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US3267862A - Apparatus for pumping and separating liquid and gaseous fluids - Google Patents

Apparatus for pumping and separating liquid and gaseous fluids Download PDF

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Publication number
US3267862A
US3267862A US352067A US35206764A US3267862A US 3267862 A US3267862 A US 3267862A US 352067 A US352067 A US 352067A US 35206764 A US35206764 A US 35206764A US 3267862 A US3267862 A US 3267862A
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compartments
outlet port
fluid
port
inlet
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US352067A
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Bruce H Mosbacher
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Roper Technologies Inc
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Roper Industries Inc
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/007Venting; Gas and vapour separation during pumping
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00Fluid
    • F04C2210/10Fluid working
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00Fluid
    • F04C2210/24Fluid mixed, e.g. two-phase fluid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00Application
    • F04C2220/20Pumps with means for separating and evacuating the gaseous phase

Definitions

  • This discharge .port is shaped and arranged to communicate with the 4 pockets at the discharge side of the pump in a zone adjacent the roots of the teeth in the inner rotor 12 and spaced radially inward of the roots of the teeth in the outer rotor 11 so that the gas and vapor which has collected adjacent the roots of the teeth in the inner rotor 12 will be forced outwardly through the discharge port 38 as the compartments progressively decrease in volume during rotation of the inner and outer rotors.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Description

1 w t n w 7 h 6 m 3 h s G 2 N I T A R A P mw Hm A AG 3, 1966 B. H. MOSB APPARATUS FOR PUMPIN LIQUID AND GASEOUS FLUIDS Flled March 16. 1964 71MM Y @202 3, 1966 B. H. MOSBACHER 3,2 7,
APPARATUS FOR PUMPING AND SEPARATING LIQUID AND GASEOUS FLUIDS Flled March 16. 1964 2 Sheets-Sheet 2 75y 5' W WV? 3 267 862 APPARATUS FOR PU MPI NG AND SEPARATING LIQUID AND GASEOUS FLUIDS Bruce H. Mosbacher, Rockford, IlL, assignor to Roper Industries, Inc, Rockford, 111., a corporation of Illinois Filed Mar. 16, 1964, Ser. No. 352,067 14 Claims. ((11. 103-6) This application a continuation-in-part of my copending application Serial No. 862,693, filed August 10, 1959, now Patent No. 3,137,234.
This invention relates to a pumping apparatus, and particularly to a positive displacement type pumping ap paratus for separating fluids having different densities.
An important object of this invention is to provide an apparatus for separating fluids having different densities and-which will draw the fluids into the apparatus and deliver the same under pressure to eliminate the necessity of auxiliary pumping apparatus for feeding and Withdrawing fluid from the separator.
A more particular object of this invention is to provide a rotary positive displacement pumping apparatus having a plurality of compartments which rotate to centrifugally separate the fluid therein and which compartments progressively increase in volume in one sector of the pump to draw fluid into the chambers and progressively decrease in volume in another sector to discharge the fluid under pressure, and in which the delivery ports are arranged to receive the centrifugal-1y separated fluids to deliver the same in different streams.
Another object of this invention is to provide a pumping apparatus which will separate gas and vapor from a liquid and discharge the same in separated streams to return the vapor to the supply reservoir and deliver the substantially vapor-free liquid to the point of use.
Still another object of this invention is to provide a positive displacement type pump apparatus having internal and external meshing gears and a plurality of outlets for discharging fluid in separate streams, and which pump apparatus has an improved arrangement for relieving trapped fluid as the tooth spaces move out of communication with one outlet port and into communication with another outlet port.
An important feature of the present invention resides in the provision of a rotary positive displacement type pumping apparatus having a plurality of segregated pumping compartments which expand during one portion of each revolution to draw fluid into the compartments and which contract during a different portion of each revolution and in which .air and gas is vented from the inner periphery of the compartments before the liquid is discharged from the compartments.
These, together with various ancillary objects and advantages of this invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description when taken in connection with the accompanying drawings herein:
FIGURE 1 is a diagrammatic view of an apparatus for separating fluids having different densities, which apparatus employs an internal gear pump and with the gear pump broken away and shown in section along the line 1-1 of FIG. 2 to illustrate details of construction;
FIG. 2 is a sectional view taken on the plane 2--2 of FIG. 1;
FIG. 3 is a sectional view through the pump taken along the plane 3-3 of FIG. 1;
FIG. 4 is a diagrammatic view of a modified form of apparatus for separating fluids having different densities, which apparatus employs a vane type pump, with the pump broken away and shown in section along the line 4-4 of FIG. 5;
FIG. 5 is a sectional view taken on the plane 5-5 of FIG. 4; and
United States Patent 0 "ice 3,267,862 Patented August 23, 1966 FIG. 6 is a sectional view taken on the plane 66 of FIG. 4;
In general, the apparatus for separating fluids having different densities includes a rotary positive displacement pump device, such as a gerotor type pump or a vane type pump. Such rotary pumps define a plurality of rotating compartments which progressively increase in volume to draw fluid into the compartments and then progressively decrease in Volume to discharge the fluid under pressure from the compartments. It has been found that the rotation of the fluid in the compartments of such pumps will produce a centrifugal separation of the fluids in the compartments with the heavier fluids lying adjacent the outer periphery of the compartments and the lighter fluids disposed adjacent the inner periphery of the compartments. -In accordance with the present invention, separate delivery ports are provided and arranged to receive the centrifu gally separated fluids and deliver the same in separate streams.
The fluid separating apparatus is generally adapted for use in separating fluids having different densities and may be used to separate different liquids such as oil and water which have different densities, and also for separating liquids from gases. While the device is herein illustrated as used to separate two different fluids, the apparatus can be modified by the provision of additional ports, suitably arranged, to separate more than two fluids.
