Capacitive Drainpipe Clamp for Noninvasive Overflow Detection
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Solution Overview
Problem
Air conditioning and refrigeration systems often experience blockages in drainpipes due to algae, mold, mildew, or debris, leading to condensate overflow and potential water damage, as existing solutions fail to effectively monitor and address occlusions in a non-invasive and efficient manner.
Innovation Solution
A noninvasive solid-state safety device is clamped onto a drainpipe, utilizing arcuate sensor plates to detect changes in capacitance caused by condensate, triggering a safety overflow circuit to notify users of blockages and disabling the compressor until the obstruction is cleared, thereby preventing further condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a noninvasive solid-state safety device is clamped onto a drainpipe to detect blockages, then water damage is prevented through early detection, but the device complexity increases due to the need for capacitance sensing circuitry and compressor control integration
Solution Approach 1:
The patent replaces mechanical float-based level detection with a solid-state capacitance sensing system. The sensor uses electrical capacitance changes to detect water level in the drain pan, eliminating moving mechanical parts and improving reliability while reducing maintenance needs.
Solution Approach 2:
The patent introduces a control board as an intermediary component that processes signals from the capacitance sensor and automatically controls the compressor shutdown. This intermediary integrates the detection and control functions, managing the system complexity through centralized intelligence rather than distributed mechanical switches.
2Reliability
If the safety device automatically disables the compressor upon detecting blockage, then condensate accumulation is prevented, but loss of cooling function occurs until manual reset is performed
Solution Approach 1:
The patent applies preliminary anti-action by shutting down the compressor before the drain pan overflows. The capacitance sensor detects water level rise early in the blockage process, triggering compressor shutdown before catastrophic overflow occurs, preventing water damage while maintaining system protection.
Solution Approach 2:
The patent implements a feedback loop where the capacitance sensor continuously monitors drain pan water level and provides real-time feedback to the control board. When blockage is detected, the system shuts down the compressor and requires manual reset, ensuring the operator addresses the underlying blockage issue before resuming operation.
3Ease of operation
If capacitance sensing is used to detect condensate level, then noninvasive monitoring is achieved, but measurement precision challenges arise due to varying dielectric properties of condensate
Solution Approach 1:
The patent monitors changes in capacitance parameters as water accumulates in the drain pan. The control board tracks the evolution of capacitance values over time, detecting the transition from air-filled to water-filled state. This dynamic parameter monitoring compensates for variations in dielectric properties and provides reliable level detection.
Solution Approach 2:
The patent performs preliminary calibration or baseline measurement of the capacitance sensor during system installation or initial operation. By establishing reference capacitance values for empty and full drain pan conditions, the system creates a calibration curve that improves subsequent measurement precision and compensates for environmental variations.
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 device effectively detects blockages in drainpipes, preventing overflows and water damage by alerting users and automatically disabling the compressor, ensuring early detection and prevention of condensate accumulation issues without requiring invasive installation or moving parts.
Implementation Method 1
senses when condensate is blocked in a drainpipe created by the increased capacitance of the blocked condensate
Data Source
AI summary
A noninvasive security device for detection of blocked fluid flow within a conduit includes clamping body that may be affixed to the conduit and a safety overflow circuit mounted to the clamping body. The safety overflow circuit includes first and second sensor pads that act as the metal plates of a capacitor. The sensor pads are connected to the clamping body and positioned proximate the conduit to measure the capacitance within the conduit. The capacitance will be low when water is freely flowing through the conduit, since the dielectric constant will be similar to that of air. However, when the water level increases in the conduit, the dielectric constant will increase as will the capacitance, such that a pulse signal is generated to notify the user of the occlusion and to further disable the source of the water to the conduit.