JPS61278370A - Centrifuge - Google Patents

Abstract

PURPOSE:To regulate a liquid level from the outside and to enable the discharge of a liquid in a pressurized state by rotating a driving disk with a handle, transferring a semilunar plate in a radiation direction along the guide groove of disk and changing the position of suction port of a semilunar plate from the inside to the outside. CONSTITUTION:In relation to a centrifuge, a waste liquid chamber 10 wherein a clean liquid discharged from a rotary cylinder 1 is stored therein is provided to the side of a large-diameter end part of the rotary cylinder 1 and a centripetal pump 11 of the waste liquid chamber 10 is provided concentrically with the rotary cylinder 1 to the outside of the large-diameter side end part of the rotary cylinder 1. A waste liquid passage 15a and the guide groove of the semilunar plate are provided to the centripetal pump 11 and the semilunar plate 14 is slidable engaged with the guide groove of the semilunar plate and a driving disk 16 which is provided with a cam groove guiding a pin 14a projected from a rear surface of the semilunar plate 14 is rotated with a handle 17. In such a way, the semilunar plate is transferred in the irradiation direction and the position of the suction port is continuously changed from the inside to the outside and the liquid level is freely regulated from the outside to discharge the clean liquid.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a centrifugal valve 1i11 which allows the liquid level position to be freely adjusted from the outside during operation and which enables liquid discharge under pressure.
It is related to the lord.

[Prior art 1] Fig. 6 schematically shows a conventional screw decanter type centrifugal separator, in which a screw conveyor 2 is disposed concentrically within a rotating cylinder 1 having a tapered end.
The screw conveyor 2 and the screw conveyor 2 are each supported to rotate independently and rotate 1q. A discharge port 4 is bored in the hollow shaft of the screw conveyor 2, and a foot pipe 3 is inserted into the hollow shaft. On the other hand, a discharge port 5 for discharging the separated solids is provided on the small diameter side of the rotating cylinder 1, and a discharge port 6 provided on the large diameter side of the other end is provided with a
A weir plate 6a for discharging M'tU liquid is provided.

In the centrifugal separator described above, the slurry supplied from the feed pipe 3 is discharged into the rotating cylinder 1 from the discharge port 4 provided in the hollow shaft of the screw conveyor 2, where it is separated into a clear liquid and a solid content. The solid content is discharged by the screw conveyor 2 through the discharge port 5 on the small diameter side of the rotating cylinder, 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 removal of solids, it is necessary to make the liquid removal portion 1b of the rotating cylinder 1 longer by setting the liquid level on the outer diameter side. On the other hand, in order to improve the clarity of the discharged liquid, it is necessary to increase the amount of liquid held by setting the liquid level on the inner diameter side.

In order to adjust the liquid level, in the conventional apparatus described above, the centrifugal separator must be temporarily stopped and the weir plate 6a must be replaced, so there is a problem that the operation is complicated.

A conventional device for solving the above problem is shown in Fig. 7 (
A) (B), those using skimming pipes as shown in Figure 8 (A) and (O), and those using centripetal pumps as shown in Figures 9 (A) and (B) (for example, special Kosho 50
-6667@).

In the system shown in FIGS. 7(a) and 7(b), a suction pipe 22 whose tip protrudes inside the rotating cylinder 1 is inserted into a casing 2.
3, and by rotating the suction pipe 22, its tip can be changed to adjust the liquid level.-5
It is.

The system shown in FIGS. 8(a) and 8(b) is a system in which a suction pipe 24 with a protruding tip is expanded and contracted in the axial direction inside the rotating cylinder 1 to displace the tip and adjust the liquid level. It is.

The method shown in FIG. 9(a)(+]) rotates a disc 25 rotatably supported in a rotating cylinder to displace the suction passage opening 25a provided on the disc, and liquid This is to adjust the surface.

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

In other words, in the case shown in Figures 7(a) and 7(b), there is only one point where the curvature of the free surface of the liquid and the curvature of the suction pipe are ideal in terms of fluid dynamics. At this position, the turbulence of the liquid flow is large, and the flow path resistance of the suction pipe becomes extremely large.

In addition, in the case shown in Fig. 8 (a) < 11), it is impossible to match the curvature of the suction pipe to the curvature of the free surface of the liquid, and the liquid flow is turbulent, so the flow path resistance of the suction pipe is increased. becomes very large.

In addition, both methods shown in Figures 7 (a) (b) and 8 (a) and (b) are mechanically limited by the space occupied by the suction pipes, and when multiple suction pipes are installed, the suction port positions must be synchronized. There are constraints such as the structural difficulty of synchronization, and it is not possible to expand the cross-sectional area of the suction pipe, making it impossible to reduce the resistance of the suction pipe flow path.

Furthermore, in the case shown in FIG. 9(a) ([1), the inflow state of the liquid is affected by the change in the angle α of the suction passage with respect to the liquid level, but the reason why the liquid flow is less turbulent is that Only in the case of the positional relationship shown in FIG. 9 (0), the turbulence of the liquid flow becomes large at other positions, and the inlet resistance becomes large. Figures 7 to 9
In any of the cases shown in the figure, if the turbulence of the liquid flow is large, foam is likely to be generated when a foaming liquid is handled, making it necessary to carry out a defoaming operation in a subsequent process. The slurry liquid in the centrifuge, along with the rotating cylinder, is usually 2000 to 4000 r, D, m,
However, as shown in Figure 9 (a) (0), when the disk 25 penetrates deeply into the slurry, it causes a large disturbance in the slurry, causing separation in the centrifuge. Decreases performance. This method also has only one entrance for the upper limit of v4 buildings [
Since the suction passage cross-sectional area cannot be increased like the skimming pipe method, and the liquid level fluctuates as the slurry supply amount increases, the separation performance of the centrifuge and the dewatering performance of solids can be maintained. In addition, the liquid level must be kept constant, and the position of the suction pipe inlet must be adjusted frequently.

In view of the above-mentioned circumstances, it is an object of the present invention to make it possible to freely adjust the liquid level position from the outside during operation, and to discharge the clarified liquid under pressure.

[Means for Solving the Problems] In the present invention, a drainage chamber is provided at the large diameter end of the rotating cylinder, and a centripetal pump having a drainage suction port opened in the drainage chamber is provided outside the large diameter portion of the rotating cylinder. The centripetal pump includes a meniscus guide having a drainage passage and a meniscus guide groove disposed at the large diameter end of the rotating cylinder, and a meniscus guide having a drainage passage and a meniscus guide groove provided at the large diameter end of the rotating cylinder; A driving disk with a cam groove for slidingly fitting the plates 14 and guiding a pin protruding from the back surface of the meniscus 14 is formed by fitting onto the outer periphery of the boss of the meniscus guide so that it can be rotated by, for example, a handle. It is something.

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

[Example] 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, in which a rotating cylinder 1
A drain chamber 10 for retaining the clarified liquid discharged from the rotating cylinder 1 through the discharge port 6 is provided on the side surface of the large diameter end of the drain chamber 1.
Centripetal pump 11 that sends the liquid sucked from 0 to the liquid collection chamber 12
is arranged concentrically with the rotating cylinder 1 outside the large diameter end of the rotating cylinder 1.

To explain the details of the centripetal pump 11, the drainage chamber 10
A drive disc 16 that can be rotated by, for example, a handle 17 is fitted onto the outer periphery of the boss of the meniscus guide 15, which has a drainage passage 15a extending from the fluid collection chamber 12 to the fluid collection chamber 12. As shown in FIGS. 3 and 4, a curved cam 116a extending from the inner circumferential side of the disc toward the outer circumferential side is provided,
Information on the meniscus guide 15? ? 415b, inlet 1
A pair of meniscuses 14 having 4b are fitted together so as to be able to move once in the radial direction along the guide groove 15b, and a pin 14a is made to protrude from the pair of meniscus 14. 14a is substituted into the cam groove 16a of the driving disk 16, so that the rotational angular displacement of the driving disk 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 has a curve such that the rotational angular displacement of the drive disk 16 and the displacement of the meniscus 14 in the radial direction are directly proportional.

