Gas storage bottle and forming method thereof

Abstract

The present invention discloses a gas storage cylinder and a forming method thereof, wherein the gas storage cylinder comprises: an inner liner, having an inner liner neck extending upward along the inner liner axis, a first thread being provided on the outer side wall of the inner liner neck, an inner liner through hole being provided on the inner liner neck, and the inner liner neck and the inner liner through hole being arranged concentrically with the inner liner axis; a valve seat, having a valve seat through hole arranged concentrically with the valve seat axis, a second thread being provided on the inner side wall of the valve seat through hole, the valve seat being sleeved on the outer periphery of the inner liner neck and being sealed and fitted with the first thread of the inner liner neck via the second thread; and a reinforcing ring, applying a radial expansion force to the inner liner neck to prevent deformation of the inner liner neck. The present invention can effectively ensure the concentricity of the valve seat and the inner liner, thereby effectively ensuring the connection strength and sealing between the valve seat and the inner liner. At the same time, because the valve seat is sleeved on the outside of the inner liner neck, the inner liner neck will be restricted by the valve seat when expanding and deforming outward in a high-temperature and high-pressure environment, thereby solving the problem of deformation of the inner liner bottle mouth.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure gas storage, and in particular to a gas storage bottle and a forming method thereof. Background Art

[0002] This section provides only background information related to the present disclosure and does not necessarily constitute prior art.

[0003] As an environmentally friendly and efficient new energy source, hydrogen energy has broad application prospects. Hydrogen storage requires the use of hydrogen storage cylinders. Currently, plastic liner carbon fiber fully wrapped hydrogen storage cylinders have gradually become the research focus due to their advantages such as light weight and high hydrogen storage density.

[0004] The plastic liner carbon fiber fully wrapped hydrogen storage cylinder consists of a plastic liner, a metal valve seat, and a fiber winding layer. The sealing method between the plastic liner and the metal valve seat is usually to press the metal valve seat directly into the interior of the plastic liner. However, during the process of pressing the metal valve seat into the interior of the plastic liner, the concentricity between the metal valve seat and the plastic liner cannot be guaranteed. If the pressed metal valve seat and the plastic liner are not concentric after being pressed in, the sealing effect and connection strength between the two will be affected. In addition, due to the difference in expansion coefficient between the plastic liner and the metal valve seat, the plastic liner will deform under high temperature and high pressure, creating a gap with the metal valve seat sealing surface, causing the sealing structure to fail, affecting the sealing performance of the plastic liner high-pressure gas storage cylinder. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the current sealing method between the plastic liner and the metal valve seat affects the concentricity, sealing effect and connection strength, thereby providing a gas storage cylinder and a molding method thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A gas storage cylinder, comprising:

[0008] An inner liner, comprising an inner liner neck extending upward along the inner liner axis, a first thread being provided on an outer side wall of the inner liner neck, an inner liner through hole being provided on the inner liner neck and communicating with the inner liner cavity, the inner liner neck and the inner liner through hole being arranged concentrically with the inner liner axis;

[0009] The valve seat has a valve seat through hole arranged concentrically with the valve seat axis, and a second thread is provided on the inner side wall of the valve seat through hole. The valve seat is sleeved on the outer periphery of the inner liner neck and is sealed and fitted with the first thread of the inner liner neck through the second thread;

[0010] The reinforcing ring is embedded in the inner liner through hole of the inner liner neck. The reinforcing ring is provided with a reinforcing ring through hole connected to the inner liner cavity. The reinforcing ring applies radial expansion force to the inner liner neck to prevent deformation of the inner liner neck.

[0011] To further optimize the technical solution, a first sealing ring is provided between the outer side wall of the reinforcement ring and the inner side wall of the liner neck.

[0012] Further optimizing the technical solution, the inner tank through hole includes a first stepped hole and a second stepped hole arranged in sequence from bottom to top, the inner diameter of the second stepped hole is larger than the inner diameter of the first stepped hole, a first limiting step is formed between the second stepped hole and the first stepped hole, and the reinforcement ring is embedded in the second stepped hole and is limited at the bottom by the first limiting step;

[0013] The top of the reinforcement ring is flush with the top of the inner liner neck, and a limiting structure is provided between the reinforcement ring and the top of the inner liner neck.

