CN112728396A - Bottle mouth structure for high-pressure gas bottle - Google Patents
Bottle mouth structure for high-pressure gas bottle Download PDFInfo
- Publication number
- CN112728396A CN112728396A CN202110069722.2A CN202110069722A CN112728396A CN 112728396 A CN112728396 A CN 112728396A CN 202110069722 A CN202110069722 A CN 202110069722A CN 112728396 A CN112728396 A CN 112728396A
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- Prior art keywords
- bottle
- bottle mouth
- connecting piece
- inner container
- sealing groove
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- 238000007789 sealing Methods 0.000 claims abstract description 76
- 229920003023 plastic Polymers 0.000 claims abstract description 30
- 239000004033 plastic Substances 0.000 claims abstract description 30
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 19
- 239000004917 carbon fiber Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 26
- 239000007769 metal material Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 30
- 239000001257 hydrogen Substances 0.000 abstract description 30
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 25
- 238000003860 storage Methods 0.000 abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 11
- 239000007789 gas Substances 0.000 abstract description 9
- 229920001903 high density polyethylene Polymers 0.000 description 41
- 229910000838 Al alloy Inorganic materials 0.000 description 14
- 208000027418 Wounds and injury Diseases 0.000 description 11
- 238000013461 design Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 150000002431 hydrogen Chemical class 0.000 description 5
- 238000003754 machining Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 241000197194 Bulla Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 208000002352 blister Diseases 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010102 injection blow moulding Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001175 rotational moulding Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
-
- 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
- F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
-
- 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
- F17C13/04—Arrangement or mounting of valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A bottle mouth structure for a high-pressure gas bottle comprises an inner container bottle mouth and a bottle mouth connecting piece, wherein the inner container bottle mouth comprises a bottle neck and a shoulder; the neck is cylindrical, external threads are arranged on the outer side of the lower end of the neck, and internal threads are arranged on the inner side of the bottle mouth at the upper end of the neck; a first sealing groove and a second sealing groove which are adjacent up and down are arranged on the outer side of the upper end; sealing elements are arranged in the first sealing groove and the second sealing groove; the outer surface of the shoulder is provided with wire grooves which are radially and densely distributed from the center to the outside. The bottle mouth connecting piece is in a horn shape, the upper part of the bottle mouth connecting piece is a hollow cylinder, and the bottom of the bottle mouth connecting piece is a disc bottom. The outer diameter of the disc bottom is not more than the diameter of the bottle body of the plastic inner container, and the shape of the disc bottom is matched with the shape of the shoulder of the inner container; the bottle opening positioning pipe is composed of a straight pipe section and an L-shaped folded edge with a baffle at one end. The bottle mouth structure has high strength, good reliability, safety and effectiveness, and good sealing performance between the bottle mouth connecting piece and the inner container, is suitable for mounting various bottle valves, and is particularly suitable for the hydrogen storage bottle with the plastic inner container wound with carbon fiber.
Description
Technical Field
The invention belongs to a sealing structure, and relates to a bottle mouth sealing structure suitable for a high-pressure gas cylinder, in particular to a bottle mouth sealing structure suitable for a hydrogen storage bottle with a plastic inner container wound with carbon fibers.
Background
Hydrogen is used as a power source of a fuel cell automobile, and the current vehicle-mounted storage mode still adopts the high-pressure gaseous storage with the most mature technology and the most extensive application as the mainstream technology at home and abroad. The pressure grades of vehicle-mounted high-pressure hydrogen storage are 35 MPa and 70 MPa. With the continuous improvement of the manufacturing technology of the 70MPa high-pressure hydrogen storage bottle and the obvious reduction of the cost, the 70MPa vehicle-mounted hydrogen storage technology is generally adopted by fuel cell automobiles (such as passenger cars, coaches, heavy trucks and the like) with higher requirements on driving range.
The 70MPa vehicle-mounted composite hydrogen storage bottle is divided into two types, namely an aluminum liner-wound carbon fiber type (III type bottle) and a plastic liner-wound carbon fiber type (IV type bottle). Wherein, the IV type bottle is superior to the III type bottle in the aspects of weight hydrogen storage density, production efficiency, cost, light weight and the like, and is the future development direction of the vehicle-mounted hydrogen storage bottle.
The bottle mouth of the IV-type bottle needs to be reinforced in compressive strength by means of a metal structural part, and meanwhile, the IV-type bottle is easy to connect with a metal bottle valve.
