JPS6139108B2 - - Google Patents

Description

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

Conventional centrifugal separators filter and separate liquid and solid matter, and in order to scrape off the solid matter adhering to the basket, the shaft is lowered into the basket and the centrifugal separator is moved around the inner periphery of the basket as it rotates 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, which may cause 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 rotary basket that can be shifted in two stages between high and low speeds, and has a scraped solid material discharge port located near the center of the bottom wall of the basket, and also has a discharge port for discharging the scraped solids on the outside of the center bearing inside the basket, which can be raised and lowered during operation. To provide a centrifugal separator which is provided with an elevating body and a scraping plate for scraping off solid matter adhering to the inner periphery of a basket at each tip of an arm extending radially from the lower end of the elevating body.

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

In the figure, reference numeral 1 denotes a casing provided in a stationary state, and within this casing 1 is provided a basket 2 that rotates with a two-stage speed change of high speed and low 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. Although the belt 12 is stretched between the belt 11 and the belt 11, it may be driven by other configurations.

In addition, an elevating body 13 is provided at the center of the basket 2 and moves up and down during operation, and at each tip of an arm 14 extending radially from the lower end of the elevating body 13,
A scraping plate 15 is provided for scraping off solid matter adhering to the inner periphery of the basket 2.

The above-mentioned elevating body 13 is formed of a cylindrical body fitted on the outside of the protruding body 7 in the case shown in the figure.
A cylinder 18 is supported by a cylindrical body 17 erected on the top wall 16 of the cylinder 18, and the piston shaft 19 of this cylinder 18 is
and the upper end disk 20 of the elevating body 13, and the elevating body 13 is moved into the cylinder body 17 by the contraction of the cylinder 18.
It is starting to raise the number of people.

At this time, as shown in the figure, the rotation of the elevating body 13 is stopped by a detent device 21 comprising a key inside the cylindrical body 17 and a notch provided on the periphery of the disc 20 into which the key fits.

Further, the bottom wall 3 of the casing 1 is provided with a liquid discharge pipe 22 and a scraped solid matter discharge pipe 23 on the outside.

Further, near the center of the bottom wall 6 of the basket 2, there is provided an opening 24 for dropping solid objects scraped off.

As shown in the figure, by bending the arm 14 in an arc shape in the rotational direction like an impeller,
The arm 14 can guide the scraped solid material to the drop port 24.

In the figure, reference numeral 25 denotes a support base of the casing 1, and 26 denotes a spout provided on the peripheral edge of the top wall 16, into which a liquid supply pipe 27 is inserted. 28 is a spout for connecting a ventilation hose, 29 is an insertion port for a cleaning supply pipe,
30 is a peephole.

The centrifugal separator according to the present invention has the above configuration, and its operation will be explained next.
First, the liquid supply pipe 27 is inserted into the mouth tube 26.

At this time, the elevating body 13 is lowered together with the piston shaft 19 by the extension of the cylinder 18, and the arm 14 approaches the bottom wall 6 of the basket 2, thereby avoiding collision between the arm 14 and the liquid supply pipe 27.

However, while rotating basket 2 at high speed,
Liquid is sprayed from the liquid supply pipe 27 onto the peripheral wall of the basket 2 to filter and separate the liquid and solid matter.

The separated liquid is discharged from the bottom of the casing 1 through the pipe 22, 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 liquid supply pipe 27 is first removed and the basket 2 is rotated at a low speed.

Thereafter, when the elevating body 13 is gradually raised together with the piston shaft 19 by the contraction action of the cylinder 18, the solid matter adhering to the peripheral wall of the basket 2 is scraped off by the scraping plate 15 of each arm 14.

The scraped solid objects in the basket 2 are removed from the bottom wall 6.
The arm 14 that has descended upward leads it to the drop port 24 and is discharged from the pipe 23.

As described above, according to the centrifugal separator according to the present invention, scraping plates are provided at the tips of a large number of arms extending radially from the elevating body, and the scraping plates are brought into contact with the inner surface of the peripheral wall of the basket. , no eccentric load is applied to the basket when scraping solid objects.

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

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

Furthermore, the solid objects scraped off at the center of the bottom wall of the basket can be collected by the arm and guided to the drop opening.

[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, and Fig. 3 is a discharge portion of the filtered and separated liquid and solids. FIG. 4 is a plan view of the arm. 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...Elevating body, 14...Arm, 15...
Scraping plate, 16... Top wall, 17... Cylindrical body, 18...
Cylinder, 19... Piston shaft, 20... Disc,
21... Anti-rotation device, 22... Discharge pipe, 2
3...Discharge pipe, 24...Drop port, 5...Support, 26...Port tube, 27...Liquid supply pipe.

Claims (1)

[Claims] 1. A casing having a discharge pipe for the filtered and separated liquid and a discharge pipe for the scraped-off solids on the bottom wall, and a basket that is rotatably supported within the casing and rotates at variable speeds between high and low speeds. , an elevating body provided in the center of the basket so as to stop rotating and move up and down; arms extending radially from the elevating body; and a tip of each arm provided to scrape off solid matter adhering to the peripheral wall of the basket. A centrifugal separator consisting of a scraping plate and a solid material drop opening provided on the bottom wall of the basket.