| 摘要 |
A device for controlling the air pressure within a low pressure environmental testing chamber for a self-propelled vehicle is disclosed. According to the invention, the device includes a system for introducing the outside air into the testing chamber, a first air pipe having an air suction port at its one end positioned in the vicinity of a discharge opening of a discharge duct of the vehicle disposed in the testing chamber and having its other end connected to a main air pipe, a second air pipe having an air inlet at its one end opened into the testing chamber and having its other end connected to the main air valve, an air blower adapted for reducing the air pressure, the air blower having a variable r.p.m. and mounted halfway in the main air pipe, a first silencer provided in the main air pipe at the air discharge side of the air blower and opened into atmosphere, and a branched pipe having a second silencer at an outside air intake side. The branched pipe has the end opposite to the second silencer connected to the main pipe at the suction side of the air blower. The branched pipe also has a second pressure regulating valve halfway between the second silencer and the end connected to the main air pipe.
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