JP2767690B2 - Filtration machine and filtration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter used for separating a solid content from a liquid to be treated and a filtration method using the filter.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A hollow rotary shaft rotatably provided in the container (2)
(3) and a plurality of hollow filter media (4) attached to the hollow rotary shaft (3), and the container (2) has a liquid inlet (5) and a drain outlet (6). And the hollow filter medium
(4) The inside communicates with the filtrate flow path (3A) formed inside the hollow rotary shaft (3) through the conduction hole (7),
The end (3B) of (3) is provided with a filtrate outlet (8), and the end (3B) is further provided with a coating tube extending from the end of the container (2).
(9), and a filtrate discharge passage (1)
0) is connected, and a pulley (1) is provided at the end of the hollow rotary shaft (3).
1), and a filter (1) is provided in which the pulley (11) is connected to a motor (not shown) via a belt (12) (Japanese Patent Application Laid-Open Nos. 53-37950 and 56-56). -5
No. 6772, JP-A-56-77270).

In order to perform filtration using the above-mentioned filter (1), the liquid to be treated is pressed into the vessel (2) from the liquid inlet (5), and is filtered by the hollow filter medium (4). The liquid to be treated is filtered, the filtrate is introduced from the inside of the hollow filter medium (4) into the filtrate flow path (3A) of the hollow rotary shaft (3) through the through-hole (7), and the filtrate is rotated in the hollow rotary medium (3). From the filtrate outlet (8) of the shaft (3), coat the cylinder (9)
To the filtrate discharge passage (10). In the above-mentioned filtration step, when solids (cake) contained in the liquid to be treated accumulate on the surface of the hollow filter medium (4) of the filter (1), press-in of the liquid to be treated is stopped, and Conversely, the washing liquid or the filtrate is discharged from the filtrate discharge path (10) connected to (9) to the hollow rotary shaft.
Press-fit into the hollow filter medium (4) through the filtrate channel (3A) of (3),
The filtrate is passed from the inside to the outside of the hollow filter medium (4), and the hollow filter medium is passed through the hollow rotary shaft (3) by a motor.
(4) Rotate. The cake thus accumulated on the surface of the hollow filter medium (4) is separated from the inside of the hollow filter medium (4) by pressing with a washing solution or a filtrate, and the cake is separated by centrifugal force caused by the rotation of the hollow filter medium (4). The cake accumulated on the surface of the hollow filter medium (4) is removed by shaking off the surface of the hollow filter medium (4).

[0004]

However, in the above conventional filter, the cake accumulated on the surface of the hollow filter medium is removed by the pressing force of the washing liquid or the filtrate and the centrifugal force caused by the rotation of the hollow filter medium (4). However, there is a problem that a large amount of the cake remains on the surface of the hollow filter medium (4) if the cake has a high tackiness.

[0005]

According to the present invention, as a means for solving the above-mentioned conventional problems, there is provided a container (22) and a rotatable pump (23F) rotatably provided in the container (22). Shaft (23)
When the brush in contact with the one or the two or more hollow filter medium (24), said hollow <br/> filter medium (24) attached to the container (22) in the surface attached to the rotating shaft (23) (25)
(22) is provided with a liquid to be treated inlet (26) and a drain outlet (27), and the hollow filter medium (24) is connected to a filter frame (24A) and the filter frame (24A).
Coated with which the filter cloth becomes from the (24B), the hollow filter medium (24)
Internal contact filtrate flow path of the rotary shaft (23) (23F), the filtrate channel of the rotary shaft (23) (23F) is to contact the filtrate discharge channel (33), said
Fluid pressure is set in the hollow filter medium (24) through the filtrate discharge passage (33).
To provide a filter (21) that is capable of exerting the same , further using the filter (21) and a container of the filter (21).
The liquid to be treated is pressure-fed from the liquid introduction port (26) into (22),
The該被treatment solution was filtered in a hollow filter medium (24), the filtrate is in the
It is introduced into the filtrate discharge passage (33) of the rotary shaft (23) from the inside of the empty filter medium (24), and discharged from the filtrate discharge port (23D) of the rotary shaft (23).
Cake accumulated on the hollow filter medium (24) surface C is the hollow filter medium (24)
Is rotated through the rotary shaft (23) Rutotomoni filtrate discharge channel (3
3) through the introducing fluid pressure into the hollow filtration material (24) within the fluid
The filter cloth (24B) of the hollow filter medium (24) is pressed by pressure to
The present invention provides a filtration method in which the brush (25) is scraped off by being pressed against the cloth (25).

