V-shaped gas storage bottle and process

Abstract

A bottle body of the V-shaped gas storage bottle is composed of a carbon fiber layer, and one end of the bottle body is in an end socket shape; a valve seat with a composite structure is arranged at the end part of the other end of the bottle body and comprises a reinforcing layer formed by a carbon fiber material; the inner valve seat is bonded and fixed on the outer side of the reinforcing layer, and the carbon fiber layer wraps the inner valve seat, so that the inner valve seat is clamped between the carbon fiber layer and the reinforcing layer; the outer valve seat is arranged on the inner valve seat; and the sealing ring is used for sealing the valve seat. The valve seat interlayer arrangement at the end and the integrally-formed sealing connector are optimized, and the performance and reliability of the valve seat area are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure gas storage containers, and in particular to a V-shaped gas storage bottle and a process. Background Art

[0002] Filament-wound composite pressure vessels, such as Type IV (fully wound with a plastic liner) and Type V (fully wound without a liner), have been widely used in the storage of high-pressure gases (such as hydrogen and natural gas) due to their excellent strength-to-weight ratio, corrosion resistance, and design flexibility. V-shaped vessels, by completely eliminating the liner, offer advantages such as lighter weight, lower cost potential, and wider gas compatibility, making them a key development direction for high-pressure gas storage vessels in the future.

[0003] However, existing V-shaped gas cylinders have the following key structural issues in the integration area between the cylinder body and the metal valve seat, which affect their sealing reliability and long-term safety:

[0004] 1. The thermal expansion coefficients of the metal valve seat and the carbon fiber composite bottle body differ significantly. During the high-temperature curing and cooling processes of the resin matrix, significant shrinkage stresses are generated at the interface between the two. This can easily lead to microcracks and even macroscopic delamination at the bonding interface, severely compromising sealing performance. The risk is particularly high in the bottle neck seal area, where stress is concentrated. Existing structural designs are unable to fundamentally address this thermal mismatch.

[0005] 2. The final valve seat sealing interface typically involves a sealing surface machined from the composite material and a pipe thread machined from the metal seat. Existing designs typically require these features to be machined in stages, and multiple clamping inevitably introduces cumulative errors, resulting in misalignment between the sealing surface and the central axis of the pipe thread. This misalignment causes uneven force on the sealing ring during installation of the external valve seat, which can easily lead to leakage.

[0006] 3. Traditional V-shaped bottles feature standard ellipsoidal heads at both ends. At the end where the valve seat is to be installed, the curved surface of the head provides an irregular base for bonding the embedded valve seat or reinforcement structure, making it difficult to position and securely bond the pre-embedded valve seat. This increases the risk of structural failure and limits the optimal design of the valve seat area.

[0007] 4. V-shaped bottles rely on removable core molds. Traditional demolding methods (such as mechanical demolding) can easily damage the surface finish and even the structural integrity of the bottle's inner cavity. Some soluble core molds also suffer from incomplete or inefficient dissolution, leaving residue that can affect bottle performance. Summary of the Invention

[0008] In response to the problems of poor sealing reliability, insufficient processing accuracy and structural failure risk in the integrated area of ​​the valve seat of V-shaped gas cylinders in the existing technology, the present invention provides a V-shaped gas cylinder and process. The gas cylinder uses a composite structure valve seat, optimized end valve seat interlayer arrangement and one-piece molded sealing interface, which significantly improves the performance and reliability of the valve seat area.

[0009] The present invention achieves the above technical objectives through the following technical means.

[0010] A V-shaped gas cylinder, wherein the cylinder body is composed of a carbon fiber layer, one end of the cylinder body is in a head shape; the other end of the cylinder body has a valve seat with a composite structure, and the valve seat with a composite structure comprises:

[0011] A reinforcement layer formed of carbon fiber material;

[0012] An inner valve seat is adhesively fixed to the outer side of the reinforcing layer, and the carbon fiber layer wraps the inner valve seat inside thereof, so that the inner valve seat is sandwiched between the carbon fiber layer and the reinforcing layer;

[0013] An outer valve seat mounted on an inner valve seat;

[0014] Sealing ring for valve seat sealing.

