Unitized seal impeller thrust system

• US 6,062,815 A
• Filed: 06/05/1998
• Issued: 05/16/2000
• Est. Priority Date: 06/05/1998
• Status: Expired due to Term

• Current Assignee: Freudenberg-Nok General Partnership (Freudenberg & Company KG)
• Original Assignee: Freudenberg-Nok General Partnership (Freudenberg & Company KG)
• Inventors: Holt, Robert S., Dahlheimer, John C.
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): Barton, Rhonda
• Application Number:
  US09/092,714
• Time in Patent Office: 711 Days
• Field of Search: 415/111, 415/113, 415/170.1, 415/174.3, 415/230, 415/231, 277/367, 277/361
• US Class Current: 415/231
• CPC Class Codes: F04D 29/0413 hydrostatic; hydrodynamic thrust bearings
• CPC Class Codes: F04D 29/126 especially adapted for liquid pumps
• CPC Class Codes: F05B 2240/52 Axial thrust bearings
• CPC Class Codes: F16J 15/348 Pre-assembled seals, e.g. cartridge seals
• CPC Class Codes: F16J 15/36 connected by a diaphragm or bellow to the other member

Abstract

A unitized seal impeller thrust system includes an impeller unit which includes a tubular neck portion that has flat surfaces on opposite sides of one another. The impeller unit includes a plurality of radially extending blades and a circular trough surrounding the neck portion. The system further includes a seal head assembly which is secured within the trough, and a seal seat assembly which engages the seal head assembly. The system further includes a thrust washer which engages the seal seat assembly and the retainer ring which is secured to the tubular neck portion at an end of the neck portion. The retainer ring also engages the thrust washer in a ball and socket type arrangement. The system provides a unitized seal, impeller, thrust system that is capable of preload testing and/or leak testing before assembly of the pump unit.

Claims

1. An unitized seal, impeller and thrust system, said system including:

an impeller unit, said unit includes a tubular neck portion, said unit includes a plurality of radially extending blades, said unit having a circular trough surrounding said neck portion;

a seal head assembly secured within said trough;

a seal seat assembly engaging said seal head assembly;

a thrust washer engaging said seal seat assembly; and

a retainer ring which is secured to said neck portion at an end of said neck portion, said retainer ring engages said thrust washer, said retainer ring axially locates said thrust washer, said seal seat assembly, said seal head assembly and said impeller with respect to one another.

2. The unitized system of claim 1 wherein said retainer ring includes a protruding torus which interacts with a corner on a rear surface of said thrust washer.

3. The unitized system of claim 2 wherein said torus and said corner accommodates angular movement.

4. The unitized system of claim 2 wherein said torus and said comer create a ball and socket type joint.

5. The unitized system of claim 1 wherein said retainer ring includes a protruding torus which interacts with a recess on an outer surface of said thrust washer.

6. The unitized system of claim 1 further including a gimbal ring located between said retainer ring and said thrust washer.

7. The unitized system of claim 6 wherein said gimbal ring contacts two 90°

offset pair of gimbal pads.

8. The unitized system of claim 1 wherein said seal head assembly includes a boot member having bellows, an insert member molded within said boot, a spring seat secured to said boot, a seal washer engaged with said boot, and a spring extended between said insert and said spring seat.

9. The unitized system of claim 1 wherein said seal seat assembly includes a ring-like grommet, said grommet having a generally L-shaped cross section, a seal seat secured within said grommet, said seal seat in constant contact with said seal washer.

10. The unitized system of claim 1 wherein said neck portion having at least one flat surface.

11. The unitized system of claim 10 wherein said at least one flat surface engages said seal head assembly.

12. The unitized system of claim 1 wherein said thrust washer absorbs an axial preload thrust of said seal head assembly.

13. The unitized system of claim 1 wherein said thrust washer and said retainer ring are sealed off from a liquid being pumped through a pump.

14. A pump assembly using a unitized seal, impeller, and thrust system, said assembly including:

a pump housing;

a pump cover secured to said pump housing;

a unitized seal, impeller, thrust system secured within said pump housing, said impeller unit having a tubular neck portion, said tubular neck portion having a first and second flat surface, said first and second flat surfaces are opposite each other, said unitization of said seal, impeller and thrust system allows for preload testing or leak testing before assembly of said pump; and

a motor, said motor having a drive shaft with a first and second flat surface, said motor shaft slidingly engages with said flat surfaces of said impeller unit.

15. The pump assembly of claim 14 wherein said impeller unit includes an impeller integral with an impeller insert, said impeller insert having said tubular neck portion.

16. The pump assembly of claim 14 wherein said unitized system includes a seal head assembly and a seal seat assembly.

17. The pump assembly of claim 16 wherein said seal head assembly is located in a circular trough of said impeller unit.

18. The pump assembly of claim 16 wherein said unitized system includes a thrust washer engaging said seal seat assembly and a retainer ring secured to a top end of said tubular neck portion, said retainer ring engaging said thrust washer.

19. The pump assembly of claim 18 wherein said retainer ring and said thrust washer axially locate said seal seat assembly, said seal head assembly and said impeller unit with respect to one another.

20. The pump assembly of claim 19 wherein location of said seal and of said impeller unit with respect to said pump housing is independent of an axial distance between said pump housing and said pump cover.

21. The pump assembly of claim 18 wherein said thrust washer includes an angular beveled corner on a rear surface and said retainer ring includes a protruding torus.

22. The pump assembly of claim 21 wherein said torus and said corner accommodate angular movement.

23. The pump assembly of claim 21 wherein said thrust washer and said retainer ring are sealed off from a fluid being pumped by said pump.

24. The pump assembly of claim 18 wherein said retainer ring and said neck portion align and secure said seal, impeller and thrust system as a unitized system.

25. The pump assembly of claim 14 wherein said impeller unit includes an impeller and an impeller insert which is secured to said impeller.

26. A pump assembly using a unitized seal, impeller, and thrust system, said assembly including:

a pump housing;

a pump cover secured to said pump housing;

a unitized seal, impeller, thrust system secured within said pump housing, said impeller unit having a tubular neck portion, said tubular neck portion having a first and second flat surface, said first and second flat surfaces are opposite each other, said unitized system having a thrust washer with an angular corner on a rear surface and a retainer ring having a protruding torus, said unitized seal, impeller and thrust system having mating surfaces protected from contamination and damage prior to and during installation into said pump housing; and

an electric motor, said motor having a drive shaft with a first and second flat surface, said motor shaft slidingly engages with said flat surfaces of said impeller unit.

27. A unitized water pump seal comprising:

an impeller unit having a tubular neck portion, said neck portion having at least one flat surface;

a seal head assembly attached to said impeller unit;

a seal seat assembly mating with said seal head assembly;

a retainer ring secured in said recess to assemble said seal head assembly and said seal seat assembly on said neck portion and facilitate leak testing of said unitized impeller, seal head assembly, and seal seat assembly prior to final assembly in an application, said retainer ring having a torus portion; and

a thrust washer engaging said seal head assembly, said thrust washer having a conforming corner to interact with said torus portion on said retainer.

28. A seal as claimed in claim 27 wherein said corner is beveled to form a ball and socket joint with said torus.

29. A seal as claimed in claim 27 further comprising:

a motor attached to said neck portion, said motor having a shaft with a flat portion that engages said at least one flat surface of said neck portion.

30. A seal claimed in claim 29 wherein said recess has at least one flat surface to engage said retainer ring.