EP0959251A1 - Rotary gear compressor and method for its operation - Google Patents

Rotary gear compressor and method for its operation Download PDF

Info

Publication number
EP0959251A1
EP0959251A1 EP99109591A EP99109591A EP0959251A1 EP 0959251 A1 EP0959251 A1 EP 0959251A1 EP 99109591 A EP99109591 A EP 99109591A EP 99109591 A EP99109591 A EP 99109591A EP 0959251 A1 EP0959251 A1 EP 0959251A1
Authority
EP
European Patent Office
Prior art keywords
neutral
pressure
space
chamber
delivery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99109591A
Other languages
German (de)
French (fr)
Other versions
EP0959251B1 (en
Inventor
Heinrich Dipl.-Ing. Amlinger
Herbert Roth
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.)
SGI-PROZESS-TECHNIK GmbH
Original Assignee
SGI-PROZESS-TECHNIK GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SGI-PROZESS-TECHNIK GmbH filed Critical SGI-PROZESS-TECHNIK GmbH
Publication of EP0959251A1 publication Critical patent/EP0959251A1/en
Application granted granted Critical
Publication of EP0959251B1 publication Critical patent/EP0959251B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps

Definitions

  • the invention relates to a rotary tooth compressor with a a gear room, a neutral room and a funding room penetrating first pump shaft and one parallel second pump shaft, which from the gearbox through the neutral space and the funding area leads, the two pump shafts each in the delivery chamber have a rotor and wherein the delivery chamber to carry out the two pump shafts a labyrinth seal sealed off from the neutral room is.
  • the invention further relates to a method for operating such a rotary tooth compressor.
  • Such rotary tooth compressors are called dry running machines for the compression of gas by a pressure difference of 2 bar and are therefore known.
  • Pressures as 3 bar (a) are suitable for rotary tooth compressors not because it will result in undesirable excessive wear the seals are coming.
  • the well-known rotary tooth compressors have on both sides of the funding area a neutral space that is connected to the atmosphere.
  • the invention is based on the problem of a rotary tooth compressor of the type mentioned at the beginning so that it has higher pressure differentials and higher absolute pressures than previously can compress without its seals subject to high wear. Furthermore should a method for operating such a rotary compressor be created.
  • the first-mentioned problem is solved by that the gearbox and the neutral room are pressure-tight executed and each with a pressure medium connection are provided that the two pump shafts between the delivery room and the gear box and those from the Transmission shaft leading out to the pump shaft between the atmosphere and the gearbox a shaft seal are sealed, which one against the respective pump shaft adjacent to the delivery chamber has facing sealing lip.
  • the speed compressor according to the invention enables it in one-step execution up to to 3 bar (a) and in two stages up to 5 up to 6 bar (a) to compress reliably. At the same time is ensured by the pressure-tight neutral space, that no process gas is leaked into the environment of the rotary compressor.
  • the desired, reduced compared to the funding area Pressure in the neutral rooms is inevitable if the two neutral rooms each with the Have suction connection of the rotary tooth compressor.
  • the second problem namely the creation of a Method for operating the rotary tooth compressor according to the invention, is solved according to the invention in that the gearbox-side, neutral room with an under the pressure in the delivery chamber and the gearbox with one under pressure in the production rooms, however pressure above atmospheric pressure becomes.
  • the rotary tooth compressor according to the invention optimal with regard to the life of the shaft seals used.
  • the gradual pressurization at the same time ensured that no gas from the neutral Space can get into the funding room.
  • the rotary tooth compressor shown as a whole in FIG. 1 has in a housing 1 a delivery chamber 2, in which two rotors 3, 4 are arranged. Each of these rotors 3, 4 is arranged on a pump shaft 5, 6. To both The side of the delivery chamber 2 is a pressure-tight, neutral one Room 7, 8 provided, each with a pressure medium connection 9, 10 has. Seen in Figure 1 to the left of the neutral Room 7 is located in the housing 1, a gear room 11, which is also pressure-tight and one Has pressure medium connection 12. Located in gearbox 11 there is a gear 13, which the two pump shafts 5, 6 gears together. The pump shaft 6 leads out of the gear chamber 11 and is with a motor 14 flanged to the outside of the housing 1 connected.
  • the pump shafts 5, 6 penetrate with their respective right end the right, neutral room 8 and are each stored in a pedestal storage room 15, 16, which is hermetically sealed from the outside.
  • the pump shafts 5, 6 are between the delivery chamber 2 and the respective neutral room 8 each with a labyrinth seal 17, 18, 19, 20 sealed.
  • Shaft seals 21, 22 seal the plummer block 15, 16 compared to the neutral Room 8 onwards.
  • Corresponding shaft sealing rings 23, 24 seal the neutral space 7 with respect to the gear space 11 and a shaft seal 25 opposite the gear chamber 11 the atmosphere.
  • a purge gas source 31 enables the gear chamber 11 and defined the two neutral rooms 7, 8 with a purge gas To apply pressure.
  • This purge gas can the neutral spaces 7, 8 via an overflow valve 32 leave. This way you can go into the neutral Evacuate rooms 7, 8 penetrating process gas continuously.
  • FIG. 1 This shows compared to FIG. 1 greatly increases the shaft seals located on the pump shaft 6 22, 24, 25. All three shaft seals 22, 24, 25 have one against the pump shaft 6 Sealing lip 26, 27, 28.
  • the sealing lip 28 of the Shaft sealing ring 22 points away from the delivery chamber 2.
  • Figure 2 also shows that the pillow block 16 has a pressure medium connection 30 and this Pressure medium connection 30 through a line 29 to the Pressure medium connection 10 of the right neutral room 8 connected is. The left one is also connected to this line 29 neutral room 7 connected. It is connected to the Suction side of the machine stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Rotary Pumps (AREA)
  • Supercharger (AREA)

