UA49774C2 - device in disk filter - Google Patents

Abstract

The sector element of disk filter contains a sector part with flat opposite sides, edges and end, which connect the sides of triangular shape with many holes, and throat part, which connects with the frame part of the filter.

Description

solution 9 located in the trough 2. Through the frame part 4, a reduced pressure is created inside the sector element 5, immersed in the solution 9. As a result, part of the liquid can pass through the filter cloth 8 shown in Fig. 3, and then through the holes 7 in the side surface 6 to get into the sector element 5. Under the action of reduced pressure, the liquid flows from the inner part of the sector element 5 into the frame part 4 and flows out of the disc filter 1 while the solid matter remains on the surface of the filter cloth 8, from where it is removed by means of a squeegee 10 or something similar into the receiving chute 11 before the next cycle of filtration. An excess pressure can be created inside the sector element 5 to further facilitate the removal of solid matter.

The disk filter 1 shown in Fig. 1 contains 12 sector elements 5 and the edges 12 of each sector element 5 essentially form an angle of 30". Thus, the side surface of the sector element 5 in the disk filter 1 of a certain radius K has a limited maximum area Az.

As shown in Figures 2 and 3, the sector element 5 has a neck part 14 connecting the sector part with the frame part 4. Figures 2 and 3 show the boundary of the section 21, where the angle between the edges of the sector element 5 changes. This boundary of the section 21 defines the sector part 15, located in the upper part of the sector element 5, and the neck part 14, located near the frame part 4. At the bottom of the neck part 14, that is, on the side of the frame part 4, there is a section of the outlet opening 20, which can be tightly seated in a hole or in some other connecting means made in the frame part 4. In addition, a flow channel 16 is provided through the neck part 14 and the area of the outlet opening 20, so that the liquid phase that has passed into the sector part 15 can flow out through this channel into the frame part 4 and receive for further processing.

The cross-section of the flow channel 16 can be round, oval, rectangular or polygonal.

However, from the point of view of rheological properties, a round cross-section is the most advantageous shape.

Fig. 4 schematically illustrates a sector element 5' from the prior art. The side surface 6 of the sector part 15 has an area Ah, and the flow channel 16 at the outlet 20' has an internal cross-sectional area Ak. In addition, the sector element 5' has a height Г" from the top of the sector part 15 to the bottom of the neck part 14. Fig. 5 schematically illustrates the sector element 5 according to the invention. Comparison of the sector elements 5 and 5, shown in Fig. 4 and 5, respectively , shows that in the sector element 5 according to the invention, the height of the throat part 14 can be smaller than before. The size О of the frame part 4 can be increased in this way without the need to also increase the radius K of the disk filter 1. With a larger than before diameter Ю frame part 4, it is possible to equip the frame part with larger flow channels, which will improve the transfer of the filtered liquid phase further to processing. The sector part 15 can fit closer to the frame part 4, therefore, despite the larger diameter O of the frame part 4, the area Ah of the side surface 6, which participates in the filtration, may essentially be equal to the corresponding area in the prior art disk filter with the same radius K. In addition, the frame part 4 with a large diameter Ω m will be equipped with sector elements 5, in which the flow channel 16 is larger than before. In the device according to the invention, the liquid phase passing through the sector part 15 can flow more effectively into the frame part 4 for at least the following reasons. Firstly, the cross-sectional area of the flow channel 16 in the neck part 14 is quite large relative to the filtration area Az of the side surface 6, which causes lower hydraulic resistance and better flow speed in the flow channel 16. On the other hand, the length of the I. sector element 5 is smaller, than before, so the flow path to frame part 4 is shorter. In addition, due to the short neck part 14, the flow channel 16 is also shorter than before, which further reduces the hydraulic resistance of the neck part 14.

The sector part 15 and the neck part 14 can be a single part, or can be separate components that are fastened together during the manufacture of the sector element 5. Fig. b6 shows another alternative design, where the sector element 5 consists of components that can be joined together and separated. The neck part 14 and the sector part 15 can be placed one inside the other in a certain position, as shown in Fig.b and 7, so that the protrusions 19 or any other similar fastening means, with which the sector part 15 is equipped, enter the recesses or other suitable structural elements in the neck part 14. Another alternative method of connecting the parts is, for example, the use of an adhesive that melts at an elevated temperature. The advantage of this design is that the neck part 14 can be a replaceable element that can be replaced quickly and easily if the flow channel 16 has failed during use. As a general rule, the sector part 15 is not subjected to such intense wear and load as the neck part 14, so it has a significantly greater durability than the neck part 14. On the other hand, the separate neck part 14 can be made of a highly wear-resistant material. In addition, the wear resistance of the flow channel 16 in the neck part 14 can be increased, for example, by increasing the thickness of the channel wall in critical places.

As shown in Fig. b and 7, the bottom of the sector part 15 is equipped with a recess 17. The recess 17 can be located in a place subject to strong wear by the flowing stream. Accordingly, the neck portion 14 has a protruding section 18 with a greater wall thickness. The dotted line indicates the protruding area 18 in Fig.7. Thus, a wear section of the flow channel 16 is formed in the replacement neck portion 14 to protect the sector portion 15, which is much more expensive to manufacture, from wear and to ensure a long life of the sector portion 15.

The drawings and corresponding description are intended only to illustrate the inventive idea. The details of the invention may vary within the scope of the claims.

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