US3791765A - Liquid pump, particularly a fuel-oil pump - Google Patents

Liquid pump, particularly a fuel-oil pump Download PDF

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Publication number
US3791765A
US3791765A US00189537A US3791765DA US3791765A US 3791765 A US3791765 A US 3791765A US 00189537 A US00189537 A US 00189537A US 3791765D A US3791765D A US 3791765DA US 3791765 A US3791765 A US 3791765A
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US
United States
Prior art keywords
liquid
pump
casing
suction chamber
casing member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00189537A
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English (en)
Inventor
G Hansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss AS
Original Assignee
Danfoss AS
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Filing date
Publication date
Application filed by Danfoss AS filed Critical Danfoss AS
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Publication of US3791765A publication Critical patent/US3791765A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers

Definitions

  • the assembly has a rotating casing member in which pumping elements are housed and which is surrounded by a casing so as to form a suction chamber which surrounds the rotating casing member.
  • the rotation of the casing member causes liquid in the suction chamber to also rotate-and form a ring of liquid.
  • the rotating casing member has an eccentrically positioned inlet which passes through the ring of liquid so formed once during each cycle of rotation and this insures the introduction of liquid, as distinguished from only air, into the inlet.
  • the invention relates to a liquid pump, particularly a fueloil pump, having a suction chamber on the input side and an eccentric intake orifice in the pump casing.
  • a further difficulty is that liquid pumps are mounted in a very large variety of positions. If the pump has an eccentric intake orifice, permitting the use of a relatively short suction passage which therefore offers little resistance to flow, then there exists the possibility that the intake orifice will be disposed at the top in the case of a pump having a horizontal shaft. This means that even when only a little air passes into the suction chamber, the intake orifice lies entirely above the level of the oil. It is therefore known to provide the intake orifice in the middle or at least in the middle zone of the pump in order to ensure that the intake orifice is covered with liquid at the moment of start-up, irrespective of the position in which the pump is installed.
  • the object of the invention is to provide a liquid pump of the initially described kind which enables an eccentric intake orifice to be used but which nevertheless permits the full delivery pressure to be reached in a short start-up period and in any position in which the pump is installed, and which also makes it possible for the intake opening to terminate directly in the suction chamber while achieving proper discharge of air during normal operation of the pump.
  • this object is achieved by providing, in the suction chamber, a circulating element which rotates the liquid contained in the suction chamber and which rotates with the pump drive.
  • the liquid caused to rotate forms a circle inside which air is located. Generally, an annular intermediate zone containing a mixture. of air and liquid is also formed. If the radius of the air chamber or of the transition zone exceeds the eccentricity of the intake orifice, then the pump continuously draws off some air in addition to the liquid. The position in which the pump is installed does not affect the situation since even when the eccentric intake orifice is not covered at all by liquid at the moment of start-up, then after a few revolutions of the circulating element the liquid is distributed in such manner that the pump can take in liquid.
  • the circulating element is constituted by the pump casing. This results in a very simple construction. Furthermore, the intake orifice moves over a circular path. Even if it should lie in the air chamber during start-up of the pump, then after the casing has rotated over a short distance the intake orifice becomes immersed in the liquid and the pump can start to deliver.
  • the inlet orifice to the suction chamber has a smaller radial clearance than the intake orifice. ln an arrangement of this kind the liquid is driven by centrifugal force even when on its way from the inlet orifice to the intake orifice. The pump therefore acquires a greater suction capacity.
  • the pump casing may be profiled to improve rotation. For example, screws which are otherwise sunk into the casing may project by their heads into the suction chamber.
  • suction chamber extends in known manner over the periphery of the pump casing. Then the peripheral surface of the pump casing also contributes towards rotating the liquid in a positive manner.
  • the rotor of the electric drive motor may be part of the pump casing and the latter may be mounted on a stationary shaft upon which a gearwheel of the pump is secured. This results in a pump of very simple construction.
  • the suction chamber may be bounded at its ends by two wallsin which the shaft is held, and along its periphery by a wall extending through the gap between the rotor and stator of the motor.
  • the suction chamber may be bounded at its ends by two wallsin which the shaft is held, and along its periphery by a wall extending through the gap between the rotor and stator of the motor.
  • the pressure duct can extend outwardly through the shaft. This obviates the need for a gland between the motor and the pump.
  • FIG. 1 is an axial section through a liquid pump according to the invention.
  • FIG. 2 is a cross-section along the line AA of FIG.
  • the liquid pump embodies a drive motor comprising a stator 1 and a rotor 2.
  • the latter is part of the pump casing 3 since a rotor element 4, a ring 5 and an end plate 6 are joined together by means of screw-bolts 7.
  • the ring has an eccentric opening in which a toothed ring 8 rotates.
  • This, together with a toothed wheel 9 constitutes pump chambers 10 which intermittently increase and decrease in size.
  • the toothed wheel 9 is secured to a shaft 12 by means of a pin 11 so that it cannot rotate relatively to the shaft which is secured in two end walls 13 and 14.
  • the end walls are interconnected by a peripheral wall 15 which extends through the gap between the stator and the rotor of the motor.
  • the pump is also enclosed by two casing parts l6 and 17.
  • the walls 13, 14 and 15 define a suction chamber 18. This has an inlet orifice 19.
  • the liquid contained in the suction chamber flows around the entire pump casing 3 and also flows over the rotor 2.
  • an off-centre intake orifice'20 which is located at the same level as the chamber 10 formed by teeth.
  • An outlet passage 21 in the end plate 6 leads by way of an annular groove 22 to an axial bore 23 in the shaft 12 through which bore'pressurized liquid can be drawn off.
  • the radius R of the intake orifice 20 is greater than the radius R of the inlet orifice 19.
  • the casing 3 rotates in the suction chamber 18.
  • the oil contained therein is forced outwards by centrifugal force, the entire surface of the pump casing 3, including the profiled portions formed by the heads 7 of the screws, becoming effective.
  • the air contained in the suction chamber passes into the interior of the circle of liquid.
  • part of the air is discharged through the suction orifice with the liquid. Since in practice there is no well-defined interface between the liquid and the air, but a transition zone in which there is a mixture of air and liquid, air is discharged in a still more uniform manner.
  • a pump assembly comprising a casing member rotatable about a fixed axis, a casing surrounding said casing member and forming a suction chamber therebetween, said casing member having an inlet eccentrically spaced relative to said axis, said casing has an intake orifice eccentrically spaced relative to said axis, said inlet being spaced a greater distance from said axis than said intake orifice.
  • a pump assembly according to claim 1 including a centrally disposed shaft in fixed relation to said casing, an electric drive motor having a rotor and a stator, said rotor being attached to said casing for rotation therewith.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US00189537A 1970-10-17 1971-10-15 Liquid pump, particularly a fuel-oil pump Expired - Lifetime US3791765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702051036 DE2051036A1 (de) 1970-10-17 1970-10-17 Flüssigkeitspumpe, insbesondere Heizölpumpe

Publications (1)

Publication Number Publication Date
US3791765A true US3791765A (en) 1974-02-12

Family

ID=5785404

Family Applications (1)

Application Number Title Priority Date Filing Date
US00189537A Expired - Lifetime US3791765A (en) 1970-10-17 1971-10-15 Liquid pump, particularly a fuel-oil pump

Country Status (9)

Country Link
US (1) US3791765A (de)
BE (1) BE773911A (de)
CH (1) CH532718A (de)
DE (1) DE2051036A1 (de)
FR (1) FR2111402A5 (de)
GB (1) GB1398079A (de)
IT (1) IT942691B (de)
NL (1) NL7113795A (de)
SE (1) SE375133B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645430A (en) * 1984-04-25 1987-02-24 Facet Enterprises, Inc. Wet motor gerotor fuel pump with self-aligning bearing
US20050042124A1 (en) * 2003-07-07 2005-02-24 Naoki Miyagi Small size gear pump
US20190010943A1 (en) * 2016-01-12 2019-01-10 Pierburg Pump Technology Gmbh Automotive electrical oil pump
US10989192B2 (en) * 2016-01-12 2021-04-27 Pierburg Pump Technology Gmbh Automotive electrical oil pump

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662827A (en) * 1984-04-25 1987-05-05 Facet Enterprises, Inc. Wet motor geroter fuel pump
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
DE4106060C2 (de) * 1991-02-27 1995-11-30 Fresenius Ag Pumpe, insbesondere gekapselte medizinische Pumpe
KR100391007B1 (ko) * 1996-12-03 2003-07-12 댄포스 아/에스 모터 펌프 유니트
WO2000008338A1 (en) 1998-08-06 2000-02-17 Automotive Motion Technology Limited A motor driven pump
GB9817155D0 (en) * 1998-08-06 1998-10-07 Automotive Motion Tech Ltd Screw pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1496222A (en) * 1923-05-01 1924-06-03 Hill Compressor & Pump Company Sealing means for rotary pumps
GB382227A (en) * 1931-05-15 1932-10-20 Bosch Robert Improvements in or relating to refrigerating machines
US2760348A (en) * 1952-08-05 1956-08-28 Wetmore Hodges Motor-compressor in plural temperature refrigerating system
FR1237083A (fr) * 1958-11-19 1960-07-22 Therma Ag Ensemble compresseur hermétiquement fermé pour réfrigérateurs
US3531220A (en) * 1968-08-15 1970-09-29 Danfoss As Oil-feed equipment operable as a single-line or double-line system
US3574489A (en) * 1969-04-04 1971-04-13 Compudrive Corp Orbital drive and fluid motor incorporating same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1496222A (en) * 1923-05-01 1924-06-03 Hill Compressor & Pump Company Sealing means for rotary pumps
GB382227A (en) * 1931-05-15 1932-10-20 Bosch Robert Improvements in or relating to refrigerating machines
US2760348A (en) * 1952-08-05 1956-08-28 Wetmore Hodges Motor-compressor in plural temperature refrigerating system
FR1237083A (fr) * 1958-11-19 1960-07-22 Therma Ag Ensemble compresseur hermétiquement fermé pour réfrigérateurs
US3531220A (en) * 1968-08-15 1970-09-29 Danfoss As Oil-feed equipment operable as a single-line or double-line system
US3574489A (en) * 1969-04-04 1971-04-13 Compudrive Corp Orbital drive and fluid motor incorporating same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645430A (en) * 1984-04-25 1987-02-24 Facet Enterprises, Inc. Wet motor gerotor fuel pump with self-aligning bearing
US20050042124A1 (en) * 2003-07-07 2005-02-24 Naoki Miyagi Small size gear pump
US7500837B2 (en) * 2003-07-07 2009-03-10 Naoki Miyagi Small size gear pump
US20190010943A1 (en) * 2016-01-12 2019-01-10 Pierburg Pump Technology Gmbh Automotive electrical oil pump
US10989192B2 (en) * 2016-01-12 2021-04-27 Pierburg Pump Technology Gmbh Automotive electrical oil pump
US11078905B2 (en) * 2016-01-12 2021-08-03 Pierburg Pump Technology Gmbh Automotive electrical oil pump

Also Published As

Publication number Publication date
GB1398079A (en) 1975-06-18
CH532718A (de) 1973-01-15
BE773911A (fr) 1972-01-31
DE2051036A1 (de) 1972-04-20
FR2111402A5 (de) 1972-06-02
SE375133B (de) 1975-04-07
IT942691B (it) 1973-04-02
NL7113795A (de) 1972-04-19

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