JPS6156006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for taking a part of running water such as discharged water from a sewage wastewater treatment plant and using it as defoaming water, water for withdrawal, etc. while further removing impurities. The present invention relates to a water intake device having an internal drum screen.

Conventionally, a water intake device with an internal filter drum screen has two types:
(b) Some systems have a structure in which the entire amount of discharged water is received and filtered out, and then the required amount is diverted through branch pipes.

However, in the case of conventional water intake devices, the above (a) and (b)
No matter what type of material it is, it is essential that the entire amount is passed through, and therefore, the drum screen is closed at both ends, so the screen surface will be clogged with foreign matter that accumulates inside. This may cause problems such as a decrease in processing capacity, inability to process, and even damage to the equipment.

For this reason, a device for collecting impurities inside the drum screen and discharging it to the outside is required, and a raw water supply device must also be provided, making the entire device large-scale and complicated in structure.

In order to eliminate the above-mentioned fears and difficulties, the present invention provides a system in which a water intake tank and a rotating drum screen that completely covers the water intake port are submerged under the surface of raw water, and a water intake pipe is led out from the water intake tank. By separating running water such as effluent (raw water) and service water (over-treated water) using the screen surface as a boundary, by opening both ends of the rotating drum screen, impurities inside the drum screen can be removed from the natural flow of the flowing water. It is characterized by being discharged or diffused outside the drum screen by the flow.

Hereinafter, the present invention will be explained in detail based on the drawings. 1 and 2 show an example of a water intake device according to the present invention, in which the upper surface of a box-shaped water intake tank 2 submerged under the surface of flowing water, that is, raw water 1, is opened as a water intake port 3. 3 is completely covered by the lower part of the screen surface 5 of the drum screen 4 and partitions the raw water 1 and the overtreated water 6.

The drum screen 4 has a screen surface 5 with both ends open and the circumferential side covered with a punching plate, and is arranged with its axial direction parallel to the water flow, and supported rotatably around its axis by a pair of left and right support devices 7, 7. It is rotated at a slow speed by a drive means 8 consisting of a motor.

The drum screen 4 has a part or most of it submerged under the water surface, and a part of the raw water 1 passing through the drum screen 4 is sucked into the water tank and passed therethrough, but at this time, clogging due to foreign matter is prevented. Therefore, a backwashing header 9 and a rubber scraper 10 are arranged above the header, and the backwashing water causes foreign matters adhering to the screen surface 5 to fall, and the flowing water discharges them from the lower end. In the figure, 21 is a water intake pipe connected to the right end wall 22 of the water intake tank 2, and 11 is a sealing member for sealing the gap between the drum screen 4 and the water intake port 3. Conventionally, a band-shaped rubber plate is used for this sealing member, but if cuts 12 are made in this rubber plate at appropriate intervals as shown in Fig. 3, contact with the screen surface 5 at each part can be improved. Since the pressure is reduced, there is less wear and tear, and if there are irregularities on the screen surface 5, only the relevant part is deformed and other parts are not affected, so that the raw water 1 and the over-treated water 6 are well isolated. This results in benefits such as being carried out on a regular basis.

As shown in FIG. 2, the support device 7 includes an end frame 41 at both ends of the drum screen 4, a pivot shaft 43 concentrically connected to the end frame 41 via a cross frame 42, and a pivot shaft 43 that supports the pivot shaft 43. Bearing 44 that supports rotation
and a fixed frame 45 that supports the bearing 44. This fixed frame 45 is suspended from the drainage open channel 14 by the suspension frame 13, while also attaching and fixing the water intake tank 2.

Each end frame 41 is formed into an annular ring having a substantially L-shaped cross-sectional shape as shown in FIG. .

Further, between the end frames, intermediate frames 46 are fixed according to the length of the screen surface, and in order to prevent the screen surface 5 from deforming, a plurality of reinforcing frames 47 running straight from side to side are installed. It is connected to the end frame 41 and the intermediate frame 46 (FIGS. 1 and 5).

