U.S. patent number 3,574,485 [Application Number 04/710,108] was granted by the patent office on 1971-04-13 for method and apparatus for movement of liquids by electromagnetic means.
This patent grant is currently assigned to Joseph A. Broido, Louis Broido. Invention is credited to Harry H. Herman, Jr.
United States Patent |
3,574,485 |
Herman, Jr |
April 13, 1971 |
METHOD AND APPARATUS FOR MOVEMENT OF LIQUIDS BY ELECTROMAGNETIC
MEANS
Abstract
Apparatus for effecting selectively directed motion of contained
conducting fluids by selective application of electromagnetic force
fields thereto.
Inventors: |
Herman, Jr; Harry H.
(Washington, DC) |
Assignee: |
Broido; Louis (New York,
NY)
Broido; Joseph A. (New York, NY)
|
Family
ID: |
27384390 |
Appl.
No.: |
04/710,108 |
Filed: |
March 4, 1968 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
776884 |
Nov 28, 1958 |
3371541 |
Mar 5, 1968 |
|
|
Current U.S.
Class: |
417/50 |
Current CPC
Class: |
H05B
6/34 (20130101); H02K 44/04 (20130101); B65G
53/56 (20130101); B01F 13/0809 (20130101); H02K
44/06 (20130101); B22D 27/02 (20130101); H05H
1/40 (20130101); B01F 2215/0075 (20130101) |
Current International
Class: |
B01F
13/08 (20060101); B01F 13/00 (20060101); H02K
44/00 (20060101); B22D 27/02 (20060101); H02K
44/06 (20060101); H02K 44/04 (20060101); B65G
53/34 (20060101); B65G 53/56 (20060101); H05H
1/26 (20060101); H05H 1/40 (20060101); H05B
6/02 (20060101); H05B 6/34 (20060101); H02k
045/00 () |
Field of
Search: |
;310/172,11 ;103/1
;230/1 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Freeh; William L.
Parent Case Text
This application is a division of my copending application Ser. No.
776,884 filed Nov. 28, 1958, now U.S. Pat. No. 3,371,541.
Claims
I claim:
1. Apparatus for effecting a selectively directed flow of
electrically conducting fluid comprising:
elongate conduit means of substantially circular cross section
adapted to contain said conducting fluid,
means for establishing a rotating magnetic field transverse to the
longitudinal axis of said conduit to rotatably displace said fluid
therewithin,
means for applying a selectively directed Lorentz force to said
confined fluid to effect a directional rectilinear displacement
thereof, and
a helically shaped wall member protruding from the inner surface of
said conduit for converting said electromagnetically induced
rotative displacement into selective rectilinear displacement
supplementing that induced by said Lorentz force.
2. Apparatus for effecting a selectively directed flow of
electrically conducting fluid comprising:
elongate conduit means of substantially circular cross section
adapted to contain said conducting fluid,
means for establishing a rotating magnetic field transverse to the
longitudinal axis of said conduit to rotatably displace said fluid
therewithin,
means for applying a selectively directed Lorentz force to said
confined fluid to effect a directional rectilinear displacement
thereof, and
means disposed within said conduit for converting said
electromagnetically induced rotative displacement into selective
rectilinear displacement supplementing that induced by said Lorentz
force.
3. Apparatus as set forth in claim 2 wherein said last mentioned
means comprises:
wall means protruding from the inner surface of said conduit.
4. Apparatus as set forth in claim 2 including aperture means
disposed at a predetermined location in the wall of said conduit
for effecting the delivery of moving fluid therefrom.
Description
This invention is concerned with the movement of liquids by
electromagnetic means and more specifically relates to the
application of the movement of liquids by electromagnetic means.
Reference herein to liquids should be understood to include fluids,
generally such as gases and vapors. By the proper adjustments of
temperature and pressure, materials may be handled as liquids or
vapors or gases. Fluidized solids are also contemplated within the
scope of the term liquid.
