JP2002356832A - Bar screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bar screen device, in which the fluid resistance of a flow path is hard to rise and which has sufficient rubbish collection capacity. SOLUTION: The first bar screen 10 is composed of a plurality of the first flat bars 11 arranged at regular intervals in the direction orthogonal to the flow direction of a fluid. The second bar screen 20 is arranged on the downstream side of the flow of the fluid to the first bar screen 10, and consists of a plurality of the second flat bars 21. The first flat bar 11 and the second flat bar 21 are disposed at the same intervals, and arranged so that phase is displaced mutually at 180 deg.. The first and second flat bars 11 and 21 are disposed zigzag so that end sections on the downstream sides of the first flat bars 11 and end sections on the upstream sides of the second flat bars 21 are arranged on approximately the same surface. The first bar screen 10 is divided into upper and lower sections, upper sections can be slid vertically as movable screens 10a and lower sections are formed in a fixed type together with the second bar screen 20 as fixed screens 10b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar screen device used for a dust remover for removing contaminants mixed in a fluid such as seawater.

[0002]

2. Description of the Related Art In a power plant or the like, a water intake facility for guiding seawater to secure cooling water is used. In this type of water intake equipment, a dust remover for removing and collecting inflow material mixed into seawater is used. In recent years, the types of inflows have increased, such as weeding garbage and living-related garbage on river banks near power plants. There is a problem. For this reason, in the worst case, a power generation trouble occurs due to a decrease in the amount of cooling water of the condenser, and a reliable measure for removing these inflows is required.

[0003] Dust removal devices used in water intake facilities and the like generally include a rotary screen for collecting dust mixed in seawater, a bar screen for removing large dust and protecting the rotary screen, and a collecting place for collected dust. It has a certain place. Among these, the bar screen device is generally a fixed bar screen in which a plurality of rectangular flat bars are arranged in a screen shape. Further, conventionally, in order to prevent the screen from being clogged with foreign substances, a bar screen device in which flat bars are arranged so that irregularities are formed on the upstream surface of the screen (Japanese Patent Laid-Open No. Hei 2 (1994)).
No. 43406), and a bar screen device provided with an adjustment mechanism for adjusting the interval between the main bar screen and the auxiliary bar screen arranged at intervals in the flow direction in the water channel (JP-A-61-21215). It has been known.

[0004]

However, in the former conventional bar screen device, the slit formed by the flat bar extends long in the direction of flow, so that a straight water flow is formed. In the case where a flat deposit adheres to the unevenness on the upstream surface of the screen, the deposit adheres as it spreads and closes the flow path, resulting in an increase in flow resistance. In the latter, since the main body bar screen and the auxiliary bar screen are separated in the direction of water flow, a relatively large foreign substance to be removed flows downstream, and there is a problem that the dust trapping ability is poor. .

[0005] The present invention has been made in view of such problems, and an object of the present invention is to provide a bar screen device in which the flow resistance of a flow channel is unlikely to increase and which has a sufficient dust capturing capability.

[0006]

A bar screen device according to the present invention is provided in a bar screen device that is installed in a fluid and removes contaminants mixed in the fluid in a process of passing the fluid. A first bar screen comprising a plurality of first flat bars arranged at predetermined intervals in a direction orthogonal to the direction of flow, and a first bar screen on the downstream side of the flow of the fluid with respect to the first bar screen. A second bar screen comprising a plurality of second flat bars arranged at the same interval as the plurality of first flat bars, wherein the first flat bar comprises the second flat bar. So that the downstream end of the first flat bar and the upstream end of the second flat bar are arranged on the same plane with a phase shift of 180 degrees with respect to the bar. It said first and second flat bar is characterized in that are arranged in a staggered pattern.

According to the present invention, the first bar screen and the second bar screen are arranged in two stages with respect to the flow of the fluid, and the first flat bar and the second flat bar are mutually separated. Since the phase is shifted by 180 degrees and the downstream end of the first flat bar and the upstream end of the second flat bar are arranged substantially on the same plane, the fluid Can be positively bent, so that the deposit can be prevented from adhering while spreading. Further, since the downstream end of the first flat bar and the upstream end of the second flat bar are arranged on substantially the same plane,
A large space is not generated between the first flat bar and the second flat bar, so that the ability to capture dust can be sufficiently ensured.

It is preferable that the first bar screen is slidably provided in the direction in which the first and second flat bars extend with respect to the second bar screen. Further, the first and second flat bars may be arranged so as to extend in a vertical direction, and the first bar screen may be vertically divided so that only an upper portion is slidable upward. .

According to such a configuration, even if a water level difference occurs between the upstream and the downstream for some reason, the first bar screen or only the upper part thereof is slid by keeping the second bar screen. The difference in water level can be eliminated instantaneously. At that time, the slid first bar screen or only a part thereof can be cleaned and the bar screen can be restored. This is very effective as a measure for eliminating a water level difference when a large foreign matter is caught on the bar screen.

In particular, the first and second flat bars are arranged so as to extend in the vertical direction, and the first bar screen is divided into upper and lower portions so that only the upper portion can be slid upward. This solves the problem that sand or the like accumulates at the lower part of the flow channel, making it difficult to pull up the second bar screen, or preventing the second bar screen from being set again, thereby reducing the work load.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an outline of a bar screen device according to an embodiment of the present invention, wherein FIG. 1 (a) is a plan view and FIG. 1 (b) is a front view. The bar screen device includes a first bar screen 10 composed of a plurality of first flat bars 11 arranged at predetermined intervals in a direction orthogonal to the direction of fluid flow, and a first bar screen 10. And a second bar screen 20 which is disposed downstream of the fluid flow and includes a plurality of second flat bars 21. The first flat bar 11 and the second flat bar 21
They are arranged at the same interval and are arranged 180 degrees out of phase with each other. That is, the first and second bar screens 10 and 20 are arranged such that the second flat bar 21 is arranged in the middle between the first flat bars 11. The downstream end of the first flat bar 11 and the second flat bar 2
The first and second flat bars 11 and 21 are arranged in a zigzag pattern so as to be arranged on substantially the same plane as the upstream end of the first flat bar. The first bar screen 10
Is divided into upper and lower parts, the upper part of which can be slid up and down as a movable screen 10a, and the lower part is a fixed screen 10a.
b is fixed together with the second bar screen 20.

FIGS. 2 to 4 show a bar screen device according to a more specific embodiment of the present invention.
2A is a front view when the movable screen 10a is arranged at a normal position, FIG. 3B is a front view when the movable screen 10a is pulled up, and FIG. 3A is a cross-sectional view along AA 'in FIG. 3 (b) is a perspective view of FIG. 3 (a), FIG. 4 (a) is a sectional view taken along line BB 'of FIG. 2, and FIG. 4 (b) is a perspective view of FIG.

In these figures, parts corresponding to those in FIG. 1 are denoted by the same reference numerals. The movable screen 10a of the first bar screen 10 is formed in a lattice shape by connecting a plurality of first flat bars 11 extending in the vertical direction by connecting bars 12 at predetermined intervals in the vertical direction. The second bar screen 20 is formed by fixing a plurality of second flat bars 21 to the upstream side of a frame 23 which is a rectangular frame provided with the connecting bar 22 by welding or the like. The flat bar 11 of the fixed screen 10b of the first bar screen 10 is, as shown in FIG.
The flat bar 21 is fixed to the connecting bar 22 and the frame 23 together with the flat bar 21. On the upstream side of the frame 23, a guide frame 24 for guiding the movable screen 10a in the vertical sliding direction is provided. A projection 25 is formed on the outer surface of the frame 23, and the projection 25
Is mounted in the mounting groove 26 of the dust removing device or the like.

A guide groove 13 is formed on the back side of the movable screen 10a, and the front edge of the flat bar 21 of the second bar screen 20 is fitted into the guide groove 13 so that the movable screen 10a is connected to the second bar screen. The guide 20 is guided vertically. A wire 14 is connected to the upper end of the movable screen 10a. The wire 14 is wound up and rewound by the hoist 15, so that the movable screen 10a slides up and down.

