RU2666683C2 - Cast ejector - Google Patents

Abstract

FIELD: transportation.SUBSTANCE: plane-slit ejector is designed to move fluids by ejection. Ejector consists of several tubes having two flat slits each, the tubes being parallel to each other on one level so that their nose portions are in one direction, the ends of the pipes are connected by pipelines for transport from the supercharger to the pipes of the ejecting fluid, a symmetrical crescent, the straight edges of each fairing and the nose of each tube constitute two flat slits whose channels, in cross section, are tapering nozzles, cavity between the fairing and the nose of the pipe is a receiver, a vessel for equalizing the pressure fluctuations, which communicates with the internal cavity of the pipes through the holes in the nose of the pipes.EFFECT: lower ejector weight.1 cl, 6 dwg

Description

The “Flat-gap ejector” device (hereinafter referred to as the PShE) belongs to the engineering sector. Designed to move fluids.

From the prior art, an ejector is known by copyright certificate WO 2009054732 A1 04/30/2009

The invention relates to an ejector for liquids, of which these liquids can be gas or liquid. The invention relates to an ejector in which primary air passes and is blown through the slot, and in which air deviates along the guide wall in accordance with the so-called Coanda effect, the guide wall being flush with the exit, so that the primary air accelerates the secondary air along the secondary air chamber and creates a reduced pressure in the secondary fluid chamber, which may be provided with a vacuum suction surface. The invention can be applied, inter alia, as a vacuum gripping device for brittle or porous devices such as paper, textile, leather, fish and meat fillets and other devices having low weight, high porosity and low bending stiffness.

In this invention, the inlet for secondary (ejected) air and therefore the suction action occurs along the normal to the z axis (i.e. perpendicularly) to the plane of the drawing and in which the inlet of the primary (initializing) pressure air is on the left side drawing. The outlet for primary air and secondary air (mixed flow) is directed to the right side of the drawing through the outlet channel. Primary air is pumped in the direction of exit from the chamber of the secondary fluid unilaterally and to the side relative to the direction of the outlet channel.

The disadvantages of the ejector by copyright certificate WO 2009054732 (A1) are:

- the complexity of manufacturing internal channels designed to move the primary (initializing) air, the output channel;

- not intended for use as an element of blower installations, for example for direct-flow ventilation, adapted for installation in an aperture;

- the volume of the secondary (ejected) fluid is limited by the diameter of the inlet made in the device body along the normal to the z axis (i.e., perpendicular to the primary air and outlet channels).

From the prior art, an ejector is known by copyright certificate SU No. 432296 (VNIIBTGRP) 06/15/1974,

containing a rectangular housing, inside of which in the center is an ejection element in the form of a tubular rectilinear collector with a series of one-sided nozzle openings. When compressed air is fed into the tubular manifold and further into the nozzle openings around them, a vacuum is created around which a large amount of ambient air is ejected into the ejector body. To change the direction of movement of the ejected air, it is enough to rotate the collector 180 degrees.

The disadvantages of the ejector according to copyright certificate No. 432296 are:

- inefficient use of energy of compressed air, because the interaction of the initiating and ejected air is carried out only on the surface of the cone formed by the boundary of the high-pressure outlet from the nozzle holes in the side wall of the tubular manifold and low-pressure air;

- the walls of the rectangular casing, fixed only on the side of the ends of the tubular rectilinear collector, are subject to vibrational stress caused by turbulence at the shock waves of the supersonic flow seal, which significantly reduces the service life of these walls.

From the prior art, the injector injector Coanda is known according to the copyright certificate GB 1512785 A (BRAUER F LTD) 06/01/1978

This injector is a linear cone-forming (in cross section) nozzle obtained by extrusion, for example, a light alloy for forming a hollow body, and a fixed cap, which can also be extruded. One or more openings in the wall of the hollow body leading to the inside of the body serve to supply an ejective fluid. The outer part of the wall of the hollow body adjacent to the linear nozzle is a Coanda surface.

The disadvantages of the injector according to the copyright certificate GB 1512785 A are:

- the outer part of the hollow body is made non-streamlined in shape, having a large frontal and bottom aerodynamic drag, which will lead to losses of kinetic energy of the mixed stream exiting the ejector;

- only one linear nozzle is provided in the injector, which makes the use of the energy of the initiating fluid less efficient;

- the influence of the longitudinal component of the velocity vector of the initiating stream flowing inside the hollow body on the stream exiting from the subsonic nozzle;

- the initiating flow leaves the linear nozzle at the beginning of the Coanda surface at an angle close to the perpendicular to this surface so that only a small part of the flow enveloping this surface is most effectively involved in creating a vacuum above it.

From the prior art, an ejector device according to copyright certificate SU No. 1613639 A1 (IGD AN KAZSSR) is known on December 15, 1990, which is closely related to the claimed invention and taken as a prototype containing 2 ejection modules, each of which has a distribution chamber in the form of a straight or a curved pipeline with a gap. The latter is located along the generatrix of the pipeline to the ends. A fairing is fixed along the slit tangentially to the side surface of the chamber. A flow part in the form of a plate, flat or curved in the longitudinal direction of the plate, is connected to the cowling tangentially to its lateral surface ... The modules are installed with the possibility of rotation and displacement of their flow parts ... At a pressure of up to 0.2 MPa, compressed air is supplied to both chambers, which ensures uniform outflow him out of the gap along its entire length. At high pressures, compressed air is supplied to one chamber, and a plug is placed on the nozzle of the second chamber. Compressed air, coming from the air distribution chambers to the ejection devices, flows out of its slots at a supersonic speed, enveloping the curved surfaces of the exit cowl and laying on the flowing surfaces of the modules. Due to this, a high vacuum is created on them and air is sucked in, which is drawn into the flows moving along the surfaces of the device ... Two ejection modules are exposed by flowing surfaces to the outside ... After that, the flowing surfaces are set exactly, in the right position, symmetrically or with an offset ...

The disadvantages of the ejector according to copyright certificate No. 1613639 are:

- a high probability of flutter of the flowing surface at a supersonic velocity of the outflow of compressed air through the slit of the pipeline, due to the mismatch of the center of stiffness with the center of pressure of the flowing surface made in the form of a flat or curvilinear in the longitudinal direction of the plate, which is fastened only from the fairing side;

- a predisposition of the device design to permanent deformation when exposed to lateral load, because the distribution chamber in the form of a pipeline has a gap located along the generatrix of the pipeline from end to end, which reduces, compared with a pipeline without a gap or holes, the structural strength;

- low energy efficiency of compressed air flowing out at a supersonic speed from the slots of the ejection device due to the negative effect of the shock waves and due to the longitudinal component of the flow velocity vector flowing inside the distribution chamber on the initiating stream leaving the slot.

From the prior art, an ejector is known according to copyright certificate SU No. 123279 (Vasiliev Yu.N.) 01.01.1959, class. F04F 5/30, which is closely related to the claimed invention and taken as a prototype.

In the description of this invention means:

- “The main reason for the impossibility of obtaining at the stage of a conventional ejector very high degrees of compression and improved efficiency lies in the fact that with an increase in the pressure drop, the losses associated with the inhibition of the supersonic flow of the gas mixture in the ejector diffuser sharply increase, as well as the loss of gas mixing. The proposed scheme of the ejector stage with a curved axis allows you to improve the parameters of the ejector ...

The subject of the invention according to copyright certificate No. 123279:

- A gas or steam ejector with a curved axis, structurally made in a flat or axisymmetric design, characterized in that, in order to further reduce the static pressure at the jets boundary at the initial section of the mixing chamber, the axis of the high-pressure and low-pressure nozzles, as well as the wall of the initial section of the mixing chamber twisted. ... In order to reduce losses due to gas mixing and in shock waves that convert a supersonic gas mixture flow into a subsonic one, by correspondingly bending the channels, significant static pressure gradients are created along the channel width so that the expansion of the high-pressure gas required for ejection occurs only in a small region adjacent to the low-pressure gas nozzle ... The ejector stage with a curved axis consists of a high-pressure gas nozzle, a low-pressure gas nozzle, a mixing chamber and a diffuser. The axis of the nozzle exit sections and the walls of the initial section of the mixing chamber are curved, and low-pressure gas is supplied (from the internal cavity of the axisymmetric ejector body SU No. 123279 of Fig. 2, perpendicular to the direction of the mixed flow emerging from the ejector) at the convex wall of the mixing chamber. A gas or steam ejector with a curved axis can be made in an axisymmetric design. "

From the description of the ejector and figures attached to the certificate of authorship No. 123279, it follows that it is designed for high compression ratios when using a supersonic gas mixture flow, since each nozzle of a high-pressure gas with a curved axis of the channels is depicted by a narrowing-expanding supersonic “Laval nozzle”. The flow mixing chamber and the diffuser are structurally composed of an internal convex wall adjacent to the low-pressure gas nozzle and an external wall adjacent to the high-pressure gas nozzle (SU No. 123279 Fig. 1, 2.). These walls are integral parts of this ejector.

