Winding gas cylinder with plastic inner container
By setting sealing grooves and connections between the bottle valve seat of the plastic inner liner and the inner liner, and using the S-type gap connection method, the problem of plastic deformation easily occurs under high pressure or after long-term use is solved, and a more reliable and stable sealing performance is achieved.
Patent Information
- Application Number
- CN202421384603.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-17
AI Technical Summary
Plastic inner liner is prone to plastic deformation under high pressure or after long-term use, resulting in failure of sealing at the sealing position.
By setting sealing grooves and connections between the bottle valve seat and the inner liner, and adopting an S-type gap connection method, the number of sealing positions is reduced and the sealing performance is enhanced.
It effectively reduces leakage risk points and ensures the reliability and stability of sealing performance throughout the life cycle between the bottle valve seat and the inner liner.
Smart Images
Figure CN222669646U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas cylinders, in particular to a gas cylinder wrapped with a plastic liner. Background Art
[0002] With the development of the hydrogen energy field at home and abroad, the storage and transportation link will be an important guarantee for the development of the entire hydrogen energy industry chain. The fully wrapped hydrogen cylinder with plastic liner has the advantages of light weight, high cylinder volume-to-weight ratio, high overall transportation efficiency, corrosion resistance, no hydrogen embrittlement problem, and long service life. It has become the focus of industry attention and also the cutting-edge technology for the development of the industry.
[0003] Due to the rigidity and sealing requirements of the connection between the mouth of the gas cylinder and the external pipe and valve, the mouth of the gas cylinder must be designed as a valve seat structure made of metal material. Therefore, the connection reliability, sealing and process stability of the metal valve seat and the plastic liner become a key technology for the fully wrapped hydrogen cylinder with plastic liner, and also the core competitiveness of the gas cylinder quality safety, stable batch production process and good reproducibility.
[0004] In a conventional connection structure between a metal valve seat and a plastic liner, an inner plug is usually installed. The installation of the inner plug increases the number of sealing positions and increases the risk points of leakage, which can easily lead to sealing failure at the sealing position. Utility Model Content
[0005] In view of this, the utility model provides a plastic liner wrapped around a gas cylinder to solve the problem that the plastic liner is prone to plastic deformation under high pressure or after long-term use, resulting in sealing failure at the sealing position.
[0006] The utility model provides a gas cylinder wrapped with a plastic liner, comprising an liner, a bottle valve seat and a sealing structure; the liner is provided with a bottle mouth, and a connecting portion is protruded from the bottle mouth; an interface is provided on the top of the bottle valve seat, and a sealing groove is provided around the bottom; the sealing groove comprises a first side wall and a second side wall arranged opposite to each other, the connecting portion is located in the sealing groove and connected to the first side wall; the sealing structure is arranged between the second side wall and the connecting portion.
[0007] Beneficial effect: Through the direct sealing connection between the bottle valve seat and the inner liner, and the interface is directly arranged on the bottle valve seat, that is, the bottle valve seat is an integrated structure, and the sealing performance requirement of the connection between the bottle valve seat and the inner liner can be achieved by one-time sealing through the sealing structure, which effectively reduces the number of sealing positions of the connection between the bottle valve seat and the inner liner, thereby reducing the risk of leakage points, and the sealing groove of the present application is plug-in connected to the connecting part, and the gap at the connection between the bottle valve seat and the connecting part is S-shaped. Compared with setting two bottle valve seats, gas is difficult to leak from the connection, further effectively ensuring the reliability and stability of the sealing performance of the connection between the bottle valve seat and the inner liner during the entire life cycle.
[0008] In an optional embodiment, the connection portion is provided with a support groove around the circumference, and a support portion is protruded around the circumference in the sealing groove; the support portion is inserted into the support groove.
