Analyzes the design characteristics of the spiral groove combined mechanical seal, and presents its operation and modification.
对螺旋槽组合式机封的设计特点进行分析，并对运行情况和改进进行介绍。
Combined with engineering example, the construction practice of tunneling is introduced for the tunnel whose entrance stand at harmful geologic conditions of shallow cover and groove with soft soil.
结合工程实例，介绍了进口端位于浅埋、沟槽软土等不良地质隧道的工程实践。
A new type of combined seal system with ferromagnetic flow and gas along cylindrical spiral groove is proposed in this paper.
介绍了一种新型组合密封系统———气体螺旋槽与铁磁流体组合密封型式。
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