When the vehicle-mounted hydrogen storage bottle is used for charging and discharging hydrogen, the pressure and the temperature inside the vehicle-mounted hydrogen storage bottle can be changed continuously. For IV-type bottles, the joint of the plastic liner and the metal structural part is easy to generate fatigue in repeated high and low temperature changes and expansion and contraction processes, so that the sealing failure of the plastic and metal connecting interface is caused and hydrogen leakage occurs. In addition, when the metal bottle valve is mounted or dismounted on the bottle mouth of the hydrogen storage bottle, the forward or reverse torque can be transmitted to the metal connecting piece of the bottle mouth, so that the metal connecting piece of the bottle mouth and the bottle neck of the plastic liner can easily rotate relatively to be loosened, and the disconnection of a plastic and metal connecting interface is caused to influence the service life of the hydrogen bottle. Therefore, in order to solve the above problems, it is objective to develop a novel bottleneck structure of a hydrogen storage bottle with a plastic liner and carbon fiber wound around the bottleneck structure, so as to improve the anti-twisting and gas leakage prevention capabilities of the bottleneck connecting piece.
Disclosure of Invention
The invention aims to provide a bottle mouth structure for a high-pressure gas bottle, in particular to a bottle mouth structure for a hydrogen storage bottle with a plastic inner container wound with carbon fibers and an implementation method thereof, which have excellent leakage resistance and torsion resistance when the plastic inner container is combined with a metal structure.
In order to achieve the above purpose, the solution of the invention is as follows:
a bottle mouth structure for a high-pressure gas bottle comprises an inner container bottle mouth and a bottle mouth connecting piece, wherein the inner container bottle mouth comprises a bottle neck and a shoulder;
the neck is cylindrical, external threads are arranged on the outer side of the lower end of the neck, and internal threads are arranged on the inner side of the bottle mouth at the upper end of the neck; a first sealing groove and a second sealing groove which are adjacent up and down are arranged on the outer side of the upper end; sealing elements are arranged in the first sealing groove and the second sealing groove;
the outer surface of the shoulder is provided with wire grooves which are radially and densely distributed from the center to the outside.
Furthermore, the bottle mouth connecting piece is in a horn shape, the upper part of the bottle mouth connecting piece is a hollow cylinder, and the bottom of the bottle mouth connecting piece is a disc bottom.
The outer diameter of the disc bottom is not more than the diameter of the bottle body of the plastic inner container, and the shape of the disc bottom is matched with the shape of the shoulder of the inner container, so that the disc bottom and the inner container are tightly attached when being overlapped; the inner diameter of the disc bottom is the same as the inner diameter of the upper cylinder.
The inner side surface of the disc bottom is provided with densely-distributed convex points which are radially and densely distributed outwards along the center.
The inner side of the lower end of the cylinder is provided with internal threads which are matched with the external threads at the lower end of the neck cylinder of the inner container; the inner side of the upper end is provided with an internal thread which is matched with an external thread of an external cylinder valve; in the cylinder, a limit retainer ring is arranged in the middle along the circumference.
The bottle opening positioning pipe is composed of a straight pipe section and an L-shaped folded edge with a baffle at one end.
The lower end of the outer side of the straight pipe section is provided with an external thread which is matched with the internal thread in the bottleneck of the liner; and a sealing groove is formed in the upper part of the outer side of the straight pipe section and used for embedding a sealing element. The outer diameter of the L-shaped folded edge is smaller than the inner diameter of the metal bottleneck connecting piece cylinder; on the folded edge, baffles which are vertical to the folded edge and fixed along the radial direction are uniformly distributed along the circumferential direction; the lower end of the baffle is connected with or separated from the bottom of the folded edge.
The disc bottom at the bottom of the bottle mouth connecting piece is superposed on the shoulder of the liner, and the shoulder of the liner and the bottom of the bottle mouth connecting piece are fastened together by spirally wound carbon fibers.
The width of the wire grooves is 0.1-1.5mm, the depth is 0.1-2mm, and the distance between adjacent wire grooves is 0.5-5 mm.
The length of the cylinder part of the neck part of the plastic liner is 20-200mm, the outer diameter of the cylinder is 20-200mm, and the wall thickness of the cylinder is 2-50 mm; and/or the length of the external thread is 5-150 mm; and/or the distance between the internal thread on the inner side of the upper-end bottle mouth and the bottle mouth is 10-100mm, and the length of the internal thread is 5-100 mm; and/or the distance between the upper sealing groove and the bottle mouth is 5-100mm, the distance between the upper sealing groove and the lower sealing groove is 3-100mm, and the width and the depth of the sealing grooves are 1-10mm and 0.5-5mm respectively.
The salient points are round salient points with the diameter of 0.05-1mm and the height of 0.1-2mm, and the distance between every two adjacent round salient points is 0.1-5 mm.
