JPH1033914A - Liquid filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging of the filter cylinder of a liquid filter. SOLUTION: A vertical rotary shaft 31 is arranged to the axial center of a vertical cylindrical body 21 and upper and lower horizontal disc-shaped turntables 34, 35 are fixed to the rotary shaft 31. Filter cylinders 41 are rotated around the axes of them while the rotary shaft 31 is rotated. A raw soln. to be filtered is introduced into the cylinder 41 from the upper side of the upper turntable 34. The filtrate passed through the filter cylinders is led out of the gap between the upper and lower turntables 34, 35 within the cylinder 21. The unfiltered liquid not passed through the filter cylinders 41 is discharged out of the lower end port of the filter cylinders 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a liquid filtration device,
For example, the present invention relates to an apparatus for filtering sewage containing iron powder, coal, and the like discharged from an ironworks and muddy water caused by civil engineering work to about industrial water.

[0002]

2. Description of the Related Art Conventionally, various types of apparatuses such as a filter press and a centrifugal drum type dehydrator have been used for this kind of application.

[0003]

In the above-mentioned conventional apparatus,
Since both types are easily clogged,
It was necessary to clean or replace the filter tube in a short time, which was troublesome.

[0004] It is an object of the present invention to provide a liquid filtering apparatus in which a filter cylinder is hardly clogged.

[0005]

SUMMARY OF THE INVENTION A liquid filtration apparatus according to the present invention comprises a filter tube having a vertical axis, revolving means for rotating the filter tube around a vertical line separated by a predetermined distance from its own axis, and a filter. Rotation means for rotating the cylinder about its own axis, introduction means for introducing the undiluted solution to be filtered into the upper end opening of the filtration cylinder, filtrate which has passed through the filtration cylinder and unfiltered discharged from the lower end opening of the filtration cylinder Preventing means for preventing mixing of liquids.

In the liquid filtration apparatus according to the present invention, the liquid in the filter cylinder is rotated by the rotation means while receiving the centrifugal force caused by the revolution of the revolving means. Even if a filter block that cannot pass through the filter tube adheres, the filter block is separated from the inner surface of the filter tube when the attached filter block faces in a direction opposite to the direction of the centrifugal force.
Therefore, the filter tube is not clogged with the filter cake.

[0007] It is preferable that a separating section not allowing the undiluted solution and a filtering section allowing the undiluted solution to pass are provided above and below the filter tube.

In the separation section, the filter cake and water in the stock solution are separated by the difference in specific gravity due to the centrifugal force caused by the revolution, and the filter cake adheres to the inner surface of the filter tube, and the water forms a layer on the surface, and the centrifugal force rotates. As the direction in which the force is applied changes, both the filter cake and the water are peeled off from the inner surface of the filter tube, but due to the specific gravity difference between the filter cake and the water, they both draw different trajectories and are mixed again. Without descending inside the filter cylinder and descending to the filtration section,
Only the water is passed through the filtration section, and the filter mass separated from the water does not pass through the filtration section. Therefore, since a coarse filter medium can be used for the filtration unit,
It becomes easy to prevent clogging of the filter cylinder.

If the filter cylinder is rotatably attached to the rotating body at a predetermined distance from the vertical rotation axis of the rotating body,
Revolution and rotation can be given to the filter tube by a simple mechanism.

Further, it is preferable that the angular velocity given to the liquid in the filter cylinder by the rotation of the revolving means is higher than the angular velocity given to the liquid in the filter cylinder by the rotation of the rotation means.

If the magnitudes of the angular velocities are opposite, there is a possibility that the filter mass adhering to the inner surface of the filter tube remains adhering due to the centrifugal force caused by the rotation of the rotation means, but there is no such concern.

[0012]

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

Referring to FIG. 1, the liquid filtration device has a device body 11. The device body 11 has a vertical cylindrical body.
21 and a lid 22 covering the upper end opening thereof.
Near the lower end of the body 21, a filtrate discharge pipe 23 is connected. A stock solution supply pipe 24 is connected to the lid 22.

A vertical rotation shaft 31 passes through the center of the body 21. The rotating shaft 31 is penetrated by the lid 22 via the main bearing 32. The output shaft of the motor 33 is connected to the upper end of the rotating shaft 31. Inside the body 21, horizontal plate-shaped upper and lower turntables 34 and 35 are fixed to the rotating shaft 31. Although very small gaps are provided between the inner surface of the body 21 and the outer peripheral surfaces of the upper and lower turntables 34 and 35, these gaps are formed by upper and lower seal rings 36 attached to the outer peripheral surfaces of the upper and lower turntables 34 and 35, respectively. , 37.

The upper and lower turntables 34 and 35 are provided with four vertical filter tubes 41. These filter tubes 41
Are formed entirely by a punching plate, are positioned on a circumference centered on the axis of the rotating shaft 31, and are spaced apart by 90 degrees between adjacent ones. The upper end of the filter tube 41 is penetrated through the upper turntable 34 via the upper auxiliary bearing 42. Upper turntable
The upper surface of 34 and the upper end surface of filter cylinder 41 are flush. The lower end of the filter cylinder 41 is penetrated through the lower turntable 35 via the lower auxiliary bearing 43, and protrudes downward. Filter tube
At the protruding end of 41, there is provided a tapered portion 44 having a lower thickness for providing passage resistance.

