Abstract: Each of mechanical seal devices 7 of a rotary joint 1 includes a first shaft side seal ring 71 and a second shaft side seal ring 72 attached to a shaft body 5, and a first case side seal ring 73 and a second case side seal ring 74 attached to a case body 2. The first shaft side seal ring 71 and the second shaft side seal ring 72 have contact surfaces 71b and 72b axially facing each other and coming into contact with each other, and grooves 421c and 421d for forming a second communication flow passage 42 connecting a second outer flow passage 32 and a second inner flow passage 62 are formed in both the contact surfaces 71b and 72b.

Abstract: Each of the mechanical seal devices of a rotary joint includes a first shaft side seal ring attached to a shaft body and a first case slide seal ring attached to one side of the first shaft side seal ring as well as a second case side seal ring attached to a case body and a second shaft side seal ring attached to the second case side seal ring. A first communication flow passage is formed between a first sliding portion of the first seal rings and a second sliding portion of the second seal rings. A second communication flow passage is formed between the first sliding portion of a mechanical seal device disposed on one side in the axial direction and the second sliding portion of a mechanical seal device disposed on the other side in the axial direction in mechanical seal devices adjacent to each other.

Abstract: Each of mechanical seal devices 7 of a rotary joint 1 includes a first shaft side seal ring 71 and a second shaft side seal ring 72 attached to a shaft body 5, and a first case side seal ring 73 and a second case side seal ring 74 attached to a case body 2. The first shaft side seal ring 71 and the second shaft side seal ring 72 have contact surfaces 71b and 72b axially facing each other and coming into contact with each other, and grooves 421c and 421d for forming a second communication flow passage 42 connecting a second outer flow passage 32 and a second inner flow passage 62 are formed in both the contact surfaces 71b and 72b.

Abstract: Each of mechanical seal devices of a rotary joint includes a seal ring and a seal ring attached to a shaft body, and a seal ring and a seal ring attached to a case body. A flow passage that partitions an annular space and connects a flow passage and a flow passage is formed between a sliding portion of the seal rings and a sliding portion of the seal rings. A flow passage that partitions the annular space and connects a flow passage and a flow passage is formed between the sliding portion of a mechanical seal device disposed on one side in the axial direction and the sliding portion of a mechanical seal device disposed on the other side in the axial direction in mechanical seal devices adjacent to each other in the axial direction.