US1913758A - Rotary pump - Google Patents

Description

.June 1933. v vD. N. HuKnzs l 1,913,758

ROTARY PUMP Filed Jan. l0, 1930 2 Sheets-Sheet 2 ,272 vez? for.

i Patented June 13. 1933 'l UNITED STATES PATENT #OFFICE nnlrrm n. narxmsgor meneame. cama-orma, assmnon or TWENTY .ran CENT To msnm' a, xmas, or Los ANGELIS, cannromua, .um TEN ran. cENT To chaman I.. or Los ANGELES, cALnronimi i ROTARY PUIP Application alec January 1o, mac. serial manana.

.This invention relates to rotary umps,

compressors, superchargers .and the l' e, and

has for its general purpose to provide a simply constructed mechanism of this character aving a large pumping capacity, and ca y pable of com ressing fluids in single stage operation, to i h pressures.

The present orm'of pump mayY bejcharacterir'ed in general as comprising a rotor' body;

peripheral clearance space between the casing and rotor. The `rotor -is`positione'd in the casing so as` to be substantially in engagement with the inner wall thereof at one point, there of course'being a point of maximum clearance between the rotor and casing diametrically opposite the Yint of closest proximity of the rotor to vt e casing The fluid istaken into the clearance space at thel point of maximum clearance, and is then" compressed in advance of the impellers and discharged from the clearance space as the impellers travel to the. point lof minimum clearance. The discharge from the fluid l under oing'compression' occursby way of rts ormedfinl the casing and communicatmg with the compression space between the rotor and casing. According to my preferred construction, the discharge port ary rangement comprises a series of lateral ports 'opening' from the periphery through the sides of4 the rotor and registering, throughout the period of compression, wlth ports in the casing end plates, throughv which the fluid is dischar ed into exhaust passagesat opposite end's c the casing.`

It may be mentioned that the present form.

of pump is similar in certain respects, particularly with regard to the construction of the rotor, to the'type of engine described in my cepending application on Rotary' engine, file January 10 1930, Ser. No..419 843.

Further objects and 'haracteristics of the present invention, as well as the various details thereof, will be most readily understood from the following detailed description vof a typical form of pump illustrating a preferred embodiment of the invention, reference be-` ing had for purposes of description to the annexed drawings, in which:

Fig. 1 is an end view of the pump with the end closure of the casing removed, a porv tionofthe rotor and casing being shown in medial section;

Fig. 2 is a section on broken line 2-2 of Fig. 1, y a

Fig. 3 is a perspective View of the rotor Fig. 5 is a section on line 5 5 of Fig. 2

showing particularly. the exhaust port arrangement in the casing end plate;

, Fig. 6 is a detailed sectional view of one of the rotor blades; and

Fig.' 7 is a fragmentary end view similar to that portion of Fig. 1 shown in elevation, illustrating a variational form ofport arrangement. 4

Referring first to Figs. 1 and 2 of the drawings,the rotor casing comprises a cylindrical shell 10 having an integral base portion 11, there being a pair of end closures or plates 12 and 13 secured to the shell by screws 14. The pump rotor, generally indicated at R, is carried on y-a shaft 15 mounted eccentrically, relative to the axial center of the shell, the shaft being journaled in bearings 16, 16a, inserted within annular recesses 17 formed in the casing end plates. The body of the rol tor comprises a wheel 19, having a general cylindricalshape, mounted on an enlarged portion 15a of the shaft. The rotor wheel is secured to shaft flange 15b by means of screws 20, and to ring 22 keyed to the opposite shaftnear the end of the enlarged portion plates in order to minimize the tendencyfor v,

leakage to occur around'the rotor during comresslon of the'fluid in the peripheral space tween the rotor and the casing, las descrlbed at a later point. Leakage around the rotor will occur to the point 'of filling annular I spaces 23 between the rotor and the casing end plates, further leakage from spaces 23 around the rotor shaft and through the casing being prevented b suitable means, for

5 exam lelpacking glan s 18. It may be men- 1 be understood that numerous other forms of lrotor construction and mounting may be employedwithout departure from the essence of my invention.

