US3776658A - Pitot tube for pitot pump - Google Patents

Pitot tube for pitot pump Download PDF

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Publication number
US3776658A
US3776658A US00280677A US3776658DA US3776658A US 3776658 A US3776658 A US 3776658A US 00280677 A US00280677 A US 00280677A US 3776658D A US3776658D A US 3776658DA US 3776658 A US3776658 A US 3776658A
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United States
Prior art keywords
pitot tube
adjacent
vane
rotary casing
pitot
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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
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US00280677A
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English (en)
Inventor
J Erickson
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 US3776658A publication Critical patent/US3776658A/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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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
    • 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

  • ABSTRACT A pitot tube for a pitot pump, i.e., a centrifugal pump 11 3,776,658 1 1 Dec. 4, 1973 comprising a rotary casing, means for delivering a fluid to be pumped to the rotary casing, and a dis- 9 charge duct coaxial with the rotary casing.
  • the pitot tube is disposed in and extends radially of the rotary casing and is provided adajcent its outer end with an inlet facing in a direction opposite to the direction of rotation of the rotary casing, whereby the inlet receives fluid from adjacent the periphery of the rotary casing with a ram effect.
  • the pitot tube includes axially spaced side walls and is provided adjacent its inner end, and in one of such side walls, with an outlet communicating with the discharge duct and coaxial with the rotary casing.
  • a flow splitting vane which extends from one side wall to the other, such vane extending from adjacent the outlet to adjacent the outer end of the pitot tube and dividing the pitot tube into two compartments spaced apart circumferentially of the rotary casing, one compartment being adjacent the leading edge of the pitot tube and the other adjacent the trailing edge thereof.
  • This vane has the effect of streamlining the fluid flow through the outlet of the pitot tube and into and through the discharge duct, thereby minimizing flow losses.
  • PITOT TUBE FOR PITOT PUMP BACKGROUND OF INVENTION 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 of the 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 Pat. No. 3,384,024, granted May 21, 1968 to William L. King.
  • the primary object of the present invention is to minimize flow losses in the pitot or pickup tube of a centrifugal pump of the type hereinbefore outlined.
  • an important object is to provide a pitot tube provided therein with a flow splitting vane which extends from one side wall of the pitot tube to the other and which extends from adjacent the outlet of the pitot tube to adjacent the outer end thereof, this vane dividing the pitot tube into two compartments spaced apart circumferentially of the rotary casing and respectively located adjacent the leading and trailing edges of the pitot tube.
  • Related objects are to provide a construction wherein the vane traverses and bisects the outlet, wherein the vane extends laterally into the outlet, and wherein the vane and the trailing edge of the pitot tube converge from adjacent the inner end of the vane toward the outer end thereof.
  • FIG. I is a longitudinal sectional view of a pitot pump equipped with a pitot or pickup tube which embodies the invention.
  • FIG. 2 is an enlarged, transverse sectional view showing the pitot tube of the invention, FIG. 2 being taken as indicated by the arrowed line 22 of FIG. 1, and also by the arrowed line of FIG. 3;
  • FIG. 3 is a sectional view taken as indicated by the arrowed line 33 of FIG. 2;
  • FIGS. 4 and 5 are sectional views through the strut of the pitot tube and are taken as indicated by the arrowed lines 44 and 55, respectively, of FIG. 2;
  • FIGS. 6, 7, 8, 9, 10, 11, 12 and 13 are fragmentary sectionalviews through the trailing or rearward end of the head of the pitot tube and are taken along the arrowed lines 66, 7-7, 8-8, 99, 10-10, 1I-1l, l212 and 13l3, respectively, of FIG. 2 of the drawings.
  • FIG. 1 of the drawings illustrated therein is a pitot pump 20 comprising anouter 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 passages 38 which communicate at their inner ends with the annular passage 34 and which communicate at their outer ends with the interior of the rotary casing 24 adjacent the inner periphery thereof.
  • the pitot tube 40 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.
  • 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 that it does not need to be described in detail.
