A pipe coupling structure, configured to prevent formation of a gap between the inner peripheral surfaces of pipe elements connected together through which gap a fluid being transported may enter, includes first and second pipe elements to be connected together. The first pipe element has a first sealing portion with an acute angle defined by a first inner peripheral surface defining a hole of the first pipe element and a first annular surface extending radially outward from an end edge of the first inner peripheral surface. The second pipe element has a second sealing portion defined by a second inner peripheral surface defining a hole of the second pipe element and a second annular surface extending radially outward from an end edge of the second inner peripheral surface. The first and second pipe elements are connected together, with the first and second end edges abutted against each other.
[Problem] To provide a pipe joint structure for which a gap that would enable the infiltration of a fluid being transported between the inner circumferential surfaces of coupled pipe elements is not generated. [Solution] A pipe joint structure having a first and a second pipe element which are coupled to each other. The first pipe element has a first sharp-angled seal part, which is defined by a first inner circumferential surface (defining the hole of the first pipe element) and a first annular surface that extends radially outward from an end edge (a first end edge) of the first pipe element, and the second pipe element has a second seal part, which is defined by a second inner circumferential surface (defining the hole of the second pipe element) and a second annular surface that extends radially outward from an end edge (a second end edge) of the second pipe element. The first and second pipe elements are coupled to each other by bringing the first end edge and the second end edge into contact with each other.
F16L 23/16 - Flanged joints characterised by the sealing means
F16L 23/036 - Flanged joints the flanges being connected by members tensioned axially characterised by the tensioning members, e.g. specially adapted bolts or C-clamps
A metal seal ring by which conduits are hermetically engaged by a pressure in accordance with a fluid pressure. The metal seal ring is comprised of a first annular seal surface, a second annular seal surface a pressure receiving surface which is formed between a first and second seal surfaces and which defines an annular recessed portion, and an annular seal portion comprised of a first seal portion and a second seal portion which are both elastically deformable and both formed between the annular recessed portion and the second seal surface. Additionally, an annular seal ring main body is provided on the radially outer side of the seal portion to prevent the first and second flanges from moving closer to the metal seal ring in the axial direction.
F16J 15/08 - Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
F16L 17/025 - Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket the sealing rings having radially directed ribs
F16L 23/20 - Flanged joints characterised by the sealing means the sealing means being rings made exclusively of metal
4.
METAL SEAL RING AND CONDUIT DEVICE USING METAL SEAL RING
Disclosed is a metal seal ring set between first and second elements such as duct end flanges to seal therebetween. The metal seal includes an annular sealing member and an annular seal ring body provided on the radially outside of the sealing member. The annular sealing member includes annular first and second sealing surfaces to be engaged with the first and second elements, respectively, and an annular pressure receiving surface provided therebetween and defining an annular depression opening radially inward of the metal seal ring. Annular first and second sealing portions are defined by the annular depression and the first and second sealing surfaces. The annular seal ring body is configured to engage the first and second element when the metal seal ring is clamped by the first and second elements to prevent the first and second sealing portions from being excessively deformed.
Disclosed is a metal seal ring by which conduits are hermetically engaged by a pressure in accordance with a fluid pressure. The metal seal ring is comprised of a first annular seal surface (12a) configured so as to be in contact with a first flange, a second annular seal surface (12b) configured so as to be in contact with a second flange, a pressure receiving surface (12f) which is formed between the first and second seal surfaces and which defines an annular recessed portion (12e) which is radially inwardly open, and an annular seal portion (12) comprised of a first seal portion (12A) which is elastically deformable and formed between the annular recessed portion (12e) and the first seal surface (12a) and a second seal portion (12B) which is elastically deformable and formed between the annular recessed portion (12e) and the second seal surface (12b). An annular seal ring main body (14) which is engaged with the first and second flanges to prevent the first and second flanges from moving closer to the metal seal ring in the axial direction and prevent an excessive force from being applied to the first and second seal portions, is provided on the radially outer side of the seal portion (12). The first and second seal portions (12A, 12B) are respectively pressed against the first and second flanges due to the fluid pressure received by the pressure receiving surface.
A method of joining metal tubes to each other without welding. In the method, a first circular conical surface (10) tapered toward its front end and a first annular recessed surface (18) at the rear of the first circular conical surface are formed on the outer peripheral surface of a front end portion of a first tube (1). A second circular conical surface (26) tapered from its front end toward its rear and a second annular recessed surface (28) contiguous to the second circular conical surface are formed on the inner peripheral surface of a front end portion of a second tube (2). The front end portion of the first tube is inserted into the front end portion of the second tube, and the first tube is pressed in its axial direction while the first circular conical surface (10) is caused to slide on the second circular conical surface (26). As a result, the first tube is press-fitted into the second tube, causing the first circular conical surface (10) to go beyond the second circular conical surface (26) to be fitted to the second annular recessed surface (28). Thus, the first and second tubes are joined to each other with a sealing engagement portion formed between the first and second tubes.
F16L 25/00 - Construction or details of pipe joints not provided for in, or of interest apart from, groups
F16L 13/00 - Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
F16L 23/024 - Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
F16L 23/026 - Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes by welding
F16L 23/028 - Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes the flanges being held against a shoulder
An O-ring-equipped metal packing having excellent durability and air tight-sealing performance. The metal packing is formed by combining an annular metal packing (4) and an O-ring (2). The metal packing (4) has an annular sealing section (26) placed in a space between recesses (20) formed in opposite faces of flanges (10). The sealing section has a pair of annular slope surfaces (28) sealed against inner peripheral-side edges (22) of the opposite recesses (20). Each slope surface is adapted such that the normal line to the slope surface and the axis of the flanges forms an angle of 45 degrees plus/minus 8 degrees. The sealing section (26) has a support surface (32) facing radially outward and supporting the O-ring (2). The O-ring (20) supported by the support surface is sealed against outer peripheral-side recess edges (24) of the recesses (20).
patents