Reference is now made more specifically ot FIGS. 1-3 of the drawings wherein there is illustrated an internal gear pump including a housing 10 and having outer and inner gerotors 111 and 12 therein defining a pumping chamber 18 therebetween. The housing 10 is herein illustrated as being formed in a plurality of separate sections including an end wall 13, a port plate 14, an annular side wall 15 and an end wall 16. The aforementioned sections are assembled one on topof the other and retained together by fasteners 17 and, when assembled, define the pump chamber 18 therein between the end Wall 1 6 and the port plate 14.
The outer rotor 11 is in the form of a ring gear and is rotatably received in the chamber 18 for rotation about the axis thereof. The inner rotor 12 is disposed within the outer rotor and is mounted for rotation about an axis eccentric to the axis of the outer rotor. As herein illustrated, the inner rotor 12 is mounted on a shaft 21 and is non-rotatably connected thereto as by a key 22. Seals 23 and 24 are provided on the end plates 13 and 16 to prevent leakage of fluid thereby along the shaft 21. As is conventional, the shaft 21 is connected to a suitable source of power to rotate the inner gear or rotor 12.
The outer rotor 11 has inwardly extending lobes or teeth 27 which mesh with outwardly extending lobes or teeth 28 on the inner rotor 12. In the igerotor type pump shown in FIGURE 1, the lobes 27 and 28 areshaped so that each of the outwardly extending lobes 28 on the inner rotor is disposed, in all operative positions thereof, in close running fit with one Of the inwardly extending lobes or teeth 27 on the outer rotor to form a running seal therebetween and separate the pump chamber into a plurality of compartments which rotate with the inner rotor. As the inner rotor 12 .isrotated by the shaft 21, the compartments between the inner and outer rotors in one sector of the pump chamber 18 expand and increase in volume and the compartments between the inner and outer rotors at the other sector of the pump chamber 18 decrease in volume. When the inner rotor is rotated in a counterclockwise direction as indicated by the arrow in FIGURE 1, the compartments at the right hand side of a plane through the axes of the inner and outer rotors are expanding and the compartments at the left hand side of that plane are decreasing in volume. Liquid is sup- 'inner and outer rotors.
referred to as a minimum distance. gear type pump ilustrated in FIGS. 13, the outer edge inlet port is dimensioned to communicate with the compartments at the first sector of the chamber, that is, at the inlet side of the pump, to supply fluid thereto, but terminates short of the plane through the axes of the inner and outer rotors. The fluid entering the pumping chamber through the inlet port 34 is rotated with the When the liquid contains occluded gas or vapor, the relatively light gas will be centrifugal ly separated from the denser liquid, the denser liquid flowing outwardly into the tooth spaces in the outer rotor 11 and the relatively light vapor and gas being vforced inwardly into the intertooth spaces of the inner rotor. One outlet port designated 38 is provided for discharging the gas and vapor and one or more other outlet ports, herein designated 39 and 40 are provided for discharging the substantially vapor tree liquid in streams separated from the stream from the gas outlet port 38.
In accordance with the present invention, the first outlet port 38 is disposed at that sector of the chamber at which the compartments diminish in volume, that is, at the side of the plane through the axes of the inner and 'outer rotors opposite the inlet port 34. The discharge .7 port 38 has one end 38a angularly spaced in the direction of rotation of the gears from the inlet port a distance approximately equal to the spacing between the seal points of adjacent teeth on the inner rotor with the teeth on the outer rotor to prevent direct communication between compartments when the compartments move out of commun-ication with the first discharge port. This discharge .port is shaped and arranged to communicate with the 4 pockets at the discharge side of the pump in a zone adjacent the roots of the teeth in the inner rotor 12 and spaced radially inward of the roots of the teeth in the outer rotor 11 so that the gas and vapor which has collected adjacent the roots of the teeth in the inner rotor 12 will be forced outwardly through the discharge port 38 as the compartments progressively decrease in volume during rotation of the inner and outer rotors. The radially .outer edge 380 of the port 38 at the end 38b thereof is arranged to approximately merge with the inner periphery of the compartments, that is with the roots of the teeth on the inner gear 12, and the radially outer edge 38c at all other points therealong is spaced from the outer periphery of the compartments a distance such that the -volume of liquid in the compartments between the radially outer edge 38c and the outer periphery of the compart- -ments is no less the volume of liquid that remains in the compartments when they move out of communication with the port 38. This distance is hereinafter sometimes Thus, in the internal 380 at the end 38b of the port is spaced radially inwardly from the roots of the teeth in the outer rotor a distance approximately equal to the radial spacing between the roots of the teeth in the outer rotor and the roots of the teeth in the inner rotor when they are adjacent the end 38b .Of the port.
In practice, the outer edge 380 at the end 38b of the port should be just slightly outward from the roots of the teeth on the inner rotor to receive substantially only the gaseous fluid at the inner periphery of the comport. In the embodiment shown in FIG. 1, the outer edge 380 at other points therealong is spaced somewhat farther from the roots of the inner rotor, but is yet spaced inwardly from the roots of the teeth in the outer rotor a distance at least equal to the aforedescribed minimum distance which should be maintained between the outer edge 38c and the roots of the teeth on :the outer rotor. However, the outer edge 380, at points spaced from the end 38b, can, if desired, be located somewhat closer to the roots of the teeth in the inner gear than that specifically shown in the drawings, if care is taken to provide adequate flow area to prevent excessive restriction of flow from the compartments through the first outlet port. For example, the outer edge 380 could be made to extend generally concentric With the axis of the inner rotor, at a radius slightly larger than the radius to the roots of the teeth on the inner rotor. The location of the inner edge 38d of the rotor is not critical, so long as it is located radically inwardly of the roots of the teeth on the inner rotor and spaced from the shaft suflicient to permit sealing of the end faces of the inner gear.
