Back washing filter

Abstract

The invention discloses a back washing filter which comprises a valve body, wherein the valve body is provided with a liquid inlet, a liquid outlet and a drain outlet; a plurality of valve core components and a plurality of filter core components are arranged in the valve body; communicating channels are arranged between the valve core components and the filter core components; each valve core component comprises a liquid valve core and a drain valve core which are arranged back to back; small springs are arranged between liquid valve cores and drain valve cores; the rear ends of the drain valve cores are provided with push rods. The back washing filter also comprises a filter guide core, a non return valve and a pilot valve; the liquid outlet is communicated with liquid cavities at the rear ends of the pushing rods sequentially though the filter guide core, the non return valve and the pilot valve and is used for controlling conversion between a normal operating position and a back washing position. The invention has the advantages of convenient use and effect prolonging of the service life of the filter core.

Description

technical field [0001] The invention relates to a filter, in particular to a backwash filter. Background technique [0002] With the continuous promotion of the bracket electro-hydraulic control system, the filter element is required to have an online cleaning function. [0003] The backwash filter in the prior art adopts a manual backwash filter or a backwash filter with a two-position two-way reversing mechanism. [0004] Above-mentioned prior art comprises following shortcoming at least: [0005] The manual backwashing filter needs to manually pull the backwashing handle for backwashing, which greatly increases the labor intensity of the laborers; due to system pressure fluctuations, when the pressure at the liquid inlet decreases, the liquid pressure at the liquid outlet is higher than that at the liquid inlet , The high-pressure fluid flows out from the inside of the filter element, which will cause the filter element to bulge, which greatly reduces the service life o...

AI Technical Summary

Problems solved by technology

[0005] The manual backwashing filter needs to manually pull the backwashing handle for backwashing, which greatly increases the labor intensity of the laborers; due to system pressure fluctuations, when the pressure at the liquid inlet decreases, the liquid pressure at the liquid outlet is higher than that at the liquid inlet , the high-pressure fluid flows out from the inside of the filter element, which will cause the filter element to bulge, which greatly reduces the service life of the filter element

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