CN110887165B - 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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- CN110887165B CN110887165B CN201811053911.5A CN201811053911A CN110887165B CN 110887165 B CN110887165 B CN 110887165B CN 201811053911 A CN201811053911 A CN 201811053911A CN 110887165 B CN110887165 B CN 110887165B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
Abstract
The invention discloses a method and a device for detecting refrigerant leakage and an air conditioner. The refrigerant leakage detection method is beneficial to avoiding detection faults, is simple and reliable, monitors the refrigerant flow change of the air-conditioning system in the operation process in real time, avoids the performance reduction of the air conditioner caused by refrigerant leakage of the air-conditioning system in the operation process, and prevents 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. Due to the limitation of the service life of the air conditioner and 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 layer destruction, 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. In the aspect of the problem of flammability and explosiveness of flammable refrigerants, how to safely fill refrigerants and ensure the use reliability of the air conditioner after the refrigerants are filled is a problem which is urgently needed to be solved at present.
When the 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 safe lower Limit of Flammability (LFL) of the refrigerant, thereby causing a fire hazard. 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.
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 the 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, primarily judging whether the air conditioner has refrigerant leakage or not, and if not, entering S2;
s2: after the air conditioner operates for a second preset time, judging whether the exhaust temperature of the compressor meets a preset condition, if so, entering S3; if not, the refrigerant of the air conditioner is not leaked, and the detection program is quitted;
s3: adjusting the target variable quantity of the refrigerant temperature according to the operation mode of the air conditioner, and entering S4;
s4: after the air conditioner operates for a third preset time, judging whether the operating frequency of the compressor and the working current of the air conditioner meet preset conditions, if so, entering S5; if not, the refrigerant of the air conditioner is not leaked, and the detection program is quitted;
s5: judging whether the difference value of the air inlet mass flow and the air outlet mass flow of the compressor meets a preset condition, if so, leaking the refrigerant of the air conditioner, and entering S6; if not, returning to S2;
s6: the air conditioner sends out a refrigerant leakage alarm signal and controls the compressor to stop, and the operation enters S7;
s7: 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 a difference between a maximum value and a minimum value of the evaporator temperature;
s103: judging whether the difference value between the maximum value and the minimum value of the evaporator temperature is greater than a preset first threshold value, if so, judging whether the primary judgment of the air conditioner on refrigerant leakage fails; if not, the primary determination of 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 operates for a second preset time, acquiring the outdoor environment temperature of the air conditioner, the exhaust temperature of the compressor and the operating frequency of the compressor;
s202: determining a target exhaust temperature of the 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, if so, setting N to be N +1, setting the initial value of N to be 0, and entering S204; if not, the air conditioner has no leakage, and the detection program is quitted;
s204: judging whether N is larger than 2, if so, clearing the value of N, and entering S3; if not, return to S201.
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 the 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, 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-S303; if the mode is the heating mode, the S304-S305 is entered;
s302: acquiring the exhaust temperature of the compressor, judging whether the exhaust temperature of the compressor is greater than or equal to a first preset superheat degree, and if so, entering S4; if not, increasing the target superheat degree of the air conditioner by a first preset value, and entering S303;
s303: acquiring the exhaust temperature of the compressor, judging whether the exhaust temperature of the compressor is greater than or equal to the first preset superheat degree, if so, controlling the air conditioner to continuously operate, and entering S4; if not, the air conditioner generates refrigerant leakage;
s304: reducing the target supercooling degree of the air conditioner by a second preset value, and entering S305;
s305: judging whether the liquid accumulation coefficient of the air conditioner and the opening degree of the throttling element both meet preset conditions, if so, continuing to operate the air conditioner, and entering S4; if not, the air conditioner generates refrigerant leakage.
Further, S4 includes the following steps:
s401: after the compressor operates at the preset fixed frequency for a third preset time, the operation enters S402;
s402: acquiring the running frequency of the compressor and the working current of the air conditioner in real time, and entering S403;
s403, judging whether the running frequency of the compressor is greater than a preset frequency, if so, entering S404; if not, the air conditioner has no leakage, and the detection program is quitted;
s404: judging whether the working current of the air conditioner is larger than a preset current or not, and if so, entering S5; if not, the air conditioner has no leakage, and the detection program is quitted.