[0006]

The liquid to be treated is pressed into the container (22) through the liquid inlet (26), and the liquid to be treated is filtered by the hollow filter medium (24). The filtrate flows from the hollow filter medium (24) to the filtrate channel (2) on the rotating shaft (23).
3F), and is further discharged from a filtrate discharge path (33) communicating with the filtrate flow path (23F), and solids contained in the liquid to be treated are converted into cakes on the surface of the hollow filter medium (24). To accumulate.
When the hollow filter medium (24) rotates the hollow filter medium (24) through the rotary shaft After filtration efficiency comes reduced clogged (23)
Both flow through the filtrate discharge passage (33) inside the hollow filter medium (24).
Exerts body pressure. Then the filter cloth (24B) of the hollow filter medium (24)
Is pushed from the inside of the hollow filter medium (24) by the fluid pressure.
The brush (25) is evenly pressed against the surface of the filter cloth (24B).
The cake C adhered to the filter cloth (24B)
Easily peeled al, filter cloth of the hollow filter medium (24) in this state (2
Since the brush in contact with the surface of the 4B) (25) is abraded surface of the filter cloth (24B), the cake that accumulated in the filtration fabric (24B) surfaces rubbing efficiently by the brush (25) Dropped.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 3. A filter (21) includes a container (22) and a rotatable rotatably provided in the container (22). Shaft (23) and the rotating shaft (2
3) a plurality of hollow filter media (24) attached to the filter, and a brush (25) in contact with the surface of the hollow filter media (24). The hollow filter media (24) has a filter as shown in FIG. Frame (24A) and the filter frame (24
A) and a filter cloth (24B) coated thereon.

The container (22) has a liquid inlet (26) having a valve (26A) and a drain outlet having a valve (27A).
(27), the rotating shaft (23) has a trifurcated cross section, the tip (23A) is a round bar, and the container (22) is rotatable with the bearing (28) at the front end. The rear end (23B) of the rotary shaft (23) is cylindrically supported, and a round bar-shaped root end (23C) is protruded from the end of the rear end (23B). End (23C)
Extends from the rear end of the container (22) and extends to the rear end (2
3B) is rotatably supported by a bearing (29) at the end of a coating cylinder (22A) that covers the coating cylinder (22A), and the root end (23C) of the rotating shaft (23) is out of the coating cylinder (22A), A pulley (30) is attached to the outside end, and the pulley (30) is connected to a motor (3) via a belt (31).
2), and a valve (33A)
The filtrate discharge path (33) having the following is connected. A filtrate outlet (23D) is provided at the rear end (23B) of the rotating shaft (23) in the coating tube (22A). A plurality of hollow filter media (24) are attached to the rotating shaft (23).
As shown in FIG. 2, (24) comprises a filter frame (24A) and a filter cloth (24B) coated on the filter frame (24A), and the filter cloth (24B) is preferably made of polyester fiber or polychlorinated fiber. Vinylidene fiber,
It is preferably made of a woven fabric of a thermoplastic fiber such as a polypropylene fiber or a polyamide fiber, and the surface is desirably smoothed by calendering in order to facilitate peeling of the cake adhering to the surface. The hollow filter medium (24) has a central hole (2
4C), the ring-shaped spacer (34) is interposed between the hollow filter media (24), and is fixed at the front end by a flange (35). The part is fixed by a flange (23E) of a rear end (23B) of the rotating shaft (23) and a spacer (36). In this way, the hollow filter medium (24) is fixed to the rotating shaft (23), but since the rotating shaft (23) has a forked cross section, the hollow filter medium (24) rotates with the center hole (24C) of the hollow filter medium (24). The filtrate flow path (23F) is formed hollow between the shaft (23).

