Adjustable balance disk seal of centrifugal compressor

Abstract

The invention provides an adjustable balance disk seal of a centrifugal compressor and belongs to the technical field of mechanical seal. The adjustable balance disk seal of the centrifugal compressor mainly comprises a movable-ring holder, an adjustable-static-ring holder, a movable ring and an adjustable static ring. The movable-ring holder is located at the outlet side of a last-stage impeller of the centrifugal compressor and fixed to a rotating shaft through a locking ring and rotates along with the rotating shaft. The adjustable-static-ring holder provided with an adjustable air flow channel is fixed to the portion, behind the last-stage impeller of the centrifugal compressor, of a body of the centrifugal compressor and is static relative to the body of the centrifugal compressor. The movable ring is fixed to the moveable-ring holder. An adjustable isolating air film is formed between the movable ring and the adjustable static ring. The adjustable static ring is installed on the adjustable-static-ring holder in a floating mode. A pressure equalizing groove and a throttling hole are formed in the end face of the adjustable static ring, and the adjustable air flow channel is formed in the adjustable-static-ring holder. The adjustable balance disk seal has the advantages of start at static pressure and operation at dynamic pressure. During operation of the centrifugal compressor, active adjustment of the characteristic of the seal can be achieved, it is guaranteed that the seal stably operates, the seal leakage amount is reduced, and the efficiency of the centrifugal compressor is improved. In addition, the seal has the functions of a balance disk of the centrifugal compressor, and the structure of the centrifugal compressor is simplified.

Description

Technical field [0001] The invention is a controllable seal suitable for the balance disc of a centrifugal compressor. Its main function is to realize the seal of the compressor balance disc shaft end and replace the traditional balance disc device to achieve axial force balance. The application field can be extended to steam turbines, Rotating machinery such as gas turbines and turbo pumps. Background technique [0002] As a large-scale power unit, centrifugal compressors are widely used in petrochemical industries such as synthetic ammonia. Compressors have high investment costs and high energy consumption. The stability and efficiency of their operation directly affect the reliability of the entire production line. Therefore, they are the core equipment of many petrochemical process industries. When the compressor is compressing gas, a certain axial force will be generated due to the accumulation of pressure difference of the multi-stage impeller. At present, most of the axi...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to invent an adjustable gas end face sealing device for the balance plate of a centrifugal compressor, which can effectively solve the problem of large seal leakage, realize the goal of actively regulating the sealing film pressure and gas film stiffness, and achieve the balance plate seal at The effect of static pressure start and dynamic pressure operation under the condition of fluctuating working parameters

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