US2195886A - Rotary pump - Google Patents

Description

April 2, 1940. .1. B. HAwLEY, JR 2,195,886

Ap y2, 1940. .1. B. HAwLEY, JR

'ROTARY PUMP Filed Dec. 11. 1936 wm/Z, pff M f 4 sneets shee,c 3

J. B. HAWLEY, JR

ROTARY lPUMP Filed Dec.. 11`1936 I .I Il uw.

J. B. H'AwLEY', .IRA

ROTARY PUMP Filed Dec. 11, 19:56

April 2, 1940.

4 SheetlS-vSheel; 4

Patented Apr. 2, 1940 PATENT OFFICE EOTARY Pm John B.' Hawley, Jr.,

Minneapolis, Minn., as-

signor to Reconstruction Finance Corporation,

Minneapolis, Minn., United States a. corporation of the' Application December i1, 193s, serial No. 115,363

Z2 Claims.

carrying the same, the bearings for said shafts' and the driving means for said shafts being carried in a casing, which casing is divided along a plane passing approximately through the centers of said shafts whereby the discharge side of said casing can be bodily removed from the inlet side.

It is another object of the invention to provide a rotary pump comprising a casing having a shaft journaled therein, a rotor secured to said shaft and rotatable in a chamber in said casing and means for packing said shaft to preventv leakage from said chamber including a sleeve tightly fitting said shaft and having a driving connection therewith at one'end.

It is still another object of the invention to provide a rotary pump comprising a casing having connecting chambers therein of semi-cylindrical form, the centers of said chambers being spaced a distance less than the diameter of one of said chambers together` with a novel construction of lining for said chambers.

It is another object of the invention to provide a rotary pump comprising a casing, shafts journaled therein, interacting rotors on said shafts, l bearings for said shafts carried in said casing, driving gears forpsaid shafts,'a driving shaft for said gears, bearings for said driving shaft, an,

oil pump and means for driving said oil pump from one of said shafts disposed at one end of said casing and an auxiliary casing enclosing said means whereby all parts are enclosed and oil can be distributed thereto.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings, in which like reference 50 I'characters refer to similar parts throughout the' several views and in which- Fig. 1 is a'view in side elevation of said pump Vsome parts being broken away and others .shown ',"inye'rtical section;

` Fig. l2 is a partial view showing afvertical sec- (Cl. 10S-126) tion through one end of the casing and illustrating the oil pump and driving means therefor;

Fig. 3 is a view in end elevation of the pump, a small part being broken away and another vpart shown in vertical section;

Fig. 4 is a view for the most part'in central horizontal section throughl the driving shafts and rotors; the upper half of the casing being removed;

Fig.r5 is a centralvertical section taken on line 5 5 of Fig. 1 as indicated by the arrow;

Fig. 6 is a partial view similar to Fig. 5 illustrating the lining for the rotor chamber;

Fig. 7 is a vertical section taken on line 1 1 of Fig. 8 as indicated by the arrow;

, Fig. 8 is a partial view similar toFig. 4 shown on an enlarged scale; v

Fig. 9 is a-vertical section takenuon line 9-9 of Fig. l as indicated by the arrow; and

Fig. 10 is a partial view in side elevation of a liner member used. I

Referring to the drawings, a pump is shown comprising a casing designated vgenerally as Ill. Casing Ill has a base flange IIla which rests upon the floor or supporting surface. Above flange IIJa are three cylindrical portions I0b extending in directions at right angles to each other and each having a surrounding and projectingange I0c to which will be connected the supply members for the liquid to be pumped, which members may be connected to'anges Ille by bolts 'passing through holes -IIld. One of the flanges Ille faces toward one end of the pump and the other twoy flanges I 0c face respectively toward opposite sides of the pump. Frame IU extends upwardly and has a horizontal flange Ille disposed some distance above the flanges IIIc. The frame portion I Il has an interior chamber If into which extend the cylindrical passages through portions IIlb. A screen member II formed of comparatively large wire and of rather coarse mesh has bushings IIa secured to its 'end portions, which bushings are fitted into the passages in portions Illb. A similar screen I3 has a bushing I4 secured to its end. tted in the other portion IIlb, which screen I3 extends to and is connected to screen II. Another screen I2 of the tray type may b used above screens I I and I3. Screen I2 is supported in guideways formed by vertically spaced flanges vI 0h on the inner side of member I 0. Said screen comprises side members I2a shown as made of pipes and transverse spaced members 12b shown as wires or rods secured in members I2. A coarse screen is carried by members I2a and u i2b. Member l@ is provided with openings through which the screen l2 may be inserted or removed. "These openings are closed by cover members or plates li. Screens li, l2 and i3 are preferably made of brass. A frame member i5 is disposed on the top of flange ille centrally thereof and members i6 and il constituting lower frame and bearing' bracket members are disposed on flange le at each side of member 45. Members I5, I6 and lll have base flanges which are secured by a large number of bolts, some of which are shown as lil, to flange lue. Memberi5 also 4has side flanges engaged by side flanges on members i6 and lll and said flanges are connected by a large numberY of bolts, someof which are shown as I9. Member l5 has therein the lower portions of semi-cylindrical chambers la and said frame member I5 as well as members i6 and il have upper flanges, the top surfaces of which are disposed in a horizontal plane passing substantially through the centers of chambers 15a. Members i6 and il have outwardly extending side flanges iSa and ila supporting vertical flanges 1Gb and Hb, the latter also having horizontal flanges at their tops with top surfaces in the same plane as the top surfaces of the flanges on members l5, A frame member 20 forming a central top chamber and 'discharge 'member rests upon frame member I5 and has a bottom flange connected to the top flange of member 'i5 by quite a large number of bolts, some of which are shown as 2l. Frame member 2G has therein the upper portions of the semi-cylindrical chambers iba and a discharge chamber or passage 20a extends upwardly from said chambers through member 2D. Member 2B has a cylindrical ange 28h at its top with a top horizontal surface to which will be connected the pipes or other members to which the liquid is discharged. Chamber 20a has lateral outlets 23o which may be used as discharge outlets if desired. If not so used they will be closed by cover plates which will be bolted to the finished at sides of the casing about openings 29o. The openings 20c also constitute inspection openings through which the rotors 42 may be seen and inspected. It is obvious that a lamp can be placed through the opening 20c into chamber 20a so that such inspection can be made. At the opposite sides of frame member 23 are frame members 22 and 23. The frame member 2D has side anges and members 22 and 23 constituting upper frame and bearing bracket members have flanges engaging said ride flanges and connected thereto by quite a large number of bolts, some of which are shown as 2. Members 22 and 23 each have outwardly extending ribbed portions 22a and 23a at the outer ends of which are anges 22h and 23h. The outer surface of flange 22h is in the same plane as the outer surface of ange lb and the outer surface of flange 23h is in the same plane as the outer surface of flange Hb. Portions 22a and 23a also have bottom anges 22C and 23o resting on the anges at the top of members lh and l'lb and connected thereto by the bolts 2li. Another frame member 25 forming the lower main gear casing section has a base flange 25a resting on a ange I 0g disposed a short distance above flange Illa. Flange 25a is connected to ange lily by bolts 26. Member 25 has a top flange, the top surface of which is in the same plane as the top surfaces of the anges at the tops of members i5, i8 and il. The plane at the tops' of these flanges is indicated in Fig.

