US2589449A - Movable vane pump - Google Patents

Description

March 18, 1952 s. o. STAGEBERG MOVABLE VANE PUMP 5 Sheets-Sheet 1 Filed 001;. 15, 1943 Inventor March 18, 1952 s. o. STAGEBERG MOVABLE VANE PUMP 3 Sheets-Sheet 2 Filed 001;. 15, 1945 fig. 7

Inventor 0- Sta .3

geber a Stt'lir w Mt? Atbornegs I March 18, 19 52 s, Q STAGEBERG 2,589,449

MOVABLE VANE PUMP Filed Oct. 15, 1945 s 'Sfi'ets-Shot 3 Invenbor Sterling O. Stageberg A ornggs Patented Mar. 18, 1952 UNITED STATES PATENT OFFICE MOVABLE VANE PUMP Sterling 0. Stagcberg, Minneapolis, Minn. Application October 15, 1943, Serial No. 506,325

2 Claims. 1

My invention relates to pumps, and particularly to variable capacity pumps, and has for an object to provide a positive and practical construction in which the volume of the pump may be easily and accurately controlled during operation of the pump.

Another object of the invention resides in providing a pump in which the volume of the pump may be controlled by the movement of a single lever from one position to another.

Another object of the invention resides in constructing the pump with a rotor having longitudinally extending slots therein and in further providing an annulus encircling the rotor and rollers mounted in said slots and cooperating with the annulus.

A feature of the invention resides in providing adjusting means for varying the eccentricity between'the annulus and the rotor to vary the output of the pump.

. A still further object of the invention resides in providing supporting rings associated with the rotor and engaging the rollers and holding the same in position adjacent the annulus.

Another object of the invention resides in supporting the annulus for rotation within a mounting arranged for transverse movement relative to the axis of the rotor.

A feature of the invention resides in providing antifriction guiding members for said annulus and in the manner of supporting the anti-friction members for movement.

Another object of the invention resides in providing means for conducting a fluid under pressure in back of the rollers to force the rollers into engagement with the annulus.

'A feature of the invention resides in the specific construction of the rotor and associated parts.

Another object of the invention resides in providing a construction for overcoming leakage produced by flexure of the rotor shaft.

Another object of the invention resides in the construction for conducting fluid to and from the expansible chambers of the invention.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

In the drawings:

Fig. l is a longitudinal elevational sectional view of a pump illustrating an embodiment of my invention.

Fig. :2 is a perspective view of the rotor of my invention.

Fig. 4 is a view similar to Fig. 3 taken on line' 4-4 of Fig. 1.

Fig. 5 is a view similar to Fig. 4 taken on lin 55 of Fig. 1.

While my invention is primarily intended as a pump for pumping liquids, such as oil and similar liquids, the device can also be used as a fluid motor and for any other purpose where a device having movable elements arranged to provide valved expansible chambers is desired. It is hence to be understoodthat this application for patent, while specifically describing a pump, also embraces such other devices and uses.

My invention comprises a case indicated in its entirety by the reference numeral ID. This case is constructed with an intermediate section II and two end sections I2 and I3. These various sections are secured to one another by means of cap screws I4 which pass through the sections II and I3 and are threaded into the section I2. The case In is flat on the bottom, as designated at I5 in Figs. 3, 4 and 5 and the various sections thereof are secured to a base I6 by means of screws I! which extend through the base I6 and are threaded into the intermediate section II. Slots I8 at the edges of the base I6 serve to receive bolts or other fastening means, whereby the pump may be secured to a suitable support, not shown.

The two end sections I2 and I3 of the case II] have bores 2| and 22 extending through the same, which bores are recessed at 23 and 24 at their outer ends to receive ball bearings 25 and 26. A shaft 21 extends through the bores 2| and 22 and is journaled in the ball bearings 25 and 2B in a manner to be more fully described. A cap 28 encloses the ball bearing 26 and the outboard end of the shaft 2'! and is secured to the end section I3 of case In by means of the cap screws I4, previously referred to. An oil seal 33 is mounted in the cap 28 and engages the shaft 21 to form an oil-tight connection between the said shaft and case ID. The recess 23, in the end section I2 of case II), is covered by means of a cover plate 29 which is secured to said end section by means of screws 3| which pass through said cover plate and are threaded into the end section.

The shaft 21 carries a rotor indicated in its entirety by the reference numeral 34. This rotor may be constructed from solid material which is cut out to provide a number of longitudinally extending bars 35 which are attached to and supported intermediate their ends by means of a web 36. The said bars are spaced from each other and have parallel facing surfaces 3? and 38 which form radially and longitudinally extending slots 39 therebetween. This construction also provides annular recesses 41 in the ends of the rotor which are defined by the shaft 21, the inner surfaces of the bars 35 and the web 36. The outer surfaces 42 of the bars 35 are cylindrical and concentric with the axis of the shaft 27, while the end surfaces 43 of said bars are coplanar and at right angles to the axis of the shaft 2! and form the end surfaces of the rotor 34.

