EP0405161A1 - Pompe à rotors hélicoidaux - Google Patents

Pompe à rotors hélicoidaux Download PDF

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Publication number
EP0405161A1
EP0405161A1 EP90110216A EP90110216A EP0405161A1 EP 0405161 A1 EP0405161 A1 EP 0405161A1 EP 90110216 A EP90110216 A EP 90110216A EP 90110216 A EP90110216 A EP 90110216A EP 0405161 A1 EP0405161 A1 EP 0405161A1
Authority
EP
European Patent Office
Prior art keywords
bearing
screw pump
spindle
pump according
recess
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.)
Granted
Application number
EP90110216A
Other languages
German (de)
English (en)
Other versions
EP0405161B1 (fr
Inventor
Wolfgang Dipl.-Ing. Leiber (Fh)
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.)
Allweiler GmbH
Original Assignee
Allweiler AG
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 Allweiler AG filed Critical Allweiler AG
Publication of EP0405161A1 publication Critical patent/EP0405161A1/fr
Application granted granted Critical
Publication of EP0405161B1 publication Critical patent/EP0405161B1/fr
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
    • 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

Definitions

  • the invention relates to a screw pump with a drive spindle arranged in a pump housing and at least one sealing spindle which is / are arranged on the suction side in a bearing recess of a pump part, in particular a pump cover, by means of a pin-like end.
  • Such a screw pump with two sealing or running spindles flanking the drive spindle can be found, for example, in DE-PS 716 161; the bearing recesses for all spindles are located in the pump cover and connected to the interior of the pump housing.
  • centrifugal pumps which are otherwise very suitable for conveying low-viscosity fluids, decrease in efficiency with decreasing specific speeds and, on the other hand, that the use of displacement machines is indicated at high pressures and low flow rates. Especially in the performance range of very low specific speeds, the performance and delivery characteristics of an internally mounted screw pump are desired.
  • the inventor has set itself the goal of enabling the delivery of non-lubricating fluids with internally mounted screw pumps for the range of very low specific speeds despite their critical zones, which exist due to the functionally large overall sliding surfaces; these zones primarily include the bearings for absorbing the axial thrust of the spindles.
  • the free end face of the bearing bush with the bottom of the recess of the pump cover delimits a tight gap space connected to the interior of the screw pump. which is preferably connected to an extension of the interior via a radial line.
  • the profile outlet of the sealing spindle is surrounded by a compensating bush, which strikes with its pressure-side end on a shoulder of the spindle. With its suction-side end, this compensating sleeve forms a control edge, which preferably faces a shell made of low-wear material in the bearing sleeve. Since this shell is longer than the end of the bearing journal free from the compensating bush, the width of an end gap desired between the end face of the bearing journal and the bottom of the bearing recess, which is connected to the pressure chamber, can be determined.
  • the end gaps of the bearing journals should advantageously be connected to a transverse line by means of at least one line passing through the bearing bush. It has proven to be expedient to let a bore emanate from the bottom of the bearing bush, which bore connects to a sleeve penetrating that gap as part of the line.
  • the pressure supply in the bearing bushes is sealed, but the bearing bushes themselves can be moved radially.
  • the screw pump which is usually designed for lubricating fluids, at a function-critical point - in particular the hydrostatic axial thrust compensation, for example also when pumping water.
  • the specific arrangement of cylindrical bearing bodies or bearing bushes into which the spindles are immersed up to a radial stop serves this purpose.
  • the bearing body or bushing has an axial opening that connects the storage space in which the spindle pin is immersed with the pressure chamber of the pump.
  • the connection of the pressure-carrying connection of the bearing sleeve is designed so that the fluid pressure is effective only on the cross section of the spindle pin. A minimal axial movement across the gap between the spindle and the axial collar can balance the axial thrust and hydraulic relief.
  • the introduction of the pump pressure to compensate for the axial thrust is designed in such a way that the pressure can be concentrated only for the purpose described above.
  • the bearing sleeve should move radially freely, i.e. can continuously adapt to the radial movement of the spindle.
  • a non-positive rotation inhibition for example in the form of an elastic ring element, ensures that the bearing bush does not rotate, since otherwise the necessary seal between the bearing body and the pressure-carrying connection or line would not be provided.
