One-Piece Tubular Ring for Pump Shaft Sealing
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Solution Overview
Problem
Existing fluid circulation pump designs face challenges in combining surface treatment for shaft friction with leak-tight fixing of the magnet casing, as surface treatments deteriorate the weld quality and tightness.
Innovation Solution
A metal, tubular, one-piece ring is force-fitted onto the shaft to allow surface treatment and leaktight fixing by welding, comprising a cylindrical central wall with end walls and optional cavities, made of stainless steel, which is welded with annular blanks to create a sealed encapsulation casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the shaft undergoes surface treatment to ensure friction quality with the bearings, then the friction quality is improved, but the quality of the weld of the casing on the shaft deteriorates and the tightness is compromised
Solution Approach 1:
The invention divides the shaft system into two separate components: the shaft itself (which receives surface treatment for friction quality) and the ring (which provides the welding surface for the casing). The ring is force-fitted onto the shaft, separating the friction function from the welding function, thereby resolving the contradiction between friction quality and weld quality.
2Strength
If the ring is force-fitted onto the shaft, then the retention is enhanced, but the manufacturing complexity increases due to the need for precise dimensional control
Solution Approach 1:
The invention employs parameter changes by designing the ring with specific dimensional parameters (internal diameter slightly larger than the shaft diameter at the force-fitting zone) that enable force-fitting. The ratio between the internal diameter of the ring and the diameter of the shaft varies along the length of the ring, with the smallest ratio in the force-fitting zone, creating an interference fit that enhances retention while maintaining manufacturability through controlled parameter variations.
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 solution enables both surface treatment for friction and a leaktight seal, enhancing the retention of the ring around the shaft and improving the overall sealing and operational efficiency of the fluid circulation pump.
Implementation Method 1
The ring (30) is intended to be force-fitted onto a shaft (2)... An interior surface (36) of the clamping element (33) extends towards the centre (35) of the cylindrical part (32), beyond an interior surface (34) of the cylindrical part (32).
Implementation Method 2
welding the blanks within and at the ends of said sleeve, and welding said blanks onto the cylindrical part of said ring
Data Source
Figure 1~7
AI summary
The invention relates to a one-piece, tubular, metallic ring (30) intended to be disposed around a rotating shaft of a rotor of an electric motor of a fluid circulation pump, said ring comprising - a cylindrical part (32), called the welding part, having a cylindrical wall of circular cross-section, and - before being disposed around the rotating shaft, an element (33), called the clamping element, an inner surface (36) of which extends, in a radial direction, towards the center (35) of said cylindrical wall, beyond an inner surface (34) of said cylindrical wall.