Capacitance-Based Immersion Detection for Pool Cleaners
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Solution Overview
Problem
Existing swimming pool cleaning devices face challenges with leaching water detection methods, including high costs, mechanical failures, electrode electrolysis, and misjudgment due to insufficient water absorption.
Innovation Solution
A swimming pool cleaning device equipped with a detection apparatus that includes a metal sheet attached to the inner surface of a sealed cavity, forming an equivalent capacitance relative to ground, and a controller to monitor capacitance changes and determine the immersion state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buoyancy block Hall detection method is used, then immersion state can be detected, but structural complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical buoyancy block Hall detection system with an electrical capacitance-based detection system. The metal sheet forms a capacitor with the water, and changes in capacitance directly indicate immersion state, eliminating the need for mechanical components and their associated complexity.
Solution Approach 2:
The patent detects immersion state by monitoring changes in electrical capacitance parameter. When the cleaning device enters water, the capacitance between the metal sheet and water changes, providing a direct electrical signal for state detection without mechanical intervention.
2Reliability
If electrode detection method is used, then immersion state can be detected, but electrode electrolysis and corrosion occur
Solution Approach 1:
The patent uses water itself as the intermediary medium for detection. The metal sheet forms a capacitor with the water, utilizing the water's dielectric properties rather than requiring direct electrical contact with electrodes, thereby avoiding electrolysis and corrosion.
Solution Approach 2:
The patent replaces the electrical electrode detection system with a capacitance-based detection system that does not require current flow through electrodes, eliminating the harmful electrolysis effect while maintaining detection functionality.
3Reliability
If water pump power detection method is used, then immersion state can be detected, but misjudgment occurs due to insufficient power difference
Solution Approach 1:
The patent replaces the indirect water pump power-based detection method with a direct capacitance measurement system. The capacitance change provides a clear, immediate signal for immersion state without relying on subtle power consumption differences that lead to misjudgment.
Solution Approach 2:
The patent uses the electrical field between the metal sheet and water as the detection mechanism, providing a direct and sensitive measurement of immersion state that overcomes the insufficient precision of power-based indirect detection methods.
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 solution provides accurate and sensitive monitoring of the immersion state, reducing costs and mechanical failures, avoiding electrolysis issues, and improving reliability and adaptability to various swimming pool devices and conditions.
Implementation Method 1
the metal sheet is attached to an inner surface of the main body and forms an equivalent capacitance relative to a ground, and the controller is electrically connected to the metal sheet to monitor capacitance changes of the equivalent capacitance
Data Source
AI summary
The present disclosure discloses swimming pool cleaning device, including a main body, a detection apparatus and a control system, wherein the detection apparatus is configured to detect an immersion state of the main body, and the control system is configured to control cleaning operations of the main body based on the immersion state; the detection apparatus includes a metal sheet and a controller, wherein the metal sheet is attached to an inner surface of the main body and forms an equivalent capacitance relative to a ground, and the controller is electrically connected to the metal sheet to monitor capacitance changes of the equivalent capacitance and determine the immersion state of the main body. The leaching water detection device can effectively identify whether the swimming pool device is immersed in water, has low cost and good applicability, has little influence on existing structures, and doesn't have the problem of electrolytic corrosion.