The relatively dense liquid is centrifugally forced outwardly and remains in the intertooth spaces in the outer rotor 11. This liquid is discharged separate from the air, may, for example, be discharged through plural ports des ignated 39 and 40. The discharge port 39 is angularly spaced in the direction of rotation of the gears from the discharge port 38 and, similarly, the port 40 is angularly spaced from the port 39. The angular spacing between the discharge ports 38, 39 and 40 must be accurately controlled in order to maintain the normally high efliciency of a pump of this type without causing high losses due to trapping of liquid in the space between ports 38, 39 and 40. More particularly, the discharge ports 38, 39 and 40 must be spaced apart a distance suflicient to substantially prevent each pumping compartment from communicating simultaneously with two adjacent ports. As shown in FIG. 1, the second discharge port 39 has one end 39a arranged to extend crosswise of the compartments as they move therepast and which end is angularly spaced from the end 38b of the first outlet port a distance such the seal point designated S between the inner and outer gear teeth at the lead side of the pump compartment just moves across the edge 39a at about the time that pump compartment moves out of communication with the first outlet port. As the seal point S moves across the end 39a, the compartments begin to discharge into the second outlet port. However, the flow area to the second port is small until the seal point has moved substantially past the end 39a. In order to reduce trapping, trapping relief groove portions designated 39b and 390 are provided at the end 3901 and extend toward the first outlet port. The grooves 39b and 390 are radially spaced apart and are arranged to respectively underlie the teeth on the outer and inner rotors and to communicate with the compartments only adjacent the roots of the teeth on the outer and inner rotors respectively. The grooves 39b and 390 extend unequal lengths from the end 39a and are so arranged that they respectively communicate with a compartment at the roots of the teeth on v the outer and inner rotors at about the time the seal point S at the lead side of that compartment moves across the end 39a.
The other end 390! of the port 39 is angularly spaced from the end 40a of the port 40 a distance approximately equal to the spacing of the seal points of adjacent teeth on the inner rotor with the teeth on the outer rotor. The port 39 is preferably provided with trapping relief groove portions 39e and 39] on the trailing end thereof which extend toward the third port 40 and are radially spaced end thereof which extend toward the port 39 and are also radially spaced apart to communicate with the compartments only adjacent the roots of the teeth in the outer and inner rotors. As will be seen from FIG. 1, the grooves 40b and 40c are proportioned so as to communicate with each compartment adjacent the roots of the teeth, at about the time the seal point between the gear teeth moves across the end 4011 of the third port. The other end 4tld of the port 40 is angularly spaced from the adjacent end 34a of the inlet port.
The percentage of gas in the liquid supplied at the inlet of the pump will vary in different systems and with different liquids. The relative lengths of the discharge ports are selected so that the portion of the pump displacement discharged through the port 38 exceeds .the percentage of gas in the inlet liquid. In the embodiment illustrated, the length of port 38 is arranged so that approximately fifty percent of the displacement of the pump is discharged therethrough, the balance being discharged through the other ports 39 and 40.
The port 38 communicates through a passage 41 in the end plate 13 and through a conduit 42 with the reservoir 31 to return the vapor and gas and whatever liquid is discharged through the port 38 back to the reservoir. As is conventional, the reservoir 31 is vented, as by means of a vent 44 to permit exhausting of the vapor returned to the reservoir. The other discharge ports 39 and 40 are connected through passages 45 and 46 in the end plate 13 and through conduit 47 and 48 to liquid distribution means (not shown) to deliver substantially vapor-free liquid thereto under pressure.
Somewhat improved separation of the liquid and gas can be achieved by shaping the inlet port so that at least the last portion of the fluid drawn into the compartments at the inlet sector of the pump is introduced adjacent the inner periphery of the compartments. For this purpose, the outer edge 34]) of the inlet port 34 is located so that it is spaced radially inwardly from the roots of the teeth in the outer rotor, at the end 34c adjacent the first discharge port 38.
From the foregoing it is thought that the operation of the device will be readily understood. Briefly, the liquid containing gas and occluded air enters the internal gear pump through the inlet port 34 and is centrifugally separated due to rotation of the liquid with the inner and outer rotors 12 and 11 respectively. The relatively light gas is forced inwardly by the. denser liquid and is discharged through the first discharge port 38 which is so positioned as to effect discharging of the vapor while minimizing the discharge of the vapor-free liquid. The substantially vapor-free liquid is then carried in the pockets between the rotors to the second discharge ports 39 and 4t) wherein it is discharged under pressureto the liquid lines 46 and 48. As is apparent, the single internal gear pump is arranged to operate both as a liquidvapor separator and also as a boost pump to elevate the pressure on the liquid delivered to the lines 46 and 48.
A modified form of fluid separating apparatus employing a rotary vane type Ipump is illustrated in FIGS. 46. In general, the pump housing includes a main body 51 having a concavity 52in the upper side thereof and a bore 53 for receiving a lower shaft bearing 54. An upper end bell 55 is secured to the body 51 as by fasteners56 and is sealed to the body by an O-ring 57. The end bell 55 has a bore 58 therein which supports an upper bearing 59. A shaft 61 is rotatably supported in the upper and lower bearings 59 and 54 and is driven by a suitable apparatus diagrammatically indicated at 60 in FIG. 5. A shaft seal (not shown) is provided on the upper end bell to seal the interface between the shaft and the housing. A lower plate 62 overliesthe bottom of the body 51 and the bore 53 and is sealed thereto as by O-rings 63.
