초록 ▼

The object of this invention is to provide a structure of seal ring, and seal structure using the seal ring for flange joints of composite tanks and pipes, that prevents seal surface variations due to differences in thermal contraction between the seal ring and the tank/the flange joint, etc., that

The object of this invention is to provide a structure of seal ring, and seal structure using the seal ring for flange joints of composite tanks and pipes, that prevents seal surface variations due to differences in thermal contraction between the seal ring and the tank/the flange joint, etc., that improves the resilience of the seal, and that prevents gas leakage due to poor sealing, in order to achieve the stable sealing. The seal ring fits into a ring groove formed in a sealed unit such as a tank unit or a flange joint to provide a tight seal to contain fluids. The heart-shaped seal ring has three curved surface areas that smoothly flow together, comprised of a first curved seal surface which contacts the formed surface of the ring groove, a second curved seal surface which contacts the seal surface of a second member (e.g. manhole cover), and a projecting curved surface on the opposite side. The foregoing seal ring is provided with a hollow cavity formed with the three curved surfaces of uniform thickness, and an indent that passes through from the hollow to the fluid introduction side.

대표청구항 ▼

1. A fluid seal structure sealing between a tank made of composite material including resin material, the tank including a fluid contained therein, and a cover covering an opening of the tank, comprising:a ring groove formed at a joint between adjoining faces of first and second joint members of the

1. A fluid seal structure sealing between a tank made of composite material including resin material, the tank including a fluid contained therein, and a cover covering an opening of the tank, comprising:a ring groove formed at a joint between adjoining faces of first and second joint members of the tank and cover, at least one of said first and second joint members being made from said resin material; anda seal ring which fits into said ring groove so as to provide a tight seal to contain fluids, said seal ring having a heart-shaped sectional shape and a hollow cavity and being made from resilient material having a greater low temperature contraction rate than that of said resin material;wherein said ring groove is provided in said first joint member;wherein said seal ring comprises:a first curved seal surface which makes contact with a bottom surface of said ring groove in said first joint member,a second curved seal surface which makes contact with said second joint member,first and second resilient curved surfaces which respectively curve from said first and second curved seal surfaces towards the inside of said hollow cavity and said heart-shaped sectional shape so as to provide an indent that forms the heart-shaped sectional shape, anda pair of opposing end surfaces respectively extending from said first and second resilient curved surfaces so as to form a gap between said pair of opposing end surfaces;wherein an outer circumference of said first and second resilient curved surfaces is structured so as to maintain contact with an inner side wall of said ring groove during low temperature contraction; andwherein a seal between the tank and cover is achieved by the cover covering the opening of the tank to seal the fluid in the tank from the outside with said first curved seal surface contacting with said bottom surface of said ring groove, said ring groove being provided in a sealing surface of the tank, and with said second curved seal surface contacting with a sealing surface of the cover facing the opening of the tank. 2. The fluid seal structure of claim 1, wherein said gap between said pair of opposing end surfaces is formed to a dimension that allows pressure contact of said first and second curved seal surfaces onto said opposing joint members when said opposing joint members are jointed. 3. The fluid seal structure of claim 1, wherein said seal ring further comprises an outward curved surface that is convex in a direction opposite to a fluid leakage path from the inside of the tank to the outside thereof between said opposing joint members, said outward curved surface connecting smoothly with said first and second curved seal surfaces. 4. The fluid seal structure of claim 1, wherein the cover is made of plastic material and the tank contains a low temperature fluid. 5. A fluid seal structure sealing in a flange joint between the flange joint and a cover covering an opening of the flange joint, comprising:a ring groove formed in the flange joint into which fluid can flow from inside of the flange joint and between adjoining faces of first and second joint members, at least one of said first and second joint members being made from a resin material; anda seal ring which fits into said ring groove so as to provide a tight seal to contain fluids, said seal ring having a heart-shaped sectional shape and a hollow cavity and being made from resilient material having a greater low temperature contraction rate than that of said resin material;wherein said ring groove is provided in said first joint member;wherein said seal ring comprises:a first curved seal surface which makes contact with a bottom surface of said ring groove in said first joint member,a second curved seal surface which makes contact with said second joint member,first and second resilient curved surfaces which respectively curve from said first and second curved seal surfaces towards the inside of said hollow cavity and said heart-shaped sectional shape so as to provide an indent that forms the heart-shaped sectional shape, anda pair of opposing end surfaces respectively extending from said first and second resilient curved surfaces so as to form a gap between said pair of opposing end surfaces;wherein an outer circumference of said first and second resilient curved surfaces is structured so that, during low temperature contraction, said first and second resilient curved surfaces maintain contact with an inner side wall of said ring groove. 6. The fluid seal structure of claim 5, wherein said first and second joint members form parts of a pipe. 7. The fluid seal structure of claim 5, wherein said first and second joint members form parts of a composite tank made from a fiber reinforced plastic material and containing a fluid.