JPH02277565A - Continuous discharge type centrifugal separator - Google Patents

Abstract

PURPOSE:To judge the state of clogging in a centrifugal separator according to the change of the water quantity in a liquid seal mechanism by providing the liquid seal mechanism between a revolving vowl and a feed pipe. CONSTITUTION:An annular water storage part 30 is provided at the end part of the revolving bowl 10, and an annular plate member 32 is fixed to the feed pipe 18 so as to be set in the water storage part 30. When water is supplied into the revolving annular water storage part 30 from the outlet 34c of a water supply pipe 34b, the water is kept in the annular water storage part 30 by the centrifugal force. When the inside of the centrifugal separator has negative pressure and the inside of a supply chamber 16 gets a certain degree of vacuum, the water in the annular water storage part 30 is sucked into the inner part of the centrifugal separator. If water is continuously supplied into the annular water storage part 30 and the liquid seal function is kept without the overflow of water, the inside of the centrifugal separator is kept in a negative pressure which shows that the inside of the supply chamber 16 is not clogged. Thus, by the change of the water quantity in the liquid seal mechanism or by the degree of overflow, it is allowed to measure the degree of vacuum in the slurry supply chamber 16 or to judge the state of clogging.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous discharge centrifugal separator for separating slurry (sludge) into separated sludge and separated liquid. This invention relates to a continuous discharge centrifuge equipped with a mechanism for investigating blockage due to

[Prior Art] A continuous discharge centrifugal separator as shown in FIGS. 3 and 4 has a rotating ball 10 and a screw shaft portion 12 disposed on the same axis inside the rotating ball 10. A screw blade part 14 is spirally attached to the outer periphery of the shaft part 12.

A slurry supply chamber 16 is provided in the screw shaft portion 12,
A feed pipe 18 is inserted from one end of the rotating ball 1o into the screw shaft portion 12 in the axial direction and reaches the slurry supply chamber 16.

The slurry supply chamber 16 has a discharge port 20 , and the space between the blades of the screw blade portion 14 communicates with the slurry supply chamber 16 via the discharge port 20 .

Therefore, as shown by arrow A, the slurry (sludge) charged from the slurry supply chamber 16 via the feed pipe 18 is
It enters the screw blade portion 14 from the discharge port 20.

Although the rotating ball 10 and the screw blade part 14 rotate in the same direction, a differential speed (rotational speed difference) is provided between the rotations of the rotating ball 10 and the screw blade part 14.

In this process, first, the slurry that is not supplied into the screw blade portion 14 is separated into separated sludge and separated M liquid by the centrifugal force of the rotating ball 10 and the screw blade portion 14. Then, the separated sludge settles on the inner circumferential surface 10a of the rotating ball 10, and is transferred to the third
Transported to the right side of the figure? The sludge is compressed and discharged to the outside from the separated sludge discharge port 22 at one end of the rotating ball 10 as shown by arrow B. In addition, the separated liquid is
The liquid flows through the flow path between the blades 4 and overflows from the separated liquid outlet 24 at the other end of the rotating ball 10, that is, on the left side in FIG. 3, and is discharged to the outside.

[Problems to be Solved by the Invention] In the continuous discharge type centrifugal separator as described above, when slurry is continuously supplied to the slurry supply chamber, foreign matter in the slurry accumulates in the slurry supply chamber, and eventually the discharge port The slurry supply chamber may become clogged with foreign matter until it is blocked.

However, since the inside of the centrifuge cannot be visually inspected, it is not possible to determine if the slurry supply chamber is clogged due to accumulation of foreign matter. It often happens that instead of being fed out, it overflows from the gap between the feed pipe and the screw shaft.

When the slurry supply chamber becomes blocked, an extremely large amount of work is required to release the blockage, such as disassembling the centrifuge.

Therefore, if the blockage is checked periodically, it can be easily cleaned from the outside using pressurized water without disassembling the machine.

For this purpose, in the past, the feed pipe was removed and the inside was looked into using a fiberscope or the like to investigate the blockage situation.

However, this type of investigation tends to be large-scale as it requires removing the feed pipe and inserting a fiberscope or the like.

The present invention has been made to solve such problems, and is designed to install a liquid seal mechanism between the rotating ball and the feed pipe, and to determine the blockage situation based on changes in the amount of water in the liquid seal mechanism. It is something that

[Means for Solving the Problems] A continuous discharge centrifuge according to the present invention is provided with a slurry inflow hole, a separated sludge discharge port, and a liquid discharge port, and is rotatably supported at both ends in the axial direction. a screw that is coaxially disposed inside the ball and has a shaft portion that has a slurry supply chamber and a blade portion that communicates with the slurry supply chamber; In a centrifugal M machine having an inserted feed pipe and configured to rotate the rotary ball and the screw in the same direction with a differential speed, the one end of the rotary ball An annular water storage section provided;
A liquid seal mechanism is provided, which includes an annular plate member attached to the feed pipe so as to enter the annular water storage part, and a water supply device provided on the axially outer side of the annular plate member to supply water to the annular water storage part. be.

[Function] In the continuous discharge centrifuge according to the present invention, during operation,
The negative pressure inside the centrifuge is transmitted through the gap between the screw shaft and the feed pipe, and the water in the annular water storage part of the liquid seal mechanism installed between the rotating ball and the feed pipe at one end of the rotating ball is transmitted. is sucked into the centrifuge.

Therefore, in this condition, water must be supplied from an external water supply to the annular reservoir in order to maintain the liquid seal. Conversely, if the liquid seal can be maintained by continuing to supply water from the water supply device to the annular water storage section, this indicates that the negative pressure within the centrifuge is maintained.

However, if negative pressure is no longer transmitted through the gap between the screw shaft and the feed pipe due to blockage in the centrifuge, the water supplied from the water supply device to the annular water storage section will not be sucked into the centrifuge, and the annular water storage It starts to overflow from the area.

Therefore, it can be determined that a blockage or the like has occurred in the centrifuge based on a change in the amount of water in the liquid seal mechanism.

[Example] To explain the example with reference to the drawings, the centrifugal separator shown in FIGS. 1 and 2 has a rotary ball 10, a screw shaft portion 12, and a screw A feed pipe 18 is inserted from one end of the rotary ball 10 into a slurry supply chamber 16 in the screw shaft 12 . The slurry supply chamber 16 communicates with the screw blade portion 14 via the discharge port 20.

This end of the rotating ball 10 is supported by a bearing 26, and rotational force is transmitted from the drive pulley 28 to the rotating ball 10, causing the rotating ball 10 to rotate.

It goes without saying that the opposite end of the rotating ball 10 in the axial direction is also supported by a similar bearing (not shown).

Furthermore, the slurry supply chamber 16 has a conical shape which narrows towards the end of the rotary ball 10 on the right side as viewed in the drawing. The tapered portion of the screw shaft 12 near the end of the rotary ball 10 is coaxial with the feed pipe 18 and can rotate around the feed pipe 18 with a small gap.

Furthermore, in this embodiment, a liquid seal mechanism is provided at one end of the centrifuge, as described below.

That is, an annular water storage section 30 is provided at the end of the rotary ball 10 outside the driving Zuri 28, and an annular plate member 32 is attached to the feed pipe 18 and extends radially outward to form the annular water storage section 30. It's getting into.

Since the feed pipe 18 is a stationary member, the annular plate member 32 is stationary, but the annular water storage portion 30 is a stationary member.
It will be clear that it rotates with the rotation of 0.

Furthermore, a water supply device 34 is configured to supply water to the annular water storage portion 30.
is provided outside the centrifuge.

The water supply device 34 includes a water supply container 34a and a water supply tube 34b.
The outlet 34c of the water supply tube 34b is fixed to the feed pipe 18 so as to supply water to the annular water storage portion 30 from the axially outer side of the annular plate member 32.

Therefore, the water supply tube 34b to the rotating annular water storage section 30
It will be seen that when water is supplied from the outlet 34c of the annular water reservoir 30, water is retained within the annular reservoir 30 by centrifugal force.

Furthermore, a water flow control valve 34d is provided in the water supply container 34a so as to maintain the water level 36 within the annular water storage portion 30.

The operation of this embodiment will be explained next.

When the centrifugal separator configured as above is operated, the third
In the same machine as in the case of FIG. Separated sludge and separated liquid are separated by force. Then, the separated sludge settles on the inner circumferential surface 10a of the rotating ball 10, and the screw blade portion 14
and is discharged from the separated sludge discharge port 22 of the rotating ball 10. Further, the separated liquid passes through the flow path between the blades of the screw blade portion 14 and is discharged from the other end of the rotating ball 10 to the outside.

While the centrifugal separator is in operation, the inside of the centrifugal separator is under negative pressure and the inside of the slurry supply chamber 16 is at a constant degree of vacuum.

Then, negative pressure is applied to the screw shaft portion 1 from the slurry supply chamber 16.
It is transmitted to #trWi between 2 and feed pipe 18.

If there were no liquid seal mechanism of this embodiment, external air would be sucked through this gap, but in this embodiment,
Since the slurry supply chamber 16 is isolated from the outside by the liquid seal mechanism, water in the annular water storage section 30 is sucked into the centrifuge.

Therefore, in order to maintain the sealing function of the liquid seal mechanism, water must be continuously supplied from the water supply device 34 to the annular water storage section 30.

Conversely, even if water is continuously supplied from the water supply device 34 to the annular water storage section 30, if the water does not overflow from the annular water storage section 30 and the liquid seal function can be maintained, the negative pressure inside the centrifuge will decrease. This indicates that the slurry supply chamber 16 is maintained, that is, the inside of the slurry supply chamber 16 is not clogged.

However, contaminants accumulate in the slurry supply chamber 16,
As the discharge port 20 is closed, the degree of vacuum in the slurry supply chamber 6 decreases. Then, when the discharge port 20 is completely blocked, the supplied slurry is no longer sent toward the screw blade section 14, and finally, the slurry is delivered to the screw shaft section 12.
and the feed pipe 18.

In such a state, the negative pressure from the gap between the screw shaft portion 12 and the feed pipe 18 becomes weak or disappears, so that the annular water storage portion 30 is removed from the water supply device 34.
There is less or no suction of water into the centrifuge. In this way, the amount of water in the annular water storage section 30 increases to the point where it overflows to the outside.

Therefore, the degree of vacuum in the slurry supply chamber 16 can be measured or the blockage state can be determined based on changes in the amount of water in the liquid seal mechanism or changes in the degree of overflow.

Practically speaking, it is not necessary to operate the liquid seal mechanism all the time, and it is sufficient to supply water from the water supply device 34 to the annular water storage portion 30 to operate the liquid seal when investigating a blockage situation.

[Effects of the Invention] When the continuous discharge centrifugal separator configured as described above is operated, the state of blockage due to foreign matter in the centrifuge can be easily determined with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a continuous discharge centrifuge equipped with a liquid sealing mechanism according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a liquid seal mechanism provided in the slurry supply portion of the centrifugal separator shown in FIG. 1. FIG. Figure 3 shows a conventional continuous discharge centrifuge.
It is a front view. FIG. 4 is a partially cutaway vertical cross-sectional view showing the slurry supply portion of the centrifugal M machine of FIG. 3. FIG. (Margins below this page) In the figure, 10... 10a, 12... 14... 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36 ... Reference numbers refer to the following elements.・Rotating ball, ・Inner peripheral surface of rotating ball, ・Screw shaft, ・Screw blade, ・Slurry supply chamber, ・Feed-by 1, ・Slurry discharge port, ・Separated sludge discharge port, ・Separated liquid discharge port,・Bearing, ・Drive pulley, ・Annular water storage section, ・Annular plate member, ・Water supply device, ・Water level. Applicant Nishihara Environmental Health Research Institute Co., Ltd.

Claims (1)

[Claims] A rotating ball is provided with a slurry inflow hole, a separated sludge discharge port, and a separated liquid discharge port and is rotatably supported at both ends in the axial direction; a shaft portion coaxially disposed inside the rotating ball and having a slurry supply chamber; The rotary ball has a screw having a blade portion communicating with the slurry supply chamber, and a feed pipe inserted into the slurry supply chamber in the axial direction at one end of the rotary ball, and the rotary ball and the screw are connected at different speeds. In a centrifugal separator configured to rotate in the same direction, an annular water storage part provided at one end of the rotating ball, and a centrifuge attached to the feed pipe so as to enter the annular water storage part. 1. A continuous discharge centrifugal separator characterized by being provided with a liquid seal mechanism consisting of an annular plate member and a water supply device provided on the axially outer side of the annular plate member to supply water to an annular water storage portion.