[0015] Furthermore, the reinforcing layer is bonded to the inner cavity of the other end of the bottle body, the inner surface of the reinforcing layer has a reinforcing layer semi-head section and a reinforcing layer curved surface section, the inner cylindrical surface of the inner cavity of the bottle body is smoothly connected to the reinforcing layer semi-head section, and the reinforcing layer semi-head section and the reinforcing layer curved surface section on the reinforcing layer are connected.

[0016] Furthermore, the inner surface of the reinforcement layer is formed by the inner liner of the molded bottle body cavity.

[0017] Furthermore, a sealing surface matching the sealing ring is provided on the reinforcement layer, and the sealing surface and the pipe thread interface on the inner valve seat are formed in one step, and the pipe thread interface is used for docking with the outer valve seat.

[0018] Furthermore, the sealing ring is a conical sealing ring.

[0019] Furthermore, the reinforcing layer and the inner valve seat are pre-installed on the inner liner of the molded bottle body cavity, and the inner valve seat is wrapped inside the carbon fiber layer through a winding process.

[0020] A process for producing the V-shaped gas cylinder comprises the following steps:

[0021] Making an inner liner for winding a V-shaped bottle, wherein a winding core rod is pre-embedded in the inner liner;

[0022] Apply glue on the surface of the formed inner liner and cure it;

[0023] Bonding a reinforcement layer to the other end of the liner;

[0024] An inner valve seat made of metal is bonded to the outside of the reinforcement layer;

[0025] A carbon fiber layer is wound around the outside of the inner liner. During the winding process, the outer side of the inner valve seat is wrapped in the carbon fiber layer, so that the inner valve seat is arranged between the carbon fiber layer and the reinforcement layer;

[0026] The wound V-shaped bottle is solidified as a whole;

[0027] After curing is completed, the liner is dissolved and the winding mandrel is removed to form a V-shaped bottle shell with an inner valve seat;

[0028] At the air inlet of the V-shaped bottle shell with an inner valve seat, the sealing surface and the pipe thread interface are machined in one step;

[0029] An outer valve seat and a sealing ring are installed at the air inlet of a V-shaped bottle shell with an inner valve seat.

[0030] The beneficial effects of the present invention are:

[0031] 1. The V-shaped gas cylinder described in this invention effectively mitigates the risk of delamination in the valve seat area and improves sealing reliability. This invention sandwiches the metal inner valve seat between a carbon fiber layer and a carbon fiber reinforcement layer. Because both the wrapping layer and the reinforcement layer are composed of carbon fiber composite materials with identical thermal expansion coefficients, their shrinkage rates are consistent during the high-temperature curing and cooling process. This fundamentally eliminates the interfacial stress concentration and delamination risk caused by differential thermal expansion between the metal and composite materials. The reinforcement layer acts as an intermediate layer, isolating the direct impact of differential thermal expansion of the metal valve seat on the primary sealing interface, significantly improving the long-term sealing reliability and service life of the valve seat area in high-pressure environments.

[0032] 2. The V-shaped gas cylinder described in this invention features a standard end cap on one end of the liner and a structure comprising a semi-end cap section and a curved section on the other. This structure, while ensuring that the reinforcement layer forms an effective pressure-bearing end at the other end, creates a flat or regularly transitioned bonding reference surface (curved section). This allows the carbon fiber reinforcement layer to be firmly and reliably bonded to the liner, providing a solid foundation for subsequent valve seat installation and overall carbon fiber layer wrapping. This solves the bonding difficulties and interface failure issues associated with directly installing the valve seat on a conventional liner with fully end caps on both ends.

