JPH08155279A - Filter plate for rotary membrane separator - Google Patents

Abstract

PURPOSE: To provide a thin and lightweight filter plate for a rotary membrane separator. CONSTITUTION: This filter plate 20 is formed by superposing a pair of disc- shaped metal flat membranes 30, 30 one upon another to integrally weld the outer peripheral parts 30A, 30A thereof and providing a metal net between the flat membranes 30, 30. When the filter plate 20 is rotated in a liquid to be filtered, the filter plate 20 receives the pressure difference due to the flow of the liquid to be filtered received by both surfaces of the filter plate to be bent but, since the flat membranes 30, 30 on both surfaces of the filter plate 20 and the metal net are formed from a metal being a ductile material, the filter plate 20 is deformed so that the forces received by both surfaces thereof become equal. Therefore, the stress generated in the filter plate 20 is caused only by centrifugal force and the filter plate 20 can be used even if it is thin. By making the filter plate 20 thin, the wt. reduction of the filter plate 20 is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a rotary membrane separator, and more particularly to a filter for a rotary membrane separator used for filtering and concentrating a solution in the manufacturing process of medicines, foods and the like.

[0002]

2. Description of the Related Art As a membrane separator used for filtration,
A filter plate is installed vertically on a horizontally supported rotatable shaft, and the turbulent flow effect caused by rotating the filter plate prevents dirt from accumulating on the filter plate surface and reduces the filtration amount. Controlled filtration devices have been devised.

As a filter plate used in this type of membrane separator, a filter plate made of an inorganic material having excellent corrosion resistance and heat resistance has been devised. For example, it is disclosed in Japanese Patent Laid-Open No. 4-358528. There is a filter plate in which the surface of a support made of a ceramic porous material is covered with a dense ceramic porous filtration membrane. However, when such a filter plate is industrially used, a wide membrane area is required, and therefore the filter plate has a relatively large outer diameter of 500 to 1000 mm. Usually, dozens of filter plates are arranged side by side on a single support shaft, and the intervals between the filter plates are narrowed in order to increase the volumetric efficiency of the device. The filtrate co-rotates with the filter plate. As a result, the shearing force on the surface of the filter plate is reduced, and dirt is accumulated on the surface of the filter plate, and the filtration amount is reduced.

By the way, as a method for simply preventing the decrease of the filtration amount due to the co-rotation of the liquid to be filtered, the actual Kaihei 3-70 is used.
There is one disclosed in Japanese Patent No. 729. This is to insert a baffle plate between the filter plates. By inserting this baffle plate, even if the liquid to be filtered is co-rotating, the filter plate (rotating plate) and the baffle plate (fixed plate) Since a velocity gradient is generated between them, a shearing force can be applied to the surface of the filter plate and dirt can be peeled off.

[0005]

However, in the industrial apparatus, it is extremely difficult to install the baffle plate in the true center between the filter plates and completely parallel to the filter plates. Therefore, the surface of the baffle plate is difficult to install. Since the flow velocity of the liquid to be filtered is different and the pressure is different between the back surface and the back surface, bending stress is generated in the filtered liquid. According to the measurement by the applicant,
When the filtrate is rotated in the liquid-to-be-filtrated, about three times as much load stress is generated as in the air. As a result, when the filter plate is rotated in the liquid to be filtered, it is necessary to increase the thickness of the filter plate to increase its strength. (Usually, an inorganic porous support requires a thickness of 10 mm or more.) However, increasing the thickness of the filter plate not only deteriorates the volume ratio,
Since the weight of the filter plate increases, it is necessary to increase the shaft diameter of the support shaft, and there are drawbacks such that handling becomes difficult.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a thin and lightweight filter plate for a rotary membrane separator.

[0007]

In order to achieve the above-mentioned object, the present invention rotatably arranges a hollow drive shaft, in which a communication port is bored at a predetermined interval in the axial direction, in a cylindrical casing. A plurality of disk-shaped filter plates are fixed to the drive shaft through a collar while facing the communication port, and the liquid to be filtered supplied into the casing is filtered through the filter plate, In the rotary membrane separator that discharges the filtrate through the inside of the drive shaft, the filtration plate is formed by joining a pair of disc-shaped flat metal membranes integrally with each other and forming a spacer between the flat membranes. It is provided and formed.

