CN110873434A - Refrigerant leakage detection method and device and air conditioner - Google Patents
Refrigerant leakage detection method and device and air conditioner Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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Abstract
The invention discloses a method and a device for detecting refrigerant leakage and an air conditioner. The refrigerant leakage detection method, the refrigerant leakage detection device and the air conditioner are beneficial to avoiding detection faults, are simple and reliable, monitor the refrigerant flow change of the air conditioning system in the operation process in real time, avoid the performance reduction of the air conditioner caused by the refrigerant leakage of the air conditioning system in the operation process, and prevent the compressor from being damaged due to long-time operation under the condition of fluorine deficiency.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a method and a device for detecting refrigerant leakage and an air conditioner.
Background
With the development of the household appliance market, air conditioners filled with various refrigerants have been developed. The air conditioner carries out heat transportation by depending on the refrigerant, the refrigerant filling amount of the air conditioner with good performance is certain, and the performance of the air conditioner can be reduced when the refrigerant amount is insufficient or more or less. The pipelines in the air conditioner are welded more, and the indoor and outdoor air conditioners are connected through connecting pipes. Due to the service life of the air conditioner and the limitation of the manufacturing process of the air conditioner, the refrigerant in the air conditioner leaks to different degrees after being used for a long time.
In the current air conditioner, the refrigerants mainly used are R22 and R410A, but in the context of Global Warming and ozone depletion, R22 and R410A are not ideal refrigerants because R22 has high ODP (ozone depletion Potential) and GWP (Global Warming Potential) and belongs to rejected refrigerants. R410A has a low ODP value but a higher GWP than R22, and belongs to an excessive refrigerant replacement.
With the gradual elimination of HCFCs refrigerants and the global warming leading to emission control of high temperature room effect coefficient (GWP) substances, flammable refrigerants are gradually becoming the trend of future room air conditioners. At present, a relatively environment-friendly refrigerant R290 (propane) exists, the ODP value is basically 0, and the ozone layer is not damaged at all. The GWP value is 20, and the influence on global warming is extremely small compared to other refrigerants. To prevent global warming, R290 is becoming the most suitable refrigerant for application. However, R290 has flammable characteristics and is poor in safety. Therefore, in the design of the electrical equipment applying the R290, the safety of the user is a problem which needs to be carefully considered.
When refrigerant leaks from the inside of the air conditioner, the refrigerant accumulates in or around the air conditioner, and the concentration of the refrigerant may exceed the safety limit of the refrigerant combustion (LFL), which may cause a fire. If other objects in the room catch fire for any reason, the traditional protective measures from the self of the air conditioner will lose the function, and the flammable refrigerant air conditioner will be exposed to the danger of burning and even explosion caused by the spread of fire in the internal environment. In the aspect of the flammable and explosive problem of flammable refrigerants, how to ensure the use reliability of the air conditioner after the refrigerants are filled becomes a problem which needs to be solved urgently at present.
From the above analysis, it is very necessary to detect the refrigerant leakage comprehensively and effectively.
The invention is provided in view of the above.
Disclosure of Invention
The present invention is intended to solve at least the above-mentioned technical problems.
Therefore, an object of the present invention is to provide a method for detecting refrigerant leakage, which can monitor the leakage of indoor refrigerant in real time, and avoid the problems of explosion and damage to an air conditioner caused by refrigerant leakage.
Another objective of the present invention is to provide a device for detecting refrigerant leakage.
Another objective of the present invention is to provide an air conditioner.
In order to achieve the above object, an embodiment of a first aspect of the present invention discloses a method for detecting refrigerant leakage, including the following steps:
s1: before the air conditioner is started, primary judgment is carried out on whether the air conditioner leaks a refrigerant, and if the primary judgment is passed, S2 is carried out;
s2: after the air conditioner runs for a preset time, judging whether the exhaust temperature of the compressor and the working current of the air conditioner meet preset conditions, if so, entering S3; if not, returning to S1;
s3: judging whether the difference value of the air inlet mass flow and the air exhaust mass flow of the compressor meets a preset condition or not according to the current operation mode, if so, enabling the air conditioner to generate refrigerant leakage, and entering S4; if not, the air conditioner does not leak the refrigerant, and the step returns to S2;
s4: the air conditioner sends out an alarm signal and controls the compressor to stop, and the step enters S5;
s5: and repairing the air conditioner and returning to the step S1.
Further, the S1 includes the following steps:
s101: acquiring the maximum value and the minimum value of the evaporator temperature in a first preset time period before the air conditioner is started, or acquiring the evaporator temperatures corresponding to a plurality of preset time points before the air conditioner is started, and determining the maximum value and the minimum value of the evaporator temperatures corresponding to the preset time points;
s102: calculating the difference value between the maximum value and the minimum value of the evaporator temperature, and comparing the difference value between the maximum value and the minimum value with a preset first threshold value;
s103: judging whether the difference value between the maximum value and the minimum value is larger than the preset first threshold value, if so, judging whether the primary judgment of the air conditioner on refrigerant leakage is failed; if not, the primary judgment for judging whether the air conditioner has refrigerant leakage is passed, and the process proceeds to S2.
Further, S2 includes the following steps:
s201: after the air conditioner is started for a second preset time, acquiring the outdoor environment temperature of the air conditioner, the exhaust temperature of the compressor, the running frequency of the compressor and the working current of the air conditioner;
s202: determining a target exhaust temperature of a compressor according to the current outdoor environment temperature of the air conditioner and the running frequency of the compressor;
s203: judging whether the exhaust temperature of the compressor is greater than the target exhaust temperature of the compressor or not and whether the working current of the air conditioner is greater than the preset current of the air conditioner or not, and if so, entering S3; if not, return to S1.
Further, in step S202, determining the target discharge temperature of the compressor according to the current outdoor environment temperature of the air conditioner and the operating frequency of the compressor includes: acquiring a preset target exhaust temperature mapping table of a compressor, wherein the target exhaust temperature mapping table of the compressor is provided with a corresponding relation between the outdoor environment temperature of the air conditioner and the running frequency of the compressor and the target exhaust temperature of the compressor; and inquiring in a target exhaust temperature mapping table of the compressor according to the outdoor environment temperature of the air conditioner and the operating frequency of the compressor to obtain the corresponding exhaust temperature of the compressor as the target exhaust temperature of the compressor.
Further, the generating of the target exhaust temperature includes:
dividing an outdoor environment temperature range of the air conditioner into a plurality of environment temperature intervals;
dividing the operating frequency range of the compressor into operating frequency intervals of a plurality of compressors;
and establishing a corresponding relation between the target exhaust temperature and the current outdoor environment temperature interval and the running frequency of the compressor.
Further, S3 includes the following steps:
s301: judging whether the current operation mode of the air conditioner is a cooling mode or a heating mode, and if the current operation mode of the air conditioner is the cooling mode, entering S302-S306; if the mode is the heating mode, the S307-S311 is entered;
s302: after the compressor operates for a third preset time according to a preset fixed frequency f1 in the refrigeration mode, the operation goes to S303;
s303: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor arranged on the compressor under the fixed frequency f1, acquiring outdoor environment temperature of an air conditioner and indoor environment temperature of the air conditioner in real time, acquiring deviation value absolute value delta m1 of preset intake mass flow and preset exhaust mass flow of the compressor corresponding to the refrigeration mode, the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner, and entering S304:
s304: calculating the absolute value of the difference between the real-time intake mass flow and the real-time exhaust mass flow, namely Δ m2, and entering S305;
s305, calculating according to a formula η 1, wherein the mass flow rate of the refrigerant is reduced by η 1 in terms of (delta m 1-delta m 2)/delta m 1%;
s306, judging whether the refrigerant mass flow rate reduction percentage η 1 is larger than a preset refrigerant mass flow rate standard reduction rate X1, if so, performing refrigerant leakage on the air conditioner, and entering S4, otherwise, performing no refrigerant leakage on the air conditioner, and returning to S2;
s307: after the compressor operates for a third preset time according to the preset fixed frequency f2 in the heating mode, the operation proceeds to S308;
s308: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor arranged on the compressor under the fixed frequency f2, acquiring outdoor environment temperature of an air conditioner and indoor environment temperature of the air conditioner in real time, acquiring deviation value absolute value delta m3 of preset intake mass flow and preset exhaust mass flow of the compressor corresponding to the heating mode, the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner, and entering S309;
s309: calculating the absolute value of the difference value delta m4 between the real-time intake mass flow and the real-time exhaust mass flow, and entering S310;
s310, calculating the mass flow rate reduction percentage of the refrigerant η 2 according to a formula η 2 ═ Δ m3- Δ m4)/Δ m 3%, and entering S311;
s311, judging whether the refrigerant mass flow rate reduction percentage η 2 is larger than a preset refrigerant mass flow rate standard reduction rate X2, if so, enabling the air conditioner to generate refrigerant leakage and enter S4, and if not, enabling the air conditioner to return to S2 without refrigerant leakage.
