US3614267A - Two-stage fluid pump - Google Patents

Two-stage fluid pump Download PDF

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Publication number
US3614267A
US3614267A US873023A US3614267DA US3614267A US 3614267 A US3614267 A US 3614267A US 873023 A US873023 A US 873023A US 3614267D A US3614267D A US 3614267DA US 3614267 A US3614267 A US 3614267A
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US
United States
Prior art keywords
pump
pumping
chambers
race
gerotor
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
US873023A
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English (en)
Inventor
Eckart F Schultze
John R Schultz
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.)
Enerpac Tool Group Corp
Original Assignee
Applied Power Industries Inc
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 Applied Power Industries Inc filed Critical Applied Power Industries Inc
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Publication of US3614267A publication Critical patent/US3614267A/en
Anticipated expiration legal-status Critical
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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • 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
    • F04C2/10—Rotary-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
    • F04C2/102—Rotary-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 the two members rotating simultaneously around their respective axes

Definitions

  • the present invention provides a two-stage fluid pump having a Gerotor pump as the first stage pumping unit, and which Gerotor pump can act simultaneously with and supercharge a second pump of the radially arranged piston type.
  • a more specific object of the present invention relates to the use of individual piston blocks for each of the radial-type pistons, whereby an economically produced pump is provided. That is to say, the individual pump body can be fashioned from selected and ideal heat treated material and the critical machining required is only necessary on relatively small areas. Therefore, a very satisfactory pump body is provided for each of the individual pumping pistons and a minimum amount of machining is required to provide these accurately formed pump bodies. In addition, various pump bodies of different bores can be interchanged to permit changing of the capacity of the individual pumping units.
  • Another aspect of the present invention relates to a particularly compact and efficient two-stage pump, which is quiet in operation and in which the load is evenly distributed on the cam shaft due to the use of radially disposed pistons.
  • the present invention provides a two-stage fluid pump which is small and compact and has low pulsations, exceptionally well lubricated, quiet in operation, and economical to manufacture.
  • a quiet pump has been provided with good life, and one which can provide high-flow at low pressure.
  • FIG. I is a side elevational view of a portion of a two-stage pump embodying the present invention in which certain portions of the pump are shown as broken away and in section for clarity in the drawings;
  • FIG. 2 is a bottom view of the pump together with the unloading valve and relief valve, but on a reduced scale;
  • FIG. 3 is an elevational view, in section, of one of the piston blocks
  • FIG. 4 is another view of the piston block shown in FIG. 3, the view being taken generally along the line 4-4 in FIG. 3;
  • FIG. 5 is another view of the piston block taken generally along line 5-5 of FIG. 3;
  • FIG. 6 is a view of the race for the pistons, the view being taken generally along line 6-6 in FIG. I, but on a reduced scale;
  • FIG. 7 is a view of the plate shown in FIG. I, the view being taken generally along line 7--7 thereof;
  • FIG. 8 is a view of the Gerotor pumping units, the view being taken generally along the line 8-8 in FIG. 1;
  • FIG. 9 is a longitudinal cross-sectional view of the shaft assembly of the pump shown in FIG. I.
  • FIG. 10 is a flow diagram for the pump assembly.
  • the general arrangement of the present two-stage fluid pump includes a source of power, such as for example, an electric motor I having a drive shaft 2 to which is keyed or otherwise fixed the shaft 3. Shafts 2 and 3 form a drive shaft means which drive the Gerotor pump 4. The shaft means also furnishes the driving power to the radial piston pump 5.
  • the Gerotor pump 4 can provide pressurized fluid to the radial piston pump 5 via passages to be referred to, so as to supercharge the radial-piston-type pump.
  • An unloading valve 8 and a one-way check valve 9 are provided in the assembly and in this manner depending on the pressure setting of the valve 8, the Gerotor pump can ordinarily pump pressure fluid past the check valve 9 and into the delivery conduit 10 of the assembly, along with the discharge of the radial piston pump 5 from passage Ill.
  • the discharge from the Gerotor pump can be dumped via the unloading valve 8 when the pressure setting valve 8 is reduced, and under these circumstances, it is only the radial piston pump 5 that provides fluid pressure discharge.
  • the two pumps 4 and 5 can act in unison, or alternatively the pump 5 can act by itself, being fed by the Gerotor pump.
  • the assembly includes a pump housing H which is secured by cap screws 12 to the motor base, and a top housing 13 is secured by cap screws 14 to the housing H.
  • the tubular shaft 3 is joumaled on needle bearings I5 located in the top housing 13, and a suitable shaft seal I6 is located between the top housing 13 and the upper end of the shaft 3.
  • the top housing defines an outer rotor 20 having a pumping chamber 18, in which inner rotor 21 of the Gerotor pump is located.
  • the inner rotor 21 has one tooth less than the outer rotor, and is eccentric thereto, and is detachably connected to the shaft 3 by means of the ball 22 which is engaged in detents in the inner rotor 2I and on the periphery of the shaft 3.
  • the two rotors act as a positive displacement gear-type pump in the known manner, the inner rotor being driven by the shaft 3.
  • This pump may be of the type manufactured by W. H. Nichols Company of Waltham, Mass.
  • the pressure fluid from the Gerotor pump can be delivered via outlet 24 and conduit 24a (see FIGS. I, 2 and I0) directly to the discharge line 110.
  • pressure fluid from the Gerotor unit is discharged via passage means 23 to the annular groove 25 (FIG. I) in the housing H, from which it passes through ports 26 in the plate 27 and then via passageway 28 in the pump body B, past the check ball 29 and into the pumping chamber 30 of the piston pump 5.
  • a piston 3ll reciprocates within the bore 32 which forms the pumping chamber 30, to thereby provide suction and discharge strokes for each of the pistons.
  • the pistons are reciprocated by the action of the cam por tion 33 formed on the shaft 3 and more particularly, the race 34 (see FIG. 6) is journaled on needle bearings 36 around the shaft 3, and the inner, large end 37 of the pistons bear against the race 34.
  • the race 34 has a flat surface 40 on which one of the inner ends of the pistons rest. By having this flat surface on the race, the race remains stationary as the shaft 3 rotates.
  • a second set of needle bearings 42 is provided between the inner end of shaft 3 and the housing H.
  • the Gerotor pump provided insures that good lubrication is furnished to the needle bearings 42 via the passage 44 between the housing H and the shaft 3. Fluid leakage past this annular space 44 acts to lubricate the entire piston-type pump, which results in a particularly quiet and reliable pumping arrangement.
  • FIGS. 3, 4 and 5 which show a pump body 5 for each of the pistons 31, it will be seen that only a relatively small body is required for each of the pistons, thereby reducing the amount of machining required.
  • These bodies can be heat treated with particular nicety and to a fine degree of finish and can be readily repaired or replaced.
  • bodies of different sized pumping chambers can be provided for pistons of similar size so that pump capacity can be readily varied.
  • the discharge from the pump 5 is via passage 11 to the conduit lla where it communicates with conduit leading past relief valves RV.
  • a two-stage fluid pump comprising,
  • a positive displacement Gerotor pump having an outer rotor and an inner rotor drivingly connected to said shaft means a radially piston pump mounted on said Gerotor pump and having radially extending pumping chambers, said Gerotor pump having a fluid delivery communication with said pumping chambers for supercharging said piston pump,
  • said Gerotor pump also having a second fluid discharge outlet separate from said communication for separate discharge of pressure fluid from said pump
  • said piston pump having a plurality of replaceable and individual pump bodies defining said pumping chambers and including means for controlling fluid flow to and from said chambers,
  • said shaft means having an eccentric portion
  • a flat surface on the outer periphery of said race positioned to engage one of said pistons to prevent rotary motion of i said race, and a port plate connected to said pump bodies and defining a discharge passage from said chambers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US873023A 1969-10-31 1969-10-31 Two-stage fluid pump Expired - Lifetime US3614267A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87302369A 1969-10-31 1969-10-31

