US1867198A - Rotary pump - Google Patents

Description

C. F. WAITE ROTARY PUMP Filed April l0. 1930 July `12, 1932.

f 1.,/ A w l Patented July 12, 1932 UNITED STATES PATENT ol-*lucaA CHABLES'F. WAITE, OF SOMERVILLE, MASSACHUSETTSLAS-SIGNOB 0F ONE-HALF'T ARCHIBALD W. JOHNSTON, OF BRIDGEPOBT, CONNECTICUT ROTARY PUMP applicati@ inea April 1o,

The present invention relates to rotary pumps and more particularly to rotary pumps oi` the general types' disclosed in my co-pending application Serial No. 432,061, iiled Februar 28, 1930. f

The o ject of the present invention is to provide improvements in rotary pumps with a'particular view toward smoothness of operation.

With thisl object in view, the principal feature of the present invention comprises a rotary pump having a rotor, a piston reciprocating diametrically in the rotor, and eccentric positioning means for the piston, to-

gether with means whereby relative movement between the piston and the eccentric positioning means is availed of to complement the discharge of the piston. This complementary discharge is arranged to occur out of phase with the discharge brought about by the reciprocation of the piston,whereby an overlap of discharge eflectA is obtained,

tending to smooth out any pulsations which mi ht exist in the outlet.

ther features of the invention consist in certain novel features of construction, combinations and arrangement of parts hereinafter described and particularly defined in the sectional end elevation of one form of pump according to the present invention; Fig. 2 is an end elevation of the pump shown in Fig. 1 with the end plate in place; Fig. 3 is a sectional side elevation of a modified and in some which engages with-the cylindrical surfaces ,14 and 16 of the casing, and is counterbored to provide an' inner 'cylindrical surface 18.

The rotor is also provided with a diametrical In the accompanying drawing, Fig. 1 is a 1980. `Serial No. 443,054.

- ecc'entrically of the rotor axis.

casing is provided with portsA The pum or clockwise rotation of the ro- 32 and 34.

tor, the ports 32 and 34 are respectively inlet and outlet ports.

The construction thus far described is similarto thatdisclosed in my co-pending applicati-on Serial No. 424,208. According tothe present invention, the walls of the rotor areprovided with a series of radial openings indicated at 36v and 37. The chambers included between-the ends of the shuttle block 24 and the internal surface 18 of the rotor undergo variations in volume, due to reciprocations of the shuttle block with respect to the piston, and these variations of volume are made use of to effect va discharge which is comple.- mentary to and out of phase with the main discharge of the piston 20. It will be seen from Fig. 1 that two of such internal chambers are provided, one of which is indicated at 38 and the other at 40. Upon rotation of the rotor in a clockwise' direction from the position of Fig. 1, the chamber 38 will increase in volume and fluid will be drawn into it through the openings 36, whereas the chamber 40 will decrease in volume and the Huid contained therein will be forced outwardly through the openings 37. The chamber 38 will continue to increase in volume and the chamber 40 will decrease during 180 rotationl of the rotor. The openings 36 and 37 are so disposed asto span the cylindricalsurfaces 14 and 16 of the casing, so that immediately upon advancement from the indicated position, the'leading suction opening 36 will draw fluid into the space 38 and the leading discharge opening 37 will have `liquid forced out through it. During thisoperation, the

piston 20 acts in its normal manner, as described in the co-pending a plication, givv mg a pumping stroke for eac rotation of the rotor. The main and complementary pum ing eiects obtained by the iston and y the changes in volume of t e cham- `bers 38 and 40 are outofphaseby 90. Therefore, the maximum complementary pumping eiect occurs at a time when the mam pumping eiect is zero, andvice versa. Therefore,

.ing 'ferred According to'this construction, the

`which reciprocations take place along axes at right angles to eachother. The piston reciprocates along the axis of the diametrical groove of the rotor, and the shuttle reciprolcates in eiect along the axis of the transverse groove of the piston.