I6 and 11:

aieaees 1 by the line 2li. A frame member 28 forming the upper main gear casing section rests upon frame member 25 and has a bottom flange connected to the top flange of member 25 by the bolts 23. Members 25 and 28 have at one side flat vertical surfaces disposed in the same plane and which are engaged by the flanges |61) and 22h respectively. Flanges |617 and 22h are connected to members 25 and 28 by the ybolts 30. Member 25 has a ange 25h at one side having a Hat vertical outer surface engaged by the outer surface of a flange 3io, of a member 3l forming the lower auxiliary gear casing section and connected thereto by the bolts 32. A frame member 33 forming the upper auxiliary gear casing section has a bottom flange resting upon a top flange of member 3l and connected thereto by bolts 34. These latter flanges meet in a plane which is the same plane as indicated by line 2 in Fig. 1 and in. which plane the top surfaces of members i5, i6 and il are disposed. Frame member 33 has a flange at one side engaging the vertical surface of a side flange on member 28 and connected thereto by the bolts 35. rihe various frame members described which are bolted together are carefully and accurately finished and located in position by dowel pins. Members i1 and 23 are bored to receive ball bearings 36 in which are journaled shafts 31 and 38. Said shafts have reduced threaded portions at their ends receiving threaded collars 33 engaging the ends of bearings 36. Members I6 and 22 are bored to receive ball bearings 40 in. which shafts 31 and 38' are also journaled. Said shafts have threaded portions adjacent the bearings 40 on which are screwed the collars il engaging the ends of bearings 40. Shafts 31 and 38 are thus held from any substantial longitudinal movement. Shafts 31 and 38 have keys 31a and 38a therein shown as four in number and rotor members d2 are bored and splined to receive said shafts and keys and thus be secured to said shafts. Rotors 42 have therein circumferentially spaced substantially semicylindrical recesses or pockets 42a between which are the radially extending portions or projections l32b. The outer surfaces of portions 42h are in the surface of a cylinder substantially engaging the inner surfaces of lining members 43 disposed in the chambers Iba. The shafts 31 and 38 have their centers spaced a distance considerably less than the internal diameter of the liner members 53. The liner 4members G3 are thus of substantially semi-cylindrical shape and the same have surfaces meeting in a vertical plane midway between the axes of shafts 311 and 33. Said liner members are connected so as to form one integral member by being brazed or welded together, some of the brazing or welding metal being shown at 63a. Said liners are also divided on planes adjacent line 2l, the divisions as shown in Figs. 5 and 10 extending in a plane making a slight angle with the horizontal. End plates Q8 are positioned in the ends of chambers a and as shown in Fig. i these are disposed within the ends of liners i3 and act to support said liners. Members "lli are secured in place by screws d8a extending therethrough into members 22 and 23. The liner members i3 and members 48 will be made of bronze or some similar comparatively soft metal. The rotors @l2 have disposed in portions Eb thereof adjacent each end of the rotor, tubes lil. Tubes 45 having semi-cylindrical closed outer ends are slidable in tubes 44 and a coiled compression spring 45 is disposed in said tubes engaging member 42 at one end and tube 45 at its other end. The projections 42b are provided with central slots 42e at their outer sides, which slots have an inner cylindrical portion 42e. Bars 41 fit in said slots and have inner semi-cylindrical portions 41a disposed in portions 42c but of somewhat smaller diameter than the latter. Bars 41 can thus have some inward and outward movement in said slots. Said bars 41 adjacent their ends are cut away as shown at 41b and the tubes 45 'project into the space in the bar thus formed and engage the inner side of the bar as shown in Figs. 7 and 8. Springs 45 thus act to move bars 41 outwardly. The sides of the projections 42b are further provided with teeth 42d.

