EP0255336A2 - Rotationsverdrängerpumpe - Google Patents

Rotationsverdrängerpumpe Download PDF

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Publication number
EP0255336A2
EP0255336A2 EP87306650A EP87306650A EP0255336A2 EP 0255336 A2 EP0255336 A2 EP 0255336A2 EP 87306650 A EP87306650 A EP 87306650A EP 87306650 A EP87306650 A EP 87306650A EP 0255336 A2 EP0255336 A2 EP 0255336A2
Authority
EP
European Patent Office
Prior art keywords
rotor
drive shaft
stator
heat
positive displacement
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.)
Withdrawn
Application number
EP87306650A
Other languages
English (en)
French (fr)
Other versions
EP0255336A3 (de
Inventor
Horst Fritz Marz
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.)
PPG Architectural Coatings Canada Inc
Original Assignee
Canadian Industries Ltd
CIL 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 Canadian Industries Ltd, CIL Inc filed Critical Canadian Industries Ltd
Publication of EP0255336A2 publication Critical patent/EP0255336A2/de
Publication of EP0255336A3 publication Critical patent/EP0255336A3/de
Withdrawn legal-status Critical Current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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • 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
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0076—Fixing rotors on shafts, e.g. by clamping together hub and shaft
    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type

Definitions

  • This invention relates to rotary positive displacement progressing cavity pumps in which a rigid metallic helical rotor shaft is rotated within a fixed stator.
  • the stator which is fabricated from a resilient material, such as, for example, an elastomer, has an axial longitudinal cavity therethrough, which cavity defines a helical groove.
  • the rotor makes contact with the stator to form a series of cavities which move in an axial direction to form a displacement pump.
  • a progressing cavity or "PC" pump Such a pump is well known and will hereinafter simply be referred to as a progressing cavity or "PC" pump.
  • PC pumps find common use in industries where it is required to pump high viscosity slurries or emulsions. Since the flow of material is proportional to rotational speed, PC pumps are particularly well suited for uses involving the delivery of material in precise amounts to, for example, a continuous packaging operation.
  • stator of a PC pump is generally formed of an elastomer and since the rotor must operate in tight contact with the stator, it is essential that the pump not be run dry if the integrity of the stator is to be preserved. Dry-running without passage of pumped fluid leads to overheating which, if not recognized and corrected, damages the stator. Similiarly, any blockage of an outlet valve or line beyond the PC can cause slippage of the rotor, overheating within the stator and possible damage to both stator and the pumped product. In some industries, such as in the pumping of flammable or explosive materials, such overheating must be scrupulously avoided for obvious reasons.
  • US- A- 2 512 765 describes the use of an externally mounted pressure switch capable of sensing high or low outlet pressures.
  • the switch controls the power supplied to the drive motor of the pump.
  • US- A- 3 111 904 describes making use of heat/friction expansible brake rings which are adapted to jam the rotor motion in the event of overheating.
  • US- A- 3 008 426 discloses the use of a frangible mechanical coupling which disconnects the pumping element from the pump drive in the event of mechanical failure or jamming.
  • US- A- 2 778 313 describes making use of an externally mounted, electrical power switching thermostat.
  • US- A- 1 426 206 describes the use of a fusible link mounted on the external casing of the pump, which link, in turn, controls an electric switch.
  • US- A- 4 500 268 describes making use of a fusible locking pin release mechanism which maintains the drive shaft in a rotation mode.
  • the present invention provides a rotary positive displacement progressing cavity (PC) pump having a heat-actuated, breakaway drive mechanism within the stator cavity.
  • PC progressing cavity
  • the invention provides a PC pump wherein the rotor is attached to the drive shaft by means of a bonded, fusible connection.
