CNG Flow Regulator Mechanical Bypass Valve
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Solution Overview
Problem
Existing CNG flow regulators in the automotive industry often rely on complex electrical systems that can fail, necessitating a mechanical bypass valve to enable regulated and bypass modes without compromising operability and performance, while also addressing issues of pressure variability and cooling efficiency.
Innovation Solution
A flow regulator with a mechanical bypass valve that includes a movable sensing piston biased by a control spring, allowing for adjustable operation between regulated and bypass modes, along with a finned coolant bowl for enhanced cooling and a balance valve to stabilize pressure variations, all without requiring external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical bypass valve is added to enable both regulated and bypass modes, then reliability is improved by eliminating electrical system dependency, but device complexity increases due to additional mechanical components
Solution Approach 1:
The patent combines the bypass valve mechanism with the regulator body into a single integrated assembly. The bypass valve shares the same housing and fluid passage system as the regulator, eliminating the need for separate electrical components while maintaining both regulated and bypass operational modes within one unified device structure.
Solution Approach 2:
The mechanical bypass valve is designed to automatically respond to inlet pressure conditions without requiring external control systems. The valve mechanism self-regulates based on pressure differential across the regulator, using the fluid pressure itself to actuate the valve opening and closing actions, thereby eliminating dependency on electrical power or control systems.
2Reliability
If the bypass valve is initially maintained in the open position as a failsafe, then reliability is improved by ensuring gas flow continuity, but loss of time occurs during the transition to regulated mode
Solution Approach 1:
The bypass valve is pre-configured in the open position during manufacturing and installation, ensuring immediate gas flow continuity upon system activation. This preliminary state allows the system to operate safely in bypass mode until the regulator is fully activated, at which point the valve automatically transitions to the closed position without requiring manual intervention or causing operational delays.
3Temperature
If a finned coolant bowl is added to prevent hydrocarbon condensation, then temperature control is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The coolant bowl incorporates fins only in the specific regions where heat dissipation is most critical - namely the areas surrounding the regulated gas passage and adjacent to potential condensation zones. This localized finning approach provides effective temperature control where needed while minimizing the overall manufacturing complexity compared to a fully finned structure.
4Measurement precision
If the sensing piston is made movable to respond to inlet pressure, then measurement precision is improved for pressure threshold detection, but device complexity increases due to additional moving parts
Solution Approach 1:
The sensing function is extracted from a complex electronic pressure sensing system and implemented through a simple mechanical piston-diskspring mechanism. The sensing piston directly responds to inlet pressure changes and mechanically actuates the bypass valve, eliminating the need for electronic sensors, signal processing circuits, and associated control systems while maintaining precise pressure threshold detection capability.
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 mechanical bypass valve ensures reliable operation independent of electrical failures, the finned coolant bowl prevents hydrocarbon condensation, and the balance valve stabilizes pressure, enhancing the overall performance and reliability of CNG flow regulators.
Implementation Method 1
a movable sensing piston biased by a control spring
Implementation Method 2
a finned coolant bowl for enhanced cooling
Implementation Method 3
a balance valve to stabilize pressure variations
Data Source
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AI summary
A flow regulator for a compressed natural gas (CNG) system is defined by a housing having at least one inlet port, at least one outlet port and at least one interior passage fluidically interconnecting the inlet and outlet ports. A mechanical bypass valve is disposed between the inlet and outlet ports and enabled by a movable biased feature which moves based on inlet pressure and in which the bypass valve is closed only after inlet pressure is greater than a predetermined threshold. The bypass valve is a fail safe wherein gas regulation does not occur until the inlet pressure is sufficient to close the bypass valve. The flow regulator further includes a coolant bowl defined by a serpentine channel formed in a coolant plate as well as a balanced valve as a regulator control feature in conjunction with a weighting or loading mechanism having a diaphragm.