US2927537A - Magnetically actuated pump - Google Patents

Description

March 8, 1960 M. w. HUNTER 2,927,537

MAGNETICALLY ACTUATED PUMP Filed July 22, 1957 7 Sheets-Sheet 1 IN V EN TOR.

Melmork W Hunrer AHorney March 8, 1960 w, HUNTER 2,927,537

MAGNETICALLY ACTUATED PUMP Filed July 22, 1957 7 Sheets-Sheet 2 INVENTOR. Melmofh W Hunfer BY AH'orney March 8, 1960 HUNTER 2,927,537

MAGNETICALLY ACTUATED PUMP Filed July 22, 1957 7 Sheets-Sheet 4 M. W. HUNTER IAGNETICALLY ACTUATED PUMP March 8, 1960 Filed July 22, 1957 7 Sheets-Sheet 5 IN V EN TOR.

Melmofh W HunTer March 8, 1960 M. w. HUNTER 2,927,537

MAGNETICALLY ACTUATED PUMP Filed July 22, 1957 7 Sheets-Sheet 6 INVENTOR. Melmoih W Hun'l'er BY Nforney March a, 1960 NTER 2,921,537

MAGNETICALLY ACTUATED PUMP Filed July 22, 1957 7 Sheets-Sheet 7 INVENTOR. MelmoHw W Hun+er AH'orney United StatesPatent 6 2,927,531 MAGNETICALLY ACTUATED PUMP Melmoth W. Hunter, Lorain, Ohio Application July 22,1957, Serial No. 673,285 I zrc aims. or. 193-118) This v invention" relates to pumps, and in particular relates to a magnetically actuated pump forpumping fluids. Y

The present invention is an improvementover prior Melmoth W. Hunter patents, Nos. 2,033,577 and 2,788,747. 7

One object of the presentinvention is to provide an improved magnetic pump unit which is separably attached to a pump housing, as in the aforesaid Patent No. 2,788,747, but wherein-improved means is provided for quickly detachably-securing the pump unit on the housing in any one of ian infi nite number of rotatably adjusted positions,- through 360 degrees, with respect to a longitudinal axis of the pump, and thereby makingit possible to mount the pump unit on the housing with an outlet conduit orlike'priotr usion extending radially therefrom to avoid obstructions near the pump.

Another object of the invention is to provide a pump unitof the characterdescribed having a revolving magnetic attraction device'in the housing, utilized in known manner for tippinga wobbler disc within the pump chamber in continuous circumferential progression, including improved, magnetic circuit means from said mag-v netic attraction device through said pump unitand wobbler disc, and by which loss of magnetic flux in the system is reduced to a. minimum.

Another object of the invention is to provide a pump unit of the character described having improved means for self-centeringly mounting the wobbler disc therein for said continuous tipping action of the disc, said selfcentering means being such that'the disc isreversible and hence may be mounted in the pump chamber with either side presented inwardly thereof, toward said magnetic attraction device. 7

Another object of the invention is to provide a pump of the character described having improved magnetic attraction means, including a rotor extension provided with counter-balanced portions of magnetic and nonmagnetic'materials, and presentinga solid body through an opening in the wallet the housing, toward cooperaticn with the pump unit, without protrusions which could cause injury while the pump is being cleaned or repaired, and' which makes possible the provisionof an efiective ilui d seal between said solid body and the edge portions ofthe op ening through which it extends, which in turn prevents passage of oil, dirt, or foreign matter in either direction through said housing opening.

Another objectof the; invention is to provide a pump unit of the character described, including between said rotor extension or body and said disc a relatively thin wall or diaphragm having the characteristic of passing magnetic fiuxtlierethrough; and wherein improved means is providedforsupporting said-thin wall against fiuid pressure. produced withinthe pump. which might otherwise deform the wall,-whereby is; made possible-the production of pumps of substantially unlimited capacity,

without necessarily increasing thethickness of said thin "ice Another object oflthfeinventionlis to provide improvements in wobbler discs for pumps of the, character described, which, eliminate or effectively reduce eddy currents in the magnetic fiux passed through the discs which otherwise would producefelectrical currents capable of counteracting 'the established magnetic. field in the pump-actuating system, I I I, II n These and other objects of the invention will be. manifest from the following brief description; and the. accompanying drawings.

0f the accompanying drawings; I k I Figure 1 is a top plan view of, a .magnetic..pump embodying the features ,oftheinventionn II I I I Figure 2 is an end elevationthereof, asviewed, from the right of Figure 1.v I I v u Figure 3 is an enlarged fragmentary' vertical cross-' section of the pump, taken substantially'on the linej3- -3 ofFigurel.

Figure 4 is an. endview of tthe pump unit casin'gin the relative positio'nshown in Figure 2, but. removed from the pump housing, and with an end closure cap and wobbler disc removed fromthe'casing. I

Figure 5 is avert-icalIcross-section taken substantially on the line 5 -5 of Figure 3, b uton a reduced scale, and illustrating theinterior of ,the pump chamber. with the wobbler disc remoyed.v

Figure 6* is a, similar vertical: cross-section, taken substantially on the line 66 of Figure,3,, but withmthe pump unit removed to show an exposed end of ,a mag-. netic rotor extensiomand illustrating improved sealing means provided between thesame'and an opening to the pump housing. V I I I I Figure 7 is a viewv correspondingYto Figure 3, illustrating a modified for infofima gnetic pump, including, improved means for self-centeringly"mounting thewobbler disc in the pump chamber by, which, the wobbler disc is reversible without affecting the. self-centering operationof the same. I v c I I Figure 8 is an edge view, partly broken away, and in section, of the wobbler disc illustrated in Figures 3 and7, but in greater detail to illustrate 'means for preventing the creation of eddy currentsmagnetidflux within the wobbler disc during operationot tlie pump n I Figure 9 is. anedgeview corresponding to Figure 8 illustrating another structure for elimiuatingsaid .eddy currents. I f

Figure 10 is a' viewsubstantiallycorrespondingto Figures 8 and 9,'but illustrating still another form of disc designed to obviate creation of eddy currents.

Figure 11 is a top plan view, partly broken in section, of the wobbler disc shown in-Figure 10;

Figure 12 is a fragmentary cross-section" of still another modified form of the invention, which is in part like that shown in Figure 9.

Figure 13 is a fragmentary cross-section, corresponding to a portion of Figure Brillusttating another modified form of the invention particularly relating to the pump unit.

Figure 14 is-a plan view of the wobbler disc shown in Figure 13, but removed from the pump unit.

' GENERAL DESCRIPTION,

Referring particularly-to Figures 1 to 6, thenumeral 15 designatesgenerally a ymagueticpump, including an.

electric :motor 16 mountedon a supportingfbasef17;, a magnetic attraction unit 18, suitably removablygattached mecha i m 21.,

Magnetic attraction unit The magnetic attraction unit 18 includes a cylindrical hollow housing 22 removably secured on the motor 16 (see Figure 3), and having peripheral, inner, and outer walls 23, 24 and 25, respectively, said housing having therein an elongated rotor sleeve 26 of magnetic material which is affixed or keyed on an extension 27 of a driven shaft 28 of motor 16, to rotate therewith about a longitudinal axis of the pump. Also, within the housing 22 may be aflixed an annular magnetic coil 29 of known type adapted, when energized, to set up a magnetic held through rotor sleeve 26, and otherwise in a manner to be described later.

n the outer end of sleeve 26 axially thereof may be a solid disc-like head or enlarged body 3% which is a composite of two segments made of magnetic and nonmagnetic materials respectively, integrally united in known manner, said rotor head having an axially, outwardly presented annular surface portion 31, defining a frustum of a cone. The peripheral edge 32 of the rotor head 30 may be cylindrical, as for fluid and dirt sealing frictional engagement with an annular gasket 33 of rubber-like resilient material, cemented or otherwise affixed within an opening 34 in housing wall 25, through which opening a portion of the rotor head 30 protrudes to have at least said annular conical surface 31 free and unobstructed, as shown in Figure 3. A magnetic portion 35 of the rotor head 30 constitutes a relatively small segment thereof, and may be an integral angular extension of the magnetic material of sleeve 26, said extension or segment 35 terminating in a substantial surface area, indicated at 36 in Figure 6, which is radially offset with respect to the axis of the rotor shaft 27. The non-magnetic segment 37 of the rotor head, together with integral non-magnetic extensions 38 thereof surrounding segment 35, counter-balance the head somewhat in the manner of a flywheel for smooth rotation of the rotor by motor 16.