Further, in step S303, obtaining an absolute value Δ m1 of a deviation between the preset intake mass flow and the preset exhaust mass flow of the compressor includes:
acquiring a deviation value absolute value delta m1 mapping table in the current refrigeration mode, wherein the deviation value absolute value delta m1 mapping table is provided with a corresponding relation among the outdoor environment temperature of the air conditioner, the indoor environment temperature of the air conditioner and the deviation value absolute value delta m 1; and inquiring in the deviation value absolute value delta m1 mapping table according to the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner to obtain a corresponding deviation value absolute value of the preset intake mass flow and the preset exhaust mass flow of the compressor as the deviation value absolute value delta m 1.
Further, the step of generating the absolute value Δ m1 of the deviation value includes:
dividing the outdoor environment temperature range of the air conditioner in a refrigeration mode into a plurality of environment temperature intervals;
dividing an indoor ambient temperature range of the air conditioner in a refrigeration mode into a plurality of ambient temperature intervals;
and establishing a corresponding relation between the absolute value of the deviation value delta m1 and an outdoor environment temperature interval of the air conditioner and an indoor environment temperature interval of the air conditioner.
The embodiment of the second aspect of the invention discloses a refrigerant leakage detection device, which comprises a controller, an outdoor temperature sensor, an indoor temperature sensor, an evaporator temperature sensor, a mass flow sensor and an alarm device, wherein the controller is used for detecting the temperature of refrigerant;
the outdoor temperature sensor is arranged on an outdoor unit, is connected with the controller and is used for acquiring the outdoor environment temperature of the air conditioner;
the indoor temperature sensor is arranged on an indoor unit, connected with the controller and used for acquiring the indoor environment temperature of the air conditioner;
the evaporator temperature sensor is arranged on the evaporator, connected with the controller and used for acquiring the temperature of the evaporator;
the mass flow sensor is arranged on the compressor, is connected with the controller and is used for acquiring the air inlet mass flow and the air outlet mass flow of the compressor;
the controller is used for controlling the operation of the air conditioner, receiving information sent by the outdoor temperature sensor, the indoor temperature sensor, the evaporator temperature sensor and the mass flow sensor, and judging whether the refrigerant leaks or not;
the alarm device is used for sending out an alarm signal.
The embodiment of the third aspect of the invention discloses an air conditioner, which comprises a refrigerant leakage detection device.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
(1) according to the method, the device and the air conditioner, the primary judgment is carried out on the refrigerant leakage before the air conditioner is started, and the misjudgment of the refrigerant state caused by the refrigerant detection of the traditional air conditioner under special conditions is avoided.
