Pressure Adjustment Valve for Siloxane Flow Stabilization
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Solution Overview
Problem
The high boiling point of siloxane raw materials, such as octamethylcyclotetrasiloxane, makes it difficult to control the flow rate after vaporization, leading to fluctuations in the glass fine particle deposition characteristics due to pressure pulsation from the liquid raw material pressure feed pump.
Innovation Solution
A raw material supply device with a pressure adjustment valve connected to a location of lower pressure, which reduces pressure fluctuations and removes dissolved gas bubbles, stabilizing the flow rate and vaporization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a liquidraw material pressure feed pump is used to supply liquid siloxane to a liquid MFC, then the flow rate can be controlled, but pressure pulsation occurs causing fluctuations in glass fine particle deposition characteristics
Solution Approach 1:
A pressure adjustment valve is introduced as an intermediary component between the pressure feed pump and the liquid MFC. This valve mediates the pressure fluctuations generated by the pump, smoothing them out before the liquid reaches the MFC, thereby eliminating the pulsation effect that caused deposition characteristic fluctuations.
Solution Approach 2:
The pressure adjustment valve performs preliminary pressure stabilization action before the liquid siloxane enters the liquid MFC. By adjusting and equalizing the pressure in advance, the system prevents pressure pulsation from propagating through the subsequent components, ensuring stable flow rate control.
2Productivity
If high primary pressure is applied to the raw material tank to pressurize liquid siloxane, then the liquid can be supplied to the burner, but the high boiling point of siloxane makes it difficult to control flow rate after vaporization
Solution Approach 1:
The system changes the pressure parameter dynamically through the pressure adjustment valve, which maintains appropriate pressure levels for liquid siloxane supply while preventing excessive pressure that would cause vaporization control difficulties. This parameter modulation enables stable flow rate control despite siloxane's high boiling point.
Solution Approach 2:
The pressure adjustment valve acts as an intermediary that decouples the high-pressure supply system from the flow control system. It allows the pump to maintain high primary pressure for productive material supply while the valve regulates the pressure entering the MFC, preventing vaporization-related flow control issues.
3Manufacturing precision
If the secondary side of the pressure adjustment valve is connected to a location with lower pressure, then pressure fluctuations are reduced, but additional piping complexity is introduced
Solution Approach 1:
The pressure adjustment valve is configured with its secondary side connected to a lower-pressure location, creating a pressure equalization path. This intermediary connection allows pressure fluctuations to be dampened by equalizing pressure differences, achieving stable pressure without requiring complex active control systems.
Solution Approach 2:
The pressure difference between the primary and secondary sides of the valve, which could be considered a harmful fluctuation, is converted into a beneficial pressure equalization mechanism. By connecting the secondary side to a lower-pressure location, the system uses the pressure gradient to stabilize overall pressure fluctuations in the liquid supply line.
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 solution reduces fluctuations in the glass fine particle deposition characteristics by smoothing pressure fluctuations and removing dissolved gas, resulting in a more consistent glass fine particle deposited body.
Implementation Method 1
a liquidraw material pressure feed pump that pressure-feeds a liquidraw material from the liquidraw material tank to a liquidMFC via the liquidraw material pipe
Implementation Method 2
a pressure adjustment valve that is provided on a secondary side of the liquidraw material pressure feed pump in the liquidraw material pipe
Implementation Method 3
a vaporizer that is connected to a secondary side of the liquidMFC, and vaporizes the liquidraw material
Data Source
AI summary
This raw material supply device supplies a raw material for producing glass fine particle deposits, to a burner and includes a raw material tank; a liquid raw material pipe having one end thereof connected to the raw material tank; a liquid raw material pressure feed pump that pumps siloxane, being a liquid raw material, from the raw material tank via the liquid raw material pipe; a pressure adjustment valve provided on a secondary side of the liquid raw material pressure feed pump in the liquid raw material pipe; an MFC for liquid, connected to the other end of the liquid raw material pipe; and an aeration device that is connected to the secondary side of the MFC for liquid and aerates the liquid raw material. The pipe on the secondary side of the pressure adjustment valve is connected to a location having lower pressure than the primary side pressure.