ROTARY JOINT

• Main Authors: KIKUYAMA Yoshinori, FUKUMOTO Takato
• Format: Patent
• Language: English
• Published: 08.09.2016
• Subjects: BLASTING; CYLINDERS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PIPES; PISTONS; SEALINGS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; WEAPONS

A mechanical seal which defines an annular space formed between a case body and a shaft body is included. The mechanical seal includes: a first sealing ring 11 having a first seal surface; a second sealing ring having a second seal surface which slidably contacts with the first seal surface; and a plurality of coil springs provided along the first sealing ring 11 in a circumferential direction and configured to apply axial forces to the first sealing ring 11 to press the first seal surface against the second seal surface. The plurality of coil springs are divided into a plurality of groups, and first regions K1 in each of which occurring distortion is increased by the axial forces of the coil springs that belong to the group and second regions K2 in each of which distortion is smaller than that in each first region K1 are present alternately along the circumferential direction in the first sealing ring 11.