The disadvantages of the ejector according to copyright certificate No. 123279 are:

- increased vibrations, due to the mismatch of the center of stiffness with the center of pressure, the wall adjacent to the nozzle of the high-pressure gas, caused by turbulence of the flow at supersonic shock waves, which requires hardening of the ejector due to the thickening of the structural elements, which entails an increase in the weight of the device, or through the use of high-strength materials, which leads to a rise in the cost of production of the ejector;

- the difficulty of manufacturing a Laval nozzle with a curved axis of the high-pressure gas channel;

- not intended for use as an element of blower installations, for example for direct-flow ventilation, adapted for installation in an aperture;

- weighting of the ejector structure due to the need to use, in addition to the convex wall of the mixing chamber, an external wall, which is an integral part of the high-pressure gas nozzle, mixing chamber, and diffuser.

The tasks to be solved by the claimed invention PSChE is directed:

- to facilitate, simplify and cheapen the design of the ejector, while ensuring optimal strength, made with flat nozzles for high-pressure flow;

- reduce the negative impact of the longitudinal component of the velocity vector of the initiating stream flowing inside the pipes on the direction of the stream exiting from the flat tapering nozzle;

- provide direct-flow (i.e., the velocity vectors of the ejected, initiating and mixed flows have one direction) the movement of fluids through the openings of a wide range of their areas, subject to safety conditions, ease of transportation, installation and operation.

PShche device.

The problem is solved due to the fact that the PLANE GAS EJECTOR device (hereinafter referred to as the PSHE), designed to move fluids by ejection, consists of several Pipes (hereinafter T) each of which has at least two flat slits, characterized by that T are located parallel to each other so that their noses are in the same direction and on the same plane, the ends of T are connected by pipelines intended for transportation from the supercharger to T of the ejection fluid, in front of the nose Each pipe has a Symmetric, Crescent, Cross-sectional Fairing (hereinafter CCO), the straight edges of each CCO and the nose of each T comprise two flat slits, the channels of which, in cross section, are tapering passages, the cavity between the CCO and the nose of T is a receiver (a vessel for equalizing pressure fluctuations), which communicates with the internal cavity T through openings in its nose.

The proposed flat-slot ejector works as follows.

The ejector consists of several parallel pipes. Their inner diameter is directly proportional to the required flow rate of the initiating fluid through the flat tapering nozzles. The flow rate depends on the length of the pipe, its hydraulic resistance, and the overpressure of the initiating fluid. There are round holes in the nose of each Tube. The diameter and number of holes are selected taking into account the permissible structural strength and the required values of the flow rate and the volume of the initiating fluid emerging from the flat tapering nozzles. So with an increase in the number and diameter of these holes, the flow rate of the initiating fluid flow coming out from each flat tapering nozzle will increase.

Through both ends of each Pipe, to reduce hydraulic resistance, inside the Pipes through pipelines connecting the ends of these Pipes, an initiating fluid is supplied under excessive pressure. The magnitude of the overpressure of the initiating fluid is determined, inter alia, by the required velocity of the initiating flow exiting the planar narrowing nozzles.

Then, through round holes in the nose of the Tube, it enters an expanding cavity - the receiver. The walls of the receiver are the nose of the Pipe and the inner part of the wall of the Symmetric, Crescent, in cross section, Fairing (MTR).

The receiver serves to reduce the influence of the longitudinal component of the velocity vector of the initiating flow flowing inside the Pipes on the flow exiting from the flat tapering nozzle by reducing the kinetic energy of the subsonic flow. This leads to equalization of pressure and velocity fluctuations in front of the flat tapering nozzles along the entire length of the receiver. In this case, the velocity vector of the initiating flow emerging from the flat tapering nozzle will be in the plane of the pipe cross section, which is necessary to create, with other equal initial flow parameters, the maximum discharge in the ejector channel.

From the receiver, the initiating fluid passes through two symmetrical planar tapering nozzles. They are formed by the outer part of the pipe wall and the inner part of the CCO wall.

The outer parts of two adjacent MTRs form a tapering low-pressure nozzle (inlet confuser). The external surface of the streamlined SSO is used to form a low-turbulent ejected fluid in the confuser, which is sucked into the ejector from the space in front of the SSO due to the high-pressure, high-speed, flow of initiating fluid generated in the ejector of the discharge formed by the tapering nozzles coming out of the plane narrowing nozzles.

