US2004277A - Ejector - Google Patents

Description

June 11`, 1935.

Jmes dlp-72k l f` ATTORNEY. f

Patented June 11, 1935 urufrED STATES- fmirraNr aoFFic-E ,N f e d f `r `.2,004r1' r l i i i `Emerce, y f VJames Fink, Detroit, jzrigssiglfi-rn'.,tov Continental `Motors Corporation,"Detroit,"y ,Y a

corporation of Virginia Application september 12, `1932, serial No. staartV z claims. {ci} 1032-262) q This` invention relatesl to "ejectors land has among its objects the Vprovision `of an ejector ofincreasedefficiency,` lesser cost, and more Vcompact arrangement. i, k u

My invention relates particularly to thehigh efficiency types of ejectors wherein theprimary or driving fluid'is passed through a nozzle con-` struction so as to entrain ,the secondary or 1 driven iiuid, the latter passing inwardlyto-.the nozzle from the outside andv also from the inside of the annularprimary iiuid stream. Heretofore in ejectors of this general type, the fluid stream has been directed so as to move approximately at right angles on entraining the secondary fluid and the mixture has been collected in a circumferential chamber. Such construction is objectionable from the standpoint that considerable energy is lost by reason of the right angle bend which the fluid makes, giving rise to also objectionable from the standpoint that the annular collecting chamber takes up a relatively large amount of space, giving rise to difficult installation and providing for relatively high cost.

It is a further object of my invention to overcome the aforesaid objectionable characteristics by providing an ejector wherein the fluid stream passes substantially axially of the nozzle structure, 'the stream curving only slightly from a true axial path in order to accommodatel en- Vtraining the secondary fluid within the'annular primary fiuid stream. By reason of my construction the fluid stream passes generally axial- 40 arrangement of parts more particularly hereinafter described and claimed, referencebeing had to the accompanying drawing illustrating one embodiment of my invention, in which:

Fig. 1 is a sectional elevation View through the ejector, and

Fig. 2 is a sectional view along the line 2-2 of Fig. 1.

In the drawing, reference character A repre-Y sents the ejector nozzle having a primary anof the secondary fluid' inwardly to the nozzle as 55 hereinafter described.

inefficiencies, eddy losses and the like, and is ly of the ejector so as to avoid the aforesaid.

nular nozzle portion Il] and a secondary annular The primary nozzle portion IIJ is formed with asuitable inlet I3 for the primary Viiuid under pressure, this nozzle portion having a throat I4 adapted `to increase, the velocityl of the primary ud passing therethrough.v `Below Ithe throat I4A the` nozzle portion I0 is provided with an .expanding part "I5, adapted to expand the primary fluid and increase its velocity in the opening I2. YAssociated with the expanding part I5 is a nozzle projection IE located concentrically therewithin, this projection Vcausingthe primary fluid stream to form `a jet ofl iiud substantially in the form of an annulus between the nozzle projectionY I6 and the inner walls of the expanding nozzle part I5. I

The secondary nozzle portion II cooperates with portion I solas to receive the fluid stream therefrom, theportion II having a central tube or core Il, theV inner walls of which provide `a passage I8 for conducting the secondary fluid to the outlet I9. tween the nozzle .projection I6 and the upper end of core I1, the outlet I9 being associated within and adjacent to the outlet I2. The projection I6 may be formed with a stem` 20 extending axially within core Il and secured to the bottom Wall 2I thereof by a suitable fastener 22. If desired, for greater eicency, the passageV I8 may be nozzle vshaped as indicated at 23 in order to facilitatethe flow of the secondary uid to the outlet I9.

The outlet I9 is formed be- The outer wall of the core I' I is spaced within l the inner wall of nozzle portion II so as to proprimary and secondary fluids and this annular conduitis preferably provided with a throat 25 the efficiency of flow of the adapted to increase fluid mixture through the secondary nozzle portion II. Below the throat 25 the 'fluid flow `unites in the discharge conduit 2B and it will be noted that the fluid flow through 'the nozzle A is generally axial in its direction, the iiuid moving only slightly outwardlyand again inwardly around the core I1. `The nozzle passages are further formed with smooth walls without abrupt `changes in direction whereby to reduce eddylosses and increase the efficiency of fluid flow.

Surrounding nozzle A is a casing B having an inlet 2l for the secondary or driven fluid, the casing B having a chamber 28 around opening I2 so as to supply the secondary fluid through opening I2 for entrainment with the primary fluid discharged at high velocity and therefore with high suction eifect from the primary nozzle l portion IO'into the secondary portion II.

Casing B is formed with a uid outlet 29 communicating With the conduit 30 leading to passage I8 and by referring to Fig. 2 it will be noted that the conduit 30 extends across a relatively small part of the annular passage 24 of nozzle portion II. It will be noted from the foregoing that the nozzle portions ID and II are provided with registering substantially frusto-conical annular passages providing for fluid flow therethrough substantially axially of the nozzle.

My ejector is adapted for use with many uids, one of which may be termed a primary or driving luid and enters the nozzle through the inlet I3 and the other uid which may be termed the driven or secondary fluid is supplied to the nozzle through a suitable inlet Z'I whence the secondary fluid is directed to the primary liuid stream inwardly at'opening I2 and outwardly thereto by opening I 9. By reason of such arrangement I have provided an ejector of increased eflciency, there being a relatively great amount of working area between the primary and secondary fluids. Ihave also provided for eliminating the discharge from the primary nozzle portion at right angles as referred to hereinbefore. My invention is especially useful in connection with gases or liquids of any type desired to be subjected toI the pumping action of the ejector.

What I claim as my invention is:

l. In an ejector, a nozzle having cooperating primary and secondary portions, said nozzle having an inlet for a secondary fluid intermediate said nozzle portions, a casing about said secondary uid inlet forming a chamber for a secondary uid open to said inlet, a conduit spaced Within said secondary nozzle portion, said conduit communicating with said chamber and discharging secondary fluid to said nozzle adjacent said inlet, said Secondary nozzle portion having an annular passage around said conduit extending generally axially of said primary nozzle portion, a nozzle projection within the discharge end of said primary nozzle portion, said projection providing an annular passage within said primary nozzle portion, and a stem carrying said projection and extending within said conduit.

2. In an ejector, a nozzle having cooperating spaced primary and secondary portions each having a frusto-conical annular iluid accelerating passage, said passage being in communication to provide substantially continuous axial flow of a primary fluid through said nozzle, a core within said secondary nozzle portion, means for supplying a secondary fluid laterally inwardly and outwardly to the space between said nozzle portions, and an axially disposed discharge conduit below said core merging outwardly thereabout with the truste-conical passage of said secondary nozzle portion.

JAMES O. FINK.

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