Dual Diaphragm Fluid Regulator Flow Stability
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Solution Overview
Problem
Conventional gas regulators face performance issues due to environmental and mechanical factors, leading to instability and inefficiency in delivering gas at consistent pressures, especially in gas distribution systems for end-user facilities like furnaces and ovens.
Innovation Solution
A dual stage fluid regulator design incorporating a pair of diaphragms, where the first diaphragm is coupled to the first stage control element and the second diaphragm acts as a dampener, providing enhanced stability and resistance to movement, thereby improving flow consistency and resistance to adverse factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single diaphragm is used in the first stage control element, then the device complexity is reduced, but the flow stability deteriorates due to high-frequency instability and sensitivity to environmental factors
Solution Approach 1:
The first diaphragm is segmented into two separate diaphragms (first diaphragm and second diaphragm) that are coupled together at their radially inner portions. This segmentation allows each diaphragm to contribute differently to the control element operation, with the second diaphragm specifically providing dampening effects to reduce high-frequency instability while the first diaphragm maintains the basic pressure sensing function.
2Reliability
If a conventional dual stage regulator is used, then the device is simpler and easier to manufacture, but it exhibits high-frequency instability and sensitivity to environmental and mechanical factors
Solution Approach 1:
The second diaphragm acts as an intermediary dampening element between the first diaphragm and the first stage control element. This intermediary diaphragm filters out high-frequency disturbances and environmental fluctuations before they reach the control element, thereby improving reliability and resistance to environmental factors while adding manageable complexity to the manufacturing process.
3Speed
If the first stage control element responds rapidly to pressure changes, then the response speed is improved, but flow stability deteriorates due to high-frequency oscillations
Solution Approach 1:
The dual diaphragm configuration introduces a dampening effect that creates a more controlled, less oscillatory response to pressure changes. The second diaphragm acts as a mechanical filter that allows the system to respond to pressure changes while suppressing high-frequency oscillations, achieving a balance between response speed and flow stability.
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
The dual diaphragm arrangement enhances flow stability, reduces high-frequency instability, and maintains consistent flow capacity, even at low temperatures, while being resistant to gas impurities and environmental factors, thus improving overall performance.
Implementation Method 1
the first stage control element arranged to respond to fluid pressure changes to control flow of a process fluid through the first stage orifice
Implementation Method 2
the actuator arranged to respond to fluid pressure changes in the fluid outlet to move the second stage control element between the open position and the closed position to control flow of the process fluid through the second stage orifice
Data Source
Figure 1
Figure 2
Figure 3~3A
AI summary
A fluid regulator includes a regulator body having a fluid inlet and a fluid outlet connected by a fluid flow path, with a portion of the regulator body forming a first chamber and a second chamber, an orifice disposed in the fluid flow path, a seat, and a control element disposed within the fluid flow path and shiftable between an open position spaced away from the seat and a closed position seated against the seat, with the control element arranged to respond to fluid pressure changes to control flow of a process fluid through the orifice. A first diaphragm having a radially inner portion is operatively coupled to the control element, and a second diaphragm having a radially inner portion also is operatively coupled to the control element.