Double gap high flow resistance balance device

Abstract

The invention relates to a double-gap high-flow-resistance balance device which is characterized in that a balance drum is sequentially provided with a plane area A, a water tank area B and a double-gap irregular zigzag area C. The plane area A is matched with a balance drum seat inner hole gap to form a radial gap S1 used for allowing balance return water to flow in smoothly. The water tank area B is matched with the balance drum seat inner hole gap to form a radial gap S2 used for allowing fluid to flow axially, increasing gap resistance and forming a water bearing. The double-gap irregular zigzag area C is matched with the balance drum seat inner hole gap to form two double-gaps S3 and S4 used for lowering fluid leakage amount and fluid pressure pulsation. Compared with the prior art, the double-gap high-flow-resistance balance device is novel in structure and worthy of popularizing, axial force balance effect can be guaranteed, pump leakage amount can be lowered, the radial gap between the balance drum and a balance drum seat is increased, rotor stability is increased, and pump reliability is increased.

Description

technical field [0001] The invention relates to an axial force balancing device for pumps, in particular to an axial force balancing device suitable for vertical multistage pumps. Background technique [0002] Due to the asymmetric pressure distribution on the outer surface of the front and rear cover plates of the impeller, a large axial force will be generated on the pump rotor, and the axial force can generally reach more than ten thousand N. The vertical pump set generally uses a balance drum to balance the axial force. . The structure of the existing balance device generally adopts a simple single-gap planar structure, and there will be a large leakage in the radial gap between the balance drum and the balance drum sleeve, and the leakage can reach 25% of the pump design flow. From the perspective of reducing leakage loss and improving the ability of the balance drum to balance the axial force, the radial clearance should be as small as possible. The friction of the b...

AI Technical Summary

Problems solved by technology

From the perspective of reducing leakage loss and improving the ability of the balance drum to balance the axial force, the radial clearance should be as small as possible. The friction of the balance drum sleeve will cause adverse effects such as vibration and noise of the equipment, thus reducing the reliability of the equipment.

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