EP0158064B1 - Sealing for a positive-displacement machine for compressible fluids - Google Patents

Sealing for a positive-displacement machine for compressible fluids Download PDF

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Publication number
EP0158064B1
EP0158064B1 EP85101947A EP85101947A EP0158064B1 EP 0158064 B1 EP0158064 B1 EP 0158064B1 EP 85101947 A EP85101947 A EP 85101947A EP 85101947 A EP85101947 A EP 85101947A EP 0158064 B1 EP0158064 B1 EP 0158064B1
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EP
European Patent Office
Prior art keywords
sealing
sealing strip
face
axial
displacement machine
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
Application number
EP85101947A
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German (de)
French (fr)
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EP0158064A3 (en
EP0158064A2 (en
Inventor
Klaus Dieter Dr. Emmenthal
Otto Schäfer
Claus Müller
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.)
Volkswagen AG
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Volkswagen AG
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Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP0158064A2 publication Critical patent/EP0158064A2/en
Publication of EP0158064A3 publication Critical patent/EP0158064A3/en
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Publication of EP0158064B1 publication Critical patent/EP0158064B1/en
Expired legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01CROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C19/00Sealing arrangements in rotary-piston machines or engines
    • F01C19/08Axially-movable sealings for working fluids

Definitions

  • the invention relates to a sealing strip for sealing the axial gaps formed between the fixed housing and the rotating rotor of a positive displacement machine for compressible media according to the preamble of patent claim 1.
  • Known displacement machines for compressible media have at least one displacement chamber, which is arranged in a fixed housing and is designed in the manner of a spiral-shaped slot, and each has a displacement body which is associated with and engages in each displacement chamber and engages in it and which is held on a disk-shaped rotor which can be driven eccentrically with respect to the housing .
  • spiral sealing strips are provided, each of which is held at the front edge of one component and pressed against a sealing surface arranged on the front side of the other component.
  • these sealing strips are held axially resiliently in longitudinal grooves on the end faces of the spiral components.
  • the spring action is formed by an elastomeric, cord-shaped element arranged in the base of the longitudinal groove.
  • Such round cords have a tendency to settle after some time, so that the elastic spring effect is no longer present.
  • the installation of metallic springs in wave form or the like is provided instead of such elastomeric round cords.
  • the sealing strip is resiliently loaded as uniformly as possible over its entire length and that the characteristics of these springs are set such that they are only elastic in a first area, but then go from a certain spring travel to block to exclude the possibility of tarnishing of one component on the other.
  • the object underlying the invention is therefore to provide a seal for a positive displacement machine for compressible media, which avoids the disadvantages of the known designs as far as possible and which does not require the use of special spring elements.
  • 1 denotes a spiral displacement body of a displacement machine designed as a spiral compressor, which on its axial end face has a longitudinal groove 4 for receiving a sealing strip 3, which is pressed resiliently against the sealing surface 5 of a fixed housing, for example at the base of a displacement chamber becomes.
  • Cross-sectional design have that they can deform elastically within certain limits under axial load, which is applied here for the purpose of pressing the sealing strip 3 against the sealing surface 5 during installation.
  • the resilience of the sealing strip 3 is achieved through a targeted shaping.
  • the sealing strip 3 has on its end face facing away from the sealing surface 5 and dipping into the groove 4 a plurality of bending sections 6 lying one behind the other in the longitudinal direction, which have the shape of scale-like lamellae, which are produced by axial and over the groove during a peeling process wide continuous incisions 7 have arisen.
  • These slats 6 deflect transversely under axial load and thus also result in a spring action, the characteristics of which are determined by the width and cross section of the slats 6 and by the depth and width of the incisions 7.
  • the end face of these slats 6 can be rounded.
  • the sealing strip 3 can preferably consist of a filled plastic with good dry-running properties, for example of a mixture of Teflon and bronze. Regardless of the sealing strip material used, the plastic expansion limit must not be exceeded, so that the deformation remains in the elastic range.
  • the spring deflection given by the elastic deformation must be so large that even taking into account the manufacturing tolerances given in the manufacture of the rotor 1 and the housing 2, which change the width of the axial gap "s" between the rotor 1 and the housing 2, always a sufficient pressure of the sealing strip 3 on the sealing surface 5 is maintained. On the other hand, the spring travel of the sealing strip must not be so great that the gap width "s" becomes 0.
  • sealing strips according to the invention gives them their own elasticity, by means of which additional resilient components which place the sealing strip under axial tension can be dispensed with. In addition, the assembly of the sealing strips is considerably simplified.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)

