US3795459A - Pitot pump with slotted inlet passages in rotor case - Google Patents

Pitot pump with slotted inlet passages in rotor case Download PDF

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Publication number
US3795459A
US3795459A US00343504A US3795459DA US3795459A US 3795459 A US3795459 A US 3795459A US 00343504 A US00343504 A US 00343504A US 3795459D A US3795459D A US 3795459DA US 3795459 A US3795459 A US 3795459A
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US
United States
Prior art keywords
casing
slots
pitot
chamber
rotary casing
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
US00343504A
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English (en)
Inventor
J Erickson
C Williams
Arthur R Mc
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.)
Baker Hughes Oilfield Operations LLC
Original Assignee
Kobe Inc
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Filing date
Publication date
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Publication of US3795459A publication Critical patent/US3795459A/en
Assigned to BAKER OIL TOOLS, INC. reassignment BAKER OIL TOOLS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOBE, INC. A CORP OF CA
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/12—Pumps with scoops or like paring members protruding in the fluid circulating in a bowl

Definitions

  • the present invention relates in general to centrifugal pumps and, more particularly', to a centrifugal pump of the pitot type, such a pump comprising, as its general elements, a rotary casing including a pumping chamber, means for delivering a fluid to be pumped to the pumping chamber, a discharge duct coaxial with the rotary casing, and a stationary pitot tube in the rotary casing for picking up fluid adjacent the periphery ofthe casing with a ram effect and for delivering the fluid to the discharge duct.
  • the pitot tube extends radially ofthe rotary casing and is provided adjacent its outer end with an inlet adjacent the periphery of the rotary casing and facing in a direction opposite to the direction of rotation ofthe rotary casing.
  • the pitot tube is provided adjacent its inner end with an outlet communicating with the discharge duct.
  • Centrifugal pumps of the foregoing type are well known and have the advantage of providing a very simple structure for pumping fluids at high pressures and in relatively large volumes.
  • a pitot pump typical of the prior art is disclosed in U.S. Pat. No. 3,384,024, granted May 2l, i968 to William L. King.
  • the above King patent discloses a pitot pump in which fluid to be pumped is supplied to the periphery of the pumping chamber through radial passages enclosed within an end wall of the rotary casing.
  • Another common way to supply such fluid to the periphery of the pumping chamber of such a pump is merely between thin radial vanes attached to the inner surface of one or both side walls of the pumping chamber as shown), for example in the U.S. Pat. to Singelmann, No. 3,049,081, issued Aug. i4, i962, and the Great Britain Pat. No. 737,933, published Oct. 5, 1955, hereinafter referred to as vane type". pumps.
  • the primary object of this invention is to provide a pitot type pump of the general type disclosed in said King patent, but in which the generally radial passages supplying fluid yto be pumped to the periphery of the pumping chamber are slots left open on the side of each facing the pumping chamber and in direct communical tion with the chamber throughout the length of each, thereby substantially reducing the cost of manufacture of such a pump, as compared with the pump of the King patent.
  • Another object of the invention is to providel such substantially radial slots of substantially uniform cross section throughout the length of each, each slot being formed in an end wall of the rotary casing of the pump, to avoid the inefficiency of said prior art vane type pumps resulting from the fluid turbulence created by the use of radial vanes with diverging wall spaces therebetween.
  • a further object of such radial slots is to continuously purge the pump of any gas accumulating in the liquid being pumped.
  • FIG. l is a longitudinal sectional view ofa pitot pump which embodies the invention.
  • FIG. 2 is a vertical sectional view taken on the line 2-2 of FIG; l.
  • a pitot pump 20 comprising an outer housing 22 containing a rotary casing 24.
  • the rotary casing 24 is driven by an electric motor 26 mounted. on the housing 22, the rotary Casing being supported by the motor shaft 28.
  • the rotary casing 24 may be mounted on bearings within the housing 22 itself.
