To suppress increase of cost by suppressing an inrush current value to a drive circuit of a PTC heater while improving a heating performance under low temperature.SOLUTION: A heat medium heating device 25 comprises: a casing 31 in which a first heat medium passage 48 and a second heat medium passage 56 in which a heat medium flows are formed; and a PTC heater 33 which includes multiple PTC elements 61 that are arrayed in a flow direction F of the heat medium in the first heat medium passage 48 and the second heat medium passage 56, and electrodes 62A-62C for applying voltages to the PTC elements 61, and which heats the heat medium inside of the first heat medium passage 48 and the second heat medium passage 56. With regard to the multiple PTC elements 61, an average electric resistance value of the PTC elements 61 disposed in the lowermost downstream end in the flow direction F is greater than an average electric resistance value of the PTC elements 61 disposed in the uppermost upstream end in the flow direction F.SELECTED DRAWING: Figure 3
【課題】低温時における暖房性能を向上させつつ、PTCヒータの駆動回路への突入電流値を抑えてコスト上昇を抑える。【解決手段】熱媒体加熱装置25は、熱媒体が流れる第一熱媒体流路48及び第二熱媒体流路56が内部に形成されたケーシング31と、第一熱媒体流路48及び第二熱媒体流路56における前記熱媒体の流れ方向Fに沿って配列された複数のPTC素子61、及びPTC素子61に電圧を印加する電極62A〜62Cを含み、第一熱媒体流路48及び第二熱媒体流路56内の前記熱媒体を加熱するPTCヒータ33と、を備える。複数のPTC素子61は、流れ方向Fの最下流端に配置されたPTC素子61の平均電気抵抗値は、流れ方向Fの最上流端に配置されたPTC素子61の平均電気抵抗値よりも大きい。【選択図】図3
HEAT MEDIUM HEATING DEVICE AND AIR CONDITIONING DEVICE FOR VEHICLE
熱媒体加熱装置及び車両用空調装置
2020-02-20
Patent
Electronic Resource
Japanese
IPC: | H05B ELECTRIC HEATING , Elektrische Heizung / B60H ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES , Anordnung oder Einbau der Heizung, Kühlung, Lüftung oder anderer Luftbehandlungsvorrichtungen für die Fahrzeugräume für Reisende oder Fracht |
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