A rubber friction ring 51 is fixed to the upper part of the filter cylinder 41 near the upper turntable 34. Referring to FIG. 2, the inside surface of the body 21 has a small-diameter portion inwardly bulging within a certain angle range.
52 is provided.
A gap is provided between the 51 outer peripheral surfaces. Its small diameter part 52
Is brought into contact with the outer peripheral surface of the friction ring 51.

When the rotating shaft 31 is rotated by the operation of the motor 33, the upper and lower tongue tables 34 and 35 are rotated, and the filter cylinder 41 is rotated about the center of the rotating shaft 31 as an axis. In other words, the filter cylinder 41 revolves around the rotation shaft 31.

When the filter tube 41 passes through the small-diameter portion 52 with the revolution of the filter tube 41, the friction ring 51 comes into contact with the small-diameter portion 52, and the friction ring 51 and the filter tube 41 have their own axis. Is rotated around the axis. In other words, the filter tube 41 is rotated around its own axis. Since the rotational speed due to this rotation is given to the friction ring 51 only when the friction ring 51 comes into contact with the small-diameter portion 52, and otherwise rotated only by the inertial force,
It is not constant but repetition of high speed and low speed. this is,
This is because the rotation speed due to the rotation can be kept lower than the rotation speed due to the revolution. If the friction ring 51 is brought into contact with the entire circumference of the inner surface of the body 21, the rotation speed due to rotation exceeds the rotation speed due to revolution.

With the filter cylinder 41 revolving and rotating, the stock solution is supplied into the apparatus body 11 through the stock solution supply pipe 24 and introduced into the upper end opening of the filter tube 41. The introduced undiluted solution is forcibly filtered by the centrifugal force of the revolution.
Is passed through to become a filtrate, and a filtrate discharge pipe 23
Through the device body 11.

The undiluted solution that does not pass through the filter tube 41 passes through the filter tube 41 and is discharged from the lower end opening of the filter tube 41. At this time, the filter cake contained in the undiluted solution tends to adhere to the inner surface of the filter tube 41, but as the filter tube 41 rotates, the filter cake to be attached turns to the inside of the filter tube 41. 2 (state shown in FIG. 2), the filter tube 41 is peeled off from the inner surface of the filter tube 41 under the centrifugal force of the revolution of the filter tube 41. If the centrifugal force caused by the rotation exceeds the centrifugal force caused by the revolution, the filter cake will not be peeled off from the inner surface of the filter tube 41 and will remain attached to one place, but there is no concern. By successively repeating attachment / peeling, the filter cake falls while meandering in the filter tube 41, and is finally discharged from the lower end opening of the filter tube 41.

FIG. 3 shows another embodiment. In this embodiment, another rotation means is shown in place of the rotation means. In this embodiment, portions corresponding to those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The axis of rotation 31 ends at the upper turntable 34. A bottom plate 61 is provided at the lower end of the body 21, and a round bar-shaped friction column 62 is fixed to the bottom plate 61 in an upright state. Friction pillar
Reference numeral 62 is on an extension of the rotation shaft 31 below the axis, and is penetrated by the lower turntable 35. A friction ring 63 is fixed near the lower end of the filter cylinder 41, and is brought into contact with the friction column 62. The bottom plate 61 is provided with a discharge port 64.

By appropriately changing the ratio of the rotational radii of the friction columns 62 and the friction rings 63, the rotational speed of the filter cylinder 41 due to rotation can be set to a desired speed. For example, the rotation speed of the filtration tube 41 due to the revolution is 500 to 3000 m /
If it is set to about min, the rotation speed of the filter cylinder 41 by rotation is set to about 1 to 60 m / min.

FIG. 4 shows a modification of the filter cylinder 71. In this modification, a separating section 71a is provided above the filter tube 71,
A filtering section 71b is provided below each of them. The separating portion 71a is not a punching plate but is formed by a normal pipe without a hole, and is a portion through which the stock solution does not pass. The filtering section 71b is formed by a punching plate, and is a section through which the stock solution passes.

When the filter tube 71 according to this modification is used in place of the filter tube 41 of the above embodiment, the operation is as follows.

When the undiluted solution guided into the filter cylinder 71 stays in the separation section 71a, the undiluted solution is separated by the revolving centrifugal force into a filter mass D and water W in the undiluted solution, as shown in FIG. 5 (a). Separated by the difference and separated into two layers, the filter mass D adheres to the inner surface of the filter tube 71, and the water W is coagulated on the surface. Next, as shown in FIG. 5 (b), the direction in which the centrifugal force is applied changes by slowly rotating the filter cylinder 71, and accordingly, both the filter cake D and the water W are removed from the inner surface of the filter cylinder 71. Although they are peeled off, both move on different trajectories due to the specific gravity difference between the filter cake D and the water W.
The once agglomerated filter mass D descends inside the filter cylinder 71 without being mixed with the water W again, and when it descends to the filter 71b, only the water W is passed through the filter 71b. The filter cake D passes through the filter 71b and is discharged from the lower end of the filter tube 71.

