JPH07155565A - Rotary membrane separator - Google Patents

Abstract

PURPOSE:To provide the separator capable of exerting a peeling power on the surface of a filter plate to keep the contaminant removability and capable of remarkably reducing the load stress generated in the filter plate. CONSTITUTION:A rod-shaped baffle 26 is freely movably fixed in a clearance between filter plates 18 in the axial direction of a rotating shaft 22. Accordingly, a velocity gradient is generated to exert a shearing force on the surface of the filter plate 18, and the contaminant is released from the filter plate 18. Further, the baffle 26 is moved to a position where the pressures on both sides are equalized by a fluid resistance, and hence the load stress generated in the filter plate 18 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary membrane separator for filtering a solution by a solid-liquid separation filter plate.

[0002]

2. Description of the Related Art For example, in a filtration device (membrane separation device) used for concentrating a solution in the manufacturing process of medicines, foods, etc., a flat plate-shaped filtration plate is used as a membrane element and the filtration plate is rotated by a rotary shaft. Supporting configurations are known.

In this type of filtration device (filtration plate), by rotating the filtration plate together with the rotating shaft, a shearing force (peeling force) associated with the viscosity of the solution acts on the surface of the filtration plate to remove dirt. It is possible to suppress the decrease in the filtration amount.

By the way, in the case of industrially utilizing such a filtering device on a large scale, it is necessary to increase the filtering area in order to filter a large amount of solution. Therefore, a plurality of filtering plates are arranged at predetermined intervals. Installed in parallel with the rotating shaft. Further, in order to increase the volumetric efficiency of the device, the facing gap between the filter plates is set narrow.

By the way, when the facing gap between the filter plates is set narrow as described above, the solution between the filter plates co-rotates with the filter plate due to its viscosity. Therefore, there is a problem that the shearing force (peeling force) of the solution acting on the surface of the filter plate is lowered, and the dirt removing performance and the filtration amount are lowered.

[0006] Therefore, in order to prevent the deterioration of the dirt removal performance and the filtration amount due to the co-rotation of the solution as described above, there has been proposed a filtration device having a structure in which a baffle plate is arranged in a facing gap of a plurality of arrayed filtration plates. (Actual Kaihei 3-7072
No. 9). According to this filtration device, even if the solution co-rotates with the filtration plate, a velocity gradient can be generated between the filtration plate (rotating plate) and the baffle plate (fixed plate). A shearing force (peeling force) can be applied to the resin to prevent the stain removal performance and the filtration amount from decreasing.

However, in the filtration device having the baffle plate, there is a problem that the load stress generated in the filtration plate becomes large. That is, in an industrial filtration device that filters a large amount of solution, it is extremely difficult to install the baffle plate in the true center between the filtration plates in a state of being completely parallel to the filtration plates, and the cost is high. Therefore, the flow velocity of the solution is different between the front surface and the rear surface of the baffle plate in the facing gap of the filter plate, and thus the pressure is also different, which causes bending stress in the filter plate. According to actual measurement, when the filter plate was rotated in the solution, about three times as much load stress was generated as when the filter plate was rotated in the air.

As a result, in order to withstand such a large load stress, it becomes necessary to increase the thickness of the filter plate to improve its strength, which greatly reduces the volumetric efficiency of the device. However, there remains a problem that the weight of the filter plate increases and the shaft diameter of the rotary shaft needs to be thickened, and a countermeasure for this has been earnestly desired.

[0009]

In consideration of the above facts, the present invention can apply a shearing force (peeling force) to the surface of the filter plate to prevent the dirt removal performance and the filtration amount from being lowered. In addition, it is an object of the present invention to provide a rotary membrane separation device that can significantly reduce the load stress generated in the filter plate.

[0010]

According to a first aspect of the present invention, there is provided a rotary membrane separation device in which a plurality of filtration plates for solid-liquid separation are juxtaposed at predetermined intervals and supported by a rotary shaft. In addition, the baffle is formed in a rod shape, is supported movably in parallel with the rotation axis in the facing gap of the filter plate, and is moved by a fluid resistance force accompanying the rotation of the filter plate. There is.

