JPH10216422A - Filtration device and filtration method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform agitation simultaneously with filtration and to always expose a filter medium to a flow of object liquid. SOLUTION: This filtration device is provided with a drive pipe 10, a filter 20 provided projectingly sideways from the pipe 10, and a motor 30 for subjecting rotary driving to the pipe 10. On the side of a bottom part 11 of the pipe 10, a branch pipe 13 is provided, and communication with the filter 20 is secured by the branch pipe 13. The filter 20 is immersed in object liquid 50 and is formed by fitting rubber plugs 22 in a porous ceramic pipe 21 at both the ends thereof. The motor 30 and an open end 12 are housed in a housing 32 having a filtrate outlet 32a connected to a pressure reducing pump. In the open end 12, a filtrate discharge port 32 is made, and above and below the discharge port 12a is pierced, shaft seals 14 are fitted to secure sealability of the inside of the drive pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention has a stirring function,
The present invention also relates to a filtration device and a filtration method capable of performing filtration while preventing clogging of a filter medium.

[0002]

2. Description of the Related Art Hitherto, in order to prevent clogging of a filter medium, an apparatus for filtering while rotating the filter medium has been put into practical use. As an example of such a filter apparatus, a cylindrical ceramic pipe which is a filter medium is rotated. A device for filtering a target liquid by exhausting the inside of a pipe while causing the pipe to exhaust is known. Further, as another example, a device in which a plurality of disc-shaped filter media are fixed vertically and in multiple stages to a rotating shaft made of a pipe, the pipe is rotated while exhausting the inside, and the filtrate is collected and extracted in the pipe. It has been known.

[0003]

However, in such a conventional filter device, in a device for rotating a ceramic pipe, in order to increase the filtration area, the diameter or length of the pipe must be increased. However, there is a problem that a sufficient filtration area cannot be secured for the volume. In addition, the liquid to be filtered is often stirred, but it is necessary to prepare a separate stirrer, and when the volume or the mounting area is limited as in a small cultivation apparatus, the liquid may not be attached. .

[0004] On the other hand, in an apparatus in which a disc filter medium is fixed in multiple stages, the liquid interposed between the filter media does not substantially flow, so that the liquid is fixed between the filter media. Although the baffle plate is arranged, a plurality of the device units having the above configuration are arranged so that the installation positions of the disc-shaped filter media are alternately arranged, and the flow of the target liquid is applied to the filter media surface. There has been a problem that the apparatus becomes complicated or large as a whole.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to stir simultaneously with filtration and to keep the filter medium constantly in the flow of the target liquid. An object of the present invention is to provide a filter device and a filter method which can be exposed.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that the above problems can be solved by sharing a filtrate flow path and a drive shaft. The present invention has been completed.

That is, a filtration device of the present invention comprises a bottomed cylindrical drive shaft, a filter connected to the bottom side from the open end of the drive shaft, a pressure reducing means for reducing the pressure in the drive shaft, Driving means for driving the shaft, wherein the filter has a filter medium, is protruded from a side of the driving shaft, and has a stirring function.

The filtering method of the present invention is also directed to a filtration method having a filter medium and a stirring function which is communicated with a bottomed cylindrical drive shaft by projecting laterally from a position on the bottom side from the open end of the drive shaft. Filter, a filtering method using a filtering device comprising a driving means for driving the drive shaft, wherein the filter is immersed in a target liquid to drive the drive shaft, the inside of the drive shaft The pressure is reduced or the target liquid is pressurized, or the pressure inside the drive shaft is reduced and the target liquid is pressurized.

[0009]

In the present invention, a drive shaft and a cylindrical filtrate flow passage for extracting and collecting the filtrate are also used, and the drive shaft is provided with a filter which constitutes a part of the filtrate flow passage and has a stirring function. Communicated. Therefore, by driving the drive shaft, the target liquid can be stirred by the filter itself, and at the same time, the filter medium can be exposed to the flow of the target liquid. That is,
By driving the bottomed cylindrical drive shaft, the flow of the target liquid can be imparted to the filter medium provided in the filter at the same time as the target liquid is stirred, and the clogging of the filter medium can be reliably prevented and the filtration can be performed. Performance can be greatly improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a filtration device and a filtration method of the present invention will be described in detail. As described above, the filtration device of the present invention includes a bottomed cylindrical drive shaft, a filter having a stirring function, a pressure reducing unit, and a driving unit. Here, the bottomed cylindrical drive shaft is not particularly limited, and a pipe whose one end is closed can usually be used. Specifically, the bottom side is used with the bottom side immersed in the target liquid.

