JPH0363309A - Dust removing device - Google Patents

Abstract

PURPOSE:To improve malfunction in the passage of water caused by sticking of dirts to a screen by providing net-type screens in corrugated section in a way of being wound round a pair of upper and lower wheels for making circular movement, and further by providing to the front thereof bar screens having protruding and recessed parts. CONSTITUTION:A screen main body 32 is formed of a corrugated net attached to a screen frame 4, an upper beam 15, a lower beam 17 and side boards 19, and is connected to links 3a of a linked chain 3. A net-type screen 30 made up therewith is installed to a waterway, and suspended matters including jellyfishes or the like 38 reaching there together with running water are moved, when reaching the protruding parts of the corrugated net, to the recessed parts and collected there in a lump. Thereby clogging in the protruding parts by sticking of dirts becomes hard to occur and the passage of water through the protruding parts of the screen main body 32 becomes easy. With such arrangement of devices, efficiency of collecting dirts can be improved with increased area for the passage of water and obstruction to the passage of water by clogging can be decreased.

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 in particular, to a dust removal device for improving water flow through a screen caused by dust adhering to the screen. Regarding equipment.

[Conventional technology]

Conventionally, dust removal devices have generally been widely used in industrial water canals and waterways for intake of cooling water in power plants and the like. The most well-known type of dust removal device is to install a link chain on both sides of the waterway, and for each link of this link chain, a bar screen or wire mesh screen is installed perpendicular to the water flow direction or at a predetermined angle of inclination. The structure is such that the screen is erected with a screen, and by rotating the screen, the dust adhering to the screen is removed from the waterway.

5 and 6 show an example of a conventional dust removal device, in particular, FIG. 5 is an overall schematic diagram, and FIG. 6 is a detailed sectional view (a) and front view (b) of a screen frame having a packet part. be.

As shown in the figure, this dust removal device has an upper sprocket wheel 1 installed at the top of the waterway and a lower sprocket wheel 2 installed at the bottom of the water, and an endless link chain 3 is attached to these wheels. has been done. link chain 3
A screen frame 4 is provided at the bottom of which is attached a packet portion for storing captured garbage. An upper sprocket wheel 1 is rotated to move the screen frame 4 around, and a chain wheel 7 is connected thereto via a transmission chain 6. In FIG. 5, reference numeral 8 indicates the axis of the upper sprocket wheel 1, 9 indicates a guide plate for guiding the dust to the trough 10, 11 indicates the housing of the dust removal device, 12 indicates a water flow path, and arrow F indicates the direction of water flow.

Further, as shown in FIG. 6, the screen frame 4 is attached to each pitch of the link chain 3, and a screen body 14 made of a wire mesh or a large number of bar members arranged in the shape of a plow is attached to this. ing. Screen body 1
Reference numeral 4 denotes a member that faces the flowing water, blocks the flow of dirt, etc. in the flowing water, collects it, and scoops up the dirt upwardly by the link chain 3. An upper beam 15 is provided at the upper end of the screen body 14, and this upper beam 15 is made of a pipe having a suitable diameter depending on the width of the waterway, and is arranged so that its center is located at the center of the roller 3b of the link chain 3. Installation +7 set at the bottom and protruding from the bottom
The screen body 14 is integrally fixed via i16. Further, a lower beam F having a U-shaped cross section is provided at the lower end of the screen main body 14, and this lower beam F is connected to the upper beam 15 of the screen frame 4 adjacent to the lower part of the lower beam F.
The screen main body 14 is attached to the screen body 14 through a mounting plate 18 that is provided so as to rotatably cover the upper part and protrudes from the upper part of the mounting plate 18.
are fixed integrally. A side plate 19 is provided to hold the 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. 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 a frame (screen frame 4) that holds the screen body 14. This screen frame 4 is attached to the link chain 3 by fixing its side plate 19 to the side surface of the link 3a with bolts 20.