Publications (1)

Publication Number Publication Date
US3614267A true US3614267A (en) 1971-10-19

Family

ID=25360837

Family Applications (1)

Application Number Title Priority Date Filing Date
US873023A Expired - Lifetime US3614267A (en) 1969-10-31 1969-10-31 Two-stage fluid pump

Country Status (6)

Country Link
US (1) US3614267A (de)
DE (1) DE2053457C3 (de)
FR (1) FR2066802A5 (de)
GB (1) GB1301496A (de)
NL (1) NL7015442A (de)
SE (1) SE7014313L (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992131A (en) * 1975-03-17 1976-11-16 Owatonna Tool Company Low speed pump
US4105369A (en) * 1977-06-30 1978-08-08 Owatonna Tool Company Two-stage pump
US4475870A (en) * 1980-08-19 1984-10-09 Karl Eickmann Hydraulic arrangement
US4626177A (en) * 1980-08-19 1986-12-02 Karl Eickmann Hydraulic arrangement
US4854822A (en) * 1988-08-24 1989-08-08 Apollo Sprayers International, Inc. Series impeller air pump for liquid sprayer
WO1998014704A1 (de) * 1996-10-01 1998-04-09 Mannesmann Rexroth Ag Radialkolbenpumpe
GB2385387A (en) * 2001-11-21 2003-08-20 Denso Corp Fuel injection pump
US6957872B2 (en) * 2004-01-28 2005-10-25 Delphi Technologies, Inc. Integrated pre-charge for controlled brake systems
US20060210409A1 (en) * 2005-03-15 2006-09-21 Sumner William P Grease pump
US20140356195A1 (en) * 2013-06-03 2014-12-04 Honda Motor Co., Ltd. Oil suction device of vehicle
CN108223331A (zh) * 2018-01-06 2018-06-29 西南石油大学 一种有杆抽油泵与地面驱动螺杆泵组合式抽油系统

