WO1998007988A1 - Dry vacuum machine with shaft passage - Google Patents
Dry vacuum machine with shaft passage Download PDFInfo
- Publication number
- WO1998007988A1 WO1998007988A1 PCT/EP1997/003072 EP9703072W WO9807988A1 WO 1998007988 A1 WO1998007988 A1 WO 1998007988A1 EP 9703072 W EP9703072 W EP 9703072W WO 9807988 A1 WO9807988 A1 WO 9807988A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- machine according
- sealing ring
- bushing
- lip
- 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.)
- Ceased
Links
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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/324—Arrangements for lubrication or cooling of the sealing itself
Definitions
- the invention relates to a dry vacuum machine, in particular a rotary piston vacuum pump, with the features of the preamble of claim 1.
- Vacuum pumps are being used more and more frequently in technical fields, for example in semiconductor technology, which require the generation of an absolutely hydrocarbon-free vacuum. Only oil-free high and backing pumps can be used. With these pumps, means must be used that take over the lubrication and cooling functions of the oil. Oil lubrication in the scooping area of a rotary piston pump can be dispensed with, for example, if the piston rotates in the scooping area without contact. However, the tion of the heat that is generated both in the piston and in the area of the shaft sealing rings is particularly difficult, since the vacuum in the scooping chamber has the effect of particularly good thermal insulation for the piston, which rotates without contact.
- the present invention has for its object to equip a vacuum machine of the type mentioned with improved means for heat dissipation.
- a special task is to dissipate the heat generated in the area of the shaft bushing in such a way that it has no influence on the heat balance of the piston.
- the general object is achieved in that the shaft at the level of the sealing ring lip is equipped with a bushing which projects into the outer space and is equipped with cooling surfaces there.
- FIGS. 1 and 2. Show it:
- Vacuum machine in which both the heat generated in the piston and in the area of the shaft sealing ring is conducted to the outside and
- the figures each show a partial section through a rotary piston vacuum pump 1 with a piston 2, which rotates during operation in the pump chamber 3, formed by the pump chamber housing 4 with the partition 5.
- the shaft 6 of the piston 2 is guided through an opening 7 in the partition 5 to the outside (outer space 8). Shaft bearings are not shown in detail.
- the outwardly guided shaft 6 can be coupled to a drive motor, for example.
- a shaft sealing ring 11 of conventional design In the opening 7 of the partition 5 there is a shaft sealing ring 11 of conventional design, the lip 12 of which faces the shaft 6.
- a housing-fixed ring 13 surrounding the shaft 6 forms, together with the interior of the shaft sealing ring 11, a cavity 14 which is filled with a lubricating grease which lubricates the shaft sealing ring lip 12.
- the ring 13 and the opening of the shaft sealing ring 11 face the pump chamber 3.
- blades 16 which rotate together with the bushing 15 or the shaft 6.
- the bushing 15 has direct thermal contact with the shaft 6 and with a running layer 17 assigned to the lip 12 of the shaft sealing ring, so that heat which arises both in the piston 2 and reaches the bushing 15 via the shaft 6 and also in the region of the running layer 17 the blades 16 is discharged to the outside.
- a bushing 21 is provided which is thermally insulated from the shaft 6. This is achieved by means of an insulating layer 22 in the form of a tubular section, which is located between the bushing 21 and the shaft 6.
- the bushes 15 and 21 as well as the blades 16 and the annular disk 23 must be made of a good heat-conducting material, for example aluminum or copper.
- Plastic or aluminum oxide (Al 2 O 3) can be used as the material for the insulating layer 22.
- the running layer 17 for the lip 12 of the shaft sealing ring 11 should be made relatively thin and hard and also consist of a good heat-conducting material, for example hardened aluminum or chrome.
- the shaft 6 is equipped with an annular groove 25. It serves to receive a sealing ring 26, which serves to seal the scoop chamber 3 to the outside.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
Description
Trockene Vakuummasc ine mit WellendurchführungDry vacuum system with shaft passage
Die Erfindung betrifft eine trockene Va uummaschine, insbesondere Rotationskolbenvakuumpumpe, mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a dry vacuum machine, in particular a rotary piston vacuum pump, with the features of the preamble of claim 1.
