WO2012164381A1 - Disposition d'amenée directe de substance pompée vers une pompe à vis jumelées - Google Patents

Disposition d'amenée directe de substance pompée vers une pompe à vis jumelées Download PDF

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Publication number
WO2012164381A1
WO2012164381A1 PCT/IB2012/001062 IB2012001062W WO2012164381A1 WO 2012164381 A1 WO2012164381 A1 WO 2012164381A1 IB 2012001062 W IB2012001062 W IB 2012001062W WO 2012164381 A1 WO2012164381 A1 WO 2012164381A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid passage
arrangement
fluid
flange
pump
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.)
Ceased
Application number
PCT/IB2012/001062
Other languages
English (en)
Inventor
Odd Marius Rosvold
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.)
Vetco Gray Scandinavia AS
Original Assignee
Vetco Gray Scandinavia AS
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 Vetco Gray Scandinavia AS filed Critical Vetco Gray Scandinavia AS
Publication of WO2012164381A1 publication Critical patent/WO2012164381A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F04C2/165—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type having more than two rotary pistons with parallel axes
    • 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
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • 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
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2250/00—Geometry
    • F04C2250/10—Geometry of the inlet or outlet
    • F04C2250/101—Geometry of the inlet or outlet of the inlet

Definitions

  • the present invention refers to twin-screw pumps and arrangements for the supply and discharge of pumped medium in a twin-screw pump. More specifically, the invention refers to a twin-screw pump arrangement which is configured for a direct supply of pumped medium to a pump chamber, and optionally also configured for a direct discharge of pumped medium from the pump chamber.
  • a vertically operated twin-screw pump 1 typically includes a pair of rotors 2, 3 comprising opposite pairs of intermeshing helical gears which are journalled and driven in rotation in a pump chamber defined by a rotor liner 4 which is coaxially provided inside a pump housing.
  • a centre section of the pump chamber communicates through an opening in the rotor liner with a discharge chamber 5 in the pump housing from where the medium is discharged downstream.
  • the end sections of the pump housing include an upper and lower supply chamber 6 and 7 communicating respectively with upper and lower feeding openings 8 and 9 to the pump rotors.
  • Pumped medium is supplied from upstream via fluid inlets to the upper and lower supply chambers, respectively.
  • the upper and lower supply chambers, as well as the discharge chamber are each respectively formed as annular compartments defined between the pump housing and the rotor liner.
  • a twin-screw pump having this general and typical structure is illustrated in Fig. 1 of the accompanying drawings.
  • the internal geometry of supply and discharge chambers in twin-screw pumps typically has regions of stagnant flow wherein accumulation of solids and gas can take place if a multiphase fluid, e.g., is delivered by the pump as is often the case in hydrocarbon production at sea or at land. This in turn may lead to corrosion and wear and may additionally cause dry running if the pump is supplied liquid at insufficient amounts for lubrication of the rotor screws.
  • the present invention provides a twin-screw pump arrangement which is configured for a direct supply of pumped medium to the pump chamber.
  • the pump arrangement may optionally be similarly configured for a direct discharge of pumped medium from the pump chamber.
  • the object is achieved through a twin-screw pump substantially as outlined above, wherein upper and lower fluid supply chambers are each respectively provided as a fluid passage that opens laterally in the inner periphery of a centrally open ring-shaped flange, the flange being connectable by its inner periphery to the rotor liner in position to establish direct flow communication between the fluid passage and the upper and/or lower feeding openings, as the case may be, to the pump chamber.
  • the fluid discharge chamber may be similarly provided as a fluid passage that opens laterally in the inner periphery of a centrally open ring-shaped flange which is insertable on the rotor liner for direct flow communication, via the inner periphery of the flange, between the fluid passage and one or more discharge openings into the pump chamber.
  • This way is achieved an integrated channelling system which can be optimized to provide even fluid flow and velocity distribution.
  • the present solution avoids an inlet geometry that includes areas/ regions with high flow speed and associated erosion, as well as areas/regions of low flow speed with associated agglomeration of solids and fluid phase separation.
  • the present invention provides a controlled fluid flow cross-sectional area.
  • a twin-screw pump equipped as specified is much less likely to erode or to be clogged by sand.
  • maintenance intervals can be extended and costly subsea intervention operations can be avoided, as well as the need for flushing the inlet channels or the need for over-dimensioning in order to have erosion margins.
  • the fluid passage is annular and arranged to mouth continuously along the inner periphery of the flange, this way achieving a circumferentially uniform distribution of pumped medium to the pump rotors.
  • the fluid passage may alternatively be annular and arranged to mouth at intervals along the inner periphery of the flange.
  • the fluid passage is preferably shaped with a rounded cross-sectional profile in order to avoid accumulation of solid matter and to further reduce the risk of erosion.
  • the internal flow-passage area may be varied in the direction of flow from a fluid inlet into the fluid passage.
  • the flow-passage area may be successively reducing in both circumferential directions from the fluid inlet to the fluid passage.
  • the fluid inlet into the fluid passage opens in the top (or in the bottom respectively) of the fluid passage, i.e. in the axial direction of the pump.
  • a device for splitting a supply fluid stream in two oppositely directed partial flows may be arranged in flow communication with the inlets to the upper and lower supply chambers, in other words arranged between the upper and lower flanges and preferably close to the rotor liner for a compact pump structure.
  • the flow splitting device is supported on the mid- positioned flange forming a discharge chamber.
  • the flow splitting device may advantageously be integrated in the flange that provides the discharge chamber.
  • the flow splitting device comprises a manifold having an inlet for supply fluid and two outlets in flow communication with the upper and lower fluid supply chambers, and in said manifold a dividing plate arranged to extend in the flow direction from an upstream end facing the manifold inlet to a downstream end that separates the two manifold outlets.
