CN114877242A

CN114877242A - Gas cylinder with hydrogen leakage monitoring function and hydrogen leakage monitoring method

Info

Publication number: CN114877242A
Application number: CN202110167339.0A
Authority: CN
Inventors: 刘峰; 赵利可; 周小兵; 李楠; 刘岩
Original assignee: Xinqi Times Beijing Material Technology Co ltd
Current assignee: Xinqi Times Beijing Material Technology Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-08-09
Anticipated expiration: 2041-02-05
Also published as: CN114877242B

Abstract

The invention relates to a gas cylinder with a hydrogen leakage monitoring function and a hydrogen leakage monitoring method, belongs to the technical field of hydrogen storage equipment, and solves the problem that hydrogen leakage is not easy to detect in the prior art. The invention provides a gas cylinder with a hydrogen leakage monitoring function, which comprises a liner, a cylinder opening sealing unit and a hydrogen leakage monitoring assembly, wherein the liner is provided with a cylinder opening; the bottle mouth sealing unit comprises an inner cover and an outer ring; the bottle mouth of the inner container is arranged between the inner cover and the outer ring; the inner cover is fixedly connected with the outer ring through bolts; the hydrogen leakage monitoring assembly is installed in the inner cover. The invention realizes the hydrogen leakage monitoring and has the advantages of simple and convenient operation and low cost.

Description

Gas cylinder with hydrogen leakage monitoring function and hydrogen leakage monitoring method

Technical Field

The invention relates to the technical field of hydrogen storage equipment, in particular to a gas cylinder with a hydrogen leakage monitoring function and a hydrogen leakage monitoring method.

Background

The gas cylinder wound by the plastic inner container has the characteristics of corrosion resistance, light weight and high strength, and has a good development prospect.

However, compared with a pure metal or metal lining gas cylinder, the tightness of the gas cylinder with the plastic liner is guaranteed more rigorously, mainly because the plastic liner and the metal end are made of different materials, and the sealing performance is reduced due to the connection looseness and the aging of a sealing element between the plastic liner and the metal end in the repeated use process.

Therefore, hydrogen is easy to leak, and when the hydrogen leaks, the hydrogen leakage has the problem that no detection device is arranged and the hydrogen leakage is not easy to detect.

Disclosure of Invention

In view of the foregoing analysis, embodiments of the present invention provide a gas cylinder with a hydrogen leakage monitoring function and a method for monitoring hydrogen leakage, so as to solve the problem that the existing hydrogen leakage cannot be detected.

The invention provides a gas cylinder with a hydrogen leakage monitoring function, which comprises a liner, a cylinder opening sealing unit and a hydrogen leakage monitoring assembly, wherein the liner is provided with a cylinder opening;

the bottle mouth sealing unit comprises an inner cover and an outer ring;

the bottle mouth of the inner container is arranged between the inner cover and the outer ring;

the inner cover is fixedly connected with the outer ring through bolts;

the hydrogen leakage monitoring assembly is installed in the inner cover.

Further, the hydrogen leakage monitoring assembly is provided with colored liquid.

Further, the gas cylinder also comprises a sealing assembly.

Further, the seal assembly includes a first seal ring.

Further, the seal assembly also includes a second seal ring.

Further, the inner lid includes a color development window.

Further, the inner cap further includes a first annular gasket and a second annular gasket.

Further, the outer race includes a sealing platform.

Further, the gas cylinder also comprises a winding layer.

The invention also provides a method for monitoring hydrogen leakage, which comprises the following steps:

step 1: installing the gas cylinder;

step 2: connecting a photoelectric detector at the color development window;

and 3, step 3: the photoelectric detector monitors whether hydrogen leaks or not and transmits the monitoring result to the control system.

Further, the hydrogen leakage monitoring assembly comprises a diffusion surface, a pinhole and a cylinder body.

Further, the cylinder is provided with a piston.

Further, the piston is pushed to move upwards by leaked hydrogen, and the piston presses the colored liquid to flow into the diffusion surface through the needle hole.

Further, the inner container bottle mouth comprises an inner side annular platform and an outer side annular platform, and the outer side annular platform is higher than the inner side annular platform.

Further, the inner cap further includes a first annular gasket and a second annular gasket, the second annular gasket being larger than the first annular gasket, the first annular gasket being inside the second annular gasket.