(2) According to the method, the device and the air conditioner, secondary judgment is adopted after the air conditioner is started, first judgment is carried out through the exhaust temperature of the compressor and the working current of the air conditioner, then second judgment is carried out through the mass flow change in the refrigerant flow path of the air conditioner, the primary judgment, the first judgment and the second judgment are circularly buckled, and a complete refrigerant leakage detection method is formed, so that the accuracy of refrigerant leakage detection is improved, the safety of the air conditioner using a combustible refrigerant is improved, and the damage caused by long-time operation of the compressor of the air conditioner under the condition of fluorine deficiency is effectively prevented.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Description of the drawings:
in order to more clearly illustrate the technical solution of the present invention, the drawings of the present invention will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
Fig. 1 is a schematic diagram illustrating a method for detecting refrigerant leakage according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for detecting refrigerant leakage according to an embodiment of the present invention;
fig. 3 is a refrigerant leakage detection apparatus according to an embodiment of the present invention.
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described:
1-controller, 2-outdoor temperature sensor, 3-indoor temperature sensor, 4-evaporator temperature sensor, 5-mass flow sensor and 6-alarm device.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in detail below by way of examples.
Example 1:
as shown in fig. 3, a refrigerant leakage detection device includes a controller 1, an outdoor temperature sensor 2, an indoor temperature sensor 3, an evaporator temperature sensor 4, a mass flow sensor 5, and an alarm device 6;
the outdoor temperature sensor 2 is arranged on an outdoor unit, is connected with the controller 1, and is used for acquiring the outdoor environment temperature of the air conditioner;
the indoor temperature sensor 3 is arranged on an indoor unit, connected with the controller 1 and used for acquiring the indoor environment temperature of the air conditioner;
the evaporator temperature sensor 4 is arranged on the evaporator, connected with the controller 1 and used for acquiring the temperature of the evaporator;
the mass flow sensor 5 is arranged on the compressor, connected with the controller 1 and used for acquiring the intake mass flow and the exhaust mass flow of the compressor;
the controller 1 is used for controlling the operation of the air conditioner, receiving information sent by the outdoor temperature sensor 2, the indoor temperature sensor 3, the evaporator temperature sensor 4 and the mass flow sensor 5, and judging whether the refrigerant leaks;
the alarm device 6 is used for sending out alarm signals.
Example 2:
as shown in fig. 1, a method for detecting refrigerant leakage includes the following steps:
s1: before the air conditioner is started, primary judgment is carried out on whether the air conditioner leaks a refrigerant, and if the primary judgment is passed, S2 is carried out;
specifically, the step S1 includes the following steps:
s101: acquiring the maximum value and the minimum value of the evaporator temperature in a first preset time period before the air conditioner is started, or acquiring the evaporator temperatures corresponding to a plurality of preset time points before the air conditioner is started, and determining the maximum value and the minimum value of the evaporator temperatures corresponding to the preset time points;
s102: calculating the difference value between the maximum value and the minimum value of the evaporator temperature, and comparing the difference value between the maximum value and the minimum value with a preset first threshold value;
s103: judging whether the difference value between the maximum value and the minimum value is larger than the preset first threshold value, if so, judging whether the primary judgment of the air conditioner on refrigerant leakage is failed; if not, the primary judgment for judging whether the air conditioner has refrigerant leakage is passed, and the process proceeds to S2.
Specifically, under the condition that the valve is started, the temperature of the evaporator is caused to be excessively changed, when the difference value between the maximum value and the minimum value of the temperature of the evaporator is larger than a preset first threshold value, the refrigerating effect of the air conditioner is caused to be poor, the subsequent step of judging whether the refrigerant is leaked occurs, and whether the refrigerant leakage occurs to the air conditioner cannot be truly reflected, so that the refrigerant leakage needs to be primarily judged before the air conditioner is started in order to avoid misjudgment of the refrigerant state caused by refrigerant detection of the traditional air conditioner under special conditions.
For example, the evaporator temperature is acquired within 1 minute before the air conditioner is turned on, the maximum value and the minimum value of the evaporator temperature within 1 minute are determined, or the evaporator temperature at the time of 10s/20s/30s/60s before the air conditioner is turned on is acquired, the maximum value and the minimum value of the four evaporator temperature values are determined, the difference between the maximum value and the minimum value of the evaporator temperature is calculated, and the difference between the calculated maximum value and the calculated minimum value is compared with a first threshold value to determine whether the change of the evaporator temperature is excessive.
S2: after the air conditioner runs for a preset time, judging whether the exhaust temperature of the compressor and the working current of the air conditioner meet preset conditions, if so, entering S3; if not, returning to S1;
specifically, the step S2 includes the following steps:
s201: after the air conditioner is started for a second preset time, acquiring the outdoor environment temperature of the air conditioner, the exhaust temperature of the compressor, the running frequency of the compressor and the working current of the air conditioner;
s202: determining a target exhaust temperature of a compressor according to the current outdoor environment temperature of the air conditioner and the running frequency of the compressor;
s203: judging whether the exhaust temperature of the compressor is greater than the target exhaust temperature of the compressor or not and whether the working current of the air conditioner is greater than the preset current of the air conditioner or not, if so, the air conditioner is likely to leak refrigerants, and further determining whether the air conditioner leaks or not to prevent misjudgment and entering S3; if not, return to S1.
Specifically, when the starting time of the compressor does not reach the preset time, that is, the timing time of the timer does not reach the preset time, the compressor is in an unstable state, and at the moment, the refrigerant leakage detection function does not work, that is, whether the refrigerant leakage occurs to the air conditioner is not judged.
Specifically, under normal refrigeration or heating cycle, the air conditioner has a normal range of exhaust temperature and working current, but when a part of the refrigeration system leaks, the exhaust temperature is higher than the normal exhaust temperature, and the working current deviates from the preset current of the air conditioner. Therefore, if the exhaust temperature of the compressor is detected to be greater than the target exhaust temperature or the working current of the compressor deviates from the preset current range of the air conditioner under the current operation working condition, it can be shown that refrigerant leakage may occur in the refrigeration system.
Specifically, the air conditioner corresponds to different target exhaust temperatures under different working conditions, so that before control, the current operating condition of the air conditioner, that is, the current outdoor environment temperature of the air conditioner and the operating frequency of the compressor need to be acquired, and the target exhaust temperature corresponding to the current operating condition is acquired according to the current operating condition.
Specifically, the preset current may be determined according to an actual model of the air conditioner.
Specifically, in step S202, determining the target discharge temperature of the compressor according to the current outdoor environment temperature of the air conditioner and the operating frequency of the compressor includes: acquiring a preset target exhaust temperature mapping table of a compressor, wherein the target exhaust temperature mapping table of the compressor is provided with a corresponding relation between the outdoor environment temperature of the air conditioner and the running frequency of the compressor and the target exhaust temperature of the compressor; and inquiring in a target exhaust temperature mapping table of the compressor according to the outdoor environment temperature of the air conditioner and the operating frequency of the compressor to obtain the corresponding exhaust temperature of the compressor as the target exhaust temperature of the compressor.
Specifically, the target exhaust gas temperature generation step includes:
dividing an outdoor environment temperature range of the air conditioner into a plurality of environment temperature intervals;
dividing the operating frequency range of the compressor into operating frequency intervals of a plurality of compressors;
and establishing a corresponding relation between the target exhaust temperature and the current outdoor environment temperature interval and the running frequency of the compressor.
