It is clear that screw-sleeve type screw seal not only can obtain sealability as screw-shaft type screw seal, but also can improve sealing effect.

分析表明，螺套式螺旋密封不仅能获得与螺杆式螺旋密封相同的封液能力，而且还可以改善密封效果。

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The packing seal device of the screw shaft can automatically press the sealing packing, reliably eliminate wearing clearances of the packing in time and has the advantage of stable sealability.

该艉轴填料密封装置能自动压紧密封填料，及时可靠地消除填料磨损间隙，具有稳定密封装置密封性能的优点。

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