US 2435279 A
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Description (OCR text may contain errors)
Peb. 194g. E E HUBACKER 2,435,279
PUMP, VANE TYPE I Fild oct. 25, 1943 2 sheets-sheet 1 E. EHUBACKER 2,435,279
PUMP, VANE TYPE Filed oct. 25, 1945 2 sheets-sheet 2 Patented Feb. 3,'
UNITED STATES PATENT omer:
Earl F. Hubacker, Highland Park, Mich., asslgnor to Borg-Warner Corpor corporation of lllin is Application October 25, 1943, Serial No. 507.570 2 claims. (oi. 10s-136) I'he present invention relates to pumps and motors, particularly of the rotary reciprocable l vane type.
It is the principal object of this invention to simplify the construction or motor such as contemplated herein, and to improve the eillciency and operationthereof.
Another o bject of this invention is to provide simple and eiective means for admitting pressure fluid under the radially inner portions of the vanes or blades thereby to assist 4in urging the blades into sealing engagement with the bore of the pump or motor performed by the novel instrumentalities disclosed herein which are eective regardless of the direction or rotation of the rotor structure. A further object is to provide the individual blades with the means which permits the pressure uid to enter the space under each blade. A still further object is to provide a blade that is of novel construction and which is eiective in the performance of the before mentioned function. Another object is to provide a seal between one side of the blade and the proximate face or wall of the slotted seat for the blade in the rotor body.
Additional objects, aims, and advantages of the present invention will be apparent to persons skilled in the art after the construction and operation of the pump and blade is understood from the herein description.
It is preferred to accomplish the numerous objects of this invention and to practice the same in substantially the manner hereinafter fully described and as more particularly pointed out in the appended claims, reference being made to the accompanying drawings that form a part hereof.
Fig. 1 is a, vertical section taken transversely through the axis of a three cylinder` or triple work chamber, pump or motor rotor and disclosing the instrumentalities for practicing a form of the invention contemplated herein;
Fig. 2 is a vertical section taken on the plane of line 2-2 on Fig. 1, and looking in the direction of the arrows;
Fig. 31s an enlarged view showing details of the vane or blade and demonstrating its manner of operating;
Fig. 4 is a transverse section made through the vane or blade;
Fig. 5 is a sectional View of a two cylinder or two chamber pump or motor taken on the plane of line 5 5 on Fig. 6, showing a modiiled form of the invention contemplated herein;
Fig. 6 is a, sectional view taken substantially on the plane of line 8 3 on Fig. 5;
of a vaned Atype of pump i housing. This function isl ation, Chicago, Ill., a
Fig. 7 is an enlarged elevation of the modified rotor blade, the adjacent structure shown in section on the plane of line 1-1 onFig. 8; and
Fig. 8 is la transverse section taken on the plane of line 8-8 on Fig. 7.
The drawings are to be understood as being more or less schematic for the purpose of disclosing typical or preferred forms of the structure contemplated herein, and in these drawings like reference characters are employed to identify the same parts wherever different views.
The pump or motor structure which is illustrated in Figs. 1 and 2 comprises a, hollow housing 5 of a generally cylindrical shape having an open side that is closed by the removable closure plate 6. This housing has an inlet stub l and an oppositely disposed outlet stub 8. There is an inlet passageway 9 extending approximately two thirds of the circumference of the housing, and alongside said passageway 9 there is an outlet passageway` It which also extends around approximately two-thirds of the circumference of the housing. These passageways 9 and It communicate with the respective stubs 'i and 3 intermediate their end portions, and it will be `seen that the end portions of these passageways overlap each other in the manner shown in Fig. l. The passageways 9 and il! are non-communicating with respect to each other. and their overlapped portions are parallel.
The bore of the housing preferably consists of a cylindrical liner il and annular side plates i2 and i3 that provide guiding means for the rotor structure. The rotor body it fits the cylindrical liner and i-ts ends engage the side plates i2 and i3 as shown in Fig. 2. The trunnion i5 of the rotor body is journaled in an axial bearing boss it on the closure plate 6 of the housing. and the other trunnion ofthe rotor body is journaled in an aligned bearing boss i8 on the side of the lhousing A prime mover may be suitably coni9 are made in sageway 9 and the interior of the bore, and a plurality of outlet or discharge openings 2U made in the liner, alongside the respective inlet openings, provide communication between the bore and the outlet passageway i0.
