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

Abstract

Provided is a heat medium heating apparatus, which can reduce the thermal contact resistance between flat heat exchanger tubes and PTC heaters, improve the heat transfer performance, efficiently cool and control heat-generating electrical components on a board of the the PTC heaters and realize reduction in weight and low cost. The heat medium heating apparatus includes: the plurality of flat heat exchanger tubes 12; the 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.

Description

technical field [0001] The present invention relates to a heat medium heating device that heats a heat medium using a PTC heater, and a vehicle air conditioner including the same. Background technique [0002] In vehicle air conditioners applicable to electric vehicles, hybrid vehicles, etc., there is known a heat medium heating device for heating a medium to be heated as a heat source for heating, which uses a positive characteristic thermistor element (Positive Temperature Coefficient; Hereinafter, it is referred to as a PTC element.) It is a PTC heater used as a heat dissipation element. The PTC heater has a positive thermistor characteristic, and the resistance value increases as the temperature rises, thereby controlling the current consumption, and the temperature rises slowly. After that, the current consumption and the temperature of the heat dissipation part reach the saturation region and stabilize, and have Self temperature control feature. [0003] Among the ab...

AI Technical Summary

Problems solved by technology

However, it is difficult to arrange PTC heaters in multiple layers, so the plane area becomes larger, and a heat medium circulation box and a dedicated substrate storage box are required, and these are all made of aluminum die-casting for heat resistance and heat transfer. Therefore, there are limitations in small size and light weight, and there are problems such as high cost

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