CN112611517A - Device and method for detecting leakage of refrigerant of automobile air conditioning system - Google Patents
Device and method for detecting leakage of refrigerant of automobile air conditioning system Download PDFInfo
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Abstract
本发明提供了一种检测汽车空调系统制冷剂泄漏的装置及方法，一种检测汽车空调系统制冷剂泄漏的装置，包括环境舱室、用于控制环境舱室温度的温控系统、用于控制环境舱室内气体平衡的气体平衡装置、以及用于环境舱室的制冷剂分析装置；所述温控系统安装在环境舱室内，所述环境舱室上设有进气口，所述气体平衡装置与进气口连接，所述环境舱室设有采样口、回样口，所述制冷剂分析装置一端与采样口连接，另一端与回样口连接。本发明所述的制冷剂泄漏检测的方法及装置，能够全面、科学地分析整个空调系统的泄漏率，有利于企业对汽车空调泄漏水平进行摸底及整改。
The invention provides a device and method for detecting refrigerant leakage of an automobile air conditioning system, a device for detecting refrigerant leakage of an automobile air conditioning system, comprising an environmental compartment, a temperature control system for controlling the temperature of the environmental compartment, and a temperature control system for controlling the temperature of the environmental compartment. A gas balance device for indoor gas balance, and a refrigerant analysis device for an environmental chamber; the temperature control system is installed in the environmental chamber, and an air inlet is provided on the environmental chamber, and the gas balance device is connected to the air inlet The environmental compartment is provided with a sampling port and a sample return port, one end of the refrigerant analysis device is connected with the sampling port, and the other end is connected with the return sample port. The method and device for detecting refrigerant leakage in the present invention can comprehensively and scientifically analyze the leakage rate of the entire air conditioning system, which is beneficial for enterprises to thoroughly investigate and rectify the leakage level of automobile air conditioning.
Description
Technical Field
The invention belongs to the technical field of automobile air conditioner testing, and particularly relates to a device and a method for detecting refrigerant leakage of an automobile air conditioner system.
Background
At present, an air conditioning system becomes an important component of an automobile, and due to design, material selection and assembly differences in the development and production stages of the air conditioning system, a refrigerant can leak to different degrees through a connector, a hose and other parts in the operation process, so that the refrigeration and heating performance of the air conditioning system is reduced. Moreover, the automobile air-conditioning refrigerant has higher Global Warming Potential (GWP), and the leakage of the automobile air-conditioning refrigerant can increase the global warming degree. It is necessary to evaluate the leakage rate of the air conditioning system in the operation stage in the research and development design stage and take measures to improve the sealing level of the automobile air conditioner.
However, the current method for detecting the leakage rate of the automobile air conditioner is generally vacuum helium detection of a single part, and is difficult to represent the leakage level of the whole system under real working media and real environment. Therefore, a detection method capable of accurately evaluating the leakage of the refrigerant of the automobile air conditioner is proposed, which is a problem to be solved urgently.
Disclosure of Invention
In view of the above, the present invention is directed to a device and a method for detecting refrigerant leakage of an air conditioning system of an automobile, so as to solve the problem of evaluating the leakage rate of the air conditioning system in an operation stage in a research and design stage.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a device for detecting the refrigerant leakage of an automobile air conditioning system comprises an environment cabin, a temperature control system for controlling the temperature of the environment cabin, a gas balance device for controlling the gas balance in the environment cabin and a refrigerant analysis device for the environment cabin;
the temperature control system is installed in the environment cabin, be equipped with the air inlet on the environment cabin, gaseous balancing unit is connected with the air inlet, the environment cabin is equipped with the sample connection, returns the appearance mouth, refrigerant analytical equipment one end is connected with the sample connection, and the other end is connected with returning the appearance mouth.
