CN115585388A

CN115585388A - High-pressure container and production process thereof

Info

Publication number: CN115585388A
Application number: CN202211146214.0A
Authority: CN
Inventors: 朱豪吉
Original assignee: Zhejiang Kaibo Pressure Vessel Co ltd
Current assignee: Zhejiang Kaibo Pressure Vessel Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-01-10

Abstract

The application discloses high-pressure vessel and production technology thereof, wherein the production technology comprises: installing a metal insert with an expanded structure at a blowing needle, hanging a plastic pipe blank, and carrying out die closing and blow molding to obtain an inner container wrapped with the metal insert; sleeving a metal end enclosure on the metal insert, mounting a first sealing element between the metal end enclosure and the inner container, and mounting a second sealing element between the inner container and the metal insert; a third sealing element is arranged between the metal end enclosure and the metal insert; screwing the metal fastener on the metal insert, and pressing the metal seal head by screwing to tightly press each sealing element; and winding reinforcing fiber on the inner container to obtain a reinforced shell and obtain the high-pressure container. According to the technical scheme disclosed by the application, through the optimized arrangement of the production process, the sealing effect of the bottle head can be effectively improved while the production efficiency is ensured, and the possibility of air tightness failure of the bottle head is reduced; meanwhile, a structural basis is provided for simplifying the assembly process, so that the yield is guaranteed, and the production efficiency and the quality are effectively improved.

Description

High-pressure container and production process thereof

Technical Field

The present application relates to the field of high pressure vessels, and more particularly to high pressure vessels and processes for producing the same.

Background

With the rapid development of human society, the consumption rate of three fossil energy sources of coal, oil and natural gas is increasing, and the supply shortage and environmental problems caused by the consumption rate are receiving more and more attention from various circles. Hydrogen only generates water due to combustion products, has rich sources, is known as a clean energy carrier with the most development potential in the century, and a fuel cell automobile taking hydrogen as an energy source has the characteristics of environmental protection, high efficiency, zero pollution and zero emission.

At present, high-pressure vessels are the storage media for which hydrogen energy is of most practical importance. High-pressure vessels for hydrogen energy can be divided into, according to the technical iteration: a pure steel metal bottle (type I), a steel liner fiber winding bottle (type II), an aluminum liner fiber winding bottle (type III) and a plastic liner fiber winding bottle (type IV). The type I and type II hydrogen storage density is low, the safety performance is poor, and the requirement of vehicle-mounted hydrogen storage density is difficult to meet. By virtue of the advantages of improving safety, reducing weight, improving mass hydrogen storage density and the like, the vehicle-mounted application of the type III bottle and the type IV bottle is wide. Compared with a III type bottle, the plastic inner container of the IV type bottle completely subverts the original gas bottle technology, and becomes a new favorite for leading the development direction of international hydrogen energy automobile high-pressure hydrogen storage containers by virtue of excellent hydrogen embrittlement corrosion resistance, lighter weight, lower cost, higher mass hydrogen storage density and longer cycle life. However, because standard regulations are difficult to advance and technical processes are difficult to overcome, the development of IV-type bottles in China is relatively slow for a long time, the IV-type bottles are still in the research and development stage at present, and a certain gap is still left between the IV-type bottles and the international level in the field.

For example, chinese patent publication No. CN103672387A discloses a 70MPa high-pressure vehicle-mounted carbon fiber fully-wound hydrogen storage cylinder with an aluminum alloy liner; the hydrogen storage cylinder comprises an aluminum alloy inner container, a carbon fiber winding layer and a glass fiber protective layer; and winding the surface of the aluminum alloy inner container with fibers with tension adjusted by impregnating resin according to the laying sequence of the optimized design, then winding a glass fiber anti-impact protective layer on the outer surface of the carbon fiber winding layer, and adopting self-tightening technology treatment in the manufacturing process.

The inventor finds that the prior art of the IV-type bottle has relatively complex integral structure, complicated assembly process and high requirement in order to ensure the sealing effect and the pressure resistance of a plastic liner in high pressure (generally 35MPa to 70 MPa) applied to vehicle-mounted hydrogen storage, and causes small influence on production efficiency, yield and production cost.

