Gas cylinder and gas storage device

Abstract

The utility model provides a gas cylinder and a gas storage device. The gas cylinder comprises a cylinder body and a winding layer, the bottle body comprises an inner container with at least one open end and a valve seat arranged at the open end of the inner container, the valve seat comprises a body with an air duct and an extending body protruding outwards in the radial direction of the body, the extending body extends in the axial direction of the body, and the extending body is connected with the open end of the inner container in an inserted mode in the axial direction of the inner container. An air cavity communicated with the air passage is defined between the air inlet and the air outlet; and the inserted inner container and the valve seat are wound together by the winding layer. According to the gas cylinder, the extending body is connected with the open end of the inner container in the axial direction of the inner container in the inserted mode, so that the diameter of the connecting position of the valve seat and the inner container is increased to be equal to that of the inner container, and compared with the scheme that the diameter of the connecting position of the valve seat and the inner container is obviously smaller than that of the inner container in the prior art; the low-position angle of the winding layer in the winding process can be increased, the using amount of the winding layer can be reduced on the premise that the strength requirement of the gas cylinder is met, and forming of the gas cylinder is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gas storage products, in particular to a gas cylinder; meanwhile, the utility model also relates to a gas storage device provided with the gas cylinder. Background Art

[0002] Gas cylinders in the prior art are used to store gas, such as hydrogen cylinders for storing hydrogen. Currently, seamless aluminum liner is mainly used, but it is heavy. In order to reduce the weight of the gas cylinder, a fully wrapped gas cylinder with a plastic liner can be used, which has excellent properties such as light weight, high strength, and corrosion resistance. The gas cylinder in the prior art usually includes an inner liner, a valve seat, and a wrapping layer. The valve seat is arranged at the bottle mouth of the inner liner, and the outer peripheral surface of the valve seat is provided with a radially raised flange part. The wrapping layer is arranged on the outer side of the inner liner and the valve seat, and the wrapping layer is connected to the flange part.

[0003] Since the diameter of the flange part of the valve seat is smaller than the diameter of the inner liner, the low angle during the winding process is smaller when the winding layer is wrapped around the flange part and the inner liner. In order to meet the strength requirements of the gas cylinder, more winding layers are used. This problem is more obvious on gas cylinders with a large aspect ratio (for example, the ratio of the length to the diameter of the bottle body is greater than 4). Utility Model Content

[0004] In view of this, the utility model aims to provide a gas cylinder, so as to reduce the amount of winding layer and facilitate the molding of the gas cylinder.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A gas cylinder comprises a bottle body and a winding layer; the bottle body comprises an inner liner with at least one end open, and a valve seat arranged at the open end of the inner liner, the valve seat comprises a main body with an air vent, and an extension body protruding radially outwardly along the main body, and the extension body is extended along the axial direction of the main body, the extension body is plugged and connected to the open end of the inner liner along the axial direction of the inner liner, and an air cavity connected to the air vent is formed between the two; the winding layer wraps the inserted inner liner and the valve seat together.

[0007] Furthermore, one of the extension body and the open end of the inner liner is provided with an insertion block protruding outwardly along the axial direction of the air cavity, and the other is provided with an insertion groove for inserting the insertion block.

[0008] Furthermore, the insertion groove is arranged on the inner wall of the open end of the inner liner, and the insertion block is arranged on the extension body corresponding to the insertion groove; in the inserted state, the abutment surface between the inner liner and the extension body is stepped.

[0009] Furthermore, a guide surface is provided on the insertion block, and a matching surface adapted to the guide surface is provided in the insertion slot, and the guide surface is used to guide the insertion block to be inserted into the insertion slot.

[0010] Furthermore, the insertion block and the insertion slot are both in a ring shape arranged along the circumference of the air cavity.

[0011] Furthermore, a sealing member is provided between the inner container and the extension body to form a seal therebetween.

[0012] Furthermore, the inner liner is made of plastic material, and the valve seat is made of metal material; and / or, an impermeable layer is provided on the inner wall of the inner liner.

[0013] Furthermore, the extension body has an extension portion extending along the axial direction of the inner container, and a connecting portion connected between the extension portion and the main body, and an anti-slip structure for preventing the winding layer from sliding is provided on the outer wall of the connecting portion.

