Since the vacuum pump is formed at a high speed, the rotor speed is too fast to form a bearing that supports the rotor. There are usually several reasons for bearing overheating during vacuum pump operation:
1. Smooth appearance: the increase of smooth grease is too large or too small, or the smooth grease type does not match, and its use time is too long, or the smooth grease will be contaminated to form bearing heat. At this moment, you should check the smooth grease type, ask the manufacturer the appropriate amount, adjust the smooth grease to recover the bearing temperature.
2. Sensation: When the pump body or bearing is sensational, the bearing temperature will be too high. Look at the pump body to find the cause of the sensation, and eliminate the sensation, then the bearing temperature will recover.
3. Valve cracking: When a valve disc is cracked, the pressure on both sides of the impeller will be unbalanced, the axial force will occur in the rotor, and the bearing load will be intensified. The long-term operation will increase the bearing temperature. In this case, the valve should be replaced in time.
4. The bearing pre-tightening force is too large: this situation will promote the bearing clearance reduction or no play, forming the bearing heating.
5. Shaft end seal failure: When the shaft end seal packing is damaged or the sealing water passage is blocked, air is formed from these damaged gaps and sucked into the pump body, which will form the suction and exhaust performance of the pump. If only one side of the seal fails, the pressure imbalance on both sides of the impeller will be formed, and the axial force of the rotor will increase the bearing load, thereby increasing the bearing temperature.
6, bearing damage: Bearing rolling body and bearing cage damage will be accompanied by the appearance of bearing overheating. Bearing damage is necessary to replace the new bearing in time.
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