The contact specific pressure of the seal end face of the mechanical seal-
The contact specific pressure of the end face of the mechanical seal:
Contact specific pressure of the seal end face: When the contact mechanical seal is working normally, the seal end face is mostly in a state of mixed friction. There is both a fluid film and a molecular film and a micro convex contact. When considering the film pressure and film After the pressure coefficient, the contact specific pressure P of the sealing end face should also be considered. Under stable working conditions, the contact specific pressure of the sealing end face
For internal flow mechanical seal Pe is
For the outflow mechanical seal Pe is
For double-end mechanical seals (see Figure 1-9 for the structure of the end-face specific pressure, the pressure on the sealing surface on the atmosphere side and on the medium side is different.
Sealing liquid inlet Sealing liquid outlet
Figure 1-9 Structure diagram of double-end mechanical seal
The end pressure on the atmospheric side is
In the formula, the pressure of the Pf sealing liquid is in MPa.
The axial force balance analysis of the compensation ring on the medium side is shown in Figure 1-10, and the end pressure can be derived
Figure 1-10 Axial force balance analysis diagram of compensation ring on the medium side
In engineering, the determination of the contact specific pressure Pe of the seal end face depends on the load coefficient of the seal, the film pressure coefficient, the pressure of the sealed fluid and the specific pressure of the spring, etc. The load factor and film pressure factor vary with the nature of the medium, working conditions and use environment. Therefore, it must be determined according to specific conditions, as far as possible to make the minimum value to ensure that the contact pressure of the end face of the seal is small and stable. For contact-type liquid end face mechanical seals, in order to ensure that the seal end faces are tightly fitted, to avoid opening failure, to ensure long-life work, and to avoid early wear, thermal cracking, etc., the working specific pressure must be within the range.
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