Side-Mount Rotary Encoder Assembly for Gas Valve Replacement

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Solution Overview

Problem

Existing gas ranges face difficulties in controlling low heat output due to challenges in managing low gas flow rates, which requires complex pulsing strategies and makes assembly and replacement of rotary encoders cumbersome, risking damage and requiring complete disassembly.

Innovation Solution

A rotary encoder designed to be installed perpendicular to the valve stem, allowing sideways mounting and partial assembly, with a housing and wiper assembly that includes alignment pins and a printed circuit board for secure attachment and easy electrical connection, enabling installation and replacement without full console disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the rotary encoder is installed before the valve stem is inserted through the console, then the encoder can be properly positioned, but the assembly process becomes more complex and the encoder is at risk of damage during subsequent mechanical assembly

Engineering Contradiction:

Improveencoder safetyVSAvoidassembly process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The rotary encoder assembly is divided into separate components that can be pre-assembled on the valve stem outside the console, then installed as a complete unit through the console aperture. This segmentation allows the encoder to be positioned safely before final installation without requiring complex disassembly procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of installing the encoder through the console aperture from the front, the invention allows the encoder to be attached to the valve stem from the rear side of the console. This inverted installation approach eliminates the risk of damage during assembly while maintaining proper positioning.

Inventive Principle:

Principle #13The other way round (Inversion)

2Measurement precision

If the rotary encoder is installed early in the assembly process, then proper positioning is achieved, but complete disassembly is required for replacement increasing repair complexity

Engineering Contradiction:

Improverotational position detectionVSAvoidencoder replacement

Core Design Contradiction:

Measurement precisionVSEase of repair

Solution Approach 1:

The rotary encoder is extracted as a separate, self-contained unit that can be removed from the valve stem without disassembling the console or other range components. This extraction capability enables simple replacement procedures while maintaining precise rotational position detection functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

3Strength

If traditional encoder installation methods are used, then secure attachment is achieved, but the console must be fully disassembled for installation and replacement

Engineering Contradiction:

Improveencoder attachment securityVSAvoidassembly disassembly requirements

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The rotary encoder housing is designed to fit within the console structure, with the encoder itself nested on the valve stem. This nested configuration allows the encoder to be securely attached while accessing it through the console aperture without requiring full disassembly of the console assembly.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS8766116B2Rotary encoder suitable for a use with a gas valve on a range

Publication Date: 2014.07.01 ILLINOIS TOOL WORKS INC

AI summary

A valve stem position sensor for a gas range provides a slotted housing, wiper assembly, and printed circuit board that may be aligned to allow the sensor to be installed on the valve stem from the side of the valve stem rather than over the end of the valve stem permitting the valves to be partially installed in the gas range with the valve stems extending through the console for mechanical support during the remainder of the assembly process.