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EP 1 674 730 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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11.04.2012 Bulletin 2012/15 |
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Date of filing: 22.12.2005 |
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International Patent Classification (IPC):
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Double-wrap scroll fluid machine
Spiralmaschine mit Doppelspirale
Machine à double spirale
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Designated Contracting States: |
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BE |
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Priority: |
27.12.2004 JP 2004377650
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Date of publication of application: |
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28.06.2006 Bulletin 2006/26 |
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Proprietor: ANEST IWATA CORPORATION |
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Yokohama-shi,
Kanagawa-ken (JP) |
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Inventors: |
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- Sato, Kazuaki
Yokohama-shi, Kanagawa (JP)
- Sato, Toru
Yokohama-shi, Kanagawa (JP)
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Representative: Donné, Eddy |
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Bureau M.F.J. Bockstael nv
Arenbergstraat 13 2000 Antwerpen 2000 Antwerpen (BE) |
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References cited: :
DE-A1- 3 814 931 JP-A- 2004 116 471 US-A1- 2004 086 407
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JP-A- 2002 349 456 JP-A- 2004 308 481
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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BACKGROUND OF THE INVENTION
[0001] The present invention relates to a scroll fluid machine such as a scroll compressor,
a scroll vacuum pump, a scroll expander or a scroll blower and especially relates
to a double-wrap scroll fluid machine in which an orbiting wrap of an orbiting scroll
is allowed to engage with a stationary wrap of a stationary scroll to form a spiral
sealed chamber between the two wraps, two fluid-pressure variable units being thus
formed in a casing.
[0002] Such a double-wrap scroll fluid machine is known from
DE 3 814 931 A1, considered to represent the closest prior art.
JP 2002-349456A discloses a scroll fluid machine in which an orbiting scroll is driven with the outer
circumference, but in three self-rotation preventing devices, a crankshaft integrally
formed with a driving shaft driven with a belt is not exactly synchronized with another
crankshaft which is not driven.
[0003] There is difference in pressure between corresponding parts of spiral sealed chambers
of the fluid-pressure variable units to make revolution of an end plate of an orbiting
scroll tilted with respect to a surface perpendicular to an axis of a crankshaft or
to cause waving.
[0004] JP 2004-116471A discloses a scroll fluid machine in which similar disadvantage to the above is involved
in orbiting scrolls at both ends of an orbiting shaft which is not driven. An electric
motor is disposed as driving source between right and left fluid-pressure variable
units to increase its size as a whole. And if malfunction is caused in the fluid-pressure
variable unit, it has to be detached with the electric motor for replacement, which
is troublesome. Difference in axial load which applies to the orbiting scroll of the
two fluid-pressure variable units increases loads acting onto the bearing and orbiting
scroll end plate.
SUMMARY OF THE INVENTION
[0005] In view of the disadvantages, it is an object of the present invention to provide
a double-wrap scroll fluid machine in which right and left fluid-pressure variable
units are synchronously driven via a belt to reduce a space between the right and
left fluid-pressure variable units as small as possible thereby reducing a whole size
and weight, an endless belt being easily removed from a driving shaft without disassembling
or detaching the fluid-pressure variable unit.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] The features and advantages of the invention will become more apparent from the following
description with respect to embodiments as shown in appended drawings wherein:
Fig. 1 is a vertical sectional front view showing one embodiment of the present invention
in which separate driving shafts are connected to each other with a tubular coupling;
Fig. 2 is a vertical sectional front view showing that the tubular coupling is moved
from the connecting portion of the driving shafts; and
Fig. 3 is a vertical sectional front view of another embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0007] In Figs. 1 and 2, bearing tubes 3,3 projects from the opposite inner surfaces of
side walls 2,2 of a housing 1. The outer ends of two coaxial separate driving shafts
5,5 fit in ball bearings 4,4 in the bearing tubes 3,3. An eccentric axial portion
6 is provided at the outer end of each of the separate driving shafts 5,5. The eccentric
axial portion 6 is rotatably put in a boss 9 of an orbiting scroll end plate 8 via
a roller bearing 7.
[0008] A plurality of cooling fins 10 are provided on the inner surface of the orbiting
scroll end plate 8 and an orbiting wrap 11 is provided on the outer surface. The orbiting
wrap 11 engages with a stationary wrap 13 which projects on a stationary scroll end
plate 12 the circumference of which is fixed to the housing 1. A fluid-pressure variable
unit 14 is formed on each side of the housing 1.
