CN112856205A - Flange connecting piece, composite high-pressure container and forming method - Google Patents
Flange connecting piece, composite high-pressure container and forming method Download PDFInfo
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- CN112856205A CN112856205A CN202011617883.2A CN202011617883A CN112856205A CN 112856205 A CN112856205 A CN 112856205A CN 202011617883 A CN202011617883 A CN 202011617883A CN 112856205 A CN112856205 A CN 112856205A
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- flange
- connecting piece
- inner container
- boss
- hole
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
- F17C1/04—Protecting sheathings
- F17C1/06—Protecting sheathings built-up from wound-on bands or filamentary material, e.g. wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/06—Closures, e.g. cap, breakable member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0602—Wall structures; Special features thereof
- F17C2203/0612—Wall structures
- F17C2203/0614—Single wall
- F17C2203/0619—Single wall with two layers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0658—Synthetics
- F17C2203/0663—Synthetics in form of fibers or filaments
- F17C2203/0673—Polymers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0311—Closure means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/21—Shaping processes
- F17C2209/2154—Winding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of fluid
- F17C2260/036—Avoiding leaks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention discloses a flange connecting piece, a composite high-pressure container and a forming method, wherein the flange connecting piece is used for sealing a polar hole part of the composite high-pressure container and comprises a flange main body and a flange flanging which are of an integral structure, the inner molded surface of the flange main body is a curved surface, a raised embedding boss is arranged on the inner molded surface of the flange main body, and the embedding boss is annular so that the embedding boss and the inner molded surface of the flange main body form a limiting step. The flange connecting piece effectively covers fiber accumulation and fiber overhead of the high-pressure container close to the polar hole area, and the flange flanging increases the bonding area of the flange connecting piece and the self structure of the high-pressure container, so that the connecting strength is improved; through boss and flange turn-ups, increased the stroke when gas leakage, reduced the utmost point hole position and revealed the risk, can effectively improve the leakproofness when the container bears interior pressure.
Description
Technical Field
The invention relates to the field of pressure vessels, in particular to a flange connecting piece, a composite high-pressure vessel and a forming method.
Background
The carbon fiber composite material has the advantages of light weight, high strength, high rigidity, designability and the like, is a very good structural material, and particularly belongs to the field of aerospace and pressure containers. The development of all-composite high-pressure vessels is also a necessary trend.
In the prior art, one difficulty in the forming of the full-composite high-pressure container is the sealing problem of the connecting parts at two ends, so that the existing full-composite high-pressure container has a certain leakage risk under high pressure.
Disclosure of Invention
In order to solve the technical problems, the invention provides a flange connecting piece, a composite high-pressure container and a forming method, which effectively increase the stroke when gas leaks, reduce the leakage risk of a polar hole part, play a role in sealing the polar hole part and ensure the connection strength of the composite high-pressure container at the polar hole part.
The flange connecting piece comprises a flange main body and a flange flanging which are of an integral structure, wherein a raised embedding boss is arranged on the inner molded surface of the flange main body, and the embedding boss is annular and surrounds the hole edge of the central hole of the flange main body, so that the embedding boss and the inner molded surface of the flange main body form a limiting step.
Further, an annular sealing groove is formed in the outer end face of the flange main body.
Furthermore, more than 2 connecting blind holes are formed in the outer end face of the flange main body, and the more than 2 connecting blind holes are distributed at intervals along the circumferential direction; or the central hole is a threaded hole.
Further, the thickness h1 of the joint of the flange flanging and the flange main body is more than or equal to KxS × P2/(P1 × C), wherein P1 is the material shear strength of the flange connecting piece; c is the outer circumference of the flange main body; k is a set safety coefficient; s is the sectional area of the flange main body; p2 is the product burst pressure.
Based on the same inventive concept, the invention also correspondingly provides a composite high-pressure container, which comprises an inner container, an outer structure composite layer and the flange connecting piece; the inner profile and the outer profile of the inner container are both curved surfaces, and the end part of the inner container is provided with a polar hole; the flange connecting piece is arranged on the pole hole, and the inner profile of the flange connecting piece is attached to the outer profile of the inner container; the embedded boss extends into the pole hole and is limited by the limiting step, and the outer profile of the flange flanging is tangent to the outer profile of the inner container; the outer structure composite layer is coated on the flange flanging and the inner container which is not covered by the flange flanging.