[0011] The driving form of the drive shaft includes a rotary motion rotating around the center axis of the cylinder, a vertical motion reciprocating in the center axis direction, and a side reciprocating left and right while maintaining the direction of the center axis. A reciprocating motion and a swing motion rotating at a fixed central angle about a central axis can be exemplified, and these motions can be arbitrarily combined. Furthermore, it is possible to combine with a pendulum motion in which one end of the cylinder is fixed, and as the driving means, various mechanisms, motors, and the like are used as long as the above-described various motions of the drive shaft can be realized. be able to.

Next, the filter is not particularly limited as long as it has a filter medium and is in communication with the drive shaft so that gas and liquid can freely flow between the filter and the drive shaft. However, it is necessary to protrude laterally from the axial direction of the drive shaft to secure the filter medium area, and the installation position is the bottom side from the open end of the drive shaft, specifically, the target liquid It is necessary to be located at a position where it is immersed in the container, and it is preferable to be near the bottom which is a closed end.

The number of the filters can be not only one but also a plurality, and can be appropriately changed depending on the drive form of the drive shaft. Filters project symmetrically with respect to the drive shaft. That is, when a drive shaft is observed from the axial direction and a circle centered on the drive shaft is assumed, a plurality of filters have a radius from the center (drive shaft). It is advantageous from the standpoint of stirring efficiency to have a configuration in which a predetermined length is radially extended at an equal angle in the direction.

Although the shape of the filter can be appropriately changed depending on the drive form of the drive shaft, it is preferable to take a shape that is opposed to the direction of movement of the drive shaft in consideration of stirring efficiency. In the case of the swinging motion, the shape can be an oval shape or a flat plate shape with a flat surface directed in the rotation direction.

When the drive shaft similarly rotates or swings, the shape of the filter is substantially donut-shaped or wheel-shaped, and the drive shaft is erected at the center of the hole, and is attached to the arm of the wheel. A configuration in which communication with the bottomed cylindrical drive shaft is ensured at a corresponding portion can be given. According to such a configuration,
Since the target liquid flows through the donut-shaped or wheel-shaped holes, the stirring efficiency can be improved, and this is particularly effective when such a wheel-shaped filter is provided in multiple stages with respect to the drive shaft.

Further, the above-mentioned filter has a filter medium, and the material of the filter medium can be appropriately changed according to the properties of the target liquid, the particle size of the dispersant to be filtered and the properties of the dispersion medium. it can. Generally, a porous material that can pass through the dispersion medium, for example, a water-permeable or oil-permeable ceramic, a resin, and paper can be exemplified.

Furthermore, the filter medium can constitute the whole or a part of the filter, but if it constitutes a part, the place where the flow of the target liquid is sufficiently given to improve the filtration efficiency is provided. It is desirable to configure. For example, when the filter is oar-shaped or feather-plate-shaped, it is preferable that the filter medium constitutes one or both flat surfaces. Preferably, the filter medium is formed in a donut plate shape or a wheel plate shape.

The depressurizing means is not particularly limited as long as the inside of the cylindrical drive shaft can be depressurized and the filtrate can be drawn into the drive shaft, and various decompression pumps can be used. Further, the connection portion with the drive shaft may be any portion as long as it is on the open end side from the bottom.

Further, in the present invention, instead of the above-mentioned decompression means, a structure capable of pressurizing the target liquid can be adopted. For example, the target liquid is sealed in a container, and a pump is provided in the container. Filtration can also be performed by driving the drive shaft while pressure-feeding various gases.

In the present invention, as described above, the filter itself is used as the stirring element. In addition to this, a dedicated stirring blade is attached to the drive shaft to further improve the filtering / stirring performance. Can be done. As such a stirring blade, a turbine, a marine, a disk turbine and other various stirring blades can be used.

For example, as described above, when donut-shaped or wheel-shaped filters are arranged in multiple stages with respect to the drive shaft, when stirring blades such as turbine blades and marine blades are arranged between the filters,
Since the target liquid easily flows through the holes of the donut or the wheel, and the filter does not hinder the stirring, the filtering / stirring performance can be further improved, which is preferable. However, if the donut-shaped or wheel-shaped filter is arranged obliquely with respect to the axial direction of the drive shaft and fixed, the stirring ability of the filter itself is improved.
In particular, sufficient stirring can be performed without disposing a stirring blade, and the flow of the target fluid can be sufficiently imparted to the surface of the filter medium, which is effective for preventing or reducing clogging of the filter medium.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view showing an embodiment of the filtration device of the present invention. Referring to FIG. 1, the filter device includes a drive pipe 10 as an example of a bottomed cylindrical drive shaft, a filter 20 protruding laterally from the axial direction of the pipe 10, and a motor for driving the pipe 10 to rotate. 30.

