JP2003001020A - Rotary dust remover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary dust remover which surely prevents the trouble, such as the failure of a scraper, the generation of overtroque and the breaking of a roller chain for rotating a screen by connecting a screw and a rotary driver, facilitates maintenance, such as cleaning of the scraper and is capable of surely removing the impurities captured by the screen with a simple structure. SOLUTION: This rotary dust remover is provided with cleaning means including plural jet nozzles near the inner wall of the cylindrical screen in a position of the rotary dust remover where the impurities are peeled and removed from the cylindrical screen and is provided with the flat plate scraper of which the straight-line front end approaches or abuts the external wall surface of the cylindrical screen in the position forward of the cleaning means in the rotating direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary dust remover for removing contaminants such as dust in water in sewage or water.

[0002]

2. Description of the Related Art Conventionally, in sewage treatment equipment, industrial wastewater treatment equipment, water treatment equipment, etc.
Since various kinds of dust such as paper, fibers, and wood chips are mixed, a rotary dust remover is widely used as a device for removing these dusts.

A conventional rotary dust remover is a cylindrical screen (hereinafter also simply referred to as a screen) in which a plurality of screen ring plates are arranged in the axial direction at equal intervals in a casing into which raw water flows to a predetermined liquid depth. ) Is attached to a horizontal shaft whose both ends are axially supported across the water channel in the casing, and the screen is rotated by a rotation drive device to capture impurities in the raw water at the front position of the raw water inflow side of the screen. The raw water from which the contaminants have been removed passes through the inside of the screen and is discharged from the treated water outflow side, and the separated contaminants are moved from the water surface to the position on the rear surface of the screen as the screen is rotated. The structure is such that the foreign matters captured at the position are scraped off by a comb-shaped scraper.

The comb tooth scraper is a flat plate having comb teeth at the same pitch as the screen ring plates arranged in parallel in the axial direction of the screen at equal intervals. The comb teeth of the flat plate are fitted between the screen ring plates. Generally, the shape of scraping off the contaminants captured by the screen is used, but the discs are placed side by side at the same pitch as the screen ring plate, and the discs are inserted between the screen ring plates to rotate the contaminants captured by the screen. There is also a rotating scraper that lets you scrape.

[0005]

In the conventional rotary dust remover, the comb teeth and the disc are fitted between the screen ring plates to scrape off the foreign matters captured by the screen, so that they do not come into contact with the screen ring plate. As described above, the spacing between the comb teeth and the disc of the scraper is manufactured with high accuracy, but the friction resistance increases due to the foreign substances entangled in the scraper, and if the spacing accuracy is poor, the scraper may be damaged or over torque may be generated. ,
There is a problem of breaking the roller chain that connects the screen and the rotation drive device and rotates the screen,
In particular, the problem that frictional resistance increases due to entangled foreign matters accounts for the majority of troubles in conventional rotary dust removers.

The present invention has been made in view of the above-mentioned problems of the prior art, and the scraper is damaged, over torque is generated,
Trouble such as breakage of the roller chain that rotates the screen by connecting the screen to the rotary drive can be reliably prevented, and maintenance such as scraper cleaning becomes easy, and the screen captures foreign substances with a simple structure. The purpose of the present invention is to provide a rotary dust remover capable of reliably removing dust.

[0007]

Means for Solving the Problems The gist of the present invention for achieving the above-mentioned object is, in the invention described in claim 1,
A casing into which raw water flows to a predetermined liquid depth, a shaft that is axially attached to a horizontal shaft whose both ends are axially supported across a water channel in the casing, and a cylindrical screen that is rotated by a rotation drive device is provided. In the rotary dust remover that captures impurities in the raw water at the front position of the raw water inflow side and peels and removes the contaminants captured at the rear position from the cylindrical screen, at the position where the contaminants are separated and removed from the cylindrical screen. A flat plate having a cleaning means provided with a plurality of injection nozzles in the vicinity of the inner wall of the cylindrical screen, and having a linear tip close to or in contact with the outer wall surface of the cylindrical screen at a position in front of the cleaning means in the rotation direction. A rotary dust remover characterized by being provided with a scraper.

