JPH05222714A - Dust collector - Google Patents

Abstract

PURPOSE:To restrain increase of water level difference between the upper stream and the lower stream of a dust collector even at generation and inflow of a large quantity of dust by providing a pair of right and left perforate flat plates in a screen frame, and providing a gate door on the upper stream side of the dust collector within a water passage. CONSTITUTION:A dust collector 100 in which a screen frame provided with a screen 14 for collecting dust is joined with an endless link chain and the link chain is driven by means of a pair of upper and lower sprockets, is provided. A pair of right and left perforated flat plates 30, 30 approaching in parallel with a water passage or chevron-likely facing to the lower stream are provided in the screen frame. A gate door 200 which is a biparting door opening on the lower stream side and whose door face is formed into perforated flat plate is provided on the upper stream side of the dust collector 100 in the water passage. Usually, the gate door 200 is left as it is fully opened, and dust is collected by means of the dust collector 100. Meanwhile, when a large quantity of dust such as jellyfish is let flow in unusually, the gate door 200 is maintained in half opened condition so as to let the dust flow mainly in the center part of the water passage and finally into the dust collector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing equipment for removing dust from seawater or river water, and more particularly to a dust removing equipment for alleviating and improving the water flow obstacle of a screen due to the attachment of dust to the screen.

[0002]

2. Description of the Related Art Conventionally, dust removers have been widely used in industrial water channels and water channels for cooling water in power plants. The most well-known dust remover of this type is provided with link chains on both sides of the water channel, and a bar screen or a screen made of wire mesh is provided for each link of the link chain perpendicular to the water flow direction or at a predetermined inclination angle. The screen is erected upright and is driven around the screen to remove dust adhering to the screen out of the water channel.

4 to 6 show examples of conventional dust removers,
In particular, FIG. 4 is an overall schematic view, FIG. 5 is a detailed vertical sectional view of a screen frame having a bucket portion, and FIG. 6 is a front view.

As shown in the figure, this dust removing device has an upper sprocket wheel 1 installed at the upper part of the water channel and a lower sprocket wheel 2 installed at the bottom of the water, and an endless link chain 3 is mounted on these. It is hung. The link chain 3 is provided with a screen frame 4 having a bucket portion for accommodating the captured dust attached to the lower portion thereof. The upper sprocket wheel 1 is rotated in order to move the screen frame 4 around, and therefore the chain wheel 7 is connected via the transmission chain 6. In FIG. 4, 8 is the shaft of the upper sprocket wheel 1, 9 is the trough 10
A guide plate for guiding dust to the housing, 11 a housing of the dust removing device, 12 a running water channel, and an arrow F indicating the direction of running water.

Further, as shown in FIG. 5, the screen frame 4 is mounted at every pitch of the link chain 3, and a screen main body 14 made of a plurality of bar members arranged in a wire mesh or a plow is mounted on the screen frame 4. Has been. The screen body 14 is a member that faces the running water, blocks the flow of dust and the like in the running water and collects it, and scoops it up by driving it to the link chain 3. An upper beam 15 is provided at the upper end of the screen body 14, and the upper beam 15 is made of a pipe having a diameter suitable for the width of the water channel.
The mounting plate 1 which is set so that its center is located at the center of the roller 3b of the link chain 3 and which is projected below the link plate 1
The screen main body 14 is integrally fixed via 6.

A lower beam 17 having a U-shaped cross section is provided at the lower end of the screen body 14, and the lower beam 17 is rotatable above the upper beam 15 of the screen frame 4 adjacent to the lower portion thereof. The screen body 14 is integrally fixed via a mounting plate 18 which is provided so as to cover and which is provided on the upper portion thereof.

A side plate 19 for holding the side edge is provided on the side edge of the screen body 14, and the side plate 19 has a width wider than the link width of the link chain 3 as shown in FIG. Moreover, they are integrally fixed to the left and right end surfaces of the upper beam 15 and the lower beam 17, respectively. In other words, the side plate 19, the upper beam 15 and the lower beam 17
Thus, a frame body (screen frame 4) for holding the screen body 14 is formed. In addition, the side plate 19 extends to the side of the bucket 21 which will be described later and is joined to the both ends of the bucket 21. The 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 a bolt 20. Further, a dust bucket 21 is provided on the lower beam 17, and is provided so as to obliquely cover the lower front of the screen body 14, and the left and right ends thereof are integrally fixed to the projecting portion of the side plate 19. There is.

In FIG. 4, reference numeral 23 denotes a backwashing spray pipe arranged on the back side of the screen body 14 which has been turned down by way of the upper sprocket wheel 1, and sprays spray water onto the back surface of the screen body 14. By doing so, the adhered dust is separated and removed.

According to such a dust remover, dust and the like floating in the flow are first blocked by the screen body 14 and scooped up by the dust bucket 21 as the link chain 3 rises, and the dust bucket 21 is removed. Ascends further and turns to reverse descent at the upper sprocket wheel 1. As a result, the dust that remains 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, along with the increase in the amount of water intake, the width of the water channel has become wider, while the dust particles floating in the water channel tend to increase. Particularly, a large amount of dust particles such as water mister flow in intensively. In the case of flooding, the processing capacity of the installed dust removing device is exceeded, the dust cannot be completely processed, the screen body 14 is gradually closed, and it becomes impossible to secure sufficient water flow before and after the dust removing device. This caused a situation where the water level difference between the two surged. The processing capacity of the dust remover is determined by the volume of the screen body 14 and the dust bucket 21 and the amount of dust that can be scraped up depending on the operating speed thereof.
The reality is that by the time the water reaches its capacity, the screen is clogged with water, causing an abnormal water level difference on the screen, resulting in an inoperable condition.

For this reason, when the water level difference before and after the dust removing device exceeds a certain value, the flowing water pressure applied to the screen body 14 and the screen frame 4 becomes excessively large, so that it is unavoidable to limit the water intake amount. I was taking action. However, if 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, resulting in a publicly significant abnormal situation such as a power failure.

The present invention focuses on the above-mentioned conventional problems, reduces the load on the dust remover of the main body when a large amount of water mister is generated and flows in, and prevents the water level difference before and after the dust remover from becoming abnormally large for safe operation. The purpose is to provide a dust removal facility that can continue

[0013]

In order to solve the above problems, the dust removing equipment of the present invention is a dust removing equipment comprising a dust removing device provided in a water channel and a gate installed upstream of the water channel of the dust removing apparatus. The gate has a double-opened shape that opens to the downstream side, and the door surface is formed of a flat plate with a hole. The dust removing device has a screen frame provided with an endless link chain and a screen for collecting dust. In the screen frame, a pair of left and right perforated flat plates suspended in parallel to the water channel or a pair of left and right perforated flat plates that are close to each other in a V-shape toward the downstream side are provided, and the link chain is paired up and down. Equipped with an electric motor driven through a sprocket wheel.

[0014]

In the dust removing equipment of the present invention, during the normal time when the dust flow is relatively small, the dust is collected by the dust removing device while the gate is left fully open. On the other hand, at the time of an abnormal situation where a large amount of dust such as water mister flows in, if the gate is kept half-opened and a large amount of dust flows mainly into the central part of the waterway to flow into the dust removal device, a large amount of dust will be generated. Even if it floods in, it will be captured densely near the center of the screen frame, and dust will not flow in near both ends of the screen frame, so the flow of water mainly flows through this part, so the difference in water level before and after the dust remover does not become so large. The perforated flat plate provided on the screen frame acts as a weir to prevent dust collected in the central part of the screen frame from moving to both sides together with running water.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the dust removing equipment according to the present invention will be described in detail below with reference to the drawings. The dust removal equipment of the present invention is
It consists of a dust remover and a gate installed on the upstream side of the waterway of the dust remover. 1 to 3 relate to an embodiment of the present invention, and FIG. 1 is an overall plan view of a dust removing equipment showing a normal operating state,
FIG. 2 is an overall plan view of the dust removing equipment and shows an operating state at the time of abnormality. FIG. 3 is a perspective view of a main part of a screen frame of the dust removing device. In the figure, 100 is a dust remover and 200 is a gate. 230, 230 are arranged. The door plate 230 has a screen frame 4 of the dust removing device 100.
A plurality of through holes 230a, which are about 2 to 5 times larger than the openings of the screen 14, are formed on the entire surface. On the other hand, the dust removing device 100 has substantially the same structure as that described in the prior art, and as shown in FIG. 3, a pair of left and right perforated flat plates 30, 30 are provided inside the screen frame 4 as shown in the figure. It is hung vertically downward in the waterway in a state of being close to each other. The perforated flat plate 30 may be parallel to the water channel. The diameter of the through hole 30a of the perforated flat plate 30 may be approximately the same as the mesh of the screen 14.