The method of supporting the drum screen 4 is as shown in FIG.
48, and the rails 48, 48 are arranged in pairs in the front and back direction of the drum screen 4 (two in the figure).
It is supported by a pair of support rollers 15, and a pivot shaft 43 is driven by a motor. Further, as shown in FIG. 6, this support roller 15 is formed to have approximately the same length as the water intake tank 2, and its outer periphery is made into a spongy shape. The sealing member 1 of the previous example is brought into contact with the peripheral wall 23.
It is also possible to have them take on some of the roles of 1.

Next, the drum screen 4 and the water intake tank 2 are
Another embodiment will be described in which the length can be freely increased or decreased and the processing capacity can be freely adjusted before and after installation. [FIGS. 7 to 10] In this case, the drum screen 4 connects end flanges 51 and 51 as shown in FIG. 9 to both ends of a basket train in which a plurality of baskets 50 shown in FIG. 8 are coaxially connected. It is composed of

The basket 50 is a cylindrical body of a certain length with annular basket flanges 52, 52 at both ends and a screen surface 5 on the circumferential side.
52 are connected.

Further, a cross frame 42 is fixed to the end flange 51, and a support shaft 53 is attached to the intersection thereof. To connect the baskets 50 to each other and to connect the baskets 50 and the end flanges 51, for example, as shown in the figure, in addition to bolts and nuts, connection means such as welding and rivets are used. However, in order to add or remove baskets, bolts and nuts are used. Connection by nuts is preferred. In addition, it is preferable to use packing material such as a gasket for each connection part.

On the other hand, the water intake tank 2 is formed by connecting the same number of troughs 20... having the same length and cross-sectional shape as the basket 50 to form a trough train, and covering both ends of the trough train with left and right end walls 24, 22. It is. Each trough 20... has the upper side of the peripheral wall 23 opened almost entirely, and has outer flange-like connecting parts 20a on both end edges thereof, and a flange part 25 that fixes the rubber plate-like seal member 11 to the upper end of the peripheral wall. will be established. The flange portion 25 is also provided at the upper end portions of both the left and right end walls 24, 22. The connections between the troughs and between the troughs and the end walls are carried out in the same manner as in the case of the drum screen.

In this embodiment (FIGS. 7 to 10), the drum screen is a support shaft 5 attached to an end flange 51.
3 is supported by a support device 7, but a pivot shaft 43 extending from left to right may be used as in the above embodiment (FIGS. 1 to 6). In that case, the pivot shaft 43
It is necessary to construct the drum screen so that it can be added depending on the number of baskets 50, or to replace it depending on the length of the drum screen 4. Further, support may be provided using rails and support rollers. In addition, the seal member 11
For use in the front and rear directions, a belt-shaped rubber plate of the same length as the basket 50 with cuts made at appropriate intervals may be used.

In addition, in each of the above embodiments, the screen surface 5
Although a punched plate was used, the structure is not limited to this, and it may be constructed by arranging a large number of bars to form a slit screen shape or using a wire mesh. Regarding the positional relationship between the drum screen 4 and the water intake tank 2, they may be arranged side by side.

Furthermore, the idea of the above embodiments [Figs. 7 to 10], that is, forming a drum screen by connecting a plurality of baskets coaxially, is not limited to the case of an internal drum screen with both ends open. It can also be applied to internal or external drum screens that are closed at one or both ends. In that case, as in the case of this embodiment, the water intake tank, outer wall, outer cylinder, etc. may also be connected to each other so as to be freely increased or decreased.

As explained above, the present invention allows at least a portion of the inner peripheral surface of the drum screen to be submerged under the surface of raw water so that the inner surface of the screen is washed by the flow of raw water and the drum screen is rotated. This makes it possible for debris to fall and spread outside the drum, making it difficult for debris to accumulate inside the drum screen, making it possible to avoid long-term interruptions in water intake due to screen clogging. Not only can this be prevented, but the raw water can pass through both ends of the drum screen and the screen with almost no resistance, and the raw water cannot be discharged due to clogging of the screen.

Further, since a device for discharging impurities is not required, the structure is simple and can be obtained at low cost.

Furthermore, since raw water and service water are separated by the screen, there is no need to provide branch pipes on the upper or lower side of the drum screen in the water flow direction, which further simplifies the structure.

In addition, since the drum screen is formed small relative to the cross-sectional area of the flow path on the upstream side of the drum screen in the water flow direction of the raw water, the installation volume can be small.

Furthermore, when the present invention is carried out in such a manner that the axial direction of the drum screen and the water flow direction of the raw water are almost the same, in addition to the above effects, since the screen surface does not cross the flow of raw water, the screen due to the flow of raw water can be This has the advantage that purification can be carried out more effectively.

Furthermore, when the drum screen is formed from multiple baskets and the water intake tank is also formed from multiple troughs and two end plates, in addition to the above effects, the drum screen and water intake tank can be modularized as standard products. In the past, baskets, troughs, and end walls were produced in large quantities with a small number of types, and in the required number according to processing capacity. Since only one part needs to be connected, it is possible to significantly reduce costs due to mass production, and if a part of the parts is damaged, only that part needs to be replaced, so maintenance and repair costs can be reduced. Furthermore, even if the required processing capacity increases or decreases due to changes in circumstances after installation, the number of parts can be increased or decreased as appropriate, which is cheaper than installing separate units or replacing old and new machines. As a result, the depreciation period can be estimated to be longer, so the value as an asset becomes substantially higher, and it has various excellent advantages.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of a water intake device according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a perspective view of a sealing member, and Fig. 4 is an enlarged longitudinal sectional front view of a portion of Fig. 1. , FIG. 5 is an enlarged cross-sectional front view of FIG. 1, FIG. 6 is a side view of another embodiment, FIGS. 7 to 10 show still other embodiments, and FIG.
The figure is a partially sectional front view, FIG. 8a is a front view of the basket, b is a sectional view taken along the line ``a'' in the same figure, FIG. 9a is a front view of the end flange, and b is a front view of the basket ``a'' in the same figure.
The line sectional view and FIG. 10 are exploded perspective views of the water intake tank. 1...raw water, 2...water intake tank, 20...trough,
21... Water intake pipe, 3... Water intake, 4... Drum screen, 41... End frame, 5... Screen surface,
50... Basket, 51... End flange, 6
...Overtreated water, 7... Support device, 8... Drive device, 11... Seal member.

Claims (1)

[Claims] 1. At least a part of the water intake port 3 of the water intake tank 2 is submerged under the surface of the flowing water 1, and the water intake port 3 is completely covered with a part of the screen surface 5 of the drum screen 4. The drum screen 4 is rotatably supported around its axis by a support device, rotatably driven by a drive means 8, and has an internal drum screen formed by leading out a water intake pipe 21 from the water intake tank. Water intake device. 2. The drum screen 4 has a cylindrical shape with a screen surface 5 on the circumferential side and open ends at both ends, and at least a part of the screen surface 5 is submerged under the water surface, with its axial direction substantially aligned with the water flow direction. 2. A water intake device according to claim 1, wherein the water intake device is arranged as follows. 3. The water intake device according to claim 1 or 2, wherein the drum screen 4 and the water intake tank 2 are each constructed by connecting a plurality of members having the same shape in a manner that can be increased or decreased. 4. The drum screen 4 is provided with annular basket flanges 52, 52 at both ends, and a plurality of baskets 50 of a certain length with the screen surface 5 on the peripheral side are coaxially connected to form a basket train, and the basket train A support shaft 53 is provided at both ends of the
The water intake tank 2 is constructed by connecting end flanges 51, 51 to which the above-mentioned baskets 50...
The same number of troughs 20... in cross-sectional view are sequentially connected by connecting portions 20a, 20a at both ends of the troughs to form a trough train, and each end wall 2 is attached to both ends of the trough train.
3. The water intake device according to claim 3, which is constructed by connecting 2 and 24.