[0009] Beneficial effects: Since the inner liner is made of plastic and has a relatively low hardness, the connecting portion is easily deformed by pressure when subjected to force in the sealing groove. By providing the supporting portion, a reverse supporting force can be provided for the second side wall when the connecting portion is subjected to force, so as to improve the inherent characteristic of the plastic inner liner that is easily deformed when subjected to pressure, and increase the stability of the second side wall; and the provision of the supporting groove and the supporting portion increases the number of S-shaped bends at the connection between the bottle valve seat and the connecting portion, further ensuring the sealing of the connection between the bottle valve seat and the connecting portion.
[0010] In an optional embodiment, a sealing structure is further included, a first groove is provided on the second side wall, the first groove is arranged circumferentially around the sealing groove, and the sealing structure is located in the first groove and abuts against the connecting portion.
[0011] Beneficial effect: By arranging the first groove on the second side wall, the installation of the sealing structure is facilitated, and the abutment between the sealing structure and the connecting portion can realize the sealing effect of the sealing structure when the inner liner and the bottle valve seat are connected.
[0012] In an optional embodiment, the sealing structure includes a retaining ring and an O-ring, and the retaining ring and the O-ring are arranged adjacent to each other in sequence along the axial direction of the inner container.
[0013] Beneficial effects: The O-ring has a simple structure, is easy to assemble and disassemble, and has reliable sealing performance; and by providing a retaining ring, the O-ring can be prevented from being squeezed into the gap between the second side wall and the connecting part, thereby preventing the occurrence of gap biting, thereby increasing the service life of the O-ring and greatly improving the sealing performance of the sealing structure.
[0014] In an optional embodiment, it also includes a limiting structure, which includes a plurality of blocks and a plurality of second grooves; the plurality of blocks are protruding from the bottom of the bottle valve seat and are arranged in sequence at intervals around the circumference of the bottle valve seat; the plurality of second grooves are arranged on the inner liner and are arranged in sequence at intervals around the outer circumference of the bottle mouth, and the blocks correspond to the second grooves in a one-to-one manner.
[0015] Beneficial effect: Through the setting of the block and the second groove, the close connection between the inner liner and the bottle valve seat can be ensured, the relative rotation between the bottle valve seat and the inner liner is prevented, the stability of the connection between the bottle valve seat and the inner liner is enhanced, and the sealing of the entire bottle body is safer and more reliable.
[0016] In an optional embodiment, the block includes a guide surface and a stop surface; the distance between the guide surface and the bottom of the bottle valve seat gradually increases toward the side close to the stop surface; and the side wall of the second groove close to the stop surface is snap-fitted with the stop surface.
[0017] Beneficial effects: The setting of the guide surface facilitates the mutual connection between the bottle valve seat and the inner liner, and during the connection process of the bottle valve seat and the inner liner, it is convenient for the block to slide into the second groove; the setting of the stop surface can achieve a snap-fit fit between the block and the second groove, so that the bottle valve seat can only be locked in the forward rotation relative to the inner liner, but cannot be rotated in the reverse direction, thereby achieving the purpose of locking the bottle valve seat relative to the inner liner along a single circumferential direction, and preventing relative rotation between the bottle valve seat and the inner liner after the connection, thereby ensuring the overall stability of the bottle body and ensuring the safety and reliability of the gas cylinder throughout its life cycle.
[0018] In an optional embodiment, the stopper is a triangular structure;
[0019] Beneficial effect: By setting the stopper as a triangular structure, the structure is simple and the guide surface and the stop surface are easy to form.
[0020] In an optional embodiment, the second groove is a rectangular groove.
[0021] Beneficial effect: By setting the second groove as a rectangular groove, the structure is simple and easy to manufacture, and it is convenient to cooperate with the guide surface and the stop surface.
[0022] In an optional embodiment, an inner concave surface is provided on the inner liner, and the inner concave surface is arranged around the outer circumference of the bottle mouth, and the bottom of the bottle valve seat is tightly fitted with the inner concave surface.
