Electric centrifugal pump

Abstract

The invention relates to an electric centrifugal pump. The electric centrifugal pump comprises a water pump housing, a water sealing bearing, a water pump impeller, a spring washer, a motor inner cover, a bearing seat, a rotor front bearing, a motor stator, a motor rotor, a motor rotor shaft, a motor rotor rear bearing, a pilot impeller, a pilot impeller cover, a water pump driving control panel,a controller cover and a motor shell, and an internal forced cooling system is formed by a water pump inlet cavity, an axis through hole of the motor rotor shaft, the pilot impeller, a pilot wheel cavity of the pilot impeller, a spiral overflowing hole of the motor inner cover, a rotor cavity, a spiral overflowing hole of the bearing seat and water pump impeller which are sequentially communicated. The electric centrifugal pump is simple in structure and ingenious in design, the flow loss of water flow is reduced, the cooling effect of the internal cooling system is improved, the heat load problem of the electric centrifugal pump is well solved, and the working reliability of the electric centrifugal pump is improved.

Description

technical field [0001] The invention relates to a centrifugal pump, in particular to an electric electric centrifugal pump applied to an automobile cooling system. Background technique [0002] The cooling water pumps used in automobile cooling systems basically use centrifugal water pumps. With the development of electric vehicles, power components such as drive motors and power batteries of electric vehicles need to be cooled by the cooling system to ensure their working performance and reliability. The cooling system of the car does not have the mechanical water pump driven by the engine of the traditional fuel car, and the electric cooling water pump driven by electricity has become the primary choice. The motor and the motor controller that drives the motor will generate heat during work, and the rotor will overheat. It will lead to the demagnetization of the permanent magnet, the overheating of the stator will cause the insulation of the coil to burn out, and the overh...

AI Technical Summary

Problems solved by technology

[0002] The cooling water pumps used in automobile cooling systems basically use centrifugal water pumps. With the development of electric vehicles, power components such as drive motors and power batteries of electric vehicles need to be cooled by the cooling system to ensure their working performance and reliability. The cooling system of the car does not have the mechanical water pump driven by the engine of the traditional fuel car, and the electric cooling water pump driven by electricity has become the primary choice. The motor and the motor controller that drives the motor will generate heat during work, and the rotor will overheat. It will lead to the demagnetization of the permanent magnet, the overheating of the stator will cause the insulation of the coil to burn out, and the overheating of the controller will cause the components of the controller to burn out. It can be seen that the heat load problem is a major problem that electric water pumps need to solve. The method is to introduce a small amount of water from the high-pressure water chamber of the water pump to the rotor chamber, and then the internal cooling water flows out from the suction port of the pump impeller, which will cause certain flow loss, head loss and power loss. Due to the existence of flow loss and head loss Instead, a large flow of water cannot be used for internal cooling, and after the internal cooling water flowing out of the suction port of the pump impeller is pumped to the high-pressure chamber, a part of the internal cooling water whose temperature has risen will enter the internal cooling water channel again, resulting in cooling. The effect is not good, and some electric water pumps even use immersion cooling in which the internal cooling water does not flow, the internal heat cannot be dissipated well, the cooling effect is poor, and there is a large potential reliability hazard

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