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Патент USA US3030989

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April 24; 1962
R. J. REILLY
3,030,979
INDUCTION FLUID AMPLIFIER
Filed Nov. 16, 1960
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3 Sheets-Sheet -1
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CONDITION
RESPONSIVE
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INDUCTION
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CONSTANT
TYPE
FLUID
OPERATED
DEvIcE
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FLUID
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A
FLUID
SOURCE
AMPLIFIER
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INVENTOR.
RICHARD J. REILLY
A TTORIVEY
_ April 24, 1962
R. J. REILLY
3,030,979
INDUCTION FLUID AMPLIFIER
Filed Nov. 16, 1960
3 Sheets-Sheet 2
INVENTOR.
RICHARD J. REILLY
BY
A TTOR/VEYJ
Apnl 24, 1962
R. J. REILLY
I
3,030,979
INDUCTION FLUID’ AMPLIFIER
Filed Nov. 16, 1960
s Sheets-Sheet 3
46 1|
l'wimim m I
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H4
INVENTOR.
RICHARD J. REILLY
BY WWW
ATTORNEY
United States atent O?ice
_
1
2
?ow back to its original position. The momentum trans
fer and pressure locking arrangement operate well in cer
tain applications but still do not provide the answer in
3,030,979
INDUCTION FLUID AMPLIFIER
3,030,979
Patented Apr. 24, 1962
-
Richard J. Reilly, St. Paul, Minn., assignor to Minne
certain other conditions as does the invention of the
apolis-Honeywell Regulator Company, Minneapolis,
present application.
Minn., a corporation of Delaware
Filed Nov. 16, 1960, Ser. No. 69,645
13 Claims. (Cl. 137-62414)
'The present invention is speci?cally directed to a ?uid
ampli?er element or system wherein a ?ow of ?uid is
supplied constantly to a primary nozzle in a closed ?uid
system. The constant ?ow passes out of the nozzle and
The present invention is directed to a unique type of
induction ?uid ampli?er or element that utilizes the vis 10 down one or more ?uid channel outlets. In order to
cous forces existing between ?owing ?uids and associated
move the main ?uid ?ow from ‘its normal ?ow, it is pos
?uids or ?xed partitions. More speci?cally, the present
sible to interject a ?uid ?owing parallel to the original
invention is directed to a ?uid ?ow element or system
?uid ?ow from a side ori?ce or secondary inlet. The
that utilizes no moving parts in control of a main ?uid
secondary inlet ?ow is directed down a wall of one of
stream by the use of an inducing controlled ?uid stream. 15 the outlets of the ampli?er element and attaches itself
A continuing e?ort has been underway to simplify and
to the wall due to the viscous forces which exist in the
thereby improve the reliability of various systems. This
?uid. As long as the ?uid is ?owing along the wall there
is true in ?uid control systems where the ?uid control
are no major forces which tend to divest it of its attach
devices have been improved by the reduction in the num
ment to the wall. The ?ow of the ?uid along the wall,
ber of movable parts. In the process of simpli?cation, it 20 from a control or secondary ori?ce, induces the main ?uid
has been felt that it would be desirable to have a ?uid
?ow from the primary outlet to follow along with the
control system which utilizes no moving parts other than
secondary ?ow due to the viscous forces that exist be
the controlled ?uid. Certain systems have either ap
tween the two ?owing ?uids.
poached or reached this optimum condition and rely basi
With the arrangement just described, there is pratically
cally on a transfer of momentum or pressure differen
tials for their operation. These systems undoubtedly are
ideal for certain applications but there is an area of ap
25
no transfer of momentum from the side inlets or sec-v
ondary ?uid ?ow inlets to the primary ?uid ?ow inlet,
but merely a control function by an attraction between
plication that requires other approaches. The present
the two ?uid ?ows due to the viscous forces that exist
invention helps complete the grouping of ?uid control
between these two ?ows. The ?ow of the primary inlet
30
elements or ampli?ers that utilize ?uid characteristics as
in no way locks to the walls of the outlets but merely
a means of control as opposed to mechanically movable
follows the guide or secondary ?ow as long as the sec
elements.
More speci?cally, it has been recognized that a ?uid
ondary ?ows exists. If the secondary ?ow is caused to
stop, the primary inlet ?ow would revert to its original
?owing continuously from a nozzle can be diverted from
direction and ?ow outlets.
a straight line by jets applied to the side of the main 35
By utilizing this concept it is possible to build a ?uid
?uid nozzle. The jets cause ?uid to impinge on the main
control element or ampli?er that utilizes the viscous
?uid jet, thereby diverting it to a side. This type of
forces for controlling a main ?uid ?ow by reason of the
unit has been long recognized and utilizes a momentum
secondary ?uid ?ows from one or more inlets along the
transfer arrangement for operation. That is, the momen
various outlet paths from the ?uid control elements. This
tum of the side jet impinging on the center or primary 40 arrangement will be described in detail in connection
jet causes the primary jet to be diverted. The diversion
with the present speci?cation and will be explained in
of the primary jet can then be used for a control func
various versions of speci?c physical con?gurations.
tion. This type of arrangement is desirable in certain
It is a primary object of the present invention to pro
systems but has certain defects, including the require
vide a basic ?uid control element or ?uid control system
ment that the impinging ?ow be of substantial momen 45 which can control any type of ?uid material without the
turn in order to move the higher volume center ?ow
need of a single moving part.
from What would be its ordinary course of travel. The
Another object of the present invention is to provide
momentum transfer principle has been used for years in
an ampli?er element that utilizes the viscous forces exist
certain types of devices but is not acceptable for certain
ing between a ?owing ?uid and either a ?xed wall or
types of ampli?cation because of the high amount of
another ?owing ?uid to gain control of a large ?uid ?ow
energy required in the side jets.
with a relatively small controlled ?uid ?ow.
More recently, a ?uid control element or system has
Yet another object of the present invention is to pro—
been developed which utilizes a main or center ?uid ?ow
vide a ?uid control element or system that provides a con
and a side jet which diverts the main or center ?ow. The
trol function, such as ampli?cation of a small ?uid signal
diversion, once it occurs, is stable because of a pressure 55 to a large signal, and yet uses no moving parts.
differential which occurs across the main ?uid ?ow
Yet a further object of the present invention is to pro
stream by means of the walls of the system that contain
vide a ?uid control element that can be responsive to its
the ?uid ?ow. More speci?cally, in a system of this
own output to' yield a stable condition or an oscillatory
nature, the main ?uid ?ow is diverted by a side jet and
condition, depending on the arrangement of the feedback
60
the side jet moves the main control ?ow by a momentum
of the output to the input of the unit.
type principle. Once the ?uid has moved, it locks itself
And still another object'of the present invention is to
onto a wall of the ?uid ?ow passage because the high
provide a basic ?uid control element that can be used by
velocity of the ?uid ?ow along the wall creates a lower
itself or in cascade to control a ?uid ?ow without the use
pressure than the velocity of the outer surface along an
of valves, veins, or other mechanically movable ex
65
open area adjacent the other wall of the ?uid ?ow pas
sage. This pressure di?erential keeps the main ?uid ?ow
These and other objects of the present invention will
locked to the outer wall until the pressure differential is
becomeapparent when the present speci?cation and draw
pedients.
-
~
‘
~.
.
,7
relieved. This can be accomplished by energizing a jet
ings are fully considered.
on the side opposite from the original jet and thereby
In the present drawings,
70
relieving the pressure. The second jet can be used either
FIGURE 1 is a schematic representation of a typical
‘to relieve the pressure or to direct the main stream of
system utilizing an induction type ?uid ampli?er;
3,030,979
3
4
extent modulation is possible, if desired. In order to make
this selection, two additional channels 32 and 33 are pro
vided. Channels 32 and 33 are of smaller cross section
than the balance of the channels as they are the control
in FIGURE 2 is an isometric view of a simple induction
?uid ampli?er element itself;
FIGURE 3 is an exploded isometric view of a ?uid
ampli?er element that utilizes feedback arrangements to
elements and require a much smaller ?ow than is present
in the primary ?uid channel 25. The secondary ?uid inlet
means or channels 32 and 33 have inlets 16 and 17 to cor‘
,in turn provide an oscillatory output; ‘and,
FIGURE 4 is a diagrammatic view of ‘the device of
FIGURE 3 in one plane with the interconnecting ?uid
respond to the‘ disclosure in FIGURE 1. 'Ihe'channel 32
paths shown external to the unit for clarity’s sake.
