US3558247A - Method and device for adjusting the lateral clearance in a rotary displacement pump - Google Patents

Method and device for adjusting the lateral clearance in a rotary displacement pump Download PDF

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Publication number
US3558247A
US3558247A US778114A US3558247DA US3558247A US 3558247 A US3558247 A US 3558247A US 778114 A US778114 A US 778114A US 3558247D A US3558247D A US 3558247DA US 3558247 A US3558247 A US 3558247A
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United States
Prior art keywords
pump
pressure
housing
wall member
face
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Expired - Lifetime
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US778114A
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English (en)
Inventor
Berthold Gaertner
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Bronzavia SA
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Bronzavia SA
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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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • Rotary displacement pump having at least one rotary element.
  • Two side-wall members are disposed in the pump housing on each side of the rotary element. At least one of the side-wall members is axially movable relative to the housing and to the rotary element.
  • One face of the movable side-wall member is subjected on at least a part of its face, to a pressure in the neighbourhood of the delivery pressure of the pump and means apply on at least a part of the other face of the movable side-wall member a regulated back-pressure whose magnitude determines the magnitude of the lateral clearance between the rotary element and the side-wall members.
  • the present invention relates to rotary displacement pumps and concerns in particular the adjustment of the lateral clearance of the rotating parts of such pumps.
  • the invention provides a method for regulating the lateral clearance in a displacement pump comprising -a housing in which a rotary element is mounted to rotate about an axis, wherein said rotary element is mounted between two side-wall members disposed in said housing, at least one of said side-wall members being axially movable relative to said housing and to said rotating element, there being established on at least a part of the face of said movable side-wall member facing said rotary element a pressure in the neighborhood of the delivery pres sure of the pump and on at least a part of the opposite face of said movable side-wall member a back-pressure whose magnitude determines the magnitude of the lateral clearance between the rotary element and said side-wall members.
  • the invention also provides a rotary displacement pump having a housing in which at least one rotary element is rotatably mounted, said pump comprising two sidewall members disposed in said housing and between which said rotary element is mounted, at least one'of said sidewall members being axially movable relative to said housing and relative to said rotary element, the face of the movable side-wall member being subjected on at least a part of its area to a pressure in the neighborhood of the delivery pressure of the pump, means being provided for applying on at least a part of the other face of said movable side-wall member a regulatedv back-pressure whose magnitude determines the value of the lateral clearance between saidrotary element and said side-wall members.
  • FIG. 1 is a partial longitudinal sectional view, with parts cut away, of a gear pump comprising a device according to the invention regulating the lateral clearance;
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, and
  • FIG. 3 is'a partial longitudinal sectional view, on an enlarged scale, of a modification of the invention.
  • a rotary displacement pump according to the invention will first be described with reference to FIGS. 1 and 2, this pump being a gear pump.
  • Such a pump comprises a housing 1 in two parts 1a, 1b interconnected by any suitable means (not shown).
  • the part 1a of said housing is provided with pipes 2, 3, nameiy the inlet and outlet pipes and two identical stepped bores 4 having axes X X and Xz-Xg.
  • the part 1b ly the inlet and outlet pipes and two identical stepped bores 5 having the same axes X -X X X as the bores 4.
  • the side-wall member 6 is stepped and defines with the bore 4 and the ring 7 annular chambers C1, C2, C3.
  • the lateral annular faces of the side-wall members 6 which partially define the chambers C1, C2, C3, will be respectively designated by the reference characters S1, S2, S3.
  • the chamber C3 communicates, by way of a small-diameter nozzle 11 constituting a jet, with the inner chamber or cavity 12 of the side-wall member 6 connected to the inlet of the pump.
  • this side-wall member 6 comprises on its outer face S opposed to the faces S1, S2, S3 grooves 13, 14, 15 of partly annular shape which are seen best in FIG. 2.
  • the groove 14 is connected by way of passages 16, 17 to the chambers C2, C3 respectively, the passage 17 communicating moreover with the chamber C2 by way of a passage 18.
  • the chamber C1 communicates with the outer face S of the side-wall member 4 by way of a passage 19.
  • the side-wall member 6 carries a bearing 20 and a sealing element 21 and that it is subject to the action of compression springs 22 which bear on one hand against the ring 7 and on the other hand against the bottom of cavities 23 in the face S3.
  • compression springs 22 which bear on one hand against the ring 7 and on the other hand against the bottom of cavities 23 in the face S3. The purpose of this spring will be explained in the course of the description of the operation of the device.
  • stepped bores 5 Disposed in the stepped bores 5 are identical fixed sidewall members 24 which comprise on their outer face grooves 25, 26, 27 which are identical to the grooves 14, 15, 16 and are located opposite the latter. These side-wall members 24 also carry bearings 28.
  • each gear pinion 30 comprises two series of longitudinal passages 31 and 32.
  • the passages 31 open onto the lateral faces of the pinion teeth in front of the grooves 14 and 26 of the corresponding side-wall members.
  • the passages 32 open onto the lateral faces of the gear pinion in front of the grooves 13 and 25 and are put into communication, by way of radial passages 33, with the roots of the teeth and consequently with the chambers defined by the gear pinions and the housing.
  • the grooves 15, 27 have such length that they are always in communication with at least one gap between two successive teeth.
