SU1456645A1 - Vane diffusor of centrifugal compressor - Google Patents

Abstract

The invention makes it possible to reduce the dimensions of the diffuser and to maintain the efficiency of the compressor when the diffuser 4 is built with a ratio of the outer and inner radii equal to 1.16 ... 1.25. S-shaped blades 2 are installed between the side walls 1. In cross section of the inlet yiacTox 3 and outlet 4 are outlined by arcs of circles with radius pj and p, and the angle ci of the blades installation is made in accordance with the formula, as described in the description wheels. The blades ensure the preservation of the efficiency of the compressor with the small dimensions of the diffuser by increasing the length of the interscapular channels and non-separating flow in them. 1 il. 2 1 s (L SL O) O5 4; sd

Description

The invention relates to a compressor industry and to be used in blade diffusers of centrifugal compressors.

The purpose of the invention is to reduce the dimensions of the diffuser and preserve the efficiency of the compressor when performing a diffuser with a ratio of external and internal radii equal to 1.16 ... 1.25.

The drawing shows a diffuser, a cross-section.

.

oil, arccos

mRiR4 (l-K) cose6) - (K R4 -Ee) co5C1 4 - () R4

The centrifugal compressor blade diffuser contains side walls 1 and blades 2 installed between them, each of which has an S-shaped form with smoothly coupled inlet 3 and outlet 4. The inlet 3 and outlet sections 4 of each blade 2 in cross section are outlined by circular arcs with radii o and p4, respectively, and the angle about to the installation of blades 2 at the point A of conjunction of sections 3 and 4 is determined by L1P formula 15

.

se6) - (K R4 -Ee) co5Cl 4 -m) R4

m 0,18 ... 0,28 - the ratio

radii of PJ and p, arcs of circles of input 3 and output 4 plots. R and R respectively

the inner and outer radii of the diffuser, K is the ratio of the radius R, the circumference of the location of the mating points A of the input 3 and output 4 plots and the outer radius R, of the diffuser, equal to 0.89 ... 0.91;

- respectively, the input and output angles lop-. . current 2.

The diffuser works as follows.

The working fluid enters the diffuser radially in the longitudinal section of the diffuser. When the flow of the blades 2, forming the interscapular

with j and

oi ,, arccos

inRiR4 (l-K) cosi, - (K E4 -Kz) coBe. - (K + mK - m) R

.

20 diffuse channels, flow deceleration occurs and a corresponding increase in static pressure.

The S-shaped blades of the proposed design allow to increase the length of the interscapular canals and provide the specified rotation and expansion of the flow, so that the radial dimensions of the diffuser can be reduced to a ratio of the inner and outer radii of 1.16 ... 1.25, while maintaining . Efficiency of the compressor.

Claims (1)

Invention Formula The centrifugal vane diffuser 35 of the compressor contains side walls and blades installed between them, each of which is S-shaped with smoothly coupled inlet and outlet sections, so that, in order to reduce overall dimensions diffuser and preservation of compressor efficiency at fit with the ratio of outer and inner radii equal to 1.16 ... 1.25, input and output: one areas of each blade are outlined in cross section by arcs of circles, determined by pho - 50 .mule. 40 45  1456645 -n 10 n 00 circles are located-0, 18 ... 0.28 - the ratio of the radii “and the points of contact of the circles of the entrance” and the input and output and output exit sections and plots; outer radius diffuser equal to RJ and R are respectively intra-O, 89 ... O 91 The external and external oL are the entrance walls of the diffuser, respectively; young and exit angles K is the ratio of the radius of ok-blades.