The manufacturer of silent oil-free vacuum pump will let you know that because the vacuum pump will form when it works at high speed, the bearing supporting the rotor will heat up if the rotor speed is too fast. There are several reasons for bearing overheating during vacuum pump operation.
1. Valve disc cracking
When a valve disc cracks, the pressure on both sides of the impeller will be unbalanced, and the rotor will have axial force, which will aggravate the bearing load, and the long-term operation will increase the bearing temperature. In this case, the valve plate should be replaced in time.
2. Shaft end seal failure
When the shaft end seal packing is damaged or the seal water channel is blocked, air will be sucked into the pump body from these damaged gaps, which will form the suction and exhaust performance of the pump. If the side seal fails, the pressure on both sides of the impeller will be unbalanced, and the axial force of the rotor will occur, which will aggravate the bearing load and increase the bearing temperature.
3. The bearing preload is too large, which will promote the reduction of bearing barriers or no clearance, resulting in bearing temperature rise.
4. Sensational influence
When the pump body or bearing is a big sensation, the appearance of excessive bearing temperature will occur. Check the pump body to find out the cause of the sensation, eliminate the sensation, and the bearing temperature will recover.
5. Smooth representation
The increase of smooth fat is too large or too small. Or the type of smooth grease is inconsistent, its use time is too long, or the smooth grease is polluted, which will form bearing heating. At this moment, you should check the type of smooth grease, ask the manufacturer for the appropriate dosage, and adjust the smooth grease to recover the bearing temperature.
6. Bearing damage
The damage of bearing rollover and bearing cage will be accompanied by the appearance of bearing overheating. If the bearing is damaged, it is necessary to replace the new bearing in time.