Stirling cooler

Abstract

A Stirling cooler includes a Stirling refrigerator having a heat dissipation unit and a heat absorption unit, a cooling compartment cooled by cold heat of the heat absorption unit, a secondary refrigerant circulation circuit cooling the heat dissipation unit, and a tertiary refrigerant circulation circuit exchanging heat with the secondary refrigerant circulation circuit.

1 . A Stirling cooler comprising:
 a Stirling refrigerator having a heat dissipation unit and a heat absorption unit;   a cooling compartment cooled by cold heat of said heat absorption unit;   a secondary refrigerant circulation circuit cooling said heat dissipation unit; and   a tertiary refrigerant circulation circuit exchanging heat with said secondary refrigerant circulation circuit.   
   
   
       2 . The Stirling cooler according to  claim 1 , further comprising a circulation pump conveying a tertiary refrigerant having exchanged heat with a secondary refrigerant of said secondary refrigerant circulation circuit to an object to be heated. 
   
   
       3 . The Stirling cooler according to  claim 2 , wherein
 said object to be heated includes at least one of an opening of said Stirling cooler and a drain water heating unit.   
   
   
       4 . The Stirling cooler according to  claim 1 , wherein
 said tertiary refrigerant circulation circuit has its internal pressure set at or higher than atmospheric pressure.   
   
   
       5 . The Stirling cooler according to  claim 1 , wherein
 said secondary refrigerant circulation circuit includes   an evaporator cooling said heat dissipation unit,   a heat exchanger exchanging heat between said secondary refrigerant and said tertiary refrigerant, and   a condenser cooling said secondary refrigerant, and   said heat exchanger is disposed downstream of said evaporator with respect to direction in which said secondary refrigerant flows, and said condenser is disposed further downstream thereof.   
   
   
       6 . The Stirling cooler according to  claim 1 , wherein
 heat exchange between said secondary refrigerant circulation circuit and said tertiary refrigerant circulation circuit is performed by a dual pipe heat exchanger.   
   
   
       7 . The Stirling cooler according to  claim 6 , wherein
 said secondary refrigerant and said tertiary refrigerant flow in respective directions opposite to each other in said dual pipe heat exchanger.   
   
   
       8 . The Stirling cooler according to  claim 1 , further comprising an evaporator evaporating said secondary refrigerant and cooling said heat dissipation unit, wherein
 said heat exchanger is disposed in said evaporator.