SU1456185A1 - Pressure screen filter - Google Patents

Abstract

The invention relates to filters for water purification from suspended impurities and allows to intensify the process of regeneration of the filtering surface and increase the performance of the filter. The regenerating device is installed along the axis of the cylindrical filter element 5 and is made in the form of a pipe 10 with openings on the side surface, inside of which is a swarm of spring-loaded pistons 16, interconnected by a rod 17. The lower piston 22 is connected to J5 N о (Л с: и ate 00 ate ha

Description

the plunger 24, which overlaps the lower hole in the bottom of the pipe 10, and is made stepped, and the upper piston is connected by a rod with a spool 21 of smaller diameter, installed in the upper part of the regenerating device, made in thick-walled

inverted station 11. The regeneration of the filtering web is carried out by the action of a shock wave and hydrodynamic flow, which are formed during the exhaust of compressed air from the openings of the pipe 10 during periodic operation of the piston systems. 1 silt

one

The invention relates to the purification of liquids from suspended and other impurities and can be used in industrial water supply systems and in chemical technology

The purpose of the invention is to intensify the process of filter regeneration.

The drawing shows the filter, a longitudinal section.

The filter consists of a sealed vertical housing 1, in which the conic spam collector 2 is adjacent to the lower part, and the housing is closed from above with a rivet 3. On the inner flange 4, welded to the side surface of housing 1, a cylindrical filter element 5 is rigidly mounted of the subdued frame covered with mesh cloth 6. To prevent the mesh from collapsing by a radial flow of water with considerable kinematic energy, the upper part of the lateral surface of the filter element is made shnoy. The filter element 5 separates the filter cavity into the chamber 7 of the source liquid and the chamber 8 of the filtrate. Rings 9 are attached to the side surface of the housing, which serve to turbulize the tangential fluid flow.

The axis of the filter element is set to a center pipe 1C, the upper part of which is made in the form of a thick-walled inverted cup 11, the cavity of which is connected by a radial channel 12 to the filtrate chamber and channel 13 to a pipe 14 for supplying compressed air equipped with an electromagnetic valve 15, B as a source of compressed air can be used compressor, pneumatic line.

cylinders with compressed gas (. nitrogen, oxygen, etc.,),

Inside the pipe 10, pistons 16 are mounted, interconnected by means of rod 17 and closing holes 18, which are located annularly on the side surface of pipe 10. The number of pistons 16 is selected depending on the length of the filter element 5, taking into account that the cleaning zone of the section The mesh surface located opposite to the holes is 0.5-0.8 times the diameter of the filter element. Through holes 9 are made in the pistons 16, leveling the pressure of the compressed air in the space between the pistons.

The upper piston 1.6 is connected by an additional rod 20 with a spool of smaller diameter 21 installed inside the cup 11. The lower piston 22 is made stepped, i.e. consists of two parts of different diameters, with a part of the smallest piston located on the top and adjacent to the annular section 23 in the pipe 10, the piston 22 is connected to the plunger 24 that covers the hole in the thickened bottom of the pipe 10, a spring is installed between the piston and the bottom of the pipe 10 25, pressing the interconnected pistons 16. To the annular protrusion 23.

The filter is equipped with nozzles for supplying the source fluid 26, for draining the filtrate 27 and for draining the sludge 28,

The filter works as follows. The fluid to be cleaned is supplied under pressure through the nozzle 26 into the inside of the filter, spreads around

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15

  . 14561 "5 of the filtering element 5 and partially moving downward along the mesh surface 6, flushing delayed soils, and partially filtering through the mesh fabric 6 that surrounds the filtering element, and cleaned is brought out through the nozzle 27.

The tangential flow of the initial fluid cannot ensure complete washing of the filtering mesh 6 from the retained contaminants, especially oils and fibrous materials. In connection with this, periodic additional cleaning of the silted net surface by the hydrodynamic action of the shock wave is carried out. When the pressure losses on the grid are acceptable, valve 15 is supplied with electric current, it opens and compressed air (gas) flows through pipe 14, passes through channel 1.3 in the mill 11 into the upper part of the pipe 10 and through holes 19 in the pistons x 16. Under the pressure of the compressed gas on the lower piston 22 and the pressure of the water acting on the spool 21, the piston 22, overcoming the resistance of the spring 25 and the resistance of water pushed through the annular gap between the plunger 24 and the bottom of the pipe 10, is pressed down at a low speed.

At the moment when the plunger 24 extends beyond the hole in the bottom of the pipe, and the upper part of the lower piston 20

25

At the time of opening of the exhaust holes, the channel is blocked by gold 21, and the supply of compressed gas to pipe 10 is stopped. After exhausting the compressed gas, the pressure of the gas in the pipe 10 decreases sharply and under the action of the spring the pistons 16 move upward, occupy the initial position, after which, in the sequence, the following pneumatic explosions take place until the valve 15 closes

Removed from the mesh surface of the filter element, the dirt accumulates in the spam collector 2, and then periodically leaves when the valve is opened at the nozzle 28.

