Cartridge Mechanical Seal Alignment Without Setting Clips
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Solution Overview
Problem
Traditional cartridge mechanical seals require supplementary setting components, which can lead to side loading and misalignment, reducing seal life and increasing installation dangers due to the need for precise handling and removal of clips or screws.
Innovation Solution
A cartridge seal design utilizing a Teflon setting device and a pilot register within the gland to limit side loading, with a composite setting piece press-fitted between the bushing section and drive collar, eliminating the need for screws or clips and ensuring all components are aligned perpendicular to the pump shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional setting clips or screws are used to pre-set the seal, then the seal components can be aligned, but side loading occurs and misalignment happens, reducing seal life
Solution Approach 1:
The invention removes the traditional setting clips and screws from the seal assembly, extracting the problematic alignment components that caused side loading and misalignment. The seal faces are designed to be self-aligning through the pump shaft and seal chamber geometry, eliminating the need for supplementary setting hardware that compromised reliability.
Solution Approach 2:
The seal assembly is designed to self-align through the inherent geometry of the pump shaft, seal chamber, and seal faces. The flat face on the pump shaft and the corresponding seal chamber features work together to automatically position the seal components perpendicular to the shaft centerline without requiring external setting clips or screws.
2Manufacturing precision
If setting clips or screws are used for pre-setting, then alignment can be achieved, but installation complexity and danger increase due to the need for precise handling and removal
Solution Approach 1:
The invention extracts the supplementary setting clips and screws from the installation process, eliminating the need for installers to handle, position, and later remove these components. This simplifies the installation procedure and removes the associated dangers of improper handling or forgotten removal.
Solution Approach 2:
The seal assembly self-aligns through the pump components during normal installation, requiring no special setting clips or screws to be installed or removed. The design allows the seal to automatically position itself perpendicular to the shaft centerline through the inherent geometry of the seal chamber and shaft features.
3Ease of operation
If expendable plastic clips are used to preload seal faces, then installation is simplified, but the seal can move slightly on the stuffing box face, worsening alignment
Solution Approach 1:
The invention removes expendable plastic clips and any supplementary setting components from the design, eliminating the problem of seal movement on the stuffing box face. The seal is designed to maintain its position through the pilot register and the self-aligning geometry of the pump shaft and seal chamber.
Solution Approach 2:
The seal assembly self-positions and self-aligns through the inherent geometry of the pump components without requiring expendable clips or other setting devices. The flat face on the pump shaft, seal chamber features, and register work together to automatically maintain precise alignment during operation.
Data Source
AI summary
A mechanical seal of the cartridge type. A rotary subassembly including a sleeve, the sleeve packed against and adapted to be in sealing disposition with a pump shaft of a pump; a stationary subassembly for attachment to a stuffing box of the pump, the stationary subassembly including a gland, wherein the gland has a front face and back face; and, a register defined within the gland front face, the register being an opening shaped to fit over a raised face of the stuffing box, thereby limiting side loading of the seal. In addition, a composite setting piece press-fitted into a bore between the bushing section and the drive collar, thereby allowing the seal to be preset in lieu of a screw or clip.