JP2755337B2 - 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. 6 to 8 show examples of a conventional dust removing apparatus.
6 is an overall schematic view, FIG. 7 is a detailed sectional view of a screen frame having a bucket portion, and FIG. 8 is a front view.

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

[0005] As shown in FIG. 7, the screen frame 4 is attached at every pitch of the link chain 3.
A screen main body 14 composed of a plurality of bar members arranged in a wire mesh or plow shape is attached to this. 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.
Reference numeral 5 denotes a pipe having a diameter suitable for the width of the water channel, the center of which is set to be at the center of the roller 3b of the link chain 3, and the mounting plate 16 protruding from the lower portion of the pipe 3 via the mounting plate 16. 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 main body 14, and this side plate 19 has a width larger 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. 6, reference numeral 23 denotes a backwashing spray pipe disposed on the back side of the screen main body 14 which has been turned upside down through 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. The ascending wheel further rises, and the upper sprocket wheel 1 turns to reverse and descend. 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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dust removing apparatus which has a high dust adhesion rate, has a screen structure which is unlikely to be clogged, and has good drainage, paying attention to the above conventional problems.

[0013]

In order to achieve the above object, a dust removing apparatus according to the present invention is characterized in that an endless link chain is attached to a screen frame provided with a screen for collecting dust, and the link chain is connected to the link chain. A screen driven by a pair of upper and lower sprocket wheels, the screen has a corrugated shape having irregularities in the water inflow direction, and a plurality of plate-like bars extending vertically in the convex portion of the corrugated screen. In addition to the arrangement, the end faces of the bars in the water inflow direction are formed so as to have waveforms in the vertical direction, and the pitches of the waveforms of the end faces of adjacent bars are different from each other by a half cycle.

[0014]

In the dust removing device of the present invention, a corrugated screen is provided, and a plate-like bar extending vertically is disposed on the convex portion of the screen. In addition, since the adjacent bars have a configuration in which the wave pitches of the adjacent bars are shifted by half a cycle, the processing area of the dust that flows together with the flowing water from the upstream to the downstream of the water channel is large, and the relatively large dust between the bars is relatively small. Without covering the corrugated screen surface, it is blocked by two or more bars on the upstream side and prevented from proceeding downstream,
Prevent increase in water flow resistance.

[0015] Further, the large dust that straddles between the bars abuts against the end faces of the respective bars. However, since the position of each end face in the channel direction differs between adjacent bars, the dust is inclined not at right angles to the channel direction but obliquely. As a result, the projected area of the dust as viewed from the channel direction is reduced as compared with the case where the dust is orthogonal, so that the channel resistance is reduced accordingly. Further, in the case of dust that stops between three or more bars, for example, dead wood or bar-shaped dust, among the plurality of bars that come into contact, some of the intermediate bars do not come into contact with the dust, so that the gap is formed. The flowing water is easy to pass through, and the flow path resistance is reduced accordingly. By the above comprehensive effects, in the dust removing apparatus of the present invention, the water channel resistance between the upstream and downstream can be significantly reduced, and the difference in water level between upstream and downstream can be reduced.

[0016]

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.

FIG. 1 is a perspective view of a main part of a screen applied to the dust removing apparatus according to the embodiment. This screen is a mesh screen 30. The screen main body 32 held by the screen frame 4 is formed by a filter net, and the filter net is formed as a corrugated net instead of a flat net, and is attached to the screen frame 4. It has a structure. That is, the screen frame 4 is formed by the upper beam 15 (a channel material having a U-shaped cross section in the embodiment), the lower beam 17, and the side plate 19, and the screen body 32 is attached to a portion surrounded by the frame. As shown in the figure, the screen main body 32 is formed in a waveform such that irregularities are formed on the surface facing the flowing water direction F by waving along a direction orthogonal to the moving direction (arrow A) of the link chain 3. Installed. A mounting plate is fixed around the screen main body 32 in order to mount the screen 30 on the screen frame 4.
The mounting plates 34 and 36 for the lower beam 17 are formed in a waveform in the same manner as the screen main body 32, and are connected and fixed by screws or the like at the contact portions to the respective beams 15 and 17. Further, since the side edges of the screen main body 32 are straight edges, the corresponding side plates 19 are formed by a flat plate member as in the prior art.
What is necessary is just to couple | bond with the link 3a of the link chain 3. The side plate 19 has a large number of through holes 19 as shown in FIG.
a is provided. This through hole 19a has the same diameter and is orthogonal to the surface,
It is conceivable that the pipe has the same diameter and is inclined to the upstream side of the flowing water toward the outside, but any of them can be adopted.

Further, a flat bar 40 shown in FIG. 1 is provided on the front surface of the projection of the corrugated screen 32. The end face of each bar 40 on the upstream side of the water channel is formed in a waveform (sinusoidal shape) in the vertical direction, and the adjacent bars are arranged so that the cycle of the waveform is shifted by half a cycle. FIG. 2 is a plan sectional view of the screen 30. Also, as shown in FIG.
In addition to the bar 40A provided in the convex portion of No. 2, the bar 40 is provided in the concave portion.
B can also be provided. Further, a bar 42 having a rectangular notch 42a as shown in FIG. 4 may be employed instead of the waveform of the end face of the bar 40.