In the handling of liquids which are extremely corrosive or are at
greatly elevated temperatures or liquids which are radioactive in
nature, the problem of transferring the liquids from one container
to another and of agitating liquids has been a difficult problem.
In order to move such liquids from one container to another,
pumping means and valve means have been necessary. Each of such
means have required moving parts in contact with the corrosive,
extremely hot or otherwise destructive liquids, and great
difficulties have been experienced. Also where it has been
necessary to agitate or stir the liquids, difficulty has been
encountered in effecting such agitation and stirring because of the
corrosive and other destructive effects of such liquids on any
agitators fixed in the vessels containing the liquid or introduced
into the liquid for the purpose of such agitation.
Furthermore, in the treatment of other liquids which must be
treated under pressure or for other reasons must be sealed from the
atmosphere because of the nature of the treatment or of the liquid
to prevent contamination of the liquid or contamination of the
atmosphere, the handling of such liquids in sealed containers and
the treatment thereof has been greatly complicated by the necessity
of actuating the liquid in the sealed containers.
Frequently where liquids of a dangerous or corrosive nature require
treatment by agitation, it has not been possible or practical to
permit movement of the container thereby effecting a degree of
agitation of the contained liquid.
It is an object of this invention to provide a means of moving or
otherwise agitating liquids in containers without movement of the
containers or without contact with the liquids whereby liquids of
destructive and corrosive qualities may be safely handled.
In addition, in the field of gyroscopes and devices which make use
of the gyroscopic principle, difficulty has been encountered in
freeing the gyrorotor from the mechanical limitations attendant
upon rotating a member by mechanical means and allowing it to
continue its rotation in the same horizon.
It is an object of this invention to provide a means of effectively
rotating a body of liquid for gyro applications wherein the liquid
freely rotates unfettered by mechanical rotational limitations. A
still further object of the invention is to provide means whereby
liquids may be handled by controlling their movement from outside
of the container and directing their movement by the shape of the
container.
Other objects and advantages of the invention will be understood
from the following description thereof.
The invention broadly comprises imparting movement to liquid by
electromagnetic force and more specifically comprises imparting
movement to an electrically conductive fluid or fluid containing
electrically conductive material in an electromagnetic field, the
electromagnetic force being used as a motive force to move the
liquid confined in a container in a field of the electromagnetic
force. In one of its simplest forms the invention can be said to
comprise supporting a body of liquid in a container which is in an
electromagnetic field and causing the movement of the liquid by
applying an electromagnetic force to the body of the liquid. By
varying the shape of the container and by controlling the
electromagnetic force, the various objects and advantages of this
invention can be achieved.
For a more complete description of the invention reference is made
to the drawings, wherein:
FIG. 1 is a schematic perspective view illustrating a simple form
of apparatus embodying the invention wherein the liquid is
contained in a cylindrical container and the electromagnetic force
is applied by an electromagnetic induction stator adapted to induce
a rotating magnetic field;
FIG. 2 is a schematic perspective view of another form of apparatus
embodying the invention in which a toroid containing liquid is
mounted in gimbals, so that the liquid contained in the toroid may
be used as a rotor, the rotational motion being imparted to the
liquid by induction coils creating a rotating magnetic field;
FIG. 3 is a schematic perspective view of another form of apparatus
embodying the invention wherein the container for the liquid is a
sphere which may also be adapted for use as a gyroscope, rotational
motion being induced in the liquid contained in the sphere by
induction coils on the outer surface;
FIG. 3a is a schematic perspective view of apparatus similar to
FIG. 3 but showing the provision of a plurality of sets of coils on
the periphery of the sphere and relay sensing means to selectively
energize the respective sets of coils responsive to tilt of the
sphere;
FIG. 4 is a schematic perspective view of a still further form of
apparatus embodying the invention wherein the liquid is contained
in a cylindrical pipe which is provided with an internal helix and
movement is induced in the liquid by induction coils, on the outer
surface of the pipe, to induce a rotating magnetic field;
FIG. 5 shows a device similar to the form of invention shown in
FIG. 1 with a cylindrical container having inlet and outlet pipes
as indicated.
