Compressor Iris Diaphragm Mechanism for Surge-Stable Boosting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compressors for internal combustion engine charging devices face challenges in achieving a wide characteristic map with minimal moment of inertia and maximum efficiency, while maintaining stable operation during transient states and avoiding surging, especially at low-end apex torque and varying engine loads.
Innovation Solution
A radial compressor with an iris diaphragm mechanism featuring adjustable lamellae and a mechanical coupling system that allows for precise control of the air flow cross-section, enabling stepless variation of the compressor's operating range and preventing surging by acting as an overrun air recirculation valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor characteristic map is widened and peak efficiency is maximized, then the moment of inertia of the compressor increases, but this reduces the response speed and low-end apex torque performance
Solution Approach 1:
The patent applies an adjustable inlet guide vane mechanism that can dynamically change the inlet flow angle and compressor characteristic map during operation. This allows the system to optimize between different operating conditions: at low speeds, the inlet guide vanes adjust to maintain stable operation and reduce surging, while at high speeds, the characteristic map can be widened for maximum efficiency without permanently increasing the compressor's moment of inertia.
2Loss of energy
If the compressor is optimized for maximum efficiency at rated load, then the response behavior during transient states deteriorates, but faster response may reduce efficiency
Solution Approach 1:
The adjustable inlet guide vane mechanism performs preliminary adjustment of the inlet flow conditions before the compressor enters transient operating states. By pre-positioning the inlet guide vanes according to anticipated load changes, the system prepares the compressor for optimal transient response while maintaining efficiency during steady-state operation. This proactive adjustment prevents surging and improves response behavior without sacrificing rated load efficiency.
3Power
If the compressor operates at the surge limit to maximize power output, then stable operation deteriorates, but moving away from the surge limit reduces power output
Solution Approach 1:
The system incorporates control mechanisms that continuously monitor compressor operating conditions and adjust the inlet guide vanes accordingly. This feedback control ensures that the compressor operates close to, but not beyond, the surge limit under normal conditions, maximizing power output while maintaining stability. During transient states or unexpected conditions, the feedback system rapidly adjusts the inlet guide vanes to prevent surging, thereby maintaining stable operation without permanently reducing power output capability.
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 provides efficient and stable operation by allowing active control of the compressor's characteristic map, maintaining stability during sudden load changes and reducing wear and noise, while being cost-effective and adaptable to various installation constraints.
Implementation Method 1
Inner contact surfaces of the two fingers are cylindrical so as to correspond to the spherical outer contact surface of the bearing bush and are in sliding contact with the outer contact surface of the bearing bush
Data Source
AI summary
A compressor is disclosed for a charging device of an internal combustion engine. An iris diaphragm mechanism is arranged upstream of the compressor wheel. An actuator is mechanically coupled to an adjusting ring of the iris diaphragm mechanism for transmitting torque of an actuator shaft to the adjusting ring for rotating the adjusting ring. A pivotable coupling pin is arranged eccentrically on the actuator shaft and has a bearing bush which is displaceable along a longitudinal axis of the coupling pin. The bearing bush is mounted between two fingers of an adjusting lever of the adjusting ring so as to be displaceable along the fingers. An outer contact surface of the bearing bush is spherical. Inner contact surfaces of the two fingers are cylindrical to correspond to the spherical outer contact surface of the bearing bush and are in sliding contact with the outer contact surface of the bearing bush.