[0014] To further optimize the technical solution, the limiting structure includes a retaining ring, which is provided with a retaining ring extension portion extending downward, the retaining ring extension portion abuts against the inner side wall of the reinforcement ring, and the retaining ring is provided with a retaining ring through hole connected to the inner tank cavity.

[0015] To further optimize the technical solution, a second sealing ring is provided at the bottom of the retaining ring, and the second sealing ring is provided at the junction of the reinforcing ring and the neck of the inner liner.

[0016] To further optimize the technical solution, the second sealing ring is a rectangular sealing ring; and / or the material of the second sealing ring is polyurethane.

[0017] To further optimize the technical solution, the valve seat through hole is a stepped hole, and the valve seat through hole is divided into at least a third stepped hole and a fourth stepped hole from bottom to top, the second thread is opened on the inner side wall of the third stepped hole, the inner diameter of the fourth stepped hole is larger than the inner diameter of the third stepped hole, and a second limiting step is formed between the third stepped hole and the fourth stepped hole, and the retaining ring is arranged in the fourth stepped hole and is limited by the second limiting step.

[0018] To further optimize the technical solution, the retaining ring is assembled with the fourth step hole thread.

[0019] To further optimize the technical solution, the wall surface of the inner liner located beside the neck of the inner liner is recessed downward along the axis of the inner liner so that a valve seat receiving groove is formed at the top of the inner liner; the wall surface of the valve seat located beside the valve seat through hole protrudes downward along the valve seat axis and forms a valve seat protrusion, and the valve seat protrusion is assembled in the valve seat receiving groove; the outer wall surface of the valve seat and the outer wall surface of the inner liner are smoothly transitioned at the intersection of the two.

[0020] To further optimize the technical solution, fiber layers are sequentially provided on the outside of the inner liner and the valve seat, and the fiber layers are spirally wound layers and / or circumferentially wound layers.

[0021] A method for forming a gas storage cylinder comprises the following steps:

[0022] Injection molding of the liner: The liner is injection molded so that the liner neck extends upward along the liner axis and the liner through hole of the liner neck is connected to the liner cavity;

[0023] Processing of the inner liner neck: Processing the first thread of the inner liner neck;

[0024] Installation of the valve seat: Place the valve seat sleeve on the outer periphery of the inner liner neck, make the valve seat through hole concentric with the inner liner neck, and assemble the valve seat thread onto the inner liner neck.

[0025] Further optimizing the technical solution, in the step of processing the inner liner neck, further comprising: boring the inner liner through hole on the inner liner neck to form a first stepped hole and a second stepped hole in the inner liner through hole; embedding the reinforcement ring with the first sealing ring into the second stepped hole in the inner liner through hole;

[0026] and / or

[0027] After the valve seat is installed, the method further includes: installing a retaining ring with a second sealing ring to the top of the reinforcement ring and the neck of the inner liner, and allowing the second sealing ring to seal the gap at the intersection of the reinforcement ring and the neck of the inner liner;

[0028] and / or

[0029] After the valve seat is installed, the method further includes: winding fibers on the outside of the inner liner and the valve seat in a spiral winding layer and / or annular winding layer to form a fiber layer on the outside of the inner liner and the valve seat.

[0030] The technical solution of the present invention has the following advantages:

[0031] 1. The present invention provides a gas storage cylinder, which adopts a method of threaded connection between the valve seat and the inner liner to replace the method of pressing the valve seat into the inner liner. The valve seat and the inner liner are always in a concentric state during threaded assembly, which can effectively ensure the concentricity of the valve seat and the inner liner, and further effectively ensure the connection strength and sealing between the valve seat and the inner liner. At the same time, because the valve seat is sleeved on the outside of the neck of the inner liner, the neck of the inner liner will be restricted by the valve seat when it expands and deforms outward in a high-temperature and high-pressure environment, which can solve the problem of deformation of the bottle mouth of the inner liner.

