US2444234A - Rotary cylinder pump - Google Patents

Description

June 29, 1948. s, Q STAGEBERG 2,444,234

ROTARY CYLINDER PUMP Filed June 28, 1943 V 2 Sheets-Sheet 1 Inventor Sterling O. stageberg e9. M o w 18 68 5/ 1 Attor ne s June 29,1948. s. O..$TAGEBERG 2,444,234

ROTARY CYLINDER PUMP Filed June 28, 1945 4 Sheets-Sheet 2 Iii-2' 4 Inventor Sterling O. Stageb g wlfigw Attornegs attached at their-extremities to said Patented June 29, 1948 umrso STATES PATENT OFFICE ROTARY. CYLINDER mm sterling 0. Stageberg, Minneapolis; Minn Application June as, 1943, serial sq. 492.505

Claims. (Cl. roe-121) An object of the invention resides inproyiding a pump having two relatively movable displacement members with facing surfaces, port-ions of said surfaces beingladapted to approach and remade from .one anotheriupon relative movement .of said members and inrproviding vanes rigidly membersat said surfaces.

Another object of the inventionresides in con- .structingthe vanes from resilient material.

An object of the invention resides in arranging the yanesin the form of aloop.

A feature .of the invention resides in utilizing .a {clamp member for securing the extremities .of the cranes to the displacement members.

, Another object of the invention resides in constructing the clamp members with hacking surfaces attached .to engage the vanes and .to limit the flexu-re of the .vanes adjacent the localities of ttachment of the vanes to the displacement members.

A still {further object of the invention. resides in constructing the .pump with aninlet and an .outlet and with .ports communicating therewith and shaped to conform to the shape of the .expansible chambers between the vanes.

Another object .of the invention resides in providing .a pump having two liotatabledisplacement members, each rotating in balanced relation about its \own axis, the axis .of said displacement members being non-coincidental.

Another object of the invention resides in ,pro-

viding driving meanstor driving .one of said .dis-

placement members to cause lqperation of .the other displacement member through the :vanes connected to the displacement members and in further providing transmission means for .preventing reverse relative movement between said displacement members to ,preventbucklin of the vanes. I

.A ,ieature of the invention resides in utilizing as said transmission a torsional coil spring con: nected to said displacement member and twisted to maintain -certain of said vanes .in tension.

Other objects of th invention reside inthe Fig, 2 is an ielevational sectional view taken on line 2-1-1 of Fig. 1 and drawn to .a somewhat larger scale. 1 1 Y Fig. ,3 is an enlarged sectional view taken on line ,3-.-\3 of Fig. 2and drawn to the same scale as While .I have described my invention as ,Ja pump, it is to be understood that the invention may heembodied in any type of device hav'ingexpansible chambers, such as a ,pump, compressor, motor or similar structure and that the word pump, when used in the specification, should he so interpreted My invention comprises a case in constructed with .twos'ections .I] and 12. The sectionjll has a'ci-nciunierential Wall .I'Band a radial well ill connected therewith. Issuing from the radial wall 14 and concentric with the "circumferential wall I3 is .a tubular boss iii. The section .12 xcomprises a radial Waller end plate 16 which overnovel combination and arrangement of parts and in the details of construction hereinafter illustrated and7o'r' described.

"Inthe drawings: Fig. 1 is an elevational View of a p mn w trating an embodiment of my invention.

.lies a flange [1 formed on the circumferential wall I; of section H and which is secured thereto by means of cap screws id. The wall 16 has issuing from it a tubular boss 19 similar to the boss 115.. boss may ,beintegral with the :Dlate tor the same may be detachable therefrom as shown in the drawings. In such case, the wall 4 51s constructed with a bore i2! which receives the end 22 of the boss 19. A number of screws 23 extend'lthrough afiange 24 on the boss 19 and are screwed into the plate }I'B tor holding the said boss attached thereto. 1

Within the interior of the case I'll ,aremounted two displacement members 25 and .25 which are mounted tor nelative movement andccnstructed in the following manner. The displacement member 245 comprises a shat ,217 which extends through the boss 1L5 andls journaled at its outer end in -.a ball bearing 23 mount ed at the outer end of said boss. ,Thisshaf-t has an enlarged portion ZBe'xtending inwardly from the bearing .28 which, in turn, is iournaled in a ball bearing 13] mountedin an offset 32 in theLboss f5. An oil seal .33 retains the liibrication within the hearing 3| and prevents the same from flowing into the operating mechanism of theldevice. The displacement memher 215 .further includes an end mat s: which has anannulus or ring 35 secured thereto by means of screws 36 which extend through the plate .34 and are threaded into the ring 35. The ring .35 is concentric with the axis of the shaft 21. The shaft .2], through the action of the 'ball bearing 28 .and 3]., is guided tor rotational movement about an axis concentric with that of the ring 35. .Axial movement -.of the said shaft maybe eliminatedby means of nuts in the bearings 42 and 43 is taken up by meansof a nut 45 screwed upon the end of shaft 4|. The

shaft 4| terminates at the end of the boss [9 which is closed by means of a cap 46 secured to the extreme end thereof. As will be noted in Fig.

