JPH1113995A - Socket structure of pressure container of plastic liner frp(fiber reinforced plastics) - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a socket structure of a pressure container of plastic liners FRP(fiber reinforced plastics) which is so comparatively simple in structure that a sealing member can be replaced with ease, and is also excellent in airtightness. SOLUTION: A base 1 is formed out of an inner side socket fixture 3 where a female screw 8 is formed in the inner circumferential surface of a through hole 7 at the center part, and a retaining flange 6 is also formed at its one end, and of a metallic accessory 4 for mounting a valve, concurrently, its center circumferential surface is covered with the mouth part 20 of a plastic liner in such a way that the flange side of the inner side socket fixture 3 is disposed in the inside of the mouth part 20 of the plastic liner 17, furthermore, its outer circumferential surface is covered with a FRP helical layer 18, meanwhile, elastic sealing material 14 is interposed between the tip end of the sheathing layer 21 for the mouth part of the plastic liner and the metallic accessory 4 for mounting the valve so as to allow the socket to comprise the metallic accessory 4 threadedly engaged with the female screw 8 of the inner side socket fixture 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base structure of a plastic liner FRP pressure vessel, and more particularly to a pressure vessel for fuel such as liquefied petroleum gas (LPG) and a medical / disaster prevention vessel such as an air respirator. The present invention relates to a base structure of an FRP pressure vessel using a plastic liner, which is adopted in (1).

[0002]

2. Description of the Related Art Steel containers have been mainly used as fuel and medical / disaster prevention pressure vessels. However, steel containers are heavy, and since these containers are often transported and used, weight reduction has been strongly desired. As a solution to this need, FRP (fiber reinforced plastic) containers have been developed. As the first FRP container, a container in which the outside of an aluminum alloy liner was reinforced with FRP was developed. This container has 1
/ 3 to 1/2 weight reduction. However, there is a problem that the cost for manufacturing the aluminum alloy liner is slightly high. For this reason, recently, the liner is molded from plastic which can be manufactured relatively inexpensively, and the outside thereof is formed by FRP.
A plastic liner FRP container reinforced with the above has been developed. This plastic liner FRP container has almost the same light weight (1/3 to 1/2 of the steel container weight) as the aluminum alloy liner FRP container, and the aluminum alloy liner FR
Less expensive than P containers.

[0003] The plastic liner FRP pressure vessel, for example, as shown in FIG.
1, FRP helical layer 32, FRP hoop layer 33, and base 3
Consists of four. Plastic liner 31 is usually
It is manufactured by a blow molding method, a rotational molding method, or the like. Also, FRP
The helical layer 32 and the FRP hoop layer 33 are formed by a filament winding method (FW method). Specifically, a filament formed by impregnating a fiber bundle (a bundle of thousands of fibers) with a resin and forming into a thread shape is sequentially wound around a plastic liner 31 while applying tension, and is formed.

Since it is necessary to attach accessories such as a pressure gauge and a metal valve to the plastic liner FRP pressure vessel after the vessel is completed, a metal base 34 made of steel or aluminum alloy is usually provided at the mouth 35 of the vessel. Is attached. As shown in FIG. 6, the mounting structure of the earliest is formed by first molding the plastic liner 31 and then fitting the cylindrical liner 35 of the liner 31 to the outer peripheral shape of the liner. The metal base 34 is fitted, and the metal base 34 is wound around the FRP helical layer 32 and fixed.

[0005] Also, the most recent plastic liner F
As the base structure of the RP container, for example, JP-A-6-42698
Is proposed in Japanese Patent Publication No. As shown in FIG. 7 (corresponding to FIG. 4 in the same publication), the metal cap 42 is insert-molded and the flange 43 of the metal cap 42 is inserted into the plastic liner 41 as shown in FIG. It is embedded between the upper lip 44 and the lower lip 45 forming the liner opening. Thereafter, the FRP helical layer 46 is wound around the metal base 42 so as to surround it.

