Compressor Piston Unit with Magnetic Bridge and Polymeric Coating
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Solution Overview
Problem
In the automobile industry, particularly for compressors in electric vehicles, there is a need to improve fuel efficiency and performance while reducing the size of compressor packages, which are often larger due to high cooling demands, and transitioning from belt-driven to electric drive systems.
Innovation Solution
A piston unit for compressors is designed with a first and second head and a bridge connecting them, featuring magnetic members with opposing polarities, a coil for forming magnetic force, and a polymeric layer to reduce friction, optimizing the cross-sectional areas for efficient linear reciprocal movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressor package size is increased to meet high cooling capacity demands, then the cooling capacity is improved, but the vehicle weight and space utilization deteriorate
Solution Approach 1:
The patent replaces the traditional belt-driven mechanical compression system with an electromagnetic linear motor system. The electromagnetic actuator generates linear reciprocating motion directly through electromagnetic forces acting on magnetic members, eliminating the need for belts, pulleys, and complex mechanical linkages. This substitution reduces the overall compressor package size while maintaining or improving cooling capacity.
Solution Approach 2:
The piston unit is divided into separate functional components: a first head, a second head, and a bridge connecting them with magnetic members integrated into the bridge. This segmentation allows for optimized spatial arrangement and reduces the overall footprint of the compressor system while maintaining effective cooling capacity.
2Loss of energy
If friction losses are reduced through polymeric coatings, then the coefficient of performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies polymeric material coatings (such as Teflon) to the piston heads and bridge components. These composite material coatings provide low-friction surfaces that reduce energy losses during compression cycles. The coatings are applied as surface layers on existing structural components, which manages manufacturing complexity while achieving significant friction reduction and COP improvement.
3Volume of moving object
If the bridge cross-sectional area is reduced for compactness, then the spatial efficiency is improved, but the structural strength and magnetic force transmission deteriorate
Solution Approach 1:
The bridge is designed with non-uniform cross-sectional areas: the regions connecting to the piston heads have larger cross-sectional areas to provide structural strength and accommodate magnetic members, while the intermediate portion has a reduced cross-sectional area to improve spatial efficiency. This local quality variation optimizes both strength requirements and compactness goals.
Solution Approach 2:
The magnetic members are arranged in specific spatial configurations within the bridge structure, utilizing three-dimensional space efficiently. The magnetic force transmission is achieved through optimized positioning and orientation of magnetic members rather than simply increasing the overall bridge size, allowing compact design while maintaining force transmission capability.
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 enhances the coefficient of performance (COP) by minimizing energy losses due to friction and improving spatial efficiency, allowing for more compact and efficient compressor designs.
Implementation Method 1
a coil that forms the magnetic force
Implementation Method 2
a bridge connecting the first head and the second head, and including a first magnetic member and a second magnetic member having a polarity that is different from that of the first magnetic member
Data Source
AI summary
Disclosed is a piston unit for a compressor including a first head provided in an area for linear reciprocal movement in the compressor, a second head disposed to be spaced apart from the first head along a movement direction of the linear reciprocal movement, and a bridge connecting the first head and the second head, and including a first magnetic member and a second magnetic member having a polarity that is different from that of the first magnetic member, in an area between the first head and the second head.