  • the centrifugal force produced by rotation of the casing 24 generates a high fluid pressure adjacent the inner periphery of the casing.
  • 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 edge 56.
  • the inner end of the strut 52 is disposed on the opposite side of the axis of rotation from the outer end thereof, and the outlet 44 is formed in one of the side walls 54 between the inner and outer ends of the strut.
  • the strut 52 in cross section, has a streamlined configuration with relatively sharp leading and trailing edges 56 and 58.
  • the head 50 is provided with a rearwardly extending passage 60 which merges smoothly with the outer end of a radial passage 62 in the strut 52, this radial passage leading inwardly to and surrounding the outlet 44.
  • the streamlining of the head 50 will be clear by progressively viewing FIGS. 3, 6, 7, 8, 9, 10, ll, 12, and 13.
  • the radial passage 62 is divided into circumferentially spaced, leading and trailing compartments 64 and 66 by a flow splitting vane 68 which extends from the inner end of the passage 62 substantially to the outer end thereof and which terminates at its outer end in a sharp edge 70.
  • the vane 68 traverses and bisects the outlet 44, as best shown in FIG. 2, and converges toward the trailing edge 58 of the strut 52 so that the trailing compartment 66 becomes progressively smaller in cross sectional area from its inner end toward its outer end, the reverse being true of the leading compartment 64.
  • the ratio of the maximum spacing of the outer surfaces of the side walls 54 to the spacing of the leading and trailing edges 56 and 58 should not be more than about 0.18. With this ratio, flow separation around the pitot tube 40 is avoided, and the drag 4 of the pitot tube is minimized.
  • the cross sectional area of the trailing compartment 66 in the area of FIG. 4 should be approximately half the area of the inlet 42 for minimum flow losses in the bend at the junction of the passages 60 and 62.
  • Another feature is that the side walls 54 are parallel in the outer portion of the strut 52, and then diverge radially inwardly toward the inner end of the strut, as shown in FIG. 3, to provide a diffuser 72. This construction results in maximum head recovery.
  • leading and trailing compartments 64 and 66 are kept as large as possible at their junction with the outlet 44, as shown in FIG. 5, to minimize flow losses in the bend joining these compartments and the outlet.
  • the radius at 74 is made as large as practicable to minimize the entrance losses into the outlet 44.
  • a pitot tube in and extending radially of said rotary casing, said pitot tube having adjacent its outer end an inlet facing in a direction opposite to the direction of rotation of said rotary casing, said pitot tube having axially spaced side walls providing therebe tween a radial passage and having circumferentially spaced edges joined to provide said pitot tube with circumferentially spaced leading and trailing edges, said pitot tube having adjacent its inner end, and in one of said side walls, an outlet coaxial with said rotary casing and connecting the inner end of said radial passage to said discharge duct, and said pitot tube further having a circumferentially rearwardly extending passage connecting said inlet to the outer end of said radial passage; and
  • a flow splitting vane in said radial passage in said pitot tube and extending from one side wall of said pitot tube to the other, said vane-extending generally radially from adjacent said outlet to adjacent said outer end of said radial passage in said pitot tube and dividing said radial passage in said pitot tube into two compartments spaced apart circumferentially of said rotary casing, and the outer end of said vane being spaced circumferentially from said inlet by said rearwardly extending passage.
  • a pitot tube for a pitot pump said pitot tube having radially spaced inner and outer ends and having circumferentially spaced leading and trailing edges connected by laterally spaced side walls providing therebetween a radial passage, said pitot tube having adjacent its outer end an inlet facing in the same direction as said leading edge and connected to the outer end of said radial passage by a circumferentially rearwardly extending passage, said pitot tube having an outlet adjacent its inner end and in one of said side walls and communicating with the inner end of said radial passage, said pitot tube having therein a flow splitting vane which is disposed in said radial passage and which extends laterally from one side wall of said pitot tube to the other, said vane extending generally radially outwardly from adjacent said outlet to adjacent said outer end of said radial passage in said pitot tube and dividing said radial passage in said pitot tube into leading and trailing compartments respectively adjacent said lead ing and trailing edges, and the outer end