Further, a garbage packet 21 is provided on the lower beam F, and is provided so as to obliquely cover the lower front part of the screen main body 14, and its left and right ends are integrally fixed to the side plate 19 via a support plate 22. ing.

In addition, in FIG. 5, 23 is a spray pipe for backwashing arranged on the back side of the screen body 14 which has turned inverted and downward via the upper sprocket wheel 1, and spray water is injected onto the back side of the screen body 14. This is to separate and remove adhering dust.

According to such a dust removal device, dust and the like floating in the flow are first blocked from flowing by the screen body 14;
As the link chain 3 rises, it is scooped up by the garbage packet 21, the garbage packet 21 further rises, and then reverses and descends at the upper sprocket wheel 1. As a result, the garbage remaining in the garbage packet 21 falls and is discharged into the trough 10 via the inclined surface of the garbage packet 21 and the guide plate 9.

[Problem to be solved by the invention]

By the way, in recent years, as the amount of water intake has increased, the width of waterways has become wider, and there has been a tendency for the amount of debris floating in the waterways to increase.In particular, when a large amount of debris such as water matrix floods into the waterway in a concentrated manner,
The screen body 14 gradually becomes clogged as the dust exceeds the processing capacity of the installed dust removal device and cannot be completely processed, and eventually it becomes impossible to secure sufficient water flow, and the water level difference before and after the dust removal device rapidly increases. This was causing the situation.

The processing capacity of the dust removal device is determined by the amount of dust that can be scraped up depending on the volume of the screen body 14 and the garbage packet 21 and the operating speed, but in reality, by the time that capacity is reached, the screen is blocked due to water flow obstruction due to screen clogging. Currently, an abnormal water level difference has occurred and the plant is unable to operate.

For this reason, if the water level difference before and after the dust removal device exceeds a certain value, the pressure of the flowing water applied to the screen body 14 and screen frame 4 will become excessive, so measures such as limiting the amount of water taken are unavoidable. was.

However, if such a situation occurs during the electricity demand period,
There is a problem in that the power supply at power plants cannot keep up with the demand, leading to power outages, which are extremely abnormal situations for the public.

The present invention has focused on the above-mentioned conventional problems, and aims to provide a dust removal device having a screen structure that has a high dust adhesion rate and is less likely to become clogged.

[Means to solve the problem]

In order to achieve the above object, the dust removal device according to the present invention has the following features:
In a dust removal device that includes a mesh screen that is moved around at least a pair of upper and lower wheels, and is installed across a waterway in a semi-submerged state, the mesh screen has irregularities in the direction of water inflow. It has a wavy cross section as shown.

In a second aspect, bar screens are provided on the front surface of the mesh screen at half-period intervals corresponding to the corrugated concave and convex portions. Furthermore, thirdly, the front surface of the bar screen has an uneven structure.

(Function) According to the first configuration, since the mesh screen is corrugated, the area of dust adhesion is increased compared to the case of a flat screen. Therefore, the number of dust-adhering crabs can be increased by the increased area, thereby improving the dust removal ability. Also,
Dust adhering to the net-type screen concentrates on the uneven surface, particularly in the concave portions, and becomes difficult to adhere to the convex portions due to the action of running water. This prevents the convex portion from being clogged with debris, and prevents water flow from being blocked due to clogging.

According to the second configuration, a bar screen is further installed in front of the mesh screen in correspondence with the uneven portions every half cycle of the mesh screen, so that water matrix etc. are collected in advance on the bar screen, and the bar screen is By reducing the area that adheres to the mold screen, the rate of dust adhesion can be increased. In addition, according to the third configuration, even if there is adhesion due to the bar screen, a step is formed at the tip of each bar, resulting in an uneven arrangement, which guides the dust to the recessed part of the mesh screen, resulting in a high dust removal function. can demonstrate.

〔Example〕

Hereinafter, specific embodiments of the dust removal device according to the present invention will be described in detail with reference to the drawings. Note that the same numbers are given to the same components as in the conventional example described above, and explanations thereof will be omitted.

