JPS6139109B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a centrifuge.

Conventionally, liquid and solid matter are filtered and separated using a centrifugal separator, and in order to scrape off the solid matter adhering to the basket, a shaft is lowered into the basket while the inner periphery of the basket is rotated at low speed. Since the scraping plate supported by the shaft is brought into contact with the basket, an eccentric load acts on the bearing portion of the basket, causing failure of the bearing portion.

In addition, since the scraping plate cannot be brought into strong contact with the peripheral wall of the basket, the amount of scraping is reduced, and the drum must be rotated for a long time to scrape off solid objects.

The object of the present invention is to eliminate the above-mentioned drawbacks by scraping off solid objects quickly without applying an eccentric load to the basket when scraping off solid objects.

This invention provides a rotating basket that rotates at high speed during filtration and rotates at low speed when scraping solid materials, and includes a circle within the basket that rotates together with the basket at the end of descent and is restrained from rotating as it ascends. In addition to assembling the plate, a scraping blade is provided on the upper surface of the circular plate at a required interval to scrape off solid matter adhering to the inner surface of the peripheral wall of the basket, and a casing is provided to cover the basket. To provide a centrifugal separator, in which guide vanes are arranged radially across the edge and rotate together with the basket to guide the solid objects on the disc out of the basket, and the solid objects are taken out from the bottom of the casing. do.

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

In the figure, reference numeral 1 denotes a casing which is placed in a stationary state, and within this casing 1 is provided a basket 2 which rotates by two-stage speed change between high speed and bottom speed.

The method of driving the basket 2 described above is as follows: In the case shown in the figure, a bearing 4 is provided at the center of the bottom wall 3 of the casing 1, a vertical drive shaft 5 is passed through the bearing 4 and supported thereon, and a basket is mounted on the upper end of the drive shaft 5. 2 bottom wall 6
A cylindrical protrusion 7 erected from the center of the drive shaft 5 is fixed, and a pulley 10 is driven by a motor 8 through a two-stage high-speed and low-speed changeover transmission 9, and a pulley at the lower end of the drive shaft 5. 11, the belt 12 is passed between the belt 11 and the belt 11, but the belt 12 may be driven by other methods.

Also, inside the basket 2, there is a screw that rotates together with the basket 2 at the end of the descent so as to overlap the bottom wall 6.
A disk 13 is also provided which is restrained from rotating when raised towards the upper edge of the basket 2.

In order to raise and lower the disc 13, as shown in the figure, a cylindrical body 14 that communicates with the inside of the casing 1 is provided at the center of the top wall of the casing 1, and a cylinder 14 is provided at the center of the disc 13 as the disc 13 rises. A cylindrical body 15 that fits into the cylindrical body 14 is provided, and the spline groove 22 is engaged with the upper part of the cylindrical body 15 to rotate together.
In addition, an elevating plate 16 that moves up and down with a predetermined stroke is incorporated, and a plate-like body 17 that can be moved up and down only within the cylinder body 14 is incorporated, and a key 18 provided between the upper and lower inner circumferences of the cylinder body 14 and the plate-like body 17 is fitted with the key groove 19 provided on the periphery of the plate-shaped body 1.
7 is stopped, the piston shaft 21 of the cylinder 20 fixed to the upper end of the cylindrical body 14 is passed through the plate-like body 17, and the tip of the piston shaft 21 is fixed to the elevating plate 16. A spring 24 is fitted onto the piston shaft 21 with both ends abutting against the collar 23 provided at the tip and the upper surface of the plate-like body 17.
When the cylindrical body 15 is pulled up together with the elevating plate 16 via the piston shaft 21 due to the contraction of the cylinder 20, the clutch pawls 25 provided on the lower surface of the plate-like body 17 and the upper surface of the elevating plate 16 engage with each other, causing the cylinder to move upward. When the rotation of the shaped body 15 is stopped and the cylindrical body 15 is lowered via the piston shaft 21 due to the expansion action of the cylinder 20, and the disc 13 is superimposed on the bottom wall 6,
The clutch pawl 25 is disengaged, and the clutch pawl 26 provided on the lower surface of the elevating plate 16 and the upper surface of the projecting body 7 are engaged, so that the disc 13 rotates together with the basket 2.

Furthermore, scraping blades 27 are provided at predetermined intervals on the circumferential edge of the disk 13 to scrape off solid matter adhering to the peripheral wall of the basket 2.

Further, the basket 2 is provided with guide wings 2 whose central portions of the upper surface opening are arranged radially, straddle the upper edge of the basket 2, and rotate together with the basket 2 to guide the fixed objects out of the basket 2. There is.

The above-mentioned guide vanes 28 are attached by fixing the inner end to a ring 30 fitted on the outside of the cylindrical body 15, and by providing a groove in the annular plate 31 fixed to the upper edge of the basket 2. The lower edge of the guide vane 28 was fitted into the annular plate 31, and the guide vane 28 was fixed to the annular plate 31 with screws.