and the channel 33'gradually slope in and follow the walls
The schematic system disclosed in FIGURE 1 incor
porates an induction type ?uid ampli?er at 10 of the type 10 34 and 35 of the plate 23 so ‘that any ?uid introduced into
the inlets 16 or 17 pass through the channels 32 or 33
‘disclosed in the present application. The ?uid ampli?er
and then continue along adjacent to their respective wall
10 is fed from a constant ?uid source 11 and is controlled
through a condition responsive device 12. The ?uid con
34 or 35.
»
>
At this point it should be pointed out that the plates 23
dition responsive device ‘12' is shown as obtaining its
energizing ?uid from the constant ?uid source 11 and pro
15 and 24 can be manufactured of any convenient material
which is compatible with the ?uid to be used‘. If the
viding two outputs 14 and 15 ‘to the secondary ?uid inlets
?uid being utilized is such as water or air, the plates 23
16 and 17 of the induction ?uid ampli?er 10. The manner
and 24 could readily be made of plastic, metal, ceramic,
‘in which this control comes about will become apparent
or any other common type of material; It can be readily
with the discussion of the detailed FIGURES 2 and 3.
The induction type ?uid ampli?er 10‘ has a pair of ?uid 20 seen that the various channels ‘can be milled or cast into
the surface of the plate 23 and then sealed ?uid-‘tight ‘by
?ow outlet means 20‘ and 21. The outlet 20 is connected
the plate 24 being cemented to the top of plate 23.
directly back to the constant ?uid source 11 while the
In operation, a ?uid, such as water, entering the_pri-'
outletmeans ‘21 is connected to a ?uid operated device 22.
mary ?uid inlet 25 would ?owequally into the outlet chan*
The output of the ?uid operated device 22 is then fed back
25 nels 30 and 31. If a signal is introduced, say into‘ the
to the constant ?uid source 11.
Thesystem disclosed in FIGURE 1 could be compared
to the following typical heating system. The constant
secondary ?uid inlet 16, and passes through the channel
?uid source 11 could be a hot water boiler and pump
channel 30. The control ?uid passing through channel
32 adheres to the wall 34 due to the viscous forces that
32, it would ?ow along the wall 34 and out of the outlet
which supply hot water to the induction type ?uid ampli
?er 10. The hot water is either passed around the ?uid 30 exist between a ?owing ?uid and a ?xed wall or second
arily ?owing ?uid. The ?oW of the control ?uid along
operated device 22, which would be a radiator, or through
the wall 34 would attract through these viscous forces the
the device 22. Depending on whether the ?uid ?owed
?uid being injected into the primary ?uid inlet 25. All
around the device 22 or through it, the space in which the
of the ?uid coming into the inlet 25 would .thus divert
radiator was located would be heated. The condition
responsive device 12 could be a thermostat which utilizes 35 and pass out of the outlet channel 30 and through the
outlet opening 20. It should be noted that the cross sec
tional area of the channel 30 normally is equal to or
larger than the cross sectional area of the primaryvinlet
channel 25 combined with the cross sectional area of the
means 17 to cause the main ?ow to pass through the ?uid 40 channel 32.
operated device 22. It can thus be seen that the system
If at any time it is desired to cause the ?ow of ?uid to
hot water from the constant ?uid source 11 and in turn
controls the induction type ?uid ampli?er 10 by either
causing ?ow into the secondary ?uid inlet 16 to bypass the
?uid operated device 22, or in the secondary ?uid inlet
cease passing through the outlet channel 30, it is only
of FIGURE 1, while being schematic in nature, could
readily represent a heating system and plant utilizing
necessary to introduce a ?uid ?ow to opening 17 and thus
thermostatic control over the ?ow of hot water through
into channel 33. At the same time the ?uid being intro
the system. The details of the induction type ?uid am
duced into channel 32 would be cut off and the only
pli?er 10 will now be explained in connection with FIG 45 fluid being introduced for control purposes would pass
into and along channel 33 following wall 35. This would
URES 2 and 3.
