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Патент USA US2134460

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Oct. 25, 17938.
2,134,460 -
Filed Feb. 3, 1937
2 Sheets-Sheet 1
FIG: 7
¢ .
122 a’
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= Z’
2 i
% r 11H Hill-i111:
Oct. 25, 1938.‘
Filed Feb. 5, 1937
FIG .- 7
- FIG-5:5
2 Sheets-Sheet 2
Patented Oct. 25, 1938
2,134,460 ‘- .
f ' 12,134,460; ‘}
.' l '
Heifer-11, Tilci-lilaglualNetherlands
'11 fAp'plicationiili‘ebruaryl?, ‘1937, "senaiNo. 123,923 . < .
thehletlierlalndsliébruary 8,1936
(6.1-, ,7 230-95)
‘ .This invention 'relates'to a jetdeviceiinjec
corresponds or approximately corresponds to-the
tor or. ejector). in which» the :driven or. passive
. medium is forced into the path'of, the. driving
wall ‘1-12 is one of the edge or narrower side
or active medium, for thepurpose of transfer.
thickness of the-driving .jet, while‘, the curved
ring the kinetic, energ y of the latter to the great
- The other edge or narrow side wall It is par- 5
allelto thegendportion 'b‘ of‘the curvedwall
tie-by, and; thebroaddnlet-end 0-0! of thejet
chamber is ‘approximately parallel to the inlet
er massyof .the .resultingg?owi, : With the, highest ‘
possible ef?ciency. .
' Devices having this-same object are vlrnowrnin
end a of the curvedwall. The nozzle _s opens
into, the, jet chamber at the end, a of the curved 10
which the contents; of~a number of channels,
grouped arounda cylindrical rotor,_,ar,e periodi
wall Ct-sb, and .directsa jetof pressure medium
cally brought; in ,front of a drivingyjet nozzle. ‘1;
These devices allhave the disadvantage that. tangentially of the curved wall and substantial
the flow‘through a large? number oflnarrow chan-j ‘ 1y transversely'of theyaxis of the jet chamber,
nels causes a considerable loss vof.;energy bygfrice as indicated by the arrowin Fig. 1. It is to be
noted’that the driving jet is con?ned on only 15
,15 tion, and‘ the further disadvantageqthat it is threesidesgby the?curved wall and the adja- '
necessary. to. use either Jaw/very‘, highvxnurnber of
revolutions per. minu te 1 or ~ a rotor -, of very large cent parallel side Walls. The open inlet c--d
dimensions'inj order‘ to work a- largejvolume of lies at the fourth side of'the driving jet.‘
.The :jet‘ of ‘driving, medium_ emerging from
the medium per unit
the nozzle 8, and entering the channel at, a, 20
‘tangentially, ;to the; curved wall aeeb, tends to
continueits ‘movement in;a straight line.‘ This
tendency cause'sa depression‘ along the curved
. i The object of the-present invention is to ‘elimi
nate these disadvantages, in such a._.way;_that‘,
though the driven mediumis ,forced to ; enter the
path of the drivingjehathisds done without con
wall (rib and in the driving 'jet itself. 7 The me-v
dium-situated, for example'at cg is set in motion 25
?ning it in a plurality of- rotating;channels. ~ Ace
cording tothe invention“ the jetzof driving me
dium afterrleaving the nozzle, enters ar-channel 'by this pressure differencajtoWards the, point
tangentially, or; approximately"tangentially, -_to oflowest pressure and thus is forced into the
a curved‘ wall forming one of the sidesoipsaid vpath of the driving medium. By; the collison'
channel, the (suction opening . for . the passive, rnei ‘of driving and drawn in (passive) media, the
direction of ‘movement of both will-be altered,
30 dium being located on the side of the nozzle op:
resulting inv only-one stream in which, the two 3
posite jtogthis ‘curved
are completely mixed. The passive medium thus
Constructional examples of ‘the. subject mat
ter of the invention are illustrated in the ac . never reaches the point of lowestrpressure and
companying drawings, in connection with which consequently the depression is kept up undimi
the action of the apparatus will now be more nished and an uninterrupted in?ow of passive 35
medium results. The resulting stream again
‘’ fully described.
Fig. 1 is a longitudinal section through one causes a depression along'the next part of the
curved wall, with the similar result of drawing
form of jet device according to the present in
in passive medium again.
The impulse of the resulting stream after the
Fig. 2 is a cross section on the line _II——II of
40 Fig. 1.
collision is the geometrical resultant of the two
original impulses of driving and driven'media.
’ Fig. 3 is a cross section on the line III—III of
Fig. 1.
Fig. 4 is a cross sec tion
of a modi?ed construc
tional form.
Figs. 5 and 6 show diagrammatically a con
. structional form in whichv the passage of the
: The direction of the resulting stream is parallel
to a tangent to the curved wall al-—b'. The cur
vature of this wall, therefore, is to be calculated 45
from the impulses of the two component streams
of driving and driven media. For instance, if
it be required that equal amounts of passive me
Figs. '7 and 8 are a top plan and side View,’ dium be'drawn in per unit of length of the suc
respectively, of a further modi?ed constructional tion opening c--d, the curve a~—b should be a
jet device is curved in two directions.
'In the form of construction shown in Figs. ’
1, 2 and 3 the jet chamber has substantially the
shape'of a flat box of approximately rectangu
‘lar cross-section, the internal width of which
If the passive medium is a gas, the velocity
of influx may, under certain circumstances, rise
above the critical (sound) velocity. In this case
the suction opening should show a contraction
(6 in Fig. 4): it must consist of a converging
2. A jet apparatus as claimed in claim 1, where
and a diverging part, for the purpose of acceler ' in the side walls of said chamber at the suction in
ating the gas movement, gradually to above let converge toward and then diverge from each
the critical velocity, with as little loss of energy other in the direction of ?ow, thereby to accelerate
as possible. Figure 4 shows suction inlet of the the motion of the passive medium gradually to a
kind in question.
velocity above the critical gas velocity with a
It may be preferable, mainly for constructional minimum loss of energy.
reasons, to give the channel a curved shape in
3. A jet apparatus as claimed in claim 1, where
stead of a ?at one, as shown in Figs. 1, 2 and 3.
in the side walls of said chamber are curved trans
10 The channel may be bent, say into a cylindri
versely, thereby imparting a curved shape to the
cal form, as shown diagrammatically in Figs.,5 channel.
and 6. The channel, in this case, is formed by
4. A jet apparatus as claimed in claim 1, where
the annular space 1‘, between the two cylindrical in the side walls are concentric helical surfaces.
shells g and h. This annular space is shown in
5. A jet apparatus as claimed in claim 1, where
Fig. 5 as if it were a solid body. The curved in the Wall means of said chamber de?ne a plu
wall, denoted by w-b in the ?at channel of Fig.
1 here takes the shape of a helix with a varying
pitch. (In Fig. 5 the same designation a—b is
Various combinations are possible. Thus Figs.
7 and 8 show, diagrammatically, a combination
of a number of jet devices working parallel with
each other. Owing to the fact that these devices
are arranged symmetrically around an axis, the
IO GI driving jets being all directed towards this axis,
the walls k: of Fig. 1, situated opposite the curved
walls a—b‘ of the several channels, would coin
cide and may, therefore, be omitted entirely.
The passive medium may, furthermore, be drawn
30 in stages. If the ?rst jet device be so dimen
sioned that only a portion of the total amount
of passive medium is actually sucked in, the re;
sultant stream of this ?rst jet device may act in
a succeeding device as the driving jet. This may
35 be repeated, thus obtaining a number of jet de
vices, arranged in series, worked by only one
primary driving jeti
What I claim is:-—
rality of channels arranged symmetrically about
and merging into each other along a central axis,
the curved wall of each channel being spaced
from‘ the axis and the several nozzles being di
rected towards the axis.
6. A jet apparatus as claimed in claim 1, where
in said nozzle produces a jet of driving medium
having a thickness substantially equal to the
Width of the channel.
7. In a jet device, a chamber having walls form
ing a channel having an inlet end and an outlet
end, a nozzle at the inlet end of said channel
fordirecting a jet of a driving medium substan
tially transversely of the open inlet end of the
channel, one wall of the chamber being tangent
to the nozzle and convexly curving progressively
from the nozzle, whereby the reduction in pres
sure at the surface of the curved wall de?ects the
jet of driving medium to flow along the curved
wall and thereby produce a moving stream of re
duced pressure, the mass of the stream being con
tinuously increased by the sucking up of passive
1. In a jet device, a chamber having walls
forming a channel open at both ends and of ap
proximately rectangular cross-section, the side
walls being substantially uniformly spaced and
one edge wall being curved with its convex side
towards the channel, and a nozzle at and sub
45 stantially tangential to the inlet end of said
curved edge wall for directing a jet of driving
medium through the uncon?ned side of the
8. The invention as claimed in claim '7, where
in the cross-section of said channel is approxi
mately rectangular, the walls of said chamber ad
jacent said curved wall being uniformly spaced
from each other.
9. The invention as claimed in claim 7, where
in the cross-section of said channel is approxi
medium substantially transversely of the open
end of the channel adjacent said nozzle, whereby
the jet of driving medium is uncon?ned along
mately rectangular, the walls of said chamber
adjacent said curved Wall being uniformly spaced
one side and that open side serves as the suc
tion inlet for the passive medium.
from each other and curved to de?ne a helical
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