Pneumatic Control Device for Vacuum Maintenance During Power Failure
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Solution Overview
Problem
Existing vacuum ejector systems face issues with maintaining negative pressure during power outages and leaks, leading to object drop and excessive compressed air consumption, particularly due to the reliance on monostable valves and additional energy sources for regulation.
Innovation Solution
A control device comprising a normally closed monostable valve and a bistable directional valve, controlled by an electronic circuit with two units, allows for maintaining vacuum and regulating air supply, ensuring continuous operation even during power failures by switching between states to prevent vacuum loss and re-establish suction as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a monostable valve is used to control compressed air supply to the ejector, then the system is simple and cost-effective, but the vacuum cannot be maintained during power outages or leaks
Solution Approach 1:
A capacitor is introduced as an intermediary energy storage device between the power supply and the monostable valve. The capacitor stores electrical energy during normal operation and releases it during power outages or leaks, enabling the valve to maintain its open state and thus preserving vacuum without requiring continuous power supply.
Solution Approach 2:
The capacitor is charged in advance during normal operation to provide energy reserves. This beforehand energy accumulation acts as a cushion that sustains the valve operation during unexpected power failures or system leaks, preventing vacuum loss before it can occur.
2Reliability
If compressed air supply is maintained throughout the entire gripping time, then the object can be reliably gripped, but compressed air consumption becomes excessive
Solution Approach 1:
The system transitions from continuous compressed air supply to periodic supply. The monostable valve remains open during gripping to maintain vacuum, then automatically closes when the object is released, allowing the system to operate periodically rather than continuously, thereby reducing energy consumption while maintaining gripping reliability.
Solution Approach 2:
A pressure sensor provides feedback on the vacuum level to the control circuit. Based on this feedback, the control circuit intelligently manages the monostable valve timing, ensuring the valve opens when gripping is needed and closes when it is not, optimizing compressed air consumption while maintaining reliable object handling.
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 effectively maintains negative pressure and reduces compressed air consumption by automatically regulating the vacuum, preventing object drop during power outages and leaks, and eliminating the need for additional energy sources, thus enhancing the reliability and efficiency of vacuum ejector systems.
Implementation Method 1
a bistable directional valve having both a first port for connecting to the compressed air source and also a second port connected to a first port of a normally passing monostable directional valve
Implementation Method 2
the monostable directional valve having a second port connected to a pneumatic control port of the monostable valve
Implementation Method 3
an ejector comprises a duct including a Venturi type nozzle having: an inlet orifice for connecting to a compressed air supply circuit; an outlet orifice for a jet of air accelerated by the nozzle; and a suction orifice arranged between the inlet orifice and the outlet orifice
Data Source
AI summary
A control device for controlling a pneumatic component includes a compressed air supply circuit for connecting to an inlet of the pneumatic component. The circuit includes a normally closed monostable valve having an inlet for connecting to a compressed air source and an outlet for connecting to the pneumatic component, and a bistable directional valve having both a first port for connecting to the compressed air source and also a second port connected to a first port of a normally passing monostable directional valve, the monostable directional valve having a second port connected to a pneumatic control port of the monostable valve.