then attract the primary ?ow from the inlet 25 through
In FIGURE 2 the induction ?uid ampli?er 10 is made
the outlet channel 31 and outlet 21. It can thus be seen
up of a ?at plate 23 which has’ a number of grooves or
that, by introducing a slight ?uid ?ow in a proper control
channels cut into it. These channels could be drilled or
50
channel, a larger ?uid ?ow can be diverted from a pri
formed to have any con?guration. They do not have to
mary inlet to one of a group of speci?c outlets. If the
‘be rectangular. The plate 23 is covered by a plate 24 to
‘control signal is removed from both the inlets 16 and 17,
form a ?uid-tight system of channels. The manner in
any ?uid ?owing into the inlet means 25 would split sub
which the plates 23 and 24 are clamped or sealed together
is not material but could be accomplished by bonding of 55 stantially equally, depending on the geometry of the cham
ber 26 and the outlets 30 and 31.
the plates by means of an adhesive, clamping of the plates
On tests of the device of the type disclosed, ?uid re
vtogether, or screwing them together by any other means,
sponse has been excellent in that the ?uid ?owing in the
‘not shown. All that is required is that the plates 23 and
primary inlet 25 was switched between the outlets 30 and
24 form a ?uid-tight arrangement so that ?uid can ?ow
31 by the introduction of a small control signal. For
through speci?c channels that will be detailed below.
A primary ?uid inlet means 25 is disclosed as a rec
60 this reason it can be seen that an ampli?er has been built
tangular channel cut into plate 23. The primary ?uid inlet
means 25 is directed into a larger cavity 26 which is sep
arated by divider 27 into a ?ow outlet means in the form
of two individual channel means 30 and 31. Outlet chan
nel 30 has an outlet 20 and channel 31 has an outlet 21,
both of which correspond to the outlets disclosed in
and tested which utilizes a unique ‘principle that ‘allows
for switching of a ?owing ?uid between two outlets ‘with
out the use of any moving parts.
In FIGURES 3 and 4 there is disclosed an oscillator;
utilizing the principles disclosed in connection with FIG- '_ .
URES 1 and 2. The oscillator in FIGURES" 3 and '4
does not ?t the schematic representation vof FIGURE '1
but is an entirely different type of induction type ?uid
‘FIGURE 1.
At this point it is obvious that if a ?uid were intro
duced on the primary ?uid inlet 25, it would ?ow into 70 ampli?er that operates on the principles disclosed previ
ously. More speci?cally, a plate 40, having a plurality
the chamber 26 and then split equally between the outlet
channels 30 and 31. It is the object of the present inven
tion to cause the ?uid entering into the primary ?uid’inlet
25 to be wholly diverted into either channel 30 or .into
channel 31, as selected by an outside condition. To some 76
of channels cut into it, is supplied along with cover plates
41, 42, and 43. The cover plates‘ 41, 42, and 43 have
various interconnecting channels cut into them and when
the plates 40 through 43 are assembled, by any conven
‘5
3,030,979
6
ient means, a number of interconnecting passages are de
veloped that did not exist in the device disclosed in FIG
URE 2. The plate 40 has a primary ?uid inlet 44 which
empties into a chamber 45 that in turn supplies ?uid to
two outlet channels 46 and 47. These areas correspond
' ?uid could be in the form of a gas, a liquid, a combination
of a gas and a liquid, or any other type of material which
will ?ow under pressure. It should further be under
stood that the ?uid ?owing in the primary inlet can be
> wholly different from the ?uid ‘being used to control the
exactly with the similar areas in FIGURE 2.
