Spring-Actuated Float Switch for Mercury-Free Pump Level Control

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Solution Overview

Problem

The need for an environmentally friendly alternative to mercury-based float switches that effectively control fluid levels in tanks by actuating pumps based on fluid level changes exists, as mercury use is discouraged due to environmental concerns.

Innovation Solution

A spring-actuated float switch with a housing and tether that tilts relative to fluid level changes, incorporating an electrical switch mechanism with movable contacts and a spherical ball to complete or break the electrical circuit, utilizing spring energy for activation and deactivation, and adjustable angle barriers for precise control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mercury is used in float switches, then reliable pump control is achieved, but environmental harm increases

Engineering Contradiction:

Improvepump control reliabilityVSAvoidenvironmental harm

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent removes mercury from the float switch system entirely, extracting the harmful substance while preserving the functional requirements. The invention achieves reliable pump control without mercury by using a mechanical tilt-switch mechanism with a spherical float and magnetic reed switch, eliminating environmental contamination risks while maintaining operational reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs inexpensive, non-toxic materials such as plastic housing, stainless steel components, and standard electrical contacts that can be easily replaced if needed. These materials are environmentally safe and eliminate the long-term environmental burden associated with mercury, while providing sufficient service life for the application.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If a spring actuation mechanism is used, then electrical contact cleanliness is improved, but device complexity increases

Engineering Contradiction:

Improveelectrical contact cleanlinessVSAvoidswitch mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the switch mechanism into distinct functional segments: the spherical float for level detection, the tilt-switch body for mechanical amplification, the spring for contact pressure and wiping action, and the electrical contacts for circuit completion. This segmentation allows each component to perform its specific function efficiently, with the spring specifically tasked with maintaining contact cleanliness through its wiping action during closure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spring mechanism performs self-cleaning of the electrical contacts through its inherent wiping action during contact closure. As the contacts make and break, the spring force creates a slight sliding motion that removes oxidation and contaminants, maintaining contact cleanliness without requiring external maintenance or additional cleaning mechanisms.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If adjustable angle barriers are incorporated, then adaptability to different tank sizes is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvetank size adaptabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent incorporates adjustable angle barriers that can be repositioned or removed to change the activation threshold angles of the float switch. This dynamic adjustability allows the same device to be configured for different tank sizes and fluid level requirements. The barriers are designed to be simple mechanical components that can be adjusted during installation or maintenance without requiring complex manufacturing processes.

Inventive Principle:

Principle #15Dynamics

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

Enables reliable and efficient pump activation and deactivation based on fluid levels, ensuring consistent electrical contact cleanliness and allowing for adjustable operation thresholds, making it suitable for various tank sizes and applications.

Implementation Method 1

a ball (e.g., spherical) disposed within the housing of the float switch is caused to move by gravity acting on the weight of the ball

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

the housing configured to float at the surface of a fluid in a tank

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Implementation Method 3

A 'Flat Spring' or 'Flat Spring Contact Armature' may extend into the Armature Contact Lever

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12531196B2Spring actuated float switch

Publication Date: 2026.01.20 ALDERON IND LLC

AI summary

A float switch assembly for use in actuating a switch to operate a pump to control the level of a fluid in a tank. A float switch assembly for operating a pump to control the level of a fluid in a tank based in part on the angle of the float switch caused by the varying fluid level. A system for controlling a level of a fluid in a tank, the system including a pump fluidly coupled to the tank and configured to pump the fluid from the tank to lower the level of the fluid in the tank.