Principal research areas on mechanical face-seals
Abstract A critical review of world literature on radial face-seals is presented in order to further understanding of seal operation and to obtain some elements of a design method for optimization of their performance. The principal areas examined are hydrostatic, hydrodynamic and boundary lubrication of the faces, and in particular cavitation and the influence of different constructive parameters on the dynamic behaviour of these seals.
A New Ultra-Precision Grinding Method for Manufacturing the Wavy-Tilt-Dam Mechanical Face Seals
This article reports a new ultra-precision grinding method for manufacturing wavy-tilt-dam mechanical face seals. It uses a horizontal rotary table, a horizontal swing table, and a vertical linear axis to perform micro-infeed grinding with a slightly inclined cup wheel using line contact kinematics at constant wheel depth of cut. The rotation motion of the rotary table, swing motion of the swing table, and reciprocating motion of the linear axis were numerically controlled so that the grinding contact arc between the cup wheel and the seal ring was a highly accurate approximation of the curves on the wavy-tilted surface bounded by its inner and outer peripheries and the trajectory of the contact arc formed the wavy-tilted surface. The sealing dam was generated when the rotary table rotated about the rotational axis and the swing table was locked in a position where the two end points of the grinding contact arc had the same height. This was expected to be an efficient method to manufacture wavy-tilt-dam mechanical seal faces with extremely high form accuracy and low surface roughness.
Simulating the Illuminance and Efficiency of the LEDs Used in General Household Lighting
Abstract The advantage of the LEDs illumination in general household lighting was proposed. High efficiency white LED as the light source was provided the energy saving illumination of the general household lightings. Different spaces in general household with different standards of average illuminance were designed and simulated by LightTools and DIALux software. The power consumptions and efficiency of traditional illuminated light sources and LED light source in lighting the household environment were analyzed and compared with each other at the same standard of average illuminance. Finally, it provided the advantage of using white LEDs in different spaces of the general household lighting.