According to the above construction, the structure in which the scraper is fitted between the screen ring plates to scrape off the contaminants captured by the screen is used, and the contaminants such as dusts caught in the screen gap are cleaned inside the screen. Contaminants that are removed by washing water or air sprayed by the means and captured on the outer periphery of the screen are removed by a flat plate scraper with a straight tip approaching or abutting, so the scraper contacts the side surface of the screen ring plate and rubs against it. The resistance does not increase. Therefore, there is no risk of damage to the scraper, generation of overtorque, and breakage of the roller chain that connects the screen and the rotation driving device to rotate the screen.

According to the second aspect of the invention,
A casing into which raw water flows to a predetermined liquid depth, a shaft that is axially attached to a horizontal shaft whose both ends are axially supported across a water channel in the casing, and a cylindrical screen that is rotated by a rotation drive device is provided. In the rotary dust remover that captures impurities in the raw water at the front surface position of the raw water inflow side and removes the contaminants captured at the rear surface position from the cylindrical screen by removing the contaminants from the cylindrical screen. Cleaning means having a plurality of injection nozzles are respectively provided near the inner wall and the outer wall of the cylindrical screen, and a linear tip is close to the outer wall surface of the cylindrical screen at a position in front of the cleaning means in the rotation direction. The rotary dust remover is characterized in that a flat plate scraper that abuts is provided.

According to the above arrangement, the scraper is not fitted between the screen ring plates to scrape off the contaminants captured by the screen, but the contaminants such as the dust trapped in the screen gaps are removed from the inside of the screen. Contaminants that have been removed by spraying cleaning water or air with the cleaning means and captured on the outer periphery of the screen are removed with a flat plate scraper whose linear tip is close to or in contact with the spraying of cleaning water or air by the cleaning means outside the screen. Therefore, the scraper does not contact the side surface of the screen ring plate to increase the friction resistance,
It is possible to reliably remove the adhered residue. Therefore, there is no risk of damage to the scraper, generation of overtorque, and breakage of the roller chain that connects the screen and the rotation driving device to rotate the screen.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a rotary dust remover according to an embodiment of the present invention.

Reference numeral 1 denotes a raw water inlet 11, a treated water outlet 12 and a trapped foreign matter outlet 13, and a screen 2 inside.
Is a casing in which the raw water is adjusted to flow into a predetermined liquid depth, and the screen 2 is axially attached to a horizontal shaft 4 whose both ends are axially supported across the water channel in the casing 1. It is rotated by the rotary drive device 5.

The screen 2 is composed of a plurality of screen ring plates 3 arranged in parallel in the axial direction at equal intervals and formed into a cylindrical shape. The contaminants are filtered and captured by the slit of a predetermined width formed on the circumferential surface, and the raw water from which the contaminants are removed is discharged from the treated water outflow side through the inside of the screen 2, and the contaminants are rotated by the screen 2. Along with the above, the structure is such that it is placed on the screen 2 and moved, and the contaminants captured at the rear surface position are peeled off.

As a structure for removing contaminants from the screen 2, a plurality of injection nozzles are provided in the captured contaminant discharge port 13 where the contaminants are removed from the screen 2 in the vicinity of the outer and inner walls of the screen 2. Cleaning means 7 and 8 are provided respectively, and a flat plate scraper 9 having a linear tip in proximity to or in contact with the outer wall surface of the screen 2 is provided at a position in front of the main cleaning means 7 and 8 in the rotation direction.

