JP2005133847A - Pressure vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure vessel capable of sufficiently taking the axial orientation of reinforcement fiber of FRP constituting a shell, even when an in-tank valve is mounted on the pressure tank having a gas barrier liner and the shell made out of FRP and covering an outer side of the liner, and inhibiting the lowering of strength with the same weight in comparison with a conventional one. <P>SOLUTION: A hydrogen tank 11 is formed into the shape having dome parts on both ends of a cylindrical part, has the long hollow liner 12 and a fiber reinforced-resin layer 13 as the shell made out of a fiber reinforced composite material and covering the outer side of the liner 12, and further comprises the in-tank valve 14. The in-tank valve 14 is mounted on a mouthpiece part 16 as a valve mounting part of the liner 12 in a state that a valve main body 14a including at least a decompression valve is mounted inside of the liner 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure vessel, and more particularly, to a pressure vessel having a gas barrier liner (inner shell) covered with an outer shell made of pressure resistant fiber reinforced resin (FRP) and having a valve mechanism such as a pressure reducing valve. .

  A pressure vessel containing compressed natural gas (CNG), liquefied natural gas (LNG), or the like is generally heavy because it is made of metal such as steel or aluminum alloy. In recent years, automobiles using natural gas as fuel have attracted attention as low-emission vehicles, and automobiles using fuel cells as a power source have attracted attention as low-emission vehicles. Some automobiles store hydrogen gas in the fuel tank as the fuel for the fuel cell, but the pressure vessel serving as the fuel tank is heavy and the fuel consumption is deteriorated. In order to eliminate this inconvenience, a pressure vessel in which a gas barrier liner (inner shell) is covered with an outer shell made of pressure resistant fiber reinforced resin (FRP) has been proposed.

  In order to use the gas filled in the pressure vessel at a high pressure at a low pressure, it is necessary to reduce the pressure with a pressure reducing valve and supply the gas. If a valve mechanism (valve assembly) including a pressure reducing valve is attached to the outside of the pressure vessel, the valve mechanism may easily hit the surrounding objects during transportation or installation, and high pressure gas may blow out of the pressure vessel due to the damage. There is. In particular, when the accommodation space is limited, such as an automobile, the valve mechanism tends to hit the surroundings.

  In order to solve this problem, there is provided a high-pressure tank device (pressure vessel) in which a valve mechanism having a pressure reducing valve for reducing the high pressure gas filled in the pressure vessel to a low pressure suitable for use is provided in the gas outlet. It has been proposed (see, for example, Patent Document 1).

  As shown in FIG. 5, the high-pressure tank device described in Patent Document 1 is provided so as to be located in the high-pressure tank 41 at a high-pressure tank 41 filled with a high-pressure gas and a gas outlet 42 of the high-pressure tank 41. And a valve mechanism 43. The high-pressure tank 41 includes a liner 44 and a covering material 45 that reinforces the outer surface of the liner 44. The valve mechanism 43 includes an opening / closing valve that opens and closes the inside and outside of the high-pressure tank 41, and a pressure-reducing valve (none of which is shown) that is connected in series to the opening / closing valve and depressurizes high-pressure gas in the high-pressure tank 41. ing. The valve mechanism 43 is accommodated in a capsule 46 having a bottomed cylindrical shape and having an external thread formed on the outer peripheral surface. The capsule 46 is accommodated in an internal thread 42 a formed on the inner peripheral surface of the gas outlet 42 of the high-pressure tank 41. It is fixed in an airtight state in a screwed state. The capsule 46 has a flange 46 a, and is screwed into the female screw portion 42 a from the outside of the high-pressure tank 41 in a state where the flange 46 a is in contact with the end face of the gas outlet 42.

