CN115405849B - IV-type hydrogen storage cylinder end sealing structure and preparation method thereof - Google Patents
IV-type hydrogen storage cylinder end sealing structure and preparation method thereof Download PDFInfo
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- CN115405849B CN115405849B CN202210966712.3A CN202210966712A CN115405849B CN 115405849 B CN115405849 B CN 115405849B CN 202210966712 A CN202210966712 A CN 202210966712A CN 115405849 B CN115405849 B CN 115405849B
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- bottle mouth
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- 238000007789 sealing Methods 0.000 title claims abstract description 53
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 25
- 239000001257 hydrogen Substances 0.000 title claims abstract description 25
- 238000003860 storage Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 93
- 239000002184 metal Substances 0.000 claims abstract description 93
- 229920003023 plastic Polymers 0.000 claims abstract description 52
- 239000004033 plastic Substances 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 31
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 229920001903 high density polyethylene Polymers 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 12
- 238000001746 injection moulding Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000001175 rotational moulding Methods 0.000 claims description 3
- 238000010146 3D printing Methods 0.000 claims description 2
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229920000800 acrylic rubber Polymers 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000000071 blow moulding Methods 0.000 claims description 2
- 229920005549 butyl rubber Polymers 0.000 claims description 2
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 229920001973 fluoroelastomer Polymers 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 229910052770 Uranium Inorganic materials 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
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
- F17C1/16—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
- F17C13/06—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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
-
- 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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
-
- 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
The invention relates to an end sealing structure of an IV-type hydrogen storage cylinder and a preparation method thereof. The sealing structure mainly comprises a metal inner bottle opening, a metal outer bottle opening, a plastic inner container and a plurality of sealing rings, wherein the metal inner bottle opening is embedded in the plastic inner container in an integrated forming mode, the metal outer bottle opening is fixed with the metal inner bottle opening through threads and is clung to the plastic inner container, the sealing rings are sleeved in an annular groove between the metal outer bottle opening and the plastic inner container and are tightly pressed by the metal outer bottle opening, and therefore reinforcement and sealing of the end part of the gas cylinder inner container are achieved. In addition, by arranging the notch and the groove at the specific part of the metal inner bottle mouth, the connection reliability between the metal inner bottle mouth and the plastic inner container is enhanced, and the molding quality of the transition part of the metal inner bottle mouth and the plastic inner container is greatly improved. Compared with the existing similar products, the gas cylinder provided by the invention has the advantages of simple structure, fewer parts, easiness in assembly and the like, and the overall safety, reliability and durability of the gas cylinder are obviously improved, so that the gas cylinder has better market competitiveness.
Description
Technical Field
The invention relates to the technical field of pressure vessels and hydrogen energy sources, in particular to an end sealing structure of an IV-type hydrogen storage cylinder and a preparation method thereof.
Background
The hydrogen storage technology is the key for developing new energy automobiles. The development and application technology of the traditional III-type gas cylinder with the metal lining are mature in China, however, the gas cylinder has the defects of obvious hydrogen embrittlement effect, poor fatigue performance and the like, and has great obstruction when being used as a vehicle-mounted hydrogen storage gas cylinder. In recent years, an IV-type gas cylinder with a plastic lining is gradually developed, and a feasible thought is provided for improving the hydrogen storage density, fatigue performance and hydrogen barrier performance of the vehicle-mounted gas cylinder. In order to improve the overall rigidity, the two ends of the plastic liner of the IV gas cylinder are usually provided with metal bottle mouth technology so as to meet the problem of liner fixation in the subsequent winding process. Because the materials of the metal bottle mouth and the plastic liner are obviously different, the interface connection quality of the metal bottle mouth and the plastic liner becomes a key for determining the air tightness of the air bottle. In addition, the plastic sealing head of the gas cylinder can be subjected to micro deformation in the process of inflation and deflation, so that gaps are formed between the plastic sealing head and the metal bottle mouth, the problems of hydrogen leakage and the like are easy to occur, and the problems are not solved well before the problems.
