Inner container sealing structure of four-type bottle and four-type bottle with same

Abstract

The invention relates to the technical field of pressure containers, and discloses a four-type bottle inner container sealing structure and a four-type bottle with the same. The invention discloses a four-type bottle liner sealing structure which comprises a valve seat, the inner plug is installed in an inner cavity of the valve seat, the inner plug is in sealing fit with the valve seat, an installation space is reserved between the end, facing the inner side of the valve seat, of the inner plug and the valve seat, the installation space comprises an installation gap and a jacking gap, and the jacking gap is obliquely arranged towards the valve seat relative to the installation gap; and the plastic inner container is mounted in the mounting space, and the mounting space is completely filled with the plastic inner container. The inclined valve seat inclined surface structure is adopted, at the moment, the inner plug can abut against the plastic inner container for pre-tightening in the process of being installed in the valve seat in cooperation with the inclined inclined surface in the valve seat, collapse and deformation of the plastic inner container are prevented, the creep resistance effect of the plastic inner container is enhanced through limiting and pre-tightening, and finally the purpose of enhancing the sealing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessels, and in particular to a four-type bottle inner liner sealing structure and a four-type bottle having the same. Background Art

[0002] Plastic liner fiber fully wrapped gas cylinders are Type IV cylinders, whose liner is mostly made of non-metallic materials, such as high-density polyethylene or polyethylene terephthalate polyester plastic, and the outer layer is wrapped with composite materials such as carbon fiber and epoxy resin. Type IV cylinders are the main type of gas cylinders used in hydrogen fuel cell vehicles because of their light weight, good fatigue resistance and high hydrogen storage density.

[0003] During the processing of the Type IV bottle, the hollow liner is usually made by rotational molding. Plastic powder is injected into the rotational molding mold, valve seats are installed at both ends of the mold, and the mold is heated and rolled to achieve the integrated molding of molten plastic and valve seats. The cylinder valve seat is used to connect valves, plugs and other cylinder accessories. Since hydrogen storage cylinders are required to achieve high energy density storage, the internal pressure of the cylinder is relatively high. In addition, the temperature of the cylinder will change dramatically during the filling and deflation process. The strong internal pressure and the rapid temperature change during inflation are a huge test for the plastic liner and the sealing ring. Under extreme temperature environments and ultra-high pressure, the plastic liner is prone to collapse and shrinkage, and other sealing failures. Summary of the invention

[0004] In view of this, the present invention provides a four-type bottle liner sealing structure and a four-type bottle having the same, so as to solve the problem of sealing failure such as collapse and shrinkage of the plastic liner of the four-type bottle liner in the prior art under extreme temperature environment and ultra-high pressure.

[0005] In a first aspect, the present invention provides a four-type bottle liner sealing structure, comprising:

[0006] Valve seat;

[0007] An inner plug is installed in the inner cavity of the valve seat, the inner plug is sealed with the valve seat, an installation space is reserved between the end of the inner plug facing the inner side of the valve seat and the valve seat, the installation space includes an installation gap and a tightening gap, and the tightening gap is inclined toward the valve seat relative to the installation gap;

[0008] A plastic liner is installed in the installation space, and the plastic liner completely fills the installation space.

[0009] In the sealing structure of the type IV bottle liner, the plastic liner is molded on the inner side of the valve seat. When installing the inner plug, the inner plug is installed into the valve seat from the open end of the valve seat. Since the plastic liner completely fills the installation space, the shape of the plastic liner is adapted to the installation space, and the tightening gap is inclined relative to the installation gap, so that the end of the plastic liner is formed into an inclined surface that is adapted to the shape of the tightening gap. When installing the inner plug, the inclined surface of the tightening gap formed on the inner side of the inner plug cooperates with the inclined surface of the end of the plastic liner to form a tightening seal. With the inclined valve seat inclined surface structure, the inner plug cooperates with the inclined inclined surface in the valve seat during the installation process into the valve seat, and can resist the plastic liner for pre-tightening to prevent the shrinkage and deformation of the plastic liner, thereby enhancing the anti-creep effect of the plastic liner through limiting and pre-tightening, and finally achieving the purpose of enhancing the sealing effect.

[0010] In an optional embodiment, a first sealing member is installed between the inner plug and the plastic liner. The inner plug and the plastic liner are sealed by the first sealing member, and the first sealing member, under the pressure of the plastic liner, fits against a side of the plastic liner facing the inner plug to achieve sealing.

[0011] In an optional embodiment, a first sealing groove is provided at a position of the inner plug facing the installation gap, the first sealing member is installed in the first sealing groove, and the first sealing member extends from the first sealing groove into the installation space. The installation position of the first sealing member is limited by providing the first sealing groove, thereby preventing the first sealing member from shifting during the installation of the inner plug, thereby preventing the sealing effect from being weakened.

[0012] In an optional embodiment, a second seal is installed in the tightening gap, and the second seal is compressed and installed between the plastic liner and the inner plug. By arranging the second seal in the inclined tightening gap, when the first seal is deformed under extreme temperature environment and ultra-high pressure, a second sealing surface is formed at the tightening gap between the inner plug and the valve seat, which greatly compensates for the defect of gas cylinder leakage after the plastic liner collapses.

[0013] In an optional embodiment, a second sealing groove is provided at a position of the inner plug facing the tightening gap, the second sealing member is fixedly installed in the second sealing groove, and the second sealing member extends into the tightening gap. The second sealing groove is provided to limit the installation position of the second sealing member, thereby ensuring the stability of the position of the second sealing member and thus ensuring the stability of the sealing effect of the second sealing member.

[0014] In an optional embodiment, a surface of the second sealing member that cooperates with the plastic liner is a curved surface.

[0015] In an optional embodiment, the installation gap is parallel to the axial direction of the inner plug, and the angle between the tightening gap and the installation gap is 120°-150°.

[0016] In an optional embodiment, a retaining ring is installed between the plastic liner and the inner plug in the tightening gap.

[0017] In an optional embodiment, the plastic liner is fixedly matched with the valve seat.

[0018] In a second aspect, the present invention further provides a four-type bottle having the four-type bottle liner sealing structure of the present invention. Because the four-type bottle includes the four-type bottle liner sealing structure, it has the same effect as the four-type bottle liner sealing structure, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the internal structure of a four-type bottle liner sealing structure provided in an embodiment of the present invention.

[0021] Figure 2 A schematic diagram of the appearance structure of the four-type bottle liner sealing structure provided in an embodiment of the present invention.

[0022] Figure 3 for Figure 1 A partial enlarged view of point A in the middle.

[0023] Explanation of the accompanying drawings: 1. valve seat; 2. inner plug; 3. plastic liner; 4. first sealing member; 5. second sealing member; 6. retaining ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0026] According to an embodiment of the present invention, on the one hand, a fourth-type bottle liner sealing structure is provided, comprising a valve seat 1, an inner plug 2 and a plastic liner 3.

[0027] The inner plug 2 is installed in the inner cavity of the valve seat 1. The inner plug 2 is sealed with the valve seat 1. An installation space is reserved between the end of the inner plug 2 facing the inner side of the valve seat 1 and the valve seat 1. The installation space includes an installation gap and a tightening gap. The tightening gap is inclined toward the valve seat 1 relative to the installation gap. The plastic liner 3 is installed in the installation space, and the plastic liner 3 completely fills the installation space. In this embodiment, the inner plug 2 is sealed with the valve seat 1 through a sealing ring and the plastic liner 3.

[0028] When installing the plastic liner, the end of the plastic liner 3 is melted in advance, and then the plastic liner 3 is fixed on the inner wall of the valve seat 1 by a rotational molding process, and then the inner plug 2 is installed. The installation space is annular between the inner plug 2 and the valve seat 1, wherein the installation gap part is cylindrical and the top-tightening gap part is truncated. The installation space is inclined toward the valve seat 1, so that the parts of the valve seat 1 and the inner plug 2 corresponding to the top-tightening gap are both inclined surfaces.

[0029] In the sealing structure of the fourth type bottle liner, the plastic liner 3 is formed on the inner side of the valve seat 1. When installing the inner plug 2, the inner plug 2 is installed into the valve seat 1 from the open end of the valve seat 1. Since the plastic liner 3 completely fills the installation space, the shape of the plastic liner 3 is adapted to the shape of the installation space, and the tightening gap is inclined relative to the installation gap, so that the end of the plastic liner 3 is formed into an inclined surface that is adapted to the shape of the tightening gap. When installing the inner plug 2, the inclined surface of the tightening gap formed on the inner side of the inner plug 2 cooperates with the inclined surface of the end of the plastic liner 3 to tighten and seal. With the inclined surface structure of the inclined valve seat 1, the inner plug 2 cooperates with the inclined surface of the valve seat 1 during the installation process into the valve seat 1, and can resist the plastic liner 3 for pre-tightening, so as to prevent the shrinkage and deformation of the plastic liner 3, thereby strengthening the anti-creep effect of the plastic liner 3 through limiting and pre-tightening, and finally achieving the purpose of enhancing the sealing effect.

