JP2700624B2 - 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 solids 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. 9, a container (2) and a hollow rotary shaft (3) rotatably provided in the container (2).
And a plurality of hollow filter media (4) attached to the hollow rotary shaft (3).
(5) and a drain outlet (6) are provided, and the hollow filter medium (4) is provided.
The inside communicates with the filtrate flow path (3A) formed inside the hollow rotary shaft (3) through the through hole (7), and the filtrate is discharged to the end (3B) of the hollow rotary shaft (3). An outlet (8) is provided and the end (3
B) is covered with a coating tube (9) extending from the end of the container (2), a filtrate discharge passage (10) is connected to the coating tube (9), and the hollow rotary shaft (3 ) Are provided with a pulley (11), which is connected to a motor (not shown) through a belt (12) to provide a filter (1). No. 37950, JP-A-56-5677
No. 2, 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 introduction port (5), and is filtered by the hollow filter medium (4). Filter the liquid to be treated,
The filtrate is introduced into the filtrate channel (3A) of the hollow rotary shaft (3) from the inside of the hollow filter medium (4) through the through-hole (7), and the filtrate is drained from the hollow rotary shaft (3). The liquid is discharged from the outlet (8) to the filtrate discharge passage (10) through the coating tube (9). 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 solution or the filtrate is discharged from the filtrate discharge passage (10) connected to (9) to the hollow rotary shaft (3).
Through the filtrate channel (3A) into the hollow filter medium (4), and the filtrate is passed from the inside to the outside of the hollow filter medium (4) by a motor through the hollow rotary shaft (3). The hollow filter medium (4)
To 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 rotatably provided with a filtrate flow path (23F) in the container (22). Shaft (23)
And one or more hollow filter media (24) mounted on the rotating shaft (23), and a brush (25) mounted in the container (22) and interposed between the hollow filter media (24). The hollow filter medium (24) comprises a hollow filter frame (24A) and a filter cloth (24B) coated on the hollow filter frame (24A). (26) and a drain outlet (27) are provided, and the inside of the hollow filter medium (24) communicates with the filtrate flow path (23F) of the rotating shaft (23),
The filtrate flow path (23F) of the rotating shaft (23) provides a filter (21) communicating with a filtrate discharge path (33) and an air supply path (33), and the brush (25) is provided in the container. (22) The upper part is attached to a fixed rod (37) passed in the front-rear direction so as to be slidable back and forth and not to vibrate around the fixed rod (37), and furthermore, the rotating shaft (23)
A hollow filter medium (24) is attached via a spacer (34) made of an elastic body, and a filter medium pressing plate (35) is screwed to the tip (23A) of the rotating shaft (23). The hollow filter medium (24) provides a filter (21) which is fastened and fixed via the spacer by the filter medium holding plate (35).
The liquid to be treated is introduced into the container (22) of the filter (21) using (21).
The liquid to be treated is pumped from (26), and the liquid to be treated is filtered in the hollow filter medium (24), and the filtrate is supplied from the inside of the hollow filter medium (24) to the filtrate discharge path (33) of the rotating shaft (23). And then discharged from the filtrate discharge port (23D) of the rotating shaft (23).
B) The cake C accumulated on the surface of the hollow filter medium (24)
3), and at the same time, pressurized gas is sent into the hollow filter medium (24) from the air supply path (33), and the filter cloth (24) of the hollow filter medium (24) is
B) is pressed against the brush (25) by swelling, and a filtration method for scraping off the brush (25) is provided.

[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) is clogged and the filtration efficiency decreases, the hollow filter medium (24) is rotated through the rotary shaft (23) and the rotary shaft (23) is rotated from the air supply path (33). The pressurized gas is sent into the hollow filter medium (24) through the filtrate channel (23F). Then, the filter cloth (24B) of the hollow filter medium (24) is swelled by the pressurized gas and pressed against the brush (25). Then the hollow filter medium (2
As the brush (25) in contact with the surface of (4) rubs the surface of the hollow filter medium (24), the cake accumulated on the surface of the hollow filter medium (24) is pushed from the inside by the pressurized gas and the Scrubbed by brush (25).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. A filter (21) includes a container (22) and a rotatable rotatably provided in the container (22). Shaft (23), the rotating shaft (23)
And a brush (25) in contact with the surface of the hollow filter medium (24), the hollow filter medium (24) being a hollow filter frame as shown in FIG. (24A) and a filter cloth (24B) coated on the hollow filter frame (24A).