  • a rotary positive displacement progresssng cavity pump having a stator, a rotor within the stator, and an inlet and outlet in the stator and a drive shaft connected to the rotor, the drive shaft-to-rotor connection comprising a heat-sensitive, breakaway bond of a heat-fusible metal alloy in an amount sufficient to provide a mechanical linkage between the drive shaft and the rotor, the metal alloy being meltable upon the generation of sufficient heat within the stator and so disconnect the mechanical linkage.
  • the mechanical linkage comprises a longitudinal, cylindrical bore within the rotor having centrally located therein in fusible, metal-bonded relationship a leading end of the drive shaft.
  • the drive shaft leading end may have a helical groove indented upon its surface. Furthermore the drive shaft leading end may be centered within the cylindrical bore by means of plastic bushings.
  • the rotor when heated by excess friction or dry-running conditions within the stator, efficiently transmits heat to its core and to the heat fusible metal bond, which bond softens and causes mechanical disconnection of the rotor from the drive shaft.
  • a conventional positive displacement progressive cavity pump assembly 1 consisting of an inlet chamber 2, a drive shaft support housing 3 and a stator 4.
  • a metal, helical rotor 5 is shown located in stator 4.
  • a sectional drive shaft 6 (shown as 6A and 6B) is shown connected to rotor 5.
  • Drive shaft 6A is supported by bearings 7 (shown as 7A and 7B).
  • Two gear Universal joints 8A and 8B are provided in drive shaft 6.
  • a seal 9 is provided around drive shaft 6A.
  • Product to be pumped is introduced into inlet chamber 2 through opening 10 and is delivered by the pump through exit 11.
  • the drive shafts 6A and 6B and connected rotor 5 are rotated within the assembly by an electric or hydraulic motor (not shown).
  • rotor 5 is shown having a longitudinal, aligned, cylindrical bore 12 therein.
  • An extension 13 of the drive shaft is shown fitted centrally within cylindrical bore 12.
  • Fusible metallic binding material 14 is chosen from those metal alloys known to possess high mechanical or physical strength yet which have very low melting temperatures.
  • Bismuth alloys such as CERRO (Trade Mark) alloys available from Cerro Metal Products of Bellefonte, Pennsylvania, U.S.A., are particularly preferred. Such alloys are available in a range of suitable melting temperatures and physical strengths and, as well, possess moulding characteristics.
  • Drive shaft extension 13 may be simply bonded to rotor 5 by spacing the extension 13 centrally within cylindrical bore 12 and introducing the molten metal binding material 14 into the axial space between extension 13 and the wall of cylindrical bore 12. After solidification, a strong mechanical bond is created. In the event of high temperature generation within stator 4 during operation of the pump, heat is absorbed by rotor 5 and transmitted to the fusible metal bond 14. When sufficient heat has been transmitted to the core of rotor 5, metal 14 softens and the mechanical connection between shaft extension 13 and rotor 5 is broken, thus stopping the functioning of the pump.
  • a substitute rotor/shaft extension combination can be attached to drive shaft 6, the pump reassembled and the pumping operation resumed. In some instances, it will be possible to simply allow the pump assembly to cool, thus resolidifying the metal binding material 14 without the necessity of dismantling the pump.
  • Figure 3 shows the embodiment of Fi gure 2 wherein shaft extension 13 has on its surface a helical groove 15. Additionally, shaft extension 13 is shown centered and supported at each of its ends by plastic bushings 16 (shown as 16A and 16B).
  • the configuration shown in Figure 3 is particularly adapted for use in operations where explosive or other heat-sensitive materials are to be pumped.
  • the fusible metal 14 when molten is augered out of cylindrical bore 12 and into inlet chamber 2 by the rotation of grooved shaft extension 13.
  • Metal-to-metal contact between rotating shaft 13 and the walls of bore 12 is prevented by the supporting bushings 16.
  • a seal 17 is provided adjacent bushing 16A to prevent ingress of explosive or heat-sensitive material around the bushing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP87306650A 1986-07-29 1987-07-28 Rotationsverdrängerpumpe Withdrawn EP0255336A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA514904 1986-07-29
CA514904 1986-07-29

