A gradient filtration structure and pre-filter

Abstract

The utility model discloses a gradient filtration structure and prefilter relates to prefilter technical field, and gradient filtration structure includes: a plurality of stacked together laminated sheet, and laminated sheet includes: inner ring part and outer ring part, first rib muscle, two first rib muscles of adjacent combination form first through slot, second rib muscle, two second rib muscles of adjacent combination form second through slot, when two laminated sheets are stacked together, first through slot and second through slot combination form first flow channel, third rib muscle, two third rib muscles of adjacent combination form third through slot, fourth rib muscle, two fourth rib muscles of adjacent combination form fourth through slot, when two laminated sheets are stacked together, third through slot and fourth through slot combination form second flow channel. The above -mentioned gradient filtration structure has solved laminated sheet filtering effect in prefilter of existing prefilter and is single, and the technical problem that filtering precision is small and influences flow, and is easy to jam, and filtering precision is big, and the interception effect of granular impurity is not good.

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