US2012234023A1PendingUtilityA1

Cryogenic refrigerator

39
Assignee: MIZUNO YOJIPriority: Mar 17, 2011Filed: Mar 15, 2012Published: Sep 20, 2012
Est. expiryMar 17, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Yoji Mizuno
F25B 9/00F25B 9/14F25B 2500/01F16C 23/043F16C 33/201
39
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Claims

Abstract

A cryogenic refrigerator according to an embodiment of the present invention is used in cooling a superconducting magnet. The cryogenic refrigerator includes a crankpin bearing of a scotch yoke. The crankpin bearing is made of a cylindrical nonmagnetic resin material. The crankpin bearing includes a cylindrical inner wall and a cylindrical outer wall. The cylindrical inner wall supports a crankpin. The crankpin is eccentrically attached to an output shaft of a motor slidably in a circumferential direction. The cylindrical outer wall contacts with an inner wall of a window portion of the scotch yoke. The cylindrical inner wall is made of another nonmagnetic resin material different from the nonmagnetic resin material of the cylindrical outer wall. Hardness of the cylindrical inner wall is higher than hardness of the cylindrical outer wall.

Claims

exact text as granted — not AI-modified
1 . A cryogenic refrigerator used in cooling a superconducting magnet, comprising a crankpin bearing of a scotch yoke, wherein the crankpin bearing is made of a cylindrical nonmagnetic resin material, and includes
 a cylindrical inner wall supporting a crankpin eccentrically attached to an output shaft of a motor slidably in a circumferential direction and   a cylindrical outer wall contacting with an inner wall of a window portion of the scotch yoke.   
     
     
         2 . The cryogenic refrigerator as claimed in  claim 1 , wherein the cylindrical inner wall is made of another nonmagnetic resin material different from the nonmagnetic resin material of the cylindrical outer wall. 
     
     
         3 . The cryogenic refrigerator as claimed in  claim 2 , wherein hardness of the cylindrical inner wall is higher than hardness of the cylindrical outer wall. 
     
     
         4 . The cryogenic refrigerator as claimed in  claim 1 , wherein a contour of the cylindrical outer wall is convex, if the crankpin bearing is viewed from a lateral direction. 
     
     
         5 . The cryogenic refrigerator as claimed in  claim 2 , wherein a contour of the cylindrical outer wall is convex, if the crankpin bearing is viewed from a lateral direction. 
     
     
         6 . The cryogenic refrigerator as claimed in  claim 3 , wherein a contour of the cylindrical outer wall is convex, if the crankpin bearing is viewed from a lateral direction. 
     
     
         7 . The cryogenic refrigerator as claimed in  claim 4 , wherein the contour is represented by an arc. 
     
     
         8 . The cryogenic refrigerator as claimed in  claim 5 , wherein the contour is represented by an arc. 
     
     
         9 . The cryogenic refrigerator as claimed in  claim 6 , wherein the contour is represented by an arc. 
     
     
         10 . The cryogenic refrigerator as claimed in  claim 4 , wherein the contour includes a linear portion. 
     
     
         11 . The cryogenic refrigerator as claimed in  claim 5 , wherein the contour includes a linear portion. 
     
     
         12 . The cryogenic refrigerator as claimed in  claim 6 , wherein the contour includes a linear portion.

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