JPH06123110A - Dust removing device - Google Patents

Abstract

PURPOSE:To prevent the damage of apparatus for improving their maintenance ability by securing a passage for flowing water going through a louver to an outlet, and reducing the flow out of dust toward downstream even if an obstruction to passing water results from the sudden increase in the dust. CONSTITUTION:In the case of ordinary operation, a small quantity of water flows into a louver 48 having large flowing water resistance, and flowing water passes through mainly an opening 45 as it is. Dust included in the flowing water is caught by a net type screen 51, and an upper sprocket is turned over and removed from a channel. On the other hand, the flowing in of the dust increases suddenly, and the dust covers about the whole surface of the net type screen 51 to suddenly increase the head difference. The passing water resistance increases then to increase the quantity of flowing water into the louver 48 for reducing an obstruction to passing water. In addition, the dust flowing into the crooked louver 48 is checked in its passage at the inlet of the louver 48 to reduce its flowing out toward downstream.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust remover for removing dust from seawater or river water, and more particularly to a dust remover for preventing an abnormal water level difference before and after the dust remover caused by a large amount of dust temporarily flowing in. .

[0002]

2. Description of the Related Art Conventionally, generally used dust removers have been widely used in industrial water canals or water canals for collecting cooling water in power plants, and the most well-known ones are water canals. A link chain is provided on both sides, and a bar screen or a screen made of wire mesh is erected vertically or almost perpendicularly to the flow direction for each link of this link chain, and the dust caught on the screen is rotated by rotating it. There is a structure to remove it outside the waterway.

3 to 5 show a conventional dust removing device, and FIG.
Is an overall schematic view, FIG. 4 is a vertical sectional view of the screen frame, and FIG. 5 is a front view of the screen frame.

In FIG. 3, 1 is an upper sprocket wheel, 2 is a lower sprocket wheel, 3 is a link chain mounted endlessly on both sprocket wheels 1 and 2, and 4 is a link chain mounted on a link chain 3 and captured by the lower part. A screen frame having a bucket portion for accommodating dust is a power unit for transmitting power to the upper sprocket wheel 1 via a transmission chain 6 and a chain wheel 7, 8 is a shaft of the upper sprocket wheel 1, and 9 is a trough 10 for dust. Is a guide plate for guiding the housing, 11 is a housing of the dust removing device, 12 is a flowing water channel, and F arrow is a direction of flowing water.

As shown in FIG. 4, the screen frame 4 is attached at every pitch of the link chain 3, and 14 is a screen main body, which is composed of many rods arranged in the shape of a wire net or a plow, and is a dust in running water. It is a member that scoops up this as well as prevents it.

Reference numeral 15 is an upper beam provided on the upper end of the screen body 14, and the upper beam 15 is a pipe having a diameter suitable for the width of the water channel, and the center of which is the roller 3b of the link chain 3. The screen body 14 is integrally fixed via a mounting plate 16 provided so as to be located at the center of the screen and projecting from the lower part thereof.
Reference numeral 17 denotes a lower beam having a U-shaped cross section provided at the lower end of the screen body 14, and the lower beam 17 rotatably covers the upper portion of the upper beam 15 of the screen frame 4 adjacent to the lower portion thereof. The screen body 14 is integrally fixed via a mounting plate 18 provided on the upper part of the screen.

Reference numeral 19 denotes a side plate for holding the screen body 14 from its side portion. The side plate 19 has a width wider than the link width of the link chain 3 as shown in FIG. It is fixed integrally to each end face. In other words, the side plate 19, the upper beam 15 and the lower beam 17 form a frame body (screen frame 4) for holding the screen body 14. The frame body is fixed to the link chain 3 by fixing the side plate 19 to the side surface of the link 3a with the bolt 20. Reference numeral 21 denotes a dust bucket projecting from the lower beam 17, and the dust bucket 21 is provided so as to obliquely cover the lower front part of the screen body 14, and the left and right ends of the dust bucket 21 are provided with side plates 19 via a support plate 22. Is integrally fixed to. Reference numeral 23 is a spray pipe provided on the back of the descending screen 13 for ejecting spray water to the back surface of the screen 13 as shown by a chain line so as to remove the dust attached to the screen body 14. Is. Therefore, dust and the like floating in the flow are first blocked by the screen body 14, and are scooped up by the dust bucket 21 as the link chain 3 rises, and the dust bucket 21 containing the dust further rises, and the upper sprocket 1 It becomes horizontal at the top of, then flips and descends.

