Heater Bundle Adaptive Control for Leakage Reduction

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Solution Overview

Problem

Electric fluid heaters, such as cartridge heaters, face issues like moisture contamination leading to dielectric breakdown and current leakage, resulting in costly downtime and reduced reliability due to improper sealing and insulation failure.

Innovation Solution

The implementation of a heater system with multiple independently controlled heating zones and power conductors allows for modulated power distribution, reducing current leakage and enabling continued operation even if one zone fails, through a controller that switches voltage to a reduced number of zones, ensuring desired power distribution and heat output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple heating zones are operated simultaneously to provide desired power distribution, then heating efficiency is improved, but current leakage increases

Engineering Contradiction:

Improveheating efficiencyVSAvoidcurrent leakage

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The controller operates heating zones in sequential cycles rather than simultaneously, switching between different zones in a periodic manner. This allows the system to maintain overall heating effectiveness while limiting the number of active zones at any given moment, thereby reducing current leakage through the insulation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically adjusts which heating zones are active based on real-time conditions, using a controller to switch between zones. This dynamic operation allows the system to optimize heating distribution while managing electrical load and minimizing current leakage by not all zones operating at full power simultaneously.

Inventive Principle:

Principle #15Dynamics

2Power

If all heating zones are activated to meet heating demand, then power distribution is improved, but risk of overheating and insulation failure increases

Engineering Contradiction:

Improvepower distributionVSAvoidinsulation reliability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The heating system is divided into multiple independent heating zones, each capable of being controlled separately. This segmentation allows the controller to activate only the necessary zones to meet heating demand, rather than operating all zones simultaneously, thereby distributing thermal and electrical load more safely and reducing the risk of overheating and insulation failure.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If cartridge heater is not properly sealed, then manufacturing simplicity is improved, but dielectric breakdown and heater failure occur

Engineering Contradiction:

Improvesealing simplicityVSAvoidheater reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The system incorporates self-diagnostic capabilities through the controller, which can detect conditions indicative of sealing failures or insulation degradation. By monitoring electrical parameters and heating patterns, the system can identify potential sealing issues before they lead to complete failure, allowing for preventive maintenance while maintaining manufacturing simplicity.

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

This solution enhances the reliability and efficiency of the heater system by reducing downtime, improving safety, and allowing for tailored heat distribution, while minimizing the risk of overheating and extending the lifespan of the heater units.

Implementation Method 1

a rod configuration to heat fluid that flows along or past an exterior surface of the cartridge heater

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

The moisture can also cause short circuiting between power conductors and the outer metal sheath

Methodology Applied

Scientific EffectDielectric insulation: Dielectric

Data Source

PatentEP3482603B1Heater bundle for adaptive control and method of reducing current leakage

Publication Date: 2023.11.01 WATLOW ELECTRIC MANUFACTURING CO

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AI summary

A method of controlling a heating system is provided that includes having at least one heater assembly, the heater assembly comprising a plurality of heater units, each heater unit defining at least one independently controlled heating zone, supplying power to each of the heater units through power conductors electrically connected to each of the independently controlled heating zones in each of the heater units, and modulating power supplied to each of the independently controlled heating zones. A voltage is selectively supplied to each of the independently controlled heating zones such that a reduced number of independently controlled heating zones receives the voltage at a time, or at least a subset of the independently controlled heating zones receive a reduced voltage at all times.