JPH05208A - Horizontal filter plate type filter - Google Patents

Abstract

(57) [Summary] [Purpose] In a horizontal filter plate type filter device of the type in which a filter material such as filter paper is horizontally held between a stock solution plate and a filtrate plate placed below the stock solution plate, the stock solution is prevented from leaking. A single packing was provided on the lower end surface of the plate, and a large tightening force was required because it was necessary to prevent leakage due to the differential pressure between the pressure inside the stock solution plate and the atmospheric pressure outside. The present invention suitably prevents the undiluted solution from leaking and reduces the tightening force. The present invention is characterized in that a pair of annular packings 16 and 17 are installed at appropriate intervals on a lower end surface of a stock solution plate, which is a surface for contacting with a filter medium, and a space 1 between the packings when tightened.
Since 8 is sealed, the air in the space becomes a pressurized gas, reducing the pressure difference between the inside and outside of the stock solution plate and preventing leakage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a horizontal filter plate type filter device of a type in which a filter material such as a filter paper is horizontally sandwiched between a stock solution plate and a filtrate plate disposed thereunder.

[0002]

2. Description of the Related Art A filter device of this type is suitable for filtering a relatively expensive liquid such as a resin liquid or a liquid which is difficult to filter, and a filter paper can be used as a filter medium. It has the feature that the filter media can be replaced automatically.

Conventionally, a horizontal filter plate type filter device shown in FIG. 3 is known. This filtration device is configured as a single-stage (single plate type) or a multi-stage type, and in each case, as shown in FIG. 3, each stage has an undiluted liquid plate 1 placed on the upper side and a filtrate placed below it. It consists of a plate 2 and a filter medium 3 held horizontally between the stock solution plate and the filtrate plate. A pipe 4 for introducing a stock solution to be filtered is connected to the stock solution plate 1, and the filtrate plate 2 is connected to the filtrate plate 2. Is connected to a pipe 5 for taking out a liquid (filtrate) filtered through the filter material 3.

The outlet end of this pipe 5 is connected to a tank 6 for temporarily storing the filtrate. In addition, a stock solution tank 7 and a pump 8 connected to the stock solution tank by a pipe are installed in association with this filtering device, and one end of the pipe 4 is connected to the discharge side of the pump. A valve 9 is installed at an appropriate position on the pipe 4. Then, a cylinder 10 is installed on the stock solution plate 1, and the cylinder plays a role of sandwiching the filter medium 3 against the filtrate plate 2 to press the stock solution plate 1 and lifting the stock solution plate 1 to release the filter medium when replacing the filter material. . Further, a tube for introducing a gas for separating the filter medium is connected to the stock solution plate.

The undiluted solution to be filtered in the undiluted solution tank 7 is introduced into the undiluted solution plate 1 through the pipe 4 by the pump 8 and is filtered by passing through the filter medium 3 set therein, and the filtrate is the filtrate plate 2 And then it is taken out by the pipe 5,
It flows into the filtrate tank 6. The filter medium 3 is placed on a conveyor having a liquid-permeable flat conveying surface, and when the filtration capacity deteriorates with the lapse of filtration time, the cylinder 10 causes the stock solution plate 1
Is lifted and gas is introduced into the stock solution plate to separate the filter medium, and the used filter medium 3 is moved and removed by the operation of the conveyor, and a new filter medium is set, and the next filtering operation is performed.

[0006]

In the conventional filtering apparatus of this type, a single packing 1a is provided on the lower end surface of the stock solution plate, which is a surface for contacting the filter medium, and is designed to prevent the stock solution from leaking. The packing had to bear a leak due to the pressure difference between the pressure inside the stock solution plate and the outside atmospheric pressure, and therefore it was necessary to apply a considerable tightening force to the cylinder 10. Therefore, it is necessary to configure the stock solution plate, the filtrate plate, and their supporting frames to have a high strength.
Also, you must use something that can withstand it,
There was a problem that it caused an increase in cost.

It is an object of the present invention to eliminate the above-mentioned problems of the prior art, and therefore, it is possible to preferably prevent the leakage of the stock solution and thereby reduce the tightening force between the stock solution plate and the filtrate plate. It is an object of the present invention to provide a horizontal filter plate type filter device that can be used.

[0008]

A horizontal filter plate type filter device according to the present invention is constructed such that a filter medium is horizontally held between a stock solution plate and a filtrate plate disposed below the stock solution plate. A pair of annular packings 16 and 17 are installed at intervals on the lower end surface of the filter material contacting surface. When the filter material is sandwiched between the filtrate plates and the stock solution plate is pressed, a space 18 between the pair of packings is formed. It is characterized by being sealed.

[0009]

Therefore, during the filtration work, when the raw liquid plate is pressed against the filtrate plate and tightened, the space 1 between the packings therebetween is
Since 8 is closed and the air in the space is pressurized, the pressure difference between the pressure in the stock solution plate and the pressure in the space between the packings is much larger than the pressure difference between the stock solution plate and the outside air. It becomes smaller and therefore the leakage from inside the stock solution plate to between the packings is weakened. Further, the pressure difference between the space between the packings and the outside air is relatively small, and therefore the leakage from the space between the packings to the outside is reduced. In this way, the liquid leakage is significantly weakened, so that the tightening force can be reduced.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the horizontal filter plate type filter device according to the present invention is also basically the same as the conventional one, the stock solution plate 1, the filtrate plate 2 arranged therebelow, and the filter medium 3 held therebetween. And these members are installed horizontally. Although the embodiment shown in FIG. 1 has a two-stage structure,
In the case of multiple stages, the piping 4 for introducing the undiluted solution to the undiluted solution plate 1 of each stage
, And a pipe 5 for taking out the filtrate are connected to the filtrate plate 2. Further, as shown in FIG. 2, a filtrate tank 6, a stock solution tank 7, a pump 8 and a cylinder 10 are provided.
If desired, the cylinder 10 may be replaced by another unit or mechanism that plays the same role. A pipe 11 in FIG. 1 introduces a gas for separating the filter medium into the stock solution plate 1 through a valve 12, 13 is a conveyer for conveying the filter medium, 14 is a shoot for removing the filter medium, and 15 is a drive of the conveyor. It is a motor.

