Stepper Motor Gas Valve Control for Multi-Fuel Adaptation
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Solution Overview
Problem
Existing gas appliance valve systems face challenges in efficiently adjusting fuel flow rates and pressure regulation, particularly when switching between different fuel types like natural gas and propane, due to the need for new valve designs that require costly regulatory and testing processes.
Innovation Solution
A stepper-motor regulated gas valve control system that includes a main diaphragm chamber, a servo-regulator diaphragm, and a stepper motor to adjust gas flow rates, with a controller converting milliamp signals to stepwise motor movements, allowing for customizable flow profiles and fuel type adaptation without requiring new furnace designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new valve design is introduced to adjust outlet pressure regulation for different fuel types, then adaptability to different fuel types (propane to methane) is improved, but device complexity and regulatory testing requirements increase
Solution Approach 1:
The patent implements a universal valve design that can handle multiple fuel types (propane, natural gas, methane) through a single device. The valve incorporates adjustable parameters and programmable control that allow it to adapt its operation characteristics based on the fuel type being used, eliminating the need for separate valve designs for each fuel type while maintaining compliance with regulatory requirements
2Ease of operation
If a modulating solenoid approach is used to vary valve positioning, then ease of operation for adjusting gas flow is improved, but loss of time for regulatory approval and testing increases
Solution Approach 1:
The patent employs a modulating solenoid approach that replicates the functionality of traditional valve positioning mechanisms while incorporating programmable control. By copying the proven operational characteristics of existing valves and implementing them through a programmable controller, the system achieves ease of operation without requiring entirely new hardware designs, thereby reducing regulatory testing requirements and approval time
3Manufacturing precision
If outlet pressure regulation is adjusted for different fuel types, then manufacturing precision for combustion control is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic pressure regulation where the outlet pressure settings are not fixed but can be adjusted and programmed based on the fuel type being used. The system incorporates programmable parameters that allow the valve to dynamically adapt its pressure regulation characteristics, maintaining manufacturing precision for combustion control while avoiding the complexity of multiple fixed-pressure valve designs
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
Enables efficient and adaptable fuel flow control across different fuel types, reducing development costs and ensuring safe operation by using a single valve design compatible with various fuel-fired heating systems, while maintaining precise control over outlet pressure and flow rates.
Implementation Method 1
a solenoid coil that generates a magnetic field in response to an input signal
Implementation Method 2
A valve member is movable in response to the magnetic field for causing the displacement of a valve element relative to a valve opening to adjust a gas flow rate therethrough
Data Source
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AI summary
A gas valve unit includes a coil that generates a magnetic field in response to an input signal. A valve member is movable in response to the magnetic field for causing the displacement of a valve element relative to a valve opening to adjust a gas flow rate therethrough. The input signal to the coil controls the extent of movement of the valve member. A sensor provides an output indicative of gas pressure at an outlet of the gas valve unit. A setting device provides an input for selection of at least one opening flow rate profile that is a function of outlet pressure over time. A valve controller is configured to control the input signal based in part on the sensor output to control the valve element to provide a desired outlet pressure over time corresponding to the opening flow rate profile selected by the setting device.