CN113431718A - Automobile pipeline with oil way detection function - Google Patents
Automobile pipeline with oil way detection function Download PDFInfo
- Publication number
- CN113431718A CN113431718A CN202110900775.4A CN202110900775A CN113431718A CN 113431718 A CN113431718 A CN 113431718A CN 202110900775 A CN202110900775 A CN 202110900775A CN 113431718 A CN113431718 A CN 113431718A
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- Prior art keywords
- oil
- pipe
- connecting pipe
- oil inlet
- cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0023—Valves in the fuel supply and return system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an automobile pipeline with an oil circuit detection function, which comprises an oil inlet pipe and an oil outlet pipe, wherein the oil inlet pipe and the oil outlet pipe are both of a structure with an opening at one end and a sealing at the other end, the oil inlet pipe and the oil outlet pipe are jointly connected in parallel and provided with a first connecting pipe and a second connecting pipe, the inner diameter of the second connecting pipe is smaller than that of the first connecting pipe, the first connecting pipe is positioned in the oil inlet direction close to the oil inlet pipe and the oil outlet direction of the oil outlet pipe, the joint of the first connecting pipe and the oil inlet pipe is connected with a first one-way valve in a sealing mode, an oil circuit detection switching structure is arranged in the oil inlet pipe, and a dredging structure is arranged in the oil outlet pipe. Has the advantages that: according to the invention, the detection of the oil circuit blocking state is realized by arranging the oil circuit detection switching structure, and the double-channel oil circuit is arranged, so that the oil circuit switching can be automatically carried out when the oil circuit is blocked, thereby ensuring the transportation speed of gasoline and avoiding the problems of insufficient energy supply of an engine and air pollution caused by incomplete combustion of the gasoline.
Description
Technical Field
The invention relates to the technical field of automobile pipelines, in particular to an automobile pipeline with an oil way detection function.
Background
The automobile pipeline comprises an oil pipe for transporting gasoline, and the gasoline is transported to the engine through the oil pipe, so that the gasoline is combusted to provide power for starting the automobile.
In the prior art, after an automobile pipeline is used for a long time, a blockage phenomenon easily occurs, on one hand, the transportation speed of gasoline is reduced, so that the amount of gasoline in unit time of an engine is reduced, the combustion efficiency of the gasoline is influenced, the incomplete combustion of the gasoline is possibly caused to influence the power of the automobile and cause large air pollution, and when the blockage is serious, even a large road safety problem is caused.
Disclosure of Invention
The invention aims to solve the problem that an automobile pipeline is easy to block after being used for a long time in the prior art, and provides the automobile pipeline with an oil way detection function.
An automobile pipeline with an oil circuit detection function comprises an oil inlet pipe and an oil outlet pipe, wherein the oil inlet pipe and the oil outlet pipe are both arranged in a structure with one open end and one sealed end, the oil inlet pipe and the oil outlet pipe are jointly connected in parallel to form a first connecting pipe and a second connecting pipe, the inner diameter of the second connecting pipe is smaller than that of the first connecting pipe, the first connecting pipe is located close to the oil inlet direction of the oil inlet pipe and the oil outlet direction of the oil outlet pipe, the joint of the first connecting pipe and the oil inlet pipe is connected with a first one-way valve in a sealing mode, an oil circuit detection switching structure is arranged in the oil inlet pipe, and a dredging structure for dredging the first connecting pipe is arranged in the oil outlet pipe;
the oil circuit detects switches structure including fixed setting at the spacing section of thick bamboo of advancing oil pipe sealed end, sliding connection has sealed piece in the spacing section of thick bamboo, the size of a dimension of sealed piece cooperatees with the internal diameter that advances oil pipe, sealed piece is provided with round permanent magnet layer with the junction of a spacing section of thick bamboo, the sealed sliding connection of inner wall of a spacing section of thick bamboo has the permanent magnet piece, the magnetic pole that the permanent magnet piece takes is different extremely relative and both are located same high department with the magnetic pole that the permanent magnet layer takes, the bottom fixedly connected with spring of permanent magnet piece, the bottom fixed connection of spring is in the bottom of a spacing section of thick bamboo, the circular shape fixed block of top fixedly connected with of a spacing section of thick bamboo, the external diameter of fixed block is greater than the external diameter of a spacing section of thick bamboo.