Adjacent the rotor 34 on each end thereof are mounted bushings or end members 44 and 45 which are constructed at their inner end-s with flanges 45 and 41 whichengage' the end surfaces 43 of the rotor 34. These bushings are urged into engagement with the rotor by means of nuts 48 amt-49 which are screwed upon threaded portions 5| andpZ -{of the shaft 2?. These bushings have recesses-53 formed therein which receive the ball bearings 25;;and 26 and which support the said shaft for rotational movement within the case l3. Washers54 on the shaft 21 adjacent the ends of the bushings 44 and 45 engage the innermost races of the said ball bearings and securely clampthe same in position; so that end play of the rotor is prevented.

The inter-mediate section it of case it is formed with a compartment 57 within the same substantially cylindrical in form. In this compartment is mounted a stator indicated in its entirety by the reference numeral 50. This stator includes a mounting 58 which is annular in form and which is of smaller dimensions than those of the compartment 51, whereby said mounting may bemoved toward and from the axis of the shaft 21. The mounting 58 has a bore 59 in which is received a race 6|; Within this race is disposed an annulus 62 which is guided for rotational movement within the race 57 by means of The annulus 62 is constructed with a bore 3? which is considerablylarger than the diameter of the rotor 34 and which receives said rotor. This bore is, during the operation "of the pump, eccentrically disposed relative to the shaft 27 and the eccentricity thereof may be varied by moving'the mounting 58 in a radial direction. within the compartment 57 of case it. Mounted in the slots 39 of the rotor 34 are a number of rollers 68 which fit snugly against the surfaces r 3"! and 38 of the bars 35 to afford a fluid-tight connectiontherebetween. These rollers also are arranged to engage the bore 61 of the annulus 62.

.By "means of this construction, a number of chambers H, 12, l3, l4 and are'formed betweenthe various rollers, the rotor 34, and the annulus 62. As the rotor rotates, the rollers move radially towards and from the axis of the shaft 2"! in engagement with the surface 67' of the annulus 52 to successively increase and decrease the volumeof said chamber, whereby a' pumping action is procured. 1

- ing 44.

are two rings 75. These rings engage the rollers E38, while in their slots and hold said rollers substantially in engagement with the bore 61 of annulus 62. Endwise movement of these rings is limited'by means of the web 36 of rotor 34 and the flanges 46 and 4'! of the end members 44 and 45. To cause the rings 16 to clear the shaft 21 when the mounting 58 is at the extreme end of its pathv of movement, the said shaft is undercut, as indicated at I02 and N33.

The length of the intermediate section, of case It) and of the rotor 34 are equal. The end members I2 and [3 are rigidly clamped to the intermediate section II to prevent relative movement therebetween and the end members 44 and 45 are clamped against the ends of the rotor 34 to similarly prevent relative movement therebetween. The stator 50, consisting of the mounting 58, the race Bi, the annulus 62, as well as the rollers 68, are all of the same length and slightly less in length than that of said section H and the rotor 34, so that these parts may move freely between the flanges'46 and "41 and the adjoining surfaces of the end sections 12 and I3 and yet form substantially fluid -tight connections there facing port 19 which is adapted to alternately communicate respectively with two manifolds '81 and 82 formed in the end member l2, (Hg. 4). The manifolds BI and 82 communicate respectively. with passageways 83 and 84 in the base 16 which passageways communicate with tubular fittings 85 and to which suitable tubes or pipes, leading to and from the pump, may be connected.

. When the rotor 34 operates in a clockwise direction, and the eccentricity is as shown in Figs. 3 and 5, a fluid contained within the chambers l3, l4 and 75 is forced out of said chambers and into the manifold 81. As rotation occurs, the chambers II and 12 increase in capacity and the fluid is drawn into these chambers through the-manifold 82. Manifold 82 hence serves as an inlet for the pump and the manifold 8'! as an outlet for the pump.

For the purpose of maintaining the rollers 63 in fluid-tight contact with the bore 57 of annulus 62, the following construction is employed.

, Within the interior of the end section l3 of case 91 which snugly engage the outer surface 93 of.

the bushing 45 to form 'afluid-tight connect-ion therebetween. The facing ends of these sleeves are normally spaced and said sleeves are urged Mounted within the recesses l l of the rotor 3415 into contact with the shoulders 94 and 89 by means of a crinkled spring 99 which extends bei tween said sleeves throughout the circumferential extent thereof. The undercut 143 in the shaft e 2'! extends within the bushing '45 to form an annular passageway 104 which communicates with the recess 4|. The annular groove communi- This hole terminates in an outwardly through the bushing 45. In the end section I3, as shown in Fig. 5, two passageways I05 and I06 are provided, which are connected to the passages ways, 84 and 83, respectively. Check valves I08 are provided in each of the passageways I05 and I06, so that the liquid under pressure may enter the groove 95 through either passageway. When the shaft 21 is turned in one direction and with the eccentricit in a certain direction, the passageway 84 contains fluid under pressure which opens the valve I08 inpassageway I05 and discharges through the groove 95, the passageways I01 and I04 and into the recesses 4I. Pressure in these recessesforces the rollers 68 outwardly and against the bore 61 of the annulus 62. In such case, there would be a suction in the passageway 83 and the check valve I08 in the passageway I06 would prevent flow of fluid into the passageway 83. When the shaft 21 rotates in the opposite direction or the eccentricity is reversed, fluid under pressure is conducted through the passageway I06 and into the recesses M and the check valve I08 in the passageway I05 would block the flow of fluid through this passageway.

