JP2000051673A - Filter apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of filtering efficiency by a boundary film by eliminating the stagnation of a fluid on the side of the object to be filtered of a membrane like filter material. SOLUTION: In a filter apparatus wherein a membrane like filter material 4 is arranged to the space formed between a pair of the impermeable support plates 1a, 1b arranged at a predetermined interval by interposing a spacer member 3 comprising an impermeable member and the object to be filtered separated by the membrane like filter material 4 is permeated through the filter membrane 4, a stirrer 2 wherein a plurality of stirring blades 2c are arranged in an up and down ladder state is arranged on the side of the object to be filtered of the membrane like filter material 4 so as to be relatively vibrated in the filter material 4 with respect to the filter material 4 and gaps C making the object to be filtered flowable are alternately provided left and right between the end parts of the stirring blades 2c and the inside wall surface 3a of the spacer member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device suitable for performing ultrafiltration (UF) or reverse osmosis filtration (RO).

[0002]

2. Description of the Related Art As a filtration device for performing ultrafiltration (UF) or reverse osmosis filtration (RO), a device as shown in FIG. 6 is known (FIG. 6A is a side view, FIG. 6B is a front view). Such a filtering device includes a pair of support plates 1a and 1b made of an impermeable member.
Further, a membrane-shaped filter medium 4 is arranged in a space formed by sandwiching an impermeable spacer 3. A sample to be filtered (filtration target) is placed in a space sandwiched between the membrane filter media 4, and in this state, the space is pressurized or the pressure is reduced from outside the membrane filter media 4. As a result, the sample permeates the membrane filter medium 4 and the filtration is performed. And
The filtrate is withdrawn from outlet 5.

[0003] However, in such a filtration device, there is a problem that a membrane is formed inside the membrane-like filter medium, and the filtration efficiency is reduced. Thus, the present inventors
In order to solve this problem, Japanese Patent Application No. 7-343658 (Japanese Patent Application Laid-Open No. 9-173791) proposes a filter of this type.

[0004] As shown in FIG.
A film-like filter medium is arranged in a space formed between a pair of impermeable support plates arranged at a predetermined interval by interposing a spacer member made of an impermeable member, and is separated by the film-like filter medium. In a filtration device that performs filtration by infiltrating an object to be filtered into the filter medium, a stirrer 2 is disposed on the filtration object side of the membrane-like filter medium, and the stirrer 2 is positioned inside the filter medium relative to the filter medium. By vibrating the membrane, it is possible to prevent a membrane from being formed on the inside of the membrane filter medium, and to prevent a decrease in filtration efficiency due to the membrane.

[0005]

SUMMARY OF THE INVENTION The present invention is a further improvement of the above-mentioned filtration apparatus, which aims to eliminate the stagnation of fluid on the filtration object side of the membrane filter medium and to improve the filtration efficiency by the membrane. Is to be able to prevent a decrease in

[0006]

In order to solve the above-mentioned problems, in a filter according to the present invention, a pair of filters arranged at a predetermined interval by interposing a spacer member made of an impermeable member. A filtration device in which a membrane-shaped filter medium is disposed in a space formed between permeable support plates, and a filtration target separated by the membrane-shaped filter medium is permeated into the filter medium to perform filtration. A stirrer in which a plurality of stirring blades are arranged in a vertical ladder shape is disposed on the side of the object to be filtered, and the stirrer is caused to vibrate relative to the filter medium in the filter medium and the agitation is performed. A gap through which the object to be filtered can flow is provided alternately between the end of the blade and the inner wall surface of the spacer member.

[0007] A filtration device according to a second aspect of the present invention is characterized in that, in the filtration device according to the first aspect, a gas is supplied to the filtration object side of the membrane filter medium.

In the above-mentioned filtration device, the stirring body preferably includes a ladder body, and the ladder body may be driven directly by attaching a drive shaft to the ladder body. It may be constituted by a body and vibrated remotely using an electromagnet (solenoid). Further, in the above-mentioned filtration device, it is preferable that the filter medium is flexible.

[0009] In the filter device according to the present invention having the above-described structure, the agitator vibrates in the filter medium so that the film on the inner wall of the filter medium can be effectively removed, thereby preventing a decrease in filtration efficiency. Will be able to In this case, when the filter medium is flexible, the filter medium fluctuates in response to the vibration of the stirrer, so that the membrane can be removed more effectively than when the filter medium is not flexible. Become.