[0032] A reinforcement ring is embedded inside the inner liner through hole of the inner liner neck. The reinforcement ring applies radial expansion force to the inner liner neck, which can prevent the inner liner neck from deforming inward when assembled with the valve seat thread, and can be used to reinforce the strength of the first thread of the inner liner, thereby increasing the connection strength between the metal valve seat and the plastic inner liner, and can effectively prevent the deformation of the inner liner thread and cause leakage of the gas cylinder, thereby ensuring the reliability of the connection between the valve seat and the inner liner; and because the reinforcement ring can prevent the deformation of the inner liner thread, it can also ensure the concentricity of the valve seat and the inner liner during threaded assembly.

[0033] 2. The present invention provides a gas storage cylinder, in which a first sealing ring is provided between the outer wall of the reinforcement ring and the inner wall of the inner liner neck. When the pressure inside the inner liner increases, the elasticity and compression variable of the first sealing ring form a seal to prevent hydrogen leakage.

[0034] 3. The present invention provides a gas cylinder in which a retaining ring is provided between the reinforcement ring and the top of the inner liner neck. The retaining ring is provided with a retaining ring extension extending downwardly. The retaining ring extension abuts the inner sidewall of the reinforcement ring. Thus, the retaining ring not only limits the reinforcement ring in the axial direction, but also limits the reinforcement ring in the radial direction. This strengthens the connection strength of the reinforcement ring to a certain extent and can prevent radial deformation of the reinforcement ring to a certain extent. The retaining ring can fix the position of the reinforcement ring, thereby ensuring the sealing performance of the sealing ring.

[0035] The retaining ring is made of aluminum alloy, and the retaining ring and the valve seat are threaded. Its main function is to fix the position of the reinforcement ring and prevent the reinforcement ring from displacement. As the tightening force of the retaining ring continues to increase, it can also ensure that the rectangular sealing ring at the bottom of the reinforcement ring fits tightly with the bottle mouth of the inner liner, thereby ensuring the sealing of the inner liner.

[0036] 4. In a gas storage cylinder provided by the present invention, a second sealing ring is provided at the bottom of the retaining ring. The second sealing ring is provided at the intersection of the reinforcing ring and the top of the inner liner neck, which can fill the tiny gap between the reinforcing ring and the inner liner, further improving the sealing performance and preventing hydrogen leakage.

[0037] 5. In the gas cylinder provided herein, the second sealing ring is made of polyurethane. This material resists deformation when squeezed by the retaining ring, ensuring a better seal. The second sealing ring is rectangular, increasing the contact area between the reinforcement ring and the inner liner, effectively sealing the slight gap between the reinforcement ring and the inner liner.

[0038] 6. In the gas cylinder provided by the present invention, the valve seat protrusion is assembled within the valve seat receiving groove, allowing the valve seat and the inner liner to nest with each other, reducing space usage. The outer wall of the valve seat and the outer wall of the inner liner form a smooth transition at the intersection, improving the integrity of the gas cylinder formed by the two.

[0039] 7. The present invention provides a gas storage cylinder in which the outer portion of the inner liner and the valve seat are both spirally and hoop-wound with fibers at different angles. The hoop-wrap can eliminate the hoop stress generated by the internal pressure of the gas cylinder, while the spiral wrapping can provide longitudinal pressure to the gas cylinder, thereby improving the overall performance of the gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A schematic structural diagram of a gas storage cylinder provided by the present invention;

[0042] Figure 2 A schematic structural diagram of an inner liner of a gas storage cylinder provided by the present invention;

[0043] Figure 3 A schematic structural diagram of a valve seat for a gas storage cylinder provided by the present invention;

[0044] Figure 4 A schematic structural diagram of a reinforcement ring of a gas storage cylinder provided by the present invention;

[0045] Figure 5 This is a structural schematic diagram of a gas storage bottle retaining ring provided by the present invention when assembled with a second sealing ring.

