Rotary Pump Radially Movable Elements Bidirectional Flow
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Solution Overview
Problem
Rotary pumps have high manufacturing and operational costs due to high wear and leakage issues, limiting their suitability for pressures beyond 300 bar.
Innovation Solution
A rotary pump design featuring a displacement rotor with radially movable displacement elements that form fluid displacement chambers with the pump housing, allowing fluid to be delivered between two fluid connections by reversing the direction of rotation, thus enhancing efficiency and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotary pump is designed to deliver fluid in one direction only, then the structure is simple, but two separate pumps are needed for bidirectional fluid delivery, increasing cost and complexity
Solution Approach 1:
The rotary pump is designed with displacement elements that can move radially outward to form displacement chambers, enabling the same pump structure to deliver fluid in both forward and reverse directions. The pump housing includes first and second fluid connections that both open into the displacement chamber, allowing bidirectional fluid delivery without requiring separate pumps for each direction.
2Productivity
If displacement elements are made radially movable to form displacement chambers, then fluid delivery efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The displacement elements are designed to be radially movable rather than fixed, allowing them to dynamically adjust their position to form displacement chambers between the rotor and stator. This dynamic capability enables efficient fluid displacement while the guide structures and radial movement constraints maintain positioning precision without requiring extremely tight manufacturing tolerances.
3Reliability
If the pump uses conventional rotary vane design, then it can deliver low-viscosity fluids, but wear and leakage increase at pressures above 300 bar
Solution Approach 1:
The pump divides the displacement chamber into multiple segments using radially arranged displacement elements that create separate displacement chambers between adjacent elements. This segmentation allows each chamber to maintain pressure independently, reducing overall leakage and wear while handling pressures above 300 bar more effectively than conventional rotary vane designs.
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 design enables efficient fluid delivery in both directions with a single rotary pump, reducing manufacturing and operational costs, and increasing the pump's pressure handling capability.
Implementation Method 1
displacement elements for delivering the fluid, which are distributed over the circumference of the displacement rotor and are radially movable with respect to the axis of rotation (D)
Data Source
AI summary
A rotary pump for delivering a fluid includes a pump housing having a first and a second fluid connections, wherein the first and the second fluid connections each open into a displacement chamber of the pump housing, a displacement rotor arranged in the displacement chamber, rotatable about an axis of rotation (D) in a first direction of rotation and a second direction of rotation opposite to the first direction of rotation, a plurality of displacement elements for delivering the fluid, distributed over the circumference of the displacement rotor, radially movable with respect to the axis of rotation (D), and designed to deliver the fluid from the first to the second fluid connection when the displacement rotor is rotated in the first direction of rotation, and to deliver the fluid from the second fluid connection to the first fluid connection when the displacement rotor is rotated in the second direction of rotation.