[0023] Beneficial effect: The bottom of the bottle valve seat fits tightly with the inner concave surface, which can make the connection between the bottle valve seat and the inner liner tighter, ensure the overall stability of the bottle body, and ensure the sealing and reliability of the connection between the bottle valve seat and the inner liner.
[0024] In an optional embodiment, the inner diameter of the connecting portion is larger than the inner diameter of the bottle mouth, and forms a first step portion with the bottle mouth; the bottom of the second side wall protrudes with an extension section, the outer diameter of the extension section is smaller than the outer diameter of the second side wall, and forms a second step portion with the second side wall, and the first step portion and the second step portion fit tightly.
[0025] Beneficial effect: The close fit between the first step portion and the second step portion allows a cavity-free fit between the bottle mouth and the extension section. During the inflation of the gas cylinder, the gas cannot flow between the bottle mouth and the extension section to form a cavity, thereby avoiding the generation of reverse force on the inner liner, thereby further ensuring the stability of the size of the sealing fit surface.
[0026] In an optional embodiment, the first side wall is threadedly connected to the connecting portion.
[0027] Beneficial effect: Through the threaded connection between the first side wall and the connecting part, a stable connection between the bottle valve seat and the inner liner can be achieved, and in cooperation with the stopper and the second groove, the bottle valve seat can be further locked relative to the inner liner along a single circumferential direction. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0029] Figure 1 This is a front view of the connection between the inner liner and the bottle valve seat of the embodiment of the utility model;
[0030] Figure 2 for Figure 1 AA section view shown;
[0031] Figure 3 It is a structural schematic diagram of the bottle mouth and the connecting part of the inner liner of an embodiment of the utility model;
[0032] Figure 4 It is a side view of the bottle mouth and the connecting part of the inner liner of the embodiment of the utility model;
[0033] Figure 5 for Figure 1 The BB section shown;
[0034] Figure 6 This is a structural schematic diagram of a bottle valve seat according to an embodiment of the utility model;
[0035] Figure 7 It is a side view of the bottle valve seat of the embodiment of the utility model;
[0036] Figure 8 for Figure 7 The CC section shown;
[0037] Fig. 9 for Figure 6A is a partial enlarged schematic diagram;
[0038] Fig.10 It is a top view of the bottle valve seat according to an embodiment of the utility model.
[0039] Description of reference numerals:
[0040] 1. Inner liner; 11. Bottle mouth; 12. Connecting part; 121. Support groove; 13. Inner concave surface; 2. Bottle valve seat; 21. Interface; 22. Sealing groove; 221. First side wall; 222. Second side wall; 2221. First groove; 2222. Extension section; 223. Supporting part; 3. Sealing structure; 31. Retaining ring; 32. O-ring; 41. Stopper; 411. Guide surface; 412. Stop surface; 42. Second groove. DETAILED DESCRIPTION
[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0042] Combine the following Figures 1 to 10 , describing an embodiment of the utility model.
[0043] According to an embodiment of the utility model, on the one hand, a plastic liner 1 wrapped around a gas cylinder is provided, comprising an liner 1, a bottle valve seat 2 and a sealing structure 3; the liner 1 is provided with a bottle mouth 11, and a connecting portion 12 is protruded from the bottle mouth 11; an interface 21 is provided on the top of the bottle valve seat 2, and a sealing groove 22 is provided circumferentially around the bottom; the sealing groove 22 comprises a first side wall 221 and a second side wall 222 arranged opposite to each other, the connecting portion 12 is located in the sealing groove 22, and is connected to the first side wall 221; the sealing structure 3 is arranged between the second side wall 222 and the connecting portion 12.
