Split Mechanical Seal Assembly with Detent Groove and Overlapping Gland
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Solution Overview
Problem
Conventional split mechanical seal designs face challenges in the insertion of the rotary seal ring due to the O-ring's compression and tendency to 'pop-out', and they often result in out-of-squareness with the shaft, leading to reduced sealing effectiveness and shortened seal life. Additionally, the uneven clamping load from gland bolts causes distortion and reduced sealing performance.
Innovation Solution
The mechanical seal assembly features a rotary seal ring holder with a double-angled lead-in and a detent groove to facilitate easy insertion and maintain perpendicularity of the rotary seal face, and an overlapping gland assembly design to prevent sliding of gland halves, ensuring even clamping and improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the O-ring is compressed to seal the rotary seal face to the holder, then sealing capability is improved, but insertion force requirement increases and the O-ring tends to pop-out
Solution Approach 1:
The holder assembly is pre-assembled and clamped around the shaft before the rotary seal face is inserted. This preliminary action creates a ready-to-receive configuration that guides the rotary seal face into position, reducing the force needed for insertion while maintaining O-ring sealing effectiveness.
Solution Approach 2:
The O-ring serves as an intermediary sealing element between the rotary seal face and the holder. By positioning the O-ring in a groove on the holder's inner surface, it mediates the sealing function while the holder's structure supports the compression force, preventing pop-out while maintaining sealing capability.
2Reliability
If the rotary seal face is inserted into a tight space inside the clamped holder, then sealing effectiveness is improved, but insertion difficulty increases
Solution Approach 1:
The holder assembly is divided into two holder halves that are separated during installation, creating a wide opening for inserting the rotary seal face. After insertion, the holder halves are reassembled and clamped together, providing the tight space configuration for effective sealing while maintaining ease of installation.
Solution Approach 2:
The holder halves are prepared and positioned around the shaft before the rotary seal face insertion. This preliminary configuration creates a receiving space that accommodates the rotary seal face, making insertion easier while ensuring the final tight space configuration for sealing effectiveness.
3Reliability
If the gland bolts are tightened to clamp the gland halves, then sealing capability is improved, but distortion and uneven clamping load occur
Solution Approach 1:
The gland assembly incorporates an asymmetric overlapping configuration where one gland half overlaps the other. This asymmetric design provides structural reinforcement that distributes the clamping load more evenly across the sealing interface, preventing distortion while maintaining sealing capability under bolt tightening.
4Strength
If the gland halves are secured together by screws, then assembly strength is improved, but sliding between gland halves occurs under load
Solution Approach 1:
The gland halves feature curved or rounded overlapping surfaces that interlock together. This curved geometry provides mechanical interlocking that resists sliding between the gland halves under operational loads, while the screw fasteners provide the necessary assembly strength to maintain the connection.
Data Source
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AI summary
A split mechanical composite seal assembly for providing a seal between a rotating shaft and a static surface. The split mechanical composite seal assembly includes first and second axially adjacent annular seal elements. The first and second seal elements each include a sealing edge contacting the shaft to provide a respective seal between the first and second seal element and the shaft. A static housing receives the first and second seal elements and engages the static surface to provide a static stationary seal, while concomitantly providing a flex region that engages the seal elements to form a dynamic seal therewith. A holder assembly receives one seal element and may include a double-angled lead-in to facilitate installation of the seal element. The holder assembly may include a detent groove for receiving and retaining an O-ring disposed about the seal element. The static housing may comprise two mating segments having overlapping surfaces.