SU1595549A1 - Self-cleaning filter - Google Patents

Abstract

The invention relates to filtration and can be used to clean liquids from mechanical impurities in the chemical industry. The purpose of the invention is to increase the cleaning efficiency of the filter element, reducing the pressure period and maintenance costs. The filter includes a housing with nozzles, a filter element in the form of a perforated cylinder, a soil removal unit and a cleaning mechanism, including a piston with an annular scraper, installed with the possibility of reciprocating movement. A distinctive feature of the proposed design is that the cleaning mechanism is equipped with a brush and is made in the form of a tube with an external tape thread installed along the axis of the filter element, springs and nuts mounted on the tube and interacting with each other, while the piston and brush are mounted on the nut. 1 il.

Description

The invention relates to filtration media and can be used in heat and power engineering and the chemical industry for the separation of mechanical impurities from liquids.

The purpose of the invention is to increase the cleaning efficiency of the filter element from contamination, reduce the pressure drop and reduce the labor costs of servicing the filter.

The drawing shows the filter, the total

The filter consists of a housing 1 with caps 2 and 3, a liquid inlet pipe 4 and a drainage of filtrate 5, a filter element b, made in the form of a perforated cylinder, installed along the axis of the housing 1 of the soil drainage unit, containing

valves 7 and 8 mounted on the cover 3 and the cleaning mechanism of the filter element including the piston 9 installed inside the filter element with an annular scraper 10 and brush 11 mounted on the nut 12. The nut 12 is mounted for rotation and reciprocating movement on the tube 13 on the outer surface of which there is a multi-threaded ribbon thread 14. On the tube 13 a compression spring 15 is installed supporting one end on the cover 3 and the second on the bearing 16 mounted on the nut 12. The tube 13 is rigidly fixed in the cover e 3, and at its free upper end there are holes 17 for removal of contamination, covered by a valve 18 on the cylindrical part of which

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mating holes 19. RopujeHb 9 is mounted on the bearing 20.

The filter works as follows.

In the complete position, the valve 18 closes the nozzle 4. When the fluid is supplied to the inside of the cavity of the filter element 6, the valve 18 opens and the fluid acts

on the piston 9, moves it down., opening part of the working surface of the filter element 6 until the fluid pressure is balanced by the pressure of the spring 15. As the filter element clogs, the pressure drop across the filter increases and, under its influence, the piston 9 moves with the brush 11 downwards, overcoming the back pressure the springs 15, in which case the pressure drop is again taken down to the initial value, i.e. practically remains constant throughout the entire cycle of the filter. In the process of moving the piston 9, the brush 11 and the scraper 10 clean the inner surface of the filter element.

The process of moving the piston 9 continues until it reaches the bottom non-perforated part 21 of the filter element 6, after which the pressure inside the cover 3 rises, the 7 m 8 valves open and the collected contaminants

tapping ts.

After driving the working surface of the filter element 6 to the permissible value of the pressure drop, the flow of fluid into the filter is stopped by shutting off the nozzle 4 using a locking device (not shown). The fluid pressure above the piston 9 drops and under the influence of the spring 15 the piston with the rotating brush 11 rises to the upper position. At the same time, the brush 12 cleans the inner surface of the filter element b, and the contaminants under the action of gravity settle into the cover 3. The contaminants above the piston 9, after the valve 18 is blocked by the nozzle 4 under the influence of the pressure created by the piston, are discharged through the opening 19 valve 18 and hole 17 and tube 13 into its internal cavity, from where they are taken out. After that, the locking device on the nozzle 4 is opened and the filter operation cycle is repeated.

The filter design allows the cleaning of the working surface of the filter element b twice in one 5 filter operation cycle (with the rotating brush and scraper running up and down), which ensures the restoration of the filtering ability of the filter element 6 without replacing it.

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Claims (1)

The claims self-cleaning filter comprising a housing with inlet and outlet nozzles, a filter element made in 25 perforated cylinder located on the axis of the body, a soil removal unit and a filter element cleaning mechanism including a piston with an annular scraper mounted with 30 possibility to return -accessible movement, characterized in that, in order to increase the cleaning efficiency of the filter element, reduce the pressure drop and labor costs for maintenance, 35 cleansing mechanism Weeks are equipped with a brush, installed along the axis of the filter element with a tube with an external tape thread, a spring and a nut mounted on the tube and interacting with each other, with 40 piston and brush mounted on the nut. // to:.