The linings 43 have openings 43e at their upperv sides through which the oil.or other liquid is discharged into the chamber a andsaid members have openings 43h at their bottoms through which the oil or other liquid pumped passes to the rotors from chamber |5f. Frame membersv I1 and 23 are provided with bores through which shafts 31 and 38 project from the rotor chambers |5a. Frame members I5 and 22 are also provided with bores through which said shafts extend at the outer sides of the rotor chambers |5a. Shafts 31 and 35 have sweated thereon sleeves 45. In practice these are made of stainless steel and the inner vends of said sleeves project some distance within the rotor cham\ bers and into bores formed in the ends of the rotors, said sleeves having splines or slots 45a in said inner ends into which extend the keys 31a and 38a formed lon said shafts. Sleeves 45 will thus rotate with said shafts and rotors. The inner ends of said sleeves are also provided with small annular slots 45b and the metal of the surrounding rotor is swaged into said slots. The sleeves 49 extend outwardly through the bores in the frame members and are surrounded by rings of packing material 55. A packing gland 5| which is made of steel in order to get the requisite strength and rigidity has a bronze lining 52 throughout its bore and extend- 4ing across its inner end and said gland extends into the bores of the frame and engages the packing 55. The glands 5| extend at opposite sides of the shafts as shown in Fig. 9, the same being centrally and longitudinally split and having end bosses connected by the headed and nutted bolts 53. Headed screws or bolts 54 extend centrally through the glands within the end lugs and are threaded into the frame for forcing the glands 5| against the packing 55. A tight fit is thus had about the shafts and a seal from the rotor chamber provided." Should any wear occur on the sleeves 45 said sleeves 'can be removed and replaced .without changing the shafts.

lars 4|.shafts 31 and 35 have tapered portions i.

with keys therein and have secured thereto the lgears v55 and 5|, which gears are of the same size and mesh with each other. Said shafts Ahave threaded portions beyond said gears onwhich are screwed the collars 52 engaging the outer sides of gears 55 and 5|. Shaft 31 terminates with said threaded portion but shaft is continued therebeyond and has another tapered portion 35h towhich is keyed the hub of a gear 53. Clearl 53 is of the helical type having spaced tooth portions 53a with which mesh pinions. 54 secured to a driving shaft 55. Driving shaft 55 is carried in ball bearings 55 disposed in bores in frame members 25 and 33 respectively. Frame member 25 has a hole or bore 25a provided for construction purposes and which is closed by a plate 55 secured tol saidframe. by bolts 55a. A stumng i Shaft 55 extends beyond stuing box 1| and is adapted to be driven by some suitable source of power. In Fig. 1 said shaft is shown as having a coupling 51 secured thereto also secured to a driving shaft 51a which will be driven from some exterior power unit. Shaft 38 is provided with a threaded portion beyond gear 53 on which is screwed a collar 13 engaging the outer side of gear 53. Frame members 3| and 33 are bored to receive ball bearings 14 in which shaft 38 is journaled. A bearing cover plate 15 is bolted to the outer side of frame members 3| and 33 by the bolts 15. Shaft 35 projects beyond frame members 3| and 33 and has secured thereto a sprocket member 11. A chain 15 runs over sprocket member 11 and over a, sprocket member 15 securedto the driving shaft of an oil pump 85 having a flange 55a secured to the lower part of frame member 3| by the bolts 8|. Pump 55 has an inlet conduit 55h which carries a screen member 52 through which oil must pass going into said pump 55. 'I'he outer end of pump 80, the end of shaft 35, sprockets 11 and 15 and chain 15 are enclosed by a casing 83 having a surrounding flange 83a bolted to the end of frame members 3| and 33 by the bolts 54. 'Ihe chamber in frame members 25, 25, 3| and 33 which contains the gears 55, 5|', 53 and 54 is adapted to contain oil to a. considerable height substantially to the level indicated by line 85 in Fig. 2. A casing 55 is bolted to the end of the casing or frame opposite that having casing 53 thereon :and thiscasing forms a chamber 85a at said end of the casing. Frame member 25 has inspection holes in opposite sides thereof closedv by cover plates 51 secured thereto by the bolts 58. An apertured lug 3|b is formed at the lower portion of frame member 3| and has therein a plug 89. This opening is provided for draining the oil chamber by means of a hand pump.

