KR20060053850A - Centrifuge - Google Patents

Abstract

According to the present invention, there is provided a centrifugal separator having a discharge switching mechanism with a compact installation space and a reduced installation cost.

Such a centrifugal separator is a centrifugal separator provided with a damper device which can be opened and closed on the cake inlet side of the discharge chute for discharging the cake, and the cake is discharged from the discharge chute 8 during the centrifugal separation step, and the damper device during the in-flight cleaning step. The damper 9D of (9) covers the cake inlet side of the discharge chute 8 so as to prevent the outflow of the cleaning liquid and the residual cake to the discharge chute 8.

Description

Centrifuge {CENTRIFUGE}

1 is a side cross-sectional view of a centrifuge.

2 is a front sectional view of the centrifuge (damper open state).

3 is a front sectional view of the centrifuge (damper closed state).

4 is a sectional front view (damper open state) of another embodiment of the damper device.

5 is a sectional front view (damper closed state) of another embodiment of the damper device.

6 is an explanatory diagram for explaining the flow of a centrifugal separation step and an in-flight cleaning step.

 <Explanation of symbols for the main parts of the drawings>

1: casing

2: slurry feed pipe

6: filtrate outlet

8: discharge chute

8A: plate-shaped member

8B: Mouse Tube

9: damper device

9A: Air Cylinder

9B: Piston Member

9C: Load

9D: Damper

10: washing liquid outlet

11: outer cylindrical basket

11A: external screen

11B: Retention Plate

11C: Support Arm

12: inner cylindrical basket

12A: internal screen

12B: Retention Plate

12C: Extruded part

13: Distributor Edition

14: first cleaning liquid supply pipe

14A: Cleaning Nozzle

15: second cleaning liquid supply pipe

15A: Cleaning Nozzle

16: cake receiving ring

16A: Cake Receiving Ring Bracket

16B: discharge pipe

19: damper device

19A: Air Cylinder

19B: piston member

19C: Load

19D: Damper

30: main shaft

31: extrusion shaft

32: piston

33: pulley

91: cover

92: opening

93: first port

94: second port

191: cover

193: first port

194: second port

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge, and more particularly, to a centrifuge having a damper device for preventing the outflow of a washing liquid and a residual cake.

Background Art Conventionally, centrifuges have various types such as conical and extruded types. Among these, the extruded centrifugal separator includes a rotating outer cylindrical basket and an inner cylindrical basket coaxially installed therewith, a wire screen or a plate screen fixed to each of the inner surfaces thereof, and an extruding of the inner cylindrical basket forward and an outer screen. And a continuous extrusion mechanism for extruding and discharging the cake separated in the phase.

The extruded centrifugal separator rotates a cylindrical basket provided around the inlet of the slurry to discharge the filtrate to the outside through a screen provided at the inner circumference of the basket, and at the same time forms a cake inside the screen to form an extrusion mechanism. This cake is extruded by (see, for example, Japanese Patent No. 2936270 Specification (2, 3 pages, Fig. 1)).

The centrifugal separator as described above forms a cake by a continuous operation for a predetermined time, but clogging of the screen occurs with the passage of time. Therefore, in-flight cleaning is performed regularly by spraying the cleaning liquid toward the screen or the like during the continuous operation to eliminate clogging of the screen and to wash the residual cake.

In-flight cleaning also requires that the cake be free of dirt (contamination), for example, that the cake and the filtrate are separated more reliably, and that the cake remaining on the screen is not mixed during the next centrifugation operation (filtration). It also has a purpose.

As a configuration corresponding to this cleaning, the cake container is removed from the outlet of the bottom of the centrifugal separator, the cleaning liquid slurry container is connected to the outlet port instead of the cake container, and the remaining slurry is recovered to the cleaning liquid slurry container together with the cleaning liquid. (See, for example, Japanese Patent No. 2936270 Specification (2, 3 pages, Fig. 1)). In addition, although the extruded centrifugal separator is not provided, there is a case in which a dedicated discharge switching device for selectively discharging solids and liquids is installed in the discharge chute of the centrifugal separator, thereby facilitating the switching operation by switching the discharge route. See, for example, Japanese Patent Application Laid-open No. Hei 10-76183 (pages 4 and 5, Fig. 1).

