JP2008101677A - High pressure gas container - Google Patents

Abstract

The present invention provides a high-pressure gas container that prevents gas leakage caused by an increase in a gap between a boss portion of a resin liner and a base portion, and that has a simple structure between a boss portion and a base portion of a resin liner.
A high-pressure gas container includes a resin liner, a fiber reinforcing layer that reinforces the resin liner, and a base that is inserted into an inner peripheral surface of a boss of the resin liner and connected to a gas device. 30, the base 30 includes a connection fitting 31 provided with a flange portion 33 that comes into contact with the boss end surface on a shaft portion inserted into the inner peripheral surface of the boss, and the connection fitting 31. And a pressing metal fitting 40 for pressing the outer peripheral surface and the end surface of the boss.
[Selection] Figure 1

Description

  The present invention relates to a high-pressure gas container in which a resin liner is reinforced with a fiber reinforced resin, and more particularly to a high-pressure gas container having a base structure suitable for a high-pressure gas container used for an automobile fuel tank or the like.

  As one of the important measures for environmental problems, automobiles using hydrogen gas or the like as fuel are being studied. High-pressure gas containers with a capacity of 35MPa and more than 70MPa are being studied as fuel tanks for such automobiles, and because of their light weight, high-pressure gas containers with a resin liner reinforced with fiber reinforced resin are attracting attention. Yes.

  Such a high-pressure gas container is connected to a gas device such as a valve at its base, and the high-pressure gas such as hydrogen filled in the high-pressure gas container is used by controlling the gas device. And since metals, such as a brass and stainless steel, are used for gas equipment, metals, such as aluminum and stainless steel, are generally used for a nozzle | cap | die part. For this reason, since the boss portion of the resin liner to which the base is mounted is a resin having a large distortion amount and inferior hardness and strength compared to such a metal or the like, the creep phenomenon of the boss portion, the boss and the base There is a problem of leakage of high-pressure gas that occurs due to peeling of the bonded portion, poor sealing performance related to deformation of the boss portion, and the like.

  For such a problem, for example, Patent Document 1 discloses a pressure-resistant container having a hollow container body made of fiber-reinforced synthetic resin and an opening protruding from the main body, provided with a recess on the outer side of the opening. There has been proposed a pressure vessel in which a mounting jig having a shape obtained by dividing an annular body is arranged and a lid member is fixed to the mounting jig.

  Patent Document 2 discloses a synthetic resin liner having a mounting hole at an end, a cylindrical boss that passes through the mounting hole, and a flange that protrudes from the outer periphery of the boss and contacts the inner surface of the liner. The liner is formed in a state where it does not touch the base, and the base is between the flange portion and the inner surface of the liner or the boss portion and the There has been proposed a pressure vessel attached to the liner via a seal member between the inner peripheral surface of the attachment hole. Further, in Patent Document 3, a pair of adjacent members adjacent to each other, elasticity, a sealing member for sealing an adjacent portion of the pair of adjacent members, and the pair of adjacent members There has been proposed a tank provided with at least one of the pair of adjacent members in the adjacent portion, and a high hardness portion whose hardness is higher than that of at least one of the pair of adjacent members.

  Further, in Patent Document 4, the metal fitting is present on the inner side containing gas with respect to the synthetic resin liner and the outer side opposite thereto, and the synthetic resin liner is sandwiched by the screw fastening mechanism. Each of the metal fittings is composed of an integral part, and rips to at least one place between the outer peripheral surface of the inner metal fitting and the inner peripheral surface of the synthetic resin liner or between the inner peripheral surface of the outer metal fitting and the outer peripheral surface of the liner. A pressure vessel having a sealing mechanism using a packing has been proposed.

JP 2001-317697 JP 2000-291887 JP 2005-48919 JP 2005-265138 A

  However, in such a conventional high-pressure gas container, there are a base portion inserted into the inner peripheral surface of the boss of the resin liner and connected to a gas device such as a valve, and a base portion provided on the outer peripheral surface of the boss. The boss part is sandwiched as a unit, but the boss part shrinks due to the tensile force of high-pressure gas, so it is easy to create a gap on the contact surface with the base and easily leak gas. There is a problem that.

  In addition, the high-pressure gas container proposed in Patent Document 1 is provided with irregularities that lower the strength at the boss portion, and further includes a container made of only a reinforced resin layer without a resin liner. There is a problem that it is not necessarily suitable for a high-pressure gas container that can be used for a fuel tank. The bosses and base portions of the high-pressure gas containers proposed in Patent Documents 2 to 4 have a complicated structure, and there is a problem that it is not easy to ensure quality performance.

  The present invention prevents gas leakage caused by expansion of the gap with the base portion due to deformation of the boss portion of the resin liner, and the boss portion and base portion of the resin liner are simple with respect to the conventional problems. The object is to propose a high-pressure gas container having a structure.

  A high-pressure gas container according to the present invention includes a resin liner, a fiber reinforced layer that reinforces the resin liner, and a base that is inserted into an inner peripheral surface of a boss of the resin liner and to which a gas device is connected. A high-pressure gas container, wherein the base includes a connection fitting provided with a flange portion that comes into contact with the end surface of the boss on a shaft portion inserted into the inner peripheral surface of the boss, and an outer periphery of the boss integrated with the connection fitting. And a press fitting that presses the face and the end face.

  In the above invention, the pressing fitting may be composed of a split ring having a taper screw on the outer peripheral portion and a nut screwed into the split ring.

  The resin liner is preferably provided with a plurality of convex ribs at equal intervals on the outer periphery of the boss, and preferably has a flange portion at the end of the boss.

  It is preferable that a sealing mechanism is provided on the inner peripheral surface of the boss of the resin liner and the contact surface of the shaft portion of the connection fitting and / or the contact surface of the boss end surface and the flange portion of the connection fitting. And it is good for the sealing mechanism to be provided in the boss | hub press surface of a press metal fitting, and the inner peripheral part of a boss | hub.

  Further, the connection fitting is preferably provided with a flange portion that is larger than the inner peripheral diameter of the boss of the resin liner and is in close contact with the inner surface of the mirror portion of the resin liner.

  The high-pressure gas container according to the present invention can prevent gas leakage caused by expansion of the gap between the boss and the base portion due to the deformation of the boss of the resin liner and the periphery thereof. Moreover, since the structure of the boss | hub of a resin liner and a nozzle | cap | die part is simple, it is excellent in ensuring quality, and it is preferable on manufacture and economically.

  Embodiments of a high-pressure gas container according to the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of a high-pressure gas container according to the present invention. FIG. 2 is a partially enlarged sectional view of FIG. As shown in FIG. 1, the high-pressure gas container 100 is inserted into an inner peripheral surface of a resin liner 10, a fiber reinforced layer 20 that reinforces the resin liner 10, and a boss 13 of the resin liner 10. And a base 30 to be connected. The base 30 includes a connection fitting 31 provided with a flange portion 33 that comes into contact with an end surface of the boss 13 on a shaft portion 32 inserted into the inner peripheral surface of the boss, and a boss outer peripheral surface and an end surface integrally with the connection fitting 31. And a pressing fitting 40 for pressing the.

  As shown in FIG. 3, the resin liner 10 has a known configuration of a body portion 11, a mirror portion 12, and a boss 13. In the present invention, a plurality of protruding ribs 14 are provided at equal intervals on the outer periphery of the boss 13. It is good to provide one. Thereby, the strength of the boss 13 can be improved and the rotation of the split ring 41 described below can be realized. In this example, the protruding ribs 14 are provided at two locations (180 ° intervals).