Abstract

The compressor has sealing rings (24, 25) are provided for the two pump shafts (5, 6) to separate the work and gear regions (2, 11), and also for the pump shaft (6) protruding from the gear region (11) to separate this region from the surrounding atmosphere. Each sealing ring has a lip in contact with the shaft and oriented towards the work region (2) of the compressor. Two parallel pump shafts extend through the gear, neutral and work regions, both shafts being provided with a rotor (3, 4) inside the work region. A labyrinth seal (17-20) is provided for the pump shafts in between the work and neutral regions. An Independent claim is also included for a method of operating the above compressor, by providing a pressure in the neutral region which is lower than that in the work region, and providing a pressure in the gear region which is less than that in the work region but greater than atmospheric pressure.

Description

Die Erfindung betrifft einen Drehzahnverdichter mit einer einen Getrieberaum, einen neutralen Raum und einen Förderraum durchdringenden ersten Pumpenwelle und einer hierzu parallelen zweiten Pumpenwelle, welche von dem Getrieberaum durch den neutralen Raum und den Förderraum führt, wobei die beiden Pumpenwellen jeweils in dem Förderraum einen Rotor aufweisen und wobei der Förderraum zur Durchführung der beiden Pumpenwellen jeweils durch eine Labyrinthabdichtung gegenüber dem neutralen Raum abgedichtet ist. Weiterhin betrifft die Erfindung ein Verfahren zum Betrieb eines solchen Drehzahnverdichters.The invention relates to a rotary tooth compressor with a a gear room, a neutral room and a funding room penetrating first pump shaft and one parallel second pump shaft, which from the gearbox through the neutral space and the funding area leads, the two pump shafts each in the delivery chamber have a rotor and wherein the delivery chamber to carry out the two pump shafts a labyrinth seal sealed off from the neutral room is. The invention further relates to a method for operating such a rotary tooth compressor.

Solche Drehzahnverdichter werden als trocken laufende Maschinen für die Verdichtung von Gas um eine Druckdifferenz von 2 bar eingesetzt und sind daher bekannt. Für höhere Drücke als 3 bar (a) eignen sich Drehzahnverdichter nicht, weil es dann zu einem unerwünscht starken Verschleiß der Dichtungen kommt. Die bekannten Drehzahnverdichter haben zu beiden Seiten des Förderraumes jeweils einen neutralen Raum, der Verbindung zur Atmosphäre hat.Such rotary tooth compressors are called dry running machines for the compression of gas by a pressure difference of 2 bar and are therefore known. For higher ones Pressures as 3 bar (a) are suitable for rotary tooth compressors not because it will result in undesirable excessive wear the seals are coming. The well-known rotary tooth compressors have on both sides of the funding area a neutral space that is connected to the atmosphere.

Für die Gasverdichtung, insbesondere von Sauerstoff, auf absolute Drücke von 5 bis 6 bar wurden bis jetzt ölfreie Kolbenverdichter verwendet, die sehr aufwendig aufgebaut und deshalb teuer sind. Weiterhin erfordern sie einen hohen Serviceaufwand, da etwa alle 6.000 bis 8.000 Betriebsstunden die Kolbenringe und Ventile ausgewechselt werden müssen. For gas compression, especially of oxygen absolute pressures of 5 to 6 bar have so far been oil-free Piston compressor used, which is very complex and are therefore expensive. Furthermore, they require a high one Service requirements, as every 6,000 to 8,000 operating hours the piston rings and valves replaced Need to become.

Der Erfindung liegt das Problem zugrunde, einen Drehzahnverdichter der eingangs genannten Art so umzugestalten, dass er auf höhere Druckdifferenzen und höhere Absolutdrücke als bisher verdichten kann, ohne dass seine Dichtungen einem hohen Verschleiß unterliegen. Weiterhin soll ein Verfahren zum Betrieb eines solchen Drehzahnverdichters geschaffen werden.The invention is based on the problem of a rotary tooth compressor of the type mentioned at the beginning so that it has higher pressure differentials and higher absolute pressures than previously can compress without its seals subject to high wear. Furthermore should a method for operating such a rotary compressor be created.

Das erstgenannte Problem wird erfindungsgemäß dadurch gelöst, dass der Getrieberaum und der neutrale Raum druckdicht ausgeführt und jeweils mit einem Druckmittelanschluss versehen sind, dass die beiden Pumpenwellen zwischen dem Förderraum und dem Getrieberaum und die aus dem Getrieberaum nach außen herausführende Pumpenwelle zwischen der Atmosphäre und dem Getrieberaum jeweils durch einen Wellendichtring abgedichtet sind, welcher eine gegen die jeweilige Pumpenwelle anliegende, zum Förderraum hin gerichtete Dichtlippe aufweist.According to the invention, the first-mentioned problem is solved by that the gearbox and the neutral room are pressure-tight executed and each with a pressure medium connection are provided that the two pump shafts between the delivery room and the gear box and those from the Transmission shaft leading out to the pump shaft between the atmosphere and the gearbox a shaft seal are sealed, which one against the respective pump shaft adjacent to the delivery chamber has facing sealing lip.

Bei einem solchen Drehzahlverdichter kann man den neutralen Raum und den Getrieberaum so abgestuft druckbeaufschlagen, dass die Wellendichtringe jeweils nur einem Teil der Druckdifferenz zwischen dem Druck im Förderraum und dem Atmosphärendruck ausgesetzt sind. Man kann zum Beispiel bei einem absoluten Druck im Förderraum von 5 bar, so dass ein mittlerer Druck in den Labyrinthabdichtungen von 4 bar ansteht, im neutralen Raum einen absoluten Druck von 3 bar und im Getrieberaum einen absoluten Druck von 2 bar einstellen. Die Wellendichtringe zwischen dem neutralen Raum und dem Getrieberaum und der Wellendichtring zwischen dem Getrieberaum und der Atmosphäre werden dann jeweils nur mit einer Druckdifferenz von 1 bar beansprucht, was zu einer langen Lebensdauer dieser Dichtungen führt. Der erfindungsgemäße Drehzahlverdichter ermöglicht es in einstufiger Ausführung bis auf 3 bar (a) und in zweistufiger Ausführung bis auf 5 bis 6 bar (a) betriebssicher zu komprimieren. Zugleich wird durch den druckdichten neutralen Raum sichergestellt, dass kein Prozessgas als Leckgas in die Umgebung des Drehzahnverdichters gelangen kann.With such a speed compressor you can use the neutral one Pressurize the space and the gearbox area so graduated that that the shaft seals only one Part of the pressure difference between the pressure in the delivery chamber and are exposed to atmospheric pressure. You can go to Example with an absolute pressure in the delivery chamber of 5 bar so that a medium pressure in the labyrinth seals of 4 bar, an absolute one in neutral space Pressure of 3 bar and an absolute one in the gearbox Set pressure of 2 bar. The shaft seals between the neutral space and the gearbox and the Shaft seal between the gearbox and the atmosphere are then only with a pressure difference stressed by 1 bar, resulting in a long service life of these seals leads. The speed compressor according to the invention enables it in one-step execution up to to 3 bar (a) and in two stages up to 5 up to 6 bar (a) to compress reliably. At the same time is ensured by the pressure-tight neutral space, that no process gas is leaked into the environment of the rotary compressor.

Bei einem Drehzahnverdichter, bei dem die beiden Pumpenwellen an der dem Getrieberaum gegenüberliegenden Seite des Förderraumes jeweils in einem Stehlagerraum gelagert sind, wobei zwischen dem Stehlagerraum und dem Förderraum ebenfalls ein neutraler Raum vorgesehen ist, kann man ebenfalls eine lange Lebensdauer des dort anzuordnenden Wellendichtringes erreichen, wenn gemäß einer Weiterbildung der Erfindung der Stehlagerraum und der zwischen ihm und dem Förderraum liegende neutrale Raum druckdicht ausgeführt und jeweils mit einem Druckmittelanschluss versehen sind und wenn jeder Stehlagerraum durch einen gegen die Pumpenwelle mit einer Dichtlippe anliegenden Wellendichtring abgedichtet ist.With a rotary tooth compressor in which the two pump shafts on the side opposite the gearbox of the delivery room each stored in a pedestal storage room are, between the pillow block and the delivery room a neutral room is also provided, one can also a long life of the to be arranged there Achieve shaft sealing ring if according to a training the invention of the pillow block and the space between it and the neutral space located in the delivery chamber is pressure-tight and each with a pressure medium connection and if each pillow block is countered by one the pump shaft with a shaft sealing ring in contact with a sealing lip is sealed.

Der gewünschte, gegenüber dem Förderraum verringerte Druck in den neutralen Räumen stellt sich zwangsläufig ein, wenn die beiden neutralen Räume jeweils mit der Saugseite des Drehzahnverdichters Verbindung haben.The desired, reduced compared to the funding area Pressure in the neutral rooms is inevitable if the two neutral rooms each with the Have suction connection of the rotary tooth compressor.

Das zweitgenannte Problem, nämlich die Schaffung eines Verfahrens zum Betrieb des erfindungsgemäßen Drehzahnverdichters, wird gemäß der Erfindung dadurch gelöst, dass der getrieberaumseitige, neutrale Raum mit einem unter dem Druck im Förderraum liegenden Druck und der Getrieberaum mit einem unter dem Druck in den Förderräumen jedoch über dem Atmosphärendruck liegenden Druck beaufschlagt wird.The second problem, namely the creation of a Method for operating the rotary tooth compressor according to the invention, is solved according to the invention in that the gearbox-side, neutral room with an under the pressure in the delivery chamber and the gearbox with one under pressure in the production rooms, however pressure above atmospheric pressure becomes.

