Impact-resistant IV-type hydrogen storage bottle structure

Abstract

The utility model discloses an impact-resistant IV type hydrogen storage bottle structure, which comprises a valve seat, a plastic inner container, a connecting cover and a winding layer, the valve seat is provided with a valve seat neck and a valve seat flange, the upper end of the plastic inner container is provided with a connecting part, the connecting cover comprises a connecting cover neck and a gland, the connecting cover neck is in threaded connection with the valve seat neck, and the gland is in threaded connection with the connecting cover neck. The connecting part is arranged between the valve seat neck part and the valve seat flange, the connecting cover neck part and the lower surface of the gland are respectively provided with at least one annular groove, the connecting part is provided with an annular bulge matched with the annular groove, the cross section of the annular groove is semicircular, and the connecting cover neck part is provided with an annular bulge matched with the annular groove. And the winding layer is wound on the outer wall surfaces of the plastic liner and the connecting cover. The utility model aims to solve the technical problems in the prior art, and provides the IV-type hydrogen storage bottle structure which is high in impact resistance, tight in plastic and metal combination and low in gas leakage rate.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen storage bottles, in particular to an impact-resistant IV type hydrogen storage bottle structure. Background Art

[0002] As a low-carbon, green and clean energy, hydrogen energy has become a highly watched field. High-pressure hydrogen storage bottles have developed from all-metal gas cylinders to non-metallic liner fiber-wrapped gas cylinders (Type IV), with a pressure of more than 70MPa. During service, hydrogen storage bottles experience different working conditions such as filling, pressure maintenance and pressure relief. The gas pressure in the bottle changes rapidly. At the same time, during transportation, it will be affected by external factors such as road conditions, and the hydrogen storage bottle is in an impact state. As one of the key structures of the hydrogen storage bottle, the bottle mouth is connected to the hydrogen storage bottle valve on the outside and combined with the plastic liner on the inside. If the design is improper, it may cause the bottle mouth structure to break, the plastic liner to peel off from the metal bottle mouth, and other failures, and finally cause high-pressure hydrogen to leak to the outside, causing serious consequences. Due to the insufficient strength of plastic materials, the design of the Type IV hydrogen storage bottle adopts a combination of plastic liner and metal bottle mouth to improve the strength at the bottle mouth, but this structure also exposes the shortcomings of insufficient bonding strength between plastic and metal and poor sealing. Therefore, the structural type of plastic liner and metal bottle mouth is the key to the design of Type IV hydrogen storage bottles.

[0003] At present, the mouth structure of hydrogen storage bottles is diverse, such as sandwich structure, conical sealing, interference fit and inverted plastic liner structure, etc. However, there are still problems such as poor impact resistance, insufficient stability, need to strengthen the sealing effect, and insufficient bonding strength between different materials. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] The utility model aims to solve the technical problems existing in the prior art and to provide a type IV hydrogen storage bottle structure with strong impact resistance, close combination of plastic and metal, and low gas leakage rate.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the technical solution provided by the utility model is:

[0008] A shock-resistant IV type hydrogen storage bottle structure, comprising a valve seat, a plastic liner, a connecting cover and a winding layer, the valve seat having a valve seat neck and a valve seat flange, a connecting portion being provided at the upper end of the plastic liner, the connecting cover comprising a connecting cover neck and a pressure cover, the connecting cover neck being threadedly connected to the valve seat neck, the connecting portion being provided between the valve seat neck and the valve seat flange, at least one annular groove being provided on the lower surfaces of the connecting cover neck and the pressure cover, an annular protrusion being provided on the connecting portion and cooperating with the annular groove, the cross section of the annular groove being semicircular, and the winding layer being wound around the outer wall surfaces of the plastic liner and the connecting cover.

[0009] Optionally, the connecting portion connects the valve seat and the connecting cover by injection molding.

[0010] Optionally, a first sealing groove is provided on a side of the neck of the connection cover in contact with the winding layer, and a sealing structure is provided in the first sealing groove.

[0011] Optionally, a second sealing groove is provided on a side of the neck of the connection cover that contacts the neck of the valve seat, and a sealing structure is provided in the second sealing groove.

[0012] Optionally, the sealing structure comprises a rubber O-ring and a retaining ring, wherein the rubber O-ring is arranged below the retaining ring and abuts against the retaining ring.

[0013] Optionally, the first sealing groove and / or the second sealing groove are provided with two or more.

[0014] Optionally, the valve seat is made of metal, the connecting cover is made of stainless steel, the inner layer of the winding layer is carbon fiber, and the outer layer is a glass fiber protective layer.