Furthermore, the temperature control system is electrically connected with a system controller, the temperature control system comprises a temperature sensor, the temperature sensor is electrically connected with heating equipment and an electronic refrigerating sheet, and the other end of the temperature sensor is electrically connected with the system controller;
the temperature control system further comprises a mixing fan and a driving wheel, the mixing fan is connected with a first electric motor, the driving wheel is connected with a second electric motor, and the first electric motor and the second electric motor are electrically connected with a system controller.
Further, the gas balancing device comprises a regenerated air source and an air pressure adjusting bag connected with the regenerated air source, wherein the air outlet end of the regenerated air source is connected with the air inlet end of the air pressure adjusting bag, and the air outlet end of the air pressure adjusting bag is connected with the air inlet of the environment cabin;
a first switch valve and a first flow meter are connected between the regenerative air source and the air pressure regulating bag, one end of the first switch valve is connected with one end of the regenerative air source, the other end of the first switch valve is connected with one end of the first flow meter, and the other end of the first flow meter is connected with the air inlet end of the air pressure regulating bag;
the air pressure adjusting bag is characterized in that a second switch valve is connected between the air pressure adjusting bag and the environment cabin, one end of the second switch valve is connected with an air outlet end of the air pressure adjusting bag, and the other end of the second switch valve is connected with an air inlet of the environment cabin.
Further, the refrigerant analysis device comprises a refrigerant analyzer, the refrigerant analyzer comprises a sample inlet and a sample outlet, the sample inlet of the refrigerant analyzer is connected with the sample inlet of the environment chamber, and the sample outlet of the refrigerant analyzer is connected with the sample return port of the environment chamber;
a sample pump, a third switch valve and a second flow meter are arranged between a sample inlet of the refrigerant analyzer and a sample inlet of the environment cabin, one end of the sample pump is connected with the sample inlet of the refrigerant analyzer, the other end of the sample pump is connected with one end of the second flow meter, the other end of the second flow meter is connected with one end of the third switch valve, and the other end of the third switch valve is connected with the sample inlet of the environment cabin;
and a fourth switch valve is arranged between the sample outlet of the refrigerant analyzer and the sample return port of the environmental chamber.
Further, install outside ventilation unit on the environment cabin, outside ventilation unit includes pipeline, ventilation fan, in pipeline one end extended to the environment cabin, the other end was connected with ventilation fan, install No. five ooff valves on the pipeline.
A method of detecting refrigerant leakage in an automotive air conditioning system, comprising the steps of:
s1, assembling an automobile air conditioning system in the environmental cabin, vacuumizing the air conditioning system and filling rated amount of refrigerant;
s2, setting the pre-processing temperature by using the system controller, and pre-processing the air conditioning system at the set temperature;
s3, after pretreatment, adjusting the environment in the environment cabin, performing leakage detection, and recording the environment value in the environment cabin in the detection process;
and S4, calculating the leakage rate by using the recorded environmental value.
Further, the temperature procedure of the pre-processing set in the step S2 is as follows:
201. assembling an automobile air conditioning system in the environmental cabin, vacuumizing the air conditioning system and filling a rated amount of refrigerant;
202. setting a temperature parameter of pretreatment by using a system controller, starting a mixing fan, and placing an air conditioning system into an environment chamber;
203. closing the hatch and closing the valves.
Further, the process of adjusting the environment in the environment chamber by the leak detection in step S3 is as follows:
204. after the pretreatment time is reached based on the step 201 and the step 203, the mixing fan is closed, the first switch valve, the second switch valve, the switch valve and the regeneration air source are opened, clean air is filled into the environmental chamber, and the air in the environmental chamber is cleaned and replaced;
205. opening a fourth switch valve, a sample injection pump and a refrigerant analyzer, and monitoring the concentration of the refrigerant in the environmental chamber;
206. when the concentration of the refrigerant in the environment chamber is stabilized at the environment level, the second switch valve is closed, so that a certain amount of regenerated air is stored in the air pressure adjusting bag;
207. the regenerated air source, the switch valve and the fifth switch valve are closed, and the second switch valve is opened, so that the air pressure adjusting bag can adjust the air pressure in the environmental chamber;
208. and setting a detection temperature parameter by using a system controller, starting a mixing fan, and starting to record an environmental value in the environmental chamber displayed by the system controller and the refrigerant analyzer when the temperature in the environmental chamber is stable.
