SU1714217A1 - Ejector - Google Patents

Abstract

The invention relates to inkjet technology and can be used in air conditioning systems and when pumping various media. The aim of the invention is to reduce noise, increase efficiency and reliability of operation. The ejector includes a housing 1, a mixing chamber 2 with a diffuser 3, a nozzle (C) 4 with noise-canceling triangular teeth 5 located around its input edge, while the ends of adjacent teeth are bent in opposite directions to the C 4 axis and to the wall of the mixing chamber 2. One ends of the teeth 5, bent to the axis C 4, are fastened together at a common point located on the axis C 4 at a distance from its cut

Description

The invention relates to inkjet technology and can be used in air conditioning systems and when pumping various media.

The aim of the invention is to reduce the noise level, increase the economy and reliability of the ejector.

FIG. 1 shows an ejector, longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2

The ejector includes a housing 1, a mixing chamber 2 with a diffuser 3, a nozzle 4 with circumferentially located noise edges triangular teeth 5, while the ends of adjacent teeth 5 are bent in opposite directions to the axis of the nozzle 4 and to the wall of the mixing chamber 2. The ends of tooth1..a8 5, bent to the axis of the nozzle 4, are fastened together at a common point 6 located on the axis of the nozzle 4 at a distance from the nozzle 4 (1.0-1.5) dsH, where den is the first diameter of the nozzle , and have an arc profile, while the centers of the blowing are located on the side facing the axis of the nozzle 4. And the other teeth are flat and bent from the axis of the nozzle 4 at an angle of 8-10 °,

The ejector works as follows.

The working stream of compressed gas accelerates in the nozzle to a sonic or supersonic speed. In addition, the static pressure is reduced in the jet due to the action of Bernoulli's law. Due to the resulting pressure gradient in the mixing chamber, between the jet area of the working air and the air injected, the flows are mixed, accompanied by significant noise generation. The greatest effect of reducing the noise of the jets is obtained when the jet is separated by a distance of (1.0-1..5) dan. Acoustic efficiency using a splitting of the HS stream of a number of smaller ones can be evaluated using a flash rate.

DE - lOlg

1 /.0.5

one

cfk-

)

.-} - -.,. I I -

Ff vnf

where D e - reduction of acoustic power, dB; k is a coefficient characterizing the relative proportion of small jets that determine the total acoustic power;

F (, DS, D are the diameters of the equivalent and initial jets, respectively;

n is the number of teeth bent to the axis of the mixing chamber.

By crushing the original jet into a number of smaller ones by alternately bending the teeth 5 to the restrictive wall of the mixing chamber 2 at an angle of 8-10 with respect to the axis of the camera 2 and bending them along an arc of a circle, the maximum is shifted to the axis of the chamber

emitter noise emission spectrum to higher frequencies:

f p f VIT,

where fp, f are frequencies of the noise of the fragmented and initial jet, respectively, Hz.

Fastening the inner teeth at one point, located at a distance (1.01, 5) dsH from the root of the teeth, increases the effect of jet separation, the reliability of the nozzle design to the effects of aerodynamic

ripple flow. At the same time, the outer teeth 5, bent against the wall of the mixing chamber 2 at an angle to its axis of 8-10 °, help to calm the flow of the flow-free flow, as well as smooth the pulsation in

airflow and suppression of discrete components in the noise spectrum of the ejector. As a result of the installation of the teeth at the exit of the ejector nozzle, noise reduction is provided for various operating modes.

without the occurrence of discrete components in the noise spectrum, as well as improving the efficiency and reliability of the ejector.

Claims (1)

Invention Formula The ejector, comprising a housing, a mixing chamber with a diffuser, a nozzle with its output circumferentially located the edges of the noise-canceling triangular teeth, while the ends of the adjacent teeth are bent in opposite directions to the axis of the nozzle and to the wall of the mixing chamber, characterized in that, in order to reduce the level noise, increasing efficiency and reliability, the ends of the teeth bent to the nozzle axis are bonded to each other at a common point located to the nozzle axis at a distance from the nozzle section (1.0-1.5) den, where den is the internal the diameter of the nozzle and have an arcuate profile, while the centers of the arcs are located on the side facing the axis of the nozzle, while the other teeth are flat and bent from the axis of the nozzle at an angle of 8-10 °.