[0046] Reference numerals:

[0047] 1. Inner liner, 11. Inner liner neck, 12. Inner liner through hole, 13. Valve seat receiving groove, 2. Valve seat, 21. Valve seat through hole, 22. Valve seat protrusion, 3. Reinforcement ring, 4. Retaining ring, 41. Retaining ring extension, 42. Retaining ring through hole, 5. First sealing ring, 6. Second sealing ring, 7. Fiber layer. DETAILED DESCRIPTION

[0048] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the use of a threaded connection between the metal valve seat and the plastic inner liner to illustrate the gas cylinder of the present invention is only a preferred embodiment and does not limit the scope of protection of the gas cylinder.

[0049] It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, as used herein, the singular forms "a," "an," and "including" may also be intended to include the plural forms. The terms "comprising," "including," and "having" are inclusive and, therefore, specify the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0050] Although the terms first, second, etc. may be used herein to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply a sequence or order when used herein. In addition, in the description of the present invention, unless otherwise clearly specified and limited, the terms "set" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0051] For ease of description, spatial relative terms can be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "front", "back", "center", "inside", "longitudinal", "lateral", "side", "vertical", "outside", etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation other than the orientation depicted in the figure. For example, if the mechanism in the figure flips, the element described as "below other elements or features" or "below other elements or features" will then be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The mechanism can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0052] At present, plastic liner carbon fiber fully wrapped hydrogen storage cylinders have gradually become the research focus of hydrogen storage cylinders due to their advantages such as light weight and high hydrogen storage density.

[0053] The plastic liner carbon fiber fully wrapped hydrogen storage cylinder consists of a plastic liner, a metal valve seat, and a fiber winding layer. The sealing method between the plastic liner and the metal valve seat is usually to press the metal valve seat directly into the interior of the plastic liner. However, during the process of pressing the metal valve seat into the interior of the plastic liner, the concentricity between the metal valve seat and the plastic liner cannot be guaranteed. If the pressed metal valve seat and the plastic liner are not concentric after being pressed in, the sealing effect and connection strength between the two will be affected. In addition, due to the difference in expansion coefficient between the plastic liner and the metal valve seat, the plastic liner will deform under high temperature and high pressure, creating a gap with the metal valve seat sealing surface, causing the sealing structure to fail, affecting the sealing performance of the plastic liner high-pressure gas storage cylinder.

[0054] Based on this, the present invention designs a gas storage cylinder and a forming method thereof, in which the valve seat and the inner liner are sealed by a threaded connection. The valve seat and the inner liner are always in a concentric state during threaded assembly, thereby effectively ensuring the connection strength, sealing, and concentricity, and at the same time solving the problem of deformation of the inner liner bottle mouth.

[0055] The specific embodiments of the present invention are described in detail below in conjunction with the gas storage cylinder of the first aspect of the present invention.

[0056] It should be noted that the gas cylinder of the first aspect of the present invention is only a preferred embodiment of the present invention. The gas cylinder of the present invention can adopt the gas cylinder of the first aspect of the present invention or other structures. For the convenience of explanation, the gas cylinder of the first aspect of the present invention is described in detail below.

[0057] like Figures 1 to 5 As shown, this embodiment discloses a gas storage cylinder, which is a fully carbon fiber wrapped hydrogen storage cylinder with a plastic liner, comprising an liner 1 and a valve seat 2. The liner 1 has an liner neck 11 extending upward along the liner axis, a first thread being provided on the outer side wall of the liner neck 11, and an liner through hole 12 communicating with the liner cavity being provided on the liner neck 11. Both the liner neck 11 and the liner through hole 12 are arranged concentrically with the liner axis. The valve seat 2 has a valve seat through hole 21 concentrically with the valve seat axis, a second thread being provided on the inner side wall of the valve seat through hole 21, and the valve seat 2 is sleeved on the outer periphery of the liner neck 11 and is sealed and assembled with the first thread of the liner neck 11 via the second thread.

