Sealing head structure of novel high-pressure gas cylinder plastic inner container and gas cylinder inner container

Abstract

The utility model relates to a novel end socket structure of a high-pressure gas cylinder plastic inner container and a gas cylinder inner container, the inner container comprises an end socket structure and an inner container main body, and the end socket structure is connected to the inner container main body in a sealing mode; the sealing head structure comprises a sealing head and a valve seat; the sealing head is made of a material which can deform under stress and comprises a neck part, a first cambered surface ring and a second cambered surface ring; the outer side edge of the second cambered surface ring is connected with the liner main body, and the inner side edge is hermetically connected to the outer side edge of the first cambered surface ring; the inner side edge of the first cambered surface ring is hermetically connected to the bottom edge of the neck part; the neck part is made of a material which can deform under stress; the valve seat is made of rigid materials, the bottom of the valve seat is arranged on the neck in a sleeving mode, the bottom face of the valve seat is attached to the first cambered surface ring, and the valve seat and the neck are in sealed connection through a first sealing ring. According to the utility model, self-sealing can be realized, and the sealing performance under high pressure is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen storage, in particular to a head structure of a new type of high-pressure gas cylinder plastic inner liner and a gas cylinder inner liner. Background Art

[0002] High-pressure gas cylinders are widely used in vehicle-mounted gas storage systems, such as CHG / CNG gas cylinders. From the perspective of product types, the Chinese high-pressure gas cylinder market mainly includes Type I, Type II, Type III and Type IV. Type I cylinders are composed of metal steel, while Type II cylinders are mainly made of metal materials, but the outer layer has been wound with fiberglass composite materials; Type III and Type IV cylinders are mainly based on carbon fiber reinforced plastic materials. The former has a metal inner liner, and the latter has a plastic inner liner, and the outside is processed by winding carbon fiber reinforced plastics. At present, Type II gas cylinders occupy the dominant position in the market due to their good performance and wide application, but Type IV cylinders show obvious advantages in terms of large size, light weight, high gas storage density and long life. In the research and development of Type IV cylinders, the structural design of the plastic inner liner head is a research hotspot. A typical head design on the market (CN 116293434 A) is as Figure 2 shown: including end cap A, BOSS structure B and plastic inner liner C. Among them, end cap A is inserted into BOSS structure B and fixedly connected to BOSS structure B. BOSS structure B is sleeved on the outside of the upper part of plastic inner liner C and fixedly connected to plastic inner liner C through rotational molding. Sealing elements F are provided at the contact surfaces between end cap A and BOSS structure B and between end cap A and plastic inner liner C to achieve the sealing of the gas in the gas bladder. However, this sealing method is prone to sealing failure under high-pressure working conditions. The above problems need to be solved urgently. Summary of the Utility Model

[0003] The utility model discloses a head structure of a new type of high-pressure gas cylinder plastic inner liner and a gas cylinder inner liner, aiming to solve the technical problems existing in the prior art.

[0004] The utility model adopts the following technical solutions:

[0005] On the one hand, the utility model provides a head structure of a new type of high-pressure gas cylinder plastic inner liner. The inner liner includes a head structure and an inner liner main body, and the head structure is hermetically connected to the inner liner main body; the head structure includes a head and a valve seat; the head is made of a material that can deform under force and includes a neck, a first arc surface ring and a second arc surface ring; the outer edge of the second arc surface ring is used to be connected to the inner liner main body, and the inner edge is hermetically connected to the outer edge of the first arc surface ring; the inner edge of the first arc surface ring is hermetically connected to the bottom edge of the neck; the valve seat is made of a rigid material and is sleeved on the neck at the bottom, and the bottom surface fits with the first arc surface ring. The valve seat and the neck are hermetically connected through a first sealing ring.

[0006] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the outer edge of the valve seat coincides with the inner edge of the second arc surface ring, and the tangents of the edges of the top surface of the valve seat and the inner edge of the second arc surface ring both extend along the direction perpendicular to the axis of the inner liner.