[0014] Furthermore, the anti-slip structure includes an annular groove provided on the connecting portion along the circumference of the connecting portion, and the annular groove is a plurality of grooves arranged in sequence along the radial direction of the connecting portion.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The gas cylinder described in the utility model is provided with an extension body on the valve seat which is radially protruding outward along the main body and extending along the axial direction of the main body. The extension body is plug-connected with the open end of the inner liner along the axial direction of the inner liner, so that the diameter of the connection between the valve seat and the inner liner is increased to be equivalent to that of the inner liner. Compared with the solution in the prior art in which the diameter of the connection between the valve seat and the inner liner is significantly smaller than the diameter of the inner liner, it is beneficial to increase the low angle of the winding layer during the winding process, and can reduce the amount of the winding layer while meeting the strength requirements of the gas cylinder, and is beneficial to the molding of the gas cylinder.

[0017] In addition, another object of the present invention is to provide a gas storage device, comprising the gas cylinder as described above.

[0018] The gas storage device of the utility model is convenient for processing and forming by arranging the gas cylinder as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the internal structure of the gas cylinder according to an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the bottle body according to an embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of a part of the internal structure of the inner container according to an embodiment of the utility model;

[0023] Figure 4 It is a schematic diagram of the internal structure of the valve seat described in the embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Inner tank; 2. Valve seat; 3. Wrapping layer;

[0026] 100, bottle body; 101, insertion slot; 102, matching surface; 103, open mouth;

[0027] 200, air passage; 201, body; 202, extension body; 2021, extension part; 2022, connection part; 2023, plug-in block; 2024, anti-slip structure; 2025, guide surface; 203, sealing member;

[0028] 300. Air cavity. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] This embodiment relates to a gas cylinder, which is beneficial to reduce the usage of the winding layer 3 and facilitate the molding of the gas cylinder by optimizing the valve seat 2 and the inner liner 1.

[0033] In terms of overall structure, the gas cylinder includes a bottle body 100 and a winding layer 3. The bottle body 100 includes an inner liner 1 with at least one end open 103, and a valve seat 2 provided at the open end of the inner liner 1. The valve seat 2 includes a body 201 having an air passage 200, and an extension body 202 protruding radially outward from the body 201, and the extension body 202 is extended along the axial direction of the body 201. The extension body 202 is plugged and connected to the open end of the inner liner 1 along the axial direction of the inner liner 1, and an air cavity 300 communicating with the air passage 200 is formed between the two. The winding layer 3 winds the plugged inner liner 1 and the valve seat 2 together.

[0034] The gas cylinder described in this embodiment is provided with an extension body 202 which is radially protruding outward along the body 201 and extending along the axial direction of the body 201 on the valve seat 2, and the extension body 202 is plug-connected with the open end of the inner liner 1 along the axial direction of the inner liner 1, so that the diameter of the connection between the valve seat 2 and the inner liner 1 is increased to be equivalent to the inner liner 1. Compared with the solution in the prior art in which the diameter of the connection between the valve seat 2 and the inner liner 1 is significantly smaller than the diameter of the inner liner 1, it is beneficial to increase the low angle (usually refers to the smaller angle among the winding angles) of the winding layer 3 during the winding process, and can reduce the amount of the winding layer 3 on the premise of meeting the strength requirements of the gas cylinder, and is beneficial to the molding of the gas cylinder.

[0035] Based on the above overall introduction, an exemplary structure of the gas cylinder described in this embodiment is as follows: Figure 1 and Figure 2 As shown in . The inner liner 1 is in a straight cylindrical shape, and both ends thereof have the above-mentioned openings 103, and the valve seats 2 are respectively arranged at each open end. Of course, the solution that the inner liner 1 has only one opening 103 is also feasible, in which case one end of the inner liner 1 has an opening 103, the other end is blocked, and the valve seat 2 is arranged at the open end. In specific implementation, the number of openings 103 on the inner liner 1 can be determined according to the use requirements, and the number of valve seats 2 and the number of open ends are matched.