In this horizontal filter plate type filtering device, as shown in FIG. 2, a pair of annular packings 16 and 17 are fixed to the lower end surface of the stock solution plate 1 in contact with the filter medium 3 at intervals, that is, away from each other. The space 18 between the pair of packings is sealed when the stock solution plate 1 and the filtrate plate 2 are tightened.

As is apparent from FIG. 1, the stock solution plate 1 usually has a square contour, the lower end surface of which has a square annular shape with a certain width dimension and to which the filtrate plate 2 is attached. The upper surface is also formed in an annular shape. Therefore, the pair of packings 16 and 17 are also arranged and fixed in a square annular shape along the lower end surface of the stock solution plate 1, one packing 16 is on the inner peripheral side and the other packing 17 is on the outer peripheral side than that. The spacing between the packings may be any suitable value, for example a few cm. The spacing between the packings is preferably the same on each side of the annular shape.

The pair of packings are preferably constructed to have the same cross-sectional shape, and the cross-sectional shape may be arbitrary. However, in the case of a square cross-section, the dimension of one side is about 6 to 12 mm in one example. It has a shape. These packings are usually made of a material such as Teflon, polypropylene, vinyl chloride, etc., each of which is fitted into a groove formed along the lower end surface of the stock solution plate 1 and fixed with an adhesive or the like. To be done.

When the stock solution plate 1 is sandwiched by the cylinder 10 against the filter medium 3 and pressed against the filtrate plate 2 below the space, a space between the pair of packings 16 and 17, more specifically, the lower end surface of the stock solution plate 1 and the filtrate plate 2. An annular space 18, which is located between the pair of packings and is located between the filter material 3 on the upper surface, is sealed, so that when the space 18 is compressed by pressing by the cylinder 10, the air therein is pressurized. To be done. The pressure P2 in the space is configured to be lower than the pressure P1 in the stock solution plate at the time of filtration work. Therefore, if the atmospheric pressure is P0, P2
The relationship of 1>P2> P0 is established.

When the stock solution is filtered, the stock solution plate 1 is pressed against the filtrate plate 2 by the cylinder 10 and the space between them is tightened, so that the space 18 between the packings is compressed at a compression rate of about 1.2 to 2.0. The air in the space is pressurized and the above relationship is established. In such a state, the stock solution is introduced into the stock solution plate 1 by the operation of the pump 8 to carry out filtration. Therefore,
The pressure difference between the pressure in the stock solution plate and the pressure in the space between the packings (P
1-P2) is the differential pressure (P1-
Since it is smaller than P0), leakage from the stock solution plate to the space 18 between the packings is weakened. Further, the pressure difference (P2-P0) between the pressure in the space 18 between the packings and the atmospheric pressure is also smaller than the pressure difference (P1-P0) between the pressure in the stock solution plate and the atmospheric pressure, and leakage between them is also reduced. .

Since the differential pressure is small as described above, it is possible to prevent the undiluted solution in the undiluted solution plate from leaking into the space 18 between the packings. So it will be reduced. Thus, the differential pressure is reduced and the sealing is performed in two steps, so that almost no leakage occurs. Also, since the leakage can be weakened, the tightening force can be reduced, and the degree of reduction depends on the packing material,
Although it depends on the liquid properties of the stock solution and the filtration pressure, it can be reduced by at least about 10% (in one example, 10 t).

[0017]

As described above, according to the present invention, a pair of packings is provided between the stock solution plate and the filtrate plate, and the differential pressure between the spaces partitioned by these packings is reduced to prevent leakage. Since it significantly weakens, leakage of the stock solution can be preferably prevented. Therefore, it is also possible to reduce the tightening force between the stock solution plate and the filtrate plate, thereby reducing the required strength of the packing, the stock solution plate and the filtrate plate, and their supporting frames, which contributes to cost reduction. To do.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a horizontal filter plate type filter device to which the present invention is related.

FIG. 2 is a cross-sectional view showing a main part of a filtering device according to an example of the present invention.

FIG. 3 is a cross-sectional view showing a conventional horizontal filter plate type filter device.

[Explanation of symbols]

 1 undiluted liquid plate 2 filtrate plate 3 filter material 16 packing 17 packing 18 space between packings

Claims (1)

Claim: What is claimed is: 1. An undiluted liquid plate, a filtrate plate disposed below the undiluted liquid plate, and a filter medium horizontally held between them. The undiluted liquid introduced into the undiluted liquid plate is filtered by the filter medium. In a horizontal filter plate type filtration device taken out from the filtrate plate, a pair of annular packings are fixed at a lower end surface of the stock solution plate at intervals, and the filter plate is sandwiched between the filtrate plate and the stock solution plate. A horizontal filter plate type filtering device, wherein a space between the pair of packings is closed by pressing the air so that the air in the space is pressurized.