A rotary membrane separator according to a second aspect of the present invention is the rotary membrane separator according to the first aspect, in which a facing gap between the baffle and the filter plate is defined by a radially outer portion of the filter plate. It is characterized in that it is narrowed in the inner portion in the radial direction.

[0012]

According to the first aspect of the present invention, in the rotary membrane separation device, a plurality of filter plates, which are arranged side by side at a predetermined interval on the rotary shaft and are supported in parallel, are rod-shaped and parallel to the rotary shaft at the facing gap of the filter plates. A baffle movably instructed is provided.

Since the baffle is rod-shaped, a velocity gradient can be generated between the baffle and the filter plate in the same manner as the plate-shaped one. A shearing force (peeling force) can be applied to the. Therefore, it is possible to prevent the stain removal performance and the filtration amount from decreasing.

Further, since the surface area of the baffle is smaller than that of the plate-shaped one, the load acting on the filter plate is small even if the pressures on the front and rear sides of the baffle are not uniform, and the load stress generated on the filter plate is small. Get smaller. Further, since the baffle is movably supported in the opposing gap of the filter plate in parallel with the rotation axis, even if the pressure on the front and rear sides of the opposing gap of the filter plate is not uniform, the baffle is filtered to a position where the pressure is uniform. It is moved by the fluid resistance force caused by the rotation of the plate, and as a result, the pressure becomes uniform and the load stress generated on the filter plate is reduced.

As described above, in the rotary membrane separator according to the first aspect, not only the dirt removal performance and the reduction in filtration amount can be prevented, but also the load stress generated on the filter plate can be significantly reduced. You can

In the rotary membrane separator according to the second aspect of the present invention, since the facing gap between the baffle and the filter plate is narrow at the inner portion in the radial direction of the filter plate where the relative velocity with the solution is small and co-rotation easily occurs, the filter plate surface is formed. A large shearing force (peeling force) can be applied. On the other hand, in the radially outer part of the filter plate where the relative velocity with the solution is large, the facing gap between the baffle and the filter plate is wide, so the load acting on the filter plate is small. The stress applied to the filter plate becomes small.

As described above, in the rotary membrane separator according to the second aspect of the present invention, the load stress generated in the filter plate can be reduced while appropriately applying the shearing force (peeling force) to the surface of the filter plate. Can be satisfied.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall schematic sectional view of a rotary membrane separator 10 according to a first embodiment of the present invention.
Further, FIG. 2 shows a sectional view of the rotary membrane separation device 10 taken along line 2-2 of FIG.

The rotary membrane separator 10 has a cylindrical closed container 12. The closed container 12 has an inlet 1
4 and the outflow port 16 are provided, and the solution (liquid to be filtered) is introduced from the inflow port 14 and taken out from the outflow port 16. A filter plate 18 is arranged in the closed container 12. The filter plate 18 is formed in a hollow disc shape,
A plurality of sheets are arranged side by side at a predetermined interval, and are further connected to the shaft core hole 24 of the rotary shaft 22 through the communication hole 20 and attached.
Therefore, in the solution (liquid to be filtered) introduced from the inflow port 14, the suspended material and the like are removed by the filter plate 18, and then the filtered solution is taken out from the shaft core hole 24 through the communication hole 20, and The concentrated liquid after filtration from which suspended substances and the like have been removed is taken out from the outlet 16.

A baffle 26 is provided in the closed container 12.
Are arranged. The baffles 26 are formed in a rod shape having a circular cross-section and are set as a pair. The baffles 26 are located in the facing gaps of the filter plates 18 and are movable in the facing gaps along the axial direction of the rotary shaft 22. It is attached to the support portion 28. Therefore, when the pressures on the front and rear sides of the baffle 26 in the facing gap of the filter plate 18 are not uniform, the baffle 26 is moved to a position where this pressure becomes uniform by the fluid resistance force accompanying the rotation of the filter plate 18. Is configured.