However, there existed the following problems in the structure corresponding to such conventional washing | cleaning. That is, in the former technique, it is necessary to selectively connect the cake receiving tank and the washing liquid slurry receiving tank to the discharge chute formed in the centrifuge, which requires a plurality of operators and requires a lot of effort and time. It was falling and productivity was inferior.

In addition, in the latter technique, the exhaust switching device is a large one, requires a large installation space in two and three dimensions, and has severe restrictions on the installation point. Moreover, in order to install this apparatus, it is necessary to also install the foundation, and installation cost became large.

Therefore, the main subject of this invention is providing the centrifuge which has a discharge switching mechanism which made the installation space compact and held down the installation cost.

The present invention which solved the said subject is as follows.

<Invention of Claim 1>

The invention according to claim 1 is a centrifugal separator provided with a damper device that can be opened and closed on a cake inlet side of a discharge chute for discharging a cake, wherein the cake is discharged from the discharge chute during a centrifugal separation step, and the damper device during an in-flight cleaning step. And a damper covering the cake inlet side of the discharge chute, to prevent the outflow of the cleaning liquid and the residual cake to the discharge chute.

(Action effect)

By providing a damper device that can be opened and closed on the cake inlet side of the discharge chute for discharging the cake, it is possible to prevent leakage of the cleaning liquid and residual cake to the discharge chute during the in-flight cleaning process only by controlling the opening and closing of the damper. This eliminates the need for a separate large-scale emission converter. In addition, since the washing | cleaning liquid and the residual cake do not flow into a discharge chute at the time of an in-flight washing process, even if it connects directly to a dryer installation etc. in a next process, the load of a dryer does not rise.

<Invention of Claim 2>

The invention according to claim 2 is a centrifugal separator having a rotating cylindrical basket and a screen fixed to an inner surface thereof, wherein the cake formed on the screen is discharged from a discharge chute through a cake receiving ring. A damper device is provided between the cake outlet side and the cake inlet side of the discharge chute, the cake is discharged from the discharge chute during the centrifugal separation process, and the damper of the damper device is discharged during the in-flight cleaning process. A centrifugal separator is provided which covers the cake inlet side of the chute and prevents outflow of the cleaning liquid and residual cake to the discharge chute.

<Invention of Claim 3>

The invention as set forth in claim 3 further comprises a rotating outer cylindrical basket and an inner cylindrical basket coaxially installed therewith, a screen fixed to each inner surface thereof, and a cake formed on the outer screen by extruding the inner cylindrical basket forward. A centrifugal separator having a continuous extrusion mechanism for extruding and discharging, wherein the extruded cake is discharged from a discharge chute through a cake receiving ring, the centrifugal separator being disposed between a cake outlet side of the cake accommodation ring and a cake inlet side of the discharge chute. A damper device capable of opening and closing is provided, the cake is discharged from the discharge chute during the centrifugal separation process, and during the in-flight cleaning process, the damper of the damper device covers the cake inlet side of the discharge chute, and the cleaning liquid and the residual cake Characterized in that it is configured to prevent the outflow to the discharge chute The core breaker.

(Action effect)

The invention described in claims 2 and 3 exhibits the same effects as the invention described in claim 1.

<Invention of Claim 4>

The invention according to claim 4, wherein the damper device comprises an air cylinder, a rod connected to a piston member provided in the air cylinder, and a damper connected to the rod, and controlling the opening and closing of the damper by supplying air into the air cylinder. It is the centrifugal separator in any one of Claims 1-3 which consists of a structure which consists of these.

(Action effect)

The opening and closing control of the damper is performed by supplying air into the air cylinder, so that switching work by an operator is unnecessary at the time of opening and closing the damper, and workability and productivity are improved. Further, by automatically controlling the air supply into the air cylinder, the centrifugal separation step and the in-flight cleaning step can be performed sequentially.

