CN211425775U

CN211425775U - Device for detecting air tightness of plastic inner container of gas cylinder

Info

Publication number: CN211425775U
Application number: CN201922393700.2U
Authority: CN
Inventors: 黄胜德; 张红卫; 蔡莺莺; 辛美音; 沈海娟
Original assignee: China Petroleum and Chemical Corp; Sinopec Shanghai Petrochemical Co Ltd
Current assignee: China Petroleum and Chemical Corp; Sinopec Shanghai Petrochemical Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-09-04
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses a device that is used for gas cylinder plastics inner bag gas tightness to detect relates to high-pressure vessel plastics inner bag technical field, specifically is a device that is used for gas cylinder plastics inner bag gas tightness to detect, including house steward, testing platform, the one end fixedly connected with air supply station of house steward. This a device for gas cylinder plastics inner bag gas tightness detects, cooperation through air supply station and house steward manometer and shut manometer is used, it is fixed in portable last along with shape anchor clamps and down along with in the shape anchor clamps to detect the inner bag, fixed metal head and inner bag relative position, later provide pressure through the air supply station and fill with higher pressure to needing to detect the inner bag inside, change and scribble the soap lye at butt weld seam department and confirm whether satisfy the technological requirement through observing the reading on house steward manometer and the shut manometer, the convenience that this a device for gas cylinder plastics inner bag gas tightness detects has been improved.

Description

Device for detecting air tightness of plastic inner container of gas cylinder

Technical Field

The utility model relates to a high-pressure vessel plastic inner bag technical field specifically is a device that is used for gas cylinder plastic inner bag gas tightness to detect.

Background

At present, the inner container of the high-pressure hydrogen storage cylinder mainly has two forms, namely a metal inner container (type III) and a plastic inner container (type IV). For a 70MPa gas cylinder, the plastic inner container is widely applied due to the light weight, good fatigue performance and no hydrogen embrittlement problem. However, compared with the process of integrally forming the metal liner, the plastic liner is composed of a plastic cylinder and a metal end enclosure, the plastic cylinder can be made in the modes of rotational molding, blow molding, injection molding, extrusion and the like, can be an integral body or can be obtained by welding the cylinder, and the connection mode of the plastic cylinder and the metal end enclosure is generally welding or gluing. Because of different molding processes, the plastic liner may have weak points at the joints of the plastic liner and the metal end sockets, and leakage may occur. Even if the inner container is integrally formed by embedding, pores may still exist at the joint of metal and plastic. Plastic barrel sections may also be defective due to abnormalities or inadvertent manufacturing. Therefore, after the inner container is produced, the inner containers must be inspected one by one, and the leakage-free rear side can be used for winding. At present, the methods for checking the air tightness of the liner mainly comprise a water immersion method and a liquid coating method. Because the plastic inner container is lighter, the water immersion method is difficult to be completely immersed, and the method is difficult to be applied. And the plastic inner container has more possible leakage points, such as metal end socket joints, welding parts and even cylinder bodies, so that the liquid coating method has lower efficiency and is possible to leak. And because the plastic inner container can expand and deform after being pressurized, the metal end socket can be separated from the deformed plastic inner container under certain pressure, and the structure of the inner container is possibly damaged if the inner container inspection method is controlled improperly, so that the device for detecting the air tightness of the plastic inner container of the gas cylinder is provided.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a device that is used for gas cylinder plastic inner bag gas tightness to detect has solved the problem that proposes in the above-mentioned background art.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a device for detecting the air tightness of a plastic inner container of a gas cylinder comprises a header pipe and a detection platform, wherein one end of the header pipe is fixedly connected with a gas supply station, the surface of the header pipe is sequentially and fixedly connected with a header pipe valve, a header pipe pressure gauge and a relief port with a valve from left to right, the other end of the header pipe is fixedly connected with pipeline branches, the number of the pipeline branches is more than two, the surface of the pipeline branches is fixedly connected with branch valves, the surface of the pipeline branches is fixedly connected with branch pressure gauges positioned on the right sides of the branch valves, one end of the pipeline branches is fixedly provided with a quick connector, one end of the quick connector is fixedly provided with a connecting hose, the upper surface of the detection platform is fixedly connected with a lower conformal clamp, an inner container to be detected is placed in an inner cavity of the lower conformal clamp, and the upper surface of the lower conformal clamp is fixedly connected with a movable upper conformal, one end of the detection platform is movably connected with a movable rear baffle, and the other end of the detection platform is fixedly connected with a front baffle.