these parts appear in the of the housing bore which establish communication between the inlet pas- The rotor body Il has a central bore 2l, and it is also provided with a plurality of outwardly opening longitudinal slots 22, the latter being radially disposed and provide pockets or guiding means for a plurality of vanes or blades 213 that are disposed therein. These vanes or blades comprise elongated metal strips that are of a length to extend from side to side of the rotor body I4 with their outer ends engaging the inner faces of the annular liner plates I2 and I3 that restrain said vanes or blades against longitudinal displacement. There are preferably eight of these blades 23. but it will be understood that the number may be varied in accordance with the service required or the particular specifications. By employing an even number of vanes or blades 23 it will be apparent that each blade is disposed in radial alignment with a diametrically opposite blade so that the blades are arranged in pairs in the manner shown. This disposition of the blades permits of a structure wherein during the operation of the pump, one blade of a pair will be moving inwardly while its cooperating or aligned blade will be moving outwardly with respect to their respective seats or guide pockets. This uniform and simultaneous movement of the blades of each pair is facilitated by means of a plurality of spacers 24, preferably in the form of pins, that are movable longitudinally in guide holes bored radially through the rotor body i4 `in alignment with the slots or guide pockets 22.
The ends of these pins contact the inner edges of the vanes or blades 23, and since said pins 24 are all of the same length all of the blades are uniformly spaced from their diametrically opposite or companion blades. This predetermined spacing of the blades is maintained constantly through each rotation of the rotor body. Furthermore, this arrangement dispenses with the use of springs and similar elements to urge the blades outwardly into sealing engagement with the bore surfaces of the pump housing.
The inner bore of the pump housing comprises triple cam surfaces including offsets 25 of arcuate shape that are cut into the bore and provide the compression chambers through which the outer edges of the blades 23Awill sweep during each stroke thereof. These cam offsets are flanked by three cam rises 26. The cylindrical surface of the rotor body engages these raised cam portions 26 which center said rotor by providing a tripod-type of bearing thereof. The cam surfaces 25 and 26 provide camming means, which positively move eachl pair of blades in unison and also bodily independently ofthe rotor body i4.
or raised portion 26- the diametrically opposite blade will be in the deepest portion of the opposite cam surface so that these aligned blades will move respectively inward and outward simultaneously and at the same speed of bodily radial movement and constantly at the same distance apart.
VWhen the rotor is moving. a blade entering one of Referring to Figs. 3 and 4. it will be seen that the relative transverse dimensions of the guide slot 22 and the blade 23 are such that there is sufElcient clearance between these parts to per mit the blade to cant or tilt with respect to the the direction of rotation of the rotor i4 as determined by the relative pressures on the opposed sides thereof, this in turn depending on whether the same is being operated as a pump or a motor. In the tilted position shown the trailing face of the blade will be in firm engagement with the adjacent corner :i: of the slot thereby to provide a seal extending the length of the blade and slot. The longitudinal movement of the spacer rods 2l exert a certain amount of force against the inner edge y of the blade to urge the blade bodily outward so that its other edge 2 will form a seal against the surfaces of the housing bore through which it sweeps.
The compression of the fluid in the chamber in front of the blade. when used as a pump and rotated in the direction indicated by the arrow, will cause the canting or tilting in the manner shown in Fig. 3, and when the structure is used as a motor the blade will be tilted by the force exerted against it by the impelling fluid. In order to admit the compressed fluid to the space 21 between the inner edge y of the blade and the bottom of the guide slot 22 both the faces of the blades are provided with a plurality of relief channels 28 through which the pressure fluid will be fed into the space 21. outwardly directed force of the pressure fluid against the edge y of the blade will seal the outer edge a against the bore surface. Thus the high pressure on one side of the blade is positively divided and sealed against the low pressure on the trailing side of the blade. In this connection it is assumed that the revolution of the rotor is in the direction indicated by the arrow thereon. The arrangement and structure described permits the rotor being revolved in either direction, and likewise adapts the structure for use as a motor or a pump without alteration.
In Figs. 5 to 8, inclusive, a modified structure is shown that comprises a pump or motor having two oppositely disposed compression chambers 30a and 30D. The assembly in this modiication is of smaller diameter than in the form illustrated in Figs. 1 and 2 by reason of the more compact disposition of the component parts.A
block 32, and the rotor body 35, that is anchored to.
the axially disposed actuating shaft 36. One end ofthis shaft extends into a socket 31 in the central portion of side member 33, and the other portion of saidshaft passes through a central bore 38 in the other side member 34vfor connectionl to suitable driving means (not shown) that may be any prime mover.
The sidcmember 33 has a segmental passageway 39 communicating the inlet 33a with cham- Ibers 30a and 30h. The other side member 34 has a similar segmental passageway 40 communicating the discharge port 34a with the chambers 30a. and 30h. These ports 33a and 34a may have their functions reversed depending upon the desired direction of rotation or whether being operated as a pump or a motor.
In this manner the radially axis thereof to provide pockets or guiding means for the vanes or blades 42. Relief channels 43 are made in the faces of these blades through which the pressure iuid will pass yto the spaces I4 back of the inner edges of the blades to urge them outwardly so that the other or outer edges of said blades will eilect a positive sealed contact ywith the opposing work faces of the pump ormo- In order to insure the above-mentioned tor. sealed contact and also to permit retraction and projection of the blades into and out of the guide slots di elastic means such as springs 45 are` placed back of these blades. Recesses 43 are -made in the inner edges of the blades to receive y the outer portions of said springs, and wells 41 are bored in the bottoms of the slots Il to seat the other portions of these springs. ,v
Referring to Fig. 8, it will be seen that, while the slot 'l ll'ias parallel side walls or faces, the proximate cr opposing side faces of the blade 42 converge towards each other in an outward direction. -In other Words, the blade d2 is of a tapered construction with the widest portion innermost in the slot 6l, with the result that the force exerted by the fluid in the chamber in front of the blade will cause the blade to cant or tilt until a 4portion of its surface contacts the adjacent wall of the slot, thus providing a seal along the length of the blade and slot. This sealing position, as shown in Fig. 8, is quite eiective for providing a clearance between the other face of the tilted blade and its confronting slot wall for admitting the pressure uid through the-slot to the inner edge oi' the blade thereby toV urge the i blade outwardly into sealing position or engagement with the work faces of the compression chambers.
It will appear that either the tapered construction of blade of Fig. 8 or the straight construction of Fig. 4. may be used interchangeably.
While this invention has been described in detail in its present preferred form or embodiment, it will be apparent to those skilled in the art, after understanding the improvements contemplated herein, that various changes and modications may be made therein without departing from the spirit or scope thereof., It is aimed in the appended claims to cover all such changes and modiiicatiohs.
1. A rotary uid pressure device of the vanedtype adapted for rotation in two directions for providing respectively a pump and a motor', said device comprising a cylindrical housing having therein a bore defining awork chamber with cam surfaces; a rotor body rotatable in two directions in said bore; radial guide slots in said rotor having parallel unbroken side walls; and blades op` erable in said guide slots and having plane side faces converging towards each other in a direction radially outward with respect to the rotor axis whereby during either rotative movement of the rotor a titlting of the blades is eective to engage a tapered face of each blade in dat surface contact with the adjoining slot wall and to effect a clearance space between the other face of the blade and the other wall of the slot; and transverse channels in the radial inner regions of each iblade. said channels and said clearance spaces together providing the sole means for conducting pressure iiuid from said work chamber to the inner edges o said blades during either` direction of' rotation of said rotor.
2. A rotary iluld pressure device of the vanedtype adapted for rotation in two directions for providing respectively a pump and a motor, said device comprisinga cylindrical housing; side by side inlet and outlet passageways in said housoutlet passageway; a rotor body rotatable in said liner bore;- radial guide slots in said rotor having parallel unbroken side walls; and blades= operable in said guide slots and having plane side faces converging towards each other inl a direction radially outward with respect to the rotor axis whereby during either rotative movement of the rotor a tilting of the blades is effective to engage a tapered ltace of each blade in at surface contact with the adjoining slot wall and to eect a clearance space between the other face of the blade and the other wall of the slot; and transverse channels in the radial inner regions of each blade, said channels and said clearance spaces together providing the sole means for conducting pressure uid from said work chamber to the inner edges of said blades during either direction of rotation of said rotor.
EARL F. HUBACKER..
REFERENCES CITED The following references are of record in the le of this patent:
Austria 1912 Patent No. 2,435,279.
Certieate ef Con'ectcn e EARL F. `HLUBMJKER l l r It is hereby certied that', error appears in the printed speccation of the above .thereof read there or; and that the said Letters Patent should be reed with thm numbered patent reguiring correction as follows: Column 3, line 52, for the word ecton therein that the same may conform to the record of the case in thePatent.
Signed and sealed this 4th dayr of May, A. D. 1948.
THOMAS F. MURPHY, V wrmt Qomlwcw 0f Patent- February s, 1948.