V-shaped hydrogen storage ring and preparation process thereof

Abstract

The invention discloses a V-shaped hydrogen storage ring and a preparation process thereof. The preparation process comprises the following steps: preparing two semi-ring-shaped supporting devices by adopting a low-melting-point alloy; the two semi-annular supporting devices are arranged in an annular mold, the rest space of the annular mold is filled with water-soluble sand, and after solidification, an upper core mold and a lower core mold are obtained; respectively sleeving the upper core mold and the lower core mold with diaphragms, and assembling to obtain a core mold; the core mold is placed on a winding machine to prepare a winding enhancement layer, a valve seat is pre-buried, and after winding is completed, the valve seat is sleeved with a curved surface clamping block and locked through a locking nut; the wound hydrogen storage ring is vacuumized, bubbles in a winding layer are removed, then the hydrogen storage ring is heated and solidified in an inert atmosphere, meanwhile, the core mold is heated, melted and discharged, and finally the diaphragm is taken out; injecting reinforced resin into the cured hydrogen storage ring, heating for melting, and shaking uniformly, so that the reinforced resin is uniformly distributed on the inner wall of the hydrogen storage ring; and a glass fiber reinforced resin layer is wound on the outer side of the hydrogen storage ring.

Description

Technical Field

[0001] The invention belongs to the technical field of V-shaped hydrogen storage pressure vessels, and specifically relates to a V-shaped hydrogen storage ring and a preparation process thereof. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The development of pressure vessels for storing liquids and gases under high pressure has gone through five different stages: all-metal tanks (Type I), composite wrapped metal tanks (Type II), carbon fiber reinforced plastic (CFRP) wrapped metal liner tanks (Type III), carbon fiber reinforced plastic (CFRP) wrapped plastic liner tanks (Type IV) and all-composite linerless tanks (Type V). Among them, all-composite linerless tanks (Type V) refer to pressure vessels that do not contain any liner and are made entirely of composite materials.

[0004] The inner liner of existing pressure vessels is made of metal or polymer materials, so the manufacturing cost of the inner liner is high, and it is easy to fail during use. For example, the inner liner of Type III gas cylinder is made of aluminum alloy, which has high processing cost and is prone to hydrogen embrittlement. The inner liner of Type IV gas cylinder is made of nylon PA6 or high-density polyethylene, which has high processing cost. During use, bubbles are easy to appear in the inner liner and the winding layer, resulting in collapse and other damage.

[0005] The V-type pressure vessel has no liner, which can effectively reduce the processing cost and better solve the problem of easy failure of the liner. However, the existing V-type pressure vessels are mostly in the shape of bottles. The valve control system of the bottle-type pressure vessel is exposed and unprotected, and is easily damaged during transportation. In addition, the side wall of the pressure vessel is composed of fiber and adhesive, and many bubbles are easily generated at the inlet of the pressure vessel, which makes the seal between the valve seat and the side wall loose, resulting in gas or liquid leakage.

[0006] In addition, the core mold used in the preparation process of the V-type pressure vessel has low strength. For example, the sand mold is easily damaged during the fiber winding process, and in the later stage of pressure vessel production, the sand mold is difficult to dissolve and clean. When cleaning the core mold, if the core mold is not cleaned thoroughly, the core mold material remaining in the container will easily block the valve and cause accidents. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention aims to provide a V-shaped hydrogen storage ring and a preparation process thereof.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] In a first aspect, the present invention provides a V-shaped hydrogen storage ring, which is an annular hydrogen storage structure, wherein a sealing layer, a winding reinforcement layer and a protective layer are sequentially arranged on the cross section from the inside to the outside, and a valve control system is arranged on the inner side of the annular hydrogen storage structure;

[0010] The winding reinforcement layer is made of fiber-reinforced resin composite material;

[0011] The valve control system includes a valve seat, a curved clamp and a locking nut. The base of the valve seat is embedded in the inner side of the fiber reinforced layer and extends outward to form an inlet and outlet channel. The contact surface between the base of the valve seat and the fiber reinforced layer is a curved surface adapted to the inner wall of the fiber reinforced layer.