2, the axis of the shaft 4! is eccentric with refsaid ring. The clamp member 64 has a spiraling surface 66 which recedes from the spiraling surface 53 and which forms a backing surface similar to the backing surfaces 51 and 58 of the clamp member 53. These surfaces limit flexing of the vanes at the localities of attachment to the displacement members and thereby increase the life of the vanes,

The eccentricity of the two shafts 21 and 4| is such that the various vanes 41a, 41b, 410, etc., between the ring 35 and the lowermost clamp member 53 just fill such space. The other portions of said vanes loop outwardly from the clamp member 53 and form more or less crescent shaped chambers indicated at 67a, 61b, 610, etc. The

' surfaces 59 of the clamp members 53 conform to erence to the axis of the shaft 21 but parallel thereto.

Betweenthe hub 39 and the ring 35 are mounted a number of flexible vanes 41a, 41b, 41c, etc. Inasmuch as these vanes are identical in con struction, and attached to the two displacement members in identically the same manner. only the vane 41a and its mode of attachment will be describedin detail. The vanes are constructed from flexible material such as rubber impregnated fabric,'leather, flexible metals, or any of the rubber substitutes now well known in the art. Applicant has found that ordinary rubber belting of suitable thickness and rigidity will serve the purpose. The vane 41a is constructed as a ribbon and extends spirally between the hub 39 andthe ring 35. The said vane is looped as designated at 48' and. the two extremities 49 and 55 of-said vane extend in the same rotational direction, namely, counter-clockwise, as viewed in Fig. 3. "The hub 39 is polygonal inform, having a number of flat sides 52a, 52b, 520, etc., one for each of the vanes 41a, 41b, 410, etc. In the instant exemplification 'of the invention, there are eight vanes and, accordinglyjthe hub 39 is constructedwith eight sides 52a, 52b, 520, etc.

The extremity 49 of the vane 41a overlies the sur- I face 52a of hub 39 and is secured thereto by means of a' clamp member 53. This member has a'fiat surface 54j overlying the extremity 49 of vane 41a and is bolted to the hub 39 by means of a bolt 55 shown in Fig. 2. Dowel pins56 which extend through said clamp member and into the hub 39 retain the clamp member in proper position upon the hub. The clamp member 53 is constructed with a slightly convex curved outer'surface 51, a highly convex curved surface 58 at one end thereof merged into'the surface 51 and a concave surface 59 at the other end thereof. The clamp member 53, in addition to holding the end of the vane 41 in position, serves as a backin member and the surfaces 51 and 58 .form backing surfaces for the portion of the vane 41 adjacent the extremity 49, so that when the vane 41a is in the position of the Ivane He, said portions of the vane extend along said surfaces and are restrained from further flexure thereby.

The pposite extremity 5! of the vane 41a is attached to the ring 35. For thispurposa'the said ringis constructed with a number of recesses Bic, 6lb,6lc, etc., which have radial ends '62 and spiraling surfaces 63 connected therewith' The extremity 5 l of the vane 41a lies in the recess 6 la and is attached to the ring at such locality by means of a clamp member 64 A number of screws 65 extend through the ring 35 and are threaded into said clamp member, thus securely attaching the extremity 5| of the vanefla to the the formof the loops 48 of the adjacent vanes 41a, 411), etc., when in their most extended positions and help reduce the volume of the chambers 51a, 511 etc., to a minimum when the vanes are collapsed.

Communicating with the various chambers 61a, 67b;'5lc,'etc., is an inlet 68 and an outlet 69. Crescent shaped ports H and 12in the end plate l5 directly communicate with these chambers and also with said inlet and outlet.

In the shaft 21 and'in the'enlarged portion 29 thereof is formed a conical bore I3 shown in Fig. 2. A torsional coil spring 14 is disposed within this bore and within another bore I5 in the facing portion of the hub 39. This spring has secured to the ends of it-bushings 16 which are screwed into the shaft 2? and the hub 39 at the ends of the bores 13 and 15, respectively. Prior to the assembly of the vanes 41a, 41b, 410, etc., the spring 14 is tensioned by rotating the two displacement members 25 and 26 relative to one another and twistin said spring. The said members are then so hold during assembly. After assembly, said members are released and the spring 14 acts to tension the vanes and prevent buckling thereof during operation of the pump.