Accelerated in a flat tapering nozzle, the initiating fluid, in accordance with Coend's law, bends around the outer surface of the Pipe. This will lead, due to Bernoulli's law for stationary flow, to create a vacuum over the convex surface of the outer part of the pipe wall. The middle parts of the outer side walls of two adjacent parallel pipes form a narrowing-expanding mixing chamber. In the mixing chamber, the ejected flow is accelerated by the energy of a high-speed, high-pressure, initiating flow emerging from flat tapering nozzles. The mixed flow rate can be adjusted by changing the distance between the walls of the mixing chambers, as well as by changing the pressure in the receiver.

Thus, each flow part of the PShE consists of:

- input confuser formed by the external parts of two neighboring MTR;

- a narrowing-expanding mixing chamber formed by the middle external parts of the side walls of two adjacent parallel pipes;

- a diffuser formed by the rear external parts of the walls of two adjacent parallel pipes.

Examples of embodiments of the invention showing the possibility of obtaining a technical result for all combinations of characteristics of the features.

- PSChE can consist of more than two Pipes.

- The dimensions of the linear channels of the PShE are calculated from the conditions of the required flow rate of the mixed ejected stream and its design speed, taking into account the excess pressure of the initiating fluid entering the PShE.

The technical result provided by the given set of features is that the claimed device, an ejector with flat nozzles - ПЧЭ, is lighter than its predecessors due to the multifunctional use of its construction elements, is simpler and cheaper to manufacture than previously known ejectors, taken as a prototype SU No. 123279 and SU No. 1613639 A1, because the main detail of the PShche - the pipe is most rationally used:

- for transporting the initiating stream through its internal cavity;

- as walls: flat tapering nozzles; confuser; mixing chambers with Coend's surface; diffuser;

- as a power beam that prevents sagging of the PShE elements, when the PShE is horizontal (since the tube section having the smallest area for a given load on the beam is recognized as the most rational for the beam), with round holes in the nose of the pipe, unlike longitudinal slotted elements (used in the prototypes) in the walls of pipelines, less than slotted holes weaken the bearing capacity of the pipes.

PShE provides:

- direct-flow (i.e., the velocity vectors of the ejected, initiating and mixed flows have one direction) the movement of fluids through the ejectors in a wide range of their areas, because the ejector is easily scaled by setting both the required number of pipes and the length of the pipes;

- less negative impact of the longitudinal component of the velocity vector of the initiating stream flowing inside the pipes on the direction of the stream exiting from the subsonic nozzle, due to the applied receiver that provides pressure equalization and a decrease in the speed of the initiating stream in front of the flat tapering nozzles;

- ease of transportation and installation, as in disassembled form, ПЩЭ consists of straight pipes and a fairing made of the longitudinal part of a straight pipe.

The differences of the claimed invention PSChE from the previously known prior art taken as a prototype SU No. 1613639 A1 and SU No. 123279 A are the following elements:

- a fairing (MTR) is installed in front of the nose of each pipe (T) so that the outer parts of two adjacent MTRs form a tapering low-pressure nozzle (inlet confuser), and the outer (convex) surface of the MTR is streamlined in aerodynamic form to form a low-turbulent flow of ejected fluid in the confuser environment;

In the invention SU No. 1613639 A1 (Fig. 1, 2, 3, 4, position 6), the fairing is an element of the internal part of the cavity of the pipeline transporting the initiating flow and an element of the initial section of the flowing surface in the form of a plate. Therefore, it cannot be a cavity for the receiver and part of the confuser, forming a low-turbulent flow of ejected fluid.

In the invention SU No. 123279 A (Fig. 2), the fairing with its external (convex) part forms the curved channels of two nozzles of the high-pressure (initiating) stream, and with its internal (concave) part and the axisymmetric body, it forms the channels of two nozzles of the low-pressure (ejected) stream. The fairing is a common wall separating the curved channels of high-pressure and low-pressure flows. The axes of these channels are parallel.