In the rotary type membrane separation apparatus 10 having the above-mentioned structure, the solution (liquid to be filtered) introduced from the inflow port 14 has the suspended substance and the like removed by the filter plate 18, and then the filtered solution has a communication hole. The concentrated liquid after filtration, which has been removed from the shaft core hole 24 via 20 while the suspended solids and the like have been removed, is the outlet 1.
Taken out from 6.

Here, since the baffle 26 is in the form of two rods in a pair, a velocity gradient equivalent to that of the plate-shaped one can be generated between the baffle 26 and the filter plate 18, whereby the filter plate 18 is formed. A shearing force (peeling force) equivalent to that of a plate-shaped member can be applied to the surface. Therefore, it is possible to prevent the stain removal performance and the filtration amount from decreasing.

Further, since the baffle 26 has a smaller surface area than the plate-shaped one, even if the pressures on the front and rear sides of the baffle 26 are not uniform (in other words, the filter plate 18
Even if the baffle 26 is not placed in the true center between the filter plates 18 in parallel with the filter plate 18, the load acting on the filter plate 18 is small and the load stress generated on the filter plate 18 is small. . Further, since the baffle 26 is movably supported in the facing gap of the filter plate 18, even if the pressures on the front and rear sides of the baffle 26 in the facing gap of the filter plate 18 are not uniform, a position where this pressure becomes uniform is provided. The filter plate 18 is moved by the fluid resistance force accompanying the rotation, and as a result, the pressure becomes uniform, and the load stress generated in the filter plate 18 is further reduced. According to the actual measurement, the load stress could be reduced to 1/2 or less as compared with the conventional plate-shaped baffle.

As described above, in the rotary membrane separator 10,
Not only can the stain removal performance and the filtration amount be prevented from decreasing, but the load stress generated on the filter plate 18 can be greatly reduced.

The baffle 2 in the first embodiment
6 is not limited to a circular cross-sectional shape, but may be another shape such as a triangular or quadrangular cross-sectional shape, a star-shaped or L-shaped sectional shape, or a spiral groove or spiral. It may be formed by twisting into a shape. By making the cross-sectional shape of the baffle 26 into a polygonal shape in this way, the turbulence (turbulence) of the solution when the solution collides with the baffle 26 becomes large, and the shearing force acting on the surface of the filter plate 18 is further increased. It can be made larger and is more effective.

Next, another embodiment of the present invention will be described. The parts that are basically the same as those in the first embodiment have the first
The same reference numerals as in the embodiment are given and the description thereof is omitted.

FIG. 3 shows an overall schematic cross-sectional view of the rotary membrane separation device 30 according to the second embodiment. Further, FIG. 4 shows a cross-sectional view of the rotary type membrane separation device 30 taken along line 4-4 of FIG.

In the rotary type membrane separator 30, the baffle 32 is used.
Are arranged. The baffle 32 is composed of a cylindrical portion 34 and a blade portion 36. The baffle 32 is located in a facing gap between the filter plates 18 and is orthogonal to the rotation shaft 22. The support shaft 38 is fixed to the support portion 28. Is rotatably attached. The baffles 32 are set as a set of two and are located in the facing gaps of the filter plates 18. Therefore, when the pressures on the front and rear sides of the baffle 32 in the facing gap of the filter plate 18 are not uniform, the blade portion is moved around the support shaft 38 by the fluid resistance force accompanying the rotation of the filter plate 18 to a position where this pressure becomes uniform. 36 is configured to swing.

The blade portion 36 of the baffle 32 is
It is preferably formed of a flexible resin material such as polypropylene or a thin metal material.

Also in this rotary membrane separator 30, the solution (liquid to be filtered) introduced from the inflow port 14 is filtered by the filter plate 1.
After the suspended substances and the like are removed by 8, the filtered solution is taken out from the shaft hole 24 through the communication hole 20, while the filtered concentrated liquid from which the suspended substances and the like are removed is taken out from the outlet 16. Be done.

