汽车空调旋叶式压缩机排气阀片的振动特性

排气阀片是汽车空调旋叶式压缩机中的关键零件,是压缩机主要振动噪声源之一。通过对排气阀片结构运动分析,建立了阀片振动的数学模型,并求解了压缩机排气阀片的固有频率及强迫振动。利用UG NX Nastran模态计算,确定了排气阀片的固有频率和振型。测试结果证明,压缩机的外壳振动总加速度、噪声和排气脉动都低于美国通用汽车公司"GMW标准"的规定上限,证明排气阀片工作的工作状态是可靠的。但研究结果表明,阀片振动的极限位移同限位板高度比较接近,因此,提高限位板的高度或者限制阀片的振幅以进一步控制系统的排气脉动和噪声仍然具有一定的空间。分析结果对排气阀片乃至压缩机整体的振动分析与控制以及故障诊断具有参考价值。

Analyzing the vibration of vane compressor discharge valve for automotive air conditioner

The discharge valve is one of the key parts of the vane compressor for automotive air conditioner, as well as one of the main vibration noise sources. Through the analysis of the movement of Discharge Valve structure, a mathematical model of the vibration of the valve was constructed, and the natural frequency and the forced vibration were solved. Calculating by the UG NX Nastran, the natural frequency and the mode of vibration of the discharge valve were identified. The testing results has verified that the shell vibration acceleration, noise and exhaust pulsation are lower than the upper limits of the GMW standards of the General Moors Corp., USA, having proved the reliability of the working condition of the discharge valve. However, the results of the research indicates that the ultimate displacement of the vibration of the valve is relatively close to the height of restrictor plates. Therefore, there still remains some space for raising the height of the restrictor plates or limiting the vibration amplitude for further control of the exhaust pulsation and noise of the system. The result of this analysis has a reference value for the vibration analysis and fault diagnosis of the discharge valve even the overall vane compressor.