Helical Channel Valve for Stable Differential Pressure Modulation
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Solution Overview
Problem
Prior art valves lack a consistent and accurate linear relationship between differential pressure loss and active channel length, leading to instability and increased maintenance costs in industrial applications, particularly in HVAC and robotic systems.
Innovation Solution
A differential pressure loss valve with a cylindrical hollow section and a channel carrier featuring a continuous cylindrical helical thread, where the channel carrier is movable within the sleeve to create a composite channel with a constant cross-section, allowing for precise control of differential pressure loss and achieving linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If prior art valves use curved channels (e.g., 90 degree curvature) to change flow direction, then the valve can achieve compact geometry, but the differential pressure loss increases 3 to 7 times compared to straight channels
Solution Approach 1:
The patent applies helical curvature to the channel carrier, creating a spiral flow path that gradually changes direction rather than using sharp 90-degree bends. This continuous curvature distributes the pressure loss over a longer path, reducing the intensity of pressure drop at any given point while still achieving flow direction change.
Solution Approach 2:
The invention transitions from planar channel layouts to three-dimensional helical channels that wrap around a central axis. This spatial arrangement allows the fluid to change direction through gradual rotation in multiple dimensions, reducing turbulent losses associated with sharp angular turns in two-dimensional layouts.
2Loss of energy
If prior art valves reduce channel cross-sectional area to increase differential pressure loss, then the valve can achieve higher pressure control, but the differential pressure loss amplification reaches 20 to 1 ratio requiring electronic compensating converters
Solution Approach 1:
The patent achieves differential pressure control by changing the helical channel geometry parameters (pitch, diameter, number of turns) rather than relying solely on cross-sectional area reduction. This provides a more gradual and predictable pressure loss characteristic that can be tuned to match common actuator profiles without requiring electronic compensation.
Solution Approach 2:
The channel carrier is designed to be rotatable relative to the sleeve, allowing dynamic adjustment of the effective channel length and geometry. This mechanical adjustability provides continuous differential pressure control without electronic intervention, enabling the valve to adapt to different flow conditions through pure mechanical means.
3Adaptability or versatility
If prior art valves have non-linear gain characteristics with low gain when open and high gain when closed, then the valve can achieve wide range modulation, but the valve exhibits instability in robotically controlled industrial uses
Solution Approach 1:
The helical channel geometry is pre-configured to provide a more uniform pressure drop characteristic across the valve's operating range. The gradual spiral configuration ensures that each degree of rotation produces a relatively consistent change in flow resistance, preparing the valve for stable robotic control before the control system even engages.
Solution Approach 2:
By changing the channel geometry from sharp-edged restrictions to smooth helical passages, the patent fundamentally alters the pressure-flow relationship. This geometric transformation creates a more linear gain characteristic that maintains stability across the full modulation range, eliminating the need for electronic gain scheduling or compensation.
4Reliability
If prior art valves require electronic compensating converters to achieve linearity, then the valve can achieve acceptable control performance, but the cost and complexity increase significantly
Solution Approach 1:
The patent replaces electronic compensation mechanisms with a mechanically optimized helical channel design. The inherent geometry of the spiral passages provides the linearity and stability that would otherwise require complex electronic converters, achieving the same control performance through purely mechanical means.
Solution Approach 2:
The helical channel carrier automatically provides differential pressure control and linearity correction through its geometric design, without requiring external electronic compensation systems. The structure serves its own control function, eliminating the need for additional electronic components and reducing overall system complexity.
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 a consistent, accurate, and linear relationship between differential pressure loss and active channel length, enhancing stability and reducing setup and maintenance costs in industrial applications by eliminating the need for electronic compensating converters.
Implementation Method 1
differential pressure loss valve comprising: a sleeve incorporating a cylindrical hollow section having a continuous cylindrical helical thread formed in said cylindrical hollow section; a channel carrier incorporating a continuous cylindrical helical thread formed in its outer wall
Data Source
AI summary
The present invention is a differential pressure loss valve comprising a valve housing that incorporates: a sleeve that incorporates a continuous cylindrical helical thread formed in the inner surface thereof; and a cylindrical channel carrier incorporating a cylindrical helical thread formed in the outer surface thereof. When the channel carrier is positioned within the sleeve a portion of the sleeve cylindrical helical thread integrates with the channel carrier cylindrical helical thread, and a composite channel is formed there-between. The geometric configuration of the composite channel is consistent throughout such composite channel, although the geometric configuration may differ in individual embodiments of the present invention. Fluid can flow within the valve between an inlet port incorporated in the sleeve and an outlet port incorporated in the valve housing and through the composite channel, or any portion thereof between the inlet port and outlet port, if any.