基于石英音叉谐振测头的喷油嘴微锥孔测量

Micro Tapered Hole Measurement of Injector Nozzle Based on Resonant Trigger Probe Using Quartz Tuning Fork

柴油发动机喷油嘴喷油孔具有孔径小和深宽比高等特征,其几何参数对于保证燃油雾化质量、发动机燃烧效率以及降低污染物排放极其重要。基于石英音叉光纤一体式三维谐振测头,提出了喷油嘴微锥孔测量方法。通过测头在谐振状态下受到微力后谐振参数的改变来实现高精度触发定位,从而对具有设计指标的喷油嘴微锥孔进行测量,得出微锥孔的锥角参数。试验结果验证了该测头在微小元器件精密测量方面的有效性。

The micro hole of the diesel engine′s fuel injector nozzle has the characteristics of small aperture and high aspect ratio.Its geometric parameters are extremely important to ensure the fuel atomization quality,engine combustion efficiency and reduce pollutant emissions.Based on the 3D resonant probe composed of a tuning fork and an optical fiber,a method for measuring the micro tapered hole of the fuel injector is presented.The probe can achieve high-precision 3D trigger positioning of micro-devices by the change of the resonance parameters after the probe is subjected to micro-force under the resonance state,so that the tapered hole of injector nozzle is measured and the taper angle of the hole is obtained.The experiment results verify the effectiveness of the probe in the measurement of micro components.