If something is used for a long time, it is inevitable that it will be damaged. Vacuum pumps are widely used in many industrial fields, so what should be done if vacuum pumps are damaged? The maintenance methods for vacuum pumps have already been introduced earlier. Today, let's learn about two common sense errors in vacuum pump maintenance together.
Error 1: The sealing effect is better when the compression amount is large than when the compression amount is small
When installing mechanical seals, many vacuum pump maintenance personnel often subjectively believe that a large compression is better than a small compression for better sealing effect, but in fact, this is not the case. Excessive compression of mechanical seals results in excessive pressure on the end face, leading to an increase in the temperature of the friction pair, a decrease in the viscosity of the liquid film on the sealing end face, vaporization, damage, and even wear and deformation of the sealing end face. The elastic components of the mechanical seal lose their elasticity, ultimately leading to seal failure. However, the compression amount of mechanical seals should not be too small. If the compression amount is too small, the medium pressure may fluctuate or the pump may stop, which can easily lead to seal leakage. In actual maintenance, the compression amount of mechanical seals should be based on the values given in the mechanical seal user manual.
Error 2: Adjusting the pump bearing bracket bolts during alignment
When repairing a vacuum pump, assemble the rotor, pump cover, bearing bracket, and other components into the pump casing according to the assembly sequence of the components. By relying on the sealing fit between the pump casing and pump cover, ensure the coaxiality of the impeller ring and the pump body ring. Use the gasket between the pump casing and pump cover to adjust the axial position of the impeller. After adjusting the coaxiality and axial position of the impeller, tighten the pump casing and pump cover together with bolts, and then tighten the pump cover and bearing bracket together with bolts. Finally, install the coupling and align it. When aligning, adjust the motor, first adjust the axial clearance to make the two coupling halves parallel, and then adjust the radial clearance to make the two coupling halves coaxial. Some vacuum pump maintenance personnel often adjust the tightness of the fastening bolts between the pump cover and bearing bracket to find the correct position when adjusting the motor to meet the requirements. The consequence of doing so is that due to different tightening degrees of the bolts, the motor often produces noise and vibration, and in severe cases, it can cause damage to the entire pump.