In addition, a pressure vessel using a liner in which two cups including a metal peripheral wall portion and an end wall are joined to each other by a connection structure between the peripheral wall portions has been proposed (see, for example, Patent Document 2). ). As shown in FIG. 6, the liner 51 of the pressure vessel described in Patent Document 2 includes a connection structure 53 including two cups 52 including a metal cylindrical peripheral wall portion 52 a and a spherical end wall portion 52 b. Connected by. A narrow cylindrical neck portion 54 protruding outward is formed at the center of one end wall portion 52b, and a base 55 made of the same material as the liner 51 is inserted into the neck portion 54 from the inside. It is being fixed by the welding part 56 with the opening edge of.
JP 2003-90499 A (paragraphs [0018] to [0021] in FIG. 1, FIG. 1) Japanese Patent Laid-Open No. 9-42594 (paragraphs [0015] to [0019] of FIG. 1, FIG. 1)

  Since the valve mechanism is provided in the gas outlet, the high-pressure tank apparatus described in Patent Document 1 can prevent the valve mechanism from hitting and damaging the surroundings during transportation or installation. However, since the valve mechanism 43 is attached to the high-pressure tank 41 after the high-pressure tank 41 is manufactured, the diameter of the female screw portion 42 a is larger than the diameter of the capsule 46 that accommodates the valve mechanism 43.

  In the case of a high pressure tank having a fiber reinforced composite outer shell on the outside of the liner and a dome portion at both ends of the cylindrical portion, the principal stress direction of the pressure tank is the axial direction and the circumferential direction, and the fiber reinforced composite material Is the optimal fiber arrangement in which the fibers are arranged in the principal stress direction. However, when the diameter of the female thread provided at the gas outlet of the liner increases, the outer diameter of the gas outlet also increases, making it difficult to sufficiently wind the fiber that reinforces the axial direction around the surface of the liner. The strength of is reduced. This is because the fiber that reinforces the axial direction is wound so as to fold back in contact with the gas outlet that protrudes from the center of the end of the liner and the protruding portion that is located on the opposite side. When it becomes larger, the angle formed by the arrangement direction of the fibers and the axial direction becomes larger. Therefore, it becomes impossible to effectively bear the force acting in the axial direction of the high-pressure tank. Therefore, in order to ensure the required strength, it is necessary to increase the thickness of the liner to increase its strength, and the liner becomes heavier accordingly, making it difficult to reduce the weight of the high-pressure tank.

  Patent Document 2 discloses that the base 55 is inserted into the neck portion 54 from the inside of the liner 51 and fixed by the welded portion 56. Patent Document 2 aims to manufacture a lightweight pressure vessel at low cost by forming a liner by deep drawing of a thin plate. Unlike Patent Document 1, the valve mechanism is accommodated in the pressure vessel. Is not considered at all. Since the female screw hole 55a for pipe connection is formed in the base 55, if the valve mechanism is to be accommodated in the pressure vessel, the base 55 is formed in a large diameter as in Patent Document 1, and the female screw hole 55a is sized according to the outer diameter of the housing in which the valve mechanism is used. Therefore, the defect of patent document 1 cannot be solved.

  The present invention has been made in view of the above problems, and its object is to form an outer shell even if an in-tank valve is provided in a pressure vessel having a liner having a gas barrier property and an outer shell made of FRP. An object of the present invention is to provide a pressure vessel that can sufficiently align the axial direction of FRP reinforcing fibers and can suppress a decrease in strength with the same weight as that of a conventional one.

  In order to achieve the above object, the invention according to claim 1 is formed in a shape having a dome portion at both ends of a cylindrical portion and has a gas barrier property, and an outer shell made of a fiber reinforced composite material covering the outside thereof. And a pressure vessel provided with an in-tank valve. The in-tank valve is attached to the valve attachment portion of the liner in a state where the valve main body is disposed inside the liner.

  In the present invention, unlike the prior art, the valve body is attached to the liner valve mounting portion in a state of being arranged inside the liner. Therefore, the diameter of the hole that is formed in the valve mounting portion and connects the inside and the outside of the liner is determined by the gas passage filled in the pressure vessel or supplied from the inside of the pressure vessel to the outside, and the power source and signal for driving the valve. The size may be as large as necessary to secure the passage portion of the wire, and the diameter is smaller than when securing a space for accommodating the valve. Accordingly, the reinforcing fibers constituting the outer shell of the fiber reinforced composite material covering the outside of the liner can be wound around the liner in a state oriented to increase the strength in the axial direction. The weight reduction of the pressure vessel can be suppressed by weight.