Hierdurch wird der erfindungsgemäße Drehzahnverdichter bezüglich der Lebensdauer der Wellendichtringe optimal eingesetzt. Durch die abgestufte Druckbeaufschlagung wird zugleich sichergestellt, dass kein Gas aus dem neutralen Raum in den Förderraum gelangen kann.As a result, the rotary tooth compressor according to the invention optimal with regard to the life of the shaft seals used. The gradual pressurization at the same time ensured that no gas from the neutral Space can get into the funding room.

Ein Eindringen von Fett von den Stehlagern in den Förderraum lässt sich auf einfache Weise dadurch vermeiden, dass auch der stehlagerraumseitige, neutrale Raum mit einem unter dem Druck im Förderraum liegenden Druck beaufschlagt wird.Penetration of grease from the plummer block bearings into the pumping chamber can be easily avoided by that the neutral storage-room-side, neutral room with one pressurized under the pressure in the delivery chamber becomes.

Günstig ist es auch, wenn der Stehlagerraum und der ihn vom Förderraum trennende neutrale Raum an eine gemeinsame Druckmittelquelle angeschlossen sind. Hierdurch wird eine Belastung des Wellendichtringes des Stehlagers durch eine Druckdifferenz gänzlich ausgeschlossen. Auch beim Anfahren und Stillsetzen des Drehzahnverdichters können durch diese Druckmittelverbindung keine Druckdifferenzen auf den Wellendichtring des Stehlagers wirken.It is also favorable if the pedestal storage room and him neutral space separating from the funding area to a common one Pressure medium source are connected. This will create a Loading of the shaft sealing ring of the pillow block bearing by Pressure difference completely excluded. Even when starting off and the rotary compressor can be stopped this pressure medium connection has no pressure differences the shaft sealing ring of the pillow block.

Aus dem Förderraum in die neutralen Räume einsickerndes Prozessgas kann aus den neutralen Räumen kontinuierlich entfernt werden, wenn gemäß einer anderen Weiterbildung der Erfindung die neutralen Räume zur Druckbeaufschlagung mit einer Spülgasquelle verbunden sind und jeweils einen durch ein Überströmventil geregelten Spülgasauslass aufweisen. Ein solcher kontinuierlicher Spülgasstrom führt zugleich zu einer Temperaturabsenkung an den Wellendichtringen und dadurch zu einer Erhöhung ihrer Standzeit. Außerdem werden Getriebeölansammlungen im neutralen Raum bei Undichtigkeit am Wellendichtring vermieden.Something that seeps into the neutral rooms from the production area Process gas can flow continuously from the neutral rooms be removed if according to another training the invention, the neutral pressurized spaces are connected to a purge gas source and one each have a purge gas outlet regulated by an overflow valve. Such a continuous purge gas flow leads at the same time to a temperature reduction on the shaft sealing rings and thereby an increase in their service life. Furthermore become gear oil accumulations in neutral space avoided in the event of a leak on the shaft sealing ring.

Die Erfindung lässt verschiedene Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips sind zwei davon in der Zeichnung dargestellt und werden nachfolgend beschrieben. Diese zeigt in

Fig.1
einen Längsschnitt durch einen Drehzahnverdichter nach der Erfindung,
Fig.2
eine Prinzipskizze, welche im Schnitt die Anordnung und Gestaltung der Wellendichtringe des Drehzahnverdichters und ihre Druckmittelversorgung sowie eine gegenüber Figur 1 geänderte Gasbeaufschlagung zeigt.
The invention permits various embodiments. To further clarify its basic principle, two of them are shown in the drawing and are described below. This shows in
Fig. 1
2 shows a longitudinal section through a rotary tooth compressor according to the invention,
Fig. 2
a schematic diagram, which shows in section the arrangement and design of the shaft sealing rings of the rotary compressor and their pressure medium supply as well as a changed gas supply compared to Figure 1.

Der in Figur 1 als Ganzes dargestellte Drehzahnverdichter hat in einem Gehäuse 1 einen Förderraum 2, in welchem zwei Rotoren 3, 4 angeordnet sind. Jeder dieser Rotoren 3, 4 ist auf einer Pumpenwelle 5, 6 angeordnet. Zu beiden Seiten des Förderraumes 2 ist ein druckdichter, neutraler Raum 7, 8 vorgesehen, der jeweils einen Druckmittelanschluss 9, 10 hat. In Figur 1 gesehen links von dem neutralen Raum 7 befindet sich im Gehäuse 1 ein Getrieberaum 11, der ebenfalls druckdicht ausgeführt ist und einen Druckmittelanschluss 12 aufweist. Im Getrieberaum 11 befindet sich ein Getriebe 13, welches die beiden Pumpenwellen 5, 6 getrieblich miteinander verbindet. Die Pumpenwelle 6 führt aus dem Getrieberaum 11 heraus und ist mit einem außen an dem Gehäuse 1 angeflanschten Motor 14 verbunden.The rotary tooth compressor shown as a whole in FIG. 1 has in a housing 1 a delivery chamber 2, in which two rotors 3, 4 are arranged. Each of these rotors 3, 4 is arranged on a pump shaft 5, 6. To both The side of the delivery chamber 2 is a pressure-tight, neutral one Room 7, 8 provided, each with a pressure medium connection 9, 10 has. Seen in Figure 1 to the left of the neutral Room 7 is located in the housing 1, a gear room 11, which is also pressure-tight and one Has pressure medium connection 12. Located in gearbox 11 there is a gear 13, which the two pump shafts 5, 6 gears together. The pump shaft 6 leads out of the gear chamber 11 and is with a motor 14 flanged to the outside of the housing 1 connected.