[0006]

One of the important roles that the base structure of the plastic liner FRP pressure vessel described above should play is to hermetically seal the gas in the vessel. Normally, glass fiber reinforced plastic (GFRP) is used as the FRP forming the helical layer or the hoop layer. However, since the GFRP layer is not airtight, any of the cap structures shown in FIGS. Also, if a gap (a gap through which gas can pass) is generated even in a part between the contact surfaces of the plastic liners 31, 41 and the metal bases 34, 42, the gas in the container leaks to the outside. In the case of the conventional mouthpiece structure shown in FIGS. 6 and 7, even if there is no gap as described above immediately after the production of the container, the valve is repeatedly attached and detached, the container is repeatedly filled with gas, and the vibration during use / transport. In some cases, a gap may be gradually formed due to repetition of a temperature change, and there is a problem in the airtightness of the container.

To solve the above-mentioned problem, FIG.
As shown in the figure, plastic liner 51 and metal base 52
In some cases, a rubber sheet 53 is sandwiched at the boundary of the container, and the sheet is wrapped around with a FRP helical layer 54 to improve airtightness. Repeated gas filling, vibration during use and transportation, repeated temperature changes, etc.
Deteriorates, and the sealing property of the rubber sheet 53 decreases,
Again, the gas in the container sometimes leaked to the outside. Furthermore,
Since such a rubber sheet 53 is pressed and hardened from the outside by the FRP helical layer 54, it cannot be replaced even if it has deteriorated, and cannot be repaired and reused. Become.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a plastic liner FRP which can be easily replaced with a relatively simple structure and has excellent airtightness. An object of the present invention is to provide a base structure for a high-pressure container.

[0009]

In order to achieve the above object, a base structure of a plastic liner FRP high-pressure container according to the present invention is characterized in that the base is formed with a female screw on the inner peripheral surface of a through hole at the center and An inner fitting having a flange for retaining at one end and a metal accessory for mounting a valve, and an outer peripheral surface of the inner fitting having a flange side arranged in a mouth of a plastic liner. Is covered with a plastic liner opening and the outer peripheral surface thereof is further covered with an FRP helical layer, and an elastic sealing material is interposed between the tip of the coating layer of the plastic liner opening and the metal fitting for valve mounting. At least, a metal accessory for mounting the valve is screwed into the female screw of the inner fitting.

The above plastic liner FRP
In the base structure of the pressure vessel, the outer surface of the plastic liner may be formed with a rough surface having irregularities.

Further, in the above-mentioned base structure of the plastic liner FRP pressure vessel, after covering the outer peripheral surface of the inner die with the plastic liner opening, the outer die is attached to the outer peripheral surface, and the outer peripheral surface of the outer die is provided. FRP
It may be covered with a helical layer. In this case, the inner and outer peripheral surfaces of the outer fitting may be formed with a rough surface having irregularities.

Further, in the base structure of the plastic liner FRP pressure vessel, the elastic sealing material may be an O-ring. Further, a rough surface having irregularities may be formed on at least the outer peripheral surface of the body portion of the inner metal fitting.

In the present invention, the outer peripheral surface of the inner fitting is covered with the plastic liner opening so that the flange side is disposed in the opening of the plastic liner.
Further, since the outer peripheral surface is covered with the FRP helical layer, the inner peripheral surface of the plastic liner is pressed against the outer peripheral surface of the inner fitting, so that the airtightness between the contact surfaces is increased. Moreover,
Since an elastic sealing material is interposed between the tip of the coating layer at the mouth of the plastic liner and the metal fitting for mounting the valve, the metal fitting for mounting the valve is screwed into the female screw of the inner fitting. Even if the airtightness between the contact surfaces becomes abnormal, the airtightness is maintained by the elastic sealing material, and there is no fear that the gas in the container leaks to the outside. In addition, the elastic sealing material is simply placed at the tip of the coating layer at the mouth of the plastic liner when attaching the metal accessories for mounting the valve to the inner fitting, so it is easy to replace when deteriorated. In addition, the life of the pressure vessel can be improved.
As the elastic sealing material, a commercially available O-ring may be used, and if the O-ring is used, it is economical in cost.

Further, after covering the outer peripheral surface of the inner metal fitting with the plastic liner orifice, it is preferable to attach the outer metal fitting to the outer circumferential surface and cover the outer circumferential surface of the outer metal fitting with the FRP helical layer. By attaching the plastic liner opening so as to be sandwiched between the inner fitting and the outer fitting, the airtightness can be further improved, the above-mentioned effects can be more effectively enjoyed, and the plastic liner opening can be protected. The effect can be expected. In this case, it is preferable that the outer fitting is attached by tightening or tightening.

Further, by forming the outer surface of the plastic liner with a rough surface having irregularities, the plastic liner and the F
The adhesion to the RP layer can be enhanced, and the plastic liner can be prevented from running idle in the FRP layer. In addition, by forming at least the outer peripheral surface of the body of the inner metal fitting and the inner and outer peripheral surfaces of the outer metal fitting with a roughened surface, the gap between the outer peripheral surface of the inner metal fitting and the plastic liner, and between the plastic liner and the outer metal fitting. Of the outer fitting and the FRP helical layer can be prevented.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory sectional view of a base structure of a plastic liner FRP pressure vessel according to the present invention. In the drawing, reference numeral 1 denotes a base, and 2 denotes a plastic liner FRP pressure vessel.

The base 1 comprises an inner base 3 and a metal accessory 4 for mounting a valve. The inner base 3 has a body 5 having a circular cross section and a flange 6 formed at a lower portion of the body 5.
And a through hole 7 is formed at the center thereof, and a female screw 8 is formed on the inner peripheral surface of the through hole 7. The metal attachment 4 for mounting a valve has an outer shape formed in two steps of a large-diameter portion 9 and a small-diameter portion 10.
A through hole 12 is formed at the center, and a connection screw 13 (for example, a screw for connecting a valve, a pressure gauge, or the like) is formed in the large diameter portion 9 side of the through hole 12. .
Further, an O-ring 14 is provided on the lower end surface of the step portion of the large diameter portion 9 and the small diameter portion 10.
The inner wall of the outer wall 16 of the groove 15 is formed to have a larger diameter than the outer diameter of the body 5 of the inner fitting 3. Then, the male screw 1 is formed by screwing the male screw 11 of the metal attachment 4 for mounting the valve into the female screw 8 of the inner metal fitting 3.

Plastic liner FRP pressure vessel 2
Is the FRP helical layer outside the plastic liner 17
18 and the FRP hoop layer 19 are laminated, an opening (mouth) 20 is formed in a part thereof, and the base 1 is attached.

The structure for attaching the base 1 to the mouth 20 is as follows.
First, the inner metal fitting 3 is disposed with the flange 6 side in the mouth portion 20, and a coating layer 21 made of a plastic liner 17 is formed on the outer peripheral surface of the body portion 5 in close contact with the outer peripheral surface of the coating layer 21. , So that the coating layer 21 is pressed against the outer peripheral surface of the body 5.
After forming the RP helical layer 18 and mounting the inner fitting 3 in the mouth 20, the metal fitting 4 for mounting the valve, in which the O-ring 14 is mounted in the groove 15, is connected to the male screw 11 of the small diameter part 10. Into the female screw 8 of the inner fitting 3. At this time, the diameter of the O-ring 14 is larger than the outer diameter of the body 5, and is arranged in the groove 15 so as to be in contact with the upper end surface of the coating layer 21.

Therefore, since the base structure of the FRP high-pressure container according to the present invention is constructed as described above, the upper end surface of the coating layer 21 formed of the plastic liner 17 formed in close contact with the body 5 of the inner base 3 is formed. An O-ring 14 is interposed between the large-diameter portion 9 and the lower end surface of the large-diameter portion 9 of the metal fitting 4 for mounting the valve, and the metal fitting 4 for mounting the valve is attached to the inner fitting 3.
Even if the airtightness is abnormal between the contact surfaces of the body 5 and the coating layer 21, the airtightness is maintained by the O-ring 14, and there is no fear that the gas in the container leaks to the outside.
The O-ring 14 is used to cover the opening 20 when the metal fitting 4 for mounting a valve is mounted on the inner fitting 3.
Since it is simply disposed and mounted on the upper end surface of the pressure switch 21, it can be easily replaced when deteriorated, and the life of the pressure vessel can be improved.