Further, the environment values are: temperature in the ambient compartment, pressure in the ambient compartment, initial concentration and final concentration of the refrigerant.
Further, the leak rate is calculated by the following formula:
wherein Q is the leakage rate [ kg/s ] of the refrigerant of the air conditioning system;
MrefrigerantIs the molar mass [ kg/mol ] of the refrigerant]；
VCabinIs the volume [ m ] of the environmental chamber]；
VAir conditionerIs the volume [ m ] of the air conditioning system]；
PCabinIs the pressure in the ambient chamber [ kpa ]]；
TCabinFor ambient cabin temperature [ K ]]；
R is the gas constant [ kJ/(kmol × K) ];
Crefrigerant iIs the initial concentration [ ppm ] of refrigerant in the environmental chamberv]；
CRefrigerant eIs the final concentration [ ppm ] of the refrigerant in the environmental chamberv]；
tiAnd teTime of starting detection and end of detection [ s ], respectively]。
Compared with the prior art, the device and the method for detecting the refrigerant leakage of the automobile air conditioning system have the following advantages that:
(1) the method and the device for detecting the refrigerant leakage of the whole system of the automobile air conditioner in the simulated environment can comprehensively and scientifically analyze the leakage rate of the whole air conditioner system, and are favorable for enterprises to make an end to touch and modify the leakage level of the automobile air conditioner.
(2) The method for preprocessing the leakage rate of the refrigerant of the automobile air conditioner can preprocess the automobile air conditioning system, so that the leakage rate of the refrigerant of the automobile air conditioner is balanced, and the reliability of leakage rate detection is improved.
(3) The automobile air conditioner detection device can provide a programmed temperature change environment, provides a stable simulation environment for testing, and improves the authenticity of a test result.
(4) The gas balancing device can dynamically supplement gas or contain redundant gas to the environment chamber when the volume of the gas in the environment chamber changes due to temperature, so that the chamber body is prevented from leaking due to the change of the gas pressure, and the accuracy of a detection result is improved.
(5) The external circulation fan can be matched with the gas balance device to wash the detection chamber, and the circulation fan and the gas balance device are started to wash and purify the residual refrigerant and other polluted gas in the cabin before detection, so that the detection precision is improved.
(6) The refrigerant analysis device and the environmental chamber form a gas circulation passage, so that the gas volume in the environmental chamber is not lost during detection, and the detection accuracy is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of an apparatus for detecting refrigerant leakage in an air conditioning system of a vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for detecting refrigerant leakage of an air conditioning system of a vehicle according to an embodiment of the present invention.
Description of reference numerals:
1. an environmental chamber; 2. a sampling port; 3. returning a sample port; 4. a pipeline; 5. a ventilation fan; 6. a cabin door; 7. a heating device; 8. an electronic refrigeration sheet; 9. a mixing fan; 10. an electric motor; 11. an air pressure adjusting bag; 12. an air inlet; 13. a source of regenerated air; 14. a first switch valve; 15. a first flowmeter; 16. a second switch valve; 17. a refrigerant analyzer; 18. a sample inlet; 19. a sample outlet; 20. A third switch valve; 21. a fourth switch valve; 22. a second flowmeter; 23. a temperature sensor; 24. a pressure sensor; 25. a system controller; 26. a driving wheel; 27. a second electric motor; 28. a fifth switch valve; 29. and a sample feeding pump.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a device for detecting refrigerant leakage of an automotive air conditioning system comprises an environmental chamber 1, a temperature control system for controlling the temperature of the environmental chamber 1, a gas balance device for controlling the gas balance in the environmental chamber 1, and a refrigerant analysis device for the environmental chamber 1;
temperature control system installs in environment cabin 1, be equipped with air inlet 12 on the environment cabin 1, gaseous balancing unit is connected with air inlet 12, environment cabin 1 is equipped with sampling port 2, returns appearance mouth 3, refrigerant analytical equipment one end is connected with sampling port 2, and the other end is connected with returning appearance mouth 3.
