Litz Coil Induction Heater with Thermal Barrier
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Solution Overview
Problem
Existing crystal growers using induction heaters are electrically inefficient due to thermal isolators that increase electrical resistance and energy loss, requiring excessive energy to maintain precise temperatures for crystal growth.
Innovation Solution
A crystal growing apparatus with a Litz coil induction heater featuring a non-conductive inner liner, structural reinforcement, and a refractory housing with a thermal barrier, along with a coolant passage to enhance efficiency and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a thermal isolator is positioned between the induction heater and the heating target, then thermal radiation exchange is minimized, but electrical efficiency decreases due to increased distance and electrical resistance
Solution Approach 1:
The patent merges the thermal isolator function directly into the induction heater coil structure by coating the coil with a non-conductive, thermally insulating material. This eliminates the need for a separate thermal isolator positioned between the coil and target, thereby reducing the air gap and electrical resistance while still providing thermal radiation protection.
Solution Approach 2:
The induction heater coil is constructed as a composite structure with a conductive core (for electrical current flow) and a non-conductive coating layer (for thermal isolation). This composite design allows the single component to simultaneously provide both electrical conductivity and thermal insulation, resolving the contradiction between energy loss reduction and electrical efficiency.
2Temperature
If increased current is applied to the induction heater coil, then desired induction current and temperature are achieved, but power loss increases due to electrical resistance
Solution Approach 1:
By integrating the thermal isolator coating directly onto the coil, the patent reduces the air gap between the heating source and target. This shorter distance reduces electrical resistance and reactive power losses, allowing the system to achieve desired temperatures with lower current and reduced power loss.
Solution Approach 2:
The patent changes the physical parameters of the induction heater by modifying the coil structure with a coating layer, which alters the electrical characteristics (reducing resistance and inductance). This parameter change allows for more efficient energy transfer at the same power level or achieves the same heating effect with reduced power input.
3Loss of energy
If a distance is maintained between the heating target and the induction coil, then thermal isolation is achieved, but electrical efficiency decreases
Solution Approach 1:
The patent combines the thermal isolation function with the induction coil structure itself by applying a non-conductive coating. This eliminates the need for a separate physical distance or air gap for thermal isolation, allowing the coil to be positioned closer to the target while maintaining thermal management and improving electrical efficiency.
Solution Approach 2:
The non-conductive coating acts as an intermediary layer that provides thermal isolation without requiring an air gap. This mediator layer allows the coil to be positioned closer to the target, reducing electrical resistance while still providing the necessary thermal management function.
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 apparatus achieves approximately 62% higher electrical efficiency compared to conventional induction heaters, utilizing 82% of applied energy to induce current in the crystal material, resulting in significant cost savings and improved crystal growth quality.
Implementation Method 1
As a high frequency alternating current is passed through the conductive tubing, a magnetic flux is generated. The coil is positioned generally adjacent an object to be heated and the magnetic flux of the coil induces a current in the material to be heated.
Implementation Method 2
Due to the internal resistance of the material to be heated, inducing a current in the material results in the heating of the material.
Implementation Method 3
a thermal isolator is generally positioned between the heating target and the induction heater to minimize radiation thermal exchange between the induction coil and the heating target
Implementation Method 4
a hose constructed to receive the Litz coil therein
Data Source
AI summary
An apparatus and method of manufacturing a crystal grower is disclosed. The crystal growing apparatus includes a receptacle constructed to receive a material selected to grow a crystal and an induction heater constructed to heat the material, with the induction heater comprising a Litz coil and a hose constructed to receive the Litz coil therein. The hose further comprises an inner liner formed of an electrically non-conductive material, a reinforcement layer surrounding the inner liner to provide structural reinforcement thereto, and an outer liner applied about the reinforcement layer to form an exterior of the hose.