Cooling device

Abstract

A cooling device is made compact without impairing the desired cooling efficiency. A secondary cooling device ( 70 ) has a heat exchanging part ( 46 ) for condensing a vaporized coolant flowing in a condensation path ( 47 ) into a liquid coolant, and an evaporator (EP) arranged under the heat exchanging part ( 46 ) to vaporize the liquid coolant flowing in an evaporation pipe ( 52 ) into the vaporized coolant. The secondary cooling device ( 70 ) has a plurality of natural circulation circuits ( 72 ) independent of one another. In each natural circulation circuit ( 72 ), the liquid coolant flows down from the condensation path ( 47 ) of the heat exchanging part ( 46 ) to the evaporation pipe ( 52 ) of the evaporator (EP) through a liquid piping ( 48 ), and the vaporized coolant flows from the evaporation pipe ( 52 ) of the evaporator (EP) to the condensation path ( 47 ) of the heat exchanging part ( 46 ) through a gas piping ( 50 ).

1 . A cooling device including a heat exchanging part ( 46 ) for condensing a vaporized coolant flowing in a condensation path ( 47 ) into a liquid coolant, an evaporator (EP) arranged under the heat exchanging part ( 46 ) to vaporize the liquid coolant flowing in an evaporation path ( 52 ) into the vaporized coolant, and a natural circulation circuit ( 72 ) which permits the liquid coolant to flow down from the condensation path ( 47 ) of the heat exchanging part ( 46 ) to the evaporation path ( 52 ) of the evaporator (EP) through a liquid piping ( 48 ), and permits the vaporized coolant to flow from the evaporation path ( 52 ) of the evaporator (EP) to the condensation path ( 47 ) of the heat exchanging part ( 46 ) through a gas piping ( 50 ), characterized by
 including a plurality of natural circulation circuits ( 72 ) independent of one another.   
     
     
         2 . A cooling device including a heat exchanging part ( 46 ) for condensing a vaporized coolant flowing in a condensation path ( 47 ) into a liquid coolant, an evaporator (EP) arranged under the heat exchanging part ( 46 ) to vaporize the liquid coolant flowing in an evaporation path ( 52 ) into the vaporized coolant, and a natural circulation circuit ( 45 ) which permits the liquid coolant to flow down from the condensation path ( 47 ) of the heat exchanging part ( 46 ) to the evaporation path ( 52 ) of the evaporator (EP) through a liquid piping ( 48 ), and permits the vaporized coolant to flow from the evaporation path ( 52 ) of the evaporator (EP) to the condensation path ( 47 ) of the heat exchanging part ( 46 ) through a gas piping ( 50 ), characterized in that
 the natural circulation circuit ( 45 ) includes a plurality of evaporation paths ( 52 ), and condensation paths ( 47 ) equal in number to the evaporation paths ( 52 ), and   a liquid piping ( 48 ) connected to an outflow end ( 47   b ) of the condensation path ( 47 ) is connected to an evaporation path ( 52 ) different from an evaporation path ( 52 ) to which the gas piping ( 50 ) coupled to an inflow end ( 47   a ) of the condensation path ( 47 ) is connected, and the gas piping ( 50 ) connected to an outflow end ( 52   b ) of an evaporation path ( 52 ) is connected to a condensation path ( 47 ) different from a condensation path ( 47 ) to which the liquid piping ( 48 ) coupled to an inflow end ( 52   a ) of the evaporation path ( 52 ) is connected, thereby forming a single natural circulation circuit ( 45 ) as a whole.   
     
     
         3 . The cooling device according to  claim 1 , wherein one evaporator (EP) or a plurality of evaporators (EP) are provided for one heat exchanging part ( 46 ) or a plurality of heat exchanging parts ( 46 ). 
     
     
         4 . The cooling device according to  claim 1 , wherein the natural circulation circuit ( 45 ,  72 ) is thermally connected via the heat exchanging part ( 46 ) to a primary-side circuit ( 34 ) of a mechanical compression type which forcibly circulates a coolant. 
     
     
         5 . The cooling device according to  claim 2 , wherein one evaporator (EP) or a plurality of evaporators (EP) are provided for one heat exchanging part ( 46 ) or a plurality of heat exchanging parts ( 46 ). 
     
     
         6 . The cooling device according to  claim 2 , wherein the natural circulation circuit ( 45 ,  72 ) is thermally connected via the heat exchanging part ( 46 ) to a primary-side circuit ( 34 ) of a mechanical compression type which forcibly circulates a coolant.