The operation of the dust removing apparatus using the rope-shaped screen 30 and the corrugated bar 40 formed in such a waveform is as follows. When the dust removing device is installed in a water channel, the screen main body 32 has unevenness in a portion facing the flowing water direction. When the refuse 38 such as a water carrier reaches the screen main body 32 together with the running water, as shown in FIG. 2, some of the dust directly reach the concave portion, while others reach the convex portion. Further, it is blocked and adheres to the end face of the bar 40. The water carrier and the like 38 that have passed between the bars and reached the convex portion move from the convex portion to the concave portion along the inclined surface of the corrugated screen 32 by the action of flowing water, and these dusts are intensively collected in the concave portion. Therefore, the protrusions are less likely to be clogged due to the attachment of dust, and as a result, the protrusions of the screen main body 32 can easily pass water and have less resistance components.

By forming the screen main body 32 into a waveform, the water passage area per unit projected area is 1.5 times as large as that of the conventional flat screen type screen main body 14. Therefore, the dust collecting area increases, and the degree of clogging (%) by the same amount of dust becomes 2/3. For this reason, it is possible to improve the collection efficiency of garbage while drastically reducing water flow resistance.

In addition, as shown in FIG. 5, for example, as shown in FIG. 5, three bars are formed on the convex portion of the corrugated screen so that the end faces are alternately shifted by a half cycle in the vertical direction. When a long garbage 38A (for example, a dead tree or a bar-shaped object) that straddles the bars 40, 40, 40 abuts on the bar 40, the garbage 38A and the bar 40 do not come into contact with the middle bar 40. The flow resistance can be somewhat mitigated since the flow can flow downstream through the gap. Also, as shown in the garbage 38B in FIG.
The dust caught on the two bars 40, 40, for example, is in contact with and adheres to the peaks and valleys of the end face waveform, and is positioned obliquely, not orthogonally to the flowing water direction. It is smaller than when the projected area is located at right angles,
The shunt water resistance is reduced. With these combined effects,
The corrugated bar 40 is 25 to 30% less than a bar that is not so, that is, a bar with straight ends.
It was confirmed by hydraulic experiments that the flow resistance, that is, the difference in water level before and after the dust removal device was reduced.

Further, among the side plates 19, in particular, the bucket 2
A large number of through holes 19a provided in the overhanging portion for the joint of 1 are provided on the side surface parallel to the flowing direction of the flowing water in the worst case where dust is covered on almost the entire uneven surface of the corrugated screen. Since it has the function of escaping running water downstream from the side plate 19,
Suppress increase in running water resistance.

With the above configuration, according to the embodiment of the present invention, it is possible to increase the collection efficiency of dust while lowering the water flow resistance, and particularly to reduce the dust such as a water carrier, seaweed, and a vinyl sheet. Even if it flows, it is trapped by the recesses and bars of the corrugated screen of the corrugated screen and can be prevented from adhering to the protruding portions, thereby reducing the adhering area. Further, even in a case where a large amount of dust is covered on the entire surface of the concavities and convexities, it is possible to drain water from the through holes in the side plates, so that a large difference in water level can be prevented. In addition to the bar, it is possible to prevent large dust such as wood chips and timber from directly abutting against the corrugated screen and damaging it, and to reduce the flow resistance by the action of the bar having the end face corrugated as described above. it can.

[0024]

As described above, according to the present invention,
Since the net-shaped screen is formed in a corrugated form, it is possible to improve the dust collection efficiency by increasing the water-passing area and at the same time to improve the water-blocking obstacle due to clogging. In addition, since the bar whose vertical surface is alternately shifted by a half cycle is arranged at the front convex part of the corrugated screen in the vertical direction, large dust can be directly contacted with the corrugated screen to prevent damage. At the same time, the water flow resistance is 25
Since it can be reduced by about 30%, the water level difference generated before and after the dust removal device can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of a dust removing apparatus of the present invention.

FIG. 2 is a cross-sectional plan view of a main part of a screen frame showing an embodiment of the dust removing apparatus of the present invention.

FIG. 3 is a cross-sectional plan view of a main part of a screen frame showing another embodiment of the dust removing apparatus of the present invention.

FIG. 4 is a perspective view of a bar showing another embodiment of the dust removing apparatus of the present invention.

FIG. 5 is a perspective view showing a dust collecting state in a screen frame of the dust removing apparatus of the present invention.

FIG. 6 is an overall vertical sectional view of a conventional dust removing device.

FIG. 7 is a longitudinal sectional view of a main part of a conventional dust removing device.

FIG. 8 is a front view of a conventional dust removing device.

[Explanation of symbols]

 4 Screen Frame 15 Upper Beam 17 Lower Beam 19 Side Plate 19a Through Hole 30 Mesh Screen 32 Screen Body (Wire Mesh) 34 Mounting Plate 36 Mounting Plate 40 Bar 40A Bar 40B Bar 42 Bar 42a Notch

Claims (1)

(57) [Claims] 1. A dust removing device in which a screen frame provided with a dust collecting screen is joined to an endless link chain and the link chain is driven via a pair of upper and lower sprocket wheels. It has a corrugated shape with irregularities in the direction, and a plurality of plate-like bars are provided along the vertical direction on the convex portion of the corrugated screen, and the end face of the bar in the water inflow direction is formed in a vertical waveform. A dust removing device, wherein the pitches of the waveforms of the end faces of adjacent bars are different from each other by a half cycle.