FIG. 6 is a schematic perspective view of another form of apparatus
embodying the invention in which liquid is confined in a toroid and
a rotational motion is imparted to the liquid by imposing upon the
liquid a unidirectional electromagnetic force;
FIG. 6d is a cross-sectional view of the apparatus of FIG. 6 taken
along the lines 6-6 to show interior detail;
FIG. 7 is a still further form of apparatus embodying the invention
wherein the liquid is contained in a toroid and is subjected to two
types of magnetic forces, one of the unidirectional type
illustrated in FIGS. 6 and 6a and the other the rotating induced
magnetic force illustrated in FIG. 2, the two types of forces being
combined to rotate the liquid;
FIG. 8 is a further embodiment of the invention wherein is combined
both the unidirectional and the rotating induced magnetic forces to
raise liquid in a container. As illustrated, the container is
provided with internal means to mechanically assist in the raising
of the liquid.
The invention, as embodied in the form shown in FIG. 1, comprises a
means for inducing a rotating electromagnetic field which means is
designated 10. This may be in the form of a stator similar to that
used for an induction motor and may be made up of laminated metal
plates 11 and have a suitable coil or winding 12 having lines 13
and 14 for connection to suitable AC voltage source. Shaded poles,
such as brass bars 9 positioned in drill holes in the laminated
plates 11, are provided to create unbalance to produce a rotating
magnetic force field. A container 15 may be disposed in the opening
16, defined by the stator 10, so that it is in the field of
rotating magnetic force.
A liquid 17 to be rotated may be confined in the container or
poured therein after the container has been positioned in the
opening 16.
It has been found that the liquid should be electrically conductive
in order to be satisfactorily rotated in the container, however, in
the case of liquids which are not electrically conductive, a
readily separable electrically conductive liquid can be combined
with the liquid to be rotated so that rotation may be achieved of
the nonconductive liquid. Certain alkali metals have been found
favorable for this purpose. Another means of rotating a
nonconductive liquid is to disperse electrically conductive solid
particles through the nonconductive liquid. Such particles will be
caused to rotate and cause the nonconductive liquid to rotate with
them.
Upon application of alternating current to the coil 12, the
conductive liquid or the nonconductive liquid which has been
combined with conductive liquid or conductive solids at first
develops small eddies at various parts of its body and slowly the
entire body of the liquid starts rotating about the axis of the
container. If a physical axis is placed in the container or if the
container has a physical axis located therein, it has been found
that the liquid will begin to rotate more rapidly. However, a
central axis is not necessary for achieving rotation. The speed of
rotation appears to be a function of the frequency and the induced
voltage.
A specific application of the apparatus of FIG. 1 can be for
stirring or the agitation of liquids in sealed containers, such as
various fluid mixtures must be agitated or mixed prior to sale or
use. The extend of the stirring or agitation which can be induced
in a liquid will be appreciated from the fact that a body of
mercury liquid weighting 15 pounds was placed in a container within
a rotating magnetic field using 2,000 watts of electricity. The
mercury was thereby rotated at a sufficient speed to cause a large
vortex in the center of the container and the mercury rose up the
sides of the container. The frequency of the apparatus was 60
cycles per second. It has been determined that if the frequency or
voltage is increased, the speed of rotation will be increased.
It will be understood that the invention is not limited to the
rotation of a metal such as mercury, which is liquid at normal
temperatures and pressures, but may also be used with other metals
in a molten vapor or gaseous state. The invention may also be used
with nonmetallic liquids which are electrically conductive. The
container should usually be of suitable nonconductive material but
satisfactory results may be obtained by the use of containers of
conductive material if the container is electrically insulated from
the coils or plates of the magnetic force inducing device by an air
gap or other nonconductive shield.
