Concepts of the screw-type labyrinth seal are introduced and its present research and application are summed up.

Characteristic Investigation on the Flow Field of the Labyrinth Seals in a Steam Cylinder;

Numerical simulation of flow field and leakage rate in labyrinth seal;

Influence of labyrinth seal teeth shape on sealed flow field and leakage;

However, with development of turbo-machinery towards high capability and huge cubage,gas exciting vibration in labyrinth seals became the main reason threaten the security operating of the machinery set.

Labyrinth seals has been widely used in turbine machine, so the study on the theory of self-excited and dynamic characteristics has great important theoretical and practical meaning to the designing of a turbine machine with a sound dynamic function.

There exist air leakage phenomena in the original tooth roll labyrinth seal of pellet shaft furnace The new type of disk seal is used to substitute the labyrinth seal and the lubricating system are reformed and the strict operation and maintenance system are established Therefore, the air leakage problem of tooth roll can be dealt wit

After an enumeration of the existing problems specific to a labyrinth seal the necessity of employing contact and running in type seals was expounded along with an exploratory study of the lateral seal for a light type chain grate stoker.