  The resin liner 10 is composed of a single-layer or multilayer synthetic resin layer having excellent gas barrier properties. As the material of the resin liner 10, various resins such as epoxy resin, polyamide resin, polyethylene terephthalate resin, ABS resin, polypropylene resin, and ethylene-vinyl alcohol copolymer can be used. Which resin is used is appropriately selected depending on the specifications of the high-pressure gas container.

  The fiber reinforced layer 20 is made of a so-called fiber reinforced resin, and is made by attaching a liquid resin of the same material as the resin used for the resin liner 10 to fibers such as carbon fiber, glass fiber yarn, polyaramid fiber, etc. Can be wound around the resin liner 10 and dried and solidified. Which material is used is appropriately selected depending on the specifications of the high-pressure gas container. As for the method of winding the fiber, either helical winding or a composite winding composed of helical winding and hoop (parallel) winding can be used.

  As described above, the base 30 is configured to include the connection fitting 31 including the shaft portion 32 and the flange portion 33 and the pressing fitting 40. As shown in FIG. 2, a gas hole 34 through which high-pressure gas is taken in and out is provided in the inner peripheral part of the shaft part 32 of the connection fitting 31, and a gas device such as a valve is connected to the gas hole 34. A connection screw 35 of a predetermined size is provided. Further, a seal ring groove 36 is provided on the outer peripheral portion of the shaft portion 32. In the seal ring groove, a seal ring 61 supported by a backup ring 62 is inserted, and a seal mechanism 60 for sealing a gap between the outer peripheral surface of the shaft portion 32 and the inner peripheral surface of the boss 13 is provided. Yes.

  The seal mechanism 60 is preferably provided on the inner peripheral portion of the boss 13 in the boss pressing surface 18 of the pressing fitting 40 indicated by the symbol M in FIG. The boss pressing surface 18 is firmly held by the fiber reinforced layer 20 and the pressing fitting 40, and a compression force is applied to the inside thereof, so that gas leakage due to expansion of the sealing portion can be prevented. A plurality of seal mechanisms 60 can be provided.

  As shown in FIG. 2, the flange portion 33 of the connection fitting 31 is provided with a required number of holes 37. As will be described below, a through hole for a locking bolt 39 for fixing the connection fitting 31 and the split ring 41. It has become. The hole 37 is preferably a long hole or a fool hole.

  As shown in FIG. 2, the pressing fitting 40 includes a split ring 41 and a nut 51, and a taper screw 43 provided on the outer peripheral surface of the split ring 41 and a taper screw 53 provided on the inner peripheral surface of the nut 51 are screwed. It comes to match. The split ring 41 is disposed between the protruding ribs 14 provided at equal intervals on the outer periphery of the boss 13, and the nut 51 is provided with a chamfered portion 55 for applying a spanner. The split ring 41 is provided with a screw 45 for the locking bolt 39 at a position corresponding to the hole 37.

  With such a configuration, the nut 51 can be tightened with a predetermined torque. As the nut 51 is tightened, the inner diameter of the split ring 41 is reduced, and the shaft portion 32 and the flange portion 33 of the connection fitting 31 and the split ring. 41 and the boss 13 are pressed from the outer periphery and the end portion, and a compressive force is applied to the boss 13. By this compressive force, expansion of the boss 13 can be suppressed and gas leakage can be prevented. Further, the hardness of the boss 13 can be increased and the sealing performance can be improved.

  The high-pressure gas container 100 is manufactured as follows. That is, first, the shaft portion 32 of the connection fitting 31 in which the seal ring 61 and the backup ring 62 are fitted is inserted into the inner peripheral surface of the boss 13 of the resin liner 10. Next, the split ring 41 is disposed between the ridge ribs 14 of the boss 13, the nut 51 is tightened with a predetermined torque, and then the connection fitting 31 and the split ring 41 are joined together by the locking bolt 39. Then, the fiber to which the resin is attached is wound around the resin liner 10 and the nut 51, and this is dried and solidified to form the fiber reinforced layer 20. As described above, the high-pressure gas container 100 is manufactured.