S3: judging whether the difference value of the air inlet mass flow and the air exhaust mass flow of the compressor meets a preset condition or not according to the current operation mode, if so, enabling the air conditioner to generate refrigerant leakage, and entering S4; if not, the air conditioner does not leak the refrigerant, and the step returns to S2;
specifically, the step S3 includes the following steps:
s301: judging whether the current operation mode of the air conditioner is a cooling mode or a heating mode, and if the current operation mode of the air conditioner is the cooling mode, entering S302-S306; if the mode is the heating mode, the S307-S311 is entered;
s302: after the compressor operates for a third preset time according to a preset fixed frequency f1 in the refrigeration mode, the operation goes to S303;
s303: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor 5 arranged on the compressor under the fixed frequency f1, acquiring outdoor environment temperature of an air conditioner and indoor environment temperature of the air conditioner in real time, acquiring a deviation value absolute value delta m1 of preset intake mass flow and preset exhaust mass flow of the compressor corresponding to the refrigeration mode, the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner, and entering S304;
s304: calculating the absolute value of the difference between the real-time intake mass flow and the real-time exhaust mass flow, namely Δ m2, and entering S305;
s305, calculating according to a formula η 1, wherein the mass flow rate of the refrigerant is reduced by η 1 in terms of (delta m 1-delta m 2)/delta m 1%;
s306, judging whether the refrigerant mass flow rate reduction percentage η 1 is larger than a preset refrigerant mass flow rate standard reduction rate X1, if so, performing refrigerant leakage on the air conditioner, and entering S4, otherwise, performing no refrigerant leakage on the air conditioner, and returning to S2;
s307: after the compressor operates for a third preset time according to the preset fixed frequency f2 in the heating mode, the operation proceeds to S308;
s308: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor 5 arranged on the compressor under the fixed frequency f2, acquiring outdoor environment temperature of an air conditioner and indoor environment temperature of the air conditioner in real time, acquiring a deviation value absolute value delta m3 of preset intake mass flow and preset exhaust mass flow of the compressor corresponding to the heating mode, the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner, and entering S309;
s309: calculating the absolute value of the difference value delta m4 between the real-time intake mass flow and the real-time exhaust mass flow, and entering S310;
s310, calculating the mass flow rate reduction percentage of the refrigerant η 2 according to a formula η 2 ═ Δ m3- Δ m4)/Δ m 3%, and entering S311;
s311, judging whether the refrigerant mass flow rate reduction percentage η 2 is larger than a preset refrigerant mass flow rate standard reduction rate X2, if so, enabling the air conditioner to generate refrigerant leakage and enter S4, and if not, enabling the air conditioner to return to S2 without refrigerant leakage.
Specifically, to specific system (internal machine capacity, connecting pipe length and standard refrigerant volume), under specific operating mode (refrigeration or refrigeration mode, the compressor operation is at fixed frequency, and trouble such as refrigerant leakage does not appear), the mass flow of each point in the system pipeline keeps unchangeable characteristics basically in a certain tiny range, set up mass flow sensor 5 on the compressor, acquire the intake mass flow and the exhaust mass flow of compressor in real time, calculate the flowmeter difference at this part both ends, compare with preset deviation value Δ m, judge whether the refrigerant leaks, thereby be favorable to in time discovering the refrigerant and revealing and supplementing the refrigerant, the effectual compressor that prevents the air conditioner runs the damage that causes for a long time under the fluorine deficiency condition.
Specifically, in step S303, obtaining an absolute value Δ m1 of a deviation between the preset intake mass flow and the preset exhaust mass flow of the compressor includes:
acquiring a deviation value absolute value delta m1 mapping table in the current refrigeration mode, wherein the deviation value absolute value delta m1 mapping table is provided with a corresponding relation among the outdoor environment temperature of the air conditioner, the indoor environment temperature of the air conditioner and the deviation value absolute value delta m 1; and inquiring in the deviation value absolute value delta m1 mapping table according to the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner to obtain a corresponding deviation value absolute value of the preset intake mass flow and the preset exhaust mass flow of the compressor as the deviation value absolute value delta m 1.
Specifically, the step of generating the absolute value Δ m1 of the deviation value includes:
dividing the outdoor environment temperature range of the air conditioner in a refrigeration mode into a plurality of environment temperature intervals;
dividing an indoor ambient temperature range of the air conditioner in a refrigeration mode into a plurality of ambient temperature intervals;
and establishing a corresponding relation between the absolute value of the deviation value delta m1 and an outdoor environment temperature interval of the air conditioner and an indoor environment temperature interval of the air conditioner.
Specifically, when the refrigerant mass flow rate reduction percentage η is greater than the preset percentage threshold X, refrigerant leakage is determined, and when the refrigerant mass flow rate reduction percentage η is not greater than the preset percentage threshold X, it is determined that the air conditioner has no refrigerant leakage or the leakage does not affect the performance of the air conditioner.
