JP2510288Y2 - Filter reversing centrifuge - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter inversion type centrifugal separator for separating a stock solution into a liquid content and a solid material.

[0002]

2. Description of the Related Art Centrifugal separators, which are widely used, are equipped with a scraping blade for scraping solids in a drum, and after separating liquid components, scraping blades for solids on the inner circumference of the drum. It is scraped off and discharged to the outside of the drum.

However, in such a centrifugal separator using a scraping blade, there is a problem that when the solid crystals are weak, the crystals are crushed by the scraping blade. Further, since the scraping blade cannot be advanced to a position in contact with the inner circumference of the drum, it is inevitable that a solid layer having a certain thickness remains on the inner circumference of the drum after the scraping process is completed. There is a problem that the solid matter remaining on the inner circumference is wasted.

Therefore, as shown in FIGS. 3 and 4, a filter reversal type centrifugal separator having an outer drum 1 and an inner drum 2 has been proposed. The outer drum is composed of a cylindrical body having a bottom portion 1a, and the peripheral wall portion 1b thereof is provided with a large number of through holes 1c. A hollow rotary shaft 3 is attached to the bottom of the outer drum 1, and a thrust shaft 4 guided inside the rotary shaft 3 so as to be displaced only in the axial direction.
Is provided.

The inner drum 2 is fixed to the tip of the thrust shaft 4 and is separated from the first position (the position shown in FIG. 3) close to the inner surface of the bottom of the outer drum 1 and further outward from the open end of the outer drum 1. And a bottom plate 5 that is displaced along the axial direction between the second position (the position shown in FIG. 4) and one end connected to the outer peripheral portion of the bottom plate and the other end The flexible filter 6 connected to the inner peripheral portion near the opening of the outer drum 1 and the opening of the outer drum 1 when the bottom plate 5 is in the first position by being connected to the bottom plate 5 via the connecting rod 7. It is composed of a lid plate 8 that liquid-tightly closes the part.

The cover plate 8 is provided with a through hole 8a,
The liquid supply pipe 9 is inserted through the through hole. The liquid supply pipe is connected to a stock solution supply source (not shown) through a valve 10.

Although not shown, a rotary drive device for rotationally driving the rotary shaft 3 is provided, and the rotary shaft 3 and the thrust shaft 4 are rotationally driven by the drive device, whereby the outer drum 1 and the inner drum 2 are driven. Is driven to rotate. Further, a thrust shaft driving device for driving the thrust shaft in the axial direction is provided, and the thrust shaft 4 is driven by the driving device.
Is driven in the axial direction, the bottom plate 5 of the inner drum 2 can be reciprocated between the first position shown in FIG. 3 and the second position shown in FIG.

When performing the solid-liquid separation process for separating the undiluted solution into the solid matter and the liquid content by the above centrifuge, with the bottom plate 5 in the first position as shown in FIG. The rotating shaft 3 is driven to rotate the outer drum 1 and the inner drum 2. When the stock solution is supplied to the inner side of the inner drum 2 through the liquid supply pipe 9 in this state, the liquid content is discharged through the filter 6 and the through hole 1c of the peripheral wall of the outer drum 1, and the solid material layer S is formed on the inner circumference of the filter 6. It is formed. When the solid layer S having a predetermined thickness is formed, the drums 1 and 2 are decelerated and the thrust shaft 4 is driven to move the bottom plate 5 to the second position side shown in FIG. At this time, the filter 6 is inverted and the tip of the liquid supply pipe 9 is housed in the hole 4a provided at the end of the thrust shaft 4. The solid matter is separated from the filter by reversing the filter 6, and is shaken off by the centrifugal force generated by the rotation of the drums 1 and 2 and discharged.

In the above described filter reversal type centrifugal separator,
If the stock solution is not supplied to the inner drum 2 at an appropriate speed, the stock solution is excessively supplied and the stock solution leaks from the hole 8a of the cover plate 8. Therefore, various measures were required to control the supply of the stock solution, and the handling was troublesome.

Therefore, it has been proposed that the fitting portion between the liquid supply pipe 9 and the hole 8a of the cover plate 8 has a seal structure. According to this structure, since the liquid does not leak from the hole 8a, it becomes unnecessary to perform strict liquid supply control, and the handling becomes easy. In addition, since the inner drum is sealed when performing the solid-liquid separation process, the pressure inside the drum is increased by supplying high-pressure gas into the inner drum to promote the permeation of the liquid component through the solid layer. Therefore, it is possible to obtain a solid material having a lower liquid content than before. Further, after the solid-liquid separation processing is completed, by supplying steam into the inner drum, it becomes possible to perform cleaning and sterilization of solid matter,
After that, the solid matter can be dried by supplying hot gas into the inner drum.

[0011]

As described above, the cover plate 8 is used.
If the fitting portion between the hole 8a and the liquid supply pipe 9 has a seal structure,
Although various advantages that cannot be expected with the conventional centrifuge can be obtained, the fitting portion between the hole 8a and the liquid supply pipe 9 has the liquid supply pipe 9
Since it is necessary to allow a relative rotational displacement and a linear displacement between the cover plate 8 and the cover plate 8, the sealing mechanism becomes very complicated and the cost is inevitably increased.

Further, in the conventional filter reversing type centrifugal separator, as shown in FIG. 4, since the liquid supply pipe 9 exists between the lid plate 8 and the bottom plate 5 in a state where the filter is inverted, the liquid supply pipe 9 is present. There was a problem that would interfere with the discharge of solids.

An object of the present invention is to provide a filter reversing centrifuge capable of sealing the inside of the inner drum during solid-liquid separation processing without providing a complicated sealing mechanism on the cover plate of the inner drum. Especially.

Another object of the present invention is to provide a filter reversing centrifuge capable of discharging solid matter without being disturbed by the liquid supply pipe.

[0015]

SUMMARY OF THE INVENTION The present invention is directed to an outer drum having a bottom portion attached to one end of a hollow rotating shaft and an inner drum attached to one end of a thrust shaft slidably supported inside the rotating shaft. And an inner drum is axially displaced between a first position proximate the bottom inner surface of the outer drum and a second position further outward from the open end of the outer drum. A bottom plate, a flexible filter provided so as to surround the bottom plate and having one end connected to the bottom plate and the other end connected near the opening of the outer drum; and the outer drum when the bottom plate is in the first position. The present invention relates to a filter reversal type centrifuge configured by a lid plate that closes the opening of the.

In the present invention, the inside of the thrust shaft is penetrated in the axial direction, a hole having one end opened is provided in the inner drum, and the thrust shaft itself also serves as the liquid supply pipe.

[0017]

When the hole for supplying the undiluted solution is provided by penetrating the inside of the thrust shaft as described above, there is no need to provide the hole for inserting the liquid supply pipe in the cover plate of the inner drum, and therefore the opening of the outer drum The part can be completely closed.

With the above construction, when the solid matter is discharged, there is no liquid supply pipe between the lid plate and the bottom plate of the inner drum, so that the solid matter can be easily discharged.

Further, since the inner drum can be sealed during the solid-liquid separation process, the process can be proceeded without worrying about liquid leakage due to excessive supply of the stock solution, and the handling can be facilitated.

Furthermore, when the pressure gas is fed through the hole inside the thrust shaft after the end of the supply of the undiluted liquid, when the supernatant liquid is exhausted, the gas passes through the solid layer and the pressure in the thrust shaft is rapidly increased. Since the pressure decreases, it is possible to detect the end of the solid-liquid separation process by detecting this pressure change. Therefore, it is possible to easily automate a series of operations.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an embodiment of the present invention. In these drawings, 11 is a pedestal placed on an installation base B, and 12 is a case supported on the pedestal 11. The inside of the case 12 is separated by the partition wall 13 so that the solid matter discharge chamber 14
And a liquid discharge chamber 15. Solids discharge chamber 1
A solid matter discharge port 16 is provided in the lower part of 4, and a drainage pipe 17 is connected to the lower part of the liquid content discharge chamber 15.

A boss portion 18 is provided at one end of the case 12, a hollow rotary shaft 20 is supported in the boss portion via a bearing 19, and a thrust shaft 21 is provided in the rotary shaft 20.
Are slidably supported. The thrust shaft 21 is guided so as to be displaceable only in the axial direction with respect to the rotary shaft 20, and penetrates the inside thereof in the axial direction so that the stock solution supply hole 22 is provided.
Are formed. The thrust shaft 21 is also a slide bearing 24 provided on a bearing block 23 fixed to the mount 11.
It is rotatably and slidably supported by.

