EP0995879A1 - Zwillings-Förderschraubenrotoren - Google Patents
Zwillings-Förderschraubenrotoren Download PDFInfo
- Publication number
- EP0995879A1 EP0995879A1 EP98811063A EP98811063A EP0995879A1 EP 0995879 A1 EP0995879 A1 EP 0995879A1 EP 98811063 A EP98811063 A EP 98811063A EP 98811063 A EP98811063 A EP 98811063A EP 0995879 A1 EP0995879 A1 EP 0995879A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw
- slope
- arc
- rotors
- flank
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines 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
- F01C1/16—Rotary-piston machines or engines 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/082—Details specially related to intermeshing engagement type machines or engines
- F01C1/084—Toothed wheels
Definitions
- the invention relates to twin screw rotors for installation in displacement machines for compressible media, especially pumps, which Rotors with single pitch and varying pitch are designed for this purpose are, in axially parallel, opposing external engagement with wrap angles of at least 720 ° and an axial chamber sequence in one housing without forming blow hole connections, whereby the end profile from a core arc, a cycloid-shaped hollow flank, an outer arc and another edge.
- the patent DE 87685 shows a capsule mechanism as a helical gear designated machine in which the screw rotors with variable pitch are trained.
- the machine is both a motor and a pump usable.
- the rotors are optionally conical.
- Both of the aforementioned machines have the disadvantage that they require tapered cylinders, which makes the rotors in and out only on one side can be expanded. This increases the effort in assembly and Disassembly of the machines, which is particularly important for maintenance and cleaning work is very disadvantageous.
- Patent application EP 0697523 relates to a screw displacement machine, where the intermeshing rotors are unequal, screw profiles referred to as "male” and “female”, so-called S.R.M. profiles with a continuous change in slope.
- the forehead profile is varied such that the tooth tip angle or the length of the outer arc a monotonously growing function depending of the wrap angle.
- Such profiles have the disadvantage that a good isolation of the axial sequence of work cells due to the remaining Blow hole is not possible.
- the vacuum losses caused by the blow hole result in losses in efficiency, so with such Machine not a good inner one, at least at low and medium speeds Compression is possible.
- the published patent application DE 19530662 discloses a screw suction pump with intermeshing screw elements, in which the slope of the screw members continuously from their inlet end to their outlet end decreases to cause compression of the gas to be discharged.
- the shape of the teeth of the screw rotor is epitrochoidal and / or Archimedean curve. This machine has the disadvantage that the achievable internal compression rate with the geometrical relationships shown is moderate. In addition, the missing variation of the forehead profile fixes this anyway not good compression ratio and leads because of the reduction in depth of the gap between the outer screw diameter and the housing Screw end towards an increased leak rate.
- the published patent application DE 4445958 describes a screw compressor with counter-rotating, intermeshing screw elements.
- the thread spirals of the screw elements are axial End continuously smaller toward the second axial end distant therefrom.
- a rectangular or trapezoidal profile is proposed for the profile.
- a disadvantage of such Profile geometries consist in the fact that they only work sufficiently lossless, if the depth of the passage is small in relation to the diameter, as in the above Publication is running. Such a machine thus has a big one Construction volume and a large weight.
- There is another disadvantage of such Profile geometries that require extremely high slope changes are, if a satisfactory internal compression rate is to be achieved. How in the DE 19530662 mentioned, the missing forehead profile variation also fixes here this shortcoming and this leads to an increased leak rate due to reduction the depth of the gap between the outer screw diameter and the housing towards the screw end.
- the invention lies Task based on proposing twin screw rotors that the above Disadvantages mentioned do not have.
- the slope is not monotonous and as a dependent variable on the wrap angle
- the slope in a first partial area from suction-side screw end increases and after about one loop reaches a maximum value that the slope in a to the first sub-area subsequent second sub-area decreases and about one loop reached a minimum value before the pressure-side screw end and that the Incline in a third partial area adjoining the second partial area is essentially constant.
