JP2655025B2 - Dust removal device - Google Patents

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 relieving and improving the flow obstruction of a screen due to the attachment of dust to the screen.

[0002]

2. Description of the Related Art Conventionally, a dust removing device has been widely used in a water channel for taking cooling water such as an industrial water channel or a power plant. The most well-known type of dust remover is that a link chain is provided on both sides of the water channel, and a bar screen or a screen made of wire mesh is provided at each link of the link chain in a direction perpendicular to the water flow direction or at a predetermined inclination angle. And the screen is driven to rotate to remove dust adhering to the screen out of the water channel.

FIGS. 4 to 6 show examples of a conventional dust remover.
4 is an overall schematic view, FIG. 5 is a detailed sectional view of a screen frame having a bucket portion, and FIG. 6 is a front view.

[0004] As shown in the figure, this dust removing device has an upper sprocket wheel 1 installed at the top of a water channel and a lower sprocket wheel 2 installed at the bottom of the water channel, and these are equipped with an endless link chain 3. It is suspended. The link chain 3 is provided with a screen frame 4 having a bucket portion for accommodating captured dust attached to a lower portion. The upper sprocket wheel 1 is rotated to move the screen frame 4 around, and a chain wheel 7 is connected via a transmission chain 6. In FIG. 4, reference numeral 8 denotes a shaft of the upper sprocket wheel 1 and 9 denotes a trough 10.
, A guide plate for guiding refuse, 11 a housing of the dust removing device, 12 a flowing water channel, and an arrow F indicates the direction of flowing water.

As shown in FIG. 4, the screen frame 4 is attached at every pitch of the link chain 3, to which a screen main body 14 composed of a plurality of bar members arranged in a wire mesh or plow shape is attached. Have been. The screen main body 14 is a member facing the running water and blocking the flow of dust and the like in the running water to collect the collected dust, and then scoops the collected dust upward by driving the link chain 3. An upper beam 15 is provided at the upper end of the screen main body 14, and the upper beam 15 is formed of a pipe having a diameter suitable for the width of the water channel.
The mounting plate 1 is set so that its center is located at the center of the roller 3b of the link chain 3, and protrudes below it.
6, the screen main body 14 is integrally fixed.

A lower beam 17 having a U-shaped cross section is provided at the lower end of the screen main body 14, and the lower beam 17 is rotatable above the upper beam 15 of the screen frame 4 adjacent to the lower portion. The screen main body 14 is integrally fixed via a mounting plate 18 provided so as to cover and protruding from the upper part thereof.

A side plate 19 for holding the side edge is provided at a side edge of the screen body 14, and this side plate 19 has a width wider than the link width of the link chain 3 as shown in FIG. The upper beam 15 and the lower beam 17 are integrally fixed to left and right end surfaces, respectively. In other words, the side plate 19 and the upper beam 15 and the lower beam 17
Thus, a frame (screen frame 4) for holding the screen main body 14 is formed. Further, the side plate 19 extends to the bucket 21 described later and is joined to both ends of the bucket 21. The screen frame 4 is attached to the link chain 3 by fixing the side plate 19 to the side surface of the link 3a with bolts 20. A dust bucket 21 is provided on the lower beam 17 so as to obliquely cover the lower front of the screen main body 14, and the left and right ends thereof are integrally fixed to the projecting portion of the side plate 19. I have.

In FIG. 4, reference numeral 23 denotes a backwashing spray pipe disposed on the back side of the screen main body 14 which has been inverted and lowered via the upper sprocket wheel 1, and sprays spray water onto the back surface of the screen main body 14. By doing so, the attached dust is removed and removed.

According to such a dust removing device, the dust and the like floating in the flow are first blocked by the screen main body 14 and scooped up by the dust bucket 21 as the link chain 3 rises. Then, the ascending wheel 1 is turned upside down. As a result, the dust remaining in the dust bucket 21 falls and is discharged to the trough 10 via the inclined surface of the dust bucket 21 and the guide plate 9.

[0010]

By the way, in recent years, the width of a water channel has been widened with an increase in water intake, while the amount of dust floating in the water channel has tended to increase. In the case of flooding, the processing capacity of the installed dust remover is exceeded, the dust cannot be completely processed, and the screen main body 14 gradually closes, and eventually it becomes impossible to secure sufficient water flow. Caused a sudden rise in the water level difference. The processing capacity of the dust remover is determined by the volume of dust that can be scraped up by the volume of the screen body 14 and the dust bucket 21 and the operation speed thereof.
The actual situation is that, before reaching the capacity, an abnormal water level difference occurs on the screen due to water flow obstruction due to clogging of the screen, causing the screen to be inoperable.

For this reason, when the water level difference between before and after the dust remover exceeds a certain value, the flowing water pressure applied to the screen main body 14 and the screen frame 4 becomes excessively large. I was taking action. However, when such a situation occurs during the power demand period, there is a problem that the power supply at the power plant cannot keep up with the demand, and a power outage causes a serious public abnormal situation.

The present invention pays attention to the above-mentioned conventional problems, and can prevent dust from covering the entire surface of the screen surface and causing water impediment, especially when dust is intensively attacked. It is another object of the present invention to provide a dust remover with good drainage.

[0013]

According to a first aspect of the present invention, there is provided a dust removing apparatus comprising a screen frame provided with a dust collecting screen and an endless link chain. A dust remover driven on the link chain via a pair of upper and lower sprocket wheels; and a dust remover disposed upstream of the water passage of the dust remover, inclined in such a manner as to gradually increase from the bottom of the water passage toward the downstream of the water passage, and A guide chute provided with a guide member which allows water flowing through the water passage to pass therethrough and guides dust in the flowing water obliquely upward along the slope. Further, in the second invention, the guide member is a perforated plate or a wire mesh, and in the third invention, the guide members are bars arranged in parallel in an oblique direction.