[0033] 3. The V-shaped gas cylinder described in this invention utilizes a single-clamping process to form the sealing surface (machined on the end face of the reinforcement layer) and the pipe thread interface (machined on the metal inner valve seat). This structure and manufacturing method ensure extremely high concentricity between the sealing surface and the pipe thread interface, completely eliminating the cumulative errors caused by secondary clamping. The tapered sealing ring is evenly and coaxially compressed against the sealing surface by the outer valve seat, greatly improving the static and dynamic sealing performance of the valve seat interface and significantly reducing the risk of high-pressure gas leakage.

[0034] 4. The V-shaped gas cylinder described in this invention features an inner liner structure that allows for complete dissolution and removal during the manufacturing process by injecting hot water, enabling non-destructive demolding. This process avoids damage to the carbon fiber structure within the cylinder during mechanical demolding, ensuring the integrity and smoothness of the product's inner cavity, positively impacting the performance and lifespan of the cylinder.

[0035] 5. The V-shaped gas cylinder described in this invention, through the provision of a reinforcement layer combined with an optimized end structure, and then fully wrapped with a precisely controlled carbon fiber layer, including the complete wrapping of the valve seat area, significantly enhances the overall structural strength, rigidity, and pressure-bearing capacity of the V-shaped gas cylinder, enabling it to safely and reliably withstand higher internal pressures.

[0036] 6. In the V-shaped gas cylinders described in this invention, the valve seat is precisely positioned and integrated into the cylinder structure during the initial manufacturing phase, eliminating errors in subsequent assembly. The critical sealing interface is machined in a single pass, ensuring precision. All of this contributes to the consistent and stable performance of the final gas cylinder product. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a cross-sectional view of the V-shaped gas storage cylinder of the present invention.

[0039] Figure 2 The figure is a flow chart of the manufacturing process of the V-shaped bottle of the present invention.

[0040] Figure 3 This is a structural diagram of the inner liner described in the present invention.

[0041] Figure 4 This is a schematic diagram of the reinforcement layer installed outside the inner liner according to the present invention.

[0042] Figure 5This is a schematic diagram of the installation of the inner valve seat according to the present invention.

[0043] Figure 6 This is a schematic diagram of the inner liner of the present invention after being wrapped with a carbon fiber layer.

[0044] Figure 7 This is a schematic diagram of a V-shaped bottle shell with an inner valve seat for removing the inner liner according to the present invention.

[0045] Figure 8 This is a schematic diagram of the processing position of the air inlet of the V-shaped bottle shell with an inner valve seat according to the present invention.

[0046] Figure 9 This is a schematic diagram of the V-shaped bottle mouth after the outer valve seat and sealing ring are installed according to the present invention.

[0047] In the picture:

[0048] 1-Inner liner; 1-1-Cavity; 1-2-Semi-end section; 1-3-Curved surface section; 2-Wrapped mandrel; 3-Carbon fiber layer; 4-Reinforcement layer; 4-1-Semi-end section of reinforcement layer; 4-2-Curved surface section of reinforcement layer; 5-Inner valve seat; 5-1-Sealing surface; 5-2-Pipe thread interface; 6-Sealing ring; 7-Outer valve seat; 8-Bottle body. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] like Figure 1 As shown, the V-shaped gas cylinder described in the present invention is generally a medium-low pressure gas cylinder, and the pressure generally does not exceed 20Mpa. The V-shaped gas cylinder described in the present invention has a bottle body 8 mainly composed of a dense carbon fiber layer 3 wrapped around it. The carbon fiber layer 3 is a liner-free structure formed after the water-soluble liner 1 is dissolved and removed after curing. One end of the bottle body 8 is in a standard head shape; the other end of the bottle body 8 has a valve seat of a composite structure, which includes a reinforcement layer 4 formed of carbon fiber material, an inner valve seat 5 of a metal material bonded to the outside of the reinforcement layer 4, and a carbon fiber layer 3 wrapping the other end of the bottle body; the carbon fiber layer 3 completely wraps the inner valve seat 5 inside it, so that the inner valve seat 5 is sandwiched between the carbon fiber layer 3 and the reinforcement layer 4.

