Gas Valve Closing Control With Pulsed Electromagnetic Braking
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Solution Overview
Problem
Electromagnetically controlled gas valves experience strong closing rebounds due to lack of hydraulic damping, leading to seat wear, noise, and potential reopening of the valve.
Innovation Solution
A method involving the application of a pulsating braking current to the solenoid coil during the closing process, which decelerates the armature and reduces impact speed, thereby dampening the closing process and preventing rebounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solenoid coil is supplied with current to open the gas valve, then the valve member is lifted out of the seal seat, but strong closing rebounds occur due to lack of hydraulic damping
Solution Approach 1:
The patent replaces the mechanical hydraulic damping system with an electromagnetic braking system. By applying a braking current to the solenoid coil during the closing process, the magnetic field generates a braking force that dampens the armature's movement and reduces closing rebounds, eliminating the need for hydraulic damping components.
Solution Approach 2:
The patent changes the electrical parameter (current supply) of the solenoid coil dynamically during the closing process. By adjusting the current level or pulse width timing, the magnetic field strength is modified to provide optimal braking effect, reducing the armature's impact speed and preventing closing rebounds while maintaining reliable valve operation.
2Productivity
If the armature moves quickly to close the valve, then the response time is reduced, but the impact impulse at the stop increases causing seat wear and noise
Solution Approach 1:
The patent applies preliminary braking action by supplying a braking current to the solenoid coil before the armature reaches its final stop position. This preliminary electromagnetic braking reduces the armature's speed in advance, preventing excessive impact impulse at the stop while maintaining the overall fast response time of the valve closing operation.
Solution Approach 2:
The patent replaces mechanical shock absorption mechanisms with an electromagnetic braking system. The controlled application of braking current creates a magnetic field that opposes the armature's motion, smoothly decelerating it before impact and eliminating the need for mechanical dampers or cushioning elements.
3Reliability
If a continuous current is supplied to the solenoid coil, then the armature is continuously acted upon by magnetic force, but the braking effect is reduced when the armature reverses direction due to closing rebounds
Solution Approach 1:
The patent employs periodic or pulsed current supply to the solenoid coil during the closing process rather than continuous current. The braking current is applied in controlled pulses that coincide with the armature's movement toward the stop, creating effective braking during the critical phase while avoiding acceleration during rebound movements, thereby improving overall braking effectiveness.
Solution Approach 2:
The patent implements feedback control by monitoring the armature's position or movement state and adjusting the braking current accordingly. When the armature approaches the stop position, the braking current is increased to maximize deceleration. When the armature reverses direction due to rebound, the current supply is reduced or interrupted, preventing further acceleration and enhancing braking effectiveness.
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 method effectively reduces the impact impulse at the stop, increases the robustness of the gas valve, and prevents reopening due to closing rebounds, while also allowing for accurate closing time recognition.
Implementation Method 1
a solenoid coil acting on an armature is supplied with current so that a valve member interacting with the seal seat is lifted out of the seal seat by the armature
Implementation Method 2
a braking current is applied to the solenoid coil during the closing and, depending on the direction of movement of the armature, the current supply to the solenoid coil is interrupted and/or the current level is varied. The applied braking current decelerates the movement of the armature
Implementation Method 3
the current supply to the solenoid coil is terminated so that the valve member is returned into the seal seat by the spring force of a closing spring
Data Source
AI summary
A method for controlling an electromagnetically controllable gas valve. In order to open a seal seat, a solenoid coil acting on an armature is supplied with current so that a valve member interacting with the seal seat is lifted out of the seal seat by the armature and, in order to close the seal seat, the current supply to the solenoid coil is terminated so that the valve member is returned into the seal seat by the spring force of a closing spring, wherein the return of the valve member into the seal seat causes the armature to disengage from the valve member and perform a free stroke. A braking current is applied to the solenoid coil during the closing and, depending on the direction of movement of the armature, the current supply to the solenoid coil is interrupted and/or the current level is varied. A control device is also described.