RU1806300C - Gas ejector - Google Patents

Abstract

Usage: in inkjet technology. . SUMMARY OF THE INVENTION: The slotted exit openings of a multi-barrel active saline are formed by partitions, the leading edges of which are of a smaller diameter are located inside the nozzle, the larger in the mixing chamber 2. The back face of each partition is located in the mixing chamber. The peripheral face of the baffle outside the nozzle is located outside the cylindrical surface described by the radius of the exit section of the nozzle. The leading edges of the partitions are stepped, directed from the axis of the ejector, with the formation of a sharp edge. The larger steps are streamlined: The thickness of the partitions increases in two directions, towards the diffuser and from the axis of the ejector. The leading edge is either straight or arcuate. The lateral edge of the septum is made flat, the edges of the rear - arc. 7 c.p. 5 l,

Description

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

The purpose of the invention is to increase efficiency.

Ejectors are not known in which the front edges of the partitions would be stepped, directed from the axis of the ejector, with the formation of a sharp edge, steps of a larger diameter would be streamlined, and the thickness of each partition would increase in two directions - to the diffuser and from axis of the ejector.

In FIG. 1 shows a longitudinal section of the proposed ejector; in FIG. 2-5 is a section A-A in FIG. 1.

In a gas ejector (Fig. 1, 2) containing a mixing chamber 1 with a diffuser 2 and a multi-barrel active nozzle 3 with slotted outlet openings 4 formed by partitions 5, the leading edges 6 of which are of a smaller diameter inside the nozzle 3, and the larger - in the chamber mix 1 and the rear face 7 of each partition is located in the mixing chamber 1, and the peripheral face 8 of each partition 5 outside the co-plane 3 is located outside the cylindrical surface described by the radius r of the outlet section of the nozzle 3, the front edges. 6 partitions 5 are stepped, directed from the axis of the ejector, with the formation of a sharp edge, steps of a larger diameter are streamlined, and the thickness of each partition 5 increases in two directions - to the diffuser 2 and from the axis of the ejector.

In this case, the leading edge 6 of each partition may be straight (Fig. 2) or may have the shape of an arc (Fig. 3); one side face 9 of the partition 5 may

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be made flat (Fig. 4); both edges 10 and 11 of the rear edge 7 (Fig. 3) of the partition 5 can be made arc; each leading edge 6 of the partition 5 and both edges 10 and 11 of each rear edge 7 thereof can be rotated at an angle relative to each other around the axis of the ejector (Fig. 3, without rotation); inner faces 12 of each partition 5 can be interconnected (Fig. 1); a gap can be made between each inner face 12 of the partition 5 and the inner faces 12 of the other partitions 5 (Fig. 5).

Gas ejector (Fig. 1, 2) works as follows.

An active medium (steam or water) enters the multi-barrel active nozzle 3 with slotted outlet openings 4 from the receiving chamber, where the potential pressure energy of the latter is converted to the kinetic energy of the jet, which, due to the presence of nozzle 3, cross section 5 on a number of jets.

Behind the outlet cross section of the nozzle 3, the pressure of the active medium decreases to the pressure at the suction of the ejector, as a result of which an increase in the volume of the active medium takes place behind the nozzle 3. Therefore, the presence of septum 5 ,. partially located in the mixing chamber 1, with the expansion of the active medium in the direction from the axis of the ejector, it is possible to create conditions for the formation of voids behind the rear faces 7 of each partition 5 into which the passive medium is drawn, and the interaction surface of the two media increases sharply, which leads to achieving high values of efficiency of the ejector.

The length I of the portion of the septum located in the mixing chamber 1 (Fig. 1) is determined experimentally when maximum efficiency is reached at the nominal operating mode of the ejector and must be such that the process of expansion of the active medium is completed before the latter approaches the rear edge 7 of the septum 5. In this case, the peripheral face 8 of each partition 5 in the radial direction should be located at such a distance from the axis of the ejector that the active medium at the exit from the nozzle 3 does not close the indicated faces 8, thereby ensuring free access passive medium into the resulting voids behind the rear faces of 7 each, baffle 5.

The implementation of the straight leading edge 6 of each partition 5 is advisable for small values of the output radius r of the nozzle 3, and an arc shape for large radii of the output section of the nozzle 3, while both edges 10 and 11 of the rear face 7 can be

made by arc, which provides an increase in the surface of interaction of two media in the mixing chamber 1 and leads to an increase in the efficiency of the ejector. Rotate each

the leading edge 6 of the partition 5 and both edges 10 and 11 of each rear face 7 at an angle relative to each other around the axis of the ejector provides a swirl of the flow, which leads to an additional increase in efficiency. Depending on the performance of the ejector, and accordingly the radius of the output section of the nozzle 3, the inner faces 12 of each partition 5 can be interconnected (Fig. 1)

5 or between each inner face 12 of the partition 5 and the inner faces 12 of the other partitions 5, a gap can be made (Fig. 5), and the efficiency of the ejector must be high.

0 To ensure reliable operation of the ejector, the partitions 5 can be made not rigidly connected to the nozzle 3, which, using a special device, allows the partitions 5 to be removed from the nozzle 3 for

5 cleaning them from possible pollution.

The use of the claimed invention in condensing units of steam turbines, as well as in other branches of technology, makes it possible to reduce the energy consumption for the operation of the ejector due to a significant increase in efficiency, as well as to reduce weight and dimensions and increase its reliability.

Claims (8)

The claims 5 1. A gas ejector containing a mixing chamber with a diffuser and a multi-barrel active nozzle with slotted outlet openings formed by partitions, the front edges of which are smaller in diameter and inside the nozzle and the larger in the mixing chamber, and the back face of each partition is located in a mixing chamber, the peripheral face of each partition outside the nozzle 5 located outside the cylindrical surface described by the radius of the outlet section of the nozzle, characterized in that the front edges of the partitions are made tupenchatymi directed away from the axis 0 of the ejector, with the formation of a sharp edge, the steps of a larger diameter are streamlined, and the thickness of each partition increases in two directions - to the diffuser and from the axis of the ejector. 5 2. An ejector according to claim 1, characterized in that the front edge of each partition is straight. 3. Ejector pop. 1, characterized in that the leading edge of each partition has an arc shape. 4. An ejector according to claim 1, characterized in that one side face of the partition is made flat. 5. An ejector according to claim 1, characterized in that both edges of the rear edge of the septum are arched. 6. The ejector according to claim 1, characterized in that each front edge of the septum and both edges of each rear face thereof rotated at an angle relative to each other around the axis of the ejector. 7. The ejector according to claim 1, characterized in that. that the inner faces of each partition are interconnected. 8. The ejector according to claim 1, characterized in that a gap is made between each inner face of the partition and the inner faces of the other partitions. FIG. 4 FIG. 5