US3376823A - Rotary piston hydraulic pump - Google Patents

Rotary piston hydraulic pump Download PDF

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Publication number
US3376823A
US3376823A US519916A US51991666A US3376823A US 3376823 A US3376823 A US 3376823A US 519916 A US519916 A US 519916A US 51991666 A US51991666 A US 51991666A US 3376823 A US3376823 A US 3376823A
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United States
Prior art keywords
chambers
pump
pistons
gear
fluid
Prior art date
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Expired - Lifetime
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US519916A
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English (en)
Inventor
Grosjean Otto Alphonse
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Individual
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Individual
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Publication date
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Publication of US3376823A publication Critical patent/US3376823A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/126—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Definitions

  • the rotary pistons are rotatably mounted in two parallel cylindrical chambers, one inlet and one outlet communicates with the chambers and each piston has a semi-circular cross-section, the cylindrical part of which has teeth forming a gear, one gear being rotated by a motor to drive the other gear, and both gears being adapted during operation of the pump successively to suck in fluid through the inlet conduit into the chambers, to block ofi the inlet conduit, and by centrifugal effect, to create an overpressure of fluid in the chamber whereby the fluid is driven out of the chambers across the teeth of the piston-gears through the outlet conduit.
  • the speed of rotation of the pistons can be of 2700 r.p.m. and the pressure at the outlet can attain 18 atmospheres.
  • the diameter of the pistons of these pumps must be fairly large, which consequently makes such pumps relatively cumbersome, and causes the pistons to develop large moments of torque during rapid rotation.
  • the present invention aims precisely to reduce the dimensions and to increase the robustness of such pumps by providing a pump which departs considerably from those which have just been described.
  • the invention provides a hydraulic pump with rotary pistons comprising a body having two parallel cylindrical chambers and a piston rotatably mounted in each chamber, at least one inlet conduit communicating with the chambers, and at least one outlet conduit communicating with the chambers, each piston comprising a cylindrical gear provided with at least one recess extending along part of the length of the gear, one gear being adapted to be driven in rotation by a motor and to drive the other gear, both gears being adapted, during operation of the pump, successively to suck in fluid through the inlet conduit into the chambers, to block off the inlet conduit, and, by the centrifugal effect, to create an overpressure of fluid in the chambers, whereby the fluid is driven out of the chambers through the outlet conduit.
  • each recess is substantially plane and is parallel to the axis of its corresponding gear. It is also preferable that the recess extend over the major part of the length of the gear.
  • FIGURE 1 is an axial section view of the pump
  • FIGURE 2 is a sectional view along IIII of FIG- URE 1 of the same pump;
  • FIGURE 3 is a side view of one of the pistons
  • FIGURES 4a, 4b and 4c represent three successive positions of the pistons during operation of the pump.
  • the pump has a cylindrical body 1 in which are provided two parallel cylindrical chambers 11 and 11', adapted to receive rotary pistons or gears 3 and 4 trunnioned in the bearings 33, 43' and 33, 43 respectively. These latter bearings are disposed in a cover 2 rigidly attached to the body 1 of the pump by the securing screw 8.
  • the shaft 5 of the driving gear 3 passes through the cover 2 and is actuated by a motor (not shown), for example an electric motor.
  • the fluid is introduced into the pump by an inlet conduit'6.
  • the pump drives out the fluid through an outlet conduit 7.
  • the driving gear 3 meshes with the driven gear 4 by means of teeth 30 and 40 respectively.
  • a screw 71 for regulating the outlet flow of the fluid is disposed and abuts perpendicularly to the outlet conduit 7.
  • the two rotary pistons formed by the gears 3 and 4 have a plane surface 310 and 410, respectively, passing through the axis of the gears.
  • the bodies 31 and 32 of the pistons 3 and 4, respectively, are semi-circular in cross-section.
  • the arrows f and f indicate the preferred direction of rotation for which the pump is the most efiicient.
  • FIGURE 3 shows the gear 3.
  • This gear has a plane rec-' tangular surface 310 constituting the active part of the piston.
  • the gear 3 has teeth 30 on the cheeks 30' and 30" and extending between the cheeks on the cylindrical portion of the gear.
  • FIGURES 422, 4b and 4c The operation of the pump, schematically shown by FIGURES 422, 4b and 4c is as follows:
  • the pistons then block the inflow of fluid (FIGURE 4b) which, emprisoned in the chambers 32 and 42, is centrifuged by the rotation of the pistons and exerts on the surface of the chambers an overpressure, under the action of which part of the fluid escapes across the teeth of the cheeks 30" and 40" by the part of the conduit 7 which opens into the chambers.
  • the pistons having arrived at the position represented in FIGURE 40, block off the outlet conduit 7. 'Part of the fluid introduced in the chambers 32 and 42 having been ejected, a suction is produced in the chambers which, when they are presented again in front of the inlet conduit 6, sucks in fluid again.
  • the pump only discharges during the period which separates the FIGURES 4b and 4c. Nevertheless, the elevated speed of rotation (2,700 revolutions per minute) generates a quasi-contiuous discharge.
  • the recesses of the gears constituting the pistons can have a different form, that their bottom need not pass through the axis of the piston.
  • the piston can have a single central cheek dividing the recess in two, in place of the two cheeks 30 and 30" at the ends of the recess.
  • the symmetrical position of the outlet conduit 7 with respect to the two chambers can be arranged differently, for example, a separate conduit could be provided in each of the cylindrical chambers.
  • the pump according to the invention has the advantage of small dimensions, and can be, for example, of the same dimensions as the accompanying drawing. Thus the pistons have only to support small moments of torque.
  • This pump is finally extremely robust, and is very reliable. Itis particularly silent and the pressure at the outlet can attain 18 atmospheres.
  • a hydraulic pump comprising: a body having two parallel cylindrical chambers; a piston rotatably mounted in each chamber; at least one inlet conduit communicating with said chambers; at least one outlet conduit communicating with said chambers; each piston having a plane rectangular surface and a cylindrical portion having spaced teeth extending longitudinally along said cylindrical portion in communication with said outlet conduit, and forming passages parallel thereto whereby said pistons form gears; one of said gears being adapted to be rotated by a motor and meshing with said other gear to drive the same; both gears being adapted, during operation of the pump, successively to suck in fluid through said inlet conduit into said chambers, to block off said inlet conduit, and, by centrifugal effect, to create an overpressure in said chambers, whereby fluid is driven out of said chambers across said teeth of said pistons through said outlet conduit.
  • a pump according to claim 1 in which two cheeks are provided on each of said gears, one check at each end of each gear, the teeth of said gears extending over said cheeks as well as over said cylindrical portion of said gear between said cheeks.
  • a pump according to claim 1 in which said outlet conduit is parallel to the axis of said gears and opens simultaneously into each of said chambers during rotation of said pistons.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
US519916A 1965-01-11 1966-01-11 Rotary piston hydraulic pump Expired - Lifetime US3376823A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH45465A CH412585A (fr) 1965-01-11 1965-01-11 Pompe hydraulique à pistons rotatifs