The baffle 3 of the rotary membrane separator 30
Also in No. 2, it is possible to generate a velocity gradient similar to that of a plate-like one between the filter plate 18 and
A shearing force (peeling force) equivalent to that of a plate-shaped member can be applied to the surface of the filter plate 18. Therefore, it is possible to prevent the stain removal performance and the filtration amount from decreasing.

Further, since the baffle 32 is rotatably supported around the support shaft 38 in the facing gap of the filter plate 18, the pressures on the front and rear sides of the baffle 32 in the facing gap of the filter plate 18 are not uniform. The blade portion 36 is swung around the support shaft 38 by the fluid resistance force caused by the rotation of the filter plate 18 to the position where the pressure becomes uniform, and as a result, the pressure becomes uniform and the load stress generated on the filter plate 18 is increased. Is further reduced.

As described above, also in the rotary membrane separator 30, not only can the deterioration of the dirt removal performance and the filtration amount be prevented, but also the load stress generated on the filter plate 18 can be greatly reduced. .

The baffle 3 in the second embodiment
In the second embodiment, the cylindrical portion 34 is rotatably supported by the support shaft 38, but the present invention is not limited to this. The cylindrical portion 34 is integrally fixed to the support shaft 38, and the support shaft 38 is supported by the support portion 28. It may be rotatably attached.

FIG. 5 shows an overall schematic sectional view of a rotary type membrane separation device 40 according to the third embodiment.

In the rotary type membrane separator 40, the baffle 42 is used.
Are arranged. One end of the baffle 42 has a rotating shaft 2
2 is movably penetrated by a support shaft 44 arranged in parallel with the shaft 2, and is located in a gap facing each filter plate 18. Therefore, when the pressures on the front and rear sides of the baffle 42 in the facing gap of the filter plate 18 are not uniform, the pressure is configured to be moved to a position where the pressure becomes uniform by the fluid resistance force accompanying the rotation of the filter plate 18. ing.

A stopper 46 is fixed to the support shafts 44 on both sides of the supporting portion of the baffle 42.
Of unnecessary movement (to prevent contact with the filter plate 18).

The rotary membrane separation device 4 according to the third embodiment.
Even in the baffle 42 of 0, a velocity gradient similar to that of the plate-shaped one can be generated between the baffle 42 and the filter plate 18, and thus the shearing force (peeling force) equivalent to that of the plate-shaped one is generated on the surface of the filter plate 18. ) Can be activated. Therefore, it is possible to prevent the stain removal performance and the filtration amount from decreasing.

Since the baffle 42 is movably supported in the facing gap of the filter plate 18, the filter plate 18
Even if the pressures on the front and rear sides of the baffle 42 in the facing gap are not uniform, the filter plate 18 is moved to a position where this pressure becomes uniform.
The baffle 42 is moved by the fluid resistance force caused by the rotation of the filter, and as a result, the pressure becomes uniform, and the load stress generated in the filter plate 18 is further reduced. According to the actual measurement, the load stress could be reduced to 1/2 or less as compared with the conventional plate-shaped baffle.

As described above, also in the rotary membrane separation device 40, not only the deterioration of the dirt removing performance and the filtration amount can be prevented but also the load stress generated in the filtration plate 18 can be greatly reduced. .

FIG. 6 shows an overall schematic sectional view of a rotary type membrane separation device 50 according to the fourth embodiment.

In the rotary type membrane separator 50, the baffle 52
Are arranged. The baffle 52 is formed in a trapezoidal shape in a side view, and has a short piece side attached to the support portion 28 so as to be movable along the axial direction of the rotating shaft 22 in the facing gap between the filter plates 18. That is, the facing gap between the baffle 52 and the filter plate 18 is configured to be narrower in the radially inner portion than in the radially outer portion of the filter plate 18.

