VACUUM FILTER

The vacuum filter is a negative-pressured, gravity-assisted, filter media-based filtration system. It is an evolved form of the basic paper band filtration system with the advantage of occupying lesser floor space.

For processes removing finer materials such as grinding, rolling mills etc, a finer filtration level is required. If the fluid is not filtered to the desired filtration level, the particles may leave a mark on the surface. Normal gravity filters do not give the desired filtration level and the media consumption can be very high. In such cases, a vacuum filter is an ideal solution. With the help of a vacuum producer, finer filter media can also be used for very fine operations.

TYPES

Vacuum filters work on the pressure differential created due to the suction of a pump. It is this pressure difference that enables better filtration. 

The filtration system consists of a conveyorized dirty tank with an inlet chute. The bottom of the tank forms the vacuum chamber created by a pump suction. The filter media (depending on the clarity requirement) is laid between the conveyor and the vacuum chamber. The fluid is sucked through the media to the chamber where the clean liquid collects, while the dirt particles remain on the media. The pump suction connected to the vacuum chamber sucks the clean fluid. When the media chokes, the vacuum increases and is sensed by a switch. A common drive placed at the exit end activates the conveyor and pushes out the dirty media. A clean filter media of fixed length takes its place and the normal cycle resumes.

The filtration capacity ranges from 100 to 5,000 LPM (26 to 1,320 GPM).

Pneumatic vacuum filters follow the same operating principle as hydraulic vacuum filters. The difference is that the vacuum is achieved by a vacuum pump inside a contained chamber.

In pneumatic vacuum filters, the vacuum is achieved by a blower placed on top of the filter. The feeder pump supplies the vacuum filter with contaminated fluid from the dirty tank. This fluid is pumped into a distributor, where it is evenly distributed across the pool on the filter bed. The bed consists of a flat wire belt that supports the filter media. An exhauster produces a vacuum in the chamber beneath the filter bed, drawing fluid through the media and the built-up deposit of filter cake/media. When the accumulation of the cake reaches a set limit, an electrical switch activates a motor that indexes the media and transfers the dried filter cake into a disposal container. At the same time, fresh filter media is drawn onto the filter bed.

The filtration capacity ranges from 100 to 10,000 LPM (26 to 2641 GPM).

ADVANTAGES

  • Suitable for finer filtration. Paper consumption drops by 80%.
  • Can be used with disposable and back-washable media.
  • Fully automatic operation.
  • Compact design.
  • Can be customized to suit customer requirements.

APPLICATIONS

  • Internal & centerless grinding
  • Honing
  • Lapping
  • Gear cutting
  • Gear hobbing
  • Milling
  • Machining centers