  The invention according to claim 2 is the invention according to claim 1, wherein the liner is divided or sealed in a sealed state at least on the side where the valve mounting portion is provided. . Therefore, in the present invention, the operation of assembling the in-tank valve so that the valve main body is located inside the liner is easier than when the liner is divided only on the opposite side.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the liner is entirely made of aluminum or an aluminum alloy. Therefore, in this invention, manufacture becomes easy compared with what formed the valve attachment part and the other part with another material.

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the liner has a base portion or the valve mounting portion formed of stainless steel, aluminum, or an aluminum alloy, and the remaining portion is made of resin. And what was divided | segmented is what was joined. In the present invention, the weight can be easily reduced as compared with a case where the whole is made of metal. Moreover, it is more resistant to fatigue than a product made entirely of aluminum.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the in-tank valve has a screw hole formed in the valve mounting portion other than the valve main body. It is fixed to the valve mounting portion in a state where it is screwed at the portion. In this invention, since the in-tank valve is fixed to the liner by being screwed into a screw hole formed in the valve mounting portion, the work is simpler than welding, and it is easy to ensure sealing performance. Thus, there is no possibility that the heat during welding adversely affects the valve.

  The invention according to claim 6 is the invention according to any one of claims 1 to 4, wherein the in-tank valve is capable of penetrating a hole formed in the valve mounting portion and has a male screw portion at the tip. The insertion portion is inserted into the hole with the male screw portion protruding from the hole, and is fixed to the valve mounting portion with a nut screwed into the male screw portion. Yes. In this invention, since the in-tank valve is fastened and fixed to the liner by screws, as in the invention according to claim 5, the work is simplified as compared to welding, and the sealing performance is easily secured. There is no risk that heat during welding will adversely affect the valve. Further, the liner may be formed with a hole instead of the screw hole, and the manufacturing is simplified.

  According to the present invention, even if an in-tank valve is provided in a pressure vessel having a liner having a gas barrier property and an outer shell made of a fiber-reinforced composite material covering the outside thereof, the reinforcement of the fiber-reinforced composite material constituting the outer shell is provided. The fiber can be sufficiently oriented in the axial direction, and a decrease in strength can be suppressed with the same weight as compared with the conventional one.

(First embodiment)
A first embodiment in which the present invention is embodied in a hydrogen storage tank (hereinafter simply referred to as a hydrogen tank) as a pressure vessel will be described below with reference to FIGS. FIG. 1 is a schematic sectional view of a hydrogen tank, and FIG. 2 is a schematic diagram showing label winding.

  As shown in FIG. 1, the hydrogen tank 11 is formed in a shape having dome portions at both ends of a cylindrical portion, and is an elongated hollow liner 12 and fibers as an outer shell made of a fiber reinforced composite material covering the outside of the liner 12. A reinforced resin layer 13 and an in-tank valve 14.

  In this embodiment, the fiber reinforced resin layer 13 is made of CFRP (Carbon Fiber Reinforced Plastics) using carbon fibers as reinforced fibers, and ensures the pressure resistance (mechanical strength) of the hydrogen tank 11. The fiber reinforced resin layer 13 is formed by winding a carbon fiber bundle impregnated with a resin (for example, unsaturated polyester resin, epoxy resin, etc.) around the liner 12 so as to have a helical winding layer, a hoop winding layer, and a label winding layer. It is formed by thermosetting. As shown in FIG. 2, the label winding means a winding method in which the fiber F is wound around the rack so as to be almost parallel to the central axis 12 a of the liner 12.

  The liner 12 includes two liner units 17 a and 17 b each composed of a resin tubular portion 15 and a base portion 16 fixed to one end of the tubular portion 15. It is formed by joining. Both liner units 17a, 17b are formed identically. The base portion 16 of one liner unit 17a constitutes a valve mounting portion. The base portion 16 is made of stainless steel, and the cylindrical portion 15 is made of, for example, high density polyethylene (HDPE) or polyamide (nylon).