Further, the outer race includes a third annular gasket and a sealing land, the third annular gasket being higher than the sealing land.

Further, the outer ring is tightly attached to the outer side of the inner container bottle mouth, the third annular gasket is tightly abutted to the inner cover, the sealing platform is arranged between the third annular gasket and the outer annular platform, and the second sealing ring is arranged on the sealing platform to form a second airtight space.

Further, a first airtight space is formed between the inner container bottle mouth and the inner cover through the first sealing ring.

Compared with the prior art, the invention can realize at least one of the following beneficial effects:

1) the invention provides a safety scheme for monitoring the whole service life of a bottle mouth connection structure aiming at the possible leakage risk of a gas bottle.

2) According to the hydrogen leakage monitoring scheme provided by the invention, the second airtight space is constructed, so that the energy of the leakage monitoring device is completely derived from the pressure change of the second airtight space caused by leakage, power supply is not required, the implementation is easy, the cost is low, and no selectivity is provided for the loading content of the gas cylinder.

3) According to the hydrogen leakage monitoring scheme provided by the invention, the bottle mouth part is divided into the detachable inner cover and the permanently fixed outer ring according to the bearing function decomposition, the sealing function is planned on the inner walls of the inner cover and the inner container, and the leakage risk caused by the subsequent branch of the leakage path is reduced at the foremost end of the leakage path of the four-type bottle; meanwhile, the detachable inner cover ensures that the easily damaged part of the gas cylinder has good maintainability and replaceability in the life cycle, the outer ring serves as a fixing base of the inner cover to take the functions of connection and fixation with other parts of the gas cylinder, and the permanent fixing design ensures that the outer ring is more stably connected with the body of the gas cylinder; in addition, because inner cup split design can realize inner bag and inner cup, outer lane separation production, realizes firmly centre gripping installation to the inner bag bottleneck through follow-up equipment, compares with welding and embedding injection moulding production, and production simple process, the reliability is high.

In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

FIG. 1 is a top view of the gas cylinder mouthpiece apparatus of the present invention;

FIG. 2 is an exploded view of the gas cylinder mouthpiece apparatus of the present invention;

FIG. 3 is a schematic view of the structure of the liner of the present invention;

FIG. 4 is a cross-sectional view of the gas cylinder mouthpiece apparatus of the present invention;

FIG. 5 is an enlarged view taken at A in FIG. 4;

FIG. 6 is a schematic view of the construction of the inner lid of the present invention;

FIG. 7 is a schematic structural view of the metal outer ring of the present invention;

fig. 8 is a schematic flow chart of hydrogen leakage monitoring.

Reference numerals:

1-inner container; 11-an inner annular platform; 12-an outer annular platform; 2-a bottle mouth sealing unit; 21-inner cover; 211-a color development window; 212-first bolt hole; 213-a first annular gasket; 214-a second annular gasket; 215-a vent; 22-an outer ring; 221-a third annular gasket; 222-a sealing platform; 223-second bolt hole; 3-a winding layer; 4-a sealing assembly; 41-a first sealing ring; 42-a second seal ring; 5-hydrogen leakage monitoring assembly; 51-a diffusion surface; 52-pinhole; 53-cylinder body; 531-colored liquid; 532-piston.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.

Example 1

The invention discloses a specific embodiment of a gas cylinder with a hydrogen leakage monitoring function, which comprises a liner 1, a bottle mouth sealing unit 2 and a winding layer 3, wherein the bottle mouth sealing unit 2 is installed at the bottle mouth of the liner 1, the bottle mouth sealing unit 2 comprises an inner cover 21 and an outer ring 22, the inner cover 21 is attached to the inner part of the bottle mouth of the liner 1, the outer ring 22 is attached to the outer side of the bottle mouth of the liner 1, the inner cover 21 is fixedly connected with the outer ring 22 through bolts, the outer part of the outer ring 22 is wound and fixed by the winding layer 3, and the outer ring 22 provides a supporting function for the winding layer 3.

In the embodiment, the inner cover 21 and the opening of the inner container 1 are detachably mounted, which is beneficial to the maintenance and replacement of the gas cylinder; the outer ring 22 is fixed with the opening of the inner container 1, the outer ring 22 is connected with the body of the gas cylinder more stably by the design, and the outer ring 22 and the inner cover 21 are used for holding and installing the opening of the inner container 1, so that the gas tightness and firmness of the opening of the gas cylinder are enhanced by the structure; the inner cover 21 and the outer ring 22 are detachably connected, so that the bottle opening sealing unit 2 is conveniently separated and produced, the production process is simple, the reliability is high, and meanwhile, the problem that the bottle opening sealing unit 2 and the bottle opening of the liner 1 are subjected to rigidity discontinuity and cracks are generated is avoided.

Further, the outer ring 22 is annularly attached to the outer side of the plastic liner 1, and the outer ring 22 can be a single piece and is integrally sleeved on the bottle mouth of the liner 1; preferably, the outer ring 22 may be a ring formed by multiple segments, in this embodiment, the outer ring 22 is formed by two segments, the two segments are fixedly connected to each other, the two segments are formed into a ring shape and attached to the bottle mouth of the inner container 1, and the multiple segments of the outer ring 22 are favorable for assembly and disassembly, and have better tightness.

Further, the winding layer 3 is made of carbon fiber, glass fiber or the like, and preferably, a fiber impregnated with resin or a thread is used to wind the plastic liner to manufacture the fiber.

It should be noted that the gas cylinder with the hydrogen leakage monitoring function provided by the invention further comprises a hydrogen leakage monitoring assembly 5, and the hydrogen leakage monitoring assembly 5 is installed in the inner cover 21.

In this embodiment, when hydrogen takes place to reveal, atmospheric pressure increase, hydrogen reveals monitoring subassembly 5 can reveal the suggestion afterwards to in order to monitor the hydrogen condition of revealing, thereby improve the security that the gas cylinder used, hydrogen reveals monitoring subassembly 5 and utilizes the hydrogen to reveal the pressure differential that arouses, need not to supply power, easily implement, with low costs and the reliability is high, is adapted to the gas cylinder of different hydrogen.

It should be noted that the hydrogen leakage monitoring unit 5 includes a diffusion surface 51, a pinhole 52, and a cylinder 53, wherein the pinhole 52 connects the diffusion surface 51 and the cylinder 53, the size of the diffusion surface 51 and the cylinder 53 is larger than the size of the pinhole 52, and the size of the diffusion surface 51 is larger than the size of the cylinder 53.

Further, the cylinder 53 is provided with a colored liquid 531 and a plunger 532, the colored liquid 531 is above the plunger 532, and the colored liquid 531 communicates with the needle hole 52.

In this embodiment, the pressure generated by the leaked hydrogen pushes the piston 532 to move upward, the piston 532 extrudes the colored liquid 531, the colored liquid 531 flows into the diffusion surface 51 through the pinhole 52, the color of the colored liquid 531 is monitored, that is, the leakage of hydrogen is prompted, and the process is simple, rapid and reliable; the hydrogen leakage monitoring component 5 only uses the pressure generated by leaked hydrogen as energy (power supply is not needed, and chemical agent/chemical reaction is not needed) to push the colored liquid 531 to flow into the diffusion surface 51, the color can be observed in the diffusion surface 51, and the hydrogen leakage is prompted.

Further, the colored liquid 531 may be a fluid or semi-fluid, such as: mineral grease, or the use of magnetic fluid, and a magnetic plunger, ensures that under normal inversion and vibration conditions, the colored fluid 531 will not flow through the pinhole 52 into the diffusion surface 51 and cause false monitoring.

Further, the inner cover 21 includes a color development window 211, the hydrogen leakage monitoring assembly 5 is installed in the color development window 211, and the color development window 211 observes the colored liquid 531 on the diffusion surface 51 in the hydrogen leakage monitoring assembly 5, that is, the colored liquid 531 can be directly monitored through the color development window 211.

It should be noted that the gas cylinder with the hydrogen leakage monitoring function provided by the invention further comprises a sealing assembly 4, and the sealing assembly 4 comprises a first sealing ring 41 and a second sealing ring 42.

Further, the bottle mouth of the liner 1 comprises an inner annular platform 11 and an outer annular platform 12, and the outer annular platform 12 is higher than the inner annular platform 11.

Further, the inner lid 21 also includes a first annular gasket 213 and a second annular gasket 214, the second annular gasket 214 being larger in size than the first annular gasket 213, the first annular gasket 213 being inside the second annular gasket 214.

In this embodiment, the first annular gasket 213 is closely fitted to the inner annular platform 11, and the first sealing ring 41 is disposed in the fit between the first annular gasket 213 and the inner annular platform 11 to form a first airtight space, so as to prevent hydrogen from leaking and reinforce the sealing structure; the outboard annular land 12 is in close abutment with the second annular gasket 214.

It should be noted that the outer ring 22 includes a third annular gasket 221 and a sealing land 222, and the third annular gasket 221 is higher than the sealing land 222.

In this embodiment, the outer ring 22 is tightly attached to the outer side of the opening of the inner container 1, the third annular gasket 221 is tightly abutted to the inner cover 21, the sealing platform 222 is located between the third annular gasket 221 and the outer annular platform 12, and the second sealing ring 42 is placed on the sealing platform 222 to form a second airtight space and enhance the airtight structure.

Further, the first airtight space that forms through first sealing washer 41 between inner bag 1 bottleneck and the inner cup 21, the inner bag 1 bottleneck, form second airtight space through second sealing washer 42 between inner cup 21 and the outer lane 22, hydrogen reveals monitoring subassembly 5 and second airtight space intercommunication, when hydrogen in the gas cylinder takes place to reveal from first airtight space, the atmospheric pressure in second airtight space risees, hydrogen promotes piston 532 upward movement this moment, and then promote coloured liquid 531 and flow into diffusion surface 51, can monitor hydrogen through color development window 211 and take place to reveal, this process is simple swift, easy to implement, the reliability is high and with low costs.

And moreover, the first airtight space and the second airtight space are constructed, so that the air tightness of the air bottle is enhanced, and the dual-guarantee effect is achieved.

Preferably, the number of the first sealing rings 41 in the first airtight space can be 1 or more, and the first sealing rings are used for isolating the high-pressure hydrogen leakage in the gas cylinder.

It should be noted that the inner lid 21 further includes a first bolt hole 212, and the outer ring 22 includes a second bolt hole 223.

In this embodiment, the inner cover 21 and the outer ring 22 pass through the first bolt hole 212 and the second bolt hole 223 through bolts to be fixedly connected, the inner cover 21 and the outer ring 22 are fixedly connected, and the bottle opening of the inner container 1 is wrapped, so that the whole device is more stable.

It should be noted that the inner cover further includes a vent hole 215, and the gas cylinder realizes the input and output functions of hydrogen through the vent hole 215.

The structural principle of the invention is as follows:

attaching the outer ring 22 of the invention to the mouth of the liner 1, placing the first sealing ring 41 on the inner annular platform, and placing the second sealing ring 42 on the sealing platform 222; the hydrogen leakage monitoring module 5 is placed inside the color development window 211 of the inner lid 21; covering the inner cover 21 on the bottle mouth of the inner container 1; fixedly connecting the inner cover 21 with the outer ring 22 through bolts; finally, the resin impregnated fiber or silk thread is wound outside the outer ring 22 to form a winding layer 3 as an appearance protective layer of the gas cylinder.

Carry out double-deck guarantee to compound gas cylinder through first sealing washer 41 and second sealing washer 42, when hydrogen takes place to reveal in the compound gas cylinder, enter into the second airtight space through first airtight space in, because of hydrogen reveals monitoring subassembly 5 and second airtight space intercommunication, the hydrogen of revealing promptly enters into the second airtight space in, atmospheric pressure increases, promotes piston 532 upward movement, and then promotes coloured liquid 531 and enters into diffusion plane 51, can monitor through chromogenic window 211 whether hydrogen leaks.

Example 2

The present invention provides a method for hydrogen leakage monitoring according to embodiment 1, including the steps of:

step 1: installing the gas cylinder of example 1;

step 2: a photodetector is connected at the color development window 211;

and step 3: the photoelectric detector monitors whether hydrogen leaks or not and transmits a monitoring result to the control system.

In step 1, the outer ring 22 is attached to the mouth of the liner 1, the first sealing ring 41 is placed on the inner annular platform, and the second sealing ring 42 is placed on the sealing platform 222; the hydrogen leakage monitoring module 5 is placed inside the color development window 211 of the inner lid 21; covering the inner cover 21 on the bottle mouth of the inner container 1; fixedly connecting the inner cover 21 with the outer ring 22 through bolts; finally, the resin impregnated fiber or silk thread is wound outside the outer ring 22 to form a winding layer 3 as an appearance protective layer of the gas cylinder.

