EP0995879B1 - Zwillings-Förderschraubenrotoren - Google Patents
Zwillings-Förderschraubenrotoren Download PDFInfo
- Publication number
- EP0995879B1 EP0995879B1 EP98811063A EP98811063A EP0995879B1 EP 0995879 B1 EP0995879 B1 EP 0995879B1 EP 98811063 A EP98811063 A EP 98811063A EP 98811063 A EP98811063 A EP 98811063A EP 0995879 B1 EP0995879 B1 EP 0995879B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circle
- pitch
- screw
- section
- rotors
- 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
Links
Images
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 positive displacement machines for compressible media, especially pumps, which Rotors catchy executed with varying pitch and intended are, in paraxial, opposite external engagement with wrap angles of at least 720 ° and in an enclosure an axial chamber sequence to form without blast hole connections, wherein the end profile of a Kern Vietnamesebogen, a cycloid-shaped hollow flank, an outer circle arc and another flank (see WO 97/21926).
- the patent DE 87685 shows a fferenganganlwerk designated machine in which the screw rotors with variable pitch are formed.
- the machine is both a motor and a pump usable.
- the patent application EP 0697523 relates to a screw displacement machine, in which the intermeshing rotors unequal, as "male” and “female” designated screw profiles, so-called S.R.M. profiles with continuous slope change.
- the forehead profile is varied so that the tooth head angle or the length of the outer circle arc a monotonically growing function in dependence from the wrap angle.
- Such profiles have the disadvantage that a good foreclosure of the axial sequence of working cells because of the remaining Blasloches is not possible.
- the vacuum losses caused by the blow hole have efficiency losses result, so with such a Machine at least at low and medium speeds no good inner Compaction is possible.
- the published patent application DE 19530662 discloses a screw suction pump with externally meshing screw elements, at the slope the screw members continuously from their inlet end to their outlet end decreases to cause the compression of the gas to be dispensed.
- the shape of the teeth of the screw rotor exhibits an epitrochoidal and / or Archimedean curve.
- This machine has the disadvantage that the achievable internal compression rate in the geometric relationships shown moderate.
- the missing forehead profile variation fixes that anyway not good compression ratio and leads because of the reduction in depth the gap between the screw outer diameter and the housing for Screw end towards an increased leak rate.
- the laid-open specification DE 4445958 describes a screw compressor with counter-rotating, external-meshing screw elements.
- the thread helices of the screw elements are from an axial End to the second axial end away from it continuously smaller.
- Profile is proposed a rectangular or trapezoidal profile.
- a disadvantage of such Profile geometries is that they only work lossless enough, when the flight depth in relation to the diameter is small, as stated in the above Publication is executed. Such a machine thus has a big one Construction volume and a big weight. It is another disadvantage of such Profile geometries that require extremely high pitch changes are when a satisfactory internal compression rate is to be achieved. How in the mentioned DE 19530662 also fixed here the missing Stirnprofilvariation this shortcoming and this leads to an increased leakage rate due to reduction the depth of the gap between screw outside diameter and housing towards the end of the screw.
- the invention is the Task to propose twin screw rotors, which the above have not mentioned disadvantages.
- the slope is not monotonous and as a dependent variable of the wrap angle is defined that the slope in a first portion of the suction end of the screw increases and after about one wrap reaches a maximum value that the slope in one to the first subarea subsequent second portion decreases and about one wrap reaches a minimum value before the pressure end of the screw and that the Gradient in a subsequent to the second portion third portion is substantially constant.
- FIG. 1 shows an exemplary embodiment of a pair of screw rotors 1 and 2 which stand together in an axially parallel external engagement.
- FIGS. 2 and 3 show each of the rotors 1 and 2 according to FIG. 1 separately. It can be clearly seen in these figures that the outer shell and the core are cylindrical and thus the flight depth is constant over the screw length.