The temperature control system is electrically connected with a system controller 25 and comprises a temperature sensor 23, the temperature sensor 23 is electrically connected with a heating device 7 and an electronic refrigerating sheet 8, and the other end of the temperature sensor 23 is electrically connected with the system controller 25;
the temperature control system further comprises a mixing fan 9 and a driving wheel 26, the mixing fan 9 is connected with a first electric motor 10, the driving wheel 26 is connected with a second electric motor 27, and the first electric motor 10 and the second electric motor 27 are electrically connected with the system controller 25.
The gas balancing device comprises a regenerated air source 13 and an air pressure adjusting bag 11 connected with the regenerated air source 13, wherein the air outlet end of the regenerated air source 13 is connected with the air inlet end of the air pressure adjusting bag 11, and the air outlet end of the air pressure adjusting bag 11 is connected with the air inlet 12 of the environment cabin 1;
a first switch valve 14 and a first flow meter 15 are connected between the regeneration air source 13 and the air pressure adjusting bag 11, one end of the first switch valve 14 is connected with one end of the regeneration air source 13, the other end of the first switch valve 14 is connected with one end of the first flow meter 15, and the other end of the first flow meter 15 is connected with the air inlet end of the air pressure adjusting bag 11;
a second switch valve 16 is connected between the air pressure adjusting bag 11 and the environment cabin 1, one end of the second switch valve 16 is connected with an air outlet end of the air pressure adjusting bag 11, and the other end of the second switch valve is connected with an air inlet 12 of the environment cabin 1.
The refrigerant analysis device comprises a refrigerant analyzer 17, the refrigerant analyzer 17 comprises a sample inlet 18 and a sample outlet 19, the sample inlet 18 of the refrigerant analyzer 17 is connected with the sample inlet 2 of the environmental chamber 1, and the sample outlet 19 of the refrigerant analyzer 17 is connected with the sample return port 3 of the environmental chamber 1;
a sample pump 29, a third switch valve 20 and a second flow device 22 are arranged between the sample inlet 18 of the refrigerant analyzer 17 and the sample inlet 2 of the environment chamber 1, one end of the sample pump 29 is connected with the sample inlet 18 of the refrigerant analyzer 17, the other end of the sample pump 29 is connected with one end of the second flow device 22, the other end of the second flow device is connected with one end of the third switch valve 20, and the other end of the third switch valve 20 is connected with the sample inlet 2 of the environment chamber 1;
a four-way switch valve 21 is installed between the sample outlet 19 of the refrigerant analyzer 17 and the sample return port 3 of the environmental chamber 1.
Install outside ventilation unit on the environment cabin 1, outside ventilation unit includes pipeline 4, ventilation fan 5, in pipeline 4 one end extended to environment cabin 1, the other end was connected with ventilation fan 5, install No. five ooff valves 28 on the pipeline 4.
Refrigerant leakage detection device of vehicle air conditioning system, including providing the environment cabin 1 of stable test temperature, pressure environment, be equipped with at least one sample connection 2 and one back appearance mouth 3 on the environment cabin 1, environment cabin 1 is connected with and is used for supplementing the gaseous balancing unit of clean air to environment cabin 1 in, still including setting up at the outside refrigerant analytical equipment of environment cavity 1, outside ventilation unit and system control device.
Wherein, be equipped with hatch door 6 on the environment cabin 1, environment cabin 1 is airtight state, and the outer wall in environment cabin or inside are provided with equipment such as firing equipment 7, electron refrigeration piece 8, temperature sensor 23, pressure sensor 24. A mixing fan 9 is arranged in the environment chamber 1, and the mixing fan 9 is in transmission connection with a first electric motor 10 arranged outside the environment chamber 1. The driving wheel 26 is arranged in the environment chamber 1, and the driving wheel 26 is in transmission connection with a second electric motor 27 arranged outside the environment chamber 1.