The length of the cylinder of the bottle mouth connecting piece is 25-500mm, and the length of the internal thread on the inner side of the lower end is 5-100 mm; and/or the length of the internal thread on the inner side of the upper end is 5-100 mm; and/or the distance between the limiting retainer ring and the bottom of the connecting piece is 20-300mm, and the width of the retainer ring is 3-20 mm.
The length of the straight pipe section of the positioning pipe is 20-300mm, the outer diameter is 16-196mm, and the wall thickness is 1-30 mm; and/or the length of the external thread at the lower end of the outer side is 5-100 mm; and/or the distance between the upper sealing groove and the folded edge is 5-100mm, and the width and the depth of the sealing groove are 1-10mm and 0.1-5mm respectively. The width of the L-shaped folded edge is 3-15 mm; and/or the height of the baffle is 5-50mm, and the width of the baffle is 3-15 mm.
The sealing element is an O-shaped sealing ring and a sealing retainer ring.
The inner container is made of plastic; and/or the bottle mouth connecting piece is made of a metal material.
The mounting tool of the bottle mouth positioning pipe comprises a T-shaped handle and a circular bottom, wherein the bottom of the T-shaped handle is connected with the center of the circular bottom; the diameter of the round bottom is smaller than the outer diameter of the L-shaped folded edge of the bottle mouth positioning tube. The number of the vertical baffles on the circular bottom is the same as that of the vertical baffles on the L-shaped folded edge of the positioning tube, and the vertical baffles are uniformly distributed along the circumferential direction, are vertical to the circular bottom and are fixed along the radial direction.
Rectangular openings are uniformly distributed between adjacent vertical baffles on the circular bottom, and the width and the depth of each rectangular opening are larger than those of the baffles of the positioning tube.
The height of the baffle is 5-50mm, and the width of the baffle is 5-30 mm.
Specifically, the composite material gas cylinder plastic inner container can be formed by rotational molding, injection molding, blow molding or other common plastic forming methods.
Furthermore, the plastic inner container can be in an asymmetric design with one end open and the other end sealed, and can also be in a symmetric design with two ends open.
Furthermore, shallow wire grooves which are radially distributed from the center to the outside are designed on the outer surface of the shoulder at the opening end of the plastic liner, the wire grooves can be formed simultaneously when the plastic liner is formed through the design of a plastic forming die, and the wire grooves can also be machined on the outer surface of the shoulder of the plastic liner in a machining mode after the plastic liner is formed.
The neck of the plastic liner bottle mouth is cylindrical, external threads are arranged on the outer side of the lower end of the neck, internal threads are arranged on the inner side of the upper end of the neck, the threads can be formed simultaneously with the plastic liner through the design of a die, and the threads can be machined in a machining mode after the plastic liner is formed.
And further, the outer side of the upper end of the neck of the bottle of the plastic inner container is provided with two adjacent sealing grooves, the sealing grooves can be formed simultaneously with the plastic inner container through the design of a die, and the sealing grooves can be machined in a machining mode after the plastic inner container is formed.
And further, an O-shaped sealing ring and a check ring are respectively embedded in the sealing groove of the neck part of the bottle of the plastic liner. A pair of O-shaped sealing rings and check rings are embedded in each sealing groove.
A metal finish attachment may be made by casting or machining.
Furthermore, the metal bottle mouth connecting piece is in a horn shape. The upper part is a hollow cylinder shape and is matched with the neck cylinder of the plastic liner, namely the inner diameter of the bottleneck connecting piece cylinder is matched with the outer diameter of the neck cylinder of the plastic liner. The bottom is a disc-shaped bottom which is matched with the shoulder of the plastic inner container. The outer diameter of the disk bottom of the connecting piece is smaller than or equal to the diameter of the bottle body of the plastic liner, and the radian and the shape of the disk bottom of the connecting piece are matched with the shoulder of the plastic liner, so that the disk bottom of the connecting piece and the shoulder of the plastic liner are tightly attached when the disk bottom of the connecting piece is connected. The inner diameter of the disc bottom of the connecting piece is the same as that of the upper cylinder.
Furthermore, the inner side surface of the disc bottom is designed with densely distributed micro convex points which are radially distributed outwards along the center.
Furthermore, the inner side of the lower end of the upper cylinder of the metal bottle mouth connecting piece is provided with an internal thread which is matched with the external thread at the lower end of the neck cylinder of the plastic liner. The inner side of the upper end is provided with an internal thread which is connected with an external cylinder valve. A circle of limiting retainer ring is arranged in the middle along the circumference.