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518659B1 (fr) * 1981-12-23 1986-09-05 Maximov Anatoly Dispositif d'alimentation en materiaux composites visqueux
DE3301563A1 (de) * 1983-01-19 1984-07-26 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Tandempumpe
DE4327849C2 (de) * 1993-08-19 1996-07-11 Wap Reinigungssysteme Mehrkreis-Ringpumpe
CN104234966A (zh) * 2013-06-20 2014-12-24 扬州市宝元机械制造有限公司 液压泵

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1753562A (en) * 1927-06-20 1930-04-08 Oilgear Co Pump
US2254432A (en) * 1939-10-25 1941-09-02 Edgar M Lieberman Magnetic pump
US2271570A (en) * 1940-07-31 1942-02-03 Harvey S Pardee Pump
US2324291A (en) * 1942-06-15 1943-07-13 Hydraulie Controls Inc Pump
US2345125A (en) * 1942-10-09 1944-03-28 New York Air Brake Co High pressure pump
US2666395A (en) * 1949-12-21 1954-01-19 Worthington Corp Rotary pump adapted to be supported and actuated by a power take-off shaft of a motor
US2709339A (en) * 1953-07-06 1955-05-31 Pacific Airmotive Corp Two-stage pumping system with automatic demand responsive control
US2887061A (en) * 1954-07-01 1959-05-19 Westinghouse Electric Corp Totally enclosed canned motor pump
US3053186A (en) * 1959-06-24 1962-09-11 John T Gondek Two-stage hydraulic pumps
US3299854A (en) * 1965-05-03 1967-01-24 Sels Peter J Van Loben Applicator for liquids and semi-liquids

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1753562A (en) * 1927-06-20 1930-04-08 Oilgear Co Pump
US2254432A (en) * 1939-10-25 1941-09-02 Edgar M Lieberman Magnetic pump
US2271570A (en) * 1940-07-31 1942-02-03 Harvey S Pardee Pump
US2324291A (en) * 1942-06-15 1943-07-13 Hydraulie Controls Inc Pump
US2345125A (en) * 1942-10-09 1944-03-28 New York Air Brake Co High pressure pump
US2666395A (en) * 1949-12-21 1954-01-19 Worthington Corp Rotary pump adapted to be supported and actuated by a power take-off shaft of a motor
US2709339A (en) * 1953-07-06 1955-05-31 Pacific Airmotive Corp Two-stage pumping system with automatic demand responsive control
US2887061A (en) * 1954-07-01 1959-05-19 Westinghouse Electric Corp Totally enclosed canned motor pump
US3053186A (en) * 1959-06-24 1962-09-11 John T Gondek Two-stage hydraulic pumps
US3299854A (en) * 1965-05-03 1967-01-24 Sels Peter J Van Loben Applicator for liquids and semi-liquids

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992131A (en) * 1975-03-17 1976-11-16 Owatonna Tool Company Low speed pump
US4105369A (en) * 1977-06-30 1978-08-08 Owatonna Tool Company Two-stage pump
FR2396187A1 (fr) * 1977-06-30 1979-01-26 Owatonna Tool Co Pompe a deux etages
US4475870A (en) * 1980-08-19 1984-10-09 Karl Eickmann Hydraulic arrangement
US4626177A (en) * 1980-08-19 1986-12-02 Karl Eickmann Hydraulic arrangement
US4854822A (en) * 1988-08-24 1989-08-08 Apollo Sprayers International, Inc. Series impeller air pump for liquid sprayer
WO1998014704A1 (de) * 1996-10-01 1998-04-09 Mannesmann Rexroth Ag Radialkolbenpumpe
GB2385387A (en) * 2001-11-21 2003-08-20 Denso Corp Fuel injection pump
US6817838B2 (en) 2001-11-21 2004-11-16 Denso Corporation Fuel injection pump with a filter
GB2385387B (en) * 2001-11-21 2005-06-15 Denso Corp Fuel injection pump
US6957872B2 (en) * 2004-01-28 2005-10-25 Delphi Technologies, Inc. Integrated pre-charge for controlled brake systems
US20060210409A1 (en) * 2005-03-15 2006-09-21 Sumner William P Grease pump
US20140356195A1 (en) * 2013-06-03 2014-12-04 Honda Motor Co., Ltd. Oil suction device of vehicle
CN108223331A (zh) * 2018-01-06 2018-06-29 西南石油大学 一种有杆抽油泵与地面驱动螺杆泵组合式抽油系统
CN108223331B (zh) * 2018-01-06 2023-12-26 西南石油大学 一种有杆抽油泵与地面驱动螺杆泵组合式抽油系统

Also Published As

Publication number Publication date
DE2053457B2 (de) 1974-05-30
FR2066802A5 (de) 1971-08-06
DE2053457C3 (de) 1975-01-23
GB1301496A (de) 1972-12-29
SE7014313L (de) 1971-05-03
NL7015442A (de) 1971-05-04
DE2053457A1 (de) 1971-05-06

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