Gas Drive Control Valve for Supercritical Exhaust Throttling
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Solution Overview
Problem
Conventional gas-powered drive systems with exhaust air throttling are not energetically favorable, as the driving chamber is always under maximum gas pressure, leading to inefficient energy use and load-dependent movement of the work element.
Innovation Solution
A control valve is introduced in the driving chamber, which adjusts its opening cross-section based on the control pressure upstream from the exhaust air throttle, allowing for supercritical flow and efficient pressure regulation to maintain desired pressure levels, reducing energy consumption and achieving load-independent movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exhaust air throttling is used to maintain supercritical flow, then load-independent movement of the work element is achieved, but energy efficiency deteriorates due to maximum gas pressure in the driving chamber
Solution Approach 1:
The control valve dynamically adjusts the opening cross-section based on the control pressure from the counteracting chamber, transitioning from a static fixed-opening system to a dynamic adaptive system that optimizes energy efficiency while maintaining load-independent movement
Solution Approach 2:
The system changes the opening cross-section parameter of the control valve in response to pressure changes in the counteracting chamber, allowing the driving chamber pressure to vary below maximum levels while still achieving supercritical flow through the exhaust air throttle
2Use of energy by moving object
If the opening cross-section of the control valve is increased to allow more gas flow, then energy efficiency improves, but the control pressure drops below the level needed for supercritical flow
Solution Approach 1:
The control pressure from the counteracting chamber serves as feedback that automatically regulates the control valve opening, creating a self-adjusting system that maintains supercritical flow conditions while optimizing energy efficiency
Solution Approach 2:
The system uses its own internal pressure dynamics to automatically control the valve opening, where the control pressure from the counteracting chamber directly regulates the control valve without requiring external control systems
3Force
If the driving chamber is maintained at maximum gas pressure, then force output is maximized, but energy consumption increases and movement becomes load-dependent
Solution Approach 1:
The control valve provides dynamic pressure regulation in the driving chamber, allowing pressure to adjust according to load conditions rather than maintaining constant maximum pressure, thereby reducing energy consumption while preserving adequate force output
Solution Approach 2:
The driving chamber pressure parameter is allowed to vary below maximum levels through control valve regulation, changing from a constant maximum pressure system to a variable pressure system that reduces energy consumption while maintaining sufficient force
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 enables a more energetically favorable operating mode with supercritical flow in the exhaust air throttle, ensuring efficient and load-independent movement of the work element by regulating pressure and reducing energy consumption.
Implementation Method 1
the exhaust air throttle is preferably set, in particular with respect to the pressure dropping across the exhaust air throttle, so that a so-called supercritical flow of the gas through the exhaust air throttle results... In the case of supercritical flow, the flow velocity reaches the speed of sound
Implementation Method 2
A control valve is introduced in the driving chamber, which adjusts its opening cross-section based on the control pressure upstream from the exhaust air throttle, allowing for supercritical flow and efficient pressure regulation to maintain desired pressure levels
Implementation Method 3
the gas escaping through the exhaust air throttle preferably also flows through a check valve that opens in the direction toward the gas sink. This has the advantage that the gas cannot/does not need to flow through the exhaust air throttle in a return stroke of the work element, but can be guided past the exhaust air throttle in parallel therewith
Data Source
AI summary
A gas-powered drive system has a drive which includes a first chamber and a second chamber which are separated from one another by a piston. One of the chambers is connected to a gas source to drive the work element and the other chamber is connected via an exhaust air throttle to a gas sink by means of a reversing valve to movement of the piston. A control valve is assigned to the driving chamber through which the driving chamber can be filled with gas from the gas source. The opening cross-section of the control valve is set as a function of a control pressure.