WO2021101239A1 - 고압탱크용 노브캡 - Google Patents
고압탱크용 노브캡 Download PDFInfo
- Publication number
- WO2021101239A1 WO2021101239A1 PCT/KR2020/016248 KR2020016248W WO2021101239A1 WO 2021101239 A1 WO2021101239 A1 WO 2021101239A1 KR 2020016248 W KR2020016248 W KR 2020016248W WO 2021101239 A1 WO2021101239 A1 WO 2021101239A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pressure tank
- knob cap
- knob
- high pressure
- cap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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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
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/06—Closures, e.g. cap, breakable member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
- F17C1/04—Protecting sheathings
- F17C1/06—Protecting sheathings built-up from wound-on bands or filamentary material, e.g. wires
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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
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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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0602—Wall structures; Special features thereof
- F17C2203/0604—Liners
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0602—Wall structures; Special features thereof
- F17C2203/0612—Wall structures
- F17C2203/0614—Single wall
- F17C2203/0619—Single wall with two layers
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
- F17C2203/0646—Aluminium
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0658—Synthetics
- F17C2203/066—Plastics
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0658—Synthetics
- F17C2203/0663—Synthetics in form of fibers or filaments
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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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0305—Bosses, e.g. boss collars
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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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0308—Protective caps
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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
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/21—Shaping processes
- F17C2209/2154—Winding
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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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
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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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
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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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/035—Propane butane, e.g. LPG, GPL
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/035—High pressure (>10 bar)
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/036—Very high pressure (>80 bar)
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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
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0165—Applications for fluid transport or storage on the road
- F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
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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
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0165—Applications for fluid transport or storage on the road
- F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
- F17C2270/0178—Cars
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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
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0165—Applications for fluid transport or storage on the road
- F17C2270/0184—Fuel cells
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- 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
Definitions
- the present invention relates to a knob cap for a high-pressure tank, and relates to a knob cap for a high-pressure tank that becomes a coupling portion with a shaft when manufacturing a high-pressure tank by winding a composite fiber on the surface of a liner by a filament winding technique.
- a high-pressure tank for storing a high-pressure gas such as hydrogen is installed.
- a high-pressure tank corresponding to type 4 is used as a high-pressure tank that stores high-pressure hydrogen gas.
- type 4 high-pressure tanks are manufactured by forming a composite layer on the surface of a liner made of plastic material using a filament winding technique.
- the liner is manufactured by bonding a metal boss and a knob to a plastic material such as polyolefin resin or polyamide resin.
- the composite layer is formed by winding composite fibers in which carbon fibers or glass fibers are mixed with a polymer resin such as an epoxy resin on the surface of a liner.
- a port is formed on one side, which is a head boss to which a valve for entering and exiting gases such as hydrogen is combined, and on the other side of the high pressure tank, a tail boss for the purpose of fixing the tank.
- a knob that is (tail boss) is provided.
- a method in which a metallic knob cap is externally coupled to the knob has been conventionally used.
- the knob cap is coupled to the fixed shaft to prevent shaking of the tank during the filament winding process, and the knob cap is entirely made of metal, which hinders the weight reduction of the high pressure tank.
- Patent Document 1 Japanese Unexamined Patent Publication No. 1998-332082 (1998.12.15)
- an object of the present invention is to provide a knob cap for a high-pressure tank capable of reducing weight and securing structural stability.
- another object of the present invention is to provide a knob cap for a high-pressure tank, capable of installing a reinforcing cap having impact resistance so that the protective effect against external impact is improved.
- a coupling groove is formed on the lower surface of the body to correspond to the knob of the high pressure tank liner, and extends outwardly in contact with the surface of the liner from the lower outer circumferential surface of the body. It is provided with a peripheral wing portion, the outer peripheral surface of the body is provided with a thickness converting portion for converting the thickness between the center line and the outer peripheral surface, a knob cap for a high pressure tank.
- a metal insert formed of a metal material coupled to the knob may be coupled to the coupling groove portion of the body.
- the metal insert may be formed in a cup shape having a hollow threaded on an inner circumferential surface.
- the body is formed with one or more inner grooves extending downward from the upper surface of the body.
- a disk-shaped reinforcing cap having a coupling protrusion coupled to the inner groove and having a hollow may be coupled to the upper surface of the body.
- the metal material of the metal insert includes aluminum, and the body is formed of fiber-reinforced plastic reinforced with glass fiber or carbon fiber.
