JPH06277467A - Rotary flat membrane filter machine - Google Patents

Abstract

PURPOSE:To remove the gas left in the vicinity of the center of rotation by forming through holes to fixed plates and a rotary shaft in axial and diameter directions and generating the flow of the raw soln. passing through the through holes. CONSTITUTION:The rotary flat membrane filter machine is provided with a rotary shaft 1, annular fixed plates 2 externally fitted to the rotary shaft 1 and stacked in such a state that the inner edge parts are mutually brought into contact with each other and annular flat membranes (rotary flat membranes) 5 whose inner edge parts are grasped by the outer edge parts of the adjacent fixed plates 2. Diameter direction through holes 2c for a transmitted soln., the diameter direction holes 2d opened to the outer peripheral surface of the fixed plates 2 at one ends thereof and the axial direction through holes 2e communicating with the diameter direction holes 2d are formed to the fixed plates 2 and a diameter direction hole 1d and an axial direction through hole 1e are formed to the rotary shaft 1 separately from a diameter direction hole 1ab and the raw soln. through holes of the adjacent fixed plates 2 are allowed to communicate each other to form a rotary flat membrane filter machine. The upward flow of the raw soln. passing through the diameter direction hole 2d and the axial direction hole 2e or the diameter direction hole 1d and the axial direction hole 1e removes the gas remaining in the vicinity of the center of the rotation. By this constitution, the area of the rotary flat membrane is reduced and the crack thereof is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary flat membrane filter used in the fields of foods, pharmaceuticals, biotechnology, chemicals and the like.

[0002]

2. Description of the Related Art A rotary flat membrane filter for filtering an undiluted solution while rotating an annular plate-shaped filtration membrane in the undiluted solution has been known. A conventional rotary flat sheet membrane filter generally has a structure shown in FIG. The rotary shaft 101 extends in the vertical direction.
A plurality of annular plate-shaped fixed plates 102 are vertically stacked with the inner edge portions abutting each other, and the rotary shaft 101
Is fitted on. The contact portion of the adjacent fixing plate 102 has an O
A ring 103 is arranged. The outer edge portions of the pair of adjoining fixed plates 102 sandwich the inner edge portion of each one annular flat plate-shaped rotary flat membrane 105 via the O-ring 104. A plurality of tie rods 106 screwed to the flange portion 101a of the rotating shaft 101 that abuts on the fixed plate 102 at the lowermost stage.
, Extend in the vertical direction at predetermined intervals in the circumferential direction, and penetrate the fixing plate 102. Tie rod 106
Is a nut 107 arranged on the uppermost fixing plate 102.
Screwed to the rotary shaft 101, the fixed plate 102, and the O-ring 10.
3, 104 and the rotary flat film 105 are integrally and tightly fastened.

For centering during assembly of the rotary flat film 105, the inner side surface of the rotary flat film 105 has an annular step 102a formed on the outer edge of the upper surface of the fixed plate 102 and the fixed plate 102. It faces the side surface of the annular stepped portion 102b formed on the outer edge portion of the lower surface thereof with a slight radial gap. An annular stepped portion 102 having a fixed plate 102 at one end
A plurality of radial through holes 102c, which are open to the side surface of a and open at the other end to the inner surface of the fixed plate 102, are formed in the fixed plate 102 at predetermined intervals in the circumferential direction. Rotating shaft 10
1, a radial hole 101b communicating with a through hole 102c formed in the fixed plate is formed, and an axial hole 101c communicating with the hole 101b is formed. Rotating shaft 10
A pair of O-rings 108 are arranged between the fixed plate 102 and the fixed plate 102 with the hole 101b interposed therebetween. Rotating shaft 101
A radial through hole 101ab is also formed in the flange portion 101a. One end of the through hole 101ab opens to the side surface of an annular step formed on the outer edge of the upper surface of the flange 101a, and the other end communicates with the axial hole 101c.

