Rotary Pump Compact Setting Structure for Adjustable Delivery Volume
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Solution Overview
Problem
Rotary pumps face challenges in reducing design space and weight while maintaining adjustable specific delivery volume, as existing designs often require larger widths due to the arrangement of spring devices and setting structures.
Innovation Solution
The rotary pump design features a spring counter bearing that overlaps with the delivery rotor orthogonally to the spring force, reducing the width by using a shorter lever arm and eliminating lateral appendages, with a setting structure that can be pivoted about a stationary polar axis to adjust delivery volume, and incorporates a setting pressure chamber connected to the high-pressure side to balance spring force and pressure forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the spring device is arranged laterally adjacent to the setting structure with a long lever arm, then the spring force can effectively act on the setting structure, but the width of the rotary pump increases
Solution Approach 1:
The spring counter bearing is positioned in a different spatial dimension (orthogonal direction) relative to the spring force vector, allowing the spring device to act through a shorter lever arm while maintaining effective force transmission to the setting structure, thereby reducing the pump width
Solution Approach 2:
Instead of arranging the spring counter bearing laterally adjacent to the setting structure (conventional approach), the invention inverts the arrangement by positioning the spring counter bearing within the delivery rotor area, orthogonal to the spring force direction, achieving compact width while preserving force effectiveness
2Ease of manufacture
If the setting structure includes lateral appendages for spring support, then the spring device can be mounted, but the design space and weight increase
Solution Approach 1:
The spring counter bearing is integrated directly into the setting structure body without requiring separate lateral appendages, merging the spring support function into the main structure and eliminating additional weight from protruding components
Solution Approach 2:
The lateral appendages are removed from the setting structure design, extracting the unnecessary weight-carrying elements while the spring device is mounted directly on the compact setting structure body
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 achieves a more compact rotary pump with adjustable specific delivery volume, reducing the width and weight while maintaining efficient fluid delivery, and includes a fail-safe feature by aligning the spring force with the maximum delivery volume direction.
Implementation Method 1
The position of the setting structure is given by the equilibrium between the spring force and a setting pressure force generated by the setting pressure
Implementation Method 2
a fluid setting pressure acts on the setting structure counter to the spring force
Data Source
AI summary
A rotary pump exhibiting an adjustable specific delivery volume, the rotary pump including a housing featuring a delivery chamber for a fluid feed; a delivery rotor in the delivery chamber; a setting structure which surrounds the delivery rotor, a spring exerting a spring force which acts on the setting structure in a first setting direction; a setting pressure chamber for applying a setting pressure of a setting fluid, which acts counter to the spring force in a second setting direction, to the setting structure; and a housing abutment, wherein the setting structure includes: a recess on a circumference; and a counter abutment for the housing abutment in the recess.