An eccentric ring 65 is disposed in the concavity 52 in the pump body 51 and is held against rotation by a pin 66 which extends into the end bell 55. A rotor 68 is non-rotatably connected to the shaft 61 by a key 69.
'As will be noted from FIG. 4, the outer periphery of the rotor 68 is eccentrically disposed with respect to the inner periphery of the eccentric ring 65. A plurality of vanes 71 are slidably disposed in slots .72 on the rotor and extend into a running seal with the inner wall of the eccentric ring 65, to segregate the chamber into a plurality of compartments which rotate with the rotor and progressively increase in volume in one sector of the chamber and progressively decrease in volume in another sector of the chamber. When the rotor 68 is turned relative to the housing in the direction indicated by the arrow in FIG. 4, the compartments in that sector of the chamber located at the left half of the pump will progressively increase in volume and those compartments located at the right hand side of the pump will progressively decrease in volume. In the embodiment shown, the vanes 71 are centrifugally actuated outwardly into a close running fit with the eccentric ring, it being understood that other conventional means such as springs may be provided for this purpose.
Fluid is supplied to the compartments in that sector of the chamber at which the compartments are progressively increasing in volume through an arcuate inlet port 75. The inlet port 75 terminates short of the plane through the axes of the rotor 68 and the eccentric ring .65 to supply fluid to the compartments as they progressively increase in volume. Fuid is supplied to the port 75 through a passage 76 in the pump body 51 and a con-. duit 77 from a reservoir 78. The reservoir contains a fiuid 79 having components such as liquid and gas which have relatively different densities. The combined fluid is supplied to the compartments and is rotated with the rotor so that the components of the fluid are cen'trifugally separated. The denser component of the fluid moves to a zone adjacentthe outer periphery of the compartments and the lighter component moves to a zone adjacent the inner periphery of the compartments. Separate outlet ports 81 and 82 are provided in that sector of the chamber in which the compartments are progressively decreasing in volume to separately discharge the heavy and light components :of the fluid.
When the fluid being separated contains a gaseous component, it is advantageous to dischargethe gaseous component first due to the tendency of the gaseous component to expand. For this purpose, the first discharge or delivery port 81 is angularly spaced in the direction of rotation of the rotor from the inlet port 75 and has the inner edge 81a thereof disposed adjacent the periphery of the rotor 68 and the outer edgeSlb thereof spaced radially inwardly from the eccentric ring 65. As will be seen from FIG. 4, the-outer edge 81b at the end 810 of the port, approximately merges with the outer periphery of the inner rotor and is spaced inwardly from the outer wall of the compartments. The outer edge 8112, at all other points therealong, is spaced inwardly from the outer wall of the compartments a minimum distance at least equal to the spacing at the .end 810 so that the volume of liquid in the compartments between the outer edge 81c and the outer walls of the compartments is at least equal to the volume of liquid that remains in the compartments as they move past the end 81c and out of communication with the port 81. Preferably, the outer edge 81b, at points spaced from the end 810, is spaced inwardly from the. outer peripheral walls of the compartments a distance somewhat greater than this minimal distance so as to lie closely adjacent the outerperiphery of the inner rotor, as shown in FIG. 4. The relatively lighter component of the fluid, disposed adjacent the inner periphery of the compartments, is forced outwardly through the port 81 as the compartments progressively decrease in volume. Fluid from the port 81 passes through a passage 82 in the pump body 51 to a conduit 83. In the embodiment shown in FIG. 4, the fluid separating apparatus is arranged to separate air and vapor from liquid to discharge substandelivery port.
tially vapor-free liquid, and for this purpose the conduit :83 is arranged to communicate with the reservoir 78 to return the air and vapor and any liquid that is discharged. through the port 81, back to the reservoir. A vent 84 is provided in the reservoir to vent the excess air and vapor therefrom.
The second dis-charge port '82 also communicates with the compartments in that sector of the chamber in which the compartments are decreasing in volume, and is angularly spaced in the direction of rotation of the rotor 68 a distance at least equal to the angular spacing between adjacent vanes 71 On the rotor to prevent communication of the ports 81 and 82 through the spaces between vanes. The relatively denser fluid which remains in the compartments after the lighter fluid is discharged therefrom through port 81, is dis-charged under pressure through second discharge port 82 to a passage 85 in the pump body 51 which is connected to a delivery conduit 86.
From the foregoing it is deemed apparent that the rotary pumping apparauts will draw the fluid into the rtating pump compartments; centrifugally separate the lighter and heavier components of the fluid, and discharge the components in different streams and under pres-sure. Thus, it is unnecessary to provide additional apparatus for feeding fluid or for withdrawing fluid from the separating apparatus.
The relative sizes of the discharge ports are related so that the change in volume in the compartments as The liquid which is removed with the air is returned to the reservoir.
While the apparatus is specifically described as used to separate liquid from gases, it is apparent that it is :also adapted to separate two immiscible liquids having diiferent densities, such as oil and water.
With the arrangements shown in FIGS. 1 and 4, the relatively lighter oil would be discharged through the first delivery port and the heavier water discharged through the second Moreover, a third delivery port may be provided adjacent the outer periphery of the chamber,
to provide an airaoilwater separator.
of the fluids, said apparatus including means for effecting relative movement of the inner and outer walls away from each other to progressively expand the compartments as they move past an inlet zone and for elfecting relative movement of said inner and outer walls toward each other during a different portion of each revolution to progressively contract the compartments as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone cfior supplying fluid thereto contain-ing liquid and gaseous fluids of relatively different densities whereby expansion of the compart- 'ments draws the fluids to be separated into the compartments, said apparatus including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone, the radially outer edge of said first outlet port being spaced radially inwardly at all points therealon-g from the outer walls of said compartments, said radially outer edge at said other end of said first outlet port being located to approximately merge with the innermost periphery of said compartments as they move past said other end of the first outlet port whereby the initial contraction of the compartments discharges fluid containing the centrifugally separated gaseous fluid from the first outlet port, and a second outlet port means spaced from the first outlet port and communicating with said compartments as they move past a second sector of said discharge zone whereby subsequent contraction of said compartments discharges the liquid fluid from the second outlet port means.
