Inductive Heating Device with Fluid-Tight Coil for Rapid Heat Transfer
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Solution Overview
Problem
Existing heating devices for liquid media generate heat in areas separate from the fluid channel, leading to delayed heating due to contact resistances, which is inefficient.
Innovation Solution
A heating device with a hollow cylindrical coil generating an alternating magnetic field, housed in a thermally conductive coil housing that is fluid-tight and insertable into a housing with a fluid channel, allowing direct fluid flow around the coil for efficient heat transfer and prevention of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heating element is placed in a separate area from the fluid channel, then the heating element can be protected from corrosive influences, but heat transfer efficiency deteriorates due to contact resistances
Solution Approach 1:
The patent introduces a thermally conductive coating layer as an intermediary between the heating element and the fluid channel wall. This coating serves dual purposes: it protects the heating element from corrosive fluid contact while maintaining efficient thermal coupling through its high thermal conductivity, thus resolving the contradiction between protection and heat transfer efficiency
Solution Approach 2:
The patent replaces direct mechanical contact heating with inductive heating. The heating element generates an alternating magnetic field that induces eddy currents in the fluid channel wall, which then generates heat directly at the location where it is needed. This eliminates the need for direct thermal contact while maintaining efficient heat transfer
2Loss of energy
If the coil is directly exposed to the fluid, then heat transfer efficiency improves, but the coil is exposed to corrosive influences and short circuit risks
Solution Approach 1:
The thermally conductive coating acts as an intermediary layer that allows efficient heat transfer from the coil to the fluid channel wall while simultaneously providing electrical isolation and corrosion protection. This resolves the contradiction by maintaining thermal coupling while preventing electrical contact with the fluid
Solution Approach 2:
The patent uses a thin thermally conductive coating film that provides the necessary protection while maintaining thermal efficiency. The thin film structure allows heat to conduct through effectively while still providing sufficient barrier properties against corrosion and electrical isolation
3Loss of energy
If a PTC heating element is used in liquid media, then heating can be achieved, but the structure must be fundamentally different from air-side heating devices
Solution Approach 1:
The patent replaces the PTC (positive temperature coefficient) heating mechanism with inductive heating. Instead of relying on electrical resistance heating through a PTC element that requires complex sealing and electrical connections in the liquid environment, the system uses an alternating magnetic field to induce heating in the fluid channel wall itself, simplifying the overall structure while maintaining effective heating capability
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 rapid and effective heating of the fluid by ensuring the coil is not exposed to corrosive influences and allows for improved heat dissipation, reducing contact resistances and enhancing the heating process.
Implementation Method 1
an element generating an alternating magnetic field being provided in the housing, at least one metallic surface heating element being provided which is caused by the alternating magnetic field can be heated
Implementation Method 2
the coil housing is thermally conductive, and wherein the housing at a first of its axial end regions through a first cover and at a second of its axial end regions through a second The cover can be closed in a fluid-tight manner
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a heating device (1) comprising a housing (3) having a fluid channel arranged therein with a fluid inlet (6, 7) and a fluid outlet (6, 7), wherein an element generating an alternating magnetic field is provided in the housing (3), wherein, furthermore, at least one metallic panel heating element (18, 19, 20) is provided, which is heatable by the alternating magnetic field, wherein the at least one panel heating element (18, 19, 20) is arranged in the fluid channel, wherein the element generating the alternating magnetic field is formed by a coil (8) shaped in hollow-cylindrical fashion, which coil (8) is operable by an AC voltage, wherein the coil (8) is separated in fluidtight fashion from the fluid channel.