US2010761A - Rotary pump - Google Patents

Description

Aug. 6, 1935. J. HAZLINGER 2,010,761

RbTARY PUMP Filed May 15, 1934 2 Sheets-Sheet 1 cfo/m [fez/ er J. HAZLINGER ROTARY PUMP Filed May 15, 1954 2 Sheets-Sheet 2 INVENTOR ATTORNIY Patented Aug. 6, 1935 r UNITED STATES PATENT OFFICE '2,01Q ,761' g ROTARY PUMP 'John Hazlinger; Middlesex Boro, N. J.

Application May is, 1934, Serial No. 725,784 r I I 1 Claim. (01. 103-132) This invention relates to rotary pumps wherein an eccentrically mounted rotor is revolvedwithin a cylindrical chamber to effect a pumping action.

In the operation of the form of rotary pump heretofore employed the delivered pressure of the pump had a characteristic fluctuation which in many engineering applications is highly objec:

tionable. This pressure fluctuation results from the principle of operation upon which this pump is based. a a

It is the primary object of my invention to overcome these objections by providing'a pump wherein the graphic curve of the resultant pressure delivered by the pump would be substantially a straight line. It is obvious that this improvement would effect certain economies in power consumption in thata pump of this type'will require arnore even torque.

The invention will be fully and comprehensively understood from a consideration of the following detailed des'cription when read in connection with the accompanying drawings which form part of the application,'with the understanding, however, that the improvement is capable of extended application and is not confined to the exact showing of the drawings nor to the.

precise construction described and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claim. 7

In describing the invention in detail and the particular physical embodiment illustrating the invention, reference is had to the accompanying drawings wherein like characters of reference designate corresponding parts thruout the'several views. r I

In the drawings:

Fig. 1 is a side elevational view of my device with cover removed and certain parts in section.

Fig. 2 is a central sectional view of Fig. 1.

Fig. 3 is a plan sectional view taken on the line 33 of Fig. 1.

Figs. 4, 5 and 6 are diagrammatic views similar to Fig. l but illustrating various stages in the cycle of operation.

Fig. I is a central sectional view of an alternate arrangement of my device; and

Fig. 8 is a detail view of the piston operating mechanism taken on line 8-8 of Fig. '7. V

Referring to Figs. 1 and 2, numeral 9 indicates a pump shaft upon which is formed an eccentric collar III which carries an annular piston l I, the collar II] being rotatable within the piston II. A casing l2 in conjunction with an end. plate 13 the piston I I.

between the spaces at either side of the contact 'line.' i The casing I2 and the end plate I3 have the guideway 2!. "is provided with a three-quarter circular lateral bead 25 which fits into a nular piston II and in'axial alignment to same.

'The groove 26 and bead 25 provide an operative 25 mechanical connection between annular piston I I and piston 22 and are adapted to transmit the of cylinder 26 and the atmosphere so mospheric pressure. Into one side of the guide 35 24 is formed a vertical groove 29 to provide unslot 33 is provided in the body of the guide 24 to construction the chambers on either side of the 45 illustrating the cycle of operation.

forms a cylindrical chamber I4, the interior ends of which are contacted by the circular endsof The most eccentric peripheral point of the piston II contacts with the interior cylindrical wall of the chamber I4 to effect aseal "5 at their axial centers journals I5 and I6 respectively which rotatably support the shaft 9. 'The journal I6 is provided with a closure wall I! at its outer end.

A cylinder is disposed radially from the chamber i4 and beyond the periphery of same. The interior of cylinder 28 and chamber I4 are connected by a rectangular guideway 2 I. A pis- '15 ten 22, provided with a piston ring 23 to insure the pistons sliding fit in the cylinder 20, transforms into a rectangular sectioned guide 24 at its lower end, said guide being adapted to slide in The lower end of the guide 24 20 like circular sectioned groove 26 proximal to the periphery of the anradial motion of the piston II to a reciprocatory motion of the piston 22. The cylinder 20 is pro- Vided with a removable cylinder head 21 thru =30 which is formed a breather hole 28 which provides communication between the upper portion that the upper side of piston 22 is subjected only to atrestricted communication between chamber I4 and the lower portion of cylinder 20. A vertical slidably retain an abutment 3|, the lower end of 4.0 which is arcuately formed to fit into a circular groove 32 cut axially in the periphery of the piston I I. The. springs 33 pressing against the abutment 3| hold its lower end in contact. By this abutment are isolated from each other.

These chambers are designated by numerals 35 andSfi. The chamber 35 is the inlet side of the pump to which is connected an inlet pipe 31 thru the port 38. Chamber 36 is the compression side of the pump to which is connected a delivery pipe 39 thru a port 40.

With reference now to the operation of the pump, attention is directed to Figs. 4, 5 and 6 The pump take is shaft 9 is rotated in the clockwise direction indicated by the arrow. The eccentricity of the collar iii causes the annular piston H to revolve in the chamber M. The piston l l is prevented from rotating with the eccentric collar M by its mechanical connection to the guide 24. This arrangement results in a rolling contact of the periphery of piston l 1 against the cylindrical wall of the chamber I 4. In describing the detailed operation of the pump a theoretical line 42 is used, which line is projected radially from the axial center of shaft 9 to the contact point of the periphery of piston ll hereinbefore mentioned. It is to be noted here that because of the resultant rolling action of the piston l i, this contact point moves about the periphery of the piston H resulting in an efiective seal at this point between the chambers 35 and 36. In Fig. 4 is illustrated the beginning of the cycle, line 42 being at approximately 45" from the dead center. At this stage the piston has just begun to move downwardly, as indicated by its arrow. This motion of the piston 22 continues until the line 52 is on the vertical center line or at dead center. At this point the pump has completed half its cycleand the piston 22 has been moved to its lowermost position. As the piston ll continues around to complete theiatter half of its cycle the piston being raised to its uppermost position. The revolution of the piston H from the position in Fig. i to that shown in Fig. 6 constitutes the completeintake or suction operation. The effect of the reciprocatory motion of piston 22 during innegligible because of the relative position of abutment 3i and the resultant isolation of chamber 35 from the operation of piston 22.

With reference now to the operation of the pump during its compression stroke, which it will be observed occurs simultaneously with the intakestroke, the chamber 35 has been filled with liquid during the intake stroke. Fig. 4 illustrates the beginning of the compression wherein line 42 is at approximately 45 from the vertical and piston 22 is at its uppermost position. As piston H is revolved until line 62 is on lower dead center, Fig. 5, piston v22 is being pulled downwardly. This constitutes half the compression stroke, during which time the chamber 36 is of greater volume than during the remainder of the stroke. The piston 22 moving downwardly accelerates the compression of the liquid by displacing same from cylinder 2E3. The piston l i now moves around from dead center to position in Fig. 6 to complete the compression stroke. During this are of the cycle the piston 22 is being raisedflvhich motion results in the increase of the volume of chamber 36 in that, some of the liquid, being compressed, is pushed into cylinder 29 thru the groove 29. Thus the cooperation of piston 22 with piston I I effects an acceleration of compression during the first half of the stroke by more rapidly confining the liquid in the compression chamber and further efiects a deceleration of the compression during the latter half of the stroke by gradually increasing the volume of chamber 38. By the cooperation of the revolving annular piston H with the reciprocating piston 22 it will be found that the fluctuation of the resultant delivered pressure will be at a minimum and that therefore the torsional power required to operate the pump will be substantially uniform thruout the entire cycle.

Referring now to Figs. 7 and 8, a modified arrangement of the reciprocating piston in conjunction with the rotary pump is shown. In this arrangement the rotary pump unit is constructed essentially the same as that illustrated in the first form, Figs. 1 and 2, except that the reciprocating pump unit is remote therefrom. The cylinder 50 of the reciprocating pump is supported on a bracket 5i attached to a casing 52 of the rotary pump. A port 53 formed in the base of bracket 5! provides communication between the lower portion of cylinder 5b and the compression side of the rotary pump. It is to be noted here that this port 53 has the samefunction in the operation of the entire pump as does groove 29 in the first arrangement. A piston 59 is slidable within cylinder 59 and isaffixed to a connecting rod 55:, the end of which is formed in a yoke '51. The shaft 9 upon which integrally formed a collar it, as described for the first arrangement, has also a similar eccentric collar 5:. formed on it. A connecting rod 55 is rotatably mounted on collar 54 and pivotally mounted to the yoke 5i by means the pin 58 so that a reciprocatory motion of cylinder 59 is imparted thru the connecting'rod 55 as generated by the rotation of eccentric collar 54. The detailed operation of this arrangement is identical to that described for the first and more preferred arrangement.

What is claimed as new is:

In a rotary pump, a casing having an inlet and an outlet, an annular piston eccentrically revolvable within said'oasing, a fiuid chamber between said annular piston and said casing, a cylinder the interior of which communicates with the interior of said fluid chamber, and a second piston within said cylinder adapted to be reciprocated by the movement of said annular piston, said reciprocable piston on its upward stroke assisting the upward movement of the annular piston in the last half of the latters cycle, there being a passageway between a wall of said cylinder and part of said reciprccable piston where- .by the latter may force fluid from said cylinder toward said outlet on its compression stroke.

JOHN HAZLINGER.

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