2. A positive displacement pump and separating apparatus comprising, means defining a plurality of expansible and contractible pumping compartments arranged in an annular bank and segregated from each other, said compartments having inner and outer walls, means for rotating said compartments about an axis paralleling the axis of said annular bank to centrifugally separate the fluids in the compartments into radially inner and outer layers according to the relative density of the fluids, said apparatus including means for effecting relative movement of the inner and outer walls away from each other to progressively expand the compartments as they move past an inlet zone and for eflecting relative movement of said inner and outer walls toward each other during a different portion of each revolution to progressively contract the compartments as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively diiferent densities whereby expansion of the compartments draws the fluids to be separated into the compartments, said apparatus including a first outlet port having one end angularly spaced in the direction of retation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby a preselected volume of fluid remains in the compartments when they move out of communication with the first outlet port, the radially outer edge of said first outlet port at said other end thereof being located to approximately merge with the innermost part of the compartments as they move past said other end of said first outlet port, said radially outer edge of said first outlet port being spaced radially inwardly at all points therealong from the outer Walls of the compartments as they move therepast a distance such that the volume of liquid in the compartments between the radially outer edge of the first outlet port and the outer walls of the compartments is no less than said preselected volume of fluid that remains in the compartments as they move out of communication with the first outlet port whereby the initial contraction of the compartments discharges fluid contain-ing the centrifugally separated gaseous fluid from the first outlet port, and a second outlet port means.
partments to supply fluid to the compartments at a point inwardly of the outer peripheral wall.
4. A positivedisplacement rotary pump and separating apparatus comprising, means including a casing having a chamber therein and a rotor disposed in said chamber defining a plurality of expansible and contractible pumping compartments arranged in an annular bank around the rotor and having inner and outer walls, means for rotating said rotor about an axis paralleling said annular bank to centrifugally separate the fluids in the compartments, said rotor being located eccentrically in said chamber whereby the inner and outer walls of the compartments move away from each other during one portion of each revolution to progressively expand the compartments as they move past an inlet zone and the inner and outer walls move toward each other during a difli'erent portion of each revolution to progressively contract the compartments as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively diflerent densities whereby expansion of the compartments draws the fluids to be separated into the compartments, the casing including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby a preselected volume of fluid remains in the compartments when they move out of communication with said first outlet port, the radially outer edge of said first outlet port at said other end thereof being located to approximately merge with the innermost part of the compartments as they move past said other end of said first outlet port, said radially outer edge of said first outlet port being spaced radially inwardly at all points therealong from the outer -walls of the compartments as they move therepast a distance such that the volume of fluid in the compartments between the radially outer edge of the first outlet port and the outer walls of the compartments is no less than said preselected volume that remains in the compartments as they move out of communication with said first outlet port [whereby the initial contraction of the compartments discharges fluid containing the centrifiugally separated gaseous fluid from the first outlet port, and a second outlet port means spaced from the first outlet port and communicating with said compartments as they move past a second sector of said discharge zone whereby subsequent contraction of said compartments discharges the liquid fluid from the second outlet port means.
5. A positive displacement rotary pump and separating apparatus comprising, a casing defining a chamber, inner and outer eccentrically related rotors having interengaging teeth defining a plurality of segregated pumping compartments therebetween arranged in an annular bank, means for rotating said rotors about relatively eccentric axes whereby the compartments progressively expand during one portion of each revolution as they move past an inlet zone and progressively contract during a different portion of each revolution as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively different densities, whereby expansion of the compartments draws the fluids to be separated into the compartments, the casing including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port tenminating at its other end intermediate the ends of the discharge Zone whereby a preselected volume of fluid remains in the compartments when they move out of communioation with said first outlet Port, the radially outer edge of said first outlet port being shaped to approximately merge with the roots of the teeth on the inner rotor at said other end of said first outlet port, said radially outer edge being spaced radially inwardly from the roots of the teeth on the outer rotor at all points therealong a distance such that the volume of fluid in the compartments between the radially outer edge of the first outlet port and the teeth on the outer rotor is no less than said preselected volume that remains in the compartments when they move out of communication with said first outlet port whereby the initial contraction of the compartments discharges fluid containing the centritug-ally separated gaseous fluid from the first outlet port, and a second outlet port means spaced (from the first outlet port and communicating with said compartments as they move past a second sector of said discharge zone whereby subsequent contraction of said compartments dischargesthe liquid fluid from the second outlet port means.
6. The combination of claim 5 wherein the radially outer edge of said inlet port is spaced radially inwardly .from the roots of the teeth on the outer rotor at the end adjacent said first outlet port to supply fluid to the compartments at a point inwardly of the outer periphery of the compartments.