Casing member 53 has a projecting boss 53b vthrough which passes a pipe 55, the top of the boss being tightly sealed around said pipe by a plate 5| bolted to said boss. Pipe 55 has connected thereto another pipe 92 which extends to a sight glass cup 53 having a discharge pipe 54 extending into an apertured boss 53o at` the top of casing 53. vA hand valve 55 is disposed in the pipe 52. VAnother pipe 55 extends from pipe 95 to a sight glass lcup 51 having a discharge pipe 55 extending into an apertured boss 33a on frame member 33. Pipe 55 delivers oil to bearing 55 and shaft 55 as well as to the gears 54. A hand valve 59 is disposed in the pipe 95.` A pipe|55 leads from pipe 55 and delivers ollthrough a boss 33h in frame member 33 to the other bearing 55. A relief valve |5| is disposed in pipe |55.l

Another pipe |52 has branches extending to sight glass cups M33 having discharge pipes i865 extending into the frame member, 23 and delivering oil to hearings 36. 'A hand valve i05 is shown as disposed in pipe HG2. Eipes iB extend from the sides of casing 86 being connected in the outer threaded Yportions of bores 88h and these pipes extend to and discharge into the chamber in frame member 25. A pipe H01 extends from ipe 90 to a sight glass cup E08 which has a discharge pipe M39 extending into a pipe assembly i lll discharging into the top of casing 28 and onto gears S6 and 63. An elbow member Hl is secured to the top of assembly i l and has an open end forming a vent. A hand valve M2 is disposed in pipe lG'J.

In operation of the pump the same will be driven through the coupling member 61 which will drive shaft 65. pinion Sli so that shaft 38 is driven. Shaft 37 is driven through gears 60 and 6l so that the rotor members d2 are driven in -opposite directions. As therotor members revolve the bars or blades W are held out against" the inner surfaces of liners t3 and the oil to be pumped which enters through the screens H and I3 and rises in chamber 40j is moved by the projections 42h and carried upwardly past the rotors. The blades il enter the recesses 62a and the teeth 42d enter the recesses of the other rotor at the upper sides of said teeth. The oil is thus moved in the Well known manner of such pumps. The oil may be discharged under considerable pressure, the pump illustrated in practice being designed to deliver the oil discharged at a pressure of 100 pounds per square inch. 'I'he casing for the pump as stated is divided along a horizontal plane passing substantially through the centers of shafts 31 and 3B. With this construction the bolts securing the casing together at this plane may be removed and the upper half of the casing lifted bodily from the lower half. This gives access to the shafts, bearings and rotors so that any changes or repairs can be easily and quickly made. It will also be seen that the various sections of the frame can be unbolted and separately removed. Thus members 22 and 23 can be separately removed or the central section 2Q can be removed.

This is a great advantage as the pumps are used largely in ships such as tankers and are disposed in the hold. It is a very desirable feature that the different frame and. bearing members as well as the different parts of the gear casing, such as parts 25, 28, 3i and 33, can be separately removed. By having the split packing glands i they can be manipulated in a much smaller space than if the glands had continuous anges. The portions 5i of the glands are preferably made from stainless steel having a high modulus of elasticity. The bronze bushing 52 forms the bearing and has, as is well known, small frictinal resistance. If the whole gland were made of bronze it would not be suiciently strong and the ange would bend under stress of bolts 5d. l'f enough metal were used to give suicient strength the gland would have too great dimensions and would be objectionably large necessitating a longer frame and longer rotor shafts. By providing the casings 33 and 86 all parts including the lubricating parts are enclosed and ali are contained in an oil chamber. The oil levelin the chamber in casing 85 will be maintained at or above the centers of shafts Si! and 38. The lubrieating pump il@ pumps oil from the bottom of thef. chamber in casing portions 25 andii and Gear E3 will be driven by' as well as the bearings 1li. The oil after being delivered to the chamber 86a drains back therefrom into the main oil chamber in casings 25 and 3l through pipes |06. The pump is thus lubricated in all necessary parts by an oil pump enclosed therein and driven by its own parts. The sprockets Tl and 'i9 and chain 'i8 are also well lubricated as the lower part of the chain 18 and sprocket 'i9 are disposed in oil. Attention is called to the fact that should the oil pipe lines communicating with relief valve IDI become clogged so that said valve IOI would operate, oil would be delivered to gears 63 and 64 through pipe 00. This oil would also reach bearings 66. There would thus not be a stoppage of the oil circulation. The construction of the liner members i3 is quite efficient. It is also important to have the liners connected to `maintain proper relation thereof to the rotors. 'Ihe provision of sleeves 39 makes possible an efcient packing method or seal for the rotor chambers and any wear of rotation is taken by the sleeve, which sleeve can be readily replaced. As stated, no change is then necessary' in the shaft. 'Ihe greatest stress on the shafts 31 and 38 occurs just at the ends of the rotors. If the shafts corrode at this point they are apt to fail. In practice two shafts six inches in diameter made of stainless steel became corroded and cracked at the ends of the rotors. By providing the sleeves 89 the corrosion at this point is prevented so that the shaft is protected at-the point of greatest stress.

