Integrated Terminal Pin Sealing for Leak-Resistant Motor Feed-Throughs

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Solution Overview

Problem

Existing feed-through and sealing arrangements for electrical connections in electric motors and devices require multiple components, leading to high assembly complexity, potential non-sealing regions, and varying expansion coefficients that cause leakage and damage due to temperature changes.

Innovation Solution

A combined sealing part that integrates both the terminal pin plate seal and cover functions into a single component, using a cylindrical plastic or elastomer sleeve with a flat plate sealing region and oval sealing ring, reducing the number of components and simplifying assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple separate components (metal plate seal and terminal pin cover) are used for sealing and insulation, then sealing function is achieved, but assembly complexity increases and non-sealing regions may form

Engineering Contradiction:

Improvesealing performanceVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the metal plate seal and terminal pin cover into a single integrated sealing component. This unified structure eliminates the interface between separate components, preventing non-sealing regions while reducing assembly complexity. The integrated design maintains both sealing and insulation functions in one element.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated sealing component performs multiple functions simultaneously: it provides sealing against the housing, electrical insulation for the terminal pins, and structural support for the feed-through arrangement. This multi-functionality reduces the total number of components needed while maintaining reliable sealing performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If multiple components with different materials are used, then sealing and insulation functions are achieved, but expansion coefficient differences cause leakage under temperature changes

Engineering Contradiction:

Improvesealing tightnessVSAvoiddimensional stability under temperature

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The integrated sealing component features different regions with locally optimized properties: the plate seal region provides sealing contact with the housing, while the terminal pin cover region provides electrical insulation. This local differentiation within a unified structure allows each region to perform its specific function while maintaining consistent dimensional behavior under temperature changes.

Inventive Principle:

Principle #3Local quality

3Reliability

If separate sealing components are used, then sealing function is provided, but assembly work and production time increase

Engineering Contradiction:

Improvesealing functionVSAvoidassembly efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

By merging the plate seal and terminal pin cover into one integrated component, the patent reduces the number of assembly steps. Instead of installing and positioning multiple separate components, the unified sealing element can be installed as a single unit, significantly improving assembly efficiency and productivity.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If metal plate and plastic cover are used separately, then electrical insulation is provided, but fastening screws may loosen and get lost due to differential expansion

Engineering Contradiction:

Improveelectrical insulationVSAvoidfastening screw retention

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The integrated sealing component eliminates the separate metal plate and plastic cover assembly, removing the fastening screws that were prone to loosening. The unified structure maintains electrical insulation through the terminal pin cover region while providing a more robust construction that resists differential expansion effects.

Inventive Principle:

Principle #5Merging (Combining)

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 integration reduces assembly complexity, minimizes leakage risks, and ensures consistent insulation and sealing performance across temperature variations, thereby enhancing the reliability and efficiency of the electrical connection.

Implementation Method 1

the terminal pin is enclosed by a glass insulation, thereby implementing the aforementioned glass-metal seal

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

a combined sealing part, in which a flat plate sealing region placed on the housing between the metal plate and the sealing surface

Methodology Applied

Scientific EffectSealing:

Implementation Method 3

A plastic sleeve or elastomer seals are used to electrically insulate the electrical connection against the refrigerant

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Data Source

PatentUS12424354B2Feed-through and sealing arrangement

Publication Date: 2025.09.23 HANON SYST CO LTD

AI summary

A feed-through and sealing arrangement of an electrical connection fed through a housing wall of an electric motor or another electric device, the feed-through and sealing arrangement including a terminal pin plate through which a terminal pin is fed, at least one feed-through opening, a sealing surface, and a combined sealing part. The at least one terminal pin cover is inserted into the at least one feed-through opening when feeding-through the terminal pin through the housing wall.