- FIG. 1 shows an embodiment of a pair of screw rotors 1 and 2 which are in axially parallel external engagement with one another.
- FIGS. 2 and 3 show each of the rotors 1 and 2 according to FIG. It can be clearly seen in these figures that the outer jacket and the core are cylindrical and thus the pitch is constant over the screw length.
- the masses ⁇ w 1 and ⁇ w 3 show that the pitch of the screw varies along the axis, but that the height h of the helical outer cylindrical rotor surface remains constant, causing leakage losses between the rotor and the inner wall of the housing towards the pressure side, as in the case of some of the machines mentioned in the prior art occur in an undesirable manner can be avoided.
- reference numeral 7 denotes the reference spiral, which will be discussed in more detail later, and 8 is the second delimiting spiral of the outer, cylindrical rotor surface.
- a rotor is shown in a section perpendicular to the rotor axis.
- the resulting end profile has a core arc 3 with a constant radius Rb over the entire screw length, which - clockwise - merges into a cycloid-shaped hollow flank 4 after a sector angle ⁇ .
- the geometry of the hollow flank 4 is unchanged over the entire screw length.
- the hollow flank 4 is adjoined at point B by an external arc 5 with a radius Ra that is constant over the entire screw length and which, after a sector angle ⁇ at point C, merges into a further flank 6. This ends with a tangential transition into the core arc 3.
- the variation of the front profile contour along the screw axis is based on a change in the sector angle ⁇ and on a change in the geometry of the further flank 6.
- the variation of the sector angle ⁇ along the screw axis is preferably spatially at least approximately equidistant course of a reference spiral (7 in FIG. 3) formed by the outermost points of the hollow flank B ⁇ and the second delimitation spiral (points C) (8 in FIG. 3) of the outer cylindrical rotor surface.
- FIG. 5 shows in a diagram the development w of the reference spiral mentioned in connection with FIG. 4 as a function of the wrap angle ⁇ .
- a straight line g and corresponding sections P 0 , 2P 0 etc. of the development of a spiral with a constant slope are also shown.
- the course of the slope can be seen more clearly if one takes the first derivative shown in FIG development w considered.
- w 'increases and reaches ⁇ 2 ⁇ the maximum value where A is the amplitude moderator.
- FIG. 7 shows the chamber cross section F as a function of the wrap angle ⁇ , the curve F o shown with a solid line showing the chamber cross section without profile variation and the dashed curve F m showing the chamber cross section with profile variation.
- FIG. 8a shows the cross section of a housing intended to accommodate twin screw rotors according to the invention
- FIG. 8b shows a section through the rotors corresponding to the representation of FIG. 4, and the chamber cross section F o is shown hatched in FIG. 8c.
- FIGS. 9a to 9p show the development of the working chamber cross section in end sections shown depending on the wrap angle. The latter is given in degrees in the figures.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compressor (AREA)
- Cleaning In General (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
- Figur 1
- ein Paar miteinander in Eingriff stehende Schraubenrotoren,
- Figur 2
- den rechtsgängigen Rotor,
- Figur 3
- den linksgängigen Rotor,
- Figur 4
- einen Stirnschnitt eines Schraubenrotors mit variierendem Profil,
- Figur 5
- die Abwicklung der Referenzspirale eines erfindungsgemässen Rotors,
- Figur 6
- den Steigungsverlauf der Abwicklung gemäss Figur 4,
- Figur 7
- den Verlauf des Arbeitskammerquerschnitts bei einer Maschine ohne und mit Profilvariation,
- Figur 8a bis 8c
- Gehäuse-, Rotor-, und Arbeitskammerquerschnitt eines mit erfindungsgemässen Rotoren ausgestatteten Verdichters und
- Figur 9a bis 9p
- Stirnschnitte durch ein Rotorenpaar, welche die Entwicklung des Arbeitskammerquerschnitts gemäss Figur 7 veranschaulichen.
