Processing

Please wait...

Settings

Settings

Goto Application

1. WO1998036846 - CENTRIFUGAL SEPARATOR

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1 A centrifugal separator (100, 200, 300, 400) for separating non-cohesive particulate contaminants from a liquid supplied thereto comprising a housing enclosure (11), an axis (34) extending through the housing enclosure in an operationally substantially vertical orientation, a rotor (20) arranged to receive a liquid at elevated pressure and, in reaction to ejection of the liquid therefrom substantially tangentially, spin about the axis at at least a predetermined minimum speed to effect separation of said non-cohesive contaminant particles from contaminated liquid therein, the rotor comprising a container (21) having
(i) an outer, peripheral wall (24) including a peripheral side wall (24^ from the axis,
(ii) an internal partition wall (35; 391) extending radially inwardly from the peripheral wall dividing the container into a separation chamber (36) and an outflow chamber (37) and defining at its radially inner periphery a transfer aperture (39) between the separation and outflow chambers, said separation chamber including an inlet aperture (33) to admit contaminated liquid thereto from the rotation axis and the outflow chamber having at least one nozzle (28) to eject liquid from the container, and characterised by
(iii) barrier wall means (140; 240; 340; 440; 540; 640; 740; 840; 940), within the separation chamber, comprising a bamer wall (141 ; 941) extending upwardly from the partition wall to terminate in a barrier wall edge (142) and disposed radially inwardly of the peripheral side wall, to define with said peripheral side wall and partition wall a contaminant retention region (144; 944), said barrier wall being inclined towards the peripheral side wall (24ι) such that said barrier wall edge is spaced therefrom to form a radially restricted neck (143) to the contaminant retention region at such inclination and spacing, when the rotor is spinning about the axis at at least said predetermined minimum speed, that non-cohesive contaminants deposited on the barrier wall (141 ; 941) by centrifugal separation force are caused by said force to flow from the bamer wall edge (142) to the peripheral side wall (24ι), and, when the rotor is not spinning at least said predetermined speed, to permit the separated non-cohesive contaminants deposited on the peripheral side wall (24 to slump into said contaminant retention region (144; 944) and be inhibited from being entrained into liquid flowing between the inlet and transfer aperture.

2. A centrifugal separator (400, 500, 600, 900) as claimed in claim 1 characterised in that the barrier wall (440; 540; 640; 940) means comprises, at least one additional partition wall (461 ; 462; 661 ; 961) extending radially inwardly from the peripheral side wall (241) and extending upwardly from each an additional barrier wall (463; 464; 663; 963) terminating in an additional barrier wall edge (465, 466) and disposed radially inwardly of the peripheral side wall, to define with said peripheral side wall and additional partition wall an additional contaminant retention region (469; 470; 969), said additional barrier wall being inclined towards the peripheral side wall such that said additional barrier wall edge is spaced therefrom to form a radially restricted neck (467; 468) to the additional contaminant retention region at such inclination and spacing, when the rotor is spinning about the axis at at least said predetermined minimum speed, that non-cohesive contaminants deposited on the additional bamer wall by centrifugal separation force are caused by said force to flow from the additional barrier wall edge to the peripheral side wall, and, when the rotor is not spinning at at least said predetermined speed, to permit the separated non-cohesive contaminants deposited on the peripheral side wall to slump into said additional contaminant retention region (469; 470) and be inhibited from being entrained into liquid flowing between the inlet and transfer aperture.

3. A centrifugal separator as claimed in claim 1 or claim 2 characterised in that the barrier wall means (240; 340; 440; 540; 740; 840; 940) comprises associated with at least one barrier wall or additional barrier wall (141; 463; 464; 963) a complementary barrier wall (245; 345; 471; 472; 473; 845; 742) comprising a downwardly extending wall that, when the rotor is spinning about the axis at at least said predetermined minimum speed, is inclined towards the peripheral side wall (24ι) and axially facing the associated barrier or additional barrier wall whereby non-cohesive contaminants deposited on the complementary bamer wall by centrifugal force are caused by said force to flow to the peripheral side wall adjacent the neck of the contaminant retention region or additional contaminated retention region and, when the rotor is not spinning at at least said predetermined speed the non-cohesive contaminants are permitted to slump into said a said retention region or additional retention region and inhibited by the neck from being entrained into liquid flowing between the inlet and transfer aperture.

4. A centrifugal separator (400; 500; 900) as claimed in claim 3 when dependant on claim 2 characterised in that at least one complementary barrier wall (471 , 472) extends from an additional partition wall (461 ; 462).

5. A centrifugal separator (300; 500; 600) as claimed in claim 3 characterised in that the complementary barrier wall uppermost in the separation (345; 573) chamber is defined by the peripheral wall (242) of the rotor container

6. A centrifugal separator (400; 500; 700; 900) as claimed in claim 3 or claim 4 characterised in that each complementary barrier wall (471 ; 472; 473; 242) has, when the rotor is not spinning at at least said predetermined minimum speed a complementary barrier wall edge spaced axially from the associated barrier wall or additional barrier wall edge by a gap (248; 748).

7. A centrifugal separator (700) as claimed in claim 6 characterised in that the barrier wall means (740) includes valve means (780) arranged to be biased to substantially close the gap (748) and responsive to radially outwardly directed centrifugal separation force to overcome said bias and open the gap.

8. A centrifugal separator (700) as claimed in claim 7 characterised in that at least one complementary barrier wall and facing barrier or additional barrier wall (141) extends completely circumferentially of the axis and the valve means (780) comprises a flap (781) of flexible and impermeable material carried by the complementary barrier wall edge and arranged to abut the barrier wall edge or additional barrier wall edge absent said outwardly directed centrifugal separation force.

9. A centrifugal separator (700) as claimed in claim 7, characterised in that at least one of barrier, additional barrier or complementary bamer walls (141 ; 245) comprises in a circumferential direction about the axis a plurality of discrete wall members at least one wall member having its wall edge normally biased into abutment with the facing wall and radially deflectable by spinning of the rotor substantially at said predetermined speed.

10. A centrifugal separator as claimed in any one of the preceding claims characterised in that the radially inwardly facing surface of at least one wall of the barrier means has baffle means (150) arranged to encourage rotation of the liquid with the wall.

11. A centrifugal separator as claimed in claim 10 characterised in that the baffle means comprises at least one radially extending embossment of the wall.

12. A centrifugal separator as claimed in claims 10 or claim 11 characterised in that the baffle means comprises a flange secured to the surface of the wall.

13. A centrifugal separator as claimed in claim 10, characterised in that at least one wall (141) of the barrier wall means is defined by a plurality of discrete wall members (141j; 1412...) arranged about the axis said walls being inclined with respect to each other in a circumferential direction to define at their junctions (1451t 1452, 1453 ...) radially extending baffle means.

14. A centrifugal separator (900) as claimed in any one of the preceding claims, characterised in that the barrier wall means (942) is formed as a unitary sub-assembly, having at least a side wall (921), partition wall (961), supplementary partition wall (935) and barrier wall (941) extending therefrom to define integrally therewith the contaminant retention region (944).