Layered Laminar Flow Restrictor Sealing for Accurate Gas Delivery
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Solution Overview
Problem
Current mass flow control technologies in semiconductor fabrication face challenges in achieving high accuracy, repeatability, and reduced equipment costs, with a need for improved flow restrictors and seals to enhance gas delivery consistency and transient response times.
Innovation Solution
The development of laminar flow restrictors with multiple layers and seals designed to form a fluid-tight connection, allowing for precise control of gas flow by creating specific flow impedance and minimizing bypass, utilizing a manufacturing method involving layer blanks, etching, and bonding to form apertures and flow passages, and incorporating seals for enhanced sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow restrictors are used, then equipment costs are reduced, but measurement precision and flow control accuracy deteriorate
Solution Approach 1:
The flow restrictor is segmented into multiple thin layers (e.g., 10-100 layers) stacked together, with flow passages formed through alternating layers. This segmentation allows precise control of flow characteristics while maintaining manufacturing feasibility through standardized layer fabrication and stacking processes.
Solution Approach 2:
The invention transitions from traditional single-layer or simple geometric restrictors to a multi-layer stacked structure where flow passages extend through multiple dimensions. The flow paths wind through alternating layers in different orientations, creating complex three-dimensional flow control from simple two-dimensional layer patterns.
2Reliability
If flow restrictors with higher precision are implemented, then gas delivery consistency improves, but manufacturing complexity increases
Solution Approach 1:
The restrictor is divided into multiple identical or similar layers that can be fabricated using the same manufacturing process, then stacked and bonded. This segmentation enables consistent flow characteristics across production batches while simplifying manufacturing through repetition of standardized layer fabrication.
Solution Approach 2:
Multiple thin layers are combined through stacking and bonding to create a unified flow restrictor component. The layers are merged into a single functional unit with cumulative flow control properties, achieving high precision through the combined effect of multiple standardized elements rather than requiring complex monolithic fabrication.
3Measurement precision
If sealing structures are added to prevent bypass flow, then flow measurement accuracy improves, but device complexity increases
Solution Approach 1:
The sealing function is merged with the structural layers of the flow restrictor itself. The same layers that define flow passages also provide sealing surfaces at their interfaces, eliminating the need for separate sealing components. This integration achieves bypass prevention while maintaining the simplicity of the layered structure.
4Loss of time
If multiple layers are used to improve flow control, then transient response time improves, but manufacturing complexity increases
Solution Approach 1:
The multi-layer structure segments the flow path into multiple short sections through alternating layers, creating numerous small flow restrictions in series. This segmentation reduces the overall volume of gas that must be accelerated and decelerated during transient conditions, improving response time while using simple, repeatable layer fabrication processes.
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 provides improved accuracy and repeatability in gas flow control, reduces calibration requirements, and minimizes gas leakage, resulting in more reliable and cost-effective mass flow control systems for semiconductor fabrication and other industrial processes.
Implementation Method 1
precisely calibrated laminar flow restrictors which are effectively sealed to prevent bypass flow
Implementation Method 2
seals for enhanced sealing efficiency
Data Source
AI summary
Apparatuses for controlling gas flow are important components for delivering process gases for semiconductor fabrication. These apparatuses for controlling gas flow frequently rely on flow restrictors which can provide a known flow impedance of the process gas. In one embodiment, a flow restrictor is disclosed, the flow restrictor constructed of a plurality of layers, one or more of the layers having a flow passage therein that extends from a first aperture at a first end of the flow restrictor to a second aperture at a second end of the flow restrictor.