Claims (3)
- Zwillingsschraubenrotoren zum Einbau in Verdrängermaschinen für kompressible Medien, welche Rotoren eingängig mit variierender Steigung ausgeführt und dazu bestimmt sind, in achsparallelem, gegenläufigem Ausseneingriff mit Umschlingungswinkeln von mindestens 720° zu stehen und in einem Gehäuse eine axiale Kammersequenz ohne Blaslochverbindungen zu bilden, wobei das Stirnprofil aus einem Kernkreisbogen (3), einer zykloidenförmigen Hohlflanke (4), einem Aussenkreisbogen (5) und einer weiteren Flanke (6) besteht, dadurch gekennzeichnet, dass die Steigung nicht monoton verläuft und als abhängige Variable vom Umschlingungswinkel definiert ist, dass die Steigung in einem ersten Teilbereich (T1) vom saugseitigen Schraubenende her zunimmt und nach ca. einer Umschlingung einen Maximalwert erreicht, dass die Steigung in einem an den ersten Teilbereich anschliessenden zweiten Teilbereich (T2) abnimmt und ca. eine Umschlingung vor dem druckseitigen Schraubenende einen Minimalwert erreicht und dass die Steigung in einem an den zweiten Teilbereich anschliessenden dritten Teilbereich (T3) im wesentlichen konstant ist.
- Zwillingsschraubenrotoren nach Anspruch 1, dadurch gekennzeichnet, dass die Stirnprofilkonturen entlang der Schraubenachse variieren, indem sich die Sektorwinkel (γ) von Kernkreisbogen (3) und Aussenkreisbogen (5) verändern und indem sich die Geometrie der weiteren Flanke (6) verändert, wobei der Kernkreisradius (Rb), der Aussenkreisradius (Ra) und die Geometrie der Hohlflanke konstant sind und wobei die äussersten Punkte der Hohlflanke die Referenz-Spirale (7) zur Definition des Steigungsverlaufs bilden.
- Zwillingsschraubenrotoren nach Anspruch 2, dadurch gekennzeichnet, dass die Variation der Sektorwinkel (γ) von Kernkreisbogen (3) und Aussenkreisbogen (5) entlang der Schraubenachse bestimmt ist durch einen räumlich mindestens annähernd äquidistanten Verlauf der Referenzspirale (7) und der zweiten Begrenzungsspirale (8) der äusseren, zylindrischen Rotorfläche.
Priority Applications (21)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98811063A EP0995879B1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-Förderschraubenrotoren |
DE59811390T DE59811390D1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-Förderschraubenrotoren |
ES98811063T ES2221141T3 (es) | 1998-10-23 | 1998-10-23 | Rotores de tornillos transportadores gemelos. |
AT98811063T ATE266800T1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-förderschraubenrotoren |
KR1020017005036A KR100607156B1 (ko) | 1998-10-23 | 1999-10-01 | 압축성 매체용 이송 기계에 설치하기 위한 2중 스크류 로터 |
AU58464/99A AU5846499A (en) | 1998-10-23 | 1999-10-01 | Twin helical rotors for installation in displacement machines for compressible media |
US09/807,737 US6447276B1 (en) | 1998-10-23 | 1999-10-01 | Twin screw rotors for installation in displacement machines for compressible media |
JP2000578545A JP3955731B2 (ja) | 1998-10-23 | 1999-10-01 | 圧縮可能な媒体用の容積式機械に搭載するツイン・スクリューロータ |
BR9914716-5A BR9914716A (pt) | 1998-10-23 | 1999-10-01 | Rotores de parafusos geminados para a colocação em máquinas de deslocamento para meios compressìveis |
CN99812527A CN1113151C (zh) | 1998-10-23 | 1999-10-01 | 装在可压缩介质挤出机中的双螺旋转子 |
PCT/CH1999/000466 WO2000025004A1 (de) | 1998-10-23 | 1999-10-01 | Zwillingsschraubenrotoren zum einbau in verdrängermaschinen für kompressible medien |
PL347374A PL202371B1 (pl) | 1998-10-23 | 1999-10-01 | Bliźniacze wirniki śrubowe do wbudowania w maszynach wyporowych dla ośrodków ściśliwych |
CZ20010514A CZ296509B6 (cs) | 1998-10-23 | 1999-10-01 | Dvojice sroubových rotoru pro vestavbu do výtlacných stroju na stlacitelná média |
SK218-2001A SK2182001A3 (en) | 1998-10-23 | 1999-10-01 | Twin helical rotors for installation in displacement machines for compressible media |
EEP200100230A EE200100230A (et) | 1998-10-23 | 1999-10-01 | Kaksikkruvirootorid kasutamiseks kompressormasinates |
TR2001/01123T TR200101123T2 (tr) | 1998-10-23 | 1999-10-01 | İtici makinalara sıkıştırılabilen maddeler için takılan ikiz uskurlu rotorlar. |
CA002347781A CA2347781C (en) | 1998-10-23 | 1999-10-01 | Twin helical rotors for installation in displacement machines for compressible media |
PE1999001047A PE20001430A1 (es) | 1998-10-23 | 1999-10-18 | Rotores helicoidales gemelos para ser montados en maquinas compresoras de medios compresibles |
PA19998484601A PA8484601A1 (es) | 1998-10-23 | 1999-10-21 | Rotores helicoidales gemelos para ser montados en maquinas compresoras de medio compresibles |
ARP990105343A AR020939A1 (es) | 1998-10-23 | 1999-10-22 | Rotores helicoidales gemelos para ser montados en máquinas compresoras de medios compresibles. |
BG105371A BG64490B1 (bg) | 1998-10-23 | 2001-03-22 | Сдвоени винтови ротори за вграждане в нагнетателни машини за свиваеми среди |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98811063A EP0995879B1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-Förderschraubenrotoren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0995879A1 true EP0995879A1 (de) | 2000-04-26 |
EP0995879B1 EP0995879B1 (de) | 2004-05-12 |
Family
ID=8236402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98811063A Expired - Lifetime EP0995879B1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-Förderschraubenrotoren |
Country Status (21)
Country | Link |
---|---|
US (1) | US6447276B1 (de) |
EP (1) | EP0995879B1 (de) |
JP (1) | JP3955731B2 (de) |
KR (1) | KR100607156B1 (de) |
CN (1) | CN1113151C (de) |
AR (1) | AR020939A1 (de) |
AT (1) | ATE266800T1 (de) |
AU (1) | AU5846499A (de) |
BG (1) | BG64490B1 (de) |
BR (1) | BR9914716A (de) |
CA (1) | CA2347781C (de) |
CZ (1) | CZ296509B6 (de) |
DE (1) | DE59811390D1 (de) |
EE (1) | EE200100230A (de) |
ES (1) | ES2221141T3 (de) |
PA (1) | PA8484601A1 (de) |
PE (1) | PE20001430A1 (de) |
PL (1) | PL202371B1 (de) |
SK (1) | SK2182001A3 (de) |
TR (1) | TR200101123T2 (de) |
