EP0358789A1 - Stator pour pompe à vis excentrique - Google Patents

Stator pour pompe à vis excentrique Download PDF

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Publication number
EP0358789A1
EP0358789A1 EP88114967A EP88114967A EP0358789A1 EP 0358789 A1 EP0358789 A1 EP 0358789A1 EP 88114967 A EP88114967 A EP 88114967A EP 88114967 A EP88114967 A EP 88114967A EP 0358789 A1 EP0358789 A1 EP 0358789A1
Authority
EP
European Patent Office
Prior art keywords
stator
inner part
thread
stator casing
casing
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Withdrawn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
EP88114967A
Other languages
German (de)
English (en)
Inventor
Helmut Miller
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.)
FOREG AG
Original Assignee
FOREG 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 FOREG AG filed Critical FOREG AG
Priority to EP88114967A priority Critical patent/EP0358789A1/fr
Publication of EP0358789A1 publication Critical patent/EP0358789A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04C2/1073—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 where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member

Definitions

  • the invention relates to a stator for eccentric screw pumps according to the preamble of claim 1.
  • the object on which the invention is based is to create a simple and permanent connection between the stator casing and the inner part, with partial or complete removal of the connection being excluded during operation.
  • connection can be made by connecting the stator casing and the inner part by means of the thread fix part in a very simple manner by the inner thread of the fixed stator sheath tapers somewhat towards the pressure side, while the external thread of the elastic inner part is left cylindrical in the unloaded state, i.e. not screwed into the stator sheath.
  • the inner part By screwing the inner part into the stator casing, the inner part is increasingly under radial prestress from the suction side to the pressure side, the conicity of the internal thread on the stator casing being selected depending on the type of pump and application so that the increasing pressure towards the pressure side of the pump from the inner part is caught. This enables much better pump delivery rates to be achieved in a very simple manner.
  • the depth and pitch of the thread between the stator casing and the inner part can be largely freely selected, which means that the manufacturing costs and strength of the connection can be selected individually.
  • the pitch of the thread is small compared to the pitch of the screw thread of the pump. According to claim 4, it is preferably between 1/3 and 1/10 of the pitch of the worm thread.
  • the conical taper of the thread is preferably between about 0.5 ° and about 3 ° with respect to the central axis of the stator, the best results being achieved. In principle, gradients outside this range are also possible in special applications.
  • the thread between the stator casing and the inner part can be both single-start and, in an advantageous embodiment according to claim 6, multi-start, as a result of which the manufacture and achievable strength can be varied.
  • the stator jacket is made of stainless steel, and an extraordinary strength and pressure load can be achieved.
  • stator sheath from plastic, in particular impact-resistant but elastic plastic.
  • This embodiment is particularly inexpensive to manufacture and its stability is sufficient for many applications.
  • FIG. 1 shows a partial radial section through the stator consisting of the stator casing and inner part in the upper half and a partial radial section through the stator casing with the inner part removed.
  • the stator shown in the figure has a stator jacket 10 made of impact-resistant but elastic plastic, which carries an internal thread 12.
  • an external thread 14 is one elastic material, such as rubber, existing inner part 16 screwed.
  • the pitches of the two threads 12 and 14 match.
  • the inside of the inner part 16 has, in a manner customary in eccentric screw pumps, a screw thread 18 which interacts with a rotor (not shown) inside the stator.
  • the conveying direction of the worm thread 18 together with the rotor, not shown, runs in the direction of the arrow 20.
  • the clear width a of the internal thread 12 on the suction side 20 of the stator decreases conically to a value b on the pressure side 24 of the stator jacket 10.
  • This slight taper of approximately 1 ° with respect to the central axis 26 of the stator also becomes due to the elasticity of the inner part 16 the external thread of the same when the inner part is screwed into the stator jacket 10.
  • the external thread 14 of the same does not run conically, but rather cylindrically.
  • the bias of the inner part 16 therefore increases from the suction side 22 to the pressure side 24 of the stator.
  • a steel tube 30 embedded in the surface of the stator casing 10 is drawn onto the outer surface of the stator casing 10, which increases the radial strength of the stator, which is particularly expedient if the stator casing 10 is made of plastic or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP88114967A 1988-09-14 1988-09-14 Stator pour pompe à vis excentrique Withdrawn EP0358789A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP88114967A EP0358789A1 (fr) 1988-09-14 1988-09-14 Stator pour pompe à vis excentrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88114967A EP0358789A1 (fr) 1988-09-14 1988-09-14 Stator pour pompe à vis excentrique

