Electric Water Pump Rotor Assembly With Rib-Locked Plastic Layers
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Solution Overview
Problem
Conventional electric water pumps have high costs due to the consumption of neodymium-iron-boron material for magnetic rings and high-cost, difficult-to-process graphite bearings, and suffer from disconnection issues between components, leading to reduced reliability.
Innovation Solution
The electric water pump incorporates a rotor assembly with an iron core body, a first plastic moulding layer replacing the magnetic ring, and a second plastic moulding layer replacing the graphite bearing, featuring protruding ribs for enhanced connection strength and positioning features for accurate magnetization, reducing material consumption and processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional water pump with separate bearing housing is used, then the bearing protection is provided, but the number of parts is large and assembly is complex
Solution Approach 1:
The patent merges the bearing housing with the pump housing to form a single integrated structure. The bearing is directly mounted within the pump housing, eliminating the need for a separate bearing housing component. This integration reduces the total number of parts while maintaining bearing protection functionality through the unified housing design.
2Ease of manufacture
If a conventional water pump with cooling channels is used, then the bearing cooling is provided, but the manufacturing complexity is high
Solution Approach 1:
The cooling channels are integrated directly into the pump housing structure, eliminating the need for separate cooling components or complex assembly. The housing itself serves dual functions as both structural support and cooling pathway, allowing coolant to flow through passages formed within the housing material, thereby simplifying manufacturing while providing effective bearing cooling.
3Device complexity
If a mechanical seal with O-rings is used, then the sealing function is provided, but the number of sealing elements is large
Solution Approach 1:
The patent extracts and eliminates the O-rings from the mechanical seal assembly, retaining only the essential mechanical seal components. The seal housing and seal ring are designed to work together without requiring additional O-ring elements, reducing the number of sealing components while maintaining the sealing function through the refined mechanical seal design.
4Device complexity
If a conventional pump housing design is used, then the structure is simple, but the bearing housing integration is poor
Solution Approach 1:
The pump housing and bearing housing are merged into a single integrated component. The housing design incorporates bearing mounting features and cooling channels directly within the pump housing structure, eliminating the need for a separate bearing housing. This integration maintains structural simplicity while achieving excellent bearing housing integration, as the housing serves multiple functions simultaneously.
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 lowers production costs, improves connection reliability, and enhances the rotor assembly's performance by ensuring components remain integrated during high-speed operation, thereby increasing the electric water pump's efficiency and reliability.
Implementation Method 1
a bearing cooling concept is provided in which cooling channels (32) are integrated into the pump housing (30)
Implementation Method 2
a mechanical seal (20) is provided without O-rings, with a seal housing (21) and a seal ring (22)
Data Source
Figure 1
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AI summary
An electric water pump (100) including a rotor assembly (30), wherein the rotor assembly (30) includes an iron core body (31) having a central through-hole (301), a plurality of magnetic plates (32) disposed inside the iron core body (31), a first plastic coating layer (33) for enclosing the iron core body (31), and a second plastic coating layer (34). At least one protruding rib (302) is provided on a top surface and/or a bottom surface of the first plastic coating layer (33), a recess (342) matching the protruding rib (302) is provided on the second plastic coating layer (34), and the first plastic coating layer (33) can drive the second plastic coating layer (34) to rotate relative to an axis of the central through-hole (301) of the iron core body (31).