The brush (25) includes a substrate (25A) and the substrate (25A).
A) A flocking layer (25B) formed on one side of the front and back surfaces of the substrate (25A), and is inserted into the upper portion of the container (22) through the hole (25D) of the head (25C) of the substrate (25A). It is supported by the fixed bar (37) being passed. The length of the flocked layer (25B) of the brush (25) is set so as to be in contact with the surface of the filter cloth (24B) of the hollow filter medium (24).

To perform filtration in the filter (21), first, the valve (27A) of the drain outlet (27) is closed, the valve (26A) of the liquid inlet (26) is opened, and the filtrate is further discharged. Road
The valve (33A) of (33) is opened, and the liquid to be treated is pressed into the container (22) from the liquid inlet (26). The liquid to be treated is filtered through the hollow filter medium (24) in the vessel (22), and the filtrate is passed along the filtrate flow path (23F) of the rotating shaft (23) as shown by the arrow in FIG. ) To the rear end (23B).
The filtrate is discharged from the filtrate discharge port (23D) of 3B) into the coating tube (22A) of the container (22), and discharged to the outside from the filtrate discharge passage (33).

During the above-mentioned filtration step, the solid content in the liquid to be treated adheres to the surface of the filter cloth (24B) of the hollow filter medium (24) as cake C, so that the filter cloth (24B) gradually becomes clogged. Filtration efficiency decreases. Therefore, at an appropriate time, the valve (26A) of the liquid to be treated inlet (26) is closed to stop the pumping of the liquid to be treated into the container (22), and the motor (32) is operated to rotate the rotating shaft (23).
A hollow filter medium (24) is rotated in the arrow direction as shown in FIG. 3 through Rutotomoni filtrate discharge channel (33) filtrate hollow filter medium (2
The fluid is fed back into 4) to exert fluid pressure in the hollow filter medium (24). so
Then, the filter cloth (24B) of the hollow filter medium (24 ) is caused by the fluid pressure.
Flooding of the brush (25) by being pushed from the inside of the hollow filter medium (24)
The layer (25B) is pressed uniformly to the layer (25B), and the cake C is pressed by the pressure.
Easily peeled off from the filter cloth (2 4B) Te, flocked layer of filter cloth surface of (24B) said brush (25) of the hollow filter medium (24) in this state (25
B) is abraded, efficiency good by the filter cloth as shown in FIG. 3 (cake C is plant hair layer adhering to the surface of 24B) (25B)
Ku is scraped off. In this case, the rotation speed of the hollow filter medium (24) is usually 3 to 5 rpm, and it is rotated about 2 to 4 times.

In this way, the filter cloth (24 ) of the hollow filter medium (24)
B) After removing cake C adhering to the surface with a brush (25), open the valve (27A) of the drain outlet (27), and
Filtration of the hollow filter medium (24) together with the liquid to be treated remaining in (22)
The cake C removed from the cloth (24B) surface is discharged to the outside,
Thereafter, the process returns to the filtration step. During the cake removal process, it may have been replaced the liquid to be treated in the container (22) to the wash water.

In addition to the above embodiment, as shown in FIG. 4, a substrate (45A, 45B) divided into two is used as a substrate of the brush (45).
A spacer (45C) may be interposed between the substrates (45A, 45A). When a brush (45) having such a structure is used, the brush
The flocked layer (45D) of (45) wears out and the filter cloth (24
B) If no longer press against the surface, the spacer (45C)
When is replaced with a thicker one, the flocked layer (45D) comes into pressure contact with the surface of the filter cloth (24B) of the hollow filter medium (24) again. The flocked layer (45D) of the brush (45) may be formed on the entire surface of the substrate (45A, 45A), but if formed on only one side as in the previous embodiment and this embodiment, the material of the flocked layer is reduced. You can save.

