JPH0757285B2 - Dehydrator for liquid to be treated - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a dehydrator for separating a dispersoid in a liquid by subjecting a liquid to be treated recovered from a drain port of a filtration device to an air dehydration treatment. Regarding

<Prior Art> In a conventional air dehydrator, as shown in FIG. 2, a filtering material is stretched over the lower surface of a tank into which a liquid to be treated flows, and the filtering action is performed to perform a separation treatment. That is, a water passage plate b having water passage holes is provided on the lower bottom of the tank a, and a water passage chamber c is provided on the lower bottom of the tank so as to cover the water passage plate b. While being connected to the pipe line d, a filtering material e is stretched on the water passage plate b, and a high-viscosity liquid to be treated discharged from the drain port of the filtering device is supplied into the tank a,
The liquid to be treated is dehydrated by causing pressurized air to act on the liquid surface, permeating the filtering material e, and discharging the filtered liquid to the water passing chamber c side.

<Problems to be Solved by the Invention> By the way, in the above-mentioned conventional configuration, since the filtration separation is performed only on the bottom surface of the tank a, there is a drawback that the dehydration area is small and the efficiency is low.

In order to increase the filtration area, a water passage hole is formed from the required inner side surface to the bottom surface, and a filter medium is stretched so as to cover the water passage hole. A configuration that communicates with the liquid outlet can be considered.

However, in this configuration, when the through hole on the required inner side surface where the liquid level is lowered communicates with the inside of the tank, pressure air escapes from the liquid discharge port, the pressure in the tank is significantly reduced, and dehydration becomes impossible. Become. Therefore, such a configuration cannot be adopted.

Furthermore, even if measures are taken to prevent the air from being evacuated, the liquid level of the liquid to be treated will gradually drop with the filtration process, so that the filter medium stretched around the peripheral surface of the tank will be treated. The time it is submerged in the liquid is shorter as it goes up. In addition, as the liquid level drops, the dispersoids separated by the filter material on the peripheral surface are sequentially removed, so that a large amount of dispersoids are deposited on the bottom surface. Therefore, even if the filter material is stretched even on the inner surface of the tank to increase the filtration area,
Not only is it not effectively utilized, but the dispersoids accumulate excessively on the bottom surface, the water pressure tends to increase, and the dehydration treatment time increases.

An object of the present invention is to provide a dehydrator which does not have the above-mentioned drawbacks and has good dehydration efficiency.

<Means for Solving Problems> The present invention forms a water passage hole from a required inner side surface to a bottom surface of a tank provided with a supply port for a liquid to be treated and a pressure air supply port, A filter material is stretched so as to cover the water passage hole, the water passage hole is communicated with the liquid discharge port, and the required inner side surface is covered with a partition plate from the inside. A liquid passage having only a lower end opened is formed between them.

<Operation> When the liquid to be treated flows into the tank, it also flows into the liquid passage between the partition plate and the required inner side surface. Then, even if the liquid surface descends along with the filtration, the liquid passage is in a closed state, and the liquid to be treated in the liquid passage forms a liquid column. Then, in the liquid column, the liquid to be treated permeates through the filtering material stretched on the inner side surface, and the filtration is performed until the liquid level in the center of the tank reaches the lower end position of the partition wall. Therefore, the filtering material on the inner surface acts until the end of the dehydration treatment, and a sufficient effective filtration area can be secured.

Then, after the dehydration treatment, the dispersoids are almost uniformly deposited and adhered from the inner surface to the lower surface.

<Embodiment> An embodiment of the present invention will be described with reference to FIG.

In the figure, reference numeral 1 denotes an upper tank, and a supply port 3 for a liquid to be treated which communicates with a drain port of a filtrate and the like, and an air supply port 7 for dehydration which communicates with an air source 5 are provided in a central portion of an upper surface thereof. Has been. The supply port 3 is controlled to be opened / closed by an opening / closing valve 4, and the air supply port 7 is controlled to be opened / closed by an opening / closing valve 6.

The upper tank 1 has a funnel shape that is squeezed downward in a conical shape, and a cylindrical lower tank 8 is externally fitted to the lower opening.

