The main dimensions of the mechanical seal seal ring structure-
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
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
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
Double end face metal bellows mechanical seal 564.html,
Design calculation of the seal ring structure of mechanical seal mechanical seal end face seal pair (friction pair)