US2576175A - Rotary piston pump - Google Patents

Description

Nov. 27, 1951 w. B. ESLEY ROTARY PISTON PUMP 3 SheetsSheet 1 Filed Aug. 11, 1949 i m F Wayne 8. Es/ey 1ME\TOR Fig.3

Nov. 27, 1951 w. B. ESLEY 2,576,175

ROTARY PISTON PUMP Filed Aug. 11, 15349 r 3 Sheets-Sheet 2 Wayne 8. Es/e y INVENTOR.

Nov. 27, 1951 w. B. ESLEY ROTARY PISTON PUMP s Sheeis-Sheet 3 Filed Aug. 11, 1949 Wayne B. Es/ey INVEN TOR Attorneys Patented Nov. 27, 1951 Wayne B.

.. .ROTARYPISTON PUMP Esley, Rochester, N. Y., assignor of onethird to Gerald Burns; one-third to Merlyn R. Sweet; andEone-tliird to HerbertBrueckner Application August 11, 1949; Serial No. 109,729

This invention relates to novel and useful improvements in pumps.

' An object of this invention is to pump a fluid into-and out of a pump chamber by means of a combination piston and valve which is rotative ly and reciprocatively mounted in the pump chamber, the piston having a pairof pockets or ports therein which communicate progressively with'the inlet and the outlet of the pump chamber to transfer the lifted fluid from the inlet to the outlet.

Another object of this invention is to operate a piston in a pump barrel or cylinder by means of an operating shaft which has a pair of pinions spaced from each other and fixed thereto;

the pinions being enmeshed with a pair of gears which. are carried by and fixedly secured to a cage, the cage beingrotatively mounted within the pump housing or case together with means for causing the piston to rotate and reciprocate while rotating.

Afurther object of this invention is to lift fluid" by a pumping action; which-action includes the reciprocatory movement of a piston together with full 360 degree rotation ofthe pistonjwhile it'Tis being reciprocated, thepump housing hay irig a cylinder within which the piston operates andl'suitable inlet and outlet membersto conduct. thelfluid. One oi thefeatures of such an arrangement is the smoothness of operation.

'Ihemean's for impartingsuch movement to the piston includes'a stationary member having a cam track so that a -camfollower rides in a path sub-- stantially defined as a sinusoidal wave, and the m'eansalso includes a rotary cage which is disposediin the pump. housing having a pair of longitudinal slots therein so as to guide the cam follower and also so as to impart rotary movement-to the cam follower; i

Another feature of the invention is the operation of the cage. (rotative movement) from' the torqueiofthe operating shaft which is 'delivered to the cage at two spaced positions, preferably at the front and rear of the cage thereby minimizing the torsional load in the cage and tending to cause a smoother operation of the cage.

Ancillary objects and features of'novelty will become apparent in following the description of the preferred form of the invention, illustrated in the accompanying drawings, wherein:

Figure l is a sectional view showing particularl'yfthe shape-of the housing; 'theinlet andoutlet communicating with the cylinder which" has the piston disposed therein;

Figure 2 is a sectional view taken on the line 2 Claims. (Cl. 103-457) commodating the 2-2 of Figure 1 and in the direction of the arrows; g

Figure 3 is a transverse sectional view taken substantially on the line 33 of Figure 2 and in the direction of the arrows;

Figure 4 is a plan view of the cam track which is formed in the structural member disposed within the pump housing for the purpose of providing such a cam track;

Figure 5 is a schematicview showing a flat development of the cam track together with related piston positions and valve port or pocket posi tions;

Figure 6 is a perspective view of the cage which is rotatively disposed within the housing and which is used for imparting rotative movement to the cam follower which is, in turn, reflected in rotative movement of the piston. V

Various types of pumps are well known in the art. There are'pumpswhich use the principle of reciprocating a piston by means of calm action, the reciprocation taking place while the piston is rotating.

The present invention improves the structure and hence, the operation of such pumps by the inclusion of the drive member which is termed integral with the cage III, while the other gear I4 is detachable. By the utility of such an arrangement the torque of the operating shaft I8 is transferred to rotative -movement of the cage I!) through the pinions Hand 22 at two spaced positions thereby providing a positive drive and thereby applying the torsional load in the cage I0 at two spaced points so that it will not be concentrated. This obviously lessens the tendency for exceeding the allowable shear in the cage.

The housing or case25 for the pump has a barrel or cylinder 28 formed integrally with one end thereof and includes an end plate 30. The end plate 30 has a bearing seat 32 therein acconventional anti-friction thrust bearing 34'. This thrust bearing supports the shaft 36'which is securedwithin the end 38 of the case In. V

The shaft I8 is" mounted in a bearing Ml which isdisposed ina suitable opening in the end plate 30' and also in a bearing 42 having a closed end,

which is carried by the housing 26'.

