Application of staggered spiral type design on volute

Abstract

The invention belongs to design methods of a volute of a centrifugal compressor, and particularly relates to an application of staggered spiral type design on volute. Spiral lines is designed as connecting lines of centers of each cross section of the volute, and the spiral lines spreads circumferentially from the volute. The volute is divided into 8-12 cross section positions circumferentially, central line of each cross section shifts 2-5mm along a shaft line with respect to the central line of the previous cross section, and a transverse volute tongue structure is formed. The transverse volute tongue is formed by means of shifting central lines of cross sections, and thus the volute is avoided from interfering with a chimney fan, an initial small cross section of the volute is protected, air is guided to flow, and efficiency is improved. The initial small cross section of the volute is protected by removing the small cross sections of 0-10 degrees, and thus flow is improved, and volute size is reduced. The volute chimney fan of the centrifugal compressor is smoothly connected with the volute which is designed in a staggered spiral method, initial shape line of the chimney fan is in accordance with air flow direction at the outlet of the volute, and impact loss is reduced.

Description

technical field [0001] The invention belongs to the design method of the volute of a centrifugal compressor, in particular to the application of a dislocation spiral design on the volute. Background technique [0002] In the design process of centrifugal compressors, in order to pursue a high-efficiency mode, structural optimization and improvement measures are often taken on the volute in order to tap its possible energy-saving potential, thereby improving the overall operating efficiency of the unit. In the design of centrifugal compressors, it is noted that the design of the volute often has certain particularities. Since the air outlet tube eats up a large part of the small section of the volute, this part of the air flow directly enters the outlet tube after flowing out of the diffuser. , so it impacts the main airflow of the air outlet, resulting in a large airflow mixing loss. How to reduce the trouble of air mixing loss is a serious problem encountered by those skil...

AI Technical Summary

Problems solved by technology

[0003] When designing the volute of a centrifugal compressor, part of the small section of the air outlet is often cut off, and a connected area is formed through the cut surface between the two, which forms the internal circulation flow of the volute, resulting in internal leakage loss

At present, the aerodynamic efficiency of the volute has been improved by changing the cross-sectional area of ​​the volute, the structure of the volute tongue and the starting angle, and a large improvement has been achieved, but there is still a certain flow confusion area in the air outlet part

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