CN104792481A - Device and method for detecting leakproofness of oil gas recycling systems of oil tank trucks - Google Patents
Device and method for detecting leakproofness of oil gas recycling systems of oil tank trucks Download PDFInfo
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- CN104792481A CN104792481A CN201510150535.1A CN201510150535A CN104792481A CN 104792481 A CN104792481 A CN 104792481A CN 201510150535 A CN201510150535 A CN 201510150535A CN 104792481 A CN104792481 A CN 104792481A
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Abstract
The invention discloses a device for detecting the leakproofness of oil gas recycling systems of oil tank trucks. The device aims to solve problems of low detection precision, work efficiency and intelligent degree of an existing device for detecting the leakproofness of oil gas recycling systems of oil tank trucks in the prior art. The device comprises a detector and a detecting sleeve. The detector comprises a pressure sensor and a central processing unit, the pressure sensor is used for detecting pressure values of the oil gas recycling systems, the detecting sleeve is of a hollow structure, and a communicating opening which is used for being connected with the oil gas recycling systems is formed in an end of the detecting sleeve; a pressure regulating opening and a detecting opening are formed in the detecting sleeve, the pressure regulating opening is used for being connected with pressure regulating equipment, and the detecting opening is used for being communicated with the pressure sensor. The device has the advantages of simple and reasonable structure, portability and high detection precision, work efficiency and intelligent degree.
Description
Technical field
The present invention relates to a kind of tightness detector, be specifically related to a kind of tightness detector of gas recovery system for oil of tank wagon.
Background technology
The light-end products such as gasoline, diesel oil easily volatilize the multiple harmful oil gas such as benzene,toluene,xylene, ethylbenzene in transport, cargo handling process.And most of refuelling station is based upon the relatively intensive place of the crowds such as urban transportation thoroughfare, therefore oil gas volatilizees in atmosphere and to can not be ignored the health hazard that surrounding population causes.A large amount of volatilizations of oil gas not only cause oil and gas loss and Quality Down, and the oil gas of high concentration is disposed to atmospheric envelope in a large number, and severe contamination atmospheric environment also produces great disaster hidden-trouble.Data show: 1m
3concentration is that the oil gas of 10%-40% is mixed in air and can forms 20m
3damp, can 6700m be polluted
3atmospheric environment.And nearly 3,000,000,000 tons of the Petroleum Equivalent that China consumes every year, if oil product is not reclaimed in transportation, the pollution produced causes significant damage to the ecologic environment of the mankind, security context and health environment.For eliminating safe hidden trouble, curb environmental pollution and reducing energy dissipation, current tank wagon is all configured with the gas recovery system for oil for reclaiming oil gas.
Can normally effectively work in order to ensure gas recovery system for oil, relevant departments can regularly test to gas recovery system for oil, and the leakproofness of gas recovery system for oil is exactly one of them important test item.Needing the leakproofness of gas recovery system for oil to use tank wagon gas recovery system for oil tightness detector.But the tank wagon gas recovery system for oil tightness detector major part used at present adopts mechanical compression table to detect, and during detection, tensimeter often damages because of overvoltage and causes accuracy of detection inadequate; Detection data rely on workman to read tensimeter data and then copy to detection table, and detection efficiency is low, and intelligence degree is low.Therefore set of system, intelligence, equipment that is perfect, that be exclusively used in tank wagon gas recovery system for oil leakproofness Performance Detection is badly in need of at present.
Summary of the invention
For solving the accuracy of detection of tank wagon gas recovery system for oil tightness detector in prior art, work efficiency, problem that intelligence degree is all lower, the invention discloses a kind of tank wagon gas recovery system for oil tightness detector.It is simple and reasonable, is easy to carry; Accuracy of detection, work efficiency, intelligence degree are all higher; Also disclose a kind of method utilizing above-mentioned tank wagon gas recovery system for oil tightness detector to detect gas recovery system for oil leakproofness, whether the leakproofness that employing said method can detect gas recovery system for oil is rapidly qualified simultaneously.
In order to achieve the above object, following technical scheme is adopted:
A kind of tank wagon gas recovery system for oil tightness detector, comprise detector and detect sleeve, described detector comprises pressure transducer for detecting gas recovery system for oil force value and central processing unit, and described detection sleeve is hollow structure and one end is provided with connected entrance for connecting gas recovery system for oil; Described detection sleeve having the pressure modulating opening for connecting voltage adjusting device, also having the detection mouth be communicated with described pressure transducer.