From the above description it will be seen that applicant has provided a very elcient and improved structure of pump. The pump must be very accurately and strongly made. The same has been amply demonstrated in actual practice and found to be very successful and eicient.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth in the parts and combinations of parts disclosed and defined in the appended claims.

V/hat is claimed is: 1: A rotary pump having in combination, a casing, a pair of parallel shafts disposed in said casing, bearings for each shaft spaced longitudinally thereof and carried by said casing, interacting rotors secured to said shafts, said casing having mating semi-cylindrical chambers for said rotors, gears secured to said shafts and meshing with each other, a driving gear secured to one of said shafts, a pinion meshing with said driving gear, a shaft carrying said pinion, bearings in said casing at each side of said pinion for said latter shaft, said casing having an inlet opening at one side of said rotors and an outlet opening at the opposite side of said rotors, said casing having a chamber in which said gears, driving gear and pinion are disposed, said casing and bearings being divided along a plane passing substantially through the centers of said three shafts to form two units whereby the portion having said discharge outlet therein may be separated as one unit bodily from the portion having said inlet opening therein and means connecting the two portions of said casing together.

2. The structure set forth in claim l, the upper part of said casing being divided into separately removable parts along vertical spaced planes.

8. A. rotan-7 pump having :in combination. a

casing, parallel shafts disposed therein one of which constitutes a driving shaft, bearings for each shaft spaced longitudinally thereof and supported in said casing, interacting rotors secured to said shafts respectively, semi-cylindrical chambers in which said rotors are disposed and said gears, driving gear and pinion are disposed.

an oil pump disposed in the lower part of said casing, means without said casing connected to said driving shaft and oil pump for driving the latter, a casing enclosing said means and secured to said first mentioned casing having a chamber therein communicating with said first mentioned casing, a casing secured to said first mentioned casing at the opposite ends. of said shafts and having a chamber therein communicating with said first mentioned casing, oil being maintained in said first mentioned casing and means connected to said oil pump and connected to said first mentioned casing for distributing oil to the bearings therein and to said last mentioned chamber.

4. A rotary pump having in combination, a casing having rotor chambers therein, interacting rotors in said chambers, shafts to which said rotors are secured, gears connecting said shafts, one of said shafts having a large gear connected thereto, a pinion for driving said large gear, a shaft carrying said pinion, said casing having a chamber therein enclosing said gears, said casing being divided about a horizontal plane passing through the centers of said vshafts and about a .vertical plane passing through said large gear whereby the same is in four parts, said parts being separately removable.

