Automatic backwashing liquid-returning filter

Abstract

The invention relates to an automatic backwashing liquid-returning filter, belonging to the field of automatic backwashing filtering devices of emulsion in a coal mine. A cylinder (10) is divided into an upper part and a lower part, the inside of the cylinder (10) is divided into a liquid inlet and outlet chamber (1) and a filter chamber (2), a liquid inlet (14) and a liquid outlet (22) are bisymmetrically arranged at the upper part of the liquid inlet and outlet chamber (1), two groups of backwashing devices are correspondingly installed inside the liquid inlet and outlet chamber (1), a filter element (9) is installed in the filter chamber (2) through a shaft (42) and a bearing (43), a big nut (6) and a stop member (5) are connected to the lower end of the filter chamber (2) in threads, the stop member (5) is connected with a drainage valve (4), a backwashing pipe (27) is arranged at one side inside the filter chamber (2), the backwashing devices are connected to the upper part of the backwashing pipe (27), and a plurality of backwashing holes (38) are uniformly distributed on pipe walls. The automatic backwashing liquid-returning filter has the advantages of long service life, large filter area, strong drainage capacity, timed or automatic online backwashing and the like.

Description

technical field [0001] The utility model relates to an automatic backwash liquid return filter, which is the pre-filter of an emulsion pump and belongs to the field of automatic backwash filter devices for emulsion in coal mines. Background technique [0002] Mine hydraulic supports and other hydraulic equipment, including emulsion pumps, the working medium is emulsion, and the cleanliness of the emulsion is directly related to the working performance and service life of the hydraulic cylinders, all valve groups and all hydraulic systems of the hydraulic equipment; emulsification The relationship between water quality and oil quality during the liquid ratio produces roughness, crystallization of water-oil mixture, sundries brought out when the emulsion passes through hydraulic equipment after recycling, and particles that fall off the inner wall of the hose after friction and coal mine underground The coal dust produced by factors such as the working environment and other fa...

AI Technical Summary

Problems solved by technology

[0002] Mine hydraulic supports and other hydraulic equipment, including emulsion pumps, the working medium is emulsion, and the cleanliness of the emulsion is directly related to the working performance and service life of the hydraulic cylinders, all valve groups and all hydraulic systems of the hydraulic equipment; emulsification The relationship between water quality and oil quality during the liquid ratio produces roughness, crystallization of water-oil mixture, sundries brought out when the emulsion passes through hydraulic equipment after recycling, and particles that fall off the inner wall of the hose after friction and coal mine underground The coal dust produced by factors such as the working environment and other factors will pollute the emulsion, causing the hydraulic system to cause out-of-control failures and equipment damage, so the filtration of the emulsion is extremely important; the return filter is used in front of the emulsion pump station , The first-stage filtration at the outlet of the liquid distribution system, the filtered emulsion is sucked by the emulsion pump to supply the liquid for all hydraulic equipment and hydraulic supports on the working face; but the filters currently used have the following deficiencies: 1) Most manufacturers Due to the small filter area of ​​the produced emulsion distribution tank, the filtration volume cannot meet the flow requirements of normal liquid, so the filter is not installed at all, such as 315L, 400L, 500L emulsion tank; 2) Existing liquid return filtration The filter does not have backwashing and automatic backwashing functions, which are limited to single use and cannot be used in parallel to switch alternately, and cannot realize online cleaning and online replacement of filter elements and maintenance; 3) There are big problems in filter cleaning. There are two methods of use analysis: ① During normal use, the medium enters the inside of the filter element to filter outward, and the sediment is filtered in the inner cavity of the filter element, so that the above-mentioned debris cannot be discharged, causing the filter element to be blocked; ②Some media filter debris and debris from the outside to the inside Viscous floating objects block the mesh of the filter element. Filters with backwash function are all backwashed from the inside to the outside, only a small part of the upper part is washed away, and the cleaning area is less than 20%, which cannot achieve a large filter element. Due to the untimely cleaning of the filter and the structure of the filter element, the service life of the filter element is low and the hydraulic system is damaged. Usually, a filter element only takes 2 to 3 months, and each manual cleaning and replacement of the filter element is due to dismantling. Installation is inconvenient, extremely labor-intensive and time-consuming, and cannot meet the requirements of fully mechanized mining automation in large coal mines

[0003] For example, the Chinese patent application number 90201648.2 "a filter using a self-cleaning filter element", they realized the backwashing of the medium by adding a backwash pump. This solution needs to add equipment to solve the power source, but the cleaning effect is still not ideal; application number The Chinese patent "automatic backwash filter" of 02149389.8 uses the filter valve plate and the backwash valve plate to realize the filtering and backwash functions, and the filter valve plate and the backwash valve plate need to prepare external power when closing and opening; secondly, due to The reason why the direction of water flow has not changed during filtering and flushing and the pressure in the filter chamber has not been relieved is that the cleaning effect has yet to be proved by practice

Images