JPH1176709A - Washer for fine screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washer for a fine screen by which the screen surface can be effectively washed even when the washer for a fine screen is installed in a facility without a washing water source. SOLUTION: A washing nozzle 24 for jetting washing water 23 supplied by a water supply pipe 22 is installed opposite to the top of a fine screen 21, and a trough 25 for housing the jetted washing water 23 and stuck material removed from the fine screen 21 by it to bring out them to outside the system is installed in a position opposite to a washing nozzle 24 with the fine screen 21 between. The water supply pipe 22 has its base end part arranged in filtered water 37 that has permeated the fine screen 21, and auto-strainers 28, 29 are inserted in the pipe 22 in series. In this way, by using the filtered water 37, the fine screen 21 can be washed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine screen cleaning apparatus attached to a fine screen used in a water treatment facility for water supply or sewage.

[0002]

2. Description of the Related Art Raw water such as clean water and sewage is mixed with various kinds of impurities of various sizes. Improving the quality of treated water and preserving the environment.

As an apparatus for removing fine suspended matters such as dust and plankton, there is, for example, a traveling fine screen (hereinafter referred to as a fine screen apparatus) shown in FIG. This fine screen device is made of stainless steel (or resin) for each link of a chain 4 suspended on a sprocket wheel 2 of a drive shaft 1 and a chain guide 3.
The endless fine screen 6 is formed by attaching a screen 5 (aperture 2 to 10 mm).
The opening 6a on one side of the fine screen 6 is installed so as to be connected to the supply port 7a in the water channel 7, and the opening 6a on the other side of the fine screen 6 is closed.

In this state, the chain 4 is run by rotating the drive shaft 1 about the center of the axis, whereby the fine screen 6 is moved in the vertical direction, and the raw water 8 is caused to flow inside the fine screen 6. hand,
Dust and the like contained in the raw water 8 are made to adhere to the fine screen 6, and clean water, that is, filtered water 9 flows out of the fine screen 6 and flows downstream.

[0005] Since the screen 5 to which dust or the like adheres rises sequentially, as shown in FIG. 3, cleaning water 11 is jetted from the cleaning nozzle 10 toward the top of the fine screen 6.
As a result, the deposits removed from the top screen 5 are led out to the treatment equipment 13 outside the water channel through the trough 12 together with the washing water 11.

[0006]

As described above, this fine screen device requires a large amount of cleaning water because it is configured to unload only with cleaning water as described above, and when the device is installed in a sewage treatment plant, As shown in the figure, the sewage secondary treatment water 14 passed through a strainer (opening 400 μm) 15 can be used as the washing water 11, but in a facility without a washing water source such as a relay pumping station for sewage and rainwater, a large amount of There is a problem that it is difficult to obtain washing water.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a fine screen cleaning apparatus capable of efficiently cleaning a screen surface even when the fine screen apparatus is installed in a facility having no cleaning water source. .

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method in which a plurality of screen members are provided and joined to a carrier chain extending over the upper and lower portions of a water channel. The screen surface is arranged in a direction along the axis of the water channel, and each screen member travels in the vertical direction as the carrier chain travels, and filters out the water to be treated supplied inside the screen surface to the outside. In configuring the fine screen cleaning device attached to the fine screen, a cleaning nozzle for spraying cleaning water supplied from a water supply pipe is provided opposite to the top of the fine screen, and faces the cleaning nozzle sandwiching the fine screen. A trough is provided at the location to contain the sprayed washing water and the deposits removed from the fine screen and lead it out of the system. , The water supply pipe, the fine screen open at proximal end to the filtration water that has passed through the one in which is interposed a plurality of strainers with different mesh in series.

Preferably, a start-up water supply pipe communicating with another washing water supply source is provided at a position upstream of the strainer of the water supply pipe via a switching valve. According to the above-described configuration, by arranging a plurality of strainers having different openings, it is possible to prevent the strainers from being clogged, and it is possible to obtain washing water having a small amount of SS. The fine screen can be cleaned using water, and the screen surface can be efficiently cleaned even when the fine screen is installed in a facility having no cleaning water source.

Since there is no filtered water available at the time of starting the fine screen, the fine screen is washed by using water from another washing water supply through a strainer. Since the time is short, water having a relatively large amount of SS may be used.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a fine screen device having a screen having an aperture of 2 to 10 mm is installed in a water channel 20. Since this fine screen device has the same configuration as the traveling fine screen described with reference to FIG. 2, illustration of the overall configuration is omitted, and only the drum-shaped fine screen 21 is illustrated and described.

The fine screen cleaning apparatus for cleaning the fine screen 21 includes a water supply pipe 22 having a base end opening in a water passage 20 on the downstream side of the fine screen 21 and led to above the fine screen 21. Cleaning water 23 attached to the top of the fine screen 21
Nozzle and a trough 25 provided at a position facing the cleaning nozzle 24 across the fine screen 21 and containing the cleaning water 23 injected from the cleaning nozzle 24 and leading the cleaning water 23 to the outside of the water channel. I have.