[0053] In one embodiment, Figure 1 As shown, one end of the bottle body 8 is a standard ellipsoid or other suitable pressure-bearing end-sealed shape, formed directly from a carbon fiber layer 3. The other end (the air inlet) of the bottle body 8 features a composite valve seat. This composite valve seat comprises a carbon fiber reinforcement layer 4, a metal inner valve seat 5 bonded to the reinforcement layer 4, and the carbon fiber layer 3 wrapping around the other end of the bottle body.

[0054] like Figure 7 As shown, the reinforcing layer 4 is bonded to the inner cavity of the other end of the bottle body 8, and the inner surface of the reinforcing layer 4 includes a reinforcing layer semi-head section 4-1 and a reinforcing layer curved surface section 4-2. The inner surface of the reinforcing layer 4 refers to the surface in contact with the inner cavity of the bottle body 8. The reinforcing layer semi-head section 4-1 is generally a portion of the complete head shape. The reinforcing layer curved surface section 4-2 is connected to the reinforcing layer semi-head section 4-1, and its surface is relatively flat or has a regular transition curve. The inner cylindrical surface of the inner cavity of the bottle body 8 is smoothly connected to the reinforcing layer semi-head section 4-1 at this point. The reinforcing layer semi-head section 4-1 and the reinforcing layer curved surface section 4-2 on the reinforcing layer 4 correspond one-to-one with the semi-head section 1-2 and the curved surface section 1-3 on the cross section of the other end of the liner 1. It can also be considered that the reinforcing layer semi-head section 4-1 and the reinforcing layer curved surface section 4-2 on the reinforcing layer 4 are determined by the cross section of the other end of the liner 1. In this way, the reinforcing layer 4 and the inner cavity of the bottle body 8 have high pressure bearing capacity.

[0055] The carbon fiber layer 3 wrapping the other end of the bottle body can be understood here as a portion of the carbon fiber layer 3 that constitutes the bottle body 8. This carbon fiber layer 3 not only wraps the cylindrical section and standard end cap of the bottle body 8, but also completely wraps the valve seat of the composite structure (including the reinforcement layer 4 and the inner valve seat 5 bonded thereto). Therefore, the inner valve seat 5 is securely sandwiched and encapsulated between the carbon fiber layer 3 and the reinforcement layer 4. It can be understood that the outer ring of the inner valve seat 5 is covered by the carbon fiber layer 3, and the bottom mounting side of the inner valve seat 5 is completely covered between the carbon fiber layer 3 and the reinforcement layer 4. However, the inner ring of the inner valve seat 5 may be partially uncovered by the carbon fiber layer 3 and the reinforcement layer 4, because the pipe thread interface 5-2 required for connection to the outer valve seat 7 will be processed later, resulting in the inner ring of the inner valve seat 5 not having the reinforcement layer 4. This "sandwich" structure is the key to solving the thermal mismatch problem. Because both the carbon fiber layer 3 and the reinforcement layer 4 are constructed from carbon fiber materials, their thermal expansion coefficients are consistent, resulting in the same shrinkage rate during the subsequent high-temperature curing and cooling process. This avoids sealing issues at the installation interface of the inner valve seat 5 caused by different shrinkage rates. Alternatively, the reinforcement layer 4 and the carbon fiber layer 3 completely isolate the inner valve seat 5, and the ultimate sealing performance depends primarily on the seal and sealing interface between the inner valve seat 5 and the outer valve seat 7.

[0056] A sealing surface 5-1 matching the sealing ring 6 is provided on the reinforcement layer 4 of the valve seat of the composite structure. The sealing surface 5-1 and the pipe thread interface 5-2 on the inner valve seat 5 are processed and formed in the same clamping and positioning (for example, by turning or milling) to ensure the concentricity of the two and avoid the assembly error caused by secondary processing affecting the sealing performance of the sealing ring. A conical sealing ring 6 is placed on the sealing surface 5-1. The outer valve seat 7 is screwed and connected to the pipe thread interface 5-2 on the inner valve seat 5 through its internal thread. When the outer valve seat 7 is tightened, its end (usually a cylindrical surface) moves axially and squeezes the conical sealing ring 6. The sealing ring 6 deforms under axial pressure, tightly filling and sealing between the outer valve seat 7 and the sealing surface 5-1 of the reinforcement layer 4. The high concentricity of the one-time processing ensures that the sealing ring 6 is evenly stressed and the sealing effect is optimal.

[0057] The bottle body 8 is formed by winding the carbon fiber layer 3 on the outside of the inner liner 1. In order to achieve the structure in which the reinforcement layer 4 is located inside the inner valve seat 5 and the carbon fiber layer 3 is located outside the inner valve seat 5, the reinforcement layer 4 and the inner valve seat 5 are pre-installed on the inner liner 1. This allows the reinforcement layer 4 and the carbon fiber layer 3 to completely isolate the inner valve seat 5 during the winding process. The inner liner 1 is then dissolved through a subsequent hydrolysis process. Therefore, the manufacturing process of the V-shaped gas cylinder described in the present invention is as follows: Figure 2 As shown, the following steps are included:

[0058] S01: Make the inner liner for wrapping V-shaped bottles, specifically:

[0059] The inner liner 1 is made of water-soluble material through centrifugal rotation and pressurization process. The shape of the inner liner 1 matches the inner cavity of the corresponding model of V-shaped bottle; the center of the inner liner 1 is provided with a cavity 1-1 for weight reduction, and the inner liner 1 is pre-embedded with a winding mandrel 2. One end of the winding mandrel 2 extends out of one side of the inner liner 1, and the other end of the winding mandrel 2 can contact or be inserted into the cavity 1-1; the winding mandrel 2 is provided with a channel connected to the cavity 1-1 for adding hot water to dissolve the inner liner 1 later. Figure 3 shown.

[0060] After the inner liner 1 is formed, it is subjected to a preliminary drying process. Conventional inner liner designs have both ends in a head shape to meet the optimal pressure-bearing requirements. However, if a metal valve seat is installed at one end, due to the difference in thermal expansion coefficient between the metal valve seat and the subsequently wound carbon fiber layer 3, after high-temperature curing and cooling, the shrinkage is inconsistent and may cause delamination, thereby affecting the sealing effect. Therefore, Figure 2 As shown, after forming, the inner liner 1 of the present invention has a head-end shape at one end, while the cross-section of the other end of the inner liner 1 includes a semi-head section 1-2 and a curved surface section 1-3. The semi-head section 1-2 is a partial head-end shape, and the outer cylindrical surface of the inner liner 1 is smoothly connected to the semi-head section 1-2, which is then connected to the curved surface section 1-3. This allows the curved surface section 1-3 to be directly bonded to the reinforcement layer 4, and the reinforcement layer 4 can cover the semi-head section 1-2.

[0061] S02: Coating silicone on the surface of the inner liner 1 and curing it. Its function is to isolate the carbon fiber layer 3 from the inner liner 1 in the later stage to facilitate demoulding.

[0062] S03: If Figure 4 As shown, a reinforcing layer 4 of carbon fiber material is bonded to the curved surface section 1-3 at the other end of the liner 1. The reinforcing layer 4 covers the curved surface section 1-3 and extends to the semi-end section 1-2. By bonding the reinforcing layer 4, the semi-end section 1-2 and the reinforcing layer 4 covering it together form the end shape of the other end of the liner 1. Figure 4 There is a gap between the middle reinforcing layer 4 and the winding core rod 2, so as to facilitate the removal of the winding core rod 2 during the later hot water dissolution process of the inner liner 1. The reinforcing layer 4 can be a single layer or a multi-layer.