Further, the height h2 of the boss is the same as the thickness of the inner container at the position of the pole hole.
Furthermore, the thickness of the edge of the flange flanging and the tangent point position of the outer molded surface of the inner container is not more than 0.4 mm.
Further, the overall height H of the flange connecting piece is more than or equal to H1+ H2+ H3, wherein H1 is the thickness of the connecting position of the flange flanging and the flange main body, H2 is the height of the embedded boss, and H3 is the thickness of the outer structure composite layer.
Based on the same inventive concept, the invention also correspondingly provides a forming method of the composite high-pressure container, which comprises the following steps:
1) forming a flange connecting piece and forming an inner container;
2) the inner container is bonded and formed with the flange connecting piece; mounting the flange connecting piece on the liner, ensuring that the embedded boss extends into the polar hole and is limited by the limiting step, and bonding and fixing the flange connecting piece and the liner by using a bonding tool and bonding glue solution;
3) winding and forming an outer structure composite layer; forming an outer structure composite layer in a fiber winding mode so that the outer structure composite layer is coated on the flange flanging and the liner which is not covered by the flange flanging;
4) and curing and forming to obtain the composite high-pressure container.
Further, before the curing molding, the molding method further includes potting the gap between the outer structure composite layer and the flange connection member with epoxy resin or liquid rubber.
According to the technical scheme, the flange connecting piece provided by the invention can be applied to the sealing of the polar hole part of the composite high-pressure container, and comprises the flange main body and the flange flanging which are of an integral structure, so that the bonding area of the flange connecting piece and the high-pressure container self structure at the polar hole part is increased through the flange flanging, and the connecting strength is further improved. The flange comprises a flange main body and is characterized in that a raised embedding boss is arranged on the inner profile of the flange main body, the embedding boss is annular and surrounds the hole edge of the central hole of the flange main body, so that the embedding boss and the inner profile of the flange main body form a limiting step, and the positioning with a pole hole is realized. The flange connecting piece effectively piles up the fibre that high-pressure vessel is close to the utmost point hole region and built on stilts covers with the fibre, simultaneously through flange connecting piece's boss and flange turn-ups, has increased the stroke when gas reveals, has reduced the utmost point hole position and has revealed the risk, can effectively improve the leakproofness when the container bears interior pressure.
The composite high-pressure container provided by the invention adopts the flange connecting piece, and comprises an inner container, an outer structure composite layer and the flange connecting piece; the inner profile and the outer profile of the inner container are both curved surfaces, and the end part of the inner container is provided with a polar hole; the inner container is used as a framework of the composite high-pressure container, provides high strength for the high-pressure container to bear, provides internal winding support for the forming of an outer structure composite layer, and is also used as a base body adhered with the flange connecting piece to provide support. The flange connecting piece is arranged on the pole hole, and the inner profile of the flange connecting piece is attached to the outer profile of the inner container, so that the connection is tight; the embedded boss extends into the pole hole and is limited by the limiting step, so that the positioning and bonding effect with the liner is achieved, the bonding area between the flange connecting piece and the liner is increased, the bonding strength is improved, and meanwhile, the boss plays a role in protecting the liner; the outer molded surface of the flange flanging is tangent to the outer molded surface of the inner container; the flange flanging increases the bonding area and the connection strength of the inner container and the outer structure composite layer, and further improves the connection strength. The flange connecting piece is used for ensuring the connection sealing performance of the inner container and the outer structure composite layer at the pole hole part and realizing external connection. The outer structure composite layer is coated on the flange flanging and the liner which is not covered by the flange flanging, and the outer structure composite layer is used as a main bearing structure for the internal pressure of the composite high-pressure container, so that the sealing performance of the composite high-pressure container at the pole hole part is further ensured, and the function of bearing the internal pressure is achieved.
