Patent ID: 11879592
Assignee: TOKYO DENKI UNIVERSITY
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A gas pressure vessel configured to be filled with hydrogen gas, comprising:
a body part comprising a cylindrical part, a hemispherical dome part extended outward from an opening end of the cylindrical part, and a cylindrical neck part protruded outward from a periphery of an opening provided at a top of the dome part, the cylindrical part, the hemispherical dome part, and the cylindrical neck part being integrally formed as a single piece; and
a lid screwed into a female thread part formed on an inner peripheral surface of the neck part; and
an annular seal member configured to seal a gap between an inner peripheral surface of the opening of the dome part and an outer peripheral surface of the lid, wherein
the opening of the dome part has a diameter greater than 90 mm,
an innermost root of a thread in the female thread part is inward of an imaginary plane formed by extending an outer surface of the dome part toward the opening and is outward of an inner surface of the dome part,
an outermost root of the thread in the female thread part is outward of the imaginary plane formed by extending the outer surface of the dome part,
the seal member is inward of the innermost root of the thread in the female thread part and is outward of the inner surface of the dome part, and
the seal member is fitted into an annular groove formed in an inner edge of the outer peripheral surface of the lid,
wherein a step is formed between an outer side of the opening of the dome part and an inner side of the opening of the dome part by having a diameter of the outer side of the opening of the dome part being larger than a diameter of the inner side of the opening of the dome part, the step preventing lid movement, and
the seal member is inward of the step.