The container (22) has a liquid inlet (26) having a valve (26A) and a drain outlet (2) having a valve (27A).
7), the rotating shaft (23) has a trifurcated cross section, and a tip (23A) is formed in a round screw rod shape, and is rotatable by a bearing (28) at the front end of the container (22). 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 (23
C) is rotatably supported by a bearing (29) at the end of a coating cylinder (22A) extending from the rear end of the container (22) and covering the rear end (23B) of the rotating shaft (23). The root end (23C) of the rotating shaft (23) is protruded from the coating tube (22A), and a pulley (30) is attached to the protruding end, and the pulley (30) is connected via a belt (31). It communicates with the motor (32), and the valve (3
3A) is in communication with the filtrate discharge path and air supply path (33),
A pressure air introduction path (39) with a blower (38) interposed is connected to the filtrate discharge path / air supply path (33). And the coating tube (22
In (A), a filtrate outlet (23D) is provided at the rear end (23B) of the rotating shaft (23). A plurality of hollow filter media (24) are attached to the rotating shaft (23).
Is a hollow filter frame (24A) and the hollow filter frame (24A) as shown in FIG.
And a filter cloth (24B) covered with the filter cloth (24B).
Is preferably made of a woven fabric of thermoplastic fiber such as polyester fiber, polyvinylidene chloride fiber, polypropylene fiber, polyamide fiber, etc., and the surface is smoothed by calendering to facilitate peeling of the cake adhered to the surface. Is desirable. The hollow filter medium (24) is attached to the rotating shaft (23) through a center hole (24C). A spacer (34) is interposed and the rotating shaft
A filter medium pressing plate (35) is screwed to the tip (23A) of (23), and the hollow filter medium (24) is fixed to the spacer (3) by the filter medium pressing plate (35).
4), and the rear end is fixed by a flange (23E) of the rear end (23B) of the rotating shaft (23) and a spacer (36) made of an elastic material such as hard rubber or elastomer. ing. 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) comprises a substrate (25A) and the substrate (25A)
And a flocked layer (25B) formed on one side of the front and back surfaces of the substrate (25A) and passed through the hole (25D) of the head (25C) of the substrate (25A) to the upper portion in the container (22). Fixed rod (37). The length of the flocked layer (25B) of the brush (25) is set so as to be pressed against the surface of the filter cloth (24B) of the hollow filter medium (24).

In the filter (21), in order to mount the hollow filter medium (24) and the brush (25), first, the rearmost hollow filter medium (2) is attached.
4) is attached to the rotating shaft (23), then the spacer (34) is attached, the brush (25) is attached to the fixing rod (37), and this procedure is repeated several times. (23A), and fix the filter medium holding plate (35) by screwing.
The (24) and the spacer (34) are pressed together to seal the filtrate channel (23F) formed therein.

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 discharged. The valve (33A) of the passage / air supply passage (33) is opened, and the liquid to be treated is pressed into the container (22) from the liquid introduction port (26). The liquid to be treated is filtered through the hollow filter medium (24) in the vessel (22), and the filtrate is filtered on the rotary shaft (23) as shown by the arrow in FIG.
(23F) to the rear end (23B) of the rotating shaft (23), and from the filtrate outlet (23D) at the rear end (23B), the coating tube of the container (22).
(22A) and then to the outside through the filtrate discharge path and air supply path (33).

During the filtration step, the solids in the liquid to be treated adhere 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 the appropriate time,
The valve (26A) of (26) is closed to stop the pumping of the liquid to be treated into the container (22), and the valve (3) of the filtrate discharge path and air supply path (33) is further closed.
3A) is closed, the motor (32) is operated, the hollow filter medium (24) is rotated in the direction of the arrow through the rotary shaft (23) as shown in FIG. 4, and the blower (38) is operated to release the compressed air. When the air is introduced into the hollow filter medium (24) from the pressure air introduction path (39) through the filtrate discharge path and the air supply path (33), the filter cloth (24B) of the hollow filter medium (24)
3 is pushed by the pressurized air and swells as shown by the arrow in FIG. Then, the surface of the filter cloth (24B) of the hollow filter medium (24) is rubbed by the flocked layer (25B) of the brush (25), and as shown in FIG. It is pushed from the inside and scraped off by the flocking layer (25B). 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.

After the cake C adhering to the surface of the hollow filter medium (24) is removed by the brush (25) in this way, the valve (27A) of the drain outlet (27) is opened to open the container (22). The cake C removed from the surface of the hollow filter medium (24) together with the liquid to be treated remaining in the filter is discharged to the outside and the blower (38) is stopped, and thereafter, the process returns to the filtration step.

In the above embodiment, the flocked layer of the brush (25)
(25B) may be formed on the entire surface of the substrate (25A),
If it is formed on only one side, the material of the flocking layer can be saved.