[0044] Through the direct sealing connection between the bottle valve seat 2 and the inner liner 1, and the interface 21 is directly arranged on the bottle valve seat 2, that is, the bottle valve seat 2 is an integrated structure, and the sealing performance requirement of the connection between the bottle valve seat 2 and the inner liner 1 can be achieved by one-time sealing through the sealing structure 3, which effectively reduces the number of sealing positions of the connection between the bottle valve seat 2 and the inner liner 1, thereby reducing the leakage risk points, and the sealing groove 22 of the present application is plug-connected with the connecting part 12, and the gap at the connection between the bottle valve seat 2 and the connecting part 12 is S-shaped. Compared with setting two bottle valve seats 2, gas is difficult to leak from the connection, further effectively ensuring the reliability and stability of the sealing performance of the connection between the bottle valve seat 2 and the inner liner 1 during the entire life cycle.
[0045] In a specific implementation, the bottle valve seat 2 is formed by machining using metal materials such as aluminum alloy tube, carbon steel, low alloy steel, or stainless steel.
[0046] In a specific embodiment, a valve or other connection device can be installed at the interface 21. Since the materials used to make the bottle valve seat 2 are different and their hardness is also different, the interface 21 can adopt a straight seal or a tapered thread seal according to the material of the bottle valve seat 2 to achieve compatibility between end face sealing and radial sealing.
[0047] In a specific embodiment, the plastic liner 1 is formed by plastic injection molding, blow molding or rotational molding, and the plastic can be polyethylene or polyamide or one of multi-layer adhesive structures, wherein the polyethylene includes modified polyethylene and the polyamide includes modified polyamide.
[0048] In one embodiment, the connection portion 12 is provided with a support groove 121 around the circumference, and a support portion 223 is protruded around the circumference in the sealing groove 22 ; the support portion 223 is inserted into the support groove 121 .
[0049] Since the inner liner 1 is made of plastic with low hardness, the connecting portion 12 is easily deformed under pressure when subjected to force in the sealing groove 22. By providing the support portion 223, a reverse support force can be provided for the second side wall 222 when the connecting portion 12 is subjected to force, so as to improve the inherent characteristic of the plastic inner liner 1 that it is easy to deform when subjected to pressure, and increase the stability of the second side wall 222; and the provision of the support groove 121 and the support portion 223 increases the number of S-shaped bends at the connection between the bottle valve seat 2 and the connecting portion 12, further ensuring the sealing of the connection between the bottle valve seat 2 and the connecting portion 12.
[0050] In one embodiment, a sealing structure 3 is further included. A first groove 2221 is provided on the second side wall 222 . The first groove 2221 is circumferentially arranged around the sealing groove 22 . The sealing structure 3 is located in the first groove 2221 and abuts against the connecting portion 12 .
[0051] The first groove 2221 is provided on the second side wall 222 to facilitate installation of the sealing structure 3 , and the abutment between the sealing structure 3 and the connecting portion 12 can achieve a sealing effect of the sealing structure 3 when the inner liner 1 and the bottle valve seat 2 are connected.
[0052] In one embodiment, the sealing structure 3 includes a retaining ring 31 and an O-ring 32 , and the retaining ring 31 and the O-ring 32 are disposed adjacent to each other in sequence along the axial direction of the inner container 1 .
[0053] The O-ring 32 has a simple structure, is easy to assemble and disassemble, and has reliable sealing performance. By providing a retaining ring 31, the O-ring 32 can be prevented from being squeezed into the gap between the second side wall 222 and the connecting portion 12, thereby preventing gap biting from occurring, thereby increasing the service life of the O-ring 32 and greatly improving the sealing performance of the sealing structure 3.
[0054] In one embodiment, a limiting structure is also included, which includes a plurality of blocks 41 and a plurality of second grooves 42; the plurality of blocks 41 are protrudingly arranged at the bottom of the bottle valve seat 2, and are arranged in sequence at intervals around the circumference of the bottle valve seat 2; the plurality of second grooves 42 are arranged on the inner liner 1, and are arranged in sequence at intervals around the outer circumference of the bottle mouth 11, and the blocks 41 correspond to the second grooves 42 one by one.
