Rotary Pressure Transfer Device Flow Control
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Solution Overview
Problem
Rotary pressure transfer devices face challenges in minimizing mixing between high and low-pressure liquids, which can lead to efficiency reductions and complex control requirements, especially during fluctuations in flow rates.
Innovation Solution
The design incorporates oblique ramps only in the high-pressure inlet and discharge passageways, while low-pressure liquid flows in a straight longitudinal direction, minimizing mixing and stabilizing rotor speed with consistent high-pressure flow, and optionally using reverse-oriented ramps in low-pressure passageways to counteract rotor rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If oblique ramps are included in both high-pressure and low-pressure passageways to drive rotor rotation, then rotor rotation efficiency is improved, but mixing between high-pressure and low-pressure liquids increases
Solution Approach 1:
The device segments the flow control function by providing separate oblique ramps only in the high-pressure passageways while keeping low-pressure passageways straight. This segmentation allows the high-pressure stream to drive rotor rotation through its oblique ramps while the low-pressure stream flows longitudinally without creating mixing-inducing oblique flows, thus resolving the contradiction between rotation efficiency and liquid mixing prevention
Solution Approach 2:
The invention applies local quality by making the passageway geometry location-specific: oblique ramps are localized to the high-pressure inlet and discharge passageways where rotation-driving force is needed, while low-pressure passageways maintain straight longitudinal geometry to prevent mixing. This localized differentiation allows each region to perform its specific function optimally without interfering with the other
2Object-generated harmful factors
If pistons or separators are disposed in rotor channels to prevent mixing, then mixing between liquids is minimized, but device complexity and control requirements increase
Solution Approach 1:
The invention extracts and eliminates the need for complex pistons or separators by replacing them with a simpler geometric solution: oblique ramps in the high-pressure passageways. This extraction removes the harmful mixing effect without requiring the complex mechanical components and control systems that would be needed to manage piston movement and prevent slamming, thus resolving the contradiction between mixing prevention and device simplicity
Solution Approach 2:
The invention substitutes the mechanical piston or separator system with a passive geometric flow control solution using oblique ramps. This replacement eliminates the need for complex mechanical components and their associated control systems while still achieving the goal of minimizing liquid mixing through clever passageway geometry design
3Stability of the object's composition
If oblique ramps are used in high-pressure passageways to drive rotor rotation, then rotor speed stability is improved, but the risk of cavitation and pressure shock increases during flow fluctuations
Solution Approach 1:
The invention applies preliminary anti-action by designing the high-pressure passageways with oblique ramps that consistently drive rotor rotation in one direction, while the straight low-pressure passageways provide a counterbalancing longitudinal flow that stabilizes the system. This pre-configured geometric arrangement creates a natural balance that prevents excessive rotor speed variations and mitigates the risk of cavitation and pressure shock during flow fluctuations
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 configuration enhances flow rate and minimizes mixing, reduces the risk of cavitation and pressure shock, and allows for efficient flushing and desalination operations without compromising rotor speed, while maintaining control over rotor rotation.
Implementation Method 1
direct both high- and low-pressure incoming liquid obliquely at the rotor channels to create impact force in the channels that induces rotation
Implementation Method 2
a first fluid, under a high pressure, hydraulically communicates with a second, lower pressure fluid to transfer pressure between the fluids and produce a high pressure discharge stream of the second fluid
Data Source
AI summary
A rotary pressure transfer device utilizes a multi-channel, generally cylindrical rotor (15) that revolves with its flat end faces juxtaposed with flat end surfaces of a pair of flanking end covers (19, 21) in which inlet and outlet passageways are provided. The design is such that there are only oblique ramps (65) in the passageways on the high pressure side which create directional flow of liquid to cause rotor revolution in the desired direction. Passageways (27a, 27b) on the low pressure side may be shaped so that there is essentially axial or longitudinal flow entry and discharge of liquid between the channels and the passageways, or passageways (71) may be constructed to create directional flow that slightly retards rotor revolution in such desired direction.