Application of staggered spiral type design on volute

A helical, volute technology, applied in the application field of the dislocation helical design on the volute, can solve the problems of internal leakage loss and chaotic flow of the air outlet, so as to reduce the impact loss, improve the flow condition, and improve the flow field. Effect

CN103161761AActive Publication Date: 2013-06-19SHENYANG BLOWER WORKS GROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-06-19

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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.
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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...

Examples

Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Such as Figure 1~3 As shown, the helix is ​​used as the connection line of the centers of each section of the volute, and is expanded along the circumferential direction of the volute; the volute is divided into 8 to 12 section positions according to the circumferential direction, and then the centerline of each section is compared with the centerline of the previous section. Offset along the axis by 2 to 5 mm, and the connecting line of the centers of each section forms a helix, and then forms a structure of a transverse cochlear tongue.

[0022] The horizontal volute tongue is a method of offsetting the center line of the section of the volute. After avoiding the interference between the volute and the air outlet, the initial small section of the volute is preserved, that is, the small section of 0°~10° is cut off to guide Flow, improve efficiency,...