JP2000005638A - Centrifugal separator for liquid-containing substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate centrifugally efficiently liquid-containing substance by a method wherein the liquid-containing substance is supplied into a rotating inner cylinder by secting a tubular space between the inner cylinder and a rotating outer cylinder, a flow of the liquid-containing substance is changed to a radial direction by a direction-changing member of a pressure- receiving member, and a centrifugal force is given to the liquid-containing substance by a rotary force of the inner cylinder. SOLUTION: Liquid-containing substance is supplied from a supply pipe 14 into an inner cylinder 1, stored in a space between a pressure receiving member 7 and a supporting part 6, a flow is changed to an outside of a radial direction by a direction-changing member 7B of the pressure-receiving member 7, and a centrifugal force is given by a rotary force of the inner cylinder 1. Then, the liquid-containing substance is allowed to flow out from an opening 8 to an outside of the inner cylinder 1, flow in a tubular spacing between the inner cylinder 1 and an outer cylinder 2, the centrifugal force to be given is redoubled by respective rotary forces of the inner cylinder 1 and the outer cylinder 2, and a separated liquid and concentrated substance in the liquid-containing substance are separated to inner and outer both sides of the radial direction. Successively the concentrated substance is conveyed in an auger cylinder part 2B direction of the outer cylinder 2 with a screw conveyor 9 rotating in the tubular space to be exhausted from an exhaust opening 10, and the separated liquid is exhausted from an opposite side exhaust opening 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a centrifugal separator for a liquid-containing substance.

[0002]

2. Description of the Related Art An apparatus of this kind is disclosed in Japanese Patent Laid-Open No. 6-63.
The type disclosed at 450 is known.

This known device is called a screw decanter type centrifugal separator, and comprises an outer cylinder called a bowl which rotates in one direction, and an inner cylinder which is coaxial with this and rotates in the same direction with a rotation difference. , A screw conveyor attached to the inner cylinder. The outer cylinder generates centrifugal force by rotation to separate the liquid-containing substance supplied to the annular space between the outer cylinder and the inner cylinder, and a component containing a large amount of a substance having a large specific gravity (hereinafter, referred to as “
It is separated into a liquid component (hereinafter referred to as a “separated liquid”) and a liquid component (hereinafter referred to as a “separated liquid”). The outer cylinder rotates at a constant but various speed so as to be able to respond to the components and characteristics of the liquid-containing substance. Due to the centrifugal force generated by this rotation, a concentrated substance having a higher specific gravity than the separated liquid is collected on the inner wall side of the outer cylinder. Conversely, the light substance, ie, the separated liquid, in the liquid-containing substance moves radially inward with respect to the concentrated substance by centrifugal force.

Further, the screw conveyor attached to the outer surface of the inner cylinder rotates together with the inner cylinder in the same direction with a slight relative speed with respect to the outer cylinder. This differential rotation creates a relative motion between the series of screws and the wall of the barrel, and as a result,
The concentrated substance is slowly transported along the inner wall of the outer cylinder in the axial direction of the cylinder. Then, the separated heavy separated substance and light separated liquid are usually separately discharged from respective discharge ports having a level difference formed at both ends of the outer cylinder.

[0005]

In order to improve the separation performance of the centrifugal separator, it is necessary to rotate the outer cylinder at a high speed and increase the centrifugal force. However, there is a disadvantage that the power consumption increases as the rotation speed increases, as compared with other separation methods, and it is desired to reduce the power consumption.

Power consumption includes air resistance and bearing resistance loss for maintaining rotation, separation liquid loss, and condensed substance loss. The air resistance and the bearing resistance loss are due to the air resistance and the resistance at the bearing that the outer cylinder receives when the outer cylinder rotates at a high speed. The energy loss and the energy lost when the separated liquid and the concentrated substance are moved to one shaft end, and the velocity energy that is retained even after being separated from the liquid-containing substance. Of these various losses,
A relatively large proportion is the separation liquid loss.

The liquid-containing substance is discharged through a feed pipe on the rotation axis of the outer cylinder and the inner cylinder into an inner cylinder driving a screw conveyor, and collides with a circular bottom plate provided in the inner cylinder. Then, while receiving a rotational force in the circumferential direction by the frictional force from the rotating inner cylinder, it receives centrifugal force and moves into the outer cylinder through several holes in the inner cylinder. Thereafter, the concentrated substance is slowly carried along the inner wall of the outer cylinder in the axial direction of the cylinder. And
The heavy condensed material separated from the liquid-containing material and the lightly separated liquid are usually separately discharged from respective outlets at both ends of the outer cylinder and having a radial level difference.

