Fluid Pump Radial Seal Offset for Shaft Vibration Control
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Solution Overview
Problem
Conventional water pumps experience shaft vibration, leading to inconsistent surface pressure and potential leakage due to the linear arrangement of bearings and seal means, which limits compactness and efficiency.
Innovation Solution
The fluid pump design features a bearing and sealing mechanism where the load support plane and sealing plane are perpendicular to the axial direction, with the sealing means positioned inside the bearing, reducing relative oscillation and maintaining constant pressure, allowing for a more compact and leak-tight configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bearing and seal means are disposed in a line along the axial direction, then the structure is simple and easy to manufacture, but shaft vibration occurs causing leakage and the pump cannot be made compact
Solution Approach 1:
The patent repositions the seal means from a linear axial arrangement to a radial arrangement relative to the bearing. Specifically, the seal means is disposed offset from the axial line of the bearing, creating a radial offset configuration. This dimensional change eliminates shaft vibration-induced leakage while maintaining manufacturing simplicity, as the seal means remains accessible and the overall structure does not become significantly more complex.
2Device complexity
If the bearing and seal means are disposed in a line along the axial direction, then the structure is simple, but the pump shaft axial dimension cannot be reduced preventing compactness
Solution Approach 1:
The patent repositions the seal means from a linear axial arrangement to a radial arrangement relative to the bearing. Specifically, the seal means is disposed offset from the axial line of the bearing, creating a radial offset configuration. This dimensional change eliminates shaft vibration-induced leakage while maintaining manufacturing simplicity, as the seal means remains accessible and the overall structure does not become significantly more complex.
3Ease of manufacture
If the bearing and seal means are disposed in a line along the axial direction, then the structure is simple and easy to manufacture, but relative oscillation occurs between seal members causing leakage
Solution Approach 1:
The patent repositions the seal means from a linear axial arrangement to a radial arrangement relative to the bearing. Specifically, the seal means is disposed offset from the axial line of the bearing, creating a radial offset configuration. This dimensional change eliminates shaft vibration-induced leakage while maintaining manufacturing simplicity, as the seal means remains accessible and the overall structure does not become significantly more complex.
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 effectively prevents liquid leakage from shaft oscillation and enables a more compact, lighter, and cost-effective pump by minimizing relative oscillation between seal members and maintaining constant surface pressure.
Implementation Method 1
When the impeller rotates, cooling water is drawn in from the inlet, forced out to the periphery by centrifugal force, and is expelled from the outlet into the water jacket
Data Source
AI summary
A pump pulley is supported on a pump body via a bearing interposed between the outer peripheral surface of the pump body and the pump pulley so that the pump pulley can freely rotate relative to the pump body. A pump shaft extends along the rotation axis of the pump pulley into a pump chamber formed by a pump base and the pump body, and one end of the pump shaft is fitted to the pump pulley and the other end is fitted to an impeller located within the pump chamber. A body side seal member and a shaft side seal member that form a mechanical seal to maintain the leak tightness of the pump chamber are in opposite to and contact each other in the direction of extension of the pump shaft to form a seal surface, and the plane that includes the load support center of the bearing and the plane that includes the seal surface of the mechanical seal are substantially coincidental.