The search finds that Chinese patent CN113464832A discloses a bottle mouth structure of a gas bottle, a high-tightness hydrogen storage bottle and a manufacturing method thereof, wherein the bottle mouth sealing structure comprises a metal bottle mouth, a plastic sealing head and a fastener, the fastener comprises a connecting part and a first flange, and a sealing groove with a first sealing ring is arranged on the front end face of the first flange; the metal bottle mouth consists of a neck and a second flange, the second flange is provided with a plurality of annular grooves, and the front end of the second flange is provided with a plurality of notches; after the plastic seal heads which fill the gaps and the annular grooves and wrap the second flange and the rear section of the neck are formed through injection molding, the fasteners are screwed in the inner thread sections. In addition, the scheme also discloses a high-tightness gas storage bottle with the bottle opening structure and a manufacturing method thereof. Analysis shows that in the scheme, gas sealing is mainly realized through a sealing ring on a fastening piece, however, the fastening piece is required to be screwed in from a gas cylinder liner when being installed, and the manufacturing and assembling difficulties are increased intangibly. In addition, the technology uses an injection molding process, and two plastic sealing heads with sealing structures are required to be welded with the cylinder body, so that the technology has the defects of complicated steps, easiness in occurrence of bubbles at the welding position and the like.
Chinese patent CN113188039a discloses a plastic liner composite gas cylinder joint, which comprises a joint body and a sealing ring, wherein one end of the joint body is provided with an annular mounting groove, the mounting groove is arranged between the inner side wall and the outer side wall of the joint body, the mounting groove is used for accommodating the bottle mouth of the gas cylinder liner and is in sealing contact fixed connection with the inner side wall and the outer side wall of the bottle mouth of the gas cylinder liner, and the sealing ring is sleeved on the inner wall of the joint body. Analysis shows that the composite gas cylinder joint disclosed by the technology is complex in structure, relates to three types of installation cylinders, namely an outer installation cylinder, a middle installation cylinder and an inner installation cylinder, and has no sealing device between each installation head and a plastic liner, so that a large leakage risk exists. In addition, the technology does not disclose a specific molding process, and a certain processing difficulty is likely to exist.
Similar technologies also comprise CN215061274U, CN214405590U, CN11377592 6A and the like, and a large number of structures such as sealing rings, sealing grooves, sealing steps and the like are arranged on the sealing structures, so that the complexity of the structure, the production and manufacturing cost and the assembly difficulty are greatly increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a brand new end sealing structure of an IV-type hydrogen storage cylinder, which mainly comprises a metal outer bottle opening 1, a metal inner bottle opening 2, a plastic liner 3 and a sealing ring 4, wherein the metal outer bottle opening 1 comprises a base 1-1 and an air tap 1-2, and the metal inner bottle opening 2 comprises a base 2-1 and a hollow protruding part 2-2; the base 2-1 of the metal inner bottle opening is embedded in the plastic inner container 3, the hollow protruding portion 2-2 extends out of the end portion of the plastic inner container 3 and is communicated with the outside, the air tap 1-2 of the metal outer bottle opening is sleeved on the hollow protruding portion 2-2 of the metal inner bottle opening, the base 1-1 of the metal outer bottle opening is tightly attached to the outer surface of the plastic inner container 3, and the sealing ring 4 is fixed between the metal outer bottle opening 1 and the plastic inner container 3.
Further, the arc surface shape of the base 2-1 of the metal inner bottle mouth and the arc surface shape of the base 1-1 of the metal outer bottle mouth are matched with the end surface shape of the plastic inner container 3, the upper surface and the lower surface of the base 2-1 are completely embedded in the plastic inner container 3, and the diameter of the base 2-1 is equivalent to 10% -60% of the diameter of the plastic inner container.
Further, threads matched with each other are arranged on the inner surface of the air tap 1-2 of the metal outer bottle mouth and the outer surface of the hollow protruding part 2-2 of the metal inner bottle mouth, and the metal outer bottle mouth 1 and the metal inner bottle mouth 2 are fixedly and hermetically connected through the threads.
Further, a groove 2-3 and a notch 2-4 which are coaxial are arranged on the base 2-1 of the metal inner bottle mouth along the circumference. The structures such as grooves and notches on the metal inner bottle mouth can be filled with molten plastic when the plastic inner container is injection molded, so that the metal inner bottle mouth 2 is firmly embedded into the plastic inner container 3, and the bonding strength and reliability of the metal inner bottle mouth and the plastic inner container are improved.
