Liquid pump, in particular, detergent liquid pump for household appliances, and method for assembling it

• US 6,474,959 B2
• Filed: 03/02/2001
• Issued: 11/05/2002
• Est. Priority Date: 09/02/1998
• Status: Expired due to Fees

• Current Assignee: BSH Bosch und Siemens Hausgerã¤Te GmbH (Robert Bosch GmbH)
• Original Assignee: BSH Bosch und Siemens Hausgerã¤Te GmbH (Robert Bosch GmbH)
• Inventors: Eisert, Horst
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US09/802,526
• Publication Number:
  US 20010024613A1
• Time in Patent Office: 613 Days
• Field of Search: 417/360, 417/423.15, 417/424.1, 417/423.14, 417/423.7
• US Class Current: 417/360
• CPC Class Codes: F04D 13/0633 Details of the bearings
• CPC Class Codes: H02K 21/145 having an annular armature coil with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

A liquid pump includes a rotor, a rotor shaft, and a split cage for accommodating the rotor. A stator assembly is situated outside the split cage, and a pump casing has a pump-casing bottom and top part, a flange part, and a plug-in holder. The pump casing accomodates a pump impeller on the shaft, and the pump-casing top part has a plug-in holder. A method for assembling the liquid pump includes axially pressing a bearing into a bearing holder. O-rings are mounted on the split cage. The rotor is axially inserted into the split cage, which is axially pressed into the plug-in holder of the pump casing. The rotor shaft is simultaneously pressed into the pump impeller. The bearing holder has another supporting part and is axially pressed into the split cage. A cap together with the stator assembly are axially mounted onto the plug-in holder. The pump-casing bottom part is connected to the pump-casing top part, preferably with a pump-casing seal in between.

Claims

1. A liquid pump, comprising:

a permanently excited rotor;

a split cage having an outside and an axial end and defining an interior accommodating said permanently excited rotor;

a stator radially situated on said outside of said split cage;

a pump impeller;

a rotor shaft having a shaft end; and

,

a pump casing defining a casing interior accommodating said pump impeller on said shaft end;

said pump casing connected to said axial end of said split cage;

said pump casing and said split cage retained together through an axial plug fit; and

said pump casing and said stator retained together through an axial plug-fit.

2. The liquid pump according to claim 1, wherein said stator is a wound stator assembly.

3. The liquid pump according to claim 1, including a cap defining a cap interior accommodating said stator, said stator and said pump casing retained together through an indirect plug-fit.

4. The liquid pump according to claim 3, wherein said split cage and one of said cap and said stator are connected by a sliding fit free of significant radial supporting loads.

5. The liquid pump according to claim 3, wherein said split cage and one of said cap and said stator are connected by a guiding and sliding fit free of significant radial supporting loads.

6. The liquid pump according to claim 1, wherein said split cage is pot-shaped and has a base, and said shaft end is a drive end projecting through said base into said pump casing and receiving said pump impeller.

7. The liquid pump according to claim 1, wherein said pump impeller has a holder and said rotor shaft is inserted axially into said holder.

8. The liquid pump according to claim 1, wherein said rotor shaft has a non-drive shaft end, said split cage has a non-drive cage end, and including a bearing holder holding said non-drive shaft end, said bearing holder being retained on said non-drive cage end in an axial plug-fit.

9. The liquid pump according to claim 6, wherein said rotor shaft has a non-drive shaft end, said split cage has a non-drive cage end, and including a bearing holder holding said non-drive shaft end, said bearing holder being retained on said non-drive cage end in an axial plug-fit.

10. The liquid pump according to claim 8, including a cap defining a cap interior accommodating said stator, and wherein:

said split cage is configured to be assembled in an axial-plug fit with said pump casing from said non-drive shaft end;

at least one of said stator and said cap is configured to receive said stator in an axial-plug fit with said pump casing;

said rotor shaft is configured to be assembled in an axial-plug fit with said pump impeller supported from said shaft end; and

said non-drive end bearing holder is configured to be assembled in an axial-plug fit with said split cage.

11. The liquid pump according to claim 9, including a cap defining a cap interior accommodating said stator, and wherein:

said split cage is configured to be assembled in an axial-plug fit with said pump casing from said non-drive shaft end;

at least one of said stator and said cap is configured to receive said stator in an axial-plug fit with said pump casing;

said rotor shaft is configured to be assembled in an axial-plug fit with said pump impeller supported from said shaft end; and

said non-drive end bearing holder is configured to be assembled in an axial-plug fit with said split cage.

12. The liquid pump according to claim 1, including a cap defining a cap interior accommodating said stator, said cap being configured to match user-specific requirements.

13. The liquid pump according to claim 1, including a cap defining a cap interior accommodating said stator, said cap being configured to match user-specific connection and installation specifications.

14. The liquid pump according to claim 1, including a cap defining a cap interior accommodating said stator, said split cage having plug-in holders, said stator having plug-in holders, said cap having plug-in holders, and said pump casing having:

a motor side;

a radial flange disposed at said motor side;

an integrally formed axially projecting plug-in sleeve and plug-in holders mating corresponding ones of said plug-in holders of said split cage, said plug-in holders of said stator, and said plug-in holders of said cap.

15. The liquid pump according to claim 1, including:

a bearing holder holding said non-drive shaft end, said bearing holder being retained on said non-drive cage end in an axial plug-fit; and

at least one flexible intermediate supporting part in a region of a mutual plug-fit retention between said split cage and said pump casing and between said bearing holder and said split cage.

16. The liquid pump according to claim 15, wherein said at least one flexible intermediate supporting part is at least one flexible, elastomeric, intermediate supporting part.

17. The liquid pump according to claim 16, wherein said at least one flexible, elastomeric, intermediate supporting part is at least one O-ring.

18. The liquid pump according to claim 15, wherein said at least one flexible intermediate supporting part is form-lockingly fixed relative to a respective pair of said split cage, said pump casing, and said bearing holder.

19. The liquid pump according to claim 18, wherein said form lock is at least one of a mutual snap connection and a latching connection.

20. The liquid pump according to claim 15, wherein said at least one flexible intermediate supporting part is integrated with at least one of said split cage and said pump casing.

21. The liquid pump according to claim 1, wherein said pump casing has motor side and is divided axially into a pump-casing top part and a pump-casing bottom part, said pump-casing top part is disposed on said motor side;

and said pump-casing bottom part faces away from said motor side and is connected to said pump-casing top part.

22. The liquid pump according to claim 21, wherein said pump-casing top part has an integral pressure branch.

23. The liquid pump according to claim 21, wherein said pump-casing bottom part has an integral intake branch.

24. The liquid pump according to claim 21, wherein said pump-casing bottom part is to be configured to match user specific requirements.

25. A detergent liquid pump for household appliances to be driven by a single-phase synchronous motor having a permanently magnetic rotor, comprising:

a split cage having an outside and an axial end and defining an interior accommodating said permanently magnetic rotor;

a stator radially situated on said outside of said split cage;

a pump impeller;

a rotor shaft having a shaft end; and

a pump casing defining a casing interior accommodating said pump impeller on said shaft end;

said pump casing connected to said axial end of said split cage;

said pump casing and said split cage retained together through an axial plug fit; and

said pump casing and said stator retained together through an axial plug-fit.