It should be noted that when the pump unit is removed from the rotor housing 22, as shown in Figure 6, only smooth surface portions of rotor head 30 are exposed, rather than protruding parts which might prove dangerous "while rotating.

Magnetic pump unit Pump unit 20 may include a hollow casing 19 having a one-piece cup-shaped body 39 of relatively nonmagnetic material, including a cylindrical peripheral wall 40 and a relatively thin, outwardly dished inner wall or diaphragm 41, which presents an annular conical surface 42, of the inner or concave side thereof, in slightly spaced relation to the conical annular face 31 of rotor head 3%, whereby as the rotor head is rotated by motor 16 the exposed magnetized surface area 36 will move in a circular orbit about the axis of the rotor, for purposes to be described. A cap 44 of magnetic material, constituting an outer wall of the pump unit casing 19, may have a reduced inner portion 45 tightly received within the innner surface of peripheral wall 40 defining an annular seat 50, for fluid-retaining engagement with the outer edge of wall 40. The cup-shaped body 39 may have the peripheral wall 40 thereof suitably bonded, as by soldering or brazing methods, within a cylindrical sleeve 46, of magnetic material, said sleeve being extended at 48 beyond the inner edge of peripheral wall 40 for seating in an annular seat 49 in wall of the rotor housing. The outer end of sleeve 46 terminates in a welded extension connecting the same to peripheral wall 40,, and a gasket 51 of rubber or the like provides a fluid seal between the flush edges of peripheral walls 40 and 46 and seat 50.

The reduced portion 45 of cap 44 may have an inwardly convergent frusto-conical surface portion 53 which is axially spaced from the oppositely disposed, outwardly convergent frusto-conical surface portion 54 of the diaphragm 41. At least portions of conical portions;

53 and 54 are simultaneously engagcable by diametrically and axially opposite fiat sides of a relatively thin flat sided Wobbler disc 55 of magnetic material, which will be described in detail later (see Figure 3). The Wobbler disc 55 is of a diameter only slightly less than the inner peripheral surface 56 of the peripheral wall 40, whereby in all positions of the Wobbler disc during operation of pump in a manner which will be described later, the peripheral edge 57 of the disc will be in substantially close conformity with said peripheral wall surface 56, and cannot fall substantially out of axial operational alignment within the pump chamber C. Thus, the wobbler disc will at all times during :operation of the pump divide the pump chamber C into two substantially distinct wedge-shaped pockets at opposite sides of the disc, which communicate with each other substantially only through a central opening 58 of substantial flow area through the disc, to be in substantial alignment with an inlet opening 59 of substantially the same or corresponding flow area through the cap. The opening 59 extends axially through a reduced neck 60 to which may be threaded a suitable coupling device on a conduit (see chain-dotted lines in Figure 3) from a gravity feed or other source of liquid supply, such as milk, oil, sea water, etc. A neck 61 extending radially outwardly from the peripheral wall 4i) and through an opening in the sleeve 46, has an outlet opening 62 therethrough from the pump chamber C, the outer'encl of the neck 61 being threaded for coupling attachment of a conduit (see chaindotted lines in Figure 3).

The aforementioned Patent No. 2,788,747 shows means for self-centering the Wobbler disc at all times during operation of the pump. The means referred to in the patent, however, required provision of protruding guide means on one side of the disc, so that it was possible for the disc to be inserted within the pump chamber with a wrong side presented to complemental guide means on the magnetic diaphragm, thereby 'to result in improper or ineff cient operation of the pump. This difliculty is obviated in the present instance by provision of a disc 55 which has identical flat sides, and of a flat boss 63 of shallow depth on diaphragm 41, within the pump chamber, the diameter of the boss approximating the diameter of the opening 58 in the disc. The boss 63 defines a filleted peripheral shoulder 64 for complemental recep tion of either corner edge portion 65 defined by said central opening of the disc, at points of progressive contact thereof, as best shown in Figure 3. In any event, the progressive contact of the corner portions 65 of the disc with shoulder portion 64 is effective to retain the wobbler disc in self-centered relation during operation of the pump to impart requisite progressive wave-like tilting movement to the disc. i

As will be best understood by reference to Figure 3, frictional contact between the opposite engaging portions of the disc with the corresponding'conical portions of the diaphragm and the cap will be reduced to a minimum if the adjacent surface portions diverge radially outwardly to a slight degree from the respective'progressive points of contact.