A plurality of radial slots 24 are formed in the rotor at equal angular intervals, the-slots extending radially inward through the rotor flanges. Within each of the slots 24 is carried a radially movable blade or impeller 25, the blades being substantially the same width as the rotor wheel at its. outerperiphe The blades preferably have a snu slidinglgt within the radial slots. Each o the blades 25 has an integral shank 25a inserted within a radial bore 26 drilled in the rotor wheel at the base of the slot, there being suilicient clearance at 27 between the shank and the bore wall to ermit the insertion of a coil sprin 28, which serves to thrust the blade radia ly outward against the inner peripheral wall of the casing.

A'pair of parallel grooves 30 are lformed longitudinally in the outer ends of blades 25, each of the end grooves continuing respectively in rooves 31 and 32 formed in the opposite si es of the blade. Within each end groove and its corresponding side groove is an angle-shaped seal leaf 33, between the inner side of which and the base of the groove is laced marcel springs 34. By thus provi in for each blade, two separate leaves .exten ing on opposite sides thereof, and each capable of indivldual lateral movement relative to the blade, by the action of the marcel sprin s, an effective seal is rovided between t e ges of the blades an the casing wall.

The rotor wheel is eccentrically positioned within the casing, and has a predetermined amount of clearance at 36 from the casing wall. The degree of eccentricity of the rotor within the casing is such that the rotor substantially engages the inner wall of the casing at a point 35, which point is predetermined in accordance with the position of the inlet and the angular spacing between blades. Fluid is taken into space 36'between the rotor and casing from inlet 37, ythe mouth of the inlet within the casing being shown in the present instance to terminate at a oint 37a in vertical alinement with the rotor s aft. In order that the maximum volume of fluid may be taken into the peripheral space bethe casing wall will lie on a diameter'bisecting the angular distance between two successive blades, after the last, in the direction of rotation of the rotor as lndicated by arrow A, see Fig. 1) just moves past the inlet at point 37a. Thus in the illustrated form of um wherein I show therotor to carry eig t b ades, point will be ylocated at approximately 221/ clockwise of the vertical center line L of t e casing, on a diameter bisecting the angular distance between blades B and C in the positions shown, the mid int of space 36av between blades B and C ing the point of greatest clearance between the rotor andvcasing. It will be understood, of course, that the rotor ma carry any desired number of blades and t at the position of thev rotor -within the casin relative to the Vinlet may be varied accor ingly. For example, assuming there to be four symmetrically arranged blades on the rotor, the point of engagement or of closest proximity of the rotor to the casing would be located at a point substantially 45 clockwise of the vertical center line L.

Although any suitable arrangement of exhaust ports may be provided in the casing whereby` the fluid may be dischargedkfrom space 36 during compression, I prefer to arrange the ports in a manner such that the fluid may be dischar ed laterall throu h the side, and prefera ly both si es of t e rotor, instead ofy discharging the uid -directly from space 36 at a. point beyondl the periphery of the rotor. A plurality of recesses 40 are formed in the rotor wheel between successive blades, there also being formed ports 41 leading from the recesses through opposite sides o the rotor. During compression of the fluid within space 36 as it is carried in advance of the blades, fluid `is discharged through lateral ports 41 into circularly extending exhaust conduits 43, which may conveniently be cast integrally with the casing end plates, by way of arcuate ports 45 in the end plates, these ports being coextensive with conduits 43 for a predetermined distance determined by the interval during which compression occurs. The center of curvature ofconduits 43 and ports 45 is', of course, at the centerof the rotor shaft.

