Manufacturing process of V-shaped bottle and V-shaped gas storage bottle

Abstract

The invention provides a manufacturing process of a V-shaped bottle and a V-shaped gas body.The manufacturing process comprises the following steps that an inner container for winding the V-shaped bottle is manufactured, and a winding core rod is pre-buried in the inner container; coating glue on the surface of the molded inner container and curing; a reinforcing layer is adhered to the other end of the inner container; an inner valve seat made of a metal material is adhered to the outer side of the reinforcing layer; a carbon fiber layer is wound outside the inner container, and the outer side of the inner valve seat is wrapped in the carbon fiber layer in the winding process, so that the inner valve seat is arranged between the carbon fiber layer and the reinforcing layer; the whole wound V-shaped bottle is subjected to curing treatment; after curing is completed, the inner container is dissolved, the winding core rod is taken out, and the V-shaped bottle shell with the inner valve seat is formed; a sealing face and a pipe thread connector are formed at an air inlet of a V-shaped bottle shell with an inner valve seat in a one-time machining mode. And an outer valve seat and a sealing ring are arranged at an air inlet of the V-shaped bottle shell with the inner valve seat. The problem of sealing failure of a valve seat area can be solved, and the sealing reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure gas storage container manufacturing, and in particular to a manufacturing process of a V-shaped bottle and a V-shaped gas storage bottle. 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, the manufacturing process of V-shaped bottles, especially in integrating high-performance and high-reliability metal valve seats on the bottle body, faces many technical challenges and bottlenecks, which restrict its large-scale application and further improvement of performance. The existing technology mainly has the following key problems:

[0004] 1. The core of V-shaped bottle manufacturing lies in the need for a removable core mold to form the bottle's inner cavity. While traditional metal core molds offer high strength and dimensionally stable properties, they are difficult to remove without damage after winding and curing. Forced demolding can easily damage the fragile carbon fiber reinforced structure, leading to high product scrap rates. Alternative solutions have attempted to use low-melting-point alloy core molds or salt molds, but these suffer from issues such as high melting temperatures (which may damage the resin matrix), difficulty in completely removing residue after demolding, or insufficient core mold strength to withstand winding tension. Water-soluble core molds (such as PVA) are considered a potential solution due to their dissolvability. However, their application to V-shaped bottles, particularly those with complex valve seats, still faces challenges such as low dissolution efficiency (especially for thick-walled or complex-shaped core molds), difficulty in designing dissolution channels, and challenges in maintaining core strength and dimensional stability during the winding process. Existing technologies lack an efficient, reliable, and non-destructive demolding method that can perfectly shape the inner cavity of complex V-shaped bottles and completely remove the core mold while ensuring stable core molding and winding processes.

[0005] 2. A reliable connection and seal between the metal valve seat and the composite body are vital to the safe operation of high-pressure gas storage cylinders. A common existing practice is to assemble the metal valve seat to the bottle neck either before or after winding. However, both methods have significant drawbacks: a. Assembly after winding: This requires machining mounting holes and sealing surfaces in the composite body, disrupting fiber continuity and severely weakening the pressure-bearing capacity in this area, creating a potential failure point. Assembly precision and sealing reliability are also difficult to guarantee. b. Pre-embedding / bonding before winding: While this ensures fiber continuity around the valve seat and improves local strength, it introduces a more challenging issue: the significant difference in the coefficient of thermal expansion (CTE) between the metal valve seat and the carbon fiber composite (the CTE of metal is typically 5-10 times greater than that of carbon fiber). During the subsequent high-temperature curing and cooling of the resin matrix, significant shrinkage stresses are generated between the metal and composite materials. This stress can easily lead to microcracks or even macroscopic delamination at the bonding interface, severely compromising sealing performance. This risk is particularly pronounced in the bottle neck seal area, due to its complex structure and concentrated stresses. Existing technologies try to alleviate this problem by increasing the number of local winding layers, using special adhesives or flexible transition layers, but the effect is limited and often cannot fundamentally solve the problems of delamination and sealing failure caused by thermal shrinkage mismatch, which has become a major hidden danger affecting the long-term safety and reliability of V-shaped bottles.

[0006] 3. The machining accuracy of the valve seat sealing interface is insufficient. Even if the valve seat is successfully pre-embedded and encapsulated, the machining accuracy of the sealing interface (such as the tapered sealing surface and pipe threads) that ultimately connects to the external valve is crucial. Existing processes typically require step-by-step processing: first, the sealing surface is machined on the composite bottle body, and then the pipe threads are machined on the metal valve seat. Multiple clamping and positioning inevitably introduce cumulative errors, resulting in the sealing surface being misaligned with the center axis of the pipe thread. When the external valve seat is installed and tightened, this misalignment causes uneven force on the tapered sealing ring, resulting in localized over-extrusion and insufficient sealing in other areas, which can easily lead to leakage. The sealing problems caused by this machining error are difficult to fully compensate for through adjustments later. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides a manufacturing process for a V-shaped bottle and a V-shaped gas storage bottle, which solve the problem of sealing failure in the valve seat area and improve the sealing reliability.

[0008] The present invention achieves the above technical objectives through the following technical means.

[0009] A manufacturing process for a V-shaped bottle comprises the following steps:

[0010] Making an inner liner for winding a V-shaped bottle, wherein a winding core rod is pre-embedded in the inner liner;

[0011] Apply glue on the surface of the formed inner liner and cure it;

[0012] Bonding a reinforcement layer to the other end of the liner;

[0013] An inner valve seat made of metal is bonded to the outside of the reinforcement layer;

[0014] 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;

[0015] The wound V-shaped bottle is solidified as a whole;

[0016] 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;

[0017] 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;

[0018] 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.

[0019] Furthermore, the inner liner is made of water-soluble material, and a cavity for weight reduction is provided in the center of the inner liner. A winding core rod is pre-embedded in the inner liner, and one end of the pre-embedded winding core rod extends out of one side of the inner liner, and the other end of the pre-embedded winding core rod can contact or be inserted into the cavity; a channel connecting the cavity is provided in the pre-embedded winding core rod.

[0020] Furthermore, one end of the inner liner is in a head shape, and the cross-section of the other end of the inner liner includes a semi-head section and a curved surface section. The semi-head section is in a partial head shape, and the outer cylindrical surface of the inner liner is smoothly connected to the semi-head section, and the semi-head section is connected to the curved surface section; a reinforcement layer is bonded to the curved surface section, and the reinforcement layer covers the curved surface section and extends to the semi-head section, so that the semi-head section and the reinforcement layer covering it together constitute the head shape of the other end of the inner liner.

[0021] Furthermore, the material of the reinforcement layer is carbon fiber material.

[0022] Furthermore, after the curing is completed, hot water is added to the cavity through the channel of the winding core rod to dissolve the water-soluble liner, discharge the dissolved matter, and remove the pre-embedded winding core rod to form a V-shaped bottle shell with an inner valve seat.

[0023] Furthermore, at least one inlet channel and at least one outlet channel are provided inside the winding mandrel, and the inlet channel and the outlet channel are respectively connected to the cavity, the inlet channel is connected to the pressure end of the hot water delivery system, and the outlet channel is connected to the wastewater collection end.

[0024] Furthermore, a sealing surface and a pipe thread interface are formed at the air inlet of the V-shaped bottle shell with an inner valve seat at one time, the sealing surface is processed on the end surface formed by the reinforcement layer, and the pipe thread interface is processed on the inner valve seat; a conical sealing ring is placed on the sealing surface, and the outer valve seat is installed on the inner valve seat through the pipe thread interface, and the outer valve seat is tightened to squeeze the conical sealing ring so that the sealing ring is sealed between the outer valve seat and the inner valve seat.

[0025] Furthermore, the water-soluble material is made by mixing water-soluble sand and a water-soluble adhesive; the particle size of the water-soluble sand ranges from 50 mesh to 200 mesh.

[0026] Furthermore, the weight mixing ratio of the water-soluble sand to the water-soluble adhesive is 6.5:3.5 to 7.5:2.5.

[0027] A V-shaped gas storage cylinder is manufactured using the manufacturing process of the V-shaped cylinder.

