Centrifugal pump

• US 4,586,872 A
• Filed: 12/07/1983
• Issued: 05/06/1986
• Est. Priority Date: 12/24/1982
• Status: Expired due to Fees

• Current Assignee: Klockner-Humboldt-Deutz AG
• Original Assignee: Klockner-Humboldt-Deutz AG
• Inventors: Noack, Horst-Guenter, Corzilius, Rolf, Stollbrink, Johann
• Primary Examiner(s): Garrett, Robert E.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/558,838
• Time in Patent Office: 881 Days
• Field of Search: 415/219 C, 415/219 R, 415/219 A, 415/170 A, 415/196, 415/197, 415/DIG. 3
• US Class Current: 415/214.1
• CPC Class Codes: F04D 29/426 especially adapted for liquid pumps

Abstract

In a centrifugal pump, particularly for conveying tailing water in dressing plants for minerals such as coal, as for flue gas desulfuration systems or the like, a spiral housing is clamped between two retainer plates which externally connect to parallel wear walls without being bolted thereto. The retainer plates are designed as a two-piece, externally screw-connected enclosure for a hydraulics portion of the pump. The spiral housing is connected with the external screw-connection over retaining lugs. The enclosure parts are designed as flat retainer plates having a smooth clamping face for the spiral housing and the wear walls, and exhibit feet that have been welded on.

Claims

1. A centrifugal pump, comprising:

a rotor mounted on a rotor shaft;

roller bearing means for supporting said shaft;

a bearing flange housing surrounding the shaft and containing the rolling bearings therein supporting the shaft;

a spiral housing for the rotor which, together with parallel wear walls radially abutting the spiral housing, enclose the rotor;

a two-piece enclosure for the spiral housing and wear walls comprising inlet side and back-side retaining plates;

means for pulling the retaining plates toward one another so as to create a clamping action to retain the parallel wear walls and spiral housing in bolt-free connecting abutment with one another;

said back-side retaining plate having an inside aperture, and a shaft protection sleeve surrounding the shaft and positioned in said aperture;

said bearing flange housing having an end flange and an aperture in said end flange; and

said shaft protection sleeve having means for aligning said back-side retaining plate with said bearing flange by an abutting cooperation with an inside edge wall of the apertures of the end flange and back-side retaining plate.

2. A centrifugal pump according to claim 1 wherein the bearing flange housing is formed of two shell parts welded together.

3. A centrifugal pump according to claim 2 wherein the bearing flange housing end flange directly connects with abutting flush surfaces to the back-side retaining plate by screws.

4. A centrifugal pump according to claim 3 wherein the end flange inside aperture has substantially a same diameter as the inside aperture in the back-side retainer plate.

5. A centrifugal pump according to claim 4 wherein said shaft protection sleeve has a shared radial flange dimensioned to be received within and abut against said inside aperture of the bearing flange housing end flange and the inside aperture of the back-side retaining plate.

6. A centrifugal pump according to claim 1 wherein the inside wear wall has a suction inlet all formed as a single casting.

7. A centrifugal pump according to claim 1 wherein both retaining plates are designed as flat plates having a smooth clamping face for the spiral housing and for the wear walls.

8. A centrifugal pump according to claim 1 wherein the wear wall at the back side has an integrally projecting ring that engages in abutting contact into said inside aperture of the back-side retainer plate.

9. A centrifugal pump according to claim 1 wherein the spiral housing is held between the retainer plates at smooth clamping faces.

10. A centrifugal pump according to claim 1 wherein the spiral housing has retaining lugs extending radially outwardly.

11. A centrifugal pump according to claim 1 wherein each of the wear walls has a radially outward circular indentation or depression into which corresponding rings of the spiral housing engage.

12. A centrifugal pump according to claim 11 wherein an O-ring seal is provided at the circular indentation of the wear walls.

13. A centrifugal pump according to claim 1 wherein the wear walls in the spiral housing have bearing shoulders for abutment against inside surfaces of the retaining plates.

14. A centrifugal pump according to claim 1 wherein the rotor has long back vanes.

15. A centrifugal pump according to claim 1 wherein the retainer plates are screwed to one another by bolts exteriorly of the spiral housing so as to clamp the spiral housing therebetween.

16. A centrifugal pump according to claim 1 wherein a clutch protection sleeve is provided at an end of the bearing flange housing opposite the end flange.

17. A centrifugal pump for conveying fluids, comprising:

a rotor mounted on a shaft;

a bearing flange housing containing the shaft and having bearings therein supporting the shaft;

said bearing flange housing having an end flange;

inlet side and back-side wear walls between which the rotor is positioned;

a spiral housing surrounding and in abutting screw-free connection contact with an outer periphery of the wear walls;

inlet side and back-side retainer plates pulled together by screw means for clamping the spiral housing and wear walls therebetween such that the spiral housing is in abutting screw-free connection with the wear walls;

said end flange being bolted to said back-side retainer plate; and

first support foot means projecting downwardly from the inlet side retainer plate and second support foot means projecting downwardly from said back-side retainer plate for independently supporting the inlet side retainer plate during removal of the back side retainer plate and vice-versa.

18. The pump of claim 17 wherein the spiral housing has projecting retaining lug means permitting removal of the inlet side or back-side retainer plate while permitting the spiral housing to remain attached to the respective retainer plate which is not removed.

19. The pump of claim 17 wherein the end flange is directly bolted flush to the back-side retainer plate.

20. A pump according to claim 17 wherein the bearing flange housing at an end opposite the end flange has auxiliary foot means which in conjunction with the second support foot means holds in position and aligns the back-side retainer plate relative to the inlet side retainer plate.

21. A pump according to claim 17 wherein the back-side wear wall has a ring engageable and supportable in an inside aperture of the back-side retainer plate.

22. The pump according to claim 17 wherein the bearing flange housing has a plurality of reinforcing angles connecting to the end flange and running perpendicularly therefrom in connection with the flange housing.

23. A centrifugal pump, comprising:

a rotor mounted on a rotor shaft;

roller bearing means for supporting said shaft;

a bearing flange housing surrounding the shaft and containing the roller bearing means therein supporting the shaft;

a spiral housing with retaining lug means and parallel wear walls radially abutting the spiral housing surrounding the rotor;

a two-piece enclosure for the spiral housing and wear walls comprising inlet side and back-side retainer plates;

bolt means passing through the retainer lug means for pulling the retainer plates toward one another so as to create a clamping action to retain the parallel wear walls and spiral housing in bolt-free connecting abutment with one another;

the inlet side retainer plate and back-side retainer plate each having their own foot supporting means for independently supporting either retainer plate given removal of the other plate; and

said retaining lug means holding the spiral housing to either retainer plate given removal of the other retainer plate.

24. A pump according to claim 23 wherein the bearing flange housing has an end flange in direct and flush contact with the back-side retainer plate and wherein the bearing flange housing has an additional foot means at an end opposite of the end flange for supporting the end flange housing and back-side retainer plate given removal of the inlet side retaining plate.