In the case of filtering muddy water, if the particles of the mud become 50 μm or less, it is considered that the filter medium is severely clogged and it is difficult to withstand practical use. By using the filter cylinder 71 according to this modified example, it was confirmed by experiments that sufficient filtration was possible even when the size of the pores of the filter medium was set to about 100 μm to about 3 mm, even when the mud was smaller than the above size. .

FIG. 6 shows a further modification of the filter cylinder 81. A filter cylinder 81 according to this modification includes an outer cylinder 82 and upper and lower inner cylinders 83 and 84 fitted therein. The outer cylinder 82 is a punched metal. The upper inner cylinder 83 is made of a pipe without a hole, and forms a separating portion 81a. Lower inner cylinder 84
Is formed of an elastic round bar spirally wound so as to be in contact with the vertically adjacent ones, and forms a filtering portion 81b. The diameter of the round bar is, for example, 5 mm.

When the filter tube 81 according to this modification is used, the water to be filtered flows out of the filter section 81b through the gap between the round bars.
The round bars rub against each other due to the centrifugal force, vibration, and the like associated with the revolution and rotation of the cylinder, and the clogging is eliminated.

FIG. 7 shows a further modification of the filter cylinder 91. A filter cylinder 91 according to this modified example includes an outer cylinder 92 and upper and lower inner cylinders 93 and 94, as shown in FIG. The outer cylinder 92 is made of punched metal. The upper inner cylinder 93 is made of a pipe without a hole, and forms a separating portion 91a. Lower inner cylinder 94
Is composed of a large number of ceramic rods arranged on the circumference so as to be in contact with adjacent ones, and forms a filtering portion 91b. The diameter of the ceramic rod is, for example, 5 mm. The upper and lower ends of the ceramic rod are loosely fitted into an annular groove (not shown), and are rotatable and swingable. Also according to this modification, clogging can be prevented by rubbing between the ceramic rods.

FIG. 8 shows a distribution pipe 101 as an example of a means for introducing a stock solution into a filter cylinder. Distribution pipe
101 is a vertical main pipe rotatably penetrating the lid 22
111, each of which is branched from the lower end of
It comprises four L-shaped branches 112 connected to the upper end of one. A supply pipe 113 is inserted and connected to the main pipe 111 so that the main pipe 111 can rotate freely.

When such a distribution pipe 101 is used, the distribution pipe
Since the 101 is rotated together with the turntable 34, the stock solution is guided from the supply pipe 113 to each of the filter tubes 41, and the stock solution can be evenly distributed to the four filter tubes 41.

The material of the filter tube is appropriately selected according to the type of liquid to be filtered, in addition to the above examples. Instead of the punching plate, a wire mesh, cloth, or the like, or a combination thereof with other materials can be used. If consideration is given to abrasion, the filter tube may be formed of porous ceramic, or a ceramic tile may be lined on the inner surface of the metal pipe.

Further, separate motors may be used as means for revolving and rotating the filter cylinder. Then, it is easy to set the speed of the revolution and the rotation.

[0035]

According to the present invention, there is provided a liquid filtering apparatus in which the filter cylinder is hardly clogged.

[Brief description of the drawings]

FIG. 1 is a perspective view including a crushed cross section of a liquid filtration device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view corresponding to FIG. 1, showing another embodiment.

FIG. 4 is a perspective view showing a modification of the filter tube.

FIG. 5 is an explanatory diagram showing a separating action between a filter cake of a stock solution and water.

FIG. 6 is a perspective view showing a further modification of the filter tube.

FIG. 7 is a perspective view showing a further modification of the filter tube.

FIG. 8 is a vertical longitudinal sectional view showing a means for introducing a stock solution into a filter tube.

[Explanation of symbols]

 23 Discharge pipe 24 Supply pipe 34 Upper turntable 35 Lower turntable 41 Filter tube 71a Separator 71b Filter

Claims (4)

[Claims] 1. A filter cylinder 41 having a vertical axis, revolving means for rotating the filter cylinder 41 about a vertical line separated by a predetermined distance from its own axis, and a filter cylinder 41 having its own axis as an axis. A rotating means for rotating, an introducing means 24 for introducing a stock solution to be filtered into the upper end opening of the filter tube 41, and preventing mixing of the filtrate passed through the filter tube 41 and the unfiltered solution discharged from the lower end opening of the filter tube 41 A liquid filtering device comprising: 2. The liquid filtering apparatus according to claim 1, wherein a separation unit 71a that does not allow the undiluted solution and a filtration unit 71b that allows the undiluted solution are provided above and below the filtration tube 41. 3. The liquid filtering apparatus according to claim 1, wherein the filter cylinder is rotatably mounted on the rotating body at a predetermined distance from the vertical rotation axis of the rotating bodies. 4. The rotation of the revolving means causes the angular velocity given to the liquid in the filter cylinder 41 to change by the rotation of the rotation means.
The angular velocity given to the liquid in 41 is larger than the angular velocity.
The liquid filtration device according to any one of the above.