- the thickness conversion unit may be in the form of a stepped step.
- the outer circumferential surface of the thickness converting unit may be in the form of an inclined surface such that the thickness of the body decreases upwardly, or may be in the form of a curved groove or a V-shaped groove concave toward a center line.
- a hollow fixing groove to which the fixing shaft can be coupled during the filament winding process is formed.
- a metal bushing may be coupled to the fixing groove.
- knob cap for a high-pressure tank having the configuration as described above, it is possible to form a plastic material such as fiber-reinforced plastic, so that the effect of reducing the weight of the high-pressure tank can be increased.
- a thickness conversion portion such as a step shape on the outer peripheral surface of the knob cap to control the generation of strong internal stress in the high pressure tank, it is possible to prevent damage to the knob cap and the high pressure tank.
- FIG. 1 is a block diagram of a liner to which a knob cap for a high pressure tank according to the present invention is coupled.
- FIG. 2 is a cross-sectional perspective view showing a knob cap for a high pressure tank according to the present invention.
- FIG 3 is a cross-sectional view showing a knob cap for a high pressure tank according to the present invention.
- FIG. 4 is a partial cross-sectional view illustrating embodiments of a thickness converting unit formed on an outer circumferential surface of a knob cap according to an exemplary embodiment of the present invention.
- FIG. 5 is a view showing a result of stress distribution analysis for a knob cap for a high pressure tank according to an embodiment of the present invention.
- FIG. 6 is a view showing a result of stress distribution analysis for a knob cap for a high pressure tank according to a reference example of the present invention.
- FIG. 1 is a block diagram of a high pressure tank liner according to the present invention.
- a high-pressure tank for storing a high-pressure gas such as hydrogen includes a liner 110 and a composite layer formed by winding a fiber-reinforced composite on an outer surface of the liner by a filament winding technique.
- the liner stores high-pressure gas in the inner space and maintains the gas tightness, and the composite layer supports the stress acting in the circumferential direction of the liner due to the internal pressure of the gas.
- the liner 110 uses plastic materials such as polyolefin-based resins and polyamide-based resins for weight reduction, and is manufactured through blow molding, rotational molding, or injection molding.
- the composite material layer 120 (see FIG. 3) is formed by wrapping a fiber-reinforced composite material in which carbon fiber or glass fiber is mixed with a polymer resin such as an epoxy resin on the surface of the liner 110 to maintain strength.
- the high-pressure tank 100 manufactured as described above is used for compressing and storing various fluids including liquefied petroleum gas (LPG), compressed natural gas (CNG), light hydrocarbons (methane, propane, butane) and hydrogen gas. .
- LPG liquefied petroleum gas
- CNG compressed natural gas
- light hydrocarbons methane, propane, butane
- hydrogen gas hydrogen gas
- a valve is coupled to one side of the liner 110 and a port 101 through which gaseous fuel can enter and exit is formed, and a knob 111 for fixing purpose is provided on the other side.
- a knob cap 200 is coupled to the knob 111 as shown in FIGS. 2 to 3.
- FIGS. 2 and 3 are a cross-sectional perspective view and a cross-sectional view showing a knob cap for a high-pressure tank according to the present invention.
- the knob cap 200 includes a body 201 coupled to the knob 111 of the liner 110 of the high pressure tank 100.
- the body 201 may be formed of a plastic material, and may further include a metal insert 211 made of a metal material.
- the plastic material of the knob cap body 201 is a fiber-reinforced plastic containing fibers in a plastic resin.
- a plastic resin a polyolefin-based resin (HDEP-based) or a polyamide-based (PA6, PA66, etc.), and a compound material based thereon or a combination of the above resins may be used, and the fiber is in the form of long fibers or short fibers. Carbon fiber or glass fiber of may be used.
- the fiber reinforced plastic according to the present invention may be a long fiber reinforced plastic (LFT; long fiber thermoplastic) or a short fiber reinforced plastic (SFT; short fiber thermoplastic). When fiber-reinforced plastic is applied, it is advantageous to have a weight ratio of 2 to 70% of the fiber.
- a metal insert 211 of a metal such as aluminum (Al) may be provided at a portion to which the knob 111 of the high pressure tank liner 110 is coupled.
