Patent ID: 11953137
Assignee: NIPPON PILLAR PACKING CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 2:
3. The rotary joint according to claim 1,
wherein a plurality of second outer flow passages is formed in the axial direction in the case body,
the same number of second inner flow passages as the number of second outer flow passages are formed in the shaft body,
the plurality of mechanical seals includes a mechanical seal that forms the second intermediate flow passage connecting the second outer flow passages and the second inner flow passages one by one in the annular space to configure a plurality of second fluid passages,
the first outer flow passage and the first inner flow passage are open at mutually different positions in the axial direction with the plurality of second intermediate flow passages interposed therebetween, and
the first intermediate flow passage is formed such that a liquid flowing through the first intermediate flow passage lubricates first and second sealing surfaces of the mechanical seal forming the plurality of second intermediate flow passages.