[0015] Optionally, two or more annular grooves are provided on the valve seat neck and / or the gland.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0018] The impact-resistant IV type hydrogen storage bottle structure mainly adopts semicircular grooves and flange structures to achieve impact resistance and fatigue damage resistance. The valve seat and the connecting cover are assembled through threaded connection and placed in the injection mold cavity. The molten plastic is injected into the grooves of the valve seat and the connecting cover. After cooling, the plastic liner is integrated with the valve seat and the connecting cover. The plastic liner is tightly combined with the metal bottle mouth and has strong impact resistance. The semicircular groove extends the leakage channel, so that the gas has a throttling effect and the sealing effect is enhanced. At the same time, the arc-shaped structure plays a role in dispersing stress. The carbon fiber inner layer of the winding layer is wound around the outer wall of the plastic liner and the connecting cover, and then the glass fiber outer layer is wound. The bottle valve is installed at the inner hole of the valve seat through a threaded connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of an impact-resistant IV-type hydrogen storage bottle structure proposed in an embodiment of the utility model;

[0020] Figure 2 A partial schematic diagram of a connection portion in an impact-resistant IV-type hydrogen storage bottle structure proposed in an embodiment of the utility model;

[0021] Figure 3 A partial schematic diagram of a sealing structure in an impact-resistant IV-type hydrogen storage bottle structure proposed in an embodiment of the utility model;

[0022] 1. Valve seat; 11. Valve seat neck; 12. Valve seat flange; 2. Plastic liner; 21. Connecting part; 211. Annular protrusion; 3. Connecting cover; 31. Connecting cover neck; 31a. First sealing groove; 31b. Second sealing groove; 311. Sealing structure; 3111. Rubber O-ring; 3112. Retaining ring; 32. Pressure cover; 4. Wrapping layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.

[0024] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Further, when an element is considered to be "fixedly connected to" another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-on, one-piece fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0027] Combined with Figure 1-3, an impact-resistant IV type hydrogen storage bottle structure of the present embodiment includes a valve seat 1, a plastic liner 2, a connecting cover 3 and a winding layer 4, the valve seat 1 is made of metal, the connecting cover 3 is made of stainless steel, the inner layer of the winding layer 4 is carbon fiber, and the outer layer is a glass fiber protective layer, the valve seat 1 has a valve seat neck 11 and a valve seat flange 12, the valve seat flange 12 is arranged below the valve seat neck 11, a cavity is arranged in the center of the valve seat 1, the direction close to the central axis of the valve seat 1 is defined as the inside, and the direction away from the central axis is the outside; the inner annular surface of the valve seat 1 is provided with an internal thread; the valve seat 1 is connected to the hydrogen storage bottle valve through the internal thread; the outer annular surface of the valve seat neck 11 is provided with an external thread; the upper end of the plastic liner 2 is provided with a connecting portion 21, and the connecting portion 21 is annularly designed The connecting cover 3 comprises a connecting cover neck 31 and a pressure cover 32. The pressure cover 32 is arranged below the connecting cover neck 31. The lower end surface of the pressure cover 32 is flush with the lower end surface of the valve seat neck 11. The connecting cover neck 31 is threadedly connected to the valve seat neck 11. The connecting part 21 is arranged between the valve seat neck 11 and the valve seat flange 12. The upper end surface of the connecting part 21 abuts against the connecting cover neck 31 and the pressure cover 32. The lower end surface of the connecting part 21 abuts against the valve seat flange 12. The lower surfaces of the connecting cover neck 31 and the pressure cover 32 are each provided with at least one annular groove. The connecting part 21 is provided with an annular protrusion 211 that cooperates with the annular groove. The cross section of the annular groove is semicircular. The winding layer 4 is wound around the outer wall of the plastic liner 2 and the connecting cover 3.

[0028] The impact-resistant IV type hydrogen storage bottle structure mainly adopts semicircular grooves and flange structures to achieve impact resistance and fatigue damage resistance. The valve seat 1 and the connecting cover 3 are assembled by threaded connection and placed in the injection mold cavity. The molten plastic is injected into the grooves of the valve seat 1 and the connecting cover 3. After cooling, the plastic liner 2 is integrated with the valve seat 1 and the connecting cover 3. The plastic liner 2 is tightly combined with the metal bottle mouth and has strong impact resistance. The semicircular groove extends the leakage channel, so that the gas has a throttling effect and the sealing effect is enhanced. At the same time, the arc-shaped structure plays a role in dispersing stress. The carbon fiber inner layer of the winding layer 4 is wound around the outer wall of the plastic liner 2 and the connecting cover 3, and then the glass fiber outer layer is wound. The bottle valve is installed at the inner hole of the valve seat 1 through a threaded connection.

[0029] The valve seat flange 12 is arranged below the plastic liner connection part 21, and the valve seat neck 11, the valve seat flange 12 and the connection part 21 form a "sandwich" structure, which effectively prevents the plastic liner from slipping in the axial direction. At the same time, when the hydrogen storage bottle is working, the gas pressure in the bottle acts on the lower surface of the valve seat flange 12, so that the bonding strength between the valve seat 1 and the plastic liner 2 is improved, so that the bottle mouth structure has good adaptability.