- a metal insert 211 of a metal such as aluminum (Al)
- the body 201 By forming the body 201 of a plastic material and combining it with the metal insert 211, it is possible to reduce the weight and improve the durability of the portion coupled to the knob 111 of the liner 110.
- the knob cap 200 according to the embodiment of the present invention includes the metal insert 211, it may be manufactured by insert injection molding in which the metal insert 211 is inserted into a mold and a plastic material is injected.
- the body 201 has a coupling groove 210 formed in the center of the lower surface corresponding to the knob 111, and the coupling groove 210 ) Is provided with a metal insert 211.
- the metal insert 211 is a portion to which the knob 111 of the liner 110 is inserted and coupled, and may be formed in the shape of a hollow cup having a thread formed on an inner circumferential surface of the metal insert 211. Accordingly, it may be coupled to the knob 111 of the liner 110 having a thread formed on the outer circumferential surface through a screw fastening method. Since the metal insert 211 is integrally formed with the body 201, the knob cap 200 may be coupled to the knob 111 of the liner 110 by a screw fastening method. The metal insert 211 increases the durability of the knob cap 200.
- the body 201 of the knob cap 200 is provided with peripheral wing portions 220 extending outward from the lower end of the outer peripheral surface.
- the peripheral wing portion 220 extends while being connected to the outer peripheral surface of the body 201 and the outer surface of the liner 110 in a curve, and the entire bottom surface is in close contact with the liner 110.
- the body 201 of the knob cap 200 has a plurality of inner grooves 230 formed therein.
- the inner groove 230 is a column-shaped groove that extends downward from the upper surface of the body 201, that is, the upper end is open and extends downward.
- the inner groove 230 may be formed in the shape of a circular column or a polygonal column.
- the plurality of inner grooves 230 may be arranged in an annular shape surrounding the center line of the body 201, and a plurality of the inner grooves 230 are spaced at equal intervals in the circumferential direction, and a plurality of the inner grooves 230 are spaced apart in the radial direction.
- the inner groove 230 functions to prevent shrinkage from occurring when the mold is demolded after injection molding. That is, when the knob cap is demolded from the mold after molding, shape deformation may occur as the amount of cooling shrinkage increases in a relatively central portion, and the plurality of inner grooves 230 function to prevent shape deformation due to shrinkage. .
- the inner groove 230 may be equipped with a reinforcing material. That is, when there is a concern that a decrease in physical properties occurs due to the inner groove 230, a shape corresponding to the inner groove 230, for example, a circular column-shaped reinforcement may be inserted into the inner groove 230 to prevent a decrease in physical properties. .
- a hollow fixing groove 240 for fixing a fixing shaft (not shown) required for a filament winding process is formed in the center of the upper surface of the body 201 of the knob cap 200.
- a metal bushing 250 is installed inside the fixing groove 240 in order to increase the coupling force with the fixing shaft.
- the metal bushing 250 applied to the fixing groove 240 also strengthens the coupling force with the fixing shaft and prevents damage due to strong tension during the filament winding operation.
- a thickness conversion part 260 is formed on the outer circumferential surface of the body 201 of the knob cap 200.
- the thickness conversion unit 260 changes the thickness of the body defined between the center line and the outer circumferential surface, so that the outer circumferential surface has a different thickness at least in part in the height direction.
- the center line is a line passing through the center of the knob cap in the height direction.
- the thickness converting unit 260 improves the support for internal stress.
- the thickness converting portion 260 formed on the outer circumferential surface of the body 201 of the knob cap 200 may have a step shape in which a step 262 is formed. Since the thickness conversion unit 260 has a step 262, a reduced outer diameter portion 261 having a relatively reduced thickness is provided at an upper end of the outer circumferential surface.
- step 2 and 3 illustrate that one step is formed, it may be formed to reduce the thickness in a manner in which the step is continuously formed.
- the thickness conversion part 260 formed on the outer circumferential surface of the knob cap 200 allows the composite layer 120 to be reinforced during manufacture of the high-pressure tank. Since the composite layer 120 is reinforced to support stress, the knob cap 200 functions to improve structural stability.
- the thickness conversion part 260 is not limited to a step shape and may be formed in various shapes.
- FIG. 4 is a partial cross-sectional view illustrating embodiments of a thickness converting unit formed on an outer circumferential surface of a knob cap according to an exemplary embodiment of the present invention.
- the thickness conversion part 260 is formed in the shape of an inclined surface.
