JPH05230815A - Dust collector - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a dust remover that treats a large amount of dust that is generated in large quantities such as a water mister, and that has improved water impediment to the screen. [Structure] The number of teeth of the sprocket wheel is 10 to 20, the screen frame 4 is joined at every two pitches of the link chain 3, and the mesh screen 14 is corrugated so that unevenness is generated in the water inflow direction. The bucket 21 and the lower beam 17 are formed to have a cross section, and the bucket 21 and the lower beam 17 are made of a perforated plate or provided with an opening having a wire mesh attached thereto.

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 particularly for improving the collection efficiency and improving the water flow obstruction of the screen due to the attachment of dust to the screen. Dust removal device

[0002]

2. Description of the Related Art Conventionally, generally used dust removers have been widely used in industrial water canals or water canals for collecting cooling water in power plants. A link chain is provided on both sides, and a bar screen or a wire mesh screen is erected vertically or almost perpendicularly to the flow direction for each link of this link chain, and the dust caught on the screen is rotated by rotating it. There is a structure to remove it outside the waterway.

7 to 12 show one embodiment of a conventional dust remover, FIG. 7 is an overall schematic view, FIG. 8 is a meshing state diagram showing a meshing state of a sprocket for driving the dust remover and a link chain, and FIG. FIG. 10 is a detailed vertical sectional view and a front view of a screen frame having a bucket portion. Further, FIGS. 11 and 12 are explanatory views showing a rotating state of the sprocket.

In FIG. 7, 1 is an upper sprocket wheel, 2 is a lower sprocket wheel, 3 is a link chain mounted endlessly on both sprocket wheels 1, 2, and 4 is attached to a link chain 3 and captured by the lower part. A screen frame having a bucket portion for storing dust, 5 is a power unit for transmitting power to the upper sprocket wheel 1 via a transmission chain 6 and a chain wheel 7, 8 is a shaft of the upper sprocket wheel 1, and 9 is a trough 10 and dust. Is a guide plate for guiding the housing, 11 is a housing of the dust removing device, 12 is a flowing water channel, and F arrow is a direction of flowing water.

As shown in FIG. 9, the screen frame 4 is attached at every pitch of the link chain 3, and 14 is a screen main body, which is made of a wire mesh or a large number of bar members arranged in a plow shape, and is dust in running water. It is a member that prevents such things and scoops them up.

Reference numeral 15 is an upper beam provided at the upper end of the screen body 14, and the upper beam 15 is a pipe having a diameter suitable for the width of the water channel, and the center of which is the roller 3b portion of the link chain 3. The screen main body 14 is integrally fixed via a mounting plate 16 provided so as to be located at the center of the screen and projecting from the lower part thereof.
Reference numeral 17 denotes a lower beam having a U-shaped cross section provided at the lower end of the screen body 14, and the lower beam 17 rotatably covers the upper portion of the upper beam 15 of the screen frame 4 adjacent to the lower portion thereof. The screen main body 14 is integrally fixed via a mounting plate 18 provided on the upper part of the screen.

Reference numeral 19 denotes a side plate for holding the screen body 14 from its side portion. The side plate 19 has a width wider than the link width of the link chain 3 as shown in FIG. It is fixed integrally to each end face. In other words, the side plate 19, the upper beam 15 and the lower beam 17 form a frame body (screen frame 4) for holding the screen body 14. The frame body is fixed to the link chain 3 by fixing the side plate 19 to the side surface of the link 3a with the bolt 20. Reference numeral 21 denotes a dust bucket projecting from the lower beam 17. The dust bucket 21 is provided so as to obliquely cover the lower front part of the screen main body 14, and the left and right ends of the dust bucket 21 are provided with side plates 19 via a support plate 22. Is integrally fixed to. Reference numeral 23 is a spray pipe provided at the back of the descending screen 13 for ejecting spray water to the back surface of the screen 13 as shown by a chain line so as to remove the dust attached to the screen body 14. Is. Therefore, dust or the like floating in the flow is first blocked by the screen body 14, and is scooped up by the dust bucket 21 as the link chain 3 rises, and the dust bucket 21 containing the dust further rises, and the upper sprocket 1 It becomes horizontal at the top of, then flips and descends.