S4: the air conditioner sends out an alarm signal and controls the compressor to stop, and the step enters S5;
s5: and repairing the air conditioner and returning to the step S1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for detecting refrigerant leakage is characterized by comprising the following steps:
s1: before the air conditioner is started, primarily judging whether the air conditioner leaks refrigerants or not, and if not, entering S2;
s2: after the air conditioner runs for a preset time, judging whether the exhaust temperature of the compressor and the working current of the air conditioner meet preset conditions, if so, entering S3; if not, returning to S1;
s3: judging whether the difference value of the air inlet mass flow and the air exhaust mass flow of the compressor meets a preset condition or not according to the current operation mode, if so, enabling the air conditioner to generate refrigerant leakage, and entering S4; if not, the air conditioner does not leak the refrigerant, and the step returns to S2;
s4: the air conditioner sends out an alarm signal and controls the compressor to stop, and the step enters S5;
s5: and repairing the air conditioner and returning to the step S1.
2. The refrigerant leakage detection method according to claim 1, wherein the S1 includes:
s101: acquiring the maximum value and the minimum value of the evaporator temperature in a first preset time period before the air conditioner is started, or acquiring the evaporator temperatures corresponding to a plurality of preset time points before the air conditioner is started, and determining the maximum value and the minimum value of the evaporator temperatures corresponding to the preset time points;
s102: calculating the difference value between the maximum value and the minimum value of the evaporator temperature, and comparing the difference value between the maximum value and the minimum value with a preset first threshold value;
s103: judging whether the difference value between the maximum value and the minimum value is larger than the preset first threshold value, if so, judging whether the primary judgment of the air conditioner on refrigerant leakage is failed; if not, the primary judgment for judging whether the air conditioner has refrigerant leakage is passed, and the process proceeds to S2.
3. The refrigerant leakage detection method as claimed in claim 1, wherein the S2 includes the steps of:
s201: after the air conditioner is started for a second preset time, acquiring the outdoor environment temperature of the air conditioner, the exhaust temperature of the compressor, the running frequency of the compressor and the working current of the air conditioner;
s202: determining a target exhaust temperature of a compressor according to the current outdoor environment temperature of the air conditioner and the running frequency of the compressor;
s203: judging whether the exhaust temperature of the compressor is greater than the target exhaust temperature of the compressor or not and whether the working current of the air conditioner is greater than the preset current of the air conditioner or not, and if so, entering S3; if not, return to S1.
4. The method of claim 3, wherein the determining the target discharge temperature of the compressor according to the current outdoor environment temperature of the air conditioner and the operating frequency of the compressor in step S202 comprises: acquiring a preset target exhaust temperature mapping table of a compressor, wherein the target exhaust temperature mapping table of the compressor is provided with a corresponding relation between the outdoor environment temperature of the air conditioner and the running frequency of the compressor and the target exhaust temperature of the compressor; and inquiring in a target exhaust temperature mapping table of the compressor according to the outdoor environment temperature of the air conditioner and the operating frequency of the compressor to obtain the corresponding exhaust temperature of the compressor as the target exhaust temperature of the compressor.
5. The refrigerant leakage detection method according to claim 4,
the generating of the target exhaust temperature includes:
dividing an outdoor environment temperature range of the air conditioner into a plurality of environment temperature intervals;
dividing the operating frequency range of the compressor into operating frequency intervals of a plurality of compressors;
and establishing a corresponding relation between the target exhaust temperature and the current outdoor environment temperature interval and the running frequency of the compressor.
