RU210203U1 - Drum vacuum filter - Google Patents

Abstract

The utility model relates to suspension purification by filtration and is intended for use in food, chemical, cellulose and other industries. EFFECT: increased reliability and durability of the structure. The utility model discloses a drum vacuum filter, consisting of a tub and a drum, which is mounted on coaxial supports for rotation inside the tub, the cylindrical surface of the drum being made of perforated sheets with a filter cloth. In contrast to the prototype, radially arranged spokes are installed at the ends of the drum, to which the trunnions are attached, while the spoke material used is a material resistant to aggressive environments. 4 w.p. f-ly, 3 figs.

Description

Technical field

The utility model relates to suspension purification by filtration and is intended for use in food, chemical, cellulose and other industries.

State of the art

Known drum vacuum filter disclosed in the RF patent for invention No. 2050171 (priority date: 11/11/1992, publication date: 12/20/1995). The known filter includes a rotating horizontal drum divided into a number of cells with channels connected to a distribution device, including a movable part with concentric holes and a fixed part, which is an annular cavity, divided into vacuum chambers for filtering, washing and dehydrating the sediment, compressed gas chambers for loosening of the sediment and regeneration of the filter partition, a vacuum system consisting of vacuum separators for the main and washing filtrates connected to a vacuum pump, a suspension trough with a stirrer, a device for washing and removing sediment, while the vacuum system is equipped with an additional vacuum pump, while vacuum the separators are connected by separate lines to different vacuum pumps that operate independently of each other.

Each cell of the drum sequentially passes through the zones of filtration, washing and dehydration, sediment removal and regeneration of the filter partition.

Known drum vacuum filter, disclosed in the RF patent for invention No. 2164439 (priority date: 03/07/2000, publication date: 03/27/2001). The well-known filter contains a slurry bath, a hollow shaft with two trunnions lying in bearings mounted in the slurry bath frame, shaft drive sprockets mounted coaxially on the shaft, distribution heads at the ends of the shaft, a drainage surface covered on the outside with a filter partition, a sediment removal knife, sediment receiver.

At the same time, the hollow shaft inside is divided into independent sectors, at one of the pins on the shaft, a hollow disk divided into sectors is coaxially fixed with a system of drainage channels connected to the independent sectors of the shaft, and an outer drum with internal drainage channels and an additional internal drainage surface, open from the opposite side. end face, and coaxially to the outer drum, several drums of smaller diameter are fixed on the disk, also with internal drainage channels, external and internal drainage surfaces, while all drainage surfaces are covered with filter partitions, each filter partition has an autonomous sludge removal knife, and the sludge is discharged into conveyors placed from the side of the open end parallel to the filter axis.

A continuous drum filter is known for filtering a liquid such as a solution containing a residue disclosed in the RF patent for invention No. 2271853 (priority date: 04/26/2001, publication date: 03/20/2003). The known filter contains a cylindrical drum with a horizontal axis, having a longitudinal section of a rectangular shape with a vertical wall, a cylindrical wall and an axial hole bounded by an annular side that continues the cylindrical wall, a plurality of filter elements, a system for supplying a liquid to be filtered, a system supplied through the specified hole inside the drum. a sludge removal system, a filtrate removal system, and a fluid supply unit.

A drum vacuum filter is known, disclosed in the source https://www.muctr.ru/upload/iblock/31d/Spring_16th_lecture.pdf (Lecture No. 16 “Filtration”, Russian Chemical-Technological University named after D.I. Mendeleev). The known filter has a rotating cylindrical perforated drum covered with a metal mesh, on which the filter cloth is located. The drum is 30-40% of its surface immersed in the suspension located in the trough, repeating the shape of the drum. To prevent sedimentation in the trough, an oscillating agitator is installed, which makes pendulum movements in the gap between the drum and the trough. The introduction of the suspension is possible at any point in the trough and is carried out continuously to maintain a constant level. The drum is divided by radial partitions into a number of chambers isolated from each other. Each chamber is connected by a pipe to different cavities of the fixed part of the distribution head. The pipes are combined into a rotating part of the distribution head. Due to this, when the drum rotates, the chambers are connected in a certain sequence to sources of vacuum and compressed air. As a result, during a full rotation of the drum, each chamber passes through several zones in which various stages of the filter operation are carried out.

Known drum vacuum filter, disclosed in the source http://xn--l1amhh.xn--p1ai/uchebnik/TOO/800.php. (Lecture notes, Shchekotov Vladimir Anatolyevich, “Technological equipment of the industry, paragraph 3.2. Drum vacuum filters, their design and principle of operation). The known filter consists of a drum with filter cells, a bath into which the suspension enters, with a pendulum agitator for mixing the suspension, a distributing head, a sediment removal mechanism, a washing device, and drum and agitator drives from an electric motor, while the drum, partially immersed in the bath, is closed from the ends with flat covers and consists of two connected coaxial cylinders: internal solid and external perforated, covered on the outside with a filter cloth. The annular gap between the cylinders is divided by longitudinal partitions into filter cells. From the ends, flat covers and flange pins are reinforced by welding, with the help of which the drum is installed on the left in the plain bearing, and on the right - in the roller bearing, consisting of two lower and one upper rollers. Each cell is connected by a tube with output tubes.

A design variant of a drum vacuum filter (∅4000*7000 for washing cellulose) of the WARTSILA company is known. Known filter is a closed cylinder rotating on two supports, covered with perforated sheets, on which a filter cloth is placed. Through a collection tube system, the cellulose is deposited on the fabric with the help of vacuum and then removed. The inner sides of the end disks of the drum and the inner stiffening rings are made of carbon steels.

This solution was chosen as a prototype.