Optionally, the number of the detection platforms corresponds to the number of the connecting hoses, one is that the upper surface of the detection platform is fixedly connected with a lower conformal fixture, and a standard liner is placed in an inner cavity of the lower conformal fixture.

Optionally, the movable rear baffle and the front baffle are perpendicular to the upper surface of the detection platform, through holes are formed in the centers of the front baffle and the movable rear baffle, and the diameter of each through hole is smaller than that of the metal seal head of the plastic liner.

Optionally, the lower conformal fixture, the inner cavity of the movable upper conformal fixture and the inner cavity of the through hole are both covered with thin-layer hard cotton, the hard cotton is made of low-melting-point polyester hollow fibers, the shapes of the movable upper conformal fixture and the lower conformal fixture are matched with the shape of the barrel body section of the plastic inner container, and the movable upper conformal fixture is controlled to ascend and descend by the air cylinder.

Optionally, one end of the connecting hose is fixedly connected to one end of the inner container or the standard inner container to be detected through the quick connector, and two ends of the inner container and the standard inner container to be detected extend to the inner cavity of the through hole.

The utility model provides a device that is used for gas cylinder plastics inner bag gas tightness to detect possesses following beneficial effect:

1. this a device for gas cylinder plastics inner bag gas tightness detects, cooperation through air supply station and house steward manometer and shut manometer is used, it is fixed in portable last along with shape anchor clamps and down along with in the shape anchor clamps to detect the inner bag, fixed metal head and inner bag relative position, later provide pressure through the air supply station and fill with higher pressure to needing to detect the inner bag inside, change and scribble the soap lye at butt weld seam department and confirm whether satisfy the technological requirement through observing the reading on house steward manometer and the shut manometer, the convenience that this a device for gas cylinder plastics inner bag gas tightness detects has been improved.

2. The device for detecting the air tightness of the plastic inner container of the gas cylinder utilizes the matching use of the front baffle, the movable rear baffle, the movable upper conformal fixture and the lower conformal fixture to be closely attached to the inner container to be detected or a standard inner container when compressed air with higher pressure is filled, the inner container still has certain deformation under the pressure because the surfaces of the baffle and the fixture are covered with thin hard cotton layers, but the deformation is more uniform compared with the state without the fixture, the influence of irregular deformation on the performance of the gas cylinder is avoided, the state is particularly suitable for the inspection of the welding seam quality, when the inner container is in a free state under the lower pressure, the movable upper conformal fixture and the movable rear baffle are separated from the inner container, and the overall change is not large because the pressure is smaller and the inner container deforms, the slight deformation of the gas cylinder does not damage the structure of the inner container. Maintain longer test time under this state, can further detect plastic inner bag sealing performance, be favorable to exposing in advance of hidden danger, improved this a device for gas cylinder plastic inner bag gas tightness detects's practicality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the conformal fixture of the present invention;

FIG. 3 is a schematic structural view of the shape following tooling position of the liner in a limited state;

fig. 4 is a schematic structural view of the shape following tool position of the liner in a free state.