Then, the dust existing in the dust bucket 21 falls due to its gravity and is guided by the outer surface of the dust bucket 21 of the lower screen and the guide plate 9 to form the water channel 10.
Is discharged inside. On the other hand, dust and the like adhering to the screen body 14 is separated by the spray water and discharged to the trough 10 via the outer surface of the dust bucket 21 of the lower screen and the guide plate 9 as described above.

The endless link chain 3 to which the screen frame 4 constructed as described above is joined is usually driven by the upper sprocket wheel 1 having about 6 teeth as shown in FIG. The L arrow indicates the link chain drive direction.

[0010]

In recent years, as the amount of water intake has increased, the width of the water channel has become wider, while the dust particles floating in the water channel tend to increase. Therefore, there is a demand for increasing the size of the dust removing device and improving the dust removing capability. Is getting stronger.

Therefore, in order to cope with an increase in the amount of water taken by the existing dust remover, the operating speed of the normal dust remover (26 m
/ Min), if you try to drive it
With the conventional 6-tooth sprocket wheel, the horizontal position from the center of the sprocket of the link chain roller 3b that meshes with the upper sprocket wheel 1 changes depending on the flat tip state shown in FIG. 11 and the sword tip state shown in FIG. Therefore, when the driving speed is particularly high, the link chain 3 suspended between the upper sprocket wheel 1 and the lower sprocket wheel 2 reciprocates not only vertically but also horizontally during operation, and is connected to the screen. Due to the action of the weight of the frame 4 and the dust contained therein, the screen frame 4 violently pulsates with the link chain, which may shorten the life of the link chain and damage the equipment.
Therefore, the operating speed was limited to 8 to 10 m / min.

Even if a large machine having a large processing capacity corresponding to an increase in the amount of water intake is planned in advance, when the processing capacity exceeds the processing capacity due to a temporary large inflow of dust such as generation of a large amount of water mica, the operating speed is increased for the above-mentioned reason. However, there is an inconvenience that cannot be dealt with due to the increase of.

At the same time, when operating at a high speed, the dust bucket, which serves to store the collected dust, operates vertically in water at a high speed, so that a large pulling force is applied to the link chain and the life of the link chain is increased. There were some problems such as the power consumption of the electric motor being large due to the reduction of the pumping energy and the excessive pumping energy.

[0014]

In order to solve the above-mentioned problems, in the dust removing device of the present invention, an endless link chain is joined to a screen frame provided with a net screen for collecting dust, and the link is connected. In a dust removing device that drives a chain through a pair of upper and lower sprockets, the number of teeth of the sprockets is set to 10 to 20, and the screen frame is joined at every two pitches of the link chain,
The mesh screen is formed in a corrugated cross-section so that irregularities are generated in the inflow direction of water, and a dust bucket for accommodating trapped dust disposed in the water channel upstream side of the screen frame and a bottom beam bottom surface are provided with holes. A plate or an opening provided with a wire mesh was provided. Further, in the second invention, the operating speed of the link chain in the above dust removing device is 6 to 60.
A power unit that can change the rotation speed has been adopted so that it can be operated at a high speed range of m / min. Further, in the third invention, in the above dust removing device, a bar screen having a linear shape or a concavo-convex pattern on the front surface is provided on the front surface of the mesh screen at one cycle intervals or half cycle intervals corresponding to corrugated concavo-convex portions. ..

[0015]

In the present invention, since a sprocket wheel having a number of teeth of 10 to 20 is used instead of the sprocket wheel having a conventional number of teeth of 6 to 8, the sprocket teeth described with reference to FIGS. The difference in sword tip and flat tip arrangement is small,
As a result, the horizontal movement distance of the link chain during operation is small, and the pulsating vibration phenomenon of the link chain caused by this is small, so high-speed operation is possible and the processing capacity is increased.