[0063] S04: Bond the inner valve seat 5 of the metal material to the outside of the reinforcement layer 4. At this time, one end of the inner liner 1 is bonded to the inner valve seat 5 through the reinforcement layer 4. Figure 5 At this stage, the inner valve seat 5 is a semi-finished product and has not yet been processed with pipe threads for connecting to the outer valve seat.

[0064] S05: If Figure 6As shown, a carbon fiber layer 3 is wound around the exterior of the inner liner 1, encasing the inner valve seat 5. The inner liner 1 (along with the bonded reinforcement layer 4 and inner valve seat 5) is placed on a winding machine. The winding mandrel 2 is connected to a rotating mechanism, causing the inner liner 1 to rotate. The winding machine evenly wraps the carbon fiber layer 3 around the exterior of the inner liner 1. During this process, the ambient temperature and humidity are strictly controlled to ensure the bond between the inner liner 1 and the carbon fiber layer 3. Multiple layers of carbon fiber are wound around the exterior of the inner liner 1 according to a pre-designed winding path and angle (including longitudinal spiral winding and alternating circumferential winding). During the winding process, the fiber tension, winding speed, and interlayer compaction are precisely controlled to ensure that each layer of fiber is tightly bonded, forming a uniform and dense carbon fiber layer 3. During the winding process, the winding path planning and interlayer compaction techniques ensure that the inner valve seat 5 is completely enclosed within the carbon fiber layer 3, achieving good bonding and integrity between the carbon fiber layer 3 and the inner valve seat 5.

[0065] In the present invention, the inner valve seat 5 is positioned between the carbon fiber layer 3 and the reinforcement layer 4. Since both carbon fiber layers 3 and 4 are composed of carbon fiber materials, their thermal expansion coefficients are consistent, resulting in the same shrinkage rate during the subsequent high-temperature curing and cooling process. This avoids sealing issues at the inner valve seat 5 installation interface caused by different shrinkage rates. Alternatively, the reinforcement layer 4 and carbon fiber layer 3 completely isolate the inner valve seat 5, and the ultimate sealing performance depends primarily on the seal and sealing interface between the inner valve seat 5 and the outer valve seat 7.

[0066] S06: Curing treatment: The wrapped V-shaped bottle is placed in a curing oven for curing treatment.

[0067] S07: Dissolve the liner and remove the core rod. After curing is completed, hot water is added to the cavity 1-1 of the liner 1 that has been wrapped with the carbon fiber layer 3 through the channel of the winding core rod 2. Under the action of pressure and temperature, the water-soluble liner 1 gradually dissolves into a solution and separates from the carbon fiber layer 3. The dissolved matter is then discharged. After the winding core rod 2 is removed, a V-shaped bottle shell with an inner valve seat is formed, as shown in FIG. Figure 7 shown.

[0068] S08: Processing the inner valve seat sealing surface and interface. At the air inlet of the V-shaped bottle shell with the inner valve seat (i.e., the end formed by the inner valve seat 5 and the reinforcement layer 4), the sealing surface 5-1 and the pipe thread interface 5-2 are machined (such as turning or milling). The sealing surface 5-1 and the pipe thread interface 5-2 should be machined and formed in one step to ensure their concentricity and avoid assembly errors caused by secondary processing that affect the sealing performance of the sealing ring. Figure 8 As shown in the figure, the sealing surface 5-1 is processed on the end surface formed by the reinforcement layer 4, and the pipe thread interface 5-2 is processed on the inner valve seat 5.

[0069] S09: Install the outer valve seat and the sealing ring; place the conical sealing ring 6 on the sealing surface 5-1, and screw the outer valve seat 7 into the inner valve seat 5 through the pipe thread interface 5-2. During the tightening process, the cylindrical surface at one end of the outer valve seat 7 moves axially to squeeze the conical sealing ring 6, so that the sealing ring 6 is tightly filled and sealed between the outer valve seat 7 and the inner valve seat 5. Figure 9 shown.

