Variable Flow Pneumatic Transducer for Pressure Adaptability
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Solution Overview
Problem
Conventional flow regulators and transducers provide a constant flow rate, which is ineffective across a wide range of pressures, leading to oscillation and overshoot, and require multiple devices to cover varying operational ranges, increasing costs.
Innovation Solution
A variable flow rate pneumatic transducer module with a pneumatic subassembly using a linear stepper motor or servo motor and cam configuration to control airflow valves, allowing adjustable fluid flow control over a range of pressures through a linear actuating pin that alters the flow area of orifices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed orifice is used to maintain a constant flow rate, then the flow rate is stable, but the device cannot adapt to a wide range of pressures and requires multiple devices for different applications
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed orifice with a variable orifice that can dynamically adjust its flow area based on pressure conditions. The orifice is coupled to a valve stem that can move to change the opening area, allowing the single device to adapt to a wide range of pressures (e.g., 3-30 PSIG) rather than being limited to a specific pressure range.
Solution Approach 2:
The patent implements universality by designing a single flow regulator device that can perform multiple flow rate adjustments across different pressure conditions. The variable orifice mechanism enables one device to replace multiple fixed-orifice devices, each calibrated for different pressure ranges, thereby providing multi-functionality and reducing the number of devices needed.
2Reliability
If conventional flow regulators are used outside their limited pressure range, then oscillation and overshoot occur, but expanding the pressure range requires multiple devices
Solution Approach 1:
The patent applies feedback by incorporating a diaphragm that responds to outlet pressure changes and automatically adjusts the valve stem position to maintain stable flow. The diaphragm senses pressure variations and provides feedback to the valve mechanism, enabling the system to self-correct and maintain control stability across a wide pressure range without oscillation or overshoot.
Solution Approach 2:
The dynamic adjustment capability of the variable orifice allows the device to adapt in real-time to changing pressure conditions. The valve stem can continuously adjust the orifice opening area in response to pressure variations, enabling stable operation across an expanded pressure range (e.g., 3-30 PSIG) without the oscillation problems that plague conventional fixed-orifice regulators outside their design range.
3Adaptability or versatility
If multiple flow regulators are maintained to cover a wide operational range, then all pressure conditions are covered, but the cost of ownership and carrying costs increase
Solution Approach 1:
The patent realizes universality by creating a single multi-functional flow regulator that can handle a wide operational range (e.g., 3-30 PSIG) through its variable orifice mechanism. This eliminates the need to maintain multiple specialized devices for different pressure ranges, reducing inventory requirements and ownership costs while maintaining full operational range coverage.
Solution Approach 2:
The patent merges the functions of multiple fixed-orifice regulators into a single device with a variable orifice. By combining the capabilities of what would otherwise require separate devices into one integrated system with adjustable flow area, the patent reduces the quantity of devices needed from multiple units to a single multi-functional unit.
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 precise control of fluid flow rates across a wide range of pressures, reducing oscillation and overshoot, and minimizing the need for multiple devices, thereby lowering costs and enhancing operational flexibility.
Implementation Method 1
a pneumatic subassembly that utilizes a linear stepper motor to drive a linear actuating pin configured to alternately engage and control the position of a supply actuator and a exhaust (or bleed) actuator
Implementation Method 2
The pneumatic subassembly utilizing a linear stepper motor and linear actuating pin can be replaced with a pneumatic subassembly utilizing a servo motor and cam configuration
Implementation Method 3
a pneumatic subassembly utilizing a servo motor and cam configuration. The cam can include an appropriate dwell portion corresponding to both air supply and exhaust valves and valve stems in a closed position
Implementation Method 4
Each valve stem includes a conical portion sized to linearly engage and symmetrically cooperate with an orifice. The orifice may be designed and configured to seal against air and other fluid flow when engaged against an outer surface of the conical portion
Data Source
AI summary
A variable flow device includes a body supporting a first orifice and a second orifice, and a drive mechanism. The variable flow device further includes a first valve actuator coupled to the drive mechanism and linearly shiftable between a first open position and a first closed position, the first valve actuator incorporates a first valve stem including a first conical portion sized to symmetrically engage the first orifice when the first valve stem is shifted to the first closed position, and a second valve actuator coupled to the drive mechanism and linearly shiftable between a second open position and a second closed position, the second valve actuator incorporates a second valve stem including a second conical portion sized to symmetrically engage the second orifice when the second valve stem is shifted to the second closed position.