US3876349A - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
US3876349A
US3876349A US389584A US38958473A US3876349A US 3876349 A US3876349 A US 3876349A US 389584 A US389584 A US 389584A US 38958473 A US38958473 A US 38958473A US 3876349 A US3876349 A US 3876349A
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US
United States
Prior art keywords
gear
pump
wall
walls
wheel
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
US389584A
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English (en)
Inventor
Sven Hilding Svensson
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.)
Alfa Laval AB
Original Assignee
Alfa Laval AB
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 Alfa Laval AB filed Critical Alfa Laval AB
Application granted granted Critical
Publication of US3876349A publication Critical patent/US3876349A/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/005—Removing contaminants, deposits or scale from the pump; Cleaning
    • 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
    • F04C2/101—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 with a crescent-shaped filler element, located between the inner and outer intermeshing members

Definitions

  • the present invention relates to a gear pump comprising a pump housing having a pump chamber provided with fluid inlet and outlet means, and two gear wheels rotatable around parallel axes within said pump chamber, said gear wheels being adapted during normal operation of the pump to sealingly engage the walls of the pump housing and having intermeshing teeth or similar elements.
  • Pumps of this kind are used, for example, when a vis cous fluid is to be conveyed through a conduit, as in ice-cream or margarine producing plants.
  • gear pumps have a relatively small capacity which, without special arrangements, makes it impossible to flush cleaning liquid through the plant at a sufficient rate to obtain an efficient cleaning thereof.
  • the principal object of the present invention is to eliminate the above-noted problem and to provide a gear pump arrangement which in a simple way enables plants comprising gear pumps to be cleaned efficiently.
  • the invention is characterized by a device which is adapted, independently of a pressure in the pump chamber exceeding the normal operating pressure, to provide for an axial relative displacement of at least one of the gear wheels and one of the walls of the pump chamber, whereby the sealing engagement between these members displaced in relation to each other is interrupted and a free passage is established through the pump chamber, said passage permitting a generally free flow of fluid through the pump chamber between its inlet and outlet.
  • the arrangement for sealing between the portions of the pump housing can be designed in different ways within the scope of the invention.
  • the pump housing portions are preferably so designed that one of them sealingly surrounds the other one, whereby ordinary sealing rings can be used.
  • the invention is applicable to different types of gear pumps and is based on the idea of creating a leakage past the gear wheels within the walls of the pump housing when cleaning is to be carried out, such leakage being prevented during the normal operation of the pump.
  • gear pumps of a first type in which both gear wheels have radially outwardly directed teeth
  • gear pumps of a second type having a big gear wheel in the form of a rim having radially inwardly directed teeth, a small gear wheel eccentrically disposed therein and having radially outwardly directed teeth, and a stationary member having a cross-section in the shape of a sickle and filling out the space within the big gear wheel not occupied by the small gear wheel.
  • the stationary member and one of the gear wheels are preferably axially fixed in relation to one of the portions of the pump housing, and the other gear wheel is axially fixed relative to the other portion of the pump housing.
  • the gear pump is provided with means for restricting the relative movement of the portions of the pump housing, whereby the teeth of the gear wheels remain intermeshing. In this way, both gear wheels can be kept rotating during a cleaning operation and can thus be cleaned efficiently, even when only one of the gear wheels is connected to a driving shaft, as is usually the case.
  • the gear wheel which is not driven is rotatably supported and axially fixed to a journal which is rigidly connected to the portion of the pump housing supporting said stationary member.
  • FIGS. 1 and 2 are longitudinal, sectional views of a gear pump in accordance with the invention.
  • FIG. 3 is a cross-section taken along line llllll in FIG. 1.
  • the gear pump shown in the drawing has a pump housing comprising a body 1, a cylindrical member 2 connected to the body, and a wall 3 axially slidable within the cylindrical member.
  • the slidable wall 3 engages the body I along a step 4 and together with the body defines a pump chamber 5.
  • Sealing rings 6 are provided between the slidable wall 3 and the cylindrical member 2 of the pump housing.
  • the pump chamber 5 which has an inlet 7 and an outlet 8
  • the big gear wheel 9 has the shape of a toothed rim having radially inwardly directed teeth 11, the spaces between the teeth also opening radially outwards.
  • the small gear wheel 10 which is disposed within the big gear wheel 9, has the form of an ordinary gear wheel, the teeth 12 of which mesh with the inwardly directed teeth of the big gear wheel 9 along a portion of its periphery.
  • the small gear wheel is thus eccentrically oriented with relation to the big gear wheel.
  • a stationary member 13 having a cross-section in the form of a sickle.
