JPH042129B2 - - Google Patents

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, in commonly used dust removal equipment,
It is widely used for industrial water canals or waterways for intake of cooling water in power plants, etc., and the most well-known example is a link chain on both sides of the waterway, and a bar for each link of this link chain. There is a structure in which a screen or a wire net is installed perpendicularly or almost perpendicularly to the flow direction, and by rotating the net, debris caught in the net is removed 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 vertical sectional view a and a front view b of a frame body having a bucket portion.

In Fig. 4, 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 attached to link chain 3 and captured at the bottom. a frame body having a bucket part for storing the garbage;
is the axis of the upper sprocket foil 1, 9 is the trough 1
0 is a guide plate for guiding the dust, 11 is a housing of the dust removing device, 12 is a flow channel, and arrow F indicates the direction of the flowing water. As shown in FIG. 5, the frame body 4 is attached to each pitch of the link chain 3, and 14 is a mesh body, which is a wire mesh or a bar shaped like a spade.
This is a member that prevents and scoops up dirt and debris in flowing water. 15 is an upper beam provided at the upper end of the net body 14;
The 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 the mesh body 14 is integrally fixed to the side thereof through a mounting 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. The frame body 14 is integrally fixed via a mounting plate 18 which is provided and protrudes from the upper part of the mounting plate 18. 19
The net body 14 is a side plate that is held from the side, and this side plate 19 is attached to the link chain 3 as shown in FIG. 5a.
and has a width wider than the link width of the upper beam 1
5 and the left and right end surfaces of the lower beam 17, 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 is fixed to the link chain 3 by fixing its side plate 19 to the side surface of the link 3a with bolts 20. 21 is a garbage bucket protruding from the lower beam 17, and this garbage bucket 21 is connected to the net body 14.
It is provided to diagonally cover the lower front of the
Its left and right ends are integrally fixed to the side plate 19 via a support plate 22. Note that 23 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 spray water onto the back of the net 14 as shown by the chain line. It is something. Therefore, the 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 bucket 21, and the garbage and the like are scooped up by the garbage bucket 21 containing the garbage. 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 bucket 21 falls due to its gravity, is guided by the outer surface of the garbage bucket 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 trash 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 usually 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 waterways has become wider, and the amount of debris floating in the waterways has tended to increase. When there is a rush of inflow, it exceeds the processing capacity of the installed dust removal equipment and cannot handle all of the dust, and the water passage parts of the frame such as the mesh frame or bar frame gradually become blocked, and eventually there is no sufficient water flow. This resulted in a situation where the water level difference 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 occurred during the period of electricity demand, the power supply at the power plant could not keep up with the demand for electricity, resulting in a power outage, which was a serious public emergency.

[Means for Solving the Problems] The present invention solves the above problems and prevents abnormalities before and after due to overload of the dust removal device when a large amount of dust such as water matrix temporarily flows in (hereinafter referred to as "emergency"). In order to eliminate the water level difference, a frame body for collecting dust is joined to an endless link chain, a garbage bucket for storing dust is provided on the lower upstream side of the frame body, and the link chain is connected to a pair of upper and lower sprockets. In a dust removal device driven through a foil, a mesh frame is provided over the entire surface of the frame, and bars are provided at approximately equal pitches over the entire upstream side of the mesh.

Second, the frame body is inclined toward the upstream side of the waterway from the bottom to the top.

Furthermore, thirdly, a portion of the bottom surface of the garbage bucket is configured to have slits or a mesh body through which water can pass.

Fourthly, a seal plate for preventing the inflow of garbage is provided to protrude from the lower part of the bottom surface of the garbage bucket.

[Function] In the present invention, a net is provided over the entire surface of the frame, and bars are provided at approximately equal intervals over the entire surface of the frame, so that relatively large chunks of garbage in seawater are first removed. Passage is blocked by the bar rows located on the upstream side, and relatively fine dust that has passed through these bar rows is captured by the net at the rear stage.

Furthermore, according to the second configuration, the direction of the water flow passing through the frame can be changed from a horizontal flow to a downward flow, so that the garbage accumulated in the bar rows or the net can be quickly transferred to the garbage bucket below the frame. It can be transported and is effective in reducing water level differences.

Further, by adopting the third configuration, it is possible to increase the water flow area and at the same time reduce the pumping power that is scooped up by the bucket section during operation.

