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EP0865575A1 - Double worm system - Google Patents

Double worm system

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Publication number
EP0865575A1
EP0865575A1 EP96920676A EP96920676A EP0865575A1 EP 0865575 A1 EP0865575 A1 EP 0865575A1 EP 96920676 A EP96920676 A EP 96920676A EP 96920676 A EP96920676 A EP 96920676A EP 0865575 A1 EP0865575 A1 EP 0865575A1
Authority
EP
European Patent Office
Prior art keywords
screw
balancing
pct
hollows
worm
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
EP96920676A
Other languages
German (de)
French (fr)
Other versions
EP0865575B9 (en
EP0865575B2 (en
EP0865575B1 (en
Inventor
Ulrich Becher
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.)
Ateliers Busch SA
Original Assignee
Ateliers Busch SA
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
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Application filed by Ateliers Busch SA filed Critical Ateliers Busch SA
Publication of EP0865575A1 publication Critical patent/EP0865575A1/en
Application granted granted Critical
Publication of EP0865575B1 publication Critical patent/EP0865575B1/en
Publication of EP0865575B2 publication Critical patent/EP0865575B2/en
Publication of EP0865575B9 publication Critical patent/EP0865575B9/en
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
    • F04C2/12—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
    • 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 measures for balancing a set of twin screws in an axially parallel arrangement with opposing external-axis engagement and with wrap angles of at least 720 ° in a single-row design. Center of gravity, end face and wrap angle determine the sizes of the static and dynamic imbalance that occur with screws with catchy profiles.
  • the invention has for its object to define measures for the balancing of single-start screws, the geometry of which is unusual or the use of which requires special materials, without great additional expenditure in production and without endangering the dimensional stability.
  • twin screw set 1, 2 (FIG. 1) in an axially parallel arrangement with opposing external axis engagement and wrap angles of at least 720 ° solved by the fact that the screw lengths are not fixed to integer multiples of the pitch and that the outer screw contours in the medium entry area for balancing 3 (Fig.l) are changed.
  • Design options are provided by attaching additional masses 6 (FIG. 1) in the outer area, in particular on the pilot transmission, and by balancing cavities 4 (FIG. 2) on the end face, the axial extent of which is varied for optimization.
  • Fig.l A twin screw set for a screw pump in single-thread design according to the invention with wrap angles of 1598 ° and balancing recesses on the outer screw contours in the medium entry area.
  • Fig. 2 An embodiment of a twin screw set from Fig.l with balancing cavity in front view.
  • Fig.3 The representation of the spiral profile center of gravity locus of a screw profile of Fig.2.
  • the twin screws 1, 2 (FIG. 1) have lengths of 4.439 times the pitch, which corresponds to a wrap angle of 1598 ° (FIG. 3).
  • the end profile 5 (FIG. 2) and the slope 1 (FIG. 1) together with the wall thickness d (FIG. 2) determine the largest part of the contour of the axially attached balancing cavities 4 (FIG. 2); the core circle 7 (FIG. 2) delimits this towards the center. If the center of gravity of the full profile and the balancing surface So, S 3 (FIG. 2) have common angular positions, the straight termination in the balancing surface inevitably results.
  • the center of gravity So (Fig. 3) is positioned on the u-axis in a right-angled coordinate system with screw axis as w-axis and u-axis and v-axis in the plane of the central screw face section.
  • Equation (V) returns for any
  • Screw wrap angle 20.2 (with 02> 2 ⁇ ) at least one solution for ⁇ x ⁇ ;
  • the dimensions of the balancing cavity follow from ⁇ i and ⁇ 2: from (III) the wrap angle and from (VI) the nominal cross-section g 3 .
  • the wrap angle 0 3 of the balancing cavity should be as small as possible; the largest value with ⁇ i ⁇ 0: 2 is used for several solutions for ⁇ i.
  • outer balancing masses 6 (FIG. 1) are used in the area of the pilot transmission.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Golf Clubs (AREA)
  • Gear Transmission (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Fodder In General (AREA)
  • Clamps And Clips (AREA)
  • Body Structure For Vehicles (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Catalysts (AREA)
  • Hybrid Cells (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Valve Device For Special Equipments (AREA)
  • Retarders (AREA)

