Inverter-Integrated Compressor Heat-Radiating Block
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Solution Overview
Problem
The use of polyalkyl glycol (PAG) refrigeration lubricant in inverter-integrated electrical compressors requires a raised partitioning wall for insulation, complicating the structure, increasing size and cost, and necessitating multiple components and a busbar, which makes the compressor larger, heavier, and more expensive.
Innovation Solution
The integration of semiconductor switching elements on a heat-radiating block positioned vertically relative to the partitioning wall allows for a single circuit board configuration, eliminating the need for a raised partitioning wall and busbar, enabling a more compact, lightweight, and cost-effective design by directly connecting components and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the height of the partitioning wall is raised to ensure insulation between the sealed terminal and motor winding when using PAG lubricant, then insulation performance is improved, but the structure becomes more complex and the device size increases
Solution Approach 1:
An insulation member is introduced as an intermediary component between the sealed terminal and the motor winding. This insulation member provides the necessary electrical isolation when using PAG lubricant with low insulating performance, without requiring the partitioning wall to be raised, thus maintaining structural simplicity while ensuring adequate insulation.
2Reliability
If the height of the partitioning wall is raised to ensure insulation, then insulation performance is improved, but the device weight and cost increase
Solution Approach 1:
The insulation member serves as a lightweight intermediary that provides necessary electrical isolation without requiring additional housing material or structural modifications. This approach maintains insulation performance while avoiding the weight penalty associated with raising the partitioning wall height.
3Temperature
If the partitioning wall is raised to accommodate semiconductor switching elements for cooling, then cooling performance is improved, but the space for circuit board installation is restricted
Solution Approach 1:
The semiconductor switching elements are mounted on the partitioning wall in a vertical arrangement rather than requiring a large horizontal area. This dimensional change allows adequate cooling contact area while preserving sufficient space on the circuit board for component installation and routing.
4Temperature
If the partitioning wall is raised to bring semiconductor switching elements closer to the circuit board, then cooling performance is improved, but a busbar becomes necessary increasing device complexity
Solution Approach 1:
The partitioning wall is designed to integrate multiple functions: it serves as the cooling surface for semiconductor switching elements, provides structural support, and eliminates the need for separate busbar components by incorporating terminal connections directly into the wall structure. This merging of functions reduces component quantity while maintaining effective cooling.
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 results in a smaller, lighter, and less expensive inverter-integrated electrical compressor with enhanced heat dissipation and insulation, reducing component count and assembly complexity while ensuring sufficient insulation and cooling performance.
Implementation Method 1
the plurality of semiconductor switching elements are installed in a fixed manner on the side face of a heat-radiating block disposed in the vertical direction relative to the partitioning wall
Implementation Method 2
the semiconductor switching elements and high-voltage electric components of the inverter device assembled in the interior thereof are cooled using this partitioning wall as a heat sink
Data Source
AI summary
The inverter-integrated electrical compressor is provided with an inverter-accommodating case (2) partitioned by a partitioning wall (3) and a low-pressure refrigerant channel inside a housing, an inverter device (1) being incorporated within the inverter-accommodating case (2); wherein the inverter device (1) is provided with a plurality of high-voltage electric components (5, 6) constituting a filter circuit, a plurality of semiconductor switching elements (7), and a control substrate (8) on which an inverter circuit and a control circuit are mounted; and the plurality of semiconductor switching elements (7) are installed in a fixed manner on the side surfaces (17) of a heat-radiating block (16) provided perpendicularly relative to the partitioning wall (3).