Impeller Vane Structure for Thermal Clearance Suppression
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Solution Overview
Problem
Existing rotation devices face challenges in suppressing clearance between vanes and housing, leading to efficiency loss.
Innovation Solution
Incorporating an impeller with vanes protruding in the axial direction, a first wall surface with an inclined surface, and an annular vane plate with an elastic body to press the vanes against the wall surface, thereby maintaining contact despite thermal deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed blades are arranged radially outside the impeller with disc springs to press blade bodies against the housing, then clearance between blades and housing is suppressed, but device complexity increases
Solution Approach 1:
The invention divides the blade structure into modular components: blade bodies fixed to a movable member (vane plate), with disc springs positioned in spaces between movable members. This segmentation allows independent adjustment and maintenance of each blade-housing interface, suppressing clearance while managing complexity through modularity.
Solution Approach 2:
The invention transitions from a single-plane blade arrangement to a three-dimensional configuration where blade bodies extend axially from a movable member, and disc springs are positioned in the axial direction between movable members and housing. This dimensional change enables clearance suppression through axial pressing rather than radial constraints alone.
2Productivity
If vanes are arranged radially outside the impeller, then efficiency is maintained, but clearance develops due to thermal deformation
Solution Approach 1:
The invention positions disc springs in advance in the spaces between movable members and the housing, so that when thermal deformation occurs during operation, the springs are already in place to absorb the deformation and maintain contact between blade bodies and housing, preventing clearance development.
Solution Approach 2:
The invention uses disc springs to dynamically adjust the positional parameters of blade bodies relative to the housing. As temperature changes cause thermal deformation, the springs compress or extend to maintain optimal clearance parameters, ensuring efficiency is maintained despite parameter changes in the system.
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 suppresses clearance between vanes and housing, maintaining efficiency by increasing contact area through thermal compensation.
Implementation Method 1
an elastic body that is arranged between the second surface of the vane plate and the second wall surface and that presses the vane plate and the plurality of vanes toward the first wall surface
Implementation Method 2
an inclined surface that is formed on at least one of the first wall surface and the protruding ends of the plurality of vanes and that is inclined with respect to a radial direction of the impeller
Data Source
AI summary
A rotation device includes an impeller, a plurality of vanes that are arranged along a circumferential direction in an area radially outside the impeller and that protrude in an axial direction, a first wall surface that faces a protruding end of each of the plurality of vanes in the axial direction, and an inclined surface that is formed on at least one of the first wall surface and the protruding ends of the plurality of vanes and that is inclined with respect to a radial direction of the impeller.