Die Pumpenwellen 5, 6 durchdringen mit ihrem jeweils rechten Ende den rechten, neutralen Raum 8 und sind jeweils in einem Stehlagerraum 15, 16 gelagert, welcher nach außen hin hermetisch verschlossen ist. Die Pumpenwellen 5, 6 sind zwischen dem Förderraum 2 und dem jeweiligen neutralen Raum 8 jeweils durch eine Labyrinthabdichtung 17, 18, 19, 20 abgedichtet. Wellendichtringe 21, 22 dichten die Stehlagerräume 15, 16 gegenüber dem neutralen Raum 8 ab. Entsprechende Wellendichtringe 23, 24 dichten den neutralen Raum 7 gegenüber dem Getrieberaum 11 und ein Wellendichtring 25 den Getrieberaum 11 gegenüber der Atmosphäre ab. The pump shafts 5, 6 penetrate with their respective right end the right, neutral room 8 and are each stored in a pedestal storage room 15, 16, which is hermetically sealed from the outside. The pump shafts 5, 6 are between the delivery chamber 2 and the respective neutral room 8 each with a labyrinth seal 17, 18, 19, 20 sealed. Shaft seals 21, 22 seal the plummer block 15, 16 compared to the neutral Room 8 onwards. Corresponding shaft sealing rings 23, 24 seal the neutral space 7 with respect to the gear space 11 and a shaft seal 25 opposite the gear chamber 11 the atmosphere.

Eine Spülgasquelle 31 ermöglicht es, den Getrieberaum 11 und die beiden neutralen Räume 7, 8 mit einem Spülgas definierten Druck zu beaufschlagen. Dieses Spülgas vermag über ein Überströmventil 32 die neutralen Räume 7, 8 zu verlassen. Auf diese Weise kann man in die neutralen Räume 7, 8 eindringendes Prozessgas kontinuierlich abführen.A purge gas source 31 enables the gear chamber 11 and defined the two neutral rooms 7, 8 with a purge gas To apply pressure. This purge gas can the neutral spaces 7, 8 via an overflow valve 32 leave. This way you can go into the neutral Evacuate rooms 7, 8 penetrating process gas continuously.

Zur weiteren Erläuterung der Erfindung wird nunmehr auf die Figur 2 Bezug genommen. Diese zeigt gegenüber Figur 1 stark vergrößert die auf der Pumpenwelle 6 sitzenden Wellendichtringe 22, 24, 25. Alle drei Wellendichtringe 22, 24, 25 haben eine gegen die Pumpenwelle 6 anliegende Dichtlippe 26, 27, 28. Die Dichtlippen 26, 27 der Wellendichtringe 24, 25, welche den Getrieberaum 11 zur Atmosphäre und zu dem neutralen Raum 7 hin abdichten, weisen in Richtung des Förderraumes 2. Die Dichtlippe 28 des Wellendichtringes 22 weist vom Förderraum 2 weg.To further explain the invention, reference is now made to the figure 2 referred. This shows compared to FIG. 1 greatly increases the shaft seals located on the pump shaft 6 22, 24, 25. All three shaft seals 22, 24, 25 have one against the pump shaft 6 Sealing lip 26, 27, 28. The sealing lips 26, 27 of the shaft sealing rings 24, 25, which the transmission space 11 to the atmosphere and seal towards the neutral space 7 in the direction of the delivery chamber 2. The sealing lip 28 of the Shaft sealing ring 22 points away from the delivery chamber 2.

Die Figur 2 lässt weiterhin erkennen, dass der Stehlagerraum 16 einen Druckmittelanschluss 30 hat und dieser Druckmittelanschluss 30 durch eine Leitung 29 mit dem Druckmittelanschluss 10 des rechten neutralen Raumes 8 verbunden ist. An diese Leitung 29 ist auch der linke neutrale Raum 7 angeschlossen. Sie hat Verbindung mit der Saugseite der Maschinenstufe.Figure 2 also shows that the pillow block 16 has a pressure medium connection 30 and this Pressure medium connection 30 through a line 29 to the Pressure medium connection 10 of the right neutral room 8 connected is. The left one is also connected to this line 29 neutral room 7 connected. It is connected to the Suction side of the machine stage.

