US1496737A

US1496737A - Rotary pump, motor, or engine

Info

Publication number: US1496737A
Application number: US565602A
Authority: US
Inventors: Peter C Petersen
Original assignee: Viking Pump Inc
Current assignee: Viking Pump Inc
Priority date: 1922-06-03
Filing date: 1922-06-03
Publication date: 1924-06-03
Anticipated expiration: 1941-06-03

Description

June 3, 1924 l,496,737

P. C. PETERSEN ROTARY PUMP, MOTOR, OR ENGINE Filed June 3, 1922 2 Sheets-Sheet 1l Z7 Z ZZ f-w /9 6 W l// /A f E sii /l im i Jun@ 3, 1924. 1,496,737

- P. C. PETERSEN ROTARY PUMP, MOTOR, OR ENGINE Filed June 5, 1922 2 Sheets-Sheet 2 gmantoz Fferfeiv,

@ Mw; @im

Patented .lune 3, 1924.

1,496,13 oFFlc.

C. PEIIERSEN, OF CEDAR-FALLS, IOWA, ASSIGNOR TO VIKING PUNT COMP OF CEDAR FALLS, IOWA.

ROTARY PUMP, MOTOR, OR ENGINE.

` Application led June 3,

To all whom t may concern.'

Be it known that I', PETER C. PETERSEN, citizen of the United States, residing at Cedar Falls, in the county of Black Hawk and State of Iowa," have invented certain new and useful Improvements in Rotary Pumps, Motors, or Engines, of which the following is a specificatlon.

This invention relates to improvements in rotary pumps, motors or engines and more articularly to that type of such mechanism including a pinion meshing with a rotor.

' The primary object of the invention is to improve structurally the details of certain features of apparatus shown in known prior patents and to provide improved elements capable of rendering the known constructions more practical.

A further object of the invention is to provide an improved pump, motor or engine that has a larger capacity for its size and is more durable and eicient; especially when pumping against highpres'sures.- l

With the foregoing objects outlined and with other objects in view, which will appear as the description proceeds, the invention consists inthe novel features hereinafter described in detail, illustrated in the accompanying drawings and more particularly pointed out inthe appended claims.

Referring to the drawings:

Fi re 1 is a vertical ongitudinal sectiona view of a pump constructed in accordance with the present invention. tiona view of the same.

Figure 3 is a transverse vertical sectional view taken through the inlet and outlet ports. -o

40 Figure 44 is a perspective view of one of the heads or end plates viewed on the inner side.

Figure 5 isa side view of the rotor. In the drawing, 1 designates a casing hav- @5 in a circular inner surface 2. An inlet port 3 1s provided at one side of said casing and an outlet port 4 is varranged at the opposite side of .the same. An abutment 5 1s arranged within the casing between said ports. The inner ends of the ports are enlarged as shown at 3 and 4". 'p

Two heads 5 of identically similar structure are provided for closing the ends of the casing and for other purposes as hereinafter described. A drlve shaft 6- is provided, and

Fi re 2 is a horizontal longitudinal sec-k l 1922. Serial N0. 565,602.

this shaft is mounted'in sleeve bearings 7 forming part ofthe heads. lThis shaft carries a spur pinion 8 which internally actuates a gear rotor 9. These elements together constitute and comprise a rotary pump of the internal gear type.

The two heads that close the ends of the casing, as before stated, are similar in con' struction and each consists of a flange or disk 10 provided with apertures 11 to re- 65 ceive bolts 12 employed in securing the head i to the casing. Extending inwardly from the disk is an annular shoulder 13 that fits for a short distance inside the casing in order to provide an absolute and perfect centering of a stub-shaft 14, in the casing 1. A suitable packing can be interposed between the ange 10 and the end of the casing 1. A cylindrical reduced ortion or stub shaft 14 projects inwardly rom the shoulder and serves as a part of the shaft which carries the rotor. A crescent-shaped `projection 15 extends in-'h wardly from said reduced portion, and is of such length that the crescente of vthe two heads, to end, and thus form one crescent-shaped member centrally located in the casing with reference to its length. It will be noted that the outer surface of the crescent forms a con- A tinuation of thesurface of the stub shafts S5 14, and the rotor moves on the stub. shafts and on the outer surface of the crescent.

