The filter mechanism is composed of a filter plate, a filter box, a filter cloth and a pressing diaphragm. The filter plate is covered with a filter cloth on both sides. When the press diaphragm is to be arranged, a group of filter plates is composed of a diaphragm plate and a side plate. Diaphragm plate on both sides of the substrate covered with rubber diaphragm, the outer membrane covered with filter cloth, the side plate that is the ordinary filter plate. Material from the thrust plate on the material into the filter chamber, the solid particles because of its particle size is larger than the filter medium (filter cloth) aperture was trapped in the filter room, the filtrate from the bottom of the filter plate out of the hole. Filter cake needs to be squeezed, in addition to the use of diaphragm pressure, but also with compressed air or steam, from the washing mouth, air flow to filter the water in the filter cake to reduce the moisture content of the filter cake.
(1) filter mode
The filtrate flows out in a clear flow filter and undercurrent filtration.
A, bright flow filter: the bottom of each filter plate out of the hole with water Tsui, the filtrate intuitively from the water Tsui out.
B, undercurrent filter: the bottom of each filter with a liquid channel hole, a number of filter plate out of the liquid hole into a liquid
Road, by the thrust plate below the outlet hole connected to the pipeline discharge.
(2) washing method
Filter cake need to wash, there are bright flow one-way washing and two-way washing, dark flow one-way washing and two-way washing.
A, bright flow one-way washing is, the lotion from the thrust plate of the lotion into the hole in turn, through the filter cloth and then through the filter cake, from the non-porous filter plate outflow, then the hole out of the water nozzle is closed State, non-perforated out of the water nozzle is open state.
B, bright flow two-way washing is, wash the liquid from the top of the push plate on both sides of the lotion into the hole has two washing, that is, wash the first side of the washing and then from the other side of the washing, Angle direction, so called two-way cross-washing.
C, undercurrent unidirectional flow is, the lotion from the thrust plate of the lotion into the hole into the hole plate, through the filter cloth and then through the filter cake, from the non-porous filter plate out.
D, undercurrent two-way washing is the lotion from the top of the board on both sides of the two wash into the hole has two washing, that is, washing from the side of the first washing, and then from the other side of the washing, the export of diamonds Direction, so called the undercurrent two-way cross-washing.
(3) filter cloth: filter cloth is a major filter media, filter cloth selection and use of the filter effect has a decisive role in the selection of the material according to the PH value of the filter, solid particle size and other factors use the appropriate filter cloth Material and aperture to ensure low filtration costs and high filtration efficiency, use, to ensure that the filter cloth is not discounted, aperture flow.