  • the line or the transverse line is connected to an annular space between the pump housing and a tubular housing insert arranged at a distance from the inner surface thereof; this annular space is sealed on the suction side against the interior and is provided with radial openings on the pressure side.
  • a screw pump 10 has in the interior 12 of a pump housing 14 screwed onto a pump base 11 a drive spindle 18 flanked by two sealing or running spindles 16.
  • the sealing or running spindles 16 are mounted on the suction side in a pump cover 20, the drive spindle 18 is connected on the drive side to a coaxial drive shaft journal 22.
  • the drive shaft journal 22 passes through roller bearings 28 arranged in a bearing cover 24 - between a labyrinth ring 25 and a support disk 26 with a downstream lubrication chamber 27. That bearing cover 24 is connected to a drive-side pump cover 31 by means of cylinder screws 29 and with the interposition of a mechanical seal 30, 34, wherein the mechanical seal 30, 34 lies in a seal space 32.
  • a compensating piston 36 surrounded by low-wear shells 35 and provided with roller grooves can be seen on a flange 38. This rests partly in the pump cover 31 and partly in the pump housing 14, the length a of which is approximately 270 mm.
  • a compensating bushing 40 of length n which abuts a shoulder-like shoulder 42 of the spindle 16, is shrunk onto the suction-side bearing journal 17 of the two running spindles 16.
  • This compensating bushing 40 faces with its suction-side end a bearing recess 44 of a bearing body or a bearing bush 46 and forms a control edge there for regulating the hydrostatic pressure.
  • the control edge here lies opposite the edge of a shell 41 seated in the bearing recess 44 and made of particularly wear-resistant material.
  • the length t of the shell 41 is greater than the free length of the bearing journal 17 and thus determines the width of an end gap 48 remaining between the suction-side end face 17 s of the bearing journal 17 and the bottom 45 of the bearing recess 44.
  • An axial inlet bore 50 of the bearing bush opens into this 46; this inlet bore 50 is connected to a channel 54 of the suction-side pump cover 20 by means of a sleeve 53, which has an axial bore 52; the channels 54 of the spindle bearings are connected to one another by a blind bore 56 provided radially in the pump cover 20.
  • FIG. 1 shows that said sleeve 53 bridges a gap space 58 of the 46 one hand, between the suction-side end of the bearing bush and the bottom of a pump cover 20 is formed 60 of a blind recess 58 receiving the same.
  • This gap space 58 is connected via radial bores 59 to a cylindrical extension 13 of the interior 12 of the pump housing 14.
  • an O-ring 62 can be seen as a sealant around the circumference of the bearing bush 46 - other O-rings respectively provided in ring grooves are also designated by 62.
  • the pump housing 14 is designed such that a tubular housing insert 64 of length b of, for example, 190 mm surrounding the spindles 16, 18 rests on both sides of housing ribs 66, 66 s in such a way that an annular space 15 is formed between the housing insert 64 and the pump housing 14 suction-side housing rib 66 s is sealed to the interior 12 by means of an O-ring 62 and has passages 68 in the area of the other housing rib 66. Otherwise, the housing insert 64 is held with its pressure-side edge 64 d between the housing rib 66 and the flange 38.
  • Material inserts 70 made of wear-resistant - preferably ceramic - material are provided between the housing insert 64 and the spindles 16, 18.
  • the material inserts 70 are in themselves disk-like and are provided with receiving bores (not shown for reasons of clarity) for the spindles 16, 18 passing through them.
  • Several of these material inserts 70 are arranged coaxially in the pump housing 14.
  • the material inserts 70 are fixed by means of a plastic layer indicated at 71, which is introduced through bores 72 between the housing insert 64 and the material insert 70.
  • the described annular space 15 is - as can be seen in FIG. 1 - connected to the blind bore 56 of the pump cover 20 by means of an axially parallel longitudinal bore 74 in the pump housing 14.
  • FIG. 2 shows the suction space inlet 76 and - at the deepest of the annular space 15 - the outlet 78; between the two lies that housing insert 64, so that the fluid between the suction chamber inlet 76 and the outlet 78 is forced to flow through the passage 68 of the housing insert 64 into the annular space 15 and over almost the entire length b of the housing insert 64 to the outlet 78.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP90110216A 1989-06-26 1990-05-30 Pompe à rotors hélicoidaux Expired - Lifetime EP0405161B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3920901A DE3920901C2 (de) 1989-06-26 1989-06-26 Schraubenspindelpumpe
DE3920901 1989-06-26

Publications (2)

Publication Number Publication Date
EP0405161A1 true EP0405161A1 (fr) 1991-01-02
EP0405161B1 EP0405161B1 (fr) 1995-12-06