In step 2, a photodetector is connected to the color development window 211, and the photodetector monitors whether hydrogen gas leaks all day long.

In step 3, a photodetector (e.g., a reflective optical coupler) is connected to the color development window 211 via a flange, for example, when the colored liquid is black magnetic liquid, and when hydrogen does not leak, the diffusion surface 51 is white, and the signal feedback of the photodetector is "0"; when hydrogen leaks, black magnetic liquid is squeezed to the diffusion surface 51 by air pressure, the diffusion surface 51 is changed from white to black, the color is monitored by the color development window 211, the signal feedback of the photoelectric detector is '1', signal numbers are transmitted to the control system by the interface circuit through the CAN bus, and the control system controls and monitors the working state of each gas cylinder.

The invention has the following beneficial effects:

1. the invention provides a safety scheme for monitoring the whole service life of a bottle mouth connection structure aiming at the possible leakage risk of gas; through constructing the second airtight space, the energy of the hydrogen leakage monitoring device 5 completely comes from the pressure change of the second airtight space caused by leakage, the power supply is not needed, the implementation is easy, the cost is low, and the selectivity to the loading content of the gas cylinder is avoided.

2. The bottle mouth part is divided into a detachable inner cover 21 and a permanently fixed outer ring 22 according to the bearing function decomposition, the sealing function is planned on the inner cover 21 and the inner wall of the inner container 1, and the leakage risk caused by the subsequent branch of the leakage path is reduced at the foremost end of the leakage path of the four-type bottle; meanwhile, the detachable inner cover 21 ensures that the quick-wear part of the gas cylinder has good maintainability and replaceability in the life cycle; the outer ring 22 serves as a fixing base of the inner cover 21 to be connected and fixed with other parts of the gas cylinder, and the permanent fixing design enables the outer ring to be connected with the body of the gas cylinder more stably.

3. Due to the detachable design of the inner cover 21 and the outer ring 22, the inner container 1 can be separated from the inner cover 21 and the outer ring 22, the bottle mouth of the inner container 1 can be firmly clamped and installed through subsequent assembly, and compared with welding and embedded injection molding production, the production process is simple and the reliability is high.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. A gas cylinder with a hydrogen leakage monitoring function is characterized by comprising a liner (1), a bottle opening sealing unit (2) and a hydrogen leakage monitoring component (5);

the bottle mouth sealing unit (2) comprises an inner cover (21) and an outer ring (22);

the bottle mouth of the inner container (1) is arranged between the inner cover (21) and the outer ring (22);

the hydrogen leakage monitoring assembly (5) is mounted in the inner cover (21).

2. A gas cylinder with hydrogen gas leakage monitoring function according to claim 1, characterized in that the hydrogen gas leakage monitoring component (5) is provided with a colored liquid (531).

3. A gas cylinder with hydrogen gas leakage monitoring function according to claim 2, characterized in that the gas cylinder further comprises a sealing assembly (4).

4. A gas cylinder with hydrogen leakage monitoring function according to claim 3, characterized in that the sealing assembly (4) comprises a first sealing ring (41).

5. A gas cylinder with hydrogen gas leakage monitoring function according to claim 4, characterized in that the sealing assembly (4) further comprises a second sealing ring (42).

6. A gas cylinder with hydrogen gas leakage monitoring function according to claim 5, characterized in that the inner cover (21) includes a color development window (211).

7. A gas cylinder with hydrogen gas leakage monitoring function according to claim 6, characterized in that the inner cover (21) further comprises a first annular gasket (213) and a second annular gasket (214).

8. A gas cylinder with hydrogen gas leakage monitoring function according to claim 7, characterized in that the outer ring (22) comprises a sealing platform (222).

9. A gas cylinder with hydrogen gas leakage monitoring function according to claim 9, characterized in that the gas cylinder further comprises a wrapping layer (3).

10. A method of hydrogen leak monitoring, comprising the steps of:

step 1: installing the gas cylinder of claims 1-9;

step 2: connecting a photodetector at the color development window (211);