  • This member 13 is formed by a protrusion of the slidable wall 3, said wall also having a journal 14 on which the small gear wheel 10 is rotatably supported.
  • the small gear wheel 10 is axially fixed relative to said journal 14 by means of a bolt 15.
  • the big gear wheel 9 is supported by a shaft 16 which extends out of the pump housing and is connected to a drive means (not shown).
  • a sealing ring 17 is provided between the shaft and the pump housing.
  • the big gear wheel 9 has a number of generally axially extending passages in the form of circumferentially spaced, inclined borings 90, one of which is shown in FIGS. 1 and 2, and another passage in the form of a recess la is provided in the pump housing, as shown in FIGS. 1-3.
  • the function of these passages is to enable the space between the big gear wheel 9 and the adjacent end wall of the pump chamber to be cleaned efficiently, as will be described later.
  • a fluid flows from the inlet 7 into the spaces between the teeth of the big gear wheel 9 and the small gear wheel 10 when these spaces are passing the inlet.
  • the slidable wall 3 has a recess 18 in front ofthe inlet 7, as can be seen in FIG. 1.
  • the fluid is then transported by the gear wheels to the area in front of the outlet 8 where it is pressed out of the spaces between the teeth and further through the outlet 8, owing to the fact that the teeth of the two gear wheels intermesh again in this area.
  • the slid able wall 3 has a recess (not shown) even at the outlet 8.
  • the big gear wheel 9 seals against the portion 1 of the pump housing circumferentially of its non-toothed portion, and the small gear wheel 10 seals against the slidable wall 3.
  • an end wall 19 At the end of the cylindrical portion 2 of the pump housing, there is an end wall 19. A number of bolts 20 extend through this end wall and further throughout the entire pump housing, said bolts holding together the different portions of the pump housing.
  • a partition wall 21 which, together with the slidable wall 3. defines a chamber 22 in the cylindrical portion 2 of the pump housing.
  • a spindle 23 connected to the slidable wall 3 extends through the fixed partition wall 2], said spindle supporting, on the opposite side of the fixed partition wall, a second slidable wall 24 which is slidable in the cylindrical portion 2 of the pump housing.
  • the wall 24 is attached to the spindle 23 by means of a nut 25.
  • Sealing rings 26 and 27 are provided between the slidable wall 24 and the cylindrical portion 2 ofthe pump housing. and also between the spindle 23 and the fixed partition wall 21, whereby a sealed chamber 28 is formed between the slidable wall 24 and the fixed partition wall 21.
  • the two sealed chambers 22 and 28 thus formed in the cylindrical portion 2 of the pump housing are adapted to be connected alternately to a pressure source (not shown), whereby the spindle 23 with the slidable walls 3 and 24 can be adjusted to the desired end position.
  • Connection means to the pressure source are shown at 29 and 30.
  • a guide bar 31 having a square cross section extends from said second slidable wall 24 and out through the end wall 19 of the pump housing.
  • the rightward movement of the slidable walls 3 and 24 is restricted by the nut and the end wall 19 of the cylindrical portion of the pump housing.
  • the portions incorporated in the gear pump have such dimensions that the small gear wheel 10, which moves axially with the slidable wall 3 of the pump housing, will not be slid out of engagement with the big gear wheel 9 when the wall 3 of the pump housing is moved to its extreme right-hand position.
  • gear wheels can thus be kept rotating irrespective of the position of the slidable walls 3 and 24.
  • a large amount of liquid for example, cleaning solution
  • the liquid passes from the inlet 7 radially inward through the gaps between the teeth of the big gear wheel 9 and then radially outward through said gaps in front of the outlet 8.
  • Liquid is also caused to flow through the openings 9a of the big gear wheel 9, in a leftward direction in FIG. 2, into the space between the big gear wheel 9 and the left end wall of the pump chamber and is discharged therefrom through the recess 10 in the pump housing, whereby this space is cleaned also.
  • the flow of the liquid through these passages is ensured by the centrifugal force acting on the liquid in the inclined openings during the rotation of the big gear wheel 9.
  • a gear pump comprising a housing having walls forming a pump chamber, said chamber having an inlet and an outlet, first and second gear wheels rotatable about parallel axes within said chamber, said gear wheels having intermeshing elements and being adapted during normal operation of the pump to sealingly engage adjacent walls of the pump chamber, one of said first gear wheel and a first said wall being mounted for axial displacement relative to the other of said first wheel and first wall, whereby the sealing engagement between said first wheel and first wall is interrupted, and a device operable independently of an above-normal pressure in the pump chamber to effect said displacement and thereby establish a free passage through the pump chamber, said passage permitting a generally free flow of fluid through the pump chamber between its inlet and outlet.
  • each of said gear wheels is axially fixed relative to one of said first and second walls.
  • the gear pump of claim 3 comprising also means for restricting relative movement of said first and second walls to maintain intermeshing of the gear wheels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US389584A 1972-08-18 1973-08-20 Gear pump Expired - Lifetime US3876349A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE10757/72A SE366094B (de) 1972-08-18 1972-08-18

