EP0242963A2 - Pompe volumétrique rotative - Google Patents

Pompe volumétrique rotative Download PDF

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Publication number
EP0242963A2
EP0242963A2 EP87302043A EP87302043A EP0242963A2 EP 0242963 A2 EP0242963 A2 EP 0242963A2 EP 87302043 A EP87302043 A EP 87302043A EP 87302043 A EP87302043 A EP 87302043A EP 0242963 A2 EP0242963 A2 EP 0242963A2
Authority
EP
European Patent Office
Prior art keywords
outlet ports
land
pumping chamber
pump
slot
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.)
Withdrawn
Application number
EP87302043A
Other languages
German (de)
English (en)
Other versions
EP0242963A3 (fr
Inventor
Ian Trevor Bristow
Alec Thornelow
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.)
Hobourn Eaton Ltd
Original Assignee
Hobourn Eaton Ltd
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 Hobourn Eaton Ltd filed Critical Hobourn Eaton Ltd
Publication of EP0242963A2 publication Critical patent/EP0242963A2/fr
Publication of EP0242963A3 publication Critical patent/EP0242963A3/fr
Withdrawn legal-status Critical Current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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Definitions

  • This invention relates to positive displacement rotary pumps and more particularly to pumps of the kinds known as gerotor or N(N+1) pumps and crescent pumps and which have a single ring of pumping chambers delivering pressure fluid to two separate outlet ports disposed one downstream of the other in the direction of rotation of the rotors.
  • a positive displacement rotary pump comprising a housing, an outer rotor mounted in the housing for rotation and having internal teeth or lobes, an inner rotor disposed within and eccentrically with respect to the outer rotor and having external teeth or lobes which mesh with the internal teeth or lobes of the outer rotor and form therewith sealed pumping chambers operating to pump fluid from an inlet port in the housing to two outlet ports in the housing which outlet ports are arranged one downstream of the other in the direction of rotation of the rotors, the housing providing land means for sealing the two outlet ports from each other, each of said outlet ports having, in at least the regions thereof bordering opposite sides of the land means, a portion extending radially inward beyond the radially inner extremity of a pumping chamber passing the land means, and the inner rotor having between each adjoining pair of its external teeth or lobes slot means opening to one or both of the axial end surfaces of the inner rotor and to the pumping chamber between said pair teeth or
  • said slot means has an effective circumferential extent greater than the effective circumferential extent of the land means such that during the movement of the associated pumping chamber past the land means the slot means serves to place the pumping chamber always in communication with said portion of one or other of said two outlet ports.
  • the slot means may be formed in the end face of the inner rotor facing said one of the end plates.
  • the slot means associated with each pumping chamber may comprise slots formed in both end faces of the inner rotor or may comprise slots extending through the full axial length of the inner rotor.
  • the circumferential edges defining the effective circumferential limits of the land means are provided by the two end plates respectively, the circumferential limits of the slot means may similarly be defined by slots opening to opposite end faces respectively of the inner rotor.
  • the pump is of the gerotor or N(N+1) type comprising an outer rotor 10 and an inner rotor 11 mounted for rotation in a housing 12 which includes also two end plates flanking opposite ends of the rotors.
  • the inner rotor is disposed eccentrically with respect to the outer rotor and is secured to the drive shaft 13 of the pump.
  • the outer rotor is formed internally with lobes 14 and the inner rotor is formed with complementary lobes 15 which mesh with the lobes 14 and form seals at the points of contact to define pumping chambers 16 carrying working fluid of the pump from an inlet port 18 in the axial end plate 17 to each of two outlet ports 19, 20 also formed in the end plate.
  • the positions of ports 17, 18 and 19 are shown superimposed in chain lines in Figure 1.
  • the number of lobes on the outer rotor exceeds that on the inner rotor by 1.
  • the two outlet ports are arranged one downstream of the other in the direction of rotation of the rotors and are isolated from each other in the end plate by a radially extending land 22 which is in sliding sealing engagement with the adjoining face of the inner rotor 11.
  • the contraction in volume also occurs during the time in which the pumping chamber is passing the land 22 and is occurring at substantially its maximum rate at this point, and since the land has a circumferential extent, over the radial dimension of the chamber, substantially equal to that of the pumping chamber, fluid being compressed in the pumping chamber during passage of the chamber past the land can escape only through the leading or trailing end portions of the pumping chamber to the outlet ports 19 or 20 respectively.
  • the two end portions of the pumping chamber are of very small area so that the ejection of fluid through these small area end portions causes noisy operation and a sharp rise in the fluid pressure in the pumping chamber. It is desirable to minimise this rise in pressure, for example in order to enable the outer diameter of the outer rotor to be kept to a minimum so that the weight of the rotor is minimised and so that the friction between the outer rotor and the housing is reduced.
  • the face of the inner rotor 11 adjoining the end plate is formed with a series of slots 24 extending radially inward from the bottom of the channels between the lobes 15.
  • the slots 24 have a circumferential width which is greater than the minimum width of the part of the land 22 axially aligned with the slots so that fluid from the pumping chamber can flow inward along the slot and thence into the outlet port 19 or 20.
  • the slots 24 may have a circumferential width equal to or even slightly less than the corresponding dimension of the land so that the clearance provides a leakage path for fluid from the slot during the instant of passage of the pumping chamber past the land.
  • the slots may conveniently be formed using a milling cutter so as when viewed in axial section to have the shape of a sector of a circle. However, the slots may if desired extend across the full axial width of the inner rotor. In cases where the other end plate has recesses opposite the two outlet ports and a land between these recesses, the slots 24 may extend across the full axial width of the inner rotor 11, or the rotor 11 may have slots 24 in both of its end faces. In cases where the two lands respectively provide the two cut-off points of communication between the two outlet ports, the circumferential edges of the slots at opposite axial ends of the inner rotor may be correspondingly disposed to provide the required extent of communication between the pumping chambers and the outlet ports and recesses.
  • circumferential end portions of the two outlet ports, and of the recesses where provided, which co-operate with the slots may be shaped by drilling holes 26 as illustrated in Figure 2.
  • the slots may be of any desired shape to produce the required control of rise of pressure in the pumping chambers.
  • the radially inner portions of the slots may be circumferentially wider than the outer portions so that the slots are somewhat T-shaped where the land has a large minimum circumferential extent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP87302043A 1986-03-14 1987-03-10 Pompe volumétrique rotative Withdrawn EP0242963A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8606326 1986-03-14
GB868606326A GB8606326D0 (en) 1986-03-14 1986-03-14 Positive displacement pumps