On the bottom 11 side of the drive pipe 10, branch pipes 13, 13 are provided, and communication with the filter 20 is secured through the branch pipe 13. Filter 2
Numeral 0 is immersed in the target liquid 50, is constituted by inserting a rubber stopper 22 into the tip of a porous ceramic pipe 21 which is an example of a filter medium, and passes through a sealing rubber tube 23 mounted inside the base end. And is attached to the branch pipe 13. In addition,
In the present embodiment, a disk turbine 40, which is an example of a stirring blade, is attached to the bottom 11 of the pipe, thereby improving the stirring ability of the filtration device with respect to the target liquid 50.

On the other hand, the open end 12 of the pipe 10 is connected to the motor 30 by a fixture 31.
The open end 12 of the pipe 10 is connected to a housing 3 having a filtrate outlet 32a connected to a pressure reducing pump (not shown).
2 housed. Also, the filtrate outlet 32 of the open end 12
The filtrate outlet 12a is bored at a position corresponding to.
A shaft seal 14 is attached between the drive pipe 10 and the inside of the drive pipe 10 to secure the hermeticity.

Next, the operation of this embodiment will be described.
When the stirrer 20 is immersed in the target liquid 50 and the inside of the pipe 10 is exhausted by the vacuum pump through the filtrate outlet 32 a while rotating the drive pipe 10 by the motor 30, the liquid 50 is stirred by the filter 20 and the disc turbine 40. However, at the same time, the flow of the liquid 50 is provided in the vicinity of the ceramic pipe 21, so that the clogging of the ceramic pipe 21, which is a filter medium, is reduced when the liquid 50 is filtered.

Then, since the inside of the pipe 10 is evacuated, the filtrate filtered from the target liquid 50 is introduced into the branch pipe 13 through the ceramic pipe 21, and this filtrate is supplied to the branch pipe 13 and the inside of the pipe 10. , Filtrate discharge hole 12a
And the filtrate is collected through the filtrate outlet 32a. As mentioned above,
In the filtration device of the present embodiment, the drive shaft and the filtrate channel can be shared. In this embodiment, the disk turbine 40 is mounted. However, if a sufficient liquid flow can be obtained by simply rotating the filter 20, the disk turbine 40 is unnecessary.

(Embodiment 2) FIG. 2 is a partial sectional view showing another embodiment of the filtration device of the present invention, and FIG.
It is sectional drawing by the -A 'line. Parts not shown are the same as those of the first embodiment. In FIG. 2, a filter 20 ′ is connected to the bottom 11 side of the drive pipe 10. The filter 20 ′ has a substantially blade-like shape as a whole, and is formed by adhering a filtration membrane 25 made of polypropylene to one side of the blade, that is, an edge of the filter body 24 having the concave portion 24 a. And the cylindrical protrusion 24
By fitting b into the side pipe 13 'of the pipe 10', communication with the pipe 10 'is established.

In the filtration device of the present embodiment, since the filter 20 'itself has a shape suitable for stirring, it is not necessary to add a stirring blade. The filtrate introduced into the concave portion 24a is, as described above, the side pipe 13 ', the inside of the pipe 10', the filtrate discharge hole 1
It is collected via 2a and filtrate outlet 32a. In addition, since the filtration membrane 25 is provided at a portion that resists the rotational driving of the driving pipe 10, it is easily exposed to the flow of the liquid, and the performance of preventing clogging is sufficient.

In the apparatus of this embodiment, the filter 20 'is used.
Is simply fitted into the side tube 13 ', so that it can be easily replaced. Also, by changing the angle of the side pipe 13 'and / or the protrusion 24b, the mounting angle of the filter 20' which also functions as a stirring blade can be adjusted, and the stirring capacity can be easily controlled. it can.

(Embodiment 3) FIG. 4 is a partial sectional view showing still another embodiment of the filtration device of the present invention, and FIG.
13 is a sectional view taken along line BB ′ of FIG. Parts not shown are the same as those in the first embodiment.

Referring to FIG. 4, in the filtration device of this embodiment,
The filter 20 ″ has a substantially wheel-like shape (see FIG. 5), and is mounted obliquely with respect to the axial direction of the rotary drive pipe 10 ″. Also, the communication with the pipe 10 "is
It is secured by a branch pipe 13 corresponding to a so-called wheel arm. Further, the filter 20 ″ has a donut-shaped concave portion 2.
6, and a donut plate-shaped filtration membrane 27 is attached so as to cover the recess 26.

When the pipe 10 "is rotated in the same manner as in the first embodiment, the wheel-shaped filter 20" functions as a stirring blade, and the filtration can be performed in the same manner as described above. In addition, the stirring efficiency can be changed by the attachment angle of the filter 20 ″ to the pipe 10 ″, but at the same time, the shear stress applied to the target liquid at the time of stirring also changes. Therefore, according to the apparatus of the present embodiment, particularly in a system containing a fragile solid such as an animal cell or a plant cell, by selecting an appropriate mounting angle, it is possible to perform appropriate stirring while avoiding stress. it can. In addition, in perfusion culture in which a fresh medium is introduced while extracting a filtrate from a culture solution, filtration and stirring can be performed simultaneously while preventing clogging of a filter medium, so that the apparatus can be an extremely effective apparatus.

