JPH05237349A - Membrane separator - Google Patents

Abstract

(57) [Summary] [Objective] To provide a low-power and inexpensive membrane separation device. [Structure] A membrane separation means 23 rotatably arranged and a rotatable baffle plate 24 arranged between the membrane separation means 23 are arranged in the closed tank 21, and these membrane separation means 23 are arranged. , The baffle plate 24 has bearings 25 and 26, respectively.
Is fixed to the hollow shafts 27 and 28 rotatably supported by. A third gear 32 is fixed to the hollow shaft 27 on the membrane separating means 23 side, and the first gear 30 of the hollow shaft 29 is fixed.
Meshes with. Also, the hollow shaft 28 on the side of the baffle plate 24
A fourth gear 33 is fixed to and is meshed with the second gear 31 of the hollow shaft 29. Due to the meshing relationship of these gears, the membrane separating means 23 can be rotated at a lower speed than the baffle plate 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane separation device, and more particularly to a membrane separation device provided with a baffle plate which rotates in a closed tank at a higher speed than the membrane separation means.

[0002]

2. Description of the Related Art Conventionally, in this type of membrane separator,
As shown in FIGS. 3 and 4, the separation means 2 is rotatably arranged in the closed tank 1, and the baffle plate 3 fixed in the closed tank 1. That is, the membrane separation means 2 is fixed to a hollow shaft 5 rotatably supported by a bearing 4, and the hollow shaft 5 has a large pulley 6, a V belt 7, and a small pulley 8.
It is configured to be driven by the motor 9 via. In FIG. 3, reference numeral 10 is a shaft sealing device, 11 is a rotary joint, and 12 is a base on which the sealed tank 1 and the motor 9 are mounted.

In the above structure, the stock solution is pumped from the stock solution inlet 13, and the permeate from the membrane separation means 2 is discharged to the outside of the apparatus through the hollow shaft 5 and the rotary joint 11. On the other hand, the concentrated liquid is discharged from the concentrated liquid outlet 14.

[0004]

However, in such a conventional structure, the relative speed (about 8 m / sec) between the membrane separation means 2 and the baffle plate 3 necessary for efficiently extracting the permeated liquid. In order to obtain the above, only the membrane separation means 2 was rotated, so there was the following problem. That is, as the stock solution is concentrated, the viscosity of the stock solution increases,
Since the membrane separation means 2 is rotated at a high speed in this liquid, much power is required. In addition, the membrane separation means 2 is operated at high speed (500 rp
Since the permeated liquid is rotated at about m), a centrifugal force is generated in the permeated liquid, and in order to overcome the centrifugal force and take out the permeated liquid, the pressure in the closed tank 1 must be increased. Therefore, the device itself becomes expensive.

An object of the present invention was made in view of the above problems, and it is an object of the present invention to provide a low-power and inexpensive membrane separation device.

[0006]

In order to achieve the above-mentioned object, a membrane separation device according to the present invention comprises a membrane separation means rotatably arranged in a closed tank and a membrane separation means arranged between the membrane separation means. , A rotatable baffle plate, and the baffle plate is configured to rotate at a higher speed than the membrane separation means.

[0007]

As described above, according to the present invention, the relative speed for efficiently extracting the permeate can be obtained by rotating the membrane separating means at a higher speed than the baffle plate, so that the power can be reduced. Further, since the membrane separating means is rotated at a speed lower than that of the baffle plate, the pressure in the closed tank for taking out the permeated liquid can be lowered, whereby the cost of the apparatus can be reduced.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 is a plan view showing an embodiment of the membrane separation device according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. A closed tank 21 and a motor 22 are mounted on the base 20. In addition, a rotatable membrane separating means 23 and a rotatable baffle plate 24 located between the membrane separating means 23 are arranged in the closed tank 21, and these membrane separating means 23, The baffle plate 24 is fixed to a hollow shaft 27 and a solid shaft 28 which are rotatably supported by bearings 25 and 26, respectively. An intermediate shaft 29 is disposed between the hollow shaft 27 on the membrane separating means 23 side and the solid shaft 28 on the baffle plate 24 side. The intermediate shaft 29 has a first shaft and a second shaft, respectively.
The gears 30 and 31 are fixed. The first gear 30
Has a smaller diameter than the second gear 31, and is in a state of always meshing with the third gear 32 fixed to the hollow shaft 27. On the other hand, the second gear 31 is the solid shaft 28.
It is always in mesh with the fourth gear 33 fixed to.

