| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioning device capable of feeding cooling water which is sufficiently heated to a heater even when an engine speed is low.SOLUTION: An air conditioning device includes: a cooling pipeline 41 for circulating cooling water by connecting between a water jacket in an engine 5 and a radiator 37; a water temperature sensor 36 for detecting temperature of the cooling water; a room temperature sensor 43 for detecting temperature in a cabin 8; a water pump 31 provided in the middle of the cooling pipeline 41 and feeding the cooling water; a heater unit 34 for sending warm air to the cabin 8; a heating pipeline 35 for feeding the cooling water to the heater unit 34; a switching valve 42 for switching water feeding from the water jacket to the radiator 37 and the heater unit 34; and an electric motor 32 for driving the water pump 31. During heating, the switching valve 42 is switched according to the temperature of the cooling water and the room temperature, and the rotational frequency of the electric motor 32 is changed. |