Turning on or off of the valve 15 and, accordingly, the supply of compressed air and the reproduction of pneumatic sprays can be done either manually or by contact differential manometer fixing the loss of pressure on the filter element, which ensures complete automation of the filter operation.

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Thus, in the proposed filter, the translational motion of the piston system is produced as under the action of compressed air, which spreads quickly over a large area of the lower piston, as well as the pressure of the liquid acting on the spool in the upper cylinder, 7 - o-, gt, o- - v .. and a well cylinder, thanks to the 2 nd end of the speech, the gift of which is provided by the fast pepa JL rjTTlPnp T TLO te ntitinrf t. ":; .. -i Аt w% .. Ж1

Pa .23, the hole in the bottom of the pipe 10 opens, the hydraulic resistance decreases significantly, the pressure of the compressed gas spreads over the whole area of the piston 22, which is. leads to a dramatic increase in pressure force on him. Under the action of these factors, the pistons 16 connected by the plunger 17 almost instantly lower and the exhaust ports 18 open synchronously. Through these holes, a simultaneous exhaust of the compressed gas occurs, and a shock wave and its associated fluid flow (hydraulic flow) are formed. The shock wave and hydraulic flow pass through the mesh fabric 6 of the filtering element 5, stretch it and shed the contaminants detained during the filtration process; C: his-; surface. The final removal of contaminants is produced by a stream of source water that moves along the filter element.

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piston movement and almost instant opening of exhaust ports. The piston speed also increases due to the fact that the proposed filter uses a weaker return spring compared to the known filter, since after the pneumatic explosion the compressed air supply stops: its residual pressure in the pipe is minimal and to set the piston system to the initial position little effort is required.

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In this connection, the amplitude of the shock wave arising during pneumatic explosion is 1.15–1.20 times the maximum pressure of the shock wave in the well-known filter. An increase in the pulse pressure acting on the filter element ensures its more efficient cleaning, which allows an increase in the speed of the filter.

15

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At the time of opening of the exhaust ports, the channel is closed by the spool 21, and the supply of compressed gas to the pipe 10 is stopped. After exhausting the compressed gas, the pressure of the gas in the pipe 10 decreases sharply and under the action of the spring the pistons 16 move upwards, take the initial position, after which the following pneumatic explosions are performed in this sequence until the valve 15 closes.

Removed from the mesh surface of the filter element, the dirt accumulates in the spam collector 2, from which it is periodically displayed when the valve is opened at the nozzle 28.

Turning on or off of the valve 15 and, accordingly, the supply of compressed air and the reproduction of pneumatic sprays can be done either manually or by contact differential pressure recorder fixing the loss of pressure on the filter element, which ensures complete automation of the filter operation.

Thus, in the proposed filter, the forward movement of the piston system is produced as under the action of compressed air, which rapidly spreads over a large area of the lower piston, as well as by the pressure of the fluid acting on the spool in the upper cylinder, good-v. fast pedar is ensured, which ensures fast w% transfer.

piston movement and almost instant opening of exhaust ports. The piston speed also increases due to the fact that the proposed filter uses a weaker return spring compared to the known filter, since after the pneumatic explosion the compressed air supply stops: its residual pressure in the pipe is minimal and to install the piston system in the initial position a slight increase is required.

In this connection, the amplitude of the shock wave arising during pneumatic explosion is 1.15–1.20 times the maximum pressure of the shock wave in the well-known filter. An increase in the pulse pressure acting on the filter element provides for its more efficient cleaning, which makes it possible to increase the filtration speed and productivity by 5-10%.

Claims (1)

Invention Formula Pressure screen filter containing a sealed vertical housing, nozzles for supplying the source liquid and draining the filtrate, a mesh cylindrical filter element dividing the case into chambers for the source liquid and for the filtrate, and a regeneration device made in the form of a central tube with a nozzle for supplying compressed of air and holes on the side surface mounted inside the pipe on the rod of spring-loaded pistons and plun Composite S. Krasnoselsk Editor M.Blanar Tehred L.Oliynyk Order 7481/9, Circulation 600 Subscription VShPI State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and printing company, Uzhgorod, st. Project, 4 A piston attached to the lower piston, characterized in that, in order to intensify the regeneration process, the upper part of the central tube has the form of a thick-walled inverted, in the walls of which channels are made to communicate the inner cavity of the cup with the chamber filtrate and nozzle for feeding compressed air, equipped with a spool, connected by means of an additional, additional stem to the upper piston, and the lower piston is filled with stepwise decreasing in the upper diameter, and the central tube on the inner surface has annular projections. Corrector S.Cherni