US902501A - Pump, &c. - Google Patents

Description

F. W. MACHLET.l

PUMP, 6.0. APPLICATION FILiED NOV. 20, 1907. 902,501. Patented 0013.27, 1908.

4 SHEETS-SHEET 1.

W/7'NESSES F., W., MAGHLET.

PUMP, @0.

APPLICATION FILED NOV. 20, 1907.

fl wwwllm x F. W. MACHLET.

PUMP, 5w.

AI-PLIOATION FILED NOV. 20, 1907.

Patented Oct. 27, 1908.

W/TNESSES P. W. MACHLET.

PUMP, 6m.

APPLICATION FILED NOV. 20, 1907.

92 Patented 0013.27, 1908.

i 4 SHEETS-SHEET 4.

ATTO Ey FRITZ W. MACHLET, OF ELIZABETII, NEW JERSEY.

PUMP, ac.

Specification of Letters Patent.

Patented Oct. 27', 1908.

Application filed Novem'nei` 20, 1907. Serial No. 402,957.

To all whom it may concern:

Be it known that I, FRITZ W. MACHLET, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Pumps, &c., of which the following is a specification.

This invention relates principally to liquid seals or packings for the pistons of pum s, blowers, engines, etc., especially those of t e rotary type, and particularly to blowers or air viiini'iressors; an( it further relates to means for cooling the air compressors or pumps.

I illustrate my invention in connection with a rotary pump of the type shown in YUnited States Patent No. 825,671 granted to me July 10, 1906, in which is disclosed a ylindraceous drum within which is mounted cccentrically to the drum a cylinder having a double vane or piston adapted to project alternately from o posite sir es of said cylinder during each revo ution thereof; the face-wise or revolvingT movements of the' double vane being controlled by said cylinder while the radial movements of the vane in and out of the cylinder are controlled by a hub acting in cooperation with a fixed stud. While there is a large demand for low pressure air pumps of many kinds, including the type disclosed in said patent, still it has not heretofore been found practicable to secure by means of said pumps a greater pressure than about four pounds per square inch. I have devised means whereby puni s of this general classinay be caused to de iver air steadily at a pressure of many more than four pounds to the square irmh, and even as high as twenty pounds. The capacity of. pumps of this class has heretofore been limited because of the escape of air past the pistons and through the other joints of the pump, whenever it has been attempted to produce three or four pounds pressure. y I have dcvised means whereby a constant flow of liquid is effected from a service pipe to the edges of the piston or pistons of a rotary pump, to seal said pistons sufficiently to enable pressure of the delivered air to be raised far abovethat which has heretofore been found practicable, and have thus vconverted a low pressure blower to a inodorate-pressure air coinpressor.

In, the the'drawii'igs,` the sealing Yliquid-.is introduced through the studv and passesrhcnce form of `the invention illustrated in position.

through internal passages formed in the piston or vane to the edges of the latter, said edges having recesses which are filled by the liquid, thus forming a seal sufficient to hold the air up to twenty or even more pounds pressure per square inch. This liquid, of course, escapes and gradually collects on the delivery side of the pump or compressor, and I preferably arrange a separator to collect the liquidat the delivery side ofthe pump, and the collected liquid is led baci; from the separator into the pump through said stud and again begins its circulation. It will be understood that the pressure ofthe delivered air issufficient to force the liquid back through the stud and the piston or vane into the drum of the pump, so that the circulation is practically unintermittent, and little or noopportunity is given for leakage of air past the piston. The liquid is also forced by the same means through other joints in the pump to seal all of them, with great resultant economy of operation. Preferably a cooling coil is inserted between said separator and said stud, so that the sealing liquid is cooled before againk entering the pump, and this suffices to counteract the heating tendency of the air compressing operation, so that the same fiow of liquid serves both to seal the moving p arts and cool the entire pump. The

invention may beapplied to various other.

forms and types of pumps, compressors, blowers and engines, including engines driven by compressed air or steam.

In the accompanying drawings, Figure 1 is a longitudinal sectionalview of a ,rotary pump or compressor provided with my iin- I movements. Fig. 2 is a transverse section about the line X-X of Fig. 1, but showing the double vane or piston in a horizontal position, instead of the vertical position seen' at Fig'. 1. Fig. 3 is a transverse sectional view showing the double vane in a vertical position, and also. illustrating the manner of y `connecting the same to its controlling stud.

