Spiral groove plain bearings and centrifugal pumps

Abstract

The invention relates to a spiral groove sliding bearing and a centrifugal pump. The spiral groove sliding bearing comprises an annular oil groove, bearing outer rings and a bearing inner ring. The annular oil groove is annularly formed in the outer side of a bearing body and used for containing lubricating oil supplied by the outside. The bearing outer rings are located on the outer sides of the portions, on the two sides of the annular oil groove, of the bearing body and arranged on an outer bearing pedestal in a sliding manner; and when the spiral groove sliding bearing and the bearing pedestal rotate relative to each other, outer layer oil films are formed between the bearing outer rings and the bearing pedestal through the lubricating oil supplied to the annular oil groove. The bearing inner ring is located on the inner side of the bearing body and arranged on an external high-speed main shaft in a sliding manner; a plurality of spiral grooves are formed in the inner wall of the bearing inner ring and communicated with the annular oil groove though an oil hole; and when the high-speed main shaft and the spiral groove sliding bearing rotate relative to each other, an inner layer oil film is formed between the bearing inner ring and the high-speed main shaft in the manner that the lubricating oil supplied by the annular oil groove passes the oil hole. By means of the spiral groove sliding bearing and the centrifugal pump, the mechanical efficiency of the centrifugal pump is improved, reliability is improved, and the vibration and noise level of the high-speed centrifugal pump is reduced.

Description

technical field [0001] The invention relates to a spiral groove sliding bearing and a centrifugal pump, in particular to a spiral groove sliding bearing with inner and outer oil films and a high-speed centrifugal pump using the bearing. Background technique [0002] High-speed centrifugal pumps have a wide range of applications and are widely used in petrochemical, pharmaceutical, metallurgy, papermaking, electric power, environmental protection, food and light industry and other industrial fields. [0003] The high-speed main shaft of the existing high-speed centrifugal pump is supported by a spiral groove sliding bearing, and the existing spiral groove sliding bearings are fixed on the bearing seat by fixing devices (such as screws, pins), so there is only a single layer between the high-speed main shaft and the high-speed main shaft. Oil film. [0004] With the increase of rotational speed and radial load, the friction force increases, resulting in large friction power c...

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Problems solved by technology

[0003] The high-speed main shaft of the existing high-speed centrifugal pump is supported by a spiral groove sliding bearing, and the existing spiral groove sliding bearings are fixed on the bearing seat by fixing devices (such as screws, pins), so there is only a single layer between the high-speed main shaft and the high-speed main shaft. oil film

[0004] With the increase of speed and radial load, the friction force increases, resulting in large friction power consumption and low mechanical efficiency.

Moreover, since the friction power consumption is all converted into heat, the temperature of the oil film between the high-speed spindle and the spiral groove sliding bearing rises, and the circulation volume of the lubricating oil is limited by the geometric parameters of the bearing, which leads to high-temperature carbonization of the lubricating oil and eventually causes the bearing to fail.

In addition, under the condition of high speed and heavy load, the vibration and noise of the high speed centrifugal pump are very large.

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