As described above, in order to apply a centrifugal force to the liquid-containing substance discharged in the axial direction from the feed pipe into the inner cylinder, the flow of the liquid-containing substance is changed from the axial direction to the radial direction. Energy must be imparted to the material. However, in the above-described conventional apparatus, no special measures have been taken for applying the energy, and it cannot be said that the energy was applied smoothly and effectively.
Also, if the liquid-containing substance does not reach the inner cylinder and synchronizes with the inner cylinder due to a small frictional force on the inner wall of the inner cylinder, the flow of the liquid-containing substance dropped from the inner cylinder may be disturbed, and the sedimentation separation performance Is impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a centrifugal separator which solves the problem of the conventional apparatus, applies a centrifugal force to a liquid-containing substance smoothly and effectively, and has high energy efficiency.

[0010]

According to the present invention, there is provided a centrifugal separator for a liquid-containing substance according to the present invention, wherein an inner cylinder which rotates about a substantially horizontal axis and an outer cylinder which forms an annular space between the inner cylinder and the inner cylinder. And a cylinder. The inner cylinder has an opening at one end in the axial direction and a closed portion at the other end. The inner cylinder has an opening at an intermediate portion in the axial direction, so that the inner space of the inner cylinder communicates with the annular space. The outer cylinder has a first outlet on a peripheral wall on one end and a second outlet on a side end wall on the other end. Further, a conveyor for transporting the liquid-containing substance in the annular space toward one end is provided in the inner cylinder or the outer cylinder. A liquid-containing substance supply pipe that penetrates one end of the outer cylinder is arranged to enter the inner space of the inner cylinder from the opening of the inner cylinder along the axis.

In the centrifugal separator, in the present invention, the inner cylinder has a pressure receiving member facing the discharge port of the liquid-containing substance supply pipe and receiving the discharged liquid-containing substance, and the pressure receiving member is formed of the above-mentioned discharged liquid-containing substance. A diverting member for deflecting the flow in the radial direction is provided, and the opening is located between the diverting member and the support portion of the discharge port of the liquid-containing substance supply pipe in the axial direction. .

[0012] In a preferred embodiment, the diverting member is a spiral-shaped blade centered on the axis.

[0013] The outer cylinder may have a conical portion whose radius gradually decreases toward one end. Further, the conveyor can be a screw conveyor.

In the present invention, the liquid-containing substance discharged from the liquid-containing substance supply pipe into the inner cylinder reaches the pressure receiving member of the inner cylinder, and is rotated by the rotating deflection member provided on the pressure receiving member. The hydrated material obtains a centrifugal force while diverting the flow radially. Therefore, the liquid-containing substance can obtain the centrifugal force without much loss.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes an inner cylinder disposed substantially horizontally, and an outer cylinder 2 is rotatably supported by a bearing 3 concentrically with respect to the inner cylinder 1.

The inner cylinder 1 is open at one end (the left end in FIG. 1) and closed at the other end, and the shaft 4 is closed at the other end.
And is connected to the drive unit 5 via a rotary drive. Inside the inner cylinder 1, a wall-shaped support portion 6 is provided at an intermediate position in the axial direction, and a pressure receiving member 7 is provided on the right side thereof. The support section supports the supply pipe while permitting relative rotation with a liquid-containing substance supply pipe described later, and prevents backflow of the liquid-containing substance discharged from the supply pipe. The pressure receiving member 7 includes a disc member 7A and a turning member 7B.
And The pressure receiving member 7 rotates in the direction A as shown in FIG. 2, and a plurality of spiral blade-shaped deflection members 7B function like an impeller of a pump.

The inner cylinder 1 is provided with the support 6 in the axial direction.
Openings 8 are formed between the pressure receiving member 7 and a plurality of positions in the circumferential direction.

Further, a screw conveyor 9 is mounted on the outer peripheral surface of the inner cylinder 1. The screw conveyor 9 forms a spiral that transfers the substance to the left when the inner cylinder 1 rotates in the direction A shown in FIG. The outer diameter of the screw conveyor 9 is equal in the right half and gradually decreases toward the left end in the left half so as to conform to the shape of an outer cylinder described later.

The outer tube 2 forms a conical tube portion 2B whose right half is a cylindrical portion 2A and whose left half is a small diameter toward the left end along the outer diameter of the screw conveyor 9. The screw conveyor 9 attached thereto is completely surrounded. The first outlet 10 is provided at the minimum diameter portion of the conical cylinder portion 2B, and the second outlet 1 is provided at the side wall 11 of the cylindrical portion 2A.
2 are formed. The second outlet 12 is the first outlet 1
Generally, it is located closer to the axis in the radial direction than zero.

The outer cylinder 2 is rotatably supported by bearings 3 at the small-diameter portions at both ends, and is rotated by a pulley 13 in the same direction as the inner cylinder 1 with a speed difference from the inner cylinder 1. Have been driven to

At one end of the outer cylinder 2, a liquid-containing substance supply pipe 14 is provided.
Is penetrated, and its tip projects from the support portion 6 of the inner cylinder 1 and is close to the pressure receiving member 7. The liquid-containing substance supply pipe 14 is non-rotating, and is supported by the outer cylinder 2 near the pulley 13 and by the support 6 while allowing relative rotation.

In the apparatus of this embodiment, the liquid-containing substance is separated in the following manner.

A liquid-containing substance is supplied into the inner cylinder 1 through a liquid-containing substance supply pipe 14. The liquid-containing substance is
It is discharged toward the pressure receiving member 7 and stays in the space between the pressure receiving member 1 and the support portion 6. The pressure receiving member 7 has a diverting member 7B that forms a rotating spiral blade.
Efficiently directs the flow of the liquid-containing substance to the outside of the radius. That is, the liquid-containing substance receives centrifugal force by receiving the rotational energy of the inner cylinder 1.

The liquid-containing substance flows radially outward, flows out of the inner cylinder 1 through the opening 8 of the inner cylinder 1, and reaches the annular space between the inner cylinder 1 and the outer cylinder 2. Since the inner cylinder 1 and the outer cylinder 2 are rotating, the liquid-containing substance further obtains a centrifugal force to form a layer on the inner wall surface of the outer cylinder 2. As a result, the concentrated substance is collected radially outward and the separated liquid is separated so that it is radially inward with respect to the concentrated substance.

In the above-mentioned annular space, the screw conveyor 9 attached to the inner cylinder 1 is rotating, and the concentrated substance is conveyed toward the conical section 2 B of the outer cylinder 2, and the condensed substance is transferred from the first discharge port 10 to the outer cylinder 2. It is discharged outside. Separation liquid is supplied to the second outlet 1
Exhausted from 2.

According to the present invention, as described above, the liquid-containing substance receives a part of the energy of the inner cylinder 1 rotated by the deflecting member 7B before reaching the annular space to obtain a centrifugal force in advance. In addition, energy utilization becomes extremely efficient. The angle, shape, number, and the like of the blades are appropriately set according to operating conditions.

[0028]

As described above, according to the present invention, a part of the rotational energy of the inner cylinder can be given to the liquid-containing substance as a centrifugal force, so that the efficiency of energy application is improved and the apparatus is suitable for energy saving measures. Becomes It also contributes to downsizing of the device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a device including an axis of an embodiment of the present invention.

FIG. 2 is a side view of a pressure receiving member of the apparatus in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 7 Pressure receiving member 7B Deflection member 8 Opening 9 Screw conveyor 10 First discharge port 12 Second discharge port 14 Liquid-containing substance supply pipe

Claims (4)

[Claims] An inner cylinder that rotates about a substantially horizontal axis;
A rotating outer cylinder that forms an annular space between the inner cylinder and the inner cylinder.The inner cylinder has an opening at one end in the axial direction, a closed portion at the other end, and an opening at the middle. The internal space of the inner cylinder and the annular space are communicated with each other, and the outer cylinder has a first discharge port formed on a peripheral wall on one end side and a second discharge port formed on a side end wall on the other end side. The inner tube or the outer tube is provided with a conveyor that conveys the liquid-containing substance in the annular space toward one end, and a liquid-containing substance supply pipe that penetrates one end of the outer cylinder is opened from the opening of the inner cylinder. The inner cylinder has a pressure receiving member facing the discharge port of the liquid-containing substance supply pipe and receiving the discharged liquid-containing substance, wherein the pressure-receiving member is disposed so as to enter along the axis in the inner space of the inner cylinder. Is provided with a deflecting member for deflecting the flow of the discharged liquid-containing substance in the radial direction, and the opening is formed in the axial direction. Centrifuge apparatus liquid content material, characterized in that located between the support portion of the discharge port of the diverting member and the liquid content material supply pipe at. 2. The centrifugal separator for liquid-containing substances according to claim 1, wherein the deflection member is a spiral-shaped blade centered on the axis. 3. The centrifugal separator for liquid-containing substances according to claim 1, wherein the outer cylinder has a conical cylinder portion whose radius gradually decreases toward one end. 4. The apparatus according to claim 1, wherein the conveyor is a screw conveyor.