JP4006662B2 - Filtration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filtration apparatus suitable for performing ultrafiltration (UF) and reverse osmosis filtration (RO).
[0002]
[Prior art]
As a filtration device for performing ultrafiltration (UF) and reverse osmosis filtration (RO), a device as shown in FIG. 6 is known (FIG. 6 (A) is a side view and FIG. 6 (B). Is a front view). Such a filtration apparatus is configured by arranging a membrane-like filter medium 4 in a space formed by sandwiching a non-permeable spacer 3 between a pair of support plates 1a and 1b made of an impermeable member. ing. A sample to be filtered (filtered object) is placed in a space sandwiched between the membrane-like filter media 4, and in this state, the space is pressurized or the pressure is reduced from the outside across the membrane-like filter media 4. As a result, the sample permeates the membrane filter medium 4 and the filtration is performed. Then, the filtrate is taken out from the outlet 5.
[0003]
However, in such a filtration device, there is a problem in that a boundary film is formed inside the membrane filter medium and the filtration efficiency is lowered. In order to solve this problem, the present inventors have proposed this type of filtration device with Japanese Patent Application No. 7-343658 (Japanese Patent Laid-Open No. 9-173791).
[0004]
As shown in FIG. 5, the filtration device described above has a film-like shape 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. In a filtration device that performs filtration by placing a filter medium and permeating the filtration object separated by the membrane filter medium into the filter medium, the stirring body 2 is disposed on the filtration object side of the membrane filter medium, and the stirring By vibrating the body 2 relative to the filter medium in the filter medium, it is possible to prevent a boundary film from being generated inside the membrane filter medium and to prevent a decrease in filtration efficiency due to the boundary film. is there.
[0005]
[Problems to be solved by the invention]
The present invention is a further improvement of the above filtration device, and its purpose is to eliminate the stagnation of the fluid on the filtration object side of the membrane filter medium and to prevent the reduction of the filtration efficiency due to the boundary membrane. It is in.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in the filtration device according to the present invention, 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 disposing a membrane-like filter medium and allowing the filtration object separated by the membrane-like filter medium to permeate the filter medium, and a plurality of filtration objects on the filtration object side of the membrane-like filter medium An agitating body in which stirring blades are arranged in the form of an upper and lower ladder is arranged, and this agitating body is caused to vibrate relative to the filter medium in the filter medium, and the end of the stirring blade and the spacer member Between the inner wall surfaces, gaps through which the filtration object can flow are provided alternately on the left and right.
[0007]
Moreover, the filtration apparatus which concerns on Claim 2 of this invention is a filtration apparatus of Claim 1. WHEREIN: Gas is supplied to the filtration target object side of a membranous filter medium, It is characterized by the above-mentioned.
[0008]
In the above filtration device, the stirrer preferably includes a ladder body, and the ladder body may be driven directly by attaching a drive shaft to the ladder body, and the ladder body is made of a magnetic body. Then, it may be vibrated remotely using an electromagnet (solenoid). In the above filtering device, the filter medium is preferably flexible.
[0009]
In the filtration apparatus according to the present invention having the above-described configuration, the boundary film on the inner wall of the filter medium can be effectively removed by virtue of the stirring body vibrating in the filter medium, thereby preventing a decrease in filtration efficiency. become able to. In this case, when the filter medium is flexible, the filter medium swings in response to the vibration of the stirring body, so that the film can be removed more effectively than when the filter medium is not flexible. Become.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.
1 to 3 are diagrams showing an embodiment of a filtration device according to the present invention. The same components as those in the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals, and the description thereof is omitted.
【Example】
As shown in FIGS. 1 to 3, also in the filtration device 1 according to the present invention, the support plates 1a and 1b are arranged with a predetermined interval through the spacer 3, and are formed between the support plates. Two cloth-like filter media 4 are arranged in the space, and an object to be filtered is placed between the two cloth-like filter media 4. In the filtration device 1 according to the present invention, as a characteristic configuration, a stirring body 2 is disposed between two cloth-like filter media 4 into which an object to be filtered is placed.
[0012]
Here, in this embodiment, the agitator 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 in the vicinity of the inner wall of the filter medium 4 is removed, and a decrease in filtration efficiency is prevented.
[0013]
The ladder body 2b of the stirring body 2 is configured in a ladder shape by holding a plurality of stirring blades 2c vertically on the drive shaft 2a with a predetermined interval, and is configured to vibrate relative to the filter medium 4. In addition, a notch 2d is formed at the end of the stirring blade 2c so that gaps C through which the filtration object can flow can be alternately opened between the inner wall surface 3a of the spacer member 3. A flow path is formed in the membranous filter medium by the gap C, and an object to be filtered flows along the flow path, thereby eliminating the stagnation and preventing the generation of a boundary film. In the figure, 2e is a reinforcing shaft.
In the present embodiment, the gap C is provided by forming the oblique notch 2d at the end of the stirring blade 2c, but the cross-sectional shape of the gap C is not limited to this, and the object to be filtered flows. It goes without saying that the desired effect can be obtained if the shape is possible.
[0014]
In addition, when a gas such as air or an inert gas is supplied into the membrane filter medium, the generation of a boundary film can be further prevented.
[0015]
The stirrer 2 can be driven by a generally well-known mechanism using a motor or the like. The drive shaft 2a of the agitator 2 is supported by a bearing 2f, but a known mechanism can be used as it is.
[0016]
In addition to this, as the driving mechanism of the stirring member 2, a mechanism composed of a combination of a magnetic body and a spring as shown in FIG. 4 can be adopted. In FIG. 4A, 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 vibration of the stirring body 2 occurs. FIG. 4 (B) also shows that the ladder 2b is made of a magnetic material and vibration is generated by a combination of a spring and a solenoid. However, FIG. 4 (A) shows that two pairs of solenoids 7 are used. ) Is different. The spring and solenoid may be integrated by being embedded or attached to a spacer or a support plate, or may be independent of each other.
[0017]
【The invention's effect】
According to the filtration device according to the present invention as described above, the boundary film of the filter medium can be effectively removed, and filtration can be performed without reducing the filtration efficiency. However, the vibration of the stirrer only needs to be relative to the filter medium. That is, as seen in US Pat. No. 3,174,622, the same effect can be obtained even if the support plate side is vibrated.
[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. 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. 3A is a side cross-sectional view, and FIG. 3B is a front view of a ladder body shown for reference.
FIG. 4 is a diagram showing another aspect of the ladder drive mechanism.
FIG. 5 is a diagram for explaining a conventional filtration device. FIG. 5A is a front view, and FIG. 5B is a side cross-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 cross-sectional view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration apparatus 1a Support plate 1b Support plate 2 Stirring body 2a Drive shaft 2b Ladder body 2c Stirring blade 2d Notch 2e Reinforcement shaft 2f Bearing 3 Spacer 3a Inner wall surface 4 Filter medium 5 Outlet 6 Spring 7 Solenoid

Claims (2)

A membrane-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 separated by this membrane-like filter medium. A filtration device that performs filtration by infiltrating a filtration object into the filter medium, wherein a stirring body in which a plurality of stirring blades are arranged in the form of an upper and lower ladder is disposed on the filtration object side of the membrane filter medium. The body is configured to vibrate relative to the filter medium in the filter medium, and a gap through which the filtration object can flow is left and right between the end of the stirring blade and the inner wall surface of the spacer member. A filtration device characterized by being provided alternately. 2. The filtration device according to claim 1, wherein gas is supplied to the filtration object side of the membrane filter medium.

Images