Inverter-Integrated Compressor Cover Structure for Lower Thermal Resistance
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Solution Overview
Problem
The use of multiple heat dissipation sheets or thick sheets in inverter-integrated electric compressors increases cost and thermal resistance, deteriorating heat dissipation performance.
Innovation Solution
An inverter-integrated electric compressor design with a seat portion on the cover protruding towards the circuit board and a heat dissipation sheet placed between the seat portion and the circuit board, along with another sheet between the wall and the circuit board, to secure insulation and improve heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two heat dissipation sheets or a thick heat dissipation sheet is used to secure insulation distance, then insulation distance is improved, but cost increases and thermal resistance increases causing heat dissipation performance to deteriorate
Solution Approach 1:
The invention transitions from increasing thickness (one dimension) to utilizing lateral extension (another dimension) by positioning the seat portion inward from the outer edge of the heat dissipation sheet. This allows the heat dissipation sheet to extend laterally beyond the seat portion, securing insulation distance through horizontal coverage rather than vertical thickness, thereby reducing thermal resistance and improving heat dissipation performance while lowering cost.
2Reliability
If two heat dissipation sheets or a thick heat dissipation sheet is used to secure insulation distance, then insulation distance is improved, but thermal resistance increases causing heat dissipation performance to deteriorate
Solution Approach 1:
The invention replaces thickness-based insulation (one dimension) with lateral extension-based insulation (another dimension). The seat portion is positioned inward from the outer edge of the heat dissipation sheet, allowing the sheet to extend beyond the seat portion horizontally. This reduces the required thickness, thereby reducing thermal resistance and improving heat dissipation performance while maintaining adequate insulation distance.
3Reliability
If the seat portion is located inward of the outer edge portion of the heat dissipation sheet, then insulation distance is secured, but heat dissipation area is reduced
Solution Approach 1:
The invention compensates for the reduced heat dissipation area caused by inward positioning by extending the heat dissipation sheet laterally beyond the seat portion. This lateral extension in another dimension maintains or increases the effective heat dissipation area while securing insulation distance, avoiding the trade-off between insulation and heat dissipation area.
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 reduces the number of sheets, thins the sheets, and enhances heat dissipation performance while lowering costs and weight, allowing for compactification and improved thermal conductivity.
Implementation Method 1
a heat dissipation sheet placed between the seat portion and the circuit board
Data Source
AI summary
An inverter-integrated electric compressor that can suppress a rise in cost when a heat dissipation sheet is provided between a cover of an inverter accommodating portion and a circuit board. The inverter-integrated electric compressor includes a metal housing in which an electric motor is integrated; an inverter for driving the electric motor, an inverter accommodating portion that is formed in the housing and accommodates the inverter, and a metal cover that is fixed to the housing and blocks the inverter accommodating portion. The inverter includes a circuit board having a smoothing capacitor (a heating element), and the inverter-integrated electric motor includes a seat portion that is formed integrally with the cover at a position corresponding to the smoothing capacitor and protrudes toward the circuit board, and a first heat dissipation sheet placed between the seat portion and the circuit board.