Turbine Casing Eccentric Shaft Vertical Adjustment

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Solution Overview

Problem

Conventional turbine casing structures face challenges in adjusting the position of the inner casing with respect to the outer casing in the up-and-down direction, requiring disassembly and machining, which impairs efficiency and increases operational costs.

Innovation Solution

A turbine casing structure featuring an eccentric shaft with a shaft center on both ends, allowing for external adjustment of the inner casing's position via a bush and fixing member, enabling precise vertical alignment without disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional positioning mechanisms (torque pins and horizontal keys) are used to support the inner casing, then the inner casing is fixed in position, but the position cannot be adjusted from the outside without disassembly and machining

Engineering Contradiction:

Improveadjustability of inner casing positionVSAvoidcomplexity of positioning mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The positioning mechanism is transformed from a static fixed structure to a dynamic adjustable structure. The inner casing position can be adjusted vertically by operating the positioning mechanism from the outside through the communication hole, converting the static torque pins and horizontal keys into an adjustable system that responds to external operations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A communication hole is introduced as an intermediary channel between the outside environment and the interior positioning mechanism. This allows external operators to adjust the inner casing position without disassembling the casing, mediating between the external adjustment need and the internal positioning structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If the inner casing position is adjusted by disassembly and machining of horizontal keys, then precise alignment is achieved, but work efficiency decreases and operational costs increase

Engineering Contradiction:

Improvealignment precision of inner casingVSAvoidwork efficiency of adjustment operation

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The positioning mechanism is designed to be self-adjustable from the outside. The mechanism includes components that can be operated through the communication hole, allowing the system to adjust its own position without requiring external disassembly and machining operations, thereby maintaining precision while improving efficiency.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The positioning mechanism is pre-configured with adjustable components that can be operated from the outside. This preliminary design allows future adjustments to be made without disassembly, preparing the system in advance for efficient repositioning when alignment precision needs to be modified.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If torque pins and horizontal keys are used for positioning, then the inner casing is securely supported, but adjustment from the outside requires disassembly

Engineering Contradiction:

Improvesupport stability of inner casingVSAvoidexternal adjustability of positioning

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The positioning mechanism is segmented into multiple functional components: torque pins for lateral positioning, horizontal keys for vertical positioning, and a communication hole for external access. This segmentation allows the system to maintain secure support through the pins and keys while enabling external adjustment through the separate communication hole channel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The communication hole serves as an intermediary that connects the external environment to the internal positioning mechanism. It allows operators to access and adjust the positioning components from outside the casing without compromising the structural integrity or support stability provided by the torque pins and horizontal keys.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables efficient external adjustment of the inner casing's position relative to the outer casing, improving work efficiency and allowing for accurate alignment, thereby reducing operational costs and complexity.

Implementation Method 1

an eccentric shaft inserted into a communication hole formed in the outer casing, and having a front end disposed in contact with the bush

Methodology Applied

Scientific EffectEccentric mechanism: Eccentric

Data Source

PatentUS20090226313A1Turbine casing structure

Publication Date: 2009.09.10 MITSUBISHI POWER LTD

AI summary

A turbine casing structure having an outer casing, and an inner casing disposed in the outer casing, comprising:a bush disposed in a concave portion formed in the inner casing;an eccentric shaft inserted into a communication hole formed in the outer casing, and having a front end disposed in contact with the bush; anda fixing member disposed in engagement with the eccentric shaft, and fixed to the outer casing.