A valve seat for a high-pressure plastic inner-lined hydrogen storage cylinder

Abstract

The present invention discloses a valve seat for a high-pressure plastic inner-liner hydrogen storage cylinder, which relates to the technical field of pressure vessel manufacturing. It includes a valve seat body having an axial through-hole, and the axial through-hole communicates with the cavity of the plastic inner-liner. One end of the valve seat body is a connection end for connecting with the plastic inner-liner, and the other end is an open end. The middle part of the valve seat body extends radially outward to form a dish-shaped structure, and the side wall of the open end is connected to the upper surface of the dish-shaped structure through an arc transition. The lower surface of the dish-shaped structure is in contact with the plastic inner-liner, and the upper surface of the dish-shaped structure and the arc surface are wound with a fiber layer. The diameter of the dish-shaped structure is 1 / 2 to 2 / 3 of the diameter of the plastic inner-liner. Compared with the traditional valve seat, in the present invention, the valve seat body extends the diameter of its dish-shaped structure, so that the side surface of the open end is connected to the upper surface of the dish-shaped structure through a 1 / 4 arc transition, which can reduce the surface pressure of the valve seat body on the surface of the carbon fiber reinforced resin layer and improve the sand-sliding phenomenon that occurs in the external carbon fiber winding.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel manufacturing, in particular to a valve seat for a high-pressure plastic liner hydrogen storage cylinder. Background Art

[0002] Currently, hydrogen-powered vehicles and fuel cell vehicles mostly store fuel as compressed gas in cylinders. In my country, the most widely used cylinders are primarily those with alloy liner cylinders. Internationally, plastic-lined fiber-wrapped composite cylinders are rapidly gaining popularity due to their advantages, including light weight, low manufacturing costs, and superior impact and fatigue resistance. These cylinders have a two-layer structure: an outer fiber layer (composite wrapping layer) and an inner plastic liner.

[0003] Plastic liner composite gas cylinders with fully wrapped carbon fibers typically use metal valve seats due to their relatively low strength and rigidity. After prolonged use, metal valve seats can delaminate and leak due to the different materials of the plastic liner and metal valve seat. Furthermore, the valve seats of traditional plastic liner composite gas cylinders are typically elliptical, making it very easy for the carbon fibers on the outside to accumulate and cause sand sliding during the wrapping process. Summary of the invention

[0004] The purpose of the present invention is to provide a high-pressure plastic liner hydrogen storage cylinder valve seat to solve the problems existing in the prior art, reduce the surface pressure of the valve seat body on the carbon fiber reinforced resin layer, and improve the sand sliding phenomenon caused by external carbon fiber winding.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention provides a high-pressure plastic liner hydrogen storage cylinder valve seat, comprising a valve seat body having an axial through hole, wherein the axial through hole is connected to the cavity of the plastic liner; one end of the valve seat body is a connecting end for connecting to the plastic liner, and the other end is an open end; the middle part of the valve seat body extends radially outward to form a dish-shaped structure, and the side wall of the open end is connected to the upper surface of the dish-shaped structure by an arc transition; the lower surface of the dish-shaped structure is in contact with the plastic liner, and the upper surface and the arc surface of the dish-shaped structure are wrapped with a fiber layer; the diameter of the dish-shaped structure is 1 / 2 to 2 / 3 of the diameter of the plastic liner.

[0006] Preferably, the connecting end is coaxially embedded in the annular inner flange of the plastic liner, a metal ring is coaxially arranged inside the end of the annular inner flange, and a sealing ring is arranged between the end side wall of the valve seat body and the end side wall of the annular inner flange.

[0007] Preferably, along the axial direction of the through hole, the length of the metal ring is not less than that of the sealing ring.

[0008] Preferably, an annular mounting groove for accommodating the sealing ring is provided at the end of the valve seat body.

[0009] Preferably, along the axial direction of the through hole, a sealing ring is provided at one end of the annular mounting groove, and the sealing ring is used to fix the sealing ring in the annular mounting groove.

[0010] Preferably, the sealing ring is connected to the end of the valve seat body by cementing.

[0011] Preferably, an internal thread for connecting the valve body is provided on the inner wall of the open end.

[0012] Preferably, the end face of the connecting end is flush with the end face of the annular inward flange.

[0013] The present invention has achieved the following technical effects compared with the prior art:

[0014] 1. Compared with the traditional valve seat, the diameter of the dish-shaped structure of the valve seat body in the present invention is extended, so that the side surface of the open end is connected to the upper surface of the dish-shaped structure through a 1 / 4 arc transition, which can reduce the surface pressure of the valve seat body on the carbon fiber reinforced resin layer and improve the sand-sliding phenomenon of the external carbon fiber winding.

[0015] 2. A metal ring is coaxially arranged inside the end of the annular inward flange in the present invention. The metal ring can prevent the annular inward flange of the plastic inner liner from deforming circumferentially when the valve seat body and the plastic inner liner are assembled, enhance the installation strength and stability, and at the same time is conducive to reducing the impact of the airflow on the mouth of the composite gas cylinder during inflation and deflation, thereby slowing down the deformation of the mouth of the composite gas cylinder and being conducive to reducing the occurrence of air leakage.

[0016] 3. In order to ensure the sealing performance between the valve seat body and the annular inward flange, an annular mounting groove is provided on the side wall of the end of the valve seat body in the present invention. A sealing ring is arranged in the annular mounting groove, and a sealing ring is arranged at the bottom end of the annular mounting groove for axially limiting the sealing ring and can adapt to sealing rings with different axial lengths. At the same time, when a metal ring is arranged in the annular inward flange and is not easily deformed, it can play a role in pressing the sealing ring more effectively. And the greater the pressure inside the hydrogen cylinder, the tighter the sealing ring is pressed by the annular inward flange, which can effectively reduce the occurrence of gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 This is a schematic cross-sectional structure diagram of the valve seat of a high-pressure plastic inner liner hydrogen storage cylinder in the present invention;

[0019] Among them, 1 is the valve seat body; 2 is the axial through-hole; 3 is the dish-shaped structure; 4 is the plastic inner liner; 5 is the fiber layer; 6 is the annular inward flange; 7 is the sealing ring; 8 is the metal ring; 9 is the plugging ring. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] The purpose of the present invention is to provide a valve seat for a high-pressure plastic inner liner hydrogen storage cylinder to solve the problems existing in the prior art, which can reduce the surface pressure of the valve seat body on the surface of the carbon fiber reinforced resin layer and improve the sand slipping phenomenon in the external carbon fiber winding.

[0022] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] As Figure 1 shown, this embodiment provides a valve seat for a high-pressure plastic inner liner 4 hydrogen storage cylinder, including a valve seat body 1 having an axial through-hole 2, and the axial through-hole 2 communicates with the cavity of the plastic inner liner 4; one end of the valve seat body 1 is a connection end for connecting with the plastic inner liner 4, and the other end is an open end, which can connect other components; the middle part of the valve seat body 1 extends radially outward to form a dish-shaped structure 3, and the side wall of the open end and the upper surface of the dish-shaped structure 3 are connected by a 1 / 4 arc transition; the lower surface of the dish-shaped structure 3 and the annular side wall of the dish-shaped structure 3 are both in contact with the plastic inner liner 4, the upper surface of the dish-shaped structure 3 and the 1 / 4 arc surface are wound with a fiber layer 5, and the diameter of the dish-shaped structure 3 is 1 / 2 to 2 / 3 of the diameter of the plastic inner liner 4.

[0024] Compared with the traditional valve seat, in this embodiment, the valve seat body 1 extends the diameter of its dish-shaped structure 3, so that the side surface of the open end and the upper surface of the dish-shaped structure 3 are connected by a 1 / 4 arc transition, which can reduce the surface pressure of the valve seat body 1 on the carbon fiber reinforced resin layer and improve the sand slipping phenomenon in the external carbon fiber winding.

