US3847503A - Centrifugal pumps for pumping liquids - Google Patents

Centrifugal pumps for pumping liquids Download PDF

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Publication number
US3847503A
US3847503A US00319649A US31964972A US3847503A US 3847503 A US3847503 A US 3847503A US 00319649 A US00319649 A US 00319649A US 31964972 A US31964972 A US 31964972A US 3847503 A US3847503 A US 3847503A
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US
United States
Prior art keywords
fingers
passage
pump
center body
shroud
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
US00319649A
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English (en)
Inventor
H Bottoms
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.)
Northrop Grumman Properties Ltd
Original Assignee
Lucas Aerospace 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 Lucas Aerospace Ltd filed Critical Lucas Aerospace Ltd
Application granted granted Critical
Publication of US3847503A publication Critical patent/US3847503A/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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock

Definitions

  • a centrifugal pump in accordance with the invention includes a body defining a pump inlet chamber, a rotor mounted within the body and including a center body tapering towards said chamber, a shroud surrounding the center body and defining therewith a passage of annular section, the internal and external diameters of which increase in one axial direction, vanes interconnecting the shroud and the center body at one end of said passage, namely that end thereof at which said diameters are greater, and a plurality of fingers mounted on the shroud and/or the center body adjacent the opposite end of said passage, with said fingers projecting across the passage and being arranged in a plurality of annular rows.
  • FIG. 1 is a section through one example of a pump in accordance with the invention.
  • FIG. 2 is a section through another example of the invention.
  • FIG. 3 is an enlarged fragmentary section on line 33 in FIG. 2;
  • FIG. 4 is a section through yet another example of the invention.
  • FIG. 5 is an enlarged fragmentary section on line 55 in FIG. 4;
  • FIG. 6 is a section through yet a further example of the invention.
  • FIG. 7 is an enlarged fragmentary section on line 7-7 in FIG. 6.
  • the pump includes a body 10 which defines a pump inlet chamber 11 and an outlet 12.
  • a rotor 13 which includes a center body 14 and a shroud 15.
  • the center body 14 and the shroud l5 define therebetween an annularsection passage 16, the internal and external diameters of which both increase in one axial direction.
  • the center body and the shroud are interconnected by a plurality of vanes 17, and at the opposite end of the rotor, i.e., adjacentthe inlet chamber 11, a plurality of fingers 18,19, 20, and 21 are mounted on the center bod ' A: will be apparent from the drawings, the fingers 18, which may consist simply of lengths of circular section wire inserted into sockets in the center body, are arranged in annular rows with the lengths of the fingers decreasing step by step along thepassage in the direction towards the outlet 12. In addition, the fingers 18 are inclined to the axis of the rotor, with the fingers l8 in the row adjacent the inlet 11 being the least steeply inclined and the inclination increasing step by step along the passage towards the outlet 12.
  • Each of the fingers l8 creates a wake at a lower pressure. Vapor tends to occur less in the lower pressure wake and is then reabsorbed in the liquid.
  • the fingers assist in initiating swirling movement of the liquid before it reaches the vanes 17 and also, provided there is already some movement of the liquid along the passage, help to induce such movement. Acceleration of liquid along the passage is therefore accomplished with less shock and therefore less vapor generation than can be achieved with a conventional screw type inducer which is only correctly pitched for a single flow rate/rotary speed condition.
  • the rotor 13 is provided with inwardly protecting fingers 22 and 23 on the shroud 15. As shown in FIG. 3, these fingers are hollow and each is formed with a plurality of nozzles 22a, 23a through which liquid supplied to the interior of each finger issues into the passage 16. These nozzles 22a,
  • the nozzles 23a have their axes inclined to a plane including the axes of all the fingers of a row of the fingers. Moreover, the inclination of the axes of the nozzles 23a of the finger 23 is steeper than the inclination of the axes of the nozzles 22a in the finger 22.
  • Liquid under pressure is supplied to the interiors of the fingers 22, 23 via passages in the shroud communicating with grooves 24 in an hydrostatic bearing 25 which assists in supporting the rotor within the body 10.
  • a tapping 26 is provided in the outlet 12 of the pump and a suitable controlvalve arrangement 27 is provided for controlling flow of the liquid from the outlet 12 to the fingers 22, 23 in accordance with the prevailing flow conditions.
  • fingers 28, 29 which are again provided on the shroud are each formed with a diametral longitudinally extending slot 28a 29a and each such slot has its general plane inclined to the plane of the axes of the fingers in a row of the fingers. Moreover, the cross sectional shape of each slot is convergent so that liquid passing through the slot is accelerated. The inclination of the slots 29a is steeper than the inclination of the slots 28a so that, once again, flow along the passage 16 is again induced by the fingers 28, 29. It will be appreciated, however, that the shock produced by the'fingers 28, 29 will be less than that produced by a conventional screw inducer, even though the angle of inclination of the slots may not exactly match the angle at which the liquid flows through the passage for all flow conditions.
  • FIGS. 6 and 7 are similar to that-described with reference to FIGS. 4 and 5.
  • fingers 30, 31 are anchored at both ends in holes in the shroud 32 and the center body 33.
  • the fingers 30 extend radially while the fingers 31 are inclined to the axis of the rotor.
  • Each of the fingers 30, 31 is of circular cross-section externally so that it fits within simple bores in the shroud 32 and center body 33.
  • Each finger 30, 31 has a slot 30a, 31a which has a cross-sectional configuration as shown in FIG. 7 which- I claim:
  • a centrifugal pump for use in pumping liquids comprising a body defining a pump inlet chamber, a rotor mounted within the body and including a center body member tapering towards said chamber, a shroud member surrounding the center body member and defining therewith a passage of annular section, the internal and external diameters of which increase in one axial direction, vanes interconnecting the shroud member and the center body member at one end of said passage, namely that end thereof at which said diameters are greater, and a plurality of fingers mounted on at least one of said members, adjacent the opposite end of said passage, said fingers projecting across the passage and being arranged in a plurality of annular rows, said fingers being cylindrical and provided with converging slots of inclined to the axis of the center body member, whereby fingers generate axial flow through slots causing an emulsion of fuel and vapor to form.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Motor Or Generator Frames (AREA)
US00319649A 1972-01-12 1972-12-29 Centrifugal pumps for pumping liquids Expired - Lifetime US3847503A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB140372 1972-01-12
GB4707472A GB1417549A (en) 1972-01-12 1972-10-12 Centrifugal pumps for pumping liquids

