CN110848876A - Refrigerant leakage detection method and system and air conditioner - Google Patents
Refrigerant leakage detection method and system and air conditioner Download PDFInfo
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- CN110848876A CN110848876A CN201810957386.3A CN201810957386A CN110848876A CN 110848876 A CN110848876 A CN 110848876A CN 201810957386 A CN201810957386 A CN 201810957386A CN 110848876 A CN110848876 A CN 110848876A
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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
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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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Abstract
The invention discloses a method and a system for detecting refrigerant leakage and an air conditioner, wherein a fluid sensor monitors impedance between two electrodes in real time, when the impedance between the two electrodes of the fluid sensor exceeds a preset threshold value, the fluid sensor sends an impedance standard exceeding signal to a controller, the controller starts an infrared sensor, the infrared sensor judges whether a refrigerant leaks according to received wavelength data, if so, the controller judges whether the air conditioner is in a starting state, and if so, the controller executes the explosion-proof operation in the starting state; if not, executing shutdown state explosion-proof operation; and determining leakage points of the air conditioner and repairing the air conditioner. The refrigerant leakage detection method, the refrigerant leakage detection system and the air conditioner can find the indoor leaked refrigerant in time, take measures to quickly reduce the concentration of the indoor refrigerant, and avoid the problem that the combustible refrigerant air conditioner can effectively prevent the combustible refrigerant air conditioner from being burnt and even exploding due to the fire spreading of the indoor environment.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a method and a system 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 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. 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 take corresponding explosion-proof measures to avoid explosion caused by refrigerant leakage.
Another objective of the present invention is to provide a refrigerant leakage detection system.
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: the fluid sensor monitors the impedance between the two electrodes in real time, and when the impedance between the two electrodes of the fluid sensor exceeds a preset threshold value, the fluid sensor sends an impedance exceeding signal to the controller, and the step S2 is carried out;
s2: the controller starts an infrared sensor, the infrared sensor judges whether the refrigerant leaks according to the received wavelength data, if so, an alarm device sends an alarm signal, the controller calculates the concentration of the refrigerant in the indoor air, and the step S3 is carried out; if not, returning to S1;
s3: the controller judges whether the air conditioner is in a starting state or not, and if so, the controller executes the explosion-proof operation in the starting state; if not, executing shutdown state explosion-proof operation;
s4: and determining a leakage point of the air conditioner, repairing the air conditioner and returning to the step S1.
Further, the refrigerant in the air conditioner comprises at least two components.
Further, the S2 includes the following steps:
s201: the controller starts the infrared sensor, judges whether the infrared sensor simultaneously receives wavelength data of molecules of all components contained in the refrigerant prestored in the controller, and if so, enters S202;
s202: the controller acquires concentration percentages of all components contained in the refrigerant in the total components of the refrigerant according to the wavelength data received by the infrared sensor;
s203: the controller judges whether the concentration percentages of all components contained in the refrigerant in the total refrigerant components are within the range of the concentration percentages of all components contained in the refrigerant in the total refrigerant components preset by a system, if yes, the refrigerant leaks, and the alarm device sends out an alarm signal to enter S204; if not, the refrigerant does not leak, and the flow returns to S1;
s204: the controller calculates a concentration value of the refrigerant in the air based on the wavelength data received by the infrared sensor, and the process proceeds to S3.
Further, the refrigerant contains a warning additive.
Further, the S2 includes the following steps:
s201: the controller starts the infrared sensor and judges whether the infrared sensor receives the wavelength data of the molecules of the warning additive prestored in the controller, if so, the refrigerant leaks, and the alarm device sends an alarm signal to enter S202; if not, the refrigerant does not leak, and the flow returns to S1;
s202: the controller obtains the concentration value of the warning additive in the indoor air according to the wavelength data of the warning additive, and the step S203 is entered;
s203: the controller calculates a concentration value of the refrigerant in the air according to an initial concentration ratio of the warning additive to the refrigerant, and the process proceeds to S3.
Furthermore, the parent structure of the warning additive is 1, 8-naphthalimide.
