US 11,854,737 B2
Detachable cryostat
Guangtong Ma, Chengdu (CN); Zhen Luo, Chengdu (CN); Xingchao Nie, Chengdu (CN); and Ruichen Wang, Chengdu (CN)
Assigned to Southwest Jiaotong University, Chengdu (CN)
Filed by Southwest Jiaotong University, Chengdu (CN)
Filed on Dec. 10, 2019, as Appl. No. 16/708,451.
Claims priority of application No. 201910790495.5 (CN), filed on Aug. 26, 2019.
Prior Publication US 2021/0065945 A1, Mar. 4, 2021
Int. Cl. H01F 6/04 (2006.01); F17C 3/08 (2006.01); H01F 6/00 (2006.01)
CPC H01F 6/04 (2013.01) [F17C 3/085 (2013.01); H01F 6/006 (2013.01); F17C 2203/03 (2013.01); F17C 2203/0643 (2013.01); F17C 2221/012 (2013.01); F17C 2221/014 (2013.01); F17C 2221/016 (2013.01); F17C 2221/017 (2013.01); F17C 2223/0161 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A detachable cryostat, comprising a cryocooler and a cryostat with a vacuum internal environment, wherein a first-stage cold chamber for containing a cryogen is placed in a first-stage radiation shield of the cryostat; wherein a circular sleeve and a first-stage bellows extending inwards are installed respectively at a top wall of the cryostat and a top wall of the first-stage cold chamber;
wherein a first lower conductive block connected to a top wall of the first-stage radiation shield is fixed at a middle portion of the circular sleeve; a bottom of the circular sleeve and a bottom of the first-stage bellows are respectively sealed with a second upper conductive block and a second lower conductive block, and the circular sleeve extends into the first-stage bellows when extended;
a first-stage cold head of the cryocooler is sleeved with a first upper conductive block matched with the first lower conductive block, and a second-stage cold head of the cryocooler is configured to drive the second upper conductive block to be matched with the second lower conductive block; the cryocooler is installed in the circular sleeve, and an upper end of the circular sleeve is fixed on a supporting device; and
when the supporting device is pressed, the first upper conductive block contacts the first lower conductive block, and the second lower conductive block contacts the second upper conductive block; when the supporting device is loosened, the first upper conductive block is separated from the first lower conductive block, and the second lower conductive block is separated from the second upper conductive block, wherein when the first-stage cold chamber is configured to place superconducting magnets, the detachable cryostat further comprises at least a pair of binary current leads fixed to a top end of the cryostat and extended into the first-stage cold chamber, and the at least a pair of binary current leads are connected to the first lower conductive block by copper braids and an insulating layer made of a conductive material for cooling when a second-stage cold chamber is taken out, and wherein the binary current lead comprises a superconducting current lead and a copper current lead, wherein the superconducting current lead and the copper current lead are detachable; the copper current lead is fixed to the cryostat through an installation adjustment mechanism, wherein the copper current lead contacts the superconducting current lead when the installation adjustment mechanism is pressed; and the copper current lead is separated from the superconducting current lead when the installation adjustment mechanism is loosened.