[0036] The structure of the valve seat 2 in this embodiment is as follows Figure 2 and Figure 4As shown in , due to the provision of the air passage 200, the main body 201 is cylindrical and serves as the air inlet and outlet of the entire gas cylinder. The axial direction of the main body 201 refers to the direction of the axis of the main body 201, and the radial direction of the main body 201 refers to the direction perpendicular to the axial direction of the main body 201. The extension body 202 protrudes outward along the radial direction of the main body 201, so that the diameter of the extension body 202 is greater than the diameter of the main body 201. Specifically, the extension body 202 has an extension portion 2021 extending along the axial direction of the inner liner 1, and a connecting portion 2022 connected between the extension portion 2021 and the main body 201, and the extension portion 2021 is used to be connected to the open end of the inner liner 1. Among them, the connecting portion 2022 has a smooth transition, and its diameter is gradually reduced in the direction close to the main body 201. As a feasible implementation, the diameter of the extension part 2021 is equivalent to that of the inner liner 1, that is, the inner diameter and outer diameter of the inner liner 1 are respectively the same as the inner diameter and outer diameter of the extension part 2021, which is conducive to the consistency of the bottle body 100 in the inserted state.

[0037] As a preferred embodiment, one of the extension body 202 and the open end of the inner liner 1 is provided with an insertion block 2023 protruding outwardly along the axial direction of the air cavity 300, and the other is provided with an insertion slot 101 for inserting the insertion block 2023. The insertion block 2023 and the insertion slot 101 have simple structures, and the insertion operation of the two is easy, and they are convenient for processing and forming.

[0038] In terms of specific structure, Figures 2 to 4 As shown in , the insertion slot 101 is provided on the inner wall of the open end of the inner liner 1, and the insertion block 2023 is provided on the extension body 202 corresponding to the insertion slot 101. In the inserted state, the abutment surface between the inner liner 1 and the extension body 202 is stepped. Among them, the inner peripheral wall of the insertion slot 101 is provided through the inner peripheral wall of the inner liner 1, so that the insertion slot 101 has notches provided respectively toward the insertion block 2023 and the inner part of the inner liner 1. The insertion block 2023 is provided protruding from the end surface of the extension part 2021, and part of the end surface of the extension part 2021 is located outside the insertion block 2023.

[0039] Reference Figure 1 As shown in , when the insertion block 2023 and the insertion slot 101 are in the insertion state, the free end of the insertion block 2023 abuts against the bottom of the insertion slot 101, and the end face of the extension part 2021 abuts against the corresponding end face of the inner liner 1 to form the above-mentioned abutment surface, and the abutment surface is stepped. The arrangement of the insertion slot 101 and the insertion block 2023 in this embodiment is conducive to the arrangement and implementation on the extension part 2021 and the inner liner 1, and has a good insertion effect. The abutment surface of the extension part 2021 and the inner liner 1 is stepped, which is conducive to further increasing the contact area between the two, thereby improving the insertion stability of the two.

[0040] In order to further improve the insertion effect between the extension body 202 and the inner liner 1, the insertion block 2023 and the insertion slot 101 are both annularly arranged along the circumference of the air cavity 300. At this time, by increasing the insertion area between the insertion block 2023 and the insertion slot 101, it is beneficial to improve the stability and reliability of the insertion, and it is convenient for arrangement and implementation. Of course, the insertion slots 101 are arranged at intervals along the circumference of the inner liner 1, and the insertion blocks 2023 are arranged on the extension part 2021. The scheme in which each insertion block 2023 is arranged in a one-to-one correspondence with the insertion slot 101 is also feasible.

[0041] As a preferred embodiment, a guide surface 2025 is provided on the insertion block 2023, and a matching surface 102 adapted to the guide surface 2025 is provided in the insertion slot 101, and the guide surface 2025 is used to guide the insertion block 2023 to be inserted into the insertion slot 101. The provision of the guide surface 2025 and the matching surface 102 not only helps to improve the insertion efficiency of the insertion block 2023 and the insertion slot 101, but also improves the stability of the two in the inserted state.

[0042] In terms of specific structure, Figure 3 and Figure 4 As shown in , the guide surface 2025 is provided on the outer peripheral surface of the free end of the insertion block 2023, and is in the shape of a truncated cone with the smaller diameter end facing the insertion slot 101, so that the diameter of the free end of the insertion block 2023 is minimized, thereby facilitating insertion into the insertion slot 101. The mating surface 102 is specifically provided at the bottom of the insertion slot 101, and the matching of the mating surface 102 and the guide surface 2025 means that the bottom of the insertion slot 101 is also in the shape of a truncated cone, and the guide surface 2025 in the inserted state can abut against the mating surface 102.

[0043] In addition, in addition to being set on the inner wall of the inner liner 1, the insertion groove 101 can also be set on the end face of the open end of the inner liner 1, and be located between the outer peripheral wall and the inner peripheral wall of the inner liner 1. At this time, the insertion block 2023 is still set on the end face of the extension part 2021, and is set one by one with the insertion groove 101. By inserting the insertion block 2023 and the insertion groove 101, the connection requirements between the inner liner 1 and the extension body 202 can also be met.

