四杆机构的演化与动密封结构的创新设计

Evolution of four bar mechanisms and creative design of dynamic seal devices

根据密封功能的本质，运用“生物型”机械设计系统的演化思想，论证了四杆机构可演化成一些容积式泵类机构或机械，以及进一步作“零流量演化”而实现密封功能，并介绍了几种据此进行创新设计的新型结构动密封装置。指出无论是将螺旋液环泵用于密封，还是将滑动螺旋叶片泵用于密封，均应注意螺旋的旋向和轴的旋转方向应满足一定的关系。还指出把演化历程的规律提炼出来必然对机构或机械的创新设计具有指导意义，对动密封结构的创新设计也具有同样的作用。

According to the essence of seal function, based on evolution idea of 'biological pattern' machine design system, the author proves that the positive-displacement pumps can be evolved from the four bar mechanisms and even more, if the 'zero flow evolution' is made, the seal function can be realized. Thereby the author introduces some new dynamic seal devices designed based on the-aboved mentioned principle.