The forming method provided by the invention is used for producing the composite high-pressure container, and comprises the following steps: 1) forming a flange connecting piece and forming an inner container; 2) the inner container is bonded and formed with the flange connecting piece; 3) winding and forming an outer structure composite layer; forming an outer structure composite layer in a fiber winding mode; 4) and (5) curing and forming. In the step 1), the size structures of the flange connecting piece and the inner container are designed according to the strength requirement and are processed and molded. In the step 2), the flange connecting piece is installed on the inner container, the flange connecting piece and the inner container are bonded and fixed through the limiting step, the bonding tool and the bonding glue solution, the flange connecting piece and the inner container are axially limited and pressed through the bonding tool, bonding pressure is provided, and the bonding strength and the sealing performance after bonding are guaranteed. And 3) forming an outer structure composite layer in a fiber winding mode, so that the outer structure composite layer is coated on the flange flanging and the liner which is not covered by the flange flanging to form a main bearing structure of the internal pressure of the high-pressure container. And 4) carrying out curing molding under the set conditions to obtain the molded composite high-pressure container.
Compared with the prior art, the invention changes the end socket structure of the end part of the main body, and effectively enhances the sealing performance of the composite high-pressure container at the end socket through the end socket structure. The end socket structure comprises a part of the inner container at the polar hole, a flange connecting piece and a part of outer structure composite layer, wherein the flange connecting piece is embedded between the inner container and the outer structure composite layer, so that fiber accumulation and fiber overhead coverage of the inner container in a region close to the polar hole are effectively covered, and meanwhile, the flange flanging increases the bonding area of the flange connecting piece with the inner container and the outer structure composite layer, so that the connection strength is improved; through the boss and the flange flanging of the flange connecting piece, the stroke when gas leaks is increased, the leakage risk of the polar hole part is reduced, and the effect of sealing the polar hole part is achieved. The forming method of the composite high-pressure container provided by the invention is designed for each component of the composite high-pressure container, and the sealing property and the connection strength of the pole hole part of the formed composite high-pressure container are ensured by the design of each component.
Drawings
Fig. 1 is a full-section structural view of a flange connector provided in embodiment 1 of the present invention;
fig. 2 is a plan view of a flange connection member provided in embodiment 1 of the present invention;
fig. 3 is a full sectional view of 1/2 part of the composite high-pressure vessel provided in example 2 of the present invention;
fig. 4 is a schematic view of an application structure of the adhesion tool provided in embodiment 3 of the present invention.
Description of the drawings: 1-a flange connection; 101-a flange body; 102-flanging a flange; 103-a central hole; 104-an insert boss; 105-connecting blind holes; 106-sealing groove; 2-inner container; 3-outer structure composite layer; 4-bonding the tool; 401-supporting the shaft; 402-nut.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
In the prior art, one difficulty in the forming of the full-composite high-pressure container is the sealing problem of the connecting parts at two ends, so that the existing full-composite high-pressure container has a certain leakage risk under high pressure. In order to solve the technical problem, the invention provides a flange connecting piece, which has the following basic inventive concept:
the utility model provides a flange connecting piece, the application object includes but not limited to compound high-pressure vessel, can be used to the sealed of compound high-pressure vessel's utmost point hole position, flange main part and flange turn-ups including integrative structure, the interior profile of flange main part and flange turn-ups all matches with compound high-pressure vessel's structure, be provided with bellied embedding boss on the interior profile of flange main part, the embedding boss is the annular, and encircle the hole edge who sets up in the centre bore of flange main part, so that the embedding boss constitutes spacing step with the interior profile of flange main part, in order to realize with the location of utmost point hole.
Based on the same invention concept, the invention also provides a composite high-pressure container and a forming method, the technical scheme of the invention can effectively increase the stroke of gas leakage, reduce the leakage risk of the polar hole part, play a role in sealing the polar hole part and ensure the connection strength of the composite high-pressure container at the polar hole part. The following examples are intended to illustrate the invention in more detail:
example 1
The invention provides a flange connecting piece 1, which is applied to objects including but not limited to a composite high-pressure container and can be used for sealing a polar hole part of the composite high-pressure container, and comprises a flange main body 101 and a flange flanging 102 which are of an integral structure, wherein the inner profile of the flange main body 101 is set to be a structure matched with the outer profile of the composite high-pressure container, a convex embedding boss 104 is arranged on the inner profile of the flange main body 101, and the embedding boss 104 is annular and surrounds the hole edge of a central hole 103 arranged in the flange main body 101, so that the embedding boss 104 and the inner profile of the flange main body 101 form a limiting step to realize the positioning with the polar hole.