[0055] By setting the block 41 and the second groove 42, the tight connection between the inner liner 1 and the bottle valve seat 2 can be ensured, and relative rotation between the bottle valve seat 2 and the inner liner 1 can be prevented, thereby enhancing the stability of the connection between the bottle valve seat 2 and the inner liner 1 and making the sealing of the entire bottle body safer and more reliable.
[0056] In one embodiment, the block 41 includes a guide surface 411 and a stop surface 412; toward the side close to the stop surface 412, the distance between the guide surface 411 and the bottom of the bottle valve seat 2 gradually increases; the side wall of the second groove 42 close to the stop surface 412 is snap-fitted with the stop surface 412.
[0057] The setting of the guide surface 411 facilitates the mutual connection between the bottle valve seat 2 and the inner liner 1, and during the connection process of the bottle valve seat 2 and the inner liner 1, it is convenient for the stop block 41 to slide into the second groove 42; the setting of the stop surface 412 can achieve a snap-fit fit between the stop block 41 and the second groove 42, so that the bottle valve seat 2 can only be rotated and locked relative to the inner liner 1 in the forward direction, and cannot be rotated out in the reverse direction, thereby achieving the purpose of locking the bottle valve seat 2 relative to the inner liner 1 along a single circumferential direction, and preventing the bottle valve seat 2 from rotating relative to the inner liner 1 after being connected, thereby ensuring the overall stability of the bottle body and the safety and reliability of the gas cylinder throughout its life cycle.
[0058] In one embodiment, the stopper 41 is a triangular structure;
[0059] By providing the stopper 41 with a triangular structure, the structure is simple and the guide surface 411 and the stop surface 412 are easy to form.
[0060] Specifically, the stopper 41 is a right triangle structure, the inclined surface of the right triangle structure is the guide surface 411, one right angle side is fixedly connected to the bottom of the bottle valve seat 2, and the other right angle side is the stop surface 412. In an alternative embodiment, the stopper 41 can also be a trapezoid.
[0061] In one embodiment, the second groove 42 is a rectangular groove.
[0062] By configuring the second groove 42 as a rectangular groove, the structure is simple and easy to manufacture, and it is convenient to cooperate with the guide surface 411 and the stop surface 412 .
[0063] In one embodiment, the inner liner 1 is provided with an inner concave surface 13 , which is arranged around the outer circumference of the bottle mouth 11 , and the bottom of the bottle valve seat 2 is tightly fitted with the inner concave surface 13 .
[0064] The bottom of the bottle valve seat 2 fits tightly with the inner concave surface 13 , which can make the connection between the bottle valve seat 2 and the inner liner 1 tighter, ensure the overall stability of the bottle body, and ensure the sealing and reliability of the connection between the bottle valve seat 2 and the inner liner 1 .
[0065] In a specific embodiment, the second groove 42 is disposed on the inner concave surface 13 .
[0066] In one embodiment, the inner diameter of the connecting portion 12 is larger than the inner diameter of the bottle mouth 11, and forms a first step portion with the bottle mouth 11; the bottom of the second side wall 222 is protruded with an extension section 2222; the outer diameter of the extension section 2222 is smaller than the outer diameter of the second side wall 222, and forms a second step portion with the second side wall 222; the first step portion and the second step portion fit tightly.
[0067] Through the close fit between the first step portion and the second step portion, a cavity-free fit is achieved between the bottle mouth 11 and the extension section 2222. During the inflation of the gas cylinder, the gas cannot flow between the bottle mouth 11 and the extension section 2222 to form a cavity, thereby avoiding the generation of a reverse force on the inner liner 1, thereby further ensuring the stability of the size of the sealing fitting surface.
[0068] In one embodiment, the first side wall 221 is threadedly connected to the connecting portion 12 .
