Method and device for filtration of fluids from manufacturing machines

摘要

In a fluid filtration process, the fluid passes through the filter membrane (28) from bottom to top, depositing particles on the bottom, The membrane is back-flushed using from top to bottom using fluid which has been filtered in the membrane. During the back-flushing process the membrane is exposed to ultrasound. ??During the back-flush process additional pressure is exerted on the membrane via the permeate column. The excess pressure is in the range 0.3 to 3 bar. The fluid back-flushed with particles is discharged via a filter outlet (39) to a filter bag, filter chamber press or centrifugal separator. Also claimed is a commensurate filter that cleans rinsing fluid used in metalworking processes esp. spark erosion or grinding machinery. The filter assembly (20) has a filtrate container (1) with a base (2) outlet (16) passing particle-laden fluid upwards (30) to the membrane, and which also returns a portion of the filtrate back to the membrane. The assembly has an ultrasonic emitter (5) located above the filter. The membrane is woven plastics, natural thread, metal filament or fiber.