  The base part 16 is formed in a shape that forms a part of the dome part, and has a boss part 16a protruding outward at the center part, and the boss part 16a has an inner side of the liner 12 so as to penetrate the center. A screw hole 16b is formed as a hole for communicating the outside and the outside. The diameter of the screw hole 16b is sufficient to secure a passage for the gas filled in the hydrogen tank 11 or supplied to the outside from the inside of the hydrogen tank 11, and a passage for the power line and the signal line for driving the in-tank valve 14. It is formed in a required size, and is formed to be ½ or less of the case where a conventional in-tank valve is screwed.

  The in-tank valve 14 includes a valve main body 14a having functions such as an on / off solenoid valve, a pressure regulating valve (pressure reducing valve), a safety valve, and a check valve (not shown), and an insertion portion 14b having a smaller diameter than the valve main body 14a. The insertion portion 14b is formed with a male screw portion that is screwed into the screw hole 16b. Then, the male threaded portion is screwed into the screw hole 16b from the inside of the liner 12, whereby the in-tank valve 14 is attached to the valve attaching portion of the liner 12 with the valve body 14a being disposed inside the liner 12. ing. An annular recess is formed in the base portion 16 at a location corresponding to the inside of the liner 12 of the screw hole 16b, and an O-ring 18 serving as a seal ring is disposed in the annular recess, and between the valve body 14a and the liner 12. Airtightness is ensured.

  A plug 19 is screwed into a screw hole 16b of the base part 16 provided on the side opposite to the base part 16 as a valve mounting part. A seal ring (not shown) is also interposed between the embedding plug 19 and the base part 16.

  Next, a method for manufacturing the hydrogen tank 11 configured as described above will be described. When manufacturing the hydrogen tank 11, the base portion 16 is first processed. Next, insert molding is performed in a state where the base portion 16 is disposed in the injection mold, and the liner units 17a and 17b are formed separately. Next, the in-tank valve 14 is assembled from the inside to the base portion 16 of one liner unit 17a. That is, the insertion portion 14b of the in-tank valve 14 is screwed into the screw hole 16b and fixed.

  Next, the tubular portions 15 made of resin are joined to each other by heat welding in a state where the tubular portions 15 of both liner units 17a and 17b are in contact with each other. Next, the bonded liner 12 is set in a filament winding apparatus, and filament winding is performed. A resin-impregnated carbon fiber bundle is formed on the outer surface of the liner 12 with a predetermined number of helical winding layers, label winding layers, and hoop winding layers. Wrap up to. The hoop winding layer is mainly formed in the cylindrical portion of the liner 12. Next, the liner 12 around which the resin-impregnated fiber bundle is wound is removed from the filament winding apparatus, and placed in a heating furnace to heat and cure the resin. Next, after removing burrs and the like, a pressure resistance and an airtight test are performed, and the plug 19 is attached to the base part 16 on the liner unit 17b side of the acceptable product, and the manufacture of the hydrogen tank 11 is completed.

Next, the operation of the hydrogen tank 11 configured as described above will be described.
The hydrogen tank 11 is used as a hydrogen source of a fuel cell of a fuel cell vehicle, for example. The hydrogen tank 11 is used in a state in which a pipe (not shown) is connected to the insertion portion 14b of the in-tank valve 14, and the hydrogen tank 11 is filled with hydrogen gas from the filling pipe when filling with hydrogen gas. The hydrogen tank 11 is filled with hydrogen gas so as to have a pressure of several tens of MPa, for example.

  The hydrogen tank 11 that has been filled is connected to a supply pipe. Then, an on / off solenoid valve and a pressure regulating valve (pressure reducing valve) built in the valve main body 14a are driven by a control signal from a control device (not shown), and the hydrogen gas is reduced to a predetermined pressure so that the fuel of the fuel cell Supplied to the electrode (hydrogen electrode).

  When the hydrogen tank 11 is filled with hydrogen gas, the pressure in the hydrogen tank 11 increases, and the valve body 14 a of the in-tank valve 14 is pressed against the base portion 16. Since the O-ring 18 is interposed between the valve main body 14 a and the base part 16, the sealing performance between the valve main body 14 a and the base part 16 is obtained when the valve main body 14 a is pressed against the base part 16. Will improve.

  The inside of the hydrogen tank 11 becomes a high pressure, and a force in the axial direction of the hydrogen tank 11 acts on the base portion 16 greatly. In this embodiment, since the valve mechanism (valve assembly) is not accommodated in the boss part 16a of the base part 16 unlike the prior art, the outer diameter of the boss part 16a is reduced. Therefore, the angle formed by the fibers constituting the label winding layer and the axial direction of the liner 12 is smaller than that of the conventional one, and the number of label winding layers can be increased. That is, the fiber that reinforces the axial direction of the hydrogen tank 11 can be sufficiently wound.

This embodiment has the following effects.
(1) In a pressure vessel having a liner 12 having a gas barrier property and a fiber reinforced resin layer 13 covering the outside thereof and having an in-tank valve 14, the in-tank valve 14 is a valve mounting portion ( The valve body 14 a is attached to the base part 16) in a state where it is arranged inside the liner 12. Accordingly, the reinforcing fibers constituting the fiber reinforced resin layer 13 covering the outside of the liner 12 can be wound around the liner 12 in a state of being oriented so as to increase the strength in the axial direction. Thus, a decrease in strength of the pressure vessel can be suppressed. Therefore, if the pressure resistance is the same, the weight can be reduced.

  (2) The liner 12 is divided at least on the side where the valve mounting portion (cap portion 16) is provided and is joined in a sealed state. Therefore, the work of assembling the in-tank valve 14 so that the valve main body 14a is positioned inside the liner 12 is easier than when the liner 12 is divided only on the opposite side.

  (3) The liner 12 has a configuration in which the base portion 16 (valve mounting portion) is made of stainless steel, the remaining portion is made of resin, and the divided portions are joined. Therefore, the weight can be easily reduced as compared with the case where the whole is made of metal. In addition, it is more resistant to fatigue than those made entirely of aluminum.

  (4) The liner 12 is formed by joining the end portions of the cylindrical portion 15 to the liner units 17a and 17b in which the base portion 16 and the resin cylindrical portion 15 are integrally formed by insert molding. . Therefore, the liner 12 is formed in a state in which the airtightness between the base part 16 and the cylindrical part 15 is ensured, but the structure in which the cylindrical part 15 and the base part 16 as separate members are assembled is not insert molding. It becomes easier to compare.

  (5) The in-tank valve 14 is fixed to the valve mounting portion in a state where the in-tank valve 14 is screwed into a screw hole 16b formed in the base portion 16 as a valve mounting portion at a portion other than the valve main body 14. Accordingly, since the in-tank valve 14 is fixed to the liner 12 by being screwed into the screw hole 16b formed in the valve mounting portion, the work is simplified and the sealing performance is ensured as compared with welding. It becomes easy, and there is no possibility that the heat during welding will adversely affect the valve.

  (6) The insertion portion 14b of the in-tank valve 14 only needs to have a size necessary for securing a gas passage and a passage portion for a power supply line and a signal line for driving the in-tank valve 14. The diameter can be reduced to ½ or less as compared with the conventional one having a built-in valve mechanism.