When a wheel-shaped filter is used as in this embodiment, a vertical liquid flow is generated in the vicinity of the central hole 28 and the up and down agitation is improved, but the central hole 28 is closed. Even if the disc-shaped filters are stacked in multiple stages, if the wheel-shaped filters are arranged obliquely as described above, the liquid sandwiched between the filters will move, In a conventional filtering device in which a disc-shaped filter is vertically mounted on a pipe shaft and stacked in multiple stages, a problem that a liquid sandwiched between the filters does not move can be solved.

Although the present invention has been described in detail with reference to some embodiments, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present disclosure. For example, in the above-described embodiment, the drive pipe 10 and the like are rotated. However, a part of the drive pipe is fixed, and the pendulum is moved. Even if it shakes, filtration can be performed simultaneously with stirring. In this case,
Since the pipe does not rotate, a flexible tube can be connected to one end of the pipe and the filtrate can be withdrawn therefrom.

[0035]

As described above, according to the present invention, since the flow path of the filtrate and the drive shaft are shared, etc., the stirring can be performed simultaneously with the filtration, and the filter medium is always used as the target liquid. And a filtration method that can be exposed to a stream of water. That is, according to the present invention,
The filtrate flow path and the stirring shaft, the driving device and the means for supplying the flow of the target liquid to the filter medium can be used in common, and the stirring blade and the filter can be used in combination. Further, since the filter medium can be exposed to a sufficient flow, clogging of the filter medium can be prevented or reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a filtration device of the present invention.

FIG. 2 is a partial sectional view showing another embodiment of the filtration device of the present invention.

FIG. 3 is a sectional view taken along line A-A 'of FIG.

FIG. 4 is a partial sectional view showing still another embodiment of the filtration device of the present invention.

FIG. 5 is a sectional view taken along line B-B ′ of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drive pipe 11 Bottom part 12 Open end 12a Filtrate discharge port 13 Branch pipe 13 'Side pipe 14 Shaft seal 20 Filter 21 Ceramic pipe 20' Blade plate filter 20 "Wheel filter 22 Rubber stopper 23 Rubber tube 24 Filter Body 24a Recess 24b Projection 25 Filtration membrane 26 Recess 27 Donut plate filtration membrane 28 Central hole 30 Motor 31 Fixture 32 Housing 32a Filtrate outlet 40 Disk turbine 50 Target liquid

Claims (9)

[Claims] 1. A bottomed cylindrical drive shaft, a filter connected to the bottom side from an open end of the drive shaft, pressure reducing means for reducing the pressure in the drive shaft, and drive means for driving the drive shaft. A filter device comprising: a filter having a filter medium, protruding from a side of the drive shaft, and having a stirring function. 2. The filtering device according to claim 1, wherein the drive shaft performs a vertical motion, a side reciprocating motion, a rotary motion, a swing motion, and a motion by any combination thereof. 3. The filter according to claim 1, wherein the filter has an oar shape. 4. The filter according to claim 1, wherein the filter has a substantially disk shape, and the drive shaft serving as a rotation shaft is inserted into a substantially central portion thereof, and the disk filter is inclined with respect to the axial direction of the drive shaft. 3. The filter according to claim 1, wherein the filter is arranged side by side, and the filter medium of the filter has a substantially disk shape. 5. The filter according to claim 1, wherein the filter has a substantially donut-like or wheel-like shape, and the drive shaft serving as a rotation shaft is inserted through and arranged substantially at the center of the hole of the donut-like or wheel-like filter. The filter device according to claim 1, wherein the filter material of the filter has a donut plate shape or a wheel plate shape. 6. The filter according to claim 5, wherein the donut-shaped or wheel-shaped filters are arranged obliquely with respect to the axial direction of the drive shaft. 7. The filter according to claim 1, wherein a stirring blade is added to the drive shaft. 8. The filtration device according to claim 1, wherein the object of filtration and stirring is an animal or plant culture solution. 9. A filter having a bottomed cylindrical drive shaft, a filter protruding laterally from a position on the bottom side from the open end of the drive shaft, a filter medium, and a stirring function, and the drive shaft. A filter device comprising: a driving device for driving the filter; wherein the filter is immersed in a target liquid to drive the drive shaft, and the inside of the drive shaft is depressurized or the target liquid is reduced. Or the pressure in the drive shaft is reduced and the target liquid is pressurized.