Well Pump Multi-Float Check Valves for Landfill Leachate
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Solution Overview
Problem
Well pumps in landfills face frequent failures due to contamination and operational challenges in corrosive, particulate-filled environments, particularly with air-operated pumps that use dual-purpose air supply and exhaust lines, leading to unreliable performance.
Innovation Solution
A multi-float control assembly is integrated into the pump, featuring a bottom float check valve connected to a discharge tube and an upper float check valve connected to a vent, allowing independent on/off operation and preventing contamination by using compressed air to manage fluid levels and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dual-purpose air supply and exhaust lines are used in air-operated pumps, then device complexity is reduced, but contamination occurs leading to unreliable operation
Solution Approach 1:
The patent divides the air handling system into separate functions: a dedicated exhaust line separates contaminated exhaust air from the compressed air supply line. This segmentation prevents contamination of the supply system while maintaining relatively simple overall device structure.
Solution Approach 2:
The exhaust function is extracted from the supply line by providing a separate exhaust line that vents contaminated air directly to the atmosphere. This removes the harmful exhaust pathway from the clean supply pathway, eliminating contamination while adding minimal complexity.
2Ease of operation
If intricate floats, linkages and valving are used for automatic pump operation, then ease of operation is improved, but device complexity increases and reliability decreases in corrosive environments
Solution Approach 1:
The pump chamber itself performs the sensing function through its interaction with the float mechanism. The float rises with leachate level and automatically triggers discharge when the chamber is full, creating a self-regulating system that requires no external controllers or complex timing circuits.
Solution Approach 2:
The patent uses pneumatic actuation through compressed air to drive the discharge mechanism. The air supply line delivers compressed air that automatically discharges contents when activated by the float mechanism, replacing complex mechanical linkages with simpler pneumatic control.
3Ease of manufacture
If commercial off the shelf air valves are used in contaminated environments, then ease of manufacture is improved, but reliability deteriorates due to contamination
Solution Approach 1:
The patent extracts the valve from the contaminated environment by positioning it on the clean compressed air supply line rather than in the exhaust pathway. This allows use of standard commercial valves that are not exposed to corrosive leachate contamination, maintaining ease of manufacture while improving reliability.
Solution Approach 2:
The separate exhaust line acts as an intermediary that isolates the valve and supply system from contaminated exhaust air. This intermediary pathway protects critical components from harmful exposure while allowing standard commercial components to be used.
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 multi-float control assembly ensures reliable operation by preventing contamination and maintaining pump integrity, allowing for efficient fluid removal and methane extraction while reducing maintenance needs.
Implementation Method 1
a bottom float check valve operably connected to the discharge tube by the coupling
Implementation Method 2
an upper float check valve connected to a vent
Implementation Method 3
moving to a normally off state by using compressed air to unseat the float of the upper check valve and fill the cavity with compressed air; and discharging the fluid through the discharge tube
Data Source
AI summary
A pump is disclosed. The pump including an outer casing having a cavity therein; a pump assembly positioned in the cavity of the outer casing, the pump assembly including: a discharge tube; a check valve operably connected to the discharge tube by a coupling; and a multi-float control assembly, the multi float control assembly including a bottom float check valve operably connected to the discharge tube by the coupling and an upper float check valve connected to a vent.