The improvement design is made of pressurized sealing of the solid medium in view of problems concerned.A gas protective pressurization is taken out to prevent pressurized surface from being worn out.

• 根据含固体颗粒介质密封存在的问题进行设计改进,采取气体保护密封方案防止密封面磨损,并在理论上加以分析、计算,设计出较佳密封结构。