US20060198731A1 - Wear ring for a centrifugal pitot tube pump - Google Patents

Wear ring for a centrifugal pitot tube pump Download PDF

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Publication number
US20060198731A1
US20060198731A1 US11/366,287 US36628706A US2006198731A1 US 20060198731 A1 US20060198731 A1 US 20060198731A1 US 36628706 A US36628706 A US 36628706A US 2006198731 A1 US2006198731 A1 US 2006198731A1
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US
United States
Prior art keywords
wear ring
rotating assembly
groove
pump
pitot tube
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.)
Abandoned
Application number
US11/366,287
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English (en)
Inventor
James Shaw
Joris Simon
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.)
Envirotech Pumpsystems Inc
Original Assignee
Envirotech Pumpsystems Inc
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 Envirotech Pumpsystems Inc filed Critical Envirotech Pumpsystems Inc
Priority to US11/366,287 priority Critical patent/US20060198731A1/en
Assigned to ENVIROTECH PUMPSYSTEMS, INC. reassignment ENVIROTECH PUMPSYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHAW, JAMES G., SIMON, JORIS
Publication of US20060198731A1 publication Critical patent/US20060198731A1/en
Abandoned 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • 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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps

Definitions

  • This invention relates to centrifugal pumps of the pitot tube type, and relates specifically to providing means for less expensively and more conveniently repairing the rotating case of the pump when the rotating case is damaged as a result of processing abrasive fluids.
  • Pitot tube pumps are a type of centrifugal pump which generally comprise a pump casing that forms a housing for a rotating assembly that surrounds a stationary pitot tube.
  • the rotating assembly further comprises a rotating case and a rotor cover that together serve to enclose the pitot tube.
  • the rotating assembly spins at a very high rate and as fluid enters the spinning rotating assembly, it is directed to the interior circumferential wall of the rotating case.
  • the stationary pitot tube has an opening, or inlet, which is positioned in very close proximity to the interior circumferential wall of the rotating case. Fluid moving at high velocity in the rotating case encounters the inlet of the pitot tube and is pumped to the outside of the pump through the pitot tube.
  • Pitot tube pumps do not process fluids containing abrasive solids very well.
  • a pitot tube pump has a relatively high velocity of fluid rotating in the pump at nearly the same velocity as the rotating case of the pump. As a result, some of the high velocity fluid enters the pitot tube inlet and some passes by the stationary pitot tube. If the fluid being processed contains abrasive solids, those solids will contact the surface of the pitot tube and will erode it away. The abrasive solids also have a tendency to deflect off the area of the pitot tube near the inlet and cause erosion of the interior wall of the rotating case in close proximity to the pitot tube inlet.
  • pitot tubes have been manufactured with hard metal or ceramic inserts at the tube inlet, as disclosed in U.S. Pat. No. 5,997,243.
  • the pitot tube has also been manufactured with hard metal coatings and diamond coatings on the surface.
  • the rotating case has also been manufactured with several different material coatings, such as with hard metal coatings, ceramic coatings and urethane coatings. All of these changes and coatings have worked to extend the life of the components, but ultimately they have failed.
  • the rotating assembly of a pitot tube pump is structured to receive a replaceable wear ring that is positioned in the rotating assembly where the component is most subject to wear due to pumping of abrasive fluids.
  • a replaceable wear ring that is positioned in the rotating assembly where the component is most subject to wear due to pumping of abrasive fluids.
  • the original wear ring becomes worn or damaged, it is removed from the rotating assembly, such as by simply grinding off a few tack welds that secure it to the rotating assembly, and is then lifted out of a preformed groove cast in the rotating assembly that is sized to receive the wear ring.
  • a new wear ring is then placed in the groove and is secured in place.
  • the rotating assembly i.e., the rotating case and rotor cover
  • This level of balance is required to maintain the vibration levels within acceptable limits for the life of the pump. In a pitot tube pump, balance and vibration are directly related. The better the rotating assembly is balanced, the lower the vibration level will be which results in a longer bearing life for the pump. This level of balance is very difficult to achieve by someone outside of the factory and is often never achieved in the field. Special tooling and structuring is required to achieve these levels.
