Centrifugal Pump

• US 20080219839A1
• Filed: 07/05/2006
• Published: 09/11/2008
• Est. Priority Date: 08/22/2005
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Heier, Christoph, Hils, Alois, Mueller, Axel, Pfetzer, Johannes, Schoenemann, Anja
• Application Number:
  US11/997,958
• Publication Number:
  US 20080219839A1
• Time in Patent Office: Days
• US Class Current: 415/204
• CPC Class Codes: F04D 13/0626 Details of the can
• CPC Class Codes: F04D 13/0633 Details of the bearings
• CPC Class Codes: F04D 13/064 Details of the magnetic circuit
• CPC Class Codes: F04D 13/0686 Mechanical details of the pump control unit pump control F04D15/00
• CPC Class Codes: F04D 29/426 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/628 especially adapted for liquid pumps

Abstract

The invention relates to a centrifugal pump (10) for liquids, comprising a pump spiral housing (12) and a pump wheel (28), which is driven by an integrated electromotor (14, 20, 34, 36), whereby the rotational axis thereof (29) is arranged in a coaxial in relation to the rotational axis (37) of the pump wheel (28). The pump spiral housing (12) is sealed by a sealing ring (72) and is connected to the motor housing by means of a bayonet catch (74, 78) and covers the front side thereof. According to the invention, the motor housing (14) is pot-shaped and is made of plastic and the base thereof (13) which is oriented towards the pump spiral housing (12) forms a common housing wall in relation to the pump spiral housing (12).

Claims

1. A centrifugal pump (10) for liquids having a pump spiral housing (12) and a pump impeller (28), which is driven by an integral electric motor (14, 20, 34, 36), the axis of rotation (29) of which is arranged coaxially with the axis of rotation (37) of the pump impeller (28), the pump spiral housing (12) being sealed by a sealing ring (72) and connected to the motor casing (14) means of a bayonet catch (74, 78), covering the end face of the motor casing, characterized in that the motor casing (14) is of canister-shaped design and is made from plastics, its base (13) facing the pump spiral housing (12), forming a common housing wall with the pump spiral housing (12).

2. The centrifugal pump (10) as claimed in claim 1, characterized in that the base (13) has a protuberance, facing the open end of the motor casing (14) and concentric with the axis of rotation (29), with an approximately cylindrical dividing wall (19) and an internal base (17), which in its central area has a thickening (18), in which a bearing axis (22) pointing towards the pump spiral housing (12) is injection molded, on which a rotor (36) of the electric motor is rotatably supported.

3. The centrifugal pump (10) as claimed in claim 2, characterized in that the rotor (36) and the pump impeller (28) are integrally formed and are supported by way of an injected-molded bearing (30) on the bearing axis (22).

4. The centrifugal pump (10) as claimed in claim 3, characterized in that the bearing axis (22), at its free end, carries a mushroom-type stop (24), which axially secures the bearing (30) in that the mushroom-type stop (24) engages by means of a twist lock in a recess (32) in the longitudinal axis (22).

5. The centrifugal pump (10) as claimed in claim 1, characterized in that a coil shell (40) of a stator (34) of the electric motor is inserted in an annular space between the dividing wall (19) and the outer wall (15) of the motor casing (14) and seals the annular space with one end wall (41).

6. The centrifugal pump (10) as claimed in claim 5, characterized in that the coil shell (40), in the area of the annular space, is wound from the end wall (41) to the base (13) of the motor casing (14) with varnished copper wire (52), the wire ends of which are laid to support points (42, 44, 46) for insulation displacement connectors (48).

7. The centrifugal pump (10) as claimed in claim 6, characterized in that a stator ring (38) is pressed over the coil formed from the varnished copper wire (52) onto the coil shell (40) as far as the end wall (41).

8. The centrifugal pump (10) as claimed in claim 5, characterized in that the end wall (41) has projections (56) on its circumference, which by turning the coil shell (40) relative to the motor casing (14) during the assembly process engage behind inwardly projecting undercuts (62) on the motor casing (14) in the manner of a bayonet catch.

9. The centrifugal pump (10) as claimed in claim 6, characterized in that at least one coding (64) is provided in the area of the undercuts (62).

10. The centrifugal pump (10) as claimed in claim 5, characterized in that the support points (42, 44, 46) with insulation displacement connections (48) are arranged on the end wall (41) on the side facing the opening in the motor casing (14), a printed circuit board (94), the tracks of which are bonded by press-in contacts (86) of the insulation displacement connections (48), resting on the support points (42, 44, 46).

11. The centrifugal pump (10) as claimed in claim 5, characterized in that a Hall sensor (98), the pins (54) of which are electrically bonded to the insulation displacement connections (48) by pressing the insulation displacement connections (48) into the associated support point (44), is inserted into a pocket (60) in the end wall (41) of the motor housing (14) on the side facing the rotor (36).

12. The centrifugal pump (10) as claimed in claim 5, characterized in that a hooked catch (58), which engages in a recess (66) on the motor casing (14) and circumferentially fixes the coil shell (40) in relation to the motor casing (14), is provided on the circumference of the end wall (41).

13. The centrifugal pump (10) as claimed in claim 10, characterized in that the hooked catch (58) adjoins a projection (56) of the coil shell (40).

14. The centrifugal pump (10) as claimed in claim 1, characterized in that the coil shell (40) supports the dividing wall (19) and/or the internal base (17) of the motor housing (14).

15. The centrifugal pump (10) as claimed in claim 1, characterized in that the opening in the motor housing (14) is sealed by an electronics cover (20), which has axially oriented connector pins (88), which project through an injection molded seal (26) into the motor casing (14) and engage in a power connection (100) of the coil shell (40).

16. The centrifugal pump (10) as claimed in claim 15, characterized in that axially oriented, inward-pointing pins (90), which engage in pre-centering sleeves (50) provided on the coil shell (40) for pre-centering in relation to the coil shell (40), are molded onto the electronics cover (20).

17. The centrifugal pump (10) as claimed in claim 15, characterized in that the electronics cover (20), on its circumference, has radially pliable hooked catches (92), which engage in recesses (16) in the motor housing (14).

18. The centrifugal pump (10) as claimed in claim 15, characterized in that the electronics cover (20), offset axially inwards in relation to the hooked catches (92), has a radially acting sealing ring (96), which bears tightly against the inside of the outer wall (15) of the motor casing (14).

19. The centrifugal pump (10) as claimed in claim 12, characterized in that the inside of the outer wall (15) diverges conically in relation to the opening in the motor casing (14).