<Invention of Claim 5>

The invention according to claim 5 is the centrifugal separator according to claim 4, wherein the damper has a lid portion covering the cake inlet side and an opening communicating with the cake inlet side.

(Action effect)

The damper has a lid portion covering the cake inlet side and an opening communicating with the cake inlet side, and the piston member is moved by the air supply into the air cylinder to control the opening and closing of the damper. The opening of the damper is located above the cake inlet side so that the cake can be discharged from the discharge chute. During the in-flight cleaning process, the cover of the damper covers the cake inlet side to prevent leakage of the cleaning liquid and residual cake into the discharge chute. It can be a configuration.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

<Overall Configuration of Centrifuge According to the Present Invention>

First, the whole structure of embodiment of a centrifugal separator is demonstrated based on FIG.

In the centrifuge, the cylindrical casing 1 is fixed to the front part of the apparatus, and the outer cylindrical basket 11 and the inner cylindrical basket 12 are coaxially provided in this casing 1. On the inner surfaces of each of these baskets 11 and 12, an outer screen 11A and an inner screen 12A are fixed by fixing means such as bolts.

On the other hand, the outer cylindrical basket 11 is integrated by bolts to the holding plate 11B that is bolted to the tip of the main shaft 30, the output of the motor (not shown) to the pulley 33 It is rotated by transmission, and the outer cylinder basket 11 and the outer screen 11A are made to rotate in a circumferential direction.

As shown in FIGS. 1 and 2, the filtrate outlet 6 is formed on the side of the casing 1, and is centrifuged by the rotation of the outer cylindrical basket 11 and the inner cylindrical basket 12. The filtered filtrate (mother liquor) and a part of the washing liquid supplied at the washing step are discharged from the filtrate outlet 6.

Further, a discharge chute 8 through which the filtered cake is discharged is formed in the lower portion of the front side of the casing 1. The cake discharged here is made to be thrown into the drying machine etc. of the drying process which is the next process. As will be described later, a damper device 9 is attached to the side of the discharge chute 8 to enable the damper to be opened and closed, and furthermore, the cleaning solution and the residual cake, which are prevented from entering the discharge chute 8 by the damper during the cleaning process, The cleaning liquid outlet 10 discharged is formed in the front lower part of the casing 1.

On the other hand, in the main shaft 30, the extrusion shaft 31 is fitted with a margin, and this extrusion shaft is integrated with the piston 32 which can move back and forth at its rear end. In addition, a holding plate 12B is fixed to the tip of the extrusion shaft 31 with a bolt, and the inner cylindrical basket 12 is integrated with the holding plate 12B by a bolt.

Moreover, in the inner cylindrical basket 12, the distributor plate 13 which functions as a board which disperse | distributes the slurry supplied from the slurry supply pipe 2 mentioned later is provided. The distributor plate 13 is fixed to the holding plate 11B holding the outer cylindrical basket 11 through a plurality of support arms 11C which penetrate the holding plate 12B with a margin.

As shown in FIG. 1 and FIG. 2, a first cleaning liquid supply pipe 14 and a second cleaning liquid supply pipe 15 for supplying a cleaning liquid such as distilled water are embedded in the casing 1 from the front. A plurality of cleaning nozzles 14A, 14A,... Are attached to the first cleaning liquid supply pipe 14, and the outer cylindrical basket 11 and the inner cylindrical basket 12 (outer screen 11A) are disposed from above the casing 1. And an inner screen 12A]. Similarly, a plurality of cleaning nozzles 15A, 15A, ... are attached to the second cleaning liquid supply pipe 15, and the outer cylindrical basket 11 and the inner cylindrical basket 12 (outer screen (from the lower side of the casing 1) are attached. 11A) and the inner screen 12A), and the cleaning liquid is sprayed toward the cake receiving ring 16 described later.

The cleaning liquid is sprayed at the time of cake washing or in-flight washing. In the cake washing, the cleaning liquid or the like finally discharged may be discharged from the filtrate outlet 6, or may not be discharged. In-flight cleaning is performed during the continuous operation of the centrifugal separation to remove clogging of the outer screen 11A, the inner screen 12A, and the like, and to wash away the residual cake. The cleaning liquid and the residual cake are discharged from the cleaning liquid outlet 10.

The discharge chute 8 discharges the filtered cake to be transferred to the next process. As shown in Fig. 2 and Fig. 3, the upper end of the discharge chute 8 is attached with a plate-shaped member 8A having an opening at a substantially central portion, and a cake inlet is provided on the upper surface of the plate-shaped member 8A. An almost cylindrical mouth tube 8B is formed to be connected. This mouth pipe 8B is arrange | positioned so that a hollow part may overlap with the opening of 8 A of plate-shaped members. And the damper 9D of the damper apparatus 9 as a discharge switching mechanism mentioned later is slidably abutted on the upper end of the mouth pipe 8B.

In the centrifugal separator configured in this way, the slurry to be processed is supplied from the slurry supply pipe 2 toward the distributor plate 13. At this time, since the outer cylindrical basket 11 and the outer screen 11A rotate by the rotation of the main shaft 30, and the support arm 11C penetrates the holding plate 12B, the inner cylindrical basket ( 12 and the inner screen 12A are also rotated in the same direction.

In this rotation process, the extrusion shaft 31 is moved back and forth by the piston (32). At this time, when the retracted inner cylindrical basket 12 is advanced, the extruded portion 12C at its front end slides on the inner circumferential surface of the outer screen 11A, and the cake deposited on the outer screen 11A is extruded forward. And discharges from the tip portion into the cake receiving ring 16.

The inner cylindrical basket 12 with which this discharge has ended retracts to its original position in the city. While the inner cylindrical basket 12 continuously receives the slurry and performs solid-liquid separation in the inner screen 12A on its inner surface, some of the slurry moves to the outer screen 11, and also in the outer screen 11A. Solid-liquid separation takes place. The filtrate in each screen 11A, 12A is comprised so that it may discharge from the filtrate outlet 6 through the through-hole of each basket 11,12.

In the present embodiment, the present invention has been described based on a multi-stage (two-stage) type centrifugal separator having an outer cylindrical basket and an inner cylindrical basket coaxially installed therewith, but the present invention is not limited thereto, for example, The single-stage extruded centrifuge may have only a cylindrical basket.

<Configuration of Damper Apparatus According to the Present Invention>

Next, a damper device and a cake accommodating ring in which the damper device is installed will be described.

As shown in FIG. 1, the cake receiving ring 16 is located at the tip side of the outer cylindrical basket 11 to accommodate the forward movement of the cake deposited on the outer screen 16. Since the cake receiving ring 16 is structurally separated from the outer cylindrical basket 11 and fixed to the inner side of the casing 1 via the cake receiving ring bracket 16A as shown in FIG. Even if the outer cylindrical basket 11 rotates, the cake receiving ring 16 itself does not rotate. The shape of the cake accommodating ring 16 is formed in the shape of a ring-shaped cylindrical member having a roughly divided cross section, a cylindrical discharge pipe 16B is formed in a portion of the ring shape, and the outer cylindrical basket 11 is rotated. The cake, which is urged in the direction of the law by the law, moves in a ring shape in the cylindrical member of the approximately half-section of the cake accommodating ring 16 while being discharged from the discharge pipe 16B which is the cake outlet. It is. In addition, the shape of the cake accommodating ring 16 is not limited to the cylinder of the roughly divided cross section, It may be an angular cylinder of the half divided cross section.

As shown in Figs. 2 and 3, the damper device 9, which is a discharge switching mechanism, is located below the discharge pipe 16B, which is the cake outlet, and above the discharge chute 8, which is the cake inlet, and the damper is left and right. The discharge to the discharge chute 8 is controlled by moving.

The damper device 9 includes an air cylinder 9A, a rod 9C connected to the piston member 9B provided in the air cylinder 9A, and a damper 9D connected to the rod 9C. . Here, the compressed air supplied from the air supply pipe (not shown) is selectively provided through the first port 93 and the second port 94 provided at both ends of the air cylinder 9A with the piston member 9B interposed therebetween. Is filled in the air cylinder 9A. By selectively supplying compressed air to the first port 93 and the second port 94, the piston member 9B is moved left and right, and the damper 9D is moved left and right.

The damper 9D is provided with the cover part 91 which covers the mouth pipe 8B which is a cake entrance, and the opening part 92 which communicates with the mouth pipe 8B. Specifically, in the state where the compressed air is supplied into the air cylinder 9A through the first port 93, as shown in FIG. 2, the opening 92 of the damper 9D is formed of the mouth tube 8B. It is intended to be located above. In contrast, as shown in FIG. 3, the cover 91 of the damper 9D is configured to close the mouth tube 8B while compressed air is supplied into the air cylinder 9A through the second port 94. It is configured to cover.

Therefore, at the time of the centrifugal separation process, the compressed air is supplied into the air cylinder 9A through the first port 93 and the opening 92 of the damper 9D is positioned above the mouth tube 8B. It can be discharged from the discharge chute 8, and during the in-flight cleaning process, compressed air is supplied into the air cylinder 9A through the second port 94, and the mouth tube (to the cover 91 of the damper 9D) is provided. By covering 8B), outflow of the cleaning liquid and the residual cake to the discharge chute 8 can be prevented.

For this reason, only by performing control of opening and closing of a damper, since the washing | cleaning liquid and residual cake at the time of in-flight washing | cleaning process can be prevented from flowing out to the discharge chute 8, it is not necessary to provide a large discharge switching apparatus separately. In addition, since the washing liquid and the residual cake at the time of the in-flight washing process do not flow into the discharge chute 8, the load of the dryer does not increase even when directly connected to the dryer equipment, for example, in the next step. Connections can be made and additional facilities can be reduced.

On the other hand, in this embodiment, the opening part 92 is located above the mouth pipe 8B in the state which supplies compressed air into the air cylinder 9A through the 1st port 93, and supplies compressed air to the 2nd port 94. FIG. Although the lid part 91 covers the mouth pipe 8B in the state supplied to 9 A of air cylinders through (), it is not limited to this structure. That is, the opening part 92 is provided in the position (left side in FIG. 2) further from the piston member 9B, and the cover part 91 is provided in the part (right side in FIG. 2) closer to the piston member 9BC. The opening 92 is positioned above the mouth tube 8B in a state in which compressed air is supplied into the air cylinder 9A through the second port 94, and compressed air is supplied through the first port 93. The cover part 91 may take the structure which covers the mouth pipe 8B in the state supplied into 9 A of cylinders.

The cleaning liquid and the residual cake in the in-flight cleaning process in which outflow to the discharge chute 8 are prevented by the cover portion 91 of the damper 9D are plate-shaped from the upper surface of the cover portion 91 as shown in FIG. 3. It is discharged to the cleaning liquid outlet 10 through the upper surface of the member 8A.

4 and 5 show another embodiment of a damper device. The damper device 19 is different from the damper device 9 in a damper shape and the other configuration is the same. The difference between the damper 9D and the damper 19D is that the damper 19D has only a cover portion 191 which covers the mouth tube 8B, which is the cake inlet, and a portion corresponding to the opening in the damper 9D is formed. There is no point. Therefore, during the centrifugal separation process, as shown in FIG. 4, compressed air is supplied into the air cylinder 19A through the second port 194, and the cover 191 of the damper 19D is moved to the right direction. If the mouth tube 8B is left open, the cake can be discharged from the discharge chute 8, and during the in-flight cleaning process, as shown in FIG. 5, compressed air is supplied to the first port 193. If it supplies in the air cylinder 19A, and it is made to cover the mouth pipe 8B with the cover part 191 of the damper 19D, outflow of the washing | cleaning liquid and residual cake to the discharge chute 8 can be prevented.

Flow of Centrifugal Separation and In-flight Cleaning Process

Based on FIG. 6, the flow of the centrifugation process and the in-flight washing process which model this embodiment as a model is demonstrated.