Publications (2)

Publication Number Publication Date
EP0255336A2 true EP0255336A2 (de) 1988-02-03
EP0255336A3 EP0255336A3 (de) 1988-05-04

Family

ID=4133651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87306650A Withdrawn EP0255336A3 (de) 1986-07-29 1987-07-28 Rotationsverdrängerpumpe

Country Status (7)

Country Link
EP (1) EP0255336A3 (de)
JP (1) JPS6338694A (de)
AU (1) AU7344087A (de)
BR (1) BR8703824A (de)
GB (1) GB2193292B (de)
NO (1) NO873153L (de)
NZ (1) NZ220313A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992020923A1 (de) * 1991-05-22 1992-11-26 Netzsch-Mohnopumpen Gmbh Gehäuse einer exzenterschneckenpumpe
US5603608A (en) * 1995-04-19 1997-02-18 Ici Canada, Inc. Methods and apparatus for monitoring progressive cavity pumps
WO1997047886A1 (en) * 1996-06-07 1997-12-18 Orica Trading Pty Ltd Progressive cavity pump
US6220838B1 (en) 1999-11-03 2001-04-24 Dyno Nobel Inc. Progressive cavity pump with meltable stator
WO2001033079A1 (en) * 1999-11-03 2001-05-10 Orica Explosives Technology Pty Ltd Pumps
EP1101946A3 (de) * 1999-11-19 2002-10-09 Capstone Turbine Corporation Verdichter/Pumpe mit gekreuzten Spiralen
WO2010021549A1 (en) * 2008-08-21 2010-02-25 Agr Subsea As Outer rotor of a progressing cavity pump having an inner and an outer rotor
US8388327B2 (en) 2007-09-20 2013-03-05 Agr Subsea As Progressing cavity pump with several pump sections
US8496456B2 (en) 2008-08-21 2013-07-30 Agr Subsea As Progressive cavity pump including inner and outer rotors and a wheel gear maintaining an interrelated speed ratio
US8556603B2 (en) 2007-09-11 2013-10-15 Agr Subsea As Progressing cavity pump adapted for pumping of compressible fluids
WO2017154023A1 (en) * 2016-03-07 2017-09-14 Sona Pumps Motor with positive displacement helical pump inside motor shaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015007521B4 (de) * 2015-06-12 2017-01-12 Netzsch Pumpen & Systeme Gmbh Pumpengehäuse für eine Exzenterschneckenpumpe und damit ausgestattete Exzenterschneckenpumpe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539534A (en) * 1949-11-23 1951-01-30 Phillips Petroleum Co Safety coupling device
US2873006A (en) * 1957-09-11 1959-02-10 Phillips Roy Brake adjustment mechanism
US3193068A (en) * 1962-04-24 1965-07-06 Ingersoll Rand Co Temperature-responsive coupling means
DE1816462A1 (de) * 1968-12-21 1970-07-02 Netzsch Maschinenfabrik Rotor fuer eine Schraubenpumpe

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992020923A1 (de) * 1991-05-22 1992-11-26 Netzsch-Mohnopumpen Gmbh Gehäuse einer exzenterschneckenpumpe
AU643621B2 (en) * 1991-05-22 1993-11-18 Netzsch-Mohnopumpen Gmbh Casing for an eccentric worm-screw pump
US5318416A (en) * 1991-05-22 1994-06-07 Netzsch-Mohnopumpen Gmbh Casing of an eccentric worm pump designed to burst at preselected pressure
US5603608A (en) * 1995-04-19 1997-02-18 Ici Canada, Inc. Methods and apparatus for monitoring progressive cavity pumps
WO1997047886A1 (en) * 1996-06-07 1997-12-18 Orica Trading Pty Ltd Progressive cavity pump
US5779460A (en) * 1996-06-07 1998-07-14 Ici Canada Inc. Progressive cavity pump with tamper-proof safety
AU721639B2 (en) * 1996-06-07 2000-07-13 Orica Explosives Technology Pty Ltd Progressive cavity pump
WO2001033079A1 (en) * 1999-11-03 2001-05-10 Orica Explosives Technology Pty Ltd Pumps
US6220838B1 (en) 1999-11-03 2001-04-24 Dyno Nobel Inc. Progressive cavity pump with meltable stator
EP1101946A3 (de) * 1999-11-19 2002-10-09 Capstone Turbine Corporation Verdichter/Pumpe mit gekreuzten Spiralen
US8556603B2 (en) 2007-09-11 2013-10-15 Agr Subsea As Progressing cavity pump adapted for pumping of compressible fluids
US8388327B2 (en) 2007-09-20 2013-03-05 Agr Subsea As Progressing cavity pump with several pump sections
WO2010021549A1 (en) * 2008-08-21 2010-02-25 Agr Subsea As Outer rotor of a progressing cavity pump having an inner and an outer rotor
NO329714B1 (no) * 2008-08-21 2010-12-06 Agr Subsea As Ytre rotor i eksenterskruepumpe med en indre og en ytre rotor
US8496456B2 (en) 2008-08-21 2013-07-30 Agr Subsea As Progressive cavity pump including inner and outer rotors and a wheel gear maintaining an interrelated speed ratio
US8613608B2 (en) 2008-08-21 2013-12-24 Agr Subsea As Progressive cavity pump having an inner rotor, an outer rotor, and transition end piece
WO2017154023A1 (en) * 2016-03-07 2017-09-14 Sona Pumps Motor with positive displacement helical pump inside motor shaft

Also Published As

Publication number Publication date
NZ220313A (en) 1988-06-30
NO873153D0 (no) 1987-07-28
GB2193292B (en) 1990-04-18
AU7344087A (en) 1988-02-04
BR8703824A (pt) 1988-03-29
GB2193292A (en) 1988-02-03
EP0255336A3 (de) 1988-05-04
JPS6338694A (ja) 1988-02-19
NO873153L (no) 1988-02-01
GB8711687D0 (en) 1987-06-24

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Inventor name: MARZ, HORST FRITZ