US2856072A

US2856072A - Centrifugal separators

Info

Publication number: US2856072A
Application number: US505867A
Authority: US
Inventors: Kronstad Haavard
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-05-04
Filing date: 1955-05-04
Publication date: 1958-10-14
Anticipated expiration: 1975-10-14

Description

Oct. 14, 1958 H. KRONSTAD 2,856,072

CENTRIFUGAL SEPARATORS Filed May 4, 1955 INVENTOR 7 l v HAAVARD KRO'NSTAD ATTORNEY Unite This invention relates to centrifugal separators and more particularly to a separator for separating course and fine materials from a slurry in a continuous and expeditious manner.

It is an object of the invention to provide a casing having a'discharge opening at its lower end through which a slurry is caused to pass under the influence of centrifugal force, the casing having one end of a siphon tube disposed axially therein above the discharge opening adapted to draw-off the fine material from the slurry and convey the fine material from the casing.

A further object of the invention resides in feeding the slurry to the casing through a rotatable pipe, discharging the slurry by centrifugal force against the walls of the casing and siphoning the fines from the slurry through a rotatable siphon tube disposed axially of the feed pipe.

Another object of the invention resides in providing a separator which is simple and durable in construction, reliable and efiicient in operation and inexpensive to manufacture.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a fragmentary sectional view of the separator,

Fig. 2 is a section taken on line 22 of Fig. 1, and,

Fig. 3 is a fragmentary side elevation of the impeller.

Referring to the drawing wherein for the purpose of illustration a preferred embodiment of the invention is shown the numeral 5 denotes a stationary casing in the form of a truncated cone supported in an upright position by a suitable bracket 6 attached to a support 7. At the lower discharge end of the casing is a flow control valve 8 that controls the flow of material from the casing to a discharge pipe 9. A closure plate 10 covers the upper end of the casing having a central opening 11 to receive the lower end of a rotatable feed pipe 12 supported, at spaced apart intervals, by suitable rotary bearings 13. A drive pulley 14 mounted on the pipe is driven by a belt connected with a suitable power means to rotate the pipe. The upper end of pipe 12 receives the lower end of a stationary T-shape pipe fitting 15 supported by a bracket 15', the lateral port 16 of the fitting being connected to the feed line for delivering the slurry to the separator. The short end 17 of a siphon tube 18 extends axially of the pipe 12 and fitting 15 with its lower end disposed within the upper end of the casing 5. The end 17 is rotatably supported by a rotary bearing 18 in the upper end of the fitting 15, and at its upper end is connected by a rotary bearing 19 to an elbow fitting 20 that connects the short end to the horizontal portion 21 of the tube. The long end 22 of the siphon tube is connected by an elbow fitting 23 to the opposite end of the horizontal portion 21 and extends downwardly below the lower end of the short end 17 to convey the fine material drawn from the casing 5 by the siphon. Attached to the lower ends of feed pipe j ates Patent 2,856,072 Patented Oct. 14,1958

12 and tube 17 is an impeller 24 having an upper plate 25 threadedly mounted, as at 26, on the lower end of pipe 12 and a lower plate 27 threadedly mounted, as at 28, on tube 17 above its lower end. The diameter of plate 25 is larger than the diameter of plate 27 and formed integral with plate 25 are a series of spaced radial vanes 28' which are slightly inclined to the vertical axis of the impeller with their outer ends extending beyond the periphery of the lower plate and their inner ends projecting over the end of pipe 12. The vanes 28' are connected to the lower plate 27 by Welding or other suitable means so that upon rotation of pipe 12, the pipe, impeller and tube are rotated as a unit in the same direction.

In operation, the slurry enters the lateral port 16 of fitting 15 and travels down the pipe 12 to the impeller 24. Rotation of the impeller causes the material entering the impeller to be thrown by centrifugal force from the impeller against the walls of the casing and owing to the inclination of the impeller vanes the material is caused to move downwardly along the walls of the easing. When starting the machine control valve 8 is closed until the pressure in tube 18 forces the fine material from the slurry to flow through the siphon tube whereupon the control valve 8 is opened to allow the slurry with the course material to flow into the discharge pipe 9. As long as there is a continuous flow of the slurry through the separator the fine material of the slurry will be drawn off by the siphon tube thus separating the fines from the coarse material. Rotation of the impeller and short end of the siphon tube continuously agitates the slurry in the casing to insure a constant flow of material through the casing and siphon tube.

It is to be understood that the form of invention herein shown and described is a preferred example of the same and changes in the shape, size and arrangement of the parts may be made without departing from the spirit of the invention or scope of the subjoined claims.

Having thus described my invention, I claim:

1. A centrifugal separator comprising a stationary casing having tapered walls and a discharge opening at its lower end, a rotatable feed pipe having its discharge end disposed in the upper end of said casing, a siphon tube having its short end disposed axially of said feed pipe and extending below the discharge end of the feed pipe and an impeller attached to the discharge end of said feed pipe.

2. A centrifugal separator comprising a stationary casing having tapered walls and a discharge opening at its lower end, a rotatable feed pipe having its discharge end disposed in the upper end of said casing, a siphon tube having its short end rotatably mounted axially of said feed pipe and extending into said casing, and an impeller mounted on the lower end of said pipe and said tube.

3. A centrifugal separator comprising a stationary casing having tapered walls and discharge opening at its lower end, a feed pipe having its lower end disposed in the upper end of said casing, 21 siphon tube having its short end rotatably mounted axially of said pipe and extending below the lower end of said pipe and a rotatable impeller in the upper end of said casing above the terminal end of the short end of said siphon tube.

4. A centrifugal separator comprising a stationary casing having tapered walls and discharge opening at its lower end, a feed pipe having its lower end disposed in the upper end of said casing, a siphon tube having its short end extending axially of said pipe and extending below the lower end of said fluid pipe and a rotatable impeller mounted in the upper end of said casing at the lower end of said feed pipe having radial vanes inclined at an angle to the axis of said impeller.

5. A centrifugal separator comprising a stationary casing having tapered walls and discharge opening at its lower end, a rotatable feed pipe having its lower end disposed in the upper end of said casing, a siphon tube having its short end rotatably mounted axially of said feed pipe and extending into said casing, and an impeller having an upper plate attached to the lower end of said feed pipe and a lower plate attached to the short end of said siphon tube with a series of angularly disposed vanes between the upper and lower plates and projecting beyond the outer periphery of the lower plate.

6. A centrifugal separator comprising a stationary casing having tapered walls and discharge opening at its lower end, a rotatable vertical feed pipe having its discharge end disposed in the upper end of said casin, a siphon tube having its short end rotatably mounted axially of said feed pipe in spaced relation to the walls thereof with its lower end extending below the discharge end of the feed pipe, an impeller at the discharge end of said feed pipe rotatable about the axis of said pipe adapted to receive the material discharged from said pipe and means for rotating said feed pipe and siphon tube.

7. A centrifugal separator comprising a stationary inverted cone-shaped casing having a discharge opening at its smaller end, a rotatable vertical feed pipe having its discharge end disposed in the larger end of said casing, an impeller rotatable about the axis of said feed pipe and connected to the discharge end to receive the material discharged from the feed pipe, a siphon tube having its short end rotatably mounted axially of said feed pipe in spaced relation to the walls of said pipe with its lower end extending through said impeller, and means for rotating said pipe, impeller and tube.

8. A centrifugal separator comprising an inverted cone-shaped casing having a discharge opening at its smaller end, a rotatable vertical feed pipe having its discharge end disposed in the larger end of said casing, an impeller having an upper plate provided with a central opening to receive the discharge end of said feed pipe and a lower plate spaced from the upper plate by a series of radially extending vanes, a siphon tube having its short end rotatably mounted axially of said feed pipe in spaced relation to the walls of said pipe with its lower end extending through the lower plate of said impeller, and means for rotating said pipe, impeller and tube.

9. A centrifugal separator as described in claim 8 wherein the lower plate of said impeller is of less diameter than the upper plate.

References Cited in the file of this patent UNITED STATES PATENTS 978,238 Trent Dec. 13, 1910 2,375,826 Scott May 15, 1945 2,648,433 Wright Apr. 11, 1953 2,642,991 Davis June 23, 1953 2,701,642 Goodwin Feb. 8, 1955 2,724,503 Fontein Nov. 22, 1955 2,783,887 Chisholm Mar. 5, 1957 FOREIGN PATENTS 854,033 Germany Oct. 30, 1952,