JPH1099611A - Continuous filtration device for suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to actively regenerate filter holes arranged at an interval between laminated suspended microparticles by varying the outer diameter of an adjacent filter element to a filter element in order to vary the rotating peripheral speed, in a filtration device which separates a suspension into a filtrate and suspended microparticles by rotating disc-like filter elements arranged adjacently to each other. SOLUTION: Filter pieces of disc shape and liners are fitted into rotary shafts 23, and a specified number of adjacent filter elements 2 comprising large filter elements 30 and small filter elements 31 which are alternately arranged with filter pieces of different diameter are provided as a group A of filter elements located near a liquid supply orifice 11 of the entire train of the filter elements 20. Further, the suspension is supplied from the liquid supply orifice 11 and at the same time, the rotary shafts 23 of the upper train 20 of the filter elements 2 are rotated counter-clockwise, while the rotary shafts 23 of the lower train 20 of the filter elements 2 are rotated clockwise. Consequently, in the filter elements of the group A of the filter elements, the suspension is filtered through a clearance between the filter pieces and a filtrate flows into the filtrate guide path of the liner to be drained to the outside of a filtration tank 1 from a filtrate drain orifice 13 through a filtrate chamber. On the other hand, suspended microparticles are laminated on the filter pieces and the outer periphery of the liner to be conveyed to a discharge port by the rotation of the filter pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device for separating a suspension containing suspended fine particles into a filtrate and suspended fine particles accurately by a plurality of filter bodies arranged adjacent to each other.

[0002]

2. Description of the Related Art An apparatus for filtering a suspension by sequentially arranging a plurality of filter elements formed by stacking disk-shaped filter pieces into a filter element row and rotating each filter element in the same direction. Discloses various things. In these apparatuses, the filtrate is guided toward the center of the filter through the filter pieces and discharged out of the apparatus. On the other hand, the suspended fine particles remaining after filtration are layered on the outer periphery of the filter and layered. The gap between each of the suspended fine particles serves as a filtration hole, and the suspended fine particles are hooked at the filtration hole to accurately separate the filtrate from the filtrate. Then, the suspended fine particles that are in contact with the outer periphery of the filter body and the filter in the valley formed between the outer circumferences of the two filter bodies are in the process of being transferred to the adjacent filter body by the rotation of the filter body. The layered state with the suspended particulates away from the outer periphery of the body is sheared. The suspended suspended fine particles change their moving directions on the outer periphery of the filter on the sending side and the filter on the receiving side. In other words, the direction of entering the valley between the filter bodies changes to the direction of exiting from the valley. Then, the contact point of each fine particle of the laminated suspended fine particles moves, and the filtration hole is newly regenerated, thereby enabling a continuous filtration operation. However, in the conventional apparatus, when separating suspended particles in a suspension that are extremely fine and have a very strong coupling force between suspended particles, etc., only the valleys formed between the outer peripheries of adjacent filter bodies are required. In some cases, the layered state of the suspended fine particles was not sheared. Therefore, it was attempted to increase the diameter of the filter body in order to increase the valley on the outer periphery of the filter body and increase the filtering ability, but the thickness of most of the filter pieces constituting the filter body was 0.2 mm to
Since it is extremely thin, about 1 mm, distortion occurs during the processing, so that the diameter cannot be made too large. Therefore, the conventional principle may not be able to fully exhibit the original principle.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to positively move the contact between the fine particles of the laminated suspended fine particles on the outer periphery of the rotating filter body and the fine particles, thereby promoting the regeneration of the filtration hole which is the gap.

[0004]

In order to change the rotational peripheral speed of adjacent filter elements in a filter element row, the outer diameter of adjacent filter elements is made different.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the apparatus according to the present invention, which will be described in detail with reference to FIG. The filtration device according to the present invention includes a filtration tank 1 and a filter body 2.

[0006] The filtration tank 1 has a liquid supply port 11 on the upper surface for supplying a suspension from the outside, and laminated suspended fine particles (hereinafter referred to as a laminated suspension) filtered upward in the forward direction (the right wall surface in FIG. 1). A discharge port 12 for discharging turbid fine particles to the outside, and a filtrate chamber 10 having a filtrate discharge port 13 are provided in the side direction. The filter body 2 has a disk-shaped filter piece 21 and a liner 22 having a smaller diameter than the filter piece 21 properly combined and fixed to a rotating shaft 23 fitted at the center. The filter body 2 is
A large number of pieces are continuously arranged, and the filter pieces 21 are arranged in a state where the filter pieces 21 abut against the liner 22 of the adjacent filter element 2 to form a filter element row 20. Liquid mouth 11
And the discharge port 12 are arranged vertically. Further, each of the rows of filter bodies 20, 20 is provided with a predetermined number of filter bodies 2, 2 near the liquid supply port 11.
.. (4 in FIG. 1 upper filter row 20; lower filter row 2
At 0, 6 pieces are arranged. ) Is referred to as filtration filter group A, and discharge port 1
A predetermined number of filter media 2, 2,... (In FIG. 1, each of the four upper and lower filter arrays 20 is arranged by four) as a press filter media group B,
In each filter body 20 of the filter body A, the filter pieces 21 and the liner 22 are provided with an appropriate number (eight in the figure) of a filtrate guide path 24 in parallel with the rotation shaft 23, and the filter body 20 is formed. The end of the filtrate guide path 24 faces the filtrate chamber 10. Moreover, large filter bodies 30 and small filter bodies 31 in which the diameters of the filter pieces 21 of the filter bodies 2 adjacent to the filter body A are different from each other are alternately arranged.

As another embodiment, as shown in FIG. 5, a liquid supply port 11a is provided on an upper surface, a discharge port 12a is provided on an upper part in a forward direction (left wall in the figure), and a filtrate discharge port 13a is provided on a side surface. In a filtration tank 1a comprising a filtrate chamber 10a, a filter body row 20a comprising a filter body 2a having the same structure as described above is provided with a liquid supply port 11a and a discharge port 1a.
2a, two filter body rows 20a are arranged in a meandering manner,
The filter body group Aa is divided into a filter body group Ba and a filter body group Ba. The filter body 2a having a different diameter from the filter body group Aa is arranged in the upper body row 20a. The filter element 2a adjacent to the filter element 2a is a large filter element 30a, the other filter elements 2a are small filter elements 31a, and the lower filter element row 20a is only the last filter element 2a as a small filter element 31a. I have. In addition, the symbol G in the figure is a gear connected to a rotation drive motor (not shown), and is a rotation shaft 23 (2) of the entire filter body 2 (2a).
3a) is attached to one end. Also, reference numeral 5 (5
a) is a filter body 2 (2a) immediately adjacent to the discharge port 12 (12a).
This is a scraping plate for scraping the suspended fine particles from the sheet.

[0008]

Next, the operation of the present invention will be described. First, the suspension is supplied from the liquid supply port 11 to a water level that does not leak from the discharge port 12, and at the same time, the rotating shaft 23 of all the filter bodies 2 is moved in a predetermined direction (the upper filter body row 20 in FIG. Direction, the lower filter body row 20 is rotated clockwise). At this time, in the filter medium 2 of the filter medium group A, the suspension is composed of the filter pieces 21 and 2 of the filter body 2.
The filtrate is filtered through the gap with the filter fluid 1 and flows into the filtrate guide passage 24 in the liner 22, passes through the filtrate guide passage 24 and the filtrate chamber 10, and is discharged from the filtrate outlet 13 to the outside of the filtration tank 1.
On the other hand, the suspended fine particles are stacked on the outer periphery of the filter piece 21 and the liner 22, and are transported in the direction of the discharge port 12 by the rotation of the filter piece 21. The layered suspended particulates fill the space between the upper filter row 20 and the lower filter row 20, and are interrupted by the laminated suspended particulates, so that the suspension from the liquid supply port 11 directly flows out of the discharge port 12. After that, the inside of the filtration tank 1 is filled with the suspension.

Here, the rotation of the filter piece 21 causes the discharge port 12 to rotate.
As the movement of the layered suspended fine particles transferred in the direction, the one near the outer periphery of the filter body 2 changes its direction into the valley with the adjacent filter body 2 in conjunction with the movement of the filter body 2. On the other hand, the particles at a position distant from the outer periphery of the filter body 2 (the layered suspended fine particles at the center of the filter body row 20 and the filter body row 20) have a straight line between the two filter body rows 20 and 20. Will be moved to. At the outer periphery of the filter body 2 on the sending side and the filter body 2 on the receiving side, the layered suspended fine particles change their moving directions. That is, the direction is changed to the direction in which the filter element 2 on the sending side tries to enter the valley and the filter element 2 on the receiving side tries to exit from the valley. When the small filter 30 moves from the small filter 30 to the large filter 3, or when the filter moves from the large filter 3 to the small filter 30, the density of the layered suspended fine particles varies from dense to coarse due to the difference in the peripheral speed of the filter 2. , From coarse to dense. Also, the movement of the suspended particles at that time is
A difference occurs in the moving distance between the stacked suspended fine particles that change the moving direction and the stacked suspended fine particles that move linearly, and a shearing phenomenon occurs. In this case, the stacked suspended fine particles moving along the filter body 2 are stirred. The contact between the fine particles is moved by the change in the peripheral speed of the filter body 2, and the action is more positively performed, and the contact between the fine particles is moved in the front-back direction of the stacked suspended fine particles. . By this action, the filtration holes between the fine particles are constantly regenerated, so that continuous filtration becomes possible. In the pressed filter group B, the interval between the upper and lower filter bodies 2 is narrower than that of the filtered filter group A, so that the laminated suspended fine particles filtered by the filtered filter group A are squeezed out from both upper and lower sides. It is pushed out of the filtration tank 1 from the outlet 12.
Here, the object of the present invention is achieved.

[0012]

As described above, the apparatus of the present invention differs from the conventional one in this type of filter by rotating the filter pieces by changing the diameter of a specific filter in the filter row arranged in the filter tank. This has the effect of actively regenerating the filtration holes in the gaps between the laminated suspended fine particles, which is the filtering action, and further promotes the continuous filtering action.

[Brief description of the drawings]

FIG. 1 is a front sectional view of the device of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged view of a filter body in the present invention.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

FIG. 5 is a front sectional view of another embodiment of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration tank 11 Suspension liquid supply port 12 Suspended fine particle discharge port 13 Filtrate discharge port 2 Filter body 21 Filter piece 22 Liner 23 Rotation axis 24 Filtrate guideway 30 Large filter body 31 Small filter body A Filtration body group B Pressing Filter body group

Claims (2)

[Claims] 1. A disk having a rotary shaft as a center between a liquid supply port of a suspension, a liquid supply port in a filtration tank having a discharge port of suspended fine particles and a discharge port of a filtrate, and a discharge port. A large number of filter bodies formed by stacking a plurality of filter pieces and liners are arranged side by side in an adjacent state to form a filter body row, and the filter body row is divided into a filter body group and a press body group. In the filter device of the filter media group, the filter pieces and the liner are provided with a filtrate guide path communicating with the filtrate outlet in the axial direction, and the filter media of the filter media group have different diameters. Continuous filtration device for suspensions. 2. The continuous filtration apparatus for a suspension according to claim 1, wherein the diameters of the filter bodies of the filter body group in the filter body according to the first aspect are alternately large and small.