机械设计专业毕业设计---双吸平衡式双螺杆压缩机系统设计.doc

双吸平衡式双螺杆压缩机系统设计 专业： 机械设计制造及其自动化 学号：20070310010341 学生姓名：孙城江 指导老师：王小明 摘要 螺杆压缩机按被压缩气体种类和用途的不同，分为空气压缩机、制冷压缩机、工艺压缩机。其中，螺杆工艺压缩机是石油、石化企业可燃气回收装置的关键设备，目前，国内外可燃气回收装置一般采用单吸非平衡式双螺杆压缩机。由于这种压缩机的螺杆单向受力，当出口压力较高时，轴向定位的轴承受力很大，严重影响轴承的使用寿命，甚至有断轴的危险，另外出口处的机封受出口压力的影响，使用寿命也大大缩短，这样严重影响压缩机长周期运行。本文在对国内螺杆压缩机发展现状和发展情景做了充分调查的基础上，针对单吸非平衡式双螺杆压缩机的不足，提出了“双吸平衡式双螺杆压缩机”的构想。 双吸平衡式双螺杆压缩机的泵体内腔中部设有垂直螺杆轴向的隔板，隔板将泵体内工作腔隔为两个，隔板两侧螺杆段的螺旋齿大小形状相同，旋向反向，对应两个工作腔，在泵体壁上各设有对应的进气口，在泵体壁上轴向中部设有供两个工作腔出气的出气口。双吸平衡式双螺杆压缩机这种独特的原理结构使得螺杆两端的轴向力相互抵消，轴承受力较小，大大提高了轴承的使用寿命。与同排量的同类压缩机相比，其结构尺寸有极为突出的优势，原材料消耗及制造成本减少，无故障运行时间延长。 本文主要是设计双吸平衡式双螺杆压缩机的整体系统，主要包括油路系统、气路系统、电气控制系统。在系统设计之前，根据已知的设计参数对压缩机的热力学参数进行了计算，为系统设计和零部件选用提供技术参数。在系统设计中，着重于对电气控制系统的设计。文章最后阐述了压缩机的噪声控制方法和监测原理。 关键词:螺杆；压缩机；系统设计；天然气; System design on double suction balanced twin-screw compressor Abstract According to gases types and purposes, Screw compressors can be divided into air compressors, refrigeration compressors and process compressors. The process compressor is the key equipment of gas recovery device in petroleum or petrochemical enterprise， At present, the domestic and foreign general use gas recovery devices equipped with single suck non-equilibrium type double screw compressors. Because screws of the compressor bear one-way stress, the axial orientation bearing load is very big when the outlet pressure is higher, which seriously affect the service life of the bearings, even has broken danger. Meanwhile ，due to the machine by exit sealed outlet pressure effects, service life also greatly reduces, so seriously affect compression captain cycle operation . Teacher Wang and his research group proposed double suction balanced double screw compressor scientific conception to solve those problems. It is equipped with boards which are perpendicular to screw axis in the central of pump cavity. Boards divide the pump body cavity into two cavities. Both sides of the screw section have the same spiral tooth sizes and reverse spin. There are two corresponding inlet