US2729165A - Rotary pump - Google Patents

Description

ROTARY PUMP 3 Sheets-Sheet l Filed NOV. 5, 1954 mkv.

NMVTN Jan. 3, 1956 M. w. Klar-:MER

ROTARY PUMP 3 Sheets-Sheet 2 Filed Nov. 5, 1954 1 y lzfenor: Mar/zzz FB Zl @ramer @Mana/c; @ma

Jan. 3, 1956 M. w. KRL-:MER

ROTARY PUMP 5 Sheets-Sheet 5 Filed Nov. 5, 1954 Wdrz'n CEJ/ @wmf/94pm United States Patent O ROTARY PUMP Martin W. Kremer, Bridgeview, Ill. Application November 5, 1954, Serial No. 467,174 7 Claims. (Cl. 103-5) This invention relates to improvements in a pump for liuids and refers particularly to a uid pump of the rotary type.

Rotary iluid pumps have heretofore been proposed, but in all cases difliculty has been encountered, due to the rotary movement of the cylinders, in drawing the fluid to be pumped into the cylinders. In view of the fact that the compressing action of such pumps takes place at the outer portions of the cylinders, that is, at the radially outward side of the pistons, diculty has been encountered in introducing the fluid to be pumped into the ends companying drawings and In the drawings, Fig. l is a sectional View taken through the pump comprising the present invention.

Fig. 2 is a sectional View taken on line 2`2 of Fig. l. Fig. 3 in an elevational view of the pump casing with the rotary cylinder block removed. 1

Fig. 4 is a detailed sectional view taken on line 4 4 of Fig. 2. v

Fig; 5 is a detailed sectional View taken on'liile 5-5 of Fig. 4.

Fig. 6 is an elevational view of the rotatable cylinder block removed from thepump housin Fig. 7 is a top plan View of the block shown in Fig. 6. Fig. 8 is an end elevational view of the pump illustrating particularly the gear for driving the rotatable cylinder ock.

Referring in detail to the drawing, the pump comprising the present invention includes a housing 1 which, at

. der block 3 is rotated and the 10. A bracket 11 is secured to the end of the housing which carries ring 4 being attached thereto by screws 12. The ring 4 functions to confine the rotating cylinder ing assembly 8 scribed. The bracket 11 functions to confine the bearing 3, a driving adapted to mesh with the teeth of the spur gear 16 whereby the rotatable cylinder block 3 may be rotated within the housing 1.

pins 28 are carried which in turn carry pistons 29. The arrangement is such that one piston, piston 25, is

hereinafter more fuly described.

The bearing assembly S comprises a cup-shaped member including a cylindrical ange portion 32 and a wall portion 33. A substantially reciprocally carried. The piston 43 is provided with a transverse bore 44 adapted for the reception of the stub shaft 31. The wall portion 40 of the cup-shaped member is provided with a slot 45 through which the stub shaft 31 is adapted to extend.

It can readily be seen that when the rotatable cylincrankshaft member 22 is enseres' driven', said member rotates about the axes of the'stub shafts 30 and 31 for predetermined positions of the pistons 36 and 43. The arrangement is such that the pistons 36 and 43 may be moved within the cylinders 35 and 42 respectively and hence the center of rotation of the crankshaft member 22 may be changed. When the center` of rotation of the crankshaft member, 22l is changedy the stroke of the pistons 25 and 29 within the cylinders 20 is changed. v y

Closure plate 9 is provided with a bore 46 which connects into the upper portion of cylinderV 35. Said closure platel is also provided with a bore 47 which connects into`thelower portion of cylinder 35. In similar manner, the bracket 11 is provided with bore 48` which con ects into the upper portion of cylinder 42 and said bracket is also provided with a bore 49 which connects into the lower portion of cylinder 42. Nipples 50 are threadedly positioned in all of the bores 46, 47, 48and 49 whereby a hydraulic fluid may be introduced into the upper or lower ends of the cylinders 35 and 42. The nipples 50 may be connected to a source of hydraulicuid under pressure (not shown) which may be controlled by suitable valves 51. In this fashion the stroke of the pistons within the rotatable cylinder block 3 may be controlled and `it will be noted that the pistons 36 and 43 may be moved upwardly or downwardly whether the rotatable cylinder block 3 is rotating or is stationary. Hence, the arrangement provides a convenient means for quickly changing the stroke of the pistons.

The recess `2 is provided with an offset portion 52 which is adapted tol receive an intake ring 53. The ring 53 is of substantially L-section and provides an annular recess for the reception of an annular boss 54 carried by the body 19 of the rotatable cylinder block 3.` The ring 53 carries an annular boss 55 which registers with a conforming annular recess 56 provided in the boss 54. The arrangement is such that ring 53 is rigidly secured to the housing 1 and during rotation of the cylinder block, the' boss 54 rides within the ring 53, boss 55 and recess 56 being in snug slidable engagement.

