Electric-motor-driven liquid pump
First Claim
1. A liquid pump that is driven by an electric motor, comprising:
- a housing, which has a suction connection and a pressure connection, the electric motor housed in said housing and which comprises a stator and a rotor which is received within the stator to leave an annular gap;
said rotor being drivable for rotation about an axis of rotation;
a conveying device, which is in drive connection with the rotor and which has a suction inlet that, via a fluid path for an unpressurized liquid, is in fluid connection with the suction connection of the housing and a pressure outlet that, via a fluid path for a pressurized liquid, is in fluid connection with the pressure connection of the housing; and
an electronic power unit for driving of the electric motor;
wherein the housing comprises a partition wall which extends substantially transversely to the axis of rotation and is adjacent to the rotor; and
said electronic power unit being mounted on a side of said partition wall remote from the rotor;
said liquid pump being characterized in that the suction inlet of the conveying device is arranged at a radial height with respect to the axis of rotation which is smaller than an inner radius of the annular gap, and the rotor has at least one passage which extends at a radial height increasing or substantially constant in direction towards the suction inlet of the conveying device with respect to the axis of rotation so that the unpressurized liquid inducted by the suction inlet of the conveying device via the suction connection of the housing is constrainedly guided in part by way of the annular gap between rotor and stator and undergoes deflection at the partition wall of the housing with cooling thereof before it passes through the passage of the rotor to the suction inlet of the conveying device, wherein the annular gap and the passage of the rotor form part of the fluid path for the unpressurized liquid.
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Accused Products
Abstract
A liquid pump has a housing with a suction connection, a pressure connection and a electric motor for rotationally driving a conveying device that has a suction inlet and pressure outlet which communicate with the suction connection and the pressure connection respectively. An electronic power unit for the electric motor is adjacent to the motor and extends transversely to the axis of rotation and is on the rear side of the partition wall of the housing. The suction inlet is arranged at a height smaller than an inner radius of an annular gap between the stator and rotor, whereas a rotor passage extends at a constant height, so that a liquid inducted by way of the suction connection is guided in part via the annular gap and undergoes a deflection at the partition wall, cooling the latter before it passes through the rotor passage to the suction inlet.
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Citations
20 Claims
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1. A liquid pump that is driven by an electric motor, comprising:
- a housing, which has a suction connection and a pressure connection, the electric motor housed in said housing and which comprises a stator and a rotor which is received within the stator to leave an annular gap;
said rotor being drivable for rotation about an axis of rotation;
a conveying device, which is in drive connection with the rotor and which has a suction inlet that, via a fluid path for an unpressurized liquid, is in fluid connection with the suction connection of the housing and a pressure outlet that, via a fluid path for a pressurized liquid, is in fluid connection with the pressure connection of the housing; and
an electronic power unit for driving of the electric motor;
wherein the housing comprises a partition wall which extends substantially transversely to the axis of rotation and is adjacent to the rotor; and
said electronic power unit being mounted on a side of said partition wall remote from the rotor;
said liquid pump being characterized in that the suction inlet of the conveying device is arranged at a radial height with respect to the axis of rotation which is smaller than an inner radius of the annular gap, and the rotor has at least one passage which extends at a radial height increasing or substantially constant in direction towards the suction inlet of the conveying device with respect to the axis of rotation so that the unpressurized liquid inducted by the suction inlet of the conveying device via the suction connection of the housing is constrainedly guided in part by way of the annular gap between rotor and stator and undergoes deflection at the partition wall of the housing with cooling thereof before it passes through the passage of the rotor to the suction inlet of the conveying device, wherein the annular gap and the passage of the rotor form part of the fluid path for the unpressurized liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- a housing, which has a suction connection and a pressure connection, the electric motor housed in said housing and which comprises a stator and a rotor which is received within the stator to leave an annular gap;
Specification