[0025] In this embodiment, the connecting end is coaxially embedded in the annular inward flange 6 of the plastic inner liner 4. A metal ring 8 is coaxially arranged inside the end of the annular inward flange 6. The metal ring 8 can prevent the circumferential deformation of the annular inward flange 6 of the plastic inner liner 4 when the valve seat body 1 and the plastic inner liner 4 are assembled, enhance the installation strength and stability, and at the same time is beneficial to reducing the impact of the airflow on the mouth of the composite gas cylinder during charging and discharging, thereby slowing down the deformation of the mouth of the composite gas cylinder and being conducive to reducing the occurrence of air leakage.

[0026] In order to ensure the sealing performance between the valve seat body 1 and the annular inward flange 6, in this embodiment, an annular installation groove is formed on the end side wall of the valve seat body 1, and a sealing ring 7 is arranged in the annular installation groove. And a plugging ring 9 is arranged at the bottom end of the annular installation groove for axially limiting the sealing ring 7 and can adapt to sealing rings 7 with different axial lengths. At the same time, when the metal ring 8 is arranged in the annular inward flange 6 and is not prone to deformation, it can better press the sealing ring 7. And the greater the pressure inside the hydrogen cylinder, the tighter the sealing ring 7 is pressed by the annular inward flange 6, which can effectively reduce the occurrence of gas leakage.

[0027] Furthermore, in this embodiment, the plugging ring 9 is connected to the end of the valve seat body 1 by means of cementing.

[0028] Furthermore, in this embodiment, internal threads are provided on the inner wall of the open end, which can be used to connect a pressure reducing valve to ensure the stable output of internal gas.

[0029] Furthermore, in this embodiment, the end face of the connecting end is flush with the end face of the annular inward flange 6.

[0030] Adaptations made according to actual needs are all within the protection scope of the present invention.

[0031] It should be noted that for those skilled in the art, obviously the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A valve seat for a high-pressure plastic inner-liner hydrogen storage cylinder, characterized in that, It includes a valve seat body with an axial through-hole, and the axial through-hole communicates with the cavity of the plastic inner liner; one end of the valve seat body is a connection end for connecting with the plastic inner liner, and the other end is an open end; the middle part of the valve seat body extends radially outwards to form a dish-shaped structure, and the side wall of the open end is connected to the upper surface of the dish-shaped structure through an arc transition connection; the lower surface of the dish-shaped structure is attached to the plastic inner liner, and the upper surface of the dish-shaped structure and the arc surface are wound with a fiber layer; the diameter of the dish-shaped structure is 1 / 2 to 2 / 3 of the diameter of the plastic inner liner; The connection end is coaxially embedded in the annular inner flanging of the plastic inner liner, a metal ring is coaxially arranged inside the end of the annular inner flanging, and a sealing ring is arranged between the end side wall of the valve seat body and the end side wall of the annular inner flanging.

2. The valve seat of the high-pressure plastic inner-lined hydrogen storage cylinder according to claim 1, characterized in that, Along the axial direction of the through-hole, the length of the metal ring is not less than that of the sealing ring.

3. The valve seat of the high-pressure plastic inner liner hydrogen storage cylinder according to claim 1, characterized in that, The end of the valve seat body is provided with an annular installation groove for accommodating the sealing ring.

4. The valve seat of the high-pressure plastic inner liner hydrogen storage cylinder according to claim 3, characterized in that, Along the axial direction of the through-hole, one end of the annular installation groove is provided with a plugging ring, and the plugging ring is used to fix the sealing ring in the annular installation groove.

5. The valve seat of the high-pressure plastic inner liner hydrogen storage cylinder according to claim 4, characterized in that, The plugging ring is connected to the end of the valve seat body by means of cementing.

6. The valve seat of the high-pressure plastic inner-liner hydrogen storage cylinder according to any one of claims 1 to 5, characterized in that, Internal threads for connecting the valve body are provided on the inner wall of the open end.

7. The valve seat of the high-pressure plastic inner-liner hydrogen storage cylinder according to claim 6, characterized in that, The end face of the connection end is flush with the end face of the annular inner flanging.

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