Pneumatic Booster Valve with Independent Gain Control
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Solution Overview
Problem
Pneumatic booster valves in actuation systems suffer from dynamic instability and reduced performance due to increased active elements, leading to delays in piston positioning and reduced dynamic performance, as the number of active elements increases, necessitating a more efficient design.
Innovation Solution
The booster valve features independent gain control devices for charge and discharge, allowing for separate control of amplification without influencing each other, with preloading and stiffness of contrast springs optimizing dynamic behavior and increasing the flow coefficient to approximately 20 GPM/psi, while maintaining independent sealing strengths between shutters and seats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If booster valves are added to increase air flow rate, then the actuation speed is improved, but the dynamic stability deteriorates due to increased phase lag
Solution Approach 1:
The booster valve is segmented into two independent functional units: a charge amplifier unit with charge shutter and contrast spring, and a discharge amplifier unit with discharge shutter and contrast spring. This segmentation allows independent control of charge and discharge operations, eliminating the phase lag that occurs in conventional single-unit boosters where charge and discharge operations interfere with each other. The independent units can operate simultaneously without mutual interference, maintaining dynamic stability while achieving high actuation speed.
Solution Approach 2:
The invention introduces adjustable gain control devices that dynamically modify the amplification factor of the booster valve. The gain control devices include adjustable orifices that can be tuned to optimize the balance between charge and discharge flow rates. This dynamic adjustment capability allows the system to adapt to different operating conditions, maintaining optimal performance across varying pressure and flow rate requirements while preserving dynamic stability.
2Productivity
If the number of active elements is increased to achieve higher flow coefficient, then the air flow rate is improved, but the phase lag increases causing overstepping
Solution Approach 1:
By dividing the booster valve into separate charge and discharge amplifier units, each unit can be optimized independently for its specific function. The charge shutter and discharge shutter operate in parallel rather than sequence, eliminating the cumulative phase lag that would result from multiple active elements operating in series. This segmentation achieves high flow coefficient without the time penalties of sequential operations.
Solution Approach 2:
The invention introduces gain control devices as intermediary elements that regulate the amplification process. These intermediaries (adjustable orifices and flow control mechanisms) fine-tune the pressure differential across the shutters, optimizing the response time and reducing phase lag. The intermediary elements act as buffers that smooth out pressure fluctuations, preventing the oscillations and overstepping that would otherwise occur with high-gain amplification.
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
This design enhances dynamic capacity and flow efficiency, reducing phase lag and improving the time to reach desired positions, while maintaining sealing integrity and reducing the number of contact points between moving parts.
Implementation Method 1
with preloading and stiffness of contrast springs optimizing dynamic behavior
Implementation Method 2
The actuation is activated when such pressure variation exceeds a determined value
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Booster valve (4) for pneumatic circuits, comprising: a hollow body (5), a pilot flow inlet/outlet gap (15) communicating directly with a control volume (16), an inlet/outlet gap (45) communicating with an actuator and communicating directly with an accumulation volume (29), a supplying gap (53) communicating directly with a supplying volume (38), a discharge gap (44), an amplified discharge shutter (25) which determines the sealing towards the discharge gap (44), a central device (43) comprising an amplified charge shutter (32) which determines the sealing towards the supplying gap (53), an activation piston (22) which, subjected to the pressure acting in the accumulation volume (29) and in the control volume (16), determines the movement of the amplified discharge shutter (25) or the amplified charge shutter, and having two separated and independent charge (47) and discharge (46) gain control devices which allow an independent adjustment between the charge and the discharge step and vice versa, and the central device (43) comprising a plurality of stakes (33), which, in combination with the passage sections determined by the opening of the amplified discharge shutter (25) and the amplified charge shutter (32) determine the flow amplification in discharge and charge steps.