[0008]

According to the present invention, when the filter plate is rotated in the liquid to be filtered, the filter plate is bent due to the pressure difference due to the flow of the liquid to be filtered which is received on both surfaces of the filter plate. Since is made of a ductile metal, it deforms so that the forces on both sides are equal. Therefore, the stress generated in the filter plate is only due to the centrifugal force, and the filter plate can be used even if it is thin.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the filter plate for a rotary membrane separator according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a rotary membrane separation device to which a filter plate according to the present invention is applied. As shown in the figure, in the rotary membrane separation device 10, a drive shaft 14 is installed at the center of a closed container 12 formed in a cylindrical shape. The drive shaft 14 has a hollow portion 16 formed therein, and a communication port 18 communicating with the hollow portion 16 along the longitudinal direction of the shaft in the outer peripheral portion 14A.
18 are formed at predetermined intervals. The drive shaft 14 is provided with a collar 22, so that the hollow disk-shaped filter plates 20, 20, ... Can communicate with the communication ports 18, 18 ,.
It is attached through 22, .... In addition, the filter plate 2
Baffle plates 24, 24, ... Between 0, 20 ,.
Are provided, and the baffle plates 24, 24, ... Are supported by a support rod 26 provided on a wall surface 12A in the closed container 12.

The rotary type membrane separation device 1 constructed as described above.
0 is the drive shaft 14 by introducing the liquid to be filtered into the closed container 12.
When is rotated, suspended substances and the like contained in the liquid to be filtered are filtered by the filtration plates 20, 20, ... And the filtered liquid is taken out from the hollow portion 16 of the drive shaft 14. 2 is a plan view of the first embodiment of the filter plate according to the present invention, and FIG. 3 is a side view of FIG. As shown in FIGS. 2 and 3, in the filter plate 20, disc-shaped metal flat films 30, 30 are superposed on both surfaces of a metal spacer, for example, a metal net 28 of SUS304, and outer peripheral portions 30A, 30A thereof are welded. And are integrally formed. The flat metal films 30 and 30 are, for example, those obtained by sintering fine metal powder on a rolled wire mesh and have a thickness of about 1 mm. Therefore, the thickness of the filter plate 20 is about 3 mm. Further, a mounting hole 32 for mounting on the drive shaft 14 is formed at the center of the filter plate 20.

The filter plate 2 of the first embodiment constructed as described above.
The action of 0 is as follows. When the filtration plate 20 is set in the rotary membrane separator 10 and the liquid to be filtered is introduced into the closed container 12 and the filtration plate 20 is rotated in the liquid to be filtered, the liquid to be filtered is a flat metal film. Permeate through 30, 30, flat membrane 3
It flows along the wire net 28 between 0 and 30 and reaches the cavity 16 of the drive shaft 14 through the communication port 18.

On the other hand, when the filter plate 20 is rotated in the liquid to be filtered, the filter plate 20 bends due to the pressure difference due to the flow of the liquid to be filtered received on both sides of the filter plate 20, but the flat membranes on both sides of the filter plate 20. Since the wires 30, 30 and the wire netting 28 are made of metal which is a ductile material, they are deformed so that the forces applied to both surfaces are equal. Therefore, the stress applied to the filter plate 20 is only due to the centrifugal force, and it can be used even when the filter plate 20 is thin.

FIG. 4 is a plan view of a second embodiment of the filter plate according to the present invention. As shown in the figure, the filter plate 20 of the second embodiment has four flat membranes 30, 30 of the filter plate 20 described in the first embodiment, which are arranged at 90 ° intervals at four positions of the outer peripheral portions 30A, 30A. The cutouts 30B and 30B are formed, and the cutouts 30 are formed.
B and 30B are provided with balance weights 34, 34, .... By providing the balance weights 34, 34, ... On the filter plate 20, it is possible to adjust the rotational balance of the filter plate 20, and the adjustment method is as follows. A balance measuring device detects the rotational balance of the filter plate 20, and based on the result, the balance weights 34, ...
Make holes 36, 36 ...

As described above, according to the filter plate 20 of the second embodiment, the balance of the filter plate 20 can be easily adjusted. Further, this stabilizes the rotation of the filter plate 20 and can be applied to the use during high-speed rotation. Figure 5
FIG. 6 is a plan view of a third embodiment of the filter plate according to the present invention, and FIG. 6 is a side view of FIG. As shown in FIGS. 5 and 6, the filter plate 20 according to the third embodiment is the outer peripheral portion 30A of the flat membranes 30, 30 of the filter plate 20 described in the first embodiment.
The welding of 30A was performed via the ring 38.

