Bi-directional two stage composite filter structure

Abstract

The present invention relates to a double-direction two-stage composite filter mechanism, belonging to the field of environment-protecting technology. Said invention includes bottom plate, two two-position three-way electromagnetic valves, two groups of two-stage composite filters, pressure difference sensor and control unit. Said invention adopts unique two-stage composite filter integrated optimized design to make filtering accuracy of two filtering elements obtain optimum matching and obvious filtering effect, and can prolong the service life of said filtering element. At the same time, said invention adopts PLC to receive the signal of pressure difference sensor to automatically control two-position three-way electromagnetic valves so as to implement that when one worked one-way two-stage composite filter is blocked, another one-way two-stage composite filter can be used so as to raise the stability of system.

Description

technical field [0001] The invention relates to a filter mechanism, in particular to a two-way two-stage combination filter mechanism used for pre-filtration in a membrane separation device of a ship's oil-water separator. It belongs to the technical field of environmental protection. Background technique [0002] According to the new resolution of MPEC.107(49) passed by the International Maritime Environment Protection Committee of the International Maritime Organization, it is stipulated that the ships under construction must be equipped with a new type of oil-water separator with an oil discharge of no more than 15PPM oily mixture. When we develop oil-water separators that meet the new regulations It was found that when the membrane separation was performed on the emulsion after most of the oil slick was removed through mechanical separation, because the composition of the emulsion entering the membrane was complex and contained more large-diameter particles, such as ferr...

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Problems solved by technology

[0002] According to the new resolution of MPEC.107(49) passed by the International Maritime Environment Protection Committee of the International Maritime Organization, it is stipulated that the ships under construction must be equipped with a new type of oil-water separator with an oil discharge of no more than 15PPM oily mixture. When we develop oil-water separators that meet the new regulations It was found that when the membrane separation was performed on the emulsion after most of the oil slick was removed through mechanical separation, because the composition of the emulsion entering the membrane was complex and contained more large-diameter particles, such as ferroferric oxide and other substances, Such substances directly entering the membrane will seriously affect the performance and life of the membrane, causing the membrane to quickly clog or even fail, and the membrane module has to be replaced frequently, making system maintenance difficult and the maintenance cost greatly increased. In order to solve this problem, a Pre-filter for protection

In the existing technology, the application number is 94238960.3, and the name is the utility model patent of the hydraulic pilot logic switching double filter. This kind of filter controls the oil flow of the left and right filters through the hydraulic system switching valve. The installation and debugging are cumbersome, the system is unstable, the input cost is high, and there is only one level of filtration in each direction, which does not meet the liquid with complex components, and the filter element is easy to block; the application number is 98233324.2, and the utility model patent named duplex lubricating oil filter is used. For locomotive diesel engine supercharger systems, the degree of automation of the duplex oil filter is not enough, and the filtering accuracy of the filter has not been optimized, and the filter element needs to be replaced frequently

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