The reason why the contact seal can play a sealing role is that the contact between the seal and the rotor enables the sealing function to be realized, as shown in the figure is the force diagram of the rotor. When the rotor is running, on the one hand, the radial vibration of the rotor changes the force on the sealing plate, which makes the displacement of the seal change in the radial direction, which will have a certain impact on the sealing performance of the seal. On the other hand, due to the rigidity of the seal, the radial vibration of the rotor is simulated. The interaction between the two determines the dynamic characteristics of the rotor and the sealing performance of the seal.