Further, the S3 includes the following steps:
s301: judging whether the air conditioner is in a starting state or not, if so, executing the starting state explosion-proof operation of the steps S302-S304; if not, executing the shutdown state explosion-proof operation of the step S305;
s302: judging whether the concentration of the refrigerant in the air exceeds a first preset concentration value, if so, releasing inert gas to the indoor by the air conditioner, judging the current working state of the air conditioner, if refrigeration is performed, closing a first valve on an air inlet pipeline of the compressor, delaying for a first preset time, closing a second valve on an exhaust pipeline of the compressor, and stopping the compressor; if the air conditioner is heating, closing a second valve on an exhaust pipeline of the compressor, delaying for a first preset time, closing a first valve on an air inlet pipeline of the compressor, and stopping the compressor;
s303: judging whether the concentration of the refrigerant in the air exceeds a second preset concentration value, if so, starting a fan in the indoor unit and/or the outdoor unit to run for a first preset time;
s304: judging whether the concentration of the refrigerant in the air is greater than a first preset concentration value and less than a second preset concentration value, if so, controlling the air conditioner to power off after the controller controls the air conditioner to start the refrigerant recovery action;
s305: and starting the outdoor fan to discharge the refrigerant leaked indoors, stopping the outdoor fan after the outdoor fan operates for a second preset time, and controlling the air conditioner to start the refrigerant recovery action by the controller.
The embodiment of the second aspect of the invention discloses a refrigerant leakage detection system, which comprises a controller, a fluid sensor, an infrared sensor and an alarm device, wherein the controller is connected with the fluid sensor, the controller is connected with the infrared sensor, and the controller is connected with the alarm device;
the fluid sensor is arranged on one side of the air conditioner, which is most prone to leakage, the main body of the fluid sensor is provided with two electrodes, the two electrodes are separated from each other, the fluid sensor compares an impedance value between the two electrodes with a preset impedance threshold value prestored in the controller, and if the measured impedance value is larger than the preset impedance threshold value, the fluid sensor sends an impedance standard exceeding signal to the controller;
the infrared sensor is used for measuring wavelength data of molecules of indoor air components and sending the wavelength data to the controller;
the controller is used for controlling the operation of the air conditioner, receiving the information of the fluid sensor and the infrared sensor, judging whether the refrigerant leaks or not, and executing the explosion-proof operation in the shutdown state or the explosion-proof operation in the startup state;
the alarm device is used for sending out an alarm signal.
Further, the fluid sensor further comprises an impedance measuring unit, an impedance judging unit and a signal output unit, wherein the impedance measuring unit can measure the impedance between the two electrodes, the impedance judging unit compares the impedance value measured by the impedance measuring unit with a preset impedance threshold value prestored in the controller to judge whether the measured impedance value is larger than the preset impedance threshold value, and if so, the signal output unit sends an impedance standard exceeding signal to the controller.
The embodiment of the third aspect of the invention discloses an air conditioner, which comprises a refrigerant leakage detection system.
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 system and the air conditioner, whether the refrigerant leaks or not can be accurately determined by using the fluid sensor and the infrared sensor;
(2) according to the method, the system and the air conditioner, after the leakage of the refrigerant is determined, different explosion-proof operations can be adopted according to the starting or shutdown conditions of the air conditioner, so that the danger of electric sparks caused by the action of recovering the refrigerant during starting is avoided;
(3) according to the method, the system and the air conditioner, different explosion-proof operations are adopted according to different concentration values of the indoor refrigerant, so that the concentration of the leaked flammable refrigerant can be reduced as soon as possible in high concentration, and the safety of using the flammable refrigerant air conditioner is improved;
(4) the method, the system and the air conditioner adopt the warning refrigerant, have special smell, obviously distinguish the smell of common substances in the surrounding environment, have high olfactory discrimination, can be obviously perceived even if the leakage is diluted by 100 times in the air, and have obvious warning effect of preventing the leakage; the most sensitive yellow-green fluorescence of human can be observed by naked eyes without professional instruments, and the observation is convenient.