Family

ID=6383607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110216A Expired - Lifetime EP0405161B1 (fr) 1989-06-26 1990-05-30 Pompe à rotors hélicoidaux

Country Status (3)

Country Link
EP (1) EP0405161B1 (fr)
AT (1) ATE131254T1 (fr)
DE (2) DE3920901C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0889240A1 (fr) * 1997-07-04 1999-01-07 Allweiler Ag Pompe à rotors à vis
WO2001034945A1 (fr) * 1999-11-11 2001-05-17 Svenska Rotor Maskiner Ab Machine avec rotors a vis comportant des moyens destines a solliciter axialement au moins un des rotors
EP1132618A3 (fr) * 2000-03-08 2002-07-10 Mario Antonio Morselli Pompe rotative à déplacement positif avec de rotors hélicoidaux
CN104196718A (zh) * 2014-07-29 2014-12-10 苏州通力电气有限公司 螺杆式潜水泵

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4123384C2 (de) * 1991-07-15 1999-08-12 Leistritz Ag Kraftstofförderaggregat
DE102009015685A1 (de) 2009-03-31 2010-10-07 Robert Bosch Gmbh Schraubenspindelpumpenanordnung
CN104179678B (zh) * 2014-07-29 2017-02-08 苏州海而仕信息科技有限公司 一种螺杆式潜水泵
DE102021101111A1 (de) * 2021-01-20 2022-07-21 Netzsch Pumpen & Systeme Gmbh Schraubenspindelpumpe
DE102021113724A1 (de) 2021-05-27 2022-12-01 Jung & Co. Gerätebau GmbH Schraubenspindelpumpe in einflutiger Bauweise

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH268943A (de) * 1947-12-10 1950-06-15 Imo Industri Ab Schraubenpumpe.
US2592476A (en) * 1948-02-07 1952-04-08 Laval Steam Turbine Co Series arrangement of positive and nonpositive screw pumps
US2924181A (en) * 1957-05-13 1960-02-09 Laval Steam Turbine Co Screw pumps or motors
GB1100362A (en) * 1965-03-03 1968-01-24 Imo Industri Ab A hydraulic intermeshing screw pump or motor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE813341C (de) * 1947-12-10 1951-09-10 Imo Industri Ab Schraubenpumpe
DE1192055B (de) * 1957-05-13 1965-04-29 Imo Industri Ab Schraubenpumpe oder -motor
DE2828348A1 (de) * 1978-06-28 1980-01-10 Allweiler Ag Schraubenspindelmaschine
DE3800336A1 (de) * 1988-01-08 1989-07-27 Leistritz Ag Dichtungsfreie pumpe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH268943A (de) * 1947-12-10 1950-06-15 Imo Industri Ab Schraubenpumpe.
US2592476A (en) * 1948-02-07 1952-04-08 Laval Steam Turbine Co Series arrangement of positive and nonpositive screw pumps
US2924181A (en) * 1957-05-13 1960-02-09 Laval Steam Turbine Co Screw pumps or motors
GB1100362A (en) * 1965-03-03 1968-01-24 Imo Industri Ab A hydraulic intermeshing screw pump or motor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0889240A1 (fr) * 1997-07-04 1999-01-07 Allweiler Ag Pompe à rotors à vis
WO2001034945A1 (fr) * 1999-11-11 2001-05-17 Svenska Rotor Maskiner Ab Machine avec rotors a vis comportant des moyens destines a solliciter axialement au moins un des rotors
US6551084B2 (en) 1999-11-11 2003-04-22 Svenska Rotor Maskiner Ab Screw rotor machine having means for axially biasing at least one of the rotors
EP1132618A3 (fr) * 2000-03-08 2002-07-10 Mario Antonio Morselli Pompe rotative à déplacement positif avec de rotors hélicoidaux
EP1921319A3 (fr) * 2000-03-08 2008-06-25 Mario Antonio Morselli Pompe rotative à déplacement positif avec rotors hélicoïdaux
CN104196718A (zh) * 2014-07-29 2014-12-10 苏州通力电气有限公司 螺杆式潜水泵
CN104196718B (zh) * 2014-07-29 2016-10-12 苏州海而仕信息科技有限公司 螺杆式潜水泵

Also Published As

Publication number Publication date
DE3920901A1 (de) 1991-01-03
DE59009942D1 (de) 1996-01-18
DE3920901C2 (de) 1995-02-16
EP0405161B1 (fr) 1995-12-06
ATE131254T1 (de) 1995-12-15

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