CN212745962U - Inward turning type high hydrogen resistant plastic-metal end socket structure - Google Patents
Inward turning type high hydrogen resistant plastic-metal end socket structure Download PDFInfo
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- CN212745962U CN212745962U CN202021451880.1U CN202021451880U CN212745962U CN 212745962 U CN212745962 U CN 212745962U CN 202021451880 U CN202021451880 U CN 202021451880U CN 212745962 U CN212745962 U CN 212745962U
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- 239000002184 metal Substances 0.000 title claims abstract description 95
- 239000001257 hydrogen Substances 0.000 title claims abstract description 44
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 44
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229920003023 plastic Polymers 0.000 claims abstract description 57
- 239000004033 plastic Substances 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000007704 transition Effects 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 238000009832 plasma treatment Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002991 molded plastic Substances 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 abstract description 23
- 238000003860 storage Methods 0.000 abstract description 18
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 239000002861 polymer material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 241000826860 Trapezium Species 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
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Abstract
The invention provides an inward-turning high-hydrogen-resistance plastic-metal end socket structure which comprises a metal BOSS structure and a plastic end socket. The metal BOSS structure is umbrella-shaped and is coaxially arranged with the end socket, and a plurality of rotation stopping grooves are formed in the umbrella-shaped structure and used for preventing the metal BOSS structure and the inner container end socket from rotating. The structure of the bottle mouth of the plastic sealing head is turned inwards, the conical surface of the inner ring can realize the micro sliding of the plastic and the metal by utilizing the pressure in the gas bottle when the plastic and the metal are not tightly combined, so that the plastic and the metal are tightly jointed again, and the interface is tightly jointed when the pressure is higher. The inner ring cylindrical surface parallel to the axis on the metal BOSS structure is provided with a blocking groove. The invention adopts the design of the inward-turning type plastic end socket bottle mouth, so that the plastic end socket has better deformation resistance in the rapid inflation and deflation process; the design of the structures such as the conical surface and the blocking groove fully utilizes the advantage of large pressure difference inside and outside the hydrogen storage tank, so that the plastic-metal has good interface sealing effect even if the plastic-metal shrinks inconsistently due to the processing technology and the temperature.
Description
Technical Field
The invention relates to the field of high-pressure hydrogen storage and high polymer material processing and forming, in particular to an inward-turning high-hydrogen-resistance plastic-metal end socket structure.
Background
The hydrogen becomes an important component of new energy industry due to the advantages of high combustion cleanliness and high energy density of the hydrogen, wherein the cylinder hydrogen storage technology is an important part for developing new hydrogen energy. The gas cylinder hydrogen storage technology is most widely applied to new energy automobiles, tube bundle hydrogen storage vehicles and the like. At present, the gas cylinder hydrogen storage technology is developing towards high-pressure high-density hydrogen storage, and the most advanced hydrogen storage cylinder is a type IV high-molecular composite hydrogen storage cylinder. Hydrogen has the characteristics of small molecules and easy leakage, most of the existing gas transmission pipelines are made of metal materials, and if a plastic BOSS structure is adopted, the plastic BOSS structure is easy to wear and lose efficacy due to different hardness, so that one of the technical difficulties faced by the high polymer composite hydrogen storage bottle is the high-strength and high-barrier connection technology of the end socket metal BOSS structure and the high polymer materials. Aiming at the requirement of a high-pressure large-capacity tube bundle hydrogen storage bottle with the pressure of more than 50MPa, the seal head structure of the pressure-resistant high-barrier plastic inner container is urgently developed. The BOSS structure refers to a connection structure with a BOSS.
