Flexible Impeller Tubular Insert Key Alignment
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Solution Overview
Problem
Flexible rubber impeller pumps in the marine industry face premature failure due to wear and deterioration, especially in adverse environments, and maintenance is complicated by corrosion and deposits between the impeller insert and shaft.
Innovation Solution
A removably mounted impeller assembly with a tubular insert and key portion that restricts shaft rotation, allowing for easy maintenance and replacement, even in cramped spaces, by aligning the axial groove and key portion to prevent misalignment and facilitate single-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the impeller is permanently fixed to the shaft, then the structural integrity is improved, but the ease of maintenance and replacement deteriorates
Solution Approach 1:
The impeller assembly is segmented into a removable impeller component and a shaft component, allowing the impeller to be detached for maintenance while keeping the shaft intact. This segmentation enables easy replacement of the impeller without affecting the overall structural integrity of the pump system.
Solution Approach 2:
The impeller is pre-configured with mounting features (such as keys or splines) that align with corresponding features on the shaft, allowing for quick and accurate reinstallation. This preliminary preparation of alignment features speeds up the maintenance process while ensuring proper structural connection when reassembled.
2Ease of repair
If the impeller is made removable for easy maintenance, then the ease of repair is improved, but the reliability deteriorates due to potential misalignment
Solution Approach 1:
The impeller and shaft incorporate asymmetric keyways or splines that provide a unique orientation, ensuring that the impeller can only be installed in the correct rotational position. This asymmetric design prevents misalignment while maintaining ease of removal and reinstallation for maintenance purposes.
Solution Approach 2:
The alignment features (keys, splines, or indexing marks) are designed to automatically guide the impeller into the correct position during reinstallation, eliminating the need for complex alignment procedures. The components self-align through their geometric features, ensuring reliable positioning without requiring specialized tools or expertise.
3Ease of operation
If the impeller is designed for single-handed operation, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The impeller incorporates a flexible blade design that allows it to flex during operation and during installation/removal. This flexibility enables the impeller to be manipulated with one hand, as the blades can bend to clear obstacles or fit into tight spaces, simplifying maintenance operations without requiring complex mechanical assistance.
Solution Approach 2:
A simple intermediary element such as a snap-fit mechanism or elastic retaining ring is used to secure the impeller to the shaft. This intermediary component provides a secure connection during operation but allows for easy one-handed release and removal, balancing operational security with maintenance convenience without adding significant complexity.
Data Source
AI summary
Embodiments of the invention provide an impeller assembly having a flexible impeller and a method of replacing a removable drive mechanism. The impeller assembly includes an impeller having an outer portion defining a substantially cylindrical shape, at least one flexible blade extending radially outward from the outer portion, and a first bore extending a first axial length. The impeller assembly also includes a tubular insert supported at least partially within the first bore. The tubular insert has a second bore defining a substantially cylindrical shape with a first radial distance from an axis passing through the center of the impeller, and a key portion radially extending from the second bore. The key portion defines a second radial distance from the axis larger than the first radial distance.