In case it is desired to produce pumps of substantially large capacity without substantially increasing the thickness of the diaphragm 41, a suitable frictional thrust bearing 72 may be provided between the end of rotor head 30 and the central portion of the diaphragm.

Pump unit attaching means clockwisedirection (Figure'2), to engage the rods 70 inthe notches 69; A pair of nuts" 71" threaded-on the outer ends of rods 70. are operable against the ends of the. bar 67 to'apply clamping action to the cap 44, and thereby to clamp thepum'p unit in the 'seat portion 49 of wall of the rotor housing, withfa ll parts of the pump casing 39 assembled in fluid-sealing relationship. When his 'desiredto remove the pump unit 20.from

rotor housing 22, as for cleaning purposes, it is only necessary to loosen the nuts 71 and turn the bar 67 in clockwise direction, as shown in Figure 2, to disengage the ends ofj the bar from'the rods 70, whereby the bar is removable from the neck'60 of the cap 44, to release the pump casing'from seatingfpo'sition in the seat49.

The clamping' bar 67, rods 70, and housing 22 are of magnetic metal. Accordingly, in operation'of thepump, the magnetic flux field orcircuit from the coil 29 will be in thedirection of the small arrows-shown in Figure 3, namely, through rotor 26, rotor extension 35, diaphragm 54, wobbler disc 55, cap 44, clamping bar 67, clamp, ing rods 70, and the housing walls back to coil 29. Thus, because the. pump casingv sleeve is ofnon magnetic material, the magnetic flux will not short to the sleeve 46 from the outermost edge portions of the disc relatively as shown in Figure 3, which would tend to reduce 'the efliciency of the pump.

Wobbler disc The wobbler disc 55 may. bemade substantially as shown in Figure 8, or in the manner of modifications thereof shown in Figures 9 to 12, to eliminate or, sub stantially reduce thetendency for eddy currents oimag; netic flux to form within the body of the disc during operation of the pump,.which eddy currents tend to create electrical current which would otherwise ofisetor interfere with the fiowof magnetic flux in the circuit thereof through the magnetic coil 29.

Figure -8 shows the disc 55- asbeing formed of. a thin walled hollow casing ofmagnetic metal, filled with discrete pieces or particles of metal, such as ironor steel shavings, granules, or powder, insulated from each other by dielectric material, such as lacquer, latex plastic, enamel, baked or otherwise hardenedinto a solid agglomerate 1 mass.

Figure 9 illustrates a modified form of Wobbler disc 55a which is of the same shape and proportions as disc 55 but formed of laminations 7474 of magnetic metal, secured together as by means of rivets 73, said laminations being similarlyinsulated from each other, as by means of thin layers of shellac.

Figures 10 and 11 illlustrate still another modified form of Wobbler disc 55b, which is in allrespects like the disc 55 'shownin Figure 8-, except that the hollow casing 65a is filled with a spirally wound tape of thin magnetic metal as indicated at 74b, adjacent surfaces of the tape and the inner surfaces-of the casing being insulated from each other, as before.