Furthermore, the internal thread at the lower end of the cylinder part of the metal bottle mouth connecting piece is screwed into the external thread at the bottle mouth of the plastic liner, and the bottom disc part is tightly attached to the shoulder part of the plastic liner.
Further, the bottom disc bottom of the metal bottle opening connecting piece and the plastic inner container are tightly fixed together in a spiral winding mode when the carbon fiber is wound on the composite material gas cylinder.
A positioning tube for bottle mouth is composed of straight tube and L-shaped folded edge with baffle at one end.
Furthermore, the lower part of the outer side of the straight pipe section is provided with external threads which are matched with the internal threads in the bottleneck of the plastic liner. The upper part is provided with a sealing groove for embedding a sealing ring and a sealing check ring.
And further, the outer diameter of the L-shaped folded edge at the upper end of the straight pipe section is slightly smaller than the inner diameter of the metal bottleneck connecting piece cylinder. And vertical baffles which are vertical to the folded edge and fixed along the radial direction are uniformly distributed on the folded edge along the circumferential direction, and the lower end of each baffle is incompletely connected with the folded edge. Preferably, 1 vertical baffle is fixed at intervals of 90 degrees along the circumferential direction, is perpendicular to the L-shaped folded edge and is fixed along the radial direction.
A positioning tube mounting tool is provided, wherein a T-shaped handle is arranged in the middle, the bottom is a circular bottom, and the diameter of the circular bottom is slightly smaller than the outer diameter of a folded edge of a bottle mouth positioning tube. The number of the vertical baffles on the circular bottom is the same as that of the vertical baffles on the L-shaped folded edge of the positioning tube, and the vertical baffles are uniformly distributed along the circumferential direction, are vertical to the circular bottom and are fixed along the radial direction. Furthermore, rectangular openings are uniformly distributed between adjacent vertical baffles on the circular bottom, and the width and the depth of each rectangular opening are larger than the thickness and the depth of each positioning pipe baffle. The bottom of the T-shaped handle is connected with the center of the round bottom. When the bottle mouth positioning pipe is installed, the rectangular opening at the circular bottom of the positioning pipe installation tool is aligned to the baffle of the positioning pipe, the positioning pipe can be clamped by clockwise rotation after insertion, the positioning pipe can be sent into the metal bottle mouth connecting piece cylinder by means of the positioning pipe installation tool, and the outer thread of the positioning pipe is connected with the inner thread of the bottle mouth of the plastic liner by rotating the T-shaped handle of the installation tool.
Due to the adoption of the scheme, the invention has the beneficial effects that:
(1) the bottle mouth structure disclosed by the invention has the advantages that the shallow slot designed on the outer surface of the shoulder part of the plastic liner is matched with the micro convex point designed on the inner surface of the bottom part of the metal bottle mouth connecting piece, and the fastening force generated when carbon fibers are wound is applied, so that the convex point is tightly embedded into the slot, and the forward or reverse rotation of the metal bottle mouth connecting piece in the use process of the gas cylinder can be effectively avoided.
(2) According to the bottle mouth structure disclosed by the invention, the positioning pipe is introduced into the bottle mouth, and the positioning pipe flanging is utilized to tightly clamp the limiting retainer ring of the metal connecting piece of the bottle mouth, so that the bottle valve can be prevented from driving the metal connecting piece to rotate anticlockwise when the bottle valve is disassembled.
(3) According to the bottle mouth structure disclosed by the invention, the compressive strength of the plastic bottle mouth is enhanced from the inner side and the outer side of the plastic liner bottle mouth through the bottle mouth positioning pipe and the metal connecting piece.
(4) The bottle mouth structure disclosed by the invention adopts the inner wall of the metal bottle mouth positioning pipe with better rigidity to replace the inner wall of the plastic bottle mouth which is easy to deform as a sealing contact surface with the bottle valve sealing ring, so that the sealing effect can be improved.
(5) According to the bottle mouth structure disclosed by the invention, the sealing grooves on the outer side of the bottle mouth positioning pipe and the outer side of the plastic liner are designed and the sealing rings are used, so that the inner side and the outer side of the bottle mouth of the plastic liner are simultaneously sealed, and the best sealing effect can be realized under the working conditions of high pressure and low pressure in the bottle.
Drawings
Fig. 1 is a schematic structural view of a bottle mouth according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of the plastic liner bottle mouth in the embodiment shown in fig. 1.
Fig. 3 is a top view of the plastic liner finish of the embodiment shown in fig. 1.
FIG. 4 is a schematic view of the metal connecting piece of the bottle mouth in the embodiment shown in FIG. 1.
Figure 5 is a bottom view of the rounded bottom of the finish metal attachment of the embodiment of figure 1.
