11;
s13: acquiring the current coil temperature T1 and the indoor temperature TC1 of the indoor unit;
s14: 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 S2, otherwise, return to S13.
3. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S2 includes:
judging whether the variance values of the obtained multiple refrigerant concentrations are all smaller than a preset variance threshold value, if so, entering S3, and executing a leakage judging stage; if not, the sensor is considered to be abnormal, and the compressor is stopped until the sensor is replaced.
4. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S3 includes:
s31: acquiring the current refrigerant concentration outside the drain hole and a first preset concentration stored in the controller;
s32: and judging whether the refrigerant concentration is greater than the first preset concentration, if so, executing S4, and if not, returning to S31.
5. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S4 includes:
s41: acquiring the maximum pipeline temperature of an evaporator and the minimum pipeline temperature of a condenser within a first preset time period;
s42: and continuously acquiring n real-time pipeline temperatures of the evaporator and n real-time pipeline temperatures of the condenser within a first preset time.
6. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S5 includes:
s51: calculating the absolute value of the difference between the maximum pipeline temperature of the evaporator and each real-time pipeline temperature of the evaporator to obtain n temperature differences of the evaporator, and calculating the variance of the n temperature differences of the evaporator;
s52: calculating the absolute value of the difference between the minimum pipeline temperature of the condenser and each real-time pipeline temperature of the condenser to obtain n temperature differences of the condenser; and calculating the variance of the n temperature differences of the condenser.
7. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S6 includes:
s61: monitoring whether a first infrared sensor at the evaporator end and a second infrared sensor at the condenser end simultaneously receive wavelength data of each molecular component contained in the refrigerant or not in real time, if yes, executing S62, and if not, continuing executing S61;
s62: and acquiring the concentration percentage of each molecular component in the total molecular component according to the received wavelength data of each molecular component.
8. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S7 includes:
s71: according to the variance of the n temperature differences of the evaporator and the variance of the n temperature differences of the condenser, performing stability correction on the concentration percentage of each molecular component in the total molecular component measured at the evaporator end and the condenser end;
s72: and judging whether the concentration percentages corresponding to the modified molecular components are all within the preset molecular concentration percentage range, if so, executing S8, otherwise, returning to S6.
9. An air conditioning refrigerant leakage detecting method according to claim 1, wherein the S8 includes:
s81: calculating the percentage change number of the cold medium amount flow in the air conditioning system, and then executing S82;
s82: judging whether the refrigerant mass flow change percentage exceeds a preset percentage, if so, executing S9, and if not, executing S83;
s83: after determining that the air conditioner is not leaking refrigerant, S1 is executed.
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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