RU2153914C1 - Liquid cleaning filter - Google Patents

Abstract

FIELD: filtration; mechanical engineering; mining-and-concentrating, chemical and other industries. SUBSTANCE: filter has two vacuum chambers which are embraced by endless filtering tape. Chambers are located directly in reservoir filled with liquid to be cleaned. Coarse filtrate is filtered to first (in way of motion of tape) chambers located inside other chamber; coarse filtrate is again fed to reservoir filled with starting liquid which is connected with this chamber by means of branch pipe. Filtration of liquid by second chamber is effected through filtering tape and sediment adhering to it after first chamber. Preliminary cleaning of starting liquid and filtration through sediment enhanced efficiency of filtration; fine filtrate formed in second chamber is removed through suction branch pipe. Regeneration unit is located above chambers. Filtering tape rising from liquid with sediment adhering to it is dried and sediment is removed. EFFECT: enhanced efficiency of cleaning. 1 dwg

Description

 The invention relates to filtering and can be used in mechanical engineering, mining, chemical and other industries for the purification of liquids from mechanical impurities.

 The known filter for cleaning liquids from mechanical impurities (AS USSR N 1604408, 01 D 33/04), adopted for the analogue, contains a reservoir that is divided by a perforated partition into two chambers: the upper one for the initial liquid, and the lower one for filtrate. The lower chamber through the outlet of the filtrate is connected to the pump. On the perforated septum is a filter material to provide fine cleaning. The upper chamber has a filter baffle for preliminary cleaning of liquid from large mechanical particles and is equipped with an endless scraper conveyor, which moves large particles from the filter baffle to the special tray with its upper branch. The conveyor carries along the lower branch along the course of its movement the contaminated part of the filter material, removing it from the cleaning zone and replacing it with a clean part. However, the quality of purification of the original liquid through a known filter is not high enough. The disadvantages of this design are, firstly, the impossibility of retaining particles of mechanical impurities, the size of which is smaller than the pore sizes of the filter material, which leads to the removal of a fine fraction in the filtrate, and, consequently, to its contamination, and secondly, the conveyor can carry with it large particles. In addition, the design of the filter is complex and cumbersome.

 Known tape vacuum filter (a. With. The USSR N1107886, 01 D 33/04), adopted as a prototype, containing an endless filter tape divided into cells, connected by inclined piping two vacuum chambers and receivers, a barometric tube immersed in a tank with overflow threshold and connected to the receiver of the first in the direction of movement of the tape by a vacuum chamber, the loading device (tank). The first camera in the direction of travel is located inside another camera. In the known design of a belt vacuum filter, an increase in operating efficiency is achieved by reducing the solids content in the filtrate due to, firstly, the presence of a tank with an overflow threshold with an immersed barometric tube installed at a distance from the loading device above the filter belt; secondly, due to the inclined connecting pipe between the first along the tape moving the vacuum chamber and the receiver in the direction of the vacuum chamber; in addition, the first vacuum chamber is connected to the receiver by a U-shaped elbow with a throttle. The disadvantage of this design is that the filter tape is always used less than half its length for filtration, which reduces the efficiency of the filter. The presence of a receiver, a barometric tube, a vacuum pump leads to design complexity and an increase in dimensions both in height and in length.

 The objective of the invention is to increase the efficiency of the filter while simplifying the design.

 The problem is solved as follows. The filter contains an endless filter belt, a drive shaft and a filter belt tension system, two vacuum chambers in contact with the filter belt, the first of which is placed inside the second along the belt, the filtrate outlet pipes from the chambers, a regeneration unit and a reservoir for the initial liquid. According to the claimed object, the vacuum chambers are placed inside the tank, and the tension system and the regeneration unit are located above the chambers, in addition, the filtrate discharge pipe from the first chamber tape in the direction of travel is connected to the source liquid reservoir.

 The proposed filter design differs from the prototype in that the filtration chambers are located inside the tank; the regeneration unit and the filter belt tensioning system are located above the chambers; the branch pipe for the removal of the coarse filtrate from the first chamber along the belt is connected to the reservoir of the original contaminated liquid. This design of the filter allows you to use one drum for tensioning the tape, and for its drive; eliminates the need for a receiver, a tank with an overflow threshold, a barometric tube, a pipe between the receiver and vacuum chambers, and to create vacuum pressure, use pump suction nozzles for pumping liquids. At the same time, the efficiency of the filter does not decrease, but rather increases. Both chambers are located inside the liquid being cleaned, therefore the filter surface of such a filter is large. Since the first chamber along the belt is connected by a pipe to the reservoir, the previously purified liquid (coarse filtrate) is again cleaned. Filtration of the liquid into the second chamber occurs through the precipitate formed during the first chamber. And since the regeneration unit is located above the chambers, the sediment adhering to the filter belt is separated from it and removed. This design allows the use of a large specific surface area of the filter. In addition, such a design allows for compact structures. The proposed design is easier to manufacture, as it contains fewer nodes and elements.

 The use of such a design allows you to abandon the use of vacuum pumps, and allows you to use the suction pipe of the pumps for pumping liquid to create a vacuum gauge, and their operation is much simpler.

 The essence of the proposed technical solution is illustrated by the drawing, which shows a longitudinal section of the filter.

 Inside the reservoir of the source fluid (further reservoir) 1 is a filter belt 2, the drive shaft of which is located above the liquid level. The filtering material 2 is fixed to the filtering belt 2 - fabric 3. The tension of the filtering belt 2 on the filtrate body is regulated by a tension shaft. 4. The filtrate housing is formed by chambers 5 and 6 separated from each other by a sealed partition. The chamber 6, located inside the chamber 5 and located first along the belt, is connected to the reservoir by a pipe 7. The chamber 5 is connected to a pipe 8 to discharge the fine filtrate. To supply the source of contaminated liquid to the reservoir 1, a pipe 9 is used. The filtrate chambers 5, 6 have perforation over the area of movement of the filter belt 2. The filter material regeneration unit, consisting of an inflection roller 10 and a compressed air supply pipe 11 is placed above the tension shaft 4. Shaft 12 serves to tension the filter material. The tension shaft 4 is connected to the drive 13 by an endless chain 14.

 The filter works as follows. The contaminated liquid is gravity-fed or pressurized into the reservoir 1 through the nozzle 9. The contaminated liquid is pressurized by atmospheric pressure through the filter material 3 on the filter belt 2 into the chamber 6 under the action of the vacuum pressure created by the suction nozzle 7 of the pump. From the chamber 6, the coarse filtrate is discharged into the tank 1. At the same time, a constantly growing sediment layer is formed on the filtering material 3. The filter material, 3 having fallen into the zone of influence of the chamber 5, filters the contaminated liquid through itself and through the precipitate formed throughout the chamber 6. Thus, the filtration efficiency is increased and a fine filtrate is formed in the chamber 5. Material 3, having passed the filtration zone of chamber 5, rises from the liquid along with adhering particles of contaminants. In this zone of passage of material 3, convection drying of the precipitate occurs. When material 3 passes through the regeneration unit, sediment is separated from it. Next, the cycle repeats.

Claims (1)

 A liquid filter containing an endless filter belt, a drive shaft and a filter belt tension system, two vacuum chambers in contact with the filter belt, the first of which is placed inside the second, the filtrate discharge pipes from the chambers, the regeneration unit and the reservoir for the initial liquid characterized in that the chambers are located inside the tank, and the tension system and the regeneration unit are located above the chambers, in addition, the filtrate discharge pipe from the first ry connected to the reservoir of the source fluid.