JPS5911325B2 - Cleaning method for fine dust remover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a fine dust remover in which a drum screen is forcibly rotated in a casing equipped with a scraper.
When removing dust scraped by the scraper, the drum screen is rotated in the opposite direction to clean and remove dust stuck or caught in the scraper or drum screen using the strong water pressure that flows into the casing. This article relates to a method for doing so.

Conventionally, the dust scraped by the drum screen and scraper inside the casing is discharged periodically at preset times using a timer, and the pressure is used to detect blockage of the screen by pressure difference. A method has been proposed in which a switch is provided and dust is removed based on the detection of the switch.

However, in the former case, even if the amount of garbage flowing in during heavy rain increases, the dust can only be removed periodically, so the screen is likely to become clogged with the large amount of garbage flowing in, making it impossible to operate, and in the latter case, the screen may become clogged. It will not operate unless the rate reaches 70 to 90, and if set too strictly, it will malfunction due to the normal pulsation of water pressure in the pipe. A rotating drum screen forcibly driven by a planetary gear reducer is installed in the casing, and an inlet is provided in the casing at a position facing the outer circumferential surface of the drum. In a fine dust remover that has an outlet for discharging purified water at any position on the casing,
The resistance force of the drum screen and scraper that drives the drum screegee under running water is detected by the input power of the motor for driving the drum screen, and when it is detected that the input power has exceeded the set input power, the dust exhaust valve provided in the casing is opened and the scraper is removed. At the same time, the drum screen is rotated in the opposite direction to clean the dust caught in the scraper, and when the drum screen is reversed, the strong water flow supplied from the inlet is used to remove the dust stuck to the drum screen. The main point is that they are also cleaned.

The present invention will be explained below with reference to an illustrated embodiment.

In the figure, 1 is a cylindrical casing whose size is determined to have the required dust removal ability, and a part of the outer periphery of this casing has a raw water inlet 5 and a purified water outlet 6. and a drum screen 2 inside the casing 1.
Rotate freely and insert.

Then, the shaft 3 of this drum screen is brought out of the casing and driven by a planetary gear type reducer 7 or the like.

In addition, a scraper 4 is provided inside the casing 1 so that a part of the scraper 4 is caught in the drum screen 2, and the scraper 4 scrapes off the dust etc. captured by the drum screen and is temporarily stored in the inner bottom of the casing at the lower part of the outer periphery of the drum screen. Eggplant.

The fine dust remover constructed as described above is used by being connected to the inflow side of a hydroelectric generator or other equipment.

When raw water flows into the casing through the inlet, it passes through a rotatably driven drum screen, and is then supplied to the turbine chamber of the hydroelectric generator through the outlet 6.

When the raw water passes through the drum screen, fine dust is purified and removed by the screen.

Dust and the like captured on the outer peripheral surface of the drum screen are scraped off by a scraper as the drum screen rotates, and are stored in the inner bottom of the casing.

The load of scraping off the garbage and the like captured by this scraper increases with time.

This is because the rotational resistance of the drum screen increases due to dust caught in the screen or scraper, that is, due to blockage of the drum screen.

This increase in the rotational load on the drum screen appears as an increase in the input power to the electric motor that drives the drum screen.

This increase in input power is compared with a set value, and it is detected that the input power has exceeded the set value, thereby detecting the time of dust removal and drum screen cleaning, and this is set in advance.

When it is detected that the input power increase of the electric motor has reached the set value, a dust removal command is issued, the dust removal valve installed in the casing 1 is opened, and the dust scraped and stored at the inner bottom of the casing is removed and the drum screen is removed. Rotate in the opposite direction.

Up until now, the drum screens have rotated in the same direction, so the dust caught between the scraper and the drum screen is cleaned and discharged by the reverse rotation of the drum screen and the strong water pressure from the inlet.

The opening of the dust exhaust valve and the reversal of the drum screen are set in advance using a timer, and the operation is stopped after a certain period of time has elapsed since the start of the drum screen reversal, and the dust exhaust valve is also closed, and the drum screen is rotated again. Let it rotate.

The time required for reverse rotation of this drum screen is very short.

According to the present invention, blockage of the drum screen is detected by increasing the input power, and the dust removal valve is opened and the drum screen is rotated in the reverse direction, so that the dust caught between the scraper and the drum screen is also removed. Another advantage is that the strong water flow flowing into the casing washes it away and cleaning can be done quickly and reliably.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view, and FIG. 2 is a flowchart. 1...Casing base 2...Drum screen, 3...Shaft, 4...Scraper, 5...Raw water inlet, 6... ...outlet,
7... Planetary gear type reducer.

Claims (1)

[Claims] 1 A rotary drum screen forcibly driven by a planetary gear reducer is provided in a casing equipped with a scraper, and an inlet is provided in the casing at a position facing the outer peripheral surface of the drum screen. In a fine dust remover, which consists of a drain port placed at an arbitrary position on the casing for discharging purified water, the resistance force of the scraper is used to drive the drum screen under running water. When the input power of the motor is detected and the input power exceeds the set value, the dust removal valve installed in the casing is opened to remove the dust scraped by the scraper, and the drum screen is rotated in the opposite direction to catch the scraper. A cleaning dust remover for a fine dust remover, characterized in that it cleans the dust that has entered the drum screen, and also cleans the dust that has adhered to the drum screen with a strong water flow supplied from the inlet when the drum screen is reversed. Method.