SU1380762A1 - Filter-press of piston type - Google Patents

Abstract

The invention relates to the field of separation of inhomogeneous liquid mixtures into liquid and solid phases and allows an increase in filtrate productivity. The filter press includes a working cylinder 1 with a filtrate collection chamber 12 placed in it, a central filtrate drain pipe 13, a filtrate drain cutoff 14 and an eccentric disk 16 on the central pipe 13. The cutter is made in the form of a cork valve with a gear flywheel 15, the eccentric disk is equipped with four flat gear racks arranged in pairs at the greatest and smallest distances from the axis of rotation of the disk along the arcs of vertical angles with the ratio of the central angles of the arcs and the angle of displacement of paired gear racks from 1: 2.5 to 1: 3.5. The working cylinder 1 is made in the form of a package with prefabricated chambers connected in series with a common central tube 13. 1 Cp. f-ly, 2 ill., 1 tab. (L

Description

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The invention relates to the separation of heterogeneous liquid mixtures into liquid and solid phases and can be used to dewater sediments formed during the physical and chemical treatment of natural and waste waters, as well as in the chemical, food and other industries.

The purpose of the invention is to improve the performance of the filtrate.

FIG. 1 shows a piston type filter press, general view; in fig. 1 shows section A-A in FIG. 1 (location of the cork valve with a toothed flywheel and flat toothed racks of an eccentric disk).

The filter press contains a package of working cylinders 1 with valves 2 and 3 for supplying the initial sludge and valves 4, 5 for removing the dried mass. Inside the cylinders 1, pistons 6 of double-sided filtering action are movably arranged, consisting of perforated plates 7 and 8, fixed at a fixed distance by means of intermediate rings 9, covered with filtering material 10 and 11. The internal cavity of each piston 6 forms a collecting chamber 12 of filtrate Pistons 6 are connected in series with a common movable central pipe 13 of the filtrate outlet, on which a cutter 14 is installed, made in the form of a cork valve with a gear flywheel 15. A disk 16 eccentrically placed on drive with a bearing, is rigidly connected to the central tube 13. The disk 16 is equipped with four flat toothed racks 17-20 of the actuator of the shutter 14 arranged in pairs: rails 17 and 18 at the smallest, and rails 19 and 20 at the greatest distance from the axis of rotation eccentric disk along the arcs of vertical angles with interconnection of the central angles of the arcs and the angle of displacement of the pair of gear racks 17 from 18 and 19 from 20 in the interval from 1: 2.5 to 1: 3.5.

The table presents data on the filter press performance depending on the ratio of the central angles of the arcs along which the pair of gear racks are located and the angle of displacement of the pair of gear racks.

Filter press works as follows.

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The pistons 6 are in the extreme right position. The initial sludge to be dehydrated enters the cylinders 1 through open valves 2. Valves 3-5 are closed. The left parts of each working cylinder 1 package are filled with the initial draft. Previously, the filtrate fills the collecting chambers 12. This corresponds to the moment when the central tube 13 is shut off by a cutter 14. position The beginning of the contact of the toothed rack 18 with the toothed flywheel 15 of the trimmer 14 corresponds to the moment when the pistons 16 start to move from the rightmost position to the left. In this case, the execution of the trimmer 14 in the form of a cork valve with a toothed flywheel 15, rotated by toothed racks located on the disk 16, ensures a reliable and productive filter press.

Pistons 6 begin to move to the left (from the rightmost position to a value of 0.25-0.3 piston stroke length). The cutter 14 is closed.

As the pistons 6 move, the filtration through the clean material 10 proceeds, the pressure in the filtrate collectors grows, and it rushes through the perforated plates 8 and the filter material 11 into the right parts of the working cylinders 1. This regenerates the filter material 11 by flushing it back current filtrate due to the pressure difference inside and outside the collection of 12, i.e. left and right of the filter material 11.

Pistons 6 pass the remaining 0.7–0.75 stroke. The gear flywheel 15 of the shutter comes into contact with the toothed rack 17. At the same time, the cutter 14, when turned, opens. As the pistons 6 move, a separation takes place on the dehydrated sludge filtered on the filter material 10 and the filtrate passing into the collecting chambers 12 and then into the common central pipe 13. When the pistons 6 approach the leftmost position, the dehydrated sludge removal springs 4 open

which is adjusted to elevated pressure, and the dewatered sludge is removed to a tank (not shown). The pore 6 passes to the extreme left position. This corresponds to the closing time of the trimmer 14, which occurs when the gear flywheel 15 is turned while it is in contact with the moving gear rack 20. The shutter 14 is closed. Valves 3 for supplying the initial sludge open. Pistons 6 begin to move to the right. The filtering material 10 is regenerated during the time while the formations 6 pass through 0.25-0.3 of their stroke, counting from the extreme position. The toothed flywheel 15 is then clipped off by a slam-shutter 14, turned by the moving gear rack 19 and the slam-shutter 14 opens. The cycle is repeated. The full cycle of operation of the apparatus consists of the movement of the pistons 6 to the right and to the left.

At the same time, an increase in productivity with high-quality regeneration of the filtering material 10 and 11 is achieved at ratios of the central angles of the arcs along which paired flat racks 17, 18 and 19, 20 are located and the angle of displacement of pairs

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gear racks in the range of 1: 2.5-1: 3.5.

Claims (2)

1. A piston-type filter press that includes a working cylinder with a combined filtrate collection chamber placed in it, a central filtrate drain pipe, a filter drain shut-off valve and an eccentric disk on the central tube, so that the filtrate, the cutter is designed as a cork valve with a toothed flywheel, the eccentric disk is equipped with four flat toothed racks arranged in pairs at the greatest and shortest distances from the axis of rotation Drive along the arcs of vertical angles when the ratio of the central angles of the arcs and the angle of displacement of paired gear racks from 1: 2.5 to 1: 3.5. 2. Filter press according to claim 1, characterized in that the working cylinder is made in the form of a bag with assembled chambers connected in series with a common central tube. The ratio of the central angles of the arcs along which the pair of gear racks are located, and the angle of displacement of the pair of gear racks eleven 1: 1.5 1: 2 1: 2.5 1: 3 1: 3,5 1: 4 1: 4,5 1: 5 Filter press capacity, h on initial draft I by filtrate 29.3 30.7 31.9 36.9 40.7 37.2 29.9 28.5 28.0 X9 gfueZ