The pinions 20 and22 are fixed to the shaft I8 in such positionas to be enmeshed with the said gears l l and l2.-*-"I-he longitudinal axis orthe 4 i this condition of operation the arm I would have its rollers disposed substantially at the apex of each rise in the sinusoidal wave. At this time the pocket 68 is ready to become communicated with the inlet 60. As the piston rotates and is drawn inwardly of the cylinder 28,

structure corresponding to full exhaust in anyv ordinary reciprocation type pump. The members 46 and 48 may be fixed within the housing 26 by any suitable means, as the dowel pin 54 illustrated in Figure 2; The peripheral flange 56 abutting an end portionof'the' housing 26 assists in maintaining the-members. 48 in firm locked position within the housing 26.

An inlet 6!! communicates with the cylinder'EZB forming the pump chamber and an outlet 62 disposed at substantially Q0 degrees with respect;

thereto also communicates with the pump chain-e ber; q Therpiston-gs is a combination pistonkand valve, sinceitais used .in the; capacity-of api'ston and it is also used for opening and closing the inlet and outlet Eli and 62, respectively. Longitudinal pockets-or ports; 65 andfiil are formed in thewallof the piston 64 and they communicat successively with the inlet andoutlet; -Meansfor reciprocating and for. rotating th s n-. p o i .i'.' m ns; c ns s 9? cam follower generally; indicated at 6 8 .andconsisting specifically of an arm 10 having thepin 12 :passed therethrough :andalso .',through the inner endof the piston 64} A locking dowel typethrough the arm 10: and alsov thepin [4. is passed pin 'il Studs v boresprovided in the armlll, and have rollers. 80 and 8 2, respectively; :carried thereby. These rollers are disposed in-the cam trackilland are which are formed in the cage Ill. Aside from; various bearinginserts, as; the inpassed throughlongitudinal slots 8B and 88 I sert 9 0 for thegear l2,the essential portions ofthe. structure have been described; It is pa.- vious that the end plate 30 is fixed. tothehousing 2 5 by means of bolts 92'- or other. equivalent members. Itis also apparent that theentiremechanism, exclusive of ,;that involved. in wthe pump chamber, maybe sealed ina suitable lubricant.

. In operation, torque'is applied to-the. operating shaft [8 which is transferredthrough the gears to the cage liL- This cage isinalignment with the longitudinal axisof the cylinder 28- and is parallel to theshaft I8. Upon, rot'ationofthe; cage ill the. arm. 16 is rotated since the, sleeves Bland 96 are disposed inthe slots86 .and.-88, re-

spectively. The armllfi beingfixed to the piston.

64 causes the piston to rotate. However, since the rollers 82 and 80 are disposed the cam track 50, as the arm .10 rotates it is also reciprocated in accordance with the shape of the cam track.. This shape has been described as substantially sinusoidal when..developedona plane surface. Since the pockets 66 and 68 are disposedat 180 degrees from each other and the inlet and outlet for the pump chamberare disposed at .90 degrees with respect to eachother, one pocket isused for one complete operationwhile the second pocket follows the first one for a second fully independent operation; during-the reciprocation of the piston.

Referring to Figure 5, the piston 64 is shown in, thesubstantially fully extended position. In

h and I l8, respectively," are. disposed in the pocket 68 passes the inlet 60 so that the fluid in the pocketit may be discharged through the outlet 62. .This actual 3 discharge takes place at the bottom portion of the sine wave or, when the rollers 82 and are disposed at the innermost part of the cam track 50. The second stage shown in'Figure 5 indicates a condition just prior to' discharge of the fluid in the pocket 66.

Reference to the third stage shown in Figure 5- illustratesthat the piston 64 is returning forcing the fluid which was trapped in the pocket 68. The other stages of operation are repetitious f. of the previously described ones.

Having described the invention, what is claimedasnewisr" 1. A pump comprising a h inder with a-piston therein an operating shaft mounted for rotation in. said housing;- spaced:

pinions fixed to said; shaft, -a cage rotatively mounted in bearings in said housingand being substantially parallel-with said"v cylinder, spaced; gears secured to said cage and'enmeshed with: said pinions whereby said cage-is rotated as'a result of rotation ofsaid operating, shaft; longitudinal slots in said cage, a member flxed to said housing in concentric relationship with said follower secured to said (piston-and when said piston is rotated and 'reciproc'atedi 2. A pump comprising 'ahousing having a cyl-' inde'r,; a piston disposed insaid cylinder; an operating shaft mounted forirotation' in"said-hous'-" ing; a gear fixed to said sh'aft, a cage-disposed in said housing and having a longitudinal axis coaxial with the longitudinalaxis ofsaid cylin-* der, a gear secured to said cage and enmeshed with said first mentioned gearso'thatsaid cage is rotated in-respon'se to rotation'of "said operate. ing shaft; said cage having'at least" one longi tudinal slot therein, a member secured within" said housing and having a cam track, a cam follower secured' to said piston and passed through said slot and disposed in "said'cam'track'to im-' part reciprocatory movement to said piston while? said pockets when said pisto'nds rotated-and re-:

cipro'cated- Y REFERENGES bI E The following references are of recordin the file of'this'patent: H 1

UN TEDS MESP T NT Q Number 1 Name: 7 w EDfitB-f 664,1so Serpollet ..Dec. 18, o 2,124,800 Sykora July-26,1938; 2,291,601 Bancroft Aug.- 4, 1942 bus n h in -f vlr i WAYNE. Bl nsLEm-

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