The working mechanism and characteristics of the helical seal are described and a successful application of the above helical seal are accomplished through reforming the furaldehyde pump.

• 对螺旋密封的工作机理及性能特点做了较为详细的论述，并通过对糠醛原料泵的改造试验，将螺旋密封成功地进行了实际的应用，大大降低了生产成本，有一定的实用价值。