Disclosure of Invention

In order to solve the technical problem, the application discloses a production process of a high-pressure container, which comprises the following steps:

s100, installing a metal insert with an expanded structure and a medium channel at a blowing needle of blow molding equipment, hanging a plastic pipe blank to meet the condition that the lower end of the plastic pipe blank is lower than the expanded structure, and performing die closing and blow molding to obtain an inner container wrapped with the metal insert;

s200, sleeving a metal end enclosure on the metal insert, installing a first sealing element between the metal end enclosure and the inner container, and installing a second sealing element between the inner container and the metal insert; installing a third sealing element between the metal end socket and the metal insert;

s300, screwing a metal fastener on the metal insert, and pressing the metal seal head to tightly press the first sealing element, the second sealing element and the third sealing element through screwing;

s400, winding reinforcing fibers on the inner container to obtain a reinforcing shell, and processing the reinforcing shell according to preset conditions to obtain the high-pressure container.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, in S300, the metal sealing head is sleeved with a plastic sealing head, the plastic sealing head is of an annular structure, the inner ring is attached to the outer peripheral surface of the metal sealing head, the first axial end face of the plastic sealing head is attached to the liner, and the second axial end face is an arc face and is matched with the shape of the liner.

Optionally, in S100, after the inner container wrapped with the metal insert is obtained, the inner container is processed to obtain a second sealing chamfer for accommodating the second sealing element, where the second sealing chamfer is attached to the inner edge of the metal insert.

Optionally, in S200, the first sealing element is assembled in an assembly groove on the metal end enclosure and then is matched with the inner container, and the assembly groove is opened toward the expansion structure.

Optionally, in S200, after the second sealing element is assembled in the sealing space, the metal sealing head is assembled on the metal insert to seal the second sealing element.

Optionally, in S200, the aperture of the metal end socket facing one side of the expansion structure is matched with the outer diameter of the inner container wrapped on the metal insert, and the metal end socket drives the inner container to deform by extrusion to complete the assembly of the inner container and the inner container.

Optionally, in S200, a third sealing chamfer for accommodating the third sealing element is disposed on an inner edge of the metal sealing head, which abuts against the metal fastener.

Optionally, in S400, an adaptation ring groove is concavely disposed on the outer radial peripheral surface of the metal end enclosure, and at least a portion of the reinforcing fiber enters the adaptation ring groove on the winding path.

Optionally, in S400, the metal end enclosure faces the outer edge of the end face of the metal fastener and is provided with a clamping shaft shoulder, and the reinforcing fiber wraps the clamping shaft shoulder on the winding path.

The application also discloses the high-pressure container, which is obtained by implementing the production process of the high-pressure container in the technical scheme.

According to the technical scheme disclosed by the application, through the optimized arrangement of the production process, the sealing effect of the bottle head can be effectively improved while the production efficiency is ensured, and the possibility of air tightness failure of the bottle head is reduced; meanwhile, a structural basis is provided for simplifying the assembly process, so that the yield is guaranteed, and the production efficiency and the quality are effectively improved.

Specific advantageous technical effects will be further explained in conjunction with specific structures or steps in the detailed description.

Drawings

FIG. 1 is a schematic view of an exemplary embodiment of a composite high pressure vessel;

FIG. 2 is a schematic diagram of the internal structure of the composite material of FIG. 1;

FIG. 3 is a schematic view from another perspective of the composite autoclave of FIG. 2;

FIG. 4 is a partially enlarged view of the bottle head portion of FIG. 3;

FIG. 5 is a schematic view of the bottle head assembly of FIG. 4;

FIG. 6 is a schematic flow chart illustrating a process for manufacturing a high pressure vessel according to an embodiment;

FIG. 7 is a schematic diagram of a hanging state during the production process of the high-pressure vessel;

FIG. 8 is a schematic view showing a mold clamping state in the production process of a high-pressure vessel;

FIG. 9 is a schematic view of the structure of the liner wrapped with the metal insert during the production process of the high-pressure vessel;

FIG. 10 is a schematic view of a second seal chamfer machining process during the production of a high pressure vessel;

FIG. 11 is a schematic view of the installation of a metal head in the production process of a high-pressure vessel;

FIG. 12 is a schematic view of the installation of a metal fastener in the production process of a high pressure vessel;

FIG. 13 is a schematic view of the structure of the high-pressure vessel produced by the process shown in FIG. 6.