Figure 12 illustrates still another modified form of Wobbler, disc c, which is in all respects like the disc 55 of Figure 8, but with thin 'insulated laminations 7411 -7411 of magnetic material as in: Figure 9, encased in a hollow-casing of magnetic material. 1

Operation of pump 6 movementwithoutsubstantial rotation of disc, the disc being maintainedat'i the 'sa'rnerelativeinclination to the axisj'ofthe pump by-enga'gement of axially and diagonally opposite sides of the'discwith corresponding axially and'd iagonallyopposite conical guide surface portions 54 and 53 of 'the'd'iaphra'gm and cap, 41 and 44, respectively. During resultant progressive wave-like tilting of' tlie disc, as, described, it is maintained in centered" relation, 'with its central {opening 58 in alignment withflinlet opening 59 in the cap, by circumferentially progressive point contact or engagement of the inner annular corner edge 65 of the disc with'the peripheral shoulder; 64 on the diaphragm. In this way, the disc isfcontinuously maintained in said axially centered relation with a m'inirnum of frictional contact with the conical guide surfaces, and without pivot pins or other obstructions' at the center'of. the disc. Accordingly,vmilk enters the pump chamber C through inlet opening 59 in, cap. 44, and fillswedge-shaped pockets at diagonally andaxially opposite sides'of the disc (see Figure 3) and is continuously moved by circumferentially progressive tilt ing actio'nof the disc toward the outlet opening 62 in the pump casing, thereby to be conveyed under substantial pressure induced in the pumpchamber C to a milk treating or other device, such as a cream separator.

Because of the; substantially unrestricted flow of milk from the inletj59 tothe pockets at both sides of the disc, movementfwithin the pump chamber C toward thefoutlet' 'opening' 62 will be without substantial agitationor' turbulence which could have detrimental effect on the. quality. of the milk. The flywheel-like action of the rotor head 30 obviatesfchattering or vibration within the pump. 7

When the-motor 16'is stopped after a pumping period of operation, and the magnetic coil is de-energized, the Wobbler disc 55 will be de-magnetized and free to fall by. gravity into edgewise support on the bottom of peripheral. 'wallj40, as indicated by chain-dotted lines in Figure 3. That is, the disc 55 will always be freely and unobstructedly supported me substantially axially centered position for tilting movement in all directions, and there being no pins or other obstructions to inter fer with subsequent self-centering movement of the disc and progressive tilting action of the same, as when the pump. is again operated as described. That is, upon subsequent rotation of the rotor head 30, the disc 55 will again be attracted to a self-centered, inclined posi tion forcontinuous progressive tilting movement of the same.

Modified pump units Referring to Figure 7, there is illustrated a modified form of pump unit 76 clamped in seated relation on a rotor unit 18a which is in allrespccts like the rotor unit 18 described in connection with Figures 1 to 6, like parts thereof being designated by like numerals. The pump unit 76 is substantially similar to the pump unit 20 of Figures 1 to 6, except that it includes a modified form of self-centering means forthe disc 55. Accordingly, again like parts will be given like numerals unless otherwise designated.

Inthe operational condition of the pump, the disc 55 is drawntoward the frusto-conical surface 54a of diaphragm 41a, and into the tilting position shown by the full lines in Figure 7, as from the chain-dotted line position. Thus the 'disc'is drawn into a tilted position in which a marginal corner edge at the outer periphery thereofiis complementally seated'in substantial point contact with an annular filleted seat 77 defined at. the juncture of .said frus'to-conical face 54a and a radially arcuate innerperipheral surface 78 of inner pump. wall 40a. When the rotor head 30 is continuously rotated as before, magneticextension 35 moving in a circular orbit will cause circumferentiallyf progressive tilting. of the disc 55 while"itis continuously maintained in self-centered rel tiOn with respect to the axisof the pump.

Figures 13 and 14 illustrate another modified form of pump unit 29a utilizing a magnetically attractive wobbler disc 55 of one or other of the types shown in Figures 8 to 12, but wherein a disc 55d is provided with a substantially thick outer marginal portion 552 of non-magnetic metallic or rubber-like material. Accordingly, dur ing operation of the pump as previously described, particularly in connection with Figures 1 to 6, the non-magnetic portion 55c of the disc acts as a barrier or insulator to prevent short circuiting of magnetic flux from the outer edge of the disc to the peripheral wall 39a of the casing, which is of magnetic material. This makes it possible to obviate provision of a non-magnetic insulating sleeve part, corresponding to peripheral wall 40 in Figure 3, so that the path of the magnetic flux from the rotating magnetic extension 35a will be through disc part 55d, cap 44-, peripheral wall 39a, and back to the coil 29a through the Walls of the magnetic attraction unit 1811.