Nicht dargestellt ist eine Ausführungsform, bei der die Pumpenwellen 5, 6 die Stehlagerräume 15, 16 durchdringen und dann mit entsprechenden Pumpenwellen eines zweiten Drehzahnverdichters verbunden sind. Bei einer solchen Ausführungsform empfiehlt sich wiederum die zuvor für den Getrieberaum und den neutralen Raum beschriebene, abgestufte Druckbeaufschlagung. An embodiment is not shown in which the Pump shafts 5, 6 penetrate the plummer block 15, 16 and then with corresponding pump shafts from a second one Rotary tooth compressor are connected. With one The embodiment is again recommended for the Gear room and the neutral room described, graded Pressurization.

BezugszeichenlisteReference list

11
Gehäusecasing
22nd
FörderraumFunding area
33rd
Rotorrotor
44th
Rotorrotor
55
PumpenwellePump shaft
66
PumpenwellePump shaft
77
neutraler Raumneutral space
88th
neutraler Raumneutral space
99
DruckmittelanschlussPressure medium connection
1010th
DruckmittelanschlussPressure medium connection
1111
GetrieberaumGearbox
1212th
DruckmittelanschlussPressure medium connection
1313
Getriebetransmission
1414
Motorengine
1515
StehlagerraumPedestal storage room
1616
StehlagerraumPedestal storage room
1717th
LabyrinthabdichtungLabyrinth seal
1818th
LabyrinthabdichtungLabyrinth seal
1919th
LabyrinthabdichtungLabyrinth seal
2020th
Labyrinthabdichtung Labyrinth seal
2121
WellendichtringShaft seal
2222
WellendichtringShaft seal
2323
WellendichtringShaft seal
2424th
WellendichtringShaft seal
2525th
WellendichtringShaft seal
2626
DichtlippeSealing lip
2727
DichtlippeSealing lip
2828
DichtlippeSealing lip
2929
Leitungmanagement
3030th
DruckmittelanschlussPressure medium connection
3131
SpülgasquellePurge gas source
3232
ÜberströmventilOverflow valve

Claims (7)

Drehzahnverdichter mit einer einen Getrieberaum (11), einen neutralen Raum (7) und einen Förderraum (2) durchdringenden ersten Pumpenwelle (6) und einer hierzu parallelen zweiten Pumpenwelle (5), welche von dem Getrieberaum (11) durch den neutralen Raum (7) und den Förderraum (2) führt, wobei die beiden Pumpenwellen (5, 6) jeweils in dem Förderraum (2) einen Rotor (3, 4) aufweisen und wobei der Förderraum (2) zur Durchführung der beiden Pumpenwellen (5, 6) jeweils durch eine Labyrinthabdichtung (17, 18, 19, 20) gegenüber dem neutralen Raum (7, 8) abgedichtet ist, dadurch gekennzeichnet, dass der Getrieberaum (11) und der neutrale Raum (7) druckdicht ausgeführt und jeweils mit einem Druckmittelanschluss (9, 12) versehen sind, dass die beiden Pumpenwellen (5, 6) zwischen dem Förderraum (2) und dem Getrieberaum (11) und die aus dem Getrieberaum (11) nach außen herausführende Pumpenwelle (6) zwischen der Atmosphäre und dem Getrieberaum (11) jeweils durch einen Wellendichtring (24, 25) abgedichtet sind, welcher eine gegen die jeweilige Pumpenwelle (5, 6) anliegende, zum Förderraum (2) hin gerichtete Dichtlippe (27, 26) aufweist.Rotary tooth compressor with a first pump shaft (6) penetrating a gear chamber (11), a neutral chamber (7) and a delivery chamber (2) and a second pump shaft (5) parallel to this, which runs from the gear chamber (11) through the neutral chamber (7 ) and the delivery chamber (2), the two pump shafts (5, 6) each having a rotor (3, 4) in the delivery chamber (2) and the delivery chamber (2) for carrying out the two pump shafts (5, 6) each is sealed off from the neutral space (7, 8) by a labyrinth seal (17, 18, 19, 20), characterized in that the gear space (11) and the neutral space (7) are designed to be pressure-tight and each with a pressure medium connection (9 , 12) are provided such that the two pump shafts (5, 6) between the delivery chamber (2) and the gear chamber (11) and the pump shaft (6) leading outwards from the gear chamber (11) between the atmosphere and the gear chamber (11 ) each with a shaft seal (24, 25) are sealed, which has a sealing