A plurality of annular plate-shaped fixing plates 109 are vertically stacked with their outer edges abutting each other. The inner edge portions of the pair of adjoining fixing plates 109 each have an annular plate-shaped baffle plate 11 via an O-ring 110.
The outer edge part of 1 is clamped. Fixing plate 109 and O-ring 1
The baffle plate 10 and the baffle plate 111 are integrally and tightly fastened together by a tie rod 112 which is arranged at a predetermined interval in the circumferential direction and extends in the vertical direction.

A fixed plate 109 tightly and integrally fastened,
A baffle plate assembly including an O-ring 110, a baffle plate 111, and a tie rod 112 is sandwiched by a disc-shaped bottom plate 113 and a disc-shaped top plate 114. The baffle membrane assembly, the bottom plate 113, and the top plate 114 are integrally and tightly fastened together by a plurality of tie rods 115 arranged at predetermined intervals in the circumferential direction. Fixed plate 1 stacked
09, the bottom plate 113, and the top plate 114 form the casing 11
6 is formed.

A rotary shaft 101 tightly and integrally fastened
Fixing plate 102 and O-rings 103, 104, 108
, Rotary flat film 105, tie rod 106, nut 1
The rotating flat sheet membrane assembly constituted by the No. 07 and No. 07 is housed in the casing 116. The rotating flat membrane 105 is the baffle plate 1
It extends between 11.

The rotating shaft 101 is driven to rotate by a motor (not shown), which in turn drives the rotary flat film 105 to rotate. A stock solution stored in a stock solution tank (not shown) passes through an inlet 117 formed in the bottom plate 113 and the casing 11
6 and flows upward through a zigzag flow path formed by the rotary flat film 105 and the baffle 111, and the top plate 1
Through an outlet 118 formed in the casing 116
Drained from. The stock solution flowing out of the casing 116 is returned to a stock solution tank (not shown).

The stock solution is filtered by the rotary flat membrane 105. The permeated liquid that has permeated the rotary flat membrane 105 is fixed plate 102.
Through the through hole 102c formed in the rotary shaft 101, the radial hole 101b formed in the rotary shaft 101, and the axial hole 101c, or the through hole 10 formed in the flange portion 101a of the rotary shaft.
1 ab and the axial hole 101 c, and flows downward from the casing 116. The O-ring 103 seals the abutting portion of the adjacent fixing plate 102 and prevents the permeated liquid from entering the portion. The O-ring 108 seals the contact portion between the fixed plate 102 and the rotary shaft 101, and prevents the permeated liquid from entering the portion. The O-ring 104 is the fixed plate 102.
The gap between the rotary flat membrane 105 and the rotary flat membrane 105 is sealed to prevent the stock solution from mixing with the permeate. In the rotary flat membrane filter, the relative rotation between the baffle plate and the rotary flat membrane causes a shearing force to act on the stock solution existing between the baffle plate and the rotary flat membrane, and the cake layer on the membrane surface is removed. The concentration polarization on the film surface is suppressed and the film contamination is prevented.

[0009]

In the rotary flat sheet membrane filter, a component having a high density in the stock solution existing between the adjacent rotary flat sheet membranes is radially outward due to the centrifugal force caused by the rotation of the flat sheet membrane. However, since the gas contained in the stock solution or the gas generated from the stock solution has a low density, it is left behind near the center of rotation. Therefore, the film surface of the radially inner portion is covered with gas, and the film area is reduced. Further, when only one surface of the rotating flat film is covered with gas, bending stress occurs in the flat film. If the flat membrane is made of ceramic, bending stress may cause the flat membrane to crack. In the case of filtering a highly viscous stock solution, the above problem is not limited to a filter in which the rotating shaft extends vertically, that is, a filter in which the rotating flat membrane extends horizontally, but the rotating shaft extends horizontally. It can also occur in working filters, i.e. filters in which the rotary flat membrane extends vertically. The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rotary flat sheet membrane filter equipped with means for removing gas left behind near the center of rotation.