[0058] The inner liner 1 is a plastic inner liner, which is in direct contact with hydrogen and mainly plays a sealing role. The plastic inner liner has the advantages of good sealing, strong fatigue resistance, long cycle life and light weight. Injection molding is adopted, and plastic particles are formed into a plastic inner liner through an injection molding machine. The injection molding process ensures the concentricity of the inner liner bottle mouth and the barrel, which is conducive to the later installation of the valve seat and the inner liner. At the same time, it ensures the density of the inner liner bottle mouth and can ensure the uniformity and stability of the wall thickness of the inner liner. The inner liner bottle mouth is then threaded and bored by the machine tool. The valve seat 2 is a metal valve seat made of aluminum alloy or 304 stainless steel. It is easy to process and shape, and can ensure the molding accuracy. The metal valve seat and the plastic inner liner are threaded.

[0059] The above-mentioned gas storage cylinder adopts a method of threaded connection between the valve seat 2 and the inner liner 1 to replace the method of pressing the valve seat into the inner liner. The valve seat and the inner liner are always in a concentric state during threaded assembly, which can effectively ensure the concentricity of the valve seat 2 and the inner liner 1, and thus effectively ensure the connection strength and sealing between the valve seat 2 and the inner liner 1. At the same time, because the valve seat 2 is sleeved on the outside of the inner liner neck 11, the inner liner neck 11 will be restricted by the valve seat 2 when it expands and deforms outward in a high temperature and high pressure environment, which can solve the problem of deformation of the inner liner bottle mouth.

[0060] During the process of threading the valve seat 2 and the inner liner 1, the inner liner 1 is easily deformed because it is made of plastic. If the inner liner 1 is deformed, it will affect the sealing performance of the gas cylinder. Therefore, as a further improved embodiment, a reinforcing ring 3 is embedded in the inner liner through hole 12 of the inner liner neck 11. The reinforcing ring 3 is provided with a reinforcing ring through hole connected to the inner liner cavity. The reinforcing ring 3 applies a radial expansion force to the inner liner neck 11, which can prevent the inner liner neck 11 from deforming inward when threadedly assembled with the valve seat 2, and can be used to reinforce the strength of the first thread of the inner liner 1, thereby increasing the connection strength between the metal valve seat and the plastic inner liner, and can effectively prevent the deformation of the inner liner thread from causing leakage of the gas cylinder, thereby ensuring the reliability of the connection between the valve seat 2 and the inner liner 1. Moreover, because the reinforcing ring can prevent the deformation of the inner liner thread, it can also ensure the concentricity of the valve seat 2 and the inner liner 1 during threaded assembly.

[0061] More specifically, the material of the reinforcement ring 3 is preferably aluminum alloy. In addition, the material of the reinforcement ring 3 can also be other materials besides aluminum alloy.

[0062] In some embodiments, a first sealing ring 5 is disposed between the outer wall of the reinforcement ring 3 and the inner wall of the liner neck 11. When pressure increases within the liner, the elasticity and compression of the first sealing ring 5 create a seal, preventing hydrogen leakage. More specifically, a reinforcement ring groove is defined on the outer wall of the reinforcement ring 3, and the first sealing ring 5 is an O-ring that is embedded in the reinforcement ring groove.

[0063] In some embodiments, the liner through-hole 12 includes a first stepped hole and a second stepped hole, arranged sequentially from bottom to top. The inner diameter of the second stepped hole is larger than that of the first stepped hole. A first limiting step is formed between the second stepped hole and the first stepped hole. The reinforcement ring 3 is embedded in the second stepped hole and is limited at its bottom by the first limiting step. The top of the reinforcement ring 3 is flush with the top of the liner neck 11, and a limiting structure is provided between the reinforcement ring 3 and the top of the liner neck 11.

[0064] like Figure 5 As shown, in some embodiments, the retaining structure includes a retaining ring 4, which is provided with a retaining ring extension portion 41 extending downward. The retaining ring extension portion 41 abuts the inner sidewall of the reinforcement ring 3. Therefore, the retaining ring 4 not only limits the reinforcement ring 3 axially, but also limits the reinforcement ring 3 radially. This strengthens the connection strength of the reinforcement ring 3 to a certain extent and can prevent radial deformation of the reinforcement ring 3 to a certain extent. The retaining ring 4 can fix the position of the reinforcement ring 3, thereby ensuring the sealing performance of the sealing ring. The retaining ring 4 is provided with a retaining ring through hole 42 that communicates with the inner liner cavity.

[0065] In some embodiments, a second sealing ring groove is provided at the bottom of the retaining ring 4, and a second sealing ring 6 is provided in the second sealing ring groove. The second sealing ring 6 is provided at the intersection of the reinforcing ring 3 and the top of the inner liner neck 11, which can fill the tiny gap between the reinforcing ring 3 and the inner liner 1, further improving the sealing performance and preventing hydrogen leakage.

[0066] The second sealing ring 6 is made of polyurethane and is less likely to deform when squeezed by the retaining ring 4, providing a better seal. The second sealing ring 6 is a rectangular ring, which increases the contact area between the reinforcing ring 3 and the inner liner 1, effectively sealing the small gap between the reinforcing ring 3 and the inner liner 1.

[0067] The retaining ring 4 is made of aluminum alloy and is threadedly connected to the valve seat 2. Its main function is to fix the position of the reinforcing ring 3 to prevent the reinforcing ring 3 from displacement. As the tightening force of the retaining ring 4 continues to increase, it can also ensure that the rectangular sealing ring at the bottom of the reinforcing ring 3 fits tightly with the bottle mouth of the inner liner, thereby ensuring the sealing of the inner liner.

[0068] In some embodiments, the valve seat through hole 21 is a stepped hole, and the valve seat through hole 21 is divided into at least a third stepped hole and a fourth stepped hole from bottom to top. The second thread is opened on the inner wall of the third stepped hole, and the inner diameter of the fourth stepped hole is larger than the inner diameter of the third stepped hole. A second limiting step is formed between the third stepped hole and the fourth stepped hole, and the retaining ring 4 is arranged in the fourth stepped hole and is limited by the second limiting step.

[0069] In this embodiment, by setting the valve seat through hole 21 as a stepped hole and setting the retaining ring 4 in the form of a fourth stepped hole with a larger inner diameter, the retaining ring 4 can be used to effectively block the axial position of the reinforcement ring 3, thereby avoiding axial movement of the reinforcement ring 3.

[0070] In some embodiments, an external thread is provided on the outer wall of the retaining ring 4, and an internal thread is provided on the inner wall of the fourth stepped hole. The retaining ring 4 and the fourth stepped hole are threadedly assembled, making the assembly of the retaining ring 4 and the fourth stepped hole very convenient.

[0071] like Figure 2 As shown, in some embodiments, the wall surface of the inner container 1 located beside the inner container neck 11 is recessed downward along the inner container axis so that the top of the inner container 1 forms a valve seat receiving groove 13. Figure 3 As shown, the wall surface of the valve seat 2 located beside the valve seat through hole 21 protrudes downward along the valve seat axis to form a valve seat protrusion 22. The valve seat protrusion 22 is assembled into the valve seat receiving groove 13, so that the valve seat 2 is wrapped by the inner liner 1. That is, the valve seat 2 and the inner liner 1 are nested with each other, reducing space usage. The outer wall surface of the valve seat 2 and the outer wall surface of the inner liner 1 smoothly transition at the intersection between the two, allowing fibers to be wound around the outer surfaces of the inner liner 1 and the valve seat 2 in an orderly manner. The valve seat 2 and the inner liner 1 are not separated, which improves the integrity of the gas cylinder formed by the two.

[0072] In some embodiments, the outside of the inner liner 1 and the valve seat 2 are sequentially provided with a fiber layer 7, and the fiber layer 7 is a spirally wound layer and / or a hoop-wound layer, and the wound carbon fiber serves as a stress-bearing layer and the glass fiber serves as a protective layer. Hoop-wound means that the fibers are wound in the direction of the circumference of the container. The hoop-wound method can provide strong hoop-wound strength and is suitable for pressure vessels that withstand hoop-wound stress. The key to hoop-wound technology is to control the tension and winding angle of the fibers to ensure that the fibers are evenly distributed on the container. Spiral winding means that the fibers are wound along the path of a spiral line. The spiral winding method can provide strong axial strength and is suitable for pressure vessels that withstand axial stress. The key to spiral winding technology is to control the size of the spiral angle and the tension of the fibers to ensure that the fibers fit tightly on the container.