At foretell car pipeline with oil circuit detects function, the oil circuit detects switches the structure including fixed setting at the spacing section of thick bamboo of advancing the sealed end of oil pipe, sliding connection has sealed piece in the spacing section of thick bamboo, the size of a dimension of sealed piece cooperatees with the internal diameter that advances oil pipe, the sealed piece is provided with round permanent magnet layer with the junction of a spacing section of thick bamboo, the sealed sliding connection of inner wall of a spacing section of thick bamboo has permanent magnet piece, the magnetic pole that permanent magnet piece takes is opposite and both are located same high department with the heteropolar of magnetic pole that permanent magnet layer takes, the bottom fixedly connected with spring of permanent magnet piece, the bottom fixed connection of spring is in the bottom of a spacing section of thick bamboo, the circular shape fixed block of top fixedly connected with of a spacing section of thick bamboo, the external diameter of fixed block is greater than the external diameter of a spacing section of thick bamboo.
At foretell vehicle pipeline with oil circuit detects function, be connected with a plurality of shunt tubes in first connecting pipe and the second connecting pipe jointly, it is a plurality of the shunt tubes equidistance sets up, every the equal sealing connection of junction of shunt tubes and second connecting pipe has a second check valve, the top intercommunication of first connecting pipe is provided with a plurality of spouts, and is a plurality of spout equidistance sets up and arbitrary one spout and the equal dislocation set of shunt tubes, and is a plurality of spout the common intercommunication of a section of thick bamboo is provided with the storage case, the both sides of storage case have respectively into oil pipe and play oil pipe fixed connection, be equipped with liquid vinegar in the storage case.
At foretell vehicle pipeline with oil circuit detects function, the shower nozzle includes shower nozzle and barrel, the sealed lateral wall that runs through first connecting pipe of shower nozzle, inlay in the shower nozzle and be equipped with heating resistor, temperature controller and pressure sensor, be provided with the aspiration pump in the barrel and be provided with the solenoid valve with the junction of storage case, a plurality of interface channel have been seted up with the storage case intercommunication to the barrel.
At foretell vehicle pipeline with oil circuit detects function, the bottom of storage case is provided with the stage, the feed inlet has been seted up at the top of storage case, sealing connection has the sealing plug in the feed inlet, a plurality of connected channels that the nozzle cone is connected are located the stage, and the storage case is filled with buffer gas and is located isolated oxygen's environment.
Compared with the prior art, the invention has the advantages that:
1: according to the invention, the detection of the oil circuit blocking state is realized by arranging the oil circuit detection switching structure, and the double-channel oil circuit is arranged, so that the oil circuit switching can be automatically carried out when the oil circuit is blocked, thereby ensuring the transportation speed of gasoline and avoiding the problems of insufficient energy supply of an engine and air pollution caused by incomplete combustion of the gasoline.
2: when switching the oil circuit, the second connecting pipe that sets up is less than in first connecting pipe internal diameter, when transporting petrol through the second connecting pipe like this, will export great oil pressure to its inner wall, and such benefit lies in, through the connection of a plurality of shunt tubes, realizes detecting the route of a plurality of position points of first connecting pipe.
3: a section of thick bamboo is spouted in dislocation set between two adjacent shunt tubes for when petrol can't be through a certain connecting pipe, gaseous vinegar is spouted to two adjacent spouts, thereby reduces the boiling point of petrol, makes and carries out under the effect of some heating at the shower nozzle light weight, and the mixed solid gasification of petrol siltation department, thereby removes its state that blocks up, realizes the unobstructed effect of oil circuit, facilitates the use.
Drawings
FIG. 1 is a schematic structural diagram of an automotive pipeline with an oil path detection function according to the present invention;
FIG. 2 is an enlarged schematic view of a portion A of an automotive pipeline with an oil passage detection function according to the present invention;
FIG. 3 is an enlarged schematic view of a portion B of an automotive pipeline with an oil path detection function according to the present invention;
fig. 4 is a cross-sectional view of a sealing block in an automotive pipeline with an oil path detection function according to the present invention.
In the figure: the device comprises an oil inlet pipe 1, an oil outlet pipe 2, a first connecting pipe 3, a second connecting pipe 4, a limiting barrel 5, a sealing block 6, a permanent magnet layer 7, a permanent magnet block 8, a spring 9, a connecting barrel 10, a hydraulic cylinder 11, a first check valve 12, a shunt pipe 13, a second check valve 14, a spray head 151, a barrel 152, a storage tank 16, a storage tank 17, a sealing plug 18, a fixing block 19, a connecting channel 20 and a stirring blade 21.
