JPH0647084B2 - centrifuge - Google Patents

Description

TECHNICAL FIELD The present invention relates to a centrifuge in which the liquid surface position can be freely adjusted from the outside during operation and the liquid can be discharged under pressure. is there.

[Prior Art] FIG. 6 shows an outline of a conventional screw decanter type centrifugal separator, in which a screw conveyor 2 is concentrically arranged in a rotary cylinder 1 having one end tapered.
The screw conveyor 2 and the screw conveyor 2 are supported so that they can rotate independently of each other. Screw conveyor 2
The hollow shaft is provided with a discharge port 4, and the feed pipe 3 is inserted inside the hollow shaft. On the other hand, the rotating cylinder 1
The discharge port 5 for discharging the separated solid content is provided on the small diameter side of the, and the discharge port 6 provided on the other end large diameter side is provided with a weir plate 6a for discharging the clarified liquid. .

In the above centrifuge, the slurry supplied from the feed pipe 3 is discharged into the rotary cylinder 1 through the discharge port 4 provided in the hollow shaft of the screw conveyor 2, and is separated into a clarified liquid and a solid content there. The solid content is discharged to the outside of the machine from the discharge port 5 on the small diameter side of the rotating cylinder by the screw conveyor 2, and the clarified liquid overflows the weir plate 6a of the discharge port 6 on the large diameter side of the rotating cylinder.

At this time, in order to improve the drainage of the solid content, it is necessary to lengthen the drainage portion 1b of the rotary cylinder 1 by setting the liquid surface L on the outer diameter side. In order to improve the clarity of the liquid discharged on the other surface, it is necessary to increase the liquid hold amount by setting the liquid surface L to the inner diameter side.

In order to adjust the liquid level L, in the above-mentioned conventional apparatus, the centrifuge must be temporarily stopped and the weir plate 6a must be replaced, which causes a problem that the operation is complicated.

As a conventional device for solving the above problem, FIG.
(A) (b), those using a skimming pipe as shown in FIG. 8 (a) (b), and those using a centripetal pump as shown in FIG. 9 (a) (b) (for example, Japanese Patent Publication No. 50-6667).

In the system shown in FIGS. 7 (a) and 7 (b), the suction pipe 22 having a tip protruding inside the rotary cylinder 1 is rotatably mounted on the casing 23, and the suction pipe 22 is rotated to rotate the suction pipe 22. The tip is changed to adjust the liquid level L.

The method shown in FIGS. 8 (a) and 8 (b) is for adjusting the liquid level by expanding and contracting the suction pipe 24 having a protruding end inside the rotating cylinder 1 in the axial direction thereof to displace the end thereof. Is.

In the system shown in FIGS. 9 (a) and 9 (b), the circular plate 25 rotatably supported in the rotary cylinder is rotated to displace the suction passage port 25a provided in the circular plate, and It is intended to adjust L.

[Problems to be Solved by the Invention] However, the above-described conventional device has the following various problems.

That is, in FIGS. 7A and 7B, the curvature of the free surface of the liquid and the curvature of the suction pipe are ideal in terms of hydrodynamics.
Since there is only one point, the turbulence of the liquid flow is large at positions other than that point, and the flow path resistance of the suction pipe becomes very large.

Further, in the case shown in FIGS. 8 (a) and (b), it is impossible to match the curvature of the suction pipe with the curvature of the free surface of the liquid, and the liquid flow is disturbed. Grows very large.

Further, in both of FIG. 7 (a) (b) and FIG. 8 (a) (b), the space occupied by the suction pipes on the mechanism is restricted, and the suction port position when multiple suction pipes are provided is synchronized. There are restrictions such that it is structurally difficult to tune them, the cross-sectional area of the suction pipe cannot be expanded, and it is impossible to reduce the suction pipe flow resistance.

Furthermore, in the case shown in FIGS. 9 (a) and 9 (b), the inflow state of the liquid is affected by the change of the angle α with respect to the liquid surface of the suction passage, but the turbulence of the liquid flow is small. Only in the case of the positional relationship shown in the figure (b), the turbulence of the liquid flow becomes large and the inlet resistance becomes large at other positions. In any of FIGS. 7 to 9, if the turbulence of the liquid flow is large, bubbles are liable to be generated when handling the foaming liquid, and it is necessary to perform the defoaming operation in the subsequent step. The slurry liquid in the centrifuge, along with the rotating cylinder,
It usually rotates at a high speed of 2000 to 4000 rpm, but Fig. 9
(A) When the disc 25 deeply penetrates into the liquid as shown in (b), a large disturbance is caused in the slurry liquid, and the separation performance of the centrifugal separator is deteriorated. Since only one intake port can be provided in this system due to the mechanism, the cross-sectional area of the intake passage cannot be increased as in the skimming pipe system, and the liquid level fluctuates as the slurry supply increases, but the separation performance of the centrifuge is increased. In order to maintain the dehydration performance of solids, it is necessary to keep the liquid level constant and the position of the suction pipe suction port must be adjusted frequently.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to allow the liquid surface position to be freely adjusted from the outside during operation, and to allow the clear liquid to be discharged under pressure.

[Means for Solving the Problems] In the present invention, a centripetal pump, which is provided with a drainage chamber at the large-diameter end of the rotary cylinder and has a drainage inlet opening in the drainage chamber, is provided outside the rotary cylinder large-diameter portion. The centripetal pump is provided with a meniscus guide having a drainage passage and a meniscus guide groove at the large diameter end of the rotating cylinder, and a meniscus having a drainage suction port in the meniscus guide groove. 14
And a drive disk having a cam groove for guiding a pin projecting from the rear surface of the meniscus 14 is fitted to the outer periphery of the boss of the meniscus guide so as to be rotatable by a handle, for example. is there.

[Operation] When the drive disc is rotated by the handle, the pin is guided by the cam groove, so that the meniscus moves in the radial direction along the guide groove of the meniscus guide, and the suction port provided in the meniscus. The position of is continuously changed from the inner diameter side to the outer diameter side.

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

1 to 5 show an embodiment of the present invention, which is a rotary cylinder 1
A drainage chamber 10 is provided on the side surface of the large-diameter end portion of the rotary cylinder 1 for holding the clarified liquid discharged from the rotary cylinder 1 through the discharge port 6, and centripetal that sends the liquid sucked from the drainage chamber 10 to the liquid collection chamber 12. The pump 11 is arranged concentrically with the rotary cylinder 1 outside the large diameter side end of the rotary cylinder 1.

Explaining the details of the centripetal pump 11, the drive disk 16 that can be rotated by, for example, a handle 17 is provided on the boss outer circumference of the meniscus guide 15 having a drainage passage 15a from the drainage chamber 10 to the liquid collection chamber 12. The drive disc 16 with a third
As shown in FIGS. 4 and 5, a curved cam groove 16a extending from the inner peripheral side of the disc toward the outer peripheral side is provided, and the meniscus guide 15 is provided.
A pair of meniscus with a suction port 14b in its guide groove 15b
14 is fitted so as to be slidable in the radial direction along the guide groove 15b, and the pin 14a is projected to the pair of meniscus plates 14, and the pin 14a is fitted in the cam groove 16a of the drive disk 16. It is fitted so that the rotational angle displacement of the drive disc 16 can be converted into the radial displacement of the meniscus 14 via the cam groove 16a and the pin 14a. The cam groove 16a is curved so that the rotational angle displacement of the drive disc 16 and the radial displacement of the meniscus 14 are directly proportional.

Further, the meniscus 14 is provided with a spiral liquid passage 14c formed so as to minimize the turbulence of the liquid flow and suck the liquid.
The liquid sucked into the liquid passage 14c from the drainage chamber 10 through the suction port 14b is sent to the liquid collection chamber 12 from the liquid passage 14c through the liquid passage 15a.

When the drive disk 16 is rotated by operating the handle 17, the pin 14a is guided by the cam groove 16a, so that the meniscus 14 moves in the radial direction along the guide groove 15b of the meniscus guide 15,
The position of the suction port 14b provided in the meniscus 14 can be continuously changed from the inner diameter side shown in FIG. 3 to the outer diameter side shown in FIG. Therefore, the liquid level can be changed freely during operation, and the suction port 14b
The turbulence of the liquid passing through the liquid passage 14c is minimized regardless of the position of the liquid.

In addition, in the embodiment of the present invention, the case where the movement of the meniscus is performed by the pin and the cam groove has been described. However, not limited to this, various cam mechanisms can be adopted, and the scope of the present invention is not deviated. That you can make various changes within
Of course, etc.

[Effects of the Invention] Since the centrifuge of the present invention has the configuration as described above, it can exhibit various excellent effects as described below.

(I) The liquid level can be freely adjusted from the outside without the need to stop during operation.

(II) Regardless of the position of the suction port, turbulent flow can be minimized and liquid can be discharged.

(III) Since the suction ports can be provided at two places, there is little change in the liquid level even when a large flow rate is passed.

(IV) Since only a small part of the meniscus penetrates into the liquid, it does not disturb the separation performance by disturbing the liquid.

(V) Since it has a centripetal pump built-in type, it does not require a separate pressurizing device to obtain pressurized drainage and deliver the fluid to a high place.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the centrifuge of the present invention, FIG. 2 is a detailed view of a centripetal pump used in the centrifuge of the present invention, and FIG. 3 is an A of FIG. FIG. 4 is an explanatory view of the state where the meniscus is contracted, FIG. 4 is an explanatory view of the state where the meniscus is enlarged, and FIG. 5 is a centripetal pump configuration used in the centrifuge of the present invention. Fig. 6 is a three-dimensional view of the parts, Fig. 6 is an explanatory view of a conventional screw decanter type centrifuge, and Fig. 7 (a) (b).
8 (a) and (b) are explanatory views of an example of a conventional centrifuge using a skimming pipe, and FIG. 9 (a) (b) is an example of a conventional centrifuge using a centripetal pump. FIG. In the figure, 1 is a rotating cylinder, 2 is a screw conveyor, 3 is a feed pipe, 10 is a draining chamber, 11 is a centripetal pump, 12 is a collecting chamber, 14 is a meniscus, 14a is a pin, 14b is an inlet, 14c is Liquid passage, 15 is a meniscus guide, 15a is a drain passage, 15b is a guide groove, 16 is a drive disc, 16a is a cam groove, and 17 is a handle.

Claims (1)

[Claims] 1. A drive disk, which is concentric with the rotary cylinder and is rotatable by an external operation, is arranged at an end of the rotary cylinder on the large-diameter side, and an inner circumference of a hollow part of the drive disk is provided. , A meniscus guide having a guide groove extending in the radial direction of the rotating cylinder is fitted, and a meniscus having a liquid passage for discharging liquid from the large diameter side of the rotating cylinder to the outside is fitted in the guide groove of the meniscus guide. A centrifuge characterized in that a cam mechanism, which is slidably fitted and moves the meniscus along the guide groove in a radial direction of the rotating cylinder, is provided between the drive disc and the meniscus.