US3869223A - Pumping system - Google Patents

Pumping system Download PDF

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Publication number
US3869223A
US3869223A US330514A US33051473A US3869223A US 3869223 A US3869223 A US 3869223A US 330514 A US330514 A US 330514A US 33051473 A US33051473 A US 33051473A US 3869223 A US3869223 A US 3869223A
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US
United States
Prior art keywords
sleeve
bore
pumps
regulating
combination
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
US330514A
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English (en)
Inventor
Paul Bosch
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3869223A publication Critical patent/US3869223A/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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel

Definitions

  • a regulating unit regulates the outputs of the pumps at their outlets and includes a housing having two spaced pressure chambers each communieating with one of the outlets, a communicating bore which connects the chambers, a hollow regulating sleeve which is slidably accommodated in the bore and connected with the pumps so that as it slides it will regulate the operation of the same, and a piston located in the sleeve.
  • One axial annular end of the sleeve is exposed to the pressure of fluid in one of the chambers and an axial end face in the region of the other axial end of the sleeve is exposed to the pressure of fluid in the other of the chambers.
  • a spring biases the sleeve in one axial direction.
  • the present invention relates to a pumping system in general, and more particularly to a pumping system using two coupled pumps each of which supplies a separate user circuit.
  • the general object of the invention is to overcome the disadvantages of the prior art.
  • Another object of the invention is to provide, in such a pumping system, a regulating unit of the type under discussion which does not require that its constituent components be manufactured to precise tolerances.
  • one feature of the invention resides in a pumping system, in a combination which comprises a pair of pumps each having an outlet connected with a different user, and a regulating unit for regulating the output of the pumps.
  • the regulating unit comprises a housing having two spaced pressure chambers each communicating with one of the outlets, a connecting bore connecting the chambers, a hollow regulating sleeve slidably accommodated in this bore in operative association with the pumps for regulating the same and having one annular end face exposed to the pressure in one of the chambers, a piston extending into the sleeve inwardly of the other annular end face of the same and having an axial end face exposed to the pressure in the other of the chambers, and a spring biasing the sleeve in one axial direction of the same.
  • FIGURE is a partly sectional, partly diagrammatic view illustrating an embodiment of the invention.
  • reference numeral 10 identifies a housing of a regulating unit for the two pumps 24 and 27.
  • the housing is provided with a blind bore 11 in which a piston 12 is in part accommodated so that it has play, meaning that it can move transversely of its elongation and can also perform limited skewing movements.
  • the blind bore 11 merges into a housing bore 13 which is concentric with it and which in turn merges into a cylindrical chamber 14.
  • a hollow sleeve is provided with a second blind bore 15 and in part surrounds the piston 12, the sleeve being slidably axially thereon in sealing engagement with it.
  • Sleeve 15 has an enlarged portion 17 which extends into the cylindrical chamber 14 and defines at its juncture with the remainder of the sleeve a shoulder 17 which serves as an abutment determinative of the extent to which the sleeve 16 can move into the bore 13.
  • the cover 18 is provided on the housing 10, closing the same, and being abutted by the ends of two springs 19, 20 the opposite ends of which abut the enlarged portion 17 of the sleeve 16.
  • a pin, bolt or other member 21 is fast with the portion 17 and is embraced in a slot of a bifurcated lever 22 which is thus pivotable about it.
  • the lever 22 in turn is connected with an adjusting element 23 that is also connected with the pump 24, and in addition it is connected via a linkage 25 with an adjusting element 26 of the pump 27. This means that when the lever 23 moves, both of the pumps 24 and 27 will be adjusted in the same sense and to the same extent.
  • the two pumps are coupled with one another and are jointly driven by a drive 28, and the output of the pump 24 is connected with a user circuit 30 leading to a non-illustrated first user, whereas the output of the pump 27 is connected with a circuit 31 leading to a non-illustrated second user which is different and separate from the first user.
  • the housing is provided with a bore 33 which communicates via a conduit 32 with the user circuit 30 and which also communicates with the bore 13 adjacent the end of the same which merges into the blind bore 11.
  • a further bore in the housing 35 communicates with an annular space 36 surrounding the inner wall bounding the bore 13, adjacent the end which merges into the cylindrical chamber 14.
  • the bore 35 communicates via a conduit 34 with the user circuit 31.
  • the circumferential wall of the sleeve 16 is provided with a plurality of radial bores 37 located in the region of the inner end of the blind bore 15, and in addition with further radial bores 38 of substantially smaller diameter than that of the bores 37 and which are located in one or several transverse planes of the sleeve 16.
  • the sealing ring 39 is provided on the end portion of the piston 12 which is located in the blind bore 11 and the latter is connected via a bore 40 with a reservoir 41.
  • Reference numeral 42 designates a fluid reservoir from which fluid is drawn by the suction side of the two pumps 24 and 27.
  • the axial annular end face F1 on the sleeve 16 and the circular axial end face F2 corresponding to the diameter of the piston 12, are proportional to the throughput capacities of the pump 24 and 27, respectively.
  • the pumps 24 and 27 are driven at the identical speed by the drive 28 because they are mechanically coupled for this purpose.
  • the members 23 and 26 will originally assume positions in which the pumps provide their maximum output into the user circuit. If subsequently the resistance to the fluid flow increases in one or both of the circuits 30, 31 (due to the operation of the associated user), then the resulting back pressure is communicated via the conduits 32, 34 into the pressure chambers 43, 44 of which the former communicates with the surface F1 and the latter with the surface F2.
  • This means that the sleeve 16 is subjected to the pressure of the fluid in the respective user circuits at two spaced locations.
  • the sleeve 16 is displaced axially counter to the force of the springs 19, and in so doing causes the lever 26 to move and via the same and the linkages associated with the lever to regulate the setting of the pumps by exactly the same amount by which it has been axially displaced.
  • the force acting upon the sleeve 16 is proportional to the sum of the outputs of the two pumps 24, 27.
  • the fluid pressure in the circuit 30 acts in the pressure chamber 43 and the fluid pressure in the user circuit 31 acts via conduit 34, bore 35 and annular groove 36 in the pressure chamber 34 which is located in the interior of the sleeve 16.
  • the construction be small, which includes, inter alia, that the springs 19, 20 be small.
  • the surfaces F1 and F2 must be relatively small, and this in turn permits the wall thickness of the sleeve 16 to be correspondingly thin.
  • the pressures acting at its interior and at its exterior at radially opposite locations must be identical, which is achieved by the fact that the sealing distances inside and outside are identical and by the radial bores 38 which permit pressure fluid leaking from the chambers 43 or 44 to escape.
  • a combination comprising a pair of pumps each having an outlet connectable with a different user; and a regulating unit for regulating the output of said pumps, comprising a housing having a first bore, a hollow regulating sleeve slidably accommodated in said first bore in operative association with said pumps for regulating the same and having one annular end face in part bounding a first pressure chamber, a piston accommodated in a second bore in said sleeve inwardly of the other annular end face of the same and having an axial end face in part bounding a second pressure chamber in said second bore, and a spring biasing said sleeve in one axial direction of the same, each of said pressure chambers communicating with a different one of said outlets.
  • said second bore being a blind bore concentric with said connecting bore, and said piston being located at least partly with play in said blind bore.
  • said abutment means comprises a shoulder provided on said sleeve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US330514A 1972-04-07 1973-02-08 Pumping system Expired - Lifetime US3869223A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2216680A DE2216680A1 (de) 1972-04-07 1972-04-07 Regelvorrichtung fuer zwei gekoppelte pumpen

