US2484993A - Rotary pump - Google Patents

Description

Oct. 18, 1949.. M. GRUBER 2,484,993 v ROTARY PUMP Filed June 4, 1946 Patented Oct. 18, 1949 I UNITED STATES PATENT OFFICE BOTABY PUMP Milan Gruber, Aliquinnfl, Pa.

Application June 4, 1948, Serial No. 674.295

1 Olaim. (Cl. 103-136) This invention relates to rotary pumps in which an eccentrically mounted rotary drum carrying a. plurality of oylindrical roller pistons operates within a stationary pump housing.

One of the main objects of the present invention is to provide a rotary pump inwhich the cylindrical roller pistons are not depending on centrifugal force in order to create suction within the pump housing, such as is the case with nearly all pumps-of that type.

Another object of the invention is to provide a rotary pump in which the cyllndrica1 roller pistons always uniformly contactl the inner peripheral bore of the pump housing, while the eccentrically mounted drum in which said roller pistons operate rotates.

Still another object of the invention is to proi vide a rotary pump with an eccentrically mounted drum in which a plurality of cylindrical roller pistons freely rotate and which are in uniform vcontinuous contact with the inner peripheral surface of the pump housing by means of a freely inserted cylindrical Spring-member.

Yet another object of the invention is to provide a rotary pump which may be reversed without resorting to any alterations.

Another object of the invention is to provide a rotary pump which may be operated at slow speed and which will pump liquid almost immediately after the piston retaining drum is being rotated.

I Further objects of the invention are to provide a rotary pump of the class set forth that shall be of exeeedingly simple construction and arrangements, efiicient in its Operation and which can be inexpensively manufactured. i

To the accomplishment of these and such other objects as may hereafter appear, the invention consists of the novel construction, combination and arrangement of parts herein specifically described and illustrated in the accompanying clrawing, wherein is shown an embodiment of the present invention, but it is to be understood that changes, variations and modifications may be resorted to which come Within the scope of the claims hereunto appended.

In the drawing wherein like numerals of reference designate corresponding parts throughout the several views:

Figure 1 represents a front view of a rotary pump constructed in accordance with the invention in which one half is shown in outline and the other half is shown in cross-section on line I-I in Figure 2.

Figure 2 is a side view of Figure 1 taken online 2-2 in Figure 1.

Figure 3 is an isometric view of the rotary drum constructed in accordance with the invention.

Figure 4 is an isometric view of the cylindrical double Spring member as used in the invention.

Figure 5 is an isometric view of one of the cylindrical roller pistons.

Figure 6 represents an outline front view of the device, the front bracket being removed and the supporting legs broken away.

Figure 7 is a fragmentary side view of the rotary drum showing the cylindrical roller pistons in position and mounted within the drum and extending outwardly of the drum and contacting the inner peripheral bore of the piston housing.

Referring now more particularly to Figure 2 of the drawing, the rotary pump comprises in general a piston housing ili, a rotary piston drum II, the front bracket IZ. the rear bracket I3, the cylindrical roller pistons H and the cylindrical spring sleeve 33.

The said piston housing IU may take any form consistent with the use to which the mechanism is to be put and includes a cylindrical bore l6, an inlet port IT and an outlet port I 8. The inner ends of these ports are preferably enlarged as shown in dotted lines in Figure 1 and indicated by the numerals l9 and 20. These enlargements extend an appreciable distance of the bore Hi, with the exception that 20 extends upwardly and 19 extends downwardly. This feature permits the pump to be reversed at will without any alterations.

The rotary piston drum II, as best shown detailed in Figure 3, comprises a circular dise 2! provided with integral, upstanding guide blocks 22, radially arranged to provide a guideway 23 for the roller piston Ill.

A drive shaft 24, preferably integral with the outside face 25 of said dsc 2l, extends centrally and outwardly and is provided with a ball bearing 26 in abutment with said outside face 25.

Another circular disc 21 is secured to the free ends 28 of said guide blocks 22 by means of screws 29. or the said disc 21 may be made integral with the drive-shaft 24, disc 2I and guide blocks 22 if found convenient to do so.

The outer face 30 of said disc 21 is provided with a centrally disposed and outwardly extending, integral stub-shaft 3I which is adapted to receive a ball bearing 32. i

The rotary piston drum I I, as shown in Figures 1, 3, 6 and 7 is designed to receive four of said rollers I 4, of course, more or less roller pistons may be used if so deslred.

The cylindrical roller pistons I 4, as shown detailed in Figure 5, are of such diameter that all four rollers will contact the interior cylindrical bore I6 of the piston housing at the same time. This is accomplished, in order to provide a constant positive tendency to thrust the roller pistons I4 outwardly and in contact with the bore I6 of the housing III, by means of a cylindrical spring member 33, such as shown detailed in Figure 4.

This spring member 33 is positioned centrally within said drum I I and in positive contact with the four rollers I 4 freely conflned in the guideways 23 between the upstandlng guide blocks 22 of the drum II as shown in Figures l, 6 and 7.

The aforesaid cylindrical spring member 33 comprises an inner cylindricai spring 34 which is snugly surrounded by an outer cylindrical Spring 35.

This inner cylindrical spring 34 may be made from any appropriate springsheet material and formed to provide a longitudinal gap 36, while the outer cylindrical Spring 35 snugly surrounds the inner Spring 34 and is provided with a biased gap 31 (Figure 4) of substantially heiical configuration.

