Hydrodynamic radial bearing and centrifugal pump

Abstract

The invention provides a hydrodynamic radial bearing provided with an axial-flow pressurizing structure and a centrifugal pump. The hydrodynamic radial bearing comprises a shaft sleeve and a bearing body matched with the inside of the shaft sleeve; the bearing body comprises two opposite end surfaces and a side surface located between the two opposite end surfaces; and the axial-flow pressurizingstructure is arranged on the side surface of the bearing body, is close to at least one of the two opposite end surfaces and is far away from the central area of the side surface. Compared with the prior art, the hydrodynamic radial bearing has the advantages that a pressurizing device is added to the front part of the hydrodynamic radial bearing, the cavitation phenomenon which is caused easily in a general hydrodynamic bearing is restrained, and the reliability of the bearing is improved remarkably.

Description

technical field [0001] The invention relates to a bearing structure, in particular to a hydrodynamic radial bearing and a centrifugal pump using the hydrodynamic radial bearing. Background technique [0002] Centrifugal pumps have the characteristics of long working life, flat head curve, and strong delivery capacity, and have been widely used in aerospace, petrochemical, fertilizer, pharmaceutical and other industries. [0003] Most centrifugal pumps use rolling bearings or sliding bearings as the supporting bearings for the rotating shaft. However, rolling bearings or sliding bearings usually have the following defects: for example, the failure due to the continuous wear of the metal on the working surface, when the bearing is lubricated with a lubricant, there are disadvantages such as lubricant aging and high temperature dilution. [0004] This led to the use of a new type of hydrodynamic bearing in centrifugal pumps. A hydrodynamic bearing is a non-contact sliding bea...

AI Technical Summary

Problems solved by technology

However, rolling bearings or sliding bearings usually have the following defects: for example, due to the continuous wear and tear of the metal on the working surface, there are defects such as lubricant aging and high temperature dilution when using lubricants to lubricate the bearings.

When the liquid cavitates, part of the liquid changes into a gas. Since the specific volume of the gas is much larger than that of the liquid, the gas quickly occupies most of the volume in the cavity, and the supporting force of the liquid film drops rapidly or even disappears, which affects the hydrodynamic bearing. Stability at high speeds may even cause failure in severe cases

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