The inner peripheral surface of the lower tank 8 has a bottomed water passage tubular plate 11 in which a large number of water passage holes 10 are formed from the inner side surface 11a to the bottom surface 11b.
This is further surrounded by an outer frame 12 from the outside, and a water passage chamber 13 is formed between the water passage tubular plate 11 and the outer frame 12. The outer frame 12 is formed with an outflow port 14 communicating with the water flow chamber 13, and the outflow port 14 is connected to a pipe line 16 whose opening and closing is controlled by an opening / closing valve 15.

Inside the lower tank 8, a filter net 18 and a filter cloth 19 are stretched over the entire inner surface of the water passage tubular plate 11. Then, on the inner surface 11a of the water passage tubular plate 11, a filter net 18, a filter cloth 19 and a liquid passage 20 are provided.
The partition wall plate 21 is provided around. The flange portion at the upper end of the partition plate 21 is sandwiched between the upper tank 1 and the lower tank 8, and the lower end thereof is brought close to the bottom surface 11b of the water cylinder plate 11. Thus, the lower end opening of the liquid passage 20 communicates with the inside of the tank 1.

The filtering action in this configuration will be described.

First, the on-off valve 15 is shut off, and a high-viscosity liquid to be treated, in which the alkaline earth used in the filtering device, the filter material and the like are dispersed, is supplied from the supply port 3. The liquid to be treated also flows into the liquid passage 20 and fills the passage. After the upper tank 1 and the lower tank 8 are filled with the liquid to be treated, the opening / closing valve 15 is opened, and the opening / closing valve 6 is opened so that the pressurized air from the air source 5 acts on the liquid surface f.

Due to this air, the inner surface 11 of the water passage tube plate 11 of the lower tank 8
The liquid permeates the filter mesh 18 and the filter cloth 19 stretched from a to the bottom surface 11b, and the filtration and separation are performed. Then, the liquid flows from the water passage hole 10 into the water passage chamber 13 and is discharged from the pipe line 16.

By the way, the liquid to be treated is confined in the liquid passage 20, and the liquid surface f is formed in the center of the inside of the partition plate 21 due to the dehydration treatment.
Even if the liquid drops to the position of the liquid level f ', the liquid passage
The liquid to be treated in 20 does not descend. Therefore, the liquid to be treated becomes a liquid column in the liquid passage 20, and filtration is continuously generated on the inner side surface 11a of the water passage tubular plate 11 by the action of the pressurized air.

Then, when the liquid level in the central portion exceeds the lower end of the partition plate 21, the liquid to be treated in the liquid passage 20 rapidly descends.

At the completion of this filtration process, the water passage tube plate of the lower tank 8
Dispersoids having a substantially uniform thickness are deposited from the inner side surface 11a of 11 to the bottom surface 11b.

<Effects of the Invention> As described above, the present invention is configured such that the filtering material is stretched not only on the bottom surface but also on the peripheral surface to widen the filtration area, and the inner surface of the tank is covered with the partition plate. Since the liquid column of the liquid to be treated is formed in the liquid passage between the filter medium and the filter medium and the filter medium is filtered until the liquid level of the liquid to be treated reaches the lower end position of the partition wall, the dehydration treatment time Is shortened, and there is an excellent effect that the dehydration efficiency is dramatically improved.

[Brief description of drawings]

FIG. 1 is a vertical side view of the present invention. Further, FIG. 2 is a vertical sectional side view showing a conventional configuration. 1; Upper tank, 3; Supply port, 4; Open / close valve, 5; Air source, 6; Open / close valve, 7; Air supply port, 8; Lower tank, 10; Water passage hole, 11;
Water passage tube plate, 13; Water passage chamber, 14; Outlet port, 15; Open / close valve, 16; Pipe line, 20; Liquid passage, 21; Partition plate

Claims (1)

[Claims] 1. A water passage hole is formed from a required inner side surface to a bottom surface of a tank provided with a supply port for a liquid to be treated and a pressure air supply port so as to cover the water passage hole. A liquid in which a filtering material is stretched, the water passage is communicated with the liquid discharge port, the required inner side surface is covered with a partition plate from the inside, and only the lower end is opened between the required inner side surface and the partition plate. A dehydrator for a liquid to be treated, characterized in that a passage is formed.