The eccentric pin 28 may be ixed in posi- 'l tion, but where it is necessary to vary the 'volume of discharge or to maintain a con stant pressure under varying conditions, the adjustable eccentric described in my oo-pendapplication Serial No. 432,061 is preend plate 42 of the casing is provided with a chamber 44 having a plunger 46 which carries the eccentric pin 28. The plunger is acted upon by a spring to urge t e pin into eccentric position. -Two control openings 52 and 54 which are cored in the end plate connect respectivel with the dischargle and inlet of the pump. increase of disc arge pressure acts through the opening 52 to depress the plunger 46 and thus to move the pin 28 into a. position morenearly concentric with the rotor, thereby reducing the discharge. The openin 54 is provided to bleed the space below the unger46 of any li uid which may leak past t e plunger. It will 4e seen that the adjustable eccentric acts upon both the main and auxiliary pum ing means in a similar manner. Thus, as e yeccentric is moved towards its center position, the stroke of the piston 20 is decreased and moreover,` the variand do not vary as condltion, the rotor atlons 1n the volumes of the internal chambers 38and 40 are diminished. When the eccentric reaches a position concentric with the rotor, the piston 20l remains in its mid "le position and does not reciprocate in the rotor. Also, the spaces 38 and 40 are of equal volume the rotor rotates. In this rotates` idly without pumping any uid. It will be. noted that under such conditions, agitation of the Huid.

The pump marked im rovement in the smoothness of discharge" tlhrough the overlappingV 'of the main and complementary discharges. Inasmuch as the complementary discharge, however, is less than the main discharge, pulsations may not be entirely lavoided.

there is practically no described above produces a` still i further improvement in the smo thness of operation may be attained by the construction shown in Figs. 3 to 6, wherein pumping eiectspra'ctically equal in magnitude but out of phase with eachother are produced. In

this construction, the casing 8 and end plate 42 are-identical with those described above. The rotor iss/imilar to the rotor 10 except that it is not required to be counter-bored. l

The rotor'is continuouslyv driven by a shaft 61. A diametricall groove 62 having parallel walls is provided, as before.v The plston 64 comprises an integral structure having two curved end pieces 66 connected by a web 68 of considerably less depth and Width than the end pieces. The shuttle 70 is of the same length as the web 68 but is somewhat narrower than the piston. The shuttle is pron vided with an undercut groove 72 of greater width than the web 68, whereb the shuttle may tit over the web 68 but out o engagement therewith, lso that /arelative reciprocating movement between the piston and the shuttle may take place. The shuttle/has an opening 74 to receive the eccentric pin 28. Each edge face 76 of the shuttle block has a pumping 'area substantially equal to the effective pump- .ing area of each face of the piston. The r0- tor is provided with a plurality of radial openings 78. As shown 1n Fig. 3, a number i of these openings may be arranged longitudinally of the rotor. As shown in Fig. 5, the vinternal chambers '82 and 84 between the shuttle and the rotorl un ergo variations in volume as the rotor rota es. In Fig. 4 the space 82 is reduced practically to zero and the s ace 84 is of maximum volume. In turning c ockwise into the position of Fig. 5, the space 82 'increases in volume, thereby sucking liquid from the inlet, and the space 84 diminishes in volume, thereby forcing liquid into the discharge. The stroke of the shuttle is measured by the combined width ofthe passages 82 and 84. For equal pumping eiects, the

stroke and etlective area of the iston 6() and of the shuttle 70 are equal. y this construction, the overlapping of equal discharges which are half a stroke out of phase with each other produces a practically uniform pressure in the outlet. inasmuch as the internal space under the shuttle 70 may eventually become filled with liquid, the web 68.is made of reduced 'depth to provide a clearance space 86. As shown in Fig. 3, when the shuttle reciprocates with respect to the piston, the fluid which may be trapped in the groove 72 is .free to iiow over the web 68 from one side to the other thereof,

seen, as in the case of the pump ofFi 1 and 2, that the adjustable eccentric a ords particular advantages inthat it etfectually controls both the main and complementary pumping actions. Thus, as the eccentric is moved toward the central position, both the piston and the shuttle are brought toward their middle orv inactive positions.