Preferably, described pressure transducer is communicated with described detection mouth by flexible pipe, and described flexible pipe is provided with electromagnetic valve.
Preferably, described pressure modulating opening comprises pressurization mouth and vacuum orifice, and described pressurization mouth, vacuum orifice respectively correspondence are provided with the first variable valve, the second variable valve.
Preferably, described detection sleeve also has pressure relief opening, described pressure relief opening correspondence is provided with blowdown valve.
Preferably, described detector also comprises the power supply for providing electric energy, and described power supply is connected with current-limiting protection circuit.
Preferably, described detector is provided with the display screen for showing testing result.
Preferably, described central processing unit comprises single chip processing module, data memory module, valve control module, Timer module.
Preferably, described central processing unit also comprises USB memory module and data transmission module.
Preferably, described detector is also provided with the warning circuit be connected with described central processing unit.
A kind of method utilizing above-mentioned tank wagon gas recovery system for oil tightness detector to detect gas recovery system for oil leakproofness, based on the gas recovery system for oil of tank wagon, described gas recovery system for oil comprises tank body and petroleum vapor recovery pipeline, described tank body is communicated with by petroleum vapor recovery pipeline operated pneumatic valve with petroleum vapor recovery pipeline, and described petroleum vapor recovery pipeline is provided with petroleum vapor recovery pipe line fast joint; It is characterized in that, comprise the following steps:
S1, described connected entrance, pressurization mouth, vacuum orifice to be connected with petroleum vapor recovery pipe line fast joint, external gas source, vacuum pump respectively;
S2, open described petroleum vapor recovery pipeline operated pneumatic valve and detector;
S3, unlatching external gas source are closed after described gas recovery system for oil is pressurized to the first preset pressure value;
S4, keep the first Preset Time after, described pressure transducer gathers the first force value of described gas recovery system for oil;
S5, again open external gas source gas recovery system for oil is pressurized to the second preset pressure value after close;
S6, close described petroleum vapor recovery pipeline operated pneumatic valve and open blowdown valve;
S7, close blowdown valve when described petroleum vapor recovery pipeline internal gas pressure is down to identical with ambient pressure;
S8, keep the second Preset Time after, described pressure transducer gathers the second force value of described petroleum vapor recovery pipeline;
S9, open described petroleum vapor recovery pipeline operated pneumatic valve and open vacuum pump and gas recovery system for oil is reduced pressure to after the 3rd preset pressure value and close;
After S10, maintenance the 3rd Preset Time, described pressure transducer gathers the 3rd force value of described gas recovery system for oil;
S11, described first force value, the second force value, the 3rd force value to be compared with described first preset pressure value, the second preset pressure value, the 3rd preset pressure value respectively;
When the absolute value of the difference of described first force value and the first preset pressure value is less than or equal to the first preset pressure difference, export " qualified ", otherwise, export " defective ";
When the absolute value of the difference of described second force value and the second preset pressure value is less than or equal to the second preset pressure difference, export " qualified ", otherwise, export " defective ";
When the absolute value of the difference of described 3rd force value and the 3rd preset pressure value is less than or equal to the 3rd preset pressure difference, export " qualified ", otherwise, export " defective ".
Compared with prior art, beneficial effect of the present invention is:
Tank wagon gas recovery system for oil tightness detector disclosed by the invention is that mode by measuring air pressure change value is to detect the leakproofness of gas recovery system for oil, the connected entrance of wherein said detection sleeve is connected with gas recovery system for oil, when the pressure modulating opening of described detection sleeve is connected with external gas source or vacuum pump, gas recovery system for oil air pressure inside can be adjusted, the detection mouth simultaneously described detection sleeve offered also is connected with the pressure transducer on detector, described pressure transducer can measure the atmospheric pressure value in gas recovery system for oil in real time, and measurement data is uploaded to described central processing unit, described central processing unit stores data, analyze and provide testing result.Compared with prior art, this device sends the instruction such as supercharging, decompression by central processing unit, and device automatically completes leakproofness and detects action, decreases the workload of testing staff; Utilize pressure transducer to measure atmospheric pressure value, accuracy of detection is high; Data intelligence reads, and reading error is little, efficiency is high and directly can provide testing result, very intuitively.Whole device structure is simple, easy to usely carries.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is electrical principle block diagram of the present invention.