lip (27, 26) which bears against the respective pump shaft (5, 6) and faces the delivery chamber (2). Drehzahnverdichter nach Anspruch 1, bei dem die beiden Pumpenwellen (5, 6) an der dem Getrieberaum (11) gegenüberliegenden Seite des Förderraumes (2) jeweils in einem Stehlagerraum (16) gelagert sind, wobei zwischen dem Stehlagerraum (16) und dem Förderraum (2) ebenfalls ein neutraler Raum (8) vorgesehen ist, dadurch gekennzeichnet, dass der Stehlagerraum (15, 16) und der zwischen ihm und dem Förderraum (2) liegende neutrale Raum (8) druckdicht ausgeführt und jeweils mit einem Druckmittelanschluss (10, 30) versehen sind und dass jeder Stehlagerraum (15, 16) durch eine gegen die Pumpenwelle (5, 6) mit einer Dichtlippe anliegende Wellendichtring abgedichtet ist.Rotary tooth compressor according to Claim 1, in which the two pump shafts (5, 6) are each mounted in a plummer block storage space (16) on the side of the delivery chamber (2) opposite the gear chamber (11), with between the plummer block storage room (16) and the delivery chamber ( 2) a neutral space (8) is also provided, characterized in that the pillow block space (15, 16) and the neutral space (8) lying between it and the delivery space (2) are designed to be pressure-tight and each have a pressure medium connection (10, 30 ) are provided and that each pillow block (15, 16) is sealed by a shaft sealing ring that bears against the pump shaft (5, 6) with a sealing lip. Drehzahnverdichter nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass die beiden neutralen Räume (7, 8) jeweils mit der Saugseite des Drehzahnverdichters Verbindung haben.Rotary tooth compressor according to claims 1 or 2, characterized in that the two neutral spaces (7, 8) each have a connection to the suction side of the rotary tooth compressor. Verfahren zum Betrieb eines Drehzahlverdichters nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der getrieberaumseitige, neutrale Raum mit einem unter dem Druck im Förderraum liegenden Druck und der Getrieberaum mit einem unter dem Druck in den Förderräumen jedoch über dem Atmosphärendruck liegenden Druck beaufschlagt wird.Method for operating a speed compressor according to one of the preceding claims, characterized in that the gearbox-side, neutral space with a pressure below the pressure in the delivery chamber and the gearbox with a pressure below the pressure in the delivery spaces but above atmospheric pressure. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass auch der stehlagerraumseitige, neutrale Raum mit einem unter dem Druck im Förderraum liegenden Druck beaufschlagt wird.Method according to Claim 4, characterized in that the neutral space on the pedestal storage space side is also subjected to a pressure below the pressure in the delivery space. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass der Stehlagerraum und der ihn vom Förderraum trennende neutrale Raum an eine gemeinsame Druckmittelquelle angeschlossen sind.A method according to claim 5, characterized in that the pillow block and the neutral space separating it from the delivery chamber are connected to a common pressure medium source. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die neutralen Räume zur Druckbeaufschlagung mit einer Spülgasquelle verbunden sind und jeweils einen durch ein Überströmventil geregelten Spülgasauslass aufweisen.Method according to one of the preceding claims, characterized in that the neutral spaces for pressurization are connected to a purge gas source and each have a purge gas outlet regulated by an overflow valve.
EP99109591A 1998-05-18 1999-05-14 Rotary gear compressor and method for its operation Expired - Lifetime EP0959251B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19822283A DE19822283A1 (en) 1998-05-18 1998-05-18 Rotary tooth compressor and method for operating one
DE19822283 1998-05-18