The flange connecting piece 1 effectively covers fiber accumulation and fiber overhead of the high-pressure container near the polar hole area, and meanwhile, the flange flanging 102 increases the bonding area of the flange connecting piece 1 and the high-pressure container self structure at the polar hole, so that the connecting strength is improved; through the boss of the flange connecting piece 1 and the flange flanging 102, the stroke of gas leakage is increased, the leakage risk of a polar hole part is reduced, and the sealing performance of the container when bearing internal pressure can be effectively improved. The thickness of the joint of the flange flanging 102 and the flange main body 101 should meet the requirements of calculation strength and design structure, wherein the calculation strength is calculated by the following method: the calculation formula is h1 is more than or equal to KxSxP 2/(P1 xC), wherein P1 is the material shear strength of the flange connecting piece 1; c is the outer circumference of the flange body 101; k is a set safety coefficient; s is the cross-sectional area of the flange body 101; p2 is the product burst pressure. In the process that the high-pressure container bears internal pressure, the flange at the pole hole part is complex in stress condition and is influenced by multiple factors such as flange deformation, inner container 2 deformation, outer structure composite layer deformation, interface bonding strength and the like besides the strength of the material, so that the calculated value can only be used as one of important factors in design, and the final structure needs to be determined after comprehensive simulation check and optimized after actual verification.
The flange main body 101 is mainly used for realizing external connection, in the embodiment, the flange main body 101 has two external connection realization modes, the specific structure is determined by the size of the flange connecting piece 1, if the size of a pole hole of a high-pressure container is larger or the size of a center hole 103 of the flange main body is larger, the size of the flange connecting piece 1 is also larger, more than 2 connecting blind holes 105 are arranged on the outer end face of the flange main body 101, and more than 2 connecting blind holes 105 are distributed at intervals along the circumferential direction. In order to satisfy the connection strength and ensure the connection in the internal pressure bearing state, in the present embodiment, 8 connection blind holes 105 are uniformly distributed at intervals in the circumferential direction, as shown in fig. 2. When the size of the flange connecting piece 1 is small, a connecting hole is not formed in the end face of the flange in enough space, and a thread can be formed in an inner hole of the flange connecting piece 1, namely, a central hole 103 of the flange connecting piece 1 is a threaded hole, so that external connection is realized.
In order to ensure the sealing performance after connection, in the present embodiment, an annular sealing groove 106 is provided on the outer end surface of the flange main body 101 for installing a sealing ring.
In order to reduce the mass of the flange connection 1 itself, in the present embodiment, it is preferable that the hole wall of the annular hole of the embedding boss 104 be flush with the hole wall of the central hole 103. Meanwhile, the flange 102 is of a variable thickness structure, that is, the flange 102 is a variable thickness transition region between the flange main body 101 and the sealing portion, and the inner profile and the outer profile of the flange are smooth surfaces.
The embodiment provides the flange connecting piece 1 for sealing polar holes at two ends of a spherical surface aiming at pressure vessels such as a full-composite material high-pressure vessel or a gas cylinder, and compared with the prior art, the flange connecting piece 1 effectively covers fiber accumulation and fiber overhead of the high-pressure vessel close to the polar hole area, and meanwhile, the flange flanging 102 increases the bonding area of the flange connecting piece 1 and the high-pressure vessel self structure at the polar hole, so that the connection strength is improved; through the boss of the flange connecting piece 1 and the flange flanging 102, the stroke of gas leakage is increased, the leakage risk of a polar hole part is reduced, and the sealing performance of the container when bearing internal pressure can be effectively improved.
Example 2
Based on the same inventive concept, the present embodiment provides a composite high pressure vessel, which includes an inner container 2, an outer structural composite layer 3, and the flange connection member 1 of embodiment 1. The flange connecting piece 1 is used for sealing the end of the composite high-pressure container and realizing external connection, and the connection strength and the sealing performance between the flange connecting piece 1 and the outer structure composite layer 3 and the inner container 2 of the composite high-pressure container are key points for solving the technical problems in the prior art.
