Boiler Limescale Removal Device for Heat Transmission Efficiency

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Solution Overview

Problem

Boilers used in domestic and professional appliances face inefficiencies due to limescale formation, which reduces heat transmission, alters temperature and pressure measurements, and poses safety risks, as existing solutions inadequately address the removal of limescale deposits on internal walls.

Innovation Solution

A boiler design incorporating a metal container with a limescale removal device that can be selectively activated, featuring a detection system to monitor water hardness, limescale deposits, and temperature, and a control unit coordinating the removal device's activation and speed to efficiently remove limescale from the internal walls, using a flexible cleaning element and motor-driven rotation mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a metal container is used for heating water, then heat transmission efficiency is improved, but limescale deposits form on internal walls reducing efficiency over time

Engineering Contradiction:
Improveheat transmission efficiencyVSAvoidlimescale deposit resistance
Core Design Contradiction:
Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies preliminary action by equipping the boiler with a detection device that monitors limescale deposit thickness in real-time, and a removal device that is activated automatically when deposits reach a critical threshold. This preventive approach removes limescale before it significantly impacts heat transmission efficiency, maintaining reliable operation over extended periods.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If limescale removal devices are added to the boiler, then limescale deposits are removed effectively, but device complexity increases

Engineering Contradiction:
Improvelimescale removal capabilityVSAvoidstructure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The removal device is designed with multi-functionality, serving both as a detection trigger and an active removal mechanism. The same mechanical structure that detects limescale thickness also performs the removal function, reducing the need for separate specialized components and thereby limiting the increase in overall device complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Loss of energy

If continuous monitoring and removal of limescale is implemented, then energy waste is reduced, but operational complexity increases

Engineering Contradiction:
Improveenergy waste from limescaleVSAvoidoperational simplicity
Core Design Contradiction:
Loss of energyVSEase of operation

Solution Approach 1:

The system implements self-service by using the detection device to automatically monitor limescale accumulation and trigger the removal device only when necessary. This on-demand operation eliminates the need for continuous manual intervention or constant operation of removal mechanisms, maintaining energy efficiency while preserving operational simplicity through automation.

Inventive Principle:
Principle #25Self-service

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 effectively prevents limescale buildup, reduces energy waste, maintains accurate temperature and pressure measurements, and extends the boiler's lifespan by ensuring thorough limescale removal and adaptive cleaning based on detected conditions.

Implementation Method 1

A heating element is normally associated with the metal container, generally an electric resistance or plate, which functions as a heat source

Methodology Applied
Scientific EffectJoule heating: Joule Heating

Implementation Method 2

Boilers normally also comprise one or more detection devices to detect the temperature and/or pressure inside the metal container

Methodology Applied
Scientific EffectTemperature detection:

Implementation Method 3

a limescale removal device, disposed at least partly inside the container, and able to be selectively activated from the outside, and suitable to cooperate with at least part of the bottom wall and/or with at least part of the lateral walls of the container to remove layers of limescale formed on the walls of the container

Methodology Applied
Scientific EffectMechanical removal: Mechanical Force

Data Source

PatentEP3446045B1boiler
Publication Date: 2021.06.02 DE LONGHI APPLIANCES SRL
  • EP3446045B1 patent drawingFigure 1~2
  • EP3446045B1 patent drawingFigure 3

AI summary

Boiler for generating steam and/or for heating water, comprising a metal container (12) provided at least with a feed aperture (14) to introduce water inside it, with a heating element (26) and with a discharge aperture (15) able to be selectively opened/closed to discharge the water and possible particles.