[0009] At three points equally spaced on the circumference of the inner surface of each
of the orbiting scroll end plate 8, a receiving tube 15 is formed. In the figure,
only one of them is shown. The end of a support shaft is fixed in the receiving tube
15.
[0010] A support tube 17 is provided between the side walls 2 and 2 of the housing 1 along
a line between the two receiving tubes 15 and 15. In an eccentric tube 20 which is
put in a thick portion 18 in the support tube 17, the support shaft 16 is rotatably
supported via a bearing 21. Eccentricity of the eccentric tube 20 is equal to that
of the eccentric axial portion 6 of the driving shaft 5.
[0011] The support shaft 16 plays a role of a crankshaft which can eccentrically revolve
in the support shaft 17. An outward flange 22 which projects radially is formed at
the opposing end faces. The outward flanges 22,22 are spaced from each other to enable
an endless driving belt 23 to pass between them obliquely.
[0012] A tubular coupling 24 freely fits on the driving shaft 5 around one of the flanges
22. An annular web 27 is provided on the inner surface of a driven pulley 26 having
an outer circumferential surface 25 on which the belt 23 is wound in the tubular coupling
24. The annular web 27 fits on the driving shaft 5 to allow it to contact the outer
side surface of the outward flange 22.
[0013] A counter weight 28 is provided in the tubular coupling 24. The outward flanges 22,
22 facing each other with a space are connected to the annular web 27 with a screw
29.
[0014] An endless belt 23 is driven by external power to allow the orbiting scroll of the
fluid-pressure variable unit 14 to revolve eccentrically, so that fluid absorbed through
the outer side of the fluid-pressure variable unit 14 is pressurized towards a center.
[0015] By detaching the tightening screw 29, the tubular coupling 24 is axially moved and
an opening between the facing outward flanges 22 and 22 is exposed to put the endless
belt 23 into or take it out of the opening for replacement.
[0016] The driven pulley 26 may be separate from the tubular coupling 24 and may be disposed
on one of the driving shafts 5.
[0017] As shown in Fig. 3, axial splines 30,31 may be provided on the inner circumference
of a driven pulley 26 of a tubular coupling 24 and the outer circumference of outward
flanges 22 of separate driving shafts 5,5 respectively. The spline 30 meshes with
the spline 31 to assure firm coupling of drivinf shafts 5 and 5.
[0018] The foregoing merely relates to embodiments of the invention. Various modifications
and changes may be made by a person skilled in the art without the scope of claims
wherein:
1. A double-wrap scroll fluid machine comprising:
a first driving shaft having a first eccentric axial portion at an outer end;
a first orbiting scroll having a first orbiting wrap, said first orbiting scroll being
rotatably mounted around the first eccentric axial portion of the first driving shaft;
a first stationary scroll having a first stationary wrap and being coaxial with the
driving shaft, said first stationary wrap engaging with said first orbiting wrap to
form a first spiral sealed chamber between the first stationary wrap and the first
orbiting wrap;
a plurality of first self-rotation preventing devices mounted to the first orbiting
scroll to prevent self-rotation of the first orbiting scroll;
a second driving shaft having a second eccentric axial portion at an outer end and
being disposed to be coaxial with the first driving shaft;
a second orbiting scroll having a second orbiting wrap, said second orbiting scroll
being rotatably mounted around the second eccentric axial portion of the second driving
shaft;
a second stationary scroll having a second stationary wrap and being coaxial with
the driving shaft, said second stationary wrap engaging with said second orbiting
wrap to form a second spiral sealed chamber between the second stationary wrap and
the second orbiting wrap;
a plurality of second self-rotation preventing devices mounted to the orbiting scroll
to prevent self-rotation of the orbiting scroll; and
characterised in that a driving endless belt is located at the inner ends of the first and second driving
shafts so that the two driving shafts can rotate together.
2. A double-wrap scroll fluid machine as claimed in claim 1 wherein the inner ends of
the first and second driving shafts are connected to each other with a space.
3. A double-wrap scroll fluid machine as claimed in claim 1 wherein the inner ends of
the first and second driving shafts are connected to each other with a tubular coupling.