Beim Betrieb von Rotationskolbenvakuumpumpen ist die Entstehung von Warme im Schöpfraum und im Bereich der Wellendichtringe unvermeidbar. Bei Rotationskolbenpumpen, bei denen im Schöpfräum Öl vorhanden ist, ist das Problem der Abführung der Wärme in einfacher Weise beherrschbar. Das in aller Regel im Kreislauf geführte Öl hat neben anderen Aufgaben die Wirkung, daß die im Schöpfraum rotierenden, kreisenden oder sich hin und her bewegenden Kolben geschmiert werden und daß die während des Betriebs der Maschine entstehende Wärme abgeführt wird.When operating rotary piston vacuum pumps, the generation of heat in the pumping chamber and in the area of the shaft seals is unavoidable. With rotary piston pumps in which oil is present in the pump chamber, the problem of dissipating the heat can be mastered in a simple manner. The oil, which is generally circulated, has, among other things, the effect that the pistons rotating, rotating or reciprocating in the pumping chamber are lubricated and that the heat generated during the operation of the machine is dissipated.
Der Einsatz von Vakuumpumpen erfolgt immer häufiger in technischen Gebieten, zum Beispiel in der Halbleitertechnik, die die Erzeugung eines absolut kohlenwasser- stoffreien Vakuums fordern. Nur ölfreie Hoch- und Vorvakuumpumpen können verwendet werden. Bei diesen Pumpen müssen Mittel eingesetzt werden, die die Schmier- und Kühlfunktionen des Öls übernehmen. Auf eine Ölschmierung im Schöpfraum einer Rotationskolbenpumpe kann zum Beispiel verzichtet werden, wenn sich der Kolben berührungsfrei im Schöpfräum dreht. Allerdings ist die Abfüh- rung der Wärme, die sowohl im Kolben als auch im Bereich der Wellendichtringe entsteht, besonders schwierig, da das im Schöpfraum vorhandene Vakuum für den sich berührungsfrei drehenden Kolben die Wirkung einer besonders guten Wärmeisolierung hat.Vacuum pumps are being used more and more frequently in technical fields, for example in semiconductor technology, which require the generation of an absolutely hydrocarbon-free vacuum. Only oil-free high and backing pumps can be used. With these pumps, means must be used that take over the lubrication and cooling functions of the oil. Oil lubrication in the scooping area of a rotary piston pump can be dispensed with, for example, if the piston rotates in the scooping area without contact. However, the tion of the heat that is generated both in the piston and in the area of the shaft sealing rings is particularly difficult, since the vacuum in the scooping chamber has the effect of particularly good thermal insulation for the piston, which rotates without contact.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vakuummaschine der eingangs erwähnten Art mit verbesserten Mitteln zur Wärmeabfuhr auszurüsten. Eine spezielle Aufgabe besteht darin, die im Bereich der Wellendurchführung entstehende Wärme derart abzuführen, daß sie auf den Wärmehaushalt des Kolbens keinen Einfluß hat.The present invention has for its object to equip a vacuum machine of the type mentioned with improved means for heat dissipation. A special task is to dissipate the heat generated in the area of the shaft bushing in such a way that it has no influence on the heat balance of the piston.
Erfindungsgemäß wird die allgemeine Aufgabe dadurch gelöst, daß die Welle in Höhe der Dichtringlippe mit einer Buchse ausgerüstet ist, die in den äußeren Raum hineinragt und dort mit Kühlflächen ausgerüstet ist. Durch diese Maßnahmen wird erreicht, daß sowohl die im Kontaktbereich zwischen Dichtlippe und Laufbuchse entstehende Wärme als auch die vom Kolben über die Welle auf die Buchse übergehende Wärme in Richtung der Kühlflächen abgeführt wird. Die Kühlflächen können als Ringscheibe oder als Schaufelrad ausgebildet sein, so daß sie infolge ihrer Drehung einen intensiven Kontakt mit der im äußeren Raum vorhandenen Atmosphäre haben.According to the invention, the general object is achieved in that the shaft at the level of the sealing ring lip is equipped with a bushing which projects into the outer space and is equipped with cooling surfaces there. These measures ensure that both the heat generated in the contact area between the sealing lip and the liner and the heat transferred from the piston via the shaft to the socket are dissipated in the direction of the cooling surfaces. The cooling surfaces can be designed as an annular disk or as a paddle wheel, so that due to their rotation they have intensive contact with the atmosphere present in the outer space.