Abstract

PCT No. PCT/CH96/00250 Sec. 371 Date Feb. 8, 1999 Sec. 102(e) Date Feb. 8, 1999 PCT Filed Jul. 8, 1996 PCT Pub. No. WO97/21925 PCT Pub. Date Jun. 19, 1997In prior art designs, single-flight cast double worms with angles of contact >720 DEG with large balance hollows at both ends and worm lengths of whole multiples of the pitch operate in the medium rotation speed ranges ( DIFFERENCE 3000 min DIFFERENCE 1) without imbalance. The desired use of special uncastable materials and the manufacturing complexity and the necessary dimensional stability even for extreme profile geometries pose additional problems in balancing which are solved by the present invention. Here, it is possible, by varying the angle of contact of the worm and any balance hollows and/or by altering the contour of the worms in the medium engagement region, to reduce the size of the balance hollows, sometimes to "zero", and with the possible use of additional masses. Besides the advantage of simple raw component manufacture, worms balanced in this way also permit the use of special materials and extreme worm geometries for fitting in pumps used in the chemical, medical and food sectors.

Description

Zwi11inσsschraubensatz Twin screw set
Die Erfindung betrifft Maßnahmen zur Auswuchtung eines Zwillingsschraubensatzes in achsparalleler Anordnung mit gegenläufigem auβenachsigen Eingriff sowie mit Umschlingungswinkeln von mindestens 720° in eingängiger Ausführung. Schwerpunkt mittenabstand, Stirnfläche und Umschlingungswinkel bestimmen hierbei die Größen der statischen und der dynamischen Unwucht, die bei Schrauben mit eingängigen Profilen auftreten.The invention relates to measures for balancing a set of twin screws in an axially parallel arrangement with opposing external-axis engagement and with wrap angles of at least 720 ° in a single-row design. Center of gravity, end face and wrap angle determine the sizes of the static and dynamic imbalance that occur with screws with catchy profiles.
In der Offenlegungschrift Sho 62 (1987)-291486 der Fa. Taiko, Japan, wird eine Methode zur Schraubenauswuchtung beschrieben: Zunächst wird statische Auswuchtung erreicht durch Festsetzen der Schraubenlänge auf ganzzahlige Vielfache der Steigung. Durch beidseitig stirnseitige Aussparungen in der Schraube, die hohl oder mit leichtem Material gefüllt sind, wird dynamisch ausgewuchtet.In the publication Sho 62 (1987) -291486 from Taiko, Japan, a method for screw balancing is described: First, static balancing is achieved by setting the screw length to integer multiples of the pitch. Due to recesses on both sides in the screw, which are hollow or filled with light material, dynamic balancing is carried out.
Diese Methode der Auswuchtung ist nicht durchführbar, wenn Sonderwerkstoffe verlangt werden, die nicht gegossen werden können. Auch bei außergewöhnlichen Profilgeometrien hat diese Methode ihre Grenzen, da einerseits die Wandstärken der Schrauben aus Stabilitätsgründen nicht beliebig verringert werden können, andererseits eine zu große axiale Ausdehnung der Auswuchthöhlen wegen der spiraligen Form erhebliche Fertigungsprobleme mit sich bringt.This method of balancing is not feasible if special materials are required that cannot be cast. Even with unusual profile geometries, this method has its limits, because on the one hand the wall thicknesses of the screws cannot be reduced arbitrarily for reasons of stability, and on the other hand an excessive axial expansion of the balancing cavities causes considerable manufacturing problems due to the spiral shape.