4. A double-wrap scroll fluid machine as claimed in claim 3 wherein a first outward flange
is formed at the inner end of the first driving shaft, a second outward flange being
formed at the inner end of the second driving shaft, the first and second flanges
being fixed to the tubular coupling with a screw.
5. A double-wrap scroll fluid machine as claimed 3 wherein the tubular coupling plays
a role of a driven pulley on which the endless belt is wound.
6. A double-wrap scroll fluid machine as claimed in claim 3 wherein a first outward flange
is formed at the inner end of the first driving shaft, a second outward flange have
the same diameter as that of the first flange being formed at the inner end of the
second driving shaft, a spline being formed an outer circumferences of the first and
second flanges, another spline being formed on an inner circumference of the tubular
coupling to mesh with the spline of the outer circumferences of the first and second
flanges.
1. Doppelblatt-Scrollfluidmaschine, umfassend:
eine erste Antriebswelle mit einem ersten exzentrischen axialen Teil an einem äußeren
Ende;
eine erste orbitierende Spirale, die ein erstes orbitierendes Blatt aufweist, wobei
besagte erste orbitierende Spirale rotierbar um den ersten exzentrischen axialen Teil
der ersten Antriebswelle montiert ist;
eine erste stationäre Spirale, die ein erstes stationäres Blatt aufweist und koaxial
mit der Antriebswelle ist, wobei besagtes erstes stationäres Blatt mit besagtem ersten
orbitierenden Blatt ineinandergreift, um eine erste spiralförmige abgedichtete Kammer
zwischen dem ersten stationären Blatt und dem ersten orbitierenden Blatt zu bilden;
eine Vielzahl erster, Eigenrotation verhindernder Vorrichtungen, die an der ersten
orbitierenden Spirale montiert sind, um Eigenrotation der ersten orbitierenden Spirale
zu verhindern;
eine zweite Antriebswelle, die einen zweiten exzentrischen axialen Teil an einem äußeren
Ende aufweist und so angeordnet ist, dass sie koaxial mit der ersten Antriebswelle
ist;
eine zweite orbitierende Spirale, die ein zweites orbitierendes Blatt aufweist, wobei
besagte zweite orbitierende Spirale rotierbar um den zweiten exzentrischen axialen
Teil der zweiten Antriebswelle montiert ist;
eine zweite stationäre Spirale, die ein zweites stationäres Blatt aufweist und koaxial
mit der Antriebswelle ist, wobei besagtes zweites stationäres Blatt mit besagtem zweiten
orbitierenden Blatt ineinandergreift, um eine zweite spiralförmige abgedichtete Kammer
zwischen dem zweiten stationären Blatt und dem zweiten orbitierenden Blatt zu bilden;
eine Vielzahl zweiter, Eigenrotation verhindernder Vorrichtungen, die an der orbitierenden
Spirale montiert sind, um Eigenrotation der orbitierenden Spirale zu verhindern; und
dadurch gekennzeichnet, dass ein Endlos-Treibriemen sich an den inneren Enden der ersten und der zweiten Antriebswelle
befindet, sodass die zwei Antriebswellen zusammen rotieren können.
2. Doppelblatt-Scrollfluidmaschine, wie in Anspruch 1 beansprucht, wobei die inneren
Enden der ersten und der zweiten Antriebswelle über einen Raum miteinander verbunden
sind.
3. Doppelblatt-Scrollfluidmaschine, wie in Anspruch 1 beansprucht, wobei die inneren
Enden der ersten und der zweiten Antriebswelle über eine röhrenförmige Kupplung miteinander
verbunden sind.
4. Doppelblatt-Scrollfluidmaschine, wie in Anspruch 3 beansprucht, wobei ein erster Auswärtsflansch
an dem inneren Ende der ersten Antriebswelle gebildet ist, wobei ein zweiter Auswärtsflansch
an dem inneren Ende der zweiten Antriebswelle gebildet ist, wobei der erste und der
zweite Flansch mit einer Schraube an der röhrenförmigen Kupplung befestigt sind.
5. Doppelblatt-Scrollfluidmaschine, wie in Anspruch 3 beansprucht, wobei die röhrenförmige
Kupplung die Rolle einer Abtriebsscheibe spielt, auf der der Endlosriemen aufgewickelt
ist.