Die geschilderte Lösung setzt voraus, daß zwischen der Buchse und der Welle ein guter thermischer Kontakt besteht, damit auch die im Schöpfräum bzw. im Kolben entstehende Wärme zu den Kühlflächen geführt werden kann. Ist allerdings die Reibungswärme, die im Bereich des Wellendichtringes entsteht, so hoch, daß sie über die Buchse und über die Welle die Temperatur des Kolbens noch erhöhen würde, dann ist es zweckmäßig, zwischen der Laufbuchse und der Welle eine thermische Isolierung vorzusehen. Diese Isolierung bewirkt, daß im Bereich der Dichtlippe des Wellendichtringes entstehende Wärme nicht mehr von der Buchse auf die Welle übergeht, den Kolben also nicht erreichen kann. Zu einer Temperaturerhöhung des Kolbens trägt die im Bereich des Wellendichtringes entstehende Wärme nicht bei.The solution described assumes that there is good thermal contact between the bushing and the shaft, so that the heat generated in the pump chamber or in the piston can also be conducted to the cooling surfaces. However, if the frictional heat generated in the area of the shaft sealing ring is so high that it would increase the temperature of the piston via the bushing and the shaft, then it is expedient to provide thermal insulation between the bushing and the shaft. This insulation causes that in the area of Sealing lip of the shaft sealing ring no longer generates heat that is transferred from the bush to the shaft, and therefore cannot reach the piston. The heat generated in the area of the shaft sealing ring does not contribute to an increase in the temperature of the piston.
Weitere Vorteile und Einzelheiten der Erfindung sollen anhand in den Figuren 1 und 2 dargestellten Ausführungsbeispielen erläutert werden. Es zeigen:Further advantages and details of the invention will be explained with reference to the exemplary embodiments shown in FIGS. 1 and 2. Show it:
Figur 1 einen Teilschnitt durch eine trockene1 shows a partial section through a dry
Vakuummaschine, bei der sowohl die im Kolben als auch im Bereich des Wellendichtringes entstehende Wärme nach außen geführt wird undVacuum machine in which both the heat generated in the piston and in the area of the shaft sealing ring is conducted to the outside and
Figur 2, eine Maschine, bei der nur im Bereich des Wellendichtringes entstehende Wärme nach außen geführt wird.Figure 2, a machine in which heat generated only in the area of the shaft seal is conducted to the outside.
Die Figuren zeigen jeweils einen Teilschnitt durch eine Rotationskolbenvakuumpumpe 1 mit einem Kolben 2 , der während des Betriebs im Schöpfräum 3, gebildet vom Schöpfraumgehäuse 4 mit der Trennwand 5, rotiert. Die Welle 6 des Kolbens 2 ist durch eine Öffnung 7 in der Trennwand 5 nach außen (äußerer Raum 8) geführt. Wellenlagerungen sind im einzelnen nicht dargestellt. Die nach außen geführte Welle 6 kann zum Beispiel mit einem Antriebsmotor gekoppelt sein.The figures each show a partial section through a rotary piston vacuum pump 1 with a piston 2, which rotates during operation in the pump chamber 3, formed by the pump chamber housing 4 with the partition 5. The shaft 6 of the piston 2 is guided through an opening 7 in the partition 5 to the outside (outer space 8). Shaft bearings are not shown in detail. The outwardly guided shaft 6 can be coupled to a drive motor, for example.
In der Öffnung 7 der Trennwand 5 befindet sich ein Wel- lendichtring 11 üblicher Bauart, dessen Lippe 12 der Welle 6 zugewandt ist. Ein gehäusefester, die Welle 6 umgebender Ring 13 bildet zusammen mit dem Innenraum des Wellendichtringes 11 einen Hohlraum 14, der mit einem der Schmierung der Wellendichtringlippe 12 dienenden Schmierfett gefüllt ist. Der Ring 13 und die Öffnung des Wellendichtringes 11 sind dem Schöpfräum 3 zugewandt. Beim Ausführungsbeispiel nach Figur 1 befindet sich in Höhe des Wellendichtringes 11 eine Buchse 15, die sich gemeinsam mit der Welle 6 nach außen erstreckt. Dort ist sie mit Schaufeln 16 ausgerüstet, die gemeinsam mit der Buchse 15 bzw. der Welle 6 rotieren. Die Buchse 15 hat unmittelbaren thermischen Kontakt mit der Welle 6 und mit einer der Lippe 12 des Wellendichtrings zugeordneten LaufSchicht 17, so daß sowohl im Kolben 2 entstehende und über die Welle 6 zur Buchse 15 gelangende Wärme als auch im Bereich der Laufschicht 17 entstehende Wärme zu den Schaufeln 16 nach außen abgeführt wird.In the opening 7 of the partition 5 there is a shaft sealing ring 11 of conventional design, the lip 12 of which faces the shaft 6. A housing-fixed ring 13 surrounding the shaft 6 forms, together with the interior of the shaft sealing ring 11, a cavity 14 which is filled with a lubricating grease which lubricates the shaft sealing ring lip 12. The ring 13 and the opening of the shaft sealing ring 11 face the pump chamber 3. In the exemplary embodiment according to FIG. 1 there is a bushing 15 at the level of the shaft sealing ring 11, which bushing extends outwards together with the shaft 6. There it is equipped with blades 16 which rotate together with the bushing 15 or the shaft 6. The bushing 15 has direct thermal contact with the shaft 6 and with a running layer 17 assigned to the lip 12 of the shaft sealing ring, so that heat which arises both in the piston 2 and reaches the bushing 15 via the shaft 6 and also in the region of the running layer 17 the blades 16 is discharged to the outside.
Beim Ausführungsbeispiel nach Figur 2 ist eine Buchse 21 vorgesehen, die gegenüber der Welle 6 wärmeisoliert ist. Dieses wird erreicht durch eine rohrabschnittförmige Isolierschicht 22, die sich zwischen Buchse 21 und Welle 6 befindet.In the embodiment according to FIG. 2, a bushing 21 is provided which is thermally insulated from the shaft 6. This is achieved by means of an insulating layer 22 in the form of a tubular section, which is located between the bushing 21 and the shaft 6.
Infolge der Isolierschicht 22 wird erreicht, daß ein Wärmeübergang zwischen Welle 6 und Buchse 21 nicht stattfindet. Im Bereich der Lippe 12 des Wellendichtringes bzw. der Laufschicht 17 entstehende Wärme kann also nicht zum Kolben 2 gelangen. Nur die im Bereich der Dichtlippe 12 des Wellendichtringes 11 entstehende Wärme wird nach außen abgeführt. Anstelle der Schaufeln 16 nach Figur 1 trägt die Buchse 21 eine Kreisringscheibe 23, welche die gewünschten Kühlflächen bildet.As a result of the insulating layer 22, heat transfer between shaft 6 and bushing 21 does not take place. Heat generated in the area of the lip 12 of the shaft sealing ring or the running layer 17 cannot reach the piston 2. Only the heat generated in the area of the sealing lip 12 of the shaft sealing ring 11 is dissipated to the outside. Instead of the blades 16 according to FIG. 1, the bushing 21 carries an annular disk 23 which forms the desired cooling surfaces.
Die Buchsen 15 und 21 sowie die Schaufeln 16 bzw. die Kreisringscheibe 23 müssen aus einem gut wärmeleitenden Werkstoff bestehen, zum Beispiel Aluminium oder Kupfer. Als Werkstoff für die Isolierschicht 22 kommt Kunststoff oder Aluminium-Oxid (AI2 O3) in Frage. Die LaufSchicht 17 für die Lippe 12 des Wellendichtringes 11 sollte relativ dünn und hart ausgebildet sein und außerdem aus gut wärmeleitendem Werkstoff, zum Beispiel gehärtetes Aluminium oder Chrom, bestehen. In Höhe der Buchse 15 bzw. 21 ist die Welle 6 mit einer Ringnut 25 ausgerüstet. Sie dient der Aufnahme eines Dichtringes 26, der der Abdichtung des Schöpfraumes 3 nach außen dient. The bushes 15 and 21 as well as the blades 16 and the annular disk 23 must be made of a good heat-conducting material, for example aluminum or copper. Plastic or aluminum oxide (Al 2 O 3) can be used as the material for the insulating layer 22. The running layer 17 for the lip 12 of the shaft sealing ring 11 should be made relatively thin and hard and also consist of a good heat-conducting material, for example hardened aluminum or chrome. At the height of the bushing 15 and 21, the shaft 6 is equipped with an annular groove 25. It serves to receive a sealing ring 26, which serves to seal the scoop chamber 3 to the outside.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97929175A EP0920590A1 (en) | 1996-08-21 | 1997-06-12 | Dry vacuum machine with shaft passage |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19633651.1 | 1996-08-21 | ||
| DE19633651A DE19633651A1 (en) | 1996-08-21 | 1996-08-21 | Dry vacuum machine with shaft passage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998007988A1 true WO1998007988A1 (en) | 1998-02-26 |
Family
ID=7803201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1997/003072 Ceased WO1998007988A1 (en) | 1996-08-21 | 1997-06-12 | Dry vacuum machine with shaft passage |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0920590A1 (en) |
| DE (1) | DE19633651A1 (en) |