  • the grooves 14, 26 are always in communication with a passage 31 and the grooves 13, 25 with a passage 32.
  • the device according to the invention operates in the following manner.
  • This pressure constitutes a regulated back-pressure of mean value P which is less than the delivery pressure P
  • the axial position of the side-wall member 6 is determined by the equilibrium between the pressure forces which are exerted on one face in one direction and the pressure forces P S +P (S +S exerted on the other faces and in the opposite direction.
  • a regulated backpressure P therefore corresponds to a value of the lateral clearance between the gear pinion and the side-wall members 6 and 24 and this back-pressure is mainly determined by the dimension of the nozzle 11.
  • the arrangement of the grooves 13 and 15 on each side of this groove 14 enables maintaining in the vicinity of the latter a pressure of constant magnitude equal to the delivery pressure.
  • the method and the device according to the invention regulate the value of the lateral clearance of the or each rotary element of a rotary displacement pump to a roughly constant minimum value and this improves and renders more regular the performances of such a pump without necessitating increased precision of the machining of the various parts.
  • FIG. 3 shows a modification of a pump according to the invention in which the nozzle 11 of fixed diameter is replaced by a device constituting a jet having regulable characteristics.
  • This device comprises a screw 34 having an axial conduit 35 constituting a jet and screwed in screwthreading 36 formed in a ring 37 whose shape slightly differs from that of the ring 9 of the embodiment shown in FIG. 1.
  • the screw 34 communicates by way of its end 34a with the chamber C3 in front of the solid centre part of a washer 38 provided with apertures 39.
  • This washer is disposed in an aperture 40 in the side-wall member 6 and applied against a stop ring 42 by a spring 41.
  • the characteristics of the jet thus constituted are determined by the clearance which exists between the end 34a of the screw 24 and the centre part of the washer 38.
  • the position of the screw 34 it is possible to regulate the lateral clearance between the gear pinion and the side-wall members 6 and 24, this regulation being for example carried out in the course of pump checking or acceptance tests.
  • the presence of the spring 41 allows the sidewall member to move a relatively great distance if a foreign body becomes lodged between the gear pinion and the facing faces of one or the other of the side-wall members.
  • the washer 38 abuts against the end 34a of the regulable jet and compresses the spring 41.
  • a rotary displacement pump comprising a housing defining a pumping chamber, an inlet and an outlet in said housing, two intermeshing gear pinions rotatably mounted in said housing; two pairs of side-wall members disposed in said housing and between which each of said gear pinions is rotatably mounted, one of said side-wall members of each pair being axially movable relative to said housing and relative to said gear pinion and defining with said housing at least one annular chamber, means for applying on a part of the face of said movable sidewall member facing said gear pinion a first pressure in the neighbourhood of the delivery pressure of the pump, a first arcuate groove defined in said face of each movable side-wall member substantially opposite the meshing area of the gear pinions, a first passage in said movable sidewall member putting on communication said first arcuate groove and said annular chamber, and fluid metering means between said annular chamber and a part of said housing where the pump inlet pressure is prevailing for applying in said annular chamber a regulated back-
  • each gear pinion has a shaft integral therewith and each side-wall member carries a bearing adapted to receive said shaft.
  • a pump as claimed in claim 1, wherein said metering means comprises at least one nozzle constituting a jet.
  • a pump as claimed in claim 1, comprising between a part of said housing and said movable side-wall member elastically yieldable means which biases said side-wall member against said gear pinion.
  • a rotary displacement pump comprising a housing, an inlet and an outlet in said housing, two interengaged pump gear pinions, four side-wall members mounted in said housing and cooperative in pairs with each of said gear pinions, each side-wall member including a bearing and each gear pinion being rotatably mounted in said bearings between the corresponding pair of side-wall members, one of said side-wall members of each pair being axially movable relative to said housing and to the corresponding gear pinion and the other of said side-wall members of each pair being fixed with respect to the housing, means for subjecting a part of the face of said movable side-Wall member of each pair which faces the adjacent gear pinion to a first pressure in the neighbourhood of the delivery pressure of the pump, first arcuate grooves in said part of said face of each movable side wall member and in the corresponding part of each fixed side-wall member, said grooves being identical and in facing relationship, each gear pinion comprising a first series of passageways opening onto the lateral faces thereof and in front of said first groove
  • each sidewall member comprises a third arcuate groove located adjacent and radially outside said first arcuate groove, said third arcuate grooves having such a circumferential length that they are always in communication with at least one gap between two successive teeth of the adjacent pinion.
  • each pair of side-wall members comprises on its face facing the adjacent pinion a first arcuate groove identical to the first arcuate groove of the movable side-wall member and opposite the latter, each gear pinion comprising a first series of passageways opening onto the lateral faces thereof in front of said first arcuate grooves.
  • each side-wall member comprises in its face facing the adjacent pinion a second arcuate groove located adjacent and radially inside said first arcuate grooves, each pinion comprising a second series of passageways opening onto the lateral faces thereof in front of said second arcuate grooves the circumferential length of which is at least equal to that of the arc between two successive passageways of said second series.
  • each side-wall member comprises a third arcuate groove located adjacent and radially outside said first arcuate groove, said third arcuate grooves having such a circumferential length that they are always in communication with at least one gap between two successive teeth of the adjacent pinion.

