SU1493286A1 - Self-cleaning filter - Google Patents

Abstract

The invention relates to filtration and can be used for the purification of natural and waste waters in the chemical, metallurgical, pulp and paper and other industries. The purpose of the invention is to increase the efficiency of washing the filter element and reducing the flow rate of the washing liquid. The self-cleaning filter comprises a housing divided by a flat filter element into chambers of the initial and purified liquid, a backwash device made in the form of a hollow shaft coaxially mounted to the filter housing with a duct for cleaning the filter element, and a soothing element made in the form of a groove rigidly connected to the hollow shaft installed in the chamber of the purified liquid under the box. New in the filter is the provision of the depressant element with an acoustic emitter installed inside the chute under the duct, and the chute is shifted in the direction opposite to the direction of the duct movement. 2 Il.

Description

The invention relates to filtration and can be used for the purification of natural and waste waters in the chemical, metallurgical, pulp and paper and other industries.

The purpose of the invention is to increase the efficiency of washing the filter element and reducing the consumption of industrial liquid.

FIG. 1 shows a filter, a general VIEW} in FIG. 2 shows a section A-A in FIG.

The filter includes a housing 1, divided by a flat filter element 2 into chambers 3 and 4 of the original and purified liquid, a backwash device 5 made in the form of a hollow shaft 7 coaxially mounted in the housing and connected to a drive 6, on which the cleaning box 8 is rigidly fixed, connected by a flexible hose 9 to the cavity of the shaft 7. In the chamber 4 of the purified liquid under the filter element 2 opposite the box 8 a sedative element 10 is installed,

made in the form of a groove 11, rigidly connected to the hollow shaft 7. The soothing element is provided with an acoustic emitter 12 installed in the groove 11 under the duct 8, while the groove is offset relative to the radial axis of the duct opposite to f

WITH WITH GS

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the direction of its movement (Fig. 2). The housing is equipped with nozzles 13 for supplying the initial liquid, 14 - discharging purified liquid. The hollow shaft 7 through the valve G5 is connected to the atmosphere. To determine the pressure drop across the filter element, the filter is equipped with pressure gauges 16 and 17. The acoustic emitter is a flat magnetostrictive emitter connected to a source of ultrasonic vibrations (not shown).

The self-cleaning filter operates as follows.

The cleaned fluid through the nozzle 13 is pumped into the chamber 3 of the source liquid, passes through the filter element 2, enters the chamber 4 of the purified liquid and exits through the nozzle 14. As the filter element 2 becomes dirty, the pressure drop recorded by gauges 16 and 17 increases.

Upon reaching the pressure drop of the Dissolved value, the actuator 6 of the washer device simultaneously turns on, the acoustic emitter 12 is put into operation and the valve 15 opens, connecting the shaft 7 to the atmosphere. The casing box 8 begins to rotate, while cleaning the filter element 2 with a flow of washing liquid, which occurs due to the pressure difference in the filter housing 1 and the hollow shaft 7. At the same time, under the action of ultrasonic vibrations created by the acoustic emitter 12, a directed flushing flow occurs, to the oscillations of the filtering mesh of the filter element 2 (in this case, with an increase in the intensity of the washing, the disturbance fluctuations of the washing flow increase), as a result of which an intense disturbance occurs precipitate of engagement with the filter element and its destruction. The liquid of the forma- rium wash is taken from the depressant element 10, which is displaced in the direction opposite to the direction of movement of the box 8. This allows the washing liquid to enter the cavity of the chute 11, filtered through the cleanest washing holes 18 of the filter element 2 located behind the flushing box 8 in the direction of its movement, thus providing the maximum flushing flow rate

P

to

15

20

25

thirty

.

 , 50, -55

35

40

45

fluid. The rinsing liquid passing into the cavity of the box strikes the bottom of the box, the flow rate is quenched and its direction is changed, and the walls of the chute 11 isolate the liquid in it from the total filtrate flow.

When the pressure drop on the gauges 16 and 17 decreases to a predetermined value, the valve 15 closes and the actuator 6 of the industrial unit 6 and the acoustic emitter 12 turn off at the same time.

The invention allows to achieve an increase in the efficiency of washing the filter element, reducing its duration and reducing the consumption of industrial water due to the intensification of the washing process under the influence of ultrasonic vibrations created by the acoustic emitter, contributing to the separation of sediment from the surface of the filter element and its destruction. The displacement of the chute of the sedative element in the direction opposite to the direction of movement of the box allows to achieve maximum washing intensity, which also contributes to the separation of the sediment from the surface of the filter element and its removal outside the filter, reducing the washing time and, ultimately, reducing the flow of industrial water.

Claims (1)

Invention Formula A self-cleaning filter comprising a housing divided by a flat filter element into the chambers of the original and purified fluid, a backwash device made as installed coaxially with the hollow shaft casing with a cleaning duct, and a soothing element mounted in the purified liquid chamber under the duct and made a groove rigidly connected to a hollow shaft, characterized in that, in order to increase the efficiency of washing the filter element and reducing the consumption of washing liquid, the sedative element provided with an acoustic emitter installed inside the chute under the duct, while the chute is offset relative to the radial axis of the duct in the direction opposite to its direction of movement. Editor M. Bandura  Phie. 2 Compiled by A. Evdokimov Tehred M. Didyk Proofreader O. Kravtsov