The reference numerals in the figures are illustrated as follows:

1. an inner container; 11. a second seal chamfer;

2. reinforcing the shell;

3. a bottle head; 31. a metal insert; 311. an enlarged structure; 312. a screw connection part; 313. a media channel; 314. a light axis part; 32. a metal end socket; 321. a first fitting hole; 322. a second fitting hole; 323. transition steps; 324. a third sealing chamfer; 325. an adaptation ring groove; 326. clamping a shaft shoulder; 327. assembling a groove; 328. a third seal chamfer; 33. a metal fastener; 34. a clamping chamber; 341. clamping the convex ribs; 35. plastic end sockets;

401. a first seal member; 402. a second seal member; 403. a third seal member;

901. blowing a needle; 902. tube blanks; 903. and (3) blowing the mold.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 6 to 13, the present application discloses a process for producing a high pressure vessel, comprising the steps of:

s100, installing the metal insert 31 with the expanded structure 311 and the medium channel 313 at a blowing needle 901 of blow molding equipment, hanging a plastic pipe blank 902 to meet the condition that the lower end of the plastic pipe blank 902 is lower than the expanded structure 311 (shown by a dotted line in the attached figure 7), and closing and blow molding a blow mold 903 to obtain an inner container 1 wrapped with the metal insert 31;

s200, sleeving the metal end enclosure 32 on the metal insert 31, installing a first sealing element 401 between the metal end enclosure 32 and the liner 1, and installing a second sealing element 402 between the liner 1 and the metal insert 31; a third sealing element 403 is arranged between the metal end socket 32 and the metal insert 31;

s300, screwing the metal fastener 33 on the metal insert 31, and pressing the metal seal head 32 to tightly press the first sealing element 401, the second sealing element 402 and the third sealing element 403 through screwing;

s400, winding reinforcing fibers on the liner 1 to obtain a reinforcing shell 2, and processing the reinforcing shell 2 according to preset conditions to obtain the high-pressure container.

According to the technical scheme disclosed by the application, through the optimized arrangement of the production process, the sealing effect of the bottle head 3 can be effectively improved while the production efficiency is ensured, and the possibility of air tightness failure of the bottle head 3 is reduced; meanwhile, a structural basis is provided for simplifying the assembly process, so that the yield is guaranteed, and the production efficiency and the quality are effectively improved.

In the embodiment shown in fig. 9 and 10, in S100, after the liner 1 wrapped with the metal insert 31 is obtained, the liner 1 is processed against the inner edge of the metal insert 31 to obtain the second sealing chamfer 11 for accommodating the second sealing member 402. The second sealing chamfer 11 can improve the sealing effect of the second sealing element 402, and more importantly, the second sealing chamfer 11 is processed at the moment, so that burrs in the blow molding process can be removed synchronously, and the assembly precision is improved.

Referring to the embodiment shown in fig. 11 and 12, in S200, the first sealing element 401 is assembled in the assembly groove 327 on the metal head 32 and then is matched with the liner 1, and the assembly groove 327 is opened toward the expansion structure 311. After the second seal 402 is fitted into the sealed space, the metal head 32 is fitted onto the metal insert 31 to achieve sealing of the second seal 402. The aperture of metal head 32 towards expanded structure 311 one side matches with the external diameter of inner bag 1 of parcel on metal insert 31, and metal head 32 drives inner bag 1 deformation through the extrusion in order to accomplish assembly between them. The inner edge of the metal end socket 32, which is abutted against the metal fastener 33, is provided with a third sealing chamfer 328324 for accommodating the third sealing element 403.

In an embodiment, in S300, the metal seal head 32 is sleeved with the plastic seal head 35, the plastic seal head 35 is of an annular structure, the inner ring is attached to the outer circumferential surface of the metal seal head 32, the first axial end surface of the plastic seal head 35 is attached to the liner 1, and the second axial end surface is an arc surface and matches with the shape of the liner 1.

In an embodiment, in S400, a recessed fitting ring groove 325 is formed on the outer radial surface of the metal end enclosure 32, and at least a portion of the reinforcing fiber enters the fitting ring groove 325 in the winding path. In S400, a clamping shoulder 326 is disposed on an outer edge of the end surface of the metal end enclosure 32 facing the metal fastener 33, and the reinforcing fiber wraps the clamping shoulder 326 on the winding path.

In combination with the above, the present application also discloses a high pressure vessel, which is obtained by implementing the production process of the high pressure vessel in the above technical scheme. Reference may be made in particular to fig. 13.

