JPH0515923Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a precoat filtration tank used for filtering grinding fluid, cutting oil, etc., for example.

(Prior Art) Precoated filters, in which the surface of a filter element is precoated, have been widely used for filtering grinding fluid, cutting oil, and the like. Then, the stock solution such as grinding fluid discharged from the grinding machine etc. is first sent to the stock solution tank 2 of the precoat filtration tank 1 as shown in Fig. 2, and from there it is sucked into the precoat filter 3 by the pump 4. The filtrate is stored in tank 1 for pre-coat filtration.
The filtrate is sent to the filtrate tank 5.

In such a pre-coat filtration tank 1, it is preferable to maintain the liquid level in the filtrate tank 5 at a constant height, and it is necessary to prevent the stock solution in the stock tank 2 from flowing into the filtrate tank 5. For some reason,
A partition plate 6 as shown is provided in the center, and a portion of the filtrate overflows from the upper end of the partition plate 6 and flows into the stock solution tank 2.

However, if for some reason the amount of stock solution supplied from the stock solution supply pipe 7 decreases and the liquid level on the stock solution tank 2 side drops, the filtrate will fall violently from the upper end of the partition plate 6. Air bubbles may be trapped as shown in Figure 2. When the stock solution containing air bubbles is sent to the precoat filter 3, the precoat layer is destroyed and the filtration performance is reduced.

(Problems to be solved by the invention) The invention solves the above-mentioned conventional problems and prevents the entrainment of air bubbles, which causes destruction of the precoat layer, even when the amount of overflow from the upper end of the partition plate increases. The purpose of this invention is to provide a pre-coat filtration tank that is free from water pollution.

(Means for solving the problem) The above problem was solved by separating the inside of the precoat filtration tank into a stock solution tank and a filtrate tank that receives the filtrate filtered by the precoat filter by a partition plate, and overflowing the partition plate. In the precoat filtration tank in which the filtrate flows from the filtrate tank to the stock solution tank, on the stock solution tank side adjacent to the partition plate,
A flat plate whose upper end is higher than the partition plate and whose lower end reaches below the liquid level of the stock solution is provided, and further adjacent to this flat plate,
A second partition whose upper end is lower than the upper end of the partition plate and higher than the lower end of the flat plate, and whose lower end is lower than the lower end of the flat plate.
This problem is solved by a pre-coated filtration tank characterized by being provided with a flat plate.

The present invention will be explained in more detail below along with illustrated embodiments.

(Example) In FIG. 1 showing an example, 1 is a tank for precoat filtration, 2 is a stock solution tank that receives the stock solution supplied from the stock solution supply pipe 7, and 3 is a tank for sucking the stock solution in the stock solution tank 2 with a pump 4. 5 is a filtrate tank, and 6 is a partition plate separating the stock solution tank 2 from the filtrate tank 5.

The above configuration is the same as the conventional one shown in FIG. 2, and it is also the same as the conventional one that the filtrate overflows from the upper end of the partition plate 6 to the stock solution tank 2 side.

However, in the present invention, the partition plate 6 of the stock solution tank 2
A flat plate 8 is provided at a position adjacent to. This flat plate 8 is provided with a space between it and the partition plate 6 through which the filtrate can pass, and the upper end 9 of the flat plate 8 is higher than the upper end of the partition plate 6, and the lower end 10 of the flat plate 8 is higher than the upper end of the partition plate 6.
extends below the upper end of the partition plate 6 and connects the stock solution tank 2.
It is designed to reach below the liquid level of the undiluted solution. Furthermore, a second flat plate 11 is provided adjacent to this flat plate 8.
is provided. The upper end 12 of the second flat plate 11 is lower than the upper end of the partition plate 6 and higher than the lower end 10 of the flat plate 8, and the lower end 13 is lower than the lower end 10 of the flat plate 8.

(Function) The precoat filtration tank of the present invention configured as described above receives the stock solution discharged from a grinding machine or the like into the stock solution tank 2 via the stock solution supply pipe 7, and transfers this stock solution to the precoat filter by the pump 4. There is no difference from the conventional method in that the filtrate is sent to the filtrate tank 5 and a part of it overflows from the upper end of the partition plate 6 to the stock solution tank 2 side.

However, in the present invention, the above-mentioned flat plate 8 and second flat plate 11 are provided adjacent to the partition plate 6, so that the filtrate that overflows the upper end of the partition plate 6 hits this flat plate 8. Between 6〓
, and flows between the lower end 10 of the flat plate 8 and the second flat plate 11. Since the lower end 10 of the flat plate 8 is located below the surface of the stock solution, the filtrate passes through the lower end 10 of the flat plate 8 without entraining air bubbles. Furthermore, the filtrate flows upward between the flat plate 8 and the second flat plate 11 and overflows the upper end 12 of the second flat plate 11, so if the first flat plate 8 is unable to remove the air bubbles, too,
The second flat plate 11 can completely remove air bubbles.

As a result, according to the present invention, the stock solution in the stock solution tank 2 is kept free of bubbles, thereby preventing problems such as the stock solution containing air bubbles being sent to the precoat filter 3 and destroying the precoat layer. Therefore, the filtration performance of the precoat filter 3 does not deteriorate.

(Effect of the device) As is clear from the above explanation, in the present invention, by providing two flat plates on the stock solution tank side adjacent to the partition plate, the filtrate overflowing from the upper end of the partition plate flows down to the stock solution tank side. This prevents the entrainment of air bubbles during filtering, and with an extremely simple improvement, it is possible to reliably prevent the destruction of the precoat layer of the precoat filter caused by the entrainment of air bubbles.

Therefore, the present invention has extremely great practical value as a precoat filtration tank that eliminates the problems of the conventional tank.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional example. 1... Pre-coat filtration tank, 2... Stock solution tank, 3... Pre-coat filter, 5... Filtrate tank, 6
...Partition plate, 8...Flat plate, 9...Top end, 10...
Lower end, 11... Second flat plate, 12... Upper end, 13
……lower end.

Claims (1)

[Scope of utility model registration request] The inside of the precoat filtration tank 1 is separated by a partition plate 6 into a stock solution tank 2 and a filtrate tank 5 that receives the filtrate filtered by the precoat filter 3, and the filtrate that overflows the partition plate 6 is transferred from the filtrate tank 5 to the stock solution tank. 2, a flat plate 8 is provided on the side of the stock solution tank 2 adjacent to the partition plate 6, the upper end 9 of which is higher than the partition plate 6, and the lower end 10 of which reaches below the liquid level of the stock solution, Further, adjacent to this flat plate 8, a second flat plate 11 was provided whose upper end 12 was lower than the upper end of the partition plate 6 and higher than the lower end 10 of the flat plate 8, and whose lower end 13 was lower than the lower end 10 of the flat plate 8. A pre-coated filtration tank characterized by: