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Radial lip seal design parameters and simulations : influencing leak-rate parameters

Iordache, C. (2017) Radial lip seal design parameters and simulations : influencing leak-rate parameters.

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Abstract:In this study the goal was to establish which design parameters have a significant effect upon the leak rate of the current static radial lip seals and to establish the magnitude of these effects, as well as to optimize the design parameters settings for a minimum leak rate. This was achieved by the means of an experimental setup coupled with a numerical simulation, leading to the conclusion that the parameters which have an important contribution towards the change of leak rate are: lip ring chamber (housing) diameter, insertion pipe diameter and pressure drop along the seal contact surface. The first important thing to mention is that the leak rate at zero hour for the current studied lip seals along with their geometrical variations of tolerances is not of any concern involving increased leakage rate and it is well within the standards with a 6000 times lower leak rate. The theory of leak rate seals presented as a subchapter in this study, relates indeed the parameters written above as being of high importance, because ultimately they can be translated as variation of contact pressures due to stress (force) exerted upon the seal within certain given tolerances. It has been concluded that two situations exist: one in which the seal is mounted in a pre-compressed state in the chamber and the other one when the seal is not mounted in a pre-compressed state. In the first situation is shown that the applied contact force which is transmitted thru the seal has less change than the change with the contact surface, meaning that the contact pressure increases with decreasing contact surface until a point where the seal is almost not subjected to any stress anymore and the contact surface as well as the contact pressure drops dramatically, case in which we would not like to find ourselves. In the second situation it has been remarked that the applied contact forces change more (exponentially) with respect to contact surface, and for a lip seal which is subjected to a pre-compression state, the contact pressure starts increasing with increasing contact surface, meaning that an increase in force will give an increase in contact pressure as well as an increase in contact surface.
Item Type:Internship Report (Master)
Clients:
Bosch Thermotechniek B.V., the Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Sustainable Energy Technology MSc (60443)
Link to this item:http://purl.utwente.nl/essays/71996
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