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00280677A 1972-08-14 1972-08-14 Pitot tube for pitot pump Expired - Lifetime US3776658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28067772A 1972-08-14 1972-08-14

Publications (1)

Publication Number Publication Date
US3776658A true US3776658A (en) 1973-12-04

Family

ID=23074122

Family Applications (1)

Application Number Title Priority Date Filing Date
US00280677A Expired - Lifetime US3776658A (en) 1972-08-14 1972-08-14 Pitot tube for pitot pump

Country Status (15)

Country Link
US (1) US3776658A (nl)
JP (1) JPS522801B2 (nl)
AR (1) AR199485A1 (nl)
AU (1) AU469192B2 (nl)
BE (1) BE803521A (nl)
DE (1) DE2341076C3 (nl)
DK (1) DK136992B (nl)
FR (1) FR2196680A5 (nl)
GB (1) GB1395302A (nl)
IT (1) IT994138B (nl)
NL (1) NL148982B (nl)
NO (1) NO139233C (nl)
SE (1) SE391967B (nl)
SU (1) SU562215A3 (nl)
ZA (1) ZA735077B (nl)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994618A (en) * 1975-01-13 1976-11-30 Kobe, Inc. Multiple outlet pitot pump with different output flows and/or pressures
US3999881A (en) * 1975-09-02 1976-12-28 Kobe, Inc. Centrifugal pump of the pitot type
US4045145A (en) * 1975-12-19 1977-08-30 Kobe, Inc. Pitot pump with turbulence elimination
US4267964A (en) * 1979-10-01 1981-05-19 Kobe, Inc. Centrifugal separator with rotating pick-up tube
US4355951A (en) * 1980-05-02 1982-10-26 Internorth, Inc. Full admission pitot pump
EP0165684A1 (en) * 1984-05-03 1985-12-27 Genevac Limited Pump
US4596511A (en) * 1984-06-05 1986-06-24 Eddy Pump Corporation Eddy pump
EP0226294A1 (en) * 1985-11-12 1987-06-24 Dresser Industries Inc. Pitot tube for pitot type centrifugal pump
US4776753A (en) * 1986-10-28 1988-10-11 Eddy Pump Corporation Method of and apparatus for pumping viscous fluids
US4792275A (en) * 1986-12-24 1988-12-20 Eddy Pump Corporation Pump construction
US4815929A (en) * 1984-06-05 1989-03-28 Eddy Pump Corporation Eddy pump
US5145314A (en) * 1991-04-18 1992-09-08 Sundstrand Corporation Low drag pitot pump and method of operating same
WO1999037923A1 (en) 1998-01-21 1999-07-29 Envirotech Pumpsystems, Inc. Pitot tube inlet insert
US5975840A (en) * 1997-10-29 1999-11-02 Envirotech Pumpsystems, Inc. Pitot tube pump having axial-stabilizing construction
US6709227B2 (en) 2001-09-07 2004-03-23 Envirotech Pumpsystems, Inc. Pitot tube insert
US20060198731A1 (en) * 2005-03-03 2006-09-07 Envirotech Pumpsystems, Inc. Wear ring for a centrifugal pitot tube pump
US10151314B2 (en) 2013-03-15 2018-12-11 Envirotech Pumpsystems, Inc. Gear-driven flow-through pitot tube pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1217895A (fr) * 1958-12-12 1960-05-06 Snecma Pompe centrifuge à débit variable
US3004495A (en) * 1957-02-11 1961-10-17 New York Air Brake Co High speed hydrodynamic pump
US3051089A (en) * 1959-04-08 1962-08-28 Henschel Werke Gmbh Pumps
US3093080A (en) * 1961-03-15 1963-06-11 Tarifa Carlos Sauchez Hydraulic pumps
US3333468A (en) * 1964-11-30 1967-08-01 Sundstrand Corp Mass flow measuring system
US3384024A (en) * 1967-01-09 1968-05-21 Mckenzie Pump Corp Centrifugal pump