Further, S5 includes the following steps:
s501: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor arranged on the compressor, acquiring outdoor ambient temperature of the air conditioner and indoor ambient temperature of the air conditioner in real time, and entering S502;
s502: acquiring an absolute value Δ m1 of a deviation value between a preset intake mass flow and a preset exhaust mass flow of the compressor corresponding to an outdoor ambient temperature of the air conditioner and an indoor ambient temperature of the air conditioner, and entering S503;
s503: calculating the absolute value Δ m2 of the difference between the real-time intake mass flow and the real-time exhaust mass flow, and entering S504;
s504: calculating according to a formula eta (delta m 1-delta m 2)/(delta m 1) to obtain the mass flow rate reduction percentage eta of the refrigerant;
s505, judging whether the refrigerant mass flow rate reduction percentage eta is greater than a preset refrigerant mass flow rate standard reduction rate X, if so, leading the air conditioner to generate refrigerant leakage, and entering S4; if not, the air conditioner does not have refrigerant leakage, and the process returns to the step S2.
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 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.
Further, the controller comprises a control module, the control module is used for judging whether the air conditioner has refrigerant leakage or not, and further acquiring the current operation mode of the air conditioner when the air conditioner does not have refrigerant leakage, wherein if the current operation mode of the air conditioner is a refrigeration mode, the control module adjusts the target superheat degree of the air conditioner to enable the air conditioner to continue to operate; and if the current operation mode of the air conditioner is the heating mode, the control module adjusts the target supercooling degree of the air conditioner so as to enable the air conditioner to continuously operate.
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) the method, the device and the air conditioner of the invention carry out primary judgment on the refrigerant leakage before the air conditioner is started, thereby avoiding the misjudgment of the refrigerant state caused by the refrigerant detection of the traditional air conditioner under special conditions.
(2) The method, the device and the air conditioner adopt four-stage judgment on whether the refrigerant of the air conditioner leaks, firstly carry out the first judgment through the difference value between the maximum value and the minimum value of the temperature of the evaporator before the air conditioner is started, carry out the second judgment through the exhaust temperature of the compressor after the air conditioner is started, then carry out the third judgment through the operating frequency of the compressor and the working current of the air conditioner, and finally carry out the fourth judgment through the mass flow change in the refrigerant flow path of the air conditioner, and the four judgment rings are buckled to form a complete refrigerant leakage detection method, thereby improving the accuracy of refrigerant leakage detection, improving the safety of the air conditioner using flammable refrigerants and effectively preventing the compressor of the air conditioner from being damaged due to long-time operation under the condition of fluorine deficiency.
(3) The invention reduces the probability of misjudgment and improves the accuracy of refrigerant detection by using the counter.
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 view 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.
Specifically, the controller 1 includes a control module, where the control module is configured to determine whether the air conditioner has refrigerant leakage, and further obtain a current operation mode of the air conditioner when the air conditioner has no refrigerant leakage, where if the current operation mode of the air conditioner is a refrigeration mode, the control module adjusts a target superheat degree of the air conditioner to enable the air conditioner to continue to operate; and if the current operation mode of the air conditioner is the heating mode, the control module adjusts the target supercooling degree of the air conditioner so as to enable the air conditioner to continuously operate.
Example 2:
as shown in fig. 1-2, 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 refrigerants or not, if not, the primary judgment is passed, and S2 is carried out;
specifically, 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 a difference between a maximum value and a minimum value of the evaporator temperature;
s103: judging whether the difference value between the maximum value and the minimum value of the evaporator temperature is greater than a preset first threshold value, if so, judging whether the primary judgment of the air conditioner on refrigerant leakage fails; if not, the primary determination of 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 poor, the subsequent step of judging whether the refrigerant leaks can cause problems, and whether the refrigerant leaks from the air conditioner can not be truly reflected, so that the refrigerant leakage needs to be primarily judged before the air conditioner is started in order to avoid the misjudgment of the refrigerant state caused by the 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 operates for a second preset time, judging whether the exhaust temperature of the compressor meets a preset condition, if so, entering S3; if not, the refrigerant of the air conditioner is not leaked, and the detection program is quitted;
specifically, S2 includes the following steps:
s201: after the air conditioner operates for a second preset time, acquiring the outdoor environment temperature of the air conditioner, the exhaust temperature of the compressor and the operating frequency of the compressor;
s202: determining a target exhaust temperature of the 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, if so, setting N to be N +1, setting the initial value of N to be 0, and entering S204; if not, the air conditioner has no leakage, and the detection program is quitted;
s204: judging whether N is larger than 2, if so, clearing the value of N, and entering S3; if not, return to S201.