- the mass ⁇ 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, whereby leakage losses between rotor and housing inner wall against the pressure side, as at Some of the above-mentioned machines according to the prior art occur in an undesirable manner, be avoided.
- the reference numeral 7 designates the reference spiral in this figure, which will be discussed in more detail later, and 8 is the second limiting spiral of the outer cylindrical rotor surface.
- FIG. 4 shows a rotor in a section at right angles to the rotor axis.
- the resulting end profile has a Kem Vietnamesebogen 3 with a constant over the entire screw length radius Rb, which - in a clockwise direction - after a sector angle ⁇ in a cycloid-shaped hollow flank 4 passes.
- the geometry of the hollow flank 4 is unchanged over the entire screw length.
- At the hollow flank 4 closes at point B at an acute angle an outer circle arc 5 with a constant over the entire screw length radius Ra, which passes to a sector angle ⁇ at point C in a further edge 6.
- 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 at least spatially approximately equidistant course of a reference spiral formed by the outermost points of the hollow flank B ⁇ (7 in FIG. 3) and the second limiting 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 pitch are shown.
- the course of the slope is more clearly recognizable when the first derivative shown in Figure 6 the settlement w considered.
- w 'increases and, at ⁇ 2 ⁇ , reaches the maximum value (1 + A) * L 0 / 2 ⁇ , where A is the amplitude moderator.
- FIG. 7 shows the chamber cross-section F as a function of the wrap angle ⁇ , wherein the curve F o shown by a solid line shows the chamber cross-section without profile variation and the dashed curve F m shows the chamber cross-section with profile variation.
- Figure 8a the cross section is shown of the invention for receiving twin screw rotors certain housing
- Figure 8b shows one of the representation of Figure 4 corresponding section through the rotors
- in figure 8c the chamber cross-section F o is shown hatched.
- FIGS. 9a to 9p the development of the working chamber cross section is shown in end sections represented as a function of the wrap angle. The latter is indicated in the figures in degrees.
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)
- Compressor (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Treatment Of Fiber Materials (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Rotary Pumps (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Cleaning In General (AREA)
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 |
AT98811063T ATE266800T1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-förderschraubenrotoren |
ES98811063T ES2221141T3 (es) | 1998-10-23 | 1998-10-23 | Rotores de tornillos transportadores gemelos. |
DE59811390T DE59811390D1 (de) | 1998-10-23 | 1998-10-23 | Zwillings-Förderschraubenrotoren |
PCT/CH1999/000466 WO2000025004A1 (de) | 1998-10-23 | 1999-10-01 | Zwillingsschraubenrotoren zum einbau in verdrängermaschinen für kompressible medien |
CA002347781A CA2347781C (en) | 1998-10-23 | 1999-10-01 | Twin helical rotors for installation in displacement machines for compressible media |
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 |
CZ20010514A CZ296509B6 (cs) | 1998-10-23 | 1999-10-01 | Dvojice sroubových rotoru pro vestavbu do výtlacných stroju na stlacitelná média |