For the purpose of guiding the mounting 58 formovement in an axial direction to vary the output of the pump, a construction best shown in Fig. 3 is employed. The mounting 58 is constructed with two oppositely facing parallel surfaces III and H2. Adjacent these surfaces, the intermediate case member II is constructed with two surfaces H3, II 4 spaced from the surfaces III and H2 and parallel therewith. Between these surfaces are mounted rollers II'5 which are held in cages H6 and II! which permit rolling movement of the rollers with respect to the surface which they contact, but which hold the rollers in proper position. Both the cages II 6 and II! are supported in the same manner and only the construction for supporting the cage I I6 will be described. This cage has at its upper end an opening I I8 in the same through which a lever II9 extends. The said lever extends into a notch I2I in the section II of case I and into a corresponding notch I22 in the mounting 58. The said notches and the opening II 3 are of such construction that the cage I I6 will move vertically, traveling one-half the distance of the mounting 58. In this manner, the rollers II which engage both the surfaces [I3 and III are guided for movement and slippage is prevented. It will readily be comprehended that the mounting 58, by means of the rollers H5 is guided for up and down movement, so that the aXis of the annulus 62 may be moved toward and from the axis of the cured thereto by means of screws I28. The handle I21 operates through a slot I29 in the housing I23.

The advantages of the invention are manifest. The pump may be constructed extremely rigid, so that high pressures maybe procured. My improved pump is balanced so that pulsations are eliminated, thereby permitting the pump to be operated at high speeds.

Due to the mounting of the annulus in a roller bearing, pressure on the displacement rollers procures a fluid-tight connection between these rollers and the annulus, without causing the rollers to wear flat. By means of the supporting rings for the rollers, the rollers are at all times maintained in proper position for immediate action. The pump therefore picks up pressure immediately without having to rely solely on centrifugal force to bring the rollers into action. By means of the spaced sleeves used in conjunction with the rotor .or'i the outboard end of the rotor shaft, a. fluid-tight connection is procured which will operate even though the shaft be slightly sprung, asfrequently occurs when a pump is heavily loaded. My improved pump can be adjusted in capacity while the same is operating and the simple movement of a single lever causes change from zero volume to maximum capacity. My improved pump is compact and sturdy and is extremely efficient for its type.

Changes in the specific form of my invention, as herein described, may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by' Letters Patent is:

1. In combination, a rotor, a shaft therefor, said rotor having a surface concentric with the axis of the shaft, and being formed with spaced annular recesses, said rotor having longitudinally extending bars spaced from one another to form slots therebetween extending through said surface and into said recesses and bringing said recesses into communication, an annulus encircling said rotor and having a bore eccentric with reference to the axis of said rotor shaft, rollers disposed in said slots and engaging the bore of said annulus, bushings mounted on said shaft and having flanges disposed adjacent the ends of said rotor, said annulus being disposed between said flanges, said bars having grooves extending longitudinally thereof, one of the flanges having passageways therein communicating with said grooves and means forming inlet and outlet chambers adapted to successively communicate with said passageways.

2. In combination, a stator having a bore therein, a rotor within said bore having an axis eccentric with respect to the axis of said bore and having a plurality of slots therein, members in said slots forming in conjunction with said rotor and stator a plurality of expansible chambers, means forming in conjunction with said stator a bare and an annular groove extending outwardly from said bore and having two radially facing surfaces, a revoluble member on said rotor disposed within said bore, spaced sleeves on said revoluble member slidable along the same and having portions extending into said groove and provided with surfaces thereon engaging the surfaces of the stator at said groove, resilient means acting between said sleeves to urge the surfaces thereof into engagement with the surfaces of said stator, said revoluble member having passageways therein leading from behind the members in said slots to the space between said sleeves, and means for conducting fluid under pressure into the space between the sleeves.

STERLING o. STAGEBERG.

(References on following page) 7 REFERENCES CITED jlhe follbwing references are of record in the file of 'ghis patent: V V

V UNITED STATES PA'I'ENTS Number V rmassa 1,466,904 7 Name Date Wilson Nov. 25, 11913 Jackson Sept. 4, 11923 'coiebrook Sept. 11, 1923 Ro'lalfl" Apr. 26, 1927 Barlow Mar, 4, 1930' Rayburn Jan.1 6,-1934 "Ott, July 3, 1934 Number 2,001,325 2,036,711 2,159,941

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