An annular groove 32 is provided on the inner periphery of the upper edge of the casing 1, and solid objects falling from the annular plate 31 into the annular groove 32 are connected to the outer end of the guide vane 28 and fit into the groove 32. It is scraped up by the protruding piece 33 and discharged from a chute 34 communicating with the bottom of the groove-like groove 32.

Further, a liquid discharge pipe 35 is provided on the bottom wall 3 of the casing 1.

In the figure, 36 is a support for the casing 1, 37 is a liquid supply port pipe provided on the top wall of the casing 1, 38 is a connection port pipe for a ventilation hose provided on the top wall of the casing 1, and 39
is a peephole.

The centrifugal separator according to the present invention has the above configuration, and its operation will be explained next.
Due to the expansion action of the cylinder 20, the plate-like body 17, the elevating plate 16, and the cylindrical body 15 are lowered together with the piston shaft 21, and the disk 13 is stacked on the bottom wall 6.

At this time, the clutch pawls 26, 26 are engaged with each other, and the disk 13 is rotated together with the basket 2.

When the basket 2 is rotated at high speed and liquid is supplied into the basket 2 from the spout 37, the liquid and the solids are filtered and separated.

The separated liquid is discharged from the bottom of the casing 1 through the pipe 35, and the solids adhere to the peripheral wall of the basket 2.

In order to scrape off the solid matter adhering to the basket 2, the basket 2 is first rotated at a low speed.

When the elevating plate 16 is then gradually raised together with the piston shaft 21 by the contraction of the cylinder 20, the clutch pawls 26, 26 are first disengaged, and then the clutch pawls 25, 25 are engaged, and the rotation of the disc 13 is stopped. Since the disk 13 is stopped and lifted up via the cylindrical body 15 which rises together with the lifting plate 16, the scraping blade 27 of the disk 13 scrapes off the solid matter adhering to the peripheral wall of the basket 2.

The scraped solid objects fall onto the disk 13, and when the disk 13 reaches the upper edge of the basket 2, the guide blades 28 move the solid objects from above the disk 13 through the upper edge of the basket 2 and into the basket. 2 to the outside (the guide vanes 28 bent in an arc form the basket 2
solid objects are guided outside), and the annular groove 32
to fall.

The solid matter in the annular groove 32 is collected by the protruding piece 33 and discharged from the chute 34.

As described above, according to the centrifugal separator of the present invention, the disk in the basket is stopped rotating and raised, and the peripheral wall of the basket is removed by the scraping blades provided at predetermined intervals on the circumference of the disk. Since solid objects adhering to the basket are scraped off, no eccentric load is applied to the basket when scraping off solid objects.

Therefore, failure of the bearing portion of the basket, damage to the peripheral wall of the basket, defective scraping, etc., are eliminated.

Further, since a large number of scraping blades are provided, solid objects can be quickly scraped off.

Furthermore, the scraped solids on the disk can be discharged out of the basket by means of a radial array of guide vanes, which are provided to straddle the upper edge of the basket and rotate together with the basket.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the centrifugal separator according to the present invention, in which Fig. 1 is a plan view, Fig. 2 is a longitudinal sectional front view of the same as above, and Fig. 3 is an enlarged longitudinal sectional front view with the disk stopped rotating. , FIG. 4 is a partially cutaway plan view showing the guide vane, and FIG. 5 is a plan view of the disc. 1...Casing, 2...Basket, 3...
Bottom wall, 4... Bearing, 5... Drive shaft, 6... Bottom wall,
7... Projection body, 8... Motor, 9... Transmission,
10... Pulley, 11... Pulley, 12... Belt, 13... Disk, 14... Cylindrical body, 15... Cylindrical body, 16... Elevating plate, 17... Plate-shaped body, 18...
Key, 19...Keyway, 20...Cylinder, 21
...Piston shaft, 22...Spline groove, 23...
...Tsuba, 24...Spring, 25...Clutch claw, 26
...clutch pawl, 27 ... scraping blade, 28 ... guide wing, 29 ... ring, 31 ... annular plate, 32 ...
Annular groove, 33... protruding piece, 34... chute.

Claims (1)

[Claims] 1. A casing having a discharge pipe for the filtered and separated liquid on the bottom wall, a basket which is rotatably supported within the casing and is provided so as to be able to switch between high speed and low speed operation; a vertically movable disc that rotates with the basket at the end of its descent so as to overlap with the bottom of the basket, and is restrained from rotating as it rises; A scraping blade provided to scrape objects, and guide wings arranged radially across the upper edge of the basket and rotating together with the basket to guide the solid objects on the disc out of the basket. A centrifugal separator.