One end of the rotary shaft 20 is fixed to the center of the bottom portion of the outer drum 25 arranged in the liquid discharge chamber 15, and one end of the thrust shaft 21 is fixed to the center of the circular bottom plate 26. The bottom plate 26 moves along with the displacement of the thrust shaft 21.
A first position close to the inner surface of the bottom of the outer drum 25 (see FIG.
2) and a second position (the position shown in FIG. 2) which is further outward from the open end of the outer drum, along the axial direction of the outer drum. To the outer peripheral portion of the bottom plate 26, one end of a flexible filter 27 formed in a tubular shape so as to surround the bottom plate is connected. The filter 27 is made of a flexible material such as cloth, and the other end of the filter is connected near the opening of the outer drum 25. Bottom plate 2
6, a lid plate 29 is connected to the bottom plate 2 via a connecting rod 28.
The cover plate 29 comes into contact with the open end of the outer drum when 6 is in the first position shown in FIG. Lid plate 2
A packing is provided on the outer peripheral portion of the outer drum 9 or at the open end of the outer drum so that when the cover plate 29 abuts the open end of the outer drum 25, the open portion of the outer drum is airtightly and liquidtightly closed. It has become. Bottom plate 26, filter 27, connecting rod 2
The inner drum 30 is constituted by 8 and the cover plate 29.

As shown in FIG. 1, when the bottom plate 26 is in the first position and the cover plate 29 closes the open end of the outer drum, the filter 27 extends along the inner peripheral surface of the peripheral wall portion of the outer drum 25. In this state, the liquid component that has passed through the filter 27 is discharged to the outside through a large number of transmission holes 25a provided in the peripheral wall of the outer drum 25.

Further, as shown in FIG. 2, when the bottom plate 26 is displaced to the second position, the filter 27 is turned over and pushed out into the solid matter discharge chamber 14.

A pulley 30 is attached to the rotary shaft 20,
The belt 33 is provided between the pulley 32 and the pulley 30 fixed to the output shaft of the inverter motor 31 fixed to the gantry 11.
Have been passed over. Therefore, when the electric motor 31 is rotated, the rotary shaft 20 and the thrust shaft 21 are rotated, which causes the outer drum 25 and the inner drum 30 to rotate.

The pedestal 11 is provided with a guide groove 35 extending in the axial direction of the thrust shaft 21, and the guide groove 3
The lower end of the movable block 36 is slidably fitted inside the movable block 36, and thereby the movable block 36 is supported so as to be displaceable in the axial direction of the thrust shaft 21. Movable block 36
One end of a guide rod 37 is fixed to the upper end of the guide rod 37, and the guide rod 37 is slidably fitted in a hole provided in the bearing block 23.

An annular groove 36a is provided in the movable block 36, and a flange portion 21a provided at the other end of the thrust shaft 21 is rotatably fitted in the groove 36a.
The movable block 36 has a tube 40 aligned with the thrust shaft 21.
Is connected to one end thereof, and the pipe 40 is slidably supported by a bearing 42 provided on a bearing block 41 fixed to the gantry 11. The pipe 40 is connected via a flexible pipe 43 to a stock solution supply source, a pressure gas supply source, a cleaning vapor supply source, etc., which are not shown. Sealing means is arranged between the inner periphery of the groove 36a and the flange portion 21a, and the stock solution supplied through the pipe 40 is used for the thrust shaft 21 and the movable block 3.
It is designed to flow into the undiluted solution supply hole 22 in the thrust shaft 21 without leaking from the connecting portion with 6.

One end of a screw rod 45 is rotatably supported by the bearing block 23 via a bearing 44. The other end of this screw rod 45 is supported by a bearing device 46 fixed to the pedestal 11, and is screwed into a screw hole provided in the movable block 36. One end of the screw rod 45 is connected to an output shaft of an electric motor 47 fixed to the pedestal 11. By rotating the screw rod 45 by the electric motor, the movable block 36 can be linearly displaced in the axial direction of the thrust shaft 21. It is like this.

Next, the operation of the above embodiment will be described. When performing the solid-liquid separation processing, the electric motor 47 is driven to move the movable block 36 together with the thrust shaft 21 and the pipe 40 to the position shown in FIG.
To the first position, and the outer plate 2 is moved by the cover plate 29.
Close the opening of 5. In this state, the inverter motor 31
Drive the rotary shaft 20 and the thrust shaft 21 to rotate,
The outer drum 25 and the inner drum 30 are rotated. Next, a stock solution is supplied into the inner drum 30 from a stock solution supply source (not shown) through the pipe 40 and the stock solution supply hole 22 in the thrust shaft 21. At this time, the open end of the outer drum 25 is the lid plate 29.
Closed by. Since the cover plate 29 is not provided with holes, there is no possibility that the undiluted solution leaks to the outside. Therefore, strict liquid supply control is unnecessary, and the stock solution can be easily supplied.

The undiluted solution supplied into the inner drum is separated into a solid matter and a liquid content by a centrifugal force, and the liquid content is discharged into the liquid content discharge chamber 15 through the filter 27 and the through hole 25a in the peripheral wall of the outer drum 25. To be done. This liquid is discharged through the drain pipe 17.

After a solid layer having a predetermined thickness is formed on the inner periphery of the filter 27 of the inner drum, the inverter motor 31
To reduce the rotational speed of the drums 25 and 30.
Next, by rotating the electric motor 47 and the screw rod 45, the movable block 36 and the thrust shaft 21 are moved leftward in FIG. 1, and the bottom plate 2 of the inner drum 30 is moved.
6 is moved to the second position shown in FIG. As a result, the filter 27 is inverted and the solid matter formed on the inner circumference of the filter is discharged into the solid matter discharge chamber 14.

The detection of the completion of the solid-liquid separation process is
The inner drum 30 is passed through the inner hole 22 of the thrust shaft 21.
This can be done by supplying pressure gas into the inside and detecting the back pressure in the thrust shaft. That is, the inner drum 30
When pressurized gas is supplied into the inside, the back pressure in the thrust shaft increases when the liquid remains, but when the liquid runs out, the gas passes through the solid layer and the through hole 25 in the peripheral wall of the outer drum.
The back pressure in the thrust shaft drops sharply because it escapes through a. Completion of discharge of the liquid component can be detected by detecting this decrease in back pressure.

Further, with the above construction, since the opening of the outer drum 25 is completely closed by the cover plate 29 during the processing of the stock solution, if necessary, prior to the discharge of solid matter, By supplying steam into the drum through the thrust shaft 21, the solid matter can be washed and sterilized. Further, the solid matter can be dried by supplying hot gas through the thrust shaft.

In the above embodiment, the thrust shaft 21 is driven in the axial direction by the linear drive mechanism using the screw rod 45, but the thrust shaft may be driven by using fluid pressure and a cylinder. Good.

[0036]

As described above, according to the present invention, a hole for supplying the undiluted solution is provided by penetrating the inside of the thrust shaft, and the thrust shaft itself is used as a liquid feeding pipe to feed the lid plate of the inner drum. Since it is not necessary to provide a hole for inserting the liquid pipe, the outer drum can be easily sealed. Therefore, during the solid-liquid separation process, the process can proceed without worrying about liquid leakage due to excessive supply of the stock solution, and the operation can be facilitated.

Further, according to the present invention, since there is no liquid supply pipe between the lid plate and the bottom plate of the inner drum when discharging the solid matter, there is an advantage that the solid matter can be easily discharged. . Further, in the present invention, since the thrust shaft itself is used as the liquid supply pipe, the structure can be simplified as compared with the case where the liquid supply pipe is separately used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of processing an undiluted solution according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a solid substance is discharged according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part showing a state of stock solution treatment of a conventional filter reversal type centrifugal separator.

FIG. 4 is a cross-sectional view of essential parts showing a state of a conventional filter reversal type centrifugal separator at the time of discharging solid matter.

[Explanation of symbols]

11 ... Stand, 12 ... Case, 20 ... Rotating shaft, 21 ... Thrust shaft, 22 ... Hole for supplying undiluted solution, 25 ... Outer drum, 2
6 ... Bottom plate, 27 ... Flexible filter, 28 ... Connecting rod, 29
... cover plate, 23 ... bearing block, 31 ... inverter electric motor, 33 ... belt, 36 ... movable block, 45 ... screw rod, 47 ... electric motor.

Claims (1)

(57) [Scope of utility model registration request] 1. An outer drum having a bottom portion attached to one end of a hollow rotating shaft, and an outer drum attached to one end of a thrust shaft slidably supported on the inner side of the rotating shaft so as to be close to the inner surface of the bottom portion of the outer drum. A bottom plate that is displaced along the axial direction of the outer drum between a first position and a second position that is further outward than the open end of the outer drum, and one end provided so as to surround the bottom plate. A flexible filter connected to the bottom plate and having the other end connected near the opening of the outer drum; and a lid plate that closes the opening of the outer drum when the bottom plate is in the first position. An inner drum having; a liquid supply pipe for supplying a stock solution into the inner drum; a rotary drive device for rotationally driving the rotary shaft; and a thrust shaft drive device for axially driving the thrust shaft, the thrust axis A filter inversion type in which the bottom plate is driven to move from the first position to the second position to invert the flexible filter to discharge the solid matter formed in the inner drum. In the centrifuge, a hole for supplying a stock solution having one end opened inside the inner drum by penetrating the inside of the thrust shaft in the axial direction is provided.
The filter inversion type centrifugal separator, wherein the thrust shaft also serves as the liquid supply pipe.