[0007] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the tangent of the outer edge of the first arc surface ring extends along the direction perpendicular to the axis of the inner liner.

[0008] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the arc radius of the outer arc surface of the first arc surface ring is greater than or equal to 10 mm.

[0009] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the head is made of plastic material; an arc transition is provided between the neck and the first arc surface ring, and the arc radius is greater than or equal to 10 mm.

[0010] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, a first groove for accommodating the first sealing ring is provided inside the valve seat.

[0011] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the valve seat and the neck are also hermetically connected through a second sealing ring; the second sealing ring is arranged closer to the top of the neck.

[0012] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the head structure further includes a valve; the valve is installed on the valve seat and is hermetically connected to the valve seat.

[0013] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the valve and the valve seat are hermetically connected through a third sealing ring.

[0014] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, there are two third sealing rings, and the two third sealing rings are arranged at intervals.

[0015] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the valve is provided with a second groove for accommodating the third sealing ring.

[0016] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the top surface of the valve seat abuts and seals against the annular protrusion on the valve.

[0017] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, there is an overlapping part between the top of the valve and the top surface of the valve seat, and the annular protrusion is arranged on the overlapping part.

[0018] In the head structure of the novel plastic inner liner of the high-pressure gas cylinder of the present utility model, the valve seat is threadedly connected to the neck.

[0019] In a second aspect, the present utility model further provides a gas cylinder inner liner, which includes the head structure described in any one of the above and an inner liner main body; one side of the inner liner main body is an open structure; the edge of the head structure is sealingly connected to the edge of the open structure.

[0020] The technical solution adopted by the present utility model can achieve the following beneficial effects:

[0021] The present utility model mainly provides a head structure of a novel plastic inner liner of a high-pressure gas cylinder. Based on the valve seat being made of a rigid material, the valve seat and the neck are sealingly connected through a first sealing ring, and the head is made of a material that can deform under force; based on the first sealing ring being arranged between the valve seat and the neck to seal the gap between the valve seat and the neck. When high-pressure gas is filled, the head has a tendency to expand outward under the internal and external pressure difference, that is, it can deform. That is, the neck is pulled radially outward by the circumferential pulling force of the first arc surface, and has a radial outward deformation. And since the valve seat is made of a rigid material and cannot deform, due to the deformation of the neck, the first sealing ring will be further clamped, thereby improving the sealing performance between the valve seat and the neck, realizing self-sealing, and effectively improving the sealing performance under high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. These drawings form a part of the present utility model. The schematic embodiments of the present utility model and their descriptions explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of a head structure of a novel plastic inner liner of a high-pressure gas cylinder of the present utility model;

[0024] Figure 2 It is a schematic diagram of the head structure in the prior art;

[0025] Figure 3 It is a schematic structural diagram of the gas cylinder inner liner of the present utility model.

[0026] Description of the reference numerals:

[0027] 1. Head structure; 11. Head; 111. Neck; 112. First arc surface ring; 113. Second arc surface ring; 12. Valve seat; 121. First groove; 13. First sealing ring; 14. Second sealing ring; 15. Valve; 151. Second groove; 152. Annular protrusion; 16. Third sealing ring; 17. First retaining ring; 18. Second retaining ring; 2. Inner liner main body. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments of the present utility model and the corresponding drawings. In the description of the present utility model, it should be noted that the term "or" is generally used in the sense of including "and / or", unless otherwise clearly specified in the content.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection" and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or a magnetic connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0030] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0031] To solve the problems existing in the prior art, the embodiments of the present application provide a head structure of a novel high-pressure gas cylinder plastic inner liner and a gas cylinder inner liner.