Specifically, when the starting time of the compressor does not reach the preset time, that is, the timing time of the counter does not reach the preset time, the compressor is in an unstable state, and at this time, the refrigerant leakage detection function does not work, that is, whether the air conditioner has refrigerant leakage cannot be judged.
Specifically, under normal cooling or heating cycles, the air conditioner has a normal range of discharge temperature, but when some leakage occurs in the refrigeration system, the discharge temperature is higher than the normal discharge temperature. Therefore, if the detected exhaust temperature of the compressor is greater than the target exhaust temperature under the current operation condition, it can be said 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, a counter is provided in this embodiment, and an initialization value of the counter is 0. In this embodiment, the count threshold N is set to 2, and if and only if the counter continues to count and accumulate to the count threshold 2, the next determination will be continued. If all the determination results are not yes when the determination of S203 is repeated, no is present in the determination results; if the judgment result has an error, the refrigerant leakage is not judged. The counter is used in the embodiment, so that the accuracy of air conditioner refrigerant leakage judgment is effectively improved, and the occurrence of air conditioner refrigerant leakage misjudgment is reduced.
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 the 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: adjusting the target variable quantity of the refrigerant temperature according to the operation mode of the air conditioner, and entering S4;
specifically, 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-S303; if the mode is the heating mode, the S304-S305 is entered;
s302: acquiring the exhaust temperature of the compressor, judging whether the exhaust temperature of the compressor is greater than or equal to a first preset superheat degree, and if so, entering S4; if not, increasing the target superheat degree of the air conditioner by a first preset value, and entering S303;
s303: acquiring the exhaust temperature of the compressor, judging whether the exhaust temperature of the compressor is greater than or equal to the first preset superheat degree, if so, controlling the air conditioner to continuously operate, and entering S4; if not, the air conditioner generates refrigerant leakage;
s304: reducing the target supercooling degree of the air conditioner by a second preset value, and entering S305;
s305: judging whether the liquid accumulation coefficient of the air conditioner and the opening degree of the throttling element both meet preset conditions, if so, continuing to operate the air conditioner, and entering S4; if not, the air conditioner generates refrigerant leakage.
Specifically, the target variable quantity of the refrigerant temperature is adjusted in the refrigerating mode or the heating mode, so that the accuracy of judgment of the refrigerant leakage of the air conditioner is improved, and the phenomenon of misjudgment of the refrigerant leakage of the air conditioner is reduced.
S4: after the air conditioner operates for a third preset time, judging whether the operating frequency of the compressor and the working current of the air conditioner meet preset conditions, if so, entering S5; if not, the refrigerant of the air conditioner is not leaked, and the detection program is quitted;
specifically, S4 includes the following steps:
s401: after the compressor operates at the preset fixed frequency for a third preset time, the operation enters S402;
s402: acquiring the running frequency of the compressor and the working current of the air conditioner in real time, and entering S403;
s403, judging whether the running frequency of the compressor is greater than a preset frequency, if so, entering S404; if not, the air conditioner has no leakage, and the detection program is quitted;
s404: judging whether the working current of the air conditioner is larger than a preset current or not, and if so, entering S5; if not, the air conditioner has no leakage, and the detection program is quitted.
Specifically, under normal cooling or heating cycles, the air conditioner has a normal range of operating current and operating frequency, but when some leakage occurs in the cooling system, the operating current and operating frequency may deviate from the preset current and operating frequency of the air conditioner. Therefore, if the working current is detected to deviate from the preset current range of the air conditioner and the operating frequency deviates from the preset frequency range, the refrigerant leakage of the refrigeration system can be indicated.
Specifically, the preset current may be determined according to an actual model of the air conditioner.