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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)
US778114A 1967-11-28 1968-11-22 Method and device for adjusting the lateral clearance in a rotary displacement pump Expired - Lifetime US3558247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR129912 1967-11-28

Publications (1)

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US3558247A true US3558247A (en) 1971-01-26

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US778114A Expired - Lifetime US3558247A (en) 1967-11-28 1968-11-22 Method and device for adjusting the lateral clearance in a rotary displacement pump

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US (1) US3558247A (en:Method)
DE (1) DE1810868A1 (en:Method)
FR (1) FR1553040A (en:Method)
GB (1) GB1246307A (en:Method)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752608A (en) * 1970-11-28 1973-08-14 Lucas Industries Ltd Bearing for pumps
US4231726A (en) * 1978-06-22 1980-11-04 Caterpillar Tractor Co. Gear pump having fluid deaeration capability
US4344745A (en) * 1978-10-26 1982-08-17 Pierburg Luftfahrtgerate Union Gmbh Self-sealing gear pump with sealing pressure divider
US4358258A (en) * 1979-07-06 1982-11-09 Fluid Energy Systems Corporation High pressure gear pump or motor with axial retaining means and radial balancing means
US4370110A (en) * 1979-07-06 1983-01-25 Fluid Energy Systems Corporation High pressure gear pump or motor with axial retaining means in a housing cavity
EP0169307A3 (en) * 1984-05-18 1987-01-07 Nordson Corporation Hot melt adhesive pump with ported gears
RU2205285C2 (ru) * 2001-03-20 2003-05-27 Нарижный Александр Афанасьевич Двигатель внутреннего сгорания и устройство подготовки топливной смеси
US20230175503A1 (en) * 2021-12-03 2023-06-08 Hamilton Sundstrand Corporation Spring retainer for gear pump bearing plate

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752608A (en) * 1970-11-28 1973-08-14 Lucas Industries Ltd Bearing for pumps
US4231726A (en) * 1978-06-22 1980-11-04 Caterpillar Tractor Co. Gear pump having fluid deaeration capability
US4344745A (en) * 1978-10-26 1982-08-17 Pierburg Luftfahrtgerate Union Gmbh Self-sealing gear pump with sealing pressure divider
US4358258A (en) * 1979-07-06 1982-11-09 Fluid Energy Systems Corporation High pressure gear pump or motor with axial retaining means and radial balancing means
US4370110A (en) * 1979-07-06 1983-01-25 Fluid Energy Systems Corporation High pressure gear pump or motor with axial retaining means in a housing cavity
EP0169307A3 (en) * 1984-05-18 1987-01-07 Nordson Corporation Hot melt adhesive pump with ported gears
RU2205285C2 (ru) * 2001-03-20 2003-05-27 Нарижный Александр Афанасьевич Двигатель внутреннего сгорания и устройство подготовки топливной смеси
US20230175503A1 (en) * 2021-12-03 2023-06-08 Hamilton Sundstrand Corporation Spring retainer for gear pump bearing plate
US11988209B2 (en) * 2021-12-03 2024-05-21 Hamilton Sundstrand Corporation Spring retainer for gear pump bearing plate
US20240301878A1 (en) * 2021-12-03 2024-09-12 Hamilton Sundstrand Corporation Spring retainer for gear pump bearing plate

Also Published As

Publication number Publication date
FR1553040A (en:Method) 1969-01-10
GB1246307A (en) 1971-09-15
DE1810868A1 (de) 1969-08-21

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