[0032] Embodiment 1

[0033] This embodiment provides a head structure of a novel high-pressure gas cylinder plastic inner liner. The inner liner includes a head structure 1 and an inner liner main body 2, and the head structure 1 is sealingly connected to the inner liner main body 2; as Figure 1As shown in the figure, the head structure 1 includes a head 11 and a valve seat 12; the head 11 is made of a material that can deform under force, such as plastic, and includes a neck 111, a first arc surface ring 112, and a second arc surface ring 113; the outer edge of the second arc surface ring 113 is used to connect with the inner container body 2, and the inner edge is hermetically connected to the outer edge of the first arc surface ring 112; the inner edge of the first arc surface ring 112 is hermetically connected to the bottom edge of the neck 111; the valve seat 12 is made of a rigid material, such as metal, and the bottom is sleeved on the outside of the neck 111, and the bottom surface is attached to the first arc surface ring 112. The valve seat 12 and the neck 111 are hermetically connected through a first sealing ring 13, specifically, elastically abutted and sealed.

[0034] For the head structure of a new type of high-pressure gas cylinder plastic inner container of the present utility model, based on the valve seat 12 being made of a rigid material, the valve seat 12 and the neck 111 are hermetically connected through a first sealing ring 13, and the head 11 is made of a material that can deform under force; based on the first sealing ring 13 being arranged between the valve seat 12 and the neck 111 to seal the gap between the valve seat 12 and the neck 111. When high-pressure gas is filled, the head 11 has a tendency to expand outward under the internal and external pressure difference, that is, it can deform. That is, the neck 111 has a radial outward deformation under the outward pulling force of the first arc surface ring 112. And because the valve seat 12 is made of a rigid material and cannot deform, due to the deformation of the neck 111, the first sealing ring 13 will be further clamped, thereby improving the sealing performance between the valve seat 12 and the neck 111, realizing self-sealing, and effectively improving the sealing performance under high pressure.

[0035] In some preferred embodiments, the outer edge of the valve seat 12 coincides with the inner edge of the second arc surface ring 113, and the tangents of the edges of the top surface of the valve seat 12 and the inner edge of the second arc surface ring 113 both extend along the direction perpendicular to the axis of the inner container. Based on the head 11 being set to include a neck 111, a first arc surface ring 112, and a second arc surface ring 113, and the valve seat 12 being set with its edge coinciding with the inner edge of the second arc surface ring 113 and both being perpendicular to the axis of the inner container, the stress concentration can be reduced, and the risk of cracking at the junction of the valve seat 12 and the second arc surface ring 113 in the low-temperature fatigue test can be reduced.

[0036] In some preferred embodiments, the tangent of the outer edge of the first arc surface ring 112 extends along the direction perpendicular to the axis of the inner container; based on this setting, the stress concentration at the junction of the valve seat 12 and the second arc surface ring 113 can be further reduced, and the risk of cracking at the junction of the valve seat 12 and the second arc surface ring 113 in the low-temperature fatigue test can be reduced.

[0037] In some preferred embodiments, the curvature of the outer arc curve of the second arc surface ring 113 is based on the formula where a:b = 0.8 - 0.9; a = R - r; R is the radius of the head 11 in the radial direction (radial direction of the inner liner), and r is the maximum disk surface radius of the valve seat 12, that is, the maximum radius of the valve seat 12 in the radial direction of the inner liner.

[0038] In some preferred embodiments, the arc radius R1 on the outer side of the first arc surface ring 112 is greater than or equal to 10 mm; based on setting the arc radius R1 on the outer side of the first arc surface ring 112 to be greater than or equal to 10 mm, on the one hand, the stress concentration at the junction position between the valve seat 12 and the second arc surface ring 113 is further reduced, and on the other hand, when the head 11 and the valve seat adopt the rotational molding process, the molding effect is improved.