FIG. 1 is a perspective view of a main part of a screen to be applied to a dust removal device according to an embodiment. This screen is a net type screen 30, and the screen main body 32 held by the screen frame 4 is formed of a sieved net, and the sieved net is not a flat screen but a corrugated net, which is attached to the screen frame 4. It has a structure. That is, the screen frame 4 is formed by an upper beam 15 (a channel member with a U-shaped cross section in the embodiment), a lower beam 17, and a side plate 19 (not shown), and the screen body 32 is attached to the part surrounded by this frame. As shown in the figure, the screen main body 32 is formed into a corrugated shape so that unevenness is formed on the surface facing the water flow direction F by waving along a direction perpendicular to the moving direction (arrow A) by the link chain 3. Has been installed. In order to attach this mesh screen 30 to the screen frame 4, a mounting plate is fixed around the screen body 32, and the upper beam 1
5 and the mounting plates 34, 36 to the lower beam 17 are formed in a corrugated shape similarly to the screen body 32, and are fixedly connected by screws or the like at the abutting portions to the respective beams 15, 17. Further, since the side edges of the screen main body 32 are straight edges, the side plates 19 corresponding thereto may be formed of straight members as in the prior art and connected to the links 3a of the link chain 3.

The operation of the dust removal device using the mesh screen 30 formed in such a corrugated shape is as follows. When this dust removal device is installed in a waterway, the screen main body 32 will have irregularities on the portion facing the water flow direction. When the water mother etc. 38 reaches such a screen main body 32 together with the running water, the second
As shown in the figure, some reach the concave portion directly, while others reach the convex portion. However, the water matrix etc. that reached the convex part 38
The dust moves along the slope from the convex portion to the concave portion due to the action of flowing water, and these particles are concentratedly collected in the concave portion. Therefore, the convex portions are less likely to be clogged due to adhesion of dust, and as a result, water can easily pass through the convex portions of the screen main body 32, and the resistance component is reduced.

By the way, by making the screen body 32 wave-shaped, the water flow area per unit projected area becomes 1.5 times as large as that of the conventional flat mesh screen body 14. Therefore, the dust collection area increases and the degree of clogging (%) due to the same amount of dust becomes 1/1.5. Therefore, it is possible to improve the dust collection efficiency while significantly reducing the water flow resistance. Figure 3 shows the conventional screen body 14.
This figure compares the head loss caused by the dust removal device according to the present embodiment using the corrugated screen main body 32 and the case using the corrugated screen main body 32. In the conventional dust remover, the degree of clogging was 90% and the water level difference before and after the dust remover was 1.386 m (characteristic MP
), in this example, the degree of clogging is 6 for the same amount of dust.
0%, and the water level difference is 0.086m (characteristic line Q
).

Therefore, according to this embodiment, it is possible to increase the dust collection efficiency while lowering the water flow resistance.
Even if seaweed, vinyl sheets, etc. adhere to the surface, they are collected in a concentrated manner in the concave portions of the uneven surface and are prevented from adhering to the convex portions, thereby reducing the adhesion area.

Next, FIG. 4 shows an enlarged sectional view of the screen portion of the dust removal device according to the second embodiment. In this second embodiment, a bar screen 40 is further arranged in front of the screen main body 32 of the first embodiment. The difference is that

That is, screeners 40A and 40B are installed every half period of the wave period of the screen body 32 formed into a wave shape,
In particular, each screener 40A, 40B is attached to correspond to the convex portion and concave portion of the screen body 32, respectively. These screeners 4OA and 40B are flat plates,
The upper and lower beams 15 are arranged so that the plate surfaces are along the direction of water flow.
．． 17 and is attached. Then, the rear ends of the screen pars 4OA and 40B are joined to the screen body 32, and the tips of the screen pars 4OA and 40B are directed toward the upstream of the waterway.
By making the tip lengths of 0A and 40B different, the front surface of the par screen 40 itself is made to have irregularities. For this reason, the screen pars 40A having a small width and the screen pars 40B having a relatively large width are attached alternately to correspond to the convex portions and concave portions of the screen body 32 so as to be perpendicular to the screen surface, and in this state, the screen pars 40A
The tip of the screenper 40B is set to protrude more forward than the tip of the other screener 40B.