7. A positive displacement pump and separating apparatus comprising, means defining a plurality of expansible and contractible pumping compartments arranged in an annular bank and segregated from each other, said compartments having inner and outer walls, means for rotating said compartments about an axis paralleling the axis of said annular bank to centrifugally separate the fluids in the compartments into radially inner and outer layers according to the relative density of the fluids, said apparatus including means for effecting relative movement of the inner and outer Walls away from each other to progressively expand the compartments as they move past an inlet zone and for effecting relative movement of said inner and outer walls toward each other during a different portion of each revolution to progressively contract the compartments as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively different densitives whereby expansion of the compartments draws the fluids tobe separated into the compartments, said apparatus including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past -a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby-the inner walls of the compartments are spaced radially inwardly a preselected distance from the outer walls of the compartments as the compartments move out of communication with said first outlet port, the radially outer edge of said first outlet portat said other end thereof being spaced radially inwardly from the outer walls of the compartments ,a distance slightly less than said preselected distance, and said radially outer edge of said first outlet port at all other points therealong being spaced inwardly from the outer walls of the compartments a distance at least as great as the radial spacing at said other end whereby initial contraction of the compartments discharges fluid containing the centrifugally separated gaseous fluid through the first outlet port, and a second outlet port means spaced from the first outlet port and communicating with said compartments as they move past a second sector of said discharge zone whereby subsequent contraction of said compartments discharges liquid fluid from the second outlet port means.
8. A positive displacement rotary pump and separating apparatus comprising, a casing defining a chamber having a peripheral wall, a rotor mounted in said chamber for rotation about an axis eccentric to said peripheral wall, a plurality of vanes rotatable with the rotor and engaging the peripheral wall of the casing to define a plurality of segregated pumping compartments which progressively expand during one portion of each revolution as the compartments move past an inlet zone and progressively contract during another portion of each revolution as the compartments move past a discharge zone, inlet means including at least one inlet passage communicating with the compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively difiFerent densities whereby expansion of the compartments draws the fluids to be separated into the compartments, the casing including a first outlet port having one end communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby the periphery of the rotor is spaced a preselected distance from the peripheral wall of the casing as the compartments move out of communication with the first outlet port, the radially outer edge of the first outlet port at said other end thereof being spaced radially inwardly from the peripheral wall of the casing a distance slightly less than said preselected distance, and said radially outer edge of said first outlet port at all other points therealong being spaced inwardly from the peripheral wall of the casing a distance at least as great as the radial spacing at said other end whereby initial contraction of the compartments discharges fluid containing the centrifugally separated gaseous fluid through the first outlet port, and a second outlet port means spaced from the first outlet port and communicating with the compartments as they move past a second sector of said discharge zone whereby subsequent contraction of said compartments discharges liquid fluid from the second outlet port means.
9. A positive displacement rotary pump and separating apparatus comprising, a casing defining a chamber,
inner and outer eccentrically related rotors having interengaging teeth defining a plurality of segregated pumping compartments therebetween arranged in an annular bank, means for rotating said rotors about relatively eccentric axes whereby the compartments progressively expand during one portion of each revolution as they move past an inlet zone and progressively contract during a different portion of each revolution as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively diiferent densities, whereby expansion of the compartments draws the fluids to be separated into the compartments, the casing including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby a preselected volume of fluid remains in the compartments when they move out of communication 'with said first outlet port, the radially outer edge of said first outlet port being shaped to approximately merge with the roots of the teeth on the inner rotor at said other end of said first outlet port, said radially outer edge being spaced radially inwardly from the roots of the teeth on the outer rotor at all points therealong a distance such that the volume of fluid in the compartments between the radially outer edge of the first outlet port and the teeth on the outer rotor is no less than said preselected volume that remains in the compartments when they move out of communication with said first outlet port whereby the initial contraction of the compartments discharges fluid containing the centrifugally separated gaseous fluid 'from the first outlet port, and at least one second outlet port communicating with said compartments as they move past a second sector of said discharge zone, said second outlet port having one end extending crosswise of the compartments as they move therepast and angularly spaced from said other end of said first outlet port, said second outlet port having a trapping relief groove portion in said casing extending from said one end of said second port toward said first outlet port and located to communicate with the roots of the teeth in one of the gears.
10. A positive displacement rotary pump and separating apparatus comprising, a casing defining a chamber, inner and outer eccentrically related rotors having interengaging teeth defining a plurality of segregated pumping compartments therebetween arranged in an annular bank, means for rotating said rotors about relatively eccentric axes whereby the compartments progressively expand during one portion of each revolution as they move past an inlet zone and progressively contract during a diflerent portion of each revolution as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively different densities, whereby expansion of the compartments draws the fluids to be separated into the compartments, the casing including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet means and communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby a preselected volume of fluid remains in the compartments when they move out of communication with said first outlet port, the radially outer edge of said first outlet port being shaped to approximately rnerge with the roots of the teeth on the inner rotor at said other end of said first outlet port, said radially outer edge being spaced radially inwardly from the roots of the teeth on the outer rotor at all points therealong a distance such that the volume of fluid in the compartments between the radially outer edge of the first outlet port and the teeth on the outer rotor is no less than said preselected volume that remains in the compartments when they move out of communication with said first outlet port whereby the initial contraction of the compartments discharges fluid containing the centrifugally separated gaseous fluid from the first outlet port, at least one second outlet port communicating with said compartments as they move past a second sector of said discharge zone, said second outlet port having one end extending cross-wise of the compartments as they move therepast and angularly spaced from said other end of said first outlet port, said second outlet port having radially spaced inner and outer trapping relief groove portions in said casing extending from said one end of said second outlet port toward said other end of said first outlet port and positioned to respectively underlie the teeth on the inner and outer rotors and to communicate with a compartment adjacent the roots of the teeth on the inner and outer rotors when the seal point of the teeth on the inner and outer rotors moves across said one end of said second outlet port.
