Mechanical Seal Flange Locking for Wear Sensing and Anti-Rotation
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Solution Overview
Problem
Existing mechanical seals can twist in stationary components, leading to potential shear-off of position sensors and leakage due to wear, which is not effectively addressed by current designs.
Innovation Solution
A mechanical seal with a flange that forms radially inward and outward projections to prevent rotation and secure the seal ring, combined with a position sensor for wear detection, and optionally a speed sensor, ensuring the seal ring's axial movement compensates for wear and maintains sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position sensor is provided in the mechanical seal, then wear detection capability is improved, but the risk of sensor shear-off due to housing rotation increases
Solution Approach 1:
The patent transitions from a purely radial mounting approach to incorporating axial dimension elements through the flange structure. The flange extends axially from the housing and provides a dedicated mounting surface that is spatially separated from the rotational stress zone, thereby securing the position sensor against shear-off while maintaining wear detection functionality
Solution Approach 2:
The flange acts as an intermediary element between the housing and the position sensor. It provides a stable mounting interface that isolates the sensor from the rotational forces experienced by the housing, thereby protecting the sensor while enabling its function
2Reliability
If the housing is tightly wrapped in the stationary component, then sealing effectiveness is improved, but unintentional rotation of the housing occurs
Solution Approach 1:
The flange features asymmetric radial projections that engage with corresponding features in the stationary component. This asymmetric geometry creates a mechanical interlock that prevents rotational movement while maintaining the tight wrap necessary for sealing effectiveness
Solution Approach 2:
The flange structure segments the housing into functional zones: the circumferential part maintains sealing contact with the stationary component, while the flange extension provides rotational stability through radial projections. This segmentation allows each part to optimize its specific function without compromising the other
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
Prevents unintentional rotation of the seal housing, maintains sealing effectiveness by compensating for wear through axial displacement, and allows for accurate wear and speed monitoring, enhancing the mechanical seal's durability and reliability.
Implementation Method 1
a spring element (23) by means of which the mechanical seal ring (4) is pressed in the axial direction against the mating ring (25)
Data Source
AI summary
The disclosure relates to a mechanical seal for sealing at least one fluid-carrying channel and/or space extending in a stationary component and/or a rotating component from the environment,having a seal ring which is supported in a sealing manner in the axial direction against a mating ring and, to compensate for wear on its end sealing surface or on a mating face, is supported against the mating ring elastically and movably in the axial direction with this sealing surface;having a housing which movably accommodates the mechanical seal ring in the axial direction and encloses the mechanical seal ring with a circumferential part in the circumferential direction. The mechanical seal according to the disclosure, characterized in that the housing has a flange which adjoins the circumferential part in the axial direction and which is integrally formed with the circumferential part or is connected to the circumferential part by a material bond, wherein the flange forms at least one radially inwardly facing projection and the mechanical seal ring has a stop face opposite the radially inwardly facing projection in the axial direction, with which the mechanical seal ring strikes against the projection during a maximum permissible movement in the axial direction, and the flange forms at least one radially outwardly facing projection with which it can be connected or is connected non-rotatably to one of the two components holding the housing.