In the embodiment, the inner profile and the outer profile of the inner container 2 are both curved surfaces to uniformly bear the internal air pressure, and the end part of the inner container 2 is provided with an electrode hole; the inner container 2 is used as a framework of the composite high-pressure container and provides support. The flange connecting piece 1 is arranged on the pole hole, and the inner molded surface of the flange connecting piece 1 is attached to the outer molded surface of the inner container 2, so that the connection is tight; the embedded boss 104 extends into the pole hole and is limited by the limiting step, so that the positioning and bonding effect with the liner 2 is achieved, the bonding area between the flange connecting piece 1 and the liner 2 is increased, the bonding strength is improved, and meanwhile, the boss plays a role in protecting the liner 2; the outer surface of the flange flanging 102 is tangent to the outer surface of the inner container 2; the flange flanging 102 increases the bonding area and the connection strength of the inner container 2 and the outer structure composite layer 3, and further improves the connection strength. The flange connecting piece 1 is used for ensuring the connection sealing performance of the inner container 2 and the outer structure composite layer 3 at the pole hole part and realizing external connection. The outer structure composite layer 3 is coated on the flange flanging 102 and the liner 2 which is not covered by the flange flanging 102, and the outer structure composite layer 3 is used as a main bearing structure for the internal pressure of the composite high-pressure container; the sealing performance of the composite high-pressure container at the pole hole part is further ensured, and the function of bearing internal pressure is achieved.
The inner container 2 is used as a framework of the composite high-pressure container and provides support, and the inner container 2 is mostly of a thin-shell structure, generally, the inner container 2 is a thin-wall composite material inner container with the thickness not exceeding 1mm, or is of a grid rib and skin structure. In order to ensure the supporting strength of the liner 2, in this embodiment, the liner 2 is preferably a structure of grid ribs and a skin. The inner container 2 mainly has 3 functions, and firstly, the grid ribs of the inner container 2 have higher strength and can provide higher strength bearing for the high-pressure container; secondly, the inner container 2 provides internal winding support for the forming of the external structure composite layer 3; and thirdly, the composite material is used as a base body of the end enclosure structure of the high-pressure container.
The outer structure composite layer 3 is mainly formed by winding fibers and serves as a main bearing structure for the internal pressure of the high-pressure container. In this embodiment, the fiber adopted by the outer structure composite layer may be glass fiber, carbon fiber, aramid fiber, or the like, and the resin may be an organic resin such as epoxy resin, cyanate resin, or the like, which is not specifically limited in this embodiment, and the specific external dimension is also determined by design calculation and check.
In the embodiment, the height h2 of the embedded boss 104 is not limited, and the stability limit is satisfied. In order to ensure the connection strength without changing and affecting the structure and performance of the composite high-pressure container, in the embodiment, the height h2 of the boss of the flange connector 1 is preferably the same as the thickness of the liner 2 at the pole hole position, so that the inner end surface of the boss is flush with the end of the inner profile of the liner 2.
In order to ensure the connection strength between the flange 102 and the outer structure composite layer 3 and reduce the height of the end face of the flange 102, in this embodiment, the flange 102 is of a variable thickness structure, the inner profile of the flange 102 is consistent with the outer profile of the inner container 2, and the outer profile is tangent to the outer profile of the inner container 2, that is, the flange 102 is a variable thickness transition region from the flange main body 101 to the tangent point of the outer profile of the inner container 2, so that the connection strength is ensured, the self weight of the flange connecting member 1 can be reduced, and in order to meet the process forming requirement and reduce the step difference of the tangent point position, in this embodiment, the thickness of the end of the flange 102, that is, the tangent point position between the end of the flange and the outer profile of the inner container 2, should.
In order to meet the connection strength, in the embodiment, the overall height H of the flange connector 1 is greater than or equal to H1+ H2+ H3, wherein H1 is the thickness of the joint of the flange 102 and the flange main body 101, H2 is the height of the embedded boss 104, and H3 is the thickness of the outer structure composite layer 3.
