Vapor Generator Sonic Throat Ejector for Alloy Coating
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Solution Overview
Problem
Current industrial vapor generators for metal coating in vacuum face challenges such as complexity in implementation, maintenance, uneven deposition, difficulty in adjusting to variable strip widths, impurity concentration, and inefficient vapor flow regulation, particularly when dealing with co-deposition of two different metals.
Innovation Solution
A vapor generator design featuring a cylindrical crucible with magnetic stirring, a longitudinal sonic throat ejector, and a filtration medium, along with a proportional valve and radiant heating, allows for even vapor distribution and easy adjustment to strip width, while maintaining a vacuum seal and reducing thermal inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical shutters with two positions are used to control vapor flow, then vapor flow can be controlled, but the system becomes complex and difficult to maintain
Solution Approach 1:
The patent replaces mechanical shutters with electromagnetic valves to control vapor flow. This substitution eliminates the complexity of mechanical two-position shutters while maintaining precise flow control capability, directly resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The patent introduces a proportional valve that can adjust the opening degree continuously, changing the control parameter from binary (open/closed) to continuous (0-100% opening). This allows precise vapor flow control without complex mechanical mechanisms, resolving the contradiction between operational control and system complexity.
2Use of energy by moving object
If induction heating is used to heat the crucible, then heating efficiency is improved, but thermal inertia increases
Solution Approach 1:
The patent uses a programmable logic controller to dynamically adjust the induction heating power in real-time based on process requirements. This dynamic control allows rapid adjustment of heating intensity, reducing thermal inertia while maintaining high heating efficiency through optimized energy delivery.
Solution Approach 2:
The patent implements a feedback control system where the PLC monitors temperature and vapor flow conditions, then adjusts induction heating power accordingly. This feedback mechanism prevents excessive thermal inertia by modulating heating intensity to match actual process needs, resolving the contradiction between heating efficiency and thermal response time.
3Adaptability or versatility
If co-evaporation from two crucibles is used, then alloy coating can be deposited, but the system becomes complex
Solution Approach 1:
The patent designs a single crucible system that can handle multiple metals through sequential or simultaneous evaporation, controlled by electromagnetic valves. This universal design achieves alloy coating capability without requiring separate crucibles for each metal, resolving the contradiction between versatility and system complexity.
Solution Approach 2:
The patent introduces electromagnetic valves as intermediary control elements that regulate vapor flow from the crucible. These valves enable precise control of multi-metal evaporation processes without requiring complex mechanical shutter systems, achieving alloy deposition capability while maintaining system simplicity.
4Ease of operation
If all or nothing valves are used, then vapor flow can be controlled, but adjustment precision is limited
Solution Approach 1:
The patent replaces binary-position valves with proportional electromagnetic valves that can adjust their opening degree continuously. This parameter change from discrete to continuous control enables precise vapor flow rate adjustment, resolving the contradiction between operational ease and measurement precision.
Solution Approach 2:
The patent substitutes mechanical two-position shutters with electronically controlled electromagnetic valves. This substitution enables precise digital control of vapor flow rates through programmable logic controllers, achieving high flow rate precision while maintaining ease of operation through automated control.
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 ensures even and efficient metal deposition with simplified maintenance, high vapor flow rates, and precise control over vapor flow and temperature, enabling effective co-deposition of multiple metals with reduced impurity segregation and thermal management.
Implementation Method 1
a cylindrical crucible with magnetic stirring
Implementation Method 2
along with a proportional valve and radiant heating
Implementation Method 3
a longitudinal sonic throat ejector, and a filtration medium
Implementation Method 4
a longitudinal sonic throat ejector... shaped so as to create a jet of metal vapour at the speed of sound
Implementation Method 5
equipped with a means for ensuring a low-pressure state relative to the external environment
Implementation Method 6
precise control over vapor flow and temperature
Data Source
AI summary
The invention relates to a vapour generator for the deposition of a metal coating onto a substrate (7), preferably a steel strip, that comprises a vacuum chamber (6) in the form of a housing including a vapour deposition head or ejector (3) in tight communication via a supply duct (4) with at least one crucible (1) containing the coating metal in a liquid form and located outside the vacuum chamber (6), characterised in that the ejector (3) includes a longitudinal slot for the vapour outlet acting as a sonic throat and extending on the entire width of the substrate (7), a filtration medium or a charge loss member (3A) made of a sintered material being provided in the ejector immediately before said slot on the vapour path in order to equalise the flow speed of the vapour exiting the ejector (3) through the sonic throat.