The cleaning means 8 provided near the outer wall of the screen 2 is necessary for improving the peeling cleaning effect, but it is not always necessary. Further, the foreign matter separated by the cleaning water sprayed from the cleaning means 7 provided near the inner wall of the screen 2 is the flat plate scraper 9
It is preferable to provide the shatterproof plate 10 because there is a risk of scatter if only by itself. Further, it is preferable to use cleaning water to remove contaminants from the screen 2 because of the effect of cleaning by peeling, but a gas such as air may be used.

Further, unlike the conventional rotary dust remover, the screen 2 does not have the flat plate scraper 9 in which the comb teeth are fitted between the screen ring plates, so that the screen 2 is formed by a plurality of screen ring plates 3. Alternatively, it may be formed of a perforated plate or a wire mesh having an appropriate aperture ratio.

Next, the operation of the rotary dust remover of the present invention having the above construction will be described. The raw water that has flowed from the raw water inlet 11 to a predetermined liquid depth is filtered and captured by the screen 2 that is rotated by the rotary drive device 5 through the roller chain 6, and the raw water from which the foreign substances have been removed is the screen 2.
Is discharged to the outside of the casing 1 through the treated water discharge port 12.

The contaminants captured by filtration are moved from above the water surface to the rear surface position of the screen 2 as the screen 2 rotates, and at the rear surface position, a cleaning means provided near the outer wall and the inner wall of the screen 2. It is blown away by the washing water sprayed from 7, 8 and is peeled off and washed, and is scraped off by the flat plate scraper 9 whose linear tip is close to or in contact with the outer wall surface of the screen 2, and the casing 1 is discharged from the trapped foreign matter discharge port 13. It is discharged outside. It should be noted that the foreign matters separated by the washing water are the flat plate scraper 9 and the shatterproof plate 10.
This prevents scattering and adhesion to the inner wall of the casing.

[0019]

The present invention can surely prevent troubles such as breakage of the scraper, generation of overtorque, breakage of the roller chain for rotating the screen by connecting the screen and the rotation driving device, and the scraper. This is a rotary dust remover that can easily perform cleaning such as cleaning, and has a simple structure to reliably remove trapped contaminants by the screen.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a rotary dust remover according to an embodiment of the present invention.

[Explanation of symbols]

1: Casing 2: Cylindrical screen 3: Screen ring plate 4: Horizontal axis 5: rotary drive 6: Roller chain 7, 8: Cleaning means 9: Flat plate scraper 10: Scatter prevention plate 11: Raw water inlet 12: Treated water outlet 13: Captured foreign matter discharge port

Claims (2)

[Claims] 1. A casing, into which raw water flows to a predetermined liquid depth, and a cylindrical screen, which is axially attached to a horizontal shaft having both ends axially supported across a water channel in the casing and rotated by a rotary drive device, In the rotary dust remover for capturing impurities in the raw water at the front surface position of the raw water inflow side of the cylindrical screen, and separating and removing the impurities captured at the rear surface position from the cylindrical screen, the contaminants from the cylindrical screen are removed. A cleaning means having a plurality of injection nozzles is provided in the vicinity of the inner wall of the cylindrical screen at the position where peeling and removal is performed, and a linear tip is provided on the outer wall surface of the cylindrical screen at a position in front of the cleaning means in the rotation direction. A rotary type dust remover, which is provided with a flat plate scraper that comes close to or abuts. 2. A casing, into which raw water flows to a predetermined liquid depth, and a cylindrical screen, which is axially attached to a horizontal shaft having both ends axially supported across a water channel in the casing, and which is rotated by a rotary drive device, In the rotary dust remover for capturing impurities in the raw water at the front surface position of the raw water inflow side of the cylindrical screen, and separating and removing the impurities captured at the rear surface position from the cylindrical screen, the contaminants from the cylindrical screen are removed. Cleaning means having a plurality of injection nozzles are respectively provided near the inner wall and the outer wall of the cylindrical screen at the peeling and removing position, and a straight line is formed on the outer wall surface of the cylindrical screen at a position in front of the cleaning means in the rotation direction. And a flat plate scraper whose tip ends are close to or in contact with each other.