[0010]

In order to solve the above-mentioned problems, according to the present invention, a rotating shaft and an annular ring which are fitted on the rotating shaft and are stacked on each other with their inner edges abutting each other. Fixing plate and an annular flat plate membrane whose inner edge is sandwiched between outer edges of adjacent fixing plates.The fixing plate has a radial through hole for permeate, a radial hole for stock solution, and a radial hole. And an axial through hole communicating with the radial hole for communicating with the through hole for permeating liquid of the fixed plate and an axial hole communicating with the radial hole. An unfixed liquid through hole is formed in the adjacent fixing plate to provide a rotary flat membrane filter in communication with each other. Further, in the present invention,
A rotary shaft, and an annular fixing plate that is externally fitted to the rotary shaft and is stacked and arranged with the inner edge portions abutting each other,
An annular flat plate membrane whose inner edge is sandwiched by outer edges of adjacent fixing plates is provided, and the fixing plate has radial holes for permeate, axial through holes communicating with the radial holes, and radial directions for stock solution. A through hole is formed separately and independently, and a rotary shaft has a permeate axial hole communicating with the permeate through hole of the fixed plate and a radial direction of the stock solution communicating with the stock solution through hole of the fixed plate. Provided is a rotary flat sheet membrane filter in which a hole and an axial hole communicating with the radial hole are formed separately and independently. In a preferred embodiment of the present invention, an axial through hole is formed near the inner edge of the flat plate film.

[0011]

According to the present invention, a flow of the stock solution is generated through the radial holes for the stock solution formed in the fixed plate and the axial through holes communicating with the radial holes, and the flow of the stock solution causes the center of rotation to rotate. The gas left in the vicinity is removed. Further, in the present invention, the radial through holes for the stock solution formed in the fixed plate and the radial through holes for the stock solution communicating with the through holes for the stock solution formed in the fixed plate formed in the rotary shaft are communicated with the radial holes for the stock solution. A flow of the undiluted solution passing through the axial hole is generated, and the gas left in the vicinity of the rotation center is removed by the flow of the undiluted solution. The axial through hole formed near the inner edge of the flat plate film causes a flow of the stock solution in the axial direction through the through hole, and the gas left behind near the center of rotation is removed by the flow of the stock solution. This further promotes the removal of the gas left behind near the center of rotation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, in this embodiment, the permeated liquid was formed in the radial through holes 2c formed in the fixed plate 2 and the rotary shaft 1 as in the conventional rotary flat sheet membrane filter shown in FIG. A radial hole 1ab and an axial hole 1 which pass through the radial hole 1b and the axial hole 1c or are formed in the flange portion 1a of the rotation 1
It flows through c and downward and flows out of the casing 16.

The fixing plate 2 is formed with a radial hole 2d whose one end opens to the outer peripheral surface and an axial through hole 2e which communicates with the radial hole 2d, independently of the radial through hole 2c. ing. Only the through hole 2e is formed in the uppermost fixed plate 2. The through holes 2e of the adjacent fixing plates 2 communicate with each other. The periphery of the communication portion of the adjacent through holes 2e is sealed by an O-ring (not shown). The flange portion 1a of the rotary shaft 1 is also formed with a radial hole 1d and an axial through hole 1e, separately from the radial hole 1ab. Through hole 1
e is formed so as not to reach the lower surface of the flange portion 1a. The through hole 1e is the through hole 2e of the lowermost fixed plate 2.
Is in communication with. The periphery of the communication part is sealed by an O-ring (not shown). Except for the above, the structure of the rotary flat membrane filter according to this embodiment is the same as that of the conventional rotary flat membrane filter. In this embodiment, it passes through the radial hole 2d and the axial hole 2e formed in the fixed plate 2, or through the radial hole 1d and the axial hole 1e formed in the flange portion 1a of the rotary shaft 1. An upward flow of the stock solution is generated, and the gas left behind near the center of rotation is removed by the flow of the stock solution. The gas that has moved upward through the through holes 1e and 2e together with the stock solution merges with the stock solution that has moved through the zigzag flow path formed between the rotary flat membrane 5 and the baffle plate 11 at the top of the casing 16. Then, it is discharged to the outside of the casing through the outlet 18 of the casing 16.

