Third, the classification of pre-filter
Pre-filters can be divided into four categories according to their working principle: laminated filter, parallel filter, siphon filter, backwash filter
1, laminated filter
A specific plastic lamination is engraved with a large number of micron-sized grooves on both sides, and a series of identical laminations are pressed against a specially designed inner support to form a series of filter units of about 100 microns. When filtering, water passes through the lamination from the outside. The foreign particles are trapped at the intersection of the laminations, and the filtered water flows out of the filter.
2, the pass filter
The 50-100μm stainless steel strainer is used to penetrate the outer wall of the pipe through the pressure of the tap water. The impurities such as sediment and rust are trapped by the pores of the membrane. The impurities trapped by the stainless steel membrane of the flushing valve are washed away by the water, and the filter element is realized. rinse.
3, siphon filter
The pressure of the tap water penetrates from the outer wall of the pipe to the inside, the sediment and rust are left on the surface of the membrane, and the water of the flushing switch is opened to form a negative pressure around the filter. The built-in water distributor can effectively remove the impurities on the filter and is trapped in the membrane. The impurities on the surface are washed away by the water through the wiper. If the water quality is poor, it may be blocked. Once it is blocked, it is troublesome to maintain.
4, backwash type filter
The pressure of the tap water penetrates from the inner wall of the filter screen to the outer wall, and the particulate impurities such as sediment and rust are trapped in the tube, and the impurities trapped by the filter screen are washed away by the water, and if the water quality is poor, the filter hole is blocked. It can pass the backwashing function. At this time, the impurities embedded in the mesh will be washed away by the cup of water to prevent secondary pollution caused by impurities.