Havin thus described the invention, what is claimed is: 4

1. A rotary pump having, in combination, a rotor, a piston mounted for reciprocation in said rotor and provided with a groove, eccentric positioning means in said groove reciprocating with respect to the piston, passages in said rotor leading to an internal pumping chamber defined by surfaces of the rotor'and said eccentric positioning means, whereby the reciprocation of said means relatively to the rotor surface produces a pumping effect complementary to the operation ofthe piston.

' 2. A rotary pu`mp having, in combination, a rotor, a piston mounted for reciprocation in said rotor and provided with a transverse groove, a shuttle block received in the transverse groove, means for maintaining the shuttle block eccentrically of the y rotor whereby rotation of the rotor causes pumping `reciprocation of the piston relatively thereto and of the shuttle relatively to the piston, passages in said rotor leading to an internal pumping chamber defined by surfaces of the rotor and shuttle whereby the reciprocation of the shuttle relatively to the rotor surface produces a pumping effect complementary to the operation of the piston.

3. A rotary pumpv having, in combination, a rotor, a piston adapted to slide radially lin said rotor, a shuttle adapted to slide radiallyl in said piston, the directions of movement otthe piston and shuttle being at right angles to4 each other, a pivot eccentrically maintained in the pump and carrying said shuttle, whereby ,rotation of the rotor causes reciprocation of the piston and shuttle relatively to each other and the rotor, an internal pumping chamber in said rotor defined by walls of the rotor and said shuttle whereby the reciprocation of the shuttle causes, by its movement relatively to the rotor wall2 a pumping -effect auxiliary to that of the piston.

` 4. A rotary pump having, in combination,

Va rotor having a diametric passage, a piston reciprocating in the'passage and provided with a transverse groove, a shuttle block received in the transverse roove, means for pivoting the shuttle bloc eccentrically of the rotor whereby rotation ofthe rotor causes reciprocation of the piston relatively, thereto and of the shuttle relatively to the piston,.ad ditional passages through said rotor leading into an internal pumping chamber defined' by surfaces of the' shuttle and rotor, whereby movement of the shuttle during rotation of the rotor produces a umpng eEect complementary to and out o phase with the pumping eiect of the piston.

5. A1 rotary pump having, in combination, a rotor, a piston mounted for reciprocation in said rotor and provided with a groove, eccentric positioning means in said groove reciprocating with respect to the piston, passages in said rotor externally spanning substantially the same arc asthe iston andlead'- ing to. an internal pumping c amber defined by surfaces of rthe rotor and said eccentric positionin means, whereby the reciprocation of said means relatively to the rotor surface produces a pumping effect complen groove, a shuttle block received in the transverse groove, means for maintaining the shut- Y tle block eccentrically of the rotor whereby rotation of the rotor causes pumping reciprocation of the piston relativelysthereto and of the shuttle relatively to the piston, passages in said rotor externally anning substantially the same arc as the piston and leading to an internal pumping chamber defined by surfaces of the rotor and shuttle whereby the reciprocation of the shuttle relatively to the rotor surface produces a pumping effect complementary to the operation of the piston.

7. A rotary pump having, in combination, a casing having inlet and outlet chambers and sealing surfaces between the chambers, a rotor having a diametrical opening, a piston reciprocating in said opening and having a transverse groove, a shuttle block in the groove of the piston, means for maintaining the shuttle block eccentrically ofthe rotor,

tively thereto and of the shuttlerrelatively to the' piston, the internal surfaces of the rotor and the shuttle forming chambers of variable volume,4and the rotor having passages leading from said chambers and displaced from the transverse groove and externally spanning substantially the same arc as the piston.