11. A positive displacement rotary pump and separating apparatus comprising, a casing defining a chamber, inner and outer eccentrically related rotors having intereng-aging teeth defining a plurality of segregated pumping compartments therebetween arranged in an annular bank, means for rotating said rotors about relative-1y eccentric axes whereby the compartments progressively expand during one portion of each revolution as they move past an inlet zone and progressively contract during a 'diifercnt portion of each revolution as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto containing liquid and gaseous fluids of relatively different densities, whereby expansion of the compartments draws the fluids to be separated into the compartments, the casing including a first outlet port having one end angularly spaced in the direction of rotation of the compartments from said inlet meansand communicating with said compartments at the side thereof as they move past a first sector of said discharge zone, said first outlet port terminating at its other end intermediate the ends of the discharge zone whereby a preselected volume of fluid remains in the compartments when they move out of communication with said first outlet port, the radially outer edge of said first outlet port being shaped to approximately merge with the roots of the teeth on the inner rotor at said other end of said first outlet port, said radially outer edge being spaced radially inwardly from the roots of the teeth on the outer rotor at all points therealong a distance such that the volume of fluid in the compartments between the radially outer edge of the first outlet port and the teeth on the outer rotor is no less than said preselected volume that remains in the compartments when they move out of communication with said first outlet port whereby the initial contraction of the compartments discharges fluid containing the centrifugally separated gaseous fluid from the first outlet port, second and third outlet ports communicating with said compartments as they move past a second sector of said discharge zone, said second outlet port having first and second ends angularly spaced from said first and third outlet ports, respectively, said second port having trapping relief groove portions extending from the first and second ends thereof toward said first and third outlet ports and located to communicate with the roots of the teeth in one of the gears.
12. A positive displacement pump comprising, a casing defining a chamber, inner and outer eccentrically related rotors having interengaging teeth defining a plurality of segregated pumping compartments therebetween arranged in an annular bank, means for rotating said rotors about relatively eccentric axes whereby the compartments progressively expand during one portion of each revolution as they move past an inlet zone and progressively contract during a diiferent portion of each revolution as they move past a discharge zone, in-let means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto, first and second outlet ports communicating with said compartments at the side thereof as they move past said discharge zone, said first outlet port having one end angularly spaced from said inlet port and the other end angularly spaced from one end of said second outlet port, said second outlet port having radially spaced inner and outer trapping relief groove portions extending from said one end toward said first port and positioned to respectively underlie the teeth on the inner and outer rotors and to communicate with the compartments adjacent the roots of the teeth on the inner and outer rotors when the seal point between the teeth on the inner and outer rotors moves across said one end of said second outletport.
13. A positive displacement pump comprising, a casing defining a chamber, inner and outer eccentrically related rotors having interengaging teeth defining a plurality of segregated pumping compartments therebetween arranged in an annular bank, means for rotating said rotors about relatively eccentric axes whereby the compartments progressively expand during one portion of each revolution as they move past an inlet zone and progressively contract during a different portion of each revolution as they move past a discharge zone, inlet means including at least one inlet passage communicating with said compartments as they move past said inlet zone for supplying fluid thereto, first and second outlet ports communicating with said compartments at the side thereof as they move past said discharge zone, said first outlet port having one end angularly spaced from said inlet p011 and the other portion angularly spaced from one end of said second outlet port, said other end portion of said first outlet port being located to underlie the teeth on the inner rotor and communicate with the compartments only adjacent the roots of the teeth on the inner rotor, said second outlet port having a trapping relief groove portion extending from said one end of said second outlet port toward said first outlet port and spaced radially outwardly from said one end portion of said first port to underlie the teeth on the outer rotor an to communicate with the compartments only adjacent the roots of the teeth on the outer rotor when the seal point between the teeth on the inner and outer rotors moves across said one end of said second outlet port.
14. In combination with a liquid receptacle, a positive displacement pump apparatus for pumping fluid from the receptacle and for returning the lighter centrifugally separated fluids to the receptacle comprising, means defining a plurality of expansible and contractible pumping compartments arranged in an annular bank and segregated from each other, said compartments having inner and outer walls, means for rotating said compartments about an axis paralleling the axis of said annular bank to centrifugally separate the fluids in the compartments, said apparatus including means for effecting relative movement of the inner and outer walls away from each other during one portion of each revolution to progressively expand the compartments as they move past an inlet zone and for effecting relative movement of the inner and outer walls of the compartments toward each other during a different portion of each revolution to progressively contract the compartments as they move past a discharge zone, inlet means communicating with said receptacle and including at least one inlet port communicating with said compartments as they move past the inlet zone whereby expansion of the compartments draws fluid from the receptacle into the compartments, a first gas outlet port angularly spaced in the direction of rotation of the compartments from said inlet port and positioned radially inwardly from the outer walls of the compartments and closely adjacent the inner walls of the compartments to communicate with the compartments as they move past a first sector of said discharge zone whereby the intial contraction of the compartments forces the lighter centrifugally separated fluid from adjacent the inner periphery of the compartments through the first outlet port, passage means connecting the first outlet port with said receptacle to vent the lighter centrifugally separated fluid from the outlet port to the receptacle, and a second outlet port spaced from the first outlet port and communicating with said compartments as they move past a second sector of said discharge zone whereby subsequent contraction of said compartments discharges the liquid fluid from the second outlet port.
References Cited by the Examiner UNITED STATES PATENTS 1,345,895 8/1920 Seguin 103-113 1,902,315 3/1933 Vogt 103-126 2,053,919 9/1936 Pigott 103126 2,217,211 10/1940 Brady 103-113 2,416,987 3/ 1947 Fleischer 103-426 2,417,701 3/1947 Parsons 103126 2,539,044 1/ 1951 Walsh 103--126 2,732,802 1/1956 Eames 103126 3,137,234 6/1964 Mosbacher 103-2 MARK NEWMAN, Primary Examiner.
SAMUEL LEVINE, Examiner.
