US2354980A

US2354980A - Reciprocating pump

Info

Publication number: US2354980A
Application number: US520599A
Authority: US
Inventors: Arras Damiano
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-02-01
Filing date: 1944-02-01
Publication date: 1944-08-01
Anticipated expiration: 1961-08-01

Description

A Aug. 1, 1944. D. ARRAS RECIPROCATING PUMP Filed Feb. l, 1944 5 Sl'leetS--She'riI er. m., ,w H

Aug. l, D, ARRAS RECIPROCATING PUMP Filed Feb. l, 1944 3 Sheets-Sheet 2 Aug. 1, 1944. D. ARRAS 2,354,980 n REGIPROCATING PUMP Filed Feb. l, 1944 3 Sheets-Sheet 5 lll...

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Patented Aug. l, 1944 UNITED STATES PATENT QFFICE .nrzcrPRocATlNG PUMP Damiano Arras, Chester, Conn. Application February 1, 1944, serial No. 520,599

(ci. a-4) 5 Claims.

The present invention relates to improvements in pumps, and more particularly to improvements in reciprocating pumps suitable for pumping a variety of fluids, either liquid or gaseous. The present application constitutes a continuation-in-part of my now abandoned but co-pending application Ser. No. 493,271, filed July 2, 1943.

One of the objects of the present invention is to provide a superior reciprocating pump having simple, reliable and effective means for guarding against the intermixture of the uid being pumped and the lubricating medium.

Another object of the present invention is to provide a reciprocating pump with a vsuperior construction and arrangement of parts whereby the adequate lubrication of the pistons is assured under all operating conditions.

Another object of theV present invention is to provide a superior reciprocating pump designed and adapted to simultaneously pump a plurality of different uids without appreciably intermixing the same.

Stm another object of the present invention is to provide a superior double-acting reciprocating pump wherein the lubricating medium may be utilized as a seal to guard against the escape of the fluid being pumped past the relatively-reciprocating surfaces.

With the above and other objects in view, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a view in side elevation of one form of double-acting reciprocating pump constructed in accordance with-the present invention;

Fig. 2 is a horizontal sectional view taken onthe line 2 2 of Fig. l;

Fig. 3 is a perspective view of one of the headmembers; d

Fig. 4 is a transverse sectional view taken on the line 4-4 of Fig. 1;

Fig. 5 is a perspective view of the double-ended reciprocating plunger-unit; and 1 Fig. 6 is a view in vertical central-longitudinal section of a modified form of reciprocating pump embodying the present invention.

The structure of Figs. 1 to 5 inclusive The particular double-acting reciprocating pump illustrated in the figures now under discussion, includes in the main, an outer pump-unit or casing-unit generally designated by the reference character I5 and a double-ended reciprocating inner pump-unit or plunger-unit, generally designated by the reference character I6.

The casing-unit I5 above referred to, includes to the outer end of the integral neck I8 is a head-member 20, while similarly secured to the outer end of theremovable neck-memberu I9 is a corresponding head-member 2I.

The head-members 20 and 2| above referred to are arranged in axial alignment though in opposition, and each thereof is provided at its outer end with a flange 22. The flange 22 of the headmember 20 is seated against the adjacent outer face of the-integral neck I8 while the similar flange of the head-member 2| is seated against the adjacent outer face of the removable neckmember I9. Inwardly of its flange 22, each of the said head-members 20 and 2l is formed with an integral collar 23 and with an integral vcupshaped piston 24 which latter, for purposes of convenience of description, may be referred to asY an inner piston. The integral collar 23 of a given head-member 20 or 2| serves to concentrically space its integral inner piston 24 from the interior surfaces of the neck I8 of the main casing-member I1 or of the neck-member I9, as the case may be. The spacing just referred to serves to provide two ring-like outer piston-chambers 25-25 respectively surrounding thel inner pistons 24-24, as is especially Well shown in Fig. 2.