Publications (1)

Publication Number Publication Date
US3876349A true US3876349A (en) 1975-04-08

Family

ID=20292801

Family Applications (1)

Application Number Title Priority Date Filing Date
US389584A Expired - Lifetime US3876349A (en) 1972-08-18 1973-08-20 Gear pump

Country Status (9)

Country Link
US (1) US3876349A (de)
JP (1) JPS5534318B2 (de)
CA (1) CA993724A (de)
DE (1) DE2339954C2 (de)
DK (1) DK133709B (de)
FR (1) FR2196677A5 (de)
GB (1) GB1408332A (de)
IT (1) IT992955B (de)
SE (1) SE366094B (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073605A (en) * 1976-09-15 1978-02-14 Crepaco, Inc. Rotary pump construction with cleaning feature
US4084926A (en) * 1976-02-25 1978-04-18 Brodrene Gram A/S Rotary gear pump
US5120206A (en) * 1991-04-08 1992-06-09 Bridgestone/Firestone, Inc. Gear metering pump for compounded elastomeric material
US5180297A (en) * 1991-03-22 1993-01-19 The Gorman-Rupp Company Fluid transfer pump with shaft seal structure
US5197869A (en) * 1991-03-22 1993-03-30 The Gorman-Rupp Company Rotary gear transfer pump having pressure balancing lubrication, bearing and mounting means
US6672850B2 (en) 2001-12-21 2004-01-06 Visteon Global Technologies, Inc. Torque control oil pump with low parasitic loss and rapid pressure transient response
US20060292024A1 (en) * 2005-06-23 2006-12-28 Hitomi Miyake Internal gear pump in combustion engine
EP1828607A1 (de) * 2004-12-22 2007-09-05 Magna Powertrain Inc. Gerotorpumpe mit veränderlichem fördervolumen
US20190003478A1 (en) * 2015-07-06 2019-01-03 Tetra Laval Holdings & Finance S.A. Self adjusting pump for ice cream freezer
EP3453879A1 (de) * 2017-09-06 2019-03-13 Tetra Laval Holdings & Finance S.A. Lebensmittelproduktpumpe mit laufrad und sternrad
EP4379211A1 (de) * 2022-11-29 2024-06-05 Tetra Laval Holdings & Finance S.A. Einstellbare pumpe zum pumpen eines flüssigen lebensmittelprodukts

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57204484U (de) * 1981-06-22 1982-12-25
JPS5962653U (ja) * 1983-02-14 1984-04-24 株式会社デンソー 電磁装置
IT1285662B1 (it) * 1996-04-04 1998-06-18 Catta 27 S R L Pompa idraulica, in particolare del tipo a lobi, con predisposizioni per il lavaggio automatico interno e con spie di malfunzionamento,
CZ2017330A3 (cs) * 2017-06-08 2018-11-21 Emil Brabec Pístové čerpadlo pro kapaliny, zvláště pro viskóznější a pastovitá média

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1672257A (en) * 1926-08-23 1928-06-05 Creamery Package Mfg Co Rotary pump
US2481560A (en) * 1947-05-31 1949-09-13 Viking Pump Company Sanitary pump
US3443522A (en) * 1967-07-10 1969-05-13 Werner Schindler Positive-displacement pump

