Capacitive Sensor for Sump Pump Level Control
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Solution Overview
Problem
Conventional sump pump switching mechanisms, including mechanical, resistance, capacitance, and magnetic types, are prone to mechanical failure, corrosion, and reliability issues due to exposed electrodes or multiple components, which affects their accuracy and longevity.
Innovation Solution
A capacitive sensor system using a variable capacitor with insulative and liquid dielectric materials, where the changing liquid level affects capacitance readings, allowing for accurate liquid level detection without moving parts or exposed electrodes, and a single capacitor design reduces component failure risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical float switch mechanisms are used, then liquid level control function is achieved, but mechanical failure occurs due to deterioration of mechanical connection or obstruction by objects
Solution Approach 1:
The patent replaces the mechanical float switch mechanism with a capacitive sensing system. Instead of using mechanical connections between float and switch, the invention uses electrical capacitance changes detected by electrodes to sense liquid level. This eliminates mechanical wear, deterioration, and obstruction problems while maintaining the liquid level control function.
Solution Approach 2:
The patent introduces an intermediary capacitive sensing system between the liquid and the control mechanism. Rather than direct mechanical contact, the system uses capacitance changes caused by liquid proximity to trigger pump control, eliminating the need for mechanical connections that are prone to failure.
2Measurement precision
If resistance switching mechanism with exposed electrodes is used, then liquid level detection is achieved, but electrode corrosion occurs leading to inaccurate resistance readings
Solution Approach 1:
The patent replaces the resistance-based switching mechanism with a capacitive sensing system. Instead of measuring electrical resistance through exposed electrodes, the invention measures capacitance changes caused by liquid proximity. This eliminates electrode corrosion while maintaining accurate liquid level detection.
Solution Approach 2:
The patent changes the measurement parameter from electrical resistance to electrical capacitance. By measuring capacitance rather than resistance, the system avoids the corrosion problem that affects resistance-based electrodes, since capacitive sensing can be performed with non-contact or minimally exposed electrodes.
3Reliability
If multiple capacitors are used in capacitance switching mechanism, then liquid level control is achieved, but system reliability decreases due to potential failure of individual capacitors
Solution Approach 1:
The patent merges multiple capacitor functions into a single capacitive sensing system. Instead of using separate upper and lower capacitors that can fail independently, the invention uses one capacitive sensor with a single output signal that provides all necessary control information, eliminating component failure risks while maintaining control functionality.
Solution Approach 2:
The patent makes a single capacitive sensor perform multiple functions that previously required separate components. The single sensor provides both upper and lower level detection capabilities through its output characteristics, eliminating the need for multiple capacitors and reducing system failure points.
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 capacitive sensor system provides reliable and accurate liquid level control for sump pumps, reducing mechanical and corrosion-related failures, and simplifies assembly and maintenance, while being cost-effective by eliminating the need for multiple components.
Implementation Method 1
a variable capacitor having first and second electrodes and a dielectric connecting the first and second electrodes to form a capacitor having a readable capacitance. The dielectric includes a first part made of an insulative material and a second part made of a liquid that changes levels with respect to the insulative material which causes a change in the capacitance of the capacitor
Implementation Method 2
The dielectric includes a first part made of an insulative material and a second part made of a liquid that changes levels with respect to the insulative material
Data Source
AI summary
A variable capacitor for sensing the level of a liquid. The capacitor provides a readable capacitance that varies with respect to the level of the liquid. A pump control system implementing the capacitive sensor to control the level of a liquid by activating and deactivating the pump depending on the level of the liquid. Methods relating to varying capacitance of a capacitive sensor and controlling a pump based on the level of a liquid. A pump controller for controlling the level of a liquid in a reservoir includes a controller and a capacitor. The capacitor is adapted to provide an activation signal to the controller when the liquid in the reservoir reaches a first predetermined level relative thereto. Additionally, the capacitor is adapted to provide a trigger signal to the controller when the liquid in the reservoir reaches a second predetermined level relative thereto. Based on the trigger signal, the controller determines when to deactivate the pump.