A method for manufacturing a high-pressure tank includes: forming a preform by winding a carbon fiber around a liner to form a fiber layer on an outer periphery of the liner; and impregnating the fiber layer of the preform with a curable resin and curing the curable resin. When winding the carbon fiber around the liner, a metal wire together with the carbon fiber is wound around the liner.

Disclosed is a pressure vessel for storing and keeping fluid and a three-dimensional shell structure used therefor. The pressure vessel has a shell structure in which an inner part is divided and partitioned into two sub volumes which are twisted with each other, by the interface and sub volumes are continuous, as a main body of the pressure vessel, and two sub volumes are independently utilized as a storage space of a high pressure vessel or a space for receiving or moving a heat exchange medium.

Disclosed is a pressure vessel for storing and keeping fluid and a three-dimensional shell structure used therefor. The pressure vessel has a shell structure in which an inner part is divided and partitioned into two sub volumes which are twisted with each other, by the interface and sub volumes are continuous, as a main body of the pressure vessel, and two sub volumes are independently utilized as a storage space of a high pressure vessel or a space for receiving or moving a heat exchange medium.

A constant pressure system includes a pressure vessel with a vapor-liquid mixture used to provide pressure forces instead of compressed air that is typically used. The vapor-liquid mixture can be a number of substances, such as nitrous oxide, so long as the mixture exists in both the liquid and vapor phases. Importantly, the vapor-liquid mixture must maintain a constant pressure during the dispensing of fluids from the tank, so that the fluids are dispensed at the same constant pressure. As a result, the fluids within the tank can be dispensed at the same pressure as that of the vapor-liquid mixture within the tank, or scaled to a higher or lower pressure value through the use of a pressure-converter valve within the system.

An accumulator vessel (10) includes a screwable portion (3) and a lid portion (2) that is positioned at an axially inner side of the screwable portion and an axially inner surface configures a pressure bearing plane. The lid portion includes a protruding portion (22) extending axially outward on an inner circumferential side, and the protruding portion configured to abut against an axially inner end side of the screwable portion to separate an axially inner surface of the screwable portion on an outer circumferential side thereof apart from an axially outer surface of the lid portion on an outer circumferential side thereof.

An accumulator vessel (10) includes a screwable portion (3) and a lid portion (2) that is positioned at an axially inner side of the screwable portion and an axially inner surface configures a pressure bearing plane. The lid portion includes a protruding portion (22) extending axially outward on an inner circumferential side, and the protruding portion configured to abut against an axially inner end side of the screwable portion to separate an axially inner surface of the screwable portion on an outer circumferential side thereof apart from an axially outer surface of the lid portion on an outer circumferential side thereof.

A pressure resistant device includes a tubular main body portion, a lid portion having a wall portion joined to the main body portion, a positioning portion provided to oppose an inner peripheral surfaces of the main body portion and the wall portion, and a groove portion formed on the inner peripheral surface, and the positioning portion is provided to oppose an edge of the groove portion.

A pressure resistant device includes a tubular main body portion, a lid portion having a wall portion joined to the main body portion, a positioning portion provided to oppose an inner peripheral surfaces of the main body portion and the wall portion, and a groove portion formed on the inner peripheral surface, and the positioning portion is provided to oppose an edge of the groove portion.

The present invention can ensure a large capacity while curbing enlargement of occupancy space or quality degradation due to unstable winding of a fiber-reinforced resin material. A pressure container (1) is provided with: a container body (2); and a cylindrical straight body part (10) and a hemispherical dome part (12) which are formed of an outer shell (3) made of a fiber-reinforced resin material, wherein, in a cross-section of the dome part (12) taken along the central axis of the straight body part (10), the shape of the outer surface (21) of the dome part (12) of the container body (2) is a curved shape that falls within the range of ellipse A and ellipse B when the outside diameter of the straight body part (10) of the container body (2) is defined as 2a. The ellipse A is an ellipse that satisfies b/a=0.55, where the major axis thereof is defined as a straight line k connecting boundary points p between the straight body part (10) and the outer surface (21) of the dome part (12) of the container body (2), the diameter along the major axis is defined as 2a, and the diameter along the minor axis is defined as 2b. The ellipse B is an ellipse that satisfies b/a=0.70, where the major axis thereof is defined as the straight line k, the diameter along the major axis is defined as 2a, and the diameter along the minor axis is defined as 2b.

The present invention can ensure a large capacity while curbing enlargement of occupancy space or quality degradation due to unstable winding of a fiber-reinforced resin material. A pressure container (1) is provided with: a container body (2); and a cylindrical straight body part (10) and a hemispherical dome part (12) which are formed of an outer shell (3) made of a fiber-reinforced resin material, wherein, in a cross-section of the dome part (12) taken along the central axis of the straight body part (10), the shape of the outer surface (21) of the dome part (12) of the container body (2) is a curved shape that falls within the range of ellipse A and ellipse B when the outside diameter of the straight body part (10) of the container body (2) is defined as 2a. The ellipse A is an ellipse that satisfies b/a=0.55, where the major axis thereof is defined as a straight line k connecting boundary points p between the straight body part (10) and the outer surface (21) of the dome part (12) of the container body (2), the diameter along the major axis is defined as 2a, and the diameter along the minor axis is defined as 2b. The ellipse B is an ellipse that satisfies b/a=0.70, where the major axis thereof is defined as the straight line k, the diameter along the major axis is defined as 2a, and the diameter along the minor axis is defined as 2b.