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 illustrates a method for detecting refrigerant leakage according to an embodiment of the present invention;
fig. 2 is a refrigerant leakage detection system 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-fluid sensor, 3-infrared sensor, 4-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. 2, the refrigerant leakage detection system includes a controller 1, a fluid sensor 2, an infrared sensor 3, and an alarm device 4, where the controller 1 is connected to the fluid sensor 2, the controller 1 is connected to the infrared sensor 3, and the controller 1 is connected to the alarm device 4.
The fluid sensor 2 is disposed on the side of the air conditioner where leakage is most likely to occur, the body of the fluid sensor 2 has two electrodes spaced apart from each other, the fluid sensor 2 compares an impedance value between the two electrodes with a predetermined threshold value of impedance prestored in the controller 1, and if the measured impedance value is greater than the predetermined threshold value of impedance, the fluid sensor 2 transmits an impedance exceeding signal to the controller 1.
Specifically, the fluid sensor 2 further includes an impedance measuring unit, an impedance judging unit, and a signal output unit, where the impedance measuring unit can measure the impedance between the two electrodes, the impedance judging unit compares the impedance value measured by the impedance measuring unit with a predetermined impedance threshold value pre-stored in the controller 1, and judges whether the measured impedance value is greater than the predetermined impedance threshold value, and if so, the signal output unit sends the impedance exceeding signal to the controller 1.
The infrared sensor 3 is capable of measuring wavelength data of molecules of each component contained in the refrigerant and transmitting the wavelength data to the controller 1.
Specifically, when the refrigerant includes two or more components, the infrared sensor 3 measures wavelength data of all the components; when the warning additive is added to the refrigerant, the infrared sensor 3 may measure only the wavelength data of the warning additive.
The controller 1 is used for controlling the operation of the air conditioner, receiving the information of the fluid sensor 2 and the infrared sensor 3, judging whether the refrigerant leaks, and executing explosion-proof operation in a shutdown state or a startup state.
The alarm device 4 can issue an alarm signal when the controller 1 determines that the refrigerant leaks.
Example 2:
as shown in fig. 1, a method for detecting refrigerant leakage includes the following steps:
s1: the fluid sensor monitors the impedance between the two electrodes in real time, and when the impedance between the two electrodes of the fluid sensor exceeds a preset threshold value, the fluid sensor sends an impedance exceeding signal to the controller, and the step S2 is carried out;
specifically, the impedance measuring unit may measure impedance between the two electrodes, when the refrigerant leaks, the impedance determining unit may compare an impedance value measured by the impedance measuring unit with a predetermined impedance threshold pre-stored in the controller 1, determine whether an actually measured impedance value is greater than the predetermined impedance threshold, when the actually measured impedance value exceeds the predetermined impedance threshold, the impedance reaches a certain set value, the impedance determining unit determines that the refrigerant leaks, the signal output unit sends the impedance exceeding signal to the controller 1, and the controller 1 receives the refrigerant leakage signal and controls the air conditioner to enter a next operation.
S2: the controller starts an infrared sensor, the infrared sensor judges whether the refrigerant leaks according to the received wavelength data, if so, an alarm device sends an alarm signal, the controller calculates the concentration of the refrigerant in the indoor air, and the step S3 is carried out; if not, returning to S1;
specifically, when the refrigerant in the air conditioner includes at least two components, the S2 includes the following steps:
s201: the controller starts the infrared sensor, judges whether the infrared sensor simultaneously receives wavelength data of molecules of all components contained in the refrigerant prestored in the controller, and if so, enters S202;
s202: the controller acquires concentration percentages of all components contained in the refrigerant in the total components of the refrigerant according to the wavelength data received by the infrared sensor;
s203: the controller judges whether the concentration percentages of all components contained in the refrigerant in the total refrigerant components are within the range of the concentration percentages of all components contained in the refrigerant in the total refrigerant components preset by a system, if yes, the refrigerant leaks, and the alarm device sends out an alarm signal to enter S204; if not, the refrigerant does not leak, and the flow returns to S1;
s204: the controller calculates a concentration value of the refrigerant in the air based on the wavelength data received by the infrared sensor, and the process proceeds to S3.
Specifically, when the refrigerant in the air conditioner comprises at least two components, whether the refrigerant leaks is judged by taking wavelength data of molecules of the components contained in the refrigerant, which is received by the infrared sensor 3 and prestored in the controller 1, as a standard, so that the phenomenon of false alarm when some component in the refrigerant is released by other indoor objects except the air conditioner can be avoided, and the probability of false alarm is reduced.