This View is taken about at the line Y-Y of Fig. 1. Fig. 4 illustrates a separator provided at the delivery side of the pump and cylinder and piston ofthe latter. Fig. 5 is a ics view similar to 2 but taken at aboutv the line Y--Y 0f Fig. 1,.` Fig. 6 is a view sie to Fig. 5 .but showing the piston mi `Figf illustrates a cooliuIk ratiis.

l"the side Walls 5,6 thereof.

v ormed in the head 5.

As set forth in said atent, the cylindraceous drum 1 is provide with an inlet 2 and an outlet 2a, between which is mounted a revoluble cylinder 3 eccentric to the drum and running in contact with a saddle or abutment 4. The 'cylinder extends the full length of the drum and it's closely between Mounted in peripheral slots 7, 8 in the cylinder is a diametrical plate structure, one end ortion 9 of which is `seenat Fig. 3 projecting from the cylinder and extending to the inner .periphery 10 of the drum, while the other portion 11 of said plate or piston is drawn into the cylinder.

Saidpotions 9 andll constitute op osite istons or vanes, and may be regar -ed as forming a double vane. It extends from wall 5 to wall 64 oi the drum, 1. l

The double vane is formed with a central rectangular recess 12 the opposite edges of which lit into mortises 13 formed rada ly in opposite sides of a hub member or shoe 33.

havlng' a pair of flanges 34, in which are formed said mortises 13. The hub member is` rigidly secured to the double .vane and controls the endwise or radial position thereof,

being te this .end provided With a transverse slot 15, which is perpendicular to the plane of the double vane, and extends u on op osite sides thereof Within the cylin er 3, t at is, said slot is continuous through therecess 12 inthe double vane. In enga ement with this slot is a revoluble slide 19 tted upon a stationary stud 16, which projects inwardly from the vertical wall 6 of the drum. Said stud extends in through a boss 18 formed on the outer side of the drum head. The c linder 3 has aV hub 21 mounted upon a shat 22 provided with-'a fly-wheel 23, said hub occupying a cup-like depression vor recess 24 As the cylinder 3 rotates, the doble'vane 9, 10l is carried around vface'wise thereby,

whileowing to the connection ofthe stud 16 with the slotted hub or shoe 33, the ti s of the vanes 9, l11 are always equidistant om the said stud 16. As the cylinder rotates,

the vanes move radially in and out relatively thereto, the radial positions of the vanes being always positively controlled by the stud 16 independently of the inner periphery of the drum 1, said inner periphery bemgof der l3, as indicated .atl 38.; -V From cylindraceous contour to correspond to the path taken by the 'tips or outeredges of the ouble vane. The stud 16 1s about central of the dru-m.- The tips of' :thevanes may clear the in ner periphery 10 of the drum by a few thousandths of an inch, so that friction at lthis point may be eliminated.

The liquid, for sealing the piston and. other joints, enters through a pipe 35 and passes through a bore 36formed in the stud 16, and

I escapes directly intovthe' cylinder- 3 through oriiices'37 ,and the. interior of said cylinthence the port 43.

liquid oozes through passages in the double of the double vane to be 'lilled with the liquid for the purpose of sealing the latter.v The liquid passes from the cylinder into the interior of thepiston through ports 40 and 41- formed in cheek B. Said ports are separated lby a block 42 corresponding withthe blocks 39 and iilling the space between the cheeks A and B, so that the asJsa es in one vane are out of communicatlon with the passages in the other vane. d

At Fig. 6, one end of the piston is shown as having completed its delivery stroke, and its port 41 is closed, so that liquid shall not pass therethrough until this end of the doublepistpn has passed the delivery andintake ports -43 and 44 of the p'ump, to avoid excessive loss of the liquid or false movements thereof. The port 41 is self-closing, since the face of the cheek B slides in contact with a plate 45 projecting inwardly from the head 21 of the cylinder 3 and rigidly secured thereto, said plate forming a gate or valve for said port. The gate 45 serves also for the port 40, and during ther rotation of the pump the valves 40 and 41 are opened and closed in alternation, owing to the endwise movements of the double piston in andl out of the cylinder 3. As will be understood by reference to Figs. 5 and 6, the port 40, which is closed until the piston passes-the portI 44, gradually opens as the piston rises, and is fully open wheny the latter stands vertically, and from that point gradually closes until the iston reaches the The ports 40 an 41 are both'preferably on the one side of the double piston, and the gate 45 lies alternately under and -so A over the double piston, but other forms of ports and valves may be employed and other- Wise operated. The edges of the double piston along the recess L12 are closed by iilling blocks 46 extending from the head 6 of the drum to the inner end of said recess,- to pre,-

20 piston,

vent the li uid from flowing from the cylinder 3 into t e internal passages ofthe except through the ports 40 and 41,.

.The liquid, which is supplied to the pump'v under pressure, oozes out from the edges of ythe piston, and tends to flow towards the in-4 take or low 'pressure side of the pump and there to accumulate, as at 47 The succeeding blade of the piston picks up some of the 'accumulated liquid at 47, as indicated at48,

to carry the same over to the delivery yside of the pum and it also sweeps along any liquid that gat ers on the inner periphery 10 and walls of the drum. Any liquid that ldrops on to either piston, as at L18 or 49, is also carried over to the delivery side the accumulation atthe latter point being indicated at 50. This accumulation is preferably disposed of by means of a separator 51, into which the delivery pipe 52 of the pump delivers the mixed air'and fluid. The separator has a bafflecone 53 and one or more baffles 54, which cause the liquid to be precipitated at 55 in the bottom of the separator; and from thence it is led through the pipe back into the pump; the pressure of the delivered air in the air-drum 56 or the separator being ample to force the liquid to ooze through the passages in the piston to the intake or low pressure side of the pump, so that constant circulation is maintained and the pump is enabled to deliver air at many times the pressure that has heretofore been found practicable in this general class of pumps. I

@wing to the pressure behind the liquid which is within they cylinder 3, the liquid tends constantly to ooze out between the annular 'flange57 at one end thereof and the head A6 of the drum, whereby this end of the ,cylinder is likewise sealed. ln the other end of the cylinder may be provided one or more perforations 58 through which the liq uid may flow into the space 24 in which the hub 21 of the cylinder revolves. From said space, the liquid oozes out between the head 5 of the drumand this end of the cylinder, thereby sealing the latter, and it also oozes along between the shaft 22 and'` its bearing 59, and near the end of said shaft collects in an annular pocket 60, from which may lead a duct 61 to the intake or lowpressure side of the pump, as seen at Fig. 3. The liquid in the cylinder 3 also oozes out between the sides of the piston or vane and the walls of the slot 7, 8, to seal this joint, thus completing the provision against leakage of air. It will be understood that the shoe 34 is not only rigid with the double piston, but also abuts against the edges of the cheeks at the inner end of the recess 12, thereby closing the space between the cheeks.

At Fig. 1 it will 'be understood that the liquid passes from the pipe 86 constantly through all of the 4orifices 37 directly into the body4 of the revolving cylinder 3; and (as indicated by the arrows) from there it enters through port into the space between the cheeks of the double piston 9, filling all of said space and oozing out from the tip and sides of the piston. When the piston is turned' through half a revolution from the Fig. 1 position,"the liquid enters from the cylinder througl'i port 41 between the cheeks of the double piston 11, with like results.`

At Fig. 6 liquid isseen entering from the) piston*l 3 through'nthe port 46 between` thev Preferably a cooling coil 62, Fig. 7, is inserted between the separator 51.and the pipe 35, tocool the circulating liquid, and thereby reduce the temperature of the pump due to the air-compressing operation. The coil may be inserted in a tank 63 having a suitable inlet 64 and outlet 65 for a cooling liquid 66.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

It will be seen that the principal or only function of gate is to prevent loss of liquid from the tips ofthe double piston as they pass the low-pressure port in the main'drum 1 but in cases where no openings are provided in these tips, there can be no such loss, and hence the gate 45 may be omitted. will be understood that in some cases the openings may be omitted from the tips, since the latter may carry up enough liquid orf'drip from the bottom of the drum to effect the desired sealing of the tips, that is, of those edges of the piston that are parallel with and at the greatest distance from its axis of revolution.

Having thus described my invention, I claim:

1. A rotary air or gas pump comprising a drum, a hollow cylinder revolving therein, a vane or piston sliding in and out of said cylinder and fitting to the interior of the drum, and means for conducting liquid from the cylinder to the edges of the vane to form a seal or packing for the latter l 2. A rotary air or gas pump comprising a drum, a hollow cylinder revolving therein, vanes or pistons sliding in and out of said cylinder and fitting to the interior of the drum,

vmeans for supplying liquid to the interior of the cylinder, and means for conducting the liquid from the cylinder to the edges of the vanes to form seals or packings for the latter.