- there is a receiver, which is a cavity between the MTR and the nose of the pipe, in which the pressure fluctuations and the velocity of the initiating fluid are equalized. This medium enters the receiver from the interior of the pipe through round holes. The initiating fluid emerges from the receiver at the same, in all cross sections, speed through two symmetric, narrowing nozzles along two symmetric (symmetry axes of the pipe and CCO cross sections, on the same line);

Based on the description (SU No. 123279 A, p. 2) and the drawing (SU No. 123279 A, Fig. 2 on page 3), the internal cavity of the axisymmetric casing serves as a highway for transporting low-pressure (ejected) gas and a receiver for low-pressure gas ( A receiver is a vessel for accumulating gas or steam entering it and consumed through pipes of a smaller cross section, as well as for smoothing out pressure fluctuations caused by a pulsating flow and intermittent flow. TSB.);

- to maximize the use of the pipe’s strength characteristics in the PShE, round holes in the pipe nose are used as channels for the passage of fluid from the internal cavity of the ejector to tapering flat nozzles, rather than flat slots in the pipeline body as in SU No. 123279 A, FIG. 2;

- in contrast to the invention SU No. 123279 A of FIG. 2 in the PShE, the ejected fluid is sucked into the ejector from the space in front of the MFR (and not from the inner tubular cavity perpendicular to the direction of the mixed stream exiting the ejector) and, accelerating in the confuser, in the mixing chamber and in the diffuser, moves along the linear channel of the ejector, and the initiating flow coming out of the pipe cavity through the receiver into flat tapering nozzles (and not through curved tapering-expanding supersonic Laval nozzles, SU No. 123279 A of Fig. 1, 2, 3), moves along the envelope along the convex side wall of the pipe would be “Coend’s surface” (and not along the wall which is opposite to the convex wall - “Coend’s surface”, SU No. 123279 A of Fig. 1, 2).

- linear channels of PShCH are formed by two adjacent T with MTR;

- in contrast to the invention SU No. 1613639 A1, in the PShCH along each pipe there are two flat tapering nozzles that bring the initiating flow to two opposite sides of the pipe, thereby increasing the flow rate of the ejector with the same dimensions;

- in contrast to the invention SU No. 1613639 A1 in the PShCH, the outer parts of the pipe walls are used as Coend surfaces, rather than a curved plate fixed from the fairing side;

Positive aspects of the PSChE.

The supercharger can be placed at a safe distance from the ejection zone in a convenient place for maintenance.

PShE does not have moving parts and electrical contacts, which can be sources of injury, therefore there are no frequently serviced parts.

The possibility of using less than in the prior art, the pressure of the ejection medium with a similar throughput due to the increased total area of the ejector by increasing the number of pipes.

The production of PSChE is possible from various materials, for example, from pipes made of easily connected materials (plastics, metal plastics, thin-walled metal, and the like). It is also possible to create an easily removable PShE from straight pipes, the installation of which is possible without special preparation. Unassembled PSE from straight pipes does not require special transportation conditions, as The disassembled ejector consists of straight pipes and parts of straight pipes.

It is possible to use, in conjunction with the PShche, injection units of various types (centrifugal, axial, fan, piston, etc.), which allows the PShCH to be a universal device.

The absence of rubbing parts in the PShE allows to increase the period of fault tolerance and the operating time of the device to Maintenance.

No need for expensive repairs and maintenance.

The relatively low cost of the PSE due to the simplicity of manufacture and the availability of component materials.

The invention is illustrated by drawings, which are illustrative materials of a particular case of the implementation of the PSHE.

In FIG. 1 is an isometric view of the PSChE;

In FIG. 2 is a top view of the PSChE;

In FIG. 3 - view of one element PShche - Pipe with MTR;

In FIG. 4 is a sectional view A-A of FIG. 2 elements of PSChE;

In FIG. 5 is an enlarged view B of FIG. 4 parts of PShche;

In FIG. 6 is a cross-sectional view of the PShche, option with two Pipes;

The device and principle of operation of the PShche.

A FLAT-MOUNTED EJECTOR (hereinafter referred to as the PDE), designed to move fluids, consists of several (Fig. 1, 2) parallel Pipes (1) (Fig. 1, 2, 3, 4, 5, 6). Their inner diameter (2) (Fig. 4) is directly proportional to the required flow rate of the initiating fluid (3) (Fig. 5, 6) through the flat tapering nozzle (4) (Fig. 3, 4, 5). The flow, in turn, depends on the length (5) (Fig. 3) of the pipe, its hydraulic resistance, and on the overpressure of the initiating fluid (3) (Figs. 5, 6). In the bow (9) (Fig. 6) of each pipe there are round holes (6) (Figs. 3, 4, 5, 6). The diameter and number of holes (6) (Fig. 3, 4, 5, 6) is chosen taking into account the permissible structural strength and the required values of the velocity and volume of the initiating fluid (3) (Fig. 1, 2, 5, 6) coming out of flat tapering nozzles (4) (Fig. 3, 4, 5). Through both ends (7) (Fig. 3), to reduce hydraulic resistance, into the internal cavity (25) (Figs. 3, 4) of each Pipe (1) (Figs. 1, 2, 3, 4, 5, 6) through pipelines (8) (Fig. 1, 2) connecting the ends (7) (Fig. 3) of these Pipes, initiating fluid (3) is supplied under excess pressure (Figs. 1, 2, 5, 6). Then through the round holes (6) (Fig. 3, 4, 5, 6) in the bow (9) (Fig. 6) of each T (1) (Fig. 1, 2, 3, 4, 5, 6) it gets into the expanding cavity - the receiver (10) (Fig. 4, 6). The walls of the receiver are the nose of the pipe (9) (Fig. 6) and the inner part of the wall of the Symmetric, Crescent, in cross section, Fairing (hereinafter CCO) (11) (Fig. 4, 6).