Compared with the prior art, the composite high-pressure container provided by the invention has the advantages that the sealing performance of the composite high-pressure container at the end head is effectively enhanced by changing the end socket structure of the end part of the main body. The end socket structure comprises a part of the inner container 2 at the polar hole, a flange connecting piece 1 and a part of the outer structure composite layer 3, wherein the flange connecting piece 1 is embedded between the inner container 2 and the outer structure composite layer 3, so that fiber accumulation and fiber overhead coverage of the inner container 2 close to the polar hole area are effectively carried out, and meanwhile, the flange flanging 102 increases the bonding area of the flange connecting piece 1, the inner container 2 and the outer structure composite layer 3, so that the connection strength is improved; through the boss of the flange connecting piece 1 and the flange flanging 102, the stroke of gas leakage is increased, the leakage risk of the polar hole part is reduced, and the effect of sealing the polar hole part is achieved.
Example 3
Based on the same inventive concept, this embodiment provides a molding method for producing the composite high-pressure container in embodiment 2, which ensures the sealing property and the connection strength of the pole hole portion of the molded composite high-pressure container, and the molding method specifically includes the following steps:
1) flange connecting piece molding and inner container molding.
The final structural dimensions of the flange connection 1 are determined by the product inner container 2 and outer structural composite layer 3 structure and the load-bearing capacity thereof. Its specific structure size can be adjusted according to actual conditions, and in this embodiment, flange connection 1 adopts the structure of fig. 2, and H1 value is 3mm, and H2 value is 8mm, and is the same with inner bag 2 utmost point hole position thickness, and H value 20mm, and wherein outer structure composite bed 3 is 8mm at the thickness of utmost point hole position, and the edge thickness requirement of flange turn-ups 102 is not more than 0.2 mm. In this embodiment, the material of the flange connector 1 is not particularly limited as long as the flange connector 1 can perform the function of sealing gas, and preferably, the flange connector 1 is made of a metal material, and the surface roughness and the control precision of the external dimension of the flange connector are both high.
The inner container 2 provides high strength bearing for the high-pressure container and provides internal winding support for forming the outer structure composite layer 3; and also as a base body to which the flange joint 1 is adhered. The forming method includes but is not limited to forming by adopting a prepreg cloth laying-hot pressing process, a fiber winding process, a prepreg silk laying process and the like; the material includes but is not limited to fiber reinforced composite material, wherein the fiber can be glass fiber, carbon fiber, aramid fiber, BPO fiber and the like, the resin is organic resin such as epoxy resin, cyanate ester resin and the like, and the material is determined according to design requirements
In order to satisfy the supporting strength, the inner container 2 of the composite high-pressure container of the present embodiment is preferably of a structure of grid ribs and skin. The grid ribs are generally of a spiral winding structure, a non-geodesic wire winding structure and a geodesic wire winding structure, are formed by winding fibers, and the cross section size of the grid ribs is determined according to design requirements. The grid ribs can also be in a ring rib and longitudinal rib structure, and are generally formed by adopting a one-way prepreg cloth laying layer-autoclave, wherein the pressure is vacuum and external pressure, the vacuum is controlled to be-0.08 MPa-0.1 MPa, and the external force is controlled to be 0.1 MPa-1 MPa. The covering is mainly formed by winding fibers, the thickness of the covering is generally not more than 1mm, and the requirement of internal support during the subsequent sealing layer forming and the outer structure composite layer winding forming is met. In the embodiment, the grid ribs are in a winding line shape of a non-geodesic wire, the cross section of each grid rib is a rectangle with the size of 6mm multiplied by 8mm, the space between the grid ribs can be changed along with the change of the diameter, and particularly, the space between the grid ribs is increased along with the increase of the diameter of the spherical liner 2 at the end part; the skin is formed by winding a non-geodesic wire, and the thickness is designed to be 0.8 mm; the inner container 2 adopts a T700-12K/epoxy resin system.
In the process of forming the inner container, high points are formed on the outer surface of the inner container 2 due to the overlapping and covering of fibers at the node positions, and in order to ensure the attaching degree between the flange connecting piece 1 and the inner container 2 and the smoothness of the winding base body of the outer structure composite layer 3, in the embodiment, the high points of the inner container 2 need to be processed or polished in a mechanical processing mode after the inner container is formed so as to improve the smoothness of the surface of the inner container 2, and then the inner container 2 and the flange connecting piece 1 are subjected to bonding forming.
2) The inner container is bonded and formed with the flange connecting piece; mounting the flange connecting piece 1 on the inner container 2, ensuring that the embedded boss 104 extends into the pole hole and is limited by the limiting step, and bonding and fixing the flange connecting piece 1 and the inner container 2 by using the bonding tool 4 and the bonding glue solution; and (3) respectively bonding the flange connecting pieces 1 at the polar hole parts at the two ends of the inner container 2 by adopting the bonding tool 4 for assistance.
Specifically, in this embodiment, the bonding tool 4 includes a support shaft 401 and a lock nut 402, the support shaft 401 passes through two pole holes of the liner 2, an external thread is processed on the support shaft 401, and the flange connector 1 and the liner 2 are axially limited and pressed by the lock nut 402. The bonding tool 4 has the functions of axial pressurization and bonding positioning, and ensures accurate position and reliable bonding between the flange connecting piece 1 and the inner container 2.
The adhesive glue solution is made of epoxy resin with good toughness or liquid rubber with high strength, and aims to provide the adhesive property between the flange connecting piece 1 and the inner container 2, coordinate the deformation between the flange connecting piece 1 and the inner container 2 when the high-pressure container is subjected to internal pressure, avoid interface debonding and reduce the risk of storage medium leakage. In this embodiment, the adhesive resin is preferably tough epoxy resin J-319, which has an elongation at break of 6% or more.
3) Winding and forming an outer structure composite layer; connecting the winding mandrel to the bonded flange connecting piece 1, and forming the outer structure composite layer 3 in a fiber winding mode, so that the outer structure composite layer 3 is coated on the flange flanging 102 and the liner 2 which is not covered by the flange flanging 102 to form a main bearing structure for the internal pressure of the high-pressure container. Specifically, the fibers should contact the outside of the flange joint 1 during winding, minimizing the gap therebetween. In this embodiment, the outer structure composite layer 3 is formed by winding a non-geodesic wire by using a material system which is the same as the grid ribs of the liner 2, namely, a T700-12K/epoxy resin system.
In order to ensure the connection strength between the flange connector 1 and the outer structure composite layer 3 and further ensure the sealing performance, in this embodiment, before the curing molding, the gap between the outer structure composite layer 3 and the flange connector 1 may be encapsulated by epoxy resin or liquid rubber, and then the curing molding process is performed.
4) And (3) curing and forming, namely heating and curing the structure obtained in the step (3) under a set condition to obtain the composite high-pressure container of the example 2. The curing temperature is determined according to the selected resin, the selected resin material and the corresponding curing temperature are not particularly limited in this embodiment, and generally, the molding temperature for curing molding is controlled to be in the range of room temperature to 180 ℃. As a specific example, when the epoxy resin of the medium-temperature system is selected as the fixing resin, the molding temperature for curing molding is as follows: the temperature is between room temperature and 80 +/-5 ℃ (the temperature is kept for 2h) and 100 +/-5 ℃ (the temperature is kept for 2h) and 120 +/-5 ℃ (the temperature is kept for 4h), and the temperature rising rate is controlled according to 30 ℃/h.
According to the forming method of the composite high-pressure container, the sealing performance and the connection strength of the end socket structure are guaranteed by controlling the forming method, so that the flange connecting piece 1 is embedded into the composite material interlayer, and the connection strength of the flange connecting piece and the composite material interlayer is increased; meanwhile, the flange turnup 102 effectively covers fiber accumulation and fiber overhead of the inner container 2 close to the polar hole region, leakage risks of the polar hole are reduced, the flange turnup 102 increases the bonding area between the flange connecting piece 1 and the inner container 2 and between the flange turnup 102 and the outer structure composite layer 3, and therefore the connecting strength is improved; further, the flanging increases the gas leakage path and reduces the risk. The forming method provided by the invention designs the corresponding forming method for each component of the composite high-pressure container, and ensures the sealing property and the connection strength of the pole hole part of the formed composite high-pressure container for the design of each component.
Through the embodiment, the invention has the following beneficial effects or advantages:
1) compared with the prior art, the flange connecting piece can effectively cover fiber accumulation and fiber overhead of a high-pressure container close to a polar hole area, and meanwhile, the flange flanging increases the bonding area of the flange connecting piece and the high-pressure container self structure at the polar hole, so that the connecting strength is improved; through the boss and the flange flanging of the flange connecting piece, the stroke when gas leaks is increased, the leakage risk of the polar hole part is reduced, and the sealing performance of the container when the container bears internal pressure can be effectively improved.
2) Compared with the prior art, the composite high-pressure container provided by the invention has the advantages that the sealing performance of the composite high-pressure container at the end head is effectively enhanced through the sealing head structure by changing the sealing head structure at the end part of the main body. Fiber accumulation and fiber overhead in the area of the liner close to the polar hole are effectively covered by the flange connecting piece, and meanwhile, the flange flanging increases the bonding area of the flange connecting piece with the liner and an outer structure composite layer, so that the connecting strength is improved; through the boss and the flange flanging of the flange connecting piece, the stroke when gas leaks is increased, the leakage risk of the polar hole part is reduced, and the effect of sealing the polar hole part is achieved.
3) The forming method of the composite high-pressure container provided by the invention is designed for each component of the composite high-pressure container, and the sealing property and the connection strength of the pole hole part of the formed composite high-pressure container are ensured by the design of each component.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. The utility model provides a flange connecting piece, its characterized in that, flange connecting piece includes flange main part and the flange turn-ups of an organic whole structure, be provided with bellied embedding boss on the interior profile of flange main part, the embedding boss be the annular, and encircle set up in the hole edge of the centre bore of flange main part, so that the embedding boss with the interior profile of flange main part constitutes spacing step.
2. The flange connector of claim 1, wherein the outer end face of the flange body is provided with an annular seal groove.
3. The flange connector according to claim 1, wherein more than 2 connecting blind holes are arranged on the outer end face of the flange main body, and the more than 2 connecting blind holes are distributed at intervals along the circumferential direction; or the central hole is a threaded hole.
4. The flange connector of claim 1, wherein the thickness h1 of the flange at the connection with the flange body is greater than or equal to K x S x P2/(P1 x C), wherein P1 is the material shear strength of the flange connector; c is the outer circumference of the flange main body; k is a set safety coefficient; s is the sectional area of the flange main body; p2 is the product burst pressure.
5. A composite high pressure vessel comprising an inner vessel, an outer structural composite layer and a flange joint according to any one of claims 1 to 4; the inner profile and the outer profile of the inner container are both curved surfaces, and the end part of the inner container is provided with a polar hole; the flange connecting piece is arranged on the pole hole, and the inner profile of the flange connecting piece is attached to the outer profile of the inner container; the embedded boss extends into the pole hole and is limited by the limiting step, and the outer profile of the flange flanging is tangent to the outer profile of the inner container; the outer structure composite layer is coated on the flange flanging and the inner container which is not covered by the flange flanging.
6. The composite high pressure vessel of claim 5, wherein the height h2 of the boss is the same as the thickness of the liner at the location of the pole hole.
7. The composite high pressure vessel of claim 5, wherein the thickness of the tangent point between the flange edge and the outer profile of the inner container is no more than 0.4 mm.
8. The composite high-pressure vessel of claim 5, wherein the overall height H of the flange connector is greater than or equal to H1+ H2+ H3, wherein H1 is the thickness of the flange at the connection with the flange body, H2 is the height of the embedded boss, and H3 is the thickness of the outer structural composite layer.
9. A method for forming a composite high-pressure vessel according to any one of claims 5 to 8, comprising the steps of:
1) forming a flange connecting piece and forming an inner container;
2) the inner container is bonded and formed with the flange connecting piece; mounting the flange connecting piece on the liner, ensuring that the embedded boss extends into the polar hole and is limited by the limiting step, and bonding and fixing the flange connecting piece and the liner by using a bonding tool and bonding glue solution;
3) winding and forming an outer structure composite layer; forming an outer structure composite layer in a fiber winding mode so that the outer structure composite layer is coated on the flange flanging and the liner which is not covered by the flange flanging;
4) and curing and forming to obtain the composite high-pressure container.
10. The molding method according to claim 9, further comprising, before the curing molding, potting a gap between the outer structural composite layer and the flange connection with an epoxy resin or a liquid rubber.
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