Each of the heads carries one of the bearings 7 for the drive shaft and this bearing is o centerv relatively to thejl'ongitudinal e0 axis of the casing 1, but it centers with the inner surface of the crescent 15 and also with the inner 'surface 16 of the abutment 5 at a point midway between the ports. In other words, the inner surface of the crescent and a5' this point orlongitudinal line on the abutment are in a circle drawn from the axis of Ythe drive shaft. v l

The drive shaft 6 asses through both heads and one of said heads is rovided loo with a stuiling box 17 for the sha 6, the shaft projecting through said stuing box and being provided on the outside with 'the usual means (pot shown) 4.for applying powerl to said s aft. The bearing 7 on the 105 other head may be closed at its outer end and both bearin ma have the\ usual means (not shown for liibrication.

For heavy duty, the shaft may be ex l tended further outside ofthe heads to move tno when placed in the casing, meet end in bearings of any type, such bearings to be mounted on standards, with the casing between them, on a common base. Tn this form both heads are provided with studing boxes. Tt is understood that these last mentioned features are common in the art.

The drive shaft and pinion 8 may be made integral, or the pinion may be fastened to the shaft in any suitable manner. Tt will be noted that the pinion has teeth 18 that have concave sides 19, that is, they `are thicker near their outer ends than they are about halt way in towards `the hub. The corners 20 on the outer end portions of the teeth are slightly rounded as shown. This shape of the teeth furnishes means for insuring a good contact with the convex cogs, hereinafter described, of the rotor and tur- -ther insures a free and easy movement, slight friction and nearly noiseless running even at high speed.

The spaces 21 between the teeth are cut deeper towards the hub than is suiicient to give room for the cogs of the rotor. This construction is provided in order to permit the slight amountof, fluid impinged between the teeth ofthe pinion and the cogs of the rotor, when both are at the abutment 5, a free chance to move from one side of a cog to the other side of the latter, and thus avoid undue friction and possible water-hammer.

The rotor 9 is preferably constructed of two similar parts 22, each having cogs 23 of suitable length extending from a'. ring 24 that serves as a bearing for the rotor on the reduced portions or stub shafts 1li. The cog portion of the rotor travels on the outer side of the crescent 15. llt will be noted that the cogs 23 of the rotor have convex sides 25 which, as beforestated, are adapted to engage the concave sides 19 of the teeth of the pinion. The cogs of the two parts 22 of the rotor are joined and match end to end, as shown, and are fastened together by any suitable securing means, such as bolts, screws, rivets or the like, 26, in a practical manner to form one unitary element with the cogs 23 in the central partwith reference to the length of the rotor, and'v'a ring or main bearing ortion 24 at each of its ends. The peri liery ofthe rotor is in slidable contact wit the inner surface 2 ot the casing.

The enlarged ends 3a and d ot the

ports

3 and 4 extend the full length of the spaces between the cogsV 23, and'also extend circumferentially so that abouttwo spaces in the rotor are always open to each port, all the fluid must pass in and out through the spaces in the rotor as the rotor revolves, therefore, there must be adequate space between the rotor and the casing at the ports.

llt is obvious from the tore oing that in asmuch as the rotor is entirely enclosed in the casing between the heads, and the shaft Meara? 'has bearings ot equal diameter in both heads, and the inlet and outlet orts are located on the sides of the casing, t ere is no end thrust whatever in this machine.

Tn operation either port 'may be inlet or outlet depending only on the direction in which the shaft 1s turned.

