Propeller Pump Blade Trimming for Precise Duty Point Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional propeller pumps face challenges in accurately adjusting the pitch angle of adjustable blades during assembly, leading to inefficiencies and increased lead time, while fixed-blade propellers require numerous configurations to cover various applications, resulting in compromises on duty points and efficiency.
Innovation Solution
A method for manufacturing propellers with fixed blades that involves axial trimming to adapt to specific applications, allowing for precise adjustment of the duty point without changing the radial dimensions, thus reducing the number of required propeller configurations and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjustable blades are used to adapt to different applications, then the duty point can be precisely adjusted, but the assembly process becomes complicated and lead time increases
Solution Approach 1:
The blade pitch angles are pre-calculated and pre-marked on the blade surfaces during manufacturing. This preliminary action eliminates the need for complex iterative adjustment during assembly, as installers only need to align the blade with the marked angular positions corresponding to the desired duty point, significantly reducing assembly lead time while maintaining adaptability.
Solution Approach 2:
The adjustable blade mechanism is segmented into discrete angular positions with corresponding duty point markings. Each blade can be independently positioned at specific angular increments, allowing precise duty point selection without requiring continuous adjustment, thereby simplifying the assembly process while preserving adaptability across different applications.
2Loss of time
If fixed blades are used to reduce assembly complexity, then lead time decreases, but numerous propeller configurations are required to cover different applications
Solution Approach 1:
A single propeller design with fixed blades incorporates multiple universal angular position markings that can accommodate various duty points. The blade geometry and marking system are designed to be multi-functional, allowing the same propeller configuration to serve different applications by selecting appropriate angular positions, thereby reducing the need for multiple specialized propeller designs.
Solution Approach 2:
The invention changes the parameter approach from varying blade geometry across multiple propeller designs to varying the angular position parameter of fixed blades. By maintaining consistent blade geometry and introducing angular position markings, the system achieves adaptability through parameter variation rather than structural changes, reducing the number of required configurations.
3Ease of manufacture
If fixed blades with limited configurations are used, then manufacturing is simplified, but compromises must be made on duty point precision
Solution Approach 1:
During the manufacturing process, precise angular markings are pre-applied to the blade surfaces indicating the optimal angular positions for achieving specific duty points. This preliminary action ensures manufacturing precision is maintained, as the markings guide both the manufacturing tolerance and the final installation positioning, eliminating the need for post-assembly adjustments while keeping manufacturing processes simple.
Data Source
AI summary
A method for manufacturing a propeller for a propeller pump includes providing a base propeller including a hub extending from an axial end in the axial direction, and a plurality of blades fixedly connected to the hub, each blade including a pressure side, a suction side, a leading edge, an initial trailing edge, and a blade tip extending from the leading edge to the initial trailing edge at the end of the blade facing away from the hub, trimming each of the blades of the base propeller the axial direction, and forming a modified trailing edge bye removing a part of the initial trailing edge along the entire pressure side from the hub to the blade tip.