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Sealing characteristics of mechanical seals-
by：Lepu Seal
2021-04-15
Sealing characteristics of mechanical seals
2017-07-27
Sealing characteristics of mechanical seals:
Figure 1-14 shows the test characteristics of a 75mm diameter balanced mechanical seal at a speed of 3600r/min. The correction coefficient can be used to obtain the leakage of other diameters and revolutions, that is, using the formula
and characteristic data available
It can be seen from the figure: when 8*****<0.5MPa, the leakage increases with the increase; when /0.5, the leakage decreases with the increase. This can be illustrated by the relationship between Q and and in the formula <1-28>.
Figure 1-15 shows the relationship curve between leakage correction coefficient and shaft diameter and speed. This curve can be used to obtain the leakage correction coefficient under different shaft diameters and rotational speeds. It has no direct relationship with viscous flow. Among them, it is purely the pumping effect caused by the mutual movement of surface asperities. This conclusion is based on the site From experience.
Figure 1-14 Characteristic curve of balanced mechanical seal
Figure 1-15 Correction coefficient of seal leakage
Examples 1-3 try to determine the leakage of Φ70mm mechanical seal at 3000r/min and 2MPa and the friction coefficient of the medium at 20℃. It is known that the load factor Ku003d0.683.
Solution: According to formula (1-13), the end-face specific load can be determined
Known 2.5MPa/h
According to formula (1-28), the leakage can be determined
It can be found in Figure 1-14.
In Figure 1-15, nu003d3000r/min, the correction coefficient of seal leakage at Φ70mmu003d0.6.
According to formula (1-29), we can get
Determine its confidence level: 95% seal
99% sealing
According to the formula <1-3>, the contact area of u200bu200bthe sealed end surface can be obtained
According to the working condition parameter formula
It can be judged that the seal is working under mixed friction. Checking Figure 1-12(c), the friction coefficient of water at 20°C is 0.036.
318 mechanical seal
544.html,
The friction characteristics of mechanical seals mechanical seal seal ring force deformation and thermal deformation
2017-07-27
Sealing characteristics of mechanical seals:
Figure 1-14 shows the test characteristics of a 75mm diameter balanced mechanical seal at a speed of 3600r/min. The correction coefficient can be used to obtain the leakage of other diameters and revolutions, that is, using the formula
and characteristic data available
It can be seen from the figure: when 8*****<0.5MPa, the leakage increases with the increase; when /0.5, the leakage decreases with the increase. This can be illustrated by the relationship between Q and and in the formula <1-28>.
Figure 1-15 shows the relationship curve between leakage correction coefficient and shaft diameter and speed. This curve can be used to obtain the leakage correction coefficient under different shaft diameters and rotational speeds. It has no direct relationship with viscous flow. Among them, it is purely the pumping effect caused by the mutual movement of surface asperities. This conclusion is based on the site From experience.
Figure 1-14 Characteristic curve of balanced mechanical seal
Figure 1-15 Correction coefficient of seal leakage
Examples 1-3 try to determine the leakage of Φ70mm mechanical seal at 3000r/min and 2MPa and the friction coefficient of the medium at 20℃. It is known that the load factor Ku003d0.683.
Solution: According to formula (1-13), the end-face specific load can be determined
Known 2.5MPa/h
According to formula (1-28), the leakage can be determined
It can be found in Figure 1-14.
In Figure 1-15, nu003d3000r/min, the correction coefficient of seal leakage at Φ70mmu003d0.6.
According to formula (1-29), we can get
Determine its confidence level: 95% seal
99% sealing
According to the formula <1-3>, the contact area of u200bu200bthe sealed end surface can be obtained
According to the working condition parameter formula
It can be judged that the seal is working under mixed friction. Checking Figure 1-12(c), the friction coefficient of water at 20°C is 0.036.
318 mechanical seal
544.html,
The friction characteristics of mechanical seals mechanical seal seal ring force deformation and thermal deformation
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