Publications (1)

Publication Number Publication Date
EP0358789A1 true EP0358789A1 (fr) 1990-03-21

Family

ID=8199304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114967A Withdrawn EP0358789A1 (fr) 1988-09-14 1988-09-14 Stator pour pompe à vis excentrique

Country Status (1)

Country Link
EP (1) EP0358789A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2255594A (en) * 1990-12-20 1992-11-11 Drilex Syst Inc Downhole drilling motor.
WO1993024742A1 (fr) * 1992-05-22 1993-12-09 Bodema, S.L. Machine pour l'extraction de l'huile usee du carter de vehicules automobiles
EP1693571A3 (fr) * 2005-01-12 2006-10-04 Dyna-Drill Technologies Inc. Stator élastomère multi-couche de pompe à cavité progressive
US9393648B2 (en) 2010-03-30 2016-07-19 Smith International Inc. Undercut stator for a positive displacment motor
EP3767105A1 (fr) * 2019-07-16 2021-01-20 Arnold Jäger Holding GmbH Stator pour une pompe à vis sans fin excentrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528978A1 (de) * 1964-10-29 1969-07-17 Continental Gummi Werke Ag Pumpe mit schraubenfoermig ausgebildetem Rotor und Stator
FR1592149A (fr) * 1967-11-02 1970-05-11
US3802803A (en) * 1971-10-13 1974-04-09 A Bogdanov Submersible screw pump
DE3147663A1 (de) * 1981-12-02 1983-06-09 Gummi-Jäger KG GmbH & Cie, 3000 Hannover Stator fuer schneckenpumpen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528978A1 (de) * 1964-10-29 1969-07-17 Continental Gummi Werke Ag Pumpe mit schraubenfoermig ausgebildetem Rotor und Stator
FR1592149A (fr) * 1967-11-02 1970-05-11
US3802803A (en) * 1971-10-13 1974-04-09 A Bogdanov Submersible screw pump
DE3147663A1 (de) * 1981-12-02 1983-06-09 Gummi-Jäger KG GmbH & Cie, 3000 Hannover Stator fuer schneckenpumpen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2255594A (en) * 1990-12-20 1992-11-11 Drilex Syst Inc Downhole drilling motor.
GB2255594B (en) * 1990-12-20 1994-07-20 Drilex Syst Inc Downhole drilling motor
WO1993024742A1 (fr) * 1992-05-22 1993-12-09 Bodema, S.L. Machine pour l'extraction de l'huile usee du carter de vehicules automobiles
EP1693571A3 (fr) * 2005-01-12 2006-10-04 Dyna-Drill Technologies Inc. Stator élastomère multi-couche de pompe à cavité progressive
US7517202B2 (en) 2005-01-12 2009-04-14 Smith International, Inc. Multiple elastomer layer progressing cavity stators
US9393648B2 (en) 2010-03-30 2016-07-19 Smith International Inc. Undercut stator for a positive displacment motor
EP3767105A1 (fr) * 2019-07-16 2021-01-20 Arnold Jäger Holding GmbH Stator pour une pompe à vis sans fin excentrique
WO2021009275A1 (fr) * 2019-07-16 2021-01-21 Arnold Jäger Holding GmbH Stator pour pompe à vis sans fin excentrique

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