Further, the solid shaft 28 on the side of the baffle plate 24
A large pulley 34 is attached to one end side of the motor 22, and a small pulley 35 is attached to the drive shaft 22A side of the motor 22. The large pulley 34 and the small pulley 35 are attached.
A V-belt 36 is stretched between and. Further, shaft sealing devices 37 and 38 are attached to the hollow shaft 27 and the solid shaft 28 of the membrane separating means 23 and the baffle plate 24, respectively.

Next, the operation will be described. First, when the motor 22 is driven, the solid shaft 28 and the baffle plate 24 are rotated via the small pulley 35, the V belt 36, and the large pulley 34. On the other hand, the membrane separating means 23 is decelerated from the solid shaft 28 due to the meshing relationship between the fourth gear 33 and the second gear 31 and the meshing relationship between the first gear 30 and the third gear 32. In this state, that is, at a lower speed than the baffle plate 24.

The undiluted solution generated in the production process of foods, medicines, etc. is pumped into the closed tank 21 through the undiluted solution inlet 39, and the undiluted solution in the closed tank 21 is separated into the permeated liquid and the concentrated solution by the membrane separating means 23. It The permeated liquid is the hollow shaft 27.
And the concentrated liquid is discharged to the outside of the device through the rotary joint 41, while the concentrated liquid is discharged to the outside of the device from the concentrated liquid outlet 40. As described above, the undiluted solution in the closed tank 21 can always wash the membrane surface of the membrane separating means 23 by the turbulent flow generated by the relative speed between the membrane separating means 23 and the baffle plate 24, so that the undiluted solution is concentrated to the maximum. It becomes possible.

When the baffle plate is fixed as in the prior art, the outer peripheral portion of the membrane separating means has a higher peripheral speed, so that the separation effect is larger, but the peripheral speed becomes smaller as it approaches the hollow shaft, so the membrane separation effect is also smaller. Become. However, if both the membrane separating means 23 and the baffle plate 24 are rotated as in the present embodiment, a large relative speed can be obtained even on the hollow shaft 27 side of the membrane separating means 23, and the membrane separating effect is entirely achieved. It becomes big all over.

In the above embodiment, the membrane separating means 23 and the baffle plate 24 are both uniaxial. However, when the membrane separating apparatus is a larger one, the membrane separating means 23 side shaft is used. It is also possible to have a plurality of axes and the baffle plate 24 side to have a single axis. With such a configuration, it is possible to further reduce the required power per amount of permeated liquid.

[0014]

As described above, according to the membrane separation apparatus of the present invention, the baffle plate is configured to rotate at a higher speed than the membrane separation means, thereby obtaining the relative speed for efficiently extracting the permeate. This makes it possible to reduce the power as compared with the conventional case. Further, since the membrane separation means is configured to rotate at a lower speed than the baffle plate, the pressure in the sealed tank for taking out the permeated liquid can be lowered, so that the cost of the apparatus can be reduced as compared with the conventional one. There is also an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a membrane separation device according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing an example of a conventional membrane separation device.

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 21 closed tank 23 membrane separation means 24 baffle plate

Claims (1)

[Claims] 1. A membrane separation means rotatably arranged in a closed tank, and a rotatable baffle plate arranged between the membrane separation means. The baffle plate is provided from the membrane separation means. A membrane separation device characterized in that it is also configured to rotate at high speed.