JP3550454B2 - Filtration device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filtration device suitable for performing ultrafiltration (UF) or reverse osmosis filtration (RO).
[0002]
[Prior art]
As a filtration device for performing ultrafiltration (UF) or reverse osmosis filtration (RO), a device as shown in FIG. 4 is known (FIG. 4 (A) is a side view and FIG. 4 (B) Is a front view). Such a filtering device is configured such that a membrane-like filter medium 14 is disposed in a space formed by sandwiching a similarly impermeable spacer 13 between a pair of support plates 11a and 11b made of an impermeable member. Have been. A sample to be filtered (object to be filtered) is placed in a space interposed between the membrane filter media 14, and in this state, the space is pressurized or the pressure is reduced from outside through the membrane filter media 14. As a result, the sample permeates the membrane filter medium 14, and the filtration is performed. Then, the filtrate is taken out from the outlet 12.
[0003]
[Problems to be solved by the invention]
However, even 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 (Japanese Patent Application No. 6-242836).
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to prevent a reduction in filtration efficiency due to a membrane even in the above-described filtration device.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, in the filtration device according to the present invention, the filtration device is formed between a pair of impermeable support plates arranged at a predetermined interval by interposing a spacer member formed of an impermeable member. In a filtration device that arranges a membrane-shaped filter medium in the space formed and performs filtration by permeating the filtration object separated in the membrane-shaped filtration medium into the filtration medium, the filtration object side of the membrane-shaped filtration medium is A stirrer is provided, and the stirrer vibrates in the filter medium relative to the filter medium.
[0006]
In the filtration device, the stirring body preferably includes a ladder body, and the driving of the ladder body may be performed directly by attaching a drive shaft to the ladder body, and the ladder body is made of a magnetic material. Alternatively, the device may be remotely vibrated using an electromagnet (solenoid). Further, in the above filtering device, it is preferable that the filter medium is flexible.
[0007]
In the filtration device according to the present invention having the above-described configuration, the stirring member vibrates in the filter medium, whereby the film on the inner wall of the filter medium can be effectively removed, and a decrease in filtration efficiency can be prevented. become able to. In this case, when the filter medium is flexible, the filter medium swings in response to the vibration of the agitator, so that the membrane can be more effectively removed than when the filter medium is not flexible. become.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 are views showing an embodiment of a filtration device according to the present invention. The same components as those in FIG. 4 showing the conventional example are denoted by the same reference numerals, and description thereof will be omitted.
[0009]
As shown in FIG. 1 (A), also in the filtering device 20 according to the present invention, the support plates 11a and 11b are arranged at a predetermined interval by interposing the spacer 13, so that the support plate 11a is formed between the support plates. Two cloth-like filter media 14 are arranged in the space thus set, and an object to be filtered is put between the two cloth-like filter media 14. However, in the filtering device 20 according to the present invention, as a characteristic configuration, the stirrer 21 is disposed between the two cloth-like filter media 14 in which the objects to be filtered are put.
[0010]
Here, in the embodiment of the present invention, the stirrer 21 includes a drive shaft 21a and a ladder body 21b attached to the drive shaft 21a. When the stirrer 21 is driven up and down in the filter medium 14, the boundary film formed near the inner wall of the filter medium 14 is removed, and a decrease in filtration efficiency is prevented.
[0011]
Driving of the stirring body 21 can be performed by a well-known mechanism using a motor or the like. Further, the drive shaft 21a of the stirring body 21 is supported by a bearing 23, and a known mechanism can be adopted as the mechanism of the bearing 23 as it is.
[0012]
In addition, as a driving mechanism of the stirring body 21, a mechanism including a combination of a magnetic body and a spring as shown in FIG. 3 can be adopted. FIG. 3A shows a configuration in which a spring 21c is attached to a ladder body 21b made of a magnetic material, and the application of a voltage to a solenoid 21d is repeated, so that the stirring body 21 vibrates. FIG. 3B also shows that the ladder body 21b is made of a magnetic material and vibration is generated by a combination of a spring and a solenoid. However, FIG. 3A shows that two pairs of solenoids 21e are used. A) different from those. The spring and the solenoid may be embedded or attached to the spacer or the support plate to be integrated, or may be independent from each other.
[0013]
According to the filtering device of the present embodiment as described above, the membrane of the filter medium 14 can be effectively removed, and the filtration can be performed without lowering the filtration efficiency. However, the vibration of the stirrer 21 may be any relative to the filter medium 14. That is, as shown in U.S. Pat. No. 3,174,622, a similar effect can be obtained by vibrating the support plates 11a and 11b.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a filtration device according to an embodiment of the present invention. 1A is a front view, and FIG. 1B is a front view of a ladder body shown for reference.
FIG. 2 is a diagram showing a configuration of a filtration device according to an embodiment of the present invention. FIG. 2A is a side sectional view of FIG. FIG. 2B is a front view of the ladder body shown for reference.
FIG. 3 is a view showing another embodiment of the ladder body driving mechanism.
FIG. 4 is a view for explaining a conventional filtration device. 4A is a front view, and FIG. 4B is a side sectional view of FIG. 4A.
[Explanation of symbols]
11a, 11b support plate, 13 spacer (spacer member), 14 filter medium, 20 filtration device, 21 stirrer, 21a drive shaft, 21b ladder body.

Claims (1)

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 is separated by the membrane-like filter medium. In a filtration device that performs filtration by impregnating the object to be filtered with the filter medium,
A filtering device, wherein a stirrer is disposed on the filtration object side of the membrane-like filter medium, and the stirrer vibrates relatively to the filter medium in the filter medium.

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