By this provision of a single peripheral wall 39a on the pump casing, certain major parts of the pump generaily may be reduced in size, with a corresponding reduction in cost of manufacturing the pump.

Throughout the foregoing description, reference has been made to magnetic and non-magnetic materials. This means, generally, magnetic material, such as a certain type of stainless material which is highly pervious to passage of magnetic flux, and non-magnetic material, such as another type of stainless steel, which is relatively impervious to passage of flux, and serves substantially as an insulating means. It has been found, moreover, that while the inner walls of the pump casings, referred to herein as the diaphragms, may be of magnetic metal, the improved pump will operate more efiiciently if the diaphragms are of non-magnetic metal, the only requirement being that the material be of such character as to permit passage of flux therethrough, which almost any material will do. As an example, flux from a common small magnet will attract metal through paper.

Conclusion In all forms of the present invention, the pump unit is completely sealed against entry of foreign matter to the pump chamber C from any source whatsoever. The pump unit may be easily removed from the rotorhousing 18 by releasing the nuts 7i, turning the bar 67 in clockwise direction to be free of the nuts and the-rods 7t and removing the bar outwardly of the neck 60 of cap 44. This permits rapid removal of the pump casing from seating position in seat 3$ of the rotor housing, after which the cap 4 3 is readily removed from the pump body 39 for access to the interior of the pump chamber and removal of the Wobbler disc 55, as for cleaning the various parts. Conversely after these parts have been thoroughly cleaned, they are just as readily assembled in the liquid-sealed, operative positions thereof previously described, by means of the quick-operating clamping device 21.

Further modifications of the invention may be resorted to without departing from the spirit thereof or the scope of the appended claims.

What is claimed is:

1. The combination with a magnetic pump or like device including a casing having walls defining a pump chamber and revolving magnetic attraction means,

magnetically attractive Wobbler element mounted in said chamber for continuous circumferential tipping movement by said revolving magnetic attraction means, said Wobbler element comprising a body formed of closely arranged portions of magnetically attractive materit adjacent said portions being generally electrically insulated from each other to minimize eddy currents by magnetic fiux passed through the body.

.2. The combination as set forth in claim 1, wherein said magnetically attractive material is laminated magnetic metal.

3. The combination as set forth in claim 1, wherein said magnetic material is strip metal arranged in a spiral thereof.

4. The combination as set forth in claim 1, wherein said magnetic material is strip metal arranged in a spiral thereof, said spiral metal being contained in a casing of magnetically attractive material.

5. The combination with a magnetic pump including a casing having walls defining a pump chamber and revolving magnetic attraction means, a magnetically attractive Wobbler element mounted in said chamber for continuous circumferential tipping movement by said revolving magnetic attraction means, said wobbler element comprising a body formed of closely arranged portions of magnetically attractive material, adjacent said portions being generally electrically insulated from each other to minimize eddy currents by magnetic flux passed through the body, said portions being a plurality of axially superposed sheets of magnetic metal.

6. The combination with a magnetic pump including a casing having walls defining a pump chamber and revolving magnetic attraction means, a magetically attractive Wobbler element mounted in said chamber for continuous circumferential tipping movement by said revolving magnetic attraction means, said Wobbler element comprising a body formed of closely arranged portions of magnetically attractive material, adjacent said portions being generally electrically insulated from each other to minimize eddy currents by magnetic fiux passed through the body, said body being contained in hollow casing of relatively magnetically attractive material, and said portions of the body being an agglomerate of pieces of magnetic metal and an insulating material separating the pieces.

7. The combination with a magnetic pump including a casing having walls defining a pump chamber and revolving magnetic attraction means, a magnetically attractive Wobbler element mounted in said chamber for continuous circumferential tipping movement by said revolving magnetic attraction means, said Wobbler element comprising a body formed of closely arranged portions of magnetically attractive material, adjacent said portions being generally electrically insulated from each other to minimize eddy currents by magnetic flux passed through the body, means providing a circuit for magnetic flux from said magnetic attraction means through said disc and exteriorly of said casing back to said magnetic attraction means.

