Design calculation of end face seal pair (friction pair) of mechanical seal
2017-08-30
Design calculation of
mechanical seal end face seal pair (friction pair):
As far as the current design level is concerned, there are two design calculation methods for the face seal pair (friction pair):
One is a commonly used empirical design method. This method is based on the allowable value of the sealing surface [pe] or [pv]. It is only suitable for contact wet-running mechanical seals with mixed friction conditions. Mechanical seals are not applicable in both the state and the running state.
The other is a comprehensively considered system design method. This method can be used in a wide range, not only for contact and non-contact mechanical seals, but also for liquid end face seals, gas end face seals, and consideration of hydrostatic Mechanical seal with flood effect and dynamic pressure effect. This method involves multi-disciplinary content, and the design method and content are highly specialized, so it is not introduced here.
1) Empirical design method
The [pe or [pv] values u200bu200bused in the empirical design method are all values u200bu200bbased on experience or experimental data, where the expression of pe is
It can be seen from the above formula that it is usually used to calculate the contact specific pressure of the liquid end face seal under the mixed friction state with a micro convex body, so it is only suitable for parallel surface mixed friction, liquid phase and contact mechanical end face seals Calculation. Since the above formula only considers the average nominal contact pressure and does not consider the solid friction state, it is impossible to design and calculate mechanical seals with different friction states, phase states and operating states.
In order to ensure the tight coupling of the sealing surfaces and ensure good sealing performance, it is necessary to adopt a suitable sealing surface specific pressure. In different situations, the value is different, see Table 2-7.
Table 2-7 Empirical values u200bu200bof the specific pressure of the sealing surface under different conditions
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The main dimensions of the mechanical seal seal ring structure the main calculation steps of the mechanical seal empirical design method