Fluid is drawn into the rotor 9 through the spaces between the cogs in the same, when the teeth 18 of the pinion by revolving said port to port except along with the teeth and cogs past the crescent. l

Tt will be noted that the meeting ends ot the cogs are provided with tongue and groove joints 27 in order to prevent any independent movement between cogs which abut one another.

From the foregoing, it is believed that the construction, operation and advantages ot the invention may be readily understood by those skilled in the art, and it is obvious that various changes may be made in details illustrated without departing from the s irit o1? the invention as expressed in the-clalms.

What is claimed and desired to be secured by Letters Patent is 1. Tn combination, a casing member provided with a cylindrical inner surface, an annular open-ended rotor arranged in said casing provided with radially disposed longitudmal slots and cogs and having its periphery slidably engaging the inner surface of the casing, a shaft extending through said MID casing and having its axis arranged on cen= ter relatively to the axis of the rotor, a pinion on said shaft having teeth adapted to extend through said slots and engaging said rotor, cogs, substantially identical head members lll@ detachably connected to the ends of the casing member and each provided with aninwardly extending crescent-shaped elementl engaging the inner surface of said' rotor, said' crescent-shaped elements having theirI ends arranged opposite and in close proximity to one another, an inlet port extending through one of said members, and an outlet vided with a stubv shaft projecting into andforming 'an inner bearin for said rotor, and carrylng the crescent-s aped element, the outer surface of sald crescent-shaped element I forming a continuation of the outer surface than they are about half way to the hub, and

and each provide each tooth being provided with rounded corners from side to end.

'5. A combination as claimed in claim 1 in which the rotor cogs have convex side surfaces, and in which the pinion teethhave concave side surfaces adapted to contact with the side surfaces of the cogs.

6. In combination, an open ended casing providedl with inlet and outlet ports at its op osite sides and/having a substantially circu arinner surface, 'an annular open-ended driven rotor arran ed in said casing and slidably engagin t e inner surface ofi the latter, said rotor aving rings at its ends and being rovided with radial slots and cogs interme iate its ends, said cogshaving convex sideSuraceS, a pinion arranged in said casing and rotor and having teeth adapted to roject through said slots and provided wit concave side surfaces adapted to contactwith the convex sides of the cogs in said rotor, a driving shaft fixed to said pinion, and heads closln the ends of said casing d with an inwardly extending'stub shaft terminating in a crescentshaped memher arranged between said peimon and said rotorand forming an inner aring for the' rotor.

7 In a machine of rotor consisting of an open-ended hollow barrel with spaces cut out longitudinally in oints.

the class described, al

the central part forming -cogs between, and. said cogs bemg joined together at each end by a ring,l said rotor being formed of two similar parts, and the meeting ends of said cogs being provided 'with tongue and groove 8. A machine of the class described including a casing of substantially cylindrical shape provided at opposite sides of its periphery with inlet and outletports, a support for said casing, the interior of said' casing and the inner end of said support forming a cylindrical surface, an annular open-ended rotor arranged in said casing and engaging said cylindrical surface throughout the length of the rotor, said l rotor consisting of end rings each having spaced cogs projecting from one side thereof, and means connecting the cogs of the two rings together, detachable end plates for said casing, each end plate having a cylindrical shoulder engaging the cylindrical surface of the casing` and support, a smaller cylindrical shoulder projecting inwardly from'the rst mentioned circular shoulder, engaging one of the rings of the rotor, and forming an inner bearing for the latter, a crescent-shaped member integralwith the smaller circular shoulder and engaging the inner surfaces of certain of lsaid cogs, each of said end plates being provided with an eccentrically'l arranged bearing aperture, the' 'inner surface of each of said crescent-shaped members being on the arc of a circle having 75 its center at the axis of said bearing aperture, and a pinion engaging said cogs and the inner surfaces ofl the crescent-shaped v members and provided with a shaft extending through said bearing aperture.

In testimony whereof I aiiix m signature.

PETER C. PE ERSEN.