Stationary Blade Fixation in Rotating Machines
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Solution Overview
Problem
The existing methods for fixing a stationary blade in a rotating machine, such as turbochargers, face challenges in assemblability and heat management, particularly in small turbochargers or those with waste-gate valves, leading to potential detachment or inefficiency due to radial support structures and reliance on disc springs.
Innovation Solution
A stationary-blade-type rotating machine design featuring an annular circumferential groove in the impeller housing and a ring-shaped fitting member that expands radially to press and fix the stationary blade directly to the impeller housing, independent of the bearing housing connection, enhancing assemblability and reducing heat discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disc spring is used to press and fix the stationary blade to the turbine housing, then the stationary blade can be fixed within the housing, but the assembly process becomes complex and the stationary blade may detach or incline during fastening
Solution Approach 1:
The invention extracts the disc spring from the assembly process entirely. Instead of using a disc spring to press the stationary blade against the turbine housing, the stationary blade is directly pressed and fixed to the impeller housing by the impeller housing itself through the fitting member, eliminating the need for separate springs and complex assembly steps
Solution Approach 2:
The invention merges the fixation function into the impeller housing structure. The impeller housing directly presses the stationary blade through the fitting member, combining the housing structure with the fixation mechanism, thereby simplifying the overall assembly and eliminating separate fixation components
2Reliability
If a radial support structure is used to fix the stationary blade, then the stationary blade can be supported, but heat discharge from the stationary blade increases and turbine efficiency decreases
Solution Approach 1:
Instead of supporting the stationary blade from the rear (turbine housing side) as in conventional radial support structures, the invention inverts the support direction by pressing and fixing the stationary blade to the impeller housing from the front side, thereby eliminating the need for radial support structures that cause heat discharge
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
This design simplifies the assembly of the stationary blade, ensures stable fixation, and reduces heat discharge, thereby improving the efficiency and reliability of the rotating machine by eliminating the need for radial support structures and disc springs.
Implementation Method 1
a ring-shaped fitting member (10B) subjected to a force to expand in a radial direction while being fitted into the circumferential groove (10A)
Data Source
AI summary
A stationary-blade-type rotating machine is provided with a rotational shaft, an impeller, an impeller housing having a scroll passage formed on an outer peripheral side of the impeller, a bearing housing connected to the impeller housing in an axial direction of the rotational shaft, a stationary blade disposed in a radial passage formed between the scroll passage and the impeller and defined by an impeller-housing-side member and a bearing-housing-side member which face each other in the axial direction of the rotational shaft. The fixation unit includes an annular circumferential groove formed in an inner peripheral surface of the impeller housing and a ring-shaped fitting member subjected to a force for expanding in a radial direction while being fitted into the circumferential groove. The fitting member is configured to press the stationary blade to the impeller housing via at least one of the impeller-housing-side member or the bearing-housing-side member.