Thread Content
I. Bearing temperature standards – Pump bearing temperature standards 1. GB3215-82 4.4.1 During operation of the pump, the maximum temperature of the bearings shall not exceed 80°C. 2. JB/T5294-91 3.2.9.2 The temperature rise of the bearings shall not exceed 40 degrees above the ambient temperature, with the maximum temperature not exceeding 80°C. 3. JB/T6439-92 4.3.3 When the pump is operating under specified conditions, the surface temperature of the internal bearings shall not be 20°C higher than the temperature of the medium being transported, with the maximum temperature still not exceeding 80°C. The surface temperature rise at the outer surface of the external-mounted bearing should not exceed 40°C above the ambient temperature. The maximum temperature shall not exceed 80°C. 4. JB/T7255-94 5.15.3 Operating temperature of bearings. The temperature rise of bearings shall not exceed 35°C above the ambient temperature, with the maximum temperature not exceeding 75°C. 5. JB/T7743–95 7.16.4: The temperature rise of bearings shall not exceed 40°C above the ambient temperature, and the maximum temperature shall not exceed 80°C. 6. JB/T8644–1997 4.14: The temperature rise of bearings shall not exceed 35°C above the ambient temperature, with the maximum temperature not exceeding 80°C. II. Regulations regarding motor bearing temperatures, causes of abnormalities, and corrective actions: According to the regulations, the maximum temperature for rolling bearings shall not exceed 95°C, while the maximum temperature for sliding bearings shall not exceed 80°C. And the temperature rise shall not exceed 55°C (the temperature rise is the bearing temperature minus the ambient temperature during testing) ； (1) Reason: The shaft is bent, and the center line is inaccurate. process ； Find the center again. (2) Reason: The base screws are loose. Treatment: Tighten the foundation screws. (3) Reason: The lubricating oil is not clean. Solution: Replace the lubricating oil. (4) Reason: The lubricating oil has been in use for too long and has not been replaced. Treatment: Wash the bearing and replace the lubricant. (5) Reason: Damage to the balls or rollers in the bearing. Solution: Replace with a new bearing. According to the **standards**, it falls under Class F insulation with Class B testing requirements; the motor’s temperature rise is controlled at 80K (using the resistance method) or 90K (using the component method). Considering an ambient temperature of 40°C, the maximum operating temperature of the motor must not exceed 120/130°C. The maximum allowable bearing temperature is 95 degrees. Use an infrared thermometer to measure the temperature of the outer surface of the bearing housing; empirically, the maximum temperature at the highest point of a 4-pole motor should not exceed 70°C. For the motor itself, no monitoring is required. After the motor is manufactured, under normal circumstances its temperature rise remains relatively constant; it does not change suddenly or increase continuously as the motor operates. Bearings are wear-prone components that require inspection.