  • the pump To effect the rebalancing of a rotating assembly, the pump must first be removed from its place of operation and taken to a repair station. Removing the pump from its installation involves disconnecting the piping, seal flush lines and couplings, and unbolting the pump from its base plate. Removal of the pump in this manner requires the pump to be re-aligned to the drive train when it is re-installed. Removal and re-installation of the pump can take from several hours to several days depending on the complexity of the pump operating system. The pump then has to be completely disassembled and a new rotating assembly installed on the shaft. The rotating assembly has to then be re-balanced. Then the pump can be rebuilt and re-installed on its base plate and re-aligned to the drive train.
  • the present invention avoids the conventional need for removing the pump from its base, thereby compromising the balance of the pump.
  • the front or suction side of the pump casing can be opened while it remains on its base plate, and the wear ring can be replaced with relatively simple ease. Consequently, with the present invention, only the suction and discharge piping and the front of the pump need to be disassembled and then reassembled.
  • the ease and simplicity of replacing the worn wear ring results in significant labor savings and reduces the amount of down-time of the pump.
  • FIG. 1 is an isometric view, in cross section, of a prior art centrifugal pump of the pitot tube type
  • FIG. 2 is an isometric view, in partial cross section, of the rotating assembly of the prior pump shown in FIG. 1 , with the pitot tube assembly removed;
  • FIG. 3 is an isometric view, in partial breakaway, of a rotating assembly of a pitot tube pump with the pitot tube assembly in position within the rotating assembly;
  • FIG. 4 is a partial cross section view in elevation of the rotating case and rotor cover, with the pitot tube assembly removed;
  • FIG. 5 is a partial cross section view in elevation of a rotor formed in accordance with the present invention.
  • FIG. 6 is a perspective view of a wear ring of the present invention.
  • FIG. 7 is an isometric view, in partial cut-away, of a rotating assembly of a pitot tube pump configured in accordance with the present invention and illustrating the wear ring in position within the rotating assembly;
  • FIG. 8 is an enlarged view of the rotating assembly configured in accordance with the present invention and illustrating the securement of the wear ring in position within the rotating assembly.
  • FIG. 1 illustrates a conventional centrifugal pump 10 of the pitot tube type.
  • the pump 10 generally comprises a pump casing 12 that forms a housing for a rotating assembly 14 and a pitot tube 16 .
  • the rotating assembly 14 further comprises a rotating case 18 and a rotor cover 20 , the combination of which provide an interior space 22 within which the pitot tube 16 is positioned.
  • the rotating assembly 14 is rotated by a drive shaft 24 connected to a motor (not shown). While the rotating assembly 14 of the pump 10 rotates during operation of the pump, the pitot tube 16 is stationary.
  • FIG. 2 further illustrates just the rotating assembly 14 and drive shaft 24 of a centrifugal pump of the pitot tube type, with the pitot tube removed.
  • the rotor cover 20 is removably secured to the rotating case 18 by means of a plurality of fasteners 25 , such as bolts.
  • the rotor cover 20 is formed with an opening 26 through which the pitot tube (not shown) extends when the pump is fully assembled.
  • the rotating case 18 is somewhat bowl-shaped in that the rotating case 18 has an axially-extending peripheral wall 28 .
  • the pitot tube 16 is formed with an inlet 30 through which high velocity fluid enters as the rotating assembly 14 rotates.
  • the inlet 30 of the pitot tube 16 is positioned in close proximity to the peripheral wall 28 of the rotating case 18 for this purpose.
  • the high velocity fluid strikes the inlet 30 of the pitot tube 16 , some of the fluid will enter the inlet 30 , but some of the fluid is deflected by the pitot tube 16 and is thrown against the peripheral wall 28 of the rotating case 18 .
  • the fluid that is deflected by the inlet 30 of the pitot tube 16 eventually causes an area of erosion in the peripheral wall 28 of the rotating case 18 , as depicted by the trough 34 illustrated in FIG. 4 .
  • the trough 34 or area of erosion of the rotating case 18 is principally confined to that area of the peripheral wall 28 that is directly adjacent the inlet 30 of the pitot tube 16 .
  • various attempts have been made to improve the abrasion-resistant character of the rotating case 18 in the area of typical erosion, but without success.
  • FIGS. 5-8 illustrate the solution provided by the present invention.