8. A rotary pump having, in combination, a rotor, a piston mounted for reciprocation in saidl rotor and provided with a transverse groove, a shuttle block received in the transverse groove, means for maintaining the shuttle block eccentrically of the rotor whereby rotation of the rotor causes pumping reciprocation of the piston relatively thereto and of the shuttle relatively to the piston, passages in said rotor leading to an internal pumpingr chamber defined by surfaces of the rotor and the shuttle and piston, whereby therreciprocation of the shuttle relatively to thev rotor surface and the piston produces a pum ing piston.

9. A rotary pump having, in combination,

a rotor having a diametric passage, a, piston reciprocating in the passage and rovided with atransverse groove, a shuttle lock received in the transverse groove, means for pivoting the shuttle block eccentrically of the rotor' whereby rotation of the rotor causes reeiprocation of the piston relatively thereto the rotor wherebyrotation of the rotor causes reciprooation of the piston relativel thereto and ofthe shuttle relatively to the-piston, the reciprocation of said shuttle relatively to the piston being limited by the Walls of the rotor ening the diametrlc passage, additionall passages through saidrotor leading into the I0 internal pumping chamber dened by the sur faces of the shuttle and rotor and piston, whereby movement of the shuttle during rotation of the rotor produces a pumpin effect complementary to and outof phase with the 35 pumping effect of the piston.

11. vA rotary pump having, in lcombina tion, a rotor, a. piston mounted for reciprocation in said rotor and .provided with a transn verse groove, a shuttle block received in the transverse roove, means for maintaining the shuttle bloc eccentrically of the rotor where= by rotation of the rotor causespumping Vrecxprocation of the pistony relatively thereto passages'in said rotor leadingtoan internal y pumpmg chamber dened bysurfaces of the rotor and shuttle whereby Ythe reciprocation of the shuttle relatively' to the rotor surface produces a pumping effect complementary to the operation of the piston, and means for ad- ]usting the .eccentrioity of said 'shuttle block to control both the main and complementary pumping eects.

12. A. rotary pump having, in combination, a. rotor, a piston mounted for 'reciproca- 1 tion in said rotor andprovided with a groove, eccentric positioning means in said groove reciprocating with'respect to the piston, passages in said rotor leading to. an internal l andof the shuttle'relatively to the ipiston,"

shuttle whereby the reciprocation of the shut- 'ously to control both pum and of the shuttle relatively to the piston,

A pumping chamber defined by surfaces of the? rotor, and sa1d`eccentric positioning means,

centricity of said positioning means to oon;-

- trol both the main and complementary pumping effects.

' 13. Arotary pump having, in combination, a rotor, a piston Imounted for reciprocation in said rotor and provided with a groove, ec\ centric positioning means in saidfgroove reelprocatlng with respect to the piston, passages in said rotor leading to an internal pumpingv chamber defined by surfaces ofthe rotor, and said eccentric positioning mea whereby the reciprocation of said means relativel to the rotor surface produces a pumping el ect complementary to the operation of the piston, and means controlled bythe discharge' pressure to vary the eccentricity of the positioning means and thereby simultaneously to control both pumping ei'ects.

14. A rotary pump having, in combination,

a rotor, a piston mounted for reciprocation in said rotor and provided. with a transverse groove, a shuttle'block received in the transverse groove, means for maintaining the shuttle block veccentrically of the rotor whereby rotation of the rotor causes umping reciprocation of the piston relative y thereto and off the shuttle relatively to the piston, passages in said rotolgleading to an internal pumping chamber dened by surfaces-of the rotor an tle relatively to lthe rotor surface produces a t complementary to the operapumping e ec tion of the piston, and means controlled by the discharge pressure tovary the eccentricity im' of said shuttle block and thereby simultaneing effects.

In testimony whereof have signed my name to this specification.

' CHARLES F. WAITE..

whereby the reciprocation of said `means relativelg to the rotor surface produces a pumping e ect com lementar to the operation of u' the piston, an means or'adjusting the ec-

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