Two-Stage Gas Regulator Assembly for High Pressure Cylinder
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Solution Overview
Problem
Conventional regulator assemblies for pressurized gas cylinders require high torque for manual adjustment and excessive energy for electric motor operation, especially at high outlet pressures, leading to user fatigue and potential damage from pressure surges.
Innovation Solution
A two-stage regulator system where a first stage regulator reduces high cylinder pressure to a lower range, allowing the pilot regulator to control outlet pressure with significantly reduced force and energy requirements, and incorporating a shut-off valve either separately or integrally with the first stage regulator to enhance stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a conventional single-stage regulator is used to control high pressure gas (300 bar or more), then the regulator can reduce pressure to below 10 bar, but the torque required for manual adjustment becomes excessively high and energy consumption becomes prohibitive
Solution Approach 1:
The regulator is divided into two independent stages: a first stage regulator that receives high pressure gas from the cylinder and reduces it to an intermediate pressure, and a second stage regulator that receives the intermediate pressure gas and reduces it to the final outlet pressure. This segmentation allows each stage to operate with smaller pressure differentials, dramatically reducing the torque required for adjustment while maintaining the overall pressure reduction capability from 300 bar to below 10 bar.
2Extent of automation
If the regulator is operated with an electric motor controlled by an on-board power supply, then automated pressure control is achieved, but the energy requirement becomes prohibitive
Solution Approach 1:
The two-stage regulator design reduces the energy consumption of electric motors by splitting the total pressure reduction into two smaller steps. Each motor only needs to overcome the torque required for its specific stage's pressure differential, rather than the full torque needed for a single-stage regulator. This segmentation dramatically reduces the power supply capacity required, making automated operation feasible with smaller, more efficient motors.
3Stress or pressure
If the regulator is exposed to high pressure cylinder gas, then pressure reduction is effective, but pressure surges can cause damage and instability
Solution Approach 1:
The first stage regulator acts as a buffer between the high pressure cylinder and the second stage regulator. It absorbs and dampens pressure surges from the cylinder before they reach the second stage, protecting the more sensitive components from damage and improving overall system reliability while maintaining effective pressure reduction.
Solution Approach 2:
The first stage regulator provides beforehand cushioning by absorbing pressure surges and transient changes before they propagate through the system to the second stage regulator. This protective buffering effect prevents damage to downstream components and stabilizes the intermediate pressure, ensuring reliable operation of the entire regulator assembly.
4Adaptability or versatility
If the regulator operates over a wide pressure range, then it can handle varying cylinder pressures, but accuracy decreases and more adjustments are required
Solution Approach 1:
By dividing the pressure reduction into two stages, each regulator operates over a narrower, more manageable pressure range. The first stage handles theç²— reduction from 300 bar to an intermediate pressure, while the second stage performs the fine reduction to the final outlet pressure. This segmentation improves accuracy because each stage operates within optimal pressure differentials, reducing the frequency of adjustments needed and maintaining stable outlet pressure even as cylinder pressure varies.
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 two-stage system reduces user effort and energy demand, enhances accuracy, and protects the pilot regulator from high-pressure surges, resulting in improved outlet pressure stability and reduced complexity.
Implementation Method 1
a first stage regulator which receives the high pressure gas from the cylinder and reduces the pressure to an intermediate pressure
Implementation Method 2
a second stage regulator which receives intermediate pressure gas from the first stage regulator and maintains a constant outlet pressure
Implementation Method 3
a spring which applies a force to the piston
Data Source
Figure 1
Figure 2A~2C
AI summary
The regulator assembly has a first stage regulator with a first inlet for receiving high pressure gas from the cylinder. A first regulator element reduces the pressure of the gas which exits the first stage regulator via a first outlet at a regulated pressure. A second stage regulator is provided with a second inlet for receiving the gas at the regulated pressure, and a second regulator element further reduces the pressure of the gas which exits the second stage regulator via a second outlet at an outlet pressure which is lower than the regulated pressure. A pilot regulator receives gas at the regulated pressure from the first stage regulator. The pilot regulator is controlled by an actuator to set a pilot pressure which is communicated to the second stage regulator to set the outlet pressure delivered by the second stage regulator.