JPS5811271B2 - Scum removal device on liquid surface - Google Patents

Description

[Detailed Description of the Invention] This invention is a scum removal device used in sedimentation ponds where there is a constant difference in water level, and is intended to capture grease, oil, and other scum floating on the water surface by overflow. be.

The problem with this type of device is that when the scum taken into the trough is sucked in by a pump and pulled out to the outside, the flow rate of the liquid introduced into the trough beyond the overflow point and the amount of suction by the pump If the water level is too low, the level of the overflow part relative to the liquid level will rise and fall, making continuous and effective capture of scum impossible.

This invention was made based on the above-mentioned circumstances, and even if the amount of suction by the pump increases beyond the flow rate of the liquid introduced into the trough beyond the overflow part, it suppresses the floating of the trough and maintains a predetermined level. The aim is to provide a device that can secure an overflow amount of scum and perform continuous and stable scum removal.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, reference numeral 1 denotes an elongated trough shaped like a gutter. Guide wheels 2 are attached to both ends of the core trough 1, and the core trough 1 is guided up and down by vertical rails 4 arranged along the inner wall 3 of the storage tank. It looks like this.

A girder 5 extends over this trough 1, and floats 6 are attached to this girder 5.

Further, the trough 1 is formed with notches and liquid overflow portions 7 at predetermined intervals in its longitudinal direction.

A liquid bed 8 is provided in the trough 1 at a location slightly lower than the overflow portion 7, and a hose 10 connected to a pump 9 is communicated with the center of the trough 1.

In addition, near both sides of the trough 10, the liquid bed 8
The liquid guides 11 and 11 communicating with the lower space of the trough 1
It has an opening at the bottom.

With such a configuration, the scum removal device can float the trough 1 up and down as the liquid level (water level) in the leaf/tank rises and falls.

When the scum floating on the liquid crosses the overflow part 7 and flows into the trough together with the liquid, it flows on the liquid bed 8 and is sucked into the hose 10 where the suction force is exerted by the pump 9, and is released to the outside. removed.

In this case, it is good when the amount of overflow liquid containing scum and the amount of suction by the pump are balanced, but when the amount of pump suction is greater, the amount of liquid on trough 1 decreases and trough 1 floats. , the difference between the top of the overflow portion 7 and the liquid level becomes smaller, and there is a risk that the amount of overflow liquid will be further reduced.

Also, in this invention, the trough 1 has a space below the liquid bed, and the liquid is always allowed to enter there through the liquid introduction ports 11, 11, so the amount of liquid on the liquid bed 8 decreases. In order to introduce liquid into the bottom of trough 1 as much as possible, trough 1 as a whole
will have a constant load, and the difference between the overflow portion 7 and the liquid level will be maintained constant.

Therefore, there is no problem that the pump 9 sucks only air, and a continuous and stable scum removal effect can be achieved.

In addition, the reference numeral 12 in the figure is a scum scraping stand installed between both side edges of the storage tank, which is movable in the longitudinal direction of the storage tank.
A scraping plate 13 is attached below this pedestal 12, and the operation of the pedestal 12 serves to scrape up the scum toward the trough 1 on the liquid surface.

In this embodiment, the pump and the trough communicate with each other at one place, but if the length of the trough is extremely long, the number of places where the pump communicates with the trough may be increased to a plurality of places.

However, in order to adjust the flow rate beyond the overflow part, a structure may be adopted in which the width of the overflow part can be adjusted.

As described above, according to the present invention, even if the suction amount of the pump and the flow rate of the liquid containing scum flowing into the trough from the overflow part are not balanced, the floating of the trough can be suppressed and the inflow amount of scum can be stabilized. can be maintained and continuous removal of scum can be effectively achieved.

Furthermore, this scum removal device does not require complicated electrical control, and has a simple structure because it simply requires a liquid flow bed and a liquid guide port.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a view taken along the line I-■ in FIG.
The figure is a sectional view taken along the line ■-■ in Fig. 2, Fig. 5 is a sectional view taken along the line X-X in Fig. 2, Fig. 6 is a schematic plan view of the entire storage tank, and Fig. 7 is a schematic longitudinal section thereof. FIG. 1...Trough, 2...Guide wheel, 3...Inner wall, 4...
Rail, 5...Girder, 6...Float, 7...Overflow part, 8
...Liquid bed, 9...Pump, 10...Hose, 11...
Liquid guide port, 12... mount, 13... scraping board.

Claims (1)

[Claims] 1 An overflow part is formed for a trough supported above the liquid surface at the chamber level by a float, a liquid bed slightly lower than the groove part is provided in the trough, and the liquid on the liquid bed is sucked. A pump for removing scum above the liquid surface is connected to the trough, and a liquid introduction port for introducing the liquid into the trough below the Juko liquid flow bed is provided at the bottom of the trough.