Dual-Flap Valve Assembly for Symmetric Chamber Pressure Control
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Solution Overview
Problem
Conventional manufacturing systems face challenges in precisely controlling high and low mass flow rates of process gases in semiconductor fabrication, leading to asymmetric flow regulation and pressure control, which can result in erratic flow and pressure buildup, affecting the quality of deposited films.
Innovation Solution
A valve assembly with a housing, a first flap coupled to a first shaft and a second flap coupled to a second shaft, along with gear assemblies, is designed to rotate the flaps from a closed to an open position and vice versa, allowing for symmetric control of gas flow, minimizing turbulence and corrosion, and optimizing pressure and flow rates in semiconductor process chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional throttling valves are used to control mass flow rates, then the system can control gas flow, but the flow control is asymmetric leading to erratic flow and pressure buildup
Solution Approach 1:
The patent applies asymmetry by using two separate flaps (first flap and second flap) that can be independently controlled, rather than a single symmetric valve. This allows asymmetric adjustment of flow paths to achieve symmetric and stable flow control. The gear assembly coordinates the two flaps to move in complementary ways, resolving the erratic flow issues caused by conventional single-valve asymmetric throttling.
Solution Approach 2:
The conventional single throttling valve is segmented into two separate flaps, each controlled by its own shaft and gear assembly. This segmentation allows independent control of different flow paths, enabling precise and stable flow regulation that eliminates the erratic behavior associated with single-valve systems.
2Quantity of substance
If high mass flow rates are controlled using conventional valves, then high flow capability is achieved, but low flow rate precision is compromised
Solution Approach 1:
The system employs dynamic control through independently adjustable flaps that can be positioned at different angles to optimize for different flow rates. At high flow rates, both flaps can be positioned for maximum opening; at low flow rates, the flaps can be adjusted to provide fine-grained control, achieving precision across the entire flow range.
Solution Approach 2:
The invention changes the control parameter from single-valve opening degree to dual-flap positioning angles. By independently adjusting the first and second flaps, the system can optimize flow characteristics for different operating conditions, achieving both high flow capability and low flow precision through parameter optimization.
3Device complexity
If asymmetric flow regulation is used, then valve simplicity is maintained, but pressure control stability deteriorates
Solution Approach 1:
The patent merges two valve mechanisms into a coordinated system controlled by a single gear assembly. This combination maintains operational simplicity while achieving stable pressure control through the complementary action of two flaps that balance flow regulation and reduce erratic pressure variations.
4Device complexity
If conventional single-valve systems are used, then device complexity is low, but flow control precision and stability are compromised
Solution Approach 1:
The valve assembly is segmented into two independently controllable flaps, each with its own shaft and gear-driven mechanism. This segmentation enables precise control of flow and pressure by adjusting each flap's position, achieving manufacturing precision that outweighs the moderate increase in device complexity.
Data Source
AI summary
Disclosed herein are embodiments of a value assembly, methods of manufacturing the same, and methods of using the same. In one embodiment, a sensor assembly comprises a housing having a through-bore, a first flap coupled to a first shaft and a second flap coupled to a second shaft, wherein the first shaft and the second shaft are coupled within the housing; and one or more gear assemblies coupled to the first shaft and the second shaft, wherein the gear assemblies are configured to rotate the first flap and the second flap from a first position to a second position to prevent a flow from traversing through the through-bore, and from the second position to the first position to allow the flow to traverse through the through-bore.