Further, the grooves 2-3 are provided on the bottom surface of the metal inner bottle neck base 2-1, and the number thereof is 1-5. The grooves 2-3 are intermittent or continuous, preferably intermittent.
Furthermore, the notches 2-4 are equidistantly and intermittently distributed on the edge of the metal inner bottle mouth base 2-1, and the number of the notches is 2-10.
Further, an annular groove 1-3 is formed in the bottom surface of the base 1-1 of the metal outer bottle opening, a matched annular groove is formed in the outer surface of the end part of the plastic inner container 3, and a sealing ring 4 is fixed in the annular grooves in the metal outer bottle opening 1 and the plastic inner container 3, so that sealing between the metal outer bottle opening and the plastic inner container 3 is achieved.
Further, the number of the sealing rings is 1-5.
Further, the materials of the metal outer bottle mouth 1 and the metal inner bottle mouth 2 are selected from any one of iron, steel, aluminum or alloy thereof, the material of the plastic inner container 3 is selected from any one of polypropylene (PP), polyethylene (PE), nylon (PA) and other general plastics or engineering plastics, the material of the sealing ring is selected from any one of butyl rubber, silicone rubber, fluororubber, ethylene propylene diene monomer rubber, chloroprene rubber, acrylic rubber, natural rubber and polyurethane rubber, and the section shape of the sealing ring is any one of rectangle, V-shape, U-shape, O-shape and Y-shape.
The invention also aims to provide a preparation method of the end sealing structure of the IV-type hydrogen storage cylinder, which comprises the following steps: (a) Firstly, fixing a metal inner bottle opening 2 in a mould, and processing and forming to obtain a plastic inner container 3 embedded with the metal inner bottle opening; (b) The sealing ring 4 is clamped into an annular groove on the outer surface of the end part of the plastic inner container 3, and then the metal outer bottle mouth 1 is aligned with the metal inner bottle mouth 2 and screwed tightly.
Further, the molding process of the plastic liner 3 is selected from any one of blow molding, injection molding, rotational molding and 3D printing molding, and the plastic particles for molding are required to be sufficiently dried at 55-65 ℃ before being used, so that the defects of holes and the like of the plastic liner caused by water vapor generated during injection molding are prevented.
A third object of the present invention is to provide a type iv hydrogen storage cylinder having the above end seal structure mounted thereon.
The invention makes a series of improvements on the end sealing structure of the existing gas cylinder, and mainly comprises the following points:
(1) In order to improve the embedded bonding strength and reliability of the metal inner bottle mouth and the plastic inner container, the inventor respectively arranges a plurality of grooves and notches at the bottom surface and the edge part of the metal inner bottle mouth, and the unique designs ensure the mechanical property of the integrally formed plastic inner container, in addition, the grooves and notches not only obviously increase the gas seepage path to improve the air tightness of the air bottle, but also effectively solve the problem of fixing the plastic inner container in the winding process, and can prevent the relative sliding between the metal inner bottle mouth and the plastic inner container;
(2) In order to improve the strength and reliability of the end part of the gas cylinder, the end part of the plastic inner container is provided with a metal outer bottle opening which is provided with protection, enhancement and convenient for gas circulation, and the metal outer bottle opening is fixed on the metal inner bottle opening through simple threaded connection, so that the plastic inner container is prevented from being damaged through the connection between metal pieces;
(3) In order to prevent gas leakage caused by plastic deformation during inflation and deflation, an annular sealing ring is additionally arranged between the contact surface of the metal outer bottle mouth and the plastic liner, so that the safety and reliability of the gas cylinder are greatly improved.
Compared with the existing similar gas cylinder products, the gas cylinder manufactured by the method has the advantages of simple structure, easiness in production and assembly, high efficiency and the like, the defects of bubbles and the like caused by secondary welding are avoided, and the overall safety, reliability and durability of the gas cylinder are greatly improved.
Drawings
FIG. 1 is a schematic cross-sectional view of an end of a hydrogen cylinder of the type IV of the present invention;
FIG. 2 is a schematic perspective view of a metal outer finish of the present invention;
FIG. 3 is a schematic perspective view in cross-section of a metal inner neck finish of the present invention;
FIG. 4 is a schematic view of the seal ring of the present invention;
Fig. 5 is a schematic perspective view of a plastic liner of the present invention in cross-section.