Specifically, when the refrigerant includes a warning additive, the S2 includes the steps of:
s201: the controller starts the infrared sensor and judges whether the infrared sensor receives the wavelength data of the molecules of the warning additive prestored in the controller, if so, the refrigerant leaks, and the alarm device sends an alarm signal to enter S202; if not, the refrigerant does not leak, and the flow returns to S1;
s202: the controller obtains the concentration value of the warning additive in the indoor air according to the wavelength data of the warning additive, and the step S203 is entered;
s203: the controller calculates a concentration value of the refrigerant in the air according to an initial concentration ratio of the warning additive to the refrigerant, and the process proceeds to S3.
Specifically, the parent structure of the warning additive is 1, 8-naphthalimide. The warning additive has the advantages that the system components of the warning additive do not change obviously under the constant temperature condition of 100 ℃ and 360-day accelerated aging test, the warning additive still has obvious functional characteristics, can meet the requirement of long-term recycling, has good compatibility with (copper, iron or aluminum materials) pipelines, does not generate corrosivity, and is beneficial to long-term use of refrigeration equipment.
Specifically, a small amount of warning additive is dissolved in the refrigerator oil and enters the refrigerating system together. The additive is dissolved in the refrigerator oil and enters the refrigerating system, rather than being premixed with the hydrocarbon refrigerant and then refilled, thereby avoiding the defect that the product performance of each batch is different due to the density difference of the components. In the running process of the refrigeration equipment, the refrigerant is mixed into a homogeneous phase, and the normal running of a refrigeration system is not influenced. When the system leaks, the additive has obvious peculiar smell and can play a role in warning; the peak value of the absorption wavelength of the additive is 320-475 nm, so that the energy required by fluorescence generation can be obtained from natural light; the emission wavelength is 450-650 nm, and the most sensitive yellow green fluorescence of human can be emitted, so that the observation is convenient. Therefore, if leakage exists, the leakage position can be directly observed by naked eyes; meanwhile, under dangerous environments (such as electric sparks, open flames and the like), the additive can be decomposed to generate a large number of inhibitor free radicals (CF2, NH2), and the inhibitor free radicals collide with activated radicals (CH3, OH, HCO and the like) generated by hydrocarbon refrigerants to remove activated free radicals required by explosion reaction, so that the explosion suppression effect is achieved.
S301: judging whether the air conditioner is in a starting state or not, if so, executing the starting state explosion-proof operation of the steps S302-S304; if not, executing the shutdown state explosion-proof operation of the step S305;
s302: judging whether the concentration of the refrigerant in the air exceeds a first preset concentration value, if so, releasing inert gas to the indoor by the air conditioner, judging the current working state of the air conditioner, if refrigeration is performed, closing a first valve on an air inlet pipeline of the compressor, delaying for a first preset time, closing a second valve on an exhaust pipeline of the compressor, and stopping the compressor; if the air conditioner is heating, closing a second valve on an exhaust pipeline of the compressor, delaying for a first preset time, closing a first valve on an air inlet pipeline of the compressor, and stopping the compressor.
Specifically, the inert gas is released to the indoor unit or the outdoor unit, the gas pipeline and the liquid pipeline between the indoor unit and the outdoor unit are closed, and the compressor is controlled to stop, so that when the refrigerant in the indoor unit or the outdoor unit leaks, the concentration of the leaked flammable refrigerant can be effectively reduced, the probability of ignition and explosion is reduced, and the safety of using the flammable refrigerant air conditioner is effectively improved. Wherein the inert gas includes, but is not limited to: and flame-retardant gases such as carbon dioxide and nitrogen.
Specifically, if the working mode is the cooling mode, the shutdown method includes: the compressor keeps running, a first valve on an air inlet pipeline of the compressor is closed, the time delay is waited for the preset time, the refrigerant is recycled to one side of the air conditioner outdoor unit, a second valve on a gas exhaust pipeline of the compressor is closed, the running of the compressor is stopped, and the running of the outer unit fan is stopped (or the running of the outer unit fan 21 is not stopped). The compressor does not contain refrigerant, and even if a very small amount of thin gaseous refrigerant is left, the explosion danger does not occur.
