| The key role of vacuum heat treatment furnace equipment fan apparatus is that make vacuum furnace backfilled inert gas capable of forming a high-speed loop. This will not only facilitate the rapid cooling of the metal parts, but also make an inert gas into the heating chamber in circulation and the furnace temperature will be more uniform. While the problem of high vacuum dynamic seal at connecting shaft between fan apparatus and external motor, due to high pressure and velocity and other complex environment, the traditional seal forms such as mechanical seal has been difficult to solve. So the purpose of this study is to design magnetic fluid seal scheme suitable for vacuum heat treatment furnace.Aiming at this goal, this thesis completes the following research works:(1)Through the study of the theory of magnetic fluid seal, combined with magnetic fluid Bernoulli equations and boundary condition, derived the magnetic fluid sealing pressure-resistant formula of vacuum heat treatment furnace.(2)Design the suitable magnetic fluid seal scheme suitable for vacuum heat treatment furnace, complete material choosing of the concrete structure and calculation of each sealing component.(3)Complete the simulation and analysis of two-dimensional static magnetic field of the magnetic fluid sealing structure with ANSYS, distribution of magnetic field lines, the vector magnetic flux density, magnetic field strength in the gap, sealing pressure are obtained. That means the design is reasonable.(4)Complete the whole assembly of magnetic fluid sealing, solve some problems occurred in the design, processing, assembly stages, the static seal pressure-resistant experiment and field test experiment were done, and its failure mode effect and hazard analysis are obtained. |
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