The application discloses a high-pressure container, can refer to fig. 1 to 5 and show with specific bottle head structural feature, including inner bag 1, the reinforcing casing 2 of parcel in inner bag 1 and the inside and external bottle head 3 of UNICOM inner bag 1 that are used for accommodating the medium, bottle head 3 includes:

the metal insert 31 comprises an expansion structure 311 pressed against the inner container 1, a screw part 312 extending to the outside and a medium channel 313 penetrating inside and outside;

the metal end enclosure 32 is sleeved on the metal insert 31 and is mutually pressed with the expansion structure 311 to clamp the inner container 1;

the metal fastener 33 is matched with the screwing part 312 to realize the tight abutting between the metal seal head 32 and the expansion structure 311;

a first sealing element 401 arranged between the metal end socket 32 and the inner container 1;

the second sealing piece 402 is arranged between at least two of the metal end enclosure 32, the inner container 1 and the metal insert 31;

and a third sealing member 403 disposed between at least the metal insert 31, the metal head 32, and the metal fastener 33.

The technical scheme that this application discloses sets up through the optimization of bottle head 3 structure, has realized that the multilayer is airtight, is first sealing member 401, second sealing member 402 and third sealing member 403 in proper order to external order according to by inner bag 1, and the airtight effect of bottle head 3 can effectively be improved in the aforesaid setting, separates the atress structure and the seal structure of bottle head, can avoid leading to the decline of sealing performance because of high pressure, reduces the possibility of bottle head 3 airtight inefficacy.

More importantly, the device in the embodiment conveniently overcomes the dependence on the machining precision of each matching part in the prior art, and ensures the sealing effect by adjusting the matching precision in the assembling process, thereby providing a structural basis for simplifying the assembling process, ensuring the yield and effectively improving the production efficiency and the quality.

In the details of the metal insert 31, referring to the embodiment shown in the drawings, the metal insert 31 further includes an optical axis portion 314 disposed between the enlarged structure 311 and the screw-connecting portion 312, the medium channel 313 penetrates through the three, and the metal end enclosure 32 is sleeved on the optical axis portion 314 and has two axial ends for matching the enlarged structure 311 and the metal fastener 33, respectively. Realization and the cooperation of metal head 32 that smooth axial part 314 can be better to avoid the screw thread to the influence of complex, can realize the position adjustment of metal head 32 to a certain extent simultaneously, thereby realize airtight effect between metal head 32, the structure 311 that enlarges and the inner bag 1 through metal fastener 33. In the present embodiment, the inner diameter of the metal cap 32 matches the outer diameter of the optical axis portion 314. Theoretically, the inner diameter of the metal end socket 32 and the outer diameter of the optical axis 314 are precisely matched, and in order to reduce the dependence on the precision, the two are in clearance fit in the actual product, but the clearance dimension should not be too large and should be smaller than the size of the sealing element, so as to avoid the sealing failure.

Similarly, in the detailed arrangement of the metal sealing head 32, referring to the embodiment shown in the drawings, the metal sealing head 32 is a stepped hole as a whole and includes a first adaptive hole 321 and a second adaptive hole 322 which are communicated with each other, a transition step 323 is arranged between the first adaptive hole 321 and the second adaptive hole 322, the first adaptive hole 321 is matched with the optical axis portion 314 in size, the second adaptive hole 322 is slightly larger than the outer diameter of the optical axis portion 314 to form the holding chamber 34, and the end surface of the liner 1 abuts against the transition step 323. The arrangement of the stepped holes can provide a limiting effect for the assembling process, the assembling efficiency is improved, and meanwhile, the assembling precision is improved, so that the air tightness effect is improved.

The clamping chamber 34 is realized by the cooperation of the metal insert 31 and the metal seal head 32, in the embodiment shown in the drawings, at least a part of the metal seal head 32 is arranged with a gap from the light axis portion 314 to form the clamping chamber 34, the liner 1 extends into the clamping chamber 34 via the axial gap between the metal seal head 32 and the expanding structure 311, and the metal insert 31 and/or the metal seal head 32 is/are provided with a clamping convex rib 341 extending towards the clamping chamber 34. The holding chamber 34 can provide a relatively closed space, thereby providing a stable sealing effect. The clamping ribs 341 can further improve the clamping effect of the metal insert 31 and/or the metal end socket 32 on the liner 1, so that the pressure resistance of the liner 1 can be improved. In practical products, the clamping chamber 34 can extend along the surfaces of the metal insert 31 and the metal seal head 32 to form a longer dimension, and the radial dimension can also gradually change in the axial direction of the liner 1 to form the clamping chamber 34 with a three-dimensional space, so that the constraint effect of the metal insert 31 and the metal seal head 32 on the liner 1 is further improved.