The rotary membrane separator 5 according to the fourth embodiment.
Even with the baffle 52 of 0, a velocity gradient equivalent to that of a plate-shaped member can be generated between the baffle 52 and the filter plate 18, and thus a shearing force (peeling force) equivalent to that of the plate-shaped member is generated on the surface of the filter plate 18. ) Can be activated. Therefore, it is possible to prevent the stain removal performance and the filtration amount from decreasing.

Further, since the baffle 52 is movably supported along the rotating shaft 22 in the facing gap of the filter plate 18, the pressure on the front and rear sides of the baffle 52 in the facing gap of the filter plate 18 is not uniform. The baffle 52 is moved to the position where the pressure becomes uniform by the fluid resistance force caused by the rotation of the filter plate 18, so that the pressure becomes uniform and the load stress generated in the filter plate 18 is reduced.

Further, the baffle 52 has a small relative velocity with the solution and is liable to cause co-rotation. A large shearing force (peeling force) can be applied, while the radially outer part of the filter plate 18 (in other words, the part that greatly affects the load stress of the filter plate 18) is separated from the baffle 52 and the filter plate 18. The turbulent flow is unlikely to occur in the solution because the facing gap is large, and the load acting on the filter plate 18 is small, and the load stress generated on the filter plate 18 is small. According to actual measurement, the load stress of this baffle 52 could be reduced to 2/3 as compared with the conventional plate-shaped baffle.

As described above, in the rotary type membrane separator 50 according to the fourth embodiment, the load stress generated on the filter plate 18 can be reduced while appropriately applying the shearing force (peeling force) to the surface of the filter plate 18. , Both can be effectively satisfied.

[0048]

As described above, the present invention has the following effects.

In the rotary membrane separator according to the first aspect of the present invention, not only can the shearing force (peeling force) be applied to the surface of the filter plate to prevent the dirt removal performance and the filtration amount from decreasing, but The generated load stress can be significantly reduced.

In the rotary membrane separator according to the second aspect, the shearing force (peeling force) is appropriately applied to the surface of the filter plate to maintain the dirt removal performance, and the stress applied to the filter plate can be reduced. Can be effectively satisfied together.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the overall configuration of a rotary membrane separation device according to a first embodiment of the present invention.

2 is a cross-sectional view of the rotary membrane separator taken along line 2-2 of FIG.

FIG. 3 is a schematic cross-sectional view showing the overall structure of a rotary membrane separation device according to a second embodiment of the present invention.

4 is a sectional view of the rotary membrane separator taken along line 4-4 of FIG.

FIG. 5 is a schematic sectional view showing the overall structure of a rotary membrane separation device according to a third embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view showing the overall structure of a rotary membrane separation device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 10 Rotation Type Membrane Separation Device 12 Airtight Container 18 Filtration Plate 22 Rotation Shaft 26 Baffle 30 Rotation Type Membrane Separation Device 32 Baffle 40 Rotation Type Membrane Separation Device 42 Baffle 50 Rotation Type Membrane Separation Device 52 Baffle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroto Masuda Inventor Hiroto Masuda 1-1-14 Kanda Uchida, Chiyoda-ku, Tokyo Inside Hirit Plant Construction Co., Ltd. (72) Mitsuru Hatanaka 537 Uehongo, Matsudo, Chiba Prefecture Hitachi (72) Inventor Masataka Kasai, 13-14 Kita-Otsuka Kita-Otsuka, Toshima-ku, Tokyo Within Hitachi Plant Construction Software Co., Ltd.

Claims (2)

[Claims] 1. A rotary membrane separation device in which a plurality of filtration plates for solid-liquid separation are juxtaposed at a predetermined interval and are supported by a rotary shaft, wherein the filtration plates are formed in a rod shape, and the rotation is performed in a facing gap of the filtration plates. A rotary membrane separation device comprising a baffle that is movably supported parallel to an axis and that is moved by a fluid resistance force that accompanies the rotation of the filtration plate. 2. The rotary membrane separation device according to claim 1, wherein a facing gap between the baffle and the filter plate is narrower in a radially inner portion than in a radially outer portion of the filter plate.