device as long as there is a sufficient energy in the viscous
Two secondary inlet channels are provided at 50 and
layer that connects the two ?uids as they ?ow along the
51 and correspond to the channels 32 and 33 of FIG
walls of the ?uid ampli?er. It is further noted that
URE 2. The inlet channels 50 and 51 have ?ow di
the term “element” has been used in referring to the
rected along walls 52 and 53 so that any ?uid entering 10 present device, but it is noted that the present device could
the passages 50 or 51 ?ows along their adjacent wall and
be readily considered an over-all system or ?uid ampli?er
down to the outlets 46 and 47. To this point the de
as well as ‘an individual element. The elements utilized
scription of FIGURE 3 is identical to the con?guration
could 'be cascaded so that one would control a succeeding
of FIGURE 2.
element. More speci?cally, it would be possible to utilize
In addition, two feedback channels are disclosed in 15 an induction ?uid ampli?er 10 of ‘FIGURE 1 land a pair
FIGURE 3 that provide ?uid ?ow in the unit so that the
of induction ?uid ampli?ers in the condition responsive
unit will oscillate. More speci?cally, a pair of feedback
device at 12 so that one ?uid ampli?er was used to con
channels starting at 54 and 55 are provided in the walls
trol a succeeding ?uid ampli?er.
52 and 53. Each of the feedback channels 54 and 55 are
Since the device disclosed in the present application
designed to scoop part of the ?uid ?owing along the adja 20 is of an exceedingly basic nature, it is obvious that endless
cent wall into the channel or feedback passage thereby
numbers of modi?cations and variations are possible. As
providing ?uid that will ?ow through the following de
such, the applicant wishes to be limited in the scope of
scribed passages. In connection with the feedback chan
his invention only by the scope of the appended claims.
nel 54, a passage 56 is provided which passes up into
I claim as my invention:
_
plate 41 by means of opening 57 and then into plate 42 25 v‘1. A ?uid control element having primary ?uid inlet
and the elongated passage 60. The elongated passage 60
means supplied with a ?uid to be controlled; ?uid ?ow
provides an opening to a hole 61 that passes back through
outlet means; secondary ?uid inlet means adjacent said
the plate 41 to a passage ‘62 that interconnects into the
primary ?uid inlet means and having an opening directed
channel 51. It can thus be seen that when all of the
along a wall of said outlet means; and a secondary ?uid
plates are laminated together, the passage or feedback 30 ?ow issuing from said secondary inlet means following
channel 54 connects the output channel 46 through the
along said wall; said secondary ?uid ?ow inducing said
passage 56, hole 57, passage 60, hole 61, and passage 62
primary HOW to follow said secondary ?ow in said ?uid
into the secondary inlet channel 51 to provide a ?uid
?ow outlet means by forces existing between said ?ows.
?ow along wall 53.
2. A ?uid ampli?er having primary ?uid inlet means
A second feedback passage starting at 55 passes down 35 supplied with a ?uid to ‘be controlled; ?uid ?ow outlet
through the plate 40 along 64 into an elongated groove 65
means; control ?uid inlet means adjacent said primary
in plate 43 and then back up into a groove 66 which con
?uid inlet means and having an opening directed along a
nects at 67 into the secondary fluid inlet 50. In this
wall of said outlet means; and a control ?uid ?ow of sub
case, some ?uid ?owing down along the wall 53 is picked
stantially smaller magnitude than said controlled ?uid
up by the feedback passage 55 and is fed back through 40 issuing from said control inlet means following along
the associated passages to the inlet channel 50, thereby
said wall; said control ?uid ?ow inducing said controlled
providing a cross linkage between the outlet 47 and the
?ow to follow said control ?ow in said outlet means by
secondary ?uid inlet at 50.
forces existing between said ?ows.
A description of operation of this particular unit will
3. A ?uid control element having primary ?uid inlet
aid understanding of the constructional details. If ?uid 45 means supplied with a ?uid to be controlled; ?uid ?ow
is injected in the main inlet 44 and passes into the cham
outlet means; secondary ?uid inlet means adjacent said
ber 45, it would divide equally between the outlets 46
primary ?uid inlet means and having an opening directed
and 47. By supplying a control pulse of ?uid into the
‘along a wall of said outlet means; and a secondary ?uid
inlet passage 50, ?uid would ?ow along the wall 52 and
?ow of a second ?uid issuing from said secondary inlet
down to the feedback passage 54 as well as out of the out
let 46. This would immediately induce all of the ?uid
?owing in the primary inlet 44 to shift along wall 52 and
50 means following ‘along said wall; said ?uid ?ow outlet
would create a ?ow into the inlet of the feedback passage
54. This feedback ?uid then passes up through the
plates 41 and 42 and crosses over the unit, coming back 55
down into the inlet 62 and secondary ?uid inlet 51. The
?ow of ?uid into the chamber 45 from the secondary inlet
means capable of handling both said ?uid ?ows; said
secondary ?uid ?ow inducing said primary ?ow to follow
said secondary ?ow in said ?uid ?ow outlet means by
viscous forces existing between said ?ows.