[0012] The curved clamp is sleeved on the valve seat and is located outside the fiber reinforced layer. The surface of the curved clamp in contact with the fiber reinforced layer is an arc surface. The locking nut cooperates with the thread on the valve seat surface to clamp the curved clamp to the fiber reinforced layer.

[0013] Placing the valve control system on the inner side of the annular hydrogen storage structure can provide good protection for the valve control system, effectively preventing damage to the valve control system during transportation and use, thereby ensuring good sealing performance of the valve control system.

[0014] The structure of the valve control system is improved, the locking nut clamps the valve seat and the curved clamp clamps the fiber reinforced layer to seal, which effectively improves the strength and sealing performance of the fiber reinforced layer at the valve seat.

[0015] In some embodiments, the ratio of the maximum outer diameter of the valve seat to the minimum outer diameter of the valve seat is 2-4:1;

[0016] The ratio of the maximum outer diameter to the minimum inner diameter of the curved clamp is 2-4:1.

[0017] The minimum outer diameter of the valve seat and the minimum inner diameter of the curved clamp block correspond to the opening diameter of the fiber-reinforced layer at the valve seat; the maximum outer diameter of the valve seat and the maximum outer diameter of the curved clamp block correspond to the diameter of the clamping area of ​​the fiber-reinforced layer. The clamping surface of the valve seat and the curved clamp block is set to be larger to ensure the clamping effect of the fiber-reinforced layer and enhance the strength and sealing performance of the valve seat.

[0018] In some embodiments, the sealing layer is a reinforced resin layer, and the reinforced resin layer is used to uniformly seal the inner wall of the hydrogen storage ring.

[0019] Preferably, the reinforcing resin is high-density polyethylene.

[0020] In some embodiments, the protective layer is a glass fiber reinforced resin layer. The protective layer is prepared using glass fiber reinforced resin, so that the hydrogen storage ring has better durability, good thermal stability and good UV resistance in a humid or corrosive environment.

[0021] In a second aspect, the present invention provides a method for preparing a V-shaped hydrogen storage ring, comprising the following steps: preparing two semi-annular support devices using a low melting point alloy;

[0022] The two semi-annular support devices are respectively placed in the annular mold, and the remaining space of the annular mold is filled with quartz sand and a water-soluble adhesive. After solidification, an upper core mold and a lower core mold are respectively obtained, and interfaces are provided at the cross sections of the upper core mold and the lower core mold;

[0023] After the upper core mold and the lower core mold are covered with diaphragms respectively, they are butted and assembled to obtain the core mold, wherein the diaphragm is a diaphragm with sealed ends;

[0024] Place the core mold on the winding machine to prepare the winding reinforcement layer, embed the valve seat in advance, and after the winding is completed, put the curved clamp block on the valve seat to clamp it, and then use the locking nut to lock it;

[0025] The wound hydrogen storage ring is evacuated to remove bubbles in the winding layer, and then heated and solidified in an inert gas environment. At the same time, the low-melting-point support device is heated and melted and discharged. Then water is added to the support device to dissolve and discharge the core mold, and finally the diaphragm is taken out;

[0026] Inject reinforcing resin into the solidified hydrogen storage ring, heat and melt, and shake well to make the reinforcing resin evenly distributed on the inner wall of the hydrogen storage ring;

[0027] A glass fiber reinforced resin layer is wound around the outer side of the hydrogen storage ring.

[0028] A certain amount of inert gas is filled into the curing furnace to prevent the hydrogen storage ring material from undergoing an oxidation reaction with oxygen. The use of inert gas can also help maintain the uniformity of the temperature in the furnace, thereby ensuring that the hydrogen storage ring is evenly heat treated throughout the curing process.

[0029] A certain amount of gas sealing reinforcing resin is injected into the solidified hydrogen storage ring, heated, melted and shaken to make the reinforcing resin evenly distributed on the inner wall of the hydrogen storage ring, thereby playing a role in gas sealing enhancement.

[0030] A semi-annular support device is prepared using a low-melting-point alloy, and then a water-soluble sand core mold is prepared together with quartz sand and a water-soluble adhesive. This can effectively improve the mechanical properties of the core mold and prevent deformation during transfer and winding.

