| 摘要 |
PURPOSE:To prevent cold draft in the start of heating in a heater for introducing warm air pressurized by an air pump to a chamber to be heated like a compartment through an air path by interposing a throttle valve for changing the sectional area of path in the air path. CONSTITUTION:To an intake port 2b of an air pump 2 driven through a belt transmission mechanism 3 by an engine 1 is connected an air cleaner 6 through an intake air path 5, and a main duct duct 8 is connected to a discharge port 2c of the air pump 2 through a discharge air path 7. On the way of the discharge air path 7 is interposed a throttle valve 10 for changing the path area to adjust pressured air temperature. Also, a return path 12 is connectively branched from the discharge air path 7 downstream of the throttle valve 10 and a three- way change-over valve 13 is provided in the branched portion. And a shutter plate 18 for selectively opening and closing the main duct 5 and the discharge air path 7 is provided at the downstream side of a warm water heater of the main duct 8. |