Assembled, the discs 2I and 21 of said rotary piston drum II as well as the guide blocks 22 are finished to form a srnooth cylindrical surface 38.

The front bracket I2 comprlses an annular cover for the piston housing III having a reduced, annular outer portion 39. The inner face 40 of said front bracket I2 is provided with an eccentric counterbore 4I deep enough to accommodate the disc portion 2I of the drum I I, so that when the latter is in assembied position, the inner'face 40 of the front bracket 62 comes in perfect alignment with the inner face 42 of the drum I I.

The aforesaid reduced outer annular portion 39 is provided with a common stufling box 43 which is relied upon to seal the pump of any liquid escaping from the interior of the pump.

The rear bracket or cover `I3 comprises a circular cover for the piston housing Ill having a reduced portion 44. The inner face 45 of said rear bracket I3 is providedl with an eccentric counterbore 46 to accommodate the disc 2'I of the drum II, when assembled. v

Of course it is well to note that the eccentric counterbore 4I of the front bracket or cover I2 and the eccentric counterbore 46 of the rear bracket I 3 are in allgnment, when assembied, and in eccentric relation with the bore I6 of the piston housing IO.

The front and rear brackets I2 and I3 respectively are also provided with a counterbore 4'Iv and 48 in which the ball bearlngs 26 and 32 respectively are mounted.

In order to secure the pump to a suitable base, legs 49 are provided. These legs may be integral with the brackets I2 and I3, as shown, or they may be integral with the piston housing III, or otherwise.

Obviously lubricant may be introduced to the ball bearings 26 and 32 through openings 50 and 5I respectively and to the outer faces 25 and 30 of the discs 2I and 21 respectively of the rotary drum I I and therefore to the eccentric counterbores 4I and 46 in which the discs as part of the drum II rotates.

Located in each roller guide-way 23 of the drum II is a cylindrical roller piston I4 which fitS snugly therein, and also between the inner faces 40 and 45 of front bracket I2 and rear bracket I3, respectively.

The Operation of my rotary pump is as follows:

Assuming that the inlet port I1 is connected by suitable piping to a liquid supply and the outlet or discharge port I8 connected to a distributing system which may be a pipe leading to a reservoir or other suitable means.

When the pump is operated in either direction by manually rotating the piston drum-shaft 24 or by motive power if so desired, the drum I I, of course, also rotates and with it the roller pistons I 4, and since the piston drum II and the piston housing III are mounted in eccentric relation, a crescent shaped space 52 is thus created therebetween.

While the piston drum II rotates, the roller pistons I4 roll in and outwardly of the guide-way 23 between the guide-blocks 22 .of the drum II and on account of the cooperative arrangement of the roller pistons I4 and the cylindrical spring member 33, the roller pistons I4 are always in positive contact with the peripheral surface of the bore I6 .of the piston housing Ill.

At this time, I desire to call special attention to the fact that the herewith described roller pump is not of the type in which the roller pistons depend on centrifugal force to contact the inner surface of the cylindrical bore in the housing so they may form a sealed space during its contact.

As previously described the roller pistons in my invention are continuously in contact with the bore I6 of the piston housing II) thereby forming a sealed space between the roller pistons I4 and the bore I6 of housing II'I, and owing to the ecfl centric mounting of the piston drum II in which the roller pistons operate in the piston housing Ifl, the sealed space between the roller pistons and the bore I6 is increased in volume as the drum I I is rotated thus producing a suction which lifts the liquid and causes it to ow into the port I'I or IB, depending in which direction the pump is being rotated, where it enters and fllls the space between the roller pistons I4 and the housing bore I6.

As the piston drum II rotates, the other roller piston comes into operative position relative to the intake port and as it passes the point 53 of the crescent shaped space 52 between the periphery of the bore I6 in housing III and the drum II attenuation will be provided to suck or draw fiuid in.

As the crescent space decreases towards the outlet, the effect of the roller pistons will be to build up pressure in the fluid and force the same through the outlet port under increased pressure.

The maximum pressure under which the pump operates can be varied by varying the speed of rotation of the piston drum.

In the above specification the pump has been described with relation to the rotary drum having four roller pistons Operating therein, but it is evident that any number of rollers can be used.

While a preferred specific embodiment of the invention is hereinbefore set forth it is to be clearly understood that I am not limited to the exact construction illustrated and described, be-

cause various modifications of the details may be provided in putting the invention into practice within the purview of the appended claim.

I claim:

A rotary pump comprising a housing provided 5 with a cylindrical bore; intak'e and discharge ports leading to said bore, covers for said housing, a piston drum supported for rotation in said covers in eccentric relation to the .bore of said housing, said drum being provided with a pluralityl of radial guide Ways, each of said guide. Ways adapted to accommodate rotatably and slidablya horizontally disposed cylindrical roller v piston, and centrally disposed means for urging said roller pistons uniformly against the wallof 15 Number the bore of said housing,- said means comprising two hollow coaxial resilient cylindrical members of which the inner one is telescoped into the outer member, each having one gap extending throughout their length, the said gap of said outer member being helical.l

' v MILAN GRUBER.

REFERENCES CITED The following'references are of record in th file of this patent:

UNI'I'E STATES PATEN'IS France Nov. 12, 1924

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