In addition, the meniscus 14 is provided with a spiral liquid passage 14c formed so that liquid can be sucked while minimizing turbulence in the liquid flow. The sucked liquid is sent from the liquid passage 14c to the liquid collection chamber 12 through the liquid passage 15a.

When the handle 17 is operated to rotate the drive disk 16,
Since the pin 14a is guided by the cam groove 16a, the meniscus 14 moves in the radial direction along the guide groove 15b of the meniscus guide 15, and the position of the inlet 14b provided in the meniscus 14 is as shown in FIG. It can be changed continuously from the inner diameter side shown to the outer diameter side shown in FIG.

Therefore, the liquid level can be changed freely during operation, and no matter where the suction port 14b is located, the turbulence of the liquid passing through the liquid passage 14c is minimized.

In addition, in the embodiment of the present invention, a case has been described in which the meniscus is moved using a pin and a cam groove, but the invention is not limited to this, and various cam mechanisms can be used! Of course, various changes may be made without departing from the spirit of the present invention.

[Effects of the Invention] Since the centrifugal separator of the present invention has the above-described configuration, 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.

<n> Liquid can be discharged with minimal turbulence no matter where the suction port is located.

([l) Since the suction ports can be provided at two locations, there is little change in the liquid level even when a large flow rate is applied.

■ Since only a small portion of the meniscus penetrates into the liquid, it does not disturb the liquid and impede separation performance.

(V) Since it has a built-in centripetal pump, pressurized drainage can be obtained and no separate pressurizing device is required to deliver the liquid to high places.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the centrifugal separator of the present invention, FIG. 2 is a detailed diagram of the centripetal pump used in the centrifugal separator of the present invention, and FIG. 3 is an illustration of the centrifugal separator of the present invention. The A-A arrow view is an explanatory diagram of the meniscus in a contracted state, FIG. 4 is an explanatory diagram of the same meniscus in an enlarged state, and FIG. 5 is an explanatory diagram of the centripetal pump used in the centrifugal separator of the present invention. A three-dimensional view of the component parts, Figure 6, is an explanatory diagram of a conventional Sufu 1 decanter type centrifuge, Figure 7 (
A) (B) and Figure 8 (Ibaro) are explanatory diagrams of an example of a conventional centrifugal separation chamber using a skimming pipe, and Figure 9 (
(a) and (b) are explanatory diagrams of an example of a conventional centrifugal separator using a centripetal pump. In the figure, 1 is a rotating cylinder, 2 is a screw conveyor, 3 is a feed pipe, 10 is a drain, 11 is a centripetal pump, 12 is a liquid collection point, 14 is a meniscus, 14a is a pin, 14b is an inlet, 14C is a 15 is a meniscus guide, 15a is a drain passage, 15b is a guide groove, 16 is a drive disk, 16a is a cam groove, and 17 is a handle.

Claims (1)

[Claims] 1) At the end of the large diameter part of the rotating cylinder, concentrically with the rotating cylinder,
A driving disk that can be rotated by external operation is provided, a meniscus guide having a guide groove extending in a radial direction of the rotating cylinder is fitted into the inner periphery of a hollow part of the driving disk, and the meniscus is rotated by an external operation. A meniscus having a liquid passage for discharging liquid from the large diameter side of the rotating cylinder to the outside is slidably fitted into the guide groove of the guide, and the meniscus is moved in the radial direction of the rotating cylinder along the guide groove. A centrifugal separator characterized in that a cam mechanism for movement is provided between the drive disk and the meniscus.