1-17. (canceled)
18. A pump housing comprising an outer casing comprising two side parts, each having a peripheral edge with abutment faces, the abutment faces being in contact with one another when the two side parts are secured together in an assembled position, the side parts having associated co-operating locating elements at the peripheral edges which, when the two parts are in the assembled position, limit relative lateral movement therebetween, wherein the co-operating locating elements include a projection on one of the side parts and a recess on the other of the side parts, an edge of the projection being located against an edge of the recess when in the assembled position.
19. The pump housing according to claim 18 wherein each side part includes co-operating mounting apertures therein for receiving bolts for securing the two side parts together in the assembled position, the projection and recess being disposed in the region of one of the mounting apertures.
20. The pump housing according to claim 19 wherein there is a plurality of the co-operating mounting apertures in the side parts which are arranged in spaced-apart relation about the peripheral edges of the two parts, there being co-operating projections and recesses in the region of each co-operating mounting aperture of said plurality of the co-operating mounting apertures.
21. The pump housing according to claim 20 including a peripheral flange at the peripheral edge portion having a plurality of bosses thereon, each having a mounting aperture therein.
22. A pump liner for a pump housing, the pump housing comprising an outer casing, the pump liner being receivable within the outer casing in use, the pump liner comprising opposed side wall portions and a peripheral wall portion therebetween with a pumping chamber therein, a discharge outlet extending from the pumping chamber, each side wall portion having an opening therein, at least one of the openings having a peripheral flange extending therearound and projecting outwardly from the side wall portion, said flange having an inner side and an outer side, the inner side having a cylindrical inner surface that allows for relative axial and rotational movement between the liner and another pump component located therein, and further including a peripheral groove in the cylindrical inner surface of the flange.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A centrifugal separator for separating non-cohesive particulate contaminants from a liquid supplied thereto comprising a housing enclosure, an axis extending through the housing enclosure in an operationally substantially vertical orientation, a rotor arranged to receive a liquid at elevated pressure and, in reaction to ejection of the liquid therefrom substantially tangentially, spin about the axis at least a predetermined minimum speed to effect separation of said non-cohesive contaminant particles from contaminated liquid therein, the rotor comprising a container having
(i) an outer, peripheral wall including a peripheral side wall displaced from the axis,
(ii) an internal partition wall extending radially inwardly from the peripheral wall dividing the container into a separation chamber and an outflow chamber and defining at its radially inner periphery a transfer aperture between the separation and outflow chambers, said separation chamber including an inlet aperture to admit contaminated liquid thereto from the rotation axis and the outflow chamber having at least one nozzle to eject liquid from the container, and
(iii) barrier wall means, within the separation chamber, comprising a barrier wall extending upwardly from the partition wall to terminate in a barrier wall edge and disposed radially inwardly of the peripheral side wall, to define with said peripheral side wall and partition wall a contaminant retention region, said barrier wall being inclined towards the peripheral side wall such that said barrier wall edge is spaced therefrom to form a radially restricted neck to the contaminant retention region at such inclination and spacing, when the rotor is spinning about the axis at least said predetermined minimum speed, that non-cohesive contaminants deposited on the barrier wall by centrifugal separation force are caused by said force to flow from the barrier wall edge to the peripheral side wall 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 to slump into said contaminant retention region and be inhibited from being entrained into liquid flowing between the inlet aperture and the transfer aperture.
2. A centrifugal separator as claimed in claim 1 in which the barrier wall means comprises at least one additional partition wall extending radially inwardly from the peripheral side wall and an additional barrier wall extending upwardly from said at least one additional partition wall and terminating in an additional barrier wall edge and disposed radially inwardly of the peripheral side wall, to define with said peripheral side wall and additional partition wall additional contaminant retention region, 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 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 barrier 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 and be inhibited from being entrained into liquid flowing between the inlet aperture and the transfer aperture.
3. A centrifugal separator as claimed in claim 2 in which the barrier wall means further comprises a complementary barrier wall associated with said barrier wall or said additional barrier wall, and 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 and axially facing said barrier wall or said additional barrier wall whereby non-cohesive contaminants deposited on the complementary barrier 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 contaminant 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 contaminant retention region or said additional contaminant retention region and inhibited by the neck from being entrained into liquid flowing between the inlet aperture and the transfer aperture.
4. A centrifugal separator as claimed in claim 3 in which the complementary barrier wall uppermost in the separation chamber is defined by peripheral wall of the rotor container.
5. A centrifugal separator as claimed in claim 3 in which said complementary barrier wall has, when the rotor is not spinning at at least said predetermined minimum speed, a complementary barrier wall edge spaced axially from said barrier wall or said additional barrier wall edge by a gap.
6. A centrifugal separator as claimed in claim 5 in which the barrier wall means includes valve means arranged to be biased to substantially close the gap and responsive to radially outwardly directed centrifugal separation force to overcome said bias and open the gap.
7. A centrifugal separator as claimed in claim 6 in which said complementary barrier wall and said barrier wall or said additional barrier wall extends completely circumferentially of the axis and the valve means comprises a flap 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.
