Heat exchanger

Abstract

A heat exchanger includes: a heat exchange body through which a fluid serving as a cooled object passes; and a coolant passage which is provided in at least one of a central portion and an outer circumferential portion of the heat exchange body, and through which a coolant exchanging heat with the heat exchange body flows, wherein the heat exchange body includes: a first heat transfer means which extends from a central portion to an outer circumferential portion; and a second heat transfer means which extends in a circumferential direction, and which intersects the first heat transfer means, a heat transfer efficiency of the first heat transfer means is greater than that of the second heat transfer means.

1 . A heat exchanger comprising:
 a heat exchange body through which a fluid serving as a cooled object passes; and   a coolant passage which is provided in at least one of a central portion and an outer circumferential portion of the heat exchange body, and through which a coolant exchanging heat with the heat exchange body flows,   wherein   the heat exchange body includes:
 a first heat transfer portion which extends from the central portion to the outer circumferential portion; and 
 a second heat transfer portion which extends in a circumferential direction, and which intersects the first heat transfer portion, 
   a heat transfer efficiency of the first heat transfer portion moans is greater than that of the second heat transfer portion.   
     
     
         2 . The heat exchanger of  claim 1 , wherein
 the first heat transfer portion is first partition walls extending radially from the central portion to the outer circumferential portion of the heat exchange body,   the second heat transfer portion is second partition walls having a concentric shape,   a thickness of the first partition wall is larger than that of the second partition wall.   
     
     
         3 . The heat exchanger of  claim 1 , wherein
 the first heat transfer portion is first partition walls extending radially from the central portion to the outer circumferential portion of the heat exchange body,   the second heat transfer portion is second partition walls having a concentric shape,   a heat conductive property of a material of the first partition wall is greater than that of a material of the second partition wall.   
     
     
         4 . The heat exchanger of  claim 1 , wherein
 the first heat transfer portion is a first partition wall extending from an inlet side to an outlet side of the fluid serving as the cooled object in the heat exchange body,   the second heat transfer portion is a second partition wall extending from the inlet side to the outlet side of the fluid serving as the cooled object in the heat exchange body,   at least one of the first partition wall and the second partition wall includes a portion having a thickness becoming smaller from the inlet side to an outlet side.   
     
     
         5 . The heat exchanger of  claim 1 , wherein
 the first heat transfer portion is a first partition wall extending from an inlet side to an outlet side of the fluid serving as the cooled object in the heat exchange body,   the second heat transfer portion is a second partition wall extending from the inlet side to the outlet side of the fluid serving as the cooled object in the heat exchange body,   at least one of the first partition wall and the second partition wall includes a portion having a thickness becoming larger from the inlet side to an outlet side.