The operation of the invention is as follows: The hub 39 of displacement member 26 and the vanes 41a; 41b, 47c, etc., fit snugly between the facing surfaces 18 and 19 of the two plates or Walls '34 and I6; A slight amount of clearance is provided, so that friction is minimized and the necessity for lubricationat these localities is eliminated. 1 In Fig. 3, it will be noted that the chambers 61a, 61b, 610, etc., while at the uppermost portion of the device, have a'greater capacity than at the lowermost portion of the device and that the capacity. increases from the bottom to the top and decreases from the top to the bottom, The port 12 communicates with said chambers while the same decrease in volume and receives the contents of saidchambers. The port H communicates with said chambers while the same are increasing in volume and directs the fluid to be pumped into the same. In this manner, the rotation of the two displacement members-25 and 26 causes pumping action, drawing the fluid into inlet 68 and discharging it from outlet 69. In the operation of the pump, the displacement member 26 is driven by the displacement member 25'through the various vanes 41a, 41b, 410, etc. It will be 'noted'tha't the driving is effected through the vanes when they occupy positions similar to that of the vane 41d in the drawings. When the pump is in operation, the pressure within the various chambers and. the tension on the vanes exerted tl'n'ough the driving of the memberjfi by the member 25 causes ,the vanes to assume positions similar to those shown in Fig. 3.

cheese;

inu-nngoperauon of the u p; the vanes follow along the su aces 58 and i or t a p m mbers tvlyalong the ,surface fifi of clamp members 64 and along the surfaces 6'3 of the ring 35 which prevent undue flexing of the vanes at their-localities of attachment and givelong "life'to the vanes. The spring 'Hl restraint reverse relative move,- ment of the displacement membersrelative to one another and prevents buckling of the'van'esl "Theadvantages of the invention are manifest. No'lubrication is needed for "the movable parts forming the 'expansible chambers. The bearings forth shafts can be packed with lubricant and will not need attention; The-pump has no valves. Agreat capacity for the size of the pump can be procured. By rotating both displacement members, each are rotated about itsown axis and bal- ,anced so that undue vibration is eliminated. Due to the backing surfaces at thelocality of attach ment of the vanes tothe displacement members, undue bendingis prevented and long life is the result. The pump is quiet in operation and does notget-noisy in use. There a minimum'amount of'gfr ictionin the pump, so that forthe particular type of pump, a maximum efficiency is procured. Changes in the specific 'form of my invention, as herein described, maybe made within the scope ofwhat 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, two "relatively movable displacement members, said members having racing surfaces, portions of said surfaces being adapted to approach and recede from one another upon relative movement of said members, a plurality of flexible vanes-extending between said surfaces, clamp members engaging said vanes at their extremities and ach secured to one of said ,displacement members 'ior rigidly attaching said vanes to-said displacement members, said clamp members having surfaces receding from the surfaoes of the adjoining structure to form flaring recesses for the reception of said vanes, said vanes having free edgesintermediate the 1ocalities of attachment tosaid members, Walls having surfaces along which the free edges of said vanes move, said walls and vanes forming a plurality of expansible chambers and an inlet and an outlet successively communicating with said chambers upon relative movement of said dis placement members.

2. In combination, two relatively movable displacement members, said members having facing surfaces, portionsof said surfaces being adapted to :approach and recede from i one another upon relative movement .of said members, a plurality ofwanes means for immovably attaching at-definite localities an extremity of each of said vanes to one of said members at its denoted surface and the opposite extremities to the other of said members atits denoted surf-aceysaid vanes beingeformed with -.free edges intermediate the localities of at tachment to said members, said vanes being flexible throughout their extent and bending in a direction extending from one locality of attachment to the other, means at the localities of attachment of the vanes to one of said displacement members and having surfaces extending up to the localities of attachment for limiting the degree of curvature of said vanes beyond such localities, walls having surfaces along Which the free edges of said vanes move, said walls and vanes forming a plurality of expansible chambers and an inlet and an outlet successively communicating withsa-id' chambers upon relative move ment of said displacement inembers.

3. In combination, two -r elatively movable displacement members, said members having facing surfaces, portions of said surfaces being adapted to approach and recede from one another-upon relative movement of said members, a plurality of vanes, means for immovably attaching at definite localities an extremity 'of .eachof saidvanes to one of said members at its denoted surface and the opposite extremities .of said vanes to the other of said members at-saidsurfaces andbeirig formed with free edgesdritermediate the Ionianties of attachment to said members, said vanes being flexible throughout their extent and bending in a direction extending from one locality of attachment to the other, and means providing backing surfaces extendingto the localities of attachment of the vanes to oneof said displace"- ment members to prevent abrupt bending of the vanesat such localities, walls having surfaces along which the free edges of said vanes move, said wallsand vanes forming a pluralityofexpansible chambers and an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members.