The two ring-like outer piston-chambers 25-25 respectively located at the opposite ends of the pump-structure are, in the instance shown, interconnected by means of piping 26-26. Into an intermediate portion of the said piping is connected a reservoir or container 21. Interposed between the interior of the container 2'I and the piping 26 is a spring-pressed check-valve 28 serving to permit the down-flow of uid from the said container but preventing the movement of fluid in the reverse direction.

'Ihe inner pistons 24- 24 respectively extend with a sliding t, into one of two piston-chambers 29--29 which may be aptly referred to as inner piston-chambers. The said pistonchambers 29-29 are respectively formed in the opposite ends of the plunger-unit I6 before referred to; Each of the said inner piston-chambers is formed within one of two ring-like pistons 30--30 which, for convenience of description, may be aptly referred to as outer pistons. The said outer pistons 30-30 project in opposite direction respectively from the plunger-unit I6 and have their exteriors and interiors proportioned to slidingly t the adjacent one of the outer ring-like piston-chambers 25-25, as is especially well shown in Fig. 2.

Threaded into the end-wall at the inner end of a given one of the inner pistons 24 is the above referred to.

Each of the corresponding valve-housings 22--32 above referred to, has an inlet-pipe 3l connected to one of its ends and an outlet-pipe 34 connected to its opposite end. Mounted within the given valve-housing 32 adjacent the inlet-pipe 33 thereof, is an inwardly-opening spring-pressed inlet check-valve 35 constructed and arranged to admit fluid into the interior of the valve-housing 32 for movement into the inner piston-chamber 29, but serving to prevent the flow of fluid in the reverse direction. Also mounted in the interior of a given valve-housing 32 adjacent the outletpipe 34 thereof, is an outwardly-opening springpressed outlet check-valve 36 constructed and airanged to permit the egress of fluid from the interior of the said valve-housing, but serving to prevent the re-entry of such fluid thereinto.

like outer pistons 30-30 are each provided in their outer peripheries with two (more or less) duplex piston-rings 31-31. Similarly, the inner ends of the respective inner pistons 24-24 are each provided with two (more or less) duplex piston-rings "-38.

The ring-like outer pistons 30-30 respectively located at the opposite ends of the plunger-unit I6 are integrally connected by a relatively-slender tie-bar 39 resulting in the formation of an annular groove 40 in the central portion of the said plunger-unit. Closely fitting between the respective opposite side-walls of the groove 40 just referred to, is a ball-bearing driving-eccentric 4I mounted upon an eccentric pin or stud 42. 'Ihe said eccentric pin 42 extends inwardly from a disk-like drive-head 43 formed upon the inner end of a drive-shaft 44 extending radially outwardly into a position accessible for the connection of a motor or the like to its outer end.

The drive-shaft 44 above referred to and the parts carried thereby, are mounted for rotation in .a two-part bearing-housing 45 having its flanged inner end bolted or otherwise secured in a duid-tight manner to one side of the main casingmember I1. as is shown in Figs. 1 and 2.

Interposed betweenv the inner portion of the drive-shaft 44 and the adjacent portions of the bearing-housing 45, is a. ball-bearing unit 46. Rigidly mounted upon the drive-shaft 44, in a position outwardly with respect to the ball-bearing unit 46, is a bearing-sleeve 41.

Formed in the inner face of the bearing-sleeve 41 is an `annular groove 46 complementing a similar annular groove 49 formed in the adjacent portion of the bearing-housing 45. Jointly tting into the grooves 48 and 49 just referred to, is a packing-ring 50 formed of leather, felt or other suitable material and serving to guard against the egress of lubricant from within the casingunit I5.

Formed in the outer face of the bearing-sleeve 41 on the drive-shaft 44 is an annular outwardlyopening groove i complementing a similar but inwardly-facing groove 52 formed in the adjacent outer wall of the bearing-housing 45. J ointly interfltting into the grooves 5l and 52 just referred to is a packing-ring 53 serving to guard against 75 the egress 'of llubricant outwardly through the outer portion of the said bearing-housing 45.

From the foregoing it will be seen that as the drive-shaft 44 is turned, the plunger-unit i6 will be reciprocated. This reciprocation of the plunger-unit I6 will cause fluid to be alternately drawn into and expelled from each of the inner piston-chambers 29. As the plunger-unit I6 reciprocates, lubricating oil or the like in one ringlike outer piston-chamber 25, will be transferred back and forth to the other outer piston-chamber 25 through the piping 26. Should the oil in the piping 26 and the piston-chambers 25-25 become lessened for any reason, the volume will be made up automatically by oil flowing down from the container 21 past the check-valve 29. In this manner, the various piston-surfaces will be assured of adequate lubrication, and the lubricating oil or the like will serve as a seal to prevent escape of the fluid being .pumped from the inner pistonchambers 29-29.

Should conditions make it advisable, the interconnecting tubing 26 and associated parts may be omitted, and a relatively-small amount of lubricant placed in each of the outer ring-like pistonchambers 25-25. Under these latter conditions, the movement of the ring-like outer piston-chambers Sli- 30 will serve to distribute such lubricant and minimize wear.

If desired, and as will be obvious to those skilled in the art, one or more of the ring-like outer piston-chambers 25-25 may be utilized for pumping fluid to an extraneous receptacle, independently of the fluid being pumped from the inner piston-chambers 29-29.

The structure of Fig. 6

In Fig. 6 is illustrated a single-ended pumpstructure, the main parts of which correspond in substance to the parts of the structure previously described, and where pertinent the parts shown in Fig. 6 bear like reference characters. As will be noted by reference to Fig. 6, the plunger-unit lia has only one ring-like piston 3l and has aguide-stem 54 at its opposite end. The right end of the main casing-member I1 is closed by an end-plate 55, rather than having a neckmember such as i9 attached thereto. The endplate 55 is -formed with an integral bearingsleeve 56 in which the guide-stem 54 of the plunger-unit iGa slides.

The ring-likeouter piston-chamber 25 may be connected in any manner desired to provide for the pumping of a fluid independently of the fluid pumped from the inner piston-chamber 29. In the instance shown, the outer piston-chamber 25 is connected by means of a pipe 51 to a container 58, so as to provide for the interchange of lubricant between the said container and the said outer piston-chamber 25. As will be obvious to those skilled in the art, should it be desired to utilize the outer piston-chamber 25 for the pressure-pumping of a fluid to any desired point, a valve-casing such as 32, together with its complemental check-valves, may be attached to the pipe 51.

The invention may be carried out in other speciflc ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to he considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are in. tended to be embraced therein.

I claim:

1. A reciprocating pump, including in combination: a first pump-unit and a complemental second pump-unit one of which is movable toward and away from the other to effect the pumping of fluid; the said first pump-unit being formed with an inner piston and with a ring-like outer piston-chamber surrounding the said inner piston; the said second pump-unit being formed with a ring-like outer piston and with an inner piston-chamber located within the said ring-like outer piston; the inner piston or the said rst pump-unit fitting into the inner piston-chamber within the outer piston of the said second pump-unit and the ring-like outer piston of the said second pump-unit fitting into the ring-like outer piston-chamber of the said first pump-unit; means providing for the inow and outflow of fluid with respect to the said inner piston-chamber; a fluid-receptacle; means connecting the said duid-receptacle with the aforesaid ring-like outer piston-chamber and constructed and arranged to provide for the transfer in both directions of lubricant between the said outer pistonchamber and the said fluid-receptacle as one of the said pump-umts reciprocates with respect to the other; and means for reciprocating one of the said pump-units with respect to the other.

2. A reciprocating pump, including in combination: a first pump-unit and a complemental second pump-unit one of which is movable tward and away from the other to eii'ect the pumping of fluid; the said first pump-unit being formed with an inner piston and with a ring-like outer piston-chamber surrounding the said inner piston; the said second pump-unit being formed with a ring-like outer piston and with an inner piston-chamber located within the said ring-like outer piston; the inner piston of the said first pump-unit fitting into the inner piston-chamber Within the outer piston of the said second pumpunit and the ring-like outer piston of the said second pump-unit iitting into the ring-like outer piston-chamber oi.'v the said first pump-unit; means extending longitudinally through the inner piston of the said first pump-unit and pro- Y viding for the inflow and outflow of fluid with respect to the said inner piston-chamber; a fluidreceptacle; means interconnecting the said fluidreceptacle and the said outer piston-chamber and constructed and arranged to provide for thel interchanse of uid in both directions between the said fluid receptacle and the said outervpistonchamber; and means for reciprocating the said second pump-unit with respect to the first ilrst pump-unit.

3. A reciprocating pump, including in combination: a pump-casing and a complemental pump-plunger one of which is reciprocabie with respect to the other; the said pump-casing being provided at each of its respective opposite ends with one of two inner pistons each projecting toward the other; the said pump-casing also being formed with two ring-like outer pistonchambers each of which opens toward the other and each of which vsurrounds one of the aforesaid inner pistons; the said pump-plunger being formed at its respective opposite ends with one of two ring-like outer pistons and 'with one of two inner piston-chambers respectively located within one oi' the said ring-like outer. pistons; the inner pistons oi' the said pump-casing respectively fitting into one of the inner pistonchambers within the outer pistons of the said pump-plunger and the ring-like outer pistons of the said pump-plunger respectively iitting into one of the ring-like outer piston-chambers of the said pump-casing; fluid-conducting means interconnecting one of the piston-chambers adjacent one end of the structure with a piston-chamber at the other end of the pump-structure to provide for the interchange of iluid therebetween; and means for causing reciprocatory movement between the said pump-casing and the said pumpcasing and the said pump-plunger.

4. A reciprocating pump, including in combination: a pump-casing and a complementa] pump-plunger one of which is reciprocable with respect to the other; the said pump-casing being provided at each of its respective opposite ends with one of two inner pistons each projecting toward the other; the said pump-casing also being formed with two ring-like outer pistonchambers each of which opens toward the other and each of which surrounds one of the aforesaid inner pistons; the said pump-plunger being formed at its respective opposite ends with one of two ring-like outer pistons and with one of two inner piston-chambers respectively located within one of the said ring-like outer pistons; the inner pistons of the said pump-casing respectively fitting into one of the inner pistonchambers within the outer pistons of the said pump-plunger and the ring-like outer pistons of the said pump-plunger respectively fitting into one of the ring-like outer piston-chambers of the said pump-casing; means providing for the inflow and outflow of fluid with respect to the two said inner piston-chambers; and Huid-conducting means interconnecting the two said outer piston-chambers with each other and providing for the interchange of lubricant therebetween; and means for causing reciprocatory movement between the said pump-casing and the said pump-plunger.

5. -A reciprocating pump, including in combination: a pump-casing and a complementa] pump-plunger one of which is reciprocabie with respect to the other; the said pump-casing being provided at each of its respective opposite-ends with one of two inner pistons each projecting toward the other; the said pump-casing also being formed with two ring-like outer pistonchambers each of which opens toward the other and each of which surrounds one oi' the aforesaid inner pistons; the said pump-plunger being formed at its respective opposite ends with one of two ring-like necting one of the piston-chambers adjacent one end of the structure with a piston-chamber at the other end of the pump-structure to provide for the interchange of fluid therebetween; and means for reciprocating the said pump-plunger in the interior of the said pump-casing.

DAMIANO ARRAS.

outer pistons andwith one of two inner piston-chambers respectively located 1 pistons of the said Dumm'