Liquid Infusion Solenoid With Magnetic Return-to-Origin Fixation

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Solution Overview

Problem

Existing liquid infusion devices face challenges in ensuring that the magnet of the solenoid valve structure returns to its origin and remains fixed when the device is off, leading to potential unintended liquid discharge and high power consumption.

Innovation Solution

A solenoid structure with a steel plate positioned on one side, utilizing the attractive force between the magnet and the steel plate to fix the movable body at a specific point when the device is off, and reducing power consumption by selectively supplying power during the reciprocating motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If power is continuously supplied to the solenoid to maintain magnet position, then the magnet remains fixed in position, but power consumption increases

Engineering Contradiction:

Improvemagnet position stabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The steel plate provides a passive magnetic attraction force that automatically returns and holds the magnet at the origin position without requiring continuous power supply. The system uses the inherent magnetic properties of the steel plate to maintain position stability, eliminating the need for continuous energization of the solenoid.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Power is supplied to the solenoid only during the reciprocating motion phase when needed to move the magnet, and cut off when the magnet reaches the origin position. The steel plate then maintains the position passively, creating a periodic power supply pattern that reduces overall energy consumption while ensuring reliable positioning.

Inventive Principle:

Principle #19Periodic action

2Device complexity

If no fixation mechanism is used for the magnet, then device complexity is reduced, but unintended liquid discharge occurs when device is off

Engineering Contradiction:

Improvestructure simplicityVSAvoidliquid discharge control

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The steel plate acts as an intermediary fixation mechanism between the magnet and the solenoid structure. It provides a passive magnetic attraction force that reliably returns and holds the magnet at the origin position without requiring complex mechanical fixtures or additional active control systems, thus maintaining structural simplicity while ensuring reliable liquid discharge prevention.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Force

If steel plate is positioned to maximize magnetic attraction, then magnet fixation strength increases, but magnetic interference with external devices increases

Engineering Contradiction:

Improvemagnetic attraction forceVSAvoidexternal magnetic interference

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The steel plate is strategically positioned and dimensioned to concentrate magnetic attraction force locally at the origin position where the magnet needs fixation, while its geometry and material properties are optimized to contain the magnetic field within the device boundaries. This creates strong local magnetic fixation without excessive external magnetic interference.

Inventive Principle:

Principle #3Local quality

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

Prevents unintended liquid discharge and reduces power consumption by ensuring the magnet returns to a fixed position and using the attractive force for motion, while shielding external magnetic interference.

Implementation Method 1

a solenoid 130 that generates magnetic force when powered

Methodology Applied

Scientific EffectMagnetic force generation: Electromagnet

Implementation Method 2

a steel plate 180 configured to interact with the magnet of the first movable body through attractive force. When the solenoid is not powered, the first movable body is fixed at either the first or second point due to the attractive force between the magnet and the steel plate

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS12433992B2Liquid infusion device equipped with a magnetic return-to-origin and fixation means

Publication Date: 2025.10.07 CURESTREAM CO LTD

AI summary

The present invention relates to a liquid infusion device composed of a combination of a reusable module, which can be used repeatedly, and a disposable module, which is replaced after use. The present invention includes a solenoid (130) that generates magnetic force when powered, a first movable body (140) equipped with a magnet that performs a reciprocating motion driven by the magnetic force of the solenoid, and a steel plate (180) configured to interact with the magnet of the first movable body through attractive force. The reciprocating first movable body moves between a first point, where it is closest to the solenoid, and a second point, where it is farthest from the solenoid. When the solenoid is not powered, the first movable body is fixed at either the first or second point due to the attractive force between the magnet and the steel plate.