[0039] In some preferred embodiments, the head 11 is made of plastic; there is a circular arc transition between the neck 111 and the first arc surface ring 112, and the circular arc radius R2 is greater than or equal to 10 mm; based on setting a circular arc transition between the neck 111 and the first arc surface ring 112 and the circular arc radius R2 being greater than or equal to 10 mm, the thickness uniformity can be improved when the head 11 and the inner liner body 2 are manufactured by injection molding or blow molding for rotational molding; specifically, the bottom edge of the neck 111 is lower than the outer edge of the first arc surface ring 112 and the inner edge of the second arc surface ring 113.

[0040] In some preferred embodiments, the inner side of the valve seat 12 has a first groove 121 for accommodating the first sealing ring 13; the compression ratio of the first sealing ring 13 during operation is 25%; based on this, the elasticity of the first sealing ring 13 can be ensured during long-term use, and thus the sealing performance can be ensured; preferably, a first retaining ring 17 is further provided in the first groove 121, and the first retaining ring 17 is arranged closer to the top of the valve seat 12 to ensure the self-sealing characteristic of the first sealing ring 13 under high pressure and improve the sealing performance under high-pressure conditions; further preferably, the width of the first groove 121 is equal to 1.5 times the wire diameter of the first sealing ring 13 plus the thickness of the first retaining ring 17 to improve the sealing performance, and other widths of the first groove 121 and wire diameters of the first sealing ring 13 can also be selected, which are specifically determined according to the working conditions.

[0041] In some preferred embodiments, the valve seat 12 and the neck 111 are also sealed and connected through a second sealing ring 14; the second sealing ring 14 is arranged closer to the top of the neck 111; based on setting the second sealing ring 14 on the basis of the first sealing ring 13, the sealing performance is further improved, and by setting the second sealing ring 14 at a position closer to the top of the neck 111 than the first sealing ring 13, the sealing performance between the valve seat 12 and the neck 111 can be improved while ensuring the sealing effect under high-pressure conditions; similarly, a second retaining ring 18 is arranged at the adjacent position of the second sealing ring 14, and its effect and setting method are the same as those of the first retaining ring 17, so details are not repeated.

[0042] In some preferred embodiments, the head structure 1 further includes a valve 15; the valve 15 is installed on the valve seat 12 and is sealingly connected to the valve seat 12.

[0043] In some preferred embodiments, the valve 15 and the valve seat 12 are sealingly connected through a third sealing ring 16; preferably, there are two third sealing rings 16, and the two third sealing rings 16 are arranged at intervals, that is, arranged axially at intervals along the valve seat 12 to improve the sealing performance between the valve 15 and the valve seat 12.

[0044] Preferably, the valve 15 is provided with a second groove 151 for accommodating the third sealing ring 16.

[0045] In some preferred embodiments, the top surface of the valve seat 12 abuts and seals against the annular protrusion 152 on the valve 15; specifically, the valve 15 is screwed to the valve seat 12, and there is an overlapping part between the top of the valve 15 and the top surface of the valve seat 12, and the annular protrusion 152 is arranged on the overlapping part; then during the screwing process of the valve 15 and the valve seat 12, the annular protrusion 152 can abut against the top surface of the valve seat 12 to seal the two, so as to further improve the sealing effect.

[0046] In some preferred embodiments, the valve seat 12 is threadedly connected to the neck 111 to improve the connection strength between the valve seat 12 and the neck 111, and thus adapt to the working condition of a high weight of the inner liner; preferably, the bottom of the valve seat 12 and the top of the neck 111 are threadedly connected, such as the inner surface of the valve seat 12 and the outer surface of the neck 111 are respectively provided with matching threads.

[0047] Embodiment 2

[0048] This embodiment provides a gas cylinder inner liner, as Figure 3 shown, which includes the head structure 1 and the inner liner body 2 in the above-mentioned Embodiment 1; one side of the inner liner body 2 is an open structure; the edge of the head structure 1 is sealingly connected to the edge of the open structure.

