US 11,708,843 B2
Electric coolant pump having a coolant flow path around a stator, a rotor and a control circuit
Conrad Nickel, Troistedt (DE); Franz Pawellek, Lautertal (DE); and Jens Hoffmann, Schwarzbach (DE)
Assigned to NIDEC GPM GMBH, Auengrund OT Merbelsrod (DE)
Appl. No. 16/976,663
Filed by NIDEC GPM GmbH, Auengrund OT Merbelsrod (DE)
PCT Filed Dec. 13, 2018, PCT No. PCT/EP2018/084743
§ 371(c)(1), (2) Date Aug. 28, 2020,
PCT Pub. No. WO2019/166118, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 102018104770.3 (DE), filed on Mar. 2, 2018.
Prior Publication US 2021/0003147 A1, Jan. 7, 2021
Int. Cl. F04D 29/58 (2006.01); F04D 13/06 (2006.01); F04D 29/70 (2006.01); F04D 7/00 (2006.01); F04D 29/046 (2006.01)
CPC F04D 29/5806 (2013.01) [F04D 13/06 (2013.01); F04D 29/586 (2013.01); F04D 29/5813 (2013.01); F04D 7/00 (2013.01); F04D 13/0653 (2013.01); F04D 29/046 (2013.01); F04D 29/588 (2013.01); F04D 29/708 (2013.01); F05B 2260/232 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An electric coolant pump for conveying a coolant in a cooling circuit to cool a combustion engine of a motor vehicle, said pump comprising:
a pump impeller for accelerating the coolant to be conveyed;
a rotor shaft on which the pump impeller is fixed,
an electric motor for driving the rotor shaft, the electric motor comprising a stator and a rotor,
a control circuit for controlling the electric motor, and
a pump housing accommodating at least the control circuit and the electric motor,
some of the coolant to be conveyed flowing along a flow path through the pump housing, and around the stator, the rotor and the control circuit;
wherein the pump housing is filled with a dielectric coolant fluid comprising the coolant to be conveyed;
wherein the pump housing is fluid-tight relative to atmosphere;
wherein electronic components of the control circuit are in direct contact with the dielectric coolant fluid;
wherein a housing wall of the pump housing is penetrated by the rotor shaft and the pump impeller lies outside the pump housing; and
wherein an inlet opening is formed in the housing wall of the pump housing facing the pump impeller so that some of the coolant to be conveyed flows into the pump housing.