Mechanical Seal Flange Structure for Anti-Rotation Wear Sensing
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Solution Overview
Problem
Existing mechanical seals for fluid-carrying channels and spaces are prone to unintentional rotation, which can lead to the detachment of position sensors and leakage due to wear, particularly in applications where a stationary sensor is sheared off from the housing.
Innovation Solution
A mechanical seal design featuring a flange that secures the sliding ring against rotation and houses a position sensor, with a flange that forms radially inward and outward projections to prevent housing rotation and secure the sensor, ensuring the sliding ring remains stationary and compensates for wear through axial displacement, while a position sensor detects the axial movement for wear evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mechanical seal housing is surrounded tightly by a stationary component, then sealing effectiveness is improved, but the housing can twist unintentionally causing sensor detachment
Solution Approach 1:
The flange acts as an intermediary element between the housing and the stationary component. It provides a dedicated interface with rotation-preventing features (such as keys, splines, or asymmetric mounting) that explicitly prevents unintentional rotation while maintaining the tight surrounding structure needed for sealing effectiveness.
Solution Approach 2:
The flange extends the housing structure in a new dimensional direction (radially outward), creating a separate functional zone for rotational constraint. This allows the sealing surface to remain tightly surrounded while the flange perimeter provides rotation prevention through features like keyways or asymmetric mounting holes.
2Duration of action of stationary object
If wear compensation through axial displacement is implemented, then seal durability is improved, but position sensor accuracy must be maintained
Solution Approach 1:
The flange serves as a stable reference frame and mounting platform for the position sensor. By providing a rigid, rotation-free interface between the sensor and the moving components, it ensures that sensor measurements remain accurate even as the sliding ring displaces axially to compensate for wear.
Solution Approach 2:
The system is segmented into a stable reference portion (flange with mounted sensor) and a moving portion (sliding ring with encoder). This separation allows the sensor to remain in a fixed, stable position while the encoding element moves with the sliding ring, enabling continuous wear measurement without compromising sensor accuracy.
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 design effectively prevents housing rotation, maintains seal integrity by compensating for wear, and allows for accurate wear detection, thereby preventing leaks and ensuring reliable sealing in rotating and stationary components.
Implementation Method 1
the slide ring is movable in the axial direction and is elastically supported with its front sealing surface against the mating ring to compensate for the wear
Implementation Method 2
a sensor in the form of a magnet is provided, which is also supported on the stop surface or rests against it and forms a position sensor with a stationary sensor connected to the outside of the housing, with which the axial position of the slide ring can be detected
Data Source
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AI summary
The invention relates to a mechanical seal for sealing at least one channel (1) which extends in a stationary component (2) and/or in a rotating component (3) and which conducts a fluid, and/or for sealing a chamber from the environment, which mechanical seal comprises: a slide ring (4), which is sealingly supported in the axial direction on a counter-ring (5), and, in order to compensate for wear on its end-face sealing surface (5) or on a mating surface, is elastically supported so as to move in the axial direction, having said sealing surface against the mating ring; a housing (6), which receives the slide ring movably in the axial direction and a circumferential part (6.1) of which encloses the slide ring in the circumferential direction. The mechanical seal according to the invention is characterized in that the housing has a flange (6.2) which adjoins the circumferential part in the axial direction and is formed as one piece with the circumferential part or is integrally joined to the latter, wherein the flange forms at least one radially inwardly directed projection (7), and the slide ring has a stop surface which lies opposite the radially inwardly directed projection in the axial direction and with which the slide ring bears against the projection in the event of maximum permissible movement in the axial direction, and the flange forms at least one radially outwardly directed projection (9), by way of which it can be joined or is joined such that it is secured against rotation, to one of the two components which receive the housing.