In the fourth configuration, the garbage that passes between the adjacent frames is guided to the lower frame and helps to make the water flow direction downward.

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

Figures 1 to 3 show an embodiment of the dust removal device according to the present invention, and Figure 1 shows a frame in which a net is stretched over the entire surface, and a row of bars is installed parallel to the height direction of the frame. Figure 2 shows another example (second example) in which the frame body is inclined toward the upstream side of the waterway from the bottom to the top. 3
The figure shows an embodiment (third embodiment) in which a seal plate for preventing the inflow of dust is provided.

The embodiments shown in FIGS. 1, 2, and 3 all show partially enlarged views of the frame of the dust removal device, and FIGS. 1a, 2, and 3 are longitudinal cross-sectional views, and FIG. b shows a front view.

In FIG. 1, the frame 4 forms a rectangle in which an upper beam 15 and a lower beam 17 are connected by side plates 19, 19, and a plurality of bars of the inner dimensions of the frame 4 are connected from the lower beam 17 to the upstream side of the waterway. 30 are erected and arranged at approximately equal pitches in the width direction of the frame.
Further, on the downstream side of the row of bars 30, they are attached to the side surfaces of the upper beam 15 and the lower beam 17, respectively, through the mounting plates 16 and 18 with bolts and nuts over the entire surface of the frame.

As described above, the garbage bucket 21 is provided on the upstream side of the lower part of the frame via the support plate 22.

The frame body 4 configured as described above has the side plates 19 and the link chain 3a connected by bolts 20 at the left and right ends of the frame body 4.
It is fastened and joined by. The spacing between the bars should be 20 to 100, taking into consideration the size of the debris in the flowing water.
Select as appropriate within the mm range. In addition, the mesh size of the mesh is selected within the range of 1/10 to 1/2 of the bar pitch.

In the first embodiment (Fig. 1), the frame bodies are connected almost vertically, but in the second embodiment (Fig. 2), these frames are arranged from the bottom to the top. The structure was constructed so that it slopes toward the upstream side. Then, the lower beam 17 was abolished and only the bucket 21 was used, and a slit 32 was provided on the bottom surface of the bucket 21. Furthermore, in the third embodiment, a seal plate 36 for preventing the inflow of dirt is added to the lower part of the bottom of the garbage bucket of the second embodiment.
were arranged as shown in Figure 3.

To explain the operation of the dust removal device having a frame body consisting of bars and a screen (wire mesh) configured as described above, in the first to third embodiments, water flows from the upstream side of the waterway (to the left in the figure). Relatively large debris floating in flowing water or on the surface of flowing water,
For example, for water motherboard or wood chips, first use the bar row 30 in the front.
The dust comes into contact with the dust remover, moves downward as the dust remover moves upward, and is stored in the dust bucket. On the other hand, relatively small pieces of dust pass through the space between the bars and come into contact with the screen (wire mesh) on the downstream side. Then, after similarly moving downward, the upper surface of the lower beam 17 or the garbage bucket, the net body 14 and the bar 3 are removed.
It is stored in the space (referred to as the bucket part) formed by the inner surface of the 0.

In this way, the collected dust is transferred to the fourth
As shown in the figure, the dust is discharged from the bucket part to the trough 10 via the guide plate 9 while being sprayed by the spray 23.

Next, regarding the second example and the third example,
To explain the differences from the first embodiment shown in FIG. 1, the upper beam 15 uses a pipe, the lower beam 17 also serves as a garbage bucket 21, and the frame 4 is not oriented vertically but upwardly from below. The structure is such that it slopes upstream as one goes to the top. Therefore, the garbage that comes into contact with the bar 30 or the net 14 is urged by the action of gravity and the downward water flow along this slope, and is quickly transferred to the bucket section compared to a vertical one or a reversely inclined one. Ru.

In addition, in order to promote the passage of water toward the bucket part quickly without creating a vortex in the bucket part, in the second embodiment (Fig. 2), a slit 32 is provided on the bottom of the garbage bucket, and in the third embodiment (Fig. In FIG. 3), an opening with a width close to almost the entire bottom of the garbage bucket is provided, and a net 34 is attached to cover the opening. Therefore, it is possible to form a smooth downward flow without creating swirls in the bucket part, so that not only can the water flow area be expanded, but also the power for lifting unnecessary fluid upward during operation can be reduced.

Furthermore, in the third embodiment, in order to prevent unremoved seawater from passing between the vertically connected frames,
It is preferable that a seal plate 36 for preventing the inflow of dust is provided protruding from the bottom surface of the garbage bucket at an inclination that is almost the same as the angle of inclination of the frame body, since it can improve the dust removal ability and support the formation of a downward flow of water. In addition, in the case where the lower beam 17 is used as in the first embodiment, it goes without saying that a seal plate 36 for preventing the inflow of dust is provided to protrude from the lower beam 17. Further, a perforated plate such as punched metal may be used instead of the slits on the bottom of the garbage bucket, and expanded metal or the like may be used for the mesh body 34 instead of a normal wire mesh.

Therefore, in an emergency such as when a large amount of water matrix is generated, the amount of dust in the flowing water with a normal dust removal device far exceeds that of the dust removal device and covers almost the entire surface of the net 14 of the frame 4 that is continuously rotating upward. As a result, the passage of the running water itself to the dust removal device is greatly obstructed. As a result, the water level difference that occurs before and after the dust removal device greatly exceeds the normal water level difference, and the water level on the upstream side is abnormally high, whereas the water level on the downstream side is abnormally low. Therefore, in the present invention, it is possible to perform so-called two-stage collection in which large pieces of garbage are removed in advance by the bar row and then fine pieces of garbage are collected. By employing the configuration of the present invention, these emergencies can be adequately coped with.

[Effects of the Invention] In the present invention, a row of bars is provided on the upstream side of the frame of the dust removal device, and a net is provided on the downstream side, and after roughly removing large items from the garbage with the bar on the upstream side, small items are removed. The garbage is captured by the net on the downstream side, and all the collected garbage is discharged out of the waterway when the frame is turned over, so it can be used in emergencies when the amount of garbage in the flowing water temporarily increases. Since the amount of dust covering the screen surface can be kept relatively small, the difference in water level 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.

In addition, by tilting the frame with the lower part of the frame toward the downstream side, the water flow is encouraged to flow downward, and the dust accumulated on the bar or net can be transferred to the bucket part more quickly, so the above-mentioned effects are further improved. do.

Furthermore, by installing slits on the bottom of the garbage bucket or changing it to a net, and installing a seal plate to prevent the inflow of garbage, the former can increase the water flow area, and the latter can improve the dust removal effect, as well as Since it further promotes the downward flow of water, it is possible to reduce the difference in water level between the front and rear in an emergency and reduce the pumping power of the bucket section, thereby reducing running costs and extending the life of the equipment.

[Brief explanation of drawings]

1 to 3 are partially enlarged views showing different embodiments according to the present invention, and FIG. 1a, FIG. 2,
FIG. 3 is a longitudinal sectional view, and FIG. 1b is a front view. Figures 4 and 5 show examples of conventional dust removal equipment,
FIG. 4 is an overall longitudinal sectional view, and FIG. 5 is a partially enlarged view of the frame, where a is a side view and b is a front view. 1... Upper sprocket foil, 2... Lower sprocket foil, 3... Link chain, 3a...
...Link, 3b...Roller, 4...Frame, 5...
Power device, 6...Transmission chain, 7...Chain wheel, 14
... Net body, 30 ... Bar, 32 ... Slit, 3
4... Net body, 36... Seal plate for preventing dust inflow,
F...Direction of flow of water, L...Direction of driving the link chain.

Claims (1)

[Claims] 1. A frame body for collecting dust is joined to an endless link chain, a dust bucket for storing dust is provided on the lower upstream side of the frame body, and the link chain is connected to a pair of upper and lower sprocket foils. What is claimed is: 1. A dust removing device driven by a dust removing device, characterized in that a net is provided over the entire surface of the frame, and bars are provided at approximately equal pitches over the entire upstream side of the net. 2. A dust removal device according to claim 1, wherein the frame body is inclined toward the upstream side of the waterway from the bottom to the top. 3. The dust removal device according to claim 1 or claim 2, wherein a part of the bottom surface of the garbage bucket is made of slits or nets through which water can pass. 4. Claim 1 or Claim 2, wherein a seal plate for preventing the inflow of garbage is provided protruding from the bottom of the bottom of the garbage bucket.
Or the dust removal device according to claim 3.