Pressure expander of centrifugal compressor

Abstract

The invention discloses a pressure expander of a centrifugal compressor. The structure of the pressure expander is improved, and high application value is achieved for further improving working performance of the pressure expander. A short blade is arranged in runners of every two adjacent long blades; the front edges of the long blades are curved surfaces and are arranged obliquely, and the included angles between front edge lines and the central axis of a wheel disc are 6 degrees to 8 degrees; the radius of curvature of the front edges of the long blades is gradually increased from the wheel disc to a wheel cover; each long blade is provided with three broken-line-shaped channels penetrating through a corresponding pressure surface and a corresponding suction surface; tail edge wing tips are arranged on the portions, located on the pressure surfaces, of the rear edges of the long blades. Occurrence of separation of airflow on the surfaces of the blades is restrained through the short blades in the runners of the adjacent long blades; the pressure differences between the pressure surfaces and the suction surfaces are reduced through the broken-line-shaped channels, the adverse pressure gradient is reduced, and separate airflow on boundary layers of the suction surfaces at the tails of part of the blades is effectively blown away; increase of wing tip vortexes generated by the pressure differences between the suction surfaces and the pressure surfaces on the rear edges of traditional wing-type blades can be restrained through parabola-shaped winglets on the tail edges.

Description

technical field [0001] The invention belongs to the field of ventilation equipment, and relates to a centrifugal fan, in particular to a diffuser of a centrifugal compressor. Background technique [0002] As an energy conversion device, the centrifugal compressor mainly drives the movement of the gas in the impeller channel through the rotation of the impeller, and converts the mechanical energy of the prime mover into the energy of the gas. Due to its high pressure, wide range of stable working conditions, simple structure, and easy maintenance, centrifugal compressors are widely used in industries such as petroleum, aerospace, metallurgy, chemicals, and mines, and play an important role. [0003] In centrifugal compressors, the diffuser is generally divided into two types: vaneless diffuser and bladed diffuser. The vaneless diffuser is usually composed of two flat walls forming an annular channel. The structure of the vaneless diffuser is simple, the cost is low, the per...

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Problems solved by technology

[0006] The object of the present invention is to provide a diffuser for a centrifugal compressor in order to solve the problem that the air flow angle at the inlet of the diffuser is too large under the condition of small flow. The direction of the guided airflow changes, changing the angular distribution of the airflow in the diffuser channel, enabling more airflow to flow along the airflow surface, and inhibiting the occurrence of airflow separation on the blade surface, which not only improves the working efficiency of the diffuser, but also increases Wider range of work

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