Diaphragm Pump Leak Compensation Shutter Mechanism
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Solution Overview
Problem
Diaphragm pumps face issues with reduced suction power due to the need for the compensation valve to overcome a spring force, limiting suction capacity and leading to cavitation and overcompensation, especially when operating at reduced pressures.
Innovation Solution
A diaphragm pump design where the compensation shutter is driven by the diaphragm's return force from a suction-assistance spring, eliminating the need to overcome the force holding it closed, allowing for increased suction capacity and improved operation by maintaining pressure differences between the hydraulic control and working chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is used to hold the compensation valve closed, then the valve can be reliably closed to prevent overcompensation, but the diaphragm must overcome the spring force to open the valve during suction, limiting suction capacity
Solution Approach 1:
The patent removes the spring force requirement from the valve opening process. The compensation shutter is opened by the diaphragm's direct mechanical action on the shutter rod, eliminating the need for the diaphragm to overcome spring force. This extraction of the spring force constraint allows the pump to achieve higher suction capacities while maintaining reliable valve closure through the spring's continued presence.
2Productivity
If the spring force is reduced to improve suction power, then the diaphragm can overcome the force more easily, but the valve may not close reliably to prevent overcompensation
Solution Approach 1:
The patent separates the functions of valve closure and valve opening. The spring continues to provide reliable closing force, while the diaphragm's mechanical action on the shutter rod provides the opening action without needing to overcome spring force. This segmentation of functions allows both reliable closure and high suction power to coexist.
3Reliability
If a rated check valve is used to refill the chamber, then the pump can compensate for leaks, but the valve may open prematurely due to suction peaks, causing overcompensation
Solution Approach 1:
The patent uses the diaphragm's position itself as the triggering mechanism for opening the compensation shutter. The shutter opens automatically when the diaphragm reaches the end of its suction stroke, eliminating the need for separate rated check valves that are susceptible to premature opening from suction peaks. This preliminary action based on diaphragm position ensures precise timing and prevents overcompensation.
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 suction power by up to 10 meters of water column, reduces degassing, and eliminates the need for a separate valve return spring, improving pump efficiency and reducing operational penalties.
Implementation Method 1
the diaphragm being subjected to the return force of a suction-assistance spring that co-operates with the above-mentioned shutter in order to return it to its closed state
Implementation Method 2
maintaining pressure differences between the hydraulic control and working chambers
Data Source
AI summary
A diaphragm pump including, in a pump body, a hydraulic control chamber disposed between a piston for executing reciprocating motion and the diaphragm, the pump including elements for compensating leaks from the hydraulic chamber, the elements including a refilling duct opening out into the hydraulic chamber via a normally-closed compensation shutter that is driven into the open position by the diaphragm, wherein the above-mentioned compensation shutter being driven by the diaphragm pressing against a free end of a rod for controlling the shutter, the diaphragm being subjected to the force of a suction-assistance spring which co-operates with the above-mentioned shutter to return it to its closed position by pushing the free end of the control rod back towards the diaphragm, the spring co-operating with the shutter to form a moving assembly that is moved without being deformed by the diaphragm during suction overtravel.