A centrifugal compressor structure with automatic balance of axial force

Abstract

The invention belongs to the field of fluid machinery, and relates to a centrifugal compressor structure whose axial force can be automatically balanced. The first-level impeller and the second-level impeller are respectively installed, and the first-level impeller and the second-level impeller are respectively located in the first-level volute and the second-level volute. A secondary shaft seal is arranged between the body and the secondary volute. The invention controls the wheel back pressure of the first-stage impeller and the second-stage impeller by adjusting the intake pressure of the first-stage shaft seal and the second-stage shaft seal. The axial force generated by the front and rear pressure difference is balanced out, avoiding the wear and failure of the centrifugal compressor due to the unbalanced axial force, and improving the performance and service life of the compressor. At the same time, the wheel back can be used as a thrust plate, and the thrust bearing is eliminated, which improves the positioning accuracy of the impeller and the compactness of the whole machine.

Description

technical field [0001] The invention belongs to the field of fluid machinery and relates to a centrifugal compressor structure whose axial force can be automatically balanced. Background technique [0002] As a kind of fluid machinery, centrifugal compressors are widely used in metallurgy, petrochemical, natural gas transmission, refrigeration and power industries, and play a vital role in promoting economic development. [0003] The increase of gas pressure in the centrifugal compressor is due to the fact that when the gas flows through the impeller, the high-speed rotation of the impeller does work on the gas, which increases the pressure of the gas. When , the flow velocity of the gas gradually decreases, and the kinetic energy is converted into pressure energy to further increase the pressure. [0004] Traditional centrifugal compressors run smoothly under design conditions, but there are often some shortcomings and deficiencies in non-design conditions. Bearing wear i...

AI Technical Summary

Problems solved by technology

[0004] Traditional centrifugal compressors run smoothly under design conditions, but there are often some shortcomings and deficiencies in non-design conditions. Severe bearing wear affects the performance and life of the compressor

In addition, the traditional centrifugal compressor is also prone to the problem of unbalanced axial force when the pressure difference between the impeller and the back side of the wheel is too large under high pressure conditions.

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