BE1030269B1 - TYPE III 70 MPA HYDROGEN PRESSURE VESSEL FOR GAS STATION AND PROCESSING METHOD THEREOF - Google Patents

Abstract

The present invention relates to a hydrogen cylinder, in particular a 70 MPa type III hydrogen pressure vessel for gas filling stations, and a processing method therefor. The 70MPa Type III Hydrogen Pressure Vessel for Gas Station includes an inner container, a carbon fiber wrapping layer and a fiberglass protective layer, the carbon fiber wrapping layer is jacketed outside the inner container, and the fiberglass protective layer is jacketed outside the carbon fiber wrapping layer, wherein a wall thickness of a central part of the inner container is greater than or equal to 10 mm and a wall thickness of both ends of the inner container is larger than that of the central part of the inner container; at least one end of the inner container is provided with an opening and fixed with an opening extension, the opening extension is aligned with the opening, is tubular and penetrates the carbon fiber wrap layer and a glass confining layer; a closure plug is detachably connected in the opening extension, a sealing ring is arranged between the closure plug and the opening extension, a bracket is pushed onto the opening extension, and the bracket is opposite the closure plug. The Type III 70MPa hydrogen pressure vessel can be adjusted to a working pressure of 70MPa and above, improving the effect of hydrogen storage.

Description

_ ; _ BE2023/5215 70 MPA HYDROGEN PRESSURE VESSEL TYPE III FOR GAS STATION AND

PROCESSING METHODS FOR THIS

TECHNICAL FIELD

The present invention relates to a hydrogen bottle, in particular a 70 MPa

Type III hydrogen pressure vessel for gas filling stations and a processing method therefor.

STATE OF THE ART

When hydrogen is burned, only water vapor is produced, which means...

Environmental pollution is effectively reduced, which is why hydrogen is widely used in the automotive industry and other fields. Hydrogen pressure vessels are mainly used for

used to store hydrogen. In order to increase the storage capacity, the pressure in the hydrogen pressure vessels is higher than atmospheric pressure, so the requirements for the hydrogen pressure vessels are higher. Currently, there are many types of hydrogen pressure vessels, of which the hydrogen pressure vessels type Ill have an inner container and a

Carbon fiber wrap layer included, with the inner containers having openings and

Sealing plugs are provided and the sealing plugs close the openings.

However, the conventional Type III hydrogen pressure vessel can only adapt to one

Adjust the working pressure of 20-70 MPa, and the storage capacity of the hydrogen

Type Ill pressure vessel is insufficient. When used, the gas station requires more

Hydrogen pressure vessel when the storage capacity of each hydrogen pressure vessel is small, which undoubtedly greatly increases the cost of storing hydrogen, so

Hydrogen pressure vessels are needed that can adapt to higher working pressure to reduce the storage space required.

CONTENT OF THE PRESENT INVENTION

The object of the present invention is to provide a 70 MPa hydrogen pressure vessel

Type III for gas filling station and to propose a processing method for it in order to adapt to the

To adapt working pressure of 70 MPa and more and improve the effect of hydrogen storage.

The task is carried out by a 70 MPa Type Ill hydrogen pressure vessel

Gas station and a processing method for it solved. 70 MPa hydrogen pressure vessel of type III for gas filling station, characterized in that the pressure vessel has an inner container, a carbon fiber wrapping layer and a

Glass fiber protective layer includes, with the carbon fiber wrapping layer outside the

The inner container is covered and the fiberglass protective layer is outside the carbon fiber

Wrapping layer is covered, wherein a wall thickness of a central part of the inner container is greater than or equal to 10 mm and a wall thickness of both ends of the inner container is greater than that

° BE2023/5215 of the middle part of the inner container; at least one end of the inner container is with a

Opening provided and fixed with an opening extension, the opening extension is aligned with the opening, is tubular and penetrates the carbon fiber wrap layer and a glass confining layer; a sealing plug is detachably connected in the opening extension, a sealing ring is between the sealing plug and the

Opening extension arranged, a bracket is pushed onto the opening extension, and the bracket is opposite the sealing plug.

In this way, advantages of the present invention are as follows:

According to the invention, the bracket is pushed onto the opening extension in order to

Limit opening extension. After the sealing plug and sealing ring are installed, the opening extension can be tightly attached to the sealing ring, improving the sealing effect. When the working pressure of the hydrogen pressure vessel is greater than or equal to 70 MPa, the hydrogen stored in the hydrogen pressure vessel does not leak, so that the hydrogen pressure vessel according to the invention

Can bear working pressure of more than 70Mpa or even 98-0Mpa.

The wall thickness of the middle part and the ends of the inner container is greater, so that the

Inner container has greater strength and can withstand higher working pressure.