[0030] In one embodiment, in order to ensure the sealing effect between the inner plug 2 and the plastic liner 3, a first sealing member 4 is installed between the inner plug 2 and the plastic liner 3. The inner plug 2 and the plastic liner 3 are sealed by the first sealing member 4, and the first sealing member 4 will fit the side of the plastic liner 3 facing the inner plug 2 under the pressure of the plastic liner 3 to achieve sealing.

[0031] In order to prevent the first seal 4 from moving significantly during the installation of the inner plug 2, causing the sealing effect to deteriorate or fail, a first sealing groove is provided at the position of the inner plug 2 facing the installation gap, and the first seal 4 is installed in the first sealing groove, and the first seal 4 extends from the first sealing groove to the installation space. The installation position of the first seal 4 is limited by providing the first sealing groove, thereby preventing the first seal 4 from shifting during the installation of the inner plug 2, causing the sealing effect to weaken.

[0032] Specifically, the first sealing member 4 is a soft sealing ring made of rubber, silicone, etc. The soft sealing ring will fit the plastic surface under the pressure of the plastic liner 3 to achieve sealing.

[0033] Furthermore, in order to ensure the sealing effect of the sealing structure of the fourth-type bottle liner when the first seal is deformed and fails under extreme temperature environment and ultra-high pressure, a second seal 5 is also installed in the tightening gap. The second seal 5 is pressed and installed between the plastic liner 3 and the inner plug 2. By arranging the second seal 5 in the inclined tightening gap, when the first seal 4 is deformed under extreme temperature environment and ultra-high pressure, a second sealing surface is formed at the tightening gap between the inner plug 2 and the valve seat 1, which greatly compensates for the defect of gas cylinder leakage after the plastic liner 3 collapses.

[0034] In order to prevent the second seal 5 from being displaced during the installation of the inner plug 2, resulting in installation misalignment, a second sealing groove is provided at the position of the inner plug 2 facing the tightening gap, and the second seal 5 is fixedly installed in the second sealing groove, and the second seal 5 extends into the tightening gap. The second sealing groove is provided to limit the installation position of the second seal 5, thereby ensuring the stability of the position of the second seal 5 and thus ensuring the stability of the sealing effect of the second seal 5.

[0035] In this embodiment, the second seal 5 is a star-shaped seal ring or other shaped seal ring made of high-strength plastic material, and the side of the second seal 5 that cooperates with the plastic liner 3 is an arc surface. In order to prevent the first seal 4 and the second seal 5 from being excessively deformed, a retaining ring 6 is installed between the plastic liner 3 and the inner plug 2 in the tightening gap. After the plastic liner 3 is rotationally molded on the valve seat 1, a molding knife is used to cut the plastic liner 3 into the shape shown in the figure, and then a triangular retaining ring and a star-shaped seal ring are inserted into the inner plug 2 and screwed into the valve seat 1. The force generated by the deformation and rebound of the star-shaped seal ring is used to squeeze the plastic surface, and the metal surface is sealed simultaneously. In some other embodiments, the cross-section of the second seal 5 is circular.

[0036] In one embodiment, the installation gap is parallel to the axial direction of the inner plug 2, and the angle between the top tightening gap and the installation gap is 120°-150°. Specifically, in this embodiment, the angle between the top tightening gap and the installation gap is 135°, and the angle between the inclined surface on the inner side of the valve seat 1 and the axial direction of the valve seat 1 and the angle between the inclined surface on the inner plug 2 and the axial direction of the inner plug 2 are both 135°. In some other embodiments, the angle between the top tightening gap and the installation gap can be adjusted according to actual needs.