5. A rotary pumpv havingl in combination, a casing, a pair of parallel shafts disposed in said casing, bearings for each shaft disposed longitudinally thereof and carried by said casing, interacting rotors secured to said shafts, one o f said shafts extending beyond said casing, and driving means connected to said shaft beyond said casing, an oil pump disposed in saidcasing, a driving shaft for said oil pump extending beyond said casing, a driving element secured to said last mentioned shaft without said casing anddriven by said driving means andra second casing secured to said first mentioned casing and enclosing said one shaft and driving means.

6. A rotary pump having in combination, a casing, a pair of parallel shafts disposed in said casing, bearings for each shaft spaced longitudinally thereofand carried by said casing, interacting rotors-secured to said shafts, semi-cylindrical chambers for said rotors, gears secured to I said shafts and meshing with each other, a drivlast mentioned chamber, a driving shaft for said oil pump projecting beyond said casing, a driving element for said oil pump secured to said last mentioned shaft and driven by said driving means and a casing enclosing the projecting portion of said shaft andv driving means.

7. A lining for a rotary pump having connecting semi-cylindrical chambers adapted to receive rotors, comprising adjacent semi-cylindrical shells having surfaces meeting in a plane midway of said chambers and being rigidly connected at said meeting point, said shells having free edges in planes adjacent a planepassing through the `axes of said chambers.

8. A rotary pump having in combination, parallel shafts, coacting rotors secured to said shafts, semi-cylindrical chambers in which said rotors rotate, the axes of said shafts being spaced a' distance smaller .than the diameter of said chambers, linings for said chambers meeting in a plane midway between the centers of said chambers, said linings being rigidly connected by metal secured thereto disposed adjacent said plane and being divided along planes adjacent the plane passing through the axes of said rotors whereby said linings may bey conveniently assembled and disassembled.-

9. In a rotary pump having connecting semicylindrical chambers, a lining adapted to receive rotors comprising adjacent semi-'cylindrical shells of substantially uniform thickness radially having their axes spaced a lesser distance than 'the diameter of said shells and having surfaces parallel to their axes meeting in a plane midway of said chambers, said shells being rigidly welded together at said meeting plane whereby the inner surfaces of said lining are parallel to the walls 'of said chambers, said lining having free edges adjacent the plane passing through the axes of said chambers.

.10. A rotary pump having inv combination, a 'I rotor'member, a semi-cylindrical chamber inA which said rotoris disposed, said rotor having circumferentially spaced projections with radial slots etxending therein from their outer sides, said'slots having enlarged semi-cylindrical inner ends, bars of comparatively soft metal disposed in said slots and having semi-cylindrical inner ends disposed in said semi-cylindrical portions of said slots and of smaller diameter than said portions and resilient means normally urging said bars outwardly.

12. The structure set forth in claim 11, said last mentioned means comprising telescoping tubes and a spring urging one of said tubes against said bar, said bar having a recess adjacent one end into which said tube extends.

13. A rotary pump having in combination, a casing, a pair of parallel shafts disposed in said casing, interacting rotors secured respectively to said shafts, said casing having a chamber in which said rotors are disposed having inlet and outlet passages at opposite sides of said rotors respectively, bearings for said shafts at `one side of and outside of said chamber, gears secured to said shafts meshing with each other, e. driving gear secured to one of said shafts, a pinion meshing with said driving gear, said casing having a chamber in which said gears, driving gear,` and pinion are disposed, bearings for said shafts adjacent one side of and communicating with said last mentioned chamber so as to be lubricated by oil therein, a bearing for said one of said shafts at the otler side of said last mentioned chamber and communicating therewith, said casing being divided along a plane passing through the axes of said shafts to form two rigid units, the upper of said units being bodily removable whereby said shafts with said gears and rotors and bearings may be removed.