In the centrifugal separation process, the damper 9D of the damper device 9 is opened (a state in which the opening 92 of the damper 9D is positioned above the mouth tube 8B to discharge the cake from the discharge chute 8). The slurry to be processed is supplied from the slurry supply pipe 2, the outer cylinder basket 11 and the outer screen 11A are rotated by the rotation of the main shaft 30, and the rotating filtrate (mother liquor) is passed through the filtrate outlet 6 Eject from). Then, the cake deposited on the outer screen 11A is extruded forward, discharged from the distal end into the cake receiving ring 16, and finally, the opening 92 of the damper 9D is positioned above the mouth tube 8B. Position and discharge the cake from the discharge chute 8.

In the next in-flight cleaning step, the slurry supply from the slurry supply pipe 2 is stopped, and then the damper 9D is closed (the mouth tube 8B is covered with the cover portion 91 of the damper 9D), and the cleaning liquid and remaining water are retained. The cake to a state which prevents outflow to the discharge chute 8]. Then, the cleaning liquid is supplied from the first cleaning liquid supply pipe 14 and the second cleaning liquid supply pipe 15, and the cleaning cylinders 14A and 15A are provided with the outer cylindrical basket 11 and the inner cylindrical basket 12 (outer screen 11A). And an inner screen 12A], spraying the cleaning liquid toward the cake accommodating ring 16 to clean the residual cake and to discharge the filtrate outlet 6 or the cleaning liquid outlet 10.

Then, the cycle of stopping the supply of the cleaning liquid from the first cleaning liquid supply pipe 14 and the second cleaning liquid supply pipe 15 and then supplying the slurry to be processed from the slurry supply pipe 2 with the damper 9D open. Repeat.

In this cycle, the opening and closing control of the damper 9D is performed by the compressed air supply from the air supply pipe (not shown), and the air supply from the air supply pipe is automatically controlled at the opening and closing of the damper 9D. In this case, the centrifugal separation process and the in-flight cleaning process can be performed in an unattended automated operation sequentially.

According to the present invention, the installation space can be compact, the solid and liquid can be selectively discharged reliably while the installation cost is reduced, and the direct connection can be made directly to a machine (such as a dryer in a drying step) that performs the next step. have.

Claims (5)

A centrifugal separator provided with a damper device that can be opened and closed on the cake inlet side of a discharge chute for discharging a cake, In the centrifugation process, the cake is discharged from the discharge chute, And a damper of the damper device covering the cake inlet side of the discharge chute at the time of the in-flight cleaning step to prevent outflow of the cleaning liquid and residual cake to the discharge chute. It has a rotating cylindrical basket and a screen fixed to its inner surface, A centrifuge configured to discharge a cake formed on the screen from a discharge chute through a cake receiving ring, A damper device that can be opened and closed is provided between the cake outlet side of the cake accommodation ring and the cake inlet side of the discharge chute, In the centrifugation process, the cake is discharged from the discharge chute, And a damper of the damper device to cover the cake inlet side of the discharge chute during the in-flight cleaning process, and to prevent outflow of the cleaning liquid and residual cake to the discharge chute. An outer cylindrical basket that rotates, an inner cylindrical basket installed coaxially with each other, a screen fixed to each inner surface thereof, and a continuous extrusion mechanism for extruding the inner cylindrical basket forward and extruding the cake formed on the outer screen. Equipped, A centrifugal separator configured to discharge the extruded cake from a discharge chute through a cake receiving ring, A damper device that can be opened and closed is provided between the cake outlet side of the cake accommodation ring and the cake inlet side of the discharge chute, In the centrifugation process, the cake is discharged from the discharge chute, And a damper of the damper device to cover the cake inlet side of the discharge chute during the in-flight cleaning process, and to prevent outflow of the cleaning liquid and residual cake to the discharge chute. The damper device according to any one of claims 1 to 3, wherein the damper device includes an air cylinder, a rod connected to a piston member provided in the air cylinder, and a damper connected to the rod, A centrifugal separator configured to control opening and closing of the damper by supplying air into the air cylinder. The centrifugal separator according to claim 4, wherein the damper has a lid portion covering the cake inlet side and an opening communicating with the cake inlet side.

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