Piezoelectric Valve Pre-Pulse Stabilization
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Solution Overview
Problem
Conventional piezoelectric valves experience vibration and instability in long gas ejection times, leading to variable air flow and reduced responsivity during valve opening, while also being expensive due to complex circuit configurations.
Innovation Solution
A piezoelectric valve with a driving unit that generates a pre-pulse and main pulse signal to control the piezoelectric element's expansion and compression, stabilizing gas flow and improving responsivity, and featuring a simple circuit configuration for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a piezoelectric element is used to quickly open and close the valve with high responsivity, then the valve can precisely blow off defective grains, but the valve body vibrates during long gas ejection and the amount of air ejected changes
Solution Approach 1:
The patent applies a pre-pulse voltage before the main drive pulse to preliminarily expand the piezoelectric element, positioning the valve body in an optimal starting position that prevents vibration during subsequent long-duration gas ejection. This preliminary action prepares the system to maintain stability throughout the ejection process.
Solution Approach 2:
The patent uses a two-stage periodic voltage application (pre-pulse followed by main pulse) to control the piezoelectric element. The pre-pulse creates a preliminary expansion phase, and the main pulse provides the primary actuation, together forming a periodic control sequence that ensures both rapid response and stable operation.
2Stability of the object's composition
If a two-level driving voltage is applied to prevent valve body vibration and stabilize gas ejection, then gas can be stably supplied for long time, but the responsivity at valve opening becomes significantly lower
Solution Approach 1:
The patent employs a two-stage periodic voltage signal where a pre-pulse is applied first to preliminarily expand the piezoelectric element, followed by a main pulse that provides the full expansion force. This periodic action sequence maintains high responsivity during opening while preventing vibration during sustained operation.
Solution Approach 2:
The pre-pulse voltage serves as a preliminary action that positions the piezoelectric element and valve body in an optimal state before the main actuation. This preliminary positioning enables both rapid response and stable long-duration gas ejection without sacrificing opening speed.
3Length of moving object
If a displacement enlarging mechanism is used to amplify the piezoelectric element's displacement, then the valve opens and closes more effectively, but the valve body vibrates during long gas ejection
Solution Approach 1:
The displacement enlarging mechanism is activated by a pre-pulse voltage that preliminarily expands the piezoelectric element, positioning the valve body in an optimal starting position. This preliminary action through the mechanical amplification mechanism prevents vibration during subsequent long-duration gas ejection while maintaining effective valve opening.
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 solution provides stable gas supply and high responsivity during valve opening, ensuring reliable air ejection for long durations while reducing costs by simplifying the circuit configuration.
Implementation Method 1
a piezoelectric element configured to produce a driving force required to move the valve body as a displacement
Data Source
AI summary
A piezoelectric valve stably supplies gas even for a long gas ejection time, with a high responsivity to opening the valve, is provided. The piezoelectric valve, including a gas-pressure-chamber for receiving a compressed gas supplied from outside, a gas-discharge-channel through which the compressed gas is discharged from the gas-pressure-chamber, comprises: a valve body disposed in the gas-pressure-chamber and opens/closes the gas-discharge-channel; a piezoelectric element for producing a driving force to move the valve body as a displacement; a displacement-enlarging-mechanism for enlarging the displacement of the piezoelectric element to act on the valve body; and a driving unit having a signal-generating-unit for generating a signal comprising a pre-pulse and a main pulse and provides the signal generated by the signal-generating-unit to a driving circuit as an input signal to apply a driving voltage to the piezoelectric element to make the piezoelectric element expand and drive the valve body open.