| 摘要 |
PURPOSE:To apply blowers of small size to a room cooler and reduce its mounting space, by using the four blowers, connecting motor circuits of these blowers parallelly two by two and selectively performing switching of a blower speed through series-parallel circuit switching and the like of said two parallel circuits. CONSTITUTION:In case of application to a bus vehicle, a cooling unit 2 is set to a rear part ceiling of a car room 1a in a vehicle main unit 1, and an evaporator 3, cooling peripheral air by evaporation of a coolant, is built in the cooling unit 2, then four blowers 4a-4c, blowing air cooled in the evaporator 3 to ceiling blow-off ducts 7, 8 in both sides of the vehicle, are equipped. Here a motor circuit of the blowers 4a, 4b and motor circuit of the blowers 4c, 4d of the four blowers 4a-4d are parallelly connected respectively, while fixed resistors 13, 14 are connected respectively to each parallel circuit. Then a blower speed can be selectively changed by series-parallel circuit switching of said two parallel circuits and combination of the fixed resistors 13, 14. |
