SU915888A1 - Nutsche filter - Google Patents

Description

The invention relates to filtering, in particular to liquid filters intended for the separation of suspensions in the chemical and other industries.

Known suction filter, comprising a housing, a cover, a false bottom with a central hole. The filter is equipped with a stirrer consisting of a traverse, scrapers and a agitator entering the central hole of the false bottom. For unloading the sludge, the mixer and the agitator from individual drives receive rotational and axial displacement Γι 3.

The disadvantage of the filter is a low sanitary condition at the filtering site, due to the fact that the receiving tank for sludge is well below the bottom of the filter, and the agitator, rotating with the agitator blades, is lowered down through the central hole, while the particles of sludge,

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Sticking to the agitator, leaving the central hole, are thrown aside by centrifugal force and contaminate the filtration area. The filter also has low reliability when unloading sediments prone to sticking and pelletizing. The material sticks to the agitator, clogs the center hole,

₁₀ and, as a result, the sediment is not discharged from the filter, in addition, it is additionally compacted with stirrer scrapers, which continuously descend during its rotation. This leads to a. breaking the drive., its elements or stopping the motor.

The purpose of the invention is to improve the reliability of the filter by improving the discharge of precipitation.

This goal is achieved by the fact that the suction filter, comprising a housing with a false bottom and a central hole for unloading sediment and a stirrer, including a drive shaft with a crosspiece

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and scrapers and a rotating sleeve, equipped with a knife mounted for movement along the generatrix of the central opening for discharging sediment and connected to the rotating sleeve of the agitator.

It is advisable to make a false bottom tapered with a taper of 7 “1П®, ι and set the scrapers parallel to the false bottom.

Such a filter design significantly improves the cutting conditions for the sediment layer, transporting it to the central opening and unloading. This is achieved by the fact that the knife cuts a central hole in the sediment through which it is cut by scrapers _; the top layer of sediment on the natural cone is unloaded from the filter.

Due to the fact that the knife receives a rotational movement and does not extend beyond the edges of the central hole in the bottom, it becomes possible to bring the precipitation tank to the filter, eliminate the spread of sediment by the centrifugal force of the rotating knife, and improve the sanitary co-operation. standing at the filtration site. ·

FIG. 1 shows the filter, a general view; in fig. 2 - _O section A-A in FIG. one; in fig. 3 "node I in figure 1.

The filter consists of a housing 1, a removable cover 2 and a conical bottom 3 · Inside the housing 1 there is a false bottom 4 with a taper of preferably 7 “10 °" on which a filter element (not shown) is mounted. In the bottom 3 there is a discharge opening 5 for removing the sediment, tightly closing the hinged lid 6. The hinged lid 6 is provided with a false bottom; 7 and fitting 8 to remove the filtrate. Inside the housing 1 there is an agitator consisting of the yoke 9, struts 10 and scrapers 11. The scrapers 11 are spaced differently from the axis of rotation so that they cover the entire area of the false bottom 4, have the shape of a blade and are parallel to the false bottom 4. To facilitate unloading sediment the mixer is equipped with a knife 12.

Traverse 9 is rigidly connected to the screw shaft 13, driven in rotation from the reversing engine 14 through the worm pair 15 and the sleeve 16. The screw shaft 13 and the sleeve 16 are interconnected by means of a splined connection and have the possibility of relative axial movement. The sleeve 16 through the bearing units 17 is mounted in the support 18. The axial movement of the shaft 13 associated with it

5 by a traverse 9 and fixed on the last scrapers 11 is carried out by means of a nut 19 "rigidly connected to the support 18 through the bearing cover 20, on the removable filter cover 2

there is an inspection hatch 21 and a pipe 22 for loading the pulp. The filter is discharged from the housing through fitting 23.

The filter works as follows.

5 Through the nozzle 22 'into the body of the pulp is poured. The filtrate using a vacuum through the filter element, the false bottom 4 and fittings 23 and 8 are removed from the apparatus. After the windows [filtering vacuum, turn off the vacuum, open the hinged cover 6 of the discharge opening 5 and turn on the engine 14. From the engine 14 through the worm pair 15, the sleeve 16 and the slotted

> 5 connection, rotation is transmitted to shaft 13 and yoke 9 rigidly connected to it with scrapers 11. Screw shaft 13, in contact with nut 19, rigidly connected to support 18 through bearing 10, to no other cover 20, performs additional axial spiral movement, raking up sediment to center hole 5.

The knife 12, rigidly connected with the sleeve ₍₅ Koy 16, which through the bearing assemblies 17 is connected to the support 18, performs only a rotational motion, cutting through the hole in the sludge through which as the scraper 11 is lowered

The sediment is gradually cut off from the upper layers, moves to the center and is discharged. ”The conical shape of the false bottom 4 and the same arrangement of the scrapers 11 facilitate

₍₅ discharge of sediments prone to pelletizing and sticking.

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After lowering the scrapers stirrer until the filter member and discharging the entire sludge is recycled to the mixer ⁵⁰ uc Khodnev (upper) position by reversing the motor 14. The hinged lid 6 of the discharge opening 5 is closed and the filter is ready for re-use.

The invention allows to increase the reliability of the filter, to improve the discharge of precipitation and sanitary condition on the filtration area,

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Claims (3)

Claim m 1. A net filter, comprising a housing with a false bottom and a central hole for discharging sediment and a stirrer, $ including a drive shaft with a cross bar and scrapers and a rotating sleeve, characterized in that, in order to improve the reliability of the filter by improving the discharge of the siege The filter is equipped with a knife mounted for movement along the generatrix of the central opening for discharging sediment and connected to the rotating sleeve of the agitator. 15 2. The night filter π. 1, which is based on the fact that the false bottom is conical and the scrapers are installed parallel to the false bottom. 3. The night filter for l. 2, according to the fact that the conicity of the false bottom is 7 “U®.