US2615399A - Rotary pump - Google Patents

Description

Oct. 28, 1952 M. G. EDWARDS ROTARY PUMP Filed Sept. 9, 1950 IN V EN TOR.

M700 ay [diva/d5 BY JA 7 7W ATTORNEYS,

Patented Oct. 28, 1952 s, PATENT ,orrlce, v

ROTARY PUMP Miloii G a jEdwardsJoplin, Moi, assignortofeefi l ess .Machinery' 00., Joplin, Mo.-,- a corporation AipplicatiomScptember 9, 1950, Serial No.183,-993

This invention, relates-L to. ma pumps an d more particularly torotary pumps. of the internal.

gear or rotor and idler.v pinion. type,v and .has' for:

its principalobje'ct toprovide apum'p of smaller increased ca acity; is obtained; by making the.

pumps larger in diameter-I.

Eurther. ObjGCtSQ f tl'ieIpresent inventiori are to provide a" rorary'pump of the internal gear;

type with;a rotor structureiandidlerf'pinion of longer' length in a smaller, lighter; moreserv'ice able pump than other such rotaryv pumps of equal capacity; to provide a pump of the'inte'rnal gear" type in which the. bars. ofthe' internal gear are supported at each end of'the rotor; to provide such a purnpwith asupporting bearing ring on the free ends of the internal gear or rotor teeth, said supporting ringhaving bearing contact with cooperating portions ofthe pump housing; and to provide a' pump of this'character which is economical to manufactureand-assemble, and efficient in operation overlong periods of use.

In accomplishing these and'other objects of the" present invention, I have provided improved details of structure; the preferredforms of-which are. illustrated in the" accompanying drawings,

Whgeim I Fig. 1 is a longitudinal sectional view of a pump embodying the featuieso f-"th'e present in- Fig; 2; is a' detailed disassembled perspective view of the rotor and supporting bearing ring therefor.

Fig. 3 is a transverse sectional view on the line 3-3, Fig. 1. v I

Referring more in detail to the drawings:

l designates a pump comprising a casing 2 having a cylindrical bore 3 which encloses an internal gear or rotor 4 in the form of a cage comprising bars 5 and spaces 6 between the bars 5. The rotor is secured as by a key I to a drive shaft 3 connected with any suitable prime mover to drive the rotor. The drive shaft is rotatably mounted in bearings S and 10 and passes through a packing gland H. The casing 2 preferably consists of a shell 52 open at each end, the open ends being closed by end plates l3 and i4 secured ampsr. trieiintermizgear;

to the shell by meansof'fas'tening' devices; such as screws l5.'- Gaskets [6 are interposed between theend' plates'andth'eshell' to'for'm a seal and each of'said en'dplates has annular shoulders I? which extendinand closely" engage the bore 3;

of the' shellifor centering the end plates on said shell. "The end plate 13' has an x n boss: is; extending-outwardly frorn'the casing andlsuitably bored to receive the bearing 9', packing- Wand packing gland H. Thb'oss also has an extension 20' spaced from thepacking gland and suitably bored to receivelthe bearing Ii! which is preferably of the antifriction adjustabletype,v the bearing 10 beingheld in the extensionby a suitable bearing retainer 2l and the' inner; race being adjustableby mie'ans'of nuts 22 andlocli; nuts'23'threaded on the" 'shaftt. The end'plate, I3 also has a depending portion 24 terminating in" a base plate 25 having" suitable apertures 26. for recewmgrastemngj devices for' securing the pump on any suitablesupport, aZbraceZT conmeeting the base plate" 25"with theboss extension" 20 tdcoo'perateviiith a'rib 28 to form a strong, rigidst'ructure.

e end plate tending intothef casing and'upon' which islr'otat ably ounted a toothed idler-sci saididlerkpref erably having a bushing 3| of suitabIeLb'earin'g material which operates on the" stub shaftjZB.

Theaxis of the stub shafti fi is ofiset relative to the axis of the drive shaft 8so thatthe maximum diameter of the idler 30L is considerably less than the maximumdiameter of the rotor 4,, said idler being located whereby the teeth 32. thereof enter the spacesv 6' between thebars 5 on one side of therotoriand the peripheries 353' oi the'te'eth engage the inner surface of the shell I 2" when said teeth extend their maximum .jdista'nce' into the spaces 6- of the rotor'l A crescent-shaped" to the end plate 14 and extending therefrom into the casing whereby the free end 35 of the crescent-shaped filler has sliding engagement with the adjacent face 36 of a solid, disk-like portion 31 from which the bars 5 of the rotor extend.

of substantially the same length as the bars 5 whereby the ends ofthe toothed idler slidably engage the face 36 of the disk portion-s1 of the marries a Santana" a:

filler 3'41 ans. the eccentric vI spacebetweeri' the other side? of Ithe idler 3 0 and 1 mner surface" o'f'th'e" bars 5 oftlie" rear" 4; as' illustrated in Fig. 3, said crescent-shaped filler being integral with or otherwise suitably fixed-- rotor 4 and the inner face 31' of the portion of the end plate l4 which extends into the shell l2.