The operation of the dust removing equipment of the present invention constructed as above will be described. In a normal operation in which the amount of dust is relatively small, as shown in FIG. 1, the gate 200 is fully opened and all the running water in the water channel is treated by the dust removing device 100 to collect the dust and discharge it from the water channel. When a large amount of dust such as water mister flows in, that is, when there is an abnormality, as shown in Fig. 2, the gate 2
The door plates 230, 230 of No. 00 are held in a half-open state.
In this way, the dust that flows in from the upstream of the water channel 12 is guided by the half-open door plate 230 and intensively flows into the central portion of the water channel. Therefore, in the screen frame 4 of the dust removing device 100 that processes these dust particles, the dust particles are densely collected in the central portion, and the screen frame 14 circulates around the edge portions on both sides with relatively little dust particles. As a result, the running water mainly flows to both sides, which reduces the obstacles to water flow. The pair of left and right perforated flat plates 30, 30 provided on the screen frame 4 have a function of preventing the dust particles in the central portion once collected by the screen frame 4 from laterally moving to both sides and covering the screen surface at the edge. To do. In order to hold the gate 200 in a half-open state, it is only necessary to connect a cord between the upper edge of the door plate 230 and the strut on the opposite shore. In short, the reason why the water level difference before and after the dust removing device becomes abnormally large is that the dust that flows in the entire screen surface is covered and the passing area of the running water is lost, and the present invention is intended to secure the running area of the running water. is there.

As described above, in the dust removing equipment of the present invention, the double door 200 opening downstream is provided upstream of the water passage of the dust removing device 100, and in the event of an abnormality, a large amount of dust that flows with running water is guided to the water passage. Introduced into the central part to remove dust 1
00, the central portion of the screen frame 4 of 00 makes it possible to facilitate the passage of running water by centralizing the uniform load on the entire screen surface of the screen frame.

[0018]

As described above, in the dust removing equipment according to the present invention, it is possible to prevent an increase in the water level difference before and after the dust removing device even in the case of an abnormality in which a large amount of dust such as water mister occurs. Therefore, stable continuous operation is possible without applying excessive force to the equipment and causing damage or shortening the life of the equipment, thus improving the maintainability.

[Brief description of drawings]

FIG. 1 is an overall plan view showing a normal operation state of a dust removing equipment according to an embodiment of the present invention.

FIG. 2 is an overall plan view showing an operating state of the dust removing equipment according to the embodiment of the present invention during an abnormality.

FIG. 3 is a perspective view of a main part of a screen frame of the dust removing device according to the embodiment of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional dust removing device.

FIG. 5 is a longitudinal sectional view of a main part of a conventional dust removing device.

FIG. 6 is a front view of a conventional dust removing device.

[Explanation of symbols]

 1 Upper sprocket wheel 2 Lower sprocket wheel 3 Link chain 4 Screen frame 12 Water channel 15 Upper beam 17 Lower beam 19 Side plate 30 Perforated flat plate 100 Dust remover 200 Gate 210 210 Strut 220 Hinge 230 Door plate 230a Through hole F Flow direction L Screen frame traveling direction

Claims (1)

[Claims] 1. A dust removing device comprising a dust removing device provided in a water channel and a gate installed upstream of the water channel of the dust removing device, wherein the gate has a double-opened shape that is opened downstream.
The door surface is formed of a flat plate with a hole, and the dust removing device is a pair of left and right hung vertically in parallel with the water channel in the endless link chain with a screen frame equipped with a screen for collecting dust. The dust-removal equipment provided with a perforated flat plate or a pair of left and right perforated flat plates that are close to each other in a V-shape toward the downstream side, and equipped with an electric motor that drives the link chain via a pair of upper and lower sprocket wheels.