S5: judging whether the difference value of the air inlet mass flow and the air outlet mass flow of the compressor meets a preset condition, if so, leaking the refrigerant of the air conditioner, and entering S6; if not, returning to S2;
specifically, S5 includes the following steps:
s501: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor 5 arranged on the compressor, acquiring outdoor ambient temperature of the air conditioner and indoor ambient temperature of the air conditioner in real time, and entering S502;
s502: acquiring an absolute value Δ m1 of a deviation value between a preset intake mass flow and a preset exhaust mass flow of the compressor corresponding to an outdoor ambient temperature of the air conditioner and an indoor ambient temperature of the air conditioner, and entering S503;
s503: calculating the absolute value Δ m2 of the difference between the real-time intake mass flow and the real-time exhaust mass flow, and entering S504;
s504: calculating according to a formula eta (delta m 1-delta m 2)/(delta m 1) to obtain the mass flow rate reduction percentage eta of the refrigerant;
s505, judging whether the refrigerant mass flow rate reduction percentage eta is greater than a preset refrigerant mass flow rate standard reduction rate X, if so, leading the air conditioner to generate refrigerant leakage, and entering S4; if not, the air conditioner does not have refrigerant leakage, and the process returns to the step S2.
Specifically, aiming at a specific system (internal machine capacity, connecting pipe length and standard refrigerant quantity), under a specific working condition (refrigeration or refrigeration mode, the compressor operates at a fixed frequency, and faults such as refrigerant leakage do not occur), the mass flow of each point in a system pipeline is basically kept unchanged in a certain tiny range, a mass flow sensor 5 is arranged on the compressor, the air inlet mass flow and the air outlet mass flow of the compressor are obtained in real time, the difference value of flow meters at two ends of the component is calculated, and is compared with a preset deviation value delta m to judge whether the refrigerant leaks or not, so that the refrigerant leakage and the refrigerant supplement are favorably found in time, and the damage caused by long-time operation of the compressor of the air conditioner under the condition of fluorine deficiency is effectively prevented.
Specifically, in step S502, 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 Deltam 1 mapping table in the current refrigeration mode, wherein the deviation value absolute value Deltam 1 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 Deltam 1; and inquiring in the deviation value absolute value Deltam 1 mapping table according to the outdoor environment temperature of the air conditioner and the indoor environment temperature of the air conditioner to obtain a deviation value absolute value of the corresponding preset air inlet mass flow and preset air outlet mass flow of the compressor as the deviation value absolute value Deltam 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 Deltam 1 of the deviation value 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 a preset percentage threshold value X, refrigerant leakage is determined, and when the refrigerant mass flow rate reduction percentage η is not greater than the preset percentage threshold value X, it is stated that the air conditioner has no refrigerant leakage or the leakage does not affect the performance of the air conditioner.
S6: the air conditioner sends out a refrigerant leakage alarm signal and controls the compressor to stop, and the operation enters S7;
s7: 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 (8)
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 has refrigerant leakage or not, and if not, entering S2;
s2: after the air conditioner operates for a second preset time, judging whether the exhaust temperature of the compressor meets a preset condition, if so, entering S3; if not, the refrigerant of the air conditioner is not leaked, and the detection program is quitted;
s3: adjusting the target variable quantity of the refrigerant temperature according to the operation mode of the air conditioner, and entering S4;
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-S303; if the mode is the heating mode, the S304-S305 is entered;
s302: acquiring the exhaust temperature of the compressor, judging whether the exhaust temperature of the compressor is greater than or equal to a first preset superheat degree, and if so, entering S4; if not, increasing the target superheat degree of the air conditioner by a first preset value, and entering S303;
s303: acquiring the exhaust temperature of the compressor, judging whether the exhaust temperature of the compressor is greater than or equal to the first preset superheat degree, if so, controlling the air conditioner to continuously operate, and entering S4; if not, the air conditioner generates refrigerant leakage;
s304: reducing the target supercooling degree of the air conditioner by a second preset value, and entering S305;
s305: judging whether the liquid accumulation coefficient of the air conditioner and the opening degree of the throttling element both meet preset conditions, if so, continuing to operate the air conditioner, and entering S4; if not, the air conditioner generates refrigerant leakage;
s4: after the air conditioner operates for a third preset time, judging whether the operating frequency of the compressor and the working current of the air conditioner meet preset conditions, if so, entering S5; if not, the refrigerant of the air conditioner is not leaked, and the detection program is quitted;
s5: judging whether the difference value of the air inlet mass flow and the air outlet mass flow of the compressor meets a preset condition, if so, leaking the refrigerant of the air conditioner, and entering S6; if not, returning to S2;
s6: the air conditioner sends out a refrigerant leakage alarm signal and controls the compressor to stop, and the operation enters S7;
s7: and repairing the air conditioner and returning to the step S1.
