Screen filter

Abstract

The invention relates to a screen filter, which belongs to the water-saving irrigation technology field. The invention has the technical proposal that the screen filter comprises a shell, a water inlet, a water outlet and a drain valve. The invention is characterized in that multi-stage cylindrical wall surface type filter screens are coaxially arranged in the shell, the meshes of the filter screen at the surface close to the water inlet are large, and the meshes of the filter screen at the surface close to the water outlet are small. The filter screens of the filter provided by the invention adopt the multi-stage cylindrical wall surface type, and the filter is structurally divided into multiple layers of filter screens from coarseness to fine, for example, three layers of filter screens are adopted. A coarse filter screen is adopted at the position close to the water inlet, a fine filter screen is adopted at the position close to the water outlet, and a middle filter screen is adopted between the coarse filter screen and the fine filter screen. The structure can enable impurities with different particle diameters to be intercepted by different filter screens, thereby reducing the load of each filter screen and prolonging the working time of filtering.

Description

technical field [0001] The invention relates to a net filter and belongs to the technical field of water-saving irrigation. It consists of a shell, an upper cover, an inlet, an outlet, and a sewage valve. It is characterized in that a multi-stage cylindrical wall filter is coaxially installed in the shell, and the filter on the side close to the water inlet has a large mesh. The sieve hole of the filter screen near the water outlet side is small. technical background [0002] The filter is an important key component in the micro-irrigation system. It filters the impurities and dirt in the irrigation water to make the water quality meet the requirements of the micro-irrigation system. It is required to have a simple structure and low price, so the commonly used filters mainly include mesh filters, laminated filters, sand filters and water-sand separators. Among them, the mesh filter is the most commonly used one. [0003] Mesh filter Filtration principle: There is a sieve-...

AI Technical Summary

Problems solved by technology

[0004] Generally, the filter surface of the screen filter is a single cylindrical wall surface. When the water quality is not good, especially when the sediment content is high, the filter is particularly easy to filter because the sediment of different sizes is blocked on the same layer of filter screen. Blockage requires frequent and repeated flushing, which affects the operating efficiency and function of the irrigation system, and also reduces the service life of the filter

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