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

Claim 5:
6. The rotary joint according to claim 5,
wherein a third inner flow passage serving as a supply flow passage that supplies a liquid into the shaft body from the outside is formed in the shaft body to open on an outer circumferential side,
a third outer flow passage serving as a discharge flow passage that discharges a liquid from the inside of the case body to the outside is formed in the case body to open on an inner circumferential side,
the plurality of mechanical seals includes a mechanical seal that forms a third intermediate flow passage connecting the third outer flow passage and the third inner flow passage to each other in the annular space to configure a third fluid passage, and
the third inner flow passage is open at a position on an upper side of the opening of the first inner flow passage in the axial direction in the shaft body.