3. A rotary air or gas pump comprising a drum, ahollo'w cylinder revolving therein, means for supplying liquid to the interior of said cylinder, anda vane or piston sliding in and out of said cylinder and fitting to the interior of the drum, said vane having internal passages for the liquid from thecylinder to the edges of the vane. i

4. A rotary air or gas pump comprising a drum, hollow cylinder revolving therein,

means for supplying liquid to the interior of of said plates having a portfor the passage of f liquid rom thecylinder into the spacebe`l A se tween the plates, and suitable recesses or openings bemg provided at the edges ofthe' means for supplying liquid to the interior ofv said cylinder, a vane or ipiston sliding in and out of said cylinder and tting to the interior of the drum, said vane comprising opposing l plates slightly separated from each other, to

orm a passage for the liquid from the cylinder to t e ed es of the vanes to vform a seal or packing for t elatter. p ,c

7. A rotary air or gas pump, blower or the like comprislng a drum, a vane or piston within the drum andvfitting to the inner wall thereof, a revolving support for the piston, and means for forcing liquid from the revolving support to the edges of the piston to form a seal or packing therefor.

8. /A rotary a1r or gas pump, blower or the like comprising a drum, a vane or piston within the drum and fitting to the inner wall thereof, a revolving su port for the piston, and means for forcing iquid into the pump through said revolving means and to the edge of the piston to forma seal or packing therefor.v 'l

l 9. A double vaneor piston for a rotary airA or gas pump comprising two plates slightly separated from each other to form internal passages for li uid from the hub portions of the vanes to t e edge portions t ereof, the passages in one vanebeing out of communication-with the passages in the other vane.

10. A vane or piston for a rotary air or gas pum comprising two plates slightly separat from each other, to form 'an internal passagefor'a liquid from the hub portion of the vane to the edgeortions thereof; said plates being joined by studs or unionsy well Within the contour .of the vane, to leave previces or recesses around the edges of the Vane.

11'. A double vane or piston for a rotary airI or gas pum comprising two plates slightly separate from each other to`form internal assages for liquid from the hub ortion of tfie double vane to the edge portlons thereof, said plates beingunited by means of intermediate studs or lates including one at the middle ortion of t e double vane, which servesl to reak communication from one vane to the other. f

12. A vane or piston for a rotary a'ir' or gas pum comprising two plates slightly'separate from each other, to form an internal passage for liquid from the hub portion of the vane to the edge portions thereof; one of said plates being formed at its hub with a port for the admission of liqui 13. A double vane or piston for a rotary air or gas pump comprising two plates slightly separated from each other to form (portion f internal, passages for liquid from the hub pore tion of t e double vane to the edge portions thereof, said plates being united by means of intermediate studs or plates including one at the middle portion of the double vane, which serves to break communication from one vane to the other, each vane formed near itshub portion with a port for the admission of liquids. K

14. lThe combination with a rotary air or gas pump or the like comprising a drum, a

gas pumpor the like comprising a drum, a`

hollow cylinder revolving therein, a double vaneor piston sliding in and out of opposite sides of said cylinder and fitting to the interior of the drum, said double istoncomprisl ing two opposing plates slig tly separated from each other to form internal passages, la plate or/ partition being provided at the middle of said d'ouble vane to break communication between said passages,` ports ,being provided on opposite sides of sald partition lto effect communication between the interior of the cylinder and the passages in the double piston, of means for forcing liquid into said cylinder and through said ports and passages to the edges of the pistons to form seals for the latter.

16. A rotary air or gas ump comprising a drum havingintake am dehvery ports, a vane or piston revolving within the drum and fitting to the interior walls thereof, means for forcing liquidalong the v ane' to the edges thereof to form a seal or packing for the vane, and means for cuttin(r off the flow of liquid along the vane while the latter is passing the intake port.

17. A rotary air or gas ump comprising a drum having intake an dellvery ports, a vane or piston revolving within the drum and fitting to the interior walls thereof,`

means for forcino` the edges thereofJ to forma seal or packing for the vane, and means for cuttin off the flow of liquid along the vane while t e'latter is passing both of said ports.

18. A rotary air or gas ump comprising a drum having intakean -dellvery ports, a

liquid along the vane to.4

@the vane is passing a drum port.