  • the dividing plate runs twisted between its upstream and downstream ends.
  • the fluid passage can be formed in a machining process by removing material from top and bottom ring-shaped flange parts that are connectable face to face to produce a fluid passage which is defined by top and bottom surfaces that meet under a radius in the outer periphery of the fluid passage.
  • the flange parts are made of corrosion resistant material, and the fluid passage may additionally be coated internally with a corrosion resistant and low friction material.
  • FIG. 1 is cross- sectional view showing a typical prior art twin-screw pump
  • Fig. 2 is a longitudinal section I-I through a twin-screw pump configured with upper and lower supply chambers according to the invention
  • Fig. 3 is a longitudinal section II-II through the pump at 90° displacement relative to the section of Fig. 2;
  • Fig. 4 is a transverse section through the upper supply chamber
  • Fig. 5 is a transverse section through a fluid discharge chamber and flow- splitting device arranged on the pump.
  • any reference to location in space such as upper, lower, outer, inner, vertical or horizontal etc., shall be understood primarily to describe the spatial relation between elements for the purpose of facilitating description and understanding of the invention, and is not intended to indicate absolute orientation of these elements in space.
  • the invention is not limited to pumps of vertical orientation in use.
  • the accompanying drawings are submitted for purpose of illustration only and are not true to scale or dimensions.
  • Fig. 1 shows the prior art twin-screw pump mentioned in the background
  • twin-screw pump 1 having a pair of motor driven rotors 2, 3 comprising opposite pairs of intermeshing helical gears which are journalled and driven in rotation in a pump chamber defined by a rotor liner 4.
  • a centre section of the pump chamber communicates through an opening in the rotor liner with a discharge chamber 5 from where the pumped medium is discharged downstream.
  • upper and lower fluid supply chambers 6 and 7 are arranged in flow communication with upper and lower feeding openings 8 and 9, respectively, to the pump rotors in the pump chamber. Pumped medium is supplied from upstream via fluid inlets 10 and 1 1 to the upper and lower supply chambers, respectively.
  • Each of the upper and lower supply chambers 6 and 7 are provided as fluid passages 6, 7 formed in a ring-shaped flange 12 and 13, respectively.
  • the flanges 12 and 13 are arranged with an open centre providing an inner flange periphery by which the flanges are connectable to a respective end of the rotor liner 4.
  • the fluid passages 6 and 7 run continuously about the inner periphery of the flange and mouth laterally such that when the flange is positioned on the rotor liner, a direct flow connection is established between the fluid passage and the upper or lower feeding opening 8 or 9 to the pump rotors.
  • Each of the upper and lower flanges 12 and 13 comprises an outer and an inner flange part 12a, 12b, 13a, 13b which are interconnected by a set of bolts insertable in bolt holes 14 (see also Fig. 4).
  • the outer flange part 12a as seen in the longitudinal direction of the pump 1 , is lifted away to show the axially inner flange part 12b.
  • the fluid passage 6 is recessed from the surface of flange part 12b, forming in flange part 12b a fluid passage bottom surface 6b.
  • a top surface 6a of fluid passage 6 is preferably similarly recessed from the surface of flange part 12a.
  • the entire fluid passage may be recessed from the surface of one of the outer or inner flange parts 12a or 12b.
  • the bottom and top surfaces meet under a radius r when the flange parts 12a, 12b are interconnected.
  • a radially inner periphery of the fluid passage 6 is laterally open towards the centre opening through the flange, thus coinciding with the flange's inner periphery.
  • the centre opening through flange part 12b is shaped for insertion of the flange part on the rotor liner 4.
  • the bottom surface 6b may be located flush with a rim 15 of the rotor liner, this rim defining the feeding opening 8 into the pump chamber and rotors.
  • flow communication between the fluid passage and the feeding opening is established continuously along the inner periphery of the flange.
  • the rim 15 of rotor liner 4 projects into the fluid passage 6, above the fluid passage bottom surface 6b.
  • Flow communication between the fluid passage 6 and the feeding opening 8 is established via a number of fluid inlets 16 formed as openings or cut outs 16 through the wall of the rotor liner, and distributed about the rim 15 for a uniform feed of fluid to the pump chamber and rotors.
  • Pumped medium is supplied to the fluid passage 6 via the fluid inlet 10 which opens in the bottom surface 6b of the axially inner and in Fig. 2 lower flange part 12b.
  • the fluid inlet 10 is via a pipe 17 connected to a flow splitting device 18 by which an incoming fluid stream is divided into partial flows supplied via pipes 17 and 19 to the upper and lower fluid passages 6 and 7, respectively, via fluid inlets 10 and 1 1.
  • the flow splitting device 18 is seated and supported in a mid-positioned flange 20 providing the discharge chamber 5 via which pumped medium is discharged downstream from the pump chamber.
  • the flange 20 is structured similarly to the upper and lower flanges 12, 13, thus comprising two interconnectable flange parts 20a, 20b together defining a fluid passage which provides the discharge chamber 5.
  • the flange 20 has a centre opening by which the flange 20 is insertable on the rotor liner 4 so as to position the open inner periphery of the discharge chamber 5 in overlapping position with fluid outlets 21 formed through the wall of the rotor liner 4. Pumped medium is discharged downstream via a fluid outlet 22 from the discharge chamber.
  • the flow splitting device 18 comprises a manifold of T-shape configuration having a fluid inlet and two oppositely directed fluid outlets.
  • a flow dividing plate 23 is arranged to split an incoming fluid stream into two partial flows which are directed into the pipes 17, 19 and thus towards the upper and lower supply chambers 6 and 7 respectively.
  • the dividing plate 23 is twisted through 90° to effect diversion of a horizontal supply fluid stream F into two oppositely directed vertical flows fl and f2.
  • the flanges 12, 13 and 20 that provide the supply and discharge chambers for the twin-screw pump 1 are preferably made of corrosion resistant metal and may additionally be coated for enhanced resistance against corrosion and against erosion of internal surfaces.
  • sealing elements will typically be applied at the interfaces between mating flange parts and between the flanges and the rotor liner as required in order to prevent intrusion of sea water, or to prevent escape of pumped medium into the sea.
  • the flanges may be welded to the rotor liner but are preferably arranged dismountable for inspection and maintenance purposes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

L'invention concerne une disposition pour pompe (1) à vis jumelées, la pompe comportant une paire de rotors (2, 3) dotés de paires opposées d'engrenages hélicoïdaux en prise guidés par paliers et entraînés en rotation dans une chambre de pompe définie par une chemise (4) de rotor dotée d'ouvertures supérieure et inférieure (8, 9) d'alimentation vers les rotors de la pompe, des chambres supérieure et inférieure (6, 7) d'amenée de fluide étant respectivement aménagées chacune en tant que passage (6, 7) de fluide qui débouche latéralement à la périphérie intérieure d'une bride annulaire (12, 13) ouverte en son centre, ladite bride pouvant être reliée par sa périphérie intérieure à la chemise de rotor dans une position permettant d'établir une communication directe d'écoulement entre le passage (6, 7) de fluide et les ouvertures supérieure et inférieure (8, 9) d'alimentation, selon le cas, vers la chambre de pompe.
PCT/IB2012/001062 2011-05-31 2012-05-31 Disposition d'amenée directe de substance pompée vers une pompe à vis jumelées Ceased WO2012164381A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20110797 2011-05-31
NO20110797A NO335184B1 (no) 2011-05-31 2011-05-31 Innretning for direkte tilførsel av et pumpet medium til en toskruepumpe

Publications (1)

Publication Number Publication Date
WO2012164381A1 true WO2012164381A1 (fr) 2012-12-06

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ID=47258451

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Application Number Title Priority Date Filing Date
PCT/IB2012/001062 Ceased WO2012164381A1 (fr) 2011-05-31 2012-05-31 Disposition d'amenée directe de substance pompée vers une pompe à vis jumelées

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NO (1) NO335184B1 (fr)
WO (1) WO2012164381A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106640628A (zh) * 2016-10-09 2017-05-10 广东技术师范学院 微啮合间隙高压螺杆泵
CN113757109A (zh) * 2021-07-22 2021-12-07 四川凯创机电设备有限公司 一种双螺杆泵用焊接衬套及制造工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552562A (en) * 1941-09-01 1943-04-14 Stothert & Pitt Ltd Improvements to screw displacement pumps
US2640430A (en) * 1949-09-24 1953-06-02 Laval Steam Turbine Co Screw pump or motor
US5738505A (en) * 1995-09-05 1998-04-14 Nuovo Pignone S.P.A. Perfected twin-screw pump, particularly suitable for the pumping of biphase fluids in a submerged environment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552562A (en) * 1941-09-01 1943-04-14 Stothert & Pitt Ltd Improvements to screw displacement pumps
US2640430A (en) * 1949-09-24 1953-06-02 Laval Steam Turbine Co Screw pump or motor
US5738505A (en) * 1995-09-05 1998-04-14 Nuovo Pignone S.P.A. Perfected twin-screw pump, particularly suitable for the pumping of biphase fluids in a submerged environment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106640628A (zh) * 2016-10-09 2017-05-10 广东技术师范学院 微啮合间隙高压螺杆泵
CN113757109A (zh) * 2021-07-22 2021-12-07 四川凯创机电设备有限公司 一种双螺杆泵用焊接衬套及制造工艺

Also Published As

Publication number Publication date
NO20110797A1 (no) 2012-12-03
NO335184B1 (no) 2014-10-13

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