KNOLL Maschinenbau GmbH Schwarzachstraße 20
D-88348 Bad Saulgau
The turbo filter serves to clean the cooling lubricants of machining processes (e.g. milling, turning, drilling). The modular system allows the filter to be used both decentrally in standalone machines as well as be installed in central plants. The filter works in accordance with the reverse flow principle and does not require any filter media. The sludge conveyor with integrated scraper conveyor, which serves as a sediment reservoir, discharge conveyor and fluid buffer, is especially suited for handling the concentrated reverse flow liquid. If required, a bath purification in the bypass flow expands (e.g. belt filter or centrifuge) the plant, in order to prevent a concentration of unsedimented fine particles.
Contaminated fluid flows in tangentially through the inlet into the outer part of the filter body. Centrifugal force separates a part of the solid particles, which are retained at the outer housing wall. After flowing through the filter element, which retains additional particles, the liquid reaches the clean area and then the outlet. A filter cake forms on the filter element, which also separates very small particles. The pressurised liquid compresses the air into the reverse flow buffer which fills with clean liquid.
The increasingly thick filter cake causes the volume flow through the filter element to decrease. The regeneration phase begins when a set differential pressure between the contaminated and clean liquid is reached: the de-sludging valve opens while at the same time the clean liquid outlet closes. The air in the reverse flow buffer releases and presses the liquid internally through a rotating reverse flow nozzle through the filter element. The filter cake is thereby released and arrives into the processing plant (e.g. sedimentation reservoir or belt filter) through the de-sludging valve.