Therefore, by making the power unit variable by the second configuration and providing the power unit capable of high-speed operation, it is possible to immediately cope with the case where a large amount of dust is temporarily included in the running water, and to remove dust. The water level difference occurring before and after the device can be kept relatively small.

Since the sprocket has multiple teeth, the pitch length of the link chain is shortened, and the height of the screen frame (or bar frame) attached to it is short, and the number of screen frames is increased. Frames (or bar frames) are attached every two pitches of the link chain to prevent an increase in the number.

Further, since the screen frame rapidly rises in water during high-speed operation, it is difficult for the running water surrounded by the bucket and the lower beam to be discharged from the screen frame. Therefore, a large force is applied to the link chain, but the running water is easily discharged. Since the through holes are given to the bucket and the lower beam, the above problems can be alleviated by forming a perforated plate or providing an opening to which a wire mesh is attached.

Further, since the mesh type screen has a corrugated shape, the dust adhering area is increased as compared with the case of the flat mesh. As a result, the amount of dust attached can be increased by the increase in area, and the dust removal capability is improved. In addition, dust particles attached to the mesh screen are concentrated on the uneven surface, particularly in the concave portions, and are difficult to adhere to the convex portions due to the action of running water. As a result, the blocking effect of dust on the convex parts is prevented, and water leakage due to clogging does not occur at this part.

Further, according to the third configuration, since the bar screen is installed on the front surface of the mesh screen in correspondence with the concave and convex portions every half cycle of the mesh screen, water mica or the like is caught in advance on the bar screen. It is possible to increase the dust attachment rate by reducing the area that is collected and attached to the mesh screen. In addition, if the bar screen has irregularities on the front surface, even if there is sticking by the bar screen, a step is formed at the tip of each bar, resulting in an irregular arrangement, and it is highly likely that dust particles are guided to the concave portions of the mesh screen. The dust removal function can be exerted.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 6 show an embodiment of a dust removing device according to the present invention, FIG. 1 is a side view showing a meshed state of a sprocket wheel and a link chain, FIG. 2 is a schematic perspective view of a screen frame, and FIG. 3 is a screen frame. FIG. 4 is a vertical sectional view, FIG. 4 is a front view of the screen frame, FIG. 5 is a sectional plan view showing another embodiment of the screen frame, and FIG. 6 is a perspective view showing another embodiment of the screen frame. In FIG. 1, the number of teeth of the sprocket wheels is 12, and 1 is an upper sprocket wheel, 2 is a lower sprocket wheel, and 3 is a link chain mounted on the sprocket wheels 1 and 2.
In the link chain 3, two types of link chain 3x and 3y are alternately arranged and connected. As shown in FIGS. 3 to 4, a plurality of bolt holes are formed in the link chain 3y, and a required screen frame or bar frame is fixed with bolt nuts. The screen frame 4 is composed of an upper beam 15, a lower beam 17, and four members of left and right side end plates 19 and 19 connected to each other. The screen main body (mesh) is formed in a wavy shape in the inflow direction of water. 14 is attached to the upper beam 15 and the lower beam 17 by bolts and nuts 16a and 18a which are pressed by a mounting plate 16 and a mounting plate 18, respectively. Also, the screen body may be attached by bending the ends of the side plates 19 into L-shapes at both ends and projecting them.

As described above, the screen body 14 does not have a filter mesh as a flat mesh, but as a corrugated mesh, it is corrugated along the direction orthogonal to the moving direction of the link chain 3 so that the surface facing the flowing water direction F has irregularities. Although it is molded and attached in a corrugated shape as it is formed, either a corrugated shape in the horizontal direction as shown in FIG. 2 or a corrugated shape in the vertical direction can be adopted.

As shown in FIG. 2, the lower beam 17
The dust bucket 21 for collecting dust is attached diagonally forward from the above, and the dust bucket 21 and the bottom plate of the lower beam 17 are formed with perforated plates, or a wire mesh is attached with an opening of an appropriate width. .. The purpose is to facilitate draining of the link chain during high speed operation and reduce the tensile force applied to the link chain 3.

The screen frame configured as described above is fastened to the link chain 3y having mounting holes on the left and right sides via the side plate 19 with bolts and nuts. The maximum vertical length of the screen frame is approximately twice the link chain pitch.
As shown in, the size of the screen frame is determined so that the space between the screen frames adjacent to each other in the vertical direction is about 10 mm. If this gap is made too large, some of the debris in the running water that cannot be collected will come out, and if it is made too small, adjacent screen frames will interfere when rotating with the sprocket wheel. Both the upper beam 15 and the lower beam 17 can be used by pressing light-weight shaped steel, and the lower beam 17 and the dust bucket 21 may be integrated. Further, although the screen main body 14 is a wire mesh, it is not limited to this and may be formed of a row of bars arranged in a wavy pattern in the vertical or horizontal direction.

The operation of the dust removing device of the present invention constructed as above will be described. When the dust remover of the present invention is installed at the intake for taking in seawater or river water in the state shown in FIG. 1 and the link chain is driven by the power unit, the dust in the running water comes into contact with the screen body 14 and is prevented from drifting. When the screen frame floats above the water, it is stored in the bucket portion 17a of the lower beam 17 due to the gravity of the dust itself. After that, the upper sprocket 1 is meshed and rotated, and the dust accumulated in the bucket portion 17a of the lower beam of the screen frame 4 which is turned upside down slides on the guide plate to move to a predetermined trough 1.
It is discharged to 0 and collected. The above operation is performed at a specified constant number of revolutions when the dust removal device is in the state where the initial processing capacity is sufficient and when there is a large amount of dust inflow temporarily. Correspond by number.
For this reason, a power plant that can be varied over the specified number of revolutions is adopted. During normal operation, the speed of the link chain is 6-
It is advisable to set the specified rotation speed to 10 m / min and select the power variable device so that an operating speed of 10 to 60 m / min can be obtained in an emergency (when there is a large amount of dust).

The operation of the dust removing device using the mesh type screen 14 formed in such a waveform is as follows. When this dust removing device is installed in the water channel, the screen body 14 has irregularities in the facing portion in the running water direction. When dust such as mica reaches the screen body 14 along with running water, some directly reach the concave portion and some reach the convex portion. However, dust particles such as mica reaching the convex portion move from the convex portion to the concave portion along the inclined surface due to the action of running water, and these dust particles are intensively collected in the concave portion. Therefore, the convex portions are less likely to be clogged due to the attachment of dust, and as a result, the convex portions of the screen body 14 facilitate water passage and reduce the resistance component.

By making the screen body 14 corrugated, the water flow area per unit projected area is 1.5 times as large as that of the conventional flat screen screen body 14. As a result, the dust collection area increases and the clogging degree (%) due to the same amount of dust becomes 1 / 1.5. For this reason, the collection efficiency of dust can be improved while significantly reducing the water flow resistance.

From the above, according to this embodiment,
The dust collection efficiency can be improved while lowering the water flow resistance. In particular, even when water muddy, seaweed, vinyl sheet, etc. adhere to the surface, they can be concentrated and collected in the concave part of the uneven surface to prevent the adhesion to the convex part. Therefore, the adhesion area can be reduced.

Further, in the third embodiment shown in FIG. 6, in the bar screen 30, the tips of the screen bars 30A and 30B are formed in a wavy shape so that the front surface of the bar screen 30 is formed in a wavy shape, and the wavy period is alternated. They are arranged so that they are shifted by a period. This prevents wood chips or long vinyl sheets from coming into contact with the screen to protect the screen wire mesh surface, and in the case of long dust particles (eg driftwood) that come into contact with three or more bar screens 30. Since there is no contact with the bar screen 30 in the middle, running water can flow downstream between the dust and the bar screen 30, which helps to reduce running water resistance.

[0030]

As described above, in the present invention, the mesh type screen is formed in a corrugated shape to improve the dust collection efficiency by increasing the water passage area and at the same time improve the water obstacle due to clogging, Set the number of teeth on the sprocket wheel to 10 to 2
Since it is set to 0, and the one pitch of the link chain is shortened by that amount, the dust removal device has an increased collecting area by using a large screen frame or bar frame having a height of approximately two pitches. Operation with less horizontal vibration is possible. As a result, high-speed operation is possible, the range of dust disposal capacity can be increased, and even if a large amount of dust is temporarily flowed in, the operating speed can be temporarily increased compared to normal operation. Since this can be dealt with, the water level difference before and after the dust removing device can be kept small, and stable water intake can be secured. In addition, the bottom of the bucket and the lower beam have openings with through holes and wire mesh attached, so even if the screen frame moves up and down in water at high speed, draining is easy and the pulling force acting on the link chain is reduced, reducing power consumption. It suppresses the increase and improves the safety and life of the equipment. further,
When a bar screen is installed in front of the waterway of the mesh screen, driftwood and long dust can be safely collected without damaging the mesh screen surface, and the increase in water resistance can be mitigated. .. Also, because high-speed operation is possible at all times, the width of the water channel is small, equipment costs for the equipment can be reduced, vibration and noise of the dust remover can be reduced, and the life of the equipment can be extended and the working environment can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a meshed state of a sprocket wheel and a link chain according to an embodiment of a dust remover of the present invention.

FIG. 2 is a schematic perspective view of a screen frame according to an embodiment of the dust removing device of the present invention.

FIG. 3 is a vertical cross-sectional view of the screen frame according to the embodiment of the dust remover of the present invention.

FIG. 4 is a front view of a screen frame according to an embodiment of the dust remover of the present invention.

FIG. 5 is a cross-sectional plan view of a screen frame according to another embodiment of the dust remover of the present invention.

FIG. 6 is a perspective view of a screen frame according to another embodiment of the dust removing device of the present invention.

FIG. 7 is an overall vertical sectional view of a conventional dust removing device.

FIG. 8 is a side view showing a meshing state of a sprocket and a link chain of a conventional dust removing device.

FIG. 9 is a vertical cross-sectional view of a screen frame of a conventional dust removing device.

FIG. 10 is a front view of a screen frame of a conventional dust removing device.

FIG. 11 is an explanatory diagram of a sprocket rotating state of a conventional dust removing device.

FIG. 12 is an explanatory view of a sprocket rotating state of a conventional dust removing device.

[Explanation of symbols]

 1 Upper sprocket wheel 2 Lower sprocket wheel 3,3x, 3y Link chain 3a Link chain 3b Roller 4 Screen frame (or bar frame) 5 Power unit 6 Transmission chain 7 Chain wheel 8 Upper sprocket wheel shaft 9 Guide plate 10 Trough 14 Screen Main body 14a Bar main body 15 Upper beam 16 Mounting plate 16a Bolt nut 17 Lower beam 17a Bucket part 18 Mounting plate 18a Bolt nut 19 Side plate 20 Bolt nut 21 Dust bucket 30 Bar screen 30A Bar screen 30B Bar screen 40 Through hole 50 Dust L link chain Direction of movement F Flow direction

Claims (3)

[Claims] 1. A dust remover in which a screen frame provided with a net-type screen for collecting dust is joined to an endless link chain, and the link chain is driven via a pair of upper and lower sprocket wheels. The number of teeth is 10 to 20, the screen frame is joined at every two pitches of the link chain, and the mesh type screen is formed in a corrugated cross section so that unevenness occurs in the water inflow direction. A dust removing device provided with a dust bucket for storing collected dust disposed on the upstream side of a water channel in the lower part of the frame, and an opening having a bottom plate of a bottom beam as a perforated plate or a wire mesh attached. 2. The dust remover according to claim 1, further comprising a power unit capable of varying an operating speed within a range of 6 to 60 m / min. 3. A bar screen having a linear shape or a concave and convex shape on the front surface is provided at the front surface of the mesh screen at one cycle intervals or half cycle intervals in correspondence with the corrugated concave and convex portions. 2 dust remover.