Further, in addition to the above embodiments, the hollow filter medium may be formed of a filter frame and a wire mesh coated on the filter frame, or may be made of a sintered body such as plastic beads, ceramic powder, metal powder, or the like. Is also good. The rotating shaft (43) may be a hollow shaft having a filtrate flow path (43A) formed therein. In this case, a filtrate passage hole (43B) is provided in the rotary shaft (43) at a position where the hollow filter medium (24) is attached. However, in this embodiment, the hollow filter medium (24)
It is necessary to perform the alignment between the rotary shaft and the filtrate passage hole (43B), and in the case of the rotating shaft (23) having a three-pronged cross section of the previous embodiment, such a labor of alignment is unnecessary. Further, in the filter of the present invention, the cake can be removed by rotating the filter medium during the filtration step.

[0015]

Accordingly, in the present invention, the hollow filter medium is used.
Press the filter cloth against the brush from inside with fluid pressure
In, filtrate cloth uniformly pressed against the brush, the frequency of the result can be substantially completely removed efficiently cake adhered to the filtration fabric <br/>, the frequency of the hollow filter medium washing and hollow filter medium exchange Can be greatly reduced, and filter cloths can be damaged
Regular abrasion can be avoided , and the filtration step can be performed very reasonably.

[Brief description of the drawings]

 1 to 3 show one embodiment of the present invention.

FIG. 1 is a side sectional view

FIG. 2 is a perspective view of a hollow filter medium mounting portion.

FIG. 3 is a front view of a hollow filter medium.

FIG. 4 is a perspective view of another embodiment of the brush.

FIG. 5 is a partial sectional view of another embodiment of the rotating shaft.

FIG. 6 is an explanatory view of a conventional example.

[Explanation of symbols]

21 Filtration machine 22 Container 23,43 Rotating shaft 23D Filtrate outlet 23F, 43A Filtrate flow path 24 Hollow filter medium 24A Filter frame 24B Filter cloth 25,45 Brush 26 Liquid to be treated inlet 27 Drain outlet 33 Filtrate outlet

Claims (2)

(57) [Claims] 1. A container, a rotating shaft rotatably inserted into the container and having a filtrate flow path, one or more hollow filter media mounted on the rotating shaft, and mounted in the container. is composed of a brush in contact with the hollow filter medium surface, the container is provided with the liquid to be treated inlet and drain outlet, intermediate
The empty filter medium comprises a filter frame and a filter cloth coated on the filter frame.
The inside of the hollow filter medium communicates with the filtrate flow path of the rotating shaft, the filtrate flow path of the rotating shaft communicates with the filtrate discharge path, and the inside of the hollow filter medium
Can apply fluid pressure through the filtrate discharge path
Filter characterized by the fact that 2. A container, a rotating shaft rotatably passed through the container and having a filtrate flow path, one or more hollow filter media mounted on the rotating shaft, and mounted in the container. is composed of a brush in contact with the hollow filter medium surface, the container is provided with the liquid to be treated inlet and drain outlet, intermediate
The empty filter medium comprises a filter frame and a filter cloth coated on the filter frame.
The inside of the hollow filter medium communicates with the filtrate flow path of the rotating shaft, the filtrate flow path of the rotating shaft communicates with the filtrate discharge path, and the inside of the hollow filter medium
Can apply fluid pressure through the filtrate discharge path
Using the filter machine which is the liquid to be treated is pumped from the treated liquid inlet port into the container of the filter machine and filtered該被processing solution in said hollow filter medium, the filtrate is the rotating from inside the hollow filter medium introduced into the axial filtrate discharge passage, and discharged from the filtrate outlet of the rotary shaft, the hollow filter medium surface on the accumulated cake through Rutotomoni filtrate discharge passage is rotated through the rotation axis of said hollow filter medium the
A fluid pressure is introduced into the hollow filter medium, and the fluid pressure causes the hollow
By pressing the filter medium filter cloth and pressing it against the brush,
Method characterized by scraping off with a brush