[0044] It should be noted that, in a specific implementation, the insertion slot 101 can also be set on the extension part 2021, and the insertion block 2023 can be set on the inner liner 1. At this time, the insertion requirements between the extension body 202 and the inner liner 1 can also be met by the insertion of the insertion block 2023 and the insertion slot 101.

[0045] As a preferred embodiment, a sealing member 203 is provided between the inner liner 1 and the extension body 202 to form a seal therebetween. The provision of the sealing member 203 is conducive to improving the sealing effect of the connection between the inner liner 1 and the extension body 202. Specifically, the sealing member 203 is provided between the insertion block 2023 and the insertion slot 101. Figure 2 and Figure 4 As shown in , an annular groove is provided on the outer periphery of the insertion block 2023 along the circumferential direction of the extension body 202, and the sealing member 203 is preferably a sealing ring sleeved in the annular groove. As the insertion block 2023 and the insertion slot 101 are inserted, the sealing ring is sandwiched between the outer peripheral wall of the insertion block 2023 and the peripheral wall of the insertion slot 101, and the two are sealed, which is easy to arrange and implement, and has the advantages of good sealing effect.

[0046] The winding layer 3 in this embodiment is mainly composed of carbon fibers wound around the valve seat 2 and the inner liner 1. In specific operation, the bottle body 100 inserted together needs to be fixed on the winding machine, and the bottle body 100 is in a pressurized state, and then the bottle body 100 is wound as a whole. Among them, the molding method of the winding layer 3 can refer to the existing technology. In order to protect the winding layer 3 composed of carbon fibers, a glass fiber winding layer 3 composed of glass fibers can be added outside the winding layer 3 composed of carbon fibers.

[0047] In order to improve the winding effect of the winding layer 3, in this embodiment, an anti-skid structure 2024 for preventing the winding layer 3 from sliding is provided on the outer wall of the connecting portion 2022. The anti-skid structure 2024 is provided to increase the friction between the connecting portion 2022 and the winding layer 3, thereby preventing the winding layer 3 at the connecting portion 2022 from sliding off, and further ensuring the winding effect of the winding layer 3.

[0048] As a feasible implementation method, Figure 4 As shown in , the anti-skid structure 2024 includes an annular groove provided on the connecting portion 2022 along the circumference of the connecting portion 2022, and the annular groove is a plurality of annular grooves arranged in sequence along the radial direction of the connecting portion 2022. On the axial cross section at the connecting portion 2022, the plurality of annular grooves are in a wavy shape connected in sequence. The structure of the annular grooves here is simple, easy to implement, and has a good anti-skid effect. In particular, for gas cylinders with an aspect ratio greater than 4 and a diameter less than 200 mm, the anti-skid effect of the anti-skid structure 2024 is more obvious. Of course, the anti-skid structure 2024 can also adopt other structural forms that are conducive to increasing the friction between the connecting portion 2022 and the winding layer 3 in addition to the annular groove.

[0049] The inner liner 1 in this embodiment is made of plastic material, and the valve seat 2 is made of metal material, which is conducive to the lightweight design of the gas cylinder and further helps to reduce production costs. Taking into account the effect of the gas cylinder when used as a hydrogen storage cylinder, the material of the inner liner 1 in this embodiment needs to have a certain rigidity and should also have a relatively low hydrogen permeability. For example, the inner liner 1 is made of nylon PA6, PA11, PA12, etc. For the fully wrapped gas cylinder with a plastic inner liner 1 with lower pressure, the material of the plastic inner liner 1 is often made of high-density polyethylene. Of course, the material of the inner liner 1 can also be selected according to the use requirements. The valve seat 2 can be made of aluminum alloy, for example, to have a better service life and facilitate lightweight design.

[0050] In order to further improve the storage effect of the gas cylinder on hydrogen, an impermeable layer can be provided on the inner wall of the inner liner 1 to prevent hydrogen from penetrating into the inner liner 1 and affecting the performance of the gas cylinder. As a feasible implementation, the impermeable layer is provided on the inner liner 1 by spraying. The material of the impermeable layer can be PVDF (polyvinylidene fluoride), PVDC (polyvinylidene chloride), EVOH (ethylene-vinyl alcohol copolymer), etc., preferably EVOH (ethylene-vinyl alcohol copolymer). Of course, the inner wall of the inner liner 1 can also be fluorinated or sulfonated according to the use requirements.