  (7) In the conventional configuration in which the in-tank valve is accommodated in the screw hole, it is necessary to bear all of the pressure in the tank acting on the in-tank valve with the screw portion. However, in this embodiment, a part of the pressure in the tank acting on the in-tank valve 14 is carried by the inner surface of the base part 16. Therefore, unlike the conventional configuration in which it is necessary to bear all of the pressure in the tank acting on the in-tank valve with the threaded portion, it is not necessary to improve the strength of the threaded portion provided in the base portion 16.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that the entire liner 12 is made of metal and a nut is used for fixing the in-tank valve 14 to the liner 12. Portions similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The liner 12 is fitted with aluminum alloy caps 21 and 22 at both ends of an aluminum alloy cylindrical portion 20 and is fastened and fixed by bolts (not shown). The base portions 21 and 22 include annular convex portions 21a and 22a that are fitted into openings 20a formed at both ends of the cylindrical portion 20, and flange portions 21b and 22b that are larger in diameter than the annular convex portions 21a and 22a. ing. A seal ring 23 is provided between the peripheral surfaces of the annular protrusions 21a and 22a and the peripheral surface of the opening 20a to ensure the sealability (airtightness) of the divided portion of the liner 12. That is, the liner 12 is fitted and sealed with the tubular portion 20 and the base portion 21 fitted with each other using the seal ring 23.

  In the base part 21 to which the in-tank valve 14 is assembled, a hole 21d is formed in the boss part 21c instead of a screw hole. The insertion portion 14b of the in-tank valve 14 is not formed with a male screw portion as a whole, but is formed with a male screw portion 14c at a portion protruding from the hole 21d of the boss portion 21c. The in-tank valve 14 is fixed to a base portion 21 as a valve mounting portion with a nut 24 screwed into the male screw portion 14c.

  When manufacturing the hydrogen tank 11 configured as described above, the in-tank valve 14 is first assembled inside the base portion 21. Next, the base part 21 is fitted to one end of the cylindrical part 20 and the base part 22 is fitted to the other end, and is assembled by a bolt (not shown) to prepare the liner 12 having the in-tank valve 14 assembled therein. The liner 12 is set in a filament winding apparatus, filament winding is performed, and a resin-impregnated fiber bundle is wound around the outer surface of the liner 12 until a predetermined number of helical winding layers, label winding layers, and hoop winding layers are formed. The hoop winding layer is mainly formed on the body of the liner 12. Next, the liner 12 around which the resin-impregnated fiber bundle is wound is removed from the filament winding apparatus, and placed in a heating furnace to heat and cure the resin. Next, after removing burrs and the like, the plug 19 is screwed into the screw hole 22d formed in the boss portion 22c of the base portion 22, and the manufacture of the hydrogen tank 11 is completed.

This embodiment has the following effects in addition to the same effects as (1), (2), and (6) of the first embodiment.
(8) The liner 12 is entirely formed of an aluminum alloy. Accordingly, the manufacturing is facilitated as compared with the case where the valve mounting portion (cap portion 21) and the other portion (cylindrical portion 20) are formed of different materials.

  (9) The in-tank valve 14 includes an insertion portion 14b that can pass through a hole 21d formed in the valve mounting portion (cap portion 21) and has a male screw portion 14c at the tip. The insertion portion 14b is inserted into the hole 21d with the male screw portion 14c protruding from the hole 21d, and is fixed to the base portion 21 with a nut 24 screwed into the male screw portion 14c. Accordingly, since the in-tank valve 14 is fastened and fixed to the liner 12 by screws, the work is simpler than welding, and it is easy to ensure sealing performance, and heat during welding may adversely affect the valve. There is no. Further, it is only necessary to form a hole 21d in the liner 12 in place of the screw hole 16b, which simplifies the manufacture.

The embodiment is not limited to the above, and may be configured as follows, for example.
The shape of the in-tank valve 14 is not limited to the shape in which the on / off solenoid valve, the pressure regulating valve (pressure reducing valve), the safety valve, the check valve, etc. are all housed in one housing as the valve body 14a. As shown in FIG. 4, a plurality of valves 25 (valves) may be supported independently. Since the valve main body 14a is disposed inside the base portion 16, the valve main body 14a does not necessarily need to be made compact. In this case, the degree of freedom of arrangement of the valves is higher than in a configuration in which each valve 25 is accommodated in one housing.

  The cross-sectional shape of the annular recess 16c that accommodates an O-ring 18 (seal ring) that seals between the in-tank valve 14 and the base 16 is not limited to a quadrangle, and may be a triangle as shown in FIG. Good.

