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Publication numberUS1881724 A
Publication typeGrant
Publication dateOct 11, 1932
Filing dateApr 25, 1931
Priority dateApr 28, 1930
Publication numberUS 1881724 A, US 1881724A, US-A-1881724, US1881724 A, US1881724A
InventorsErwin Lehrer
Original AssigneeIg Farbenindustrie Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Magnetic piston pump
US 1881724 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Oct. 11, 1932. E. LEHRER 2 MAGNETIC PISTON PUMP v Filed April 25, 1931 2 Sheets-Sheet 1 Fig.1.

INVENTOR Erwin Le7zre r BY 71115 ATTORNEYS Oct. 11, 1932. LEHRER 1,881,724

r I MAGNETIC PISTON PUMP Filed April 25. 1931 2 Sheets-Sheet 2 Fig.2.


The present invention relates to improvements in magnetically operated piston pumps.

Pumps for the movement of see and liquids are already known in which the istous consisting of a piece of iron are move backwards and forwards horizontally by the attractive power of coils traversed by currents.

I have now found that the regulation of the ma net coils may be efl'ected simply and surely y an electromagnetically operated pendulum with two contacts by which the coils are alternately connected to the source of current. It is especially 'advanta cons to arran e the two contacts in an annu ar tube in winch there is mercury which effects the closure of the circuit by the movement of the pendulum. Other forms of contact may of course be employed instead of an annular tube, as for example two separate contacts which the pendulum strikes.

In order'to reduce the great friction produced by the horizontally moved piston and which must be overcome by the magnetic attraction, it is preferable to arrange the piston in a vertical cylinder and to take the load thereof, for example with a spring. In this manner the friction of the piston is reduced to a minimum'and the efliciency of the pump is considerably/improved.

Instead of metallic pistons, a column of liquid in a -U-tube may be employed as the piston, the liquid being set in-oscillation, by means of one or two ferromagnetic cores floating on one or both legsof the liquid, the cores being operated by one or two electroma neticcoil'.

apecial advantage in the employment of liqui columns instead 'of metallic pistons consists particularl in the completely pressure-tight closure 0 tained without appreci able increase in the loss caused by friction. It is therefore possible with such pumps to move equal volumes of different gases at the same time. When only one gas is to be moved, the suction andoutlet openings of the valge member are preferably joined toget er. A I

It is preferable to excite the coils in correspondence with the frequency of the oscillations of the column of liquid because the efficiency of the pump is thus increased.

The nature of the invention will be further described withreference to the accompanying drawings which illustrate, diagrammatica ly and partly in section, arrangements of apparatus according to this invention, but the invention is not restricted to these arrangements.

Iugure 1 is a vertical section throu h a pump having a reversing device whic is actuated b a endulum operated electroma ncticali y. 1 i ures 2 and 3 illustrate mo ifications of t e ump in vertical section, cach piston of tiese pumps being relaced by a liquid on which float one or two erromagnetic cores.

Referring to Figure 1, a ferromagnetic piston c WillCl is readily movable but without play is suspended on a spring (1 in a vertical cylinder a havin a lateral joint 6." Two windings e and i as for example two copper wire coils, are wound round the cylinder a. They are alternately joined to a source of current by a commutator U. The iston c is thus moved up and down, the liqui or gas to be moved beim sucked in through the lower valves of the valve member 9 and forced out through the upper valves. The commutator U which serves for regulating the magnet coils c and f is constructed as an annular tube at having a mercury filling by which the contacts or 0 are joined to n according to the position of the pendulum h.

The )e'ndulum it, having a movable pendulum ody i is operated electromagnetically by means of the coil 1 by which an iron body in consisting of strips of sheet iron is attracted. The connections of the coil 1 to the commutator U will. be seen from the drawin s.

n order to obtain a uniform and quiet operation of the pump and still further to improve its eiiiciency it is advantageous to adjust the oscillations of the endulum to the peculiar oscillation of the piston-spring system by movin the pendulum body a.

oreover, 1t is preferable to prepare the iston c-not from a massive piece of iron but mm a tube filled with strips of sheet iron because the pump may then be actuated by ployed, which necessitated either a ransformer aggregate or the presence of a batterv of accumulators. v

eferring to Figure 2, which illustrates a pump in which the piston is re laced by a column of liquid, a liquid 0, as or example mercury or another iquid having a very high specific gravit and a low vapor tension is. laced in a U-tu e p. On one arm of the co inn of liquid floats an iron core q. Two coils f and e are wound round this and are provided with three contacts 1, 2 and 8. The contacts 1 and 2 are connected .with a commutator as shown in Figure 1 which alternately connects the coils with a sourcepf current. The contact 3 is connected directly to one ole of the source of current. The upper en s of the U-tube p are closed by the valve members 1' and a through which the mamas my hand.


material to be moved is sucked in at the bot- 7 m and forced out at' the top by the movement of the column of liquid.

Referring to Figure .3, which illustrates a modification of the amp shown in Figure2, iron cores t and u oat on both arms of the column of liquid 0. The arms of the U-tube each have a coil 6 and f having contacts 4, 5 and 6 which are connected as described in regard to Figure 2. The'method of opera tion is similar to that described with reference to Figure 2.

In the appended'claims the term ferromagnetic piston" is used to include both the metallic form of piston hereinbetore referred to as well as aliquid serving as the piston and bearing one or more magnetic floats.

What I claim is:

1. In a fluid pump, in combination a vertical cylinder, a ferromagnetic piston in said cylinder, at, least one cell on said cylinder adapted to eriodicall act on said piston, and a; pendu um provi ed with current leads and contacts, thereby periodically connecting said coil to a source at current.

9. An arran ment as claimed in claim 1 in I which, two co s are altetrnately connects to said sou ren '8. arrangement as claimed!!! claim 1 in which two cells are provided and these are of cur alternately connected to said source of our-- rent and in which the pendulum is provided with an annular tube containing three contacts and being partly filled with mercury so u t that the mercur makesan electric mm between two of he said three contacts alter- .ylinder, a ferronia natel on oscillation of the pendulum.

4- n a. pump, in combination a vertical etic piston in said cyliner, a spring m sea 0 linder taking the load of said piston, at leas one d'er adapted to periodically act on said pisrovided and base are coil on said eylln-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2481320 *Jun 5, 1945Sep 6, 1949Atomic Energy CommissionMagnetic pump
US2782863 *Aug 2, 1952Feb 26, 1957Gen Motors CorpPropeller governor mechanism
US4845517 *Jan 11, 1988Jul 4, 1989Am International, Inc.Droplet deposition apparatus
US6241480 *Dec 27, 1999Jun 5, 2001The Regents Of The Unversity Of CaliforniaMicro-magnetohydrodynamic pump and method for operation of the same
U.S. Classification417/417, 417/99, 318/134, 318/122, 417/98, 318/131, 318/15
International ClassificationF04B17/03, F04B17/04
Cooperative ClassificationF04B17/044
European ClassificationF04B17/04B2