WQ *Arotary air or gas pump comprising a drum, a` hollow cylinder revolving therein,.a vane or piston sliding in and out of said cylinder and tting to the interior of the drum, a port in said vane within said cylinder, a passage extending from said port through the vane to the edge thereof, means for supplying -liquid tothe interior of said cylinder, an

means for closing said port when the vane is passin the intake and delivery ports provided 1n the drum.

20. A rotary air or gas pump com rising a drum, a hollow cylinder revolving t erein, a double vane or iston sliding in and out of opposite sides ofp said cylinder and fitting to the interior of the drum, a 'port in each of said vanes within said cylinder, passages eX- tending from said ports through the vanes to the edges thereof, said passages bein out of communication with each other7 an means for closing said ports in alternation to.cut off supplyT of liquid to each passage when its vane is passing' a port provided in the drum.

21. A rotary air or gas pump comprising a drum, a hollow cylinder revolving therein, a vane orpiston slidin in and outv of said cylinder and fitting to ttlie interior of the drum, a port in said vane within said cylinder, a passage extending from said port through the vane to the edge thereof, means for supplying liquid to the interior of said cylinder, and means for closing said ort when the vane is passing the intake and) delivery ports provided in the drum, said closing means being in the form of a valve or closure rigid with the cylinder and having sliding engagement with said piston.

22. A rotary air or gas pump com rising a drum, a hollow cylinder revolving t ierein, a

double vane or piston sliding in and out of` olpposite sides of said cylinder and itting to tie interior of the drum, a port in each of said vanes within said cylinder, passages eX- tending from said ports through the vanes to the edges thereof, said passages being out of communication with each other, and means for closing said ports in alternation to cut off supply of liquid to each assage when its vane is passing a port provided in the drum; said orts being upon the same side of the doub e vane and said closing means comprising a valve or closure rigid with said cylinder and having sliding engagement with said double vane to close either of its ports while opening the other.

23. A rotary air or gas pump comprising a drum, a hollow cylinder revolying therein and 'having heads iitting to theldrum heads, a double vane or piston sliding in and out of opposite sides of said cylinder and fitting to the interior of the drum, a port in each of said vanes Within said cylinder, passages eX- tnding from said ports through vthe vanes to the edges thereof, said passages being out of Communication with each other, and means'for closing said ports in alternation to cut off supply of liquid to each passage when its vane 1s passing a port provided in the drum; said orts being upon the same side of the doub e vane and said closing means comprisinga valve or closure rigid with said cylinder and having sliding engagement With said double vane to close either of its ports While opening the other; said valve or closure fixed to one of the heads of the cylinder and projecting therefrom towards the other head thereof, the vane ports being close to the head of the cylinder which carries said closure.

24. A rotary air or gas ump or the like, comprising a revolving hol ow cylinder having a head, said cylinder fitting closely between the heads of a drum, a vane or pliston sliding in and out of saidcylinder and tting to the walls of the drum, and means for supplying liuid to the interior of the cylinder;

said hea of the cylinder having a perforation to permit exudation of the li uid to form a seal or packing between the cy inder-head and the drum head, passages or ducts leading from the interior of the cylinder along the piston to its edges for the ilow of liquid to said edges to seal or pack the same.

25. A rotary air or gas pump orthe like, comprising a hollow cylinder having a head,

a drum wlthin which said cylinder revolves,

a vane or piston sliding in and outrof said cylinder and fitting to the walls of the drum,

and means for supplying liquid to the interior of the cylinder; said cylinder-head'being perforated to permit eXudation of the liquid to form a seal between the cylinder-head and the drum-head, and passages or ducts for the liquid leading from the interior of the cylinder to the edges of the piston to seal or pack the latter.

26. A rotary air or gas pump or the like, comprising a cylindraceous drum, a cylinder within said drum to revolve leccentrically thereto, a vane or piston sliding in and out of the drum, an interior stud projecting from a head of the drum, and having means to control said piston, said stud being hollow and having a perforation within'the cylinder, and 12C means for supplying liquid through said stud to the interior of the cylinder; means being provided to lead the liquid from the cylinder to the edges of the piston to form a seal or packin therefor.

