JPH08187407A - Filtration device and filtration - Google Patents

Abstract

PURPOSE: To remove a cake sticking to a filter medium efficiently and almost completely by making the filter medium installed in a container rotatable, and scraping the cake off the surface of the filter medium by causing a brush to come into contact with the surface of the filter medium and rotating the filter medium when the cake builds up. CONSTITUTION: A liquid to be treated is injected under pressure into a container 22 from an inlet 26 for the liquid to be treated, and is filtered using a hollow filter medium 24. The filtrate flows into the filtrate flow path 23F of a rotary shaft 23 from the hollow filter medium 24, then is discharged from a filtrate discharge passage 33 which communicates with the filtrate flow path 23F, and a solid contained in the liquid to be treated accumulates as a cake on the hollow filter medium 24. If the hollow filter medium 24 is clogged, to cause the deterioration of the filtration efficiency, the hollow filter medium 24 is rotated through the rotary shaft 23. Consequently, a brush 25 which comes into contact with the surface of the hollow filter medium 24 scrapes the surface of the hollow filter medium 24. Thus, the cake which accumulates on the surface of the hollow filter medium 24 is scraped off by the brush 25.

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. 6, a container (2) and a hollow rotating shaft (3) rotatably provided in the container (2).
And a plurality of hollow filter media (4) attached to the hollow rotating shaft (3).
(5) and a drain outlet (6) are provided, and the hollow filter medium (4)
The inside communicates with the filtrate flow path (3A) formed inside the hollow rotary shaft (3) through the through hole (7), and the filtrate drainage is provided at the end (3B) of the hollow rotary shaft (3). An outlet (8) is provided and the end (3
B) is covered by a covering cylinder (9) extending from the end of the container (2), the covering cylinder (9) is connected to a filtrate discharge passage (10), and the hollow rotary shaft (3) (1) is provided with a pulley (11), and the pulley (11) is provided with a filter (1) connected to a motor (not shown) via a belt (12) (JP-A-53-53). 37950, JP-A-56-5677
No. 2, JP-A-56-77270).

In order to carry out filtration using the above filter (1), the liquid to be treated is pressed into the container (2) through the liquid inlet (5) to be treated, and the hollow filter medium (4) is used to The liquid to be treated is filtered,
The filtrate is introduced into the filtrate flow path (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 discharged from the hollow rotary shaft (3). The filtrate is discharged from the outlet (8) through the covering cylinder (9) to the filtrate discharge passage (10). In the filtration step, when the solid content (cake) contained in the liquid to be treated is accumulated on the surface of the hollow filter medium (4) of the filter (1), the press-fitting of the liquid to be treated is stopped and the coated cylinder The washing liquid or the filtrate is reversed 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 exfoliated by pushing it from the inside of the hollow filter medium (4) with a washing liquid or a filtrate, and the cake is centrifugally generated 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 by the rotation of the hollow filter medium (4). However, there is a problem that a large amount of the cake is left on the surface of the hollow filter medium (4) if the cake has a high tackiness.

[0005]

[Means for Solving the Problems] As a means for solving the above-mentioned conventional problems, the present invention provides a container (22) and a rotation having a filtrate flow path (23F) rotatably delivered in the container (22). Axis (23)
, One or more hollow filter media (24) attached to the rotating shaft (23), and the filter media attached in the container (22)
(24) The container (22), which comprises a brush (25) contacting the surface
The treated liquid introduction port (26) and the drain discharge port (27) are provided in the hollow filter medium (24), and the inside of the hollow filter medium (24) has a filtrate flow path (23) of the rotary shaft (23).
F) and the filtrate flow path (23F) of the rotary shaft (23) provides a filter (21) connected to the filtrate discharge path (33), and further the filter (21) The liquid to be treated is pressure fed from the liquid to be treated inlet (26) into the container (22) of the filter (21) by using
In 4), the liquid to be treated is filtered, and the filtrate is introduced from the inside of the filter material (24) into the filtrate discharge passage (33) of the rotating shaft (23).
The cake C discharged from the filtrate discharge port (23D) of (23) and accumulated on the surface of the filter medium (24) is scraped off by a brush (25) by rotating the filter medium (24) through a rotary shaft (23). It provides a method.

