Magnetic Coupling Float Switch for Sealed Sump Pump Control
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Solution Overview
Problem
Conventional float switch apparatuses for sump pits are not adequately sealed to prevent gas leakage and electrical components are not isolated from the sump atmosphere, failing to meet safety and building codes, and existing systems with multiple float switches are expensive, cumbersome, and prone to failure due to entanglement.
Innovation Solution
A sealed float switch apparatus with a magnetic coupling system where a float-mounted magnetic activation device, connected to a cam, activates multiple switches for different pumps based on liquid levels, ensuring electrical components remain isolated from the sump atmosphere and reducing the need for multiple float switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional float switch apparatuses are used in sump pits, then liquid level monitoring function is provided, but the apparatus fails to meet safety and building codes regarding gas leakage prevention and electrical component isolation
Solution Approach 1:
The float switch apparatus is divided into separate sealed chambers - a first sealed chamber containing the float mechanism and a second sealed chamber containing electrical components. This segmentation isolates electrical components from the sump atmosphere while maintaining liquid level monitoring functionality, thereby meeting safety and building code requirements without excessive complexity.
Solution Approach 2:
A sealed wall or barrier acts as an intermediary between the float mechanism chamber and the electrical components chamber. This intermediary structure transmits the magnetic field from the float-attached magnet to the reed switches while preventing direct contact between electrical components and the sump atmosphere, thus achieving both safety compliance and functional requirement.
2Adaptability or versatility
If multiple separate float switches are used to control multiple pumps and alarms, then comprehensive level monitoring is achieved, but the system becomes expensive, cumbersome and prone to failure due to component entanglement
Solution Approach 1:
Multiple float switches are merged into a single integrated float switch apparatus. A single float mechanism with a magnet attached to it controls multiple reed switches mounted on the sealed wall through magnetic field interaction. This merging reduces the number of separate float switches from multiple to one, eliminating component entanglement issues while maintaining the capability to control multiple pumps and alarms at different liquid levels.
Solution Approach 2:
The single float switch apparatus performs multiple functions by controlling different pumps and alarms at different liquid levels. The float mechanism with its attached magnet universally activates various reed switches based on liquid level, replacing the need for multiple specialized float switches and providing multi-functionality within a single device.
3Measurement precision
If multiple micro switches with cams are used to activate pumps at different levels, then precise level-based control is achieved, but the apparatus cannot be sealed to prevent gas leakage and isolate electrical components
Solution Approach 1:
The mechanical cam-and-microswitch system is replaced with a magnetic field-based system. Instead of mechanical cams physically contacting micro switches, a magnet attached to the float wirelessly activates reed switches through magnetic field interaction across a sealed wall. This substitution maintains precise liquid level detection capability while enabling effective sealing to prevent gas leakage and isolate electrical components.
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 magnetic coupling system effectively controls multiple pumps and alarms within a sealed electrical chamber, ensuring safety compliance and reducing the risk of component entanglement and failure, while maintaining efficient operation and cost-effectiveness.
Implementation Method 1
a magnetic coupling head configured to magnetically couple to the magnetic activation device through the coupling wall such that vertical displacement of the magnetic coupling head results in a corresponding vertical displacement of the magnetic activation device
Data Source
AI summary
The invention pertains to a float switch apparatus for use in activating one or a series of pumps. The float switch apparatus has particular use in combination with sump pump vessels. The apparatus includes an electrical chamber which is sealed from the vessel atmosphere and contains at least one switch controlling the activation of at least one pump, configured to pump liquid from the vessel. Within the electrical chamber there is a magnetic activation device which slides vertically along one wall of the chamber. On the opposing side of the chamber there is a magnetic coupling head which couples to the activation device magnetically through the coupling wall. The coupling head is mounted on top of a float rod having a float mechanism at the bottom thereof. The entire float switch apparatus is mounted in the vessel such that when the water reaches a predetermined level the float moves the float rod vertically and thus the coupling head is moved vertically. Since the coupling head is coupled to the magnetic activation device in the sealed electrical chamber, the activation device is also moved vertically and activates at least one switch for controlling the activation of a pump. The liquid in the vessel in then pumped out and the float rod moves down vertically in response. At a predetermined point the magnetic activation device no longer activates the switch controlling the pump and the pump is turned off. This device allows the electrical components of the float switch apparatus to remain sealed from the vessel atmosphere.