27. .rotary air or gas pump or the like, comprising a cylindraceous drum, a cylinder within-\sa1d drum' to revolve .eccentrically thereto, a vane or piston sliding in and out of the drum, an interior stud projecting from a 130 head of the drum, and havingniean's' to con-'I trol said piston, said stud being holloW and` having a perforation Within the cylinder, means' being provided to lead the liquid from the cylinder to the edges of the piston to form a seal or packing therefor, a separator 4communicatingvvith the vane or piston, the

latter having a passage forthe liquid to its edges, so that the pressure of the delivered a1r or gas forces the separated liquid to the edges of the vane to seal the' same.

29. A rotary air or gas pump or the like,

lcomprising a cylindraceous drum, a cylinder Within sald drum to revolve eccentrically thereto, a yane or piston sliding in and out of the drum, aninterior stud projecting from a head of the drum, and having means to control said piston, said stud being hollow andhaving a perforation Within the cylinder, means being provided to lead the liquid from the cylinder to the edges of the piston to form a seal or packing therefor, a separator connected to the delivery side of the pump, and a conduitl for the separate liquid leading back'from the separator to said stud, to enable the pressure of the delivered air to force the separated liquid through the cylinder; a cooling coil or refrigerator being included in said conduit.

l' 30. A rotary air or gas ump or the like, comprising a hollow ,cylin er having a head, a drum Within/Which said cylinder revolves, a vanevor `piston sliding in and out of said cylinder and fitting to the Walls lof the drum, a separator connected to the deliverysideof the pum a conduit for the separated liquid leading @ack from the separator to said cylinder to enable the pressure of the delivered air to force the separated liquid through the cylinder; passages or ducts for the liquid leading from the interior of thecylinder to the edges `of the iston lto seal or pack the latter; said cylin er-head being perforated to permit exudation of the liquld to form a sea between the cylinder-head and the drum-v head; a shaft secured'to said cylinder-head, vb

a bearing for said shaft, and a duct leading from said shaft to 'the intake side of the pump. .t v

3-1. In combination, a pump or compressor having a piston, the latter having passages forthe flow of liquid to its edges toseal the same, a separator for .the liquid connected to the delivery side ofthe pump, a cooling livery side of the .both a separatoriJ at the Ypump or engine, and meansl to collect and coil ecnnectedy to said separator, and means? -for conducting the liquid from the cooling' coil to said iston.

82.@'Jllie combination with a pump or compressor, of a cooling coil forming part of a seal the same.

34. A rotary air or gas pump or engine comprising a .d-rum, a vane or piston fitting the interior Wallsv of the drum, a revolving supprt for said vane or piston, and means for forcing liquid through said revolving support 'to the edges of said vane or piston to seal the saine; means being provided at the delivery side of the pump or engine to sepa- 'rate the liquid, Iand means to conduct it back to said revolving support.

35. A rotary air or gas pump or engine comprising a drum, a hollow revolving piston-carrying cylinder or member Within said drum and itting atits ends thereto, the cylinder having openings at its ends and formseal said ends, vsaid circulatory system\ including both a separator at the delivery side of the pump or engine and means to' collect the separated liquid and cause it to 'be forced back into said cylinder.

36.A rotary air or gas pump or engine comprising a drum,. a piston having ends itted to the ends of the drum, a revolving member carrying said piston, said revolving member forming art of a circulatory system for liquid to sea said ends of the. piston, means being provided'for conducting the liquid from said revolving member to said ends of the piston, and said circulatory system including bothqasparatorV on the de-V ump or engme and means i to cause the li ui collected by said separator to flow back t rough said revolving member to said ends of said piston to seal the same again.

37. A rotary air or gas pump or en ine comprising a revolving iston device, a saft upon which it is secure' said shaft having a earing, said revolving device forming part of a circulatory system, means being provided to conduct liquid from the-interior of said revolving device' to its ends to seal the same, and said circulator system including leli-very side of the conduct the separated liquid back to said reyolving member; a duct leading from the outer' extremity of seid bearing beek to the 10W-pressure side of the pump or engine.

38. Arotery air or gas pump or engine, comprising e revolving piston device included in a circulatorysystem, Ineens being rovided to conduct liquid from the interior o seid revolving device to its ends to seal the same, and said circula-tory system also including b otli e separator at the delivery side of the Lpump or engine and means to collect and conduct the .separated liquid back to lseid revolving memb provided in said circulatory system lto open and close during the revolution of said (piston device to prevent Waste of sealing lui i FRITZ W. Witnesses :if i i 4 SAMUEL R; OGDEN,

PHILIP C. OSTERMAN.

er, and a valve device being i-

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