Heat medium heating apparatus and vehicular air-conditioning system including the same

Abstract

Provided is a heat medium heating apparatus including: a plurality of flat heat exchanger tubes 12; PTC heaters 13 that are respectively incorporated between flat tube parts of the flat heat exchanger tubes 12; a heat exchanger holding member 15 that press-fixes the flat heat exchanger tubes 12 and the PTC heaters 13, from one side of the flat heat exchanger tubes 12 to an inner surface of a casing 11; and a control board 17 that has a surface on which a control circuit 21 is mounted, the control circuit 21 including heat-generating electrical components 20 that control the PTC heaters 13, in which the control board 17 includes heat penetration parts that are formed so as to pass through the control board 17 correspondingly to mounting positions of the heat-generating electrical components 20, and the heat-generating electrical components 20 are mounted so as to be cooled via the heat penetration parts.

1 . A heat medium heating apparatus comprising:
 a plurality of flat heat exchanger tubes each including an inlet header part, a flat tube part, and an outlet header part, the flat heat exchanger tubes each allowing a heat medium to flow thereinto through the inlet header part, circulate through the flat tube part, and then flow to an outside thereof through the outlet header part;   PTC heaters that are respectively incorporated between the flat tube parts of the flat heat exchanger tubes stacked on each other;   a heat exchanger holding member that presses the flat heat exchanger tubes and the PTC heaters alternately stacked on each other, from one side of the flat heat exchanger tubes toward an inner surface of a casing, to thereby bring the flat heat exchanger tubes and the PTC heaters into close contact with each other; and   a control board that has a surface on which a control circuit is mounted, the control circuit including a heat-generating electrical component that controls the PTC heaters, wherein   the control board includes a heat penetration part that is formed so as to pass through the control board correspondingly to a mounting position of the heat-generating electrical component, the heat penetration part being made of a highly thermally conductive material, and   the heat-generating electrical component is mounted so as to be cooled via the heat penetration part.   
     
     
         2 . The head medium heating apparatus according to  claim 1 ,
 wherein the control board is placed above the heat exchanger holding member, and   
       wherein the heat-generating electrical component is mounted so as to be cooled via the heat penetration part by the heat exchanger holding member functioning as a heat sink. 
     
     
         3 . The heat medium heating apparatus according to  claim 1 , wherein
 the heat exchanger holding member is made of an aluminum alloy plate.   
     
     
         4 . The heat medium heating apparatus according to  claim 1 , wherein
 a spacer member is interposed between the heat exchanger holding member and the heat penetration part of the control board, the spacer member being made of a highly thermally conductive material and having a predetermined thickness.   
     
     
         5 . The heat medium heating apparatus according to  claim 1 , wherein
 a plurality of terminal blocks are arranged along one side of a surface of the control board, and   a plurality of terminals extending from one ends of electrode plates provided on both surfaces of the PTC heaters are respectively connectable directly to the terminal blocks.   
     
     
         6 . The heat medium heating apparatus according to  claim 1 , wherein
 the flat heat exchanger tubes and the PTC heaters in an alternately stacked state are fastened to an inner bottom surface of the casing by the heat exchanger holding member, the casing including a heat medium inlet and a heat medium outlet respectively communicated with the inlet header part and the outlet header part.   
     
     
         7 . A vehicular air-conditioning system comprising:
 a heat medium heating apparatus;   a heat radiator placed in an air flow passage through which a heat medium heated by the heat medium heating apparatus circulates, wherein the heat medium heating apparatus comprising:   a plurality of flat heat exchanger tubes each including an inlet header part, a flat tube part, and an outlet header part, the flat heat exchanger tubes each allowing a heat medium to flow thereinto through the inlet header part, circulate through the flat tube part, and then flow to an outside thereof through the outlet header part;   PTC heaters that are respectively incorporated between the flat tube parts of the flat heat exchanger tubes stacked on each other;   a heat exchanger holding member that presses the flat heat exchanger tubes and the PTC heaters alternately stacked on each other, from one side of the flat heat exchanger tubes toward an inner surface of a casing, to thereby bring the flat heat exchanger tubes and the PTC heaters into close contact with each other; and   a control board that has a surface on which a control circuit is mounted, the control circuit including a heat-generating electrical component that controls the PTC heaters, wherein   the control board includes a heat penetration part that is formed so as to pass through the control board correspondingly to a mounting position of the heat-generating electrical component, the heat penetration part being made of a highly thermally conductive material, and   the heat-generating electrical component is mounted so as to be cooled via the heat penetration part.   
     
     
         8 . The vehicular air-conditioning system according to  claim 7 ,
 wherein the control board is placed above the heat exchanger holding member, and   wherein the heat-generating electrical component is mounted so as to be cooled via the heat penetration part by the heat exchanger holding member functioning as a heat sink.