MULTI-CHANNEL ROTARY JOINT

摘要

A multi-channel rotary joint, wherein, between the opposed peripheral surfaces of a housing body (1) and a rotary shaft body (2) coupled thereto for free relative rotation, four or more mechanical seals (3) are provided that effect sealing using the relative rotational sliding contact action of opposed end faces (31a, 32a) of stationary sealing rings (32) provided on the housing body (1) and rotating sealing rings (31) provided on the rotary shaft body (2), and the joint has a single rotating sealing ring (31A) that does double duty as the rotating sealing rings (31, 31) for adjacent mechanical seals (3, 3). In this joint, coating layers (10a, 10a) made from a material with a higher heat transfer coefficient and hardness compared to the material of the double-duty rotating sealing ring (31A) are formed on both end faces (31a, 31a) of the rotating sealing ring (31A).

主权项

1. A multi-channel rotary joint in which,
between opposed peripheral surfaces of a tubular housing body and a rotary shaft body coupled thereto in a manner to make a relative rotation, four or more mechanical seals are provided,
which are adapted to effect sealing using relative rotational sliding contact action of sealing end faces that are opposed end faces of stationary seal rings provided on said housing body and rotary seal rings provided on the rotary shaft body, andwhich are arranged in a columnar configuration in a direction of a rotational axis of said two bodies,thus forming multiple passage connection spaces sealed by adjacent mechanical seals, said two bodies are formed therein fluid passages which are in communication through the passage connection spaces, and, a single rotary seal ring, both end faces of which are sealing end faces, is provided so as to do double duty as a rotary seal ring for at least one mechanical seal and as a rotary seal ring for a mechanical seal adjacent thereto, wherein: coating layers made from a material with a higher heat transfer coefficient and hardness compared to a material of said rotary seal ring are formed on both end faces of said double-duty rotary seal ring.