The dust existing in the dust bucket 21 falls due to its gravity, and is guided by the outer surface of the dust bucket 21 of the lower screen and the guide plate 9 to form the water channel 10.
Is discharged inside. On the other hand, dust and the like adhering to the screen body 14 is separated by the spray water and discharged to the trough 10 via the outer surface of the dust bucket 21 of the lower screen and the guide plate 9 as described above.

The endless link chain 3 to which the screen frame 4 constructed as described above is joined is usually driven by the upper sprocket wheel 1 having about 6 teeth. In addition,
The L arrow indicates the link chain driving direction.

[0010]

In recent years, as the amount of water intake increases, the width of the water channel becomes wider, while the dust particles floating in the water channel tend to increase, and the inflow dust particles also frequently increase rapidly. In particular, when a large amount of dust such as mica that is generated in the summer is temporarily concentrated and flows in, the screen surface is almost completely covered and running water cannot pass through. The water level difference exceeds 1500 mm, and in extreme cases it may reach 2000 mm,
Therefore, a large force is applied to the screen frame and the link chain, which shortens the life of the link chain and causes a serious accident such as breakage of the link chain, resulting in suspension of operation.

[0011]

In order to solve the above-mentioned problems, in the dust remover of the present invention, an endless link chain is joined to a screen frame provided with a net-type screen for collecting dust, In a dust remover that drives the link chain through a pair of upper and lower sprocket wheels, an opening is provided in an upper portion and / or an intermediate portion of a screen frame, and a louver composed of a plurality of oblique parallel flat plates is provided on the front side of the opening. It forms a passage for running water.

[0012]

In the dust removing device of the present invention, the dust is coated on the entire surface of the mesh type screen due to the rapid increase of the dust, and therefore even if the flow of the running water is obstructed, the dust removing device is provided at the upper portion or the middle portion of the screen frame. Since the flowing water can pass through the louver through the opening, it is possible to keep the water level difference before and after the dust removing device low. Further, even if dust particles accompany the flowing water passing through this opening, the passage of dust particles can be blocked by the louver, so there is almost no loss of dust particles downstream.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment according to the present invention, FIG. 1 is a vertical sectional view of a screen frame, and FIG. 2 is a rear front view of the screen frame. In the figure, the screen frame 4
The upper frame 41, the lower frame 42, and the intermediate frame 44 are formed by a pair of left and right side plates 43, 43 that are vertical to the horizontal members of the upper frame 41, the lower frame 42, and the intermediate frame 44.
4a. Further, right below the upper frame 41 and the intermediate frame 44, horizontally long openings 48a, 48a are provided. On the front side of the opening (outlet 48a, outlet 48a), the flowing water flowing through the outlet once flows from upstream to downstream of the water channel, and then reverses the direction of flow from downstream to upstream. Then, horizontal plates having substantially the same width and length are diagonally shifted and arranged in parallel so as to form a detour that flows from upstream to downstream again. The louver 48 composed of these oblique parallel flat plates and the vertical plate are called a passage 60 of flowing water. In the device having the intermediate frame 44 as in this embodiment, the passage 60 is provided in the lower part of the upper frame 41, and
It is desirable to provide the outlet 48a and the passage 60 also directly below the intermediate frame 44. The screen frame 40 configured as described above may be adopted as the total number of screen frames of one dust removing device, but normally, the screen frames 40 are arranged at equal intervals in about 20% of the total number, and the other 80% of the screen frames are Opening (exit 48a) and maze 48
The conventional type shown in FIGS.