Description

Die Erfindung bezieht sich auf eine Dichtleiste zur Abdichtung der zwischen dem feststehenden Gehäuse und dem umlaufenden Läufer einer Verdrängermaschine für kompressible Medien gebildeten axialen Spalte gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a sealing strip for sealing the axial gaps formed between the fixed housing and the rotating rotor of a positive displacement machine for compressible media according to the preamble of patent claim 1.

Bekannte Verdrängermaschinen für kompressible Medien weisen wenigstens eine in einem feststehenden Gehäuse angeordnete, nach Art eines spiralförmig verlaufenden Schlitzes ausgebildete Verdrängerkammer sowie jeweils einen jeder Verdrängerkammer zugeordneten und in diese eingreifenden ebenfalls spiralförmig ausgebildeten Verdrängerkörper auf, der auf einem gegenüber dem Gehäuse exzentrisch antreibbaren scheibenförmigen Läufer gehalten ist. Zur Abdichtung der zwischen dem feststehenden Gehäuse und dem umlaufenden Läufer gebildeten axialen Spalte sind spiralförmige Dichtleisten vorgesehen, die jeweils am stirnseitigen Rand des einen Bauteils gehalten und gegen eine an der Stirnseite des anderen Bauteils angeordnete Dichtfläche gepreßt sind. Wie beispielsweise aus der US-PS-4 192 152 bekannt ist, sind diese Dichtleisten dabei axial federnd in Längsnuten an den Stirnseiten der spiralförmigen Bauteile gehalten. Zur Überbrückung der bei der Herstellung der einzelnen Bauteile auftretenden Bearbeitungstoleranzen muß ein genügend großer Federweg vorgesehen werden, damit über die gesamte Betriebszeit eine gleichmäßig wirkende axiale Spaltabdichtung gewährleistet ist.Known displacement machines for compressible media have at least one displacement chamber, which is arranged in a fixed housing and is designed in the manner of a spiral-shaped slot, and each has a displacement body which is associated with and engages in each displacement chamber and engages in it and which is held on a disk-shaped rotor which can be driven eccentrically with respect to the housing . To seal the axial gaps formed between the fixed housing and the rotating rotor, spiral sealing strips are provided, each of which is held at the front edge of one component and pressed against a sealing surface arranged on the front side of the other component. As is known, for example, from US Pat. No. 4,192,152, these sealing strips are held axially resiliently in longitudinal grooves on the end faces of the spiral components. To bridge the machining tolerances that occur during the manufacture of the individual components, a sufficiently large spring travel must be provided so that an evenly acting axial gap seal is guaranteed over the entire operating time.

Bei der bekannten Dichtung wird die Federwirkung durch ein im Grund der Längsnut angeordnetes elastomeres, schnurförmiges Element gebildet. Derartige Rundschnüre haben jedoch die Tendenz, sich nach einiger Zeit zu setzen, so daß dann die elastische Federwirkung nicht mehr gegeben ist. Bei anderen bekannten Ausführungen wird anstelle solcher elastomerer Rundschnüre der Einbau von metallischen Federn in Wellenform oder dgl. vorgesehen. Hierbei muß jedoch sichergestellt werden, daß die Dichtleiste über ihre gesamte Länge möglichst gleichmäßig federnd belastet wird und daß die Charakteristik dieser Federn so eingestellt ist, daß sie nur in einem ersten Bereich elastisch sind, dann aber von einem bestimmten Federweg ab auf Block gehen, um ein Anlaufen des einen Bauteils an dem anderen mit Sicherheit auszuschließen.In the known seal, the spring action is formed by an elastomeric, cord-shaped element arranged in the base of the longitudinal groove. Such round cords, however, have a tendency to settle after some time, so that the elastic spring effect is no longer present. In other known designs, the installation of metallic springs in wave form or the like is provided instead of such elastomeric round cords. Here, however, it must be ensured that the sealing strip is resiliently loaded as uniformly as possible over its entire length and that the characteristics of these springs are set such that they are only elastic in a first area, but then go from a certain spring travel to block to exclude the possibility of tarnishing of one component on the other.

