SU1147855A1 - Centrifugal compressor - Google Patents

Abstract

CENTRIFUGAL COMPRESSOR, which contains a snail housing with an outlet fitting and an impeller and a blade mounted in the housing; a precise diffuser with constant entry angles and variable exit angles of the blades. e27i characterized in that, in order to increase the efficiency, the diffuser vanes have exit angles determined from the equation, 4 "e-qen0-0.4" -t-f / oC where o is the coefficient defined by | the inequality O w 2 b is the angle between the radius of the wheel, perpendicular to the axis of the nozzle, and the radius passing through the exit edge of the i -th blade in the direction of the development of the cochlea (Las, glad;

Description

The invention relates to compressor engineering and can be used in diffusers of centrifugal compressors.

A centrifugal compressor is known, comprising a snail housing with an outlet pipe and an impeller and a blade diffuser with constant entry angles and variable exit angles installed in the housing ^! SPN blades A disadvantage of such a compressor is that the output angles of the diffuser blades are selected without taking into account the mutual influence of the impeller, diffuser and the snub body. This leads to a decrease in compressor efficiency due to non-optimal flow around the diffuser blades.

The purpose of the invention is to increase

Compressor efficiency.

This goal is achieved by the fact that in a centrifugal compressor containing a snug housing with an outlet nozzle and an impeller and a blade diffuser with constant entry angles and variable exit angles of the blades installed in the housing 1, the latter have exit angles determined from the equation;

where o (° ^ 44

is the coefficient determined by the inequality 0 <о (ί 2,

- the angle between the radius R _{o of the} wheel 3, perpendicular to the axis of the pipe 2, and the radius R. passing through the output edge 6 of the blades 5 in the direction of development of the cochlea 7 of the housing 1, rad;

- theoretical angle of exit of the blades 5 of the diffuser 4.

The constant angles of entry of Ocdz can also be selected by the influence of the working diffuser 4 in the following formula, taking into account the reciprocal wheel 3, the scapula of the cochlea 7 after ^{bC <} AZ is equal to the following where a is the coefficient determined by the inequality 0 <4 4;

Θ is the angle between the radius of the wheel perpendicular to the axis of the nozzle and the radius passing through the input edge of the jth blade in the direction of development of the cochlea, rad ·, ot _{A +} is the theoretical angle of exit of the diffuser blades. The drawing shows a centrifugal compressor, a cross section.

The centrifugal compressor comprises a snubber housing 1 with an outlet pipe 2 and an impeller 3 and a blade diffuser installed in the housing 1

Claims (1)

A CENTRIFUGAL COMPRESSOR containing a snail housing with an outlet nozzle and an impeller and a blade diffuser with constant entry angles and variable exit angles of the blades installed in the housing, characterized in that, in order to increase the efficiency, the diffuser blades have exit angles determined from the equation ° ^ Λ4ΐ -th Kpb-ίΗα-Η / οί ^ where a is the coefficient determined by _{t by the} inequality 0 Z «2; Θ - angle between the radius of the wheel, perpendicular to the nozzle axis and a radius passing through the i-th trailing edge of the blade in the direction e of the cochlea SRI korpu- ⁴⁰ ca, rad; </ _Л 4 - theoretical angle of exit of the diffuser blades. SU ,,, 1147855 1147855 2 fuser 4 with constant entry angles and variable exit angles oC ₊₁ · blades 5. The blades 5 of the diffuser 4 have exit angles determined from the equation