Diaphragm Pump Position Control via Feedback Valve
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Solution Overview
Problem
Hydraulically driven diaphragm pumps face issues with the diaphragm moving beyond the pressure stroke position due to bypass flow around the piston, leading to potential perforation or reduced delivery volume, and existing solutions are complex and prone to faults.
Innovation Solution
The diaphragm is coupled with a closing element that opens the valve when it moves beyond the pressure stroke position, allowing hydraulic fluid to escape into the storage chamber, reducing pressure and preventing further movement, and a resilient biasing mechanism ensures the diaphragm returns to the pressure stroke position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a moving piston is used to apply oscillating pressure to the hydraulic fluid, then the pumping action is achieved, but bypass flow around the piston causes the diaphragm to move beyond the pressure stroke position or reduces delivery volume
Solution Approach 1:
The valve closing element is mechanically coupled to the diaphragm, creating a feedback mechanism where the diaphragm's position directly controls the valve state. When the diaphragm reaches the pressure stroke position, it actuates the closing element to open the valve, allowing hydraulic fluid to escape from the working chamber, which then causes the diaphragm to return. This feedback loop ensures precise position control and prevents over-stroking.
Solution Approach 2:
The system uses the diaphragm's own movement to control the valve timing and hydraulic fluid release. The diaphragm mechanically actuates the valve closing element through its oscillating motion, creating a self-regulating system that automatically prevents over-stroking without requiring external control mechanisms.
2Reliability
If complex control mechanisms are added to prevent diaphragm over-stroking, then position control is improved, but device complexity increases and fault susceptibility increases
Solution Approach 1:
The valve closing element is integrated with the diaphragm assembly through mechanical coupling, combining the diaphragm's pumping function with the valve control function into a single unified structure. This eliminates the need for separate control mechanisms and reduces overall system complexity while maintaining reliable position control.
Solution Approach 2:
The valve closing element serves multiple functions: it controls the valve timing, provides mechanical coupling between the diaphragm and valve system, and acts as a position sensor. This multi-functionality reduces the number of separate components needed and simplifies the overall device structure.
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 solution prevents the diaphragm from moving excessively beyond the pressure stroke position, ensuring reliable operation and maintaining the diaphragm's integrity, while also providing a mechanism for fluid refill and pressure relief.
Implementation Method 1
The diaphragm can be resiliently biased in the direction of the suction stroke position
Implementation Method 2
a working chamber which is filled with a hydraulic fluid, a device for applying an oscillating pressure p1 to the hydraulic fluid
Implementation Method 3
the diaphragm is coupled to the closing portion in such a way that upon a movement of the diaphragm from the pressure stroke position into a position which is further away from the suction stroke position the valve is opened
Data Source
AI summary
A diaphragm pump includes a pumping chamber, suction and pressure connections, a working chamber filled with a hydraulic fluid, a device for applying an oscillating pressure P1 to the hydraulic fluid, and a diaphragm separating the pumping chamber and the working chamber moveable between a pressure stroke position and a suction stroke position. A storage chamber accommodates hydraulic fluid at a pressure P2. The storage chamber and the working chamber are connected to each other by a valve having a closing part. The diaphragm cannot move too far beyond the pressure stroke position. The diaphragm is coupled to the closing part so that the valve is opened when the diaphragm moves from the pressure stroke position to a position that is farther from the suction stroke position than the pressure stroke position.