In the figure: 1. a main pipe valve; 2. a shunt valve; 3. a relief port with a valve; 4. a main pipe pressure gauge; 5. a shunt pressure gauge; 6. a header pipe; 7. branching a pipeline; 8. a quick connector; 9. a detection platform; 10. a front baffle; 11. a movable tailgate; 12. the upper conformal fixture can be moved; 13. a lower conformal fixture; 14. the inner container needs to be detected; 15. a standard inner container; 16. a conversion head; 17. a connecting hose; 18. and a gas supply station.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1 to 4, the present invention provides a technical solution: a device for detecting the air tightness of a plastic inner container of a gas cylinder comprises a header pipe 6 and detection platforms 9, wherein the number of the detection platforms 9 corresponds to the number of connecting hoses 17, the upper surface of one detection platform 9 is fixedly connected with a lower conformal fixture 13, a standard inner container 15 is placed in an inner cavity of the lower conformal fixture 13, whether a detected inner container meets the standard or not can be judged by observing whether the data difference between branch pressure meters 5 which are respectively connected with a liner 14 to be detected and the connecting hoses 17 of the standard inner container 15 is within a process allowable range or not, one end of the header pipe 6 is fixedly connected with a gas supply station 18, the surface of the header pipe 6 is fixedly connected with a header pipe valve 1, a header pipe pressure meter 4 and a gas release port 3 with valves from left to right in sequence, the other end of the header pipe 6 is fixedly connected with pipeline branch pipes 7, the number of the pipeline branch pipes 7 is more than two, the surface of the pipeline branch 7 is fixedly connected with a branch pressure gauge 5 positioned on the right side of the branch valve 2, one end of the pipeline branch 7 is fixedly provided with a quick connector 8, one end of the quick connector 8 is fixedly provided with a connecting hose 17, one end of the connecting hose 17 is fixedly connected to one end of a liner 14 to be detected or a standard liner 15 through the quick connector 8, two ends of the liner 14 to be detected and the standard liner 15 extend to inner cavities of through holes, the liner 14 to be detected and the standard liner 15 are sleeved through the through holes, so that the liner 14 to be detected and the standard liner 15 are fixed, the upper surface of the detection platform 9 is fixedly connected with a lower conformal clamp 13, the inner cavity of the lower conformal clamp 13 is provided with the liner 14 to be detected, the upper surface of the lower conformal clamp 13 is fixedly connected with a movable upper conformal clamp 12 positioned on the upper surface of the liner 14 to be detected, one end of the detection platform 9 is movably connected with a movable, the other end of the detection platform 9 is fixedly connected with a front baffle 10, the inner cavities of the lower conformal fixture 13 and the movable upper conformal fixture 12 and the inner cavity of the through hole are all covered with thin-layer hard cotton, the hard cotton is made of 4080 low-melting-point polyester hollow fibers, the shapes of the movable upper conformal fixture 12 and the lower conformal fixture 13 are matched with the shape of the barrel section of the plastic inner container, the movable upper conformal fixture 12 is controlled to lift by an air cylinder, the contact surfaces of the lower conformal fixture 13, the movable upper conformal fixture 12, the movable rear baffle 11, the front baffle 10, the inner container 14 to be detected and the standard inner container 15 are all covered with thin-layer hard cotton, the hard cotton is made of 4080 low-melting-point polyester hollow fibers, the firmness is good, the air permeability is strong, the deformation resilience rate is high, the hard cotton plays a protection role, prevents scratches caused by direct contact of a metal fixture and the plastic surface, and also allows the inner container to deform to a certain extent after, the movable upper conformal fixture 12 and the movable lower conformal fixture 13 are convenient for fixing the liner 14 or the standard liner 15 to be detected, the use convenience of the device for detecting the air tightness of the plastic liner of the gas cylinder is improved, the movable rear baffle 11 and the front baffle 10 are both vertical to the upper surface of the detection platform 9, through holes are arranged at the centers of the front baffle 10 and the movable rear baffle 11, the aperture of each through hole is smaller than the diameter of the metal seal head of the plastic liner, the two ends of the inner container 14 to be detected and the standard inner container 15 are fixed through the movable back baffle 11 and the front baffle 10, further avoiding the left and right movement of the inner container 14 to be detected and the standard inner container 15, simultaneously using the lower conformal clamp 13 to place the inner container 14 to be detected and the standard inner container 15, meanwhile, the inner container 14 to be detected and the standard inner container 15 are fixed through the movable upper conformal fixture 12.

