Steam Injection Heater Regulating Member Seal Design
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Solution Overview
Problem
Direct contact steam injection heaters face challenges in controlling steam flow and maintaining a liquid-tight seal during closed conditions, which affects heat transfer efficiency and steam distribution.
Innovation Solution
A steam diffuser with small diffusion holes arranged in a helical pattern, regulated by a movable member that exposes an increasing number of holes as it moves from a closed to open position, allowing controlled steam flow and maintaining a seal through sealing members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a regulating member is used to control steam flow through diffusion holes, then steam flow control precision is improved, but the complexity of the device increases due to additional sealing mechanisms
Solution Approach 1:
The regulating member is segmented with multiple sealing surfaces (first sealing surface, second sealing surface, and third sealing surface) that interact with corresponding seating surfaces. This segmentation allows independent control of steam flow paths while maintaining sealing integrity, enabling precise steam flow regulation without compromising device simplicity
Solution Approach 2:
The regulating member is designed to be movable between different positions (fully closed, partially open, fully open) where its sealing surfaces dynamically engage or disengage with seating surfaces on the diffuser. This dynamic positioning enables continuous steam flow control while maintaining sealing only when needed, resolving the contradiction between control precision and device complexity
2Reliability
If multiple sealing members are positioned on opposite sides of the discharge region, then reliability of the liquid-tight seal is improved, but the device complexity increases
Solution Approach 1:
Multiple sealing functions are merged into a single regulating member structure that integrates the first sealing surface, second sealing surface, and third sealing surface. This unified approach provides reliable liquid-tight sealing on opposite sides of the discharge region while avoiding the complexity of separate sealing components
Solution Approach 2:
The regulating member serves multiple functions simultaneously: it acts as a flow regulator, provides liquid-tight sealing through its first and second sealing surfaces, and maintains seal integrity through its third sealing surface. This multi-functionality reduces overall device complexity while ensuring reliable sealing
3Stability of the object's composition
If steam diffusion holes are arranged in a helical pattern, then mixing of steam and liquid is improved, but manufacturing precision requirements increase
Solution Approach 1:
The steam diffusion holes are arranged in a helical (curved) pattern around the diffuser rather than in a straight line. This curved arrangement creates a rotating steam distribution pattern that enhances mixing effectiveness while the helical geometry can be manufactured using standard drilling jigs and fixtures, keeping manufacturing precision requirements manageable
4Quantity of substance
If the regulating member moves from closed to open position exposing more diffusion holes, then steam flow quantity is improved, but control precision over small steam flows decreases
Solution Approach 1:
The regulating member is segmented with multiple sealing surfaces that can engage different portions of the diffuser. This allows the system to provide fine control for small steam flows by engaging selective sealing surfaces, while still enabling large steam flow quantities when fully open, thus resolving the contradiction between flow quantity and control precision
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
Enhances mixing of steam and liquid, providing precise control over steam flow and maintaining a liquid-tight seal, thereby improving heat transfer efficiency and temperature control.
Implementation Method 1
Steam radially exits through the plurality of steam diffusion holes at a generally sonic velocity into the liquid flow
Implementation Method 2
The small radial jets of steam into the axial flow of liquid within the combining region enhance mixing of the liquid and steam
Implementation Method 3
The interaction between the seating member and the sealing surface of the regulating member creates an end seal that prevents the flow of steam past the seating member when the regulating member is in its completely closed position
Implementation Method 4
As the regulating member moves away from the closed position, the first sealing member restricts the flow of steam to control the amount of steam reaching the discharge region when the regulating member is at its lower end of travel
Data Source
AI summary
A direct contact steam injection heater that includes a steam diffuser having a plurality of steam diffusion holes that are selectively exposed by a regulating member to control the amount of steam used to heat a liquid. The regulating member is movable within the steam diffuser and the steam diffuser includes a seating member to prevent the flow of steam from the diffuser when the regulating member is in a completely closed, seated position. At least one sealing members selectively exposes the steam diffusion holes in the discharge region of the steam diffuser when the regulating member moves between the open and closed positions. The spacing of the steam diffusion holes along the steam diffuser can be varied depending upon the desired resolution of the steam released as the regulating member moves between its fully closed and fully open position.