As shown in FIG. 5, the brush (25) is fixed to the fixing rod (37).
When the hollow filter medium (24) is rotated, a space is provided between the heads (25C) of the adjacent brushes (25), and as shown by the arrow in FIG. You may make it slide back and forth along. In this case, the head (25C) of the brush (25) is brought into contact with the upper surface of the container (22) as shown in FIG.
The left-right vibration of the brush (25) as shown by the arrow in FIG. 6 is prevented. When the brush (25) is mounted so that it can slide slightly back and forth along the fixing rod (37) in this manner, the spacer (3) is used when the hollow filter medium (24) is tightened and fixed by the filter medium pressing plate (35).
Due to the elastic deformation (compression) of 4), the hollow filter medium (24) is pushed rearward, and the brush (25) moves correspondingly rearward.

In order to prevent the lateral vibration of the brush (25), in addition to the above embodiment, a frame (40) having a U-shaped cross section is fixed to the upper surface of the container (22) as shown in FIG. Brush (2) on frame (40)
The head (25C) of 5) may be fitted, or a frame having an L-shaped cross section may be used instead of the frame (40) having a U-shaped cross section, or two fixing rods may be used. .

In addition to the above embodiment, as shown in FIG. 8, the rotary shaft (43) may be a hollow shaft having a filtrate flow path and an air supply path (43A) formed therein. In this case, the hollow filter medium of the rotating shaft (43)
(24) Provide a filtrate passage hole (43B) at the mounting position. However, in the present embodiment, it is necessary to align the hollow filter medium (24) with the filtrate passage hole (43B). In the case of the rotary shaft (23) having a three-pronged cross section of the previous embodiment, such alignment is troublesome. Is unnecessary. Further, in the filter of the present invention, the cake can be removed by rotating the filter medium during the filtration step.

[0018]

According to the present invention, the cake attached to the filter medium can be almost completely removed, and the frequency of washing the filter medium and the frequency of replacing the filter medium can be greatly reduced.
The filtration step can be performed very reasonably.

[Brief description of the drawings]

 1 to 4 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 an explanatory view of a swelling state of a filter cloth.

FIG. 4 is a front view of a hollow filter medium. FIGS. 5 and 6 show another embodiment of the present invention.

FIG. 5 is a cutaway side view of a brush attachment part.

FIG. 6 is a front view of a brush mounting part.

FIG. 7 is a front view of another embodiment of the brush attachment portion.

FIG. 8 is a partial sectional view of another embodiment of the rotating shaft.

FIG. 9 is an explanatory view of a conventional example.

[Explanation of symbols]

 21 Filtration machine 22 Container 23,43 Rotating shaft 23A Tip 23D Filtrate outlet 23F, 43A Filtrate channel 24 Hollow filter medium 24A Hollow filter frame 24B Filter cloth 25,45 Brush 26 Liquid inlet 27 Drain outlet 33 Filtrate discharge Channel and air supply path 34 Spacer 35 Filter media holding plate 37 Fixing rod

Claims (3)

(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. And a brush interposed between the hollow filter media, and the hollow filter media includes a hollow filter frame and a filter cloth coated on the hollow filter frame. Wherein the inside of the hollow filter medium communicates with a filtrate flow path of the rotary shaft, and the filtrate flow path of the rotary shaft communicates with a filtrate discharge path and an air supply path. 2. The brush is mounted on a fixed rod extending in the front-rear direction inside the container so as to be slidable back and forth and not to vibrate around the fixed rod. The filter medium is attached via a spacer made of an elastic body, and a filter medium pressing plate is screwed to the tip of the rotating shaft,
The filter according to claim 1, wherein the hollow filter medium is fastened and fixed by the filter medium pressing plate via the spacer. 3. 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. And a brush interposed between the hollow filter media, and the hollow filter media includes a hollow filter frame and a filter cloth coated on the hollow filter frame. The inside of the hollow filter medium communicates with the filtrate flow path of the rotary shaft, and the filtrate flow path of the rotary shaft uses a filter that communicates with a filtrate discharge path and an air supply path. The liquid to be treated is pressure-fed from the liquid inlet to be treated into the container, the liquid to be treated is filtered in the hollow filter medium, and the filtrate is introduced from the inside of the hollow filter medium to the filtrate discharge path of the rotating shaft, The cake discharged from the filtrate outlet and accumulated on the surface of the filter cloth of the hollow filter medium is passed through the hollow filter medium via a rotating shaft. The pressurized gas from the gas feed path causes a rolling through feed into the hollow filter medium, allowed pressed against the brush by allowed to bulge the filter cloth of the hollow filter media, filtration wherein the to scraping by the brush