Detailed Description
Referring to fig. 1-4, an automobile pipeline with an oil path detection function comprises an oil inlet pipe 1 and an oil outlet pipe 2, wherein the oil inlet pipe 1 and the oil outlet pipe 2 are both arranged in a structure with an opening at one end and a sealing at the other end, the oil inlet pipe 1 and the oil outlet pipe 2 are jointly connected in parallel to form a first connecting pipe 3 and a second connecting pipe 4, the inner diameter of the second connecting pipe 4 is smaller than that of the first connecting pipe 3, the first connecting pipe 3 is positioned close to the oil inlet direction of the oil inlet pipe 1 and the oil outlet direction of the oil outlet pipe 2, the joint of the first connecting pipe 3 and the oil inlet pipe 1 is connected with a first one-way valve 12 in a sealing manner, an oil path detection switching structure is arranged in the oil inlet pipe 1, and a dredging structure for dredging the first connecting pipe 3 is arranged in the oil outlet pipe 2;
the oil circuit detection switching structure comprises a limiting cylinder 5 fixedly arranged at the sealing end of an oil inlet pipe 1, a sealing block 6 is connected in the limiting cylinder 5 in a sliding manner, the size of the sealing block 6 is matched with the inner diameter of the oil inlet pipe 1, a circle of permanent magnet layer 7 is arranged at the joint of the sealing block 6 and the limiting cylinder 5, a permanent magnet block 8 is connected in the limiting cylinder 5 in a sealing and sliding manner, the magnetic pole of the permanent magnet block 8 is opposite to the magnetic pole of the permanent magnet layer 7 in a heteropolar manner and is positioned at the same height, so that when the permanent magnet block 8 moves, the sealing block 6 is driven to move, the sealing block 6 can also drive the permanent magnet block 8 to move, the bottom of the permanent magnet block 8 is fixedly connected with a spring 9, the bottom of the spring 9 is fixedly connected to the bottom of the limiting cylinder 5, the top of the limiting cylinder 5 is fixedly connected with a round fixing block 19, the outer diameter of the fixing block 19 is larger than the outer diameter of the limiting cylinder 5, and the round fixing block 19 can limit the vertical position of the sealing block 6, realize the effect of switching the oil duct through spacing section of thick bamboo 5 and sealed piece 6, and the permanent magnet layer 7 and the permanent magnet piece 8 that set up can make sealed piece 6 can not appear the gap with being connected of spacing section of thick bamboo 5 to avoid inside spring 9 to receive adhering to of petrol and influence elasticity performance, also avoided adopting other transmission structure and the petrol that probably causes solidifies the problem of blockking up connecting elements.
The dredging structure comprises a connecting cylinder 10 communicated with an oil outlet pipe 2, the connecting cylinder 10 is arranged on one side of the oil outlet pipe 2 far away from a first connecting pipe 3, a hydraulic cylinder 11 is fixedly connected to the bottom of the connecting cylinder 10, a stirring blade 21 is arranged at the movable end of the hydraulic cylinder 11, a rotating shaft is fixedly connected to the rotating center of the stirring blade 21 and is electrically connected with a micro motor embedded in the hydraulic cylinder 11, a plurality of shunt pipes 13 are commonly connected in the first connecting pipe 3 and a second connecting pipe 4, the shunt pipes 13 are arranged at equal intervals, a second one-way valve 14 is hermetically connected at the joint of each shunt pipe 13 and the second connecting pipe 4, the flow direction of gasoline is controlled through the second one-way valve 14, a plurality of spray cylinders are communicated and arranged at equal intervals on the top of the first connecting pipe 3, any one spray cylinder and any one of the spray cylinders are staggered with the shunt pipes 13, a storage tank 16 is communicated and arranged together with the plurality of spray cylinders, the oil inlet pipe 1 and the oil outlet pipe 2 are fixedly connected with each other on two sides of the storage box 16, liquid vinegar is filled in the storage box 16, and the liquid vinegar has the characteristics of low boiling point and low boiling point of gasoline after being mixed with the gasoline.
The spray cylinder comprises a spray head 151 and a cylinder body 152, the spray head 151 penetrates through the side wall of the first connecting pipe 3 in a sealing mode, a heating resistor, a temperature controller and a pressure sensor are embedded in the spray head 151, vinegar steam and solid gasoline impurities output by the spray head 151 are heated simultaneously through the heating resistor, the pressure sensor can sense whether the pipe wall of the first connecting pipe 3 is under pressure at each point when the second connecting pipe 4 is output through the flow dividing pipe 13, a suction pump is arranged in the cylinder body 152, an electromagnetic valve is arranged at the joint of the cylinder body and the storage tank 16, vinegar in the storage tank 16 is sucked out and sprayed into the first connecting pipe 3 through the suction pump, the cylinder body 152 is communicated with the storage tank 16 and provided with a plurality of connecting channels 20, the bottom of the storage tank 16 is provided with a step layer 17, and the step layer 17 has the advantages that the vinegar liquid is separated from the connecting channels 20, so that the liquid cannot directly enter the cylinder body 152, the feed inlet has been seted up at the top of storage case 16, and sealing connection has sealing plug 18 in the feed inlet, spouts a plurality of connected passageways 20 that the section of thick bamboo is connected and is located the stage level 17, and storage case 16 is filled with buffer gas and is located the environment of isolated oxygen, and inert gas can be chooseed for use to buffer gas, avoids the gasoline vapor that overflows like this and the air emergence mixes and the explosion problem that produces.
When the device is used, the arranged first connecting pipe 3 is used as a main oil duct, the pipe diameter of the first connecting pipe is large, the flow speed is low, the second connecting pipe 4 is used as an auxiliary oil duct, the first connecting pipe can be opened under the action of the pressure output by the gasoline pump only when the main oil duct is blocked, and the pipe diameter of the arranged second connecting pipe 4 is small, so that the pipe wall of the second connecting pipe 4 is high in flow speed, and the plurality of shunt pipes 13 and the corresponding second one-way valves 14 can be used for detecting all parts of the first connecting pipe 3 through the shunting action;
when the blockage state of the first connecting pipe 3 is light, namely the blockage occurs at a certain point of the first connecting pipe 3, at the moment, a pressure sensor at the position of the spraying cylinder, which is far away from one side of the oil outlet pipe 2, receives the action of oil pressure, so that the point is respectively heated and sprayed with vinegar steam through an air suction pump and a heating resistor in the cylinder 152, and thus, the boiling point of the gas-state vinegar is lower after the freezing point of the gas-state vinegar and the freezing point of the gasoline are combined, so that the gasoline in the solidification state flows back to the cylinder 152 and the storage tank 16 along with the gas-state vinegar under the heating action, and the desilting work at the position is realized;
and when the above operation cannot solve the problem of the blockage of the first connection pipe 3, the agitating blade 21 is simultaneously extended and rotated by extending the hydraulic cylinder 11 and activating the agitating blade 21, thereby performing a physical cleaning effect and facilitating use.
Claims (5)
1. An automobile pipeline with an oil way detection function comprises an oil inlet pipe (1) and an oil outlet pipe (2), it is characterized in that the oil inlet pipe (1) and the oil outlet pipe (2) are both arranged into a structure with one open end and one sealed end, the oil inlet pipe (1) and the oil outlet pipe (2) are jointly and parallelly connected with a first connecting pipe (3) and a second connecting pipe (4), the inner diameter of the second connecting pipe (4) is smaller than that of the first connecting pipe (3), the first connecting pipe (3) is positioned close to the oil inlet direction of the oil inlet pipe (1) and the oil outlet direction of the oil outlet pipe (2), the joint of the first connecting pipe (3) and the oil inlet pipe (1) is hermetically connected with a first one-way valve (12), an oil circuit detection switching structure is arranged in the oil inlet pipe (1), and a dredging structure for dredging the first connecting pipe (3) is arranged in the oil outlet pipe (2);
the oil circuit detection switching structure comprises a limiting cylinder (5) fixedly arranged at the sealing end of the oil inlet pipe (1), a sealing block (6) is connected in the limiting cylinder (5) in a sliding way, the size of the sealing block (6) is matched with the inner diameter of the oil inlet pipe (1), a circle of permanent magnet layer (7) is arranged at the joint of the sealing block (6) and the limiting cylinder (5), the inner wall of the limiting cylinder (5) is connected with a permanent magnet block (8) in a sealing and sliding way, the magnetic poles of the permanent magnet blocks (8) are opposite to the magnetic poles of the permanent magnet layer (7) in different poles and are positioned at the same height, the bottom of the permanent magnet block (8) is fixedly connected with a spring (9), the bottom of the spring (9) is fixedly connected with the bottom of the limiting cylinder (5), the top of the limiting cylinder (5) is fixedly connected with a round fixing block (19), and the outer diameter of the fixing block (19) is larger than that of the limiting cylinder (5).
