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Main structure of
the mechanical seals |
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Flexible member
Face (Primary Ring)
Metal Parts
Seat (Stationary Ring)
Springs
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The mechanical seasl shown in above
is a simple light-duty design. The sealing interface where the
seal rotating and stationary faces make rotational contact is
a plane annulus. The sealing faces themselves are lapped to
a very high degree of flatness, measured in wavelengths of light.
The body of the rotating component of the mechanical seal is
free to float axially. This enables hydraulic pressure to keep
the main sealing faces together in operation; in the absence
of hydraulic pressure the spring serves the same purpose
The closing force on the seal is designed
to provide an acceptable compromise between leakage and wear.
It must also be sufficient to prevent the faces from separating
in the event of mechanical shock or a pressure fluctuation.
A secondary seal prevents leakage between the floating assembly
and the shaft; often a rubber `O' ring is used for this purpose.
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| Weak Spring Load |
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| Result = Unacceptable Leakage |
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| Excessive Spring Load |
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| Result = Unacceptable Seal Life |
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2007 上海天示机械零部件制造有限公司 版权所有 Http://www.trisunltd.com |
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