As shown in fig. 1, the system control device of the present invention includes a system controller 25, the monitoring data of the temperature sensor 23 is fed back to the system controller 25 in real time, the heating device 7 or the electronic cooling plate 8 is started in real time to heat or cool the air in the environmental chamber, and the mixing fan 9 uniformly mixes the air in the environmental chamber 1, so as to control the temperature of the air in the environmental chamber 1.
As shown in fig. 1, the gas balance device of the present invention comprises a pressure regulating bag 11, wherein the air inlet end of the pressure regulating bag 11 is connected to a gas supply device, the air outlet end of the pressure regulating bag 11 is connected to the air inlet 12 of the environmental chamber 1, and the pressure regulating bag 11 maintains the stability of the internal pressure of the environmental chamber 1 through the volume change within a certain range.
The air supply device comprises a regeneration air source 13, and a first switch valve 14 is connected between the air inlet end of the air pressure adjusting bag 11 and the air outlet end of the regeneration air source 13 and used for controlling the supply of regeneration air.
Further, a second on-off valve 16 is connected between the air pressure adjusting bag 11 and the environmental chamber 1. A first flowmeter 15 is connected between the air pressure adjusting bag 11 and the regeneration air source 13 and used for controlling the flow and the flow rate of air supplied by the air supply device.
As shown in fig. 1, the external ventilation device includes a pipe 4 connected to the environmental chamber 1, a No. 4 five on-off valve 28 mounted on the pipe, and a ventilation fan 5, and the external ventilation device can replace the air inside the environmental chamber 1 to reduce the concentration of the refrigerant.
As shown in fig. 1, the refrigerant analyzer includes a refrigerant analyzer 17, a sample inlet 18 of the refrigerant analyzer 17 is connected to the sample inlet 2 of the environmental chamber 1, a sample outlet 19 of the refrigerant analyzer 17 is connected to the sample return 3 of the environmental chamber 1, and the refrigerant analyzer 17 can continuously monitor and record the concentration of the refrigerant in the environmental chamber 1.
A fourth on-off valve 21 is connected between the sample outlet 19 of the refrigerant analyzer 17 and the return port 3 of the environmental chamber 1. A sample pump 29, a third switch valve 20 and a second flow device 22 are connected between the sample inlet 18 of the refrigerant analyzer 17 and the sample inlet 2 of the environmental chamber 1, and the flow direction and the flow rate of the gas entering the refrigerant analyzer 17 are controlled.
As shown in fig. 1 to 2, a method for detecting refrigerant leakage of an air conditioning system of a vehicle includes the steps of:
s1, assembling an automobile air conditioning system in the environmental cabin, vacuumizing the air conditioning system and filling rated amount of refrigerant;
s2, setting the pre-processing temperature by using the system controller, and pre-processing the air conditioning system at the set temperature;
s3, after pretreatment, adjusting the environment in the environment cabin, performing leakage detection, and recording the environment value in the environment cabin in the detection process;
and S4, calculating the leakage rate by using the recorded environmental value.
The temperature process of the pre-processing set in step S2 is as follows:
201. assembling an automobile air conditioning system in the environmental chamber 1, vacuumizing the air conditioning system and filling rated amount of refrigerant;
202. setting the temperature parameters of the pre-treatment, starting the mixing fan 9, and placing the air conditioning system inside the environmental chamber 1 using the system controller 25;
203. the hatch 6 is closed and the valves are closed.