4. A ?uid control element having a primary ?uid inlet
supplied with a ?uid to be controlled; a plurality of ?uid
?ow outlets; secondary ?uid inlet means adjacent said
51 causes all of the ?uid to shift from the wall 52 over to
primary ?uid inlet and having an opening directed along
the wall 53. This immediately causes a feedback flow
a wall of one of said outlets; and a secondary ?uid ?ow
into the feedback passage 55 which is connected back to 60 issuing from said secondary inlet means following along
the secondary inlet 50. This again causes the unit to
said wall; said ?uid ?ow outlets each being capable of
switch from ?ow along wall 53 to wall 52. It can thus
handling
said ?uid ?ows; said secondary ?uid ?ow in
be seen that an oscillatory function occurs once the unit
ducing the ?ow from said primary inlet to follow said
has been started.
secondary ?ow in said ?uid ?ow outlet having said wall
In a unit of the type disclosed in FIGURES 3 and 4, 65 by forces existing between said ?ows.
an oscillator which has a continuous change of function
has been fully described. This unit can be modi?ed in
many ways. More speci?cally, a feedback passage could
be utilized connecting one of the outlet passages to its
5. A ?uid control element having a primary ?uid inlet
continuously supplied with a ?uid to v‘be controlled; a plu
rality of ?uid ?ow outlets; ‘a secondary ?uid inlet adjacent
said primary ?uid inlet and having an opening directed
own control secondary inlet thereby locking the system 70 along a wall of one of said outlets; and a secondary ?uid
on one wall once the unit had started. This would en
?ow of said’ ?uid issuing from said secondary inlet and
tail a single feedback passage without the cross-over
following along said wall; said ?uid ?ow outlets each
feature.
being capable of handling both of said ?uid ?ows; said
In the description of the devices in FIGURES 1 to 4,
secondary ?uid ?ow inducing substantially all of said
the term “?uid" has been used in its broadest sense. The 75 primary ?ow from said primary inlet to follow said sec
3,030,979
8
ondary ?ow vin the ?uid ?ow outlet ‘having said wall by
directed along an adjacent wall of said outlet means; feed
viscous forces existing between said ?ows.
6. A fluid control element having primary ?uid inlet
back ?ow means connecting said outlet means to said sec
ondary ?uid inlet means; and secondary ?uid ?ow issuing
means supplied with a ?uid to be controlled; two ?uid
from said secondary inlet means and following along said
?ow outlet channels; two secondary ?uid inlets each ad
jacent opposite sides of said primary ?uid inlet means
and each having an opening directed along an adjacent
wall .of said outlet channels; and a secondary ?uid ?ow
issuing‘ from a selected one of said secondary inlets and
following along said adjacent wall;vsaid secondary ?uid
?ow inducing said primary flow to ‘follow said secondary
.?ow by the forces existing between said ?ows.
7. A ?uid control element 'having primary ?uid inlet
means supplied with a ?uid to be controlled; two ?uid
adjacent wall; said secondary ?uid ?ow inducing said pri
mary ?ow to follow said secondary flow by the forces ex
isting between said ?ows with said feedback channel means
supplying ?uid from said outlet means to said secondary
?uid inlet means.