Der Erfindung liegt die Aufgabe zugrunde, Maßnahmen zu definiern zur Auswuchtung eingängiger Schrauben, deren Geometrie außergewöhnlich ist oder deren Einsatz Sonderwerkstoffe fordert, ohne großen Mehraufwand in der Fertigung und ohne Gefährdung der Formstabilität.The invention has for its object to define measures for the balancing of single-start screws, the geometry of which is unusual or the use of which requires special materials, without great additional expenditure in production and without endangering the dimensional stability.
Diese Aufgabe wird bei einem Zwillingsschraubensatz l, 2 (Fig.l) in achsparalleler Anordnung mit gegenläufigem außenachsigem Eingriff sowie Umschlingungswinkeln von mindestens 720° in eingängiger Ausführung erfindungsgemäß dadurch gelöst, daß die Schraubenlängen nicht auf ganzzahlig Vielfache der Steigung fixiert sind und daß die Schraubenaußenkonturen im Medium-Eintrittsbereich zur Auswuchtung 3 (Fig.l) verändert sind.This object is achieved according to the invention with a twin screw set 1, 2 (FIG. 1) in an axially parallel arrangement with opposing external axis engagement and wrap angles of at least 720 ° solved by the fact that the screw lengths are not fixed to integer multiples of the pitch and that the outer screw contours in the medium entry area for balancing 3 (Fig.l) are changed.
Ausgestaltungsmöglichkeiten sind durch Anbringen von Zusatzmassen 6 (Fig.l) im Auβenbereich, insbesondere am Pilotgetriebe sowie durch stirnseitige Answuchthöhlen 4 (Fig.2) gegeben, deren axiale Ausdehung zur Optimierung variiert wird.Design options are provided by attaching additional masses 6 (FIG. 1) in the outer area, in particular on the pilot transmission, and by balancing cavities 4 (FIG. 2) on the end face, the axial extent of which is varied for optimization.
Die mit der Erfindung erzielten Vorteile sind :The advantages achieved with the invention are:
1. Leichtere Fertigung und größere Formstabilität im Falle der Anbringung von stirnseitigen Auswuchthöhlen, erreicht durch optimale Dimensionierung von Schraubenumschlingungs-winkel, Auswuchthöhlenumschlingungswinkel sowie Auswuchthöhlenguerschnitt.1. Easier manufacture and greater dimensional stability in the case of frontal balancing cavities, achieved by optimal dimensioning of the screw wrap angle, balancing cavity wrap angle and balancing cross-section.
2. Möglichkeit der Verwendung von Sonderwerkstoffen, die nicht gegossen werden können.2. Possibility of using special materials that cannot be cast.
3. Reduzierte Schraubenoberflächen im Ausgangsbereich, was eine Temperaturreduzierung bewirkt.3. Reduced screw surfaces in the exit area, which causes a temperature reduction.
Anhand eines in den Abbildungen dargestellten Ausführungs¬ beispiels wird die Erfindung anschließend näher erläutert :The invention is subsequently explained in more detail using an exemplary embodiment shown in the figures:
Es zeigen :Show it :
Fig.l: Einen Zwillingsschraubensatz für eine Schraubenpumpe in eingängiger Ausführung nach der Erfindung mit Umschlingungswinkeln von 1598° und Auswuchtausnehmungen an den Schraubenaußenkonturen im Medium-Eintrittsbereich.Fig.l: A twin screw set for a screw pump in single-thread design according to the invention with wrap angles of 1598 ° and balancing recesses on the outer screw contours in the medium entry area.
Fig.2: Ein Ausführungsbeispiel eines Zwillingsschrauben¬ satzes von Fig.l mit Auswuchthöhle in Stirnansicht.Fig. 2: An embodiment of a twin screw set from Fig.l with balancing cavity in front view.
