Cryogenic refrigerator

Abstract

A cryogenic refrigerator includes a pressure switching valve with a rotational element for switching between channels. The cryogenic refrigerator includes a first member located on one side in a direction of a rotational axis of the rotational element; a second member located on another side in the direction of the rotational axis of the rotational element; a bearing rotatably supporting the rotational element; and an elastic element. The first and second members sandwich the bearing via the elastic element.

What is claimed is: 
     
         1 . A cryogenic refrigerator comprising:
 a pressure switching valve with a rotational element for switching between channels;   a first member located on one side in a direction of a rotational axis of the rotational element;   a second member located on another side in the direction of the rotational axis of the rotational element;   a bearing rotatably supporting the rotational element; and   an elastic element, wherein   the first and second members sandwich the bearing therebetween via the elastic element.   
     
     
         2 . The cryogenic refrigerator as in  claim 1 , wherein the first and second members define a space for hermetically accommodating the rotational element. 
     
     
         3 . The cryogenic refrigerator as in claim  1 , wherein the second member defines a housing for accommodating the bearing and the elastic element therein,
 the first member defines a lid member for the housing, and   the elastic element is provided between the lid member and the bearing.   
     
     
         4 . The cryogenic refrigerator as in  claim 2 , wherein the second member defines a housing for accommodating the bearing and the elastic element therein,
 the first member defines a lid member for the housing, and   the elastic element is provided between the lid member and the bearing.   
     
     
         5 . The cryogenic refrigerator as in  claim 2 , wherein the elastic element is provided such that it contributes to hermeticity of the space between the first and second members. 
     
     
         6 . The cryogenic refrigerator as in  claim 3 , wherein the elastic element is provided such that it contributes to hermeticity of a space between the first and second members. 
     
     
         7 . The cryogenic refrigerator as in  claim 4 , wherein the elastic element is provided such that it contributes to hermeticity of the space between the first and second members.