Measuring Jig for Rotary Machine Casing Deformation
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Solution Overview
Problem
In rotary machines, the casing deformation due to heat from working fluids makes it difficult to maintain accurate clearances between internal members and stationary parts, requiring substantial effort and cost for measurement.
Innovation Solution
A measuring jig for rotary machines, comprising casing fixing portions, a main member, arms, and reference surfaces, allows for accurate measurement of casing deformation by comparing pre-operation and post-operation distances between reference surfaces and measurement targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional measuring instruments (lead wire or plastic gauge) are used to measure casing deformation, then measurement can be performed, but substantial effort and cost are required
Solution Approach 1:
The measuring jig is divided into multiple independent components: a base member that attaches to bearing holding portions, multiple arms extending from the base, and reference surfaces at the ends of arms. Each component can be independently positioned and adjusted, allowing complex deformation measurements to be broken down into simple distance measurements between reference surfaces and measurement targets on the casing.
Solution Approach 2:
The measuring jig uses the existing bearing holding portions on the casing as attachment points, eliminating the need for separate mounting structures. The bearing holding portions serve dual purposes: supporting the rotor during operation and providing fixed reference points for the measuring jig, thereby making the existing structure serve the measurement function without additional complexity.
2Measurement precision
If traditional measuring instruments are used to measure clearance between internal members and casing, then clearance can be measured, but substantial effort and cost are required
Solution Approach 1:
The measuring jig is pre-assembled with multiple arms and reference surfaces positioned at specific locations before being attached to the casing. The arms are pre-adjusted to extend in directions orthogonal to the casing surface, and reference surfaces are pre-positioned at known distances from the base member. This preliminary preparation eliminates the need for time-consuming on-site adjustments during the actual measurement process.
Solution Approach 2:
The measuring jig can measure deformation at multiple locations simultaneously by using multiple arms with reference surfaces. The same base member and arm structure can be used to measure clearance between the casing and various internal members (rotor, stationary parts) by simply changing the measurement target, making the device universally applicable to different measurement tasks without requiring multiple separate instruments.
3Temperature
If the casing is deformed by heat after operation, then the casing deformation occurs, but accurate assembly of internal members becomes difficult
Solution Approach 1:
The measuring jig measures the actual deformation parameters of the casing after thermal operation by comparing distances between reference surfaces and measurement targets. These measured parameters (deformation amounts and directions) are then used to adjust assembly parameters such as positioning of internal members, clearance requirements, and tolerance specifications, allowing accurate assembly despite thermal deformation by adapting to the changed physical state of the casing.
Data Source
AI summary
The measuring jig for the rotary machine is a measuring jig for a rotary machine including a casing that extending about an axis, a rotor that is disposed in the casing and extends in an axial direction about the axis, and a plurality of bearings that are disposed at intervals in the axial direction and supports the rotor in the casing. The measuring jig includes a plurality of casing fixing portions that are respectively attachable to and detachable from bearing holding portions to which the bearings are attached in the casing; a main member that extends in the axial direction so as to connect the plurality of casing fixing portions to each other; an arm that extends from the main member in an orthogonal direction orthogonal to the axial direction; and a reference surface that is disposed at a distance from a measurement target part of the casing.