8. A centrifugal separator as claimed in claim 6, in which at least one of said barrier wall, said additional barrier wall or said complementary barrier wall comprises, in a circumferential direction about said axis, a plurality of discrete wall members, at least one of said discrete wall members having a wall edge normally biased into abutment with a cooperating facing wall member and radially deflectable by spinning of the rotor substantially at said predetermined speed.
9. A centrifugal separator as claimed in claim 2 in which the barrier wall means further comprises a complementary barrier wall associated with said barrier wall or said additional barrier wall, and 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 and axially facing said barrier wall or said additional barrier wall whereby non-cohesive contaminants deposited on the complementary barrier 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 contaminant 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 said contaminant retention region or said additional contaminant retention region and inhibited by the neck from being entrained into liquid flowing between the inlet aperture and the transfer aperture and at least one said complementary barrier wall extends from an additional partition wall.
10. A centrifugal separator as claimed in claim 1 in which the radially inwardly facing surface of at least one wall of the barrier wall means has baffle means arranged to encourage rotation of the liquid with the wall.
11. A centrifugal separator as claimed in claim 10 in which the baffle means comprises at least one radially extending embossement of the wall.
12. A centrifugal separator as claimed in claim 10 in which the baffle means comprises a flange secured to the surface of the wall.
13. A centrifugal separator as claimed in claim 11 in which said barrier wall means includes a plurality of discrete wall members arranged about the axis, said wall members being inclined with respect to each other in a circumferential direction to define at their junctions radially extending baffle means.
14. A centrifugal separator as claimed in claim 1 in which the barrier wall means is formed as a unitary sub-assembly, having at least a side wall, partition wall, supplementary partition wall and barrier wall extending therefrom to define integrally therewith the contaminant retention region.
15. A rotor for a centrifugal separator, comprising:
a container having:
(i) an outer, peripheral wall including a peripheral side wall displaced from a longitudinal rotation axis of the rotor,
(ii) an internal partition wall extending radially inwardly from the peripheral wall dividing the container into a separation chamber and an outflow chamber and defining at a radial inner periphery a transfer aperture between the separation and outflow chambers, the separation chamber including an inlet aperture to admit contaminated liquid thereto from the rotation axis and the outflow chamber having at least one nozzle to eject liquid from the container, and
(iii) barrier wall means, within the separation chamber, comprising a barrier wall extending upwardly from the partition wall to terminate in a barrier wall edge and disposed radially inwardly of the peripheral side wall, to define with said peripheral side wall and partition wall a contaminant retention region, said barrier wall being inclined towards the peripheral side wall such that said barrier wall edge is spaced therefrom to form a radially restricted neck to the contaminant retention region at such inclination and spacing, when the rotor is spinning about the axis at at least a predetermined minimum speed, that non-cohesive contaminants deposited on the barrier wall by centrifugal separation force are caused by said force to flow from the barrier wall edge to the peripheral side wall, and, when the rotor is not spinning at at least side predetermined speed, to permit the separated non-cohesive contaminants deposited on the peripheral side wall to slump into said contaminant retention region and be inhibited from being entrained into liquid flowing between the inlet aperture and the transfer aperture.
16. The rotor as claimed in claim 15 in which the barrier wall means comprises at least one additional partition wall extending radially inwardly from the peripheral side wall and an additional barrier wall extending upwardly from said at least one additional partition wall and terminating in an additional barrier wall edge 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, 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 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 barrier 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 and be inhibited from being entrained into liquid flowing between the inlet aperture and the transfer aperture.
17. The rotor as claimed in claim 16 in which the barrier wall means further comprises a complementary barrier wall associated with said barrier wall or said additional barrier wall, and 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 and axially facing said barrier wall or said additional barrier wall whereby non-cohesive contaminants deposited on the complementary barrier 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 contaminant 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 contaminant retention region or said additional contaminant retention region and inhibited by the neck from being entrained into liquid flowing between the inlet aperture and the transfer aperture.
18. The rotor as claimed in claim 17 in which the complementary barrier wall uppermost in the separation chamber is defined by the peripheral wall of the rotor container.
19. The rotor as claimed in claim 17 in which said complementary barrier wall has, when the rotor is not spinning at at least said predetermined minimum speed, a complementary barrier wall edge spaced axially from said barrier wall or said additional barrier wall edge by a gap.
20. The rotor as claimed in claim 19 in which the barrier wall means includes valve means arranged to be biased to substantially close the gap and responsive to radially outwardly directed centrifugal separation force to overcome said bias and open the gap.
21. The rotor as claimed in claim 20 in which said complementary barrier wall and said barrier wall or said additional barrier wall extends completely circumferentially of the axis and the valve means comprises a flap 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.
22. The rotor as claimed in claim 20, in which at least one of said barrier wall, said additional barrier wall or said complementary barrier wall comprises, in a circumferential direction about said axis, a plurality of discrete wall members, at least one of said discrete wall members having a wall edge normally biased into abutment with a cooperating facing wall member and radially deflectable by spinning of the rotor substantially at said predetermined speed.