The disadvantage of the known solutions is the reduced reliability of the vacuum filter, since the carbon metal is exposed to an aggressive environment, as a result of which the drum may fail prematurely. In addition, the implementation of the drum in a closed design reduces the maintainability of the vacuum filter.

Disclosure of the essence of the utility model

The technical problem underlying the present utility model is to prevent the destruction of the end caps of the drum.

The technical result achieved in the implementation of the utility model is to increase the reliability and durability of the structure.

The utility model discloses a drum vacuum filter consisting of a tub and a drum, which is mounted on coaxial supports for rotation inside the tub. The cylindrical surface of the drum is made of perforated sheets with filter cloth. Unlike the prototype, radially arranged spokes are installed at the ends of the drum, to which pins are attached. As the material of the spokes, a material resistant to aggressive environments was used.

Additional advantages and essential features of the present utility model are presented in the following particular embodiments.

In particular, the drum bearings are represented by a drive and cell trunnion.

In particular, the cylindrical surface of the drum is provided internally with transverse stiffening ribs.

In particular, the spokes at the ends of the drum are made of stainless steel.

In particular, the transverse stiffeners are made of stainless steel.

The proposed drum vacuum filter differs in that it is made in an open design (open type). Stainless steel spokes are installed instead of end discs. This allows you not to save on the use of stainless steel, which has a positive effect on the reliability of the structure as a whole. The material of transverse stiffening ribs located inside the drum and stiffening rings has also been replaced with stainless steel. With this design, the drum is completely made of stainless steel, does not corrode and is accessible for repair and maintenance. The material of the trunnions has also been changed to increase the service life.

Brief description of the drawings

1 illustrates a vacuum filter drum.

Fig. 2 illustrates the appearance of the vacuum filter drum from the end.

Fig. 3 illustrates the appearance of the vacuum filter drum from the end.

The following symbols are used in the drawings:

1 - cylindrical perforated drum;

2 - cell trunnion;

3 - drive pin;

4 - perforated sheets with filter cloth;

5 - stiffeners;

6 - collector pipes;

7 - washing pipes;

8 - knitting needles.

Implementation of the utility model

In accordance with Fig.1, drum vacuum filter contains a cylindrical perforated drum 1, which is installed inside the tub (not shown) on the supports represented by cell 2 and drive pin 3. The cylindrical surface of the drum 1 is made of perforated sheets 4, on which the filter cloth is located. The inner side of the cylindrical surface is provided with transverse stiffeners 5 made of stainless steel. The drum 1 is divided by radial partitions (not shown in the drawing) into isolated chambers. Each chamber (not shown in the drawing) is connected to different cavities of the fixed part of the distribution head. The collector pipes 6 are combined into a rotating part of the distribution head of the cell trunnion 2. When the drum 1 rotates, the chambers are connected in a certain sequence to the sources of vacuum and compressed air. As a result, during a full rotation of the drum, each chamber passes through several zones in which various stages of filtration are carried out. Washing pipes 7, located inside the end part of the drum 1, are designed to supply washing liquid when the sediment enters the washing zone.

The drum is immersed in the suspension by 30-40% of its volume, with which the bath is filled. The cross section of the bath is made semicircular, repeating the shape of the drum. The bath is connected with supply pipes through which the suspension is supplied.

In accordance with Fig.2, the end of the cylindrical perforated drum 1 is represented by radially arranged spokes 8, to which the drive pin 3 is attached, while the spokes are made of a material resistant to aggressive environments, in particular, stainless steel.

In accordance with Fig.3, the end of the cylindrical perforated drum 1 is represented by radially arranged spokes 8, to which the cell pin 2 is attached, while the spokes are made of a material resistant to aggressive environments, in particular, stainless steel. The collector pipes 6 are combined into the rotating part of the distribution head of the cell trunnion 2.

Drum vacuum filter works as follows.

Suspension is fed into the bath through the supply pipeline. The bath is filled to the required level, maintained throughout the process. When the drum 1 rotates, the chambers are connected in a certain sequence to sources of vacuum and compressed air. As a result, during a full rotation of the drum, each chamber passes through several zones in which various stages of filtration are carried out. The filtration process takes place in the chamber as long as it is immersed in the suspension. The filtrate is discharged through the collector pipes 6 connected through the distribution head to the vacuum line. The filtering partition can be a filter belt stretched over the drum. By means of barometric tubes, a vacuum is created under the filter cloth, due to which the pulp is deposited. As the chamber stays in suspension, a layer of sediment, represented by pulp, grows on the surface of the drum 1. When the chamber rises above the slurry surface, sediment filling stops. Next, the sediment layer enters the washing zone. Washing pipes 7, located inside the end part of the drum 1, are designed to supply washing liquid when the sediment enters the washing zone. The wash filtrate is discharged through another section of the head. After washing, the sludge is dried and then the sludge is removed from the drum with a knife and facilitated by blowing.

Claims (5)

1. Drum vacuum filter, consisting of a bath and a drum, which is mounted on coaxial supports with the possibility of rotation inside the bath, and the cylindrical surface of the drum is made of perforated sheets with filter cloth, characterized in that radially located knitting needles are installed at the ends of the drum, to which trunnions are attached, while the material used for the spokes is resistant to aggressive environments. 2. Drum vacuum filter according to claim 1, characterized in that the drum supports are represented by a drive and cell trunnion. 3. Drum vacuum filter according to claim 1, characterized in that the cylindrical surface of the drum is provided inside with transverse stiffeners. 4. Drum vacuum filter according to claim 1, characterized in that the spokes at the ends of the drum are made of stainless steel. 5. Drum vacuum filter according to claim 3, characterized in that the transverse stiffeners are made of stainless steel.

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