Disconnecting Switch Two-Shell Housing Weather Resistance

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Solution Overview

Problem

Existing disconnecting switch devices face challenges in achieving good weather resistance when using materials with good electrical characteristics, as these materials are often unsuitable for outdoor use.

Innovation Solution

A two-shell housing design is employed, where the first shell provides protection against external influences and is made from a UV-resistant insulating material, while the second shell is chosen for its electrical characteristics, and a polyurethane material is used to form a moisture-tight assembly with an integral joint, ensuring electrical isolation and preventing parallel current paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If materials with good electrical characteristics are used for the housing, then electrical isolation is improved, but weather resistance deteriorates

Engineering Contradiction:

Improveelectrical isolationVSAvoidweather resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The housing is divided into two separate shells: a first shell made from weather-resistant material and a second shell made from material with good electrical characteristics. This segmentation allows each shell to optimize for its specific function, resolving the contradiction between weather resistance and electrical isolation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The housing combines two different materials with complementary properties: the first shell uses weather-resistant material (such as UV-stable plastic) and the second shell uses electrically insulating material. This composite structure achieves both weather resistance and electrical isolation simultaneously.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If a two-shell housing design is used, then weather resistance is improved, but device complexity increases

Engineering Contradiction:

Improveweather resistanceVSAvoidhousing structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The second shell is nested inside the first shell, with the first shell acting as a lost shell or permanent shuttering for the second shell. This nesting arrangement simplifies assembly and reduces the need for auxiliary tools, offsetting the complexity increase from having two shells.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The first shell is designed as a lost shell that serves as permanent shuttering during the injection molding process of the second shell. This preliminary action integrates the first shell into the manufacturing process itself, reducing assembly complexity and the need for additional tools.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8106321B2Disconnecting switch device and method for production of a disconnecting switch device

Publication Date: 2012.01.31 SIEMENS ENERGY GLOBAL GMBH & CO KG

AI summary

A circuit breaker device has a first electrode piece and a second electrode piece. In order to ensure protection from weather, the circuit breaker device is equipped with an electrically isolating housing. The electrically isolating housing has a first shell and a second shell. The first shell serves as a volatile casing for the second shell during production.