  • a groove 40 is formed in the peripheral wall 28 of the rotating case 18 in that portion of the peripheral wall 28 adjacent the position of the pitot tube inlet and, consequently, that portion of the wall 28 that would be conventionally eroded by fluid deflected away from the inlet of the pitot tube.
  • the groove 40 is formed in the circumference of the peripheral wall 28 during the casting process and is sized is axial width and radial depth to accommodate a removable wear ring 42 , as shown in FIG. 6 .
  • the groove 40 is shown formed in the rotating case 18 , it may be suitable to form the groove 40 in the wall of the rotor cover 20 if the rotating assembly 14 is so configured.
  • the wear ring 42 of the present invention is generally formed as a band sized in axial width 44 , length 46 and radial depth 48 to fit snugly within the groove 40 formed in the rotating case 18 , as shown in FIG. 7 . While the wear ring 42 is illustrated here as comprising a flattened band, the profile in cross section, as taken through the radial depth 48 of the wear ring 42 , may be other than flat (e.g., triangular shaped) to conform to a selected similar shape of groove 40 formed in the rotating case 18 .
  • the radial depth 48 of the wear ring 42 is preferably equal to the radial depth of the groove 40 ; however, the radial depth 48 of the wear ring 42 may be slightly greater or slightly less than the radial depth of the groove 40 . It is only important that the radial depth 48 of the wear ring 42 be sized such that the pitot tube does not impact the wear ring 42 at any time during operation of the pump.
  • the wear ring 42 which is most suitably formed of a hard metal, ceramic or alloy material, is formed in a manner that allows the circumference of the wear ring 42 to be slightly flexible or able to expand and contract in an amount sufficient to allow positioning of the wear ring 42 within the groove 40 , and to allow removal of the wear ring 42 from the groove when replacement is required. As shown in FIG.
  • the contractibility and expandability of the wear ring 42 may be provided by forming the wear ring 42 with two free ends 50 , 52 that enable one end 50 , 52 of the wear ring 42 to be positioned in overlapping juxtaposition to the other end 50 , 52 so that the circumference of the wear ring 42 can be contracted an amount sufficient to fit the wear ring 42 into the groove 40 formed in the rotating case 18 .
  • the wear ring 42 may then expand, or spring back, to its original position with the two free ends 50 , 52 positioned adjacent each other as shown in FIGS. 6 and 8 .
  • the wear ring 42 may be structured or configured in other suitable ways to enable the wear ring 42 to be positioned in the groove 40 of the rotating case 18 , including a configuration where the wear ring 42 is continuous (i.e., without free ends).
  • the two free ends 50 , 52 may be secured in position by any appropriate means, such as tack welds 54 .
  • the worn wear ring 42 may be conveniently and quickly removed from the groove 40 in the rotating case 18 and replaced with a new wear ring 42 .
  • the groove 40 may be structured with a small notch 56 , as shown in FIG. 8 .
  • the tack welds 54 are broken to release the free ends 50 , 52 of the wear ring 42 .
  • An object, such as the blade of a screwdriver or pocket knife, is positioned in the notch 56 and one of the free ends 50 of the wear ring 42 is thereby lifted from the groove 40 .
  • the raised free end 50 can then be used to pull the worn wear ring 42 from the groove.
  • a new wear ring 42 may then be positioned in the groove 42 , making sure to position the free ends 50 , 52 near the notch 56 , and may be tack welded 54 into place.
  • effecting a replacement of the worn wear ring 42 involves simply removing the front or suction casing 60 portion of the pump casing 12 , removing the rotor cover 20 from the rotating case 18 and removing the pitot tube 16 from the rotating assembly 14 . Removal of those components of the pump 10 does not affect the balance of the pump, and does not require moving any other portion of the pump which would compromise its installation. Therefore, it can be appreciated that the wear ring of the present invention provides a significantly improved means for effecting repair of the rotating assembly caused by erosion or other damage.
  • the wear ring of the present invention may be adapted for use in other types of pumps and, consequently, reference herein to specific details of the invention are by way of example and not by way of limitation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US11/366,287 2005-03-03 2006-03-02 Wear ring for a centrifugal pitot tube pump Abandoned US20060198731A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/366,287 US20060198731A1 (en) 2005-03-03 2006-03-02 Wear ring for a centrifugal pitot tube pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65839905P 2005-03-03 2005-03-03
US11/366,287 US20060198731A1 (en) 2005-03-03 2006-03-02 Wear ring for a centrifugal pitot tube pump

Publications (1)

Publication Number Publication Date
US20060198731A1 true US20060198731A1 (en) 2006-09-07

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ID=36953854

Family Applications (1)

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US11/366,287 Abandoned US20060198731A1 (en) 2005-03-03 2006-03-02 Wear ring for a centrifugal pitot tube pump

Country Status (6)

Country Link
US (1) US20060198731A1 (fr)
CN (1) CN101133253A (fr)
BR (1) BRPI0607411A2 (fr)
DE (1) DE112006000496T5 (fr)
GB (1) GB2438344B (fr)
WO (1) WO2006096448A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8403625B2 (en) 2009-05-19 2013-03-26 Ksb Aktiengesellschaft Pitot tube pump
WO2015038616A1 (fr) * 2013-09-10 2015-03-19 Schlumberger Canada Limited Bagues d'usure pour étages de pompe électrique submersible
US11808265B2 (en) 2019-12-06 2023-11-07 Kinetic Technology Systems, Llc Energy-conserving fluid pump

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103062110A (zh) * 2011-10-21 2013-04-24 成都思茂科技有限公司 防锈给水泵磨损环
US10151314B2 (en) 2013-03-15 2018-12-11 Envirotech Pumpsystems, Inc. Gear-driven flow-through pitot tube pump
ITCO20130069A1 (it) * 2013-12-18 2015-06-19 Nuovo Pignone Srl Compressore centrifugo multistadio

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776658A (en) * 1972-08-14 1973-12-04 Kobe Inc Pitot tube for pitot pump
US3822102A (en) * 1973-03-05 1974-07-02 Kobe Inc Pitot pump with thrust balance
US3999881A (en) * 1975-09-02 1976-12-28 Kobe, Inc. Centrifugal pump of the pitot type
US4036427A (en) * 1975-06-06 1977-07-19 Kobe, Inc. Combination pitot pump and centrifugal separator
US4251184A (en) * 1979-03-23 1981-02-17 Kobe, Inc. Centrifugal pump
US4252499A (en) * 1979-10-01 1981-02-24 Kobe, Inc. Centrifugal pump
US4264269A (en) * 1978-09-25 1981-04-28 Kobe, Inc. Centrifugal pitot pump with improved pitot
US4279571A (en) * 1979-10-01 1981-07-21 Kobe, Inc. Pitot pump with fluid lubricated bearings
US4674950A (en) * 1985-11-12 1987-06-23 Dresser Industries, Inc. Pitot tube for pitot type centrifugal pump
US5324560A (en) * 1988-08-29 1994-06-28 Oblander M Duane Method of molding a polyurethane wear ring
US5997243A (en) * 1998-01-21 1999-12-07 Envirotech Pumpsystems, Inc. Pitot tube inlet insert
US20050236245A1 (en) * 2004-04-27 2005-10-27 Inertia Dynamics, Inc. Clutch with wear ring

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776658A (en) * 1972-08-14 1973-12-04 Kobe Inc Pitot tube for pitot pump
US3822102A (en) * 1973-03-05 1974-07-02 Kobe Inc Pitot pump with thrust balance
US4036427A (en) * 1975-06-06 1977-07-19 Kobe, Inc. Combination pitot pump and centrifugal separator
US3999881A (en) * 1975-09-02 1976-12-28 Kobe, Inc. Centrifugal pump of the pitot type
US4264269A (en) * 1978-09-25 1981-04-28 Kobe, Inc. Centrifugal pitot pump with improved pitot
US4251184A (en) * 1979-03-23 1981-02-17 Kobe, Inc. Centrifugal pump
US4252499A (en) * 1979-10-01 1981-02-24 Kobe, Inc. Centrifugal pump
US4279571A (en) * 1979-10-01 1981-07-21 Kobe, Inc. Pitot pump with fluid lubricated bearings
US4674950A (en) * 1985-11-12 1987-06-23 Dresser Industries, Inc. Pitot tube for pitot type centrifugal pump
US5324560A (en) * 1988-08-29 1994-06-28 Oblander M Duane Method of molding a polyurethane wear ring
US5997243A (en) * 1998-01-21 1999-12-07 Envirotech Pumpsystems, Inc. Pitot tube inlet insert
US20050236245A1 (en) * 2004-04-27 2005-10-27 Inertia Dynamics, Inc. Clutch with wear ring

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8403625B2 (en) 2009-05-19 2013-03-26 Ksb Aktiengesellschaft Pitot tube pump
WO2015038616A1 (fr) * 2013-09-10 2015-03-19 Schlumberger Canada Limited Bagues d'usure pour étages de pompe électrique submersible
GB2532169A (en) * 2013-09-10 2016-05-11 Schlumberger Holdings Wear rings for electric submersible pump stages
US10968918B2 (en) 2013-09-10 2021-04-06 Schlumberger Technology Corporation Wear rings for electric submersible pump stages
US11808265B2 (en) 2019-12-06 2023-11-07 Kinetic Technology Systems, Llc Energy-conserving fluid pump

Also Published As

Publication number Publication date
CN101133253A (zh) 2008-02-27
GB2438344B (en) 2010-10-27
GB2438344A (en) 2007-11-21
WO2006096448A2 (fr) 2006-09-14
DE112006000496T5 (de) 2008-01-24
WO2006096448A3 (fr) 2007-10-04
BRPI0607411A2 (pt) 2009-09-01
GB0717088D0 (en) 2007-10-17

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Date Code Title Description
AS Assignment

Owner name: ENVIROTECH PUMPSYSTEMS, INC., UTAH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHAW, JAMES G.;SIMON, JORIS;REEL/FRAME:017640/0084

Effective date: 20060302

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION