JPS6028553B2 - centrifuge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal separator that supplies a stock solution into a rotating basket and separates it into solids and liquids.

BACKGROUND ART Centrifuges used for manufacturing pharmaceutical products, etc. are closed-type centrifuges to avoid contamination with impurities, bacteria, and the like. In a closed-type centrifuge, all operations from supplying the stock solution to discharging the solids must be performed from outside the casing that covers the basket, and the solids collected in the basket cannot be removed manually or by hand. It is necessary to send it to the next processing step without exposing it to outside air. As a conventional centrifugal separator of this type, one in which a suction pipe is provided at the tip of a scraping blade of a solid matter collecting device is known. In this conventional centrifugal separator, the basket is rotated at a low speed, and a scraping blade is inserted into the solid matter layer to scrape off the solid matter, while at the same time suctioning it through a pipe and discharging it from the basket. The solids are removed by lowering the scraping blade from the top of the basket to the bottom. However, with this conventional centrifuge, some of the scraped solids that cannot be sucked up by the pipe accumulates at the bottom of the basket, so when the scraping process progresses to a certain point, the solids that have accumulated at the bottom are scraped. The scraping blade could not be lowered any further due to the collision, and the solid matter discharge operation could not be smoothly carried out to the end. In addition, a centrifugal separator has been proposed that has separate scraping blades for scraping solid matter inside the basket and a discharge pipe for discharging the scraped solid matter to the outside of the basket, but in this case, the bottom of the basket is flat. Therefore, the solid matter cannot be sufficiently discharged by the discharge pipe, and the scraped solid matter obstructs the descending of the cutting blade. An object of the present invention is to provide a closed-type centrifugal separator that allows solid matter to be discharged smoothly to the end.

The present invention provides a centrifugal separator equipped with a scraping device for scraping solid matter formed in a basket, which includes providing an annular recess at the bottom of the basket to accommodate the solid matter scraped off by the scraping device; The solids housed in the recess are discharged to the outside of the basket through a solids discharge pipe.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below along with embodiments thereof with reference to the drawings.

The drawing schematically shows an embodiment of the invention, and in the drawing 1 is a casing supported by a support device 2 provided with a shock absorber.

The casing 1 is formed into a cylindrical shape with a bottom, and its upper open end is closed by a removable lid plate 3. A bearing 4 is disposed at the center of the bottom of the casing 1, and this bearing supports a rotating shaft 5 that extends vertically within the casing. The lower end of the rotating shaft 5 is connected to a rotational drive device 6, such as a hydraulic motor, supported on the lower surface of the casing. Reference numeral 7 denotes a basket housed in the casing 1, and this basket includes a cylindrical peripheral wall 8, an annular end wall 9 projecting inward in the direction of the wall from the upper end of the peripheral wall 8, a bottom wall 10, and a central portion of the bottom wall 10. It consists of a boss part 1 1 provided in the boss part 1 1 .
is iron-bonded and supported by the rotating shaft 11.

A boss 11 is located near the center of the bottom wall 10 of the basket 7.
An annular recess 12 is formed so as to surround the same D. The recess 12 consists of a flat bottom 13 and a diagonal wall 14 that rises obliquely upward from the green outer circumference of the bottom. There is.
A large number of through holes 16 are formed in the peripheral wall 8, and the liquid separated by rotation of the basket is diffused through the through holes to remove liquid. An annular liquid guide member 17 having an L-shaped cross section is welded to the lower inner surface of the peripheral wall of the casing 1, and a liquid drain port 18 is provided at the lower end of the peripheral wall of the casing 1. The bottom surface of the liquid guide member 17 is inclined so that the bottom is at the bottom at the position of the liquid drain row 8, so that the liquid discharged from the basket 7 is guided to the drain port 18 by the liquid guide member 17. It has become. Lid plate 3 of casing 1
A liquid supply pipe 20 is inserted into the basket 7 through the liquid supply pipe, and the stock solution to be treated is supplied into the basket through a jet hole 20a provided in the liquid supply pipe as shown by arrow a.

A drive shaft 22 of the scraping device is provided rotatably and slidably through the cover plate 3, and a scraping blade 21 is attached to the lower end of the drive shaft 22 inserted into the basket 7. . The drive shaft 22 is connected to a drive device (not shown), and this drive device rotates the scraping blade 21 so as to enter the peripheral wall 8 side of the basket 7, and lowers the scraping blade to the bottom side of the basket. It is designed to make you perform actions. A solid discharge pipe 23 is inserted into the basket through the lid plate 3.