WO (1) | WO2000025004A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002008609A1 (de) * | 2000-07-25 | 2002-01-31 | Ateliers Busch Sa | Zwillingsschraubenrotoren und solche enthaltende verdrängermaschinen |
DE10300203A1 (de) * | 2003-01-08 | 2004-07-22 | Pfeiffer Vacuum Gmbh | Zweiwellenvakuumpumpe sowie Verfahren zur Herstellung einer Zweiwellenvakuumpumpe |
WO2007068973A1 (en) * | 2005-12-13 | 2007-06-21 | Edwards Limited | Screw pump |
Families Citing this family (14)
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US6685645B1 (en) * | 2001-10-20 | 2004-02-03 | Zonare Medical Systems, Inc. | Broad-beam imaging |
DE10102341A1 (de) * | 2001-01-19 | 2002-08-08 | Ralf Steffens | Profilkontur einer Schraubenspindelpumpe |
WO2004001229A1 (ja) * | 2002-06-24 | 2003-12-31 | Hokuetsu Industries Co., Ltd. | スクリュロータ |
US7753040B2 (en) * | 2003-10-24 | 2010-07-13 | Michael Victor | Helical field accelerator |
ES2318456T3 (es) * | 2005-02-16 | 2009-05-01 | Ateliers Busch S.A. | Maquina rotativa volumetrica con rotores de perfiles asimetricos. |
KR101145127B1 (ko) * | 2005-10-28 | 2012-05-14 | 한라공조주식회사 | 공기 팽창기 설계방법 |
JP4853168B2 (ja) * | 2006-08-10 | 2012-01-11 | 株式会社豊田自動織機 | スクリューポンプ |
JP4893630B2 (ja) * | 2006-09-05 | 2012-03-07 | 株式会社豊田自動織機 | スクリュポンプ及びスクリュロータ |
US8328542B2 (en) * | 2008-12-31 | 2012-12-11 | General Electric Company | Positive displacement rotary components having main and gate rotors with axial flow inlets and outlets |
DE102012009103A1 (de) * | 2012-05-08 | 2013-11-14 | Ralf Steffens | Spindelverdichter |
CN102937094B (zh) * | 2012-10-22 | 2016-05-04 | 台州职业技术学院 | 一种干式螺杆真空泵变螺距螺杆 |
WO2015109048A1 (en) * | 2014-01-15 | 2015-07-23 | Eaton Corporation | Method of optimizing supercharger performance |
KR102621304B1 (ko) * | 2015-10-30 | 2024-01-04 | 가드너 덴버, 인크 | 복합 스크류 로터 |
CN105422448B (zh) * | 2016-01-05 | 2017-05-31 | 中国石油大学(华东) | 一种变齿宽变螺距的螺杆转子 |
Citations (13)
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---|---|---|---|---|
DE87685C (de) | ||||
DE594691C (de) * | 1933-01-04 | 1934-03-21 | Aeg | Schraubenverdichter, bestehend aus rechts- und linksgaengigen, miteinander in Eingriff stehenden, durch Zahnraeder gekuppelten Schrauben |
DE609405C (de) | 1933-01-04 | 1935-02-14 | Aeg | Luftkaeltemaschine |
SE85331C1 (de) | 1935-03-11 | 1936-01-21 | ||
DE697523C (de) | 1935-12-03 | 1940-10-16 | Interessengemeinschaft Fuer Ru | Selbsttaetige Abstimmvorrichtung fuer UEberlagerungsempfaenger |
US3807911A (en) * | 1971-08-02 | 1974-04-30 | Davey Compressor Co | Multiple lead screw compressor |
DE2434782A1 (de) | 1973-07-20 | 1975-02-06 | Atlas Copco Ab | Drehkolbenmaschine |
DE2934065A1 (de) | 1978-09-20 | 1980-04-03 | Beyeler Johann | Schrauben-drehkolbenmaschine |
DE2944714A1 (de) | 1979-11-06 | 1981-05-14 | Helmut 1000 Berlin Karl | Rotationskolbenmaschine |
DE3332707A1 (de) | 1983-09-10 | 1985-03-28 | Dietrich Dipl.-Ing. 5206 Neunkirchen-Seelscheid Densch | Brennkraftmaschine |
DE19530662A1 (de) | 1994-08-22 | 1996-02-29 | Kowell Precision Co | Schraubenvakuumpumpe |