2. The method for detecting refrigerant leakage according to claim 1, wherein the step 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 a difference between a maximum value and a minimum value of the evaporator temperature;
s103: judging whether the difference value between the maximum value and the minimum value of the evaporator temperature is greater than a preset first threshold value, if so, judging whether the primary judgment of the air conditioner on refrigerant leakage fails; if not, the primary determination of whether the air conditioner has refrigerant leakage is passed, and the process proceeds to S2.
3. The method for detecting refrigerant leakage according to claim 1, wherein S2 includes the steps of:
s201: after the air conditioner operates for a second preset time, acquiring the outdoor environment temperature of the air conditioner, the exhaust temperature of the compressor and the operating frequency of the compressor;
s202: determining a target exhaust temperature of the 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, if so, setting N to be N +1, setting the initial value of N to be 0, and entering S204; if not, the air conditioner has no leakage, and the detection program is quitted;
s204: judging whether N is larger than 2, if so, clearing the value of N, and entering S3; if not, return to S201.
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 the 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 method for detecting refrigerant leakage according to claim 1, wherein S4 includes the steps of:
s401: after the compressor operates at the preset fixed frequency for a third preset time, the operation enters S402;
s402: acquiring the running frequency of the compressor and the working current of the air conditioner in real time, and entering S403;
s403, judging whether the running frequency of the compressor is greater than a preset frequency, if so, entering S404; if not, the air conditioner has no leakage, and the detection program is quitted;
s404: judging whether the working current of the air conditioner is larger than a preset current or not, and if so, entering S5; if not, the air conditioner has no leakage, and the detection program is quitted.
6. The method for detecting refrigerant leakage according to claim 1, wherein S5 includes the steps of:
s501: acquiring real-time intake mass flow and real-time exhaust mass flow measured by a mass flow sensor arranged on the compressor, acquiring outdoor ambient temperature of the air conditioner and indoor ambient temperature of the air conditioner in real time, and entering S502;
s502: acquiring an absolute value Δ m1 of a deviation value between a preset intake mass flow and a preset exhaust mass flow of the compressor corresponding to an outdoor ambient temperature of the air conditioner and an indoor ambient temperature of the air conditioner, and entering S503;
s503: calculating the absolute value Δ m2 of the difference between the real-time intake mass flow and the real-time exhaust mass flow, and entering S504;
s504: calculating according to a formula eta (delta m 1-delta m 2)/(delta m 1) to obtain the mass flow rate reduction percentage eta of the refrigerant;
s505, judging whether the refrigerant mass flow rate reduction percentage eta is greater than a preset refrigerant mass flow rate standard reduction rate X, if so, leading the air conditioner to generate refrigerant leakage, and entering S4; if not, the air conditioner does not have refrigerant leakage, and the process returns to the step S2.
7. A refrigerant leakage detection device, characterized in that, the refrigerant leakage detection method of any one of claims 1 to 6 is adopted, 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.
8. An air conditioner, characterized in that, the air conditioner includes the refrigerant leakage detection device of claim 7.
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| CN111550904B (en) * | 2020-04-13 | 2021-10-15 | 宁波奥克斯电气股份有限公司 | Electronic expansion valve control method and device and air conditioner |
| CN111608901A (en) * | 2020-06-17 | 2020-09-01 | 安徽创米信息技术有限公司 | Fault diagnosis system and fault diagnosis device of compressor |
| CN113465119B (en) * | 2021-06-30 | 2023-05-26 | 青岛海尔空调电子有限公司 | Fire detection control method for air conditioner |
| CN113352844A (en) * | 2021-07-13 | 2021-09-07 | 青岛海信网络能源股份有限公司 | Parking air conditioner and control method thereof |
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