CN101832246B - 八列对称平衡式大型往复压缩机 - Google Patents

八列对称平衡式大型往复压缩机 Download PDF

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CN101832246B
CN101832246B CN2010101524311A CN201010152431A CN101832246B CN 101832246 B CN101832246 B CN 101832246B CN 2010101524311 A CN2010101524311 A CN 2010101524311A CN 201010152431 A CN201010152431 A CN 201010152431A CN 101832246 B CN101832246 B CN 101832246B
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吴四建
余小玲
王勇
冯全科
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Baoji City Bolei Chemical Equipment Co ltd
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Abstract

本发明公开了一种八列对称平衡式大型往复压缩机，包括驱动电机、曲轴及八列气缸，其特征在于，四列气缸与一个曲轴相连并置于驱动电机的一侧；另四列气缸与另一个曲轴相连并置于驱动电机的另一侧，两个曲轴结构相同。I、II列气缸对应的曲拐在一个平面内，且与第III、第IV列气缸对应的曲拐平面垂直；第V、第VI列气缸所对应的曲拐在同一平面内，并与第I、第II列气缸对应的曲拐平面呈45°角；第VII、第VIII列气缸所对应的曲拐平面与第V、第VI列气缸所对应的曲拐平面垂直；同一平面内的曲拐所对应的气缸构成一个对动列，其设有连接连杆与活塞杆的十字头，其中一连杆对十字头作用的侧向力始终朝下，而另一连杆对十字头作用的侧向力始终朝上。

Description

八列对称平衡式大型往复压缩机
技术领域
本发明涉及一种流体机械，特别涉及一种用于石油化工和动力工程的多列对称平衡式大型往复压缩机。
背景技术
现代石化和化工工业朝着大型化、模块化发展，需要大型多列往复式压缩机供给压缩的原料气体；现代的机械制造技术，也能使大型多列往复压缩机的制造变成现实。上个世纪90年代由上海压缩机厂与美国德莱赛兰公司联合研制的八列大型往复式压缩机是国内第一台八列压缩机，它用于南京化学工业公司化肥厂，其结构是八列气缸对称平衡布置，共用一根长达10米的曲轴，驱动电机置于曲轴的端部，这种电机与气缸的布置方式使得整体曲轴和机身的加工难度很大，特别是整体曲轴的热处理和锻造过程的质量难以控制。且曲轴在扭矩输入端，扭转应力很大，整个曲轴容易发生扭转共振，引起轴的断裂(许增金，王世杰等，ANSYS在多列往复压缩机轴系扭振分析中的应用，[J]《压缩机技术》2009，No2，1～6)。对于八列气缸的结构，国内外只有驱动电机设置在轴的一端，来驱动一根整体曲轴上的八列活塞，至今还没有八列气缸对称地分置在驱动电机两侧的先例。文献《容积式压缩机技术手册》列出了一种六列往复压缩机结构，其中四列气缸置于驱动电机的一端，另外两列置于驱动电机的另外一端，不属于对称的分置结构。此外，大型往复式压缩机的曲轴太长，锻件毛坯重达8吨以上，材料成本十分昂贵，且大尺寸工件加工质量难于保证，维修不方便。
发明内容
本发明的目的是提供一种曲轴加工质量容易保证、受力均衡的八列以上对称平衡式大型往复压缩机。
为达到以上目的，本发明是采取如下技术方案予以实现的：八列对称平衡式大型往复压缩机，包括驱动电机、曲轴及八列气缸，其特征在于，第I、第II、第III、第IV列气缸与一个曲轴相连并置于驱动电机的一侧；第V、第VI、第VII、第VIII列气缸与另一个曲轴相连并置于驱动电机的另一侧，两个曲轴结构相同；第I、第II列气缸对应的曲拐在一个平面内，且该曲拐平面与第III、第IV列气缸对应的曲拐平面垂直；第V、第VI列气缸所对应的曲拐在同一平面内，该曲拐平面与第I、第II列气缸对应的曲拐平面呈45°角；第VII、第VIII列气缸所对应的曲拐平面与第V、第VI列气缸所对应的曲拐平面垂直；同一平面内的曲拐所对应的气缸构成一个对动列；在该对动列中，设有连接连杆与活塞杆的十字头，其中一列连杆对十字头作用的侧向力始终朝下，而另一列连杆对十字头作用的侧向力始终朝上。
上述方案中，所述的每列气缸，其填料采用外置式结构固定在气缸底端。所述填料由多组密封圈组成，每一组密封圈装在一盒独立的填料盒内，将多个该填料盒用定位螺栓串成一体，并拉紧固定，整体固定在气缸底端。每个填料盒上设置有冷却水通道，对填料盒内的密封圈实施冷却。
所述侧向作用力始终朝上的十字头包括十字头体，其与下滑履之间设置有弹簧片，该弹簧片产生向上作用力大于十字头体的重力，使与十字头体固联的上滑履始终紧贴上滑道往复运动，十字头体与下滑履之间设有定位销。
本发明公开的八列气缸分置于驱动电机两侧的结构，其优点是：1、曲轴受力均衡，其强度利用充分。一方面曲轴采用两段分别与驱动电机连接，各整体段相对尺寸较小，在锻造和热处理过程中容易保证材料内部质量；另一方面，飞轮置于驱动电机处，飞轮距离各列曲拐相对较近，不易使曲轴发生低频的扭振。
2、本发明对填料采用了创新的外置结构，一方面使气缸长度缩短，从而减少了气缸的材料成本，提高了加工质量及检修的方便性；另一方面便于填料的冷却和维修。
3、大型往复式压缩机的活塞杆摆动对高压级填料的使用寿命危害极大，为此，本发明对承受向上侧向力的十字头滑板采用弹性连接机构，保证十字头在整个往复循环中始终与上滑道接触，消除十字头在运动过程中的敲击及活塞杆的摆动。
附图说明
图1为本发明八列压缩机的结构示意图。
图2为图1气缸结构示意图，其填料组件设置在气缸之外。
图3为传统的压缩机气缸结构，其填料组件设置在气缸座之内。
图4为图1左侧两对动列结构示意图，其一列的十字头受力始终朝上，另一列十字头受力始终朝下。
图5为图4中的十字头结构。
图1至图5中：1-气缸；2-驱动电机一侧的曲轴；3-驱动电机；4-驱动电机另一侧的曲轴；5-填料；6-十字头体；7-下滑履；8-弹簧；9-定位销；10-上滑履；12-定位螺栓；13-十字头；14-连杆；15-活塞杆；16-活塞。
具体实施方式
如图1所示，本发明一种八列气缸的往复式压缩机，该压缩机的四列气缸I、II、III、IV及其对应的曲轴2置于驱动电机3的一侧；另四列气缸V、VI、VII、VIII及其对应的曲轴4置于驱动电机3的另一侧。在驱动电机3的一侧，I、II列气缸对应的曲拐在一个平面内，且该平面与III、IV列气缸对应的曲拐平面垂直。在驱动电机3的另一侧，V、VI列气缸所对应的曲拐在同一平面内，该平面与I、II列气缸对应的曲拐平面呈45°角。VII、VIII列气缸所对应的曲拐平面与V、VI列气缸所对应的曲拐平面垂直。曲轴2与曲轴4的结构完全相同，只是在旋转方向两侧曲轴相互错角+45°或-45°。曲轴2和曲轴4均通过法兰与驱动电机3相连。
I列和II列的曲拐在同一个平面内，构成一个对动列；III列和IV列的曲拐处在与I列和II列曲拐平面相垂直的另一个平面内，构成另一个对动列。V列和VI列，VII列和VIII列也构成了两对对动列，两对动列所在的曲拐平面相互垂直。即八列曲拐在一个圆周上依次等角度分布。
如图2所示，对每列气缸来说，高压级填料5采用外置式结构，而传统的高压级填料5布置如图3所示。高压填料5一般由多组填料密封圈组成，每一组填料密封圈装在一盒独立的填料盒内，将多组填料盒用定位螺栓12串成一体，并拉紧固定，然后整体固定在气缸1底端。填料盒上设置有冷却水通道，对填料盒内的填料密封圈实施冷却。本发明这种高压级填料5外置式结构一方面减少了气缸1的长度，节省了气缸1的材料成本，提高了气缸1的加工质量；另一方面使得填料5安装维修方便，同时填料5的冷却效果增强。
如图4所示，在对动式往复压缩机的两对动列中，十字头13分别与连接曲轴的连杆14和连接气缸活塞的活塞杆15相连，连杆14将曲轴2的旋转运动转化为十字头13的往复运动。一列的连杆14对十字头13作用的侧向力N始终朝下，而另一列的连杆14对十字头13作用的侧向力始终朝上。根据压缩机的动力学特性，侧向力的大小在活塞往复运动中始终变化。在活塞16行程中间位置，侧向力数值较大，而在活塞行程的上下止点附近，侧向力接近于零值。于是，对于侧向力始终朝上的一列十字头13(图2曲轴左侧)，考虑到侧向力和十字头重力的合力作用，十字头13在往复运动中会在滑道中上下敲击，并带动活塞杆15的上下跳动，这对填料密封圈造成严重损害。
本发明针对侧向力始终朝上的一列(图2曲轴左侧)，提出一种弹性十字头结构，如图5所示。在十字头体6与下滑履7之间设置一种弹簧片8。让弹簧片8产生的向上作用力大于十字头重力，使十字头的上侧滑履10始终紧贴上滑道往复运动，保证十字头13及与其连接的活塞杆15不发生上下跳动，从而，保证了活塞杆15不对填料密封圈产生径向作用力。十字头体6与下滑履7之间有定位销9。十字头体6与上滑履10之间焊接固定。
按照通用的《机械设计手册》规定公差配合范围，十字头13的滑履与机身上的滑道之间的双侧总间隙在0.1～1.0mm之内。在图5所示的十字头中，十字头体6下部设置两个定位销9，在下滑履7上有相对应的销孔，通过双方凸台的配合或销9与销孔的滑动配合，实现十字头体6与下滑履7之间在水平方向不产生超过0.1mm的相对位移。
十字头体6与下滑履7之间的加入的弹簧片8的总变形在10mm之内，但不小于2mm。当十字头上下滑履10、7直径被缩紧到滑道尺寸时，弹簧片8上的弹力FF＝(1.2～1.5)W式中，W——十字头的重力与连杆重力三分之一的合力。
由于在十字头体6与下滑履7之间加入了弹簧片8，使得十字头装入滑道时发生困难。这时，需要采用导套将十字头体6与下滑履7拉近，进而导入机身上的滑道内。或者在下滑履7和十字头体6上设置螺栓和螺纹孔，在十字头装入滑道时，用螺栓把下滑履7与十字头体6固紧，使十字头直径尺寸小于滑道孔径，待十字头装入滑道后，再将螺栓松开或拆除。
按本发明制造的压缩机已经在陕西韩城黑猫煤化工公司投入运行，工作十分平稳。

