Regenerative type refrigerator

Abstract

A disclosed regenerative type refrigerator includes a cylinder expanding a refrigerant gas; a regenerator accumulating cold thermal energy and being provided inside the cylinder so as to be reciprocate inside the cylinder; a rotary drive portion generating driving force; a rotary member being rotated by the rotary drive portion; and a bearing member supporting the rotary member and including an inner wheel, an outer wheel, and two sealing members encapsulating a lubricant agent and being provided on sides of the outer wheel and the inner wheel, wherein the sealing members are fixed to one of the inner wheel member and the outer wheel member, and a gap is formed between the two sealing members and another one of the inner wheel member and the outer wheel member.

1 . A regenerative type refrigerator comprising:
 a cylinder configured to expand a refrigerant gas;   a regenerator configured to accumulate cold thermal energy which is generated along with the expansion of the refrigerant gas, the regenerator being provided inside the cylinder so as to be reciprocate inside the cylinder and accommodating a regenerative material inside the regenerator;   a rotary drive portion configured to generate driving force for reciprocating the regenerator;   a rotary member configured to be rotated by the rotary drive portion; and   a bearing member configured to support the rotary member so that the rotary member is rotatable, the bearing member including an inner wheel, an outer wheel, and two sealing members, the inner wheel, the outer wheel and the two sealing members encapsulating a lubricant agent among the inner wheel, the outer wheel and the two sealing members, the outer wheel and the inner wheel being relatively and freely rotatable around a single rotational axis, the two sealing members being respectively provided on sides of the outer wheel and the inner wheel and arranged along the rotational axis,   wherein the two sealing members are fixed to one of the inner wheel member and the outer wheel member, and   a gap is formed between the two sealing members and another one of the inner wheel member and the outer wheel member.   
     
     
         2 . The regenerative type refrigerator according to  claim 1 ,
 wherein the two sealing members includes a portion made of a resin and facing the other one of the inner wheel member and the outer wheel member.   
     
     
         3 . The regenerative type refrigerator according to  claim 1 ,
 wherein the gap is 10 to 100 μm.   
     
     
         4 . The regenerative type refrigerator according to  claim 1 ,
 wherein the rotary member is a rotational shaft of the rotary drive portion.   
     
     
         5 . The regenerative type refrigerator according to  claim 1 , further comprising:
 a scotch yoke,   wherein the rotary member is a crank member,   wherein the scotch yoke converts rotary drive force of the crank member which is rotated to reciprocating drive force and reciprocating the displacer with the reciprocating drive force,   wherein the bearing member is provided in the scotch yoke.   
     
     
         6 . The regenerative type refrigerator according to  claim 1 , further comprising:
 a compressor configured to compress the refrigerant gas suctioned from the cylinder and discharge the compressed refrigerant gas to the cylinder,   wherein the rotary member is a rotary valve for switching connection of the cylinder to a suction side or a discharge side of the compressor.