Fig.3: Die Darstellung der spiraligen Profilschwerpunkt- Ortskurve eines Schraubenprofils von Fig.2. In einem Ausführungsbeispiel weisen die Zwillingsschrauben 1, 2 (Fig.l) Längen vom 4,439-fachen der Steigung auf, was einem Umschlingungswinkel von 1598° entspricht (Fig.3). Das Stirnprofil 5 (Fig.2) sowie die Steigung 1 (Fig.l) bestimmen zusammen mit der Wandstärke d (Fig.2) den größten Teil der Kontur der axial angebrachten Auswuchthöhlen 4 (Fig.2); der Kernkreis 7 (Fig.2) begrenzt diese nach dem Zentrum hin. Bei gemeinsamen Winkelpositionen der Schwerpunkte von Vollprofil und Auswuchtfläche So, S3 (Fig.2) ergibt sich der gerade Abschluß in der Auswuchtfläche zwangsläufig.Fig.3: The representation of the spiral profile center of gravity locus of a screw profile of Fig.2. In one exemplary embodiment, the twin screws 1, 2 (FIG. 1) have lengths of 4.439 times the pitch, which corresponds to a wrap angle of 1598 ° (FIG. 3). The end profile 5 (FIG. 2) and the slope 1 (FIG. 1) together with the wall thickness d (FIG. 2) determine the largest part of the contour of the axially attached balancing cavities 4 (FIG. 2); the core circle 7 (FIG. 2) delimits this towards the center. If the center of gravity of the full profile and the balancing surface So, S 3 (FIG. 2) have common angular positions, the straight termination in the balancing surface inevitably results.
Rechnerisch wird das Problem wie folgt behandelt:The problem is dealt with as follows:
In einem rechtwinkligen Koordinatensystem mit Schraubenachse als w-Achse und u-Achse und v-Achse in der Ebene des mittleren Schraubenstirnschnitts wird der Schwerpunkt So (Fig.3) auf der u-Achse positioniert. Die Ausdehnung der Schraube in w- Richtung erstreckt sich symmetrisch von -W2...+W2 oder in Winkeldefinition von -0.2...+0.2, bei einer Beziehung 0:2 = (2π/l)-W2 (II) , wobei 2ct2 der Umschlingungswinkel der Schraube und π = Kreiszahl = 3,1415... bedeuten.The center of gravity So (Fig. 3) is positioned on the u-axis in a right-angled coordinate system with screw axis as w-axis and u-axis and v-axis in the plane of the central screw face section. The expansion of the screw in the w direction extends symmetrically from -W2 ... + W 2 or in an angular definition from -0.2 ... + 0.2, with a relationship of 0: 2 = (2π / l) -W 2 (II) , where 2ct 2 is the wrap angle of the screw and π = number of circles = 3.1415 ...
Die Bereiche der stirnseitigen Auswuchthöhlen sind bei -W2...- Wi und + WJ....+ W2, was Winkelpositionen von -α2...-αι und +αι.,.-κx2 mit αχ= (2π/l)-Wι (I) entspricht.The areas of the front balancing cavities are at -W2 ...- Wi and + W J .... + W 2 , which indicate angular positions of -α 2 ...- αι and + αι., .- κx2 with αχ = (2π / l) -Wι (I) corresponds.
Die jeweiligen Umschlingungswinkel einer Auswuchthöhle betragen also 0-3 = 0-2-αι (III) .The respective angle of wrap a balancing hollow therefore be 0- 3 = 0-2 αι (III).
Bei symmetrischen Auswuchthöhlen mit einem konstanten Wert g3 des Produktes aus Fläche f3 und Schwerpunktmittenabstand r3 (Fig.2) (g3 = f3 • r3 = Konstant (IV) ) führen die Forderungen nach statischer und dynamischer Auswuchtung zu den Formeln 0.2 • sinαi cosα2β αi • cosαi sinα2 (V) undIn the case of symmetrical balancing cavities with a constant value g 3 of the product of area f 3 and center of gravity distance r 3 (Fig. 2) (g 3 = f 3 • r 3 = constant (IV)), the requirements for static and dynamic balancing lead to the formulas 0.2 • sinαi cosα2 β αi • cosαi sinα2 (V) and
93 = go-(sino-2-o.2Cθsα2) / (sinα2-sinαι-α2Cθsα2-κxicosαι) (VI), wobei go das Produkt aus Vollprofilfläche fo und zugehörigem Schwerpunktmittenabstand ro (Fig.2) bedeutet, 0.2 und αi im Bogenmaß einzusetzen sind und g3 der oben stehenden Definition entspricht.93 = go- (sino-2-o.2Cθsα2) / (sinα2-sinαι-α2Cθsα2-κxicosαι) (VI), where go is the product of the full profile surface fo and associated Center of gravity center distance ro (Fig. 2) means that 0.2 and αi must be used in radians and g 3 corresponds to the definition above.
Gleichung (V) liefert für jeden beliebigenEquation (V) returns for any
