JP2750655B2 - Rotary filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary filtration device for separating and concentrating cells and the like using a microfiltration membrane or an ultrafiltration membrane, which is provided in the rotary filtration device. The present invention relates to an improvement of a rotary filtration device provided with a cleaning tool for cleaning a membrane surface of a filtration element.

[0002]

2. Description of the Related Art Conventionally, as this kind of rotary filtration device, there is a device disclosed in Japanese Utility Model Laid-Open No. 3-11428 by the present applicant, for example.

That is, in this conventional apparatus, as shown in FIG. 4, a plurality of filtration elements 6a having a membrane surface 7a are pivotally supported on a drive shaft 4b disposed in a filtration tank 1a. In the meantime, the base end of the cleaning brush 18 is loosely inserted into the drive shaft 4b to clean the film surface 7a.

Further, a stopper 14a for stopping rotation of the cleaning brush 18 for cleaning the membrane surface 7a of the filtration element 6a is disposed near the inner peripheral surface of the filtration tank 1a. The rotating shaft 15a includes a plurality of protrusions 16a protruding from the outer peripheral surface of the rotating shaft 15a. The protrusions 16a are shifted in phase by 90 ° from one end, an intermediate portion, and the other end of the rotating shaft 15a. Is provided.

At the time of washing, the frequency of the drive shaft 4b is reduced by the frequency converter 19 and the protrusion 16 of the rotary shaft 15a is removed.
a so as to engage the tip of the cleaning brush 18.
is rotated and stopped by 90 °, and the membrane surface 7a of the filter element 6a is sequentially washed.

[0006]

However, in the prior art, the rotating shaft 15a needs to be accurately rotated and stopped in order to engage the projection 16a of the stopper 14a with the cleaning brush 18, for example, the rotating shaft 15a. When the rotation drive is performed by an electric motor, a means for detecting the protrusion 16a, a control means for the electric motor, and the like are separately required, and thus the configuration of the entire apparatus becomes very complicated.

In addition, the cleaning of the membrane surface 7a is performed in a step separate from the filtering operation, and at the time of such cleaning, the number of rotations of the drive shaft 4a is reduced. However, it also had the disadvantage of lacking workability.

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned conventional problems, and aims at simplifying the whole apparatus and efficiently performing a series of operations such as filtration and washing. As an issue.

[0009]

That is, in order to solve the above-mentioned problems, the present invention provides a rotary drive shaft 4 disposed in a filtration tank 1.
In addition, a filter element 6 having a membrane surface 7 for filtering the liquid to be treated and a cleaning tool 11 disposed between the filtration elements 6 for cleaning the membrane face 7 are provided, respectively. And a rotation shaft for stopping the rotation with respect to the filter element 6.
In a rotary filtration device in which a stopper 14 having a projection 16 on the outer peripheral surface of 15 is provided in the filtration tank 1, filtration with the membrane surface 7 of the filter element 6 and cleaning of the membrane surface 7 with the cleaning tool 11 are performed. as the be performed simultaneously, less the in a different rotational speed rotary drive shaft 4 by a rotary shaft 15 is drive means of the stopper 14
It is a rotary filtration device that is controlled so as to rotate continuously at least once .

[0010]

[Action] Therefore, in the rotary filtration device, wherein the configuration, the rotating the rotary drive shaft 4 is filtered element 6 is to rotate together with associated cleaning tools 11, driving the rotation <br Since the number of rotations of the moving shaft 4 and the rotating shaft 15 of the stopper 14 is different, the cleaning tool 11 is appropriately engaged with the projection 16 of the stopper 14 and the rotation thereof is stopped. The membrane surface 7 of the rotating filter element 6 is cleaned.

[0011]

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

In FIG. 1, reference numeral 1 designates a cylindrical filtration tank which is placed horizontally, and an opening / closing lid (not shown) is provided on a circumferential side of the tank.
Are provided to be freely opened and closed. Reference numeral 2 denotes a liquid supply port provided on one side surface of the filtration tank 1, and reference numeral 3 denotes a discharge port provided at a lower portion of the circumferential surface.

Reference numeral 4 denotes a hollow rotary drive shaft rotatably mounted on both sides of the filtration tank 1 so as to cross substantially the center of the filtration tank 1.
At one end thereof, a discharge port 4a is provided, and the rotary drive shaft 4 is rotationally driven by an electric motor 5.

Reference numeral 6 denotes a disc-shaped filter element having a membrane surface 7 on both sides and a through-flow port 8 for liquid to be treated formed in the center portion. An inner chamber 9 formed in the filter element 6 has it is passed through with the interior of the rotary drive shaft 4 via a plurality of pipes 10 which arranged in the mouth 8, a plurality of filtration elements 6 times made of such structure
It is fixed to the rolling drive shaft 4 with a predetermined interval.

Numeral 11 denotes a cleaning tool disposed between the filtration elements 6 for cleaning the membrane surface 7 of the filtration element 6, the base end of which is loosely inserted into the rotary drive shaft 4 and the tip end thereof. A rod-shaped body 12 is protruded from the portion, and the cleaning tool 11 has a detachable cleaning brush 13.

Reference numeral 14 denotes a stopper for stopping the cleaning tool 11. The stopper 14 is located at the lower central position of the filtration tank 1.
A rotary shaft 15 arranged in parallel with the rotary drive shaft 4 and three protrusions 16 protruding from one end, intermediate portion and the other end of the rotary shaft 15 with a phase shift of 90 ° as shown in FIG. The tip of the rod 12 of the cleaning tool 11 is engaged with the projection 16 so that the rotation of the cleaning tool 11 is stopped with respect to the filter element 6 . Reference numeral 17 denotes an electric motor provided at one end of the rotating shaft 15 so as to constantly drive the rotating shaft 15. The rotating speed of the rotating shaft 15 is 2/3 rpm.
The rotation speed of the rotary drive shaft 4 is controlled to 6 rpm.

