摘要
双螺杆真空泵作为一种容积式真空泵,其内容积比对极限真空度有着重要的影响,并且作为重要的性能参数,在决定其应用方面也起着重要的作用。针对现有螺杆转子内容积比小、极限真空度低的问题,为了提高螺杆转子的内置容积比,进而开发具有高极限真空度的双螺杆真空泵,本文提出了一种新型两段式变螺距螺杆转子,进气端为螺距较大的变螺距段,排气端为螺距较小等螺距段,在保证进气量的同时增大了螺杆转子的内容积比。分析了中心角、半径比和螺旋线对螺杆转子抽速、面积利用率等性能参数影响,为螺杆转子参数优化提供了一定依据。通过数值模拟得到了螺杆转子的压力场和速度场的分布规律,揭示了螺杆转子的内部流场特性。分析了螺杆转子在施加不同载荷条件下的应力应变情况,为其他螺杆式机械设备的设计制造提供一定的理论指导意义。
As a positive displacement vacuum pump,the built-in volume ratio of twin screw vacuum pump has an important influence on the ultimate vacuum degree,and as an important performance parameter,it also plays an important role in determining its application.In order to improve the built-in volume ratio of the screw rotor and develop a twin screw vacuum pump with high ultimate vacuum,a new type of two-segment variable pitch screw rotor was proposed,the variable-pitch segment is located near the suction side,while the fixed-pitch segment is located near the discharge side,which increases the built-in volume ratio of the screw rotor while ensuring the pumping speed.Effects of geometric parameters including the radius ratio,central angle and helix on the rotor structure,area utilization and pumping speed of the proposed variable-pitch screw rotor were analyzed,which provided a certain basis for the optimization of screw rotor parameters.Through numerical simulation,the distribution law of pressure field and velocity field of screw rotor was obtained,and the internal flow field characteristics of screw rotor were revealed.The stress-strain situation of the screw rotor under different load conditions was analyzed.It provides certain theoretical guidance significance for the design and manufacture of other screw-type mechanical equipment.
作者
董丕键
赵利壮
肖志程
薛宇
丘彦锋
DONG Pijian;ZHAO Lizhuang;XIAO Zhicheng;XUE Yu;QIU Yanfeng(Offshore Oil Engineering Design Institure Co.,Ltd.,(Offshore Engineering Technology Center),Tianjin 300452,China;CNOOC Offshore Engineering Solutions Co.Ltd.,Tianjin 300459,China)
出处
《山东化工》
2025年第14期169-174,共6页
Shandong Chemical Industry
关键词
双螺杆真空泵
两段式变螺距螺杆转子
内容积比
极限真空度
thermo-responsive
membrane
grafting yield
gating haracteristics
permeability
activated carbon
