SU1397063A1 - Self-cleaning filter for liquid - Google Patents

Abstract

The invention relates to a technique for cleaning liquids and suspensions, m. used in industrial and agricultural water supply systems and allows to simplify the design, increase operational reliability and reduce fluid loss per filter filter. -The filter includes a housing 1 with 2 inlet pipes and 3 inlets, 4 outlet pipes and a discharge pipe 5 of cylindrical shape placed inside the suction chamber 7, having the form of a hollow piston with an annular notch 8 on the side surface and connected to the outlet 5 by a hollow rod 9. Moving the suction 7 amers limited limiting stops 12 and 13. Nozzles 2 and 3, the input manifold 16 communicated with the source liquid feed through a tee 17 with a rotary valve 18 associated with the control unit 19. As a result of the alternate supply of fluid to the nozzles 2 or 3 of the inlet, the extraction chamber 7 is moved between the restriction stops 12 and 13 and cleans the filter septum 6. 1 sludge. and s

Description

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The invention relates to a technique for suspending a liquid from a slurry and can be used in industrial and agricultural water supply systems.

The purpose of the invention is to simplify the design, reduce the loss of fluid for flushing, increase operational reliability. TO

The drawing shows a self-cleaning filter, slit.

The housing 1 of the filter is equipped with two nozzles 2 and 3 of the input, the nozzle 4 of the output and the nozzle 5 of the reset. In the housing 15, a filtering partition 6 of cylindrical shape is installed, inside which a movable suction chamber 7 is placed. The extraction chamber 7 divides the cavity inside the filter septum 6 into cavities 25 10 and 11. The filter septum 6 is provided with restrictive stops 12 and 13, limiting the movements of the suction chamber 7 on both sides, with a locking member made in the form of 30 covers. 14 and 15, blocking the flow of fluid in the suction chamber 7 in its extreme positions. The inlets 2 and 3 of the inlet are in communication with the main supply line 16, 5 through the tee 17c with a rotary valve 18 connected to the automatic control unit 19. I ..

The filter works as follows. 40 Source fluid from line 16 through tee 17 with valve 18 enters the inlet 2 of the inlet, then into the cavity 10, then through the filter septum 6 into the outlet nozzle 4. Suspensions contained in the liquid remain on the inner surface of the filter septum 6 contaminated her.

Part of the purified liquid under the action of the pressure difference in the outlet nozzle 4 and in the discharge nozzle 5 rushes through the filter septum 6 in the opposite direction into the internal cavity of the suction chamber 7, then along the hollow rod 9 - into the nozzle 5 nozzle. In this case, a part of the filter septum 6, adjacent to the annular rim, is cleaned.

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for 8 on the side surface of the suction chamber 7, from the stuck suspension.

During the operation of the filter, the pressure in the outlet nozzle 4 and in the cavity 11 is lower than the pressure in the cavity 10 by the value of the pressure differential across the filter septum 6. Under the action of the pressure difference in the cavities 10 and 11, the extraction chamber 7 moves to the right ( ) before touching the restrictive stop 13, while cleaning the entire surface of the filter septum 6. At this moment the flow of liquid through the suction chamber is blocked by a cover 15,

In this position, the filter works for some time. At the moment when, due to contamination of the filter septum 6, the differential pressure on the latter reaches a predetermined limit value, the automatic control unit 19 smoothly switches the rotary valve 18 to the closed position of the nozzle 2 and opens the nozzle 3 (shown by dotted lines).

During switching, there is a gradual decrease in the fluid flow in the nozzle 2 and its increase in the nozzle 3. When the valve 18 passes through the middle position of the beginning. Then, the movement of the extraction chamber 7 to the left (according to the drawing), which continues after the completion of the switching, is carried out. During the movement of the suction chamber 7 from the limiting stop .12 to the stop 13, the inner surface of the filter septum is cleaned. 6 from contamination. At the moment of contacting the suction chamber of the limiting abutment 12, the reverse flow of the liquid is blocked by the cover 14. Next, the suction chamber 7 is stationary until the filter septum 6 reaches the maximum degree of contamination.

The processes described are periodically repeated at a frequency determined by the content of suspensions in the original.

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Since most of the time of the filter operation, the suction chamber 7 is not moving and no liquid is discharged, the proposed design will increase the durability and reliability of the filter, as well as reduce the loss of fluid for flushing.

Claims (1)

The formula of the invention and the Self-cleaning fluid filter, comprising a housing with inlet, outlet and discharge nozzles, divided by a cylindrical filter partition into the initial and clarified fluid chambers adjacent to the filter partition from the source fluid chamber, a suction chamber made in the form of a hollow with an annular cutout on side surface of the piston, installed with the possibility of reciprocating movement, characterized in that, in order to increase the operational reliability due to the reduction of wear of the rubbing surfaces, it is equipped with an automatic distribution unit of the initial liquid, a shut-off organ in the form of a hermetic cover covering the surface of the filter septum around the perimeter in places, the extreme positions of the suction chamber and a hollow brush, 10 by means of which the extraction chamber is connected to the discharge nozzle, while the housing is provided with an additional input nozzle, the input nozzles are located at opposite ends 15 of the filter septum, and the unit for automatic distribution of the initial fluid — between the inlet nozzles.