The rotary filtration device according to the present embodiment has the above-described configuration. Next, an example of use of such a device will be described.

[0018] First, the liquid to be treated to be filtered from the supply port 2 of the filtration tank 1 after pressure supply, to start the motor 5 and 17 times
When the rotary drive shaft 4 and the rotary shaft 15 are driven to rotate, the liquid to be treated comes into contact with the membrane surface 7 of the filtration element 6 and is filtered.
The permeated liquid having passed through the filter element 6 is discharged from the inner chamber 9 of the filtration element 6 to the outside through the discharge port 4 a via the pipe 10 and the rotary drive shaft 4, and the processing liquid concentrated by the filtration is appropriately discharged from the filtration tank 1. It is discharged from the discharge port 5 to the outside.

In this case, since the rotation speeds of the rotation shaft 15 and the rotation drive shaft 4 are different, the projection 16 of the rotation shaft 15 and the rod-shaped body 12 of the predetermined cleaning tool 11 are moved during the filtering operation. When properly engaged, the rotation of the cleaning tool 11 stops with respect to the filter element 6 , and thus fine particles and the like adhered to the membrane surface 7 of the filter element 6 rotated by the cleaning brush 13. Is removed and washing is performed.

Since the rotary shaft 15 may be continuously rotated together with the rotary drive shaft 4, it is not necessary to provide a separate control means for controlling the rotation and the stop operation of the rotary shaft 15, so that the entire apparatus is not required. Simplification can be achieved.

Further, since the washing operation can be performed while performing the filtering operation, and there is no need to reduce the number of rotations of the rotary drive shaft 4 as in the prior art, the efficiency of a series of operations can be improved.

The rotation of the rotation shaft 15 causes the protrusion 16
The cleaning tool 11 released from the engagement state with the filter element 6 rotates again with the filter element 6.

Then, the removed deposits are re-suspended in the liquid to be treated in the filtration tank 1, and the liquid to be treated, in which the suspended concentration of the fine particles has increased, is discharged to the outlet of the filtration tank 1 as described above. Exhausted from 5

In the above embodiment, the stopper 14
Although three projections 16 are provided on the rotating shaft 15 of the above, the specific number thereof can be arbitrarily changed according to the type of the liquid to be treated and the like. Alternatively, it may be provided on a part of the rotating shaft 15 or over the entire length. With this configuration, the rods 12 of the cleaning tool 11 are engaged with the projections 16 of the stopper 14 one by one, so that there is an advantage that an impact at the time of such engagement is suppressed.

Further, the rotary shaft 15 does not necessarily have to be continuously rotated as the above embodiment, another may be washed with filtered is rotated after a predetermined time has elapsed, the rotary drive shaft rotation speed of the rotary shaft 15 4 It may be set to be larger than that of the above, and its specific use mode does not matter.

In addition, the specific structure of each part of the rotary filtration device can be freely changed within the range intended by the present invention.

[0027]

[Effect of the Invention] As on ordination, the present invention is low in rotational speed different from the rotational drive shaft by a drive means axis of rotation of the stopper
Kutomo 1 for controlled to rotate above can be continuously rotated comprising, cleaning tool that rotates with filtration element by a rotary drive shaft rotating the both the rotation of the appropriate engagement with the projection of the stopper the cleaning tool The filter element is stopped, and the film surface of the rotating filter element is cleaned by the stopped cleaning tool.

Therefore, it is not necessary to rotate and stop the rotating shaft in order to stop the cleaning tool at the time of washing as in the prior art. Therefore, there is no need to detect the protrusion of the stopper or control means for controlling the operation of the rotating shaft. As a result, a special effect that the configuration of the entire apparatus can be simplified is obtained.

Further, since the rotating shaft and the rotating drive shaft are continuously rotated, the washing operation can be performed while performing the filtering operation, and the number of rotations of the rotating drive shaft at the time of washing is reduced as in the conventional case. This eliminates the necessity, and thus has an operational effect that a series of operations can be performed more efficiently than before.

[Brief description of the drawings]

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

FIG. 2 shows an embodiment of the stopper, wherein (a) is a front view and (b) is a side view.

FIG. 3 shows another embodiment of the stopper, wherein (a) is a front view and (b) is a side view.

FIG. 4 is a front sectional view showing a conventional rotary filtration device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filtration tank 4 ... Rotation drive shaft 6 ... Filtration element 7 ... Membrane surface 11 ... Cleaning tool 14 ... Stopper 15 ... Rotation shaft 16 ... Protrusion

Claims (2)

(57) [Claims] 1. A rotary drive shaft (4) disposed in a filtration tank (1).
A filtration element (6) having a membrane surface (7) for filtering the liquid to be treated, and a cleaning tool (11) arranged between the filtration element (6) to clean the membrane surface (7). Are provided respectively, and the cleaning tool (11)
A stopper (14) having a projection (16) on the outer peripheral surface of the rotating shaft (15) is provided in the filtration tank (1) so as to engage with the filter element and stop the rotation with respect to the filtration element (6). Filtration by the membrane surface (7) of the filtration element (6)
As the cleaning of the membrane surface by cleaning equipment (11) (7) may be carried out simultaneously, the rotation shaft of the stopper (14) (15) the rotary drive shaft by the driving means (4) and at least one rotation at different rotational speed Less than
A rotary filtration device controlled to rotate continuously upward . 2. The rotary filtration device according to claim 1, wherein said projections (16) are formed in a spiral shape along the axial direction of the rotary shaft (15).