JPH06246112A - Dust collector using cylindrical screen - Google Patents

Abstract

PURPOSE:To surely remove dross even when a variation in inflow water rate is large. CONSTITUTION:A cylindrical screen 2 is arranged in a water passage 1 with its end on the upstream side being open and with its longitudinal axial center being along the passage 1. Above the cylindrical screen 2 are arranged washing nozzles 5 for making scraped dross fall. A discharge chute 6 for receiving the dross falling to inside the cylindrical screen 2 and a carrying conveyor 8 for carrying out the dross in the chute 6 to the water passage side are provided. Further, a frame 3 on an upstream side is provided with an overflow weir 31. Consequently if the quantity of inflow water is increased due to a rainfall, etc., only the excess quantity of water overflows to perform smooth filtration action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust remover using a cylindrical screen which can reliably remove residues even when the inflow of water changes greatly due to rainfall or the like.

[0002]

2. Description of the Related Art In a small-scale sewage treatment plant or the like, there is one that uses a cylindrical screen as a means for removing dust and the like in flowing water. This allows raw water to flow into the cylindrical screen,
The cylindrical screen is rotated to capture dust in the raw water on the inner peripheral surface of the cylindrical screen, and this is moved to the upper part of the screen by the rotation of the cylindrical screen. At the same time, it is dropped into the downflow trough provided in the screen, and flows out of the cylindrical screen and is discharged.

[0003]

Therefore, since the residue adhered to the inner peripheral surface of the cylindrical screen is dropped directly into the discharge chute into the cylindrical screen by the water sprayed from the nozzle, the discharged residue remains. Nozzle water is added to increase the amount of water, and it is necessary to separately drain the discharged waste, and there is a drawback that dust removal becomes impossible if the water level rises abnormally during rainfall.

It is an object of the present invention to easily drop the residue adhered to the inner peripheral surface of a cylindrical screen with a small amount of nozzle water, and to discharge the residue at a desired water content without using a separate draining means.

[0005]

The present invention has been made to achieve the above-mentioned object, and a cylindrical screen having an upstream opening in a water channel is arranged with its longitudinal axis along the water channel.
A washing nozzle for dropping the scraped residue is arranged above the cylindrical screen, and the residue attached to the inner surface of the cylindrical screen is dropped on the scraping plate to separate the washing nozzle water on the scraping plate. The screen residue on the scraping plate is discharged to the discharge chute by its own weight, but in some cases, a small amount of cleaning nozzle water is used to make the discharge more reliable. The gist of the present invention is to provide a discharge chute that receives the residue that falls into the cylindrical screen, a carry-out conveyor that carries out the residue that remains in the chute to the water channel side, and an overflow weir in the upstream frame.

[0006]

[Function] A plurality of scraping plates are projected on the inner peripheral surface of the cylindrical screen for inflowing and filtering the raw water, and by rotating the cylindrical screen, the residue contained in the raw water is removed. It is possible to capture and rake it by turning, and drop it into a chute provided in the cylindrical screen with a small amount of nozzle water to collect it. Further, since the overflow weir is provided above the upstream side frame of the cylindrical screen, even if the inflow water amount increases due to rainfall or the like, only the overflow amount overflows and a smooth filtering action can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dust remover using a cylindrical screen of the present invention will be described below with reference to the illustrated embodiments. In the figure, 1 is a water channel, and a cylindrical screen 2 having a required diameter and length and a screen mesh width is rotatably disposed at a predetermined position of the water channel 1.
The longitudinal axis of the cylindrical screen is aligned with the channel direction so that the raw water in the channel flows into the cylindrical screen 2 naturally, and the cylindrical screen 2 is rotated on the upstream side and the downstream side of the cylindrical screen 2. An upstream frame 3 and a downstream frame 4, which are movably supported, are provided respectively.

On the inner peripheral surface of this cylindrical screen 2, a plurality of scooping plates 21, 21 ... Are provided in the circumferential direction so as to project at arbitrary intervals, whereby the screen residue captured on the inner peripheral surface of the cylindrical screen. And the cleaning nozzle 5 is disposed above the outer peripheral top surface of the cylindrical screen, and the inner peripheral surface of the cylindrical screen is sprayed with water pressure from this nozzle. The screen residue attached to the surface and scraped off is peeled off and dropped on the scraping plate.

In detail, as shown in FIG. 3, the cylindrical screen 2 is provided with a discharge chute 6 which is arranged substantially in the center in the longitudinal direction of the screen and which is widened upward so that scraped residue scraped up is removed. The discharge chute 6 is made to fall and be collected by its own weight. Depending on the case, the cleaning nozzle 5a
May make the fall more reliable with a small amount of water.

Further, the cylindrical screen 2 is rotated by a driving device 7 provided above the downstream frame via a chain or other power transmission means, and the downstream end of the screen is closed and the upstream end is closed. It is opened to allow raw water to flow in.

An overflow weir 31 is provided above the upstream frame 3 that rotatably supports the cylindrical screen 2, preferably above the normal operating water level, so that the set water amount can be temporarily set when raining or the like. Even if a large amount of excess water does not flow into the screen, water above the allowable set water level is discharged from the overflow weir 31 to the downstream side of the water channel.

A screen discharge conveyor 8 is inserted through the opening on the upstream side of the cylindrical screen 2 so that the lower end of the conveyor reaches the inner bottom of the discharge chute. As a result, the residue in the discharge chute is automatically discharged to the outside of the cylindrical screen by driving the residue discharge conveyor 8.

If it is difficult to discharge the residue to a predetermined position with only one of the residue discharge conveyors 8, another discharge conveyor 9 can be used in combination as shown in FIG.

[0014]

The dust removing device using the cylindrical screen of the present invention has a cylindrical screen having an upstream opening in the water channel, the longitudinal axis of which is arranged along the water channel. Arrange a cleaning nozzle to drop the fried residue,
A small amount of cleaning nozzle is provided because the discharge chute that drops into the cylindrical screen and receives the residue and the carry-out conveyor that carries out the residue in this chute to the waterway side and the overflow weir in the upstream frame. It is possible to reliably collect and scrape off scraps that have adhered to the inner peripheral surface of the cylindrical screen with water and fall into the discharge chute inside the screen, and easily with a residue discharge conveyor and without using other draining means. It has the advantage that it can be carried out.

[Brief description of drawings]

FIG. 1 is a front view of a dust remover using a cylindrical screen of the present invention.

FIG. 2 is a side view of the cylindrical screen seen from the upstream side.

FIG. 3 is a vertical sectional view of a central portion.

FIG. 4 is a side view of the cylindrical screen seen from the downstream side.

[Explanation of symbols]

 1 Water Channel 2 Cylindrical Screen 3 Upstream Frame 31 Overflow Weir 5 Cleaning Nozzle 6 Discharge Chute 8 Outgoing Conveyor

Claims (2)

[Claims] 1. A cylindrical screen having an upstream opening in the water channel is arranged with its longitudinal axis along the water channel, and above this cylindrical screen is disposed a cleaning nozzle for scooping and dropping residue. A discharge chute for receiving the screen residue falling in the cylindrical screen, a carry-out conveyor for carrying the screen residue in the chute to the water channel side, and an overflow weir in the upstream frame. Dust removal device using a cylindrical screen. 2. A cleaning nozzle, in which a cylindrical screen having an opening on the upstream side in the water channel is arranged with its longitudinal axis along the water channel, and above which the screen residue attached to the screen is dropped onto a scraping plate. A dust remover using a cylindrical screen characterized by being arranged.