Helical Throttle Body Channels for Cavitation-Free Pressure Drop
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Solution Overview
Problem
Existing throttle bodies in process fluid lines face challenges in achieving a strong reduction in fluid pressure with large flow volumes while minimizing wear and cavitation, particularly at high differential pressures and in multiphase flows.
Innovation Solution
A throttle body with a curved channel design that deviates from a flat extension, featuring a three-dimensional spiral shape with a constant or varying pitch and radial distance, which reduces pressure loss primarily through wall friction and avoids cavitation by gradual transitions and continuous curvature, ensuring no internal contour jumps or steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact throttle body design is used, then the device size is reduced, but the ability to achieve strong pressure reduction with large flow volumes is compromised
Solution Approach 1:
The patent transitions from planar channel paths to three-dimensional spiral channels that wind through the throttle body volume. This dimensional change allows the fluid to traverse a much longer path length within a compact external envelope, achieving strong pressure reduction through extended wall friction while maintaining a small throttle body volume.
Solution Approach 2:
The spiral channels are nested within the compact throttle body structure, with the fluid path winding inward and outward through the volume. This nesting approach maximizes the utilization of available space, allowing multiple turns of the spiral path to be contained within a small external dimension while still providing sufficient path length for pressure reduction.
2Device complexity
If straight channels are used, then the flow path is simple and compact, but cavitation occurs due to sudden pressure changes
Solution Approach 1:
The patent replaces straight channels with continuously curved spiral channels. The curved path creates gradual pressure changes as the fluid follows the spiral trajectory, preventing the sudden pressure drops that cause cavitation. The curvature is maintained throughout the entire channel path, ensuring smooth flow transitions.
Solution Approach 2:
The spiral channel design preliminarily prepares the fluid for pressure reduction by gradually increasing the path length and maintaining continuous curvature. This preliminary action distributes the pressure drop along the entire spiral path rather than concentrating it at a single point, preventing cavitation before it can occur.
3Power
If multiple bent channels are used to reduce pressure, then pressure reduction is achieved, but wear increases due to cavitation and shock waves
Solution Approach 1:
The continuously curved spiral channel design eliminates abrupt bends and sharp transitions that generate shock waves and cavitation. The smooth curvature throughout the path ensures gradual pressure reduction without the violent flow separations that cause wear, thereby maintaining reliability while achieving the required pressure reduction.
Solution Approach 2:
The patent converts the potentially harmful effect of extended channel length (which could increase friction and wear) into a beneficial gradual pressure reduction mechanism. The extended spiral path distributes wall friction effects uniformly, avoiding localized high-stress regions that would cause wear, while the continuous curvature prevents cavitation-related damage.
4Ease of manufacture
If planar channel paths are used, then manufacturing is simpler, but the pressure reduction efficiency is insufficient for large flow volumes
Solution Approach 1:
The patent moves from two-dimensional planar channels to three-dimensional spiral channels that utilize the full volume of the throttle body. This dimensional transition allows the channels to wind through the depth and radius of the component, achieving much longer path lengths and higher pressure reduction efficiency while remaining manufacturable through standard casting or machining 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
This design effectively reduces fluid pressure with large flow volumes while minimizing wear and noise, ensuring a smooth flow profile that avoids cavitation and material damage, achieving a significant increase in throttling property and pressure drop.
Implementation Method 1
The pressure reduction in the throttle body is primarily caused by wall friction of the fluid in the grooves
Implementation Method 2
The throttle body thus creates a flow resistance for the process fluid, dissipating some of the fluid's energy, particularly its kinetic and/or pressure energy
Implementation Method 3
The channels according to DE 1 650 196 A deviate from a straight line and are curved; however, the channel inlet and outlet, together with the curvature deviating from the inlet-outlet straight line, define a plane in which the entire path of a channel lies
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3~6
AI summary
In a throttling element for reducing fluid pressure, in particular on a control valve, preferably for arrangement in a process fluid line, a process engineering plant, such as a chemical plant, in particular a petrochemical plant, a power plant, a brewery or the like, with several channels (41) extending from an upstream channel inlet (43) to a downstream channel outlet (45), it is provided that at least one of the several channels between the channel inlet (43) and the channel outlet (45) has a curved course that deviates from a planar extent, at least in part.