8. A magnetic pump, comprising a casing having walls therein defining a fluid-pump chamber, a relatively thin inner wall of said casing being of material having the property of passing magnetic flux therethrough and having a generally conical portion dished inwardly of said chamber, a Wobbler element mounted in said chamber, a rotor having a magnetically energizable core rotatable on an axis through the center line of said conical portion, said core having a generally circular body encased thereon, said body being a composite of magnetic and nonmagnetic materials, the magnetic portion of said body being in magnetic conductivity with said core and terminating in a surface portion complemental to said generally conical portion at the concave side thereof and in spaced relation thereto, said terminal surface portion thereby being generally offset with respect to said axis, and means for rotating said rotor whereby through magnetic attraction of said Wobbler element to the rotating magnetic extension the wobbler element is continuously tipped at an inclination to said axis of said rotor in circumferential progression.

9. A magnetic pump as set forth in claim 8, including a support for said casing having a peripheral opening through which said body extends, the edge of said peripheral opening being spaced with respect to the outer periphery of said body, means being provided for fluid sealing said space.

' 10. A magnetic pump as set forth in claim 8, wherein 11 casing having peripheral and innerand outer walls defining a fluid-pumping chamber having an axis therethrough, said casing having seat portions seating against said seat means, said inner wall being relatively thin and being of material having the characteristic of passing magnetic flux therethrough and said outer wall being in axially spaced relation to said inner wall, a magnetically attractive Wobbler disc mounted in said chamber to have tilting movement in all directions angularly of said axis, rotatable magnetic attraction means presented exteriorly of said chamber and terminating adjacent said inner wall at a point offset with respect to said axis to move in a continuous orbit about the same, progressively to attract said disc toward the inner wall and to tilt the disc whereby it is continuously tipped at an inclination to said axis in circumferential progression, peripherally spaced elements on said housing to extend outwardly of said casing, a clamping bar mounted between said spaced elements, and adjustable means on said elements operable against said bar to clamp said easing into seating engagement of said seat portions thereof with said seat means, the spaces between said elements radially outwardly of said peripheral wall of the casing being free and unobstructed, said casing having a conduit or like radial extension from i said peripheral wall in said free and unobstructed spaces in one of various selective positions of rotational adjustment of the casing in said seat means.

17. A magnetic pump, comprising a housing having an opening therein and seat means around said opening, a casing having peripheral and inner and outer walls defining a fluid-pumping chamber having an axis therethrough, said casing having seat portions seating against said seat means, said inner wall being relatively thin and being of material having the characteristic of passing magnetic flux therethrough and said outer wall being in axially spaced relation to said inner wall, a magnetically attractive Wobbler disc mounted in said chamber to have tilting movement in all directions angularly of said axis, rotatable magnetic attraction means presented exteriorly of said chamber and terminating adjacent said inner wall at a point ofiset with respect to said axis to move in a continuous orbit about the same, progressively to attract said disc toward the inner wall and to tilt the disc where by it is continuously tipped at an inclination to said axis in circumferential progression, peripherally spaced elements on said housing to extend outwardly of said casing, a clamping bar mounted between said spaced elements, and adjustable means on said elements operable against said bar to clamp said easing into seating engagement of said seat portions thereof with said seat means, the spaces between said elements radially outwardly of said peripheral wall of the casing being free and unobstructed, said casing having a conduit or like radial extension from said peripheral wall in said free and unobstructed'spaces in one of various selective positions of rotational adjustment of the casing in said seat means, said outer wall of the casing including'a cap removably seated in sealed relation on said peripheral wall, said clamping bar having portions engaging said cap to hold the same seated in said sealed relation.