  • the housing 22 is provided with an inlet 30 for the fluid to be pumped, which inlet communicates with a chamber 32 leading to an annular passage 34 extending into one end wall 36 of the rotary casing 24.
  • an annular passage 34 extending into one end wall 36 of the rotary casing 24.
  • Within such end wall are generally radial slots 38 which communicate at their inner ends with the annular passage 34 and which communicate at their outer ends with the periphery of a pumping chamber 39 of the casing 24.
  • a stationary pitot or pickup tube 40 which is radially oriented and is provided adjacent its outer end with an inlet 42 facing in a direction opposite to the direction of rotation of the rotary casing 24.
  • the pitot tube 40 is provided adjacent its inner end with an outlet 44 coaxial with the rotary casing 24 and communicating with a discharge duct 46, also coaxial with the rotary casing 24, leading to an outlet 48 in the housing 22.
  • the annular passage 34 surrounds the discharge duct 46 throughout a portion of the length of the latter.
  • the general mode of operation of the pitot pump 20 is well known so ythat it does not need to be described in detail. Briefly, the centrifugal force produced by rotation of the casing 24 generates a high fluid pressure adjacent the outer periphery of the pumping chamber 39. The fluid at this high pressure enters the inlet 42 of the pitot tube 40, the pressure being further increased by the ram effect resulting from so orienting the inlet 42 that it faces in a direction opposite to the direction of rotation of the rotary casing 24. The fluid entering the pitot tube 40 flows through the outlet 44 and the discharge duct 46 to the main outlet 48 in the housing 22. It will be understood that the pitot tube 40 is stationary, being mounted on and suitably secured to the discharge duct 46.
  • the generally radial slots 38 are substantially uniform in cross-sectional area throughout their length, and, except for such slots, .
  • the inner surface 50 of the end wall 36 is substantially flat and perpendicular to the axis of the pump, which is another feature of the invention.
  • the slots are not exactly radial with respect to the longitudinal axis of the pump, but each is angled slightly with respect to a radius to intersect the annular passage 34 at a slight angle to improve the feed of fluid to the slots from the annular passage and therethrough, and this is another feature ofthe invention. It is also to be noted from FIG.
  • Such slots 38 may be formed by merely casting them into the inner surface 50 of the end wall 36 of the rotary casing, which contributes to the economy of manufacture ofthe invention, another important feature.
  • a rotary casing having an annular pumping chamber therein, one side wall of said chamber being provided with generally radial slots therein having one side throughout its length in open communication with said chamber, each of said slots being of substantially uniform cross section throughout its length and extending from a point adjacent to the rotational axis of said casing to a point adjacent to the inner periphery of said chamber;
  • housing means surrounding said rotary casing and having an inlet port and a discharge port;
  • tubular member rigidly mounted on said housing and extending into said chamber, there being an annular passage around said tubular member and communicating between said inlet port and the inner ends of said slots, said tubular member having an axial passage therein communicating at one end with said discharge port;
  • a pitot tube rigidly mounted on said tubular member and extending radially in said chamber, said pitot tube having adjacent its outer end a pitot inlet facing in a direction opposite to the direction of rotation of said casing, said pitot tube having a central passage therein communicating between said pitot inlet and the other end of said axial passage;
  • a device as defined in claim l in which said side wall of the pumping chamber is substantially flat, except for said slots therein, and substantially perpendicular to the rotational axis of said casing.
  • each of said slots is oriented at an angle to a radius through the rotational axis of the casing and the inner end of the slot in a direction opposite to the direction of rotation of said casing, to provide the inner end of each slot with a scoop effect on fluid in said annular passage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00343504A 1973-03-21 1973-03-21 Pitot pump with slotted inlet passages in rotor case Expired - Lifetime US3795459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34350473A 1973-03-21 1973-03-21