As a result, even if the filter plate 20 is thin, the filter plate 20 is supported by the ring 38,
It will not bend when carried and will be easier to handle. Further, as shown in FIGS. 7 and 8, a ring 40 may be provided in the central portion (mounting hole 32) of the filter plate 20, and rod-shaped reinforcing members 42, 42, ... May be arranged radially from the ring 40. . In this case, the filter plate 20 is supported by the reinforcing members 42, 42, ....

FIG. 9 is a plan view of a fourth embodiment of the filter plate according to the present invention, and FIG. 10 is a side view of FIG. As shown in FIGS. 9 and 10, the filter plate 20 according to the fourth embodiment.
The filter plate 20 described in the first embodiment is integrally formed with the metal collar 18. The color 18
Has a communication port 18A formed at the center of the outer peripheral surface,
The filter plate 20 is attached and welded so that the mounting hole 32 formed at the center communicates with the communication port 18A.

As a result, when the filter plate 20 is mounted on the drive shaft 14, the filter plate 20 can be mounted without using a separate collar 18, and the number of parts can be reduced. Also, FIG.
As shown in FIG. 1, the collar 18 may be integrally formed by welding to the side surface portion of the filter plate 20.

[0018]

As described above, according to the filter plate for a rotary membrane separator of the present invention, when the filter plate is rotated in the liquid to be filtered, the liquid to be filtered receives on both sides of the filter plate. The filter plate bends due to the pressure difference, but since the flat membranes on both sides of the filter plate are made of metal, which is a ductile material, they deform so that the forces applied to both sides are equal. Therefore, the stress generated in the filter plate is only due to the centrifugal force, and the filter plate can be used even if it is thin.

Further, by thinning the filter plate, the weight can be reduced, and it is not necessary to increase the strength of the drive shaft of the rotary membrane separation device, so that the production cost of the device can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rotary membrane separator to which a filter plate according to the present invention is applied.

FIG. 2 is a plan view of a first embodiment of a filter plate according to the present invention.

FIG. 3 is a side view of FIG.

FIG. 4 is a plan view of a second embodiment of the filter plate according to the present invention.

FIG. 5 is a plan view of a third embodiment of the filter plate according to the present invention.

6 is a side view of FIG.

FIG. 7 is a plan view showing a modification of the third embodiment of the filter plate according to the present invention.

8 is a side view of FIG.

FIG. 9 is a plan view of a fourth embodiment of the filter plate according to the present invention.

FIG. 10 is a side view of FIG.

FIG. 11 is a sectional view showing a modification of the fourth embodiment of the filter plate according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rotation type | formula membrane separator 12 ... Airtight container 14 ... Drive shaft 16 ... Cavity 18 ... Communication port 20 ... Filtration plate 22 ... Collar 24 ... Baffle plate 28 ... Wire mesh 30 ... Flat membrane 34 ... Balance weight 38, 40 ... Ring 42 ... Reinforcing member

Claims (6)

[Claims] 1. A hollow drive shaft having communication holes formed at predetermined intervals in the axial direction is rotatably disposed in a cylindrical casing, and a plurality of disc-shaped drive shafts are provided on the drive shaft via a collar. A rotary membrane separation device that fixes the filter plate facing the communication port, filters the liquid to be filtered supplied into the casing through the filter plate, and discharges the filtered liquid through the inside of the drive shaft. In the rotary membrane separation device, the filter plate is formed by joining the outer circumferences of a pair of disc-shaped metal flat membranes integrally with each other and providing a spacer between the flat membranes. Filter plate. 2. The filter plate for a rotary membrane separator according to claim 1, wherein the spacer is a wire mesh. 3. The filter plate for a rotary membrane separator according to claim 1, wherein the filter plate is provided with a balance weight on an outer peripheral portion thereof. 4. The rotary membrane separation filter plate according to claim 1, wherein an outer periphery of the flat plate membrane of the filter plate is welded through a ring. 5. The filter plate for a rotary membrane separator according to claim 1, wherein the filter plate has reinforcing members arranged radially between the flat membranes. 6. The filter plate for a rotary membrane separator according to claim 1, wherein the filter plate is integrally formed with the collar.