JPH03119217A - Dust filter - Google Patents

Abstract

PURPOSE:To improve safety by a method wherein an endless link chain is stretched on the upper stream side or the downstream side, and an intermediate sprocket wheel horizontally movable forward and backward is provided. CONSTITUTION:Usually, refuse flowing from the upper stream side is brought into contact with a frame body 4 and the progress thereof is blocked by means of a net body or a bar train. With the elevation of the frame body, more amount of refuse is contained in a refuse bucket, and the moving direction of the frame body is changed in a 90 deg. arc by means of a guide sprocket wheel 120. The frame body 4 is moved through an intermediate sprocket wheel 100 and a guide sprocket 110 as refuse is discharged from the bucket, and is turned over by means of an upper sprocket wheel 1 and moved toward a water passage 12 again. During emergency in which quantities of duckweed enter, the intermediate sprocket wheel 100 is horizontally moved in a manner to be spaced away from a dust filter, and the height of a lower sprocket wheel 2 is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dust removal device for removing dust from seawater or river water, and particularly to a structure for minimizing the difference in water level before and after the dust removal device.

[Prior Art] Conventionally, commonly used dust removal devices have been widely used in industrial water canals or waterways for taking cooling water in power plants, etc., and the most well-known type is A link chain is provided on both sides, and a bar screen or wire mesh is installed perpendicularly or almost perpendicularly to the flow direction for each link of the link chain, and the water is caught in the mesh by rotating the link chain. There are structures that remove dust from the waterway.

4 and 5 show one embodiment of a conventional dust removal device, FIG. 4 is an overall schematic diagram, and FIG. 5 is a detailed longitudinal sectional view (&) and front view (b ).

In FIG. 4, 1 is the upper sprocket foil, 2 is the lower sprocket foil, and 3 is both sprocket foils 1.
2 is a link chain mounted in an endless manner; 4 is a frame body attached to the link chain 3 and has a bucket section for storing captured garbage in the lower part; 5 is an upper sprocket wheel via a transmission chain 6 and a chain wheel 7; 1 is a power device that transmits power, 8 is the shaft of the upper sprocket wheel 1, 9 is a trough 10
11 is a nozzle of the dust removing device, 12 is a flow channel, and arrow F indicates the direction of the flowing water.As shown in FIG. 14 is a mesh body made of a wire mesh or a large number of bars arranged in the shape of a plow, and is a member for blocking and scooping up dirt and debris in the flowing water.

Reference numeral 15 denotes an upper beam provided at the upper end of the net body 14, and this upper beam 15 is made of a shaped steel such as a pipe or channel steel having a suitable diameter depending on the width of the waterway, and is attached to the side thereof. The net body 14 is integrally fixed via a plate 16. Reference numeral 17 denotes a lower beam having a U-shaped cross section and provided at the lower end of the net body 14, and this lower beam 17 rotatably covers the upper part of the upper beam 15 of the frame body 4 adjacent to the lower part of the lower beam 17. A mounting plate 18 provided on the
The frame body 14 is integrally fixed through. Reference numeral 19 denotes a side plate that holds the net body 14 from its side, and this side plate 19
has a width wider than the link width of the link chain 3 as shown in FIG. 5(a), and has an upper beam 15 and a lower beam 1.
They are integrally fixed to the left and right end surfaces of 7, respectively. In other words, the side plate 19, the upper beam 15, and the lower beam 17 form the frame 4. This frame body 4 has its side plate 19 connected to the link 3a by the port 20.
It is fixed to the link chain 3 by fixing it to the side surface of the link chain 3. Reference numeral 21 denotes a garbage packet protruding from the lower beam 17. This garbage packet 21 is provided so as to obliquely cover the lower front part of the net body 14, and its left and right ends are connected to the side plate 19 via the support plate 22. is integrally fixed to. Note that 60 is a spray pipe installed on the back of the net 14 that is descending, and is used to remove dust adhering to the net 14 by spraying water onto the back of the net 14 as shown by the chain line. It is something. Therefore, garbage floating in the flow is first blocked by the net 14, and as the link chain 3 rises, it is scooped up by the garbage packet 21, and the garbage packet 21 containing the garbage is scooped up by the garbage packet 21.
further rises, becomes horizontal at the top of the upper sprocket (1), and then turns around and descends.

Then, the garbage existing in the garbage packet 21 falls due to its gravity, is guided by the outer surface of the 1 m garbage packet 21 and the guide plate 9, and is discharged into the trough 10. On the other hand, the dust adhering to the net body 14 is separated by the spray water and is discharged into the trough 10 via the outer surface of the dust bucket 21 and the guide plate 9 as described above.

The endless link chain 3 to which the frame body 4 constructed as described above is joined is normally driven by an upper sprocket wheel 1 having about six teeth as shown in FIG. Note that the L arrow indicates the link chain driving direction.

[Problem to be solved by the invention] In recent years, as the amount of water intake has increased, the width of the waterways has become wider, and there has been a tendency for the amount of debris floating in the waterways to increase.
When a large amount of dust such as water matrix floods in, it exceeds the processing capacity of the installed dust removal equipment, and the dust cannot be processed completely, and the water-permeable parts of the frame such as the mesh frame or bar frame gradually become inundated. Eventually, it became blocked and it became impossible to secure sufficient water flow, leading to a situation where the difference in water level before and after the dust removal equipment rose rapidly.

For this reason, if the water level difference before and after the dust removal equipment exceeds a certain value, the pressure of the flowing water applied to frames such as mesh frames and bar frames will become excessive and cause structural damage to the equipment. Measures were taken such as limiting water intake.

However, if such a situation occurs during the electricity demand period,
At the power plant, the supply of electricity could not keep up with the demand for electricity, resulting in a power outage, which was a serious emergency for the public.

[Means for Solving the Problems] The present invention solves the above problems and prevents abnormalities before and after due to overload of the garbage device when a large amount of garbage such as water mother temporarily flows in (hereinafter referred to as "emergency"). In order to eliminate the water level difference, a frame body (mesh frame or bar frame) equipped with a screen or bar for collecting dust is joined to an endless link chain, and the link chain is connected through a pair of upper and lower sprocket foils. The dust removal device to be driven has a configuration in which the above-mentioned sink chain is mounted on the upstream side or the downstream side, and an intermediate sprocket wheel that can move forward and backward in the horizontal direction is provided.

[Function] In the present invention, an intermediate sprocket foil on which a link chain is mounted is provided at an intermediate portion on the upstream side or downstream side between the upper and lower sprocket foils, and this intermediate sprocket is moved horizontally, thereby preventing the generation of a large amount of water matrix. In an emergency, the lower sprocket is raised and the distance between the upper and lower sprockets is shortened to allow the water flow to pass smoothly from the upstream side to the downstream side of the dust removal device, thereby eliminating the abnormal water level difference that occurs between the upstream and downstream sides.

After avoiding this temporary abnormal phenomenon and returning to the original normal state, the intermediate sprocket is horizontally moved again to the original position and operation continues.

By taking the measures described above, it is possible to minimize the water level difference between upstream and downstream, thereby ensuring equipment safety and water intake.

[Example] Examples of the present invention will be described in detail below.

1 to 3 show an embodiment of the dust removal device according to the present invention, FIG. 1 is an overall schematic side view, FIG. 1(a) is a normal operating state, and FIG. 1(b) is a FIG. 2, which shows the operating state in an emergency, is a plan view taken along line nn in FIG. 1(a).

Moreover, FIG. 3 is an overall schematic side view showing another embodiment of the present invention, FIG. 3(a) is a normal operating state, and FIG. 3(b)
indicates the operating status in an emergency.

In the figure, l is the upper sprocket foil, 2 is the lower sprocket foil, 3 is the link chain, 4 is the frame, 5 is the power unit, 6 is the transmission chain, 110, 120 is the guide sprocket foil of the link chain, and 100 is the intermediate sprocket. a guide sprocket foil 110,1
20 is rotatable and has a fixed position Km, the intermediate sprocket wheel 100 is rotatable, and as shown in FIG.
a, and is configured to be able to reciprocate in the horizontal direction.

In the embodiment of FIG. 1, the lower guide sprocket wheel 1
A garbage dumping trough (not shown) is provided near the frame 20, and the garbage collected in the packets of the frame 4 rising from below is discharged when the frame 4 is rotated in the 90'' direction.

Fig. 3 shows another embodiment, in which the intermediate sprocket wheel 100 is arranged at the front (upstream side) in the first embodiment shown in Fig. 1, whereas it is arranged at the rear (downstream side). The difference is that the trough 10 for discharging dust is provided in the position shown in FIG.
It is not necessary to provide it near 20.

As shown in FIG. 5, the frame 4 forms a rectangular parallelepiped in which an upper beam 15 and a lower beam 17 are connected by side plates 19, 19, and a net 14 is stretched over the entire surface on the downstream side of the waterway, or Alternatively, a plurality of bars having the inner dimension of the frame 4 are erected between the upper and lower beams 15 and 17, and arranged at approximately equal pitches in the width direction of the frame 4.

The mesh size of the net body 14 is appropriately selected from 6 to 30 mm.

In the case of a bar frame, the bar gap is in the range of 10 to 50 mm and is determined depending on the state of dust (size, amount of inflow) at the place of use. A garbage bucket 21 is provided at the bottom of the frame 4 via a support plate 22. In addition to a flat plate, the garbage packet 21 may be made of ordinary wire mesh or punched metal.

The operation of the dust removal device of the present invention having a frame made of a bar or a mesh (wire mesh) configured as described above will be explained.

When there is not so much garbage, that is, in normal times, the image shown in FIG. 1(a) (FIG. 3(a) in the second embodiment)
As shown in the figure, the debris floating in the flowing water flowing from the upstream side or on the surface of the driftwood comes into contact with the frame 4, is prevented from advancing by the net 14 or the row of bars, and moves downward according to the upward movement of the frame 4. It is moved, stored in the garbage bucket) 21, turned 90 degrees by the guide sprocket wheel 120, and while discharging the garbage, passes through the intermediate sprocket wheel 100 degrees and the guide sprocket 110, is turned around by the upper sprocket wheel L, and returns to the waterway. Leads to 12.

In the second embodiment, the frame body 4 rises as it is until it reaches the upper sprocket foil 1, and when the upper sprocket foil 1 is reversed, the dust is discharged.

On the other hand, in an emergency situation where a large amount of water mother flows in, both the first embodiment and the second embodiment are shown in FIG. 1(b).

As shown in FIG. 3(b), the intermediate sprocket foil 1
00 horizontally away from the dust remover to raise the height of the lower sprocket wheel 2. By doing this, the dust removal device, which has until now been located on almost the entire surface of the water channel 12 in the height direction, can secure a flow path space free of obstructions between the bottom of the water channel and the lower sprocket foil 2 in the event of an emergency. Therefore, even if the dust such as a water matrix that exceeds the processing capacity of the dust remover is pushed, there is a flow path with less resistance below the water channel 12, so the difference in water level between the upstream and downstream sides of the dust remover is reduced. In general, the water matrix has a relatively small specific gravity, often less than 1, and is therefore concentrated near the surface of the flowing water, so that the dust collection function continues even in an emergency. The horizontal movement of the intermediate sprocket wheel 100 can be performed arbitrarily by operating a hydraulic cylinder as described above.

When the generation of dust is reduced and normal operation is resumed, the intermediate sprocket wheel 100 is restored to its original position, thereby recovering dust collection over the entire surface of the waterway.

As explained above, in the present invention, by providing a horizontally movable intermediate sprocket foil, a flow path with low resistance can be formed in an emergency, so the difference in upstream and downstream water levels is small, and protection of equipment and water intake are ensured. can be realized.

[Effects of the Invention] In the present invention, a link chain is installed on the upstream side or the downstream side, and the intermediate sprocket foil that can move back and forth in the horizontal direction is hatted, so that the dust contained in the flowing water is temporarily removed. Even in a so-called emergency situation where there is a large amount of water, a flow path with low resistance can be ensured within the waterway. Therefore, the water level difference that occurs before and after the dust removal device can be kept as small as possible. Therefore, the load on each component of the dust removal device can be reduced, and damage to the device can be prevented, improving safety. In addition, since the minimum required water intake can be secured even in an emergency, continuous and stable operation is possible, increasing the reliability of equipment use, and improving equipment maintenance and operability.

[Brief explanation of drawings]

1 to 3 show an embodiment of the dust removal device according to the present invention, FIG. 1 is an overall schematic side view, FIG. 1(a) is a normal operating state, and FIG. 1(b) is a FIG. 2, which shows the operating state in an emergency, is a plan view taken along line II-II in FIG. 1 (&). Moreover, FIG. 3 is an overall schematic side view showing another embodiment of the present invention, FIG. 3(a) is a normal operating state, and FIG. 3(b)
indicates the operating status in an emergency. Figures 4 and 5 show examples of conventional dust removal equipment.
The figure is a schematic longitudinal sectional view of the entire body, and Figure 5 is a partially enlarged view of the frame.
FIG. 5(a) is a side view, and FIG. 5(b) is a front view. 1... Upper sprocket foil, 2...
・Lower sprocket foil, 3... Link chain, 4... Frame, 2... Channel, 4... Net body (or bar row), OO ...Intermediate tin rocket wheel, 10.120 River guide sprocket wheel, 02...Bearing, 130...Hydraulic cylinder. F...Flow direction of water, driving direction of link chain for L...

Claims (1)

[Claims] (1) In a dust removal device in which a frame body (mesh frame or bar frame) equipped with a screen or bar for dust collection is joined to an endless link chain, and the link chain is driven via a pair of upper and lower sprocket wheels. . A dust removal device, characterized in that the link chain is mounted on the upstream side or the downstream side, and an intermediate sprocket wheel that can move forward and backward in the horizontal direction is provided.