6. Doppelblatt-Scrollfluidmaschine, wie in Anspruch 3 beansprucht, wobei ein erster Auswärtsflansch
an dem inneren Ende der ersten Antriebswelle gebildet ist, wobei ein zweiter Auswärtsflansch,
der den gleichen Durchmesser wie der des ersten Flanschs aufweist, an dem inneren
Ende der zweiten Antriebswelle gebildet ist, wobei eine Kerbverzahnung an Außenumfängen
des ersten und des zweiten Flanschs gebildet ist, wobei eine weitere Kerbverzahnung
an einem Innenumfang der röhrenförmigen Kupplung gebildet ist, um mit der Kerbverzahnung
der Außenumfänge des ersten und des zweiten Flanschs ineinanderzugreifen.
1. Machine pour fluides à volutes du type à double enroulement, comprenant :
un premier arbre d'entraînement possédant une première portion axiale excentrique
à une extrémité externe ;
une première volute orbitante possédant un premier enroulement orbitant, ladite première
volute orbitante étant montée en rotation autour de la première portion axiale excentrique
du premier arbre d'entraînement ;
une première volute stationnaire possédant un premier enroulement stationnaire et
étant disposée en position coaxiale avec l'arbre d'entraînement, ledit premier enroulement
stationnaire venant s'engrener avec ledit premier enroulement orbitant pour former
une première chambre étanchée en spirale entre le premier enroulement stationnaire
et le premier enroulement orbitant ;
plusieurs premiers dispositifs empêchant l'autorotation montés sur la première volute
orbitante pour empêcher l'autorotation de la première volute orbitante ;
un deuxième arbre d'entraînement possédant une deuxième portion axiale excentrique
à une extrémité externe et étant disposé en position coaxiale avec le premier arbre
d'entraînement ;
une deuxième volute orbitante possédant un deuxième enroulement orbitant, ladite deuxième
volute orbitante étant montée en rotation autour de la deuxième portion axiale excentrique
du deuxième arbre d'entraînement ;
une deuxième volute stationnaire possédant un deuxième enroulement stationnaire et
étant disposée en position coaxiale avec l'arbre d'entraînement, ledit deuxième enroulement
stationnaire venant s'engrener avec ledit deuxième enroulement orbitant pour former
une deuxième chambre étanchée en spirale entre le deuxième enroulement stationnaire
et le deuxième enroulement orbitant ;
plusieurs deuxièmes dispositifs empêchant l'autorotation montés sur la volute orbitante
pour empêcher l'autorotation de la volute orbitante ; et
caractérisé en ce qu'une courroie d'entraînement sans fin est disposée aux extrémités internes du premier
et du deuxième arbre d'entraînement, si bien que les deux arbres d'entraînement peuvent
être mis en rotation de manière conjointe.
2. Machine pour fluides à volutes du type à double enroulement selon la revendication
1, dans laquelle les extrémités internes du premier et du deuxième arbre d'entraînement
sont reliées l'une à l'autre avec un espace.
3. Machine pour fluides à volutes du type à double enroulement selon la revendication
1, dans laquelle les extrémités internes du premier et du deuxième arbre d'entraînement
sont reliées l'une à l'autre avec un raccord tubulaire.
4. Machine pour fluides à volutes du type à double enroulement selon la revendication
3, dans laquelle une première bride externe est formée à l'extrémité interne du premier
arbre d'entraînement, une deuxième bride externe étant formée à l'extrémité interne
du deuxième arbre d'entraînement, la première et la deuxième bride étant fixées au
raccord tubulaire à l'aide d'une vis.
5. Machine pour fluides à volutes du type à double enroulement selon la revendication
3, dans laquelle le raccord tubulaire joue le rôle d'une poulie menée sur laquelle
vient s'enrouler la courroie sans fin.
6. Machine pour fluides à volutes du type à double enroulement selon la revendication
3, dans laquelle une première bride externe est formée à l'extrémité interne du premier
arbre d'entraînement, une deuxième bride externe possédant le même diamètre que celui
de la première bride étant formée à l'extrémité interne du deuxième arbre d'entraînement,
une cannelure étant formée sur les circonférences externes de la première et de la
deuxième bride, une autre cannelure étant formée sur la circonférence interne du raccord
tubulaire pour venir s'engrener avec la cannelure des circonférences externes de la
première et de la deuxième bride.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description