However, the wall thickness of the ends of the inner container is greater than that of the middle part, so that the strength of the ends is greater than that of the inner container. Even if the opening is on the

Ends of the inner container are arranged, which does not have a major influence on the strength of the inner container, which ensures that the inner container can withstand a working pressure of over 70 MPa.

Preferably, a side wall of the bracket facing the inner container is trumpet-shaped and an end of the bracket facing the inner container is attached to the outer wall of the inner container.

In this way, advantages of the present invention are as follows: the contact area between the bracket and the inner container is larger, which can increase the restraining effect of the bracket on the end of the inner container, and the fastening of the end of the

The inner container and the end of the bracket can also play a role in determining the

Play installation of the bracket, which is convenient for installing the bracket.

Preferably, an outer wall of the bracket passes over, facing the end of the

Inner container, flowing into the outer wall of the inner container.

In this way, advantages of the present invention are as follows: the bracket does not bulge and hinder the winding of the carbon fiber, which is favorable for the processing of the carbon fiber winding layer.

Preferably, an end of the bracket facing the inner container is located between the carbon fiber wrapping layer and the inner container.

° BE2023/5215

In this way, advantages of the present invention are as follows: the carbon fiber

Wrapping layer can press the trumpet-shaped end of the bracket onto the inner container, which makes the bracket fixed and does not slip far away from the inner container.

The inner container preferably comprises a container body, a buffer part and a

End head part, wherein a wall thickness of the container body is more than or equal to 10 mm, one

Wall thickness of the end head part is greater than a wall thickness of the container body, and the

Wall thickness of the buffer part from an end near the container body to an end near the

End headboard gradually increases.

In this way, advantages of the present invention are as follows: the buffer part can be a

Solve the problem of stress concentration in the transition area, which is convenient for the processing and molding of the inner container and improves the performance of the inner container.

Preferably, a length of the buffer part is greater than or equal to 90 mm.

In this way, advantages of the present invention are as follows: the length of the buffer part is larger, making the buffer part solve the problem of stress concentration in the

Transition area can be solved better.

Preferably the wall thickness of the end head part increases from one end close to

Container body gradually closes to an end far away from the container body.

In this way, advantages of the present invention are as follows: the strength of the

End head part near the opening is larger, which in turn increases the strength of the

Inner container guaranteed.

Preferably, the thickness of the carbon fiber wrapping layer is greater than or equal to 35 mm.

In this way, advantages of the present invention are as follows: the carbon fiber

Wrapping layer can limit the inner container and also limit the working pressure of the hydrogen

Effectively improve the pressure vessel.

A Process for Processing the 70MPa Type Ill Hydrogen Pressure Vessel for

Gas station, comprising:

S1, pressing a metal pipe to form an inner container and pressing at least one end of the inner container to form an opening and an opening extension, wherein a wall thickness of a central part of the inner container during pressing is greater than or equal to 10 mm and a Wall thickness of both ends of the inner container is greater than that

Wall thickness of the middle part of the inner container is:

S2, wrapping the bracket at the opening extension, with one end of the bracket sticking to the outer wall of the inner container near the inner container;

S3, impregnating the carbon fiber with resin, winding the carbon fiber on the

Outer wall of the inner container to form a carbon fiber wrap layer having a thickness of 35 mm or more, and covering the carbon fiber wrap layer at one end of the

bracket near the inner container; and

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S4, winding glass fiber on the carbon fiber wrapping layer to create a glass fiber

To form a protective layer, with a thickness of the glass fiber protective layer being greater than or equal to 1.9 mm.

The method has the following advantages.

The hydrogen pressure vessel manufactured using this process can be adapted to a

Adjust working pressure of over 70MPa, store more hydrogen, is more suitable for

Places where a large amount of hydrogen needs to be stored, such as b.

gas filling stations, and to reduce storage costs. In this process, the bracket is first installed and then carbon fiber is used to wrap the bracket so that the formed

Carbon fiber wrap layer can be wrapped outside the temple to fix the temple and prevent the temple from slipping.

Preferably, after forming the opening extension by pressing in S1

Internal threads processed at the end of the opening extension far away from the inner container and the number of internal threads is greater than or equal to 18.

The method has the following advantages.

The opening extension is screwed to the sealing plug. If the

If the working pressure in the inner container exceeds 70 MPa, the connection between the

Opening extension and the sealing plug tighter so that the sealing plug can no longer come loose.

DRAWINGS

1 is a front view of a hydrogen pressure vessel in an embodiment of the present invention;

Figure 2 is an enlarged view of A in Figure 1;

Fig. 3 is an enlarged view of B in Fig. 1.

DETAILED DESCRIPTION

Various exemplary embodiments of the present are presented below

Invention described in detail.