An arcuate intake groove 57 is provided in the vboss 53 opening to the face thereof throughout a predetermined arc. The housing is provided with a threaded intake opening 58 which, by means of bore 59', communicates with the intake groove 57 adjacent one end thereof. The intake 58 is adapted to be connected to a source of iluid to be pumped (not shown) and the intake groove is thus supplied with said fluid from the intake.

The body 19V of the rotatable cylinder block 3 is vprovided with a plurality of bores 59. At one end 60 ofeach bore 59, said bore opens into the annular recess S7 and during predetermined positions of each of the ends 60 as the block 3 rotates, said ends communicate with the intake groove. At all other positions, ysaid A ends are closed by the face of the annular boss 55. Each bore 59 from end 60 is inclined axially and outwardly toward a cylinder 20 and each bore communicates with an'upper portion of a cylinder, as at 61 in Fig. 6. The bores 59 are so inclined that when an end 60 of a predetermined bore is in communication with intake groove 57, the piston of the cylinder with which the bore communicates will be at its suction cycle. Thus, when the pistons are in their suction cycle, the outer end portions of the cor'- responding cylinders will be in communication with the intake 58.

As an important feature of the present invention, it will be noted that bores 59 are inclined radially outwardly and that said bores lead fluid from a radially inner portion of the block (end 60 at recess 56) to a radially outer portion of the block (end 61 at a cylinder 20). Hence, during rotation of the block, the fluid carried in bores 59 is subjected to centrifugal force which tends to assist the suction in the cylinders in moving the fluid into the lcylinders during the intake stroke. l l

The housing 1 is also provided with a threaded dis.-

charge opening 62 which communicates withv a bore 63 which connects with a discharge groove 64 provided in the body 1 adjacent the outer ends of the cylinders 20. The groove 64 spans a predetermined angle of travel of the block 3 which covers the compression or discharge cycle of the block, the groove 64 increasing in crosssectional area toward bore 63'.

To seal one cylinder from its adjacent cylinders, a plurality of blade seals 65 are loosely positioned in slots 66, one slot being provided between two adjacent cylinders. By virtue of the loose positioning of the blades 65 in the slots, centrifugal force, when the block 3 rotates, urges said blades outwardly into sealing contact with the inner surface of the recess In the operation of the device, the rotatable cylinder block 3 is rotated by engagement of a driving pinion with the spur gear 16. During the rotation of the block 3 the piston 25 secured to piston rod 23 causes the crankshaft 22 toV rotate about the axes of the stub shafts 30 and 31. During the rotation of the crankshaft the cylinders occupy different radial positions relative to the axis of rotation of the crankshaft and consequently said pistons reciprocate within said cylinders.

At a predetermined phase of operation of the device certain of the pistons will be moving inwardly establishing a conditionrof reduced pressure or suction in the upper portion of the cylinders. The arrangement is such that when a predetermined piston is moving radially inwardly the bore 59 associated with the cylinder in which saidV piston moi/es will be in communication with the intake groove 57. Due to the suction established in the outer portion of the cylinder and also due to the centrifugal force established by the rotation of the block 3, fluid will be'drawn into the outer portion of said cylinders. When arpredetermined piston reaches substantially inner deadcenter position, communication of the interior of the cylinder with the intake groove will have been broken. At this period of operation the cylinder in question will have moved adjacent the end of the discharge groove 64 and hence during the outward movement of the piston the uid previously introduced into the cylinder will be urged under pressure through the discharge groove to the discharge 62.

The ends 61 of the bores 59 enter the cylinders 20 at such position that for a portion of the compression stroke the end lopenings 61 are partially closed and for the remaining portion of the compression stroke they are completely closed. However, during the compression period that the ends 61 are partially closed by the pistons, the end 60 ofthe bore 59 in question will be closed by its contact with the face of the annular boss 66.

As hashereinbefore been described the stroke of the pistons may be changed by changing the position of the axis of rotation of the crankshaft member 22. The means for changing the position of the stub shafts 30 and 31 has been illustrated and described as being hydraulic. It is to be understood, however, that other means may be used for moving the stub shafts. For instance, said shafts may be moved by mechanical means such as by a cam or the like. Other specific aspects of the device may be changed without departing from the spirit of the invention and hence it is not intended that the invention be limited in scope except as necessitated by the appended claims.

I claim as my invention:

l. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block for rotation about an axis eccentric to that of the cylinder block, means rigidly connected to said crankshaft member for connecting one piston to said crankshaft member to cause mutual rotation of said crankshaft member and said "vylinder block about their respective axes, means for pivotally connecting the remaining pistons to said crankshaft member, said cylinder block being provided with a plurality of bores having inner ends and outer ends with reference to the radial, both ends of said bores being on the same side of the center of rotation of said cylinder block, said bores being connected at their radial outer ends to the respective radially outer portions of said cylinders, said casing being provided with an intake which communicates with the inner ends of said bores to conduct uid to the radial outer portions of the cylinders during the suction stroke of the pistons carried therein.

2. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, means for rotating said cylinder block, said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block for rotation about an axis eccentric to that of the cylinder block, means rigidly connected to said crankshaft member for connecting one piston to said crankshaft member to cause mutual rotation of said crankshaft member and said cylinder block about their respective axes, means for pivotally connecting the remaining pistons to said crankshaft member, said cylinder block being provided with a plurality of bores having inner ends and outer ends with reference to the radial, each bore being disposed along a chordal line and having both ends on the same side of the center of rotation of said cylinder block, said bores being connected at their radial outer ends to the radially outer portions of said cylinders, said casing being provided with an intake which communicates with the inner ends of said bores to conduct uid to the radial outer portions of the cylinders during the suction stroke of the pistons carried therein.

3. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, means for rotating said cylinder block, said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block for rotation about an axis eccentric to that of the cylinder block, means connecting said cylinder block and said crankshaft member for mutual rotation of said crankshaft member and said cylinder block about their respective axes, means for pivotally connecting certain of said pistons to said crankshaft member, said cylinder block being provided with a plurality of bores having inner ends and outer ends with reference to the radial, the outer ends of said bores being spaced a greater distance from the center of rotation of the cylinder block than the inner ends thereof, and both ends of each bore being disposed on the same side of the center of rotation of said cylinder block, said bores being connected at their radial outer ends to the radially outer portions of said cylinders, said casing being provided with an intake which communicates with the inner ends of said bores to conduct fluid to the radial outer portions of the cylinders during the suction stroke of the pistons carried therein.

4. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, means for rotating said cylinder block, Said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block for rotation about an axis eccentric to that of the cylinder block, means rigidly connected to said crankshaft member for connecting one piston to said crankshaft member to cause mutual rotation of said crankshaft member and said cylinder block about their respective axes, means for pivotally connecting the remaining pistons to said crankshaft member, said cylinder block being provided with a plurality of bores having inner ends closer to the center of rotation of said cylinder block than the outer ends thereof, each of said bores being disposed along a chordal line and the inner ends of the bores being disposed in advance of the respective outer ends in the direction of rotation of said cylinder block, both ends of each bore being disposed on the same side'of the center 'of rotation of said cylinder block, said bores being connected at their radial outer ends to the radially outer portions of said cylinders, said casing being provided with an intake which communicates with the inner ends of said bores to conduct fluid to the radial outer portions of the cylinders during the suction stroke of the pistons carried therein, said casing also being provided With a discharge which connects with the outer end portions of said cylinders during the compression .stroke of the pistons carried therein.

5. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block for rotation about an axis eccentric to that of the cylinder block, means carried by the cylinder block for changing the degree of eccentricity of said crankshaft member relative to said cylinder block, means rigidly connected to said crankshaft member for connecting one piston to said crankshaft member to cause mutual rotation of said crankshaft member and said cylinder block about their respective axes, means for pivotally connecting the remaining pistons to said crankshaft member, said cylinder block being provided with a plurality of bores having inner ends and outer ends with reference to the radial, said bores being connected at their radial outer ends to the radiaily outer portions of said cylinders, said casing being provided with an intake which communicates with the inner ends of said bores to conduct fluid to the radial outer portions of the cylinders during the suction stroke of the pistons carried therein.

6. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block for rotation about an axis eccentric to that of the cylinder block, hydraulic means carried by the cylinder block for changing the degree of eccentricity of said crankshaft member relative to said cylinder block, means rigidly connected to said crankshaft member for connecting one piston to said crankshaft member to cause mutual rotation of said crankshaft member and said cylinder block about their respective axes, means for pivotally connecting the remaining pistons to said crankshaft niember, said cylinder block being provided with a plurality of bores having inner ends and outer ends with reference to the radial, said bores being connected at their radial outer ends to the radially outer portions of said cylinders, said casing being provided with an intake which communicates with the inner ends of said bores to conduct fluid to the radial outer portions of the cylinders during the suction stroke of the pistons carried therein.

7. A rotary pump comprising a casing, an annular cylinder block carried in said casing for rotation therein, means carried by said cylinder block exteriorly of said casing for rotating said cylinder block, said cylinder block being provided with a plurality of radially disposed cylinders, a piston in each cylinder, a crankshaft member positioned within said annular cylinder block and journaled in said casing for rotation about an axis eccentric to that of the cylinder block, means rigidly connected to said crankshaft member for connecting one piston to said cylinder to cause rotation of sa'd crankshaft when said cylinder block is rotated, means for pivotally connecting the remaining pistons to said crankshaft member, vsaid cylinder block being provided with a plurality of bores one for each cylinder having inner ends closer to the center of rotation of the cylinder block than the outer ends thereof, both ends of each bore being disposed on the same side of the center of rotation of said cylinder Brock, and 'duw-r ends wiihrferince to 'the fadial; said radially outer potiohs ofl sid cylinders, 'si'd Y casing being provided with 'an intake which communicates with the inner ends of said bores to conduct` uid Yto the rdial outer portions of the cylinders during the suction stroke of the pistons carried therein, said casing also being provided with a discharge which connectswith the outer and References Cited inthe file of this 'ptent UNYr'D STATES PATENTS Levering July i6, 1929 muis Y May 4, 1937 whimerd July 12, 1938

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