Causes of vibration of high-speed centrifuge components and maintenance methods

High-speed centrifuges are prone to component vibration during use and operation. Vibration of the centrifuge may cause the centrifuge to affect the centrifuge during use. What is the cause of vibration of the high-speed centrifuge drive components? Shanghai Lixinjian Centrifuge This problem was studied for this purpose and possible maintenance methods were provided.

The drive components of the high speed centrifuge were analyzed. According to the analysis, the cause of the vibration is multi-factor, which mainly includes the residual unbalance of the rotor, the residual unbalance of the rotor of the motor, the connection mode of the motor and the drive assembly, and the setting of the damper. According to the kinetic principle, the equation for the rotor when operating at a certain speed is G + M (e + y) CO : (y + y).

The most influential one is the eccentricity e and the deflection Y of the rotor, which are related to the manufacturing precision of the rotor, the geometry of the drive shaft and the bearing position of the bearing. The source will cause simultaneous radial and axial vibrations, mainly in the radial direction. Based on this principle, we carefully analyzed the original design and found that the original structure does not have any damping device in the radial direction, and the vibration is repeated in the axial direction.

Second, the influence of the rotor and the rotor cover was found to have a clearance of 2 ram between the original rotor and the rotor cover. Third, the impact of the flexible coupling. Since the rotor and the motor always have different levels of residual unbalance, the two imbalances are two different sources. In a high-speed centrifuge with a direct drive structure, the two source forks have to be connected, which requires designing a coupling that effectively isolates the two sources. The original design of the coupling is a nylon sleeve with a square hole. Although the nylon sleeve can provide a certain damping and vibration isolation effect, it cannot meet the requirements for use here. In response to the above problems, we first added a rubber isolation ring to the original drive structure to isolate the radial vibration. The gap between the rotor and the rotor cover was reduced from the original 2ram to 0.1mm. The coupling was made of the original nylon sleeve. Instead, as shown in Figure 2 we call the structure of the Vientiane coupling.

After the above modification, after the test, the rotational speed reached 20000 rPm in less than 3 minutes, and the self-vibration acceleration was 4 g on the drive motor. Thus, the drive components of the high-speed centrifuge did not vibrate.