[0010]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. 1 to 3 are views showing an embodiment of a filtration device according to the present invention. The same components as those in FIGS. 5 and 6 showing the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 3, also in a filtering device 1 according to the present invention, support plates 1a and 1b are arranged at a predetermined interval by interposing a spacer 3, and Two cloth-like filter media 4 are arranged in a space formed between the two cloth-like filter media 4 so that an object to be filtered can be put between the two cloth-like filter media 4. In the filtering device 1 according to the present invention, as a characteristic configuration, the stirring body 2 is disposed between the two cloth-like filter media 4 in which the objects to be filtered are put.

Here, in the present embodiment, the stirrer 2
Is composed of a drive shaft 2a and a ladder body 2b attached to the drive shaft 2a. When the stirrer 2 is driven up and down in the filter medium 4, the boundary film formed near the inner wall of the filter medium 4 is removed, and a decrease in filtration efficiency is prevented.

The ladder body 2b of the agitator 2 is formed in a ladder shape by holding a plurality of agitating blades 2c up and down at predetermined intervals on a drive shaft 2a, and vibrates relatively to the filter medium 4. In addition, a cutout 2d is formed at the end of the stirring blade 2c so that a gap C through which the object to be filtered can flow can be opened alternately with the inner wall surface 3a of the spacer member 3. ing. A flow path is formed in the membrane filter medium by the gap C, and an object to be filtered flows along the flow path, thereby eliminating stagnation and preventing the occurrence of a boundary film. In the figure, 2e is a reinforcing shaft. In the present embodiment, the gap C is provided by forming an oblique notch 2d at the end of the stirring blade 2c. However, the cross-sectional shape of the gap C is not limited to this, and the object to be filtered is Needless to say, the desired effect can be obtained if the shape is possible.

Further, when a gas such as air or an inert gas is supplied into the membrane filter medium, generation of a boundary film can be further prevented.

The stirring body 2 can be driven by a well-known mechanism using a motor or the like. Further, the drive shaft 2a of the agitator 2 is supported by a bearing 2f, and a known mechanism can be employed as it is as the mechanism of the bearing 2f.

In addition, as a driving mechanism of the stirring member 2, a mechanism including a combination of a magnetic body and a spring as shown in FIG. 4 can be adopted. FIG. 4A shows a configuration in which a spring 6 is attached to a ladder body 2b made of a magnetic material and the application to the solenoid 7 is repeated, so that the vibration of the stirring body 2 occurs. FIG. 4 (B) also shows the ladder body 2
b is made of a magnetic material and is caused to vibrate by a combination of a spring and a solenoid, but differs from that of FIG. 4A in that two sets of a pair of solenoids 7 are used. The spring and the solenoid may be embedded or attached to a spacer or a support plate to be integrated, or may be independent from each other.

[0017]

According to the filtering apparatus of the present invention as described above, the membrane of the filtering medium can be effectively removed, and the filtering can be performed without reducing the filtering efficiency. However, the vibration of the agitator may be relative to the filter medium. That is, as seen in US Pat. No. 3,174,622,
The same effect can be obtained by vibrating the support plate side.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a filtration device according to the present invention.

FIG. 2 is a diagram showing a configuration of a filtration device according to the present invention.
FIG. 2A is a front sectional view, and FIG. 2B is a transverse sectional view.

FIG. 3 is a diagram showing a configuration of a filtration device according to the present invention.
FIG. 3A is a side sectional view, and FIG. 3B is a front view of a ladder body shown for reference.

FIG. 4 is a view showing another embodiment of the ladder body driving mechanism.

FIG. 5 is a view for explaining a conventional filtration device. FIG. 5A is a front view, and FIG. 5B is a side sectional view of FIG.

FIG. 6 is a view for explaining a conventional filtration device. FIG. 5A is a front view, and FIG. 5B is a side sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration apparatus 1a Support plate 1b Support plate 2 Stirrer 2a Drive shaft 2b Ladder body 2c Stirrer blade 2d Notch 2e Reinforcement shaft 2f Bearing 3 Spacer 3a Inner wall surface 4 Filter material 5 Take-out 6 Spring 7 Solenoid

Claims (2)

[Claims] 1. A film-like filter medium is arranged in a space formed between a pair of impermeable support plates arranged at a predetermined interval by interposing a spacer member made of an impermeable member. A filtration device that performs filtration by impregnating the object to be filtered separated by the filter medium into the filter medium,
A stirrer in which a plurality of stirring blades are arranged in an up-and-down ladder shape is disposed on the filtration target side of the membrane-shaped filter medium, and the stirrer is caused to vibrate relatively to the filter medium in the filter medium. In addition, a filtration device is provided in which gaps through which the object to be filtered can flow are alternately provided between an end of the stirring blade and an inner wall surface of the spacer member. 2. The filtration device according to claim 1, wherein gas is supplied to the filtration object side of the membrane filter medium.