[0073] As a preferred embodiment, the outside of the inner liner 1 and the valve seat 2 are successively spirally wound and circumferentially wound with fibers at different angles. The circumferential winding can eliminate the circumferential stress generated by the internal pressure of the gas cylinder, and the spiral winding can provide longitudinal pressure to the gas cylinder, thereby improving the overall performance of the gas cylinder.

[0074] The specific embodiments of the present invention are described in detail below in conjunction with the gas cylinder molding method according to the second aspect of the present invention.

[0075] It should be noted that the forming method of the gas cylinder of the second aspect of the present invention is only a preferred embodiment of the present invention. The gas cylinder of the present invention can be manufactured using the method of the second aspect of the present invention or other methods. For the convenience of explanation, the forming method of the gas cylinder of the second aspect of the present invention is described in detail below.

[0076] This embodiment discloses a method for forming a gas storage cylinder, comprising the following steps:

[0077] Injection molding of the liner 1: The liner 1 is injection molded so that the liner neck 11 extends upward along the axis of the liner, and the liner through hole 12 of the liner neck 11 is connected to the liner cavity.

[0078] Processing of the inner liner neck 11: Use a professional lathe to perform thread processing on the inner liner bottle mouth to process the first thread of the inner liner neck 11.

[0079] The inner liner through hole 12 on the inner liner neck 11 is bored to form a first stepped hole and a second stepped hole in the inner liner through hole 12 .

[0080] Install the reinforcement ring 3 and the first sealing ring 5 to the mouth of the inner liner: insert the reinforcement ring 3 with the first sealing ring 5 into the second stepped hole of the inner liner through hole 12.

[0081] Installation of the valve seat 2: Sleeve the valve seat 2 around the outer periphery of the inner container neck 11 so that the valve seat through hole 21 is concentric with the inner container neck 11 , and thread the valve seat 2 onto the inner container neck 11 .

[0082] Install the retaining ring 4 and the second sealing ring 6: Install the retaining ring 4 with the second sealing ring 6 to the top of the reinforcement ring 3 and the inner liner neck 11, ensure that the reinforcement ring is installed in place, and make the second sealing ring 6 seal the gap at the junction of the reinforcement ring 3 and the inner liner neck 11.

[0083] Wrapped fiber layer 7: Carbon fibers are wound around the outside of the inner liner 1 and the valve seat 2 in a spiral winding manner as a stress-bearing layer, and glass fibers are wound around the outside of the inner liner 1 and the valve seat 2 in a circumferential winding manner as a protective layer.

[0084] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications derived therefrom remain within the scope of protection of the present invention.

Claims

1. A gas storage cylinder, characterized in that: include: An inner liner (1) has an inner liner neck (11) extending upward along the inner liner axis, a first thread is provided on the outer side wall of the inner liner neck (11), an inner liner through hole (12) communicating with the inner liner cavity is provided on the inner liner neck (11), and the inner liner neck (11) and the inner liner through hole (12) are both arranged concentrically with the inner liner axis; A valve seat (2) having a valve seat through hole (21) arranged concentrically with the valve seat axis, a second thread being provided on the inner side wall of the valve seat through hole (21), the valve seat (2) being sleeved on the periphery of the liner neck (11) and being sealed and assembled with the first thread of the liner neck (11) via the second thread; A reinforcing ring (3) is embedded in the inner liner through hole (12) of the inner liner neck (11), the reinforcing ring (3) is provided with a reinforcing ring through hole communicating with the inner liner cavity, and the reinforcing ring (3) applies a radial expansion force to the inner liner neck (11) to prevent the inner liner neck (11) from being deformed; The inner tank through hole (12) comprises a first stepped hole and a second stepped hole arranged in sequence from bottom to top, the inner diameter of the second stepped hole is larger than the inner diameter of the first stepped hole, a first limiting step is formed between the second stepped hole and the first stepped hole, and the reinforcing ring (3) is embedded in the second stepped hole and is limited at the bottom by the first limiting step; The top of the reinforcing ring (3) is flush with the top of the liner neck (11), and a limiting structure is provided between the reinforcing ring (3) and the top of the liner neck (11); The limiting structure comprises a retaining ring (4), the retaining ring (4) is provided with a retaining ring extension portion (41) extending downward, the retaining ring extension portion (41) abuts against the inner side wall of the reinforcing ring (3), and the retaining ring (4) is provided with a retaining ring through hole (42) communicating with the inner liner cavity; A second sealing ring (6) is provided at the bottom of the retaining ring (4), and the second sealing ring (6) is provided at the junction of the reinforcing ring (3) and the neck of the inner liner (11); The valve seat through hole (21) is a stepped hole, and the valve seat through hole (21) is divided into at least a third stepped hole and a fourth stepped hole from bottom to top, the second thread is provided on the inner side wall of the third stepped hole, the inner diameter of the fourth stepped hole is larger than the inner diameter of the third stepped hole, a second limiting step is formed between the third stepped hole and the fourth stepped hole, and the retaining ring (4) is provided in the fourth stepped hole and is limited by the second limiting step.