FIG. 2 is an explanatory sectional view of another embodiment of the base structure of the plastic liner FRP pressure vessel according to the present invention. In this embodiment, an outer fitting 22 shown in FIG. 3 is provided on the outer periphery of a coating layer 21 made of a plastic liner 17 constituting the opening 20 shown in FIG. Except that the surface is covered with the FRP helical layer 18, the structure is basically the same as that of the above-described embodiment, and the outer fitting 22 slightly covers the coating layer 21 between the inner fitting 3 and the inner fitting 3. It has a body 23 with a circular cross section and a flange 24 formed at the lower part of the body 23, and an opening 25 is formed through the body 23 and the flange 24 so that it can be tightened with a bolt and nut 26 Is configured.

Accordingly, the F according to the present invention shown in FIGS.
In the base structure of the RP high-pressure container, the body 5 of the inner base 3
After forming the coating layer 21 by the plastic liner 17 in close contact with the outer layer 22, the outer fitting 22 is attached to the outer periphery of the coating layer 21, the bolt and nut 26 are tightened, and the opening 25 is closed. The coating layer 21 can be attached by being slightly pressed between the base member 23 and the body part 5 of the inner base 3, so that the airtightness is further improved and the operation and effect of the embodiment shown in FIG. In addition, the outer fitting 22 has a protective function of preventing the coating layer 21 from being damaged.

In the above-described embodiment, an example in which one opening 25 of the outer fitting 22 is provided has been described.
It may be divided into pieces.

In the above embodiment, the case where the outer surface of the plastic liner 17 is smooth has been described as an example.
The outer surface may be formed with an uneven rough surface. By forming the rough surface, friction resistance between the outer FRP helical layer 18 and resistance to rotation can be increased. An idle rotation in the FRP helical layer 18 can be prevented.

Further, in the above embodiment, the case where the outer peripheral surface of the torso 5 is smooth is used as the torso 5 of the inner base 3 as shown in FIG. 4, but as shown in FIG. Knurling on the outer peripheral surface of the flange 6, and / or
Alternatively, a notch groove 28 may be formed by processing such as cutting, and by forming such a rough surface, the gap between the outer peripheral surface of the inner metal fitting 3 and the inner peripheral surface of the coating layer 21 by the plastic liner 17 is formed. Friction resistance and resistance to rotation can be increased, whereby the inner fitting 3 can be prevented from idling in the coating layer 21 due to the torque action when the valve or the like is attached.

An adhesive may be interposed between the body 5 of the inner base 3 and the covering layer 21 of the mouth 20. For example, the inner base 3 is formed of an aluminum alloy, and the liner is formed of polyethylene. In this case, epoxy resin, polyvinyl ether, acrylic resin, polyamide resin, nitrile phenolic, nitrile rubber and the like can be suitably used as the resin which adheres well to both.

Further, the case where the inner and outer peripheral surfaces of the outer fitting 22 are smooth is taken as an example. However, the present invention is not limited to this example, and irregularities and the like are formed on the inner and outer peripheral surfaces by knurling. The outer peripheral surface may have a flat portion formed like a spanner on the body portion 23 as shown in FIG. With such a surface, the frictional resistance between the inner peripheral surface of the outer fitting 22 and the outer peripheral surface of the coating layer 21 by the plastic liner 17 and the outer circumferential surface of the outer fitting 22 and the inner peripheral surface of the FRP helical layer 18 are set. , Which can increase the resistance to rotation, thereby preventing the outer fitting 22 from idling and, at the same time, more effectively reducing the plastic liner.
17 can be prevented from spinning inside the FRP helical layer 18.