[0070] S10: Post-processing and quality inspection. Perform post-processing on gas cylinders, including surface cleaning, residue removal, and edge trimming, to ensure that the product's appearance quality and dimensional accuracy meet requirements. Perform quality inspections, including but not limited to airtightness testing, water pressure strength testing, mechanical properties testing, and non-destructive testing. Comprehensively evaluate gas cylinders to ensure their performance meets design and operating requirements, particularly ensuring safety and reliability under high-pressure conditions.

[0071] A medium-low pressure V-shaped bottle was produced using the manufacturing process of the V-shaped bottle in Example 1. The rated working pressure of the V-shaped bottle was 10 MPa, the outer diameter of the product was 150 mm, and the length was 300 mm.

[0072] Example 2

[0073] Based on Example 1, to accelerate the hydrolysis of the inner liner 1 in S07, the winding mandrel 2 is provided with at least one inlet channel and at least one outlet channel. The inlet channel and the outlet channel are respectively connected to the cavity 1-1. The inlet channel is connected to the pressure end of the hot water delivery system for delivering hot water to the cavity 1-1. The outlet channel is connected to the wastewater collection end for recovering the hydrolysis product.

[0074] Example 3

[0075] In Example 1, the water-soluble material is typically polyvinyl alcohol (PVA) or polyethylene glycol (PEG). PVA is one of the most commonly used and established water-soluble polymers, offering excellent film-forming properties, mechanical strength, and adjustable water solubility (by adjusting the degree of hydrolysis and molecular weight). For V-shaped bottle liners, a high degree of hydrolysis (e.g., 98-99%) can be selected to enhance water resistance. However, its dissolution rate can be accelerated by increasing the water temperature (e.g., 60-80°C hot water). The dissolved product is non-toxic and environmentally friendly. PEG is also a water-soluble polyether with excellent lubricity and a low melting point. For liners, higher molecular weight PEG (e.g., PEG 6000, 8000, 10000) can be used in solid form to provide sufficient rigidity and shape retention. PEG dissolves quickly, and the solution has a low viscosity, making it easy to drain from the bottle. However, its disadvantage is that it is generally weaker than PVA.

[0076] Based on Example 1, Example 3 utilizes a water-soluble material comprising a mixture of water-soluble sand and a soluble adhesive. In one embodiment, the inner liner is formed by mixing water-soluble sand and a water-soluble adhesive. Pure quartz sand can be used as the water-soluble sand, preferably with a particle size of 50 to 200 mesh. Water glass (sodium silicate solution) can be used as the water-soluble adhesive, preferably with a modulus of 2.0 to 3.3. The weight ratio of quartz sand to water glass is preferably within the range of 6.5:3.5 to 7.5:2.5. This ratio allows the quartz sand to be fully encapsulated and bonded by the water glass adhesive, resulting in a wet material with good plasticity (suitable for centrifugal / pressurized molding) and sufficient strength to withstand winding tension after drying. During dissolution, the water glass adhesive dissolves first, loosening the sand particles and carrying them away with the water. Excessive quartz sand content may result in insufficient strength and brittleness; excessive water glass adhesive content may lead to significant drying shrinkage, cracking, and slow dissolution. In one embodiment, a weight ratio of 7:3 is used. This ratio ensures good moldability of the mixture, ensuring that the inner liner has the necessary strength to withstand subsequent winding processes after drying. When dissolved in hot water, the adhesive quickly dissolves, loosening the sand particles for easy drainage. If the water-soluble material is a mixture of water-soluble sand and soluble glue, uneven bumps or pits may easily appear on the surface of the inner liner 1. Therefore, a silicone coating is applied to the inner liner 1 to cover these bumps and pits, preventing defects in the carbon fiber layer 3 after molding.

