Pump Bush Retention with Offset Recesses and Push-Fit Assembly
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Solution Overview
Problem
Existing bush retention systems in magnetic drive pumps require complex interference fitting and specialized equipment, which is difficult to implement in the field and necessitates multiple metallurgies and interference fits to accommodate varying temperatures and process liquid compatibility.
Innovation Solution
A bushing system with axially offset recesses and a compliant retention member that provides a biasing force to secure the bush in the bush holder, eliminating the need for interference fitting and allowing for a simple push fit assembly, while ensuring proper alignment and preventing rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference fitting is used to retain the bush in the bush holder, then the bush is rigidly fixed and retained, but the system requires complex metallurgies and specialized equipment that is difficult to implement in the field
Solution Approach 1:
The retention system is segmented into distinct functional elements: axially offset recesses in the bush holder and bush, and a separate retention member. This segmentation allows each component to be simpler while collectively achieving reliable retention without complex interference fits.
Solution Approach 2:
A retention member acts as an intermediary element between the bush holder and the bush. This intermediary component simplifies the direct interface by providing a dedicated retention mechanism that does not require complex metallurgical relationships between the bush holder and bush.
2Reliability
If interference fitting is used to retain the bush, then the bush is securely fixed, but specialist equipment and complex procedures are required for assembly and field servicing
Solution Approach 1:
By segmenting the retention function into offset recesses and a separate retention member, the assembly process is simplified to basic positioning and retention member installation, eliminating the need for specialized interference fitting equipment.
Solution Approach 2:
The design changes the retention mechanism from relying on interference fit parameters (material properties, fit tolerances) to geometric parameters (axial offset distance, retention member dimensions), which are easier to control and implement with standard manufacturing processes.
3Adaptability or versatility
If multiple metallurgies and interference fits are employed to accommodate varying temperatures and process liquid compatibility, then the system can operate over a wide range of conditions, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The axially offset recess and retention member mechanism serves as a universal retention system that can accommodate different bush materials and temperature conditions without requiring different retention mechanisms. The same geometric principle works across multiple metallurgical combinations.
Solution Approach 2:
The complex metallurgical requirements for retention are extracted from the bush-bush holder interface and transferred to the retention member selection. This allows the primary bush holder and bush to use simpler, more compatible material combinations while the retention member handles the retention function independently.
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
Simplifies assembly and maintenance, reduces the need for specialized equipment, and allows a single bush holder size to fit various applications, enhancing operational reliability and ease of field servicing.
Implementation Method 1
The retention member may be compliant. The retention member and the axially offset recesses may combine to provide a biasing force which urges the bush and bush holder towards each other.
Data Source
AI summary
A bushing system for use in a magnetic drive or canned motor pump, the system comprising: a bush holder having an axial recess for receiving a bush, a bush for insertion into the axial recess, the bush and bush holder each having: one or more cooperating features which abut against each other when the bush is fitted into the recess; and a recess for receiving at least part of a retention member; wherein, when the cooperating features abut, the retention member recesses on the bush holder and the bush are axially offset.