Pipe Heater Assembly for Uniform Gas Line Heating
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Solution Overview
Problem
In semiconductor device manufacturing, temperature unevenness in the heating process of gas pipes can lead to liquefaction of gases and inefficient film formation, affecting the quality of the substrate processing.
Innovation Solution
A pipe heater assembly comprising a first heater sheet with a non-self-controllable electric heater and a second heater sheet with self-controllable electric heaters, both surrounded by insulators, is used to uniformly heat the gas pipes, ensuring consistent temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heater is used to heat the gas pipe, then the heating process is simple, but temperature unevenness occurs causing gas liquefaction
Solution Approach 1:
The heater is divided into multiple independent heating sections (first heating section, second heating section, third heating section) that can be controlled separately. Each section corresponds to a specific region of the gas pipe, allowing independent temperature control to eliminate temperature unevenness while maintaining a relatively simple overall heater structure.
Solution Approach 2:
Different heating sections are equipped with different heating powers and control strategies based on local temperature requirements. The first heating section has higher heating power for rapid heating, while the second and third sections have lower heating power for maintaining temperature, ensuring each region receives appropriate heating to prevent gas liquefaction.
2Reliability
If heating power is increased to prevent gas liquefaction, then gas liquefaction is suppressed, but temperature unevenness and overheating occur
Solution Approach 1:
Temperature sensors are installed in each heating section to detect local temperatures, and the control unit adjusts the heating power of each section based on feedback from these sensors. This closed-loop control ensures that each region maintains its target temperature, preventing both gas liquefaction and overheating while achieving uniform temperature distribution.
Solution Approach 2:
The heating system transitions from static, uniform heating to dynamic, adaptive heating where each section's power output is continuously adjusted based on real-time temperature conditions. This dynamic control allows the system to respond to changing thermal conditions and maintain optimal temperature distribution throughout the gas pipe.
3Temperature
If multiple heater sections with different powers are used, then temperature uniformity is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it controls the opening/closing of solenoid valves, regulates heating power of multiple sections, and processes temperature feedback from various sensors. This multi-functional control approach consolidates what could be multiple separate control systems into a single integrated unit, reducing overall system complexity while achieving precise temperature uniformity.
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 configuration effectively suppresses temperature unevenness, preventing gas liquefaction and enhancing the quality of the substrate processing by maintaining a uniform temperature along the gas pipes, thereby improving the consistency and quality of the film formed on the substrates.
Implementation Method 1
a first electric heater having no self-controllability and a first insulator electrically insulating and surrounding the first electric heater
Implementation Method 2
a first insulator electrically insulating and surrounding the first electric heater
Data Source
AI summary
A heater assembly includes: a first heater sheet including a first electric heater having no self-controllability and a first insulator electrically insulating and surrounding the first electric heater, the first heater sheet being deformable in accordance with a shape of a heating target; and one or more second heater sheets each including one or more second electric heaters having self-controllability and a second insulator electrically insulating and surrounding the one or more second electric heaters, the one or more second heater sheets being deformable in accordance with the shape of the heating target.