23. The rotor as claimed in claim 16 in which the barrier wall means further comprises a complementary barrier wall associated with said barrier wall or said additional barrier wall, and 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 and axially facing said barrier wall or said additional barrier wall whereby non-cohesive contaminants deposited on the complementary barrier 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 contaminant 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 said contaminant retention region or said additional contaminant retention region and inhibited by the neck from being entrained into liquid flowing between the inlet aperture and the transfer aperture and at least one said complementary barrier wall extends from an additional partition wall.
24. The rotor as claimed in claim 15 in which the radially inwardly facing surface of at least one wall of the barrier wall means has baffle means arranged to encourage rotation of the liquid with the wall.
25. The rotor as claimed in claim 24 in which the baffle means comprises at least one radially extending embossment of the wall.
26. The rotor as claimed in claim 24 in which the baffle means comprises a flange secured to the surface of the wall.
27. The rotor as claimed in claim 25 in which said barrier wall means includes a plurality of discrete wall members arranged about the axis, said wall members being inclined with respect to each other in a circumferential direction to define at their junctions radially extending baffle means.
28. The rotor as claimed in claim 15 in which the barrier wall means is formed as a unitary sub-assembly, having at least a side wall, a partition wall, a supplementary partition wall and a barrier wall extending therefrom to define integrally therewith the contaminant retention region.
29. A rotor for a centrifugal separator, comprising:
a container having:
(i) an outer, peripheral wall including a peripheral side wall displaced from a longitudinal rotation axis of the rotor,
(ii) an internal partition wall extending radially inwardly from the peripheral wall dividing the container into a separation chamber and an outflow chamber and defining at a radial inner periphery a transfer aperture between the separation and outflow chambers, the separation chamber including an inlet aperture and the outflow chamber having at least one ejection nozzle, and
(iii) a barrier wall assembly, within the separation chamber, comprising a barrier wall extending upwardly from the partition wall to terminate in a barrier wall edge and disposed radially inwardly of the peripheral side wall, to define with said peripheral side wall and partition wall a contaminant retention region, said barrier wall being inclined towards the peripheral side wall such that said barrier wall edge is spaced therefrom to form a radially restricted neck to the contaminant retention region.
30. The rotor as claimed in claim 29 in which the barrier wall assembly comprises at least one additional partition wall extending radially inwardly from the peripheral side wall and an additional barrier wall extending upwardly from said at least one additional partition wall and terminating in an additional barrier wall edge 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, the 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 to the additional contaminant retention region.
31. The rotor as claimed in claim 30 in which the barrier wall assembly further comprises a complementary barrier wall associated with said barrier wall or said additional barrier wall and comprising a downwardly extending wall that is inclined towards the peripheral side wall and axially facing said barrier wall or said additional barrier wall.
32. The rotor as claimed in claim 31 in which the complementary barrier wall uppermost in the separation chamber is defined by the peripheral wall of the rotor container.
33. The rotor as claimed in claim 31 in which said complementary barrier wall has a complementary barrier wall edge spaced axially from said barrier wall or said additional barrier wall edge by a gap.
34. The rotor as claimed in claim 33 in which the barrier wall assembly includes a valve arranged to be biased to substantially close the gap and responsive to radially outwardly directed centrifugal separation force to overcome said bias and open the gap.
35. The rotor as claimed in claim 34 in which said complementary barrier wall and said barrier wall or said additional barrier wall extends completely circumferentially of the axis and the valve comprises a flap 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.
36. The rotor as claimed in claim 34, in which at least one of said barrier wall, said additional barrier wall or said complementary barrier wall comprises, in a circumferential direction about said axis, a plurality of discrete wall members, at least one of said discrete wall members having a wall edge normally biased into abutment with a cooperating facing wall member and radially deflectable by spinning of the rotor substantially at said predetermined speed.
37. The rotor as claimed in claim 30 in which the barrier wall assembly further comprises a complementary barrier wall associated with said barrier wall or said additional barrier wall and comprising a downwardly extending wall that is inclined towards the peripheral side wall and axially facing said barrier wall or said additional barrier wall and the complementary barrier wall extends from an additional partition wall.
38. The rotor as claimed in claim 29 in which the radially inwardly facing surface of at least one wall of the barrier wall assembly has a baffle.
39. The rotor as claimed in claim 38 in which the baffle comprises at least one radially extending embossment of the wall.
40. The rotor as claimed in claim 38 in which the baffle comprises a flange secured to the surface of the wall.
41. The rotor as claimed in claim 39 in which said barrier wall assembly includes a plurality of discrete wall members arranged about the axis, said wall members being inclined with respect to each other in a circumferential direction to define at their junctions a radially extending baffle.
42. The rotor as claimed in claim 29 in which the barrier wall assembly is formed as a unitary sub-assembly, having at least a side wall, a partition wall, a supplementary partition wall and a barrier wall extending therefrom to define integrally therewith the contaminant retention region.