CN114877242B

CN114877242B - Gas cylinder with hydrogen leakage monitoring function and hydrogen leakage monitoring method

Info

Publication number: CN114877242B
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: 2024-05-28
Anticipated expiration: 2041-02-05
Also published as: CN114877242A

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 bottleneck sealing unit and a hydrogen leakage monitoring assembly; 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 mounted within the inner cap. The invention realizes the effects of hydrogen leakage monitoring, simple 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 liner has the characteristics of corrosion resistance, light weight and high strength, and has good development prospect.

However, compared with a pure metal or metal liner gas cylinder, the plastic liner gas cylinder has more severe guarantee of tightness, and the main reason is that the plastic liner and the metal end are made of different materials, and in the repeated use process, the connection between the plastic liner and the metal end is loose and the sealing element is aged, so that the sealing performance is reduced.

Thus, the hydrogen gas is likely to leak, and there is a problem that no detection device is provided and it is not easy to detect the hydrogen gas when the hydrogen gas leaks.

Disclosure of Invention

In view of the above analysis, the present invention aims to provide a gas cylinder with a hydrogen leakage monitoring function and a method for monitoring hydrogen leakage, which are used for solving the problem that the existing hydrogen leakage is not detected.

The invention provides a gas cylinder with a hydrogen leakage monitoring function, which comprises a liner, a bottleneck sealing unit and a hydrogen leakage monitoring assembly;

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 a colored liquid.

Further, the cylinder also includes a seal assembly.

Further, the seal assembly includes a first seal ring.

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

Further, the inner cover 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: a photoelectric detector is connected at the color development window;

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

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

Further, the cylinder is provided with a piston.

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

Further, the liner neck comprises an inner annular platform and an outer annular platform, wherein the outer annular platform is higher than the inner 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 ring includes a third annular gasket and a sealing platform, the third annular gasket being higher than the sealing platform.

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

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

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

1) The invention provides a safety scheme for full-life monitoring aiming at a bottle mouth connection structure of a gas cylinder, wherein the bottle mouth connection structure is likely to have leakage and split risks.

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 needed, the implementation is easy, the cost is low, and the loading content of the gas cylinder is not selective.

3) According to the hydrogen leakage monitoring scheme, 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 branching of the leakage passage is reduced at the forefront end of the leakage passage of the four-type bottle; meanwhile, the detachable inner cover ensures that the vulnerable part of the gas cylinder has good maintainability and replaceability in the life cycle, the outer ring serving as a fixed foundation of the inner cover bears the functions of connecting and fixing other parts of the gas cylinder, and the permanent fixation design ensures that the gas cylinder is connected with the cylinder body of the gas cylinder more firmly; in addition, because the inner cup split design can realize inner bag and inner cup, outer lane separation production, realize firmly the centre gripping installation to the inner cup bottle mouth through subsequent equipment, compare with welding and embedding injection molding production, production simple process, the reliability is high.

In the invention, the technical schemes can be mutually combined 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 may 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, like reference numerals being used to designate like parts throughout the drawings;

FIG. 1 is a top view of a cylinder neck finish assembly of the present invention;

FIG. 2 is an exploded view of the cylinder neck finish assembly 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 cylinder neck finish of the present invention;

FIG. 5 is an enlarged view of FIG. 4 at A;

FIG. 6 is a schematic view of the structure of the inner cap of the present invention;

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

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

Reference numerals:

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

Detailed Description

The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.

Example 1

1-8, The invention discloses a gas cylinder with a hydrogen leakage monitoring function, which comprises a liner 1, a bottle opening sealing unit 2 and a winding layer 3, wherein the bottle opening of the liner 1 is provided with the bottle opening sealing unit 2, the bottle opening sealing unit 2 comprises an inner cover 21 and an outer ring 22, the inner cover 21 is mounted in a fit manner with the inner part of the bottle opening of the liner 1, the outer ring 22 is mounted in a fit manner with the outer side of the bottle opening 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 is detachably arranged with the bottle mouth of the inner container 1, which is beneficial to the maintenance and replacement of the gas cylinder; the outer ring 22 is fixed with the bottle mouth of the inner container 1, the design ensures that the outer ring 22 is more firmly connected with the bottle body of the gas bottle, and the outer ring 22 and the inner cover 21 are additionally provided with the bottle mouth of the inner container 1, so that the structure enhances the air tightness and the firmness of the bottle mouth of the gas bottle; the inner cover 21 is detachably connected with the outer ring 22 so as to facilitate the separation production of the bottle mouth sealing unit 2, the production process is simple, the reliability is high, and meanwhile, the problem that the bottle mouth sealing unit 2 and the bottle mouth of the liner 1 are discontinuous in rigidity and crack is caused by integral molding is avoided.

Further, the outer ring 22 is mounted in an annular fit with the outer side of the plastic liner 1, the outer ring 22 can be a single piece, and the whole body is sleeved on the bottle mouth of the liner 1; preferably, the outer ring 22 can be annular for the multistage constitution, and in this embodiment, the outer ring 22 comprises two sections, fixed connection between the two sections, with two sections constitution annular laminating in inner bag 1 bottleneck, the multistage structure of outer ring 22 is favorable to the installation to dismantle, and the compactness is better.

