Electric fluid pump having a cooled wet section
First Claim
Patent Images
1. An electric fluid pump comprising:
- a pump shaft having a longitudinal axis;
an electric pump drive having a wet section configured to drive the pump shaft;
a rotor arranged on the pump shaft having a plurality of cavities that are arranged with a circumferential spacing allowing an axial flow through the rotor that during rotary operation of the rotor, produces an at least partially axially directed fluid flow in the wet section of the electric pump drive; and
a stator surrounding the rotor across an annular gap,wherein openings for the plurality of cavities are formed on each axial rotor end,wherein an opening on one axial rotor end configured as a fluid output is situated radially further out than an opening on an opposite axial rotor end configured as a fluid input,wherein each of the plurality of cavities are substantially triangular in radial cross section and are separated from one another by spoke-shaped webs,wherein each of the plurality of cavities is delimited by an outer rotor wall, an inner wall proximate to the pump shaft, respective spoke-shaped webs, and the respective rotor ends,wherein a radial cavity dimension measured between the outer rotor wall and the inner wall proximate to the pump shaft is substantially constant along an axial length and greater than a diameter of the openings for the plurality of cavities on each axial rotor end.
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Accused Products
Abstract
An electric fluid pump having a rotor. The rotor of the pump is provided with elements that produce an at least partially axially directed fluid flow in the wet section of the pump during rotation of the rotor. This fluid flow serves to cool components of the pump that are arranged in or on the wet section.
9 Citations
7 Claims
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1. An electric fluid pump comprising:
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a pump shaft having a longitudinal axis; an electric pump drive having a wet section configured to drive the pump shaft; a rotor arranged on the pump shaft having a plurality of cavities that are arranged with a circumferential spacing allowing an axial flow through the rotor that during rotary operation of the rotor, produces an at least partially axially directed fluid flow in the wet section of the electric pump drive; and a stator surrounding the rotor across an annular gap, wherein openings for the plurality of cavities are formed on each axial rotor end, wherein an opening on one axial rotor end configured as a fluid output is situated radially further out than an opening on an opposite axial rotor end configured as a fluid input, wherein each of the plurality of cavities are substantially triangular in radial cross section and are separated from one another by spoke-shaped webs, wherein each of the plurality of cavities is delimited by an outer rotor wall, an inner wall proximate to the pump shaft, respective spoke-shaped webs, and the respective rotor ends, wherein a radial cavity dimension measured between the outer rotor wall and the inner wall proximate to the pump shaft is substantially constant along an axial length and greater than a diameter of the openings for the plurality of cavities on each axial rotor end. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification