Electric Liquid Pump With Thermosetting-Resin Shaft Support
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Solution Overview
Problem
Existing electric liquid pumps are difficult to further miniaturize and reduce weight, despite some efforts in reducing size and weight.
Innovation Solution
The electric liquid pump design incorporates a motor rotor with a bonded magnet and a shaft integrated with one axial end, a stator outside or inside the magnet, an inner rotor with external teeth, an outer rotor with internal teeth forming a gap volume, a motor case with accommodation chambers, and a body supporting the shaft using a thermosetting resin instead of metal bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal bearings and traditional motor rotor structure are used, then the pump can support the shaft reliably, but the overall weight and size of the electric liquid pump increase
Solution Approach 1:
The patent replaces metal bearings with a liquid-filled chamber system where the liquid provides buoyancy and damping to support the shaft. The motor rotor shaft is supported by a chamber filled with liquid rather than traditional metal bearing components, substituting a mechanical support system with a fluid-based support system that reduces weight while maintaining reliability.
Solution Approach 2:
The patent changes the material parameter from solid metal bearings to liquid medium for shaft support. By using liquid with appropriate density and viscosity properties, the system achieves shaft support functionality with reduced weight compared to metal bearings, while the liquid's physical properties provide necessary damping and support characteristics.
2Power
If a large-diameter motor rotor is used, then the motor can provide sufficient power, but the pump size and weight increase
Solution Approach 1:
The patent uses a composite structure for the motor rotor where the shaft is made of lightweight material (such as aluminum alloy or composite material) rather than traditional heavy metal. This composite approach maintains the structural integrity and power transmission capability while significantly reducing the weight of the rotor assembly.
Solution Approach 2:
The patent integrates the shaft directly into the motor rotor structure with the magnet portion, creating a nested configuration where the shaft is integrated with one axial end of the motor rotor and the magnet portion is integrated with the shaft. This integration eliminates separate components and reduces overall weight while maintaining power output.
3Strength
If traditional metal components are used throughout the pump, then structural strength is sufficient, but the overall weight increases
Solution Approach 1:
The patent employs composite materials strategy by using lightweight materials (such as aluminum alloys, magnesium alloys, or composite materials) for the pump body instead of traditional heavy metals. This maintains sufficient structural strength for pump operation while achieving significant weight reduction in the overall assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves significant weight reduction and reduces rotational torque, allowing for a smaller stator and overall pump size without the need for metal bearings, while maintaining functionality and lubrication through liquid circulation.
Implementation Method 1
the liquid circulates through the first accommodation chamber, the second accommodation chamber, and the hole-shaped communication portion
Implementation Method 2
a magnet portion that is a bonded magnet
Implementation Method 3
a stator that is disposed radially outside or inside the magnet portion and rotates the motor rotor
Implementation Method 4
each of the inner rotor, the outer rotor, and the body is made of a thermosetting resin
Data Source
AI summary
An electric liquid pump has a motor, a liquid pump including an inner rotor having an external tooth and integrated with an axial end of a shaft of the motor and an outer rotor having an internal tooth meshing with the external tooth and forming a gap into which a liquid is suctioned and from which the liquid is discharged, a motor case having a box shape and including therein a first accommodation chamber, a second accommodation chamber, and a partition wall allowing the first and second accommodation chambers to communicate with each other, and a body including a centering body portion, a general body portion, and a bearing portion formed to penetrate the centering body portion and the general body portion. Each of the inner rotor, the outer rotor, and the body is made of a thermosetting resin, and the magnet portion is a bonded magnet.