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Патент USA US3046903

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SR
FIFSSGZ
39946;?33
July 31, 1962
.6903 mum“
W. L. CARLSON, JR, ETAL
3,046,893
CONDUCTIVE FLUID PUMP
Flled Jan
16
1961
CONTROLLABLE J24
POWER
SOURCE
POWER
SOURCE
BY
INVENTORS
WILLIAM L.CA_RLSON, JR.
RICHARD H. COLE
W 7% yr
ATTORNEY
United
"ie
ts
3,646,893
Patented July 31, 1962
2
1
3,046,893
CONDUCTIVE FLUID PUMP
William L. Carlson, Jr., Bloomington, and Richard H.
Cole, Crystal, Minn., assignors to Minneapolis-Honey
close a novel conductive [?uid pump that utilizes parallel
pumping channels to create a readily controllable output
pressure.
‘It is a further object of the present invention to disclose
well Regulator Company, Minneapolis, Minn., a cor
poration of Delaware
Filed Jan. 16, 1961, Ser. No. 83,002
a novel conductive ?uid pump that can be modulated with
The present invention utilizes the basic conductive ?uid
the single disclosed drawing is considered with the fol
a relatively small amount of control power to the input
of the pump.
It is yet a further object of the novel pump disclosed
5 Claims. (Cl. 103-1)
herein to provide :a self-compensating conductive ?uid
The present invention is directed to a conductive ?uid 10 pump that provides a self-generated ?ux which can be
pump that utilizes two ?uid pumping channels or conduits
altered to control the pressure output of the pump.
A still further object of the present disclosure is to pro
in the same magnetic structure, and is more speci?cally
vide a novel conductive ?uid pump unit which has a
directed to a conductive ?uid pump that is capable of be—
ing modulated due to a hydraulic circuit which incorpo
single magnetic structure for both the pump and the
rates the two conduits by the application of a small con 15 magnetic control circuit.
These and other objects will become apparent when
trol ?ux.
pump
by an
posed
?uid.
lowing speci?cation and claims.
theory wherein a conductive ?uid is caused to ?ow
The single drawing in the present application is an iso
electric current and a magnetic ?eld ‘angularly dis
to each other and to the direction of ?ow of the 20 metric view of a conductive ?uid pump having two paral
lel pumping channels that have common inlet means and
This type of pump has been recognized for some
time and is extensively used both for circulating large
quantities of conductive ?uids in coolant systems, as well
as being used as a pressure source for electromagnetic
hydraulic actuators. A typical electromagnetic hydraulic
actuator to which the present pump could be applied is
disclosed in U.S. Patent 2,948,118, to William L. Carlson,
Jr. et al. The actuator utilizes two variable volume cham
bers with an electromagnetic conductive ?uid pump be
common outlet means.
The electromagnetic conductive ?uid pump generally
disclosed at ‘10 is formed in a magnetic core means hav
25 ing three parallel lugs 11, 12 and 13. The legs 11 and
13 each have a gap shown at 14 and 15. The gaps 14
tween the chambers. The movement of ?uid from a reser
and 15 provide an opening for the electromagnetic con
ductive ?uid pump channels. The leg 12 is continuous
Connecting an upper magnetic member 16 to the lower
magnetic member 17 to complete the core structure. The
voir chamber into an output chamber provides for me
chanical motion which can be applied to a device, such
terial when the device is to be used on alternating current
core is preferably made up of a laminated magnetic ma
and can be made up of a solid magnetic material if the de
vice is to be used on direct current. The details of the
is a di?‘icult pump to modulate with a relatively small 35 core construction are believed to be conventional and
therefore warrant no further description.
quantity of electric power. The normal approaches to
A coil 20, which forms a ?ux generating means or the
modulation are to vary the power supply to the pump
control winding for the unit, is placed around leg 12 and
over a full range of zero to maximum power thereby
is shown in schematic form as a winding on a bobbin 21.
attaining a form of modulation. This type of modulation
requires the control of a large amount of electrical energy 40 Two conductors 22 and 23 connect to the coil 20 and lead
to a controllable power source 24. The controllable
and is an uneconomical manner of modulating an electro
power source supplies energization to coil 20 to supply a
magnetic conductive ?uid pump. Various other ways of
as a valve, as shown in Patent 2,948,118.
Due to the
nature of the electromagnetic conductive ?uid pump, it
?ux in the leg 12 which in turn branches into legs 11 and
13 depending upon the mode of operation of the device.
pressure changes.
