Improved axial force balancing structure of shielded pump

Abstract

An axial power balance device for a shield pump comprises pump body, pump axial, impeller and bearing support. The bearing support is fixed in the pump body. The pump axial is installed in the bearing support. The impeller fits over the axial and in front of the bearing base. On the front cover of the impeller installed a convex table. A column chamber is formed to the front of the impeller in the pump body. The column table is in the chamber and leaves a fixed gap to the chamber. On the back cover of the impeller fixed a convex column circle. A second column chamber is formed to the back of the impeller in the pump body. A fixed second gap is formed between the second chamber and the circle. A convex part on the bearing support faces to the impeller back cover. The gap between the convex parts to the back cover is axially adjustable. The axial gap and the radial gap form a hydraulic pressure balance system to balance the axial power and reduce friction.

Description

technical field [0001] The invention relates to a canned pump, in particular to an improved axial force balance structure of the canned pump. Background technique [0002] In the prior art, the shielded pump has no shaft seal device, the motor and the pump are coaxial, and the stator and rotor are separated from the conveying medium by shielding sleeves. The motor cooling and bearing lubrication use its own conveying medium, and the shaft support adopts sliding bearings. When the canned pump is in operation, when the pressure on the impeller front cover and rear cover is unbalanced, an axial force will be generated, and the axial force will act on the thrust bearing through the rotor assembly. The existing pump axial force balance technology includes the balance hole method and the back blade method. The rear sealing ring is used to separate the high-pressure chamber on the back of the impeller to form a low-pressure chamber. A balance hole is drilled in the low-pressure cha...

AI Technical Summary

Problems solved by technology

Therefore, none of the existing canned pumps can effectively avoid the contact between the thrust plate and the thrust surface of the thrust bearing, resulting in wear of the thrust bearing

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