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Патент USA US3066885

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Dec. 4, 1962
550m@ 0b'
United States Patent free
Patented Dec.. ¿.li, i352
outer nozzle portion which is disposed in axial alignment
with the ejector body liquid passage.
In accordance with the present invention the interior
of the nozzle portion surrounding the ejector tip is formed
Louis Gbidniatr., 7435 de i’lìpee Ave.,
Montreal, Quebec, Canada
Filed Sept. l5, 195€., der. No. ’îdlßflß
l Claim. (tCi. Z39-»4TH
at an angle slightly greater than that of the exterior of
the ejector tip so as to provide therebetween a conical
air discharge passage converging from the air chamber
'to the outer nozzle discharge passage. The outer nozzle,
as previously mentioned, is adjustably mounted on the
The present invention relates to improvements in the
construction of liquid ejector nozzles, and more particu
larly to improvements in nozzles of this type adapted to
ejector body, preferably by threaded engagement, so that
dispense a liquid spray by suction induced flow as op
While the use of a stream of pressurized gas, corn
by adjustment of the outer nozzle in the axial direction
relative to the ejector body the dimensions of the conical
air discharge passage can be varied from a fully open
pressed air for example, as a means of creating an aspirat
position providing a discharge capacity greater than that
ing eifect in an ejector nozzle is well ltnown in general,
an eifective simple way or" controlling the flow ot gas
and/or liquid has not been provided in the prior art
ejector nozzle constructions known to the applicant.
Usually, the pressurized gas is .directed in a high veloc
of the nozzle outlet passage to a fully closed position
sealing off the air discharge passage in advance of the
posed to direct pressure spraying of a pressurized liquid.
nozzle outlet passage.
Having t‘nus generally described the nature of the in~
vention, particular reference will be made to the accom
ity ñow past the open end of a liquid delivery tube so
as to create the aspirating effect drawing the liquid from
the tube, and by the mixing of the liquid with the air
creating an atomizing effect as it is ejected from the
panying drawing, showing by way of illustration a pre
ferred embodiment, and in which:
venticn as it would appear when utilized in combination
FIGURE l is a View in side elevation of an ejector
nozzle assembly constructed in accordance with the in~
In the most common form of such nozzle ar
rangements the air delivery or primary liow tube is dis
with a supply container of liquid, for example, a machine
posed axially of the liquid delivery or secondary flow
tool coolant.
tube with a portion of the outer tube in advance of the
FÍGURE 2 is a top plan view of the ejector nozzle
inner primary ñow tube serving as a mixing chamber.
construction shown in FIGURE l.
In this type of nozzle, the high velocity stream of pres
FIGURE 3 is an interior cross-sectional view of the
surized air, since it is disposed along the axis of the 30 construction shown in FlGURE 2 along the line 3--3.
nozzle, is in the axial centre of the mixing zone and tends
FEGURE 4 is an enlarged detail view, partially in
to form a cone extending through the nozzle to which
cross-section, to illustrate the connections of the liquid
the liquid drawn from the surrounding liquid tube engages
and air delivery conduit, leading from the supply tank
only by surface Contact. Accordingly, the ñow of liquid
shown to the ejector nozzle.
cannot possibly attain the speed of the pressurized gas
FIGURE 5 is a cross-sectional View of the construc
stream and therefore complete and eflicient mixing is
tion shown in FIGURE l along the line 5--5.
not achieved, Adjustment of the degree of atomization
FIGURE 6 is an enlarged detail View, in section,
is generally achieved by varying the size of the mixing
of the forward portion of the ejector nozzle construction
chamber so as to theoretically vary the quantity of liquid
of the invention to show the variance in angle between
withdrawn while maintaining the primary or pressurized 40 the interior walls of the outer nozzle and the exterior
air ñow constant, This is not too satisfactory and
of the ejector tip more clearly.
while it can be improved by the addition of a further
With particular reference to FIGURES 2, 3, 5 and 6
of the drawings, a preferred construction of an ejector
control, for example a separate valve, on the primary
ilow this of course complicates adjustment and adds to
nozzle in accordance with the invention consists essen
tially of a main body lli having a forward threaded ex
the cost of manufacture.
The present invention recognizes these disadvantages
tension l2 and a central recess lid adapted to receive a
generally cylindrical ejector body 16.
and aims to provide an improved ejector nozzle construc
tion wherein the liquid to be dispensed is forced to pass
directly into the high velocity primary air iiow and ac
The ejector body te is shaped to provide inwardly
extending annular recesses 255, 2ï and a forward por*
cordingly is completely mixed with the air. The present 50 tion 22 of reduced diameter and conically tapering forma
tion. The body portions 23, ’2.5 of maximum diameter
nozzle construction includes means whereby by a single
adjustment the discharge of liquid-air mixture can be
controlled from the finest mist to the heaviest spray and
further permits reversal of a portion of the primary air
ilow through the liquid delivery tube for cleaning pur
Accordingly, the invention is embodied in an ejector
nozzle assembly including an ejector body having at least.
are provided with annular grooves adapted to accom
modate seating rings 26 and the tail end ll‘î of the body
ld is threaded, as shown most clearly in FlGURE 3, to
threadably engage with a corresponding tapped opening
l@ provided in the ibase of the recess lid. rthe ejector
body ll@ is bored axially to provide a liquid conducting
passage 3% which is reduced in diameter, as indicated
at 32, at the body forward portion 22 providing a re
a forward portion of cylindrical formation and a liquid 60
stricted passage adapted to increase the velocity and
passage extending through the body with a terminal por
measure the quantity of liquid drawn therethrough.
tion of the ejector body surrounding the liquid passage
the `construction shown .the main body titl is bored trans
being of a reduced diameter relative to the remainder
versely of the axis of the recess i4- to provide ports 3d,
of the body and formed to constitute a conical liquid
36 leading into the annular recesses Ztl, 2i for the en
ejector tip. A hollow outer nozzle is adjustably mounted
trance of pressurized air and inducted liquid respec«
on the ejector body and includes a tapering conically
tively. These are supplied through conduits di), 42
shaped forward portion which iits over and surrounds
through ñttings nl, d3, as will be described in more detail
the liquid ejector tip in spaced relationship to provide an
later. A, further trans-axial recess ¿i6 extends through
»the lower portion of the annular recess 2l. into the liquid
air chamber between the exterior of the tip and the in
to complete the communication from the
terior of the nozzle. At least one recess is provided
conduit d2 while the ejector body portion 23 is provided
through the ejector body into the nozzle air chamber and
with .borings dit parallel to the main passage 3l? and
an axial recess is provided in the forward end of the
leading from ‘annular recess Zt? to the front face of the
body i6 to complete the communication from the con
duit ad.
The main controlling element of the assembly is a
hollow outer nozzle 6@ shaped so as to have a ñrst cylin
drical portion 62 adapted to fit over and threadably
engage the main‘body extension l2, and a ‘tapering conical
forward portion 6d adapted to tit over the ejector body
URE l.
ln this arrangement the conduits dd, 4Z extend
through a flexible metal hose 7d to a connection with a
liquid coolant supply tank 72’. and air supply line 46a,
through supporting block 36. The flexible metal hose 70
protects the conduits dit, 42 against physical damage and
at the same time provides a flexible support for the ejec
tor nozzle.
tip 22 in spaced apart relationship forming therebetween
As is shown most clearly in FIGURES 3 and 5, the
ejector nozzle assembly is connected to the end of the
deliveredthrough the conduit dit, enters the ejector body
block 3d is bored to provide a liquid conducting passage
a conically~shaped air passage ed, as shown most clearly lO hose 7d by a split casing 76 having end flanges engaging
the assembly body lll and an end sleeve '78 provided
in FlGURE 6. The nozzle portion
is axially re
on the hose ‘79. The por-tions of the casing 76 are held
cessed to provide an outlet passage
in concentric axial
together «by a screw ’79, as shown in FIGURE 5. The
alignment with «the ejector body passage 32, Titi.
other en_d of the hose 7i) is `similarly attached to a sup
With reference to FIGURE 6, the principle of this
porting block d@ mounted on a C-type clamp 8l suitable
rarrangement »is as follows. rThe pressurized lluid con
for attachment to a machine frame, for example. The
stituting the primary dow, for example compressed air
recess Ztl, passes through the ejector body and enters the
conical air passage 66. lt should be noted that the ex
9d and an air conducting passage 92 and the terminal
ends of the conduits dil, 42 are connected to these pas
the form of a tapered hollow cone with gradually con
verging side walls. This double-tapered or cone within
72, as indicated in FlGURE l. An air supply conduit
terior of the ejector tip is formed at converging angles 20 sages by suitable fittings, as previously described. An
extension conduit ¿i241 is connected into the liquid con
B while the interior walls of the nozzle portion ed are
ducting passage 92 and extends within the coolant tank
formed at a greater angle C, giving the air passage 66
Lide is also connected into the passage @il from a suit
a cone formation of the air passage de creates the best 25 able source of compressed air.
possible discharging conditions for the primary flow and
makes the unique control alîorded by the present inven
tion possible. To continue, the primary flow of air passes
As previously described, the action of the primary air
tlow delivered through the conduit ed creates an aspirat
ing effect on the conduit 42 drawing liquid up through the
conduit dita from the supply tank 72 and discharging it in
through the passage
Vto «the control section D and
atomized spray of any desired liquid content. This is
from the section D, having acquired high velocity, out 30
a furt er advantageous feature in the present construction
of the nozzle outlet passage
to atmosphere. Accord
/hich is particularly useful when the assembly is utilized
ingly, as previously explained, the form of the primary
flow is a hollow cone with its apex A aligned witn the
axial centre line of the Vnozzle outlet passage 63. 'l'his
form of discharge creates the desired maximum aspirat~
ing action and completely surrounds the conical ejector
tip 22 causing liquid to be sucked up through the con
duit ¿i2 into the liquid passages
and from the pas
for the spraying orf machine tool coolant as shown, or
similar liquids. The total cross-section of the air delivery
borings 49 in the ejector body portion 23 is greater than
the cross-section of the nozzle outlet discharge passage
As long as the cross~section D of the conical air dis
charge passage is adjusted so as Vto 'oe smaller than that
of the nozzle outlet passage 63 a pressure drop will occur
sage 32 into and through the point A of the primary
create the desired aspirating edect. However, if the
flow. lt will be appreciated that every drop of the liquid
nozzle 69 is advanced to the point where the section D is
in the secondary flow is pulled into the primary ilow
greater than that of the nozzle passage 63 there will b_e
and intimately mixed in the outlet passage @d prior to
no pressure drop or expansion in the section D and the
discharge. By this arrangement the two flows change
primary iiow of air will be forced back through the pas
their speed in the outlet passage ed and acquire some in
sages 32, 353 of the ejector body 22, through the conduit
termediate speed which is a »function of the two masses.
42 and into the supply tank 72. rIltis reverse flushing
'Since no part of the secondary or induced flow can
serves two purposes: (a) the flushing of the ejector body
escape the mixing in the outlet passage without being
and conduit d2, cleans the coolant tube and prevents possi
affected by the primary discharging flow, an ideal condi
ble clogging; and (b) the blowing in of air under pressure
'tion is achieved in which the primary and secondary flows
the coolant stirs it up and tends to homogenize
'are physically forced to exchange their speeds.
the suspension. All of the described effects are achieved
As the nozzle titl can be adjusted axially relative »to
easily and simply »by the rotation of the nozzle 6u relative
the ejector tip 22 and parallel to the centre line of the
to the main body lll without the necessity of providing
nozzle assembly, the dimensions of the air passage at the
sec-tion D can be increased or decreased. The axial
movement of the nozzle c@ does not in any way affect
supplementary valves or controls.
l claim:
îthe relationship of the angles B and C of the nozzle and
Vejector so that discharging conditions will remain un
ing an externally threaded extension at one end and an
An aspirator nozzle comprising an elongated body hav
axial blind recess opening into said one end, said body
including a pair of inlet ports spaced along said axial
dit, with a primary »iiow of constant pressure, varying
quantities of primary flow will be achieved and varying 60 recess for respective connection to a source of liquid and
pressurized fluid, an ejector body extending axially within
degrees of suction can be created and by such varia
said axial recess and terminally secured at one end at the
tion the mass of ejected liquid will automatically change
changed. Accordingly, by displacement of the nozzle
end of said blind recess opposite said threaded extension,
in relative proportion.
said ejector body including longitudinally spaced annular
For example, by retraction of the nozzle 6d to a point
Where the end of the ejector tip 22 is in actual contact 65 grooves each respectively communicating with one of said
inlet ports, said ejector body including an axial liquid
with the tapering inner walls of the outer nozzle it will
act as a valve and completely shut off the primary flow.
In the absence of primary dow, of course, no suc-tion is
created and there is no discharge of secondary flow or
receiving passage communicating with one of said annular
grooves for receiving liquid therefrom, said axial liquid
receiving passage terminating in a reduced cross-section
liquid. Extension of the nozzle ou from this position 70 at the terminal end thereof, said ejector body including
longitudinally spaced seal means circumposed about said
will gradually increase the dimensions of the conical air
body and isolating said annular grooves within'said axial
passage 66 at section D permitting liow of primary air
recess, said ejector body terminating in a frusto-conical
and consequent aspiration and discharge of liquid.
tip portion, having a base disposed at an annular face, said
A practical example of one preferred embodiment of
the ejector nozzle of the invention is shown in FIG 75 ejector body including longitudinally extending liuid pres
sure passage means opening into said annular face and
communicating with said other annular groove, and a
zle element being positionable in spaced relation from
said ejector body tip portion a sufficient extent to cause a
tubular nozzle element threadedly engaged on said thread
back pressure in said ejector body axial passage to keep
ed extension for free and ready manual longitudinal ad
the axial passage free of foreign matter and stir the liquid
justment thereon, seal means interposed between said 5 with which the axial passage normally communicates.
nozzle element and said ejector body, said nozzle element
including an outlet passage in coaxial, spaced alignment
References Cited in the file of this patent
with said reduced cross-section passage portion of said
ejector body, said nozzle element including a frusto
Walkup _______________ __ Apr. 17, 1906
conical internal chamber circumposed about said frusto 10
Lambeth ______________ __ Aug. 5, 1913
conical terminal tip portion of said ejector body, a projec
tion of the frusto-conical chamber terminating at an
Coleman ______________ _June 2, 1914
imaginary apex intermediately of said outlet passage and
Miller ________________ __ May 6,
Nettgens ______________ __ May 9,
Gibbons _____________ __ Aug. 24,
Scheurer ______________ __ Oct. 14,
at a greater angle than a projection of the outer surface of
said frusto~conical tip portion, said nozzle element being 15
retractable on said body whereby the terminal end of said
ejector body will engage said internal chamber wall and
no pressurized ñuid will flow to cause aspiration of liquid
from the axial passage of said ejector body, and said noz
Great Britain _________ __ June 1, 1955
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