[0030] Figure 2① and ②③ form a limiting structure, and the plastic liner 2 is firmly embedded in the groove. When the plastic liner 2 is impacted by the external or internal gas pressure of the gas cylinder, the valve seat 1 and the connecting cover 3 will prevent the plastic liner 2 from sliding. When the gas pressure acts on the wall of the valve seat, the contact pressure between the plastic liner 2 and the valve seat 1 and the connecting cover 3 increases, and the sealing performance is enhanced accordingly. At the same time, the ①②③ structures change the gas flow direction, effectively reducing gas leakage.

[0031] The annular grooves on the valve seat 1 and the connecting cover 3 both adopt an arc structure to effectively disperse the forces acting at ②③, and the stress distribution of the plastic liner and the metal bottle mouth is more uniform, which can avoid stress concentration and failure of the bottle mouth structure, and improve the bonding strength between the plastic liner 2 and the valve seat 1 and the connecting cover 3.

[0032] As a preferred solution of the utility model, a first sealing groove 31a is provided on the side of the connection cover neck 31 that contacts the winding layer 4, and a sealing structure 311 is provided in the first sealing groove 31a. A second sealing groove 31b is provided on the side of the connection cover neck 31 that contacts the valve seat neck 11. The second sealing groove 31b is arranged below the threaded connection between the connection cover neck 31 and the valve seat neck 11, and a sealing structure 311 is provided in the second sealing groove 31b. The sealing structures 311 in the first sealing groove 31a and the second sealing groove 31b are of the same structure, both including a rubber O-ring 3111 and a retaining ring 3112. The rubber O-ring 3111 is arranged below the retaining ring 3112 and abuts against the retaining ring 3112 to prevent the rubber O-ring 3111 from shearing failure at the gap. The rubber O-ring 3111 is deformed under pressure to block the gas leakage channel, and the contact tightness between the rubber O-ring 3111 and the sealing surface is proportional to the gas pressure in the bottle. The rubber-plastic seal has low cost and significant sealing effect.

[0033] As a preferred solution of the present utility model, two or more first sealing grooves 31 a and second sealing grooves 31 b are provided, and are spaced apart along the axial direction of the connecting cover 3 .

[0034] As a preferred solution of the utility model, two or more annular grooves are provided on the valve seat neck 11 and the pressure cover 32 , and are arranged at intervals along the radial direction of the valve seat 1 and the connecting cover 3 .

[0035] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An impact-resistant IV-type hydrogen storage bottle structure, characterized in that: It includes a valve seat, a plastic liner, a connecting cover and a winding layer, the valve seat has a valve seat neck and a valve seat flange, the upper end of the plastic liner is provided with a connecting portion, the connecting cover includes a connecting cover neck and a pressure cover, the connecting cover neck is threadedly connected to the valve seat neck, the connecting portion is arranged between the valve seat neck and the valve seat flange, the lower surfaces of the connecting cover neck and the pressure cover are each provided with at least one annular groove, the connecting portion is provided with an annular protrusion that cooperates with the annular groove, the cross-section of the annular groove is semicircular, and the winding layer is wound around the outer wall surfaces of the plastic liner and the connecting cover.

2. The impact-resistant IV type hydrogen storage bottle structure according to claim 1, characterized in that: The connecting portion is connected to the valve seat and the connecting cover by injection molding.

3. The impact-resistant IV type hydrogen storage bottle structure according to claim 1, characterized in that: A first sealing groove is provided on the side of the neck of the connection cover in contact with the winding layer, and a sealing structure is provided in the first sealing groove.

4. The impact-resistant IV type hydrogen storage bottle structure according to claim 3, characterized in that: A second sealing groove is provided on the side of the neck of the connection cover that contacts the neck of the valve seat, and a sealing structure is provided in the second sealing groove.

5. The impact-resistant IV type hydrogen storage bottle structure according to claim 4, characterized in that: The sealing structure comprises a rubber O-ring and a retaining ring, wherein the rubber O-ring is arranged below the retaining ring and abuts against the retaining ring.

6. The impact-resistant IV type hydrogen storage bottle structure according to claim 4, characterized in that: The first sealing groove and / or the second sealing groove are provided with two or more.

7. An impact-resistant IV type hydrogen storage bottle structure according to any one of claims 1 to 6, characterized in that: The valve seat is made of metal, the connection cover is made of stainless steel, the inner layer of the winding layer is carbon fiber, and the outer layer is a glass fiber protective layer.

8. An impact-resistant IV type hydrogen storage bottle structure according to any one of claims 1 to 6, characterized in that: The annular groove is provided with two or more on the valve seat neck and / or the gland.

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