US3491697A - Hydraulic fuel oil pump or the like - Google Patents

Hydraulic fuel oil pump or the like Download PDF

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Publication number
US3491697A
US3491697A US686391A US3491697DA US3491697A US 3491697 A US3491697 A US 3491697A US 686391 A US686391 A US 686391A US 3491697D A US3491697D A US 3491697DA US 3491697 A US3491697 A US 3491697A
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US
United States
Prior art keywords
pump
oil
chamber
suction
inlet
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
US686391A
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English (en)
Inventor
Jorgen Hartvig Petersen
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Danfoss AS filed Critical Danfoss AS
Application granted granted Critical
Publication of US3491697A publication Critical patent/US3491697A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/142—Fuel pumps
    • 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
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • 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
    • F04C2210/00—Fluid
    • F04C2210/24—Fluid mixed, e.g. two-phase fluid

Definitions

  • the invention relates to hydraulic pumps and particularly to the providing of a novel inlet chamber arrangement.
  • the inlet chamber arrangement includes a centrally located inlet chamber to which a liquid such as oil is delivered through radially extending passages.
  • a tangentially extending passage extends tangentially relative to the inlet chamber and connects the inlet chamher with the suction producing pumping elements.
  • the tangentially extending passage causes the liquid in the inlet chamber to rotate and thereby provide certain advantage relating to the operation of the pump, including improved operation when the liquid supplied to the pump is at a relatively low level.
  • This invention relates to a hydraulic pump, especially a fuel oil pump having a suction port arranged in a vertical wall and a preliminary chamber preceding the suction port, the chamber being divided from the suction chamber by a partition with inlet ports.
  • a hydraulic pump in which the suction port is arranged centrally and the inlet port consists of a slot extending in outward direction from the center, or of several bores situation on such a radial line.
  • the inlet port is comparable to a passage the resistance of which varies with the liquid level in the suction chamber. The lower the liquid level drops, the higher the resistance opposing the flow of the liquid, and the more air is drawn off along with the liquid.
  • the present invention has for its object to draw off the air in a pump of the type referred to with a smaller loss of pressure and provides for a pump operating independently of its working position so long as the pump shaft is substantially horizontal.
  • the preliminary chamber is axially symmetrical
  • the suction port is situated close to the periphery of the preliminary chamber and extends tangentially and ducts extending in outward direction from the preliminary chamber connect the inlet ports with the chamber.
  • the air is intimately mixed with the liquid because the most highly concentrated liquid is always present at the point where air is admitted since, due to centrifugal force, the unmixed liquid is forced upwards the periphery while the aerated liquid foam remains in the centre region of the preliminary chamber. In this region the foam cushion also attenuates noise created by the pump shaft.
  • the above-mentioned ducts preferably extend radially and are uniformly distributed over the circumference of the preliminary chamber.
  • at least three ducts are provided. In this way, complete positional independence of the pump is achieved with a minimum of means.
  • the longitudinal dimension of the inlet ports may be kept small in relation to their cross section. This increases their operational independence on the viscosity of the liquid. It is sufficient for the size of the inlet port to be adapted to the suc tion capacity of the pump.
  • the delivery chamber of the pump surrounds the gears on both sides in known manner. This design also improves the hydraulic equilibrium of the gear.
  • a pump having the above-described characteristics is capable of operating with suction heads only 20 mm. below barometric pressure, i.e. up to about 710 mm. Hg.
  • suction heads only 20 mm. below barometric pressure, i.e. up to about 710 mm. Hg.
  • the preliminary chamber, the ducts and the inlet ports be provided in a cap attached to the end of the pump.
  • a cover plate on the end face of the pump may contain a shaft bearing as well as the suction port communicating with the connection duct, and the suction and delivery chambers on one side of the gears.
  • An intermediate plate between the gears and the pump housing may then be provided with the suction and delivery chambers on the other side of the gears. At least one of these plates may be produced by sintering, a very inexpensive process of manufacture.
  • FIG. 1 shows an oil pump designed according to the invention in which cover, diaphragm and filter have been removed;
  • FIG. 2 shows a longitudinal section along the line AA of FIG. 1;
  • FIG. 3 is a part-sectional view along the line BB of FIG. 1;
  • FIG. 4 is a part-sectional view along the line CC of FIG. 1.
  • the ducts 1 connect the pump intake with a distribution chamber 2 arranged between a cover 3 and a filter 4.
  • the oil entering the chamber is sucked into a suction chamber I through the filter 4, the suction chamber being provided with a rubber diaphragm 5 which, together with the air space behind it, is capable of equalizing the pressure fluctuations of the pump.
  • From the suction chamber I oil passes through the inlet ports 6 and radial ducts into an axially symmetrical preliminary chamber II.
  • the last-mentioned parts are provided in a cap 7 which is mounted on the pump by means of bolts 8, a plate 9 being interposed.
  • the bolts 8 also hold a cover plate 31, a gear plate 19 and an intermediate plate 32 to the pump housing 33.
  • the inlet ports 6 are bores in a surface inclined by 45 to the axis of the shaft. Therefore the projection of the port cross-section on the duct cross-section, and also on the end face of cover plate 31, is smaller than the effective cross-section of the port.
  • the bores extend coaxially, so that the ports 6 virtually have no longitudinal dimension which would make their efficiency depend on viscosity.
  • the cover plate 31 In the cover plate 31 is provided aduct 11 which constitutes a tangential continuation of the preliminary chamber 2 and forms a suction port 36 on the end face of the cover plate 31.
  • the duct 11 leads through another bore 12 into the inlet chamber of the pump which latter is formed by a toothed gear 16 and a toothed annulus 17. Behind the bore 12 the oil stream divides. One part flows, through a connection duct 13 in the cover plate, to a suction chamber 14 from where the suction tooth gaps 15 are charged on one side. The remaining oil flows, through a bore 18, and a connection duct 20, to another suction chamber 21 from where the suction tooth gaps 15 are charged on the other side. There the oil is conveyed to the delivery side.
  • connection ducts 25, 26 into collecting ducts 27, 28 of the gear plate 19 from where it flows through a bore 29 passing through the gear plate 19, the intermediate plate 32 and the housing 33 into a connection duct and to the delivery valve of the pump.
  • the cover plate 31 supports the pump shaft 34; it also contains the oil ducts 11, 12, 13, 14, 24 and 25.
  • the intermediate plate 32 are provided the chambers 20, 21, 23 and 25.
  • a hydraulic pump comprising, a casing, a horizontally extending shaft rotatably supported by said casing, pumping means attached to said shaft, a plate member attached to said casing adjacent said pumping means, a cap member attached to said plate member on the opposite side thereof from said pumping means, said cap member forming an inlet chamber having a centrally disposed portion and a plurality of radially extending duct portions, each of said duct portions having an inlet port at its radial extremity, a suction passage formed in said plate member providing fluid communication between said inlet chamber and said pumping means, said suction passage extending tangentially relative to the periphery of said centrally disposed portion of said inlet chamber.
  • a hydraulic pump according to claim 1 characterized by said duct portions extending radially outwardly and being symmetrically arranged.
  • a hydraulic pump according to claim 1 characterized by there being at least three of said duct portions.
  • a hydraulic pump according to claim 1 characterized by the plane of each of said inlet ports being at an angle of approximately 45 relative to the longitudinal axis of the pump.
  • a hydraulic pump according to claim 1 characterized by fluid inlet passages on opposite sides of said pumping means for admitting a fluid to both sides of said pumping means, said fluid inlet passages being in fluid communication with said suction passage.
  • a hydraulic pump according to claim 5 characterized by fluid outlet passages on opposite sides of said pumping means for receiving fluid discharged from both sides of said pumping means.
  • a hydraulic pump according to claim 1 characterized by said cap member having the form of a shell-like gap, and means for attaching said cap to said plate mem- -8.
  • a hydraulic pump according to claim 6 characterized by said plate member having the form of a cover plate, said shaft having one end thereof rotatably supported in said cover plate, and said cover plate having a portion of said fluid inlet and outlet passages formed therein.
  • a hydraulic pump according to claim 8 characterized by a side plate adjacent said pumping means on the opposite side thereof from said plate member, said side plate having a portion of said inlet and outlet passages formed therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US686391A 1966-11-29 1967-11-27 Hydraulic fuel oil pump or the like Expired - Lifetime US3491697A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0051674 1966-11-29