[0014]

In the dust remover of the present invention, a guide chute is provided on the upstream side of the water passage of the dust remover, and the guide chute is inclined obliquely upward from the bottom of the water passage. The water is transported along the waterway near the water surface, and collected on the water surface or a screen frame near the water surface. Therefore, the screen frame from the bottom of the channel to near the water surface collects only a relatively small amount of dust, so that the water flow resistance is small, and the water level difference before and after the dust remover is small.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the dust removing apparatus according to the present invention will be described in detail with reference to the drawings. The same components as those in the above-described conventional example are denoted by the same reference numerals, and description thereof is omitted. 1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall side view of a dust removing apparatus of the present invention, FIG. 2 is a perspective view of a guide chute showing one embodiment, and FIG. 3 shows another embodiment. It is a perspective view of a guide chute.

As shown in the figure, a guide chute 200 is provided upstream of the water channel of the dust remover 100. In the embodiment shown in FIG. 2, a perforated plate 230 having a width substantially equal to the width of the channel is affixed between the outer frames 210, 210 of both sides which are lower at the upstream side of the channel and higher at the downstream side. One end of the outer frame 210 is fixed to the channel bottom via a bottom plate 212, and the other end is similarly fixed to the channel bottom via a column base 220 and a bottom plate 222. The hole diameter of the perforated plate 230 is such that the dust contained in the water flow cannot pass through, and usually has a diameter of 10 to 30 mm. Perforated plate 230
Instead, expanded metal or wire mesh having a required opening may be used, but a type in which dust slides on the surface is desirable. It is desirable that the inclination angle of the outer frame 210 with respect to the bottom of the water channel be as small as possible so that dust easily slides on the guide chute surface. However, if the inclination angle is too low, the equipment becomes large. select. It is desirable that the height of the guide chute 200 is at least half or more of the height from the bottom of the water channel to the water surface (if the inclination angle is too large, the dust in contact with the guide chute does not easily move upward).

FIG. 3 shows a guide chute 200.
In this embodiment, a guide member 240 composed of round bars arranged in parallel in the vertical direction is provided between the outer frames 210 on both sides.
Then, a horizontal member 250 which is located below and orthogonal to the guide member 240 is provided, and the guide member 240 is fixed to the outer frames 210, 210 via the horizontal member 250. The bottom plate 212, the column base 220, and the bottom plate 222 are connected to the outer frame 210, and are fixed to the bottom of the channel as in the embodiment of FIG. Since the structure of the dust remover 100 is as described in the related art, the description thereof will be omitted.

The operation of the dust remover of the present invention configured as described above will be described. As shown in FIG. 1, when the guide chute 200 and the dust remover 100 are installed in the waterway, a large amount of dust, such as a water carrier, flowing from the upstream of the waterway, causes the screen frame immediately after the lower sprocket wheel 2 to be inverted. 4 does not come into contact with the guide surface of the guide cone 200 (perforated plate or wire mesh in FIG. 2, parallel bar in FIG. 3)
Although the flowing water passes through the guide surface as it is, the dust moves diagonally upward along the guide surface and is collected on the screen frame relatively near the water surface of the water channel. However, since the screen frame 4 near the water surface immediately moves onto the water surface in a short time, the water level difference between the upstream and downstream due to dust covering the entire screen surface is relatively small. Guide chute 2
Since only small dust that has passed through the guide surface is collected on the screen frame 4 moving in the area covered by 00, there is almost no resistance to water flow. Therefore, since the dust remover has a small water flow resistance as a whole, the water level difference between the upstream and downstream is kept small.

[0019]

As described above, according to the present invention,
Even in the event of a large amount of dust, such as a water carrier, rushing in, an obstacle to water flow due to the covering of the dust on the screen frame is small, and an increase in the water level difference between the upstream and downstream of the dust remover is suppressed, so that safe operation can be continued.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an embodiment of a dust remover of the present invention.

FIG. 2 is a perspective view of a guide chute showing one embodiment of the dust removing apparatus of the present invention.

FIG. 3 is a perspective view of a guide chute showing another embodiment of the dust removing apparatus of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional dust removing device.

FIG. 5 is a longitudinal sectional view of a main part of a conventional dust removing device.

FIG. 6 is a front view of a conventional dust removing device.

[Explanation of symbols]

 Reference Signs List 3 link chain 4 screen frame 14 screen body 15 upper beam 17 lower beam 100 dust remover 200 guide chute 210 outer frame 220 column base 230 guide member (perforated plate) 240 guide member (bar) 250 horizontal member

Claims (3)

(57) [Claims] An endless link chain is joined to a screen frame provided with a screen for collecting dust, and a dust remover driven to the link chain through a pair of upper and lower sprocket wheels, and a water path upstream of the dust remover. A guide member that is disposed on the side of the canal and is inclined so as to gradually increase from the bottom of the canal toward the downstream of the canal, and allows the flowing water of the canal to pass therethrough, and guides the dirt in the flowing water diagonally upward in the canal along the slope. A dust removing device comprising a guide chute provided. 2. The dust removing device according to claim 1, wherein the guide member is a perforated plate or a wire mesh. 3. The dust removing device according to claim 1, wherein the guide members are bars arranged in parallel in an oblique direction.