SU1209255A1 - Belt filter - Google Patents

Description

2. The filter press according to claim 1, characterized in that the pre-filtering chamber is provided with spring-loaded supports for supporting the sealing element, the lower ones of which are made of rotary and the upper ones in the form of adjusting screws installed with threaded sleeves that interact with springs.

3. A filter press according to claim 1, characterized in that a screw pump is used as the source of supply of the material to be dried.

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The invention relates to filtration and can be used in chemical and other industrial fields for the separation of solid-liquid suspensions.

The aim of the invention is to increase work efficiency by reducing energy consumption and self-cleaning of the pre-filtering chamber.

FIG. 1 shows a belt filter press; general view; in fig. 2 — node 1 in FIG. 1, the cut; in fig. 3 shows section A-A in FIG. 2

The belt filter press contains a frame on which drive and squeeze rolls 2-7 are mounted, covered by infinite filter belts 8 and 9.

A prefilter chamber 10 is also mounted on par 1, which is hydraulically connected via a tube 11 to a slurry feeder 12. Under chamber 0 there is a tray 13 for receiving pre-compacted sludge for dehydration and a dewatering chamber 14 associated with a vacuum suction system 15 and a drain pipe 16 for the filtrate discharged to a vent. Frame 1 also has an unloading device 17 for removing the dried final cake and an actuator 18 connected via a chain gear 19 to the drive roller 2. Tension devices 20 are provided with a constant force to tension the filter belts 8 and 9 21.

The pre-filtering chamber 10 is closed on top by a removable airtight lid 22 with a sleeve 23 fixed on it and rigidly mounted on the frame 1 in an inclined position.

4. The filter press according to claim 1, characterized in that an outlet is installed in the lower part of the bottom, passed through the casing in the direction of the filter belt and equipped with a sealing bellows, and the cavity between the bottom of the sealing element and the casing is hydraulically connected through the drain a pipe with a dewatering chamber, while the bottom is made in the form of a shpaltovy sieve.

5. The filter press according to claim 1, characterized in that the closed casing is provided with an upper lid with a sleeve and a feed connection hinged in it.

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To supply the initial sludge in a tube 1 1 into the chamber 10, a hinged-mounted supply nozzle 24 is provided. Inside the chamber 10, a sealing element 27 is installed on the spring-loaded supports 25 and 26.

To ensure reliable operation of the pivot bearings 25, they are sealed with elastic bellows 28. The stiffness of each

From the installed upper part of the sealing element, the four spring-loaded supports 26 can vary over a considerable interval by adjusting screws 29, which ultimately leads to a change in the stiffness of the suspension of the sealing element 27 and, consequently, to a change in the frequency and amplitude of its oscillations. To prevent the adjusting screws 29 from self-unscrewing, locknuts 30 are provided. Sealing element 27 is provided with a perforated

a bottom 31 with a profiled wall 32. In the lower part of the bottom 3i, made in the form of a mesh screen, an outlet nozzle 33 is installed. A protective seal of the bellows 34 is installed between the outlet nozzle GU 33 and the body of the pre-filtering chamber 10, and on the lower part, a drain pipe 36, which is hydraulically connected to the drain pipe 16 for the filtrate discharged to the discharge. The lower end of the feed nozzle 24 is made in the form of a slit nozzle 37. The adjustment screws are made with shoulders 38 that interact with the springs 39.

Belt filter press works as follows.

From the actuator 18, the rotation is transmitted through the chain transmission 19 to the drive roller 2, which, due to the use of frictional forces, causes the filter belts 8 and 9 to move. The initial suspension from the loading device 12 with a screw pump (not shown) flows through the slit nozzle 37 of the feed nozzle 24 to the profiled wall 32 of the sealing element 27. At the same time, the stream of the initial sediment pulsing through the slit nozzle 37 hits the profiled wall 32 of the sealing element 27 and leads the latter into an oscillatory motion. This speeds up the filtering process, improves the quality of compaction of the sludge and facilitates self-cleaning of the sealing element 27. Predetermined preload forces of the spring-loaded supports 26 set by adjusting screws 29 make it possible to set the optimum amplitude and frequency of oscillation for the sealing element 27 to work. If necessary, sampling of the pre-compacted sludge and for monitoring the effectiveness of its pre-compaction use a cage 35. In the cavity between the bottom of the sealing element 27 and the bottom of the chamber 10, a filtrate is collected, which then through the drain pipe 36, hydraulically connected to the drain pipe 16, discharged to reset. The pre-compacted sludge through the outlet 33 enters the tray 13 on the filter belt 8 for further dewatering.

 With the passage of the filtering belt 8 above the dewatering chamber 14, the sludge dewatering occurs mainly due to the filtrate suction by the vacuum system 15, and after the roll 4, the increasing pressure of the belt 9 is added to the sludge sealing layer, which further dewaters it. After the roll 3, the sediment is rotated by 180 ° with a further increase in the force effect on the compacted sediment layer located between the belts 8 and 9. In the area of the squeeze rolls 6. As the squeeze rolls 6 pass through, the compacted sludge is removed from the filter belt 9 by unloading device 17, which is made in the form of a removable caprolon knife.

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Claims (5)

1. TAPE FILTER-PRESS, containing a frame with endless filter tapes mounted on it, passed through drive and squeeze rolls, a loading device made in the form of a tube connected to a dehydrated material supply source ending with a flat nozzle, a pre-filter chamber located at an angle to a dehydration chamber, and an unloading device, characterized in that, in order to improve work efficiency by reducing energy consumption and self-cleaning the chamber Yelnia filtering, the latter is designed as a closed casing in placed sealing element provided with a perforated bottom and with a profiled wall installed in the housing with the possibility of oscillating motion, the flat nozzle is mounted above the loading device shaped sten-> _a Coy chamber prior SS Nia by filtration. FIG. 1> 2. Filter press according to π. 1, characterized in that the pre-filtering chamber is equipped with spring-loaded bearings to support the sealing element, the lower of which is made rotary, and the upper - in the form of adjusting screws installed in the threaded bushings with collars interacting with the springs. 3. The filter press according to claim 1, characterized in that a screw pump is used as a source of dehydrated material. 4. Filter press according to π. 1, characterized in that in the lower part of the bottom there is an outlet pipe, passed through the casing in the direction of the filter belt and equipped with a sealing bellows, and the cavity between the bottom of the sealing element and the casing is hydraulically connected through the drain pipe to the dewatering chamber, while the bottom is made in the form of a split sieves. 5. Filter press according to π. 1, characterized in that the closed casing is provided with a top cover with a sleeve and a supply pipe pivotally mounted therein.