Centrifugal Pump Comprising a Drive

Abstract

A centrifugal pump includes a drive having a fan for generating a first air flow, a motor electronic system which is supported by a heat dissipation arrangement which has at least one opening for the inflow of a second air flow which mixes with at least a portion of the first air flow to enhance cooling of the motor electronic system.

Claims

1-8. (canceled)

9. A centrifugal pump, comprising: a drive having a motor electronics unit supported by an arrangement for discharging heat, and a fan for generating a first air stream, wherein the fan is configured to generate a first air stream, and the arrangement for discharging heat has at least one opening configured to for inflow of a second air stream.

10. The centrifugal pump as claimed in claim 9, wherein the arrangement for discharging heat includes surface-enlarging elements configured for heat exchange with the second air stream.

11. The centrifugal pump as claimed in claim 10, wherein a cover of the fan has at least one opening configured to induct air of the first air stream.

12. The centrifugal pump as claimed in claim 11, wherein the cover of the fan extends into the region of the at least one opening such that a space configured to receive at least a portion of the first air stream and a space in which mixing of the first and the second air streams are formed.

13. The centrifugal pump as claimed in claim 12, wherein the cover of the fan is a fan-proximal bearing cover, and the arrangement for discharging heat is connected directly to the fan-proximal bearing cover.

14. The centrifugal pump as claimed in claim 13, wherein the arrangement for discharging heat is integrally formed with the fan-proximal bearing cover.

15. The centrifugal pump as claimed in claim 14, wherein the surface-enlarging elements of the arrangement for discharging heat are integrally formed with the arrangement for discharging heat.

16. The centrifugal pump as claimed in claim 15, wherein the fan-proximal bearing cover includes at least one guide duct configured for passing-through of at least one connection between the motor electronics unit and a stator winding of the drive.

17. The centrifugal pump as claimed in claim 13, wherein the fan-proximal bearing cover includes at least one guide duct configured for passing-through of at least one connection between the motor electronics unit and a stator winding of the drive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 shows a schematic illustration of a centrifugal pump with a connection element and an electric drive;

[0026] FIG. 2 shows a section of an electric drive of a centrifugal pump in accordance with an embodiment of the present invention;

[0027] FIG. 3 shows the FIG. 2 electric drive in the perspective side view; and

[0028] FIG. 4 shows the FIGS. 2 and 3 bearing cover in the perspective internal view.

DETAILED DESCRIPTION

[0029] FIG. 1 shows the basic construction of a centrifugal pump which is driven by an electric drive 1 and is equipped with an impeller 2 and a casing 3. The casing 3 has an inlet 4 and an outlet 5. In this exemplary embodiment, a connection element 6 serves to transmit the driving force delivered by the electric drive 1 to the impeller 2. The fluid enters the pump chamber from the left through the inlet 4 and is fed axially to the impeller 2. The rotating impeller 2 transmits kinetic energy to the fluid which has accumulated in the tapering pressure nozzle and leaves the pump chamber at the top via the outlet 5. The connection element 6 is representative of all technically known connecting options between the drive 1 and the pump casing.

[0030] A section of an electric drive 1 of a centrifugal pump is illustrated in FIG. 2. The shaft 7 is supported and mounted by a pump-proximal bearing cover 9 and a fan-proximal bearing cover 17, as a result of which a rotational movement is simultaneously enabled for it. These bearing covers 9, 17 each comprise a bearing carrier 10, 18 into which a rolling bearing is in each case embedded in form-fitting and/or force-fitting manner. At the same time, these bearing covers 9, 17 also serve as a cover of the motor housing 11 and thus close the electric drive 1. The shaft 7 has a rotor 25. The circulating magnetic field in the stator winding 22 induces a magnetic field in the opposite direction in the rotor 25 and consequently sets it in motion. The stator winding 22 is fixed by the stator plates 24.

[0031] The motor housing 11 closes, conjointly with the pump-proximal bearing cover 9 and the fan-proximal bearing cover 17, the electric drive 1 and at the same time fixes the stator plates 24. The fan impeller 19, which is connected to the shaft 7, is situated outside the rotor/stator space on the fan-proximal bearing cover 17. The fan cover 21 surrounds the space of the fan 19 and thus prevents unprotected access to the possibly rotating fan impeller. The fan 19 draws an air stream through the center of the perforated fan cover 21 and thus generates a first air stream which, limited by the construction of the fan cover 21 and the bearing cover 17, is guided into an annular duct and flows over the motor housing 11 in order to cool it. The fan cover 21 adjoins the bearing cover 17 in a manner such that, below the arrangement for discharging heat 12, in particular the electronics housing base, a duct 29 is formed, by way of which the first air stream downstream entrains a second air stream, the latter mixing with the first air steam in a larger mixing duct 30. In turn, the cooling of the electric drive 1 and the cooling of the motor electronics unit 14 by way of the arrangement for discharging heat 12, having the cooling ribs molded thereon, is intensified in this way.

[0032] In the exemplary embodiment of the invention in FIG. 2, the fan-proximal bearing cover 17 is designed so as to be integral to the arrangement for discharging heat 12. The frequency inverter 13 is disposed and connected in a thermally dissipating manner within the arrangement 12. The arrangement 12 is closed with an electronics housing cover 16 on which an operating unit 15 for operating the motor electronics unit 14 is disposed.

[0033] FIG. 3 shows the electric drive 1 in the perspective side view. The motor housing 11 is connected to the bearing carrier 10. The fan cover 21 has openings 20 for inducting a first air stream and forms the termination of the motor housing 11 on the fan-side. The arrangement for discharging heat 12 is configured so as to be integral to the fan-proximal bearing cover 17 (not illustrated) and supports the motor electronics unit 14 which is closed with an electronics housing cover 16 on which the operating unit 15 is attached. The openings 23 for the inflow of a second air stream are disposed between the arrangement for discharging heat 12 and the fan cover 21. The surface-enlarging elements 26, which in this exemplary embodiment are shaped as cooling ribs, conjointly with the fan cover 21 and the arrangement for discharging heat 12 delimit the openings 23 in such a manner that ducts are configured from the spaces for the inflow of the second air stream.

[0034] FIG. 4 shows the arrangement for discharging heat 12, which in this exemplary embodiment of the invention is designed so as to be integral to the fan-proximal bearing cover 17, in the perspective internal view. A guide duct 28 is integrated in the transition of the arrangement for discharging heat 12 to the bearing carrier 18 which is configured as the cover of the motor housing 11. As illustrated in FIG. 4, such ducts 28 can be configured as rectangular, round and/or square ducts also being conceivable, however, and can be implemented in the form of a recess inside a casting. One or more elements for connection between the frequency inverter 13 and the stator winding 22 are passed through such a duct 28. The openings 23 for the second air stream are delimited by the arrangement for discharging heat 12, the surface-enlarging elements 26, and the fan cover 21 (not illustrated). The motor housing 11, which is not illustrated in this view and which can be fixed using the fastening element 27, forms the lower side of the delimitations, as a result of which a multiplicity of ducts for the first and the second air stream are configured, said ducts being able to efficiently dissipate the heat of the electric drive 1 as well as of the motor electronics unit 14.

[0035] The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.