Fig. 3 is tank wagon gas recovery system for oil structural representation.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific implementation method, exemplary embodiment and description of the present invention are used to explain the present invention, but not as a limitation of the invention.
Its concrete technical scheme is:
As shown in Figure 1, Figure 3, a kind of tank wagon gas recovery system for oil tightness detector, comprise detector 1 and detect sleeve 2, described detector 1 comprises pressure transducer 11 for detecting gas recovery system for oil force value and central processing unit 13, and described detection sleeve 2 is hollow structure and one end is provided with connected entrance 21 for connecting gas recovery system for oil; Described detection sleeve 2 having the pressure modulating opening 23 for connecting voltage adjusting device, also having the detection mouth 25 be communicated with described pressure transducer 11.Wherein said gas recovery system for oil comprises tank body 31, petroleum vapor recovery pipeline 33, petroleum vapor recovery pipeline operated pneumatic valve 35, described tank body 31 is communicated with by described petroleum vapor recovery pipeline operated pneumatic valve 35 with petroleum vapor recovery pipeline 33, described petroleum vapor recovery pipeline 33 is provided with oil and gas pipes fast joint 37, and described oil and gas pipes fast joint 37 is for being directly connected with the connected entrance 21 of described detection sleeve 2.
The technical program utilizes the digital pressure sensor 11 be connected with described detection sleeve 2 to measure the pressure in described gas recovery system for oil, and measurement data is uploaded to central processing unit 13, central processing unit 13 stores data, analyzes or uploads.Central processing unit 13 can also control described pressure modulating opening 23 according to pre-set programs, detect the opening and closing of mouth 25 simultaneously, and certain described pressure modulating opening 23 and detection mouth 25 also can Non-follow control.Described pressure modulating opening 23 is connected with vacuum pump or external gas source, and wherein said external gas source can be the equipment such as air compressor machine, gas filling bottle, for filling inert gas or other gas to increase the air pressure in described gas recovery system for oil in described gas recovery system for oil.By controlling the opening and closing of described vacuum pump or external gas source, the supercharging to described gas recovery system for oil or decompression can be realized.By the measurement data that described pressure transducer 11 obtains, just can analyze and judge that whether the leakproofness of described petroleum vapor recovery pipeline 4 is qualified.
The application of tank wagon gas recovery system for oil tightness detector disclosed by the invention is also not limited to and detects the leakproofness of gas recovery system for oil, detects be suitable for too the leakproofness of other tank bodies 3.Described detector 1 is provided with the display screen for showing testing result, the measurement data of described pressure transducer 11 is after described central processing unit 13 processes, the testing result provided is presented on described display screen 15, and described display screen 15 also shows detection time and accuracy of detection etc. simultaneously.Described detector 1 is also provided with the warning circuit be connected with described central processing unit 13.When detect data through the analysis of described central processing unit 13 obtain leakproofness defective time, can inspire described warning circuit, prompting testing staff, the gas recovery system for oil leakproofness of this detection vehicle is defective.
As shown in Figure 1, wherein said pressure transducer 11 is communicated with described detection mouth 25 by flexible pipe 4, and described flexible pipe 4 is provided with electromagnetic valve.Arranging described electromagnetic valve 17 is to protect pressure transducer 11, and when pressure overload, described electromagnetic valve 17 is closed, and described flexible pipe 4 is closed, and avoids the described pressure transducer 11 of the excessive damage of air pressure.
As shown in Figure 1, need when usually carrying out air-leakage test to measure the impermeability of described gas recovery system for oil under malleation and negative pressure state simultaneously, in order to easy to use, described pressure modulating opening 23 comprises pressurization mouth 231 and vacuum orifice 233, and described pressurization mouth 231, vacuum orifice 233 respectively correspondence are provided with the first variable valve 2311, second variable valve 2331.Described like this pressurization mouth 231 is connected with external gas source, described vacuum orifice 233 is connected with described vacuum pump, described first variable valve 2311, second variable valve 2331 controls the opening and closing of described pressurization mouth 231, vacuum orifice 233 respectively, the opening and closing of described first variable valve 2311, second variable valve 2331 or can utilize switch manual to control by described central processing unit 13 Based Intelligent Control, so just can control supercharging or the decompression of described tank body 3.
