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The vacuum filter VLO is suited for cleaning cooling lubricants (CL) for grinding processes. A typical application is profile and gear grinding with processing oil. Due to its easy scalability the filtration unit can be used locally for individual machines or centrally for machine groups. In any case the result is clean oil as well as pure, dry concentrate. And all this without using filter aids.
A lifting pump conveys the contaminated liquid into the inlet box. After having been cleaned, it flows from there through the endless belt into the filter chamber and afterwards into the clean tank. The filter pump creates a vacuum inside the filter chamber. Due to the high pressure difference on the surface of the filter, a thick filter cake (concentrate) forms on the endless belt. This filter cake acts as a filter medium and separates smallest dirt particles.
The growing filter cake increases the flow resistance through the filter surface, causing the vacuum inside the filter chamber to rise. When the level reaches a selected threshold value, the belt drive switches on and conveys the endless belt a little further. Thereby, permeable endless belt reaches the filter surface and the volumetric flow increases again.
The endless filter belt passes through the following stations: