SU69570A1 - Device for dewatering pulp - Google Patents

Description

Devices for the dewatering of pulp, made in the form of a mesh drum located in a closed casing, with feeding the mass inside the casing under pressure and discharging the dried mass using a stripping scraper, are already known.

According to the invention, in the proposed device for removing the condensed mass from the drum and its retraction, a sealing shuber, mounted in front of and at an angle to the stripping knife in the direction of rotation of the drum, is applied through the pipeline.

For the case of the use of two grid drums by the present invention, there are two descenting scrappers converging at an angle, spaced a desired distance from the drums and forming a gap between them for the passage of a layer of thickened mass, for removing the condensed mass from them.

In accordance with the present invention, the device can be configured, for example, in three variators.

FIG. 1 shows a longitudinal section of an exemplary shape of the first wa26.

device, in FIG. 2-section along the line A-B of FIG. 1, in FIG. 3-section along the line C-D of FIG. 1, in FIG. 4 is a longitudinal section of a second embodiment of the device; FIG. 5 is a cross-section along line E-F of FIG. 4, in FIG. 6 is a longitudinal section of a third embodiment of the device; FIG. 7 is a top view and in FIG. 8 is a cross-section along the edges of the device according to FIG. 7

The device according to the first and second versions is made in the form of a closed casing 7, inside which the mesh drum 2 is rotatably mounted, perforated along the side surface and covered with one or several layers of grids 3 (Fig. 3), of which the thickest is located outside. The drum rotates on the bolster 4 or the support 5 in the casing bottom and the bearing 6 mounted in the outlet pipe for the clarified liquid, equipped with sealing glands.

The mass to be dehydrated is fed under pressure into the casing of the device through pipe 7, in the first embodiment from above, and directed towards the impeller S,

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attached to the net drum, which makes it rotate, and in the second embodiment, in the middle part of the casing, using a reflective visor 9 to distribute the mass flow along the net drum.

The rotating drum is a filter for separating the clarified liquid from the mass, which enters the drum and is brought out through the pipe 6, and the mass adheres to the drum mesh and during its rotation is removed from it by the scraper 70. In order to remove the condensed mass from the net 77 did not mix with the rest of the mass, in front of and in the direction of rotation of the drum and at an angle to the scraper 70 a sealing scraper 72 is installed, between which a closed space 13 is formed to divert the condensed mass through the nozzle 74.

Inside the drum, a perforated drift tube 75 is fixedly fixed, supplying the clarified liquid under pressure to the inner wall of the drum along the line of removal of the layer of condensed mass from the mesh, which makes it easier to separate from the mesh of the thickened mass.

The process of removing the condensed mass from the drum mesh will most satisfactorily occur if the pressure P of the mass entering the tank is greater than the RE pressure inside the drum, and the latter is greater than the pressure P in the space 73 between the scrapers. In order to appropriately regulate the pressure PJ, Pa and RZ, the mass supply nozzle is equipped with a valve 76, the clarified liquid outlet nozzle 77 and the condensed mass output nozzle 78 (Fig. 4, 5).

To monitor the pressure, the reservoir of the device is equipped with a manometer 79, and the nozzle for discharge of the clarified liquid is equipped with a pressure gauge 20.

The grid drum, when performing the device according to the second variant, is set in motion from the electric motor 21 by means of a belt 22 gear 23 gears.

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The device tank is equipped with an inspection hatch 24 (Fig. 3) for observing the correct installation of the removal and sealing scrapers produced by means of set screws 25 and nuts 26.

For discharge from the tank to the outside of the accumulated during start-up, as well as during the operation of air, the tank is equipped with a valve 27.

The device according to the third embodiment, according to FIG. b and 7, is more productive, as it is made with two net drums.

In the closed tank 7 of the device, two grid drums 2 are rotatably mounted, covered with grids 3 and rotated in the opposite direction by means of coupled gears mounted on axes 29 that are outwardly rotated and rotated in bearings 30 supplied with seals. One of the gears 25 is engaged with the drive gear 31 of the worm gearbox 32, driven by an electric motor, not shown in the diagram.

The opposite ends of the drums are provided with nozzles 33 rotating in bearings mounted in lead pipes 34 for clarified fluid filtered by grid drums.

The thickening mass is fed under pressure into the casing of the device through a pipe 36 fitted with an adjusting valve 35 (Fig. 7) and split into two nozzles 37 covered with reflector plates 38.

A layer of condensed mass 39 is deposited on a grid of drums, respectively spaced apart for its passage to the stripping pieces 40, the clarified liquid is filtered out inside the drums and brought out by means of outlet pipes 34 connected to a common outlet pipe 47 equipped with a valve 42.

Inside the drums, the spray pipes 75 are fixedly fixed, feeding under pressure a jet of clarified liquid to the inner wall of the drums along the line along which separation of a layer of condensed mass from the grid occurs.

When the drums rotate, the layers of mass 39 deposited on them (Fig. 8) are intensively squeezed out of moisture by the reciprocal pressure of the drums, after which two Siberian stones 40 are removed from them and output into the space 43 between the scrapers and then through the pipe 44,; devices.

The process of removing masses from baraoans nets best of all occurs when the conditions are met so that the pressure of mass P-j in the casing would be greater than the pressure Pj inside the drums, and the latter is greater than the pressure Pd in the space between the scrapers.

The pressures P, P and Pg are controlled by valves 35, 42 and 45.

A pressure gauge 46 is mounted on the housing to monitor the pressure, and a pressure gauge 47 is mounted on the coarse clarified liquid.

The positioning of the scrapers is done by means of set screws 48 and nuts 49, and the observation is through inspection hatches 50.

Subject invention

Claims (2)

1. A dewatering pulp device made in the form of a mesh drum located in a closed casing with the mass fed into the casing under pressure and discharging the dewatered mass by means of a stripping scraper, so that it is possible to remove from the drum a thickened mass and, its discharge through the pipeline applied a sealing scraper mounted in front of and at an angle to the removal scraper in the direction of rotation of the drum. 2. The form of the device according to claim I for the case of two grid drums, characterized with the use for removing from them the thickened mass of two converging angular scraper, set aside from the drums and forming a gap between them for the passage of a layer of thickened mass. L 8 8 7A AND G FIG. 3 h ( FIG. four 20 FIG. five jJT / 5 f FIG. b "G 27 4 / recounted 1 (f ft- ML /five E- Fig, 7.