Der Einbau derartiger besonderer Federelemente, seien es nun elastomere Rundschnüre oder Metallfedem, ist insgesamt jedoch relativ aufwendig und erfordert große Aufmerksamkeit bei der Montage.However, the installation of such special spring elements, be it elastomeric round cords or metal springs, is relatively complex overall and requires great attention during assembly.

Die der Erfindung zugrundeliegende Aufgabe besteht daher darin, eine Dichtung für eine Verdrängermaschine für kompressible Medien zu schaffen, die die Nachteile der bekannten Ausführungen nach Möglichkeit vermeidet und die ohne die Verwendung besonderer Federelemente auskommt.The object underlying the invention is therefore to provide a seal for a positive displacement machine for compressible media, which avoids the disadvantages of the known designs as far as possible and which does not require the use of special spring elements.

Diese Aufgabe wird gelöst durch das kennzeichnende Merkmal des Patentanspruchs 1. Dichtleisten mit solchen schuppenartigen Lamellen, die durch bei einem Schälvorgang erzeugte axiale und über die Dichtleistenbreite durchgehende Einschnitte entstanden sind, haben gegenüber den bekannten Dichtleisten mit axialer Elastizität den Vorteil, daß ihre Federcharakteristik relativ einfach und wirkungsvoll durch entsprechende Wahl der Breite und des Querschnitts der Lamellen sowie durch die Tiefe und Breite der Einschnitte variiert und den jeweils gewünschten Verhältnissen optimal angepaßt werden kann. Gegenüber den Dichtleistenausbildungen, bei denen im Grund der Dichtleistennut separate Federmittel in Form von bandförmigen Wellfedern vorgesehen sind, ergibt sich der Vorteil, daß die von den schuppenförmigen Lamellen im eingebauten Zustand ausgeübte Flächenpressung gleichmäßig über den gesamten Umfang der Dichtleiste verteilt wird und nicht - wie bei Wellfedern - auf die Bereiche beschränkt bleibt, wo die "Berge" der Wellungen die Dichtleiste berühren.This object is achieved by the characterizing feature of claim 1. Sealing strips with such scale-like lamellae, which have been created by incisions made in a peeling process and through the width of the sealing strips, have the advantage over the known sealing strips with axial elasticity that their spring characteristics are relatively simple and can be varied effectively by appropriate choice of the width and cross section of the slats as well as by the depth and width of the incisions and can be optimally adapted to the desired conditions. Compared to the sealing strip designs, in which separate spring means in the form of band-shaped corrugated springs are provided in the base of the sealing strip groove, there is the advantage that the surface pressure exerted by the scale-shaped lamellae in the installed state is distributed uniformly over the entire circumference of the sealing strip and not - as in the case of Wave springs - limited to the areas where the "mountains" of the corrugations touch the sealing strip.

Eine zweckmäßige Ausgestaltung der Erfindung ergibt sich aus dem Merkmal des Unteranspruchs.An expedient embodiment of the invention results from the feature of the subclaim.

In der Zeichnung ist eine beispielhafte Ausführung einer erfindungsgemäßen Dichtleiste dargestellt, die für den Einsatz bei einer Verdrängermaschine für kompressible Medien geeignet ist. Es zeigt

  • Figur 1: einen Querschnitt und
  • Figur 2: eine Seitenansicht des erfindungsgemäßen Ausführungsbeispiels.
In the drawing, an exemplary embodiment of a sealing strip according to the invention is shown, which is suitable for use in a displacement machine for compressible media. It shows
  • Figure 1: a cross section and
  • Figure 2 is a side view of the embodiment of the invention.

Dabei sind in den Figuren 1 und 2 der Zeichnung jeweils gleiche oder vergleichbare Bauteile mit gleichen Bezugszeichen angegeben.The same or comparable components with the same reference numerals are given in Figures 1 and 2 of the drawing.