Further, the wrapping layer 3 is made of carbon fiber, glass fiber or the like, and preferably a fiber or yarn impregnated with resin is used to wrap the plastic inner liner to manufacture the fiber.

It should be noted that, the gas cylinder with the hydrogen leakage monitoring function provided by the present invention further includes 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 increases, and then hydrogen reveals the suggestion can be revealed to hydrogen and reveal the monitoring module 5 to the condition is revealed to the control hydrogen, thereby improves the security that the gas cylinder used, and hydrogen reveals the pressure differential that monitoring module 5 utilized hydrogen to reveal to arouse, need not to carry out power supply, easy implementation, with low costs and reliability height, is adapted to the gas cylinder of different hydrogen.

The hydrogen leakage monitoring module 5 includes a diffusion surface 51, a pinhole 52, and a cylinder 53, wherein the pinhole 52 communicates the diffusion surface 51 and the cylinder 53, and the diffusion surface 51 and the cylinder 53 have a size larger than the pinhole 52 and the diffusion surface 51 has a size larger than the cylinder 53.

Further, the cylinder 53 is provided with a colored liquid 532 and a piston 531, the colored liquid 532 being above the piston 531, the colored liquid 532 being in communication with the needle hole 52.

In this embodiment, the pressure generated by the leaked hydrogen pushes the piston 531 to move upwards, the piston 531 extrudes the colored liquid 532, the colored liquid 532 flows into the diffusion surface 51 through the pinhole 52, the color of the colored liquid 532 is monitored, that is, the leakage of hydrogen is prompted, and the process is simple, fast and reliable; the hydrogen leakage monitoring assembly 5 only uses the pressure generated by the leaked hydrogen as energy (no power supply and no chemical agent/chemical reaction are needed) to push the colored liquid 532 to flow into the diffusion surface 51, the color can be observed in the diffusion surface 51, the hydrogen leakage is prompted, the assembly is simple and easy to operate, no energy consumption is needed, and the installation is simple and convenient.

Further, colored liquid 532 may be a fluid or semi-fluid, such as: mineral grease, or the use of a magnetic fluid, and a piston with magnetic properties, ensures that the colored fluid 532 does not flow through the pinholes 52 into the diffusing surface 51 under normal inversion and vibration conditions, etc., causing false monitoring.

Further, the inner cap 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 532 of the diffusion surface 51 in the hydrogen leakage monitoring assembly 5, i.e. the colored liquid 532 can be monitored directly through the color development window 211.

It should be noted that, the gas cylinder with the hydrogen leakage monitoring function provided by the present invention further includes a sealing assembly 4, and the sealing assembly 4 includes 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 cap 21 further 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 tightly fitted with the inner annular platform 11, and the first seal ring 41 is placed in the first annular gasket 213 and the inner annular platform 11 to form a first airtight space, so as to prevent leakage of hydrogen and strengthen the sealing structure; the outer annular platform 12 is in close abutment with the second annular gasket 214.

The outer ring 22 includes a third ring gasket 221 and a sealing platform 222, and the third ring gasket 221 is higher than the sealing platform 222.

In this embodiment, the outer ring 22 is tightly attached to the outer side of the bottle mouth of the liner 1, the third annular gasket 221 is tightly abutted to the inner cap 21, the sealing platform 222 is 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, so as to enhance the airtight structure.

Further, a first airtight space is formed between the bottle mouth of the inner container 1 and the inner cover 21 through the first sealing ring 41, a second airtight space is formed between the bottle mouth of the inner container 1, the inner cover 21 and the outer ring 22 through the second sealing ring 42, the hydrogen leakage monitoring assembly 5 is communicated with the second airtight space, when the hydrogen in the gas cylinder leaks from the first airtight space, the air pressure of the second airtight space is increased, at the moment, the hydrogen pushes the piston 531 to move upwards, the colored liquid 532 is pushed to flow into the diffusion surface 51, the leakage of the hydrogen can be monitored through the color development window 211, and the process is simple, rapid, easy to implement, high in reliability and low in cost.

And the first airtight space and the second airtight space are constructed, so that the air tightness of the air cylinder 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, so as to isolate high-pressure hydrogen leakage in the gas cylinder.

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 for fixed connection, and the inner cover 21 and the outer ring 22 are fixedly connected to wrap the bottle mouth of the liner 1, so that the whole device is more stable.

It should be noted that the inner cover further includes a vent 215, and the gas cylinder realizes the function of inputting and outputting hydrogen through the vent 215.

The invention has the structural principle that:

attaching the outer ring 22 of the invention to the bottle mouth of the liner 1, placing the first sealing ring 41 at the inner annular platform, and placing the second sealing ring 42 on the sealing platform 222; the hydrogen leakage monitoring assembly 5 is placed inside the color development window 211 of the inner cap 21; the inner cover 21 is covered on the bottle mouth of the inner container 1; fixedly connecting the inner cover 21 and the outer ring 22 through bolts; finally, the resin-impregnated fiber or wire is wound on the outer part of the outer ring 22 to form a winding layer 3 which is used as an appearance protection layer of the gas cylinder.