14. The structure set forth in claim 13 and a shaft carrying said pinion, spaced bearings for said latter shaft disposed at either side of said last mentioned chamber and communicating therewith. 1

15. A rotary pump having in combination, a casing, a pair of parallel shafts disposed in said casing, said casing having semi-cylindrical chambers therein, interacting rotors secured to said shafts and disposed 4in said chambers, gears secured to said shafts and meshing with each other, a driving gear secured to one of said shafts, a pinion meshing with said driving gear, said casing having a chamber in which said gears, driving gear, and pinion are disposed, a`shaft carrying said pinion, bearings for said first mentioned shafts at one side of said last mentioned chamber and communicating therewith, and a bearing for said one shaft at the other side of said chamber and communicating therewith, said casing being divided into two rigid units along a plane extending through the axes of said shafts, the upper of said units being bodily removable.

16. The structure set forth in claim 15 and bearings for said last mentioned shaft disposed at either side of said chamber and pinion and communicating with said last mentioned cham` ber.

17. A rotary pump having in combination, a casing, said casing having mating semi-cylindri- 'cal chambers therein, a pair of-parallel shafts disposed in said casing to which said rotors are respectively secured, an outlet passage leading from said chambers above said rotors, an inlet passage leading downward from said rotors, said casing having a slot in the side thereof communicating with said inlet passage, a screen extending across said inlet passage and removable through said slot, cylindrical inlet passages at either side of said casing communicating with said first mentioned inlet passage, and a cylindrical screen secured in said cylindrical passages and extending between the same and thus across said rst mentioned inlet passage.

18. In a rotary pump having connecting semicylindrical chambers, a lining for said chambers having an outer surface fitting against the walls of said chambers and an inner surface parallel to the walls of said chambers, said lining having surfaces meeting in a plane perpendicular to a plane passing through the axes of said chambers and midway of said axes, said lining being formed aieaeee y as a rigid unit at said meeting sinfanes and having free edges in planes adjacent said plane passing through the axes of said chambers and at an angle thereto.

19. A rotary pump having connecting semicylindrical chambers, lining members for said chambers each comprising a pair of semi-cylindrical shells having inner and outer surfaces parallel to the walls of said chambers and having edges meeting in a plane extending perpendicular to a plane passing through the axes of said chambers and midway between said axes, said 'shells being rigidly secured together at said meeting planes, said linings each having free edges at the remote sides of said chambers extending in planes adjacent said plane passing through the axes of said chambers, said chambers having end walls perpendicularto said axes, end lining plates within said first mentioned linings and supporting the same disposed against said end walls and screws securing said end plates to said end walls.

20. A rotary pump having in combination, a casing, said casing having mating semi-cylindrical chambers therein, a pair of parallel shafts disposed in said casing to which said rotors are respectively secured, an outlet passage leading from said chambers above said rotors, an inlet passage leading downward from said rotors, said casing having a slot in the side thereof communicating with said inlet passage, and a screen extending across said inlet passage and removable through said slot, said casing having slots at opposite sides in which said screen is slidable.

21. A rotary pump having in combination, a casing, a pair o'f parallel shafts disposed in said casing, bearings for each shaft spaced longitudinally thereof and carried by said casing, interacting rotors secured to said shafts, gears secured to said shafts and meshing with each other, a driving gear of large diameter secured to one of said shafts, a pinion meshing with said driving gear, said casing having a chamber adjacent one end and an outer end wall in which chamber said gears, driving gear and pinion are disposed, said chamber being adapted to contain oil, a chamberforming casing secured to said wall into which 'said shaft carrying said driving gear projects, an oil pump in said last mentioned chamber having a shaft projecting into said last mentioned casing, a driving means connecting said last mentioned shaft and said shaft carrying said driving gear, said last mentioned casing being adapted to contain oil for lubricating said driving means.

22. A rotary pump having in combination, a driven shaft, a rotor connected to said shaft, a chamber in which said rotor is disposed having an end wall with an opening through which said shaft projects, a sleeve tting on and secured to said shaft and extending a. short distance through said end wall and a short distance into said rotor, a cylindrical recess about said sleeve and means for packing said recess, the metal of said rotor extending into said sleeve.

JOHN' B. HAWLEY. JR.

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