Electric water pump with efficient heat dissipation and vibration reduction structure

Abstract

The invention relates to an electric water pump with an efficient heat dissipation and vibration reduction structure. The electric water pump comprises a rear cover, a rear cover sealing ring, a waterpump controller, a coil connecting terminal, a stator coil sheath, a coil, a motor stator, a motor shell, an inner cover, a water pump volute, a water pump impeller, a motor rotor shaft, an axial thrust wheel, a rotor front bearing, a rotor front bearing vibration reduction ring, a bearing seat, a motor rotor, an inner cover small-head sealing ring, a rotor rear bearing vibration reduction ring,a rotor rear bearing, an axial-flow-type guide impeller, a breathing device bracket, a gas-permeable membrane, a breathing device sealing ring and an elastic cylindrical pin. According to the electricwater pump with the efficient heat dissipation and vibration reduction structure, a multistage vibration reduction structure is adopted to restrain vibration of the electric water pump to the minimum, through an internal water-cooling system, a structure for improving coil heat dissipation on a motor stator and the cooperation between breathing and cooling of breathing out inner cavity hot air from a breathing system to suck in external cold air, thermal loads of the electric water pump are restrained, the heat dissipation efficiency is greatly enhanced, and high operational reliability of the electric water pump is improved.

Description

technical field [0001] The invention relates to an electric water pump, in particular to an electric water pump with high-efficiency heat dissipation and vibration damping structure applied to the cooling system of an automobile. Background technique [0002] 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. Water pumps can only use electric water pumps driven by electricity. The motor and the motor controller that drives the motor will generate heat during work. The overheating caused by the rotor magnetic eddy current will lead to the demagnetization of the rotor permanent magnet, and the overheating of the stator will cause the coil insulation to burn. , the overheating of the controller will cause the components of the controller to burn out. [0003] The cooling method adopted by the existing electric water...

AI Technical Summary

Problems solved by technology

[0002] 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. Water pumps can only use electric water pumps driven by electricity. The motor and the motor controller that drives the motor will generate heat during work. The overheating caused by the rotor magnetic eddy current will lead to the demagnetization of the rotor permanent magnet, and the overheating of the stator will cause the coil insulation to burn. , the overheating of the controller will cause the components of the controller to burn out

[0003] The cooling method adopted by the existing electric water pump is to introduce a small amount of water from the high-pressure water chamber of the water pump to the inside of the electric water pump, and then the internal cooling water flows out from the water suction port of the water pump impeller, which will cause certain flow loss and head loss as well as power loss. Due to the loss of flow, head loss and power loss, it is impossible to use large flow of water for internal cooling, resulting in poor cooling effect inside the electric water pump, and some existing electric water pumps even use the immersion type in which the internal cooling water does not flow. Cooling, the internal heat cannot be dissipated well, the cooling effect is poor, and there is a hidden danger of overheating damage to the electric water pump

[0004] In addition, the stator coil will vibrate under the action of the alternating magnetic field force of the stator. The alternating magnetic field of the stator driving the motor will cause torsional vibration to the motor rotor. The impeller of the water pump will generate torsional vibration during the pumping process, and the water will flow inside The turbulence of the turbulent flow will produce turbulent vibration, and the pumping operation of the impeller of the axial flow pump will produce vibration, which will affect the vibration performance of the electric water pump; The air in the inner cavity of the electric water pump is heated and cooled to cause thermal expansion and contraction, which leads to changes in the air pressure in the inner cavity of the electric water pump. There is a pressure difference between the inside and outside of the electric water pump, which causes additional stress on the structural parts of the electric water pump, which affects the reliability of the electric water pump.

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