45 This mode of operation will be explained in some detail
after a complete description of the electromagnetic con
In the present invention a simpli?ed method of modu
ductive ?uid pump.
lation of an electromagnetic conductive ?uid pump is
A hydraulic circuit having inlet means 25 and outlet
developed. This method of modulation utilizes two paral
lel electromagnetic conductive ?uid pumps having com
means 26 has two parallel conduits or ?uid paths 27
modulating pumps are known but these again require sub
stantial power changes in order to obtain the desired
mon inlet means and common outlet means.
The two 50 and 28.
electromagnetic conductive ?uid pumps utilize a single
magnetic structure and are of a type with a self-generated
magnetic ?ux. The self-generated magnetic ?ux is com
bined with a ?ux ‘generated by a control winding on a
The conduits 27 and 28 are bridged by con
necting members 30 and 31 in such a manner that ?uid
?owing into the inlet means 25 will split and ?ow through
the member 30 into the conduits 27 and 28 and then
combine in the member 31 to ?ow out of the outlet means
leg of the conductive ?uid pump. The combination of 55 26. The proportion of ?uid ?ow through each of the
?uxes in the unit provides for a gradual change in ?ux
conduits 27 and 28 will depend on the amount of pres—
with a relatively small amount of input power to the con
sure developed in each! of the pumps formed in the pres
trol winding and this change in input ?ux changes the
ent device, as will be presently described.
The branch or conduit 27 is ?attened at 30 so as to
balance of pumping pressure in the two conductive ?uid
conduits. The conductive ?uid conduits are connected 60 form a rectangular cross section that passes through the
in hydraulic parallel ‘and are capable of having a varying
gap 15. The ?attened portion 30 is insulated either by
output depending on the direction and amount of pres
an air gap or a ?xed insulating material from the mag
sure in each of the conduits or output passages.
The
combination of the two hydraulic circuits in parallel al
netic structure in order not to shunt any electrical current
from the device if the hydraulic passage is made up of
lows for a single output that can be varied ‘from a maxi 65 a high resistance metal, as opposed to being made up of an
mum with the two in parallel to a minimum when the two
insulating material, as is done in some pumps. The ?at
are operated to form a series circuit wherein the ?uid is
tened portion 30 has two electrodes 29 and 32 joined into
merely circulated around through the pump and is not
the sides of the ?attened portion so as to be capable of
supplied to the outlet of the pump in the conventional
passing an electric current across the portion 30 in the
70 air gap 15 through any conductive ?uid that ?lls the hy
fashion.
It is a primary object of the present invention to dis
draulic circuit or conduit 27. The conductive ?uid most
3,046,893
3
4
commonly used in a material which is a mixture of sodi
um and potassium. The present invention is not limited
to this particular mixture but may be applied to any con
ductive ?uid such as mercury, sodium, potassium, salt
solutions, or even ionized gases. The current path be
tween'electrodes 29 and 32 is at mutually right angles to
pose each other thereby eliminating any ?ux ?ow in the
leg 12.
If the controllable power source 24 is then energized
it would generate a magnetic ?ux in leg 12 that would
the magnetic circuit formed by the leg 13 and the hy
draulic circuit formed by the conduit 27. As is well
as the controllable power source 24 is increased in mag
aid one of the ?uxes 50 or 51 and partially cancel the
other ?ux of 50 or 51. It thus becomes obvious that
nitude that the ?ux in one of the legs 11 and 13 is sub
stantially increased while the ?ux in the remaining leg is
known in the conductive ?uid pump art, the existence of
a magnetic ?eld at right angles to a current will create 10 decreased. Therefore one of the conductive ?uid pumps
27 or 28 has an increasing pressure output while the
a pumping pressure which is mutually perpendicular to
other pump has a decreasing pressure output.
the two generating forces. This hydraulic force will then
If the hydraulic circuit is now considered with the con
move the conductive ?uid along the conduit 27.