[0028] The beneficial effects of the present invention are:

[0029] 1. The manufacturing process for the V-shaped bottle described in this invention addresses the issue of seal failure in the valve seat area and improves sealing reliability. One end of the inner liner is designed to comprise a semi-end segment and a curved section. A carbon fiber reinforcement layer is bonded to the curved section, extending over the semi-end segment to form a complete end segment. The metal inner valve seat is bonded to the outer side of the reinforcement layer. The carbon fiber layer is wrapped around the inner valve seat, completely enveloping it and positioning it between the carbon fiber layer and the reinforcement layer. This design avoids direct, large-scale bonding of the metal valve seat to a single carbon fiber layer (or inner liner). Because the carbon fiber layer and the reinforcement layer have the same thermal expansion coefficient, their shrinkage rates are consistent during the subsequent high-temperature curing and cooling processes, effectively eliminating the risk of interfacial stress concentration and delamination caused by differential thermal expansion between the metal and composite materials. Furthermore, the reinforcement layer acts as an intermediate layer, isolating the metal valve seat from potential sealing issues directly caused by differential thermal expansion, significantly improving the long-term sealing reliability and service life of the valve seat area under high-pressure environments.

[0030] 2. The manufacturing process for the V-shaped flask described in this invention utilizes 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 cap at the other end, creates a flat or regularly transitioned bonding reference surface (curved section). This allows the carbon fiber reinforcement layer to be securely 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.

[0031] 3. The V-shaped bottle manufacturing process described in this invention forms the sealing surface and pipe thread interface in a single clamping process at the end portion, which is formed by the inner valve seat and reinforcement layer. This ensures extremely high concentricity between the sealing surface (located on the carbon fiber reinforcement layer) and the pipe thread interface (located on the metal inner valve seat). This avoids the cumulative errors caused by secondary clamping processes and ensures that the tapered sealing ring is evenly and coaxially compressed by the outer valve seat against the sealing surface. This significantly improves the static and dynamic sealing performance of the final valve seat interface and reduces the risk of leakage.

[0032] 4. The manufacturing process for the V-shaped bottle described in this invention utilizes a water-soluble material to create the inner liner; a pre-embedded winding mandrel with a channel is placed in the center of the inner liner; and hot water is injected through the mandrel channel to dissolve the inner liner. The design of the water-soluble inner liner and the pre-embedded mandrel channel allows the inner liner to be completely dissolved and discharged by injecting hot water after curing, achieving non-destructive demolding. This method is simple and efficient, avoiding potential damage to the internal carbon fiber structure caused by mechanical demolding, ensuring the integrity and smoothness of the product cavity, and simultaneously improving production efficiency and product yield.

[0033] 5. The V-shaped flask's manufacturing process utilizes a carbon fiber layer winding process and incorporates a carbon fiber reinforcement layer, ensuring a uniform and dense carbon fiber layer and fully utilizing the high strength of carbon fiber. Combined with the valve seat structure and reinforcement layer, the V-shaped flask's overall structural strength and rigidity are significantly enhanced, enabling it to withstand higher internal pressures and meet the demands of high-pressure gas storage applications.

[0034] 6. The V-shaped bottle manufacturing process described in this invention features a pre-embedded core rod design that integrates support, rotational drive, and dissolution channel functions. The valve seat is positioned and bonded before winding. Key sealing surfaces are machined and formed in a single process, streamlining the process and improving production controllability. The valve seat is precisely positioned, bonded, and wrapped before winding, eliminating errors in subsequent assembly. This single-process machining of key sealing surfaces ensures precision. These designs make the entire manufacturing process more streamlined, smooth, and controllable, ensuring consistent and stable product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 The figure is a flow chart of the manufacturing process of the V-shaped bottle of the present invention.

[0037] Figure 2 This is a structural diagram of the inner liner described in the present invention.

[0038] Figure 3 This is a schematic diagram of the reinforcement layer installed outside the inner liner according to the present invention.

[0039] Figure 4 This is a schematic diagram of the installation of the inner valve seat according to the present invention.

[0040] Figure 5 This is a schematic diagram of the inner liner of the present invention after being wrapped with a carbon fiber layer.

[0041] Figure 6 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.

[0042] Figure 7 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.

[0043] Figure 8 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.

[0044] Figure 9 Schematic diagram of the winding mandrel in Example 2 of the present invention.

[0045] In the picture:

[0046] 1-Inner liner; 1-1-Cavity; 1-2-Semi-end section; 1-3-Curved section; 2-Wound mandrel; 2-1-Inlet channel; 2-2-Outlet channel; 3-Carbon fiber layer; 4-Reinforcement layer; 5-Inner valve seat; 5-1-Sealing surface; 5-2-Pipe thread interface; 6-Sealing ring; 7-Outer valve seat; DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] Example 1 Figure 1 As shown, the manufacturing process of the V-shaped bottle of the present invention includes the following steps:

[0051] S01: Make the inner liner for wrapping V-shaped bottles, specifically:

[0052] 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 2 shown.

