JPH039773Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a drum screen for removing fine dust from coarse garbage mixed with inflow water at hydroelectric power plants, drainage pump stations, sewage treatment plants, etc. The present invention relates to a fine dust remover that removes fine dust in the first stage.

[Conventional technology and its problems]

Conventionally, in hydroelectric power plants, pumping stations, sewage treatment plants, etc., if there is dirt in the inflow water that is supplied to a lift pump or power generation turbine, it will adhere to the pump or power generation turbine and impair its performance. For this reason, a fine dust remover is used to remove dust before it flows into the turbine chamber. A rotating drum screen type dust remover is used, but in this system, fine dust adheres to the drum and is removed with a scraper, or a claw is used to scrape up the dust in the inflowing water. Dust is placed on top of the drum screen and the drum screen is rotated to remove the dust. Therefore, coarse debris such as golf balls, various plastic containers, etc. will not adhere to the drum screen and will remain in the inflow tank indefinitely. For this reason, bulky waste is removed manually.

[Means for solving problems]

In view of this, the present invention provides a screen for removing coarse dust before the drum screen for removing fine dust, and after removing the coarse dust that cannot be removed by the drum screen from among the dust flowing into the dust remover. , let water flow into the inflow tank to reliably remove fine dust,
Moreover, the coarse dust is removed by being transferred from the coarse screen to the dust exhaust port on the scraper side, so that the coarse dust does not remain in the inlet tank forever.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. In the figure, reference numeral 1 denotes a casing of a fine dust remover, in which an inlet I is provided in one part and an outlet O is provided in the other part, and a drum screen 2 is rotatably provided within the casing 1. The drum screen 2 is provided with screen openings necessary to remove dust mixed in the inflow water, and mainly removes fine dust.
In addition, a middle bottom plate 3 is provided in the casing, and the upper part of the middle bottom plate 3 is an inflow tank A, and the lower part is an outflow tank B.
This inlet tank A has an inlet I, and the outflow tank B has an outlet O.
are formed respectively. The tip of this middle sole plate 3 is made to substantially touch the outer circumferential surface of the drum screen.
A coarse screen 4 is disposed within the inflow tank A and above the drum screen 1 to remove coarse debris such as golf balls and the like that cannot be removed by adhering to the outer peripheral surface of the drum with the drum screen. A coarse screen is provided so that the discharging side tip of the screen is located at the center of rotation of the drum screen or downstream from it, that is, toward the dust exhaust port. At this time, it is desirable that the tip of the coarse screen be sloped downward. A comb-shaped scraper 5 is brought into contact with a part of the outer peripheral surface of this drum screen, and the fine dust adhering to the outer peripheral surface of the drum screen is scraped off by this turbine. A port D is provided through which both coarse dirt and fine dust are discharged. Reference numeral 6 denotes partition plates provided on both sides of the drum screen so that the inflow water supplied from the inlet I is reliably guided from the inflow tank to the drum screen side.

[Effect]

Inflow water (raw water) supplied from an inlet provided in a part of the casing passes through a coarse screen at the top of the inflow tank and is led from inside the inflow tank to the drum screen. The coarse garbage caught by this coarse screen is pushed toward the drum screen by the water pressure and current of the inflowing water, rides on the surface of the rotating drum screen, and then falls naturally to the dust outlet or is scraped by a scraper. It is scraped off and removed together with fine dust adhering to the drum's outer circumferential surface. On the other hand, the inflow water that has been led to the inflow tank after removing coarse garbage passes through a drum screen, where fine dust is removed, becomes clean water, and is supplied to the pump and power generation turbine from the outlet through the outflow tank. It is something that

[Effect of idea]

When using this invention, the inflow water passes through a coarse screen before being led to the drum screen, so the coarse garbage mixed in the inflow water is forcibly separated and removed, so the removal of coarse garbage is done manually. This eliminates the need for coarse garbage to flow into the inlet tank, so there is no chance of damaging the drum screen surface.
Furthermore, since the coarse screen is provided inside the casing, there is no need to provide a separate coarse screen upstream of the fine dust remover. Further, since the tip of the coarse screen is located downstream from the center of rotation of the drum screen, there is an advantage that coarse dirt adheres to the surface of the drum screen and is reliably discharged.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view, and FIG. 2 is a side view of the same. 1 is a casing, 2 is a drum screen, 3 is a middle bottom plate, 4 is a coarse screen, 5 is a scraper,
6 is a partition plate, I is an inlet, O is an outlet, A is an inflow tank, and B is an outflow tank.

Claims (1)

[Scope of utility model registration request] A fine dust remover for removing dust mixed in inflow water using a drum screen, characterized in that a coarse screen is provided from the inlet of sewage water to the dust exhaust port side from the rotation center of the drum screen. Dust remover.