基于 FBG 改进泄压阀的旋叶式压缩机 排气压力感知研究

针对旋叶式压缩机排气压力精准监测难问题,提出了基于光纤布拉格光栅(fiber Bragg grating, FBG)改进泄压阀的旋叶 式压缩机排气压力感知方法。 首先,依据旋叶式压缩机泄压阀结构特点,结合 FBG 传感理论,建立了膜片式压力传感器模型, 揭示了压力与中心波长的映射关系;其次,设计了基于泄压阀的三段式 FBG 压力温度复合传感器,理论分析表明该传感器灵敏 度为 304. 26 pm/ MPa;最后通过仿真实验分析,研究了膜片半径、厚度对传感器灵敏度的影响,得到了最优半径与厚度组合(R = 5 mm, h = 0. 6 mm),实验灵敏度为 330. 78 pm/ MPa,研究对旋叶式压缩机状态监测及功耗控制具有重要的理论和实际工程 价值。

Research on exhaust pressure sensing of rotary vane compressor based on FBG improved pressure relief valve

Aiming at the difficulty of accurate monitoring of the discharge pressure of rotary vane compressor, a method of sensing the discharge pressure of rotary vane compressor based on fiber Bragg grating (FBG) improved relief valve was proposed. Firstly, according to the structural characteristics of the pressure relief valve of the rotary vane compressor and the FBG sensing theory, the model of the diaphragm pressure sensor was established, and the mapping relationship between the pressure and the central wavelength was revealed. Secondly, a three-stage FBG pressure temperature composite sensor based on pressure relief valve was designed. Theoretical analysis shows that the sensitivity of the sensor is 304. 26 pm/ MPa. Finally, through simulation experiment analysis, the influence of diaphragm radius and thickness on sensor sensitivity was studied, and the optimal combination of radius and thickness (R = 5 mm, h = 0. 6 mm) was obtained. The experimental sensitivity is 330. 78 pm/ MPa. The research has important theoretical and practical engineering value for rotary vane compressor condition monitoring and power consumption control.