Publications (2)

Publication Number Publication Date
EP0959251A1 true EP0959251A1 (en) 1999-11-24
EP0959251B1 EP0959251B1 (en) 2004-05-19

Family

ID=7868186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99109591A Expired - Lifetime EP0959251B1 (en) 1998-05-18 1999-05-14 Rotary gear compressor and method for its operation

Country Status (3)

Country Link
EP (1) EP0959251B1 (en)
AT (1) ATE267346T1 (en)
DE (2) DE19822283A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236902A2 (en) * 2001-02-28 2002-09-04 Kabushiki Kaisha Toyota Jidoshokki Shaft seal structure of vacuum pumps
WO2007065487A1 (en) * 2005-12-08 2007-06-14 Ghh Rand Schraubenkompressoren Gmbh Helical screw compressor
CN100400881C (en) * 2002-08-23 2008-07-09 株式会社丰田自动织机 Axle sealing structure for vacuum pump
ITVI20130021A1 (en) * 2013-01-31 2013-05-02 Virgilio Mietto VOLUMETRIC COMPRESSOR EQUIPPED WITH A IMPROVED LUBRICATION SYSTEM.
EP3341602A4 (en) * 2015-08-25 2019-06-19 Eaton Intelligent Power Limited High pressure rotor seal configuration for supercharger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB559226A (en) * 1942-08-07 1944-02-09 Douglas Rudolf Pobjoy Improvements in and relating to rotary pumps
GB2116634A (en) * 1982-03-10 1983-09-28 Fiat Auto Spa Rotary positive-displacement fluid-machines
JPH05296171A (en) * 1992-04-13 1993-11-09 Ulvac Japan Ltd Shaft seal mechanism for positive displacement vacuum pump without using sealing fluid
EP0775812A1 (en) * 1995-11-22 1997-05-28 Ishikawajima-Harima Heavy Industries Co., Ltd. Seal arrangement for engine-driven supercharger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755115A (en) * 1984-11-21 1988-07-05 Atsugi Motor Parts Company, Limited Shaft seal assembly for compressor
DE4301293C2 (en) * 1993-01-15 1996-07-11 Mannesmann Ag Device for removing small amounts of lubricant and coolant leaks
DE29506010U1 (en) * 1995-04-07 1996-08-08 Armatec FTS-Armaturen GmbH & Co KG, 88239 Wangen Rotary lobe pump
DE19626515A1 (en) * 1996-07-02 1998-01-08 Ghh Borsig Turbomaschinen Gmbh Sealing rings for screw compressor
DE19633651A1 (en) * 1996-08-21 1998-02-26 Leybold Vakuum Gmbh Dry vacuum machine with shaft passage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB559226A (en) * 1942-08-07 1944-02-09 Douglas Rudolf Pobjoy Improvements in and relating to rotary pumps
GB2116634A (en) * 1982-03-10 1983-09-28 Fiat Auto Spa Rotary positive-displacement fluid-machines
JPH05296171A (en) * 1992-04-13 1993-11-09 Ulvac Japan Ltd Shaft seal mechanism for positive displacement vacuum pump without using sealing fluid
EP0775812A1 (en) * 1995-11-22 1997-05-28 Ishikawajima-Harima Heavy Industries Co., Ltd. Seal arrangement for engine-driven supercharger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 18, no. 90 (M - 1560) 15 February 1994 (1994-02-15) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236902A2 (en) * 2001-02-28 2002-09-04 Kabushiki Kaisha Toyota Jidoshokki Shaft seal structure of vacuum pumps
EP1236902A3 (en) * 2001-02-28 2004-04-14 Kabushiki Kaisha Toyota Jidoshokki Shaft seal structure of vacuum pumps
CN100400881C (en) * 2002-08-23 2008-07-09 株式会社丰田自动织机 Axle sealing structure for vacuum pump
WO2007065487A1 (en) * 2005-12-08 2007-06-14 Ghh Rand Schraubenkompressoren Gmbh Helical screw compressor
US7713039B2 (en) 2005-12-08 2010-05-11 Gmbh Rand Schraubenkowpressoren Gmbh Helical screw compressor having a vented sealing arrangement
US9091268B2 (en) 2005-12-08 2015-07-28 Ghh Rand Schraubenkompressoren Gmbh Three-stage screw compressor
ITVI20130021A1 (en) * 2013-01-31 2013-05-02 Virgilio Mietto VOLUMETRIC COMPRESSOR EQUIPPED WITH A IMPROVED LUBRICATION SYSTEM.
EP3341602A4 (en) * 2015-08-25 2019-06-19 Eaton Intelligent Power Limited High pressure rotor seal configuration for supercharger

Also Published As

Publication number Publication date
DE19822283A1 (en) 1999-11-25
ATE267346T1 (en) 2004-06-15
DE59909504D1 (en) 2004-06-24
EP0959251B1 (en) 2004-05-19

Similar Documents

Publication Publication Date Title
EP0030619B1 (en) Rotor compressor, especially screw rotor compressor, with lubricant supply to and drainage thereof from the bearings
DE60113894T2 (en) sealing arrangements
DE2441520A1 (en) SHAFT SEAL FOR SCREW ROTOR COMPRESSOR
DE2750137A1 (en) CENTRIFUGAL PUMP OR -COMPRESSOR
WO2008022916A1 (en) Method for reacting self-igniting dusts in a vacuum pump device
DE4005428A1 (en) LOCKING FLUID SEAL ARRANGEMENT IN A TURBO COMPRESSOR
EP0964999A1 (en) Vacuum pump
DE10003018B4 (en) Turbo compressor
DE3722164C2 (en) Turbomolecular pump
EP0959251B1 (en) Rotary gear compressor and method for its operation
CH628709A5 (en) Roots pump
DE3617889C2 (en)
DE1939717A1 (en) Roots pump
EP3371458B1 (en) Dry vacuum pump
EP0653566A1 (en) Gear driven compressor for the compression of oxygen
DE8415459U1 (en) ROTOR SHAFT BEARING DEVICE FOR A ROTARY PISTON COMPRESSOR
EP0990798A1 (en) Turbo compressor
DE10122993A1 (en) Device to close opening in wall of transmission housing consists of air-permeable diaphragm for air pressure compensation between transmission interior and outside
EP0198936B1 (en) Multistage vacuum pump
DE1528974A1 (en) Pump, especially gear pump
DE2639127A1 (en) ROTATING LISTON DEVICE
EP0881392B1 (en) Arrangement for sealing a shaft passage in gear pumps
EP1006300A2 (en) Sealing arrangement
AT203615B (en) Helical gear machine, in particular a helical gear compressor
DE2333613A1 (en) OIL SEAL DEVICE FOR THE ROTOR OF A ROTATING PISTON COMBUSTION MACHINE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000517

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL

RBV Designated contracting states (corrected)

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040519

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20040519

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040519

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040519

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040519

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040519

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: GERMAN

REF Corresponds to:

Ref document number: 59909504

Country of ref document: DE

Date of ref document: 20040624

Kind code of ref document: P

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: PPS POLYVALENT PATENT SERVICE AG

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040819

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040819

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040819

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040830

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 20040519

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20050222

EN Fr: translation not filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050514

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050531

BERE Be: lapsed

Owner name: *SGI-PROZESS-TECHNIK G.M.B.H.

Effective date: 20050531

BERE Be: lapsed

Owner name: *SGI-PROZESS-TECHNIK G.M.B.H.

Effective date: 20050531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041019

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20080410

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20090525

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20090518

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090514

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101201