Publications (2)

Publication Number Publication Date
EP0242963A2 true EP0242963A2 (fr) 1987-10-28
EP0242963A3 EP0242963A3 (fr) 1988-03-09

Family

ID=10594598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87302043A Withdrawn EP0242963A3 (fr) 1986-03-14 1987-03-10 Pompe volumétrique rotative

Country Status (2)

Country Link
EP (1) EP0242963A3 (fr)
GB (1) GB8606326D0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207706A (en) * 1987-08-06 1989-02-08 Ushiji Negishi Rotary pump
GB2244097A (en) * 1987-08-03 1991-11-20 White Hollis Newcomb Jun Orbiting valve in gerotor device
GB2396385A (en) * 2002-11-27 2004-06-23 Visteon Global Tech Inc Dual ported gerotor fuel pump
GB2443088A (en) * 2006-10-18 2008-04-23 Concentric Vfp Ltd Gerotor pump with filling axial rotor slot.
WO2009130433A1 (fr) * 2008-04-22 2009-10-29 Concentric Vfp Limited Pompe avec fentes de remplissage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB681883A (en) * 1950-03-10 1952-10-29 Hobourn Eaton Mfg Co Ltd Improvements relating to internal gear pumps
GB1146913A (en) * 1965-07-09 1969-03-26 Germane Corp Rotary fluid pressure devices
DE1703573A1 (de) * 1967-07-21 1971-11-25 Reliance Electric & Eng Co Fluessigkeitsmotor
GB1407282A (en) * 1971-11-10 1975-09-24 Danfoss As Gerotor type rotary fluid-pressure machine
US4411607A (en) * 1980-04-23 1983-10-25 G. L. Rexroth Gmbh Internal gear machine with rotary pressure balanced valve disc
DE3243394A1 (de) * 1982-11-24 1984-05-24 Danfoss A/S, Nordborg Parallel- und innenachsige kreiskolbenmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB681883A (en) * 1950-03-10 1952-10-29 Hobourn Eaton Mfg Co Ltd Improvements relating to internal gear pumps
GB1146913A (en) * 1965-07-09 1969-03-26 Germane Corp Rotary fluid pressure devices
DE1703573A1 (de) * 1967-07-21 1971-11-25 Reliance Electric & Eng Co Fluessigkeitsmotor
GB1407282A (en) * 1971-11-10 1975-09-24 Danfoss As Gerotor type rotary fluid-pressure machine
US4411607A (en) * 1980-04-23 1983-10-25 G. L. Rexroth Gmbh Internal gear machine with rotary pressure balanced valve disc
DE3243394A1 (de) * 1982-11-24 1984-05-24 Danfoss A/S, Nordborg Parallel- und innenachsige kreiskolbenmaschine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2244097A (en) * 1987-08-03 1991-11-20 White Hollis Newcomb Jun Orbiting valve in gerotor device
GB2244097B (en) * 1987-08-03 1992-03-11 White Hollis Newcomb Jun Hydraulic gerotor devices.
GB2207705B (en) * 1987-08-03 1992-03-11 White Hollis Newcomb Jun Hydraulic gerotor devices
GB2207706A (en) * 1987-08-06 1989-02-08 Ushiji Negishi Rotary pump
GB2207706B (en) * 1987-08-06 1992-04-08 Ushiji Negishi Gerotor pump
GB2396385A (en) * 2002-11-27 2004-06-23 Visteon Global Tech Inc Dual ported gerotor fuel pump
GB2396385B (en) * 2002-11-27 2004-11-03 Visteon Global Tech Inc Gerotor fuel pump
GB2443088A (en) * 2006-10-18 2008-04-23 Concentric Vfp Ltd Gerotor pump with filling axial rotor slot.
GB2443088B (en) * 2006-10-18 2011-10-12 Concentric Vfp Ltd Pumps with filling slots
WO2009130433A1 (fr) * 2008-04-22 2009-10-29 Concentric Vfp Limited Pompe avec fentes de remplissage

Also Published As

Publication number Publication date
EP0242963A3 (fr) 1988-03-09
GB8606326D0 (en) 1986-04-23

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Inventor name: BRISTOW, IAN TREVOR

Inventor name: THORNELOW, ALEC