EP1588785B1 - Element de tube hélicoidal - Google Patents

Element de tube hélicoidal Download PDF

Info

Publication number
EP1588785B1
EP1588785B1 EP05008464A EP05008464A EP1588785B1 EP 1588785 B1 EP1588785 B1 EP 1588785B1 EP 05008464 A EP05008464 A EP 05008464A EP 05008464 A EP05008464 A EP 05008464A EP 1588785 B1 EP1588785 B1 EP 1588785B1
Authority
EP
European Patent Office
Prior art keywords
helical
flange
tubular body
tube end
tubular member
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.)
Expired - Lifetime
Application number
EP05008464A
Other languages
German (de)
English (en)
Other versions
EP1588785A2 (fr
EP1588785A3 (fr
Inventor
Norbert Heinzle
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.)
Erne Fittings GmbH
Original Assignee
Erne Fittings GmbH
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 Erne Fittings GmbH filed Critical Erne Fittings GmbH
Publication of EP1588785A2 publication Critical patent/EP1588785A2/fr
Publication of EP1588785A3 publication Critical patent/EP1588785A3/fr
Application granted granted Critical
Publication of EP1588785B1 publication Critical patent/EP1588785B1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings

Definitions

  • the invention relates to a coiled tubular element according to the preamble of claim 1.
  • a stator is needed, which is on the one hand coiled more and therefore geometrically complex design, but on the other hand has end-side connections, which has a reliable tightness in pump operation as well as easy mountability for replacement in case of wear.
  • stators for eccentric screw pumps which are provided at the end with a screwed or welded ring, which defines a flange-like pad.
  • stators are on the inside still provided with an inner lining made of rubber or other elastomer, which is pulled without interruption and sealing to the pad.
  • the coiled tube element which is conventionally hammered or pressed, in particular from a tube, by forging action from the outside around an internal shape, has neither straight nor circular end contours.
  • annular connecting elements For a welding or fitting of annular connecting elements to obtain flange-like pads then regularly forming the end portions to include provided with cutting shaping measures before it can be welded or screwed ring parts here. It also arise in the connection area of such rings and security problems at the expense of durability and with the need for special quality controls.
  • the EP 0 344 570 B1 shows the possibility of making coiled tubing without a closure flange by sliding a cylindrical tube over a coiled mandrel.
  • the object of the invention is therefore to provide such a coiled tubular element or its manufacturing process simpler, more cost-effective, with a lower production cost and with an immediately performing quality and strength.
  • a coiled tubular element according to the preamble of claim 1 is designed so that the tubular body consists of a formed by forming a cylindrical tube by a coiled expanding mandrel middle part and at least one flange-shaped tube end.
  • a method for producing a coiled tubular element is further provided, in which a coiled tubular body is integrally formed from an output tube and thereby formed at least one end to form a flange.
  • the shaping of the coiled tubular element according to the invention in one piece, i. with the formation of the pipe end, which offers a flange-like pad, provides the expert with a molding that clearly avoids critical problem areas previously u by welds, screw u. Like. Approaches of patch pipe end parts arise.
  • the integral molding of such a pipe end allows design freedom without geometrically simplified transitional areas with respect to the transition between pipe body and pipe end. Above all, a circular transition region between the pipe body and pipe end is not required.
  • the tubular body can even run with its helical shape with non-circular cross-section to the end of the tube approaching from there as transverse to the longitudinal extension of the tubular body flange from this cross section out.
  • the corresponding manufacturing process is in the field of non-cutting hot and To carry out cold forming, which are usually summarized in the production of the equipment with regard to the spatial arrangement and the processing sequence. Machining that can only be worked out in the sense of precise external dimensions and flat or cylindrical surfaces by means of machining deformation, can be moved to the end of machining to such a tube element.
  • Machining that can only be worked out in the sense of precise external dimensions and flat or cylindrical surfaces by means of machining deformation, can be moved to the end of machining to such a tube element.
  • a machined post-processing of the pipe end to a flat flange and a cylindrical peripheral edge into consideration.
  • Such post-processing is in the sense of a precise fit of such a tubular element in its respective use also of interest when it is about as a stator for eccentric screw pumps lined with an inner layer of elastomeric material, in particular rubber.
  • the elastic layer would then be able to overcome certain shortcomings in the dimensional stability, but this is usually not provided for
  • such a tubular element can be finished with a coiled expanding mandrel according to a method as described in US Pat EP 0 344 570 B1 is described.
  • a method or such a tool creates a coiled tube in a direct operation, in which the basic shape of the helix can be specified with respect to the tube cross-section and helical pitch with the shape of the expansion dome.
  • pipe forming with the help of an expanding dome is not performed in all, but in many cases as hot working, while the shaping of the pipe end in general as cold forming and thus under Waiver of previous warming up of the workpiece can be done.
  • the generally designated 1 in the drawing tube element has a supporting tubular body 2 made of metal, preferably steel, and an inner lining 3 of an elastomeric material, preferably rubber, wherein in any case the inner lining has a substantially uniform wall thickness and with an inner surface 4 a determines non-cylindrical inner shape of the tube, which is important for the function of the tubular element 1 as a stator for progressing cavity pumps.
  • the basic shape of a so delimited interior 5 can be understood from an oval inner cross section out, wherein the oval is formed geometrically from two parallel side sections, connected by mutually opposite semicircles. According to a predetermined helical shape of this oval in the longitudinal extension of the tubular element about a central axis 6 is progressing evenly - helically - twisted, so that in the illustrated longitudinal section in the sectional plane recognizable yielded to each other approximated areas and more distant areas of the inner contour 4.
  • lines 7,8,9 are not to be understood as edges, but only as directional indicators (grinding marks) for the direction of rotation of the imaginary generating oval.
  • the basic form with the double-flighted helix is the most common in stators of progressing cavity pumps, but three or more helices are also possible.
  • the end of the tube body 2 is integrally in a flange-shaped molded tube end 10, which is aligned perpendicular to the longitudinal axis 6.
  • the flange has a defined by machining machining peripheral edge 11 which extends in a circular or cylindrical concentric with the axis 6.
  • the flange in the drawing only slightly protrudes beyond the tubular body, when viewed in the drawing predetermined plane of the longitudinal section, in which the tubular body extends approximately maximally in the direction of the plane of the drawing.
  • the flange-like tube end 10 emerges without breakage and without joints from the tubular body 2, ie in particular can dispense with thread cuts or welds, which not only in terms of a simplified production, but also a robust and uniform embodiment with good strength characteristics is beneficial. It is obviously unnecessary to create an adaptive intermediate region between the tubular body 2 and the pipe end 10, as is regularly required when fitting separate parts. Rather, the pipe end 10 is in its flange shape directly from the non-cylindrical helical shape with an extremely short transition region 12th
  • the tubular body 2 is preferably formed by forming a cylindrical tube by means of an expanding mandrel which provides a rapid and precise molding process. While such a molding process using a ram dome is most often performed as hot working, the subsequent forming of the pipe end to the flange shape can generally be in the "cold" state, which not only saves the workpiece from heating up, but also facilitates handling.
  • the metallic tubular body 2 together with the tube end 10 is completed before the inner lining 3 is applied.
  • This completion then also includes machining for the cylindrical rim 11 and may also normally include reworking an end face 13 of the flange with metal-removing means if it does not already have a sufficiently smooth and precise surface during forming, say in a die Has.
  • the inner lining 3 is subsequently produced in a casting or injection mold. This then covers the tubular body 2 on the inside continuously and seamlessly and is also still end detox in one piece to the edge 11 of the pipe end 10 continues.
  • the inner lining 3 forms the end face 14, which is particularly important for termination and sealing tasks, and is provided at the transition of this end face 14 to the inner contour 4 with an edge 15 which consistently reproduces the boundary line between the coiled inner shape of the tubular element 1 and the flat end face 14 underlying supporting and supporting metallic Tube body 2 in the transition region 12 reveals fillets.
  • the coiled tube element 1 which is shown with only one end, extends approximately as a stator for eccentric screw pumps, for example, over the length of 250 mm and is usually provided on the other side with a corresponding pipe end, so that it easily replaceable with the help Clamping screws or clamping claws can be clamped in a motor-pump unit.
  • a stator for eccentric screw pumps, for example, over the length of 250 mm and is usually provided on the other side with a corresponding pipe end, so that it easily replaceable with the help Clamping screws or clamping claws can be clamped in a motor-pump unit.
  • a stator is designed for cooperation with a rotor which has a circular-cylindrical cross-section but is wound around an axis which coincides with the axis 6 of the stator during installation, the circular cross-section of the rotor sections einschmiegt in one and the other of the two end portions of the oval inner cross section of the stator.
  • the rotor By rotation, the rotor creates in the longitudinal direction wandemde hollow chambers for the pumping action of the pump.
  • This well-known and widespread design of a pump for particular abrasive or difficult media can be made easier and more robust according to the invention with a one-piece stator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Endoscopes (AREA)
  • External Artificial Organs (AREA)

Claims (11)

  1. Elément de tube hélicoïdal (1), en particulier stator pour pompes à vis excentrée, avec un corps de tube (2) porteur en métal et une surface de raccordement (13, 14) de type bride, plane, périphérique, orientée de manière essentiellement transversale à l'extension longitudinale du corps de tube (2) au niveau d'au moins une des deux extrémités frontales de l'élément de tube (1), caractérisé en ce que le corps de tube est constitué d'une partie médiane formée par formage d'un tube cylindrique par un mandrin d'évasement hélicoïdal et d'au moins une extrémité de tube (10) formée à la manière d'une bride.
  2. Elément de tube hélicoïdal (1) selon la revendication 1, caractérisé en ce que le corps de tube (2) se transforme en une extrémité de tube (10) sans section intermédiaire cylindrique.
  3. Elément de tube hélicoïdal (1) selon la revendication 1 ou 2, caractérisé en ce que l'extrémité de tube (10) forme une bride à bord périphérique circulaire (11).
  4. Elément de tube hélicoïdal selon la revendication 1, 2 ou 3, caractérisé en ce que l'extrémité de tube présente des zones de bride uniquement au niveau de la périphérie.
  5. Elément de tube hélicoïdal (1) selon l'une quelconque des revendications 1 à 4 avec un revêtement intérieur (3) en caoutchouc ou en autre matériau élastomère, caractérisé en ce que le revêtement intérieur (3) se poursuit sous forme d'habillage frontal de l'extrémité de tube (10).
  6. Elément de tube hélicoïdal (1) selon la revendication 5, caractérisé en ce que le corps de tube (2) passe avec des passages courts (12) d'une forme de tube hélicoïdale à une forme de bride plane de l'extrémité de tube (10), le revêtement intérieur (3) est cependant adjacent à la surface frontale plane (14) de l'habillage de l'extrémité de tube (10) en formant une arête le long d'une ligne de séparation (15).
  7. Elément de tube hélicoïdal (1) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le corps de tube (2) est constitué d'une partie médiane formée à l'aide d'un mandrin d'évasement hélicoïdal à partir d'un tube cylindrique et d'au moins une extrémité de tube (10) de type bride formée à froid.
  8. Procédé de fabrication d'un élément de tube hélicoïdal selon l'une quelconque des revendications 1 à 6 respectivement d'un corps de tube selon la revendication 7, caractérisé en ce qu'un corps de tube (2) hélicoïdal est réalisé d'un seul tenant à partir d'un tube de sortie cylindrique par formage et formé en une bride (10) au niveau d'au moins une extrémité.
  9. Procédé selon la revendication 8, caractérisé en ce que la réalisation du corps de tube (2) hélicoïdal et le formage en bride de l'extrémité de tube (10) se font dans des étapes séparées.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que le corps de tube est formé à l'aide d'un mandrin hélicoïdal.
  11. Procédé selon la revendication 8, 9 ou 10, caractérisé en ce que le formage en bride est un formage à froid.
EP05008464A 2004-04-20 2005-04-19 Element de tube hélicoidal Expired - Lifetime EP1588785B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004019698A DE102004019698B4 (de) 2004-04-20 2004-04-20 Gewendeltes Rohrelement
DE102004019698 2004-04-20

Publications (3)

Publication Number Publication Date
EP1588785A2 EP1588785A2 (fr) 2005-10-26
EP1588785A3 EP1588785A3 (fr) 2005-11-02
EP1588785B1 true EP1588785B1 (fr) 2010-03-17

Family

ID=34935347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05008464A Expired - Lifetime EP1588785B1 (fr) 2004-04-20 2005-04-19 Element de tube hélicoidal

Country Status (3)

Country Link
EP (1) EP1588785B1 (fr)
AT (1) ATE461001T1 (fr)
DE (2) DE102004019698B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106999881A (zh) * 2014-10-07 2017-08-01 捷通国际有限公司 个人配制装置
DE102014116327A1 (de) 2014-11-10 2016-05-12 Netzsch Pumpen & Systeme Gmbh Verfahren zur Herstellung eines gewendelten Stators und Vorrichtung zur Herstellung eines gewendelten Stators

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653899A1 (de) * 1967-08-12 1971-09-30 Seeberger Kg Maschinen Und Ger Schneckenpumpe
DE2713468C3 (de) * 1977-03-26 1982-09-02 Allweiler Ag, 7760 Radolfzell Stator für Exzenterschneckenpumpen
US4951493A (en) * 1988-05-30 1990-08-28 Siekmann Fittings Gmbh & Co. Kg Method and apparatus for making a spiral pipe
DE4121717C2 (de) * 1991-06-07 1995-01-26 Allweiler Ag Schneckenpumpe, insbesondere Exzenterschneckenpumpe
DE19602137A1 (de) * 1995-01-23 1996-08-08 Andrej Nikolaevic Frolov Verfahren und Vorrichtungen zur Herstellung von Rohren mit profilierter Wand (gaufrierten Rohren)
DE19757734C2 (de) * 1997-12-23 2000-09-14 Bug Betriebs & Grundbesitz Verfahren und Mischer zum Herstellen farbiger Mörtelmassen
DE19804259A1 (de) * 1998-02-04 1999-08-12 Artemis Kautschuk Kunststoff Elastomerstator für Exzenterschneckenpumpen
DE19950257B4 (de) * 1999-10-18 2013-01-17 Wilhelm Kächele GmbH Elastomertechnik Exzenterschneckenpumpe mit vollausgekleidetem Stator

Also Published As

Publication number Publication date
EP1588785A2 (fr) 2005-10-26
DE102004019698A1 (de) 2005-11-24
DE502005009219D1 (de) 2010-04-29
DE102004019698B4 (de) 2010-06-10
EP1588785A3 (fr) 2005-11-02
ATE461001T1 (de) 2010-04-15

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