CZ40-315 machine pump bearing box bearing over temperature
Thread Content
The pump itself does not have a cooling system. The temperature of the front and rear bearings of the pump is 73°C, which is basically the upper limit of the rolling bearing temperature. How to solve the problem of high temperature?
What is the medium temperature? The name of the medium and the inlet pressure. Are the bearings made of 6308 or cylindrical roller bearings + double row angular contact ball bearings NU308+3308?
1. Check whether the breathing cap is unobstructed； 2. Check whether the lubricating oil has deteriorated ； 3. Ensure that the bearings are not abnormally damaged or impurities are not entered during assembly. ； 4. Ensure that there are no major fluctuations in import traffic, etc.
Is it because the drive end bearing heats up after starting to use it? And if only the bearing heats up, is the temperature of the entire bearing frame high?
Is the bearing assembly clearance appropriate? Bearing running inner ring or outer ring ； The interference between the outer ring of the bearing and the bearing compartment is too large or the interference between the inner ring and the shaft is too large. ； Is the axial displacement of the pump appropriate? 0.1mm--0.20mm ； Is the lubricant grade suitable? Is the oil slinger installed? Is the oil level appropriate?
There are many reasons for high bearing temperature. You need to check the medium temperature, axial clearance, and lubrication conditions. When replacing a new impeller, you also need to consider the axial force.
It is recommended to consider bubble ZPTK's reply, which makes sense. I have encountered such a situation before. Causes the bearing to hold the shaft. The reason is that the original design support bearings bear axial forces, causing the operating temperature to increase.
When did this problem occur with this pump, and how long had it been operating normally?
In addition to shaft system problems, you should also check whether the impeller has a balance hole, and if so, whether it is enough to eliminate the axial force [personal opinion is for reference only]