In the first embodiment, the material of the base portion 16 is not limited to stainless steel, and other metals such as an aluminum alloy or aluminum may be used.
The in-tank valve 14 does not have to include all on / off solenoid valves, pressure regulating valves (pressure reducing valves), safety valves, check valves, and the like. However, it is preferable to provide at least a pressure reducing valve. For example, a check valve may be fixed in place of the plug 19 and gas filling may be performed from the side opposite to the side where the in-tank valve 14 is disposed.

  In the second embodiment, the entire liner 12 may be made of aluminum instead of an aluminum alloy, or the base portion 16 and the cylindrical portion 20 may be made of different metals.

  The liner 12 is not limited to the configuration in which the liner 12 is divided at both end portions and the base portions 16, 21, and 22 are provided at each end portion, and may be configured to be divided only on one side. However, when only one side is divided, it is necessary to form the end portion on the non-divided side by spinning processing (mouth drawing processing), and it takes time for processing.

  The hydrogen tank 11 is not limited to the one used as a hydrogen source of an electric vehicle equipped with a fuel cell, and may be applied to a hydrogen source of a hydrogen engine, a heat pump, or the like, for example. Moreover, you may use as a hydrogen source of the fuel cell of a household power supply.

O It may apply not only to the hydrogen tank which stores hydrogen as a pressure vessel but to a pressure vessel which stores other gas, such as nitrogen and compressed natural gas, for example.
○ Reinforcing fiber of fiber reinforced resin is not limited to carbon fiber, but other fibers generally called high elasticity and high strength such as glass fiber, silicon carbide ceramic fiber, aramid fiber, ultra high molecular weight polyethylene fiber, etc. are used as reinforcing fiber. May be.

The following technical idea (invention) can be understood from the embodiment.
(1) In invention of Claim 4, the said nozzle | cap | die part or a valve | bulb attachment part, and the resin-made remaining part are integrally formed by insert molding.

The schematic cross section of the hydrogen tank of a 1st embodiment. The schematic diagram which shows a label volume. The schematic cross section of the hydrogen tank of 2nd Embodiment. The schematic cross section which shows the attachment state of the in-tank valve of another embodiment. Sectional drawing of the high-pressure tank apparatus of a prior art. FIG. 3 is a cross-sectional view of another prior art pressure vessel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Hydrogen tank as a pressure vessel, 12 ... Liner, 13 ... Fiber reinforced resin layer as outer shell, 14 ... In-tank valve, 14a ... Valve body, 14b ... Insertion part, 14c ... Male thread part, 16, 21 ... Valve Base part as an attachment part, 16b, 22d ... screw hole, 22 ... base part, 21d ... hole, 24 ... nut.

Claims (6)

A pressure vessel formed in a shape having a dome portion at both ends of a cylindrical portion and having a gas barrier property and an outer shell made of a fiber reinforced composite material covering the outside thereof, and having an in-tank valve ,
The in-tank valve is a pressure vessel attached to a valve attachment portion of the liner in a state where a valve main body is disposed inside the liner.   The pressure vessel according to claim 1, wherein the liner divided at least on the side on which the valve mounting portion is provided is joined or fitted and sealed in a sealed state.   The pressure vessel according to claim 1 or 2, wherein the liner is entirely made of aluminum or an aluminum alloy.   3. The liner according to claim 1, wherein the liner has a base portion or the valve mounting portion formed of stainless steel, aluminum, or an aluminum alloy, the remaining portion is made of resin, and divided portions are joined. Pressure vessel.   The said in-tank valve is fixed to the said valve attachment part in the state screwed in the screw hole formed in the said valve attachment part in parts other than the said valve main body. The pressure vessel according to one item.   The in-tank valve includes an insertion portion that can pass through a hole formed in the valve mounting portion and has a male screw portion formed at a tip thereof, and the insertion portion is inserted into the hole in a state where the male screw portion protrudes from the hole. The pressure vessel according to any one of claims 1 to 4, wherein the pressure vessel is fixed to the valve mounting portion with a nut that is inserted and screwed into the male screw portion.

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