A ring 38 is secured to the free ends of the bars 5, preferably by fastening devices, such as screws 39, which extend through countersunk apertures 49 in the ring and are threaded into threaded apertures 4| located centrally of the free ends of the bars 5'and aligned with the apertures 40., The outer periphery of the ring 38 is of the same size as the peripheries of the disk-like portion 31 and bars 5 whereby the ring slidably engages the inner surface of the bore 3 in the shell [2. The bore in the ring 38 is of such size whereby the inner surface 42 thereof coincides with the inner surfaces of the bars 5 and slidably engages a shoulder 43 formed by an undercut portion in the inside of the end plate I4, said undercut portion providing an extension on the end plate l4 and forming with the bore 3 an annular recess. The outer surface 44 of said ring also has sliding contact with the inner face 45 of the undercut portion of the end plate whereby the engagement of the ring with the end plate serves as a bearing support for the ends of the bars 5 of the rotor 4.

Also the ring connects the free ends of the bars, giving added strength thereto, whereby therotor may be longer than in conventional pumps to provideincreased capacity, or in other wordsthe pump is smaller in diameter than conventional pumps of equal capacity.

When the drive shaft 8 is operated todrive the rotor 4 in the direction of the arrow, Fig. 3, the rotation of'the rotor automatically rotates the idler 30'because of the engagement of the teeth 32 on the idler with the bars 5 on the rotor. As the rotor 4 rotates, the teeth 32 are withdrawn from the spaces 6 adjacent the inlet port 46 in the casing, This produces a partial vacuum which draws liquid into theinlet port and fills the spaces 6 in the rotor and-also the spaces 41 between the teeth 32 ofthe idler with the liquid. The liquid in the spaces 6 and 41 is retained therein by the crescent-shaped filler 34 until'the spaces 6 and 41 come into the area comprising the outlet port 48. 'As'the teeth 32 move to fit between the bars 5, the liquid in the spaces 6 and 41 is forcibly ejected into the outlet port,48. The pumpacts as a force pump whereby liquid going through the pump is forced out of the outlet port under substantial pressure," but the possibility of the high pressures damaging the rotor and bars thereof is greatly reduced due to the bearing supporting ring 38 reinforcing the outer ends of thebars 5 and supporting said bars on the shoulder and undercut portion in the end plate l4.

It is believed obvious that I have provided a rotary pump structure which will operate over long periods of time and'is adapted to be made.

longer than conventional. pumps to form a smaller, lighter pump anda more serviceable pump than others of equal capacity.

What I claim and desire to secure by Letters Patent is:

A rotary pump of the character described comprising, a shell having a cylindrical bore and an inlet port and an outlet port communicating with said bore, end plates sealingly secured to the shell and closing the bore atthe ends thereof, one of said end plates having 'a portion extending into the bore concentric thereto and forming an annular recess therewith, a drive shaft rotatably mounted in the other end plate axially of the'cylindrical bore, a rotor including a disk portion secured to the shaft adjacent said other end plate and having a plurality of peripherally spaced parallel bars extending from the disk longitudinally of the shell bore and terminating in free ends adjacent said one end plate, said disk and bars having peripheral bearing engagement with the cylindrical bore of the shell, a ring in the annular recess and having bearing engagement with the shell bore and said one end plate, means securing the ring tothe free end of each of the rotor bars whereby the ring connects'said bars and provides bearing support therefor on said, one end plate, a toothed idler member coextensive with the rotor bars, means on said oneend plate rotatably mounting the idler member inside of and eccentrically of the rotor whereby the teeth of the idler member mesh'with the rotor bars and extend through the spaces therebetween to engage the shell bore between the inlet and outlet ports, and a crescent-shaped member coextensive with the rotor bars and fixedto said extending portion of said one end plate and extending longitudinally of the shell bore between the inner surface of,

the rotor bars and periphery of the idler teeth and forming a seal therebetween whereby rotation of the driveshaft rotates the rotor and idler member and forcibly delivers liquid from the inlet port to the outlet port.

MILON GAY EDWARDS. REFERENCES CITED The following references are of record file of this patent;

UNITED STATES PATENTS in the Number Name 7 Date 1,496,737 Petersen June 3, 1924 1,787,543 Nichols Jan. 6, 1931 1,802,527 Nichols Apr. 28, 1931 1,972,565 Kempton Sept. 4, 1934 2,140,966 Nichols Dec. 20, 1938 FOREIGN PATENTS Number I Country Date 476,515 Great Britain Dec. 10, 1937

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