In the operation of the pump, .fluid is taken from inlet 37 into space 36 between successive blades and yis compressed from a maximum volume 36a and progressively discharged from the clearance space into exhaust conduits 43 by way of ports 45 during he travel of the blades from the point of intake to point 35, at which point orts 41 are closed to the exhaust passages y their movement beyond lthe end of the arcuate ports 45. Initial discharge occurs at that point at which ports 41 are brought into registration with the lower end of ports 45, this vinitial discharge occurring just after a full volume of Huid has been drawn in and sealed between successive blades after the last has moved past point 37 or the edge of the inlet. The start of intake may occur at any suitable point after the blades have the inlet port being shown, to occur at a point 48.*substantially the distance between lades from point 37a.

A s previously mentioned, the invention in, its broader aspects contemplates the-arra'n ement of the .discharge ports at any suita le location in the casing shell or end plates. E or glrposes of illustrating one variationalV emdiment ofthe invention, I have shown in Fig. 7 a pump generally similar to the described form except that ythe rotor wheel 191 has between blades a smooth peripheral surface, and the discharge orts are located so as to enable the fluid to expelled directly from the sides of the compression space instead of by way ofvpassages in the rotor. According to' the construction shown in Fig. 7, fluid in the compression space 36 is discharged through ports 60 formed in the compression space entirely at the outside of the rotor. -The angular or circular extent of' each' setof ports 60 will, of course, be substantially the same as that ofl ports 45,.

,It will be understood`the drawings and description are to be considered' merely as illustrative` 'f Iand not restrictive on the 'A broader claims appended hereto, for various changes in design, structure and arrangement may be made without departing from the spirit and scope of said claims.

I caim- Y s Y 1. n a rota pum a casing comprising a cylindrical sllill havling end closures, a cylindrical rotor mounted eccentrically within Athe casing'so as to substantially engage said shell at one point, there being a compression space between the rotor and said casing shell, a plurality of radially movable 'blades mounted on the rotor, a fluidv inlet openlng `into said compression space, concave recesses formed in the cylindrical surface of said rotor between adjacent blades, said besubstantially-coextensive in'length with the angular distancebetween adjacent blades ing through the periphery of the and 4open 1 -rotor throughout their res ive lengths, a 4diachar port in one.v of said endclosures between tlee point of-maximu clearance between the rotor and. casing an the int of e ent of therotor with the casing, and a plurality of lateral ports 'extending from sald'eoncave recesses in the rotor through one end ofthe saiddi'schargeport. s

2. In a rotary pump,` a casing comprising a c u l moved past point 35, initial uncovering of casing end plates in a manner similar to- 'opening have hereunto `subscribed rotor and adapted to register with cylindrical shell havin end closures, acylmdrical rotor mounteffeccentrically within the casing so as to substantially engage said shell at one point', there being a` compression space between the rotor and said casing shell, a pluralityof radially movable blades mounted on the rotor, a fluid inlet opening directly into 'said compression space throughsaid cylindrical shell, concave `recesses formed in the cylindrical surface of said rotor between adjacent blades, said recesses being substantially coextensive in length with the angular distance between adjacent blades ,adaptedI to register with said discharge port.

3.- In a rotary pum a casing comprislng a cylindrical shell haviiig Iend closures, a cy- Iiiidrical rotor mounted eccentrically within the casing so as to substantially engage said lshell at one point,` there being a compression space between the rotor and said casing shell, aplurality of radially movableblades mounted on the rotor, yielding means urging Y said blades radially outward, a lluid inlet/ directly into said com ression space throug said cylindrical Shel concave recesses formed in the' -cylindrical surface of said rotor between adjacent blades, said recesses being substantially coextensive in length with the angular distance between adjacent blades and opening through the Vperiphery of the rotor throughout their respective lengths, discharge ports in both of the casing end closures betweeny the point of 'maximum clearance between the rotor and casing and the point of enga ment ofthe' rotor with the casing, and a p urality of lateral ports extendi from saidconcave recesses in the rotor ltroug'hboth ends of the rotor and adapted to register Vwith said discharge-port. c

In witness that I claim the foregoing I y my name' this 12th day of December 1929. v DIMITBI. N. HAPKINS.

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