Publications (1)

Publication Number Publication Date
US3376823A true US3376823A (en) 1968-04-09

Family

ID=4187384

Family Applications (1)

Application Number Title Priority Date Filing Date
US519916A Expired - Lifetime US3376823A (en) 1965-01-11 1966-01-11 Rotary piston hydraulic pump

Country Status (5)

Country Link
US (1) US3376823A (fr)
AT (1) AT254701B (fr)
CH (1) CH412585A (fr)
FR (1) FR1462784A (fr)
NL (1) NL6600060A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080050262A1 (en) * 2006-08-24 2008-02-28 Sam J. Jacobsen Rotary pump having a valve rotor and one or more vane rotors and methods for pumping fluids
US20160238005A1 (en) * 2013-10-01 2016-08-18 Maag Pump Systems Ag Gear pump with improved pump inlet

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12350A (en) * 1855-02-06 Elliptical oe kotary pump
US31597A (en) * 1861-03-05 Rotaey pump
US60366A (en) * 1866-12-11 moekis
US137055A (en) * 1873-03-25 Improvement in rotary pumps
US258535A (en) * 1882-05-23 Rotary pump and motor
US884812A (en) * 1907-02-27 1908-04-14 Horatio G Gillmor Rotary motor.
US2669840A (en) * 1948-03-24 1954-02-23 Joy Mfg Co Pulsator operated percussive device
US2697911A (en) * 1948-03-24 1954-12-28 Joy Mfg Co Pulsating apparatus and shaker drives incorporating the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12350A (en) * 1855-02-06 Elliptical oe kotary pump
US31597A (en) * 1861-03-05 Rotaey pump
US60366A (en) * 1866-12-11 moekis
US137055A (en) * 1873-03-25 Improvement in rotary pumps
US258535A (en) * 1882-05-23 Rotary pump and motor
US884812A (en) * 1907-02-27 1908-04-14 Horatio G Gillmor Rotary motor.
US2669840A (en) * 1948-03-24 1954-02-23 Joy Mfg Co Pulsator operated percussive device
US2697911A (en) * 1948-03-24 1954-12-28 Joy Mfg Co Pulsating apparatus and shaker drives incorporating the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080050262A1 (en) * 2006-08-24 2008-02-28 Sam J. Jacobsen Rotary pump having a valve rotor and one or more vane rotors and methods for pumping fluids
US20160238005A1 (en) * 2013-10-01 2016-08-18 Maag Pump Systems Ag Gear pump with improved pump inlet
US9528515B2 (en) * 2013-10-01 2016-12-27 Maag Pump Systems Ag Gear pump with improved pump inlet

Also Published As

Publication number Publication date
AT254701B (de) 1967-06-12
CH412585A (fr) 1966-04-30
NL6600060A (fr) 1966-07-12
FR1462784A (fr) 1966-12-16

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