Schraubenumschlingungswinkel 20.2 (mit 02 > 2π) mindestens eine Lösung für <xχ; aus αi und α2 folgen die Abmessungen der Auswuchthöhle: Aus (III) der Umschlingungswinkel und aus (VI) der Soll-Querschnitt g3.Screw wrap angle 20.2 (with 02> 2π) at least one solution for <xχ; The dimensions of the balancing cavity follow from αi and α2: from (III) the wrap angle and from (VI) the nominal cross-section g 3 .
Aus Fertigungsgründen soll der Umschlingungswinkel 03 der Auswuchthöhle möglichst klein sein; es wird bei mehreren Lösungen für αi also der größte Wert mit αi < 0:2 eingesetzt. Genaue Untersuchungen zeigen, daß die ungünstigsten Verhältnisse bei Schraubenlängen von ganzzahligen vielfachen der Steigung auftreten, bei 2W2 = 2L, 3L, 4L, 5L ... K-L, entsprechend der Ausführung gemäß o.a. Offenlegungsschrift: Der Auswuchthöhlenumschlingungswinkel beträgt dort 0.3 — π, der Dynamik-Kennwert g3 erreicht ein Maximum, was eine maximale Auswuchthöhle erfordet : g3, Max = g0 • k/(2k-l) d.h. für eine Schraubenlänge der 4- fachen Steigung wird dort g3 = go • 4/7.For manufacturing reasons, the wrap angle 0 3 of the balancing cavity should be as small as possible; the largest value with αi <0: 2 is used for several solutions for αi. Exact investigations show that the most unfavorable ratios occur with screw lengths of integer multiples of the pitch, with 2W2 = 2L, 3L, 4L, 5L ... KL, according to the design according to the above publication: The balancing loop wrap angle there is 0. 3 - π, the Dynamic characteristic value g 3 reaches a maximum, which requires a maximum balancing cavity: g 3 , Max = g 0 • k / (2k-l) ie for a screw length of 4 times the pitch, g 3 = go • 4/7.
Für die Ausführung der hier beschriebenen Erfindung werden Schrauben mit Umschlingungswinkeln von 20.2 — 5π, 7π, 9π... entsprechend Schraubenlängen von 2W2 = 51/2, 71/2, 91/2 gewählt.For the implementation of the invention described here, screws with wrap angles of 20. 2 - 5π, 7π, 9π ... corresponding to screw lengths of 2W 2 = 51/2, 71/2, 91/2 are selected.
Die Auswuchthöhlenumschlingungswinkel sind dann er nfalls 0.3 = π, der Dynamik-Kennwert g3 erreicht hier jedoch ein Minimum, was eine minimale Auswuchthöhle bedeuted : g3, Min = go/2The balancing wrap angle is then 0. 3 = π, but the dynamic characteristic value g 3 reaches a minimum here, which means a minimum balancing cavity: g 3 , Min = go / 2
Verstärkungsrippen am Ende der Auswuchthöhlen führen zu asymmetrischen Verhältnissen, die teilweise durch Korrektur der Umschlingungswinkel 20.2, 03 aufgefangen werden. Als weitere Maßnahme zur Auswuchtung werden die Schrauben 1, 2 an den passiven Außenkonturteilen an der Saugseite verändert. Der Passivbereich 3 (Fig.l) erstreckt sich bei beiden Schrauben über alle Teile, die weder zur Bildung der ersten saugseitigen Arbeitszelle noch zur Aufrechterhaltung der Stabilität erforderlich sind. Diese äußere Auswuchtung kann alternativ oder in Kombination mit einer oder mehreren stirnseitigen Auswuchthöhlen eingesetzt werden.Reinforcing ribs at the end of the balancing cavities lead to asymmetrical conditions, which are partially compensated for by correcting the wrap angles 20.2, 0 3 . As a further measure for balancing, the screws 1, 2 on the passive outer contour parts on the suction side are changed. The passive area 3 (Fig.l) extends with both screws over all parts that are neither necessary to form the first suction-side work cell nor to maintain stability. This external balancing can be used alternatively or in combination with one or more end balancing cavities.
In einer Untervariante werden äußere Auswuchtmassen 6 (Fig.l) im Bereich des Pilotgetriebes eingesetzt. In a sub-variant, outer balancing masses 6 (FIG. 1) are used in the area of the pilot transmission.

