| 摘要 |
<p>PURPOSE:To make it possible to decide the restoration time of an exhaled fine particles gathering trap appropriately, with an inexpensive device, by detecting the pressure at a way-in and the pressure at a way-out of the trap, with one selectively connected pressure sensor, and deciding whether the trap should be restored or not, on the ratio of the said two pressures. CONSTITUTION:Pressure taking-out-ports C, D are formed respectively in an exhaust route on a way-in-side and that on a way-out-side of an exhaled fine particles gathering trap A, which is set in an exhaust route. Either one of these pressure taking-out-ports C, D is connected to a pressure sensor E selectively, by an electro-magnetic valve F. The electro-magnetic valve F is switched periodically by an electro-magnetic valve control means G. Pressure P1 at the way-in of the trap and pressure P2 at the way-out of the trap, which are detected by the pressure sensor E, are temporarily stored in memory means H, J, respectively. Then, it is decided whether the trap A should be stored or not by a storation time deciding means K, on the ratio of the said two pressures P1, P2 stored in memory means H, J. After that, the trap A is stored by the operation of a burner B.</p> |
