Motor-Driven Compressor Collar Fastener Thermal Contact
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Solution Overview
Problem
The existing motor-driven compressors face challenges in enhancing heat radiation performance due to inadequate contact between the housing and the heat radiating base, which affects the efficient transfer of heat generated by electronic components.
Innovation Solution
The design incorporates a fastener system with a gap maintaining member and a heat radiating member that enhances contact between the circuit board, cover, and housing, using a combination of fastening pins and collars to ensure effective heat transfer by maintaining a consistent gap and applying pressing forces to improve thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the base is arranged on the outer surface of the housing to serve as a heat radiating member, then heat radiation performance is improved, but the contact between the housing and the base is insufficient
Solution Approach 1:
The pressing portion of the fastener is designed to apply pressing force to the base in advance before final assembly completion, ensuring that the base is firmly pressed against the housing outer surface. This preliminary pressing action prevents gaps and ensures optimal thermal contact from the outset of the assembly process.
Solution Approach 2:
The fastener acts as an intermediary mechanism between the housing and the base, transmitting and maintaining the pressing force needed to ensure good thermal contact. The fastener's pressing portion mediates the force application to achieve and maintain the required contact pressure.
2Temperature
If the fastener applies pressing force to enhance contact, then heat radiation performance is improved, but the gap between the member to be fastened and the heat radiating member may be compromised
Solution Approach 1:
The fastener is segmented into distinct functional portions: the fastening pin for mechanical attachment and the pressing portion for applying thermal contact pressure. This segmentation allows each portion to perform its specific function optimally without interfering with the other, maintaining both gap precision and pressing force.
Solution Approach 2:
The gap maintaining member serves as an intermediary element that precisely controls the gap between the member to be fastened and the heat radiating member. It mediates the positioning to ensure the correct gap is maintained while still allowing the pressing force to be applied effectively for thermal contact.
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 configuration significantly improves heat radiation performance by ensuring efficient heat transfer from electronic components to the housing, reducing the size of the inverter module, and simplifying the assembly process while maintaining the structural integrity and insulation properties.
Implementation Method 1
The heat radiating member is arranged between the circuit board and the housing member and on which the electronic component is placed. The heat radiating member radiates heat of the electronic component.
Data Source
AI summary
A motor-driven compressor includes collars, which maintain the gap between a cover and an outer surface of a first housing member. Fasteners fasten the cover to the first housing member. Each collar is arranged to face a seating surface of the head of the corresponding fastener such that the cover is sandwiched between the collars and the seating surfaces. Each collar thus includes a facing portion, which faces the seating surface and receives a pressing force from the seating surface via the cover, and a transmitting portion, which transmits the pressing force received at the facing portion to a base member. Accordingly, the pressing force applied through the seating surface of the fastener is transmitted to the base member through the collar, so that the base member is pressed against the outer surface of the first housing member.