4. In combination, two displacement members having facing surfaces, means for guiding said members for rotation about difierent 1axes, fto cause portions of said surfaces to approach recede from one another, means fordriving one of saidmembers, a plurality f flexible vanes rigidly attached at opposite extre ities to said members at said surfaces, saidvanes serving to drive the second'displacement member from the driven displacement member in the same direc tion of rotation, yieldab'lemeans for ,restrai ng reverse re lvativerotational movement between fald displacement members, said vanes having free edges intermediate the localities of attachment-to said members, walls having surfaces along which the free edges of said vanes move, saidwalls and vanes forming a plurality of expansible chambers and an inlet and an outlet successively coinmunicating with said chambers 11150 1 relative movement of said displacement members.

5. In combination, two displacement members having facing surfaces, means forguiding said members for rotation about different axes/to cause portions of said surfaces to approach and recede from one another, means for driving one of said members, a plurality of flexible vanes rigidly attached at opposite extremities to saidmem bers at said surfaces, said vanes serving to drive the second displacement member from the driven displacement member in the same direction of rotation, a torsional coil spring actin between said members for restraining reverse relative rota tional movement between said displacement members, said vanes having free edges intermediate the localities of attachmentto said members, walls having surfaces along which the free edges of said vanes moveQQsaid walls and vanes forming a plurality of expansible chambers and an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members.

6. In combination, a displacement member having a cylinder, a second displacement member having a hub received within said cylinder, means :for guiding said members for rotation about spaced axes, each concentric with one of said members, a plurality of looped flexible vanes rigidly attached at opposite extremities to said hub upon the exterior surface thereof and to said and an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members,

'7. In combination, two displacement members having facing surfaces, means for guiding said members for rotation about different axes, to

causeportions of said surfaces to approach and recede from one another, means for driving one of said members, a plurality of flexible vanes risidly attached at opposite extremities to said members at said surfaces, said vanes serving to drive the second displacement member from the driven displacement member in the same direction of rotation, a spring acting between said displacement members for restraining reverse relative rotational movement between said displacement members, said vanes having free edges intermediate the localities of attachment to said members, walls having surfaces along which the free edges of said vanes move, said walls and vanes forming a plurality of expansible chambers and an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members.

8. In combination, two displacement members having facing surfaces, means for guiding said members for rotation about different axes, to

cause portions of said surfaces to approach and recede from one another, means for driving one of said members, a plurality of flexible vanes rigidly attached at opposite extremities to said members at said surfaces, said vanes serving to drive the second displacement member from the driven displacement member in the same direction of rotation, resilient torsional means acting between said members for restraining reverse relative rotational movement between said displacement members, said vanes having free edges intermediate the localities of attachment to said members, walls having surfaces along which the free edges of said'vanes move, said walls and vanes forming aplurality of expansible chambers and. an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members.

9. In combination, two relatively movable displacement members, said members having facing surfaces, portions of said surfaces being adapted to approach and recede from one another upon relative movement of said members, a plurality of flexible vanes extending between said surfaces and overlying portions of the same, said vanes being curved in their direction of extent between said surfaces, clamp members overlying said vanes at their extremities and clamping said vanes to said members, said clamp members having-curved surfaces diverging from the denoted surfaces of said displacement members'the curvature of said surfaces of said clamp members extending in the same general direction as the curvature of said vanes, said curved surfaces of the clamp members limiting the flexing of the vanes at their 10- cality of attachment to the displacement members, said vanes having free edges intermediate the localities of attachment to said members, walls having surfaces along which the free edges of said vanes move, said walls and vanesforming a plurality of expansible chambers and an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members.

10. In combination, two relatively movable displacement members, said members having facing surfaces, portions of-said surfaces being adapted to approach and recede from one another upon relative movement of'said members, rotary means for procuring such movement between said mem bers, a pluralit of flexible vanes extending between said surfaces, said vanes being curved intermediate the localities at which said vanes leave said members, the curvature of said vanes varying during movement of said displacement members, clamps for attaching .the ends of said vanes to said surfaces of said displacement members, said clamps being disposed upon the concave surfacesof said vanes and having convex surfaces for engagement with said vanes, said convex surfaces being continuous up to the locality at which said vanes leave the displacement members and diverging outwardly therefrom, said vanes having free edges intermediate the localities of attachment to said members, walls having surfaces along which the free edges of said vanes move, said walls and vanes forming a plurality of expansible chambers and an inlet and an outlet successively communicating with said chambers upon relative movement of said displacement members.

STERLING O. STAGEBERG.

REFERENCES CITED I The following references are of record in the file of this patent:

UNITED STATES PATENTS 448,903 Great Britain June 17, 1936

Images