[0077] In another embodiment, the water-soluble sand comprises lightweight ceramic microbeads with a particle size range of 80 to 200 mesh; the soluble adhesive comprises an aqueous solution of polyvinyl alcohol (PVA). The weight ratio of the ceramic microbeads to the aqueous solution of polyvinyl alcohol (PVA) is preferably between 6:4 and 8:2. By adjusting the concentration and viscosity of the adhesive solution, the processability of the mixture and the strength and solubility of the molded liner can be optimized.

[0078] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0079] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A V-shaped gas storage cylinder, wherein the cylinder body (8) is composed of a carbon fiber layer (3), characterized in that: One end of the bottle body (8) is in the shape of a head; the other end of the bottle body (8) has a valve seat of a composite structure, and the valve seat of the composite structure comprises: a reinforcing layer (4) formed of a carbon fiber material; An inner valve seat (5) is bonded and fixed to the outside of the reinforcing layer (4), and the carbon fiber layer (3) wraps the inner valve seat (5) inside thereof, so that the inner valve seat (5) is sandwiched between the carbon fiber layer (3) and the reinforcing layer (4); An outer valve seat (7) mounted on the inner valve seat (5); Sealing ring (6) for valve seat sealing.

2. The V-shaped gas cylinder according to claim 1, characterized in that: The reinforcing layer (4) is bonded to the inner cavity of the other end of the bottle body (8); the inner surface of the reinforcing layer (4) comprises a reinforcing layer semi-sealed section (4-1) and a reinforcing layer curved surface section (4-2); the inner cylindrical surface of the inner cavity of the bottle body (8) is smoothly connected to the reinforcing layer semi-sealed section (4-1); and the reinforcing layer semi-sealed section (4-1) and the reinforcing layer curved surface section (4-2) on the reinforcing layer (4) are connected.

3. The V-shaped gas cylinder according to claim 2, characterized in that: The inner surface of the reinforcing layer (4) is formed by the inner liner (1) of the cavity of the molded bottle body (8).

4. The V-shaped gas cylinder according to claim 1, characterized in that: The reinforcing layer (4) is provided with a sealing surface (5-1) matching the sealing ring (6); the sealing surface (5-1) and the pipe thread interface (5-2) on the inner valve seat (5) are formed in one process; the pipe thread interface (5-2) is used to connect to the outer valve seat (7).

5. The V-shaped gas cylinder according to claim 1, characterized in that: The sealing ring (6) is a conical sealing ring.

6. The V-shaped gas cylinder according to claim 1, characterized in that: The reinforcing layer (4) and the inner valve seat (5) are pre-installed on the inner liner (1) in the cavity of the molded bottle body (8), and the inner valve seat (5) is wrapped inside the carbon fiber layer (3) through a winding process.

7. A process for producing the V-shaped gas cylinder according to any one of claims 1 to 6, characterized in that: The steps include: An inner liner (1) for winding a V-shaped bottle is produced, wherein a winding core rod (2) is pre-embedded in the inner liner (1); Applying glue on the surface of the formed inner liner (1) and curing it; Adhere a reinforcing layer (4) to the other end of the inner liner (1); An inner valve seat (5) made of metal is bonded to the outside of the reinforcement layer (4); A carbon fiber layer (3) is wound around the outside of the inner liner (1), and during the winding process, the outer side of the inner valve seat (5) is wrapped inside the carbon fiber layer (3), so that the inner valve seat (5) is arranged between the carbon fiber layer (3) and the reinforcement layer (4); The wound V-shaped bottle is solidified as a whole; After the curing is completed, the inner liner (1) is dissolved and the winding core rod (2) is removed to form a V-shaped bottle shell with an inner valve seat; A sealing surface (5-1) and a pipe thread interface (5-2) are formed at the air inlet of the V-shaped bottle shell with an inner valve seat at one time; An outer valve seat (7) and a sealing ring (6) are installed at the air inlet of the V-shaped bottle shell with an inner valve seat.

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