Turbo Machine Rotor Locking Sheet Deformation Prevention
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Solution Overview
Problem
In turbo machines, the locking sheet is prone to deformation or damage when a wedge is installed in the disk slot, which compromises the axial force needed to prevent relative movement between the blade and the disk, especially during low-speed operation when centrifugal force is weak.
Innovation Solution
A rotor design that includes a disk with a disk slot, a blade with a root member and airfoil, a locking sheet inside the root member, and a fixing portion to securely attach the locking sheet to the root member, preventing deformation by supporting the locking sheet from the inner side and maintaining contact with the wedge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a wedge is installed in the disk slot to prevent relative movement between blade and disk, then the axial force is improved, but the locking sheet is deformed or damaged
Solution Approach 1:
The locking sheet is preliminarily set in position within the disk slot before the wedge is installed. This preliminary positioning ensures that the locking sheet is properly aligned and secured, preventing deformation or damage when the wedge is subsequently installed to provide axial force.
Solution Approach 2:
The locking sheet acts as an intermediary element between the wedge and the blade root. It distributes the axial force from the wedge across a larger area of the blade root, preventing stress concentration that could deform or damage the locking sheet while still maintaining the necessary axial force.
2Ease of manufacture
If clearance is designed between root member and disk slot for assembly and thermal expansion, then ease of manufacture is improved, but relative movement occurs at low speed
Solution Approach 1:
The locking sheet serves as an intermediary that fills and secures the clearance between the root member and disk slot. It prevents relative movement during low-speed operation while still allowing the necessary assembly clearance and thermal expansion during manufacturing and operation.
Solution Approach 2:
The locking sheet is strategically positioned in specific regions where clearance exists between the root member and disk slot. It provides localized stabilization in these critical areas without restricting the overall assembly clearance needed for manufacturing and thermal expansion.
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 solution effectively prevents deformation and damage to the locking sheet, ensuring consistent axial force and preventing relative movement between the blade and disk, even at low speeds, thereby enhancing the operational stability and longevity of the turbo machine.
Implementation Method 1
During the operation of a turbo machine, each blade is in close contact with the disk due to strong centrifugal force, preventing the blade from moving in the turbine disk slot. However, during a period when the turbo machine is stopped, the rotor rotates at a low speed and the centrifugal force applied to the blades weakens.
Data Source
AI summary
A rotor and a turbo machine including the same are provided. The rotor includes a disk including a disk slot, a blade including a root member inserted into the disk slot and an airfoil disposed outside the root member in a radial direction of the disk, a locking sheet disposed inside the root member in the radial direction, and a fixing portion disposed inside the root member in the radial direction and configured to fix the locking sheet to the root member.