Examples of embodiments

As shown in Figs. 1-3, a 70 MPa hydrogen gas according to the invention comprises

Type Ill pressure vessel for gas filling station, an inner container, a carbon fiber

wrapping layer 4 and a fiberglass protective layer; the inner container includes one

container body 1, two buffer parts 5 and two end head parts 6; the two end head parts 6 are located on both sides of the container body 1, the two buffer parts 5 are located between the container body 1 and the two end head parts 6, which are distant from the container body 1

Ends of the two end head parts 6 are both provided with openings, right ends of the

End head parts 6 are provided with an opening extension 2, and the opening extension 2

_ ° BE2023/5215 is aligned with the openings. In these exemplary embodiments, the container body 1 is

Buffer parts 5, the end head parts 6 and the opening extension 2 are all made of aluminum tubes

Pressing made so that the container body 1, the buffer parts 5, the end head parts 6 and the

Opening extension 2 are all firmly connected and coaxial. In these exemplary embodiments, the wall thickness of the container body is 1 10 mm, the wall thickness of the right ends of the

Buffer parts 5 is 13 mm, the length of the buffer parts 5 is 100 mm, the wall thickness of the

Buffer parts 5 gradually increases from left to right, and the wall thickness of the end head parts 6 also increases from left to right, therefore the wall thickness of the two end head parts 6 is larger than that of the container body 1.

The right end of the opening extension 2 is provided with an internal thread and connected to a sealing plug 7 via a thread. The number of threads of the

Closing plug 7 and the number of internal threads of the opening extension 2 are both more than 18. The left part of the closing plug 7 is provided with an annular groove 71, and a sealing ring is arranged in the annular groove 71. In this exemplary embodiment the

Sealing ring an O-shaped ring. The outer wall of the opening extension 2 is with a

Bracket 3 is covered, the bracket 3 is in a press fit with the opening extension 2, the right end of the bracket 3 is trumpet-shaped and abuts the ends of the end head parts 6, and the outer wall of the bracket 3 merges smoothly into the outer wall of the end head parts 6.

The carbon fiber wrap layer 4 is placed on the container body 1 and covers the container body 1, the buffer parts 5 and the end head parts 6. In this embodiment, the carbon fiber wrap layer 4 is made of T800 carbon fiber and the thickness of the

Carbon fiber wrap layer 4 is 40mm. Both ends of the carbon fiber

Wrapping layer 4 is placed on the bracket 3, and the ends of the bracket 3 are close to the

End head parts 6 is pressed onto the end head parts 6. The fiberglass protective layer is on the

Carbon fiber wrapping layer 4 is put over and the thickness of the glass fiber protective layer is 2 mm in this exemplary embodiment.

A Process for Processing the 70MPa Type Ill Hydrogen Pressure Vessel for

Gas station includes:

S1, pressing a metal tube to form an inner container and pressing at least one end of the inner container to form an opening and an opening extension 2; wherein during pressing, the wall thickness of the container body is 1 10 mm, the wall thickness of the buffer parts is 5 13 mm, and gradually from one end near the

container body 1 increases to an end far away from the container body 1, and the wall thickness of the end head parts 6 gradually increases from an end near the container body 1 to an end far away from the container body 1; During processing, the metal plate if the raw material is the

Metal plate, first processed into a metal tube and then into one according to S1

° BE2023/5215

inner container processed; Then 18 internal threads are made on the right part of the

Opening extension 2 edited.

S2, sheathing of the brackets 3 on the opening extension 2, with the brackets 3 in

Press fit with the outer wall of the opening extension 2 and ends of the brackets 3 near the inner container stick to the outer wall of the inner container, then press the

Ends of the brackets 3 near the container body 1, so that the ends of the brackets 3 near the container body 1 merge smoothly into the outer wall of the end head parts 6.

S3, using T800 carbon fiber, impregnating the carbon fiber with

Resin, winding the carbon fiber on the outer wall of the inner container to create a

forming carbon fiber wrapping layer 4 having a thickness of 40 mm or more, and covering the carbon fiber wrapping layer 4 at ends of the brackets 3 near the inner container; and

S4, winding glass fibers onto the carbon fiber winding layer 4 to create a glass fiber

To form a protective layer with a thickness of 2 mm.

In this embodiment, the T700 carbon fiber is also used in S3, the thickness of the carbon fiber winding layer 4 formed from the T700 carbon fiber is more than 55mm, the winding method of the carbon fiber in S3 is the same as the existing one

Spiral winding, ring winding or both and is not described in detail in this embodiment.

