Receptacles – High-pressure-gas tank
Reexamination Certificate
2000-03-21
2001-05-08
Pollard, Steven (Department: 3727)
Receptacles
High-pressure-gas tank
C220S588000, C220S589000, C220S661000
Reexamination Certificate
active
06227402
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pressure container for filling up various kinds of compressed gas such as a compressed natural gas (CNG) and the like, various kinds of liquefied gas such as a liquefied natural gas (LNG), a liquefied petroleum gas (LPG) and the like, and the other various kinds of pressurizing materials.
2. Description of the Related Art
There has been conventionally known a pressure container
50
for the CNG in which a metal mouth piece
52
is mounted to a polyethylene liner
51
which does not transmit the CNG and outer peripheries of the liner
51
and the mouth piece
52
are coated with an FRP reinforcing layer
53
which satisfies a predetermined pressure resistance standard, as shown in FIG.
7
. In the pressure container
50
, since a main body portion is kept in an air tight state by the synthetic resin liner
51
, there is an advantage that a weight of a vehicle can be reduced in the case of being used as a fuel tank or the like for an automotive vehicle. Further, in order to keep the mouth piece mounting portion in an air tight state, the structure is made such that a coating portion
51
a
for coating the mouth piece
52
from an inner side is provided in the liner
51
, thereby pressure contacting the coating portion
51
a
to an inner surface of a boss portion
52
a
and a flange portion
52
b
in the mouth piece
52
by a gas pressure.
However, a coefficient of thermal expansion is greater in the polyethylene liner
51
than the metal mouth piece
52
, so that the polyethylene liner
51
is contracted and expanded in accordance with a change of temperature in a relatively greater manner. Accordingly, for example, as shown in
FIG. 8
, the liner
51
is contracted at a low temperature, the coating portion
51
a
is peeled from the mouth piece
52
and a gap
54
is generated between the both, thereby causing a poor seal. Further, there is a case that a crack is generated in the coating portion
51
a
due to a residual stress caused by a contraction of the liner
51
at a time of forming and a repeated stress caused by a contraction and expansion of the liner
51
in accordance with a change of temperature. As mentioned above, it is not said that the conventional pressure container
50
is perfect in a reliability of an airtight seal in a bonding portion between the liner
51
and the mouth piece
52
.
SUMMARY OF THE INVENTION
Then, an object of the present invention is to provide a pressure container which can improve a reliability of an airtight seal in a bonding portion between a liner and a mouth piece.
In order to achieve the object, in accordance with the present invention, there is provided a pressure container comprising:
a mouth piece having a cylindrical boss portion and a flange portion which is protruded from an outer periphery of the boss portion; and
a synthetic resin liner which is integrally formed in the flange portion,
wherein an annular groove to which an inner peripheral portion of an edge portion of the liner is fitted so as to slide in a direction of expanding a diameter is provided on an inner side surface or an outer side surface of the flange portion.
An aspect by which the inner peripheral portion of the edge portion of the liner is fitted to the annular groove so as to slide in the direction of expanding the diameter is not specifically limited, however, the following aspects can be exemplified.
(1) An aspect in which the annular groove is formed in such a manner as to come nearer a center of the mouth piece toward a bottom of the groove, and the inner peripheral portion of the edge portion of the liner is formed so as to coincide with a shape of the annular groove.
(2) An aspect in which the annular groove is formed in an inclined manner so that a bottom side of the groove comes nearer a center of the mouth piece and enters in a direction of a thickness of the flange portion, and the inner peripheral portion of the edge portion of the liner is formed in an inclined shape by being bent so as to coincide with the annular groove.
An angle of incline of the annular groove is not specifically limited, however, it is preferable that the annular groove is inclined at an angle between 10 and 80 degrees with respect to the inner side surface or the outer side surface of the flange portion, and an angle between 20 and 50 degrees is more preferable. It is hard to form the annular groove in the case that the angle of incline is smaller than 10 degrees, and it is hard for the inner peripheral portion of the edge portion to slide from the annular groove when the liner is contracted and expanded in the case that it is greater than 80 degrees, whereby a breaking is easily generated in the bent portion in a side of a base end of the inner peripheral portion due to a stress concentration. Further, it is easier to process the annular groove when the angle of incline is greater than 20 degrees, and it is harder that the stress is concentrated in the bent portion when it is smaller than 50 degrees.
A cross sectional shape of the annular groove is not specifically limited as far as the inner peripheral portion of the edge portion is formed in a slidable shape, and there can be exemplified a shape in which both side walls of the annular groove are parallel to each other and a shape in which a width of the wall in the side of an opening (an inlet) of the both side walls is increased.
A depth of the annular groove is not specifically limited, however, it is preferable to set the depth to a depth at which the fitting is not taken out even when the liner is contracted and the inner peripheral portion of the edge portion is slid.
The flange portion is preferably structured such that a rubber coat is tightly formed on a contact surface with the liner.
In accordance with the pressure container of the present invention, it is possible to improve a reliability of an airtight seal in the bonding portion between the liner and the mouth piece.
In accordance with the pressure container in which the rubber coat is formed on the contact surface of the flange portion with the liner, it is possible to further improve the effect.
REFERENCES:
patent: 4589563 (1986-05-01), Born
patent: 4690295 (1987-09-01), Wills
patent: 5253778 (1993-10-01), Sirosh
patent: 5287988 (1994-02-01), Murray
patent: 5429845 (1995-07-01), Newhouse et al.
patent: 5476189 (1995-12-01), Duvall et al.
patent: 5518141 (1996-05-01), Newhouse et al.
patent: 5551590 (1996-09-01), Mazur et al.
patent: 5979692 (1999-11-01), West
patent: 11-99818 (1999-04-01), None
Iriyama Yojiro
Shimojima Shingo
Pillsbury & Winthrop LLP
Pollard Steven
Toyoda Gosei Co., Ltd
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