Cooling device

Abstract

A cooling device includes a case including a mount surface having a power transistor mounted thereon, a coolant accommodating chamber formed in the case located above the mount surface, for accommodating a coolant capable of evaporating by heat from the power transistor, a cooling pipe provided in the case and being capable of cooling the coolant in a gaseous state, and a defining member provided in the coolant accommodating chamber and being capable of defining in the coolant accommodating chamber a first region capable of guiding the coolant in a gaseous state evaporated by the heat from the power transistor toward the cooling pipe, and a second region located downstream in a flow direction of the coolant with respect to the first region and being capable of guiding the coolant cooled by the cooling pipe toward a bottom of the coolant accommodating chamber.

1 . A cooling device comprising:
 a case including a mount part having an object to be cooled mounted thereon;   a coolant accommodating chamber formed in said case located above said mount part, for accommodating a coolant capable of evaporating by heat from said object to be cooled;   a cooling part provided in said case and being capable of cooling said coolant in a gaseous state; and   a defining member provided in said coolant accommodating chamber and being capable of defining in said coolant accommodating chamber a first region capable of guiding said coolant in a gaseous state evaporated by the heat from said object to be cooled toward said cooling part, and a second region located downstream in a flow direction of said coolant with respect to said first region and being capable of guiding said coolant cooled by said cooling part toward a bottom of said coolant accommodating chamber,   said defining member including a wall portion extending from a side of the bottom of said coolant accommodating chamber to reach a central portion in a height direction of said coolant accommodating chamber, and a swelling portion provided on an upper end portion of said wall portion and having a curved surface.   
   
   
       2 . (canceled) 
   
   
       3 . The cooling device according to  claim 1 , wherein
 an inner surface of said case defining said coolant accommodating chamber includes the bottom projecting toward said object to be cooled, and is formed such that a distance between the inner surface of said case defining said coolant accommodating chamber and said mount part is reduced toward said bottom.   
   
   
       4 . The cooling device according to  claim 1 , wherein
 a plurality of said defining members are provided at a distance from one another.   
   
   
       5 . The cooling device according to  claim 1 , wherein
 said defining member is provided in a position at a distance in a width direction of said object to be cooled from a central portion in the width direction of said object to be cooled.   
   
   
       6 . The cooling device according to  claim 1 , wherein
 the bottom of said coolant accommodating chamber is partitioned by said defining member into a first storage part located upstream in the flow direction of said coolant in a gaseous state in said first region, for storing said coolant that evaporates by the heat from said object to be cooled, and a second storage part located downstream in the flow direction of said coolant in a gaseous state in said second region, for storing said coolant in a liquid state condensed by said cooling part, and   said defining member includes a flow portion capable of guiding said coolant in said second storage part to said first storage part.   
   
   
       7 . The cooling device according to  claim 1 , wherein
 said cooling part includes a cooling fin provided in said coolant accommodating chamber, said cooling fin being provided on an upper end portion of said defining member, and   said coolant is cooled by said cooling fin while flowing in said flow direction, and flows toward inside of said second region.   
   
   
       8 . The cooling device according to  claim 7 , wherein
 said cooling part includes a cooling pipe through which a cooling medium capable of cooling heat from said cooling fin flows, and   said cooling pipe includes a branch portion reaching inside said cooling fin.