FIG. 6 is a schematic view of a mouthpiece positioning tube structure in the embodiment shown in FIG. 1.
FIG. 7 is a top view of the spout retention tube of the embodiment shown in FIG. 1.
FIG. 8 is a top view of the present invention bottle neck positioning tube installation tool.
FIG. 9 is a schematic front view of a mounting tool for a positioning tube of a bottle mouth of the present invention.
Reference numbers in the figures:
1 inner bag bottleneck, 2 bottleneck connecting pieces, 3 bottleneck registration arms, 4 carbon fiber winding layers, 5 sealing rings and retaining rings, 6 registration arm mounting tools.
101, a first sealing groove of a liner bottle opening, 102, a second sealing groove of the liner bottle opening, 103, external threads of the liner bottle opening and 104 line grooves; 105 inner container bottle mouth internal thread;
201 a first internal thread of a bottle opening connecting piece, 202 a second internal thread of the bottle opening connecting piece, 203 salient points and 204 limit retainer rings;
301, external threads of a bottleneck positioning pipe, 302, a sealing groove of the bottleneck positioning pipe, 303L-shaped folded edges and 304 baffle plates;
501 a first seal ring, 503 a second seal ring, 505 a third seal ring, 502 a first retainer ring, 504 a second retainer ring, 506 a third retainer ring;
601 disc, 602 baffle, 603T-shaped handle, 604 rectangular opening.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The invention discloses a bottleneck structure of a hydrogen storage bottle with a plastic liner and carbon fiber wound thereon, which comprises a liner bottleneck 1, a bottleneck connecting piece 2, a bottleneck positioning tube 3 and a carbon fiber wound layer 4, as shown in figure 1.
The structure of the liner bottle mouth 2 is shown in fig. 2 and 3. The inner container of this embodiment is made of nylon and is blow molded. The length of the neck cylindrical part of the inner container opening 2 is 45mm, the outer diameter is 45mm, and the wall thickness is 5 mm. When the liner is formed, through the design of a model, a first sealing groove 101 and a second sealing groove 102 which are arranged in parallel are formed at the upper end of the outer side of the bottleneck and 10mm away from the bottleneck. The width of seal groove is 3mm, and the degree of depth is 1mm, and the interval of two seal grooves is 4 mm. The lower end of the outer side of the bottleneck neck is provided with inner container bottleneck external threads 103, and the length of the threads is 15 mm. The upper end of the inner side of the neck of the inner container bottle mouth 2 is 20mm away from the bottle mouth and is provided with an internal thread 105, and the length of the internal thread is 10 mm. The bottom of the liner bottle mouth 2 (namely the shoulder of the plastic liner) is a plane vertical to the bottle neck, and the diameter of the plane is 250 mm. The outside of the plane is transited to the cylindrical bottle body through an arc surface, the plane is provided with wire slots 104 which are densely and radially distributed from the center to the outside, and the width and the height of each wire slot 104 are both 0.5mm, as shown in fig. 3. It should be noted that: the shallow slots 104 shown in figure 3 are only a portion of them, and in fact the slots 104 are radially spaced from the center to the outside in the entire plane.
The structure of the bottle mouth connector 2 is shown in fig. 4 and 5, and it can be made of stainless steel, aluminum alloy or other metal materials by casting molding or machining, and the aluminum alloy material is selected in this embodiment. The aluminum alloy is machined into the bottleneck connecting pieces 2 of the upper cylinder and the lower disc shown in figure 4, the length of the bottleneck connecting pieces is 80mm, the inner diameter of the cylinder is 45mm, and the outer diameter of the cylinder is 55 mm. The cylinder is provided with a second internal thread 202 of the bottle mouth connecting piece on the inner upper edge, the length of the thread from top to bottom is 20mm, and the cylinder is mainly used for being connected with an external thread of an external bottle valve, so that the specification of the internal thread is matched with the external thread of the bottle valve. The middle part of the cylinder is 46mm away from the bottom of the bottle mouth connecting piece 2, and a circumferential check ring 204 which protrudes along the circumference of the inner wall is processed, the width of the check ring is 4mm, and the thickness of the check ring is 3 mm. The inner diameters of the cylinders above and below the retainer ring are the same. The lower end of the cylinder is provided with a first internal thread 201 of the bottle mouth connecting piece matched with the external thread 103 of the bottleneck of the plastic liner, and the length of the thread is 20mm from the bottom to the top. The bottom of the finish attachment disk, as shown in fig. 4 and 5, is a hollow disk having an inside diameter the same as the inside diameter of the cylinder. The bottom surface of the disc is an annular plane, the outer diameter of the plane is 250mm, round convex points 203 which are radially and densely distributed from the center to the outside are processed, and the diameter and the height are both 0.3 mm. The diameter and the height of the round salient points 203 are slightly smaller than the width and the depth of the shallow slot 104 on the shoulder plane of the plastic liner, so that when the bottleneck connecting piece 2 is installed on the bottleneck of the plastic liner, the round salient points 203 on the bottom surface can be effectively embedded into the slot 104 on the shoulder of the plastic liner, and the bonding force of the two is increased.
