JPH10165841A - Centrifuge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate sludge feed water into water and semidehydrated solid matter without using a filter to eliminate the danger of the filter being clogged. SOLUTION: The centrifuge is provided with separating cylinders 13 each having a vertical axis line, a revolution means for revolving the separating cylinders 13 around a vertical line at prescribed distance from their own axis lines, a rotation means for rotating the separating cylinders 13 around their own axis lines, and an introducing means for introducing feed water to be separated into the separating cylinders 13. An inward projecting annular bank part 72 is installed at the upper end of the inner surface of each separating cylinder 13, and also a drain port part 73 is installed inside the bank part 72. The radius of rotation from the axis line of the separating cylinder 13 to the head of the bank part 72 is made larger than that to the opening edge part of the lower end of the inner surface of the separating cylinder 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a centrifugal separator,
For example, centrifugal separation to separate sludge raw water such as sludge deposited in rivers and lakes, iron powder and coal discharged from steel mills, and muddy water from civil engineering work into water and semi-dehydrated solids The present invention relates to a separation device.

[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,
Both types use filters, which are easily clogged.
It had to be replaced and was cumbersome.

[0004] It is an object of the present invention to provide a centrifugal separator capable of separating raw sludge water into semi-dewatered solids without using a filter, and having no fear of clogging of the filter. .

[0005]

SUMMARY OF THE INVENTION A centrifugal separator according to the present invention includes a separation cylinder having a vertical axis, revolving means for rotating the separation cylinder about a vertical line separated by a predetermined distance from its own axis, It has a rotation means for rotating the cylinder about its own axis and an introduction means for introducing the raw water to be separated into the separation cylinder, and an inwardly projecting annular ridge is provided at the upper end of the inner surface of the separation cylinder. The drain port is provided inside the bank, and the radius of rotation from the axis of the separation cylinder to the tip of the bank is smaller than the radius of rotation from the axis of the separation cylinder to the edge of the opening at the lower end of the inner surface of the separation cylinder.

In the centrifugal separator according to the present invention, when raw water is introduced into the separation tube, the introduced raw water is separated by a revolving centrifugal force into water and solids in the raw water due to a difference in specific gravity, and the semi-dewatered solid When the substance adheres to the inner surface of the separation cylinder and the water forms a layer on the surface, the water volume of the water increases and the water exceeds the tip of the weir. When the separation cylinder changes its direction of rotation by rotation during this time, the semi-dehydrated solids change their direction against centrifugal force while adhering to the inner surface of the separation cylinder. When the centrifugal force exceeds the adhesive force of the semi-dehydrated solid, the semi-dehydrated solid separates from the inner surface of the separation cylinder, descends in the separation cylinder, and is discharged from the lower end opening. Therefore, the sludge raw water can be separated into moisture and semi-dehydrated solids without using a filter.

[0007] Another centrifugal separator according to the present invention comprises a rotating body rotatably supported on the apparatus body about a vertical line, and a centrifugal separator at a plurality of locations on a circumference at a predetermined distance from the rotation center of the rotating body. A plurality of separation cylinders having a vertical rotation center rotatably mounted thereon, and an introduction means for introducing raw water to be separated into the respective separation cylinders; And a drain port is provided inside the bank, and the radius of rotation from the axis of each separation cylinder to the tip of the bank is smaller than the radius of rotation from the axis of each separation cylinder to the lower edge of the inner surface at the lower end of the separation cylinder. Things.

In another centrifugal separator according to the present invention, the separation operation can be efficiently performed by the plurality of separation cylinders.

When the rotating body is rotated, the separation cylinder can revolve. When the separation cylinder is rotated about its axis, the separation cylinder can rotate. Therefore, the separation cylinder can be rotated while revolving. Can be performed reliably and easily.

[0010]

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

Referring to FIG. 1, a centrifugal separator includes a hollow device body 11 and a rotating body 12 housed in the body 11.
And four vertical cylindrical separation cylinders 13 attached to the rotating body 12.

The body 11 comprises a vertical cylindrical body wall 21 and a flat top wall 22 covering the upper end opening.

Near the lower end of the inner surface of the body wall 21, a water collecting gutter 23 is provided.
And a water discharge pipe 24 is provided so as to communicate with the gutter 23. At the lower end of the torso wall 21, a horizontal strip-like support bar 25 is fixed so as to pass through the torso wall axis and cross the lower end opening of the torso wall. A bearing 26 is fixed to the center of the upper surface of the support bar 25 so as to be concentric with the trunk wall axis. Near the upper end of the outer surface of the body wall 21, a main motor 27 is mounted vertically upward. Main drive sprocket on output shaft of main motor 27
28 is fixed.

A shaft insertion hole 31 is formed in the center of the top wall 22 so as to be concentric with the trunk wall axis. A main bearing 32 is fitted into the shaft insertion hole 31.

The rotating body 12 includes a hollow rotating shaft 33 passed through a main bearing 32, a flat top wall 42 fixedly connected to a lower end of the rotating shaft 33 via a distribution chamber 34, and a top wall 42.
A vertical cylindrical torso wall 41 suspended from the periphery of the
41 includes a flat bottom wall 44 covering the lower end opening, and a top cylindrical wall 43 and a vertical cylindrical partition wall 43 provided at the center of the bottom wall 44 so as to be concentric with the body wall 41.

A main driven sprocket 48 is fixed to the upper protruding portion of the rotary shaft 47, and a sub bearing 49 is fitted over the main driven sprocket 48. A toothed belt 51 is wound around the main driven sprocket 48 and the main drive sprocket 28. The lower part of the raw water supply pipe 52 is inserted into the rotating shaft 47. A housing 53 holding a sub-bearing 49 is provided integrally with an upper protruding portion of the stock solution supply pipe 52.

Near the outer periphery of the top wall 42, four upper separation cylinder insertion holes 61 are formed so as to divide the circumference around the axis of the rotating shaft 47 into four equal parts.

At the lower end of the body wall 41, a skirt 45 is provided in the gutter 23 in a hanging manner, and a communication hole 46 is formed slightly above the bottom wall 44.

Near the outer periphery of the bottom wall 44, four lower separation cylinder insertion holes 62 are formed so as to be concentric with the four upper separation cylinder insertion holes 61, respectively. A sub motor 54 is mounted vertically downward at the center of the upper surface of the bottom wall 44 located in the partition wall 43. The auxiliary motor 54 has an output shaft 55 which is concentric with the rotation shaft 47 and penetrates the bottom wall 44 and is supported by the bearing 26. Output shaft
A sub-drive sprocket 56 is fixed to 55.

The separation tube 13 has an upwardly projecting vertical introduction pipe 35 formed integrally. The upper end of the introduction pipe 35 is inserted and held in the upper separation cylinder insertion hole 61 via the upper bearing 63. Introductory tube 35
The branch pipe 36 extending from the distribution chamber 34
Is inserted.

A portion near the lower end of the separation cylinder 13 is inserted and held in a lower separation cylinder insertion hole 62 via a lower bearing 64. Separation tube
A sub-driven sprocket 65 is fixed to the lower protrusion of the thirteen.

As shown in FIG. 2, the auxiliary driving sprocket 56
One endless chain 57 is wound around the four sub driven sprockets 65.

FIG. 3 shows a detailed structure of the separation cylinder 13. The separation cylinder 13 has an inner surface 71 having a constant diameter from top to bottom. An inwardly projecting annular upper bank at the upper end of the inner surface 71 of the separation cylinder
72, and a drainage port 73 inside the upper embankment 72
Is provided. On the other hand, an inwardly projecting annular lower bank 74 is provided at the lower end of the inner surface 71 of the separation cylinder, and a solid discharge port 75 is provided inside the lower bank 74. Referring to FIG. 4, the drain port 73 is formed by forming a plurality of circular small holes 76 arranged on the circumference so as to circumscribe the boundary S with the upper bank 72. . A lower extension 77 of the introduction tube 35 is provided in a portion inside the row of the small holes 76. On the other hand, the solid material discharge port 75 is formed by opening the whole thereof.

The axis of the separation cylinder 13 is denoted by C, and the upper bank 72
Assuming that the radius of gyration from the tip to the tip is R1 and the radius of gyration from the axis C to the tip of the lower bank 74 is R2, R1> R2.
That is, the height of the lower bank 74 is higher than the height of the upper bank 72.

