Working principle of vacuum oil filter:
The vacuum oil filter forms a negative pressure at the outlet of the filtrate as the driving force for filtration. The absolute pressure of the operating vacuum of the industrial vacuum filter is (2.5 ~ 8.0) 105 Pa. The temperature of the suspension during filtration should be lower than the vaporization temperature of the filtrate under the operating vacuum. This filter is divided into batch operation and continuous operation.
The intermittently operated vacuum filter can filter suspensions of various concentrations. The vacuum leaf filter is filled with suspension in the container shell. The filter leaf wrapped with filter cloth on both sides is immersed in the suspension, and the inner cavity of the filter leaf is connected with the vacuum system. After the filtrate is sucked out, it is led out by the pipe, and the filter residue accumulated on the surface of the filter leaf is removed after the shutdown.
The continuously operated vacuum filter is suitable for filtering thick suspensions containing more solid particles. The working principles of the rotary drum vacuum filter, the inner filter surface rotary drum vacuum filter, the disc vacuum filter and the tipping bucket vacuum filter are similar.
The entire filter surface is divided into a plurality of separated filter chambers, and each rotating filter chamber is sequentially connected to each fixed pipe through a distribution valve to suck out the filtrate and lotion in the filter chamber, or send compressed air. Each filter chamber rotates one circle to complete the whole process of filtration operation, and the operations of multiple filter chambers are connected to form continuous filtration. The structure of the belt vacuum filter is similar to that of the belt conveyor, with a continuous filter belt suitable for easy-to-filter suspensions. The belt vacuum filter, the inner filter surface drum vacuum filter and the tipping bucket vacuum filter are all fed on the top of the filter medium (filter cloth), which is especially suitable for the suspension of solid particles with high density and fast sedimentation.