As shown in Figure 1, for the ease of pressure release, described detection sleeve 2 also has pressure relief opening 27, described pressure relief opening 27 correspondence is provided with blowdown valve 271.Described blowdown valve 271 is the opening and closings for controlling described pressure relief opening 27, and the opening and closing of described blowdown valve 271 or can utilize switch manual to control with the pressure release realizing described gas recovery system for oil by described central processing unit 13 Based Intelligent Control equally.
As shown in Figure 1, described detector 1 also comprises the power supply 19 for providing electric energy, and described power supply is connected with current-limiting protection circuit.Namely described power supply can be portable rechargeable battery, and also can be external power supply, described restriction protection circuit be in order to protection power source.
As shown in Figure 2, wherein said central processing unit 13 comprises single chip processing module, data memory module, valve control module, Timer module.Also comprise USB memory module and data transmission module.Store process of measurement in described single chip processing module, and send command adapted thereto according to pre-set programs.Described data memory module is used to the pressure data storing the measurement of described pressure transducer 11, described valve control module is used to control described electromagnetic valve 17, first variable valve 2311, the opening and closing of the second variable valve 2331 and blowdown valve 271, described Timer module is the time in order to control in testing process, described USB memory module is used to connect External memory equipment, be convenient to data unofficial biography, described data transmission module is used to data or the analysis result of outwardly device transmission measurement, this device can pass through the wireless signal such as WiFi or bluetooth and other equipment connections, realize interconnecting of data and instruction.
As shown in Figure 1, for the ease of carrying transport, this device is also provided with casing, and wherein said detector 1, detection sleeve 2 and external vacuum pump etc. are installed in casing.It is pointed out that the sealing in order to ensure this device self, each parts joining place of this device all uses sealant sealing, guarantees No leakage under the high pressure of gas.
A kind of method utilizing tank wagon gas recovery system for oil tightness detector described above to detect gas recovery system for oil leakproofness is given in the present embodiment, based on the gas recovery system for oil of tank wagon, described gas recovery system for oil comprises tank body 31 and petroleum vapor recovery pipeline 33, and described tank body 31 is communicated with by petroleum vapor recovery pipeline operated pneumatic valve 35 with petroleum vapor recovery pipeline 33; Described petroleum vapor recovery pipeline 33 is provided with the petroleum vapor recovery pipe line fast joint 37 for being connected with described connected entrance 21, when utilizing described external gas source to described gas recovery system for oil plenum, gas first enters described petroleum vapor recovery pipeline 33 by described petroleum vapor recovery pipe line fast joint 37, then enters described tank body 31 via described petroleum vapor recovery pipeline operated pneumatic valve 35.During decompression, gas is via the reverse outflow of above-mentioned parts.
When the current leakproofness for tank wagon gas recovery system for oil detects, main detection three indexs, the airtight performance of gas recovery system for oil described in the first under positive pressurized conditions, it two is described petroleum vapor recovery pipeline operated pneumatic valve 41 airtight performances under positive pressurized conditions, it three is described gas recovery system for oil airtight performances under negative pressurized conditions, if three detections are all qualified, then can draw the conclusion that described gas recovery system for oil leakproofness is qualified, if wherein have one defective, then illustrate that described gas recovery system for oil leakproofness is defective.Its detection comprises the following steps:
S1, described connected entrance 21, pressurization mouth 231, vacuum orifice 233 to be connected with petroleum vapor recovery pipe line fast joint 37, external gas source, vacuum pump respectively;
S2, open described petroleum vapor recovery pipeline operated pneumatic valve 35 and detector 1;
S3, unlatching external gas source are closed after described gas recovery system for oil is pressurized to the first preset pressure value;
S4, keep the first Preset Time after, described pressure transducer 11 gathers the first force value of described gas recovery system for oil;
S5, again open external gas source gas recovery system for oil is pressurized to the second preset pressure value after close;
S6, close described petroleum vapor recovery pipeline operated pneumatic valve 35 and open blowdown valve 271;
S7, close blowdown valve 271 when described petroleum vapor recovery pipeline internal gas pressure is down to identical with ambient pressure;
S8, keep the second Preset Time after, described pressure transducer 11 gathers the second force value of described petroleum vapor recovery pipeline;
S9, open described petroleum vapor recovery pipeline operated pneumatic valve and open vacuum pump and gas recovery system for oil is reduced pressure to after the 3rd preset pressure value and close;
After S10, maintenance the 3rd Preset Time, described pressure transducer gathers the 3rd force value of described gas recovery system for oil;
S11, described first force value, the second force value, the 3rd force value to be compared with described first preset pressure value, the second preset pressure value, the 3rd preset pressure value respectively;
When the absolute value of the difference of described first force value and the first preset pressure value is less than or equal to the first preset pressure difference, export " qualified ", otherwise, export " defective ";
When the absolute value of the difference of described second force value and the second preset pressure value is less than or equal to the second preset pressure difference, export " qualified ", otherwise, export " defective ";
When the absolute value of the difference of described 3rd force value and the 3rd preset pressure value is less than or equal to the 3rd preset pressure difference, export " qualified ", otherwise, export " defective ".
