Magnetic Reed Switch Safety Switch for Condensate Pans
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Solution Overview
Problem
Existing safety switches for HVAC systems fail to reliably detect high water conditions in condensate pans due to environmental exposure and maintenance challenges, requiring ruggedness, ease of installation, and adjustability.
Innovation Solution
A safety switch with a molded plastic body and a float probe system, featuring a hollow elongated housing with a grille opening to allow water entry while preventing debris, and a magnetically activated reed switch in a watertight compartment, allowing for adjustable and low-maintenance operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional float mechanism is used in a safety switch, then the device can detect water level, but it requires frequent maintenance and fails reliably in extreme environments
Solution Approach 1:
The patent replaces the traditional mechanical float mechanism with a magnetic field-based detection system. A float containing a magnet moves with water level changes and actuates a reed switch through magnetic field interaction, eliminating direct mechanical contact and reducing maintenance requirements while improving reliability in extreme environments
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the float and the reed switch. The magnet in the float generates a magnetic field that actuates the reed switch without direct physical contact, allowing the float mechanism to operate reliably in extreme environments while minimizing maintenance needs
2Reliability
If a safety switch is designed to be rugged and sealed for extreme environments, then reliability improves, but installation complexity increases
Solution Approach 1:
The patent divides the safety switch into separate functional components: a sealed housing containing the reed switch and electronics, and an external float mechanism. This segmentation allows the sealed portion to be pre-assembled and tested for reliability, while the float can be easily positioned and adjusted during installation without compromising the sealed environment
3Adaptability or versatility
If a safety switch is designed to be adjustable for different condensate pan sizes and shapes, then versatility improves, but device complexity increases
Solution Approach 1:
The patent employs an adjustable float probe assembly that can be positioned at different heights and angles to accommodate various condensate pan configurations. The float probe is mounted on an adjustable support structure allowing vertical and angular adjustment, providing versatility for different pan sizes and shapes without requiring multiple specialized devices
Solution Approach 2:
The safety switch is designed with universal adaptability through adjustable mounting options and a flexible float probe positioning system. A single device configuration can serve multiple condensate pan types by adjusting the float probe position, eliminating the need for multiple specialized switches and reducing overall system complexity
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 a reliable, easy-to-install, and virtually maintenance-free safety switch that effectively detects high water levels in condensate pans, ensuring proper operation and system shutdown or alarm activation, while withstanding extreme environments.
Implementation Method 1
A float is position within the hollow elongated housing of the float probe for free movement up and down in response to entry of water into the elongated housing through the grille opening at the lower end
Implementation Method 2
The float includes a magnet. A reed switch is mounted in a watertight compartment extending along one wall of the elongated housing. When the float carries the magnet to a predetermined elevation within the elongated housing, the magnet causes the reed switch to open
Data Source
AI summary
A safety switch for sensing the level of water in a condensate pan has a molded plastic body with an attachment section and a float probe. The attachment section includes a collar that fits over and connects to the side edge of the condensate pan. The float probe comprises a hollow elongated housing with a grille opening to allow entry of water. A float, position within the hollow elongated housing, moves in response to entry of water into the elongated housing. The float includes a magnet that activates a reed switch mounted in a watertight compartment extending along one wall of the elongated housing. The float probe may be fixedly or adjustably attached to the molded body of the safety switch. For adjustable attachment, the float probe is snugly fit into the opening of a yoke so that the float probe can be raised or lowered or inclined with respect to the yoke.