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Because the vacuum pump will form when it works at high speed, the bearing supporting the rotor will be heated if the rotor speed is too fast. There are several reasons for bearing overheating during the operation of vacuum pump

1. Valve plate cracking: when a valve plate cracks, 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 long-term operation will make the bearing temperature rise. 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 sealing water channel is blocked, air will be drawn into the pump body from these damaged gaps, which will form the suction and exhaust performance of the pump. If only one side of the 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. Bearing preload is too large: this situation will promote bearing clearance reduction or no clearance, forming bearing temperature rise.

4. Sensational effect: when the pump body or bearing is a big sensation, the appearance of bearing temperature is too high. Check the pump body to find out the cause of the sensation and eliminate the sensation, then the bearing temperature will recover.

5. Smooth appearance: the increase of smooth grease is too large or too small, or the type of smooth grease does not meet the requirements, and its use time is too long. Maybe the grease is polluted and will form bearing heating. At this point, you should check the type of grease, ask the manufacturer for the appropriate dosage, and adjust the grease to recover the bearing temperature.

6. Bearing damage: Bearing rollover body and bearing cage damage will be accompanied by the appearance of bearing overheating. Bearing damage, it is necessary to replace the new bearing in time.