(19)
(11)EP 2 810 701 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
10.12.2014 Bulletin 2014/50

(21)Application number: 14169431.5

(22)Date of filing:  22.05.2014
(51)International Patent Classification (IPC): 
B01D 33/21(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30)Priority: 04.06.2013 CZ 20130418

(71)Applicant: IN - EKO Team s.r.o.
62100 Brno (CZ)

(72)Inventor:
  • Strnad, Josef
    62100 Brno (CZ)

(74)Representative: Musil, Dobroslav 
Cejl 38
602 00 Brno
602 00 Brno (CZ)

  


(54)Filtration discs with a rotatably mounted central tube


(57) The invention relates to a rotatable mounting of the central tube (1) of a disc filter, which is rotatably mounted in the structure of the disc filter, being coupled with a drive and having at least one row of filtration elements, arranged on it radially along the circumference, whereby these filtration elements constitute a filtration disc (5), embracing the circumference of the central tube (1). The central tube (1) is at both ends hung on an endless drive belt (2), whereby each of the drive belts (2) is wrapped around at least one pulley (3) above the level of the maximum height level of the fluid being filtered in the filter, and the driving pulleys (3) are rotatably mounted in the structure of the filter, at least one of them being coupled with a drive.




Description

Technical field



[0001] The invention relates to a rotatable mounting of the central tube of a disc filter, the central tube being rotatably mounted in the structure of the disc filter, whereby it is coupled with a drive and at least one row of filtration elements is radially mounted along circumference of the tube, the filtration elements constituting a filtration disc embracing the circumference of the central tube.

Background art



[0002] Disc filters are advantageous especially because of a favourable relationship between the size of the filtration area and the built-up dimensions. Disc filters, hereinafter referred to as "disc filters", are generally known, for example, from EP 1 596 958, WO 2009/011862 and others.

[0003] The principle of disc filters consists in that the fluid to be filtered flows into the inner space of a central tube, for example waste water, which flows into the inner space of the filtration elements through openings in a cylindrical body of the central tube, the filtration elements being located in a radial direction along the circumference of the central tube and constituting a "filtration disc" or a row of filtration discs. The filtration elements are provided with filtration surfaces through which the fluid being filtered flows to be further use after exiting the filter. Impurities captured by the filtration surfaces are by means of permanent or periodic rotation of the central tube about its longitudinal axis carried up above the level of the fluid being filtered in the central tube and are moving either spontaneously, or are transferred, with the aid of spraying, to a discharge channel of solid impurities

[0004] The central tube of the disc filter is in the known examples of embodiment rotatably mounted in roller or friction bearings, which are due to the structure of the known filters arranged below the level of the fluid being filtered and so they are exposed to the negative effects of water as such, and, in addition, can also be fouled by impurities etc., which increases probability that a failure occurs and also frequency of occurrence of a defect or a failure. Another disadvantage is that the existing bearings for a rotatable mounting of the central tube are arranged in the axis of the central tube rotation, where they are fixedly attached by means of a system of radial spoke, which, on the one hand, limit the flow of the fluid being filtered to the central tube and, on the other hand, cause impurities, such as hair etc., to be captured on individual spoke, which particularly affects and limits the flow of the filtered fluid to the central tube. Although it is possible to reduce unfavourable working conditions by sealing devices and lubrication, this is associated with environmental hazards, such as the risk of lubricant leakage into water, etc. Furthermore, the sealing devices of the bearings are fault-prone. In the event of a failure of the mounting of the central tube, the filter is inactive with all the negative effects of this state and, moreover, repairing the existing embodiments of the mounting is demanding and expensive.

[0005] The aim of the invention is to eliminate or at least to reduce the disadvantages of the background art, especially to improve the durability of rotatable mounting of the central tube of a disc filter while maintaining its full functionality and capacity.

Principle of the invention



[0006] The goal of the invention is achieved by a rotatable mounting of the central tube of a disc filter whose principle consists in that the central tube is at both ends hung on an endless drive belt, whereby each of the drive belts is wrapped around at least one pulley above the level of the maximum height of the level of the fluid being filtered in the filter and the drive pulleys are rotatably mounted in the filter structure and at least one of them is coupled with a drive.

[0007] This solution provides a reliable rotatable mounting of the central tube of a disc filter without the filtered fluid influencing negatively the components of the mounting, since there is no rolling drag or friction between the central tube and the drive belt, and therefore there is minimal wear and also possible deposits of impurities on the surface of the tube as well as on the belts do not pose any major problems.

Description of drawings



[0008] The invention is schematically shown in the drawings, where Fig. shows a view of a lateral side of an example of embodiment of arrangement of mounting of the central tube of a disc filter according to the invention, Fig. 2 represents a view of the front side of an example of embodiment of an arrangement of a mounting of the central tube of a disc filter according to the invention, Fig. 3 shows a top view of an example of embodiment of an arrangement of a mounting of the central tube of a disc filter according to the invention, Fig. 4 shows a variation of a mounting of the central tube of a disc filter and Fig. 5 represents another variation of a mounting of the central tube with an eccentrically mounted pulley and the position of the central tube being secured by a pressure roller.

Examples of embodiment



[0009] The invention will be described using an example of embodiment of a rotatable mounting of the central tube of a disc filter.