[0031] When removing the core mold, first use a liquid pump to remove the alloy in the molten state, then pass water to dissolve the water-soluble sand core, and take it out with a liquid pump. When there is a little residual water-soluble sand in the cavity (the diaphragm is like a deflated balloon at this time), directly take out the diaphragm. Since the end of the diaphragm is sealed, a container can be formed. When the diaphragm is taken out, the water-soluble sand core remaining in the diaphragm can be completely taken out.

[0032] In some embodiments, a valve seat supporting mold is disposed on both the upper core mold and the lower core mold, and the outer diameter of the valve seat supporting mold is equal to the inner diameter of the valve seat.

[0033] Preferably, the diaphragm is also fitted onto the valve seat supporting mold.

[0034] After the core mold is heated and melted, the diaphragm is punctured through the valve seat, and the melted core mold can flow out through the rupture of the diaphragm. When most of the core mold flows out, the diaphragm can be pulled out through the valve seat opening, and the remaining core mold is discharged at the same time. This method can effectively avoid the residue of the core mold and thus avoid clogging the valve seat.

[0035] In some embodiments, the low melting point alloy is a bismuth-based alloy.

[0036] In some embodiments, the water-soluble adhesive is polyvinyl alcohol.

[0037] In some embodiments, the interface is a groove and a protrusion that cooperates therewith.

[0038] In some embodiments, the diaphragm is made of polypropylene, which has high strength and is not easy to tear.

[0039] The beneficial effects achieved by one or more embodiments of the present invention are as follows:

[0040] The semi-annular supporting device of the present invention can be used as the skeleton of the hydrogen storage ring core mold, so that the strength of the core mold is greatly enhanced during the processes of fiber winding and transportation, thereby avoiding deformation and damage.

[0041] The core mold is split into upper and lower parts, which not only solves the problem that the diaphragm is not easy to remove, but also greatly reduces the production cost. The mold used for casting becomes smaller, easier to process and easier to carry.

[0042] The hydrogen storage ring wrapped with carbon fiber was covered with a vacuum bag and evacuated to remove bubbles between carbon fiber layers and increase strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0044] Figure 1 is a cross-sectional view of a V-shaped hydrogen storage ring according to an embodiment of the present invention;

[0045] Figure 2 Schematic diagram of the structure of the valve seat (embedded part) of an embodiment of the present invention;

[0046] Figure 3 is a schematic structural diagram of a supporting device according to an embodiment of the present invention;

[0047] Figure 4 Schematic diagram of the structure of the core mold (low melting point alloy + water-soluble sand core) according to an embodiment of the present invention;

[0048] Figure 5 It is a structural schematic diagram of the core mold of an embodiment of the present invention.

[0049] In the figure, 1-locking nut; 2-curved clamping block; 3-sealing cover; 4-film; 5-valve seat; 6-water-soluble sand; 7-low melting point alloy; 8-winding reinforcement layer; 9-protective layer; 10-diaphragm. DETAILED DESCRIPTION

[0050] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0051] The present invention will be further described below in conjunction with the embodiments.

[0052] Example

[0053] like Figure 1 As shown, a V-shaped hydrogen storage ring is an annular hydrogen storage structure, and a sealing layer, a winding reinforcement layer and a protective layer are sequentially arranged on its cross section from the inside to the outside, and a valve control system is arranged on the inner side of the annular hydrogen storage structure;

[0054] The winding reinforcement layer is made of fiber-reinforced resin composite material;

[0055] like Figure 2 As shown, the valve control system includes a valve seat, a curved clamp and a locking nut. The base of the valve seat is embedded in the inner side of the fiber reinforced layer and extends outward to form an inlet and outlet channel. The contact surface between the base of the valve seat and the fiber reinforced layer is a curved surface adapted to the inner wall of the fiber reinforced layer.

[0056] The curved clamp is sleeved on the valve seat and is located outside the fiber reinforced layer. The surface of the curved clamp in contact with the fiber reinforced layer is an arc surface. The locking nut cooperates with the thread on the valve seat surface to clamp the curved clamp to the fiber reinforced layer.

