Sealed Compressor Terminal Ground Pin Shield
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Solution Overview
Problem
The existing cable connections for sealed compressors are prone to damage due to the exposed location of the ground pin, which can be contacted or hit, compromising the integrity of the electrical connection and the hermetic seal.
Innovation Solution
A cable connection system that includes a ground wire and connector connected to a ground pin with a shield providing protection, ensuring the ground connection is established before the main power connection, and utilizing a sealing grommet for fluid-tight integrity, with a specific order of connection and disconnection to maintain the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground pin is provided on the terminal housing for electrical connection, then the electrical connection functionality is improved, but the ground pin becomes exposed to damage from external contact or impact
Solution Approach 1:
A shield member is introduced as an intermediary protective element between the external environment and the ground pin. The shield member includes a ground connection that interfaces with the ground pin, allowing electrical functionality while physically protecting the pin from external contact and impact damage.
Solution Approach 2:
The protective structure is segmented into multiple functional zones: an exposed ground connection interface for electrical contact, a shield member providing physical protection, and internal grounding structures. This segmentation allows the ground pin to remain accessible for electrical connection while being physically protected.
2Ease of operation
If the cable connection components are provided outwardly of the terminal housing, then ease of connection is improved, but the components become vulnerable to external damage and contamination
Solution Approach 1:
The shield member is received within a recess of the terminal housing, creating a nested structure. The ground connection extends from the shield member outwardly of the housing, allowing easy access for connection while the shield and recess provide protective nesting that shields the connection components from external damage and contamination.
3Object-affected harmful factors
If the ground connection is made through the shield member, then protection from damage is improved, but the complexity of the connection structure increases
Solution Approach 1:
The shield member serves multiple functions simultaneously: it provides physical protection for the ground pin, establishes the ground electrical connection, and interfaces with both the terminal housing and external ground conductor. This multi-functionality reduces overall structural complexity despite the added protection layer.
Data Source
AI summary
A sealed compressor has an electric motor and a compressor pump unit to be driven by the electric motor. Power is supplied to the electric motor by a terminal plug received within a housing, which communicates electricity through an electric connection and into a shell housing the compressor. A cable is connected to the terminal plug at a location at least partially outwardly of the housing. The cable includes a ground wire and ground connector, which is connected to a ground pin associated with one of the housing and the shell. The cable has a head connected to connections associated with the housing. A shield extends over a ground connection between the cable and the ground pin. A cable and cable head as mentioned above are also disclosed and claimed.