Wherein 1, metal outer bottleneck, 2, metal inner bottleneck, 3, plastic liner, 4, sealing washer, 1-1, base, 1-2, air cock, 1-3, annular groove, 2-1, base, 2-2, hollow protruding part, 2-3, groove, 2-4, breach.
Detailed Description
In order to make the technical scheme and the beneficial effects of the present invention fully understood by those skilled in the art, the following description is further made with reference to specific embodiments and drawings.
Example 1
A composite type IV hydrogen storage cylinder as shown in figures 1-5 is provided with special sealing structures at two ends, and the sealing structures at the left end and the right end are the same. In some embodiments, such a seal may be provided at only one end of the cylinder. To further illustrate the problem, a detailed description will be given below taking either end of the cylinder (e.g., the left end) as an example.
The whole plastic liner 3 is connected with two metal outer bottle openings 1, metal inner bottle openings 2 and a plurality of sealing rings 4 which are similar in shape and structure, wherein the metal inner bottle openings 2 are prefabricated and formed at the end part of the plastic liner 3 in advance, and the metal outer bottle openings 1 and the sealing rings 4 are fixed on the plastic liner in the later period. The inner surface of the air tap 1-2 of the metal outer bottle mouth is provided with threads, the outer surface of the hollow bulge part 2-2 of the metal inner bottle mouth 2 similar to the air tap is provided with matched threads, and the metal inner bottle mouth and the metal outer bottle mouth are fixedly connected together through the threads. The bottom surface of the circular base 1-1 of the metal outer bottle opening 1 is provided with annular grooves 1-3, the outer surface of the end part of the plastic inner container 3 is provided with annular grooves with the same shape and number, and the sealing ring 4 is fixed in the annular grooves and is pressed by the metal outer bottle opening 1. After the metal outer bottle mouth 1 is installed in place, the intersecting or contact part of the metal outer bottle mouth 1 and the plastic inner container 3 is in smooth transition, and no step or groove exists.
In another preferred embodiment of the invention, a plurality of notches 2-4 are uniformly distributed on the edge of a base 2-1 of the plastic inner bottle mouth at a certain distance, and a plurality of discontinuous (or continuous) grooves 2-3 are arranged on the bottom surface of the base 2-1. The design can avoid the problems of relative sliding and dislocation between the metal inner bottle mouth and the plastic inner container 3 during molding, improves the reliability of combination of the metal inner bottle mouth and the plastic inner container, and also solves the problem of inner container fixation during carbon fiber winding in the later period.
In order to ensure the quality of gas cylinder products, the following preparation process is formed after research and development and optimization:
① Pretreatment of raw materials: placing the granular high-density polyethylene resin raw material into a baking oven, heating to 60+/-2 ℃ and baking for 1+/-0.2 hours so as to remove water as much as possible, and putting the dried resin into a hopper for standby.
② Injection molding of the plastic liner: fixing the metal outer bottle mouth 1 at a corresponding position of a die, starting a rotational molding machine, injecting molten plastic into a die cavity, fully filling all grooves, gaps and the die cavity of the metal inner bottle mouth 2, and cooling and demolding to obtain a left half inner container; and forming the right half inner container according to the same method, and welding the left inner container and the right inner container together to obtain the complete gas cylinder inner container. The welding mode can adopt ultrasonic welding, friction welding, hot plate welding and the like.
③ Assembling a plastic inner container: the sealing ring 4 made of rubber is plugged into the annular groove on the outer surface of the end part of the semi-finished product of the plastic liner prepared in the previous step in advance, then the metal outer bottle mouth 1 is aligned with the metal inner bottle mouth 2, and then the metal outer bottle mouth 1 is rotated to be screwed on the metal inner bottle mouth 2, so that the assembly is completed.
