Stirling refrigerator

Abstract

Provided is a Stirling refrigerator having enhanced cooling capacity through improving exhaust-heat efficiency of the electromagnetic reciprocating drive mechanism. The Stirling refrigerator includes: a casing having a cylindrical portion and a body portion; a cylinder provided with a mount housed within the casing, the mount formed of a metal exhibiting high thermal conductivity; a piston and a displacer housed in the cylinder in a reciprocable manner; a stator of an electromagnetic reciprocating drive mechanism, the stator held on the mount and arranged within the body portion; and a mover of the electromagnetic reciprocating drive mechanism, the mover connected to the piston. The casing is partially formed with a heat-conduction block formed of a metal exhibiting favorable thermal conductivity thermally in contact with the mount. A heat generated at a compression chamber and an electromagnetic reciprocating drive mechanism can be efficiently released to the outside of the casing.

What is claimed: 
     
         1 . A Stirling refrigerator comprising:
 a casing having a cylindrical portion and a body portion;   a cylinder that is housed within said casing and provided with a mount formed of a metal exhibiting a high thermal conductivity;   a piston and a displacer that are housed in said cylinder in a reciprocable manner; and   an electromagnetic reciprocating drive mechanism having a stator and a mover, said stator being held on said mount and arranged within said body portion, while said mover being connected to said piston,   wherein said casing is partially formed with a heat-conduction block formed of a metal exhibiting a high thermal conductivity, and said heat-conduction block is thermally in contact with said mount.   
     
     
         2 . The Stirling refrigerator according to  claim 1 , wherein said heat-conduction block is provided on an outside of a compression chamber defined between said piston and said displacer. 
     
     
         3 . The Stirling refrigerator according to  claim 2 , further comprising at least one through-hole formed on said body portion, wherein a heat pipe or a thermosiphon is inserted through said through-hole into said body portion, and a gap defined between said through-hole and said heat pipe or said thermosiphon is sealed. 
     
     
         4 . The Stirling refrigerator according to  claim 1 , further comprising a compression chamber defined between said piston and said displacer in a manner being surrounded by said mount. 
     
     
         5 . The Stirling refrigerator according to  claim 4 , wherein said heat-conduction block is provided on an outside of said compression chamber. 
     
     
         6 . The Stirling refrigerator according to  claim 3 , wherein said heat pipe or said thermosiphon comprises: a basal portion arranged in parallel with an axial direction of said piston; and an arm portion protruded horizontally toward an outside of said casing. 
     
     
         7 . The Stirling refrigerator according to  claim 6 , wherein said basal portion is arranged in a position opposed to said electromagnetic reciprocating drive mechanism. 
     
     
         8 . The Stirling refrigerator according to  claim 3 , further comprising a plurality of connecting arms at a lower surface of an outer circumference of said mount, said connecting arms protruding downwardly in a direction substantially parallel with an axial direction of said cylinder. 
     
     
         9 . The Stirling refrigerator according to  claim 8 , wherein said heat pipe or said thermosiphon is arranged in between the plurality of connecting arms. 
     
     
         10 . The Stirling refrigerator according to  claim 8 , wherein said heat pipe or said thermosiphon is arranged adjacent to each of the plurality of connecting arms. 
     
     
         11 . The Stirling refrigerator according to  claim 1 , further comprising a heat dissipating fin in contact with said heat-conduction block, wherein said compression chamber is in communication with said heat dissipating fin.