So ist mit 1 jeweils ein spiralförmiger Verdrängerkörper einer als Spiralkompressor ausgebildeten Verdrängermaschine bezeichnet, der an seiner axialen Stirnseite eine in Längsrichtung verlaufende Nut 4 zur Aufnahme einer Dichtleiste 3 aufweist, die federnd gegen die Dichtfläche 5 eines feststehenden Gehäuses, beispielsweise am Grund einer Verdrängerkammer, gepreßt wird. Die Dichtleiste 3, die bei der Ausführung nach den Figuren 1 und 2 im wesentlichen einen rechteckförmigen Grundquerschnitt aufweist, soll nun erfindungsgemäß eine solche Form- bzw.Thus, 1 denotes a spiral displacement body of a displacement machine designed as a spiral compressor, which on its axial end face has a longitudinal groove 4 for receiving a sealing strip 3, which is pressed resiliently against the sealing surface 5 of a fixed housing, for example at the base of a displacement chamber becomes. The sealing strip 3, which in the embodiment according to FIGS. 1 and 2 essentially has a rectangular basic cross section, is now intended according to the invention to have such a shape or

Querschnittsgestaltung aufweisen, daß sie sich bei axialer Belastung, die hier zum Zwecke der Anpressung der Dichtleiste 3 an die Dichtfläche 5 beim Einbau aufgebracht wird, innerhalb bestimmter Grenzen elastisch verformen kann.Cross-sectional design have that they can deform elastically within certain limits under axial load, which is applied here for the purpose of pressing the sealing strip 3 against the sealing surface 5 during installation.

Die Federeigenschaft der Dichtleiste 3 wird dabei durch eine gezielte Formgebung erreicht.The resilience of the sealing strip 3 is achieved through a targeted shaping.

Zu diesem Zweck weist die Dichtleiste 3 an ihrer der Dichtfläche 5 abgewandten und in die Nut 4 eintauchenden Stirnseite eine Vielzahl von in Längsrichtung hintereinanderliegenden Biegeabschnitten 6 auf, die die Form von schuppenförmigen Lamellen besitzen, die durch bei einem Schälvorgang erzeugte axiale und über die Nutbreite durchgehende Einschnitte 7 entstanden sind. Diese Lamellen 6 weichen bei axialer Belastung quer aus und ergeben so ebenfalls eine Federwirkung, deren Charakteristik durch Breite und Querschnitt der Lamellen 6 sowie durch die Tiefe und Breite der Einschnitte 7 bestimmt wird. Die Stirnseite dieser Lamellen 6 kann übrigens, wie Figur 1 zeigt, abgerundet sein.For this purpose, the sealing strip 3 has on its end face facing away from the sealing surface 5 and dipping into the groove 4 a plurality of bending sections 6 lying one behind the other in the longitudinal direction, which have the shape of scale-like lamellae, which are produced by axial and over the groove during a peeling process wide continuous incisions 7 have arisen. These slats 6 deflect transversely under axial load and thus also result in a spring action, the characteristics of which are determined by the width and cross section of the slats 6 and by the depth and width of the incisions 7. Incidentally, as shown in FIG. 1, the end face of these slats 6 can be rounded.

Vorzugsweise kann die Dichtleiste 3 aus einem gefüllten Kunststoff mit guten Trockenlaufeigenschaften, beispielsweise aus einer Mischung aus Teflon und Bronze, bestehen. Unabhängig von dem jeweils verwendeten Dichtleistenmaterial darf dessen plastische Dehnungsgrenze nicht überschritten werden, so daß die Verformung im elastischen Bereich bleibt. Der durch die elastische Verformung gegebene Federweg muß so groß sein, daß auch unter Berücksichtigung der bei der Herstellung des Läufers 1 und des Gehäuses 2 gegebenen Fertigungstoleranzen, die die Breite des axialen Spaltes "s" zwischen dem Läufer 1 und dem Gehäuse 2 verändern, immer eine ausreichende Anpressung der Dichtleiste 3 an die Dichtfläche 5 eingehalten wird. Der Federweg der Dichtleiste darf dagegen nicht so groß werden, daß die Spaltbreite "s" zu 0 wird.The sealing strip 3 can preferably consist of a filled plastic with good dry-running properties, for example of a mixture of Teflon and bronze. Regardless of the sealing strip material used, the plastic expansion limit must not be exceeded, so that the deformation remains in the elastic range. The spring deflection given by the elastic deformation must be so large that even taking into account the manufacturing tolerances given in the manufacture of the rotor 1 and the housing 2, which change the width of the axial gap "s" between the rotor 1 and the housing 2, always a sufficient pressure of the sealing strip 3 on the sealing surface 5 is maintained. On the other hand, the spring travel of the sealing strip must not be so great that the gap width "s" becomes 0.