The process of adjusting the environment in the environment cabin by the leak detection in the step S3 is as follows:
204. after the pretreatment time is reached based on the step 201-;
205. opening a fourth switch valve 21, a sample injection pump 29 and a refrigerant analyzer 17, and monitoring the concentration of the refrigerant in the environmental chamber 1;
206. when the concentration of the refrigerant in the environment chamber 1 is stabilized at the environment level, the second switch valve 16 is closed, so that a certain amount of regeneration air is stored in the air pressure adjusting bag 11;
207. the regeneration air source 13, the switch valve 14 and the fifth switch valve 28 are closed, and the second switch valve 16 is opened, so that the air pressure adjusting bag 11 can adjust the air pressure in the environmental chamber;
208. the system controller 25 is used to set the detected temperature parameters, the mixing fan 9 is turned on, and when the temperature in the environmental chamber 1 is stable, the system controller 25 and the refrigerant analyzer 17 begin to record the environmental values in the environmental chamber.
The environment values are: temperature in the ambient compartment, pressure in the ambient compartment, initial concentration and final concentration of the refrigerant.
The leak rate is calculated by the following formula:
wherein Q is the leakage rate [ kg/s ] of the refrigerant of the air conditioning system;
MrefrigerantIs the molar mass [ kg/mol ] of the refrigerant]；
VCabinIs the volume [ m ] of the environmental chamber3]；
VAir conditionerIs the volume [ m ] of the air conditioning system3]；
PCabinIs the pressure in the ambient chamber [ kpa ]]；
TCabinFor ambient cabin temperature [ K ]]；
R is the gas constant [ kJ/(kmol × K) ];
Crefrigerant iIs the initial concentration [ ppm ] of refrigerant in the environmental chamberv]；
CRefrigerant eIs the final concentration [ ppm ] of the refrigerant in the environmental chamberv]；
tiAnd teTime of starting detection and end of detection [ s ], respectively]。
The detection method comprises three stages of pretreatment, leakage concentration detection and leakage rate calculation, and is further described by combining the accompanying drawing:
and in the preprocessing stage, the air conditioning system is completely assembled, a rated amount of refrigerant is filled, then the air conditioning system is placed in an environmental chamber with preset temperature, and an external motor is utilized to enable an air conditioning compressor to reach a preset rotating speed so as to achieve the purpose of stabilizing the leakage rate of the automobile air conditioner.
In the leakage concentration detection stage, the temperature of the environmental chamber and the rotating speed of an air conditioner compressor are firstly adjusted to preset conditions, and clean air is utilized to flush the concentration of the refrigerant in the environmental chamber to the environmental level. After the temperature of the environment chamber is stabilized, the refrigerant concentration in the environment chamber is measured by an online analyzer and recorded as the initial concentration of the refrigerant, and the refrigerant concentration in the environment chamber is measured at the end of the preset detection time and recorded as the final concentration of the refrigerant.
And in the leakage rate detection stage, according to the recorded temperature, pressure and refrigerant concentration, the volume of the environmental chamber and the volume of the air conditioning system, calculating the test leakage rate of the refrigerant of the air conditioning system by using the following formula:
the method specifically comprises the following steps:
the detection device consists of five parts, namely a closed chamber, a temperature control system, an internal and external circulating fan, a gas balance device and an analyzer.
The closed chamber is provided with a retractable cabin door which can accommodate the air conditioning system and realize the transportation of the air conditioning system, and the material of the inner wall of the chamber does not react with the detected refrigerant.
The cavity is provided with a sampling port, a sample return port, a volume calibration port and a gas inlet, and is used for realizing the extraction and the introduction of sample gas and the supplement of gas in the cavity.
The temperature control system of the environmental chamber has the functions of temperature measurement and regulation, the temperature measurement is realized by the temperature sensor arranged in the chamber, the temperature control is realized by the heating and refrigerating device and the temperature control circuit on the inner wall and the outer part of the chamber, and the temperature control precision is below +/-1 ℃.
The environment cabin is internally provided with an internal and external circulating fan which is in transmission connection with a motor arranged outside the cavity, so that the functions of mixing air in the cavity and replacing air in the cavity can be realized.