When the main motor 27 is operated, the rotating body 12 rotates around its rotating shaft 47, and with the rotation of the rotating body 12, the separation cylinder 13 revolves around the rotating axis of the rotating body 12. On the other hand, when the sub motor 54 is operated, the chain 57 is rotationally moved, whereby the four separation cylinders 13 are simultaneously rotated around their own axes.

The revolution speed and rotation speed of the separation cylinder 13 are appropriately set according to the properties of the raw water to be separated. For example, the revolution speed of the separation cylinder 13 is 500 to 1000 m /
Set to be min. Rotation radius of separation cylinder 13 is 4
If it is about 00 mm, the revolution speed of the separation cylinder 13 is approximately 600 rpm, and the revolution speed of the separation cylinder 13 is 1 to
It is set to about 2 rpm.

When raw water is supplied to the supply pipe 52 in a state where the separation tube 13 is revolved and rotated, the distribution chamber is rotated.
34, raw water is supplied to each separation cylinder 13 through distribution pipe 36 and introduction pipe 35.
Is evenly distributed. At this time, the extension of the introduction pipe 35
Without the 77, the raw water introduced into the separation tube 13 would not be separated, and the small holes 76 could immediately flow out.However, the raw water was guided by the extension portion 77 to the depth inside the separation tube 13. be introduced.

As shown in FIG. 4 (a), the raw water introduced into the separation cylinder 13 is forcibly separated into water W and solid matter D by centrifugal force due to revolution. The solid matter D adheres to the inner surface of the separation tube 13, and the water W forms a layer on the surface of the solid matter D. The layered moisture W is subjected to a centrifugal force that causes the inner surface of the separation tube 13 to spread in the circumferential direction and the vertical direction. When the depth of the layer of water W reaches the height of the upper embankment 72,
The water W passes over the upper bank 72 and is discharged to the outside of the separation cylinder 13 through the small hole 76 of the drain port 73. At this time, since the height of the lower levee 74 is higher than the height of the upper levee 72, there is no concern that the water W will cross the lower levee 74. Exhausted water W
Is drawn out of the rotating body 12 through the communication hole 46, received by the gutter 23, and discharged out of the apparatus body 11 through the discharge pipe 24.

As shown in FIG. 4 (b), with the rotation of the separation tube 13, the solid matter D attached to the inner surface of the separation tube 13 gradually turns inside the inner surface of the separation tube 13 against the centrifugal force of the revolution. When the centrifugal force of the revolution of the separation tube 13 exceeds the adhesion of the solid D, the solid D is peeled off from the inner surface of the separation tube 13 by the centrifugal force. The peeled solid D is placed in a separation tube
It descends inside 13 and is discharged from the solid discharge port 75.

Only the solid matter D is moved by the rotation, and the water W has good fluidity. Therefore, the water W always stays outside the inner surface of the separation cylinder 13 due to the centrifugal force of the revolution. And
It is discharged when it accumulates in the small hole 76 to the position. Therefore, efficient dewatering can be performed continuously.

FIG. 5 shows a modification of the separation cylinder.
Four blades 81 are provided on the inner surface of the separation cylinder 13 according to this modification. The four blades 81 extend in a vertical direction at a position that equally divides the inner surface of the separation tube 13 into four parts, and stand up toward the axis of the separation tube 13. The blade 81 has a plurality of drain holes 82 arranged in a line.

This separation tube 13 is suitable for separating raw water containing a less sticky and free flowing solid material. Solid matter of such properties does not adhere to the inner surface of the separation tube 13 and does not move inside the inner surface of the separation tube 13 according to the rotation of the separation tube 13, and may remain outside the inner surface of the separation tube 13 with moisture. However, the solids can be forcibly moved by the blades 81. In this case, only the moisture can pass through the drainage hole 82 of the blade 81 and stay outside the inner surface of the separation tube 13.

FIG. 6 shows another embodiment.
In the centrifugal separator according to this embodiment, a separation cylinder 91 connected in three stages up and down at one location in the circumferential direction of the rotating body is used. Except for this point, it is the same as that of the embodiment of FIG. Corresponding parts are denoted by the same reference numerals in both embodiments.

According to this centrifugal separator, three separation cylinders
By performing the separation operation in order at 91, the separation efficiency can be increased.

As shown in detail in FIG. 7, the separation cylinder 91 includes an upper large diameter portion 101, a lower tapered portion 102, and a lower small diameter portion 103.
have. At the upper end of the inner surface 111 of the separation cylinder, a bank 112 and a drainage port 113 are provided. The bank 112 and the drain 113 are the same as those in the embodiment of FIG. A small hole 114 is formed in the drain port 113. On the other hand, there is no bank at the lower end of the inner surface 111 of the separation cylinder,
The entire lower end opening of the inner surface 111 of the separation cylinder is
It has been done.

The axis of the separation cylinder 91 is denoted by C, and the embankment 112
Let r1 be the radius of rotation to the tip and r2 be the radius of rotation from the axis C to the opening edge of the lower end of the inner surface of the separation cylinder 91.
> R2.

The water W and the solid matter D separated in the separation cylinder 91 according to this embodiment are, as in the case of the above-described embodiment, only the water W is discharged from the small holes 114, and the solid matter D is a solid matter. It is discharged from the material discharge port 115.

FIG. 8 shows a modification of the separation tube 91 of the centrifugal separator according to the embodiment of FIG. A bank 121 and a drain 122 are formed at the upper end of the separation cylinder 91 according to this modification. The entire inside of the bank 121 is opened, and the small-diameter portion 103 of the upper separation cylinder 91 is inserted into the opening. The large diameter part 101 of the lower separation cylinder 91 and the small diameter part 10 of the upper separation cylinder 91
3 form a double wall structure. A gap is formed between the distal end of the bank 121 and the small diameter portion 103, and this forms a drain port 122. The upper and lower separation cylinders 91 are connected by connecting portions 131 crossing the gap at a plurality of locations.

[0039]

According to the present invention, raw sludge water can be separated into water and semi-dehydrated solids without using a filter.

[Brief description of the drawings]

FIG. 1 is a perspective view including a crushed cross section of a centrifugal separator according to the present invention.

FIG. 2 is a partially cutaway horizontal cross-sectional view of the device.

FIG. 3 is a vertical longitudinal sectional view of a separation cylinder of the same device.

FIG. 4 is an explanatory diagram of a separating operation by the device.

FIG. 5 is a perspective view including a crushed cross section showing a modification of the separation cylinder of the apparatus.

FIG. 6 is a perspective view of a centrifugal separator according to another embodiment of the present invention, including a crushed cross section corresponding to FIG. 1;

FIG. 7 is a vertical longitudinal sectional view of a separation tube of a centrifugal separator according to another embodiment.

FIG. 8 is a perspective view including a crushed cross section showing a modification of the separation tube of the centrifugal separator according to the other embodiment.

[Explanation of symbols]

 11 Body 12 Rotating body 13 Separation cylinder 72 Embankment 73 Discharge port R1 Turning radius R2 Turning radius

Claims (2)

[Claims] 1. A separating cylinder having a vertical axis, revolving means for rotating the separating cylinder about a vertical line separated by a predetermined distance from its own axis, and rotating the separating cylinder about its own axis. Means, and an introduction means for introducing raw water to be separated into the separation cylinder, and an inwardly projecting annular ridge is provided at the upper end of the inner surface of the separation cylinder, and a drain port is provided inside the ridge. A centrifugal separator, wherein the radius of rotation from the axis of the separation cylinder to the tip of the bank is smaller than the radius of rotation from the lower end of the inner surface of the separation cylinder to the opening edge. 2. A rotating body rotatably supported by a device body about a vertical line, and a vertical body rotatably mounted at a plurality of positions on a circumference at a predetermined distance from a rotation center of the rotating body. A plurality of separation cylinders having a center of rotation, and an introduction means for introducing raw water to be separated into each separation cylinder. A centrifugal separator, wherein a drain port is provided inside the section, and a radius of rotation from the axis of each separation cylinder to the tip of the bank is smaller than the radius of rotation from the inner edge to the lower edge of the inner surface of each separation cylinder.