[0010] The central tube 1 of a disc filter is rotatably mounted in the structure of the filter, such as in the frame in a concrete channel or in the body of a bathtub in which the filter has been installed. The central tube 1 is at both ends wrapped along its outer circumference by an endless drive belt 2, which is further wrapped around at least one pulley 3. In the illustrated embodiment the central tube 1 is wrapped by both endless drive belts 2 directly on the outer surface of its cylindrical body. In an unillustrated example of embodiment at least at one end of the central tube 1 on the outer surface of the cylindrical body of the central tube 1 is formed as a guiding surface, which is, if needed, provided also with guiding rims or is formed as a groove for guiding endless drive belts 2. In another unillustrated example of embodiment one end of the central tube 1 is wrapped on its outer surface directly by the endless drive belt 2, whereby at the other end of the central tube 1 a guiding surface, wrapped by the other endless drive belt 2, is formed.

[0011] The pulleys 3 are mounted in the structure of the filter rotatably about an axis which is parallel with the axis O of rotation of the central tube 1 and are located at a level above the maximum height of the level of the fluid being filtered in the filter, preferably above the upper outline of the central tube 1, as is shown in the figures. At least one of the pulleys 3 is coupled with an unillustrated drive, such as an electric motor, through an unillustrated gear box, etc. Preferably, the pulleys 3 are mounted in the structure of the filter mutually independently, i.e. each of the pulleys 3 is mounted in the structure of the filter separately and independently of the other pulleys 3. The pulleys 3 have the so called "embossed" guiding surface of the endless drive belts 2, which ensures the side position stability of the endless drive belts 2 on the pulleys 3. Also the pulleys 3 can be in case of need or for the purpose of increasing the safety of guiding the endless drive belts 2 provided with guiding rims which transform the guiding surfaces of the pulleys 3 into guiding grooves.

[0012] In the example of embodiment shown in Fig. 1 to 3, each of the endless drive belts 2 is wrapped around two pulleys 3, only one of these four pulleys 3 being coupled with a drive.

[0013] In the example of embodiment shown in Fig. 4, each of the endless drive belts 2 is wrapped only around one pulley 3 and only one of these two pulleys 3 is coupled with a drive, whereby restrictors 10 of the movement of the central tube 1 are aligned on both sides with the central tube 1.

[0014] Fig. 1 to 4 do not represent a filter disc, the filter disc is shown only in Fig. 5.

[0015] In the example of embodiment shown in Fig. 5, each of the endless drive belts 2 is wrapped around one pulley 3, which is rotatably mounted above the central tube 1 eccentrically in relation to the central tube 1. The position of the central tube 1 is secured by a pressure roll 30, which is rotatably mounted in the structure of the filter, whereby, from the side, it keeps the central tube 1 in a required position before the central tube 1 shifts spontaneously directly downwards below the pulley 3. Preferably, in this example of embodiment at least one of the pulleys 3 is coupled with a drive. Also, in this example of embodiment, the outer outline of the filter disc 5 is indicated, which shows that the pulleys 3 can be mounted in the structure of the filter either mutually independently or they can be rotatably mounted on a common rotatable shaft or on a common rotatable tube or they can be rotatably mounted on a common rigid tube or bar etc.

[0016] Apparently, using two and more pulleys 3 for mounting each of the belts 2 provides better stability of the central tube 1 and, last but not least, it is also more favourable with respect to distribution of the load of the bearings of the pulleys 3 amongst more elements.

[0017] If necessary, so as to retain the axial forces, such as those from the filtered fluid flowing into the central tube 1 in a direction of the arrow X in Fig. 2 and 3, the central tube 1 is aligned with a suitable technical element, e.g. an axial bearing 4. This technical element does not necessarily have to be located in the axis O of rotation of the central tube 1.


Claims

1. A rotatable mounting of the central tube (1) of a disc filter, which is rotatably mounted in the structure of the disc filter, being coupled with a drive and having at least one row of filtration elements, arranged on it radially along the circumference, whereby these filtration elements constitute a filtration disc (5) embracing the circumference of the central tube (1), characterized by that the central tube (1) is at both ends hung on an endless drive belt (2), wherein each of the drive belts (2) is wrapped around at least one pulley (3) above the level of the maximum height of the fluid being filtered, and the driving pulleys (3) are rotatably mounted in the structure of the filter, at least one of them being coupled with a drive.
 
2. A rotatable mounting of the central tube of a disc filter according to Claim 1, characterized by that the central tube (1) is wrapped by both endless drive belts (2) directly on the outer surface of its cylindrical body.
 
3. A rotatable mounting of the central tube of a disc filter according to Claim1, characterized by that the central tube (1) is provided on the outer surface of its cylindrical body with a guiding surface for guiding the endless drive belts (2).
 
4. A rotatable mounting of the central tube of a disc filter according to any of Claims 1 to 3, characterized by that the pulleys (3) are rotatably mounted about an axis parallel with the axis (O) of rotation of the central tube (1) and are located at a level above the maximum height of the level of the fluid being filtered in the filter.
 
5. A rotatable mounting of the central tube of a disc filter according to any of Claims 1 to 4, characterized by that, the pulleys (3) are mounted in the structure of the filter mutually independently.
 
6. A rotatable mounting of the central tube of a disc filter according to any of Claims 1 to 5, characterized by that each of the endless drive belts (2) is wrapped around two pulleys (3), only one of these four pulleys (3) being coupled with a drive.
 




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Search report




Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description