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

Claim 3:
4. The rotary joint according to claim 3,
wherein the first intermediate flow passage includes
a first annular flow passage formed using some of the plurality of mechanical seals in the annular space to communicate with the opening of the first outer flow passage,
a second annular flow passage formed using some other mechanical seals among the plurality of mechanical seals in the annular space to communicate with the opening of the first inner flow passage, and
a connecting flow passage connecting the first annular flow passage and the second annular flow passage to each other, and
the connecting flow passage includes
a third annular flow passage formed using the mechanical seal forming the plurality of second inner flow passages between the first annular flow passage and the second annular flow passage of the annular space, and
a plurality of flow passage holes formed in the case body to connect the first annular flow passage and the second annular flow passage through the third annular flow passage.