W. L. FREEH, Assistant Examiner.

Claims (1)

1. A POSITIVE DISPLACEMENT PUMP AND SEPARATING APPARATUS COMPRISING, MEANS DEFINING A PLURALITY OF EXPANSIBLE AND CONTRACTIBLE PUMPING COMPARTMENTS ARRANGED IN AN ANNULAR BANK AND SEGREGATED FROM EACH OTHER, SAID COMPARTMENTS HAVING INNER AND OUTER WALLS, MEANS FOR ROTATING SAID COMPARTMENTS ABOUT AN AXIS PARALLELING THE AXIS OF SAID ANNULAR BANK TO CENTRIFUGALLY SEPARATE THE FLUIDS IN THE COMPARTMENTS INTO RADIALLY INNER AND OUTER LAYERS ACCORDING TO THE RELATIVE DENSITY OF THE FLUIDS, SAID APPARATUS INCLUDING MEANS FOR EFFECTING RELATIVE MOVEMENT OF THE INNER AND OUTER WALLS AWAY FROM EACH OTHER TO PROGRESSIVELY EXPAND THE COMPARTMENTS AS THEY MOVE PAST AN INLET ZONE AND FOR EFFECTING RELATIVE MOVEMENT OF SAID INNER AND OUTER WALLS TOWARD EACH OTHER DURING A DIFFERENT PORTION OF EACH REVOLUTION TO PROGRESSIVELY CONTRACT THE COMPARTMENTS AS THEY MOVE PAST A DISCHARGE ZONE, INLET MEANS INCLUDING AT LEAST ONE INLET PASSAGE COMMUNICATING WITH SAID COMPARTMENTS AS THEY MOVE PAST SAID INLET ZONE FOR SUPPLYING FLUID THERETO CONTAINING LIQUID AND GASEOUS FLUIDS OF RELATIVELY DIFFERENT DENSITIES WHEREBY EXPANSION OF THE COMPARTMENTS DRAWS THE FLUIDS TO BE SEPARATED INTO THE COMPARTMENTS, SAID APPARATUS INCLUDING A FIRST OUTLET PORT
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US3390638A (en) * 1966-08-08 1968-07-02 Power Engineering Inc Variable proportioning metering pump
US3435773A (en) * 1966-09-28 1969-04-01 Kaelle Regulatorer Ab Gear pump
US3511581A (en) * 1967-06-01 1970-05-12 Fuelmaster Produktie Mij Nv T Gear pump
WO1980000174A1 (en) * 1978-06-22 1980-02-07 Caterpillar Tractor Co Gear pump having fluid deaeration capability
US4299547A (en) * 1978-11-11 1981-11-10 Robert Bosch Gmbh Rotary fuel injection pump with two compression openings
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US4355964A (en) * 1980-08-22 1982-10-26 Caterpillar Tractor Co. Gear pump having fluid deaeration capability
US4619588A (en) * 1984-04-25 1986-10-28 Facet Enterprises, Incorporated Wet motor gerotor fuel pump with vapor vent valve and improved flow through the armature
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US20130004357A1 (en) * 2011-06-30 2013-01-03 Peopleflo Manufacturing, Inc. Positive-displacement rotary pump having a positive-displacement auxiliary pumping system
US10995757B2 (en) * 2016-06-22 2021-05-04 Pierburg Pump Technology Gmbh Dry-running gas vane pump having a first fluid outlet and a second fluid outlet associated with the pump chamber with the second fluid outlet permanently open to atmosphere without being impeded

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3390638A (en) * 1966-08-08 1968-07-02 Power Engineering Inc Variable proportioning metering pump
US3435773A (en) * 1966-09-28 1969-04-01 Kaelle Regulatorer Ab Gear pump
US3511581A (en) * 1967-06-01 1970-05-12 Fuelmaster Produktie Mij Nv T Gear pump
WO1980000174A1 (en) * 1978-06-22 1980-02-07 Caterpillar Tractor Co Gear pump having fluid deaeration capability
US4231726A (en) * 1978-06-22 1980-11-04 Caterpillar Tractor Co. Gear pump having fluid deaeration capability
US4299547A (en) * 1978-11-11 1981-11-10 Robert Bosch Gmbh Rotary fuel injection pump with two compression openings
WO1982000689A1 (en) * 1980-08-22 1982-03-04 Cobb D Gear pump having fluid deaeration capability
US4355964A (en) * 1980-08-22 1982-10-26 Caterpillar Tractor Co. Gear pump having fluid deaeration capability
US4619588A (en) * 1984-04-25 1986-10-28 Facet Enterprises, Incorporated Wet motor gerotor fuel pump with vapor vent valve and improved flow through the armature
US4662827A (en) * 1984-04-25 1987-05-05 Facet Enterprises, Inc. Wet motor geroter fuel pump
US5004407A (en) * 1989-09-26 1991-04-02 Sundstrand Corporation Method of scavenging air and oil and gear pump therefor
US5733111A (en) * 1996-12-02 1998-03-31 Ford Global Technologies, Inc. Gerotor pump having inlet and outlet relief ports
US20130004357A1 (en) * 2011-06-30 2013-01-03 Peopleflo Manufacturing, Inc. Positive-displacement rotary pump having a positive-displacement auxiliary pumping system
US8608465B2 (en) * 2011-06-30 2013-12-17 Peopleflo Manufacturing, Inc. Positive-displacement rotary pump having a positive-displacement auxiliary pumping system
US10995757B2 (en) * 2016-06-22 2021-05-04 Pierburg Pump Technology Gmbh Dry-running gas vane pump having a first fluid outlet and a second fluid outlet associated with the pump chamber with the second fluid outlet permanently open to atmosphere without being impeded

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