Dry Gas Seal

The main dimensions of the mechanical seal seal ring structure-

by：Lepu Seal 2021-05-11

The main dimensions of the mechanical seal seal ring structure
　2017-08-29　　
The main dimensions of the mechanical seal seal ring structure:
Figure 2-11 shows the main dimensions of the moving and static rings, including the seal end face width b, end face inner diameter D1 and outer diameter D2, as well as end face boss height e and dynamic and static ring and shaft The end face of the sealing ring is usually paired with two different materials, soft and hard. The narrow ring is usually made of soft material, and the wide ring is usually made of hard material, which can prevent the hard ring from being embedded in the soft ring after abrasion. If the strength and rigidity allow, the end face width b (its value) should be selected as small as possible. If it is too large, the cooling and lubrication effect will not be good. But it should not be too small, otherwise it will increase the end pressure, temperature and wear. In addition, the sealing working conditions should also be considered when selecting. In the case of high rotation frequency, volatile media and gas environment, the width of the end face should be appropriately reduced to facilitate lubrication and improve heat conduction conditions. The reference value of the width b of the end face of the narrow ring is shown in Table 2-5.
Table 2-5 Reference Value of Narrow Ring End Face Width b

When designing the end face width, the end face width of the hard ring should be 1~3mm larger than that of the soft ring. For example, when the moving ring and the static ring are made of hard materials, the two can be the same width. The height e of the end boss is generally 2~3mm. For graphite, filled PTFE, bronze, etc., tungsten carbide can be 2mm. When designing the boss, the main consideration is its strength and wear resistance.
After determining the load factor K, the end face width b and the balance diameter, the inner diameter center of the end face can be calculated:
Internal flow balance type seal

Outflow balanced seal

Unbalanced seal

In the case of balanced seal and unbalanced seal, the outer diameter of the end face

For the clearance between the sealing ring and the shaft (or sleeve), the moving ring and the static ring have different values. For the moving ring, although there is no relative movement with the sleeve, in order to ensure a certain degree of floatability to compensate for the deflection of the shaft (or sleeve) and the stationary ring and the influence of shaft (or sleeve) vibration, the diameter clearance ~e1 is 0.5 ~1mm. For the static ring, because it has relative motion with the shaft (or sleeve), the clearance value should be slightly larger, generally the value is about 2e1. The flatness of the friction pair on the end face of the seal ring should generally be less than or equal to 0.9. In order to prevent adhesion of the friction surface and reduce the starting torque, the two sealing end faces must have different roughness values u200bu200b(see Table 2-6).
Table 2-6 The value of the end surface roughness (Rs) of the friction pair

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Design calculation of the seal ring structure of mechanical seal 　　 mechanical seal end face seal pair (friction pair)

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