DE4445958A1 (de) | 1994-12-22 | 1996-06-27 | Gerhard Kuerzdoerfer | Schraubenverdichter |
WO1997021926A1 (de) * | 1995-12-11 | 1997-06-19 | Ateliers Busch S.A. | Zwillings-förderschrauben |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CH244903A (it) * | 1944-03-29 | 1946-10-15 | Lavorazione Mat Plast | Pressa a viti per il mescolamento e l'estrusione di materiali plastici sintetici. |
JP3593365B2 (ja) | 1994-08-19 | 2004-11-24 | 大亜真空株式会社 | ねじれ角可変型歯車 |
JP2904719B2 (ja) * | 1995-04-05 | 1999-06-14 | 株式会社荏原製作所 | スクリューロータ及びその歯形の軸直角断面形状を決定する方法並びにスクリュー機械 |
-
1998
- 1998-10-23 DE DE59811390T patent/DE59811390D1/de not_active Expired - Fee Related
- 1998-10-23 EP EP98811063A patent/EP0995879B1/de not_active Expired - Lifetime
- 1998-10-23 ES ES98811063T patent/ES2221141T3/es not_active Expired - Lifetime
- 1998-10-23 AT AT98811063T patent/ATE266800T1/de not_active IP Right Cessation
-
1999
- 1999-10-01 SK SK218-2001A patent/SK2182001A3/sk unknown
- 1999-10-01 PL PL347374A patent/PL202371B1/pl not_active IP Right Cessation
- 1999-10-01 AU AU58464/99A patent/AU5846499A/en not_active Abandoned
- 1999-10-01 CA CA002347781A patent/CA2347781C/en not_active Expired - Fee Related
- 1999-10-01 JP JP2000578545A patent/JP3955731B2/ja not_active Expired - Fee Related
- 1999-10-01 CN CN99812527A patent/CN1113151C/zh not_active Expired - Fee Related
- 1999-10-01 WO PCT/CH1999/000466 patent/WO2000025004A1/de active IP Right Grant
- 1999-10-01 KR KR1020017005036A patent/KR100607156B1/ko not_active IP Right Cessation
- 1999-10-01 US US09/807,737 patent/US6447276B1/en not_active Expired - Fee Related
- 1999-10-01 EE EEP200100230A patent/EE200100230A/xx unknown
- 1999-10-01 CZ CZ20010514A patent/CZ296509B6/cs not_active IP Right Cessation
- 1999-10-01 TR TR2001/01123T patent/TR200101123T2/xx unknown
- 1999-10-01 BR BR9914716-5A patent/BR9914716A/pt not_active IP Right Cessation
- 1999-10-18 PE PE1999001047A patent/PE20001430A1/es not_active Application Discontinuation
- 1999-10-21 PA PA19998484601A patent/PA8484601A1/es unknown
- 1999-10-22 AR ARP990105343A patent/AR020939A1/es active IP Right Grant
-
2001
- 2001-03-22 BG BG105371A patent/BG64490B1/bg unknown
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE87685C (de) | ||||
DE594691C (de) * | 1933-01-04 | 1934-03-21 | Aeg | Schraubenverdichter, bestehend aus rechts- und linksgaengigen, miteinander in Eingriff stehenden, durch Zahnraeder gekuppelten Schrauben |
DE609405C (de) | 1933-01-04 | 1935-02-14 | Aeg | Luftkaeltemaschine |
SE85331C1 (de) | 1935-03-11 | 1936-01-21 | ||
DE697523C (de) | 1935-12-03 | 1940-10-16 | Interessengemeinschaft Fuer Ru | Selbsttaetige Abstimmvorrichtung fuer UEberlagerungsempfaenger |
US3807911A (en) * | 1971-08-02 | 1974-04-30 | Davey Compressor Co | Multiple lead screw compressor |
DE2434782A1 (de) | 1973-07-20 | 1975-02-06 | Atlas Copco Ab | Drehkolbenmaschine |
DE2934065A1 (de) | 1978-09-20 | 1980-04-03 | Beyeler Johann | Schrauben-drehkolbenmaschine |
