Integrated Diaphragm Pump Valve Structure for Vacuum Performance
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Solution Overview
Problem
Diaphragm pumps face limitations in achieving low final pressures and high pumping speeds due to dead volume and structural complexity, leading to inferior performance compared to scroll pumps, especially in the 1 to 10 mbar intake pressure range.
Innovation Solution
Integration of the inlet valve, outlet valve, and membrane into a single coherent component, with positive control via an actuator and a crank mechanism, reduces backflow and dead volume, simplifying the structure and increasing pumping speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inlet valve, outlet valve, and membrane are integrated into a single coherent component, then the structure is simplified and maintenance effort is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent merges the inlet valve, outlet valve, and membrane into a single coherent component that moves as one unit. This integration eliminates the need for separate valve assemblies and reduces the number of moving parts, directly simplifying the overall pump structure while maintaining functional separation through the coherent component's design.
Solution Approach 2:
The coherent component performs multiple functions simultaneously: it acts as the membrane for volume change, contains the inlet and outlet valves, and provides the sealing surfaces. This multi-functionality reduces the number of separate components needed, simplifying the device while consolidating manufacturing precision requirements into a single integrated unit.
2Productivity
If the coherent component is positively controlled via an actuator, then backflow is reduced and pumping speed increases, but the device complexity increases
Solution Approach 1:
The actuator serves as an intermediary that converts rotational motion into the linear reciprocating motion required to control the coherent component. This intermediary mechanism enables precise positive control of the valves and membrane, preventing backflow and enhancing pumping speed without requiring complex direct drive mechanisms.
Solution Approach 2:
The patent replaces traditional mechanical valve control mechanisms with an actuator-based system that provides positive control. This substitution allows for more precise timing and control of valve operations, improving pumping efficiency while using a standardized actuator component rather than complex mechanical linkages.
3Productivity
If a crank mechanism is used to actuate the coherent component, then the pumping speed and compression ratio are improved, but the device complexity increases
Solution Approach 1:
The crank mechanism converts continuous rotational motion into periodic reciprocating motion of the coherent component. This periodic action creates the necessary suction and compression phases, enabling high pumping speeds and effective compression ratios while using a well-established mechanical principle that balances complexity with performance.
Solution Approach 2:
The crank mechanism introduces dynamic motion control, allowing the coherent component to accelerate and decelerate during its cycle. This dynamic actuation optimizes the timing of valve opening and closing, improving compression efficiency and pumping speed while using a compact mechanical arrangement.
4Volume of moving object
If the connecting rod is coupled via a crosshead, then linear movement is achieved and dead volume is reduced, but the manufacturing complexity increases
Solution Approach 1:
Instead of allowing angular motion to be directly transmitted to the coherent component, the patent inverts the approach by using a crosshead to convert the connecting rod's motion into purely linear reciprocating motion. This inversion ensures that the coherent component moves in a straight line, minimizing dead volume while the crosshead's simple geometry facilitates straightforward manufacturing and assembly.
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 configuration enhances the achievable ultimate vacuum and reduces maintenance and production costs while improving pumping speed and final pressure performance.
Implementation Method 1
at least the section of the connected component that encompasses the membrane can be acted upon by a crank mechanism
Implementation Method 2
The suction chamber is pressurized via the membrane in such a way that the relevant medium is sucked through the inlet valve into the suction chamber in a suction phase and is expelled from the suction chamber
Data Source
Figure 1
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AI summary
A diaphragm pump, particularly a diaphragm vacuum pump, comprises a pumping chamber actuated by a diaphragm, an inlet valve, and an outlet valve. A medium is drawn into the pumping chamber during a suction phase and expelled from the pumping chamber during a compression phase. The inlet valve, the outlet valve, and the diaphragm are integrated into a single, cohesive component.