In practice, the diameter of the sealing plug 7 becomes smaller than that

Outer diameter of the right end of the opening extension 2 selected. Before installing the brackets 3 in S2, the sealing plug 7 is first installed, as when installing the

Bracket 3 in S2 of the sealing plug 7 supports the opening extension 2 to prevent the opening extension 2 from deforming inwards. Secondly, the brackets 3 can also

Press the opening extension 2 against the sealing plug 7, which ensures the sealing effect of the

Closing plug 7 and the O-shaped ring is further improved.

It is understood that modifications and variations to those described herein

Arrangements and details will be clear to other experts. Therefore, it is intended that the invention be defined only by the scope of the following claims and not by the specific details which can be obtained from the description and explanation of the following

Embodiments presented herein are limited. The previously described preferred embodiments, features and aspects of the invention can be freely combined with one another. Although the invention is described with reference to certain

As embodiments have been described, it will be apparent to one skilled in the art that various changes may be made and equivalents substituted without departing from the scope of the invention.

/ BE2023/5215

REFERENCE SYMBOL LIST

1 Container body 2 Opening extension 3 Bracket 4 Carbon fiber wrapping layer 5 Buffer part 6 End head part 7 Closing plug 71 Ring groove

Claims (10)

/ ° BE2023/5215 CLAIMS 1. Type III 70 MPa hydrogen pressure vessel for gas filling station, characterized in that the pressure vessel comprises an inner container, a carbon fiber wrapping layer and a fiberglass protective layer, the carbon fiber wrapping layer being encased outside the inner container and the fiberglass protective layer outside the carbon fiber wrapping layer is covered, wherein a wall thickness of a central part of the inner container is greater than or equal to 10 mm and a wall thickness of both ends of the inner container is larger than that of the central part of the inner container; at least one end of the inner container is provided with an opening and fixed with an opening extension, the opening extension is aligned with the opening, is tubular and penetrates the carbon fiber wrap layer and a glass confining layer; a closure plug is detachably connected in the opening extension, a sealing ring is arranged between the closure plug and the opening extension, a bracket is pushed onto the opening extension, and the bracket is opposite the closure plug. 2. 70 MPa hydrogen pressure vessel of type III for gas filling stations according to claim 1, characterized in that a side wall of the bracket facing the inner container is trumpet-shaped and an end of the bracket facing the inner container is attached to the outer wall of the inner container. 3. 70 MPa hydrogen pressure vessel of type III for gas filling stations according to claim 1, characterized in that an outer wall of the bracket, facing the end of the inner container, merges smoothly into the outer wall of the inner container. 4. 70 MPa hydrogen pressure vessel of type III for gas filling station according to claim 1, characterized in that an end of the bracket facing the inner container is located between the carbon fiber wrapping layer and the inner container. 5. 70 MPa hydrogen pressure vessel of type III for gas filling station according to claim 1, characterized in that the inner container comprises a container body, a buffer part and an end head part, a wall thickness of the container body being more than or equal to 10 mm, a wall thickness of the end head part is larger than a wall thickness of the container body, and the wall thickness of the buffer part gradually increases from an end near the container body to an end near the end head part. 6. 70 MPa hydrogen pressure vessel of type III for gas filling station according to claim 1, characterized in that a length of the buffer part is greater than or equal to 90 mm. ) BE2023/5215 7. Type III 70 MPa hydrogen pressure vessel for gas filling station according to claim 1, characterized in that the wall thickness of the end head part gradually increases from an end close to the container body to an end far from the container body. 8. 70 MPa hydrogen pressure vessel of type III for gas filling station according to claim 1, characterized in that the thickness of the carbon fiber wrapping layer is greater than or equal to 35 mm. 9. A method for processing the 70 MPa hydrogen pressure vessel of type III for gas filling station according to any one of claims 1 - 8, characterized in that it comprises: S1: pressing a metal tube to form an inner container and pressing at least one end of the inner container to form an opening and an opening extension, wherein a wall thickness of a central part of the inner container during pressing is greater than or equal to 10 mm and a wall thickness of both ends of the inner container is greater than the wall thickness of the central part of the inner container; S2: Wrapping the bracket at the opening extension, with one end of the bracket sticking to the outer wall of the inner container near the inner container; S3: impregnating the carbon fiber with resin, winding the carbon fiber on the outer wall of the inner container to form a carbon fiber wrap layer with a thickness of 35 mm or more, and covering the carbon fiber wrap layer at an end of the bracket near the inner container; and S4: winding glass fibers on the carbon fiber wrapping layer to form a glass fiber protective layer, with a thickness of the glass fiber protective layer being greater than or equal to 1.9 mm. 10. A method for processing the Type III 70 MPa hydrogen pressure vessel for gas filling station according to claim 9, characterized in that after forming the opening extension by pressing in S1, an internal thread is processed at the end of the opening extension far away from the inner container and the number of Internal thread is greater than or equal to 18.