[0006]

The liquid to be treated is pressed into the container (22) through the liquid inlet (26) to be treated, and the liquid to be treated is filtered by the hollow filter material (24). From the hollow filter medium (24) to the filtrate flow path (2) of the rotary shaft (23).
3F) and further discharged from the filtrate discharge path (33) communicating with the filtrate flow path (23F), and the solid content contained in the liquid to be treated is a surface of the hollow filter medium (24) as a cake. Accumulate in.
When the hollow filter medium (24) is clogged and the filtration efficiency is lowered, the hollow filter medium (24) is rotated through the rotary shaft (23).
Then, the brush that is in contact with the surface of the hollow filter medium (24)
Since (25) scrapes the surface of the hollow filter medium (24), the cake accumulated on the surface of the hollow filter medium (24) is scraped off by the brush (25).

[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 rotation rotatably provided in the container (22). The shaft (23) and the rotating shaft (23)
A plurality of hollow filter media (24) attached to the hollow filter media and a brush (25) in contact with the surface of the hollow filter media (24). 24A) and the filter frame (24A)
And a filter cloth (24B) coated on.

The container (22) has a liquid to be treated inlet (26) having a valve (26A) and a drain outlet (2) having a valve (27A).
7) is provided, the rotary shaft (23) has a three-pronged cross section, the tip (23A) is a round bar, and the bearing (28) at the front end of the container (22) is rotatably supported by a shaft. The rear end of the rotation shaft (23) is supported.
(23B) has a cylindrical shape, and further, a round bar-shaped root end (23C) is extended from the end of the rear end (23B), and the root end (23C) extends from the rear end of the container (22). The rear end portion (23) of the rotary shaft (23) that is extended
B) is rotatably supported by the bearing portion (29) of the end of the covering cylinder (22A), and the root end (23C) of the rotating shaft (23) goes out from the covering cylinder (22A). A pulley (30) is attached to the outgoing end, and the pulley (30) is connected to a motor (3) via a belt (31).
2) and the valve (33A) on the sheath (22A).
A filtrate discharge path (33) having a line is connected. A filtrate discharge port (23D) is provided at the rear end portion (23B) of the rotary shaft (23) in the covering cylinder (22A). A plurality of hollow filter media (24) are attached to the rotary 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 a polyester fiber or polychlorinated material. Vinylidene fiber,
It is preferably composed of a woven fabric of thermoplastic fibers such as polypropylene fibers and polyamide fibers, and the surface is preferably smoothed by calendering in order to facilitate the peeling of the cake adhering to the surface. The hollow filter medium (24) has a central hole (2
4C) is attached to the rotary shaft (23), but a ring-shaped spacer (34) is interposed between the hollow filter media (24), and is fixed by a flange (35) at the front end, The part is fixed by a flange (23E) and a spacer (36) at the rear end (23B) of the rotary shaft (23). In this way, the hollow filter medium (24) is fixed to the rotary shaft (23), but since the rotary shaft (23) has a three-pronged cross section, the hollow filter medium (24) and the central hole (24C) are rotated. A filtrate channel (23F) is formed between the shaft (23) and the shaft (23) in a hollow state.

The brush (25) is a substrate (25A) and the substrate (25A)
It is composed of a flocked layer (25B) formed on one side of the front and back sides of the container (22A) and is transferred to the upper part of the container (22) through the hole (25D) of the head (25C) of the substrate (25A). It is supported by a fixed rod (37). The length of the flocked layer (25B) of the brush (25) is set so as to come into pressure contact with the surface of the filter cloth (24B) of the hollow filter medium (24).

In order to carry out filtration in the above filter (21), first, the valve (27A) of the drain discharge port (27) is closed, the valve (26A) of the liquid to be treated introduction port (26) is opened, and the filtrate is further discharged. Road
The valve (33A) of (33) is opened, and the liquid to be treated is press-fitted into the container (22) from the liquid to be treated inlet (26). The liquid to be treated is filtered by the hollow filter medium (24) in the container (22), and the filtrate is fed along the filtrate channel (23F) of the rotary shaft (23) as shown by the arrow in FIG. ) To the rear end (23B),
It is discharged from the filtrate discharge port (23D) of 3B) into the covering cylinder (22A) of the container (22), and then discharged from the filtrate discharge path (33) to the outside.

During the 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. The filtration efficiency is decreasing. Therefore, at the appropriate time
The valve (26A) of (26) is closed to stop the pressure-feeding of the liquid to be treated into the container (22), and the motor (32) is operated to move the hollow shaft through the rotary shaft (23) as shown in FIG. Rotate the filter medium (24) in the direction of the arrow. 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 the cake C adhering to the surface of the brush (25) is the flocked layer as shown in FIG. Scrubbed by (25B). In this case, the number of rotations 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 discharge port (27) is opened and the inside of the container (22) is opened. The cake C removed from the surface of the hollow filter medium (24) is discharged to the outside together with the liquid to be treated remaining in the above, and thereafter the process proceeds to the filtration step again.
During the cake removing step, the filtrate may be sent back from the filtrate discharge passage (33) into the hollow filter medium (24) and the cake C may be pushed from the inside of the filter cloth (24B) by the filtrate, or the container ( The liquid to be treated in 22) may be replaced with washing water.

Other than the above embodiment, as shown in FIG.
As the substrate of (45), two divided substrates (45A, 45B) may be used, and a spacer (45C) may be sandwiched between the substrates (45A, 45A).
When the brush (45) having such a structure is used, the brush (45)
When the flocked layer (45D) of No. 1 is worn out and is no longer pressed against the surface of the hollow filter medium (24), the flocked layer (45D) is replaced by a thicker one, and the flocked layer (45D) is again pressed into the hollow filter medium (24). It comes into pressure contact with the surface. The flocked layer (45D) of the brush (45) may be formed on the entire surface of the substrate (45A, 45A), but if it is formed on only one side as in the previous example and this example, the material of the flocked layer is You can save.

Further, in addition to the above embodiments, the hollow filter medium comprises a filter frame,
It may be composed of a wire mesh coated on the filter frame,
Alternatively, a sintered body such as plastic beads, ceramic powder, or metal powder may be used as the material. Further, the rotating shaft (43) may be a hollow shaft in which the filtrate channel (43A) is formed. In this case, a filtrate passage hole is provided at the position where the hollow filter medium (24) is attached to the rotary shaft (43).
(43B) will be provided. However, in this embodiment, it is necessary to align the hollow filter medium (24) and the filtrate passage hole (43B), and in the case of the rotary shaft (23) having a three-pronged cross section in the previous embodiment, such alignment labor is required. Is unnecessary. Furthermore, in the filter of the present invention, it is possible to remove the cake by rotating the filter medium during the filtration step.

[0015]

Therefore, in the present invention, the cake adhering to the filter medium can be almost completely removed, and the frequency of filter medium washing and the frequency of filter medium exchange can be greatly reduced.
The filtration process can be carried out very reasonably.

[Brief description of drawings]

 1 to 3 show an embodiment of the present invention.

1] Side sectional view

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

[Fig. 3] Front view of 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 diagram of a conventional example.

[Explanation of symbols]

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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B01D 29/38 550 C

Claims (2)

[Claims] 1. A container, a rotary shaft that is rotatably provided in the container and has a filtrate flow path, one or more hollow filter media attached to the rotary shaft, and an interior of the container. And a brush in contact with the surface of the filter medium, the container is provided with an inlet for a liquid to be treated and a drain outlet, and the inside of the hollow filter medium communicates with the filtrate flow path of the rotary shaft, Filtrate flow path communicates with filtrate discharge path 2. A container, a rotary shaft that is rotatably provided in the container and has a filtrate flow path, one or more hollow filter media attached to the rotary shaft, and the interior of the container. And a brush in contact with the surface of the filter medium, the container is provided with an inlet for a liquid to be treated and a drain outlet, and the inside of the hollow filter medium communicates with the filtrate flow path of the rotary shaft, The filtrate flow path uses a filter connected to the filtrate discharge path, and pressure-feeds the liquid to be treated from the liquid to be treated inlet into the container of the filter,
The liquid to be treated is filtered in the filter medium, the filtrate is introduced into the filtrate discharge passage of the rotary shaft from the inside of the filter medium, discharged from the filtrate discharge port of the rotary shaft, and the cake accumulated on the surface of the filter medium rotates the filter medium. Filtration method characterized by rotating through a shaft and scraping off with a brush