Specifically, if the working mode is the cooling mode, the shutdown method includes: the compressor keeps running, the second valve 50 on the exhaust pipeline of the compressor is closed, the time delay is waited for the preset time, the first valve on the air inlet pipeline of the compressor is closed, the running of the compressor is stopped, and the running of the outer machine fan 21 is stopped (or the running of the outer machine fan is not stopped).
S303: and judging whether the concentration of the refrigerant in the air exceeds a second preset concentration value, if so, starting a fan in the indoor unit and/or the outdoor unit to run for a first preset time.
Specifically, the fan in the indoor unit and/or the outdoor unit is started to ventilate, so that the concentration of the leaked flammable refrigerant can be reduced as soon as possible, and the safety of using the flammable refrigerant air conditioner is improved.
S304: and judging whether the concentration of the refrigerant in the air is greater than a first preset concentration value and less than a second preset concentration value, if so, controlling the air conditioner to power off after the controller 1 controls the air conditioner to start the refrigerant recovery action. By controlling the air conditioner to be powered off, the phenomenon that the air conditioner continues to work to aggravate leakage of the refrigerant can be avoided.
S305: and starting an outdoor fan, discharging the refrigerant leaked indoors, stopping the outdoor fan after the outdoor fan operates for a second preset time, and controlling the air conditioner to start the refrigerant recovery action by the controller 1.
Specifically, when the environmental conditions are abnormal, the refrigerant recovery action is executed, and the refrigerant can be better prevented from being continuously supplemented to the indoor unit, so that the danger of combustion and even explosion of the air conditioner due to the influence of fire spreading around the indoor unit can be more effectively avoided.
Specifically, the refrigerant is recovered, the air conditioning system must be in a power-on state, if the concentration of the refrigerant leaked indoors in a power-off state reaches a dangerous edge, at the moment, the danger of electric sparks is generated when the air conditioning system is started to recover, so that the outdoor fan is started to operate for the second preset time, the indoor fan is kept to stop working, the refrigerant is recovered after the concentration of the indoor refrigerant is reduced, and explosion is not easily generated.
S4: and determining a leakage point of the air conditioner, repairing the air conditioner and returning to the step S1.
Specifically, when the warning additive is added into the refrigerant, the emission wavelength of the warning additive is 450-650 nm, the most sensitive yellow-green fluorescence of human can be emitted, observation is facilitated, and leakage parts can be effectively confirmed.
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: the fluid sensor monitors the impedance between the two electrodes in real time, and when the impedance between the two electrodes of the fluid sensor exceeds a preset threshold value, the fluid sensor sends an impedance exceeding signal to the controller, and the step S2 is carried out;
s2: the controller starts an infrared sensor, the infrared sensor judges whether the refrigerant leaks according to the received wavelength data, if so, an alarm device sends an alarm signal, the controller calculates the concentration of the refrigerant in the indoor air, and the step S3 is carried out; if not, returning to S1;
s3: the controller judges whether the air conditioner is in a starting state or not, and if so, the controller executes the explosion-proof operation in the starting state; if not, executing shutdown state explosion-proof operation;
s4: and determining a leakage point of the air conditioner, repairing the air conditioner and returning to the step S1.
2. The method of claim 1, wherein the refrigerant in the air conditioner comprises at least two components.
3. The refrigerant leakage detection method according to claim 2, wherein the S2 includes:
s201: the controller starts the infrared sensor, judges whether the infrared sensor simultaneously receives wavelength data of molecules of all components contained in the refrigerant prestored in the controller, and if so, enters S202;
s202: the controller acquires concentration percentages of all components contained in the refrigerant in the total components of the refrigerant according to the wavelength data received by the infrared sensor;
s203: the controller judges whether the concentration percentages of all components contained in the refrigerant in the total refrigerant components are within the range of the concentration percentages of all components contained in the refrigerant in the total refrigerant components preset by a system, if yes, the refrigerant leaks, and the alarm device sends out an alarm signal to enter S204; if not, the refrigerant does not leak, and the flow returns to S1;
s204: the controller calculates a concentration value of the refrigerant in the air based on the wavelength data received by the infrared sensor, and the process proceeds to S3.