6. The refrigerant leakage detection method as claimed in claim 1, wherein the S3 includes the steps of:
s301: judging whether the current operation mode of the air conditioner is a cooling mode or a heating mode, and if the current operation mode of the air conditioner is the cooling mode, entering S302-S306; if the mode is the heating mode, the S307-S311 is entered;
s302: after the compressor operates for a third preset time according to a preset fixed frequency f1 in the refrigeration mode, the operation goes to S303;
s303: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor arranged on the compressor under the fixed frequency f1, acquiring outdoor environment temperature of an air conditioner and indoor environment temperature of the air conditioner in real time, acquiring deviation value absolute value delta m1 of preset intake mass flow and preset exhaust mass flow of the compressor corresponding to the refrigeration mode, the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner, and entering S304;
s304: calculating the absolute value of the difference between the real-time intake mass flow and the real-time exhaust mass flow, namely Δ m2, and entering S305;
s305, calculating according to a formula η 1, wherein the mass flow rate of the refrigerant is reduced by η 1 in terms of (delta m 1-delta m 2)/delta m 1%;
s306, judging whether the refrigerant mass flow rate reduction percentage η 1 is larger than a preset refrigerant mass flow rate standard reduction rate X1, if so, performing refrigerant leakage on the air conditioner, and entering S4, otherwise, performing no refrigerant leakage on the air conditioner, and returning to S2;
s307: after the compressor operates for a third preset time according to the preset fixed frequency f2 in the heating mode, the operation proceeds to S308;
s308: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor arranged on the compressor under the fixed frequency f2, acquiring outdoor environment temperature of an air conditioner and indoor environment temperature of the air conditioner in real time, acquiring deviation value absolute value delta m3 of preset intake mass flow and preset exhaust mass flow of the compressor corresponding to the heating mode, the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner, and entering S309;
s309: calculating the absolute value of the difference value delta m4 between the real-time intake mass flow and the real-time exhaust mass flow, and entering S310;
s310, calculating the mass flow rate reduction percentage of the refrigerant η 2 according to a formula η 2 ═ Δ m3- Δ m4)/Δ m 3%, and entering S311;
s311, judging whether the refrigerant mass flow rate reduction percentage η 2 is larger than a preset refrigerant mass flow rate standard reduction rate X2, if so, enabling the air conditioner to generate refrigerant leakage and enter S4, and if not, enabling the air conditioner to return to S2 without refrigerant leakage.
7. The method of claim 6, wherein the step S303 of obtaining an absolute value Δ m1 of a deviation between the preset intake mass flow and the preset exhaust mass flow of the compressor comprises:
acquiring a deviation value absolute value delta m1 mapping table in the current refrigeration mode, wherein the deviation value absolute value delta m1 mapping table is provided with a corresponding relation among the outdoor environment temperature of the air conditioner, the indoor environment temperature of the air conditioner and the deviation value absolute value delta m 1; and inquiring in the deviation value absolute value delta m1 mapping table according to the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner to obtain a corresponding deviation value absolute value of the preset intake mass flow and the preset exhaust mass flow of the compressor as the deviation value absolute value delta m 1.
8. The refrigerant leakage detection method according to claim 7,
the step of generating the deviation value absolute value Δ m1 includes:
dividing the outdoor environment temperature range of the air conditioner in a refrigeration mode into a plurality of environment temperature intervals;
dividing an indoor ambient temperature range of the air conditioner in a refrigeration mode into a plurality of ambient temperature intervals;
and establishing a corresponding relation between the absolute value of the deviation value delta m1 and an outdoor environment temperature interval of the air conditioner and an indoor environment temperature interval of the air conditioner.
9. A detection device for refrigerant leakage is characterized by comprising a controller, an outdoor temperature sensor, an indoor temperature sensor, an evaporator temperature sensor, a mass flow sensor and an alarm device;
the outdoor temperature sensor is arranged on the outdoor unit, is connected with the controller and is used for acquiring the outdoor environment temperature of the air conditioner;
the indoor temperature sensor is arranged on an indoor unit, connected with the controller and used for acquiring the indoor environment temperature of the air conditioner;
the evaporator temperature sensor is arranged on the evaporator, connected with the controller and used for acquiring the temperature of the evaporator;
the mass flow sensor is arranged on the compressor, is connected with the controller and is used for acquiring the air inlet mass flow and the air outlet mass flow of the compressor;
the controller is used for controlling the operation of the air conditioner, receiving information sent by the outdoor temperature sensor, the indoor temperature sensor, the evaporator temperature sensor and the mass flow sensor, and judging whether the refrigerant leaks or not;
the alarm device is used for sending out an alarm signal.
10. An air conditioner, characterized in that, the air conditioner includes the refrigerant leakage detection device of claim 9.
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