[0037] The four-type bottle liner sealing structure provided in this embodiment achieves the effect of preventing the liner from collapsing through the special structure of the inner plug 2, the valve seat 1 and the plastic liner 3. Among them, the external thread set on the inner plug 2 is connected to the internal thread set on the valve seat 1, and the inner plug 2 and the plastic liner 3 are sealed by a soft sealing ring and a retaining ring 6. The soft sealing ring will fit the plastic surface under the extrusion of the plastic liner 3 to achieve sealing. The retaining ring 6 can prevent the soft sealing ring from excessive deformation. The soft sealing ring and the retaining ring 6 form the first seal between the inner plug 2 and the plastic liner 3. Under high pressure and high temperature environment, the bottle mouth of the plastic liner 3 will be squeezed out of the bottle mouth, resulting in sealing failure. In order to compensate for such a situation and consider the feasibility of rotational molding, the valve seat 1 adopts a 135° inclined surface structure, and the plastic liner 3 is bonded to the inclined step on the valve seat 1. At this time, the inner plug 2 cooperates with the 135° inclined surface to resist the plastic liner 3 during the inward installation process, thereby strengthening the anti-creep effect of the plastic liner 3 through limiting and pre-tightening, and finally achieving the purpose of enhancing the sealing effect. In order to reduce the contact stress between the plastic liner 3 and the inclined surface on the inner plug 2, the contact mode between the soft retaining ring 6 made of engineering plastic and the soft sealing ring is adopted, and the rated compression amount of the sealing ring is agreed upon. The rebound force generated by compressing the soft sealing ring supports the inclined surface, thereby achieving soft contact between the inclined surface of the inner plug 2 and the plastic liner 3. At the same time, in conjunction with the metal sealing ring as the second sealing member 5, when the sealing ring is deformed, the metal sealing ring forms a second metal sealing surface between the metal inner plug 2 and the metal valve seat 1, which greatly compensates for the defect of gas cylinder leakage after the plastic liner 3 collapses. By generating a slope in the inner cavity part of the valve seat 1, the plastic liner 3 is pre-tightened by pressing against the inner cavity slope of the valve seat 1 when the inner plug 2 is installed, so as to prevent the collapse and deformation of the plastic liner 3. In addition, by forming two additional sealing surfaces of different properties between the valve seat 1 and the inner plug 2, the sealing of the gas cylinder after the plastic liner 3 collapses is enhanced. The soft contact preload force generated by the deformation of the soft sealing ring can effectively prevent the plastic liner 3 from being deformed prematurely due to excessive extrusion.

[0038] In the second aspect, the present invention also provides a four-type bottle, which has a four-type bottle liner sealing structure provided in this embodiment. By setting the bottle mouth end of the four-type bottle as a four-type bottle liner sealing structure, the inner plug 2 applies a pre-tightening force to the plastic liner 3 through the inclined structure, thereby ensuring a stronger anti-creep effect at the end of the plastic liner 3. After the plastic liner 3 collapses, it can also provide an effective metal sealing surface, which greatly improves the sealing performance of the gas cylinder; the extrusion of the inclined surface is achieved through the reaction force generated by the deformation of the metal sealing ring, which greatly reduces the stress concentration at the contact part. This pre-tightening force can be adjusted according to the actual process parameters, so as to achieve a stable and consistent pre-tightening force.

[0039] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A type IV bottle liner sealing structure, characterized in that: include: Valve seat (1); An inner plug (2) is installed in the inner cavity of the valve seat (1), the inner plug (2) and the valve seat (1) are sealed, an installation space is reserved between the end of the inner plug (2) facing the inner side of the valve seat (1) and the valve seat (1), the installation space includes an installation gap and a tightening gap, and the tightening gap is inclined toward the valve seat (1) relative to the installation gap; A plastic liner (3) is installed in the installation space, and the plastic liner (3) completely fills the installation space.

2. The four-type bottle liner sealing structure according to claim 1 is characterized in that: A first sealing member (4) is installed between the inner plug (2) and the plastic inner liner (3).

3. The four-type bottle liner sealing structure according to claim 2 is characterized in that: The inner plug (2) is provided with a first sealing groove at a position facing the installation gap, the first sealing member (4) is installed in the first sealing groove, and the first sealing member (4) extends from the first sealing groove into the installation space.

4. The four-type bottle liner sealing structure according to any one of claims 1 to 3, characterized in that: A second sealing member (5) is installed in the tightening gap, and the second sealing member (5) is pressed and installed between the plastic liner (3) and the inner plug (2).

5. The four-type bottle liner sealing structure according to claim 4 is characterized in that: The inner plug (2) is provided with a second sealing groove at a position facing the tightening gap, and the second sealing member (5) is fixedly installed in the second sealing groove, and the second sealing member (5) extends into the tightening gap.

6. The four-type bottle liner sealing structure according to claim 4 is characterized in that: The surface of the second sealing member (5) that cooperates with the plastic liner (3) is a curved surface.

7. The fourth-type bottle liner sealing structure according to any one of claims 1 to 3, characterized in that: The installation gap is parallel to the axial direction of the inner plug (2), and the angle between the tightening gap and the installation gap is 120°-150°.

8. The fourth-type bottle liner sealing structure according to any one of claims 1 to 3, characterized in that: In the tightening gap, a retaining ring (6) is installed between the plastic liner (3) and the inner plug (2).

9. The fourth-type bottle liner sealing structure according to any one of claims 1 to 3, characterized in that: The plastic liner (3) is fixedly matched with the valve seat (1).

10. A type IV bottle, characterized in that: A four-type bottle liner sealing structure having the structure described in any one of claims 1 to 9.

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