2. The vehicle pipeline with the oil circuit detection function according to claim 1, wherein the dredging structure comprises a connecting cylinder (10) communicated with the oil outlet pipe (2), the connecting cylinder (10) is arranged on one side of the oil outlet pipe (2) far away from the first connecting pipe (3), a hydraulic cylinder (11) is fixedly connected to the bottom of the connecting cylinder (10), a stirring blade (21) is arranged at the movable end of the hydraulic cylinder (11), a rotating shaft is fixedly connected to the rotation center of the stirring blade (21) and is electrically connected with a micro motor embedded in the hydraulic cylinder (11).
3. The automobile pipeline with the oil circuit detection function according to claim 2, wherein a plurality of shunt pipes (13) are commonly connected in the first connecting pipe (3) and the second connecting pipe (4), the shunt pipes (13) are arranged at equal intervals, a second one-way valve (14) is hermetically connected at the joint of each shunt pipe (13) and the second connecting pipe (4), a plurality of spray barrels are communicated with the top of the first connecting pipe (3), the spray barrels are arranged at equal intervals, any one of the spray barrels and the shunt pipes (13) are arranged in a staggered mode, a storage tank (16) is communicated with the spray barrels, an oil inlet pipe (1) and an oil outlet pipe (2) are fixedly connected to two sides of the storage tank (16), and liquid vinegar is filled in the storage tank (16).
4. The automobile pipeline with the oil circuit detection function according to claim 3, wherein the spray cylinder comprises a spray head (151) and a cylinder body (152), the spray head (151) penetrates through the side wall of the first connecting pipe (3) in a sealing mode, a heating resistor, a temperature controller and a pressure sensor are embedded in the spray head (151), an air suction pump is arranged in the cylinder body (152), an electromagnetic valve is arranged at the joint of the air suction pump and the storage tank (16), and the cylinder body (152) is communicated with the storage tank (16) to form a plurality of connecting channels (20).
5. The automobile pipeline with the oil way detection function according to claim 4, wherein a step layer (17) is arranged at the bottom of the storage box (16), a feeding hole is formed in the top of the storage box (16), a sealing plug (18) is connected in the feeding hole in a sealing mode, a plurality of connecting channels (20) connected with the spray cylinders are located in the step layer (17), and the storage box (16) is filled with buffer gas and is in an oxygen-isolated environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110900775.4A CN113431718B (en) | 2021-08-06 | 2021-08-06 | Automobile pipeline with oil circuit detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110900775.4A CN113431718B (en) | 2021-08-06 | 2021-08-06 | Automobile pipeline with oil circuit detection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113431718A true CN113431718A (en) | 2021-09-24 |
| CN113431718B CN113431718B (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110900775.4A Active CN113431718B (en) | 2021-08-06 | 2021-08-06 | Automobile pipeline with oil circuit detection function |
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| Country | Link |
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| CN (1) | CN113431718B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016177008A1 (en) * | 2015-05-05 | 2016-11-10 | 常州市金坛翰广科技有限公司 | Anti-clogging oil conduit |
| CN111750811A (en) * | 2020-07-21 | 2020-10-09 | 合肥江淮汽车制管有限公司 | Pipeline inspection tool and air tightness testing device thereof |
| CN211649839U (en) * | 2019-12-10 | 2020-10-09 | 安徽启东热能科技有限公司 | Double-path automatic oil inlet device driven by compressed air |
-
2021
- 2021-08-06 CN CN202110900775.4A patent/CN113431718B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016177008A1 (en) * | 2015-05-05 | 2016-11-10 | 常州市金坛翰广科技有限公司 | Anti-clogging oil conduit |
| CN211649839U (en) * | 2019-12-10 | 2020-10-09 | 安徽启东热能科技有限公司 | Double-path automatic oil inlet device driven by compressed air |
| CN111750811A (en) * | 2020-07-21 | 2020-10-09 | 合肥江淮汽车制管有限公司 | Pipeline inspection tool and air tightness testing device thereof |
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| Publication number | Publication date |
|---|---|
| CN113431718B (en) | 2023-06-23 |
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