The structure of the bottle mouth positioning pipe is schematically shown in fig. 6 and 7. The material of bottleneck registration arm adopts 316L stainless steel, and registration arm length is 30mm, and the external diameter 35mm, wall thickness 2.5 mm. Along the circumference of going up along bottleneck registration arm, welding L shape hem 303, the width of annular hem bottom is 4mm, and the height is 10 mm. On the L-shaped hem, 1 baffle 304 perpendicular to the hem is welded every 90 degrees, the width and height of the baffle 304 being 4mm and 10mm, respectively. The bottom of the baffle 304 is not connected with the bottom edge of the L-shaped folding edge 303, and the gap between the baffle 304 and the bottom edge of the L-shaped folding edge 303 is 3 mm. The outer side of the lower end of the positioning pipe is provided with an external thread 301 which is processed at a position 20mm away from the folded edge, and the length of the external thread is 10mm and is matched with the internal thread 105 of the mouth of the plastic liner bottle. A sealing groove 302 is processed on the outer side of the upper end of the bottle mouth positioning pipe, the width of the sealing groove is 3mm, and the depth of the sealing groove is 1 mm. The distance between the sealing groove and the positioning pipe folded edge is 10 mm.
The installation tool designed for installing the positioning tube is shown in fig. 8 and 9. The middle of the mounting tool is provided with a T-shaped handle 603, the bottom of the mounting tool is provided with a circular bottom 601, the diameter of the circular bottom 601 is 40mm, and the thickness of the circular bottom is 2 mm. On the circular bottom, 4 vertical baffles 602 are welded along the radial direction and perpendicular to the circular bottom, and the height and width of the baffles are respectively 10mm and 5 mm. Adjacent vertical baffles are circumferentially spaced apart by 90 degrees. Rectangular openings 604 are formed in the circular bottom between adjacent vertical baffle plates, and the adjacent rectangular openings are also spaced by 90 degrees in the circumferential direction. The rectangular opening 604 is 10mm wide and deep. The bottom of the T-shaped handle 603 is connected to the center of the circular bottom.
The invention is further described below in connection with a specific installation process of a bottleneck structure of a hydrogen storage bottle with a plastic liner wound with carbon fibers.
Modified rubber O-shaped sealing rings 503 and 505 and PTFE retaining rings 504 and 506 are respectively sleeved in the bottle mouth sealing grooves 101 and 102 of the blow-molded plastic liner 1. Can form twice between aluminum alloy connecting piece and plastics inner bag bottleneck outer wall sealed, hydrogen leads to hydrogen to leak through infiltrating into carbon fiber winding layer in the aluminum alloy connecting piece round bottom in the separation bottle, can cause the debonding or the tympanic bulla of carbon fiber and plastics inner bag when hydrogen leaks seriously, seriously influences the hydrogen bottle life-span.
The disk bottom of the aluminum alloy bottle mouth connecting piece 2 is downward and is sleeved into the bottle mouth of the plastic inner container 1. The internal thread 201 of the bottle mouth connecting piece is screwed into the external thread 103 of the bottleneck of the plastic liner until the salient point 203 on the bottom of the disk is tightly embedded with the thread groove 104 of the shoulder part of the plastic liner and is not screwed.
The tensile force of the carbon fibers when the carbon fibers of the hydrogen bottle are wound is utilized to tightly fix the aluminum alloy bottle mouth connecting piece and the plastic inner container, so that the compressive strength of the plastic inner container is increased, the conjunction force between the round salient points 203 on the disc bottom of the aluminum alloy connecting piece and the wire grooves 104 on the shoulder part of the plastic inner container is further improved, the disconnection among the plastic inner container, the aluminum alloy connecting piece and the carbon fiber winding layer caused by the rotation of the aluminum alloy connecting piece is avoided, and the fatigue life of the hydrogen bottle is further influenced.
A modified rubber O-shaped sealing ring 501 and a tetrafluoro material retaining ring 502 are sleeved in the sealing groove 302 of the bottle mouth positioning pipe 3, so that hydrogen in the hydrogen bottle can be prevented from leaking through the contact surface of the positioning pipe and the inner wall of the plastic liner. 4 rectangular openings 604 on the circular bottom of the mounting tool of the bottle mouth positioning tube are respectively aligned with 4 baffles 304 on the L-shaped folded edge of the positioning tube, and the positioning tube is inserted and then rotates clockwise, so that the circular bottom of the mounting tool can be embedded into the gap between the baffle of the positioning tube and the bottom edge of the folded edge, and the bottle mouth positioning tube 3 can be clamped. The bottle mouth positioning pipe 3 is sent into the aluminum alloy bottle mouth connecting piece by means of the mounting tool, and the T-shaped handle of the mounting tool is rotated, so that the vertical baffle on the circular bottom of the mounting tool drives the vertical baffle on the folded edge of the bottle mouth positioning pipe, the outer thread 301 of the bottle mouth positioning pipe is screwed into the inner thread 105 of the bottle mouth of the plastic liner until the bottom edge of the L-shaped folded edge 303 of the positioning pipe is blocked by the limiting retaining ring 204 of the aluminum alloy connecting piece and cannot be screwed. Therefore, the L-shaped folding edge 303 blocks the limiting check ring, so that the phenomenon that the aluminum alloy connecting piece at the bottle opening does not rotate anticlockwise under the action of external force (for example, anticlockwise torque force when the bottle valve is disassembled is transmitted to the connecting piece) can be avoided. And rotating the T-shaped handle of the mounting tool anticlockwise until the positions of the 4 rectangular openings on the circular bottom of the mounting tool are just overlapped with the baffle on the L-shaped folding edge 304 of the positioning tube, and taking out the mounting tool upwards.
After the hydrogen bottle is manufactured, when an external bottle valve needs to be installed, external threads at the head of the bottle valve are screwed into the internal threads 202 of the aluminum alloy connecting piece of the bottle opening, an O-shaped sealing ring on a cylinder at the lower end of the bottle valve is inserted into the bottle opening positioning pipe 3 and forms sealing with the inner wall of the bottle opening positioning pipe 3, namely, the installation of the bottle valve is completed, and meanwhile, three groups of sealing rings at the bottle opening of the hydrogen bottle form complete sealing of the bottle opening of the hydrogen bottle.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (13)
1. A bottleneck structure for a high-pressure gas cylinder, its characterized in that: the bottle comprises a liner bottle mouth and a bottle mouth connecting piece, wherein the liner bottle mouth comprises a bottle neck and a shoulder;
the neck is cylindrical, external threads are arranged on the outer side of the lower end of the neck, and internal threads are arranged on the inner side of the bottle mouth at the upper end of the neck; a first sealing groove and a second sealing groove which are adjacent up and down are arranged on the outer side of the upper end; sealing elements are arranged in the first sealing groove and the second sealing groove;
the outer surface of the shoulder is provided with wire grooves which are radially and densely distributed from the center to the outside.
2. A mouth structure for a high pressure gas cylinder according to claim 1, characterized in that: the bottle mouth connecting piece is in a horn shape, the upper part of the bottle mouth connecting piece is a hollow cylinder, and the bottom of the bottle mouth connecting piece is a disc bottom.
3. A mouth structure for a high-pressure gas cylinder according to claim 2, characterized in that: the outer diameter of the disc bottom is not more than the diameter of the bottle body of the plastic inner container, and the shape of the disc bottom is matched with the shape of the shoulder of the inner container, so that the disc bottom and the inner container are tightly attached when being overlapped; the inner diameter of the disc bottom is the same as that of the upper cylinder; and/or the presence of a gas in the gas,
the inner side surface of the disc bottom is provided with densely-distributed convex points which are radially and densely distributed outwards along the center; and/or the presence of a gas in the gas,
the inner side of the lower end of the cylinder is provided with internal threads which are matched with the external threads at the lower end of the neck cylinder of the inner container; the inner side of the upper end is provided with an internal thread which is matched with an external thread of an external cylinder valve; in the cylinder, a limit retainer ring is arranged in the middle along the circumference.
4. A mouth structure for a high pressure gas cylinder according to claim 1, characterized in that: the bottle opening positioning pipe is composed of a straight pipe section and an L-shaped folded edge with a baffle at one end.
5. A mouth structure for a high pressure gas cylinder according to claim 4, characterized in that: the lower end of the outer side of the straight pipe section is provided with an external thread which is matched with the internal thread in the bottleneck of the liner; the upper part of the outer side of the straight pipe section is provided with a sealing groove for embedding a sealing element; and/or the presence of a gas in the gas,
the outer diameter of the L-shaped folded edge is smaller than the inner diameter of the metal bottleneck connecting piece cylinder; on the folded edge, baffles which are vertical to the folded edge and fixed along the radial direction are uniformly distributed along the circumferential direction; the lower end of the baffle is connected with or separated from the bottom of the folded edge.
