Heat medium-heating device and vehicle air-conditioning device with same

Abstract

Provided are a heat medium-heating device and a vehicle air-conditioning device which is provided with the heat medium-heating device, the heat medium-heating device being configured so that the heat medium-heating device can be mounted within a casing in such a manner that flat heat exchange tubes and PTC heaters are in sufficiently close contact with each other and also in such a manner that the outlet and inlet header sections of the flat heat exchange tubes are in sufficiently close contact with each other; and . A heat medium-heating device is mounted to the inner bottom surface of a casing while PTC heaters (18) and flat heat exchange tubes (17), which have flat tube sections (20) and outlet and inlet header sections (21, 22), are stacked in layers and while one face side of the flat heat exchange tubes (17) is pressed by a heat exchange pressing member (16). One face of at least the uppermost flat heat exchange tube (17a) among the stacked flat heat exchange tubes (17), the one face being pressed by the heat exchange pressing member (16), has a flat-surface shape formed by flattening the flat tube section (20) and the outlet and inlet header sections (21, 22).

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 suitable for electric vehicles, hybrid vehicles, etc., one of the heat medium heating devices that heats the medium to be heated as a heat source for heating is known to use a positive characteristic thermistor element ( Positive Temperature Coefficient; hereinafter referred to as PTC element) is a PTC heater that acts as a heat generating element. In such a heating medium heating device, Patent Document 1 proposes that a plurality of partition walls are provided to divide a housing having a heat medium inlet and an outlet into a heating chamber and a heat medium circulation chamber. A PTC heating element is inserted into the divided heating chamber side so as to be in contact with the partition wall, and heats the heat medium flowing throu...

AI Technical Summary

Problems solved by technology

[0004] However, in the heat medium heating device proposed in Patent Document 1, there is the following problem: it is difficult to insert the PTC heating element closely between the partition walls as the heat transfer surface, and the contact thermal resistance between the partition wall and the PTC heating element becomes large. , the heat conduction efficiency decreases

In addition, in the heat medium heating device proposed in Patent Document 2, although the adhesion between the PTC heater and the heat medium circulation box can be improved and the contact thermal resistance can be reduced, it is difficult to arrange the PTC heater in multiple layers, so the planar The area becomes larger, and a heat medium circulation box and a dedicated substrate storage box are required, so there are limitations in terms of size, weight, and cost reduction

Images