[0057] The winding reinforcement layer is mainly composed of fiber and resin, which plays a mechanical protection role and resists the expansion of high-pressure gas. When the annular container is wound, the thickness of the inner ring of the winding layer is greater than the winding thickness of other parts, and the stress of the inner ring is subject to compressive stress, so the valve seat is arranged on the inner side of the ring. The winding fiber has a pressing force on the valve seat, which makes the structure at this location have excellent mechanical properties and good air tightness.

[0058] The protective layer is mainly composed of glass fiber and resin, which makes the hydrogen storage bottle more durable in humid or corrosive environments, and has good thermal stability and UV resistance. Depending on the actual application, the material can be other materials.

[0059] The outer surface of the valve seat is arc-shaped and flush with the outer surface of the sand mold. When the carbon fiber is wound, it is not easy to have protrusions there, making the area smooth.

[0060] The upper surface of the curved clamp is a plane, which is combined with the locking nut to facilitate the locking of the locking nut. The lower surface is set to be concave, and its concave surface corresponds to the outer surface of the valve seat. The carbon fiber is located between the valve seat and the curved clamp. The carbon fiber is clamped at this location, making the structure tight and the mechanical properties better.

[0061] The locking nut is used to prevent the curved clamp from sliding and to keep the curved clamp and the valve seat in a clamped state at all times.

[0062] The ratio of the maximum outer diameter of the valve seat to the minimum outer diameter of the valve seat is 2-4:1; the ratio of the maximum outer diameter of the curved clamp to the minimum inner diameter is 2-4:1.

[0063] The sealing layer is a reinforced resin layer, which is used to evenly seal the inner wall of the hydrogen storage ring. The reinforced resin is high-density polyethylene. The protective layer is a glass fiber reinforced resin layer, which is prepared by using glass fiber reinforced resin, so that the hydrogen storage ring has better durability, good thermal stability and good UV resistance in a humid or corrosive environment.

[0064] The preparation process of the V-type hydrogen storage ring is as follows:

[0065] Make a low melting point alloy semi-annular support device (such as Figure 3 As shown), a casting mold comprising an upper annular sand mold and a lower annular sand mold.

[0066] First, a low melting point alloy support device is made, and the low melting point alloy is injected from the feed port of the casting mold until the cavity is filled, and then cooled to form a semi-annular support device. Figure 3 As shown, the low-melting-point alloy semi-annular support device is then placed into the casting molds of the upper annular sand mold and the lower annular sand mold, and quartz sand and water-soluble adhesive polyvinyl alcohol are poured in, and after solidification, the upper core mold and the lower core mold of the hydrogen storage ring are formed.

[0067] The upper core mold and the lower core mold are respectively covered with diaphragms, and then docked. The semicircular sections of the upper core mold and the lower core mold are provided with interfaces for docking. The function of the diaphragm is to remove the residual water-soluble sand and low-melting-point alloy at one time when the hydrogen storage ring container is completed, so that there is no residue in the cavity. If there is residue in the cavity, it will cause the valve body to be blocked.

[0068] Put the valve seat on the small port of the low melting point support device, and the entire hydrogen storage core replacement mold is assembled. Figure 5 shown.

[0069] The core mold is placed on the winding machine and carbon fiber is wound on it. After the winding is completed, a curved clamp is put on the valve seat to clamp the carbon fiber, and then it is locked by a locking nut;

[0070] The wound hydrogen storage ring is placed in a vacuum bag, connected to a vacuum pump, and evacuated to remove bubbles from the wound layer.

[0071] Inert gas is filled in the curing furnace to prevent the hydrogen storage ring material from oxidizing with oxygen, and the use of inert gas can help maintain the uniformity of the temperature in the furnace, thereby ensuring uniform heat treatment of the hydrogen storage ring throughout the curing process. The hydrogen storage ring is assembled in the curing furnace for curing. The temperature should be set according to the melting temperature of the core mold and the curing temperature of the winding layer. After the hydrogen storage ring winding layer is cured, the low melting point support device is melted and taken out by a pump, and then water is added to it to melt the water-soluble sand core, which is taken out by a pump, and finally the diaphragm is taken out.

[0072] A certain amount of gas sealing reinforcing resin is injected into the solidified hydrogen storage ring, heated, melted and shaken to make the reinforcing resin evenly distributed on the inner wall of the hydrogen storage ring to obtain a sealing layer with a thickness of 2-4 mm, which plays a role in enhancing gas sealing; the type of reinforcing resin is high-density polyethylene;

[0073] The surface of the hydrogen storage ring is treated and wrapped with a glass fiber reinforced resin layer to prevent the influence of the external environment, such as light, oil pollution, etc. The thickness of the glass fiber reinforced resin layer is 3 to 5 mm, and the resin type is epoxy resin.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A V-shaped hydrogen storage ring, characterized in that: It is an annular hydrogen storage structure, and its cross section is provided with a sealing layer, a winding reinforcement layer and a protective layer in sequence from the inside to the outside, and the valve control system is arranged on the inner side of the annular hydrogen storage structure; The winding reinforcement layer is made of fiber-reinforced resin composite material; The valve control system includes a valve seat, a curved clamp and a locking nut. The base of the valve seat is embedded in the inner side of the fiber reinforced layer and extends outward to form an inlet and outlet channel. The contact surface between the base of the valve seat and the fiber reinforced layer is a curved surface adapted to the inner wall of the fiber reinforced layer. The curved clamp is sleeved on the valve seat and is located outside the fiber reinforced layer. The surface of the curved clamp in contact with the fiber reinforced layer is an arc surface. The locking nut cooperates with the thread on the valve seat surface to clamp the curved clamp to the fiber reinforced layer.

2. The V-shaped hydrogen storage ring according to claim 1, characterized in that: The ratio of the maximum outer diameter of the valve seat to the minimum outer diameter of the valve seat is 2-4:1; The ratio of the maximum outer diameter to the minimum inner diameter of the curved clamp is 2-4:

1.

3. The V-shaped hydrogen storage ring according to claim 1, characterized in that: The sealing layer is a reinforced resin layer; Preferably, the reinforcing resin is high-density polyethylene.

4. The V-shaped hydrogen storage ring according to claim 1, characterized in that: The protective layer is a glass fiber reinforced resin layer.

5. A method for preparing a V-shaped hydrogen storage ring, characterized in that: The method comprises the following steps: preparing two semi-annular supporting devices by using a low melting point alloy; The two semi-annular support devices are respectively placed in the annular mold, and the remaining space of the annular mold is filled with quartz sand and a water-soluble adhesive. After solidification, an upper core mold and a lower core mold are respectively obtained, and interfaces are provided at the cross sections of the upper core mold and the lower core mold; After the diaphragms are respectively put on the upper core mold and the lower core mold, they are butted and assembled to obtain the core mold; Place the core mold on the winding machine to prepare the winding reinforcement layer, embed the valve seat in advance, and after the winding is completed, put the curved clamp block on the valve seat to clamp it, and then use the locking nut to lock it; The wound hydrogen storage ring is evacuated to remove bubbles in the winding layer, and then heated and solidified in an inert gas environment. At the same time, the low-melting-point support device is heated and melted and discharged. Then water is added to the support device to dissolve and discharge the core mold, and finally the diaphragm is taken out; Inject reinforcing resin into the solidified hydrogen storage ring, heat and melt, and shake well to make the reinforcing resin evenly distributed on the inner wall of the hydrogen storage ring; A glass fiber reinforced resin layer is wound around the outer side of the hydrogen storage ring.

6. The method for preparing a V-shaped hydrogen storage ring according to claim 5, characterized in that: A valve seat support mold is provided on both the upper core mold and the lower core mold, and the outer diameter of the valve seat support mold is equal to the inner diameter of the valve seat; Preferably, the diaphragm is also fitted onto the valve seat supporting mold.

7. The method for preparing a V-shaped hydrogen storage ring according to claim 5, characterized in that: The low melting point alloy is a bismuth-based alloy.

8. The method for preparing a V-shaped hydrogen storage ring according to claim 5, characterized in that: The water-soluble adhesive is polyvinyl alcohol.

9. The method for preparing a V-shaped hydrogen storage ring according to claim 5, characterized in that: The interface is a groove and a protrusion matched therewith.

10. The method for preparing a V-shaped hydrogen storage ring according to claim 5, characterized in that: The material of the diaphragm is polypropylene.

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