Wherein said first Preset Time, the second Preset Time and the 3rd Preset Time are respectively 3 ~ 10 minutes; Described first Preset Time, the second Preset Time and the 3rd Preset Time are preferably set to 5 minutes; Described first preset pressure value and the second preset pressure value are respectively 1.5 ~ 8kPa, and described 3rd preset pressure value is-1 ~-5kPa.Wherein said first preset pressure value and the second preset pressure value are preferably set to 4.5kPa, and described 3rd preset pressure value preferably arranges-1.5kPa.
More than that the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and embodiment, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention, should not be construed as limitation of the present invention; Therefore one of ordinary skill in the art, according to the embodiment of the present invention, in embodiment and range of application, carry out some simple equivalences replace and distortion application, all should belong to protection scope of the present invention.
Claims (10)
1. a tank wagon gas recovery system for oil tightness detector, it is characterized in that: comprise detector and detect sleeve, described detector comprises pressure transducer for detecting gas recovery system for oil force value and central processing unit, and described detection sleeve is hollow structure and one end is provided with connected entrance for connecting gas recovery system for oil; Described detection sleeve having the pressure modulating opening for connecting voltage adjusting device, also having the detection mouth be communicated with described pressure transducer.
2. tank wagon gas recovery system for oil tightness detector as claimed in claim 1, is characterized in that: described pressure transducer is communicated with described detection mouth by flexible pipe, and described flexible pipe is provided with electromagnetic valve.
3. tank wagon gas recovery system for oil tightness detector as claimed in claim 1 or 2, is characterized in that: described pressure modulating opening comprises pressurization mouth and vacuum orifice, and described pressurization mouth, vacuum orifice respectively correspondence are provided with the first variable valve, the second variable valve.
4. tank wagon gas recovery system for oil tightness detector as claimed in claim 3, it is characterized in that: described detection sleeve also has pressure relief opening, described pressure relief opening correspondence is provided with blowdown valve.
5. tank wagon gas recovery system for oil tightness detector as claimed in claim 1, is characterized in that: described detector also comprises the power supply for providing electric energy, and described power supply is connected with current-limiting protection circuit.
6. tank wagon gas recovery system for oil tightness detector as claimed in claim 1, is characterized in that: described detector is provided with the display screen for showing testing result.
7. tank wagon gas recovery system for oil tightness detector as claimed in claim 1, is characterized in that: described central processing unit comprises single chip processing module, data memory module, valve control module, Timer module.
8. tank wagon gas recovery system for oil tightness detector as claimed in claim 1, is characterized in that: described central processing unit also comprises USB memory module and data transmission module.
9. tank wagon gas recovery system for oil tightness detector as claimed in claim 1, is characterized in that: described detector is also provided with the warning circuit be connected with described central processing unit.