The existing plastic hydrogen storage bottle has various sealing head structures, wherein patent 201510440522.8 uses interference fit and labyrinth seal, the metal part at the bottle mouth is larger, and the light weight effect is poorer; patent 201710086665.2 uses a labyrinth seal structure, but the structural strength has a drawback when applied to high pressure hydrogen storage; patent 201711379446.X and patent 201711379426.6 both strengthen the structure of the plastic liner at the end socket; patent 201910439016.5 uses a double sealing ring for sealing, which has a better sealing effect, but the bottle mouth does not structurally reinforce the plastic liner, and the end socket of the plastic liner is easily damaged when the bottle mouth is axially impacted; patent 201920773836.3 adopts labyrinth seal and screw thread seal, and strengthens the plastic liner structure of the bottle mouth, and has better bottle mouth strength; patent 201720862795.X adopts a labyrinth seal structure, but the bottle mouth structure is complex and is not easy to process; patent 2017109756818.3 adopts a conical surface thread seal and a labyrinth seal, which have good sealing effect, but also have the problem of complex structure and the like. An inward-turning type inner container end socket is also developed by Hexagon composite material company in Norway, but the inward-turning structure is a straight edge, and hydrogen can gradually cause hydrogen embrittlement or leakage of a contact surface.
Disclosure of Invention
The invention takes a plastic inner container for a high-capacity high-pressure hydrogen storage bottle as an object, designs an inward-turning high-hydrogen-resistance plastic-metal end socket structure, and solves the problems that high-pressure hydrogen storage is easy to leak and rapid hydrogen charging and discharging are easy to deform. Compared with the traditional plastic liner end socket structure for the high-pressure hydrogen storage bottle, the plastic liner end socket structure has the advantages of simple structure, good sealing effect and strong high-low pressure applicability, and improves the deformation resistance of the plastic end socket to rapid inflation and deflation and the environmental temperature change resistance.
The inverted high hydrogen resistant plastic-metal end socket structure comprises a metal BOSS structure and a plastic end socket. The plastic end socket is of a main body structure, and the metal BOSS structure is an insert. The metal BOSS structure is umbrella-shaped and is coaxially arranged with the end socket, an inner ring of the metal BOSS structure is embedded into the plastic end socket, and the umbrella-shaped structure covers the bottleneck of the end socket and is used for protecting the bottleneck of the end socket; meanwhile, the outer end face of the umbrella-shaped structure is superposed with the outer surface of the plastic seal head. The umbrella-shaped structure is provided with a plurality of rotation stopping grooves for preventing the metal BOSS structure and the liner sealing head from rotating. The bottle mouth of the plastic end closure is internally folded so as to enable the plastic-metal to be contacted more tightly under high pressure. The contact interface of the metal BOSS structure and the inner flanging of the end socket comprises an inner annular conical surface along the axial direction, the sectional area of the inner annular conical surface is gradually increased from the inside of the gas cylinder to the outside on the metal BOSS structure, and a section of cylindrical surface is outwards designed at the maximum section of the inner annular conical surface. The inner ring conical surface can realize micro-sliding of plastic and metal by utilizing the pressure in the gas cylinder when the plastic-metal combination is not tight, so that the plastic and the metal are tightly attached again, and the interface is attached more tightly when the pressure is higher. Meanwhile, the inner ring cylindrical surface parallel to the axis on the metal BOSS structure is provided with a blocking groove. The blocking groove deflects towards the interior of the gas cylinder, and the groove depth is at least 1.5 times the groove width. The blocking groove can be an inclined straight groove or a curved groove. The number of the blocking grooves is at least two, and the distance between the adjacent blocking grooves is larger than twice the groove width. The blocking groove deflects inwards, the length-width ratio is large, the elasticity is good, when gas leaks from the lower interface, the high polymer material in the blocking groove can be pushed to the upper interface by the gas, so that the high polymer material is tightly attached to the upper interface, and a good blocking effect is achieved. Meanwhile, the blocking groove structure has a labyrinth sealing function.