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE414295C (de) * 1923-07-14 1925-05-28 Harry Clarence Phillips Einrichtung zur Leistungsaenderung von Drehkolbenmaschinen
US1990750A (en) * 1931-03-02 1935-02-12 Gulf Res & Dev Corp Variable volume pump and hydraulic transmission
CH216223A (de) * 1940-03-30 1941-08-15 Truninger Paul Drehkolbenmaschine.
CH243665A (de) * 1940-10-24 1946-07-31 Bross Erich Zahnradvorrichtung mit variablem Durchfluss eines flüssigen Arbeitsmittels.
DE1076496B (de) * 1956-09-25 1960-02-25 Zahnradfabrik Friedrichshafen Regelbare Drehkolbenmaschine mit zwei exzentrisch ineinander gelagerten, im Inneneingriff rotierenden Zahnraedern
US2979036A (en) * 1958-05-09 1961-04-11 Sven A Noren Hydraulic rotary engine
CH389437A (de) * 1961-09-01 1965-03-15 Aeratom Ag Verfahren und Abfülleinrichtung zur sterilen Abfüllung von Flüssigkeiten in Behälter
US3224198A (en) * 1964-12-23 1965-12-21 Schimkat Gerhard Franz Hydrostatic machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1672257A (en) * 1926-08-23 1928-06-05 Creamery Package Mfg Co Rotary pump
US2481560A (en) * 1947-05-31 1949-09-13 Viking Pump Company Sanitary pump
US3443522A (en) * 1967-07-10 1969-05-13 Werner Schindler Positive-displacement pump

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084926A (en) * 1976-02-25 1978-04-18 Brodrene Gram A/S Rotary gear pump
US4073605A (en) * 1976-09-15 1978-02-14 Crepaco, Inc. Rotary pump construction with cleaning feature
JPS5336008A (en) * 1976-09-15 1978-04-04 Crepaco Pump structure
JPS6011236B2 (ja) * 1976-09-15 1985-03-23 クレパコ・インコ−ポレイテツド ポンプ構造
US5180297A (en) * 1991-03-22 1993-01-19 The Gorman-Rupp Company Fluid transfer pump with shaft seal structure
US5197869A (en) * 1991-03-22 1993-03-30 The Gorman-Rupp Company Rotary gear transfer pump having pressure balancing lubrication, bearing and mounting means
US5120206A (en) * 1991-04-08 1992-06-09 Bridgestone/Firestone, Inc. Gear metering pump for compounded elastomeric material
US6672850B2 (en) 2001-12-21 2004-01-06 Visteon Global Technologies, Inc. Torque control oil pump with low parasitic loss and rapid pressure transient response
EP1828607A4 (de) * 2004-12-22 2012-12-19 Magna Powertrain Usa Inc Gerotorpumpe mit veränderlichem fördervolumen
EP1828607A1 (de) * 2004-12-22 2007-09-05 Magna Powertrain Inc. Gerotorpumpe mit veränderlichem fördervolumen
US7559754B2 (en) * 2005-06-23 2009-07-14 Kawasaki Jukogyo Kabushiki Kaisha Internal gear pump in combustion engine
US20060292024A1 (en) * 2005-06-23 2006-12-28 Hitomi Miyake Internal gear pump in combustion engine
US20190003478A1 (en) * 2015-07-06 2019-01-03 Tetra Laval Holdings & Finance S.A. Self adjusting pump for ice cream freezer
US10876528B2 (en) * 2015-07-06 2020-12-29 Tetra Laval Holdings & Finance S.A. Self adjusting pump for ice cream freezer
EP3453879A1 (de) * 2017-09-06 2019-03-13 Tetra Laval Holdings & Finance S.A. Lebensmittelproduktpumpe mit laufrad und sternrad
WO2019048235A1 (en) * 2017-09-06 2019-03-14 Tetra Laval Holdings & Finance S.A. FOOD PUMP WITH TURBINE AND STAR WHEEL
CN111033042A (zh) * 2017-09-06 2020-04-17 利乐拉瓦尔集团及财务有限公司 带叶轮和星形轮的食品泵
US11326597B2 (en) 2017-09-06 2022-05-10 Tetra Laval Holdings & Finance S.A. Food product pump with impeller and star wheel
CN111033042B (zh) * 2017-09-06 2022-06-07 利乐拉瓦尔集团及财务有限公司 带叶轮和星形轮的食品泵
EP4379211A1 (de) * 2022-11-29 2024-06-05 Tetra Laval Holdings & Finance S.A. Einstellbare pumpe zum pumpen eines flüssigen lebensmittelprodukts
WO2024115366A1 (en) * 2022-11-29 2024-06-06 Tetra Laval Holdings & Finance S.A. Adjustable pump for pumping a liquid food product

Also Published As

Publication number Publication date
FR2196677A5 (de) 1974-03-15
JPS4992605A (de) 1974-09-04
DE2339954A1 (de) 1974-02-28
SE366094B (de) 1974-04-08
DK133709B (da) 1976-07-05
CA993724A (en) 1976-07-27
GB1408332A (en) 1975-10-01
DK133709C (de) 1976-11-22
JPS5534318B2 (de) 1980-09-05
IT992955B (it) 1975-09-30
DE2339954C2 (de) 1983-01-05

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