The apparatus schematically shown in FIG. 5 illustrates the use of
the invention as a simple form of combined valve and pump wherein
there is an intake line 20 to a cylindrical lifting chamber 21 and
an outline 22 spaced vertically above the inlet line 20. The same
type of electromagnetically inducing means may be used, as shown in
FIG. 1, that is, an induction coil 12 with laminated plates 11
defining the stator 10 to induce a rotating magnetic force to
rotate the liquid in the container when alternating current is
applied to the coil 12. To use the apparatus shown in FIG. 5 as a
pump and valve, the inlet pipe 20 may be connected to a vessel 24
so that liquid in such position flows through the line 20 to a
level 23 in the cylindrical lifting chamber 21. The liquid in the
lifting chamber 21, when subjected to a rotating magnetic force, is
caused to rotate and form a vortex. The liquid adjacent the inside
walls of the chamber 21 rises up the walls and flows out through
the outlet pipe 22 into another container 25 or to some other
discharge point.
It will be understood that such design features, as providing a
tangential scoop 26, may be provided to improve delivery through
outlet opening 22. Also, the walls of the lifting chamber 21 may be
suitably shaped to aid in raising the liquid, e.g., a helix may be
formed on the walls for guiding the liquid upward
It will be noted from the foregoing description of the apparatus
shown in FIG. 5 that an effective pump and valve means can be
obtained from use of the apparatus and that no moving parts are
required to pump, i.e., raise the liquid, from the level 23 in the
lifting chamber 21 out through the outlet line 22 and that as a
pump and valve arrangement, which effectively prevents flow when
the magnetic force ceases, would be highly desirable for use in the
handling of corrosive or otherwise dangerous and destructive
liquids. For the purpose of illustration, the upper end of the
container 21 has been left open. However, in an actual application
such opening might well be closed if the liquid was corrosive or
otherwise noxious or if the liquid was being treated under other
than atmospheric conditions. The true versatility of the device
will be understood when it is appreciated that the device may be
operated with the top open for inspection and sampling or sealed
against contamination.
FIGS. 2 and 3 illustrate two forms or embodiments of the invention
wherein the liquid is held in containers having circular paths for
guiding the liquid. In FIG. 2 the container is a toroid or annulus
30 which is mounted in universal gimbals 31 and 32 to permit the
toroid to be positioned in any horizon which it seeks to maintain.
Induction coils 33 are inducing a rotating magnetic field in the
toroid 30 are positioned on the exterior of the toroid and, as
shown, are actually laid directly on the surface of the toroid. The
coils 33 may be arranged in multiple poles which may be connected
together by lines 34. As previously noted, the rotational speed is
a function of the voltage and frequency. The rotational speed may
also be varied by the number of poles or pairs of coils provided.
FIG. 2 illustrates a six-pole arrangement. Alternating current
voltage applied to the coils produces a rotating magnetic field
whereby liquid in the toroid is caused to rotate at a speed
determined by the input and the number of poles. For purposes of
using the apparatus of FIGS. 2 for a gyroscope, it has been found
effective to use mercury in the toroid because of its mass and
favorable electrical qualities. The toroid, itself, may be made of
glass, ceramic, or other suitable nonconducting material. The
mercury or other fluid may substantially fill the toroid with only
sufficient space left to allow for expansion of the fluid.
FIG. 3 shows another form of gyroscope which embodies the
invention. In this form, a sphere 40 may be supported on any
suitable base 41. A small body of mercury or other suitable
electrically conductive liquid is sealed in the sphere and
induction coils 43 are laid upon the exterior surface of the sphere
in a broad band in the area in which the liquid will rotate. The
coils are attached to a suitable source of AC voltage and the
liquid is caused to rotate. Upon rotation the liquid tends to form
a narrow path about the equator of the sphere in the plane in which
it is first induced to rotate. If the base of the sphere moves into
a new plane, the path of rotating liquid in the sphere will tend to
continue to rotate in its original plane of rotation and thereby
may be used for the purpose of a gyroscope. By providing coils 43
in a broad area of the sphere, this spherical type of gyroscope may
be used in gyroscopic applications wherein the movement from the
original horizon lies within the rotating magnetic field set up by
the coils. The angles of operation of the spherical gyro may be
increased by providing additional coils, as for example the sets of
coils 43a and 43b shown in FIG. 3a, on the spherical surface and
providing suitable means, as for example relay 48a, for creating
magnetic fields by said additional coils.
The fluid ring in the spherical gyro is completely free to remain
always in its initial rotating plane. The coils are so mounted that
the liquid will rotate in the proper direction and speed regardless
of the sphere's position. Pairs of electrical contacts 45 are
distributed about the interior wall of the sphere and extend
through the wall of the sphere to the exterior. They are mounted so
as to make electrical contact with the rotating liquid in the
sphere. The electrical contacts will indicate the angle to which
the sphere has moved with respect to the original plane of rotation
when a circuit is completed between two contacts. For example,
contacts 45a and 45b are on diametrically opposite sides of the
sphere, are connected to a suitable sensing mechanism when the
conducting fluid which is rotating within the sphere makes contact
by rotating in an equator which passes into contact with both
contact points 45a and 45b. The sensing circuit is completed by the
conductive liquid. For purposes of illustration, lines 46 and 47
lead to the sensing mechanism which may be a simple light, relay or
directional indicator which is illustrated merely as a coil 48 in
the diagram shown in FIG. 3. In line 46 a source of power such as
battery 49 is provided.
These same electrical contacts can be used to activate different
sets of coils 43 which are mounted on the surface of the sphere to
keep the electromagnetic force bound within the initial plane of
rotation. Thus, for example, in FIG. 3a the pair of coils 43 is
energized from the AC source indicated through lines 100, 101, and
102 connected in series with normally closed contacts 103 and 104
of relay 48a and through return line 105. When the sphere is tilted
such that the rotating fluid connects electrical contacts 45a and
45b relay coil 106 is energized to open contact 103 and close
contact 107 thereby deenergizing coils 43 and energizing coils 43a
and 43b which lie in the diametrical plane of contacts 45a and 45b.
When the sphere is tilted the opposite way to cause the rotating
fluid to connect electrical contacts 45c and 45d relay coil 108 is
energized to open contacts 104 and close contacts 109 thereby
deenergizing coils 43 and energizing coils 43b which are in the
diametrical plane of contacts 45c and 45d. It is understood that
the number of coils used and the arrangement of the contacts 45 are
made suitable to the intended purpose of selectively energizing
coils as required to continue a rotating field for the fluid as the
sphere is tilted.
It will be noted that by the use of a liquid such as mercury within
the toroid type of gyro shown in FIG. 2 or the spherical type shown
in FIG. 3, that the usual difficult problem of obtaining a dynamic
balance is eliminated because the liquid is by its nature
self-distributing and self-balancing.
It will also be understood that there are no bearing required to
support the rotor. The liquid is supported in the container and
another fluid, if desirable, can be used as a lubricant between the
rotating fluid and the inner surface of the container to decrease
any frictional losses.
By virtue of these designs, FIGS. 2 and 3, all of the motion is
contained within a sealed element which will eliminate many
environmental problems encountered in the use of gyroscope
apparatus in missiles, aircraft, and nautical applications.
The embodiment shown in FIG. 3 illustrates particularly the
usefulness of the invention for a gyroscope in that all bearings
needed for the usual gimbals shown in FIG. 2 have been
eliminated.
It will also be appreciated that a gyro made in the form shown in
FIG. 3, which may be completely sealed and in which all exterior
moving parts have been eliminated, can be readily miniaturized for
missile applications and for other uses in guidance systems where
it is particularly desired to reduce space and weight
requirements.