A second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2, in this embodiment, the fixing plate 22 has an annular step portion 22 formed on the outer edge of the upper surface.
A plurality of radial holes 22c, one end of which is open at the side surface of a, are formed at predetermined intervals in the circumferential direction. Further, the fixed plate 22 has an axial through hole 22 communicating with the radial hole 22c.
d is formed. The axial through hole 22d ₁ of the second fixing plate 22 from the top is formed so as not to reach the upper surface of the fixing plate 22. The uppermost fixed plate 22 has neither radial holes 22c nor axial through holes 22d. The through holes 22d of the adjacent fixing plates 22 communicate with each other. The periphery of the communication portion of the adjacent through holes 22d is sealed by an O-ring (not shown). The fixing plate 22 is provided with a plurality of radial through holes 22e, one end of which opens to the outer peripheral surface, at predetermined intervals in the circumferential direction, independently of the radial holes 22c and the axial through holes 22d. There is.

The rotary shaft 21 is formed with a radial hole 21d communicating with a through hole 22e formed in the fixed plate, and further with an axial hole 21e communicating with the hole 21d. The axial hole 21e is closed below the lowermost fixing plate 22. The axial hole 21e extends upward and penetrates the rotary shaft 21. A communicating portion between the radial through hole 22e of the fixed plate 22 and the radial hole 21d of the rotary shaft 21 has a pair of O-rings arranged between the fixed plate 22 and the rotary shaft 21 with the hole 21d interposed therebetween. It is sealed by 28. The flange portion 21a of the rotary shaft 21 is formed with radial holes 22c and axial holes 21ad similar to the radial holes 22c and the axial through holes 22d of the fixed plate 22. The upper end of the axial hole 21ad communicates with the axial through hole 22d of the lowermost fixing plate 22. The periphery of the communicating portion between the axial hole 21ad and the axial through hole 22d of the lowermost fixing plate 22 is sealed by an O-ring (not shown). The lower end of the axial hole 21ad communicates with the axial hole 21c formed in the rotary shaft 21 below the axial hole 21e. The axial hole 21c is the axial hole 2
It is closed slightly below the lower end of 1e. Axial hole 2
1c extends downward and penetrates the rotary shaft 21. In the flange portion 21a of the rotary shaft 21, a plurality of radial holes 21f having one end opened to the outer peripheral surface are formed at predetermined intervals in the circumferential direction, independently of the radial holes 21ac and the axial holes 21ad. ing. The other end of the hole 21f is the axial hole 21 of the rotary shaft.
It communicates with e. Except for the above, the structure of the rotary flat membrane filter according to this embodiment is the same as that of the conventional rotary flat membrane filter.

In the present embodiment, the radial hole 22e of the fixed plate 22, the radial hole 21d of the rotary shaft 21, and the axial hole 21.
e, or a radial hole 21f formed in the flange portion 21a of the rotary shaft 21 and an axial hole 21e of the rotary shaft 21.
An upward flow of the undiluted solution passes through and, and the gas left behind near the center of rotation is removed by the undiluted solution flow. The gas, which has moved upward through the axial hole 21e of the rotary shaft 21 together with the stock solution, moves through the zigzag flow path formed between the rotary flat film 25 and the baffle plate 31 and the stock solution and the casing 36. Merge at the top and exit 38 of casing 36
Is discharged to the outside of the casing. Although the embodiments of the present invention have been described above, in any of the embodiments, the removal of the gas left in the vicinity of the center of rotation prevents the reduction of the film area of the rotary flat film, and also the rotary flat film. When is made of ceramic, the occurrence of cracks in the rotary flat film is prevented.

In addition to the gas vent holes formed in the fixing plates 2 and 22 described above, as shown by the alternate long and short dash lines in FIGS.
The rotary flat films 5, 25 may be provided with axial through holes 5a, 25a for degassing at positions close to the outer edges of the fixed plates 2, 22. When the rotary flat membranes 5 and 25 are made of ceramic, the cross-sections of the through holes 5a and 25a may form an active layer in the portions to function as a part of the filtration membrane, or may be covered with a sealant. Then, it does not have to function as a filtration membrane.
According to this configuration, the through holes 5a of the rotary flat films 5, 25,
An upward flow of the stock solution passes through 25a, and the gas left behind near the center of rotation is removed by the flow of the stock solution.
Therefore, the removal of the gas left behind near the center of rotation is further promoted. The present invention is not limited to the above embodiment. For example, the axis of rotation may extend horizontally.

