| 摘要 |
PURPOSE:To improve reliability of the titled device, by providing a filter for high pressure exclusively and a filter for low pressure exclusively at high pressure and low pressure mouthpieces in a pressure switch, which is operated based on the pressure difference between high pressure air and low pressure air. CONSTITUTION:An air feeding mouthpiece 6 on the high pressure side directly introduces the air of a blower. Therefore the air has a large amount of dust, and the deposition of a small amount of dust on the bottom of chamber 4b can not be avoided. Therefore, a mouthpiece 4a of a pipe 2 to a pressure switch 1 is provided at the position, which is separated from said position. In this way, intrusion and attachment of the dust to the electric contacts in a diaphragm chamber of the pressure switch 1 can be prevented. Furthermore, filters 5 and 7 are vertically arranged. The upper sides of the filters 5 and 7 are always kept clean so that the surfaces thereof are not clogged with the dust. |