DE2944714A1 (de) | 1979-11-06 | 1981-05-14 | Helmut 1000 Berlin Karl | Rotationskolbenmaschine |
DE3332707A1 (de) | 1983-09-10 | 1985-03-28 | Dietrich Dipl.-Ing. 5206 Neunkirchen-Seelscheid Densch | Brennkraftmaschine |
DE19530662A1 (de) | 1994-08-22 | 1996-02-29 | Kowell Precision Co | Schraubenvakuumpumpe |
DE4445958A1 (de) | 1994-12-22 | 1996-06-27 | Gerhard Kuerzdoerfer | Schraubenverdichter |
WO1997021926A1 (de) * | 1995-12-11 | 1997-06-19 | Ateliers Busch S.A. | Zwillings-förderschrauben |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2002008609A1 (de) * | 2000-07-25 | 2002-01-31 | Ateliers Busch Sa | Zwillingsschraubenrotoren und solche enthaltende verdrängermaschinen |
US6702558B2 (en) | 2000-07-25 | 2004-03-09 | Ateliers Busch Sa | Twin screw rotors and displacement machines containing the same |
CH694339A5 (de) * | 2000-07-25 | 2004-11-30 | Busch Sa Atel | Zwillingsschraubenmotoren und solche enthaltende Verdrängermaschinen. |
AU2001267247B2 (en) * | 2000-07-25 | 2005-07-07 | Ateliers Busch Sa | Twin screw rotors and displacement machines containing the same |
KR100737321B1 (ko) | 2000-07-25 | 2007-07-09 | 아뜰리에 부쉬 에스.에이. | 쌍 스크루 로터 및 그것을 포함하는 배출기 |
JP2008196505A (ja) * | 2000-07-25 | 2008-08-28 | Atelier Busch Sa | ツイン・スクリュー・ロータおよび押し退け機 |
JP4677469B2 (ja) * | 2000-07-25 | 2011-04-27 | アテリエ ビスク ソシエテ アノニム | ツイン・スクリュー・ロータおよび押し退け機 |
CZ305182B6 (cs) * | 2000-07-25 | 2015-06-03 | Ateliers Busch Sa | Šroubové rotory tvořící dvojčata a vytlačovací stroje s těmito rotory |
DE10300203A1 (de) * | 2003-01-08 | 2004-07-22 | Pfeiffer Vacuum Gmbh | Zweiwellenvakuumpumpe sowie Verfahren zur Herstellung einer Zweiwellenvakuumpumpe |
US7192262B2 (en) | 2003-01-08 | 2007-03-20 | Pfeiffer Vacuum Gmbh | Twin-shaft vacuum pump and method of forming same |
WO2007068973A1 (en) * | 2005-12-13 | 2007-06-21 | Edwards Limited | Screw pump |
US8827669B2 (en) | 2005-12-13 | 2014-09-09 | Edwards Limited | Screw pump having varying pitches |
Also Published As
Publication number | Publication date |
---|---|
BR9914716A (pt) | 2001-08-07 |
CA2347781C (en) | 2008-10-14 |
CZ296509B6 (cs) | 2006-03-15 |
SK2182001A3 (en) | 2001-11-06 |
EP0995879B1 (de) | 2004-05-12 |
EE200100230A (et) | 2002-06-17 |
ATE266800T1 (de) | 2004-05-15 |
AU5846499A (en) | 2000-05-15 |
JP3955731B2 (ja) | 2007-08-08 |
PA8484601A1 (es) | 2001-12-14 |
PL347374A1 (en) | 2002-04-08 |
BG105371A (en) | 2001-10-31 |
CA2347781A1 (en) | 2000-05-04 |
ES2221141T3 (es) | 2004-12-16 |
US6447276B1 (en) | 2002-09-10 |
DE59811390D1 (de) | 2004-06-17 |
CN1324429A (zh) | 2001-11-28 |
PL202371B1 (pl) | 2009-06-30 |
AR020939A1 (es) | 2002-06-05 |
JP2002528668A (ja) | 2002-09-03 |
CZ2001514A3 (cs) | 2001-12-12 |
BG64490B1 (bg) | 2005-04-30 |
CN1113151C (zh) | 2003-07-02 |
PE20001430A1 (es) | 2000-12-15 |
KR20010080888A (ko) | 2001-08-25 |
TR200101123T2 (tr) | 2001-08-21 |
WO2000025004A1 (de) | 2000-05-04 |
KR100607156B1 (ko) | 2006-08-01 |
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