Pressure vessel with boss attached liner

1. A pressure vessel comprising:

a boss tail portion comprising a boss extension portion having a cylindrical shape and a boss flange portion integrally expanding outward in a radial direction along a circumferential direction above the boss extension portion;

a liner portion having a container shape in which an accommodation space is formed to accommodate a fluid therein and a bottom is sealed and coupled, through integral insertion-injection molding, along a top surface of the boss flange portion; and

a composite cover portion provided to surround an outer surface of the liner portion and to have a bottom end sealed and coupled while surrounding a bottom surface of the boss flange portion and an outer surface of the boss extension portion.

2. The pressure vessel of claim 1 , wherein the boss flange portion comprises a recessed groove formed to be recessed downward from the top surface and a protruding edge portion extending and protruding upward while surrounding a periphery of the recessed groove,

wherein a liner extension portion extending radially inward along the top surface of the boss flange portion and having a bottom surface pressed against the top surface of the boss flange portion is primarily formed below the liner portion, and

wherein a sealing cover portion extending further from an inner end of the liner extension portion toward an outline of an inner surface corresponding to an outline of an outer surface of the protruding edge portion is secondarily formed.

3. The pressure vessel of claim 2 , wherein the boss flange portion comprises a filling-communication hole formed to pass through the protruding edge portion and to have an outer end communicating with an exterior of the protruding edge portion and an inner end communicating with an inner wall of the recessed groove, and

wherein the liner portion comprises a liner support portion formed on the filling-communication hole through insertion-injection molding, the liner support portion having an outer end integrally connected to an outer part of the sealing cover portion and an inner end integrally connected to an inner part of the sealing cover portion.

4. The pressure vessel of claim 2 , wherein a shape-matching and pressing groove surrounding a radial outside of the protruding edge portion and having a cross section with a diameter continuously increasing radially inward along a circumferential direction is formed at a top of the boss flange portion, and

wherein a shape-matching extension portion having a diameter gradually increasing from an inner end of the liner extension portion toward an end to be pressed against and shape-matched with the shape-matching and pressing groove is formed on a part of the liner portion facing the shape-matching and pressing groove along a circumferential direction.

5. The pressure vessel of claim 4 , wherein the boss flange portion comprises a sealing step formed to protrude from a top of the shape-matching and pressing groove radially outward along a circumferential direction, and

wherein the inner end of the liner extension portion is pressed against and shape-matched with an outer surface of the sealing step.

6. The pressure vessel of claim 1 , wherein a first tilted groove is formed in the top surface of the boss flange portion to be tilted radially inward in a downward direction and a second tilted groove spaced outward apart from the first tilted groove in a radial direction is formed to be recessed and tilted radially outward in the downward direction, and

wherein a first tilted protrusion and a second tilted protrusion which are inserted into and shape-matched with the first tilted groove and the second tilted groove, respectively, are formed on a bottom surface of a liner extension portion formed below the liner portion.

7. The pressure vessel of claim 1 , wherein a peripheral shape-matching groove having a cross section with a diameter continuously increasing radially inward along a circumferential direction is formed to be recessed from a radially outer end of the boss flange portion, and

wherein a peripheral shape-matching protrusion having a diameter increasing radially inward along a circumferential direction extends and protrudes from a top of the liner portion facing the peripheral shape-matching groove to be pressed against and shape-matched with the peripheral shape-matching groove.

8. A pressure vessel comprising:

a boss tail portion comprising a boss extension portion having a cylindrical shape and a boss flange portion integrally extending from a top of the boss extension portion radially outward along a circumferential direction and comprising a protruding edge portion having a top surface from which a recessed groove is recessed downward and extending and protruding upward while surrounding a periphery of the recessed groove and a filling-communication hole formed to pass through the protruding edge portion and having an outer end communicating with an exterior of the protruding edge portion and an inner end communicating with an inner wall of the recessed groove; and

a liner portion having a container shape in which an accommodation space is formed to accommodate a fluid therein, a liner extension portion having a bottom extending radially inward along a top surface of the boss flange portion and sealed and coupled through insertion-injection molding while a bottom surface is pressed against the top surface of the boss flange portion is primarily formed, a sealing cover portion further extending from an inner end of the liner extension portion toward an outline of an inner surface corresponding to an outline of an outer surface of the protruding edge portion is secondarily formed, and a liner support portion formed in the filling-communication hole through insertion-injection molding having an outer end integrally connected to an outer part of the sealing cover portion and an inner end integrally connected to an inner part of the sealing cover portion is formed.