4. The refrigerant leakage detection method according to claim 1, wherein the refrigerant contains a warning additive.
5. The refrigerant leakage detection method as claimed in claim 4, wherein the S2 includes the steps of:
s201: the controller starts the infrared sensor and judges whether the infrared sensor receives the wavelength data of the molecules of the warning additive prestored in the controller, if so, the refrigerant leaks, and the alarm device sends an alarm signal to enter S202; if not, the refrigerant does not leak, and the flow returns to S1;
s202: the controller obtains the concentration value of the warning additive in the indoor air according to the wavelength data of the warning additive, and the step S203 is entered;
s203: the controller calculates a concentration value of the refrigerant in the air according to an initial concentration ratio of the warning additive to the refrigerant, and the process proceeds to S3.
6. The method of claim 4, wherein the matrix structure of the warning additive is 1, 8-naphthalimide.
7. The refrigerant leakage detection method according to claim 1, wherein the S3 includes:
s301: judging whether the air conditioner is in a starting state or not, if so, executing the starting state explosion-proof operation of the steps S302-S304; if not, executing the shutdown state explosion-proof operation of the step S305;
s302: judging whether the concentration of the refrigerant in the air exceeds a first preset concentration value, if so, releasing inert gas to the indoor by the air conditioner, judging the current working state of the air conditioner, if refrigeration is performed, closing a first valve on an air inlet pipeline of the compressor, delaying for a first preset time, closing a second valve on an exhaust pipeline of the compressor, and stopping the compressor; if the air conditioner is heating, closing a second valve on an exhaust pipeline of the compressor, delaying for a first preset time, closing a first valve on an air inlet pipeline of the compressor, and stopping the compressor;
s303: judging whether the concentration of the refrigerant in the air exceeds a second preset concentration value, if so, starting a fan in the indoor unit and/or the outdoor unit to run for a first preset time;
s304: judging whether the concentration of the refrigerant in the air is greater than a first preset concentration value and less than a second preset concentration value, if so, controlling the air conditioner to power off after the controller controls the air conditioner to start the refrigerant recovery action;
s305: and starting the outdoor fan to discharge the refrigerant leaked indoors, stopping the outdoor fan after the outdoor fan operates for a second preset time, and controlling the air conditioner to start the refrigerant recovery action by the controller.
8. The detection system for refrigerant leakage is characterized by comprising a controller, a fluid sensor, an infrared sensor and an alarm device, wherein the controller is connected with the fluid sensor, the controller is connected with the infrared sensor, and the controller is connected with the alarm device;
the fluid sensor is arranged on one side of the air conditioner, which is most prone to leakage, the main body of the fluid sensor is provided with two electrodes, the two electrodes are separated from each other, the fluid sensor compares an impedance value between the two electrodes with a preset impedance threshold value prestored in the controller, and if the measured impedance value is larger than the preset impedance threshold value, the fluid sensor sends an impedance standard exceeding signal to the controller;
the infrared sensor is used for measuring wavelength data of molecules of indoor air components and sending the wavelength data to the controller;
the controller is used for controlling the operation of the air conditioner, receiving the information of the fluid sensor and the infrared sensor, judging whether the refrigerant leaks or not, and executing the explosion-proof operation in the shutdown state or the explosion-proof operation in the startup state;
the alarm device is used for sending out an alarm signal.
9. The refrigerant leakage detection system according to claim 8, wherein the fluid sensor further includes an impedance measurement unit, an impedance determination unit, and a signal output unit, the impedance measurement unit is capable of measuring an impedance between the two electrodes, the impedance determination unit compares an impedance value measured by the impedance measurement unit with a predetermined impedance threshold value pre-stored in the controller, and determines whether an actually measured impedance value is greater than the predetermined impedance threshold value, and if so, the signal output unit sends an impedance exceeding signal to the controller.
10. An air conditioner characterized in that the air conditioner comprises the refrigerant leakage detection system according to any one of claims 8 and 9.
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