Magnetically Damped Check Valve for Poppet Chatter Control
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Solution Overview
Problem
Existing check valves experience instability and rapid oscillations, known as 'chatter,' due to rapidly changing differential pressures, leading to accelerated wear and damage, and previous damping methods like frictional and fluidic dampers are inconsistent or wear out components.
Innovation Solution
A magnetically damped check valve design featuring a non-magnetic metal sleeve and a poppet assembly with a magnet that induces an opposing magnetic field as it moves, damping the poppet's motion through Eddy currents, thereby reducing instability and chatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a spring-mass system is used to control poppet movement, then the valve can respond to differential pressure changes, but the system becomes unstable and exhibits harmonic oscillation causing check valve chatter
Solution Approach 1:
The patent replaces the mechanical spring-mass system with a magnetic field-based damping system. A magnet attached to the poppet shaft interacts with a non-magnetic metal sleeve to generate eddy currents that provide damping force, substituting mechanical elasticity with electromagnetic effects to achieve stable response without oscillation
Solution Approach 2:
The non-magnetic metal sleeve acts as an intermediary between the magnet and the external environment. It allows the magnetic field to penetrate and interact with the magnet while providing a path for eddy current generation, mediating the damping effect without direct mechanical contact
2Stability of the object's composition
If frictional dampers are used to reduce chatter, then oscillation is dampened, but components wear out and operating characteristics become inconsistent
Solution Approach 1:
The patent substitutes frictional mechanical damping with electromagnetic damping. The magnetic field induces eddy currents in the non-magnetic metal sleeve, creating a non-contact damping force that eliminates wear and maintains consistent operating characteristics across temperature and time variations
Solution Approach 2:
The magnetic field serves as an intermediary that transmits damping force without physical contact. The field interacts with the magnet through the non-magnetic sleeve, providing consistent damping forces that do not degrade over time or with temperature changes
3Stability of the object's composition
If fluidic dampers are used to effect damping, then chatter is reduced, but operation becomes inconsistent with changes in fluid properties
Solution Approach 1:
The patent replaces fluidic damping with electromagnetic damping. The magnetic field-based eddy current mechanism provides damping forces that are independent of fluid properties such as density and viscosity, ensuring consistent operation across varying fluid conditions
Solution Approach 2:
The magnetic field acts as an intermediary that provides damping forces independent of the fluid medium. The non-magnetic metal sleeve enables this magnetic interaction while being transparent to fluid flow, decoupling the damping mechanism from fluid property variations
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 magnetic damping effectively stabilizes the poppet's movement, reducing wear and extending the lifespan of components, while maintaining consistent operation across varying fluid conditions without relying on fluid properties or causing wear.
Implementation Method 1
The magnet produces a first magnetic field that changes as the magnet moves within the interior region of the sleeve. The changes in the first magnetic field induce an electrical current in the sleeve which produces a second magnetic field that opposes the first magnetic field
Implementation Method 2
The changes in the first magnetic field induce an electrical current in the sleeve which produces a second magnetic field that opposes the first magnetic field thereby damping the movement of the magnet
Data Source
AI summary
A magnetically damped check valve having a non-magnetic metal sleeve and a spring-biased poppet disposed within the check valve. The spring-biased poppet is operably supported by the sleeve. A poppet guide is attached to the sleeve. The poppet includes a shaft that is slidably attached to the poppet guide. A portion of the shaft extends into the sleeve. At least one magnet is attached to the portion of the shaft that extends into the sleeve. The magnet therefore moves with the shaft as the poppet moves in response to changes in differential pressure across the check valve. The magnet produces a magnetic field. As the magnet moves within the sleeve, the magnetic field changes thereby inducing an electrical current in the sleeve which produces another magnetic field that opposes the magnetic field of the magnet thereby damping the movement of the magnet and hence, damping the movement of the poppet.