[0028]

As described above, if the base structure of the plastic liner FRP pressure vessel according to the present invention is used,
Since the outer peripheral surface of the inner fitting is covered with the plastic liner opening and the outer peripheral surface is further covered with the FRP helical layer, the inner peripheral surface of the plastic liner is pressed and adhered to the outer peripheral surface of the inner fitting. Therefore, the airtightness between the contact surfaces is increased, and an elastic sealing material (such as an O-ring) is interposed between the tip of the coating layer at the opening of the plastic liner and the metal accessory for mounting the valve. Since the accessory is screwed into the female screw of the inner fitting, even if the airtightness between the contact surfaces becomes abnormal, the airtightness is maintained by the elastic sealing material, and the gas in the container leaks to the outside. Don't worry. In addition, the elastic sealing material is simply placed at the tip of the coating layer at the mouth of the plastic liner when attaching the metal accessories for mounting the valve to the inner fitting, so it is easy to replace when deteriorated. Thus, the life of the pressure vessel can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a base structure of a plastic liner FRP pressure vessel according to the present invention.

FIG. 2 is an explanatory cross-sectional view of another embodiment of the base structure of the plastic liner FRP pressure vessel according to the present invention.

FIG. 3 is a top view of the outer fitting according to the present invention.

FIG. 4 is an explanatory view of an inner fitting according to the present invention,
Is a perspective view of the case where the body is made rough, and b is a case where the flange is made rough.

FIG. 5 is a perspective view of another embodiment of the outer fitting according to the present invention.

FIG. 6 is an explanatory sectional view of a base structure of a conventional FRP pressure vessel.

FIG. 7 is an explanatory sectional view of a base structure of another conventional FRP pressure vessel.

FIG. 8 is an explanatory sectional view of a base structure of another conventional FRP pressure vessel.

[Explanation of symbols]

1: Base 2: Plastic liner F
RP pressure vessel 3: Inside fitting 4: Metal accessory for valve installation 5: Body 6: Flange
7: Through hole 8: Female screw 9: Large diameter part 1
0: Small diameter part 11: Male screw 12: Through hole 1
3: Connection screw 14: O-ring 15: O-ring mounting groove 1
6: Exterior wall 17: Plastic liner 1
8: FRP helical layer 19: FRP hoop layer 20: Opening (mouth) 2
1: Cover layer 22: Outer fitting 23: Body 2
4: Flange 25: Opening 26: Bolt / nut 2
7: Unevenness 28: Notch groove

Claims (6)

[Claims] 1. A base comprising an inner base having a female screw formed on an inner peripheral surface of a through hole at a center portion and a flange for preventing a stopper from being formed at one end, and a metal fitting for mounting a valve. The outer peripheral surface is covered with the plastic liner opening so that the flange side of the inner metal fitting is disposed in the opening of the plastic liner, and the outer peripheral surface is further covered with the FRP helical layer. An elastic sealing material is interposed between the tip of the coating layer and the metal fitting for mounting the valve, and the metal fitting for mounting the valve is screwed into the female screw of the inner fitting. Plastic liner FRP
Pressure vessel base structure. 2. The base structure of a plastic liner FRP pressure vessel according to claim 1, wherein the outer surface of the plastic liner is formed with a rough surface having irregularities. 3. The base structure for a plastic liner FRP pressure vessel according to claim 1, wherein the outer peripheral surface of the inner die is covered with a plastic liner opening, and then the outer die is attached to the outer peripheral surface. A base structure of a plastic liner FRP pressure vessel in which an outer peripheral surface of a base is covered with an FRP helical layer. 4. The base structure for a plastic liner FRP pressure vessel according to claim 1, wherein the elastic sealing material is an O-ring. 5. The base structure of a plastic liner FRP pressure vessel according to claim 1, wherein a rough surface having irregularities is formed on at least the outer peripheral surface of the body portion of the inner base. 6. The plastic liner F according to claim 3,
A base structure of a plastic liner FRP pressure container in which an inner / outer peripheral surface of an outer base is formed with a rough surface having irregularities.