Publications (1)

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US3795459A true US3795459A (en) 1974-03-05

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ID=23346390

Family Applications (1)

Application Number Title Priority Date Filing Date
US00343504A Expired - Lifetime US3795459A (en) 1973-03-21 1973-03-21 Pitot pump with slotted inlet passages in rotor case

Country Status (10)

Country Link
US (1) US3795459A (fr)
JP (1) JPS49122002A (fr)
AR (1) AR200672A1 (fr)
AU (1) AU475076B2 (fr)
BE (1) BE810998A (fr)
DE (1) DE2405655A1 (fr)
FR (1) FR2222553B1 (fr)
GB (1) GB1440551A (fr)
NL (1) NL7400950A (fr)
ZA (1) ZA74489B (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045145A (en) * 1975-12-19 1977-08-30 Kobe, Inc. Pitot pump with turbulence elimination
EP0013038A1 (fr) * 1978-12-22 1980-07-09 Max Theodore Kardoes Pompe de Pitot
US4252499A (en) * 1979-10-01 1981-02-24 Kobe, Inc. Centrifugal pump
US4267964A (en) * 1979-10-01 1981-05-19 Kobe, Inc. Centrifugal separator with rotating pick-up tube
US4280790A (en) * 1979-02-26 1981-07-28 Kobe, Inc. Centrifugal pitot pump with means for improving net positive suction head
US4283005A (en) * 1979-10-01 1981-08-11 Kobe, Inc. Pump and centrifugal separator apparatus
US4355951A (en) * 1980-05-02 1982-10-26 Internorth, Inc. Full admission pitot pump
US5145314A (en) * 1991-04-18 1992-09-08 Sundstrand Corporation Low drag pitot pump and method of operating same
DE19718283C1 (de) * 1997-05-01 1998-11-19 Vaclac Feres Zentrifugalpumpe
NL1009952C2 (nl) * 1997-08-27 1999-06-23 Sterling Fluid Sys Bv Pitotbuispomp.
US5975840A (en) * 1997-10-29 1999-11-02 Envirotech Pumpsystems, Inc. Pitot tube pump having axial-stabilizing construction
DE19825186A1 (de) * 1998-06-05 2000-02-24 Vaclav Feres Zentrifugalpumpe
US9719516B2 (en) 2014-06-25 2017-08-01 Envirotech Pumpsystems, Inc. Pressure reducing rotor assembly for a pump
US10151314B2 (en) 2013-03-15 2018-12-11 Envirotech Pumpsystems, Inc. Gear-driven flow-through pitot tube pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004495A (en) * 1957-02-11 1961-10-17 New York Air Brake Co High speed hydrodynamic pump
US3384024A (en) * 1967-01-09 1968-05-21 Mckenzie Pump Corp Centrifugal pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004495A (en) * 1957-02-11 1961-10-17 New York Air Brake Co High speed hydrodynamic pump
US3384024A (en) * 1967-01-09 1968-05-21 Mckenzie Pump Corp Centrifugal pump

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045145A (en) * 1975-12-19 1977-08-30 Kobe, Inc. Pitot pump with turbulence elimination
EP0013038A1 (fr) * 1978-12-22 1980-07-09 Max Theodore Kardoes Pompe de Pitot
US4280790A (en) * 1979-02-26 1981-07-28 Kobe, Inc. Centrifugal pitot pump with means for improving net positive suction head
US4252499A (en) * 1979-10-01 1981-02-24 Kobe, Inc. Centrifugal pump
US4267964A (en) * 1979-10-01 1981-05-19 Kobe, Inc. Centrifugal separator with rotating pick-up tube
US4283005A (en) * 1979-10-01 1981-08-11 Kobe, Inc. Pump and centrifugal separator apparatus
US4355951A (en) * 1980-05-02 1982-10-26 Internorth, Inc. Full admission pitot pump
US5145314A (en) * 1991-04-18 1992-09-08 Sundstrand Corporation Low drag pitot pump and method of operating same
DE19718283C1 (de) * 1997-05-01 1998-11-19 Vaclac Feres Zentrifugalpumpe
NL1009952C2 (nl) * 1997-08-27 1999-06-23 Sterling Fluid Sys Bv Pitotbuispomp.
US5975840A (en) * 1997-10-29 1999-11-02 Envirotech Pumpsystems, Inc. Pitot tube pump having axial-stabilizing construction
DE19825186A1 (de) * 1998-06-05 2000-02-24 Vaclav Feres Zentrifugalpumpe
DE19825186C2 (de) * 1998-06-05 2000-05-31 Vaclav Feres Zentrifugalpumpe
US10151314B2 (en) 2013-03-15 2018-12-11 Envirotech Pumpsystems, Inc. Gear-driven flow-through pitot tube pump
US9719516B2 (en) 2014-06-25 2017-08-01 Envirotech Pumpsystems, Inc. Pressure reducing rotor assembly for a pump
US10280925B2 (en) 2014-06-25 2019-05-07 Envirotech Pumpsystems, Inc. Pressure reducing rotor assembly for a pump

Also Published As

Publication number Publication date
BE810998A (fr) 1974-08-14
ZA74489B (en) 1974-11-27
DE2405655A1 (de) 1974-10-10
NL7400950A (fr) 1974-09-24
AU6490874A (en) 1975-07-31
FR2222553B1 (fr) 1978-10-27
GB1440551A (en) 1976-06-23
FR2222553A1 (fr) 1974-10-18
AR200672A1 (es) 1974-11-29
AU475076B2 (en) 1976-08-12
JPS49122002A (fr) 1974-11-21

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AS Assignment

Owner name: BAKER OIL TOOLS, INC.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOBE, INC. A CORP OF CA;REEL/FRAME:004289/0558

Effective date: 19840629

Owner name: BAKER OIL TOOLS, INC., A CORP OF CA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOBE, INC. A CORP OF CA;REEL/FRAME:004289/0558

Effective date: 19840629