| 摘要 |
The invention concerns an exhaust hood acting as a barrier against parasite insects which proliferate in suction pipes; it also prevents dust and various impurities from being deposited on the suction pipe walls. Said device comprises four elements: the support (1); the squeezing ring (2); the filter (3); the clamping ring (4). The support (1) has on its rear face a sleeve (7) enabling to fix and adjust the device on the suction pipe. The groove (6) provided on the support (1) rear face receives a joint which seals it. The device is assembled by screwing, but there may be other ways. In the clamping ring (4) is housed a filter (3), stabilised by the squeezing ring (2). The clamping ring (4) needs simply to be screwed on the support (1) to make the device functional. The filter (3) may be changed as often as required.
|
