Axial force balancing method for shielded pumps
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As shown in the diagram is the structure of a multi-stage shielded pump. So how is the axial force balanced, and what is the working principle of the balance ring shown in the diagram?
Please refer to the forum post on the working principle of balance weights; they are generally used in combination with balance rings.
It’s a bit different from what we see in daily life on the drawings. Could you explain that?
The balance disc and balance ring form a balance system to balance the axial force
This post was last edited by backcat666 on 2017-9-28 21:52. Water enters the pump through the horizontal pipe at its left end, while the water exits from the vertically upward pipe at its right end! Thus, the direction of the axial force is toward the left along the axis. The final impeller is equipped with a balance drum, and at the right end of this balance drum there is a balance tube that is connected to the pump inlet; as a result, the force acting on the balance drum is directed toward the right along the axis. The difference between these two forces constitutes the residual axial force, which acts toward the left along the axis. 473.01/473.02 represents the thrust plate fixed to the pump body, which serves to interact with the left thrust surface of the sliding bearing on the motor rotor in order to counteract the residual axial force!
This post was last edited by bxfigo on 2017-9-28 22:55
1. There is no balance tube connected to the pump inlet at the right end of the pump’s balance drum. 2. On the diagram, both thrust discs are located to the left of the thrust surface of the sliding bearing; they can only counteract axial forces directed to the right, and not those directed to the left, right?
The fact that the balance tube is not marked on the diagram does not mean it is absent； The thrust disc is not fixed to the rotor, but rather to the housing!
This pump indeed doesn’t have a balance tube; I took it apart completely. Additionally, the thrust disc is fixed to the shaft and rotates with it.
Is the final impeller integrated with the balance drum? What medium is inside the chamber at the right end of the balance drum, and is there an outlet? What’s your WeChat ID?
The final impeller and balance ring (512.02) are connected together by bolts and rotate together with the shaft, while the balance ring (512.01) remains fixed and does not rotate.