Automatic backwash suction filter

Abstract

The invention relates to an automatic back flush and liquid absorption filter, belonging to the field of an automatic back flush filter device for an emulsion in a coal mine. In the filter provided by the invention, a barrel body (5) is divided into two parts; the interior of the barrel body (5) is divided into a liquid absorption chamber (1) and a filtration chamber (6); a liquid outlet (24) is formed on one end surface of the liquid absorption chamber (1); a back flush device is installed in the liquid absorption chamber (1); a filter element (7) is installed in the filtration chamber (6) through a bearing (29) and a shaft (28); a check valve (11) is installed at the other end of the filtration chamber (6) through a limit piece (9); the check valve (11) is connected with a control mechanism (16); a blowoff valve (4) is installed in a drain outlet (3) at one side of the filtration chamber (6); a back flush pipe is installed at one side in the barrel body (5) and between the filter element (7) and the barrel body (5); one end of the back flush pipe is connected with the back flush device, and the other end is installed in the filtration chamber (6); and multiple back flush holes (40) are uniformly distributed on the wall of the pipe. The filter provided by the invention has the advantages of large filter area, strong drain capacity, long service life, can realize timing or automatic online cleaning and the like.

Description

technical field [0001] The utility model relates to an automatic backwash liquid suction 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; the emulsion The relationship between the water quality and oil quality during the proportioning produces roughness, crystallization of the water-oil mixture, sundries brought out when the emulsion passes through the 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 ...

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; the emulsion The relationship between the water quality and oil quality during the proportioning produces roughness, crystallization of the water-oil mixture, sundries brought out when the emulsion passes through the 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 will pollute the emulsion, resulting in out-of-control failures and equipment damage to the hydraulic system. Therefore, the filtration of the emulsion is extremely important; the suction filter is used in front of the emulsion pump station, The first stage of filtration at the outlet of the liquid distribution system, the filtered emulsion is sucked by the emulsion pump to supply all the hydraulic equipment and hydraulic supports on the working face; but the filters currently used have the following shortcomings: 1) most manufacturers produce Due to the small filtration area of ​​the filter, the filtration volume cannot meet the flow requirements of the normal liquid, so the filter is not installed at all, such as 315L, 400L, 500L emulsion tank; 2) the existing suction filter It does not have backwashing and automatic backwashing functions, and is limited to single use and cannot be used in parallel to switch alternately. It cannot realize on-line cleaning and on-line replacement of filter elements and maintenance; 3) There are big problems in the cleaning of filters. There are two methods of analysis: ① During normal use, the medium enters the filter element and filters 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 viscosity from the outside to the inside. Larger floating objects block the mesh of the filter element. Filters with backwashing 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 be used for a large area of ​​the 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 disassembly and assembly. 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 902016482 "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 utilizes 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 be closed and opened when an external power is required; secondly, due to The reason why the direction of water flow has not changed and the pressure in the filter chamber has not been relieved during filtering and flushing is that the cleaning effect has yet to be proven

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