Conical screen basket centrifuge

• US 5,378,364 A
• Filed: 09/14/1992
• Issued: 01/03/1995
• Est. Priority Date: 09/14/1992
• Status: Expired due to Fees

• Current Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Original Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Inventors: Welling, Bruce L.
• Primary Examiner(s): Dawson, Robert A.
• Assistant Examiner(s): REIFSNYDER, DAVID A
• Application Number:
  US07/944,520
• Time in Patent Office: 841 Days
• Field of Search: 210/360.1, 210/380.1, 210/380.3, 210/498, 494/36, 494/52, 494/53
• US Class Current: 210/512.1
• CPC Class Codes: B01D 2201/282 Filtering elements with a horizontal rotation or symmetry axis
• CPC Class Codes: B01D 29/445 Bar screens
• CPC Class Codes: B01D 33/11 arranged for outward flow filtration
• CPC Class Codes: B01D 33/275 using contiguous impervious surfaces
• CPC Class Codes: B01D 33/466 scrapers
• CPC Class Codes: B04B 3/04 discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
• CPC Class Codes: B04B 7/18 formed or coated with sieving or filtering elements filters in general B01D; sieves in general B07B

Abstract

A scroll centrifuge having a basket/cage combination with apertures and a screen portion. The screen portion comprising tungsten carbide ligaments arranged side-by-side and end-to-end on the inside surface of the basket/cage combination to form slots. The slots whereof communicate the interior of the basket/cage combination to the exterior.

Claims

1. A conical screen basket centrifuge having a rotary conical basket/cage combination with apertures and including a conical screen portion, a rotary, helically-bladed scroll mounted coaxially therein, means for rotating said basket/cage combination and scroll about their common axis in the same direction at a differential speed, means for feeding a solids-liquid slurry into said basket/cage combination and means defining an outlet from said basket/cage combination for solids moved through said screen section by said scroll, wherein said screen portion comprises,

slotted screen means comprising a plurality of abrasion resistant ligaments bridging the apertures of said basket/cage combination and laterally spaced to form slots, the slots whereof communicate the interior of said screen portion with the exterior of said basket/cage combination and lie substantially along paths parallel to the common axis.

2. A centrifuge according to claim 1 wherein said ligaments are tapered in a longitudinal direction.

3. A centrifuge according to claim 1 wherein the ligaments are formed of a material having an average weight loss in the range of 0.6 to 3.8 mm³ under the ASTM'"'"'G-65 wear test.

4. A centrifuge according to claim 1 wherein said ligaments are arranged to extend generally the length of the basket/cage combination.

5. A centrifuge according to claim 1 wherein said screen portion between said plurality of slots is formed of ligaments arranged in laterally spaced, endwise abutted sets to form corresponding slots.

6. A centrifuge according to claim 1 wherein the ligaments are tungsten carbide.

7. A centrifuge according to claim 1 wherein the ligaments are ceramic.

8. A centrifuge according to claim 1 wherein the slots lie along an axial path.

9. A centrifuge according to claim 1 wherein the slots lie along a circumferential path.

10. A centrifuge according to claim 1 wherein the slots lie along a path which is at an angle to the axis of rotation.

11. A centrifuge according to claim 1 wherein the apertures of the basket/cage combination are rectangular.

12. A centrifuge according to claim 1 wherein the apertures of the basket/cage combination are circular or elliptical.

13. A centrifuge according to claim 1 wherein the screen portion comprises screen elements which are inserted into the apertures of the basket/cage combination.