[0051] During the processing of the gas cylinder in this embodiment, the inner liner 1 and the valve seat 2 are first formed separately, and an anti-seepage layer is sprayed on the inner wall of the inner liner 1, and then the sealing ring is installed in the annular groove, and then the insertion block 2023 and the insertion groove 101 are inserted together to complete the assembly of the bottle body 100. The bottle body 100 is fixed on the winding machine, and carbon fiber is wound on the bottle body 100. During the winding process, the bottle body 100 is ensured to be in a pressurized state. After the winding, the gas cylinder is cured in a curing device to obtain a gas cylinder.

[0052] The gas cylinder in this embodiment, by optimizing the structure and connection method of the valve seat 2 and the inner liner 1, not only simplifies the structure and installation process of the gas cylinder, but also reduces the amount of the winding layer 3, and has a better use effect. In addition, it can also avoid the defect of inconsistent shrinkage caused by the inner liner 1 using one-piece injection molding in the prior art, thereby further improving the use performance of the gas cylinder.

[0053] In addition, the present embodiment also relates to a gas storage device, including the gas cylinder as described above. For example, the gas storage device is used to store hydrogen, in which case the gas cylinder can be a hydrogen storage cylinder. Of course, the gas cylinder can also store other gases according to usage requirements, as long as the usage requirements are met.

[0054] The gas storage device described in this embodiment is convenient for processing and forming by providing the gas cylinder as described above.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas cylinder, characterized in that: It comprises a bottle body (100) and a winding layer (3); The bottle body (100) comprises an inner liner (1) with at least one end open (103), and a valve seat (2) arranged at the open end of the inner liner (1), the valve seat (2) comprising a main body (201) having an air passage (200), and an extension body (202) protruding outwardly along the radial direction of the main body (201), and the extension body (202) extending along the axial direction of the main body (201), the extension body (202) being plug-connected with the open end of the inner liner (1) along the axial direction of the inner liner (1), and an air cavity (300) communicating with the air passage (200) is formed between the two; The winding layer (3) winds the inserted inner liner (1) and the valve seat (2) together.

2. The gas cylinder according to claim 1, characterized in that: One of the extension body (202) and the open end of the inner liner (1) is provided with an insertion block (2023) convexly arranged along the axial direction of the air cavity (300), and the other is provided with an insertion groove (101) for inserting the insertion block (2023).

3. The gas cylinder according to claim 2, characterized in that: The insertion groove (101) is arranged on the inner wall of the open end of the inner container (1), and the insertion block (2023) is arranged on the extension body (202) corresponding to the insertion groove (101); In the inserted state, the abutment surface between the inner container (1) and the extension body (202) is in a step shape.

4. The gas cylinder according to claim 2, characterized in that: The insertion block (2023) is provided with a guide surface (2025), the insertion slot (101) is provided with a matching surface (102) adapted to the guide surface (2025), and the guide surface (2025) is used to guide the insertion block (2023) to be inserted into the insertion slot (101).

5. The gas cylinder according to claim 2, characterized in that: The insertion block (2023) and the insertion slot (101) are both in an annular shape and are arranged along the circumference of the air cavity (300).

6. The gas cylinder according to claim 1, characterized in that: A sealing member (203) is provided between the inner container (1) and the extension body (202) to form a seal therebetween.

7. The gas cylinder according to claim 1, characterized in that: The inner container (1) is made of plastic material, and the valve seat (2) is made of metal material; and / or, An impermeable layer is provided on the inner wall of the inner container (1).

8. The gas cylinder according to any one of claims 1 to 7, characterized in that: The extension body (202) comprises an extension portion (2021) extending along the axial direction of the inner liner (1), and a connection portion (2022) connected between the extension portion (2021) and the main body (201), and an anti-slip structure (2024) for preventing the winding layer (3) from sliding is provided on the outer wall of the connection portion (2022).

9. The gas cylinder according to claim 8, characterized in that: The anti-slip structure (2024) comprises an annular groove provided on the connecting portion (2022) along the circumference of the connecting portion (2022), and the annular groove is a plurality of grooves arranged in sequence along the radial direction of the connecting portion (2022).

10. A gas storage device, characterized in that: A gas cylinder comprising the gas cylinder according to any one of claims 1 to 9.

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