11. A ?uid control element having primary ?uid inlet
vmeans continuously supplied with a ?uid to be controlled;
a plurality of ?uid ?ow outlets; secondary ?uid inlet means
adjacent a side of said primary ?uid inlet means and hav~
ing an opening directed along an adjacent Wall of said
?ow outlet channels; two secondary ?uid inlets each ad 15 outlet means; feedback channel means connecting an
outlet to said secondary ?uid inlet means; and secondary
j acent opposite sides of said primary ?uid inlet means and
?uid ?ow issuing from said secondary inlet means and
each having an opening directed along an adjacent wall
of said outlet channels; ‘and a secondary ?uid ?ow of a
second ?uid issuing ‘from a selected one of said secondary
following along said adjacent wall; said secondary ?uid
?ow inducing said primary ?ow to follow said secondary
inlets and following along said vadjacent. wall; each said 20 ?ow by the viscous forces existing between said ?ows with
said feedback ‘channel means supplying ?uid from said
.outlet channel being capable of handling both of said ?uid
outlet to said secondary ?uid inlet means.
?ows; said secondary ‘?uid ?ow inducing said primary
12. A ‘?uid‘control element having a primary ?uid inlet
?ow to follow said secondary ?ow by the viscous forces
continuously supplied with a ?uid to be controlled; two
8. ‘A ?uid ampli?er having a primary ?uid inlet con 25 ?uid ?ow outlets; two secondary ?uid inlets adjacent op
posite sides of said primary ?uid inlet and each having
tinuously supplied with a ?uid to be controlled; two ?uid
an opening directed along an adjacent wall of said outlets;
?ow outlet channels; two control inlets each adjacent op
existing between said flows.
positesides of said primary ?uid inlet and each having
.an opening directed along an adjacent wall of said outlet
channels; and a control ?uid ?ow ofsubstantially smaller
magnitude than said controlled ?uid issuing from a se
lected one ofsaid control inlets and ‘following along said
adjacent wall; said control ?ow inducing said controlled
?ow to follow said control ?ow by the viscous forces exist
a feedback channel lconnectingiat least one of said outlets
to at least one of said secondary ?uid inlets; and‘second
ary ?uid ?ow issuing from one of said secondary inlet
and following along said adjacent wall; each said outlets
being capable of handling substantially all of said fluid
?ows at any one time; said secondary ?uid ?ow inducing
said primary ?ow to follow said secondary ?ow by the
viscous forces existing between said ?ows with said feed
back channel means supplying ?uid from said outlet to
'9. A ?uid control element having a primary ?uid inlet
said secondary ?uid inlet.
continuously supplied with a ?uid to be controlled; two
13. A ?uid oscillator element having a primary ?uid
?uid ?ow outlet channels; two secondary ?uid inlets each
inlet continuously supplied with a ?uid; two ?uid ?ow
adjacent opposite sides of said primary ?uid inlet and
each having an opening directed along an adjacent wall 40 outlets; two secondary ?uid inlets adjacent opposite sides
of said primary ?uid inlet and each having an opening
of saidoutlet‘channels; and a secondary ‘?uid ?ow issuing
.directed along an adjacent wall of said outlets; a feedback
vfroma selected one of said secondary-inlets and following
channel connecting each outlet to a secondary ?uid inlet
along said adjacent wall; each said outlet channel being
on the opposite side of said primary inlet; and secondary
capable vof handling both of said ?uid ?ows; said second
?uid ?ow issuing from said secondary inlets and follow
ary ?uid ?ow inducing substantially all of said primary
‘ing along the adjacent walls; each said ‘outlets being ca
?ow to follow said secondary ?ow in the outlet channel
pable of handling all of said ‘fluid flows; said secondary
adjacent said selected secondary inlet by the viscous forces
?uid ?ow inducing said primary ?ow to follow said sec
‘existing between said ?ows; said primary ?ow changing
ondary ?ow by the viscous forces existing between said
to‘the‘other outletchannel upon said secondary ?uid ?ow
issuing from'the other of the secondary inlets instead of 50 ?ows with said feedback channels supplying ?uid from
said outlets to said secondary ?uid inlets alternately there
the ?rst selected secondary inlet.
by switching said primary ?uid ?ow between the ?uid ?ow > 1 ‘
10. A ?uid control element having primary ?uid inlet
outlets.
~
means supplied with a ?uid to be controlled; ?uid ?ow
ing between said ?ows.
outlet means; secondary ?uid inlet means adjacent a side
of said primary ?uid inlet means and having an opening 55
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