The utility model discloses a semi-automatic
backwashing laminated filter. The external structure of the semi-automatic
backwashing laminated filter comprises a
handle, a filter base body, a water inlet, a water outlet, a laminated shell, a blow-down valve, a blockage indicator, a filter screen flushing valve and the like, the internal structure comprises a flow direction selector, a butterfly
check valve, a laminated
filter element, a
rotational flow centrifugal disc, a laminated compression inner cover, a laminated compression outer cover, a spring between the laminated compression inner cover and the laminated compression outer cover and the like. The channel position of the flow direction selector is switched by rotating the
handle, so that the switching between the filtering mode and the
backwashing mode is realized. In a filtering mode, muddy water flows into a
raw water cavity outside the lamination after being accelerated by the
rotational flow centrifugal disc, impurities are intercepted, and clear water flows into a downstream pipeline; and in a backwashing mode, the
water flow is sprayed out from the spraying holes in the
filter element frame by pressing the position of the lamination for compressing the inner cover and loosening the lamination, so that impurities are eluted from the lamination and discharged through the blow-down valve. In addition, a filter screen is arranged on the flow direction selector to intercept impurities of flushing water, and the filter screen can be flushed in a filtering mode. The utility model has the advantages of convenient use and simple structure.