The specific forming mode of the inverted high-hydrogen-resistance plastic-metal end enclosure structure is as follows: and casting or material reducing manufacturing and molding the metal BOSS structure according to a designed structural form, then placing the finished product BOSS structure as an insert into an injection mold, and molding a plastic end enclosure in a mold cavity through injection molding to obtain the inverted high-hydrogen-resistance plastic-metal end enclosure structure.
Preferably, the metal BOSS structure and the bottle mouth of the plastic end closure are provided with a BOSS perpendicular to the axis, the outer ring surface of the BOSS is superposed with the outer ring surface of the bottle mouth of the plastic end closure, and the BOSS is contacted with the bottle mouth plane of the plastic end closure to form a BOSS plane. The boss plane may be used to increase the leakage resistance of the gas. The lug BOSS plane can be tightly attached to the mouth of the plastic seal head at low pressure, and the plastic seal head mouth can be separated possibly because of micro sliding relative to the inner ring of the metal BOSS structure at high pressure without affecting the total blocking effect.
Preferably, in the present invention, a trapezoidal groove parallel to the axis is formed inside the boss plane, an inner annular surface of the trapezoidal groove is parallel to the axis, and an outer annular surface is parallel to the inner annular tapered surface. The trapezoidal groove can increase gas leakage resistance, and prevent the bottle mouth of the plastic seal head from being separated from the metal BOSS structure perpendicular to the axis.
Preferably, the trapezoidal groove and the boss plane can be combined into a boss conical surface, the boss conical surface is designed from inside to outside in an inclined manner, and the conical surface and the inner ring conical surface are preferably in fillet transition; direct acute angle transitions are also possible, but are detrimental to structural strength.
Preferably, in the umbrella-shaped structure of the metal BOSS structure, shot blasting, plasma treatment, electrochemical treatment and the like can be carried out on the plane of the umbrella-shaped structure of the metal BOSS structure to form micro pores, so that the injection molding plastic and the metal can form an anchor target effect, and the separation of the liner end socket and the metal in the rapid deflation process is prevented.
Preferably, the plane of the umbrella-shaped structure can be designed into an umbrella-shaped structure conical surface or an arc surface with a high center and a low outer side, and the umbrella-shaped structure conical surface and the inner ring cylindrical surface of the metal BOSS structure are in fillet transition. The structure not only can play a better interface sealing effect, but also can effectively distribute load and stress compared with a plane, and reduce the possibility of deformation of the bottleneck of the plastic sealing head; meanwhile, the conical surface of the umbrella-shaped structure can replace part of metal in the metal BOSS structure with plastic, so that the weight is reduced. As a second preferred variant, the plane of the umbrella-shaped structure is designed as a trapezium structure.
The rotation stopping groove can be arranged at the edge of the umbrella-shaped structure or in the umbrella-shaped structure.
The inward-turning high-hydrogen-resistance plastic-metal end socket structure fully considers the influence of a processing technology, storage pressure and temperature on material deformation. The invention adopts the inward-turning type seal head bottle mouth design and the plastic-metal interface reinforcing structure, so that the plastic seal head has better deformation resistance in the rapid inflation and deflation process; meanwhile, the invention designs structures such as a conical surface and a blocking groove, and fully utilizes the advantage of large pressure difference inside and outside the hydrogen storage tank, so that the plastic-metal has better interface sealing effect even if the plastic-metal shrinks inconsistently due to the processing technology and temperature.
Drawings
FIG. 1 is a schematic structural diagram of a simple structure of an inverted high hydrogen resistant plastic-metal end enclosure;
FIG. 2 is a schematic view of an inverted high hydrogen resistant plastic-metal end enclosure structure rotation stopping structure;
FIG. 3 is a schematic diagram of a preferred structural scheme of an inverted high hydrogen resistant plastic-metal end enclosure structure;
FIG. 4 is a schematic diagram of a second preferred structural scheme of an inverted high hydrogen resistant plastic-metal end enclosure structure;
FIG. 5 is a schematic diagram of a simple structure of an inverted high hydrogen resistant plastic-metal end socket structure with a boss;
FIG. 6 is a schematic structural view of an inward-turning high hydrogen resistant plastic-metal end enclosure structure barrier groove;
fig. 7 is a structural schematic diagram of a boss of an inverted high hydrogen resistant plastic-metal end enclosure structure.
In the figure: 1-metal BOSS structure; 2-sealing the plastic liner; 1-1-inner ring conical surface; 1-2-barrier groove; 1-3-boss conical surface; 1-4 umbrella-shaped structure conical surfaces; 1-5-ladder structure; 1-6-boss plane; 1-7-trapezoidal grooves; 1-8-umbrella structure plane; 1-2-1-oblique straight groove; 1-2-2-curved groove.
Detailed Description
The inverted high hydrogen resistant plastic-metal end socket structure comprises a metal BOSS structure 1 and a plastic end socket 2, and is shown in figure 1. The plastic seal head 2 is of a main body structure, and the metal BOSS structure 1 is an insert. The metal BOSS structure 1 is umbrella-shaped and is coaxially arranged with the end enclosure 2, an inner ring of the metal BOSS structure is embedded into the plastic end enclosure 2, and the umbrella-shaped structure covers the bottleneck of the end enclosure; meanwhile, the outer end face of the umbrella-shaped structure is superposed with the outer surface of the plastic seal head 2. The umbrella-shaped structure is provided with a plurality of rotation stopping grooves, as shown in fig. 2, for preventing the metal BOSS structure 1 and the inner container end enclosure 2 from rotating. The bottleneck structure of the plastic end socket 2 is turned inwards. The contact interface of the metal BOSS structure 1 and the inner flanging of the end socket 2 comprises an inner annular conical surface 1-1 along the axial direction, as shown in figure 3, the sectional area of the inner annular conical surface 1-1 on the metal BOSS structure 1 is gradually increased from the inside of the gas cylinder to the outside, and a section of cylindrical surface is designed outwards at the maximum section of the inner annular conical surface 1-1. Meanwhile, the inner ring cylindrical surface parallel to the axis on the metal BOSS structure 1 is provided with a blocking groove 1-2. The blocking groove 1-2 deflects towards the interior of the gas cylinder, and the groove depth is at least 1.5 times the groove width. As shown in fig. 5, the blocking groove 1-2 may be a straight inclined groove 1-2-1, see fig. 6(a), or may be a curved groove 1-2-2, see fig. 6 (b). The number of the blocking grooves 1-2 is at least two, and the distance between the adjacent blocking grooves is larger than twice the groove width. The blocking groove 1-2 deflects inwards, has a large length-width ratio and good elasticity, and when gas leaks from the lower interface, the high polymer material in the blocking groove can be pushed to the upper interface by the gas, so that the high polymer material is tightly attached to the upper interface, and a good blocking effect is achieved. Meanwhile, the structure of the blocking groove 1-2 has a labyrinth sealing function.
The specific forming mode of the inverted high-hydrogen-resistance plastic-metal end enclosure structure is as follows: the metal BOSS structure 1 is cast or manufactured and molded by material reduction according to a designed structural form, then the finished metal BOSS structure 1 is placed into an injection mold as an insert, and a plastic seal head 2 is molded in a mold cavity through injection molding to obtain the inverted high hydrogen resistant plastic-metal seal head structure.
Preferably, as shown in fig. 5, a BOSS perpendicular to the axis is designed at the bottle mouth of the metal BOSS structure 1 and the plastic end socket 2, the outer ring surface of the BOSS coincides with the outer ring surface of the bottle mouth of the plastic end socket 2, and the BOSS is in contact with the bottle mouth plane of the plastic end socket 2 to form a BOSS plane 1-6. The boss planes 1-6 may be used to increase the leakage resistance of the gas. The BOSS planes 1-6 can be tightly attached to the bottle mouth of the plastic seal head 2 at low pressure, and the bottle mouth of the plastic seal head 2 can be separated possibly because of micro sliding relative to the inner ring of the metal BOSS structure 1 at high pressure, but the total blocking effect is not influenced.
Preferably, as shown in fig. 7, trapezoidal grooves 1-7 parallel to the axis are formed on the inner sides of the boss planes 1-6 in the present invention, as shown in fig. 7(a), inner annular surfaces of the trapezoidal grooves 1-7 are parallel to the axis, and outer annular surfaces are parallel to the inner annular conical surface 1-1. The trapezoidal grooves 1-7 can increase gas leakage resistance and prevent the bottle mouth of the plastic seal head 2 from being separated from the metal BOSS structure 1 perpendicular to the axis.
Preferably, the trapezoidal grooves 1-7 and the boss planes 1-6 can be combined into boss conical surfaces 1-3, see fig. 7(b), the boss conical surfaces 1-3 are designed from inside to outside and obliquely upwards, and the boss conical surfaces 1-3 and the inner ring conical surfaces 1-1 are preferably in fillet transition, see fig. 7 (c); direct acute angle transitions are also possible, but are detrimental to structural strength.
Preferably, the umbrella structure of the BOSS structure of the present invention may be subjected to shot blasting, plasma treatment, electrochemical treatment, etc. on the umbrella structure plane 1-8 (see fig. 5) of the metal BOSS structure 1 to form micro pores, so that the injection-molded plastic may form an anchor target effect with the metal to prevent the separation of the liner end socket from the metal during the rapid deflation process.
Preferably, as shown in fig. 3, the umbrella-shaped structure plane 1-8 can be designed as an umbrella-shaped structure conical surface 1-4 or an arc surface with a high center and a low outer side, and a fillet transition is adopted between the umbrella-shaped structure conical surface 1-4 and the inner ring cylindrical surface of the metal BOSS structure 1. The umbrella-shaped structure conical surface 1-4 of the structure not only can play a better interface sealing effect, but also can effectively distribute the load and stress compared with the boss plane 1-6, and reduce the possibility of deformation of the bottleneck of the plastic end socket 2; meanwhile, the umbrella-shaped structure conical surface 1-4 can replace part of metal in the BOSS structure 1 with plastic, so that the weight is reduced. As a second preferred variant, the plane of the umbrella-like structure 1-8 is designed as a trapezium structure 1-5, as shown in figure 4.
Claims (8)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021451880.1U CN212745962U (en) | 2020-07-22 | 2020-07-22 | Inward turning type high hydrogen resistant plastic-metal end socket structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021451880.1U CN212745962U (en) | 2020-07-22 | 2020-07-22 | Inward turning type high hydrogen resistant plastic-metal end socket structure |
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| CN212745962U true CN212745962U (en) | 2021-03-19 |
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| CN202021451880.1U Active CN212745962U (en) | 2020-07-22 | 2020-07-22 | Inward turning type high hydrogen resistant plastic-metal end socket structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750264A (en) * | 2020-07-22 | 2020-10-09 | 北京化工大学 | Inverted high resistance hydrogen plastic-metal head structure |
| CN115405849A (en) * | 2022-08-12 | 2022-11-29 | 佛山仙湖实验室 | A type IV hydrogen storage cylinder end sealing structure and preparation method thereof |
-
2020
- 2020-07-22 CN CN202021451880.1U patent/CN212745962U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750264A (en) * | 2020-07-22 | 2020-10-09 | 北京化工大学 | Inverted high resistance hydrogen plastic-metal head structure |
| CN115405849A (en) * | 2022-08-12 | 2022-11-29 | 佛山仙湖实验室 | A type IV hydrogen storage cylinder end sealing structure and preparation method thereof |
| CN115405849B (en) * | 2022-08-12 | 2024-05-28 | 佛山仙湖实验室 | IV-type hydrogen storage cylinder end sealing structure and preparation method thereof |
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