Hermetic Terminal Layout for Compact Motor-Driven Compressors
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Solution Overview
Problem
The rigidity of the support plate in motor-driven compressors needs to be increased to withstand fluid pressure, which can interfere with the inverter if fixed in the inverter chamber, necessitating additional space and increasing the compressor's size.
Innovation Solution
The support plate is fixed in the motor chamber, with a conductive member passing through a through-hole, and a cluster block with a seal surface contacting the support plate, ensuring the support plate is not affected by refrigerant pressure, and the hermetic terminal provides a seal between chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the support plate is increased to withstand fluid pressure, then the rigidity and strength of the support plate are improved, but the support plate interferes with the inverter when fixed in the inverter chamber, requiring additional space and increasing the compressor size
Solution Approach 1:
The support plate is relocated from the inverter chamber to the motor chamber, inverting the conventional arrangement. This allows the support plate to be positioned where it can withstand fluid pressure without interfering with the inverter, as the motor chamber is separated from the inverter chamber by a partition wall. The hermetic terminal's conductive member passes through the partition wall to maintain electrical connection across chambers.
Solution Approach 2:
The housing is divided into separate motor chamber and inverter chamber by a partition wall, segmenting the internal space. This segmentation allows the support plate to be placed in the motor chamber where it can be thicker and stronger without occupying space needed by the inverter in the inverter chamber, thus resolving the conflict between support plate strength and compressor size.
2Reliability
If the support plate is fixed in the inverter chamber to block the through-hole, then the sealing is improved, but the increased thickness of the support plate interferes with the inverter and requires additional space
Solution Approach 1:
The support plate is inverted from being located in the inverter chamber to being located in the motor chamber. This inversion maintains the sealing function by still blocking the through-hole (now from the motor chamber side) while eliminating interference with the inverter, simplifying the space arrangement.
Solution Approach 2:
The partition wall acts as an intermediary between the motor chamber and inverter chamber. The conductive member passes through this intermediary structure to maintain electrical connection, while the support plate blocks the through-hole in the partition wall from the motor chamber side, achieving sealing without complicating the inverter chamber space.
3Strength
If additional space is created in the inverter chamber to accommodate a thicker support plate, then the support plate can withstand fluid pressure, but the overall size of the motor-driven compressor increases
Solution Approach 1:
Instead of adding space in the inverter chamber to accommodate a thicker support plate, the support plate is inverted to the motor chamber. This allows the support plate to achieve the necessary thickness and strength while using space that would otherwise be unused, as the motor chamber does not require the same clearance as the inverter chamber.
Solution Approach 2:
The problem is solved by changing the spatial dimension of the solution - rather than increasing the thickness dimension of the support plate in the inverter chamber (which conflicts with inverter space), the support plate is moved to the motor chamber where thickness can be increased without affecting the inverter, effectively using available space in a different dimensional context.
Data Source
AI summary
A motor-driven compressor includes a housing that defines a motor chamber and an inverter chamber. The housing includes a partition wall that separates the motor chamber from the inverter chamber. A hermetic terminal includes a conductive member that passes through a through-hole. The conductive member has a first end electrically connected to an inverter and a second end electrically connected to a connection terminal. The hermetic terminal also includes a support plate fixed to the partition wall while supporting the conductive member and blocking the through-hole. The cluster block includes a conductive member insertion hole through which the second end of the conductive member is inserted. The support plate is fixed to the partition wall while being arranged in the motor chamber. A periphery of the conductive member insertion hole in the cluster block includes a seal surface that makes surface contact with the support plate.