In FIG. 4 a further embodiment of the invention is disclosed
wherein a cylindrical conduit 50 of nonconducting material adapted
to contain an electrically conductive liquid which is to be moved
therethrough is provided with an interior screw thread or spiral
51. On the exterior of the cylindrical conduit 50 coil means 52 are
positioned to induce a rotating magnetic field within the conduit
50. Upon applying an alternating current to the coils 52 liquid is
made to rotate in the conduit 51 and the screw thread on the
interior of the conduit 50 causes the liquid which is contained in
the conduit to advance in the direction of the arrows indicated in
FIG. 4. The lead or pitch of the threads of screw may be changed to
change the speed at which the liquid will be moved axially in the
conduit. The mechanical advantage increases with a decrease in the
pitch or lead. The rotational speed of the liquid is also a factor
in determining the speed of axial movement of the fluid through the
conduit. The apparatus of FIG. 4 forms essentially a pump. It has
the advantage of being usable in either direction by reversing the
rotating magnetic field. The liquid may be caused to rotate in the
reverse direction and the liquid will be therefore caused to spiral
and move in the opposite direction to the arrow shown in FIG. 4.
Furthermore, there are no moving parts required for such a
pump.
Referring to FIG. 6 the apparatus shown is a toroid 70 or other
convenient suitable container which, for purposes of illustration,
may be used as a rotor having suitable supporting spokes or other
supporting means 71 to support the rotor on its axis 72. The toroid
70 is filled with suitable electrically conducting liquids and the
toroid itself is made of suitable nonconducting material. In the
cutaway portion of FIG 6 it will be noted that on the interior wall
of the toroid is provided fins or blades 73 which may be fixed to
the walls of the toroid either on the larger or smaller diameters
depending upon the use to be made of the rotor. In the form shown
in FIG. 6 the electromagnetic force imposed on the liquid is that
known as the Lorentz force which results in a force to move a
conducting fluid in a direction normal respectively to a direct
current flow and to an applied magnetic force.
In FIGS. 6 and 6A several coils 74 are fixed to the exterior of the
toroid 70. These coils are adapted to carry direct current and for
that purpose are connected to suitable DC sources. The coils 74
produce a magnetic force of fixed polarity acting upon the fluid in
the toroid. These coils may also be replaced by permanent magnets.
Associated with each coil 74 are the contact elements 75--76 which
extent through the wall of the toroid to make electrical contact
with the liquid contained in the toroid. The contacts 75 and 76 are
connected to a suitable source of direct current which provides a
current flow as indicated by the arrows. As a result of the
magnetic force of fixed polarity and the flow of current via the
electrically conducting fluid between the points 75 and 76, the
electrically conducting fluid will be moved in a direction at right
angles to the flow of the current between 75 and 76 and at right
angles to the polarity of the coils which for the purpose of
illustration, is indicated at each coil in the diagram in FIG. 6 as
well as in FIG. 6d. Arrows have been placed in FIG. 6 and FIG. 6A
to indicate the flow of the liquid in the container 70 which in
FIG. 6 is counterclockwise. It will be understood that by placing
the liquid in a curved toroidal chamber and that by placing
magnetic coils 74 and electrical contacts 75 and 76 at points
around the toroid, that the unidirectional movement caused by the
Lorentz force induced at each device around the toroid results in a
combined movement of liquid which is rotational in nature. To
obtain the most desirable results and to achieve what is known as a
coupling force, each coil 74 with its related contacts 75 and 76
should be placed in diametrically opposed relationship around the
toroid, which, for the purpose of acting as a rotor, should be
substantially circular. In this particular application in which the
toroid is used as a rotor, it may be accelerated and decelerated by
the amount of current imposed through the coils 74 and the current
contact points 75 and 76. Electrical connections may be made and
maintained through suitable brush contacts to the several coils 74
and contacts 75 and 76.
By controlling the viscosity of the liquid, the speed and
mechanical advantage of the system may be controlled, Heat may be
one means of changing the viscosity of the fluid during operation
of the device.
It will be understood that the Lorentz force can be used in the
other types of applications for achieving rotation as in FIGS. 1
through 4, and also it will be understood that the use of a
rotating container as a turbine rotor, as illustrated in FIG. 6,
may be rotated by means of the rotating electromagnetic force in
connection with the illustration in FIGS. 1 through 4.
FIG. 7 illustrates a toroidal container 80 which is provided with
an electrically conducting fluid.
Coils 81 for inducing a rotating magnetic field in the fluid are
linked by lines 82 to form a six-pole arrangement similar to that
described in FIG. 2. The coils 81 induce a rotational motion in the
liquid contained in the toroidal element 80 when alternating
current is applied through the lines 83 and 84. Also arranged on
the exterior of the toroid so as to apply a Lorentz force at
various locations around the toroidal container 80 are DC coils 85
to produce a fixed polarity magnetic field, and associated contact
points 86 and 87 for directing a current through the toroidal
container in the same manner as described with regard to the
apparatus in FIGS. 6 and 6a. It will be understood that by applying
the rotating magnetic force and the unidirectional force at various
locations around the toroidal container that the liquid is caused
to rotate by both electromagnetic forces.
This is an example in which both of the foregoing electromagnetic
forces are utilized to cause rotation of the liquid. This is a
method of advantage where great velocities or masses of fluid have
to be rotated. For purposes of illustration, FIG. 7 is shown as a
gyroscope rotor mounted in gimbals as in FIG. 2. The combined
method shown in FIG. 7 for causing rotation is of advantage during
the initial starting of the fluid in motion and one of the two
methods may be switched off after a fluid has reached its desired
velocity. The decreased load at that time may be handled by either
of the two methods shown. The provision of the two means of
rotating the liquid may also be incorporated for safety purposes
where it is necessary to have a secondary means to rotate the fluid
in the event of breakdown of one of the methods, such as an
alternating current failure having standby direct current batteries
which would produce the Lorentz force.
FIG. 8 is a nonconducting pipe element 90 on the surface of which
are mounted permanent magnets 91, and containing two contact
elements 93 and 94 mounted upon the inner surface of the pipe 90.
Upon application of direct current to the contact elements 93 and
94, current will flow from 93 to 94 through the conducting fluid
contained within the nonconducting pipe 90. This current flow will
cause a Lorentz force resulting in motion in the upward direction,
as shown in FIG. 8. If at the same time an alternating current is
applied to coils 92 creating a rotating magnetic field in the same
manner as described for example in FIG. 1, the induced
electromotive force causes the fluid to rotate circularly within
the pipe element. The resultant motion of the fluid acted upon by
the two forces will be spiralling upward movement. It will be
appreciated that the use of these combined forces may be utilized
as a pump or valve or in other applications in which it is
necessary or desirable to raise and/or rotate fluids. The shape of
the walls of the container may be designed as suggested in FIG. 4,
to provide suitable mechanical advantage.
It will be appreciated that the lifting force exerted by the
permanent magnet (which may be an electromagnet of fixed polarity)
may be applied usefully in an apparatus such as the spherical gyro
of FIG. 3 to initially lift the liquid into its rotational
equatorial path.
It will also be understood that this invention can be employed in
certain centrifugal applications because the rotational speeds can
be readily controlled and raised and lowered and the direction of
rotation can be changed readily. The invention may be applied for
the treatment of molten metals as well as other electrically
conductive materials at high temperatures as well as very low
temperatures. The application of the invention for the handling of
molten metals and for the centrifugal casting of such metals will
be well appreciated. It will be understood that by moving liquids
axially in containers such as cylinders, it can be made to operate
pistons or other physical means disposed in the path of the moving
liquid.
Also, if electrical contacts are placed in a container above the
liquid level and the liquid is caused to rotate and rise to the
contact, a suitable switch means may be had. The foregoing are
merely to indicate the various means to which the applicant's
invention can be applied. The description has sought to suggest
that certain of the applications are to indicate certain presently
preferred forms of applying the invention but it will be
appreciated that the invention can be carried out by other means
and may be used to accomplish the various operations within the
scope of this invention.
The scope of the invention is defined in the following claims:
* * * * *