Publications (1)

Publication Number Publication Date
US3847503A true US3847503A (en) 1974-11-12

Family

ID=26236717

Family Applications (1)

Application Number Title Priority Date Filing Date
US00319649A Expired - Lifetime US3847503A (en) 1972-01-12 1972-12-29 Centrifugal pumps for pumping liquids

Country Status (6)

Country Link
US (1) US3847503A (cs)
JP (1) JPS525361B2 (cs)
DE (1) DE2300998C3 (cs)
FR (1) FR2167948A5 (cs)
GB (1) GB1417549A (cs)
IT (1) IT976798B (cs)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4426190A (en) 1980-12-11 1984-01-17 Shapiro Anatoly S Vane pump
GB8507010D0 (en) * 1985-03-19 1985-04-24 Framo Dev Ltd Compressor unit
JP4959424B2 (ja) * 2007-05-31 2012-06-20 勇 青谷 ポンプ装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE238089C (cs) *
US795938A (en) * 1903-08-17 1905-08-01 James M Seymour Jr Blower or fan.
US1073413A (en) * 1910-09-30 1913-09-16 Hermann Faehrmann Propeller.
US1622930A (en) * 1921-10-08 1927-03-29 Karman Theodor Von Turbo machine
US2576700A (en) * 1947-06-02 1951-11-27 Schneider Brothers Company Blading for fluid flow devices
US2650752A (en) * 1949-08-27 1953-09-01 United Aircraft Corp Boundary layer control in blowers
CA577325A (en) * 1959-06-09 M. Borden David Centrifugal compressor for a gas turbine engine
US3588266A (en) * 1967-08-11 1971-06-28 Rolls Royce Low specific speed rotary pump
US3588280A (en) * 1969-08-19 1971-06-28 Shmariahu Yedidiah Inducers for centrifugal pumps

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE238089C (cs) *
CA577325A (en) * 1959-06-09 M. Borden David Centrifugal compressor for a gas turbine engine
US795938A (en) * 1903-08-17 1905-08-01 James M Seymour Jr Blower or fan.
US1073413A (en) * 1910-09-30 1913-09-16 Hermann Faehrmann Propeller.
US1622930A (en) * 1921-10-08 1927-03-29 Karman Theodor Von Turbo machine
US2576700A (en) * 1947-06-02 1951-11-27 Schneider Brothers Company Blading for fluid flow devices
US2650752A (en) * 1949-08-27 1953-09-01 United Aircraft Corp Boundary layer control in blowers
US3588266A (en) * 1967-08-11 1971-06-28 Rolls Royce Low specific speed rotary pump
US3588280A (en) * 1969-08-19 1971-06-28 Shmariahu Yedidiah Inducers for centrifugal pumps

Also Published As

Publication number Publication date
FR2167948A5 (cs) 1973-08-24
DE2300998A1 (de) 1973-07-19
DE2300998B2 (de) 1977-12-29
IT976798B (it) 1974-09-10
JPS525361B2 (cs) 1977-02-12
DE2300998C3 (de) 1978-08-17
GB1417549A (en) 1975-12-10
JPS4882406A (cs) 1973-11-05

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