Axial force of cantilever pump
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This post was last posted by Bubble_ZPTK on 2019-7-25 12:01 The editor has a very simple question. Ordinary cantilever pumps are said to be positioned at the shaft end. The bearing gland fixes the bearing outer ring and the locking nut fixes the bearing inner ring. However, the problem is that the axial force generated by the pressure difference on both sides of the impeller is transmitted to the shaft, and the shaft can move along the axial direction. The so-called positioning bearing only fixes the position of the bearing outer ring. The bearing itself has clearance, and the inner ring can still move in the direction of the axial force. How can it be called a positioning bearing? Or is it that the axial force is not enough to cause displacement of the shaft, or that the displacement is less than the clearance of the bearing itself? Please give me an answer.
Does the bearing heat up when it rotates? Does it expand after doing so?
It’s not just about the equipment in operation, it’s just about the bearings counteracting the axial force.
Where does the axial force come from when the pump is not running?
……Assume it is running, the gap between the bearing and the gland is adjusted to the appropriate range, and the thermal expansion is also taken into account. I have been talking about the issue of axial force. The other parameters are appropriate by default\ud83e\udd14
I found the answer. According to what you said, when I couldn't pull the shaft out, the clearance of the bearing balls was gone. If it continued to run, it might burn. I'm asking because I don't understand. If you know the principle, you can choose to tell me or not. There's no need for this.
The inner ring can still move in the direction of axial force ------- Isn't the movement fixed by the paired angular contact bearings?
Hungry, your picture clearly shows a pair of angular contact bearings, which can balance axial force.
Balance holes are generally opened on the impeller to balance the axial force. The remaining small force acting on the bearing has little effect on the bearing.
Take a ball bearing and throw it around to see if the inner and outer rings can fall out.