To sum up, when the device for detecting the air tightness of the plastic liner of the gas cylinder is used, firstly, a conversion head 16 is arranged at one end of a metal seal head of a liner 14 to be detected and is used for introducing compressed air, the liner 14 to be detected is arranged in an inner cavity of a lower conformal fixture 13, after the liner 14 to be detected is arranged, a movable rear baffle 11 at the tail part is fixed, a through hole on the movable rear baffle 11 is contacted with a seal head at the tail part, an air pipe on an air pipeline is inserted into a quick connector 8 at the through hole of the seal head, a movable upper conformal fixture 12 above a cylinder body section is slowly put down, sponge on the surface of the movable upper conformal fixture is contacted with the liner, a branch valve 2 is opened, then a main pipe valve 1 is slowly opened, the liner 14 to be detected on each connecting hose 17 is slowly filled with compressed air at the same time, the pressure can reach about 0.3MPa, when a branch 5 reaches a preset value, the main pipe valve 1 is closed, when the pointer of the branch pressure gauge 5 is stable, the branch valve 2 is closed, according to measurement, the deformation of the inner container is slightly higher than the deformation rate of the inner container after carbon fiber winding, but the deformation is more uniform due to the restriction of the front baffle 10 and the movable rear baffle 11, under the pressure, the bad conditions of the welding part and the end socket connection part can be quickly found, the pressure is maintained for 1min, if the pressure of the branch pressure gauge 5 on the connecting hose 17 at one end of the inner container 14 needs to be detected is not lower than the pressure of the branch pressure gauge 5 on the connecting hose 17 at one end of the standard inner container 15, the first round of detection is qualified, then the branch valve 2 is opened, the air release port 3 with the valve on the main pipe 6 way is opened, the compressed air in the bottle is released, after the air is released, the movable front baffle 10 of the movable rear baffle 11 outside the inner container 14 needing to be detected and the movable upper conformal fixture 12 are, slowly opening a main pipe valve 1, re-inflating to 0.1MPa, after a preset value is reached, closing the main pipe valve 1, closing branch valves 2 after the numerical values on all branch pressure gauges 5 are stable, at the moment, the main pipe valve is in a stable pressure detection state, the gas cylinder is slightly expanded in the state, the total pressure is reduced to a certain extent due to the fact that the gas cylinder is expanded and the quality of the internal gas is unchanged, observing the change of the branch pressure gauges 5 after 10min, if the pressure of the branch pressure gauge 5 on a connecting hose 17 at one end of a liner 14 is required to be detected to be not lower than the pressure of the branch pressure gauge 5 on a connecting hose 17 at one end of a standard liner 15, indicating that the test is qualified, the liner 14 required to be detected can be used for winding carbon fibers, if the readings of the two branch pressure gauges 5 are lower than a certain range, the liner is unqualified, at the, the conversion head 16 is allowed to be mounted again, if leakage occurs at other positions, recording is carried out, and the production record of the inner container 14 to be detected is checked.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a device for gas cylinder plastics inner bag gas tightness detects, includes house steward (6), testing platform (9), its characterized in that: the gas supply device is characterized in that one end of the header pipe (6) is fixedly connected with a gas supply station (18), the surface of the header pipe (6) is sequentially and fixedly connected with a header pipe valve (1), a header pipe pressure gauge (4) and a relief port (3) with a valve from left to right, the other end of the header pipe (6) is fixedly connected with a pipeline branch (7), the number of the pipeline branch (7) is more than two, the surface of the pipeline branch (7) is fixedly connected with a branch valve (2), the surface of the pipeline branch (7) is fixedly connected with a branch pressure gauge (5) positioned on the right side of the branch valve (2), one end of the pipeline branch (7) is fixedly provided with a quick connector (8), one end of the quick connector (8) is fixedly provided with a connecting hose (17), the upper surface of the detection platform (9) is fixedly connected with a lower conformal clamp (13), and an inner cavity of the lower conformal clamp (, the upper surface of the lower conformal clamp (13) is fixedly connected with a movable upper conformal clamp (12) which is located on the upper surface of a liner (14) to be detected, one end of the detection platform (9) is movably connected with a movable rear baffle (11), and the other end of the detection platform (9) is fixedly connected with a front baffle (10).

2. The device for detecting the airtightness of the plastic inner container of the gas cylinder according to claim 1, is characterized in that: the number of the detection platform (9) corresponds to the number of the connecting hoses (17), one is that the upper surface of the detection platform (9) is fixedly connected with a lower conformal fixture (13), and a standard inner container (15) is placed in an inner cavity of the lower conformal fixture (13).

3. The device for detecting the airtightness of the plastic inner container of the gas cylinder according to claim 1, is characterized in that: the movable rear baffle (11) and the front baffle (10) are perpendicular to the upper surface of the detection platform (9), through holes are formed in the centers of the front baffle (10) and the movable rear baffle (11), and the aperture of each through hole is smaller than the diameter of the metal seal head of the plastic liner.

4. The device for detecting the airtightness of the plastic inner container of the gas cylinder according to claim 1, is characterized in that: the shape of down following shape anchor clamps (13) and portable interior chamber and the inner chamber of through-hole of going up following shape anchor clamps (12) all cover to have the thin layer stereoplasm cotton, and the cotton material of stereoplasm is 4080 low melting point dacron hollow fiber, the shape of portable going up following shape anchor clamps (12) and down following shape anchor clamps (13) and the shape looks adaptation of plastics inner bag barrel section appearance, and portable going up following shape anchor clamps (12) and control by the cylinder and go up and down.

5. The device for detecting the airtightness of the plastic inner container of the gas cylinder according to claim 1, is characterized in that: one end of the connecting hose (17) is fixedly connected to one end of the inner container (14) or the standard inner container (15) to be detected through the quick connector (8), and two ends of the inner container (14) and the standard inner container (15) to be detected extend to the inner cavity of the through hole.