Publications (1)

Publication Number Publication Date
US3869223A true US3869223A (en) 1975-03-04

Family

ID=5841221

Family Applications (1)

Application Number Title Priority Date Filing Date
US330514A Expired - Lifetime US3869223A (en) 1972-04-07 1973-02-08 Pumping system

Country Status (6)

Country Link
US (1) US3869223A (de)
JP (1) JPS498801A (de)
CH (1) CH549731A (de)
DE (1) DE2216680A1 (de)
FR (1) FR2179448A5 (de)
GB (1) GB1381827A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689955A (en) * 1983-06-11 1987-09-01 Case Vibromax Gmbh & Co Kg Vibration roller having a power limiting device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6324841B1 (en) 1996-10-31 2001-12-04 Brueninghaus Hydromatik Gmbh Power- and moment-regulating system for a plurality of hydraulic pumps
DE19646687C1 (de) * 1996-10-31 1998-02-12 Brueninghaus Hydromatik Gmbh Leistungs- bzw. Momentenregeleinrichtung für mehrere Hydropumpen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723026A (en) * 1970-04-22 1973-03-27 I Soyland Effect regulator for constant and variable volume-flow pumps

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723026A (en) * 1970-04-22 1973-03-27 I Soyland Effect regulator for constant and variable volume-flow pumps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689955A (en) * 1983-06-11 1987-09-01 Case Vibromax Gmbh & Co Kg Vibration roller having a power limiting device

Also Published As

Publication number Publication date
CH549731A (de) 1974-05-31
GB1381827A (en) 1975-01-29
FR2179448A5 (de) 1973-11-16
JPS498801A (de) 1974-01-25
DE2216680A1 (de) 1973-10-11

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