According to the bar screen device of this embodiment configured as described above, the downstream end of the first flat bar 11 and the upstream end of the second flat bar 21 are on the same plane. So that they are 180 ° out of phase with each other.
Since they are arranged in a staggered manner with different degrees, FIG.
As shown in (a), the flow of the fluid can be positively bent, and as a result, as compared with the conventional example in which the water flow is simply provided with irregularities on the upstream side as shown in FIG. It can be prevented from adhering while being spread.

Also, as shown in FIG. 6B, the downstream end of the first flat bar 11 and the upstream end of the second flat bar 21 are arranged on substantially the same plane. Therefore, as shown in FIG. 6A, the first flat bar 11
There is no large gap between the first flat bar 21 and the second flat bar 21. Therefore, the ability to capture dust can be sufficiently ensured.

Further, even if a water level difference occurs due to any cause, as shown in FIG. 2 (b), only the movable screen 10a is pulled upward by the hoist 15, so that the opening is doubled and instantaneous. The water level difference can be eliminated.
At this time, it is possible to clean the raised movable screen 10a, slide the screen downward, and return the opening of the screen to its original position. This is very effective as a measure for eliminating a water level difference when a large foreign matter is caught on the movable screen 10a.

Further, the present apparatus comprises a first bar screen 1
Since 0 is divided into upper and lower parts and only the upper part is movable,
There is no difficulty in raising the bar screen due to accumulation of sand at the lower part of the bar screen device, and the operation of raising the movable screen 10a is extremely easy.

[0019]

As described above, according to the present invention, the first bar screen and the second bar screen are disposed in two stages with respect to the flow of the fluid, and the first flat bar and the second bar screen are arranged. The two flat bars are arranged out of phase with each other by 180 degrees, and the downstream end of the first flat bar and the upstream end of the second flat bar are arranged on substantially the same plane. As a result, the flow of the fluid can be actively bent, so that the sediment is
In addition to being able to prevent adhesion while being spread, a large space is not generated between the first flat bar and the second flat bar, so that the ability to capture dust can be sufficiently secured. To play.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a main part of a bar screen device according to an embodiment of the present invention.

FIG. 2 is a front view showing further details of the bar screen device.

FIG. 3 is a cross-sectional view of the bar screen device,
It is A 'sectional drawing and a perspective view.

FIG. 4 is a cross-sectional view of the bar screen device of FIG.
It is B 'sectional drawing and a perspective view.

FIG. 5 is a diagram for explaining the effect of the bar screen.

FIG. 6 is a diagram for explaining another effect of the bar screen.

[Explanation of symbols]

10: first bar screen, 11: first flat bar, 12, 22: connecting bar, 13: guide groove, 14: wire, 15: hoisting device, 20: second bar screen,
21: second flat bar, 23: frame, 24: guide frame, 25: protrusion, 26: mounting groove.

Continuing from the front page (72) Inventor Tatsuo Tanioka 1980, Kogushi-ji, Ube-shi, Ube City, Ube-shi, Yamaguchi Prefecture Inside Ube Industries Machinery Co., Ltd. Inside the plant service

Claims (3)

[Claims] 1. A bar screen device installed in a fluid to remove contaminants mixed in the fluid in a process of passing the fluid, wherein the bar screen device is arranged at a predetermined interval in a direction orthogonal to a direction of a flow of the fluid. A first consisting of a plurality of first flat bars arranged
And a plurality of second flat bars arranged on the downstream side of the fluid flow with respect to the first bar screen and arranged at the same interval as the plurality of first flat bars. A second bar screen, wherein the first flat bar is arranged to be out of phase by 180 degrees with respect to the second flat bar, and a downstream end of the first flat bar and the second flat bar. A bar screen device, wherein the first and second flat bars are arranged in a staggered lattice so that the upstream end of the second flat bar is arranged substantially on the same plane. 2. The method according to claim 1, wherein the first bar screen includes the second bar screen.
The bar screen device according to claim 1, wherein the bar screen device is slidably provided in a direction in which the first and second flat bars extend with respect to the bar screen. 3. The first and second flat bars are arranged so as to extend in a vertical direction, and the first bar screen is vertically divided and only an upper portion is provided so as to be slidable upward. The bar screen device according to claim 1, wherein: