The fluid through a maze resistance and the flow of the decrease of the function is called "maze effect". For liquid and gas, fluid mechanics effect, including hydraulic friction effect, flow bunch of shrinkage effect; In addition to the gas, and thermodynamics effect that gas in the maze for compression or expansion and the heat generated by the transformation; In addition, there are "breathe freely effect", etc. And the effect is a maze effect the comprehensive function. The tooth type ventilator bearing the labyrinth seal, shaft neck for optical axis, belong to direct type maze, NTN bearing lubrication and NTN bearing sealing seal liquid belong to non-compressible fluid, basically have the friction effect, flow bunch of shrinkage effect and ventilation effect, sealed effect but also to the form of the structure. The influence factors of points as follows.

The friction effect and influence factors: leakage flows in the maze flow, for liquid viscosity and of generation friction to slow down the flow velocity (leakage) decrease. Say simply, fluid along the path of flow friction and local friction constitute the friction effect, the former and channel length and cross-section shape relevant; The latter and maze of bending number and geometric shape relevant. Generally when flow raod, turn nasty, tooth top, resistance is big, differential pressure losses significantly, and leakage reduced;

Flow bunch of shrinkage effect: since the flow through the maze seam, because of the influence of the inertial causing shrinkage, flow of beam section decrease. Its effect and the maze seam the flow coefficient of the relevant. The flow coefficient of the maze seam and the shape of the clearance, tooth shape of the top of the wall and roughness. The fluid of compressibility, also with Reynolds number involved;

Ventilation effect: general through the maze, because through the seam of air after only to spread on one side, the INA full pack needle bearing installed in the expansion of indoor cannot be adequately for the speed can (kinetic energy) to heat energy conversion, and by the side wall of smooth gas speed reduced or not only a slight decrease, directly across all top gear to low voltage side, this a passing phenomenon known as "breathe freely effect".

 
Labyrinth seal structure types: direct type maze exist breathable phenomenon, the leakage of the maze than ideal leakage.



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