Two-Stage Hydrogen Pressure Regulator for Leak-Resistant Flow Control
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Solution Overview
Problem
Conventional hydrogen pressure regulators are susceptible to leakage due to the small size of hydrogen molecules, which can lead to inconsistent pressure delivery to fuel cells, especially when reducing high pressure from hydrogen tanks to the required lower pressure needed by fuel cells.
Innovation Solution
A two-stage pressure regulator design with parallel moving parts, where the first stage reduces high pressure to an intermediate pressure and the second stage further reduces it to a consistent low pressure, minimizing leakage by ensuring that fluid flow does not pass through the valve stems or sensors, and using a mechanically tied arrangement to enhance sealing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-stage pressure regulator is used, then the device complexity is low, but the pressure control precision and leakage resistance are insufficient for hydrogen gas
Solution Approach 1:
The pressure regulator is divided into two independent stages: first stage regulator with valve stem 14 and valve seat 18, and second stage regulator with valve stem 34 and valve seat 38. Each stage independently controls pressure reduction, with the first stage reducing high pressure to intermediate pressure and the second stage reducing intermediate pressure to final low pressure. This segmentation improves pressure control precision while managing device complexity through modular design.
2Reliability
If hydrogen flow passes through valve stems and sensors, then the sensing function is integrated, but gas leakage increases due to small hydrogen molecule size
Solution Approach 1:
The flow path is extracted and separated from the valve stems and sensors. Hydrogen gas flows through dedicated passages (interstage passage 48 and outlet passage 52) that do not pass through the valve stems 14, 34 or sensors 24, 44. This extraction eliminates leakage paths through moving parts while maintaining integrated sensing functionality through mechanical coupling of valve stems to sensors.
Solution Approach 2:
Mechanical coupling elements act as intermediaries to transmit sensing information from sensors 24, 44 to valve stems 14, 34 without allowing gas flow through these components. The mechanical tie connects the sensor output to the valve stem actuation mechanism, enabling indirect communication that prevents hydrogen leakage while maintaining control functionality.
3Ease of manufacture
If parallel moving parts are used in two-stage regulator, then manufacturing simplicity is improved, but the coordination between stages becomes more challenging
Solution Approach 1:
Both valve stems 14, 34 are configured to move in parallel along parallel axes, creating a mechanically equipotential system where both stages operate independently but symmetrically. This parallel configuration simplifies manufacturing and assembly by allowing identical component designs and straightforward alignment, while the independent movement paths prevent coordination conflicts between stages.
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 regulator effectively reduces hydrogen pressure from a high-pressure tank to a consistent low pressure suitable for fuel cells, reducing gas leakage and ensuring reliable operation, with improved manufacturing simplicity and flow coefficients compared to conventional designs.
Implementation Method 1
a first sensor configured to transmit pressure force from a first sensor area to the first valve stem to urge the first valve stem toward the first valve seat
Implementation Method 2
to transmit force from a first spring to the first valve stem to urge the first valve stem away from the first valve seat
Implementation Method 3
a second sensor configured to transmit pressure force from a second sensor area to the second valve stem to urge the second valve stem toward the second valve seat
Implementation Method 4
to transmit force from a second spring to the second valve stem to urge the second valve stem away from the second valve seat
Data Source
AI summary
A regulator for hydrogen or other media can include a regulator body and an inlet into the regulator body. A first regulator stage can be downstream of the inlet and a second regulator stage can be downstream of the first regulator stage. An interstage passage can extend between the first and second regulator stages and an outlet from the regulator body can be downstream of the second regulator stage. The first regulator stage can include a first valve seat, a first valve stem, and a first sensor configured to transmit pressure force to urge the valve stem toward the valve seat. The second regulator stage can include a second valve seat, a second valve stem, and a second sensor configured to transmit pressure force to urge the second valve stem toward the second valve seat.