- the outer circumferential surface forms an inclined surface, and the thickness of the body decreases toward the upper side. Therefore, the top of the inclined surface is close to the center line and the bottom is located relatively far from the center line.
- the thickness conversion part 260 shown in FIG. 4A when formed at full height on the outer circumferential surface, the body has a trapezoidal cross section with a narrow upper end and a wide lower end.
- the thickness conversion part 260 may be formed in a curved groove shape.
- the curved groove is formed in a concave middle part toward the center line. Therefore, when a curved groove is formed on the outer circumferential surface, the body is the thinnest in the middle part.
- the thickness conversion unit 260 may have a V-shaped groove shape in which the middle portion is concave toward the center line. Therefore, the thickness of the body is the thinnest in the middle part.
- a concave portion toward the center line is shown to be formed in the middle portion, but the position may be changed.
- inclined surfaces, curved grooves, and V-shaped grooves may be formed throughout the height direction of the outer circumferential surface of the body, but may be formed in some portions.
- the thickness converting unit 260 as described above functions to suppress deformation of the stress acting in the outer direction of the liner 110 by improving the bonding force with the composite material layer 120.
- a reinforcing cap 300 covering the upper surface of the knob cap 200. It is formed in the shape of a hollow thin disc having a diameter or width larger than the diameter or width of the body 201 of the knob cap 200 of the reinforcing cap 300.
- the reinforcing cap 300 has a hollow 310, and a coupling protrusion 320 corresponding to the inner groove 230 is formed on the lower surface thereof. The coupling protrusion 320 is inserted and coupled to the inner groove 230.
- the reinforcing cap 300 is formed of EPP foam (Expanded Polypropylene foam) and has excellent recovery from repeated impacts and deformations, maintains high dimensional safety when exposed to extreme temperatures, impact resistance, and repeated buffering properties. , Flexibility and chemical resistance are excellent. Such a reinforcing cap 300 may increase a drop test of the high-pressure tank 100 and a responsiveness to external shocks.
- EPP foam Expanded Polypropylene foam
- the embodiment is the implementation of the knob cap shown in Figs. 2 and 3, the reference example is the same as the embodiment, but relates to a straight shape in which the thickness conversion part is not applied to the outer circumferential surface, and the comparative example is a knob cap made of a metal material. It is a conventional knob cap formed.
- aluminum (specifically, Al6061-T61) material was used for the metal insert, and long fiber reinforced plastic was used for the body in which the metal insert was inserted into the coupling groove.
- PA 6 was used as the mattress resin, and 50wt% of GF was included.
- Example Reference example Comparative example Material Al(metal insert)+LFT Al(metal insert)+LFT Al Suzy PA 6
- PA 6 Fiber (content) GF (50 wt%) GF (50 wt%) Weight(g) 312 330 586 Light weight reduction rate (%) 44.3 41.3 -
- FIG. 5 is a view showing a stress distribution analysis result for a knob cap for a high pressure tank according to an embodiment of the present invention
- FIG. 6 is a view showing a stress distribution analysis result for a knob cap for a high pressure tank according to a reference example.
- the liner was molded by a blow molding method using a PA-based resin. It can be molded by rotation molding or injection molding.
- the knob caps according to the Examples and Reference Examples were attached to the threaded protrusions, and the composite layer was formed by a filament winding technique.
- the stress distribution analysis was performed on the assumption that gas such as hydrogen was injected at high pressure inside after complete curing, and whether or not the knob was deformed at the minimum design rupture pressure (1,750 bar) was analyzed. Damage occurs when the stress value exceeds the tensile strength value of each material (Reference: Al6061-T61: 310Mpa, PA6+GF50wt%: 230Mpa)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
Description
| 실시예 | 참고예 | 비교예 | |
| 소재 |
Al(금속인서트)+LFT |
Al(금속인서트)+LFT |
Al |
| 수지 |
PA 6 |
PA 6 |
|
| 섬유(함량) |
GF(50 wt%) |
GF(50 wt%) |
|
| 무게(g) |
312 |
330 |
586 |
| 경량화율(%) |
44.3 |
41.3 |
- |
Claims (9)
- 바디의 하면에 고압탱크 라이너의 노브에 대응하는 결합홈부가 형성되고,상기 바디의 외주면 하단에서 외측으로 상기 라이너의 표면과 접촉하게 연장되는 주변 날개부를 구비하며,상기 바디의 외주면에는 중심선과 상기 외주면 사이의 두께를 변화시키는 두께 변환부가 형성된 것을 특징으로 하는 고압탱크용 노브캡.