trollable power source 24 in an off condition, and the
The electrodes 29 and 32 are connected to a pair of
bus-bars 33 and 34. The bus-bar 33 connects to elec 15 balance of the pump energized, it becomes obvious that
two pumps ‘are provided which are in hydraulic parallel
trode 29 by passing into the magnetic structure of pump
and which are equal in pumping pressure. As such, a
10 and then passing outwardly through conductor 35
?xed pumping pressure will ‘be developed between the
through the gap 15 to electrode 29. The current coming
inlet means 25 and the outlet means 26. By energizing
into bus-bar 33 then passes through the conductive ?uid
the controllable power source 24, one ofthe pumps 27
in the ?attened portion 30 of the conduit 27 to the bus
or 28 is decreased while the other is increased. With two
bar 34. The bus-bars 33 and 34 are connected by con
pumping sources in parallel relationship with one increas
doctors 36 and 37 to a power source 40. It will be ap
ing and the other ‘decreasing, a circulation of ?uid will
preciated that the current ?owing thus passes into the
occur around the channel formed by the legs 27, 28, 30
magnetic structure, through the structure to an electrode,
and back across the magnetic structure so that a com 25 and 31. This circulating hydraulic ?uid then decreases
the total amount of pressure available between the inlet
pensated conductive ?uid pump is provided. The fact
means 25 and the outlet means 26. As the controllable
that the current ?owing in conductors 36 and 37 along
power source 24 is increased in magnitude, the point is
with bus-bars 33 and 34 completely links one leg of the
eventually reached wherein one of the pumps formed in
pump 10 makes it obvious that a magnetic ?ux is gen
erated in the leg 13 of the pump 10. This self-gen 30 legs 11 and '13 becomes completely ineffectual and the
other pump becomes a maximum pumping source. The
erated ?ux interacts with the current that generates it and
provides a pumping pressure in a conventional fashion.
The pump structure passing through leg 11 is identical
to that passing through leg 13 and is made up of bus
complete ineffectual pump forms a hydraulic short cir
cuit in the device and the entire amount of ?uid supplied
to the device circulates around the closed loop and pro
insulated either by air gaps or conventional insulating
material from one another to prevent leakage paths for
the‘?owing current. The bus 41 is connected by con
It thus become apparent that by increasing the power
available from the controllable power source 24, it is
possible to modulate the present device from a maximum
power output to a minimum power output. The modu
bars 41 and 42 which connect to electrodes 43 and 44. 35 vides little or no pumping pressure between the inlet
means ‘25 and the outlet means 26.
The electrode structure and the ?attened conduit 45 are
ductor 46 to the power source 40 while a conductor 47
connects the power source 40 to the bus-bar 42. Once
lating hydraulic ?uid pump that is supplied by the present
device could be readily applied to the hydraulic actuator
again the current ?ow is from within the magnetic struc
disclosed in the Carlson, Jr. et al. Patent No. 2,948,118 to
ture through the leg 11 and then back through the ?at
position the valve shown in that patent in response to the
tened portion 45 of the conduit 28 into the magnetic
structure and back to conductor 46. This again provides 45 degree of energization of the controllable power source 24.
The present pump has been described as operable on
a self-compensated electromagnetic conductive ?uid
direct current and it is obvious that by application of the
pump in leg 11 and the flux for this pump is a self-gen
proper phased alternating current, the present pump
erated ?ux.
would have the same novel characteristics. The single
Operation
50 embodiment disclosed in the present application is illus
trative of the principle of operation and is in no way
In describing the operation of the present device it is
intended as a disclosure of a sole embodiment possible
simplest to consider the unit as a direct current unit so
of the present invention. Since one skilled in the con
that all of the currents and magnetic ?elds are stationary
ductive ?uid pump art could readily convert the present
in space relationship and are in the proper phase rela 55 invention into many embodiments the applicants wish to
tionship for the creation of a pumping pressure. The
be limited in the scope of their invention only by the
power source 40 supplies current to two electromagnetic
appended claims.
conductive ?uid pumps and these pumps have self-gen
erated ?uxes in the legs in which they pass in the overall
We claim as our invention:
1,. An electromagnetic conductive ?uid pump ?lled with
magnetic structure. In each case the direction of cur— 60
a
conductive
?uid: magnetic core means having a plural
rent from the power source 40 is such that the two pumps
ity of legs and two said legs having air gaps therein; ?uid
formed in conduits 27 and 28 pump in the same direc
tion. That is, when the device is energized, pumping
?lled conduit means passing through each of said air
pressures exist in the conduits 27 and 28 which would
gaps; said conduit means having common inlet means and
common outlet means; electrode means including current
cause a ?ow of ?uid from the inlet means 25 to the out
let means 26.
With this particular arrangement of cur
65
source means connected to said conduit means at said air
rent ?ow, the self-generated magnetic ?ux in the legs 11
gaps; said electrode means positioned to pass currents
through said conduit means at said gaps creating a pump
supplied by the controllable power source 24, the self
ing pressure in said conduit means at each air gap by
generated ?uxes 50 and 51 would tend to flow around 70 interaction of said currents and a self-generated ?ux at
the magnetic core in the same direction. In this arrange
each gap; and ?ux generating means associated with said
ment the ?ux 51 would tend to flow down in the center
core means and generating a magnetic control flux in said
and 13 are as shown at 50 and 51.
With no energy
leg 12, while the ?ux 50 would tend to ?ow up in the
legs; said control ?ux combining with said self-generated
same leg from its bottom. These two flux components
?ux to vary the pumping pressures in said conduit means;
generated by the two pumps in the outer legs would op 75 said pressures combining in said conduit means thereby
3,046,893
6
a conductive ?uid: magnetic core means having a plural
4. An electromagnetic conductive ?uid pump ?lled with
a conductive ?uid: a'magnetic core having three legs and
two said legs having air gaps therein; a ?uid ?lled conduit
passing through each of said air gaps; said conduits having
ity of legs and ‘two said legs having air gaps therein;
?uid ?lled conduit means passing through each of said
a common inlet and a common outlet; electrodes includ
ing current source means connected to said conduits at
air gaps; said conduit means having common inlet means
and common outlet means; electrode means including
said air gaps; said electrodes positioned to pass currents
through said conduits at said gaps creating a pumping
pressure in each said conduit by interaction of said cur
varying the total outlet pressure available from said pump
as said control ?ux varies.
2. An electromagnetic conductive ?uid pump ?lled with
current source means connected to said conduit means
at said air gaps; said electrode means positioned to pass 10 rents and a self-generated ?ux at each gap; and ?ux gen
erating means associated with said third core leg and gen
currents through said conduit means at said gaps so that
erating a magnetic control ?ux in said legs; said control
?ux combining with said self-generated ?ux to vary the
pumping pressures in both said conduits; said pressures
back around said conduit means to a point within said
core thereby creating a pumping pressure in said conduit 15 combining in said conduits thereby varying the total outlet
said currents ?ow from within said core, through said
conduit means and associated conductive ?uid, and then
means at each air gap by interaction of said currents and
a self-generated ?ux at each gap; and ?ux generating
means associated with said core means and generating
pressure available from said pump as said control ?ux
varies.
5. An electromagnetic conductive ?uid pump ?lled with
a conductive ?uid: a magnetic core having three legs and
a magnetic control ?ux in said legs; said control ?ux
combining with said self-generated ?ux to vary the pump 20 two said legs having air gaps therein; a ?uid ?lled conduit
passing through each of said air gaps; said conduits having
ing pressures in said conduit means; said pressures com
a common inlet and a common outlet; electrodes including
bining in said conduit means thereby varying the total
a current source connected to said conduits at said air gaps;
outlet pressure available from said pump as said control
said electrodes positioned to pass currents through said
?ux varies.
3. An electromagnetic conductive ?uid pump ?lled 25 conduits at said gaps so that said currents ?ow from with
in said core, through said conduits and associated conduc
with a conductive ?uid: a magnetic core having three legs
tive ?uid, and then back around said conduits to a point
and two said legs having air gaps therein; a ?uid ?lled
within said core thereby creating a pumping pressure in
conduit passing through each of said air gaps; said con
each said conduit by interaction of said currents and a
duits having common inlet means and common outlet
self-generated ?ux at each gap; ?ux generating means in
means; electrode means including current source means
cluding a winding and a controllable power source; and
connected to said conduits at said air gaps; said electrode
said winding encircling said third core leg and generating
means positioned to pass currents through said conduits
a magnetic control ?ux in said legs in response to said
at said gaps so that said currents ?ow from within said
power source; said control ?ux combining with said self~
core, through said conduits and associated conductive
?uid, and then back around said conduits to a point within 35 generated ?ux to vary the pumping pressures in both said
conduits; said pressures being capable of causing said
said core thereby creating a pumping pressure in each
conductive ?uid to partially recirculate in said conduits,
said conduit by interaction of ‘said currents ‘and a self
said inlet and said outlet thereby varying the total outlet
generated ?ux at each gap; and ?ux generating means
pressure available from said pump as said control ?ux
associated with said third core leg and generating a mag
netic control ?ux in said legs; said control ?ux combining
varies.
with said self-generated ?ux to vary the pumping pres
References Cited in the ?le of this patent
sures in both said conduits; said pressures being capable
of causing said conductive ?uid to partially recirculate in
UNITED STATES PATENTS
said conduits, said inlet means, and said outlet means
thereby varying the total outlet pressure available from 4
said pump as said control ?ux varies.
1,961,350
2,686,474
Grunsky ____. _______ __i__ June 5, 1934
Pulley _______________ __ Aug. 17, 1954
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