Patent Citations (6)

* 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
FR1217895A (fr) * 1958-12-12 1960-05-06 Snecma Pompe centrifuge à débit variable
US3051089A (en) * 1959-04-08 1962-08-28 Henschel Werke Gmbh Pumps
US3093080A (en) * 1961-03-15 1963-06-11 Tarifa Carlos Sauchez Hydraulic pumps
US3333468A (en) * 1964-11-30 1967-08-01 Sundstrand Corp Mass flow measuring system
US3384024A (en) * 1967-01-09 1968-05-21 Mckenzie Pump Corp Centrifugal pump

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994618A (en) * 1975-01-13 1976-11-30 Kobe, Inc. Multiple outlet pitot pump with different output flows and/or pressures
US3999881A (en) * 1975-09-02 1976-12-28 Kobe, Inc. Centrifugal pump of the pitot type
US4045145A (en) * 1975-12-19 1977-08-30 Kobe, Inc. Pitot pump with turbulence elimination
US4267964A (en) * 1979-10-01 1981-05-19 Kobe, Inc. Centrifugal separator with rotating pick-up tube
US4355951A (en) * 1980-05-02 1982-10-26 Internorth, Inc. Full admission pitot pump
EP0165684A1 (en) * 1984-05-03 1985-12-27 Genevac Limited Pump
US4815929A (en) * 1984-06-05 1989-03-28 Eddy Pump Corporation Eddy pump
US4596511A (en) * 1984-06-05 1986-06-24 Eddy Pump Corporation Eddy pump
EP0226294A1 (en) * 1985-11-12 1987-06-24 Dresser Industries Inc. Pitot tube for pitot type centrifugal pump
US4776753A (en) * 1986-10-28 1988-10-11 Eddy Pump Corporation Method of and apparatus for pumping viscous fluids
US4792275A (en) * 1986-12-24 1988-12-20 Eddy Pump Corporation Pump construction
US5145314A (en) * 1991-04-18 1992-09-08 Sundstrand Corporation Low drag pitot pump and method of operating same
US5975840A (en) * 1997-10-29 1999-11-02 Envirotech Pumpsystems, Inc. Pitot tube pump having axial-stabilizing construction
WO1999037923A1 (en) 1998-01-21 1999-07-29 Envirotech Pumpsystems, Inc. Pitot tube inlet insert
US5997243A (en) * 1998-01-21 1999-12-07 Envirotech Pumpsystems, Inc. Pitot tube inlet insert
AU738519B2 (en) * 1998-01-21 2001-09-20 Envirotech Pumpsystems, Inc. Pitot tube inlet insert
US6709227B2 (en) 2001-09-07 2004-03-23 Envirotech Pumpsystems, Inc. Pitot tube insert
US20060198731A1 (en) * 2005-03-03 2006-09-07 Envirotech Pumpsystems, Inc. Wear ring for a centrifugal pitot tube pump
US10151314B2 (en) 2013-03-15 2018-12-11 Envirotech Pumpsystems, Inc. Gear-driven flow-through pitot tube pump

Also Published As

Publication number Publication date
JPS522801B2 (nl) 1977-01-24
NL148982B (nl) 1976-03-15
DE2341076C3 (de) 1978-08-24
NL7310421A (nl) 1974-02-18
AU5857173A (en) 1975-01-30
DK136992B (da) 1977-12-27
FR2196680A5 (nl) 1974-03-15
SE391967B (sv) 1977-03-07
IT994138B (it) 1975-10-20
AU469192B2 (en) 1976-02-05
NO139233B (no) 1978-10-16
DE2341076B2 (de) 1977-12-22
ZA735077B (en) 1974-06-26
AR199485A1 (es) 1974-09-09
JPS49108601A (nl) 1974-10-16
BE803521A (fr) 1974-02-11
DE2341076A1 (de) 1974-03-07
DK136992C (nl) 1978-06-05
GB1395302A (en) 1975-05-21
NO139233C (no) 1979-01-24
SU562215A3 (ru) 1977-06-15

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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

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