The receiver (10) (Fig. 4, 6) serves to reduce the influence of the longitudinal component of the flow velocity vector of the initiating fluid (3) (Fig. 1, 2, 5, 6) flowing inside the Pipes (1) (Fig. 1, 2 , 3, 4, 5, 6), into the flow of initiating fluid (3) (exiting from the flat tapering nozzle (4) (Fig. 3, 4, 5) (Figs. 1, 2, 5, 6). This is due to the fact that when the subsonic stream expands in the receiver, its kinetic energy decreases. From the receiver (10) (Fig. 4, 6), the initiating fluid passes through two symmetric flat tapering nozzles (4) (Fig. 4, 6) (the axis of symmetry of the cross sections of each Pipe and CCO lie on the same line (12) (Fig. . 6)). Flat tapering nozzles (4) (Figs. 4, 5, 6) are formed by part of the outer front wall of the pipe (13) (Fig. 5) and part of the inner wall of the CCO (14) (Fig. 5).

The outer parts (15) (Fig. 6) of two adjacent MTRs form a tapering low-pressure nozzle (inlet confuser) (19) (Fig. 6). The external surface of the CCO (18) (Fig. 6) of a streamlined shape serves to form a low-turbulent ejected (22) (Fig. 6) fluid in the confuser, which is sucked into the ejector from the space in front of the CCO due to the vacuum created in the ejector.

Accelerated in a flat tapering nozzle (4) (Fig. 4, 6), the initiating fluid (3) (Fig. 1, 2, 5, 6), in accordance with Coend’s law, bends around the outer surface of the pipe (16, 17) ( Fig. 6). This will lead, due to Bernoulli's law for stationary flow, to create a vacuum over the convex surface of the outer part of the wall (16) (Fig. 6) of the Pipe. The middle parts of the outer side walls (16) (Fig. 6) of two adjacent parallel Pipes (1) (Figs. 1, 2, 3, 4, 5, 6) form a narrowing-expanding mixing chamber (20) (Fig. 6). In the mixing chamber, the ejected flow (22) (Fig. 6) is accelerated due to the energy of a high-speed, high-pressure, initiating flow (3) (Figs. 1, 2, 5, 6) emerging from the flat tapering nozzles (4) (Fig. 4) , 6), and due to the narrowing of the mixing chamber (Bernoulli law). The flow rate of the mixed stream (23) (Fig. 6) can be adjusted, including by changing the dimensions of the linear channels (24) (Fig. 2) between the walls of the mixing chambers.

The rear outer parts of the walls (17) (Fig. 6) of two adjacent Pipes (1) are the walls of the ejector diffuser (21) (Fig. 6).

Examples of embodiments of the invention:

- PSE may consist of more than two Pipes (Fig. 1, 2).

- The dimensions of the linear channels (24) (Fig. 2) are calculated from the conditions of the required flow rate of the mixed stream (23) (Fig. 6) and its design speed, taking into account the excess pressure of the initiating fluid (3) (Figs. 1, 2, 5 , 6) entering the PShE.

Claims (1)

A flat slot ejector designed to move fluids by ejection, consisting of several pipes having two flat slits each, characterized in that the pipes are parallel to each other at the same level so that their nose parts are in the same direction, the ends of the pipes are connected by pipelines for transportation from the blower to the pipes of the ejection fluid, in front of the nose of each pipe there is a symmetrical, sickle-shaped, cross-sectional cowl, straight edges of each cowl and oic portion each comprise two flat tube slit channels which in cross section are tapered nozzle cavity between the radome and the nose portion of the tube is a receiver - a vessel for equalizing pressure fluctuations, which communicates with the interior of the pipe through openings in the bow tubes.

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