  The high-pressure gas container 100 according to the present invention has been described above. In the high-pressure gas container 100 according to the present invention, since the compressive force is applied to the boss 13 in advance, when the resin liner 10 expands with the gas pressure of the high-pressure gas filled in the high-pressure gas container, the boss portion is deformed. Is suppressed and gas leakage can be prevented. Further, the boss 13, the base 30, the coupling structure thereof, and the like of the high pressure gas container 100 have a simple structure, which is preferable in terms of quality assurance.

  The present invention is not limited to the above embodiments. For example, as in the high-pressure gas container 110 shown in FIG. In this case, it is preferable because the flange portion 15 can receive the force in the direction in which the base 30 generated by the high-pressure gas pops out from the boss 13. Further, as shown in FIG. 4, a sealing mechanism 65 is provided on the upper surface of the flange portion 15, and the airtightness can be improved by the sealing mechanisms 60 and 65. The seal mechanism 65 can also be provided on the end face of the boss 13 shown in FIG.

  Further, like the high-pressure gas container 120 shown in FIG. 5, a flange portion 38 can be provided at the lower end portion of the shaft portion 32 of the connection fitting 31. In this case, the flange portion 38 is preferably adhered to the inner surface portion of the mirror portion 12 of the resin liner 10 by adhesion or fusion. Thereby, airtightness can be improved. In addition, when providing the flange part 38 and providing the sealing mechanism 65, as shown in FIG. 5, the axial part 32 and the flange part 33 can be made into a split type.

It is a partial cross section figure of the high-pressure gas container concerning the present invention. It is the elements on larger scale of FIG. It is a partial sectional view of a resin liner. It is a partial cross section figure of the high-pressure gas container concerning other examples. It is a partial cross section figure of the high-pressure gas container concerning other examples.

Explanation of symbols

10 Resin liner
11 Torso
12 Mirror part
13 Boss
14 Ribs
15 Flange
18 Inside boss pressing surface
20 Fiber reinforced layer
30 base
31 Connection bracket
32 Shaft
33 Flange
34 Gas hole
35 Connection thread
36 Seal ring groove
37 holes
38 Flange
39 Retaining bolt
40 Press fitting
41 Split ring
43 Taper screw
45 screw
51 nut
53 Taper screw
55 Chamfer
60 Sealing mechanism
61 Seal ring
62 Backup ring
65 Sealing mechanism
100, 110, 120 high pressure gas containers

Claims (7)

A high-pressure gas container having a resin liner, a fiber reinforced layer that reinforces the resin liner, and a base that is inserted into the inner peripheral surface of the boss of the resin liner and connected to a gas device,
The base has a connection fitting provided with a flange portion in contact with the boss end surface at a shaft portion inserted into the inner peripheral surface of the boss, and a press for pressing the outer peripheral surface and end surface of the boss integrally with the connection fitting. A high-pressure gas container.   2. The high-pressure gas container according to claim 1, wherein the pressing fitting includes a split ring having a taper screw at an outer peripheral portion and a nut screwed into the split ring.   The high-pressure gas container according to claim 1 or 2, wherein the resin liner is provided with a plurality of protruding ribs at equal intervals on the outer periphery of the boss.   The high-pressure gas container according to any one of claims 1 to 3, wherein the resin liner is provided with a flange at an end of the boss.   The sealing mechanism is provided in the contact surface of the inner peripheral surface of the boss | hub of a resin liner, the axial part of a connection metal fitting, and / or the contact surface of the boss | hub end surface, and the flange part of a connection metal fitting. The high pressure gas container in any one of -4.   6. The high-pressure gas container according to claim 5, wherein the sealing mechanism is provided in a boss pressing surface of the pressing metal and on an inner peripheral portion of the boss.   The high-pressure gas according to any one of claims 1 to 6, wherein the connection fitting is provided with a flange portion that is larger than the inner peripheral diameter of the boss of the resin liner and is in close contact with the inner surface of the mirror portion of the resin liner. container.

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