2. The gas cylinder according to claim 1, characterized in that: A first sealing ring (5) is provided between the outer side wall of the reinforcement ring (3) and the inner side wall of the liner neck (11).

3. The gas cylinder according to claim 1, characterized in that: The second sealing ring (6) is a rectangular sealing ring; and / or the second sealing ring (6) is made of polyurethane.

4. The gas cylinder according to claim 1, characterized in that: The retaining ring (4) is threadedly assembled with the fourth stepped hole.

5. The gas storage cylinder according to any one of claims 1 to 4, characterized in that: The wall surface of the inner liner (1) located beside the inner liner neck (11) is recessed downward along the axis of the inner liner so that a valve seat receiving groove (13) is formed at the top of the inner liner (1); the wall surface of the valve seat (2) located beside the valve seat through hole (21) protrudes downward along the valve seat axis to form a valve seat protrusion (22), and the valve seat protrusion (22) is assembled in the valve seat receiving groove (13); the outer wall surface of the valve seat (2) and the outer wall surface of the inner liner (1) are smoothly transitioned at the intersection of the two.

6. The gas storage cylinder according to any one of claims 1 to 4, characterized in that: Fiber layers (7) are sequentially provided on the outside of the inner container (1) and the valve seat (2), and the fiber layers (7) are spirally wound layers and / or hoop-wound layers.

7. A method for forming a gas cylinder, characterized in that: The method is a method for forming a gas cylinder according to any one of claims 1 to 6, comprising the following steps: Injection molding of the liner (1): injection molding the liner (1) so that the liner neck (11) extends upward along the liner axis, and the liner through hole (12) of the liner neck (11) is connected to the liner cavity; Processing of the liner neck (11): processing the first thread of the liner neck (11); Installation of the valve seat (2): The valve seat (2) is placed on the periphery of the inner liner neck (11), so that the valve seat through hole (21) is concentric with the inner liner neck (11), and the valve seat (2) is threadedly assembled onto the inner liner neck (11).

8. The method for forming a gas cylinder according to claim 7, characterized in that: The processing step of the liner neck (11) further includes: boring the liner through hole (12) on the liner neck (11) to form a first stepped hole and a second stepped hole in the liner through hole (12); and embedding the reinforcing ring (3) with the first sealing ring (5) into the second stepped hole of the liner through hole (12); and / or After the valve seat (2) is installed, the following steps are further included: installing the retaining ring (4) with the second sealing ring (6) to the top of the reinforcing ring (3) and the inner liner neck (11), and allowing the second sealing ring (6) to seal the gap at the junction of the reinforcing ring (3) and the inner liner neck (11); and / or After the valve seat (2) is installed, the method further includes: winding fibers in sequence on the outside of the inner liner (1) and the valve seat (2) in a spiral winding layer and / or a circumferential winding layer, so that a fiber layer (7) is formed on the outside of the inner liner (1) and the valve seat (2).

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