| 摘要 |
<p>The invention relates to a suction hood for exhausting and cleaning fumes and mist from machining processes, for example welding. It comprises a cover, ducting channel extending at least partly in the cover and having an entrance and an exit. The ducting channel is adapted to communicate with a fan to create a suction flow in the ducting channel from the entrance to the exit. At least a pre-filter is provided within the ducting channel. A connection may connect to a main filter. The pre-filter is arranged behind the entrance, as seen in the direction of flow, and is provided with a labyrinth path to catch sparks and other particles. A pressure drop sensor senses the pressure drop over the pre-filter and a warning signal device is connected to the sensor. A temperature sensor may be used to warn for a fire in the pre-filter in an early stage. The structure of the hood is such that it can be transported in a compact manner and that placing and replacing the pre-filter is easy.</p> |