US09/807,737 US6447276B1 (en) | 1998-10-23 | 1999-10-01 | Twin screw rotors for installation in displacement machines for compressible media |
EEP200100230A EE200100230A (et) | 1998-10-23 | 1999-10-01 | Kaksikkruvirootorid kasutamiseks kompressormasinates |
KR1020017005036A KR100607156B1 (ko) | 1998-10-23 | 1999-10-01 | 압축성 매체용 이송 기계에 설치하기 위한 2중 스크류 로터 |
PL347374A PL202371B1 (pl) | 1998-10-23 | 1999-10-01 | Bliźniacze wirniki śrubowe do wbudowania w maszynach wyporowych dla ośrodków ściśliwych |
SK218-2001A SK2182001A3 (en) | 1998-10-23 | 1999-10-01 | Twin helical rotors for installation in displacement machines for compressible media |
TR2001/01123T TR200101123T2 (tr) | 1998-10-23 | 1999-10-01 | İtici makinalara sıkıştırılabilen maddeler için takılan ikiz uskurlu rotorlar. |
BR9914716-5A BR9914716A (pt) | 1998-10-23 | 1999-10-01 | Rotores de parafusos geminados para a colocação em máquinas de deslocamento para meios compressìveis |
AU58464/99A AU5846499A (en) | 1998-10-23 | 1999-10-01 | Twin helical 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 |
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 EP0995879A1 (de) | 2000-04-26 |
EP0995879B1 true 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 (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102937094A (zh) * | 2012-10-22 | 2013-02-20 | 台州职业技术学院 | 一种干式螺杆真空泵变螺距螺杆 |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6685645B1 (en) * | 2001-10-20 | 2004-02-03 | Zonare Medical Systems, Inc. | Broad-beam imaging |
CH694339A9 (de) * | 2000-07-25 | 2005-03-15 | Busch Sa Atel | Zwillingsschraubenrotoren und solche enthaltende Ve rdraengermaschinen. |
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 |
DE10300203A1 (de) * | 2003-01-08 | 2004-07-22 | Pfeiffer Vacuum Gmbh | Zweiwellenvakuumpumpe sowie Verfahren zur Herstellung einer Zweiwellenvakuumpumpe |
US7753040B2 (en) * | 2003-10-24 | 2010-07-13 | Michael Victor | Helical field accelerator |
EP1875076B1 (de) * | 2005-02-16 | 2008-11-05 | Ateliers Busch S.A. | Volumetrische rotationsmaschine mit asymmetrische profile aufweisenden rotoren |
KR101145127B1 (ko) * | 2005-10-28 | 2012-05-14 | 한라공조주식회사 | 공기 팽창기 설계방법 |
GB0525378D0 (en) | 2005-12-13 | 2006-01-18 | Boc Group Plc | Screw Pump |
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 |
EP2060789A4 (de) * | 2006-09-05 | 2013-08-28 | Toyota Jidoshokki Kk | Schneckenpumpe und schneckenrotor |
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 |
WO2015109048A1 (en) * | 2014-01-15 | 2015-07-23 | Eaton Corporation | Method of optimizing supercharger performance |
CN108350881B (zh) | 2015-10-30 | 2020-12-04 | 加德纳丹佛公司 | 复合螺杆转子 |
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 |
CN111773990B (zh) * | 2020-05-22 | 2024-09-17 | 上海恒奕环境科技有限公司 | 工业污水处理无动力自调节混合加药一体化装置 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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DE87685C (de) | ||||
DE609405C (de) | 1933-01-04 | 1935-02-14 | Aeg | Luftkaeltemaschine |
DE594691C (de) * | 1933-01-04 | 1934-03-21 | Aeg | Schraubenverdichter, bestehend aus rechts- und linksgaengigen, miteinander in Eingriff stehenden, durch Zahnraeder gekuppelten Schrauben |
SE85331C1 (de) | 1935-03-11 | 1936-01-21 | ||
DE697523C (de) | 1935-12-03 | 1940-10-16 | Interessengemeinschaft Fuer Ru | Selbsttaetige Abstimmvorrichtung fuer UEberlagerungsempfaenger |