The operation of the screen frame 40 of the dust removing apparatus of the present invention constructed as described above will be explained. In normal operating conditions, that is, in an operation in which there is not much water level difference before and after the apparatus, running water will not flow. Mainly, as in the case of the flow A in FIG. 1, the louver 48 having a large resistance to the flowing water (the flow B has a larger resistance than the flow A because the flowing water reversely bends) passes through the opening 45 without much flowing water. Then, the dust contained in the running water is collected by the net-type screen 51, and after the upper sprocket is turned over, it is removed from the water channel. On the other hand, the inflow of dust rapidly increases, and the net-type screen 51
When almost all of the surface is covered with dust, and thus the difference in water level sharply increases and the water flow resistance increases, the flow water of the flow B to the louver 48 increases and the water flow obstacle is reduced. Further, since the louver 48 is bent, the dust that flows into the louver 48 will not be removed by the louver 4.
The passage at the entrance of 8 is blocked, so there is little loss downstream.
As described above, in the screen frame 40 of the present invention, it is possible to alleviate water flow obstacles and at the same time reduce the loss of dust to the downstream side at the time of abnormality. Dust that is caught in the middle of the maze and prevented from passing is removed by running water flowing from the outlet 48a to the louver 48 when the screen frame is inverted.

The opening (exit) of the screen frame 40 of the present invention
The lid 48a is not provided with a lid for opening and closing the outlet 48a, but the running water passage 6 under normal conditions (when the amount of dust is small) is provided.
In order to prevent passage from 0 and to generate the flow B with the outlet 48a as an opening only when there is an abnormality, for example, the movable lid may be pressed against the outlet 48a via a compression coil spring to interrupt communication. . In this case, the water pressure applied to the screen frame 40 from the upstream side to the downstream side of the water channel at the time of abnormality is utilized to open the movable lid against the biasing force of the compression coil spring.

[0016]

As described above, in the dust removing device of the present invention, even if a water flow failure due to a sudden increase in dust occurs, a passage for running water from the louver to the outlet is secured, so that the water level is maintained. It suppresses the increase in the difference and prevents damage to the equipment. In addition, it is possible to reduce the amount of dust that is lost downstream due to the passage of running water to the louver. Therefore, continuous and stable operation is ensured, and the maintainability is significantly improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a screen frame of a dust remover according to an embodiment of the present invention.

FIG. 2 is a rear front view of the screen frame of the dust removing device according to the embodiment of the present invention.

FIG. 3 is an overall schematic diagram of a conventional dust removing device.

FIG. 4 is a vertical cross-sectional view of a screen frame of a conventional dust removing device.

FIG. 5 is a front view of a screen frame of a conventional dust removing device.

[Explanation of symbols]

 1 Upper sprocket wheel 2 Lower sprocket wheel 3 Link chain 3a Link chain 3b Roller 4 Screen frame 5 Power unit 6 Transmission chain 7 Chain wheel 8 Upper sprocket wheel shaft 9 Guide plate 10 Trough 14 Screen body 15 Upper beam 16 Mounting plate 16a Bolt Nut 17 Lower beam 18 Mounting plate 19 Side plate 20 Bolt nut 21 Dust bucket 40 Screen frame 41 Upper frame 42 Lower frame 42a Bucket 43 Side plate 44 Middle frame 44a Bucket 45 Opening 48 Louver 48a Outlet 51 Net screen 60 Flow path A Flow B Flow B L Link Chain movement direction F Flowing water flow direction

Claims (1)

[Claims] 1. A dust remover in which a screen frame provided with a net screen for collecting dust is joined to an endless link chain, and the link chain is driven through a pair of upper and lower sprocket wheels. Top and /
Alternatively, the dust remover is characterized in that an opening is provided at an intermediate portion and a passage for flowing water is formed on the front side of the opening through a louver composed of a plurality of obliquely parallel flat plates.