- 제1항에 있어서,상기 결합홈부에는 상기 노브와 결합되는 금속 소재로 형성된 금속 인서트가 삽입되는 것을 특징으로 하는 고압탱크용 노브캡.
- 제2항에 있어서,상기 금속 인서트는 내주면에 나사산이 형성된 중공을 갖는 컵 형상인 것을 특징으로 하는, 고압탱크용 노브캡.
- 제1항에 있어서,상기 바디에는, 상기 바디의 상면으로부터 하방으로 연장된 하나 이상의 내측홈이 형성되는 것을 특징으로 하는 고압탱크용 노브캡.
- 제4항에 있어서,상기 바디의 상면에는, 상기 내측홈에 결합되는 결합돌기를 구비하고 중공이 형성된 보강캡이 결합되는 것을 특징으로 하는 고압탱크용 노브캡.
- 제2항에 있어서상기 바디는, 유리섬유 또는 탄소섬유가 보강된 섬유강화플라스틱으로 형성되고,상기 금속 인서트의 상기 금속 소재는 알루미늄을 포함하는 것을 특징으로 하는 고압탱크용 노브캡.
- 제1항에 있어서,상기 두께 변환부는, 단차가 형성된 계단 형태인 것을 특징으로 하는 고압탱크용 노브캡.
- 제1항에 있어서,상기 두께 변환부에서 상기 외주면은, 상기 바디의 두께가 상측으로 갈수록 감소되는 경사면 형태이거나, 중심선을 향해 오목한 곡선홈 또는 V자홈 형태인 것을 특징으로 하는 고압탱크용 노브캡.
- 제1항에 있어서,상기 바디 상면 중앙에는, 필라멘트 와인딩 공정을 수행할 때 고정 샤프트가 결합 가능한 중공의 고정홈이 형성된 것을 특징으로 하는 고압탱크용 노브캡.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20889313.1A EP4063712B1 (en) | 2019-11-19 | 2020-11-18 | Knob cap for high-pressure tank |
| US17/777,710 US12031681B2 (en) | 2019-11-19 | 2020-11-18 | Knob cap for high-pressure tank |
| JP2022529024A JP7701922B2 (ja) | 2019-11-19 | 2020-11-18 | 高圧タンク用ノブキャップ |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2019-0148484 | 2019-11-19 | ||
| KR1020190148484A KR102363384B1 (ko) | 2019-11-19 | 2019-11-19 | 고압탱크용 노브캡 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021101239A1 true WO2021101239A1 (ko) | 2021-05-27 |
Family
ID=75980803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2020/016248 Ceased WO2021101239A1 (ko) | 2019-11-19 | 2020-11-18 | 고압탱크용 노브캡 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12031681B2 (ko) |
| EP (1) | EP4063712B1 (ko) |
| JP (1) | JP7701922B2 (ko) |
| KR (1) | KR102363384B1 (ko) |
| WO (1) | WO2021101239A1 (ko) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12031681B2 (en) | 2019-11-19 | 2024-07-09 | Lotte Chemical Corporation | Knob cap for high-pressure tank |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102536217B1 (ko) * | 2022-01-28 | 2023-05-26 | 주식회사 에테르씨티 | 수소용 저장용기 |
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- 2020-11-18 WO PCT/KR2020/016248 patent/WO2021101239A1/ko not_active Ceased
- 2020-11-18 EP EP20889313.1A patent/EP4063712B1/en active Active
- 2020-11-18 JP JP2022529024A patent/JP7701922B2/ja active Active
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| US12031681B2 (en) | 2019-11-19 | 2024-07-09 | Lotte Chemical Corporation | Knob cap for high-pressure tank |
Also Published As
| Publication number | Publication date |
|---|---|
| US20230003347A1 (en) | 2023-01-05 |
| KR102363384B1 (ko) | 2022-02-15 |
| JP2023502124A (ja) | 2023-01-20 |
| EP4063712A4 (en) | 2023-11-29 |
| EP4063712B1 (en) | 2025-08-06 |
| JP7701922B2 (ja) | 2025-07-02 |
| EP4063712A1 (en) | 2022-09-28 |
| US12031681B2 (en) | 2024-07-09 |
| KR20210060920A (ko) | 2021-05-27 |
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