Claims (5)

1.一种八列对称平衡式大型往复压缩机，包括驱动电机、曲轴及八列气缸，其特征在于，第I、第II、第III、第IV列气缸与一个曲轴相连并置于驱动电机的一侧；第V、第VI、第VII、第VIII列气缸与另一个曲轴相连并置于驱动电机的另一侧，两个曲轴结构相同；第I、第II列气缸对应的曲拐在一个平面内，且该曲拐平面与第III、第IV列气缸对应的曲拐平面垂直；第V、第VI列气缸所对应的曲拐在同一平面内，该曲拐平面与第I、第II列气缸对应的曲拐平面呈45°角；第VII、第VIII列气缸所对应的曲拐平面与第V、第VI列气缸所对应的曲拐平面垂直；同一平面内的曲拐所对应的气缸构成一个对动列；在该对动列中，设有连接连杆与活塞杆的十字头，其中一列连杆对十字头作用的侧向力始终朝下，而另一列连杆对十字头作用的侧向力始终朝上。
2.如权利要求1所述的八列对称平衡式大型往复压缩机，其特征在于，所述的每列气缸，其填料采用外置式结构固定在气缸底端。
3.如权利要求2所述的八列对称平衡式大型往复压缩机，其特征在于，所述填料由多组密封圈组成，每一组密封圈装在一盒独立的填料盒内，将多个该填料盒用定位螺栓串成一体，并拉紧固定，整体固定在气缸底端。
4.如权利要求3所述的八列对称平衡式大型往复压缩机，其特征在于，所述每个填料盒上设置有冷却水通道，对填料盒内的密封圈实施冷却。
5.如权利要求1所述的八列对称平衡式大型往复压缩机，其特征在于，所述侧向作用力始终朝上的十字头包括十字头体，该十字头体与下滑履之间设置有弹簧片，该弹簧片产生向上作用力大于十字头体的重力，使与十字头体固联的上滑履始终紧贴上滑道往复运动，十字头体与下滑履之间设有定位销。
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