10. the method utilizing tank wagon gas recovery system for oil tightness detector described in claim 4 to detect gas recovery system for oil leakproofness, based on the gas recovery system for oil of tank wagon, described gas recovery system for oil comprises tank body and petroleum vapor recovery pipeline, described tank body is communicated with by petroleum vapor recovery pipeline operated pneumatic valve with petroleum vapor recovery pipeline, and described petroleum vapor recovery pipeline is provided with petroleum vapor recovery pipe line fast joint; It is characterized in that, comprise the following steps:
S1, described connected entrance, pressurization mouth, vacuum orifice to be connected with petroleum vapor recovery pipe line fast joint, external gas source, vacuum pump respectively;
S2, open described petroleum vapor recovery pipeline operated pneumatic valve and detector;
S3, unlatching external gas source are closed after described gas recovery system for oil is pressurized to the first preset pressure value;
S4, keep the first Preset Time after, described pressure transducer gathers the first force value of described gas recovery system for oil;
S5, again open external gas source gas recovery system for oil is pressurized to the second preset pressure value after close;
S6, close described petroleum vapor recovery pipeline operated pneumatic valve and open blowdown valve;
S7, close blowdown valve when described petroleum vapor recovery pipeline internal gas pressure is down to identical with ambient pressure;
S8, keep the second Preset Time after, described pressure transducer gathers the second force value of described petroleum vapor recovery pipeline;
S9, open described petroleum vapor recovery pipeline operated pneumatic valve and open vacuum pump and gas recovery system for oil is reduced pressure to after the 3rd preset pressure value and close;
After S10, maintenance the 3rd Preset Time, described pressure transducer gathers the 3rd force value of described gas recovery system for oil;
S11, described first force value, the second force value, the 3rd force value to be compared with described first preset pressure value, the second preset pressure value, the 3rd preset pressure value respectively;
When the absolute value of the difference of described first force value and the first preset pressure value is less than or equal to the first preset pressure difference, export " qualified ", otherwise, export " defective ";
When the absolute value of the difference of described second force value and the second preset pressure value is less than or equal to the second preset pressure difference, export " qualified ", otherwise, export " defective ";
When the absolute value of the difference of described 3rd force value and the 3rd preset pressure value is less than or equal to the 3rd preset pressure difference, export " qualified ", otherwise, export " defective ".
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510150535.1A CN104792481A (en) | 2015-03-31 | 2015-03-31 | Device and method for detecting leakproofness of oil gas recycling systems of oil tank trucks |
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| CN201510150535.1A CN104792481A (en) | 2015-03-31 | 2015-03-31 | Device and method for detecting leakproofness of oil gas recycling systems of oil tank trucks |
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| CN105004494A (en) * | 2015-08-10 | 2015-10-28 | 中国汽车技术研究中心 | Oil tank car oil gas recovery system sealing performance detection platform and detection method |
| CN105084288A (en) * | 2015-08-13 | 2015-11-25 | 中国石油化工股份有限公司 | Automatic monitoring method for oil vapor recovery leakproofness of gas station |
| CN105241619A (en) * | 2015-10-30 | 2016-01-13 | 南京化工特种设备检验检测研究所 | Detection apparatus of leakage of pressure container |
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| CN110686908A (en) * | 2019-10-21 | 2020-01-14 | 中国汽车技术研究中心有限公司 | Self-adaptive rotary opening and closing type vehicle body air pressure balancing device for test |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105004494A (en) * | 2015-08-10 | 2015-10-28 | 中国汽车技术研究中心 | Oil tank car oil gas recovery system sealing performance detection platform and detection method |
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| CN106226010A (en) * | 2016-07-09 | 2016-12-14 | 滁州市恒信工贸有限公司 | The tank body device for detecting sealability of tank truck and method |
| CN106500934A (en) * | 2016-12-29 | 2017-03-15 | 青岛崂应环境科技有限公司 | A kind of oil truck petroleum vapor recovery detection means and detection method |
| CN109387319A (en) * | 2017-08-09 | 2019-02-26 | 中国石油化工股份有限公司 | The monitoring of gas station's pressure of storage tank and data acquisition device and method |
| CN110686908A (en) * | 2019-10-21 | 2020-01-14 | 中国汽车技术研究中心有限公司 | Self-adaptive rotary opening and closing type vehicle body air pressure balancing device for test |
| CN110686908B (en) * | 2019-10-21 | 2024-04-09 | 中国汽车技术研究中心有限公司 | Self-adaptive rotary opening and closing type automobile body air pressure balancing device for test |
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