Die erfindungsgemäße Gestaltung der Dichtleisten verleiht diesen eine Eigenelastizität, durch die zusätzliche federnde Bauteile, die die Dichtleiste unter axiale Spannung setzen, entbehrlich gemacht werden. Außerdem wird die Montage der Dichtleisten wesentlich vereinfacht.The design of the sealing strips according to the invention gives them their own elasticity, by means of which additional resilient components which place the sealing strip under axial tension can be dispensed with. In addition, the assembly of the sealing strips is considerably simplified.

Claims (2)

1. A sealing strip (3) for sealing axial gaps which are formed between the components - stationary housing (2), rotating rotor (1) - of a displacement machine for compressible media, wherein the sealing strip (3) is held in an axial groove (4) in one of the components and is axially resiliently pressed against a sealing face disposed on the end face of the other component and is of a design which allows elastic deformation when subjected to an axial pressure load determined by its installation, characterised in that a plurality of lamellar-like flexible portions (6) are provided in series in the longitudinal direction of the sealing strip (3) on the end face of the sealing strip (3) remote from the sealing face (5), which portions are formed by axial recesses (7) in the sealing strip (3), which extend over the breadth of the groove.
2. A sealing strip as claimed in claim 1, characterised in that the end face of the lamellar-like flexible portions (6) is rounded.
EP85101947A 1984-03-23 1985-02-22 Sealing for a positive-displacement machine for compressible fluids Expired EP0158064B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3410735 1984-03-23
DE3410735 1984-03-23

Publications (3)

Publication Number Publication Date
EP0158064A2 EP0158064A2 (en) 1985-10-16
EP0158064A3 EP0158064A3 (en) 1987-05-06
EP0158064B1 true EP0158064B1 (en) 1989-12-27

Family

ID=6231425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101947A Expired EP0158064B1 (en) 1984-03-23 1985-02-22 Sealing for a positive-displacement machine for compressible fluids

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EP (1) EP0158064B1 (en)
DE (1) DE3575007D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102844525A (en) * 2010-01-15 2012-12-26 约马-综合技术有限公司 Vane pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60243301A (en) * 1984-05-18 1985-12-03 Mitsubishi Electric Corp Scroll fluid machine
DE4339527C1 (en) * 1993-11-19 1995-02-16 Freudenberg Carl Fa Sealing arrangement
JP2001132672A (en) * 1999-11-04 2001-05-18 Honda Motor Co Ltd Vane type fluid machine
CN103089649B (en) * 2012-10-30 2016-05-18 徐建涛 Roots-type both vapor compression machine rotor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1105299A (en) * 1954-05-25 1955-11-29 Seringues Ind Soc D Expl Des Advanced seal for sliding elements
CH385404A (en) * 1962-08-30 1964-12-15 Linder Rene Volumetric machine
DE2107203B1 (en) * 1971-02-16 1972-04-27 Praedifa Jaeger Kg SEALING RING MADE OF ELASTIC MATERIAL
DE2133476A1 (en) * 1971-07-06 1973-01-25 Merkel Asbest & Gummiwerke SEAL RING
US4192152A (en) * 1978-04-14 1980-03-11 Arthur D. Little, Inc. Scroll-type fluid displacement apparatus with peripheral drive
DE3012732C2 (en) * 1980-03-25 1986-05-07 Sulzer-Escher Wyss AG, Zürich Hydrostatic support element for supporting a supported part on a supporting part

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102844525A (en) * 2010-01-15 2012-12-26 约马-综合技术有限公司 Vane pump

Also Published As

Publication number Publication date
DE3575007D1 (en) 1990-02-01
EP0158064A3 (en) 1987-05-06
EP0158064A2 (en) 1985-10-16

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