Mixed-flow Turbine Wheel Sensor Detection Surface
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Solution Overview
Problem
The challenge in unbalance correction of mixed-flow turbine wheels is the difficulty in installing an optical sensor device to detect rotation without interfering with other components, due to the oblique leading edge of the rotor blades and the presence of the bearing housing and unbalance detection device, which complicates the formation of a sensor detection surface that can be accurately accessed.
Innovation Solution
A mixed-flow turbine wheel design featuring a hub with rotor blades having an oblique edge portion and a sensor detection surface with a flat shape applied on the circumferential surface or edge portion, allowing the optical sensor device to be installed remotely from the center of the rotational shaft, thus avoiding interference with other components and enabling accurate rotation detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical sensor device is installed in the vicinity of the compressor wheel or turbine wheel on the axis of the rotational shaft to detect rotation, then rotation detection is enabled, but the angle sensor interferes with the tool when grinding the boss portion of the rotor for unbalance correction
Solution Approach 1:
The patent transitions the sensor detection surface from a radial position (on the axis of the rotational shaft) to an axial position (on the tip portion of the boss portion or back plate portion). This dimensional change allows the optical sensor device to detect rotation from the axial direction, eliminating interference with the tool during unbalance correction work while maintaining accurate rotation detection capability
2Measurement precision
If the sensor detection surface is formed on the leading edge of the rotor blade parallel to the axis of the rotational shaft, then rotation detection is possible, but the optical sensor device cannot be installed due to interference with the bearing housing and unbalance detection device in mixed-flow turbines
Solution Approach 1:
The patent creates a localized flat sensor detection surface on the tip portion of the boss portion or back plate portion, which is a specific local area designed for sensor mounting. This local flat surface provides a dedicated detection zone that does not interfere with other components, solving the installation complexity issue while maintaining rotation detection precision
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 allows for effective unbalance detection and correction by enabling the optical sensor device to face the sensor detection surface without physical interference, ensuring accurate acquisition of rotation speed and phase information for unbalance correction.
Implementation Method 1
the optical sensor device detects the rotation speed (phase) by detecting reflection of light emitted by the optical sensor device and reflected by the sensor detection surface
Data Source
AI summary
A mixed-flow turbine wheel includes: a plurality of rotor blades disposed on a circumferential surface of the hub at intervals in a circumferential direction and configured such that each of the plurality of rotor blades has a leading edge which includes, in a meridional view, an oblique edge portion where a distance between the leading edge and an axis of the rotational shaft decreases from a tip side toward a hub side, and a sensor detection surface having a flat shape and being applied with a marking which is detectable by an optical sensor device. The sensor detection surface is formed on at least one of the circumferential surface of the hub or an edge portion of a reference rotor blade being one of the plurality of rotor blades, such that, in the meridional view, a trailing-edge side angle of two angles formed between the axis of the rotational shaft and a normal of the sensor detection surface is smaller than a trailing-edge side angle of two angles formed between the axis of the rotational shaft and a normal of the oblique edge portion.