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螺旋密封是一种非接触密封,由于螺旋的方向与主轴的旋转方向相反又称之为反螺旋密封,此种密封均已在空间装置及一般技术领域中广为应用。通过1981年以来的实践证明,将机泵的填料密封改用螺旋密封是有必要的、可行的。改造后可以延长泵的寿命,方便检修,节约能源,降低消耗。 1.螺旋密封结构及原理 螺旋密封结构见图所示,轴(套)与固定套之间有狭长间隙,轴上有螺旋槽间隙,其间充满液体。主轴转动时其螺旋槽内液体产生压头与被密封介质压力相平衡,从而阻止了液体的泄漏。密封的机理是由以下三种流动状态相平衡:一是高压端的液体沿着轴上的螺旋槽向外端泄漏;二是高压端的液体沿转动套与固定套间的环形间隙向外泄漏;三是外端(低压端)的液体由于螺旋槽的转动带动向
The screw seal is a non-contact seal. Since the direction of the screw is opposite to the rotation direction of the spindle, also called anti-helical seal, such seals have been widely used in space devices and general technical fields. Through the practice since 1981, it has been proved that it is necessary and feasible to change the packing seal of the pump to the screw seal. After the transformation can extend the pump life, easy maintenance, energy conservation and reduce consumption. 1. Spiral seal structure and principle Screw seal structure shown in the figure, the shaft (sleeve) and the fixed sleeve has a long gap between the shaft spiral groove clearance, filled with liquid between. When the spindle rotates, the pressure generated by the liquid in the spiral groove is balanced with the pressure of the sealed medium, so as to prevent liquid leakage. Sealing mechanism is the balance of the following three kinds of flow conditions: First, high-pressure liquid along the axis of the helical groove leak to the outside; Second, the high-pressure liquid along the rotating sleeve and the fixed sleeve annular gap leakage to the outside; Third The outer end (low pressure side) of the liquid due to the rotation of the spiral groove driven