The gas balancing device is arranged outside the cavity and comprises a pressure adjusting bag which is used for supplementing stored clean air to the inside of the cavity in the detection process, the air inlet end of the pressure adjusting bag is connected with the air supply cylinder, the air outlet end of the pressure adjusting bag is connected with the air inlet of the environment cabin, the pressure adjusting bag is connected with a switch valve in the middle of the air supply cylinder, a second switch valve is arranged between the pressure adjusting bag and the environment cabin, and a flowmeter is further connected between the air inlet end of the pressure adjusting bag and the air supply cylinder.
The gas analyzer is arranged outside the chamber, a sample inlet and a gas outlet of the analyzer are respectively connected with a sampling port and a sample return port of the closed chamber through pipelines, a three-way switch valve is arranged between the sample inlet of the analyzer and the sampling port of the environmental chamber, and a flow meter is connected between the sample inlet of the analyzer and the sampling port of the environmental chamber.
The detection principle of the analyzer can be a detection method capable of detecting the refrigerant, such as infrared spectroscopy, photoacoustic spectroscopy, gas chromatography, and the like, and the analyzer has continuous and low-concentration detection capability.
The refrigerant leakage detection method for the automobile air conditioning system comprises the following steps:
firstly, assembling an automobile air conditioning system in an environment cabin 1, vacuumizing the air conditioning system, filling rated amount of refrigerant, and then connecting an air conditioning compressor with a driving wheel 26 in a driving way through a driving belt;
secondly, setting a pretreatment temperature parameter by using a system controller 25, starting a mixing fan 9, and placing the air conditioning system into the environment chamber 1;
thirdly, closing the cabin door 6, wherein the switch valve 14, the switch valve 16, the switch valve 21 and the switch valve 28 are in a closed state;
fourthly, after the pretreatment time is reached, the mixing fan 9 is closed, the switch valve 14, the switch valve 16, the switch valve 23 and the regeneration air source 13 are opened, and clean air is filled into the environmental chamber 1;
fifthly, opening the switch valve 21, the sample injection pump 29 and the refrigerant analyzer 17, and monitoring the concentration of the refrigerant in the environmental chamber 1;
sixthly, when the concentration of the refrigerant in the environment chamber 1 is stabilized at the environment level, closing the switch valve 16 to store a certain amount of regeneration air in the air pressure adjusting bag 11;
seventhly, closing the regeneration air source 13, the switch valve 14 and the switch valve 28, and opening the switch valve 16 to enable the air pressure adjusting bag 11 to generate an adjusting effect on the air pressure in the environmental chamber;
eighthly, setting a detection temperature parameter by using the system controller 25, starting the mixing fan 9, starting the electric motor 27 to enable the air-conditioning compressor to maintain a preset rotating speed when the temperature in the environmental chamber 1 is stable, and starting to record temperature, pressure and refrigerant concentration data displayed by the system controller 25 and the refrigerant analyzer 17;
and ninthly, calculating the testing leakage rate of the refrigerant of the air conditioning system by using a formula (201) according to the recorded temperature, pressure and refrigerant concentration, the volume of the environmental chamber 1 and the volume of the air conditioning system after the detection period is finished.
(201Q is the leakage rate [ kg/s ] of the refrigerant of the air conditioning system;
MrefrigerantIs the molar mass [ kg/mol ] of the refrigerant]；
VCabinIs the volume [ m ] of the environmental chamber3]；
VAir conditionerIs the volume [ m ] of the air conditioning system3]；
PCabinIs the pressure in the ambient chamber [ kpa ]]；
TCabinFor ambient cabin temperature [ K ]]；
R is the gas constant [ kJ/(kmol × K) ];
Crefrigerant iIs the initial concentration [ ppm ] of refrigerant in the environmental chamberv]；
CRefrigerant eIs the final concentration [ ppm ] of the refrigerant in the environmental chamberv]；
tiAnd teTime of starting detection and end of detection [ s ], respectively]；
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.
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