[0018]

As described above, according to the present invention, a flow of the stock solution is generated through the radial holes for the stock solution formed in the fixed plate and the axial through holes communicating with the radial holes, and the stock solution is generated. The gas left in the vicinity of the center of rotation is removed by the flow of. Further, in the present invention, the radial through holes for the stock solution formed in the fixed plate and the radial through holes for the stock solution communicating with the through holes for the stock solution formed in the fixed plate formed in the rotary shaft are communicated with the radial holes for the stock solution. A flow of the undiluted solution passing through the axial hole is generated, and the gas left in the vicinity of the rotation center is removed by the flow of the undiluted solution. The axial through hole formed near the inner edge of the flat plate film causes a flow of the stock solution in the axial direction through the through hole, and the gas left behind near the center of rotation is removed by the flow of the stock solution. This further promotes the removal of the gas left behind near the center of rotation. By removing the gas left behind near the center of rotation, the reduction of the membrane area of the rotary flat membrane is prevented, and when the rotary flat membrane is made of ceramic,
The occurrence of cracks in the rotary flat film is prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a rotary flat sheet membrane filter according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of a rotary flat sheet membrane filter according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the structure of a rotary flat sheet membrane filter having a conventional structure.

[Explanation of Codes] 2, 22 Fixed Plate 5, 25 Rotating Flat Membrane 5a, 25a Axial Through Hole 2d Undiluted Liquid Radial Hole Formed in Fixed Plate 2e Undiluted Liquid Axial Through Hole Formed in Fixed Plate 21d Rotated Radial hole for undiluted solution formed on shaft 21e Axial hole for undiluted solution formed on rotating shaft 22e Radial through hole for undiluted solution formed on fixed plate

Front page continuation (72) Ikuo Itakura Ikuo Itakura 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City Tohoku Kikai Co., Ltd. (72) Masaki Kitamura 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City Higashi Tohoku Equipment Co., Ltd.

Claims (5)

[Claims] 1. An inner edge portion is sandwiched between a rotating shaft, an annular fixing plate that is fitted over the rotating shaft and is stacked in a state where the inner edge portions are in contact with each other, and an outer edge portion of an adjacent fixing plate. The fixed plate is provided with a radial through hole for the permeate, a radial hole for the undiluted solution, and an axial through hole communicating with the radial hole. A radial hole for permeate that communicates with the through hole for permeate in the fixed plate and an axial hole that communicates with the radial hole are formed in the, and the through holes for undiluted solution in the adjacent fixed plates communicate with each other. Rotating flat membrane filter. 2. An inner edge portion is sandwiched between a rotating shaft, an annular fixing plate that is fitted over the rotating shaft and is stacked in a state where the inner edge portions are in contact with each other, and an outer edge portion of an adjacent fixing plate. The fixed plate is provided with a radial hole for the permeate, an axial through hole communicating with the radial hole, and a radial through hole for the stock solution, which are formed independently of each other. The axial hole for permeate that communicates with the through hole for permeate of the fixed plate, the radial hole for stock solution that communicates with the through hole for stock solution of the fixed plate, and the axial hole that communicates with the radial hole. A rotary flat sheet membrane filtration machine in which is formed independently. 3. The rotary flat membrane filter according to claim 1, wherein an axial through hole is formed near the inner edge of the flat plate membrane. 4. The rotary flat sheet membrane filtering machine according to claim 3, wherein the flat plate membrane is a ceramic flat plate membrane, and an active layer is formed in a cross section of the through hole. 5. The rotary flat sheet membrane filtering machine according to claim 3, wherein the flat plate membrane is a ceramic flat plate membrane, and the cross section of the through hole is covered with a sealant.