Double-deck guarantee is carried out to compound gas cylinder through first sealing washer 41 and second sealing washer 42, when hydrogen takes place to reveal in compound gas cylinder, enter into in the second airtight space through first airtight space, because of hydrogen reveal monitoring module 5 and second airtight space intercommunication, the hydrogen that leaks enters into in the second airtight space promptly, the atmospheric pressure increases, promote piston 531 upward movement, and then promote colored liquid 532 to enter into diffusion surface 51, can monitor whether hydrogen leaks through the color development window 211.

Example 2

The invention provides a hydrogen leakage monitoring method according to an embodiment 1, comprising the following steps:

step 1: installing the gas cylinder in example 1;

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

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

In step 1, the outer ring 22 is attached to the bottle mouth of the liner 1, the first sealing ring 41 is placed at the inner annular platform, and the second sealing ring 42 is placed on the sealing platform 222; the hydrogen leakage monitoring assembly 5 is placed inside the color development window 211 of the inner cap 21; the inner cover 21 is covered on the bottle mouth of the inner container 1; fixedly connecting the inner cover 21 and the outer ring 22 through bolts; finally, the resin-impregnated fiber or wire is wound on the outer part of the outer ring 22 to form a winding layer 3 which is used as an appearance protection layer of the gas cylinder.

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

In step 3, a photodetector (e.g., a reflective optocoupler) is connected at the color development window 211 through a flange, for example, when the colored liquid is a black magnetic liquid, and when the hydrogen is not leaked, the diffusion surface 51 is white, and the signal feedback of the photodetector is "0"; when hydrogen leaks, the black magnetic liquid is extruded to the diffusion surface 51 by air pressure, the diffusion surface 51 is changed from white to black, the color development window 211 monitors black, the signal feedback of the photoelectric detector is 1, the signal number is 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 beneficial effects of the invention are as follows:

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

2. According to the bearing function decomposition, the bottle mouth part is divided into a detachable inner cover 21 and a permanently fixed outer ring 22, the sealing function is planned on the inner walls of the inner cover 21 and the inner container 1, and the leakage risk caused by the subsequent branch of the leakage passage is reduced at the forefront end of the four-type bottle leakage passage; meanwhile, the detachable inner cover 21 ensures that the vulnerable 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 play a role of connecting and fixing other parts of the gas cylinder, and the permanent fixing design ensures that the gas cylinder is connected with the body of the gas cylinder more firmly.

3. The detachable design of the inner cover 21 and the outer ring 22 can realize the separation production of the inner container 1, the inner cover 21 and the outer ring 22, and the firm clamping and installation of the bottle mouth of the inner container 1 are realized through the subsequent assembly.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims

1. The gas cylinder with the hydrogen leakage monitoring function is characterized by comprising a liner (1), a bottleneck sealing unit (2) and a hydrogen leakage monitoring assembly (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 inner cover (21), the bottle mouth of the inner container (1) and the outer ring (22) are sequentially arranged from inside to outside along the radial direction of the inner container (1);

The hydrogen leakage monitoring assembly (5) is arranged in the inner cover (21);

A second sealing space is formed among the inner cover (21), the bottle mouth of the inner container (1) and the outer ring (22), and the hydrogen leakage monitoring assembly (5) is communicated with the second sealing space;

The hydrogen leakage monitoring assembly (5) comprises a diffusion surface (51), a pinhole (52) and a cylinder (53), wherein the pinhole (52) is communicated with the diffusion surface (51) and the cylinder (53);

A colored liquid (532) and a piston (531) are arranged in the cylinder body (53), and the colored liquid (532) is communicated with the needle hole (52);

The pressure generated by the leaked hydrogen can push the piston (531) to press the colored liquid (532) so that the colored liquid (532) flows into the diffusion surface (51) through the pinholes (52);

the inner cap (21) comprises a color development window (211), through which color development window (211) a colored liquid (532) in the diffusion surface (51) can be monitored.

2. A gas cylinder with hydrogen leakage monitoring function according to claim 1, characterized in that the gas cylinder further comprises a sealing assembly (4).

3. A gas cylinder with hydrogen leakage monitoring function according to claim 2, characterized in that the sealing assembly (4) comprises a first sealing ring (41).

4. A gas cylinder with hydrogen leakage monitoring function according to claim 3, characterized in that the sealing assembly (4) further comprises a second sealing ring (42).

5. The gas cylinder with hydrogen leakage monitoring function according to claim 4, wherein the inner cap (21) further comprises a first annular gasket (213) and a second annular gasket (214).

6. The gas cylinder with hydrogen leakage monitoring function according to claim 5, wherein the outer ring (22) comprises a sealing platform (222).

7. A gas cylinder with hydrogen leakage monitoring function according to claim 1, characterized in that the gas cylinder further comprises a wrapping layer (3).

8. A method of hydrogen leak monitoring comprising the steps of:

Step 1: installing a gas cylinder according to any one of claims 1 to 7;

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