[0053] 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 2As 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.

[0054] 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.

[0055] S03: If Figure 3 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 3 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.

[0056] 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 4 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.

[0057] S05: If Figure 5 As 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.

[0058] 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.

[0059] S06: Curing treatment: The wrapped V-shaped bottle is placed in a curing oven for curing treatment.

[0060] 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 6 shown.

[0061] 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 7 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.

[0062] 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 8 shown.

[0063] 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 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.

[0064] 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.

[0065] Example 2

[0066] On the basis of Example 1, in order to accelerate the hydrolysis rate of the inner liner 1 in S07, as Figure 9 As shown, the winding mandrel 2 is internally provided with at least one inlet channel 2-1 and at least one outlet channel 2-2. The inlet channel 2-1 and the outlet channel 2-2 are respectively connected to the cavity 1-1. The inlet channel 2-1 is connected to the pressure end of the hot water delivery system for delivering hot water to the cavity 1-1. The outlet channel 2-2 is connected to the wastewater collection end for recovering the hydrolysis product.

[0067] Example 3

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 manufacturing process for a V-shaped bottle, 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.

2. The manufacturing process of the V-shaped bottle according to claim 1, characterized in that: The inner liner (1) is made of a water-soluble material, and a cavity (1-1) for reducing weight is provided in the center of the inner liner (1). A winding core rod (2) is pre-embedded in the inner liner (1), and one end of the pre-embedded winding core rod (2) extends out of one side of the inner liner (1), and the other end of the pre-embedded winding core rod (2) can contact or be inserted into the cavity (1-1); a channel communicating with the cavity (1-1) is provided in the pre-embedded winding core rod (2).

3. The manufacturing process of the V-shaped bottle according to claim 1, characterized in that: One end of the inner liner (1) is in the shape of a head, and 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), wherein the semi-head section (1-2) is in the shape of a partial head, and the outer cylindrical surface of the inner liner (1) is smoothly connected to the semi-head section (1-2), and the semi-head section (1-2) is connected to the curved surface section (1-3); a reinforcing layer (4) is bonded to the curved surface section (1-3), and the reinforcing layer (4) covers the curved surface section (1-3) and extends to the semi-head section (1-2), so that the semi-head section (1-2) and the reinforcing layer (4) covering it together constitute the head shape of the other end of the inner liner (1).

4. The manufacturing process of the V-shaped bottle according to claim 1, characterized in that: The material of the reinforcement layer (4) is carbon fiber material.

5. The manufacturing process of the V-shaped bottle according to claim 1, characterized in that: After the curing is completed, hot water is added to the cavity (1-1) through the channel of the winding core rod (2) to dissolve the water-soluble liner (1), the dissolved matter is discharged, and the pre-buried winding core rod (2) is removed to form a V-shaped bottle shell with an inner valve seat.

6. The manufacturing process of the V-shaped bottle according to claim 5, characterized in that: At least one inlet channel (2-1) and at least one outlet channel (2-2) are provided inside the winding mandrel (2); the inlet channel (2-1) and the outlet channel (2-2) are respectively communicated with the cavity (1-1); the inlet channel is connected to the pressure end of the hot water delivery system, and the outlet channel (2-2) is communicated with the wastewater collection end.

7. The manufacturing process of the V-shaped bottle according to claim 1, characterized in that: 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, wherein 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); a conical sealing ring (6) is placed on the sealing surface (5-1), and an outer valve seat (7) is installed on the inner valve seat (5) through the pipe thread interface (5-2); the outer valve seat (7) is tightened to squeeze the conical sealing ring (6), so that the sealing ring (6) is sealed between the outer valve seat (7) and the inner valve seat (5).

8. The manufacturing process of the V-shaped bottle according to claim 2, characterized in that: The water-soluble material is prepared by mixing water-soluble sand and a water-soluble adhesive; the particle size of the water-soluble sand ranges from 50 meshes to 200 meshes.

9. The manufacturing process of the V-shaped bottle according to claim 2, characterized in that: The weight mixing ratio of the water-soluble sand to the water-soluble adhesive is 6.5:3.5 to 7.5:2.

5.

10. A V-shaped gas storage cylinder, characterized in that: A V-shaped gas storage cylinder manufactured using the manufacturing process of the V-shaped bottle according to any one of claims 1 to 9.

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