[0069] The threaded connection between the first side wall 221 and the connecting portion 12 can achieve a secure connection between the bottle valve seat 2 and the inner liner 1, and in cooperation with the stopper 41 and the second groove 42, the bottle valve seat 2 can be further locked relative to the inner liner 1 along a single circumferential direction.
[0070] Although the embodiments of the present invention are 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 plastic liner wrapped gas cylinder, characterized in that: include: The inner container (1) is provided with a bottle mouth (11), and a connecting portion (12) is protruding from the bottle mouth (11); A bottle valve seat (2) is provided with an interface (21) at the top and a sealing groove (22) circumferentially arranged at the bottom; the sealing groove (22) comprises a first side wall (221) and a second side wall (222) arranged opposite to each other, and the connecting portion (12) is located in the sealing groove (22) and connected to the first side wall (221); A sealing structure (3) is provided between the second side wall (222) and the connecting portion (12).
2. The plastic liner wrapped gas cylinder according to claim 1, characterized in that: The connection portion (12) is provided with a supporting groove (121) in a circumferential direction, and a supporting portion (223) is provided protruding in a circumferential direction in the sealing groove (22); the supporting portion (223) is inserted into the supporting groove (121).
3. The plastic liner wrapped gas cylinder according to claim 1, characterized in that: It also includes a sealing structure (3), wherein a first groove (2221) is provided on the second side wall (222), the first groove (2221) is arranged circumferentially around the sealing groove (22), and the sealing structure (3) is located in the first groove (2221) and abuts against the connecting portion (12).
4. The plastic liner wrapped gas cylinder according to claim 3, characterized in that: The sealing structure (3) comprises a retaining ring (31) and an O-ring (32), wherein the retaining ring (31) and the O-ring (32) are arranged adjacent to each other in sequence along the axial direction of the inner container (1).
5. The plastic liner wrapped gas cylinder according to any one of claims 1 to 4, characterized in that: It also includes a limiting structure, which includes: A plurality of stoppers (41) are protrudingly arranged on the bottom of the bottle valve seat (2) and are arranged in sequence and spaced apart in the circumferential direction of the bottle valve seat (2); A plurality of second grooves (42) are arranged on the inner liner (1) and are arranged in sequence and at intervals around the outer circumference of the bottle mouth (11); the stopper (41) and the second grooves (42) are matched one by one.
6. The plastic liner wrapped gas cylinder according to claim 5, characterized in that: The stopper (41) comprises a guide surface (411) and a stop surface (412); towards the side close to the stop surface (412), the distance between the guide surface (411) and the bottom of the bottle valve seat (2) gradually increases; and the side wall of the second groove (42) close to the stop surface (412) is snap-fitted with the stop surface (412).
7. The plastic liner wrapped gas cylinder according to claim 6, characterized in that: The stopper (41) is a triangular structure; And / or, the second groove (42) is a rectangular groove.
8. The plastic liner wrapped gas cylinder according to any one of claims 1 to 4 or 6 or 7, characterized in that: The inner liner (1) is provided with an inner concave surface (13), the inner concave surface (13) is arranged around the outer circumference of the bottle mouth (11), and the bottom of the bottle valve seat (2) is tightly fitted with the inner concave surface (13).
9. The plastic liner wrapped gas cylinder according to any one of claims 1 to 4 or 6 or 7, characterized in that: The inner diameter of the connecting portion (12) is larger than the inner diameter of the bottle mouth (11), and forms a first step portion with the bottle mouth (11); the bottom of the second side wall (222) is protrudingly provided with an extension section (2222); the outer diameter of the extension section (2222) is smaller than the outer diameter of the second side wall (222), and forms a second step portion with the second side wall (222); the first step portion and the second step portion fit tightly together.
10. The plastic liner wrapped gas cylinder according to any one of claims 1 to 4 or 6 or 7, characterized in that: The first side wall (221) is threadedly connected to the connecting portion (12).