[0049] For the head structure 1 of the gas cylinder inner liner of the present utility model, based on setting the head 11 to include a neck 111, a first arc surface ring 112 and a second arc surface ring 113, and setting the valve seat 12 so that its edge coincides with the inner edge of the second arc surface ring 113 and is perpendicular to the axis of the inner liner, it is possible to reduce stress concentration and reduce the risk of cracking at the junction of the valve seat 12 and the second arc surface ring 113 during the low-temperature fatigue test of the head 11 and the valve seat 12; and by using an inner liner body 2 and a head 11 made of a plastic material (such as PE material), the inner liner volume can be made more than 1000L to increase the inner liner capacity.

[0050] The embodiments of the present utility model have been described above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many forms without departing from the purpose of the present utility model and the scope protected by the claims, and all of them fall within the protection scope of the present utility model.

Claims

1. A head structure for a plastic liner of a new type of high-pressure gas cylinder. The liner includes a head structure and a liner body, and the head structure is sealingly connected to the liner body. It is characterized in that, The head structure includes a head and a valve seat; The head is made of a material that can deform under force and includes a neck, a first arc-shaped ring, and a second arc-shaped ring; The outer edge of the second arc-shaped ring is used to connect with the main body of the inner container, and the inner edge is sealingly connected to the outer edge of the first arc-shaped ring; The inner edge of the first arc-shaped ring is sealingly connected to the bottom edge of the neck; The valve seat is made of a rigid material, and its bottom is sleeved outside the neck, and its bottom surface fits against the first arc-shaped ring. The valve seat and the neck are sealingly connected through a first sealing ring.

2. The head structure of the plastic inner liner of the new type of high-pressure gas cylinder according to claim 1, characterized in that, The outer edge of the valve seat coincides with the inner edge of the second arc-shaped ring, and the tangents of the edges of the top surface of the valve seat and the inner edge of the second arc-shaped ring both extend along a direction perpendicular to the axis of the inner container.

3. The head structure of the plastic inner liner of the novel high-pressure gas cylinder according to claim 2, characterized in that, The tangent of the outer edge of the first arc-shaped ring extends along a direction perpendicular to the axis of the inner container.

4. The head structure of the plastic liner of the new type high-pressure gas cylinder according to claim 2, characterized in that, The arc radius of the outer arc surface of the first arc-shaped ring is greater than or equal to 10 mm.

5. The head structure of the plastic inner liner of the new high-pressure gas cylinder according to claim 1, characterized in that, The head is made of plastic material; there is an arc transition between the neck and the first arc-shaped ring, and the arc radius is greater than or equal to 10 mm.

6. The head structure of the plastic inner liner of the new high-pressure gas cylinder according to claim 1, characterized in that, The inner side of the valve seat has a first groove for accommodating the first sealing ring.

7. The head structure of the plastic inner liner of the new type of high-pressure gas cylinder according to claim 6, characterized in that, The valve seat and the neck are also sealingly connected through a second sealing ring; the second sealing ring is arranged closer to the top of the neck.

8. The head structure of the plastic inner liner of the novel high-pressure gas cylinder according to claim 1, characterized in that, The head structure further includes a valve; The valve is installed on the valve seat and is sealingly connected to the valve seat.

9. The head structure of the plastic inner liner of the novel high-pressure gas cylinder according to claim 8, characterized in that, The valve and the valve seat are sealingly connected through a third sealing ring.

10. The head structure of the plastic liner of the novel high-pressure gas cylinder according to claim 8, characterized in that, The top surface of the valve seat abuts and seals against the annular protrusion on the valve.

11. The head structure of the plastic inner liner of the new high-pressure gas cylinder according to claim 1, characterized in that, The valve seat is threadedly connected to the neck.

12. An inner liner of a gas cylinder, characterized in that, It includes the head structure according to any one of claims 1-11 above and the main body of the inner container; One side of the main body of the inner container is an open structure; The edge of the head structure is sealingly connected to the edge of the open structure.

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