Publications (1)

Publication Number Publication Date
US3491697A true US3491697A (en) 1970-01-27

Family

ID=7053560

Family Applications (1)

Application Number Title Priority Date Filing Date
US686391A Expired - Lifetime US3491697A (en) 1966-11-29 1967-11-27 Hydraulic fuel oil pump or the like

Country Status (9)

Country Link
US (1) US3491697A (da)
BE (1) BE707104A (da)
CH (1) CH478989A (da)
DE (1) DE1553008C3 (da)
DK (1) DK132096C (da)
ES (1) ES347716A1 (da)
GB (1) GB1180254A (da)
NL (1) NL6716121A (da)
SE (1) SE337079B (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5713726A (en) * 1995-07-31 1998-02-03 Aisin Seiki Kabushiki Kaisha Pump apparatus
ITUB20153739A1 (it) * 2015-09-18 2017-03-18 Fluid O Tech Srl Pompa provvista di un sistema di compensazione della pressione interna.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635801B4 (de) * 1996-09-04 2005-04-28 Zahnradfabrik Friedrichshafen Hochdruckpumpe mit Arbeitsschiebern

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751847A (en) * 1952-02-28 1956-06-26 Sundstrand Machine Tool Co Fuel pump
US2775206A (en) * 1955-03-07 1956-12-25 Eaton Mfg Co Pump
US2966118A (en) * 1956-10-08 1960-12-27 Webster Electric Co Inc Fuel unit
US3162129A (en) * 1962-07-13 1964-12-22 Sundstrand Corp Two-stage fuel unit
US3312177A (en) * 1965-02-05 1967-04-04 Eckerle Fuel pump arrangement for an oil burner
US3343494A (en) * 1966-09-12 1967-09-26 Sundstrand Corp Automatically reversible gear pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751847A (en) * 1952-02-28 1956-06-26 Sundstrand Machine Tool Co Fuel pump
US2775206A (en) * 1955-03-07 1956-12-25 Eaton Mfg Co Pump
US2966118A (en) * 1956-10-08 1960-12-27 Webster Electric Co Inc Fuel unit
US3162129A (en) * 1962-07-13 1964-12-22 Sundstrand Corp Two-stage fuel unit
US3312177A (en) * 1965-02-05 1967-04-04 Eckerle Fuel pump arrangement for an oil burner
US3343494A (en) * 1966-09-12 1967-09-26 Sundstrand Corp Automatically reversible gear pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5713726A (en) * 1995-07-31 1998-02-03 Aisin Seiki Kabushiki Kaisha Pump apparatus
ITUB20153739A1 (it) * 2015-09-18 2017-03-18 Fluid O Tech Srl Pompa provvista di un sistema di compensazione della pressione interna.
EP3144531A1 (en) * 2015-09-18 2017-03-22 Fluid-O-Tech S.r.l. Pump provided with a system for compensating the internal pressure
US10113547B2 (en) 2015-09-18 2018-10-30 Fluid-O-Tech S.R.L. Pump provided with a system for compensating the internal pressure

Also Published As

Publication number Publication date
GB1180254A (en) 1970-02-04
DE1553008B2 (de) 1974-04-11
DK132096B (da) 1975-10-20
ES347716A1 (es) 1969-02-16
NL6716121A (da) 1968-05-30
DE1553008A1 (de) 1969-07-31
BE707104A (da) 1968-04-01
CH478989A (de) 1969-09-30
DK132096C (da) 1976-03-15
SE337079B (da) 1971-07-26
DE1553008C3 (de) 1974-11-14

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