CH244903A (it) * | 1944-03-29 | 1946-10-15 | Lavorazione Mat Plast | Pressa a viti per il mescolamento e l'estrusione di materiali plastici sintetici. |
US3807911A (en) * | 1971-08-02 | 1974-04-30 | Davey Compressor Co | Multiple lead screw compressor |
SE7310169L (de) | 1973-07-20 | 1975-01-21 | Atlas Copco Ab | |
CH635403A5 (de) | 1978-09-20 | 1983-03-31 | Edouard Klaey | Schraubenspindelmaschine. |
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 |
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 |
KR0133154B1 (ko) | 1994-08-22 | 1998-04-20 | 이종대 | 무단 압축형 스크류식 진공펌프 |
DE4445958A1 (de) | 1994-12-22 | 1996-06-27 | Gerhard Kuerzdoerfer | Schraubenverdichter |
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 |
DE59604068D1 (de) * | 1995-12-11 | 2000-02-03 | Busch Sa Atel | Zwillings-förderschrauben |
-
1998
- 1998-10-23 ES ES98811063T patent/ES2221141T3/es not_active Expired - Lifetime
- 1998-10-23 EP EP98811063A patent/EP0995879B1/de not_active Expired - Lifetime
- 1998-10-23 AT AT98811063T patent/ATE266800T1/de not_active IP Right Cessation
- 1998-10-23 DE DE59811390T patent/DE59811390D1/de not_active Expired - Fee Related
-
1999
- 1999-10-01 SK SK218-2001A patent/SK2182001A3/sk unknown
- 1999-10-01 CA CA002347781A patent/CA2347781C/en not_active Expired - Fee Related
- 1999-10-01 EE EEP200100230A patent/EE200100230A/xx unknown
- 1999-10-01 WO PCT/CH1999/000466 patent/WO2000025004A1/de active IP Right Grant
- 1999-10-01 TR TR2001/01123T patent/TR200101123T2/xx unknown
- 1999-10-01 US US09/807,737 patent/US6447276B1/en not_active Expired - Fee Related
- 1999-10-01 CN CN99812527A patent/CN1113151C/zh not_active Expired - Fee Related
- 1999-10-01 CZ CZ20010514A patent/CZ296509B6/cs not_active IP Right Cessation
- 1999-10-01 KR KR1020017005036A patent/KR100607156B1/ko not_active IP Right Cessation
- 1999-10-01 BR BR9914716-5A patent/BR9914716A/pt not_active IP Right Cessation
- 1999-10-01 AU AU58464/99A patent/AU5846499A/en not_active Abandoned
- 1999-10-01 JP JP2000578545A patent/JP3955731B2/ja not_active Expired - Fee Related
- 1999-10-01 PL PL347374A patent/PL202371B1/pl 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
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102937094A (zh) * | 2012-10-22 | 2013-02-20 | 台州职业技术学院 | 一种干式螺杆真空泵变螺距螺杆 |
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 |
Also Published As
Publication number | Publication date |
---|---|
CA2347781C (en) | 2008-10-14 |
CN1324429A (zh) | 2001-11-28 |
JP2002528668A (ja) | 2002-09-03 |
CZ296509B6 (cs) | 2006-03-15 |
PE20001430A1 (es) | 2000-12-15 |
US6447276B1 (en) | 2002-09-10 |
KR100607156B1 (ko) | 2006-08-01 |
SK2182001A3 (en) | 2001-11-06 |
PL347374A1 (en) | 2002-04-08 |
BR9914716A (pt) | 2001-08-07 |
ATE266800T1 (de) | 2004-05-15 |
JP3955731B2 (ja) | 2007-08-08 |
CA2347781A1 (en) | 2000-05-04 |
WO2000025004A1 (de) | 2000-05-04 |
KR20010080888A (ko) | 2001-08-25 |
TR200101123T2 (tr) | 2001-08-21 |
AR020939A1 (es) | 2002-06-05 |
BG64490B1 (bg) | 2005-04-30 |
AU5846499A (en) | 2000-05-15 |
DE59811390D1 (de) | 2004-06-17 |
CZ2001514A3 (cs) | 2001-12-12 |
PA8484601A1 (es) | 2001-12-14 |
PL202371B1 (pl) | 2009-06-30 |
EE200100230A (et) | 2002-06-17 |
EP0995879A1 (de) | 2000-04-26 |
ES2221141T3 (es) | 2004-12-16 |
BG105371A (en) | 2001-10-31 |
CN1113151C (zh) | 2003-07-02 |
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