In the arrangement of the sealing elements, in the embodiment shown in the drawings, the first sealing element 401 is arranged on the end face of the metal head 32 facing the expansion structure 311. The second seal 402 is disposed between the end surface of the liner 1 and the transition step 323. The inner edge of the metal seal head 32, which abuts against the metal insert 31, is provided with a third sealing chamfer 324, and a third sealing member 403 is arranged between the third sealing chamfer 324 and the peripheral surface of the optical axis portion 314. Above-mentioned setting can provide the restraint effect for the sealing member when guaranteeing the assembly effect, avoids leading to the deformation and the aversion of sealing member under the pressure effect to improve high pressure vessel's whole life-span.

As will be understood from the above description, the inner container 1 and the bottle head 3 constitute an airtight system, but the pressure resistance needs to be achieved by the reinforcing case 2. In the prior art, the reinforcing shell 2 and the bottle head 3 are independently arranged, and the bottle head 3 and the reinforcing shell 2 are easily weak at the joint.

Referring to the embodiment shown in the drawings, a recessed fitting ring groove 325 is formed on the outer radial periphery of the metal head 32, and at least a portion of the reinforcing shell 2 is embedded in the fitting ring groove 325. The fitting of the fitting ring groove 325 with the reinforcing case 2 can effectively improve the entire pressure-resistant strength. Further, the outer edge of the end face of the metal end socket 32 facing the metal fastener 33 is provided with a clamping shoulder 326, and the reinforcing shell 2 at least wraps the clamping shoulder 326. This arrangement can further improve the overall compressive strength and provide a more product appearance.

In addition to the optimization of the structure of the bottle head 3 (multiple sealing and compact layout), in the embodiment shown in the drawing, the bottle head 3 further includes a plastic end enclosure 35 sleeved on the metal end enclosure 32, the plastic end enclosure 35 is in an annular structure, the inner ring is attached to the outer peripheral surface of the metal end enclosure 32, the first axial end face of the plastic end enclosure 35 is attached to the liner 1, and the second axial end face is an arc face and is matched with the shape of the liner 1. The plastic end socket 35 can adjust the overall shape of the inner container 1 at the bottle head 3 position, so that the fiber winding is facilitated, a more regular reinforcing shell 2 is formed, and a structural foundation is provided for other optimized settings.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

1. The production process of the high-pressure container is characterized by comprising the following steps of:

2. The production process of the high-pressure container according to claim 1, wherein in S300, a plastic end socket is sleeved on the metal end socket, the plastic end socket is of an annular structure, an inner ring is attached to the outer circumferential surface of the metal end socket, a first axial end face of the plastic end socket is attached to the liner, and a second axial end face of the plastic end socket is an arc face and is matched with the shape of the liner.

3. The process for manufacturing a high-pressure container according to claim 1, wherein in step S100, after obtaining the liner wrapped with the metal insert, the liner is processed against the inner edge of the metal insert to obtain a second sealing chamfer for receiving the second sealing member.

4. The process for producing a high-pressure container according to claim 1, wherein in S200, the first sealing member is assembled in an assembly groove of the metal end socket and then is matched with the inner container, and the assembly groove is opened toward the expansion structure.

5. The process for producing a high-pressure container according to claim 4, wherein in S200, after the second sealing member is assembled in the sealing space, the metal end socket is assembled on the metal insert to achieve sealing of the second sealing member.

6. The production process of the high-pressure container according to claim 5, wherein in S200, the diameter of the metal seal head facing one side of the expanded structure is matched with the outer diameter of the liner wrapped on the metal insert, and the metal seal head drives the liner to deform by extrusion so as to complete the assembly of the metal seal head and the liner.

7. The process for producing a high-pressure vessel according to claim 6, wherein in step S200, a third sealing chamfer for receiving the third sealing element is provided at an inner edge of the metal end socket, which is abutted against the metal fastener.

8. The process for producing a high-pressure vessel according to claim 1, wherein in S400, a recessed fitting ring groove is formed in a radially outer peripheral surface of the metal end socket, and at least a portion of the reinforcing fiber enters the fitting ring groove along a winding path.

9. The process for producing a high-pressure vessel according to claim 8, wherein in S400, a clamping shoulder is provided on an outer edge of the metal end socket facing the end face of the metal fastener, and the reinforcing fiber wraps the clamping shoulder on the winding path.

10. High-pressure vessel, characterized in that it is obtained by a process for the production of a high-pressure vessel according to any one of claims 1 to 9.