Claims (10)
1. An IV type hydrogen storage cylinder end seal structure which characterized in that: the sealing structure comprises a metal outer bottle opening (1), a metal inner bottle opening (2), a plastic liner (3) and a sealing ring (4), wherein the metal outer bottle opening (1) comprises a base (1-1) and an air nozzle (1-2), the metal inner bottle opening (2) comprises a base (2-1) and a hollow protruding part (2-2), coaxial grooves (2-3) and notches (2-4) are formed in the base (2-1) along the circumference, the grooves (2-3) are formed in the bottom surface of the base (2-1), and the notches (2-4) are distributed at the edge of the base (2-1) at equal intervals; the cambered surface shape of the base (2-1) and the base (1-1) are matched with the end surface shape of the plastic liner (3), the base (2-1) is pre-embedded in the plastic liner (3) and the upper surface and the lower surface of the base are completely embedded in the plastic liner (3), the hollow protruding portion (2-2) protrudes from the end portion of the plastic liner (3) and is communicated with the outside, the air tap (1-2) is sleeved on the hollow protruding portion (2-2) and the base (1-1) is tightly attached to the outer surface of the plastic liner (3), and the sealing ring (4) is fixed between the metal outer bottle mouth (1) and the plastic liner (3).
2. The end seal structure of a type iv hydrogen storage cylinder as claimed in claim 1, wherein: the diameter of the base (2-1) is equivalent to 10% -60% of the diameter of the plastic liner (3).
3. The end seal structure of a type iv hydrogen storage cylinder as claimed in claim 1, wherein: the inner surface of the air tap (1-2) and the outer surface of the hollow bulge (2-2) are provided with mutually matched threads, and the metal outer bottle mouth (1) is fixedly connected with the metal inner bottle mouth (2) through the threads.
4. The end seal structure of a type iv hydrogen storage cylinder as claimed in claim 1, wherein: the number of the grooves (2-3) is 1-5, and the grooves (2-3) are intermittent or continuous; the number of the notches (2-4) is 2-10.
5. The end seal structure of a type iv hydrogen storage cylinder as claimed in claim 1, wherein: an annular groove (1-3) is formed in the bottom surface of the base (1-1), a matched annular groove is formed in the outer surface of the end part of the plastic inner container (3), and a sealing ring (4) is fixed in the annular grooves on the metal outer bottle mouth (1) and the plastic inner container (3).
6. The end seal structure of a type iv hydrogen storage cylinder as claimed in claim 1, wherein: the metal outer bottle mouth (1) and the metal inner bottle mouth (2) are made of any one of iron, steel, aluminum or alloy thereof, the plastic inner container (3) is made of any one of PP, PE, PA and other general plastics or engineering plastics, the sealing ring is made of any one of butyl rubber, silicone rubber, fluororubber, ethylene propylene diene monomer rubber, chloroprene rubber, acrylic rubber, natural rubber and polyurethane rubber, and the cross section of the sealing ring is any one of rectangle, V, U, O and Y.
7. The method for preparing the end sealing structure of the type iv hydrogen storage cylinder as claimed in any one of claims 1 to 6, characterized in that the method comprises the following steps:
(a) Firstly, fixing a metal inner bottle opening (2) in a mould, and processing and forming to obtain a plastic inner container (3) embedded with the metal inner bottle opening;
(b) The sealing ring (4) is clamped into an annular groove on the outer surface of the end part of the plastic inner container (3), and then the metal outer bottle mouth (1) is aligned with the metal inner bottle mouth (2) and screwed tightly.
8. The method of claim 7, wherein: the molding process of the plastic liner (3) is selected from any one of blow molding, injection molding, rotational molding and 3D printing.
9. The method of claim 7 or 8, wherein: before use, the plastic particles for molding are dried at 55-65 ℃.
10. An iv-type hydrogen storage cylinder, which is characterized in that: the gas cylinder is provided with the end seal structure according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210966712.3A CN115405849B (en) | 2022-08-12 | 2022-08-12 | IV-type hydrogen storage cylinder end sealing structure and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210966712.3A CN115405849B (en) | 2022-08-12 | 2022-08-12 | IV-type hydrogen storage cylinder end sealing structure and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115405849A CN115405849A (en) | 2022-11-29 |
| CN115405849B true CN115405849B (en) | 2024-05-28 |
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| CN202210966712.3A Active CN115405849B (en) | 2022-08-12 | 2022-08-12 | IV-type hydrogen storage cylinder end sealing structure and preparation method thereof |
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|---|---|---|---|---|
| CN116592267B (en) * | 2023-07-17 | 2023-09-19 | 西南石油大学 | IV type hydrogen storage cylinder liner and 3D printing integrated forming preparation method thereof |
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