6. A mouth structure for a high pressure gas cylinder according to claim 1, characterized in that: spirally wound carbon fibers are arranged on the shoulder part of the inner container and the bottle mouth connecting piece, and the shoulder part of the inner container and the bottom part of the bottle mouth connecting piece are fastened together; and/or the presence of a gas in the gas,
the width of the wire grooves is 0.1-1.5mm, the depth is 0.1-2mm, and the distance between adjacent wire grooves is 0.5-5 mm.
7. A mouth structure for a high pressure gas cylinder according to claim 1, characterized in that: the length of the cylinder part of the neck of the bottle opening of the inner container is 20-200mm, the outer diameter of the cylinder is 20-200mm, and the wall thickness of the cylinder is 2-50 mm; and/or the length of the external thread is 5-150 mm; and/or the distance between the internal thread on the inner side of the upper-end bottle mouth and the bottle mouth is 10-100mm, and the length of the internal thread is 5-100 mm; and/or the distance between the upper sealing groove and the bottle mouth is 5-100mm, the distance between the upper sealing groove and the lower sealing groove is 3-100mm, and the width and the depth of the sealing grooves are 1-10mm and 0.5-5mm respectively.
8. A mouth structure for a high pressure gas cylinder according to claim 3, characterized in that: the salient points are round salient points with the diameter of 0.05-1mm and the height of 0.1-2mm, and the distance between every two adjacent round salient points is 0.1-5 mm; and/or the presence of a gas in the gas,
the length of the cylinder is 25-500mm, and the length of the internal thread on the inner side of the lower end is 5-100 mm; and/or the length of the internal thread on the inner side of the upper end is 5-100 mm; and/or the distance between the limiting retainer ring and the bottom of the connecting piece is 20-300mm, and the width of the retainer ring is 3-20 mm.
9. A mouth structure for a high pressure gas cylinder according to claim 4, characterized in that: the length of the straight pipe section is 20-300mm, the outer diameter is 16-196mm, and the wall thickness is 1-30 mm; and/or the length of the external thread at the lower end of the outer side is 5-100 mm; and/or, the distance between the upper sealing groove and the folded edge is 5-100mm, and the width and the depth of the sealing groove are 1-10mm and 0.1-5mm respectively; and/or the presence of a gas in the gas,
the width of the L-shaped folded edge is 3-15 mm; and/or the height of the baffle is 5-50mm, and the width of the baffle is 3-15 mm.
10. A mouth structure for a high-pressure gas cylinder according to claim 1 or 5, characterized in that: the sealing element is an O-shaped sealing ring and a sealing retainer ring; and/or the inner container is made of plastics; and/or the bottle mouth connecting piece is made of a metal material.
11. The finish positioning tube setting tool of claim 4, wherein: the T-shaped handle is connected with the center of the circular bottom; the diameter of the round bottom is smaller than the outer diameter of the L-shaped folded edge of the bottle mouth positioning tube; the number of the vertical baffles on the circular bottom is the same as that of the vertical baffles on the L-shaped folded edge of the positioning tube, and the vertical baffles are uniformly distributed along the circumferential direction, are vertical to the circular bottom and are fixed along the radial direction.
12. The finish positioning tube setting tool of claim 11, further comprising: rectangular openings are uniformly distributed between adjacent vertical baffles on the circular bottom, and the width and the depth of each rectangular opening are larger than those of the baffles of the positioning tube.
13. The finish positioning tube setting tool of claim 11, further comprising: the height of the baffle is 5-50mm, and the width of the baffle is 5-30 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110069722.2A CN112728396A (en) | 2021-01-19 | 2021-01-19 | Bottle mouth structure for high-pressure gas bottle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110069722.2A CN112728396A (en) | 2021-01-19 | 2021-01-19 | Bottle mouth structure for high-pressure gas bottle |
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| CN114719027A (en) * | 2022-03-07 | 2022-07-08 | 杭州智海人工智能有限公司 | Bottleneck valve of hydrogen storage container |
| CN115405849A (en) * | 2022-08-12 | 2022-11-29 | 佛山仙湖实验室 | IV-type hydrogen storage cylinder end sealing structure and preparation method thereof |
| CN116619769A (en) * | 2023-07-25 | 2023-08-22 | 亨弗劳恩(江苏)复合材料研发有限公司 | Bonding and fixing tool and bonding and fixing method for hydrogen storage bottle liner and bottle valve seat |
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