A rotary joint for maintaining a cryogenic supplying refrigerant comprises a vacuum use cylindrical shaft supported in rotatable condition, a rotary seal ring fitted to an outer circumferential face with a space, a stationary seal ring provided at both sides of the respective rotary seal rings, a re
A rotary joint for maintaining a cryogenic supplying refrigerant comprises a vacuum use cylindrical shaft supported in rotatable condition, a rotary seal ring fitted to an outer circumferential face with a space, a stationary seal ring provided at both sides of the respective rotary seal rings, a resilient bellows to press the stationary ring resiliently to the rotary seal ring side, a spaced fluid passage formed between the respective resilient bellows, a second fluid passage communicating with the spaced fluid passage, a connecting fluid passage communicating with the second fluid passage, a first pipe communicating through the spaced fluid passage, a connecting cover having a suction bore for vacuumizing and a magnetic fluid seal device having a projection constituted as multiple gaps corresponding to a pressure of the vacuumizing.
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1. A rotary joint for a refrigerant configured to connect fluid passages between a refrigerant supplying apparatus on a stationary side and a cooling portion on a rotary side, comprising: a vacuum use cylindrical shaft supported by a main body in rotatable condition, and having a vacuum passage pene
1. A rotary joint for a refrigerant configured to connect fluid passages between a refrigerant supplying apparatus on a stationary side and a cooling portion on a rotary side, comprising: a vacuum use cylindrical shaft supported by a main body in rotatable condition, and having a vacuum passage penetrating into the vacuum use cylindrical shaft in an axial direction, a coupling portion at one end of said vacuum passage for communicating said vacuum passage with said cooling portion, an opening at another end of said vacuum passage for vacuum suction, and a connecting portion at a middle of said coupling portion and said opening;a first set of seal rings and resilient bellows including a rotary seal ring rotating with said vacuum use cylindrical shaft, a pair of stationary seal rings and a pair of resilient bellows;said rotary seal ring hermetically fitted to said connecting portion of said vacuum use cylindrical shaft, and having seal faces which are circumferential surfaces provided at both end portions of said rotary seal ring in the axial direction;said pair of stationary seal rings provided on both sides in an axial direction of said rotary seal ring, and having counter seal faces respectively contacting hermetically with said seal faces facing thereto; andsaid pair of resilient bellows for pressing said stationary seal rings resiliently to said seal faces, and respectively having a joint portion and a fixed portion, said joint portion being provided at one end of said resilient bellows and being connected hermetically with an opposite face from said counter seal face of said stationary ring, said fixed portion being provided at another end of said resilient bellows, enclosing said vacuum use cylindrical shaft, and being fixed to said main body;a first spaced fluid passage formed between said pair of resilient bellows and on an outer side of said rotary seal ring and said pair of stationary seal rings and communicated with a first fluid passage to introduce a supplying refrigerant;a second fluid passage penetrating through said rotary seal ring in a radial direction and communicated with said first spaced fluid passage;a connecting fluid passage provided in said connecting portion, communicated with said second fluid passage at one end of said connecting fluid passage, and having a connecting bore at another end of said connecting fluid passage;a first pipe arranged in said vacuum passage of said vacuum use cylindrical shaft, and having a fluid passage connected with said connecting bore at one end of said fluid passage to be communicated with said connecting fluid passage and communicated with said cooling portion at another end of said fluid passage;a coupling cover having a suction bore for exerting vacuum suction on an inside of said vacuum passage through said opening of said vacuum use cylindrical shaft, anda magnetic fluid seal device having a magnetic fluid seal cover, pole blocks, magnets, a shaft cover, and magnetic fluid, in which, said magnetic fluid seal cover is hermetically coupled with said coupling cover to enclose said vacuum use cylindrical shaft,said pole blocks are for magnets, are arranged in parallel, and are hermetically fitted on one circumferential face of an inner circumferential face of said magnetic fluid seal cover or an outer circumferential face of said vacuum use cylindrical shaft,said magnets are arranged in spaces between said pole blocks arranged in parallel,said shaft cover has a projection group in which a plurality of projections are arranged in a manner that said respective projections are close to and facing circumferential faces of said respective pole blocks and are fitted on another circumferential face of an inner circumferential face of said magnetic fluid seal cover or an outer circumferential face of said vacuum use cylindrical shaft,said magnetic fluid existing between said projections and said pole blocks, andwherein a magnetic force generated by said magnets, pole blocks, and projections is exerted on said magnetic fluid, and said magnetic fluid exists between said projections and said pole blocks to close a space between said projections and said pole blocks to maintain a vacuum condition of a suction space. 2. The rotary joint as set forth in claim 1, further comprising a second set of seal rings and resilient bellows including a second rotary seal ring, a second pair of stationary seal rings and a second pair of resilient bellows so that the rotary joint includes two sets of seal rings and resilient bellows as a whole, wherein said two sets of said rotary seal rings and said stationary rings of both sides of said rotary seal ring are arranged in the axial direction, a second spaced fluid passage is provided between adjacent stationary seal rings of one set and the other set of said two sets, said second spaced fluid passage communicates with a second pipe arranged in said vacuum passage of said vacuum use cylindrical shaft, so that a discharging refrigerant after cooling said cooling portion is returned back through said second pipe and said second spaced fluid passage. 3. The rotary joint as set forth in claim 1, wherein an inner circumferential portion of said connecting portion is formed as a circular face, an oval face, a convex-concave face or a toothed gear shape face along the circumferential direction. 4. The rotary joint as set forth in claim 1, wherein said rotary seal ring comprises a plurality of said second fluid passages arranged along the circumferential direction, said connecting portion comprises said connecting fluid passages along the circumferential direction which communicate with said respective second fluid passages, and said fluid passages of respective said first pipes communicate with said connecting fluid passages respectively corresponding to said first pipe. 5. The rotary joint as set forth in claim 1, wherein the counter seal face slidably engages the seal face. 6. The rotary joint as set forth in claim 1, wherein said pair of resilient bellows elastically presses said stationary seal rings to said seal faces.
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이 특허에 인용된 특허 (2)
Laskaris Evangelos T. (Schenectady NY), Cryogenic fluid transfer joint employing a stepped bayonet relative-motion gap.
Urdshals Karl A. B. (Singapore SGX) Hvide Hans J. (Singapore SGX) Hooper Alan G. (Singapore SGX), Single point mooring system employing a submerged buoy and a vessel mounted fluid swivel.
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