Heating Device Temperature Detection Thermal Conduction

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Solution Overview

Problem

Existing heating devices are unable to swiftly interrupt current to the heater due to deteriorated responsiveness of temperature detection means placed outside the housing, leading to decreased accuracy in detecting accidental heating of an empty passage, which can result in smoke or fire.

Innovation Solution

A heating device with a temperature detection means in direct contact with the heating portion, connected via seal members, to accurately detect the temperature of the heating medium and interrupt current promptly, preventing accidental heating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the temperature detection means is placed outside the housing on a non-heating portion, then the device structure is simpler, but the responsiveness of energization interruption deteriorates and detection accuracy decreases

Engineering Contradiction:

Improvedevice structureVSAvoidresponsiveness of energization interruption

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces a thermal conduction member (intermediary) that bridges the heating portion and the temperature detection means. This mediator efficiently transfers heat from the heating portion to the detection means, enabling rapid temperature detection without requiring the detector to be in direct contact with the heating element, thus maintaining both structural simplicity and high responsiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical contact between the temperature detection means and the heating portion with a thermal conduction-based system. The thermal conduction member substitutes the need for direct mounting of the detector on the heating element, using thermal field transmission instead of mechanical positioning, which improves responsiveness while simplifying the overall device structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If the temperature detection means is placed outside the housing, then the housing structure is simpler, but the accuracy of detecting accidental heating of an empty passage decreases

Engineering Contradiction:

Improvehousing structureVSAvoidaccuracy of detecting accidental heating

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The thermal conduction member acts as an intermediary that accurately reflects the temperature state of the heating portion to the detection means. This ensures that even when the detector is mounted outside the housing, it receives accurate temperature information from the heating portion, maintaining high measurement precision for detecting accidental heating conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the temperature detection function from the housing structure by introducing a dedicated thermal conduction member. This separation allows the housing to maintain its simple structure while the thermal conduction member ensures accurate temperature transmission, enabling the detection system to independently achieve high measurement precision without complicating the housing design.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the temperature detection means contacts the heating portion directly, then the responsiveness and detection accuracy improve, but the device complexity increases

Engineering Contradiction:

Improveresponsiveness of energization interruptionVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the thermal conduction function with the structural support function by designing the thermal conduction member as an integrated component that both conducts heat and provides mechanical support for the temperature detection means. This combination reduces the number of separate components needed, thereby limiting the increase in device complexity while maintaining high responsiveness.

Inventive Principle:

Principle #5Merging (Combining)

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 enables high-accuracy detection of accidental heating in an empty passage, ensuring rapid interruption of energization to prevent smoke or fire, thereby enhancing the reliability of the heating device.

Implementation Method 1

a heating device includes a heater having a heating portion which generates heat by energization

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

The temperature detection means is brought into contact with the heating portion

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS9271332B2Heating device

Publication Date: 2016.02.23 SANDEN CORP

AI summary

A heating device includes a heater (2) having a heating portion (6) which generates heat by energization; a housing (4) which contains the heating portion and forms a passage (18) for a heating medium between the housing and the heating portion; a temperature sensor (26) for detecting the temperature of the heating medium in the passage; and an inverter for interrupting energization of, that is, the carrying of current to, the heater depending on the temperature of the heating medium detected by the temperature sensor. The temperature sensor is brought into contact with the heating portion.