The water supply pipe 22 has a pump 26 and an on-off valve 27.
Auto-strainer 28 with aperture of 1-2 mm and aperture 4
A 00 μm autostrainer 29 is provided in this order from the base end side. A start-up water supply pipe 31 communicating with the tank 30 is connected to the water supply pipe 22 at a position between the on-off valve 27 and the automatic strainer 28 via an on-off valve 32.

The tank 30 stores a trough water 34 obtained by treating the washing water 23 led out by the trough 25 by a contaminant separation device in a treatment facility 33. If necessary, replenishment water such as clean water 35 is stored. Replenished. 36 is raw water, 37
Is filtered water, and 38 is a pump.

The cleaning operation in the above configuration will be described. When the operation of the fine screen apparatus is started, the on-off valve 27 is closed, and the pump 26 is stopped.
Is opened, the pump 38 is driven, the trough water 34 in the tank 30 is sent to the water supply pipe 22 through the water supply pipe 31 for startup, and the water that has passed through the auto strainers 28 and 29 is used as the cleaning water 23 as the cleaning nozzle 24. The cleaning water 23 removes the deposits attached to the screen on the top of the fine screen 21 and removes the cleaning water 2.
Then, it is dropped into the trough 25 together with 3 and is led out of the water channel and sent to the processing equipment 33.

When there is a sufficient amount of filtered water 37 downstream of the fine screen 21 such as when the operation of the fine screen device is in a steady state, the on-off valve 32 is closed, the pump 38 is stopped, and the on-off valve is stopped. 27 is opened, the pump 26 is driven, the filtered water 37 is pumped up to the water supply pipe 22, and after passing through the auto strainer 28 and the auto strainer 29, it is jetted from the washing nozzle 24 as washing water 23. The adhering matter attached to the screen at the top of the fine screen 21 is removed, dropped together with the washing water 23 into the trough 25, and led out of the water channel to the processing equipment 3.
Send to 3.

In this way, it is possible to remove the deposits on the fine screen 21 using the trough water 34 and the filtered water 37 obtained in the vicinity of the fine screen device, and to install the fine screen device in a facility without a washing water source. The fine screen 21 can be efficiently cleaned even when it is installed.

At this time, since the auto strainers 28 and 29 having different openings are arranged in two stages, even when the operation using the trough water 34 having a large amount of SS is started, the load is applied to the auto strainers 28 and 29, but the cleaning is performed. The washing water 23 can be obtained, and the filtered water 37 once passed through the fine screen 21 is used as the washing water 23 during the steady operation, so that the burden on the auto strainers 28 and 29 can be reduced.

[0019]

As described above, according to the fine screen cleaning apparatus of the present invention, the fine screen can be cleaned using the filtered water filtered by the fine screen, and the fine screen is installed in a facility having no cleaning water source. Even if it is installed, it can be washed efficiently.

At the start of a fine screen that has no filtered water available as wash water, the fine screen can be washed using water from another wash water supply.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state in which a fine screen cleaning device according to an embodiment of the present invention is provided near a fine screen device.

FIG. 2 is an explanatory view showing a state in which a conventional fine screen device is installed in a water channel.

FIG. 3 is an explanatory view showing a state in which a conventional fine screen cleaning device is provided near a fine screen device.

[Explanation of symbols]

 20 Waterway 21 Fine screen 22 Water supply pipe 23 Wash water 24 Wash nozzle 25 Trough 27 On / off valve (switching valve) 28,29 Auto strainer 30 Tank 31 Start-up water supply pipe 32 On / off valve (switching valve) 34 Trough water 35 Water supply 37 Filtered water

Claims (2)

[Claims] A plurality of screen members are provided so as to be joined to a carrier chain extending over an upper part and a lower part of a water channel, and a screen surface formed by the screen members is arranged in a direction along an axial direction of the water channel. A fine screen cleaning device attached to a fine screen for filtering the water to be treated supplied to the inside of the screen surface to the outside, wherein each screen member travels in the vertical direction as the chain travels; A cleaning nozzle for spraying the supplied cleaning water is provided opposite to the top of the fine screen, and at a position opposite to the cleaning nozzle with the fine screen interposed, the cleaning water sprayed and thereby removed from the fine screen. A trough for accommodating the adhering matter and leading out of the system is provided, and the water supply pipe has a base end in the filtered water that has passed through the fine screen. A fine screen cleaning apparatus characterized in that a plurality of strainers having openings and different openings are interposed in series. 2. The fine screen cleaning apparatus according to claim 1, wherein a starting water supply pipe connected to another cleaning water supply source is connected to a position upstream of the strainer of the water supply pipe via a switching valve. .