According to the second embodiment, the bar screen 4 further has an uneven surface on the front surface of the uneven screen main body 32.
0 is installed, it is possible to prevent damage to the mesh screen 30 due to the inflow of wood chips, etc., and also to capture large water bodies etc. with the bar screen 40 and prevent the mesh screen 30 from being damaged. Direct adhesion can be prevented, thereby reducing the area of adhesion to the mesh screen 30. Further, the front surface of the bar screen 40 itself is provided with unevenness, and each screen 1'' (-4OA, 4OA,
Since 0B is installed, even if there is dust that has passed through the bar screen 40, this screen par 4OA, 40
B acts as a guide to the concave portion of the screen body 32 and collects the dust intensively in the concave portion of the screen body 32, so that so-called separate collection on the net-type screen 30 is performed. The convex portion is always free from clogging, ensuring more efficient dust collection and water permeability.

In the above embodiment, when the screen body 32 of the mesh screen 30 is formed into a wave shape, it is formed in a direction perpendicular to the direction of movement by the link chain 3, so that the dust adhering to the recesses is swept along the recesses to the dust below. packet 21
However, the direction in which the waves are formed is not limited to the example and can be formed in any direction. Furthermore, it is also possible to form a waveform in the vertical and horizontal directions in which concavities and convexities are formed in a so-called matrix shape, although molding is somewhat difficult.

Furthermore, in the second embodiment, the bar screen 40 has screen pars 40A and 40A so that unevenness is formed on the front surface.
Although a step is formed at the tip of 40B, it is also possible to make the tips aligned. Needless to say, this ensures the ability to collect wood chips and the like in advance and prevent damage to the mesh screen 30.

〔Effect of the invention〕

As explained above, according to the present invention, since the mesh screen is formed in a corrugated shape, it is possible to improve the dust collection efficiency by increasing the water flow area, and at the same time, it is possible to improve the water flow failure caused by clogging, and the dust removal This provides the effect of effectively preventing abnormal water level differences from occurring before and after the device. Also,
By installing a bar screen with unevenness on the front surface of the corrugated mesh screen, it is possible to prevent damage to the mesh screen and to reduce the area on which dust adheres to the mesh screen. Furthermore, by forming the unevenness on the front surface of the bar screen, it is possible to obtain the effect that water flow resistance can be further reduced while maintaining high dust collection efficiency.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of the mesh screen applied to the dust removal device according to the embodiment, Fig. 2 is an explanatory diagram of the state of dust collection by the synchronized screen, and Fig. 3 is a diagram of the synchronized screen and the conventional mesh screen. Comparison of head loss characteristics due to screens; Figure 4 is a partial cross-sectional view of the screen applied to the dust removal device according to the second embodiment; Figure 5 is an overall sectional view of the conventional dust removal device; Figure 6 is the same dust removal device. FIG. 3 is a partially enlarged view of the screen frame of FIG. 4... Screen frame, 15... Upper beam, 17... Lower beam, 30...
Mesh screen, 32...Screen body, 3
4.36...Mounting plate, 40...Bar screen, 40A, 40B...Screen bar

Claims (3)

[Claims] (1) In a dust removal device that is equipped with a net-type screen that is rotated around at least a pair of upper and lower wheels and is installed across a waterway in a semi-submerged state, the net-type screen is set in the direction of water inflow. A dust removal device characterized by having a corrugated cross section so that unevenness is created. (2) A dust removal device characterized in that bar screens are provided at half-period intervals on the front surface of the mesh screen in correspondence with the corrugated uneven portions. (3) The dust removal device according to claim 2, wherein the front surface of the bar screen is provided with unevenness.