The key factors affecting the air film mechanical seal are the medium pressure and sliding speed-

The key factors affecting the air film mechanical seal are the medium pressure and sliding speed

　2018-11-29　　

The key factors affecting the air film mechanical seal are the medium pressure and sliding speed:

The opening force of the end face of the air film mechanical seal depends on the speed. It is easy to understand that there is no gas dynamic pressure and closing force (ie, medium pressure and spring force) acting on the end face of the mechanical seal to make contact during the parking phase. The same applies at low speeds. In other words, the sealing end face is open and non-contact operation is limited by speed. 2010 mechanical seal

On the other hand, at low speeds or even when stopped, the opening force of the seal end face is increased by adopting the hydrostatic effect and taking special measures for the seal. The opening of the sealing end face can be illustrated by the limit curve, as shown in Figure 4-29.

Figure 4-29 Operation limit of gas film seal for top-inserted kettle (DIN)

Generally speaking, the maximum possible sliding speed of the seal is not limited by the performance of the gas film seal, but by the sealing element such as the rotating spring. The actual situation is that low-speed stirring reactors usually cannot achieve very high sliding speeds. For the sealing of the reaction kettle with hard and soft materials, the maximum possible pressure difference is 1 MPa.　　984.html,

Pressurized double end face gas film mechanical seal 　　 The key factor that affects the gas film mechanical seal is the seal arrangement method