Rotary Machine Fixture Backlash Prevention
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Solution Overview
Problem
Existing rotary machine fixtures require a large number of components, increasing the size and cost of the rotary machine and complicating maintenance, while failing to effectively prevent backlash between the rotary and stationary units during transportation, which can damage the dry gas seal and impair machine performance.
Innovation Solution
A minimized fixture configuration that includes a plate integrated with the rotary shaft, fixed by a fastening member and constrained by a constraining member to prevent axial and rotational movement relative to the stationary unit, using a bolt to secure the journal bearing and prevent backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixture with both radial direction fixture and rotation direction fixture is used to prevent backlash, then backlash prevention reliability is improved, but device complexity and number of components increase
Solution Approach 1:
The patent combines the radial direction fixture and rotation direction fixture into a single integrated fixture structure. The fixture includes a fixing member that simultaneously provides both radial positioning and rotational positioning functions, eliminating the need for separate fixtures for each direction and reducing the total number of components while maintaining reliable backlash prevention
Solution Approach 2:
The fixture is designed as a multi-functional component that performs multiple functions: it provides radial direction support, rotation direction support, and backlash prevention all through a single integrated structure. This universal design allows one fixture to replace what would traditionally require multiple separate components
2Device complexity
If a minimized fixture configuration is used to reduce device complexity, then device complexity and cost are reduced, but backlash prevention capability may be compromised
Solution Approach 1:
The minimized fixture configuration merges the radial and rotational constraint functions into a single integrated structure with strategically positioned constraint surfaces. This merging allows the fixture to maintain full backlash prevention capability while using fewer components, achieving both simplicity and reliability simultaneously
Data Source
AI summary
A fixture used in a rotary machine which includes a rotary unit which has a rotary shaft, and a stationary unit which rotatably supports the rotary shaft, includes: a plate which comes into contact with an end portion of the rotary shaft; a fastening member which fixes the plate to the end portion of the rotary shaft; and a constraining member which connects the plate and the stationary unit, and constrains the plate from moving with respect to the stationary unit in an axial direction and a rotation direction.