RU1806296C - Gas ejector - Google Patents

Abstract

Usage: in inkjet technology. SUMMARY OF THE INVENTION: the leading edges of the blades of a coaxially mounted helical blade insert are stepped. The leading edges of the blades of smaller diameter are located inside the active nozzle / larger diameter - outside the nozzle and intersect the outlet edge of the nozzle. The inner edges of the blades are located on the axis of the ejector. The leading and trailing edges of the larger diameter are of variable radius, increasing from the nozzle. Each larger stage vane has at least one section starting from a radius equal to or greater than the radius of the nozzle exit section. The cuts are made in the direction from the axis of the ejector to the wall of the mixing chamber. The radius of each point of the cut line increases simultaneously with its distance from the exit section of the nozzle. The portions of the blades behind each cut are smoothly bent in the swirl direction along the line passing through the beginning of the cuts. Each point of the bend line is equidistant from the axis of the ejector. 1 s.p. f-ly, 3 ill.

Description

The invention relates to inkjet technology and can be used in pumping various media.

The purpose of the invention is to increase efficiency and reduce size.

In FIG. 1 is a longitudinal section through an ejector; in FIG. 2 is a section AA in FIG. TJ (if- angle of rotation of the blade); in FIG. 3 - fragment: blade and nozzle.

In a gas ejector containing an active nozzle 1, a mixing chamber 2 with a diffuser 3, a coaxially mounted screw blade insert 4, the front edges of the 5 blades of which are made stepwise, while the front edges of the blades of a smaller diameter 6 are located inside the active nozzle 1, and a larger diameter 7 outside the nozzle 1 and cross the exit edge

nozzle 1, the inner edges of the 8 blades are located on the axis of the ejector, the front 5 and rear 9 edges of the blades of a larger diameter 7 are made of variable radius, increasing from the nozzle 1.

In this case, each blade of the step of larger diameter 7 can have at least one cut 10 (Figs. 1, 2, 3), starting with a radius R equal to or greater than the radius r of the outlet section of the nozzle 1 (Fig. 3), the cuts are made in the direction from the axis of the ejector to the wall of the mixing chamber 2, the radius of each point of the cut line 10 increases simultaneously with its removal from the exit section of the nozzle 1, and the sections of the blades behind each of the cuts are smoothly bent in the direction of swirl along line 11 passing through the beginning of the cut (Fig. 3)

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moreover, each point of the bending line is equidistant from the axis of the ejector.

Gas ejector works as follows.

At the exit from the nozzle 1, the peripheral layers of the active medium due to the acting centrifugal forces arising from the twisting of the specified medium in a screw blade insert 4, located partially in the nozzle 1 itself, move along the concave surface of each blade 7 simultaneously. along the axis of the ejector and in the direction from the axis of the latter to the chamber wall. of the mixture 2 (Fig. 3), while interacting outside the cylindrical surface described by the radius r of the outlet section of the nozzle 1 with a passive medium.

Due to the fact that the particles of the active medium outside the specified cylindrical surface of radius r move towards the diffuser along a curved path, the surface area of each blade of pain-1 of that diameter 7 is reduced by making the front 5 and rear 9 edges of the blades of large diameter 7 of variable radius increasing from nozzle 1, which leads to a decrease in resistance to movement of passive and active media. This eliminates premature swirling of the passive medium, i.e. prior to the interaction with the active medium, the twisting of the active medium near the axis of the ejector at the outlet of the insert, which in the indicated zone does not contribute to improving the quality of interaction of the two media, but creates additional resistance to the movement of the medium and the energy consumption for twisting it, is also eliminated.

Due to the presence of at least one cut 10 (Fig. 1) of each blade of the step of larger diameter 7 and smooth bending of the sections of the blades 7 behind each of the cuts in the swirl direction, it is possible to improve the quality of mixing of the two media due to the active medium moving as the insert to the diffuser is distributed over the cut parts of the specified blade 7, increasing the interaction zones of the two media, thereby increasing the efficiency, and making cuts so that the radius of each point of the cut line increases simultaneously with the impact leniem it from the output section of the nozzle, resulting in a further increase efficiency by reducing the hydraulic resistance to movement of the media,

The choice of the geometry of the screw blade insert and its size depends on the characteristics of the ejector in the nominal (design) mode of its operation and they are chosen as

so that the maximum possible ejector efficiency is achieved.

The use of the claimed invention in condensing units of steam turbines, as well as in other industries

allows to reduce energy costs for servicing them by increasing the efficiency of the ejector by intensifying the process of mixing active and passive media in the mixing chamber, as well as to reduce the size

the latter without significantly complicating the design.

Claims (2)

1. A gas ejector containing an active nozzle, a mixing chamber with a diffuser, coaxially mounted screw blade insert, the leading edges of the blades of which are made stepwise, while the leading edges of the blades of a smaller diameter are located inside the active nozzle, and of a larger diameter — outside the nozzle and intersect the outlet edge of the nozzle, the inner edges of the blades are located on the axis of the ejector, characterized in that the front and rear edges of the blades of a larger diameter are made of a variable radius increasing by the nozzle. 2. The ejector according to claim 1, characterized in that each blade of a larger diameter step has at least one cut beginning with a radius equal to or greater than the radius of the nozzle exit section, the cuts are made in the direction from the axis of the ejector to the wall of the mixing chamber, the radius of each the points of the cut line increases simultaneously with its removal from the exit section of the nozzle, and the portions of the blades behind each of the cuts are smoothly bent in the direction of swirl along the line passing through the beginning of the cut each point of the bending lines is equidistant from the axis of the ejector. Order 971Mintage Subscription VNIIIPI of the State Committee for Inventions and Discover at the USSR State Committee for Science and Technology 113035, Moscow, Zh-35, Rauska nab., 4/5