Claims

Patentansprüche claims
1. Zwillingsschraubensatz für Schraubenpumpe in achsparalleler Anordnung mit gegenläufigem außenachsigem Eingriff sowie mit Umschlingungswinkeln von mindestens 720° in eingängiger Ausführung ohne oder mit Auswuchthöhlen in den Enden, dadurch gekennzeichnet, daß die Schraubenlängen kein ganzzahlig vielfaches der Steigung sind und/oder daß die Schraubenaußenkonturen im Medium-Eintrittsbereich zur Auswuchtung verändert sind.1.Twin screw set for screw pump in an axially parallel arrangement with opposing external axis engagement and with wrap angles of at least 720 ° in a single-handed version without or with balancing cavities in the ends, characterized in that the screw lengths are not an integral multiple of the pitch and / or that the outer screw contours in the medium - Entry area for balancing are changed.
2. Zwillingsschraubensatz nach Anspruch 1, dadurch gekennzeichnet, daß die Schraubenlänge um ganzzahlig vielfache der Steigung größer ist als das 1%- fache der Steigung.2. Set of twin screws according to claim 1, characterized in that the screw length is an integral multiple of the pitch greater than 1% - the pitch.
3. Zwillingsschraubensatz nach Anspruch l, dadurch gekennzeichnet, daß nur ein Ende der Schraube eine innere Auswuchthöhle (4) aufweist.3. Twin screw set according to claim l, characterized in that only one end of the screw has an inner balancing cavity (4).
4. Zwillingsschraubensatz nach Anspruch 1, dadurch gekennzeichnet, daß die Schraube keine innere Auswuchthöhle (4) aufweist.4. Set of twin screws according to claim 1, characterized in that the screw has no inner balancing cavity (4).
5. Zwillingsschraubensatz nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß beide Schraubenenden eine Auswuchthöhle (4) aufweisen.5. Twin screw set according to claim 1 or 2, characterized in that both screw ends have a balancing cavity (4).
6. Zwillingsschraubensatz nach Anspruch 3 oder 5, dadurch gekennzeichnet, daß die Umschlingungswinkel der Auswuchthöhlen zur optimalen Abstimmung variiert werden. 6. set of twin screws according to claim 3 or 5, characterized in that the wrap angle of the balancing cavities are varied for optimal coordination.
EP96920676A 1995-12-11 1996-07-08 Double worm system Expired - Lifetime EP0865575B9 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
CH348795 1995-12-11
CH348795 1995-12-11
CH362795 1995-12-21
CH3627/95 1995-12-21
CH3487/95 1995-12-21
CH362795 1995-12-21
PCT/CH1996/000250 WO1997021925A1 (en) 1995-12-11 1996-07-08 Double worm system

Publications (4)

Publication Number Publication Date
EP0865575A1 true EP0865575A1 (en) 1998-09-23
EP0865575B1 EP0865575B1 (en) 2002-12-04
EP0865575B2 EP0865575B2 (en) 2006-11-29
EP0865575B9 EP0865575B9 (en) 2007-06-06

Family

ID=25693140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96920676A Expired - Lifetime EP0865575B9 (en) 1995-12-11 1996-07-08 Double worm system

Country Status (15)

Country Link
US (1) US6139297A (en)
EP (1) EP0865575B9 (en)
JP (1) JP3330955B2 (en)
KR (1) KR100384925B1 (en)
CN (1) CN1083536C (en)
AT (1) ATE229127T1 (en)
CA (1) CA2240168C (en)
CZ (1) CZ289289B6 (en)
DE (1) DE59609957D1 (en)
DK (1) DK0865575T4 (en)
ES (1) ES2186785T3 (en)
NO (1) NO982674L (en)
PT (1) PT865575E (en)
SK (1) SK78098A3 (en)
WO (1) WO1997021925A1 (en)

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Publication number Priority date Publication date Assignee Title
EP1026399A1 (en) 1999-02-08 2000-08-09 Ateliers Busch S.A. Twin feed screw
JP4282867B2 (en) * 2000-03-15 2009-06-24 ナブテスコ株式会社 Screw rotor and screw machine
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CA2240168A1 (en) 1997-06-19
CZ177298A3 (en) 2000-03-15
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US6139297A (en) 2000-10-31
CN1207794A (en) 1999-02-10
ATE229127T1 (en) 2002-12-15
AU6186196A (en) 1997-07-03
NO982674D0 (en) 1998-06-10
CZ289289B6 (en) 2001-12-12
JP2000501809A (en) 2000-02-15
DK0865575T4 (en) 2007-04-02
NO982674L (en) 1998-08-07
CN1083536C (en) 2002-04-24
DE59609957D1 (en) 2003-01-16
WO1997021925A1 (en) 1997-06-19
EP0865575B9 (en) 2007-06-06
KR19990072036A (en) 1999-09-27
ES2186785T3 (en) 2003-05-16
EP0865575B2 (en) 2006-11-29
KR100384925B1 (en) 2003-08-21
DK0865575T3 (en) 2003-03-24
AU719268B2 (en) 2000-05-04
CA2240168C (en) 2007-11-27
EP0865575B1 (en) 2002-12-04
SK78098A3 (en) 1999-02-11
JP3330955B2 (en) 2002-10-07

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