18. A magnetic pump, comprising a housing having an opening therein and seat means around said opening, a casing having peripheral and inner and outer walls defining a fluid-pumping chamber having an axis therethrough, said casing having seat portions seating againstsaid seat means, said inner wall being relatively thin and being of material having the characteristic of passing magnetic flux therethrough and said outer wall being in axially spaced relation to said inner wall, a magnetically attractive Wobbler disc mounted in said chamber to have tilting movement in all directions angularly of said axis, rotatable magnetic attraction means presented exteriorly of said chamber and terminating adjacent said inner wall at a point offset with respect to said axis to move in a continuous orbit about the same, progressively to attract said disc toward the inner wallv andto tilt the disc whereby it is continuously tipped at an inclination to said axis in C11- cumferential progression, peripherally spaced elements on said housing to extend outwardly of said casing, a clamping bar mounted between said spaced elements, and adjustable means on said elements operable against said bar to clamp said easing into seating engagement of said seat portions thereof with said seat means, the spaces between said elements radially outwardly of said peripheral wall of the casing being free and unobstructed, said outer wall of the casing including a cap removably seated in sealed relation on said peripheral wall, said clamping bar having portions engaging said cap to hold the same seated in said sealed relation, said peripheral wall of the casing being a composite of inner and outer stratas of different materials, the outer said strata being of magnetically attractive material, said cap being of magnetically attractive material and being seated on said inner strata, the inner said strata being of magnetically non-conducting material and being seated on said seat means, the path of magnetic flux being from the magnetic attraction means through said diaphragm, said disc, said cap, and returned through conductor means provided externally of said casingback to the magnetic attraction means.

19. A magnetic pump, comprising a housing having an opening therein and seat means around said opening, a casing having peripheral and inner and outer walls defining a fluid-pumping chamber having an axis therethrough, said casing having seat portions seating against said seat means, said inner wall being relatively thin and being of material having the characteristic of passing magnetic flux therethrough and said outer wall being in axially spaced relation to said inner wall, a magnetically attractive wob' bler disc mounted in said chamber to have tilting movement in all directions angularly of said axis, rotatable magnetic attraction means presented exteriorly, of said chamber and terminating adjacent said inner wall at a point offset with respect to said axis to move in a continuous orbit about the same, progressively to attract said disc toward the inner wall and to tilt the disc whereby it is continuously tipped at an inclination to said axis in circumferential progression, peripherally spaced elements on said housing to extend outwardly of said casing, a clamping bar mounted between said spaced elements, and adjustable means on said elements operable against said bar to clamp said casing into seating engagement of said seat portions thereof with said seat means, the spaces between said elements radially outwardly of said peripheral wall of the casing being free and unobstructed, said outer wall of the casing including a cap removably seated in sealed relation on said peripheral wall, said clamping bar having portions engaging said cap to hold the same seated in said sealed relation, said peripheral wall of the casing being a composite of inner and outer stratas of different materials, the outer said strata being of magnetically attractive material, said cap being of magnetically attractive material and being seated on said inner strata, the inner said strata being of magnetically non-conducting'material and being seated on said seat means, the path of magnetic flux being from the magnetic attraction means through said diaphragm, said disc, said cap, and returned through conductor means provided externally of said casing back to the magnetic attraction means, said conductor means comprising said clamping bar, said elements, and said housing.

20. The combination with a magnetic pump including a casing having walls defining a pump chamber and revolving magnetic attraction means, a magnetically attractive Wobbler element mounted in said chamber for continuous circumferential tipping movement by said 'revolving magnetic attraction means, said Wobbler element comprising a disc-like body which is substantially pervious to passage therethrough of magnetic flux from said. magnetic attraction means, said body having around the peripheral edge thereof an annular portion of material 13 which is substantially impervious to passage of magnetic flux.

21. The combination with a magnetic pump including a casing having walls defining a pump chamber and revolving magnetic attraction means, a magnetically attractive Wobbler element mounted in said chamber for continuous circumferential tipping movement by said rcvolving magnetic attraction means, said Wobbler element comprising a disc-like body which is substantially pcrvious to passage therethrough of magnetic flux from said magnetic attraction means, said body having bonded thereon a marginal portion of substantial cross-sectional area and of material which is substantially impervious to passage of magnetic flux.

References Cited in the file of this patent UNITED STATES PATENTS Andrews May 15, 1928 Hunter Mar. 10, 1936 Myers May 21, 1940 Carpenter Aug. 4, 1942 Blessing July 15, 1947 Aske Sept. 21, 1948 Aske May 10, 1949 Hunter Apr. 16, 1957 FOREIGN PATENTS Great Britain Feb. 3, 1921

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