As shown in FIG. 3, the lower end of this solid matter discharge pipe is formed into a fan shape and inserted into the recess 12, and the entrance part 2 at the lower end is inserted into the recess 12.
4 is opposed to the bottom surface of the recess 12 with a predetermined gap therebetween. Note that this solid matter discharge pipe 23 can be retracted above the recess 12. In the centrifugal separator of the above embodiment, the basket 7 is rotated at high speed, and the liquid supply pipe 20 is
When the stock solution is supplied into the basket 7 through the filter, the liquid is removed through the filter (not shown) and the through hole 16 provided on the inner periphery of the basket 7, and a layer of solid matter 25 is formed on the inner periphery of the basket 7. It is formed.

The liquid dissipated through the through hole 16 of the basket is guided to the pseudo liquid port 18 by the liquid guide member 17 and discharged to the outside.
Since the stock solution entering the recess 12 at the bottom of the basket is carried toward the peripheral wall 8 of the basket along the oblique wall part 14 by centrifugal force, no liquid remains in the recess 12. After a predetermined amount of solid material layer is formed in the basket 7, the basket 7 is decelerated and the scraping blade 21 is advanced into the solid material layer 25 while the basket 7 is rotated far from the bottom.

As a result, the solid matter is scraped off and falls into the recess 12. The solid matter discharge pipe 23 is connected to a suction pump (not shown), and the solid matter (cake) in the recess 12 is removed from the opening 2 at the lower end.
4 and discharge it to the outside of the basket. The scraping blade 21 continues to scrape off solid matter while gradually descending, but since the solid matter falls into the recess 12, the scraping off solid matter does not prevent the scraping blade from descending. As described above,
A recess is provided at the bottom of the basket to accommodate the solids scraped by the scraping device, and the solids accommodated in the recess are sucked and discharged by the solids discharge pipe.
Since the lowering of the scraping device is not obstructed, the scraping operation of the solid matter can proceed smoothly, and the solid matter in the basket can be almost completely discharged. After the solids are discharged from the basket, a cleaning liquid is supplied into the basket to clean the inside of the basket. In this case, the solids washed away by the cleaning liquid flow into the recess 12 together with the cleaning liquid and are discharged to the outside through the discharge pipe 23. be done.

In the embodiment described above, the solid matter discharge pipe 23 starts discharging the solid matter at the same time as scraping of the solid matter is started, but the solid matter discharge pipe 23 is initially retracted above the recess 12. After a certain amount of solid matter has accumulated in the recess 12, the solid discharge pipe 23 may be lowered into the recess 12 to discharge the solid matter.

In the above embodiment, the bottom of the recess 12 is provided with a flat surface, but the recess 12 may have an annular shape that does not prevent the liquid inside from being pushed up toward the peripheral wall 8 by rotation of the basket. As shown in FIG. 2, it can also be formed to have only an inclined wall 14' without a flat bottom.

In this case, the entrance portion 24 at the lower end of the solid matter discharge pipe 23 is inclined so as to face the inclined wall 14'. Note that the solid matter discharge pipe 23 may be of any type as long as it can suck the solid matter in the recess 12, and the shape of its lower end is arbitrary. In the above embodiment, the rotating shaft of the basket is supported at the bottom of the casing, and the rotating drive device 6 is disposed below the basket. The present invention can be similarly applied to a type of centrifugal separator in which a basket is supported and rotated at the upper part thereof.

In the above embodiment, a centrifugal separator that removes liquid through the through holes in the peripheral wall of the basket was used as an example. A sedimentator is also included in the centrifugal separator of the present invention. As described above, according to the present invention, an annular recess for accommodating the solids scraped by the scraping device is provided at the bottom of the basket, and the solids accommodated in the recess are passed through the solids discharge pipe. I decided to discharge it to the outside, so
There is an advantage that the scraping blade does not prevent the scraping blade from descending due to the scraped solid matter, and the solid matter discharge operation can proceed smoothly.

Furthermore, in the present invention, since the solids collected in the recess at the bottom of the basket are discharged through the solids discharge pipe, the solids can be discharged more completely, and the amount of solids remaining in the basket is extremely reduced. be able to.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a diamond part of another embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing the shape of the tip of the solid matter discharge pipe used in the illustrated embodiment. DESCRIPTION OF SYMBOLS 1... Casing, 7... Basket, 12... Annular recess, 23... Solid discharge pipe. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A centrifugal separator equipped with a basket and a scraping device for scraping solid matter formed in the basket,
A ring-shaped recess for accommodating the solids scraped by the scraping device is provided at the bottom of the basket, and a solids discharge pipe is provided for discharging the solids accommodated in the recess to the outside of the basket. A centrifugal separator.