| WO (1) | WO1998007988A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19963170A1 (en) * | 1999-12-27 | 2001-06-28 | Leybold Vakuum Gmbh | Vacuum pump with shaft sealant |
| WO2010144022A1 (en) * | 2009-06-12 | 2010-12-16 | Alfa Laval Corporate Ab | Cooling device for spindle sealing and/or bearing means |
| US8753079B2 (en) | 2009-03-16 | 2014-06-17 | Vulco S.A. | Mechanical seal |
| WO2022199984A1 (en) * | 2021-03-26 | 2022-09-29 | Zf Friedrichshafen Ag | Arrangement for sealing a rotor shaft of an electric machine, electric machine and drive device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19822283A1 (en) * | 1998-05-18 | 1999-11-25 | Sgi Prozess Technik Gmbh | Rotary tooth compressor and method for operating one |
| CN105275820B (en) * | 2014-07-07 | 2017-06-16 | 上海汉钟精机股份有限公司 | Dry vacuum Pump Shaft Seal is centrifuged cooling body |
| DE102019214793A1 (en) * | 2019-09-26 | 2021-04-01 | Zf Friedrichshafen Ag | Arrangement for mounting and sealing a rotor shaft |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB850767A (en) * | 1958-09-24 | 1960-10-05 | J & A Hillman Ltd | An improved oil-retaining and dirt-excluding seal for use in association with relatively rotating parts |
| GB1038019A (en) * | 1963-09-19 | 1966-08-03 | Acec | Improvements in seals for rotary shafts |
| DE2331412A1 (en) * | 1973-06-20 | 1975-01-23 | Freudenberg Carl Fa | Seal for high speed roller bearings - maintains supply of lubricant by fan to seal lip to reduce wear |
| DE3212477A1 (en) * | 1982-04-03 | 1983-11-03 | Goetze Ag, 5093 Burscheid | Shaft sealing ring |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2625153C2 (en) * | 1976-06-04 | 1983-07-14 | Leybold-Heraeus GmbH, 5000 Köln | Shaft seal |
| US4606712A (en) * | 1984-11-14 | 1986-08-19 | Abex Corporation | Self-pumping pump shaft seal |
| JPH06346883A (en) * | 1993-06-07 | 1994-12-20 | Orion Mach Co Ltd | Vane pump cooling device |
-
1996
- 1996-08-21 DE DE19633651A patent/DE19633651A1/en not_active Withdrawn
-
1997
- 1997-06-12 EP EP97929175A patent/EP0920590A1/en not_active Withdrawn
- 1997-06-12 WO PCT/EP1997/003072 patent/WO1998007988A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB850767A (en) * | 1958-09-24 | 1960-10-05 | J & A Hillman Ltd | An improved oil-retaining and dirt-excluding seal for use in association with relatively rotating parts |
| GB1038019A (en) * | 1963-09-19 | 1966-08-03 | Acec | Improvements in seals for rotary shafts |
| DE2331412A1 (en) * | 1973-06-20 | 1975-01-23 | Freudenberg Carl Fa | Seal for high speed roller bearings - maintains supply of lubricant by fan to seal lip to reduce wear |
| DE3212477A1 (en) * | 1982-04-03 | 1983-11-03 | Goetze Ag, 5093 Burscheid | Shaft sealing ring |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19963170A1 (en) * | 1999-12-27 | 2001-06-28 | Leybold Vakuum Gmbh | Vacuum pump with shaft sealant |
| US8753079B2 (en) | 2009-03-16 | 2014-06-17 | Vulco S.A. | Mechanical seal |
| US9206906B2 (en) | 2009-03-16 | 2015-12-08 | Vulco, S.A. | Adjustable mechanical seal |
| US9249885B2 (en) | 2009-03-16 | 2016-02-02 | Vulco, S. A. | Mechanical seal with improved seal assembly |
| US9593777B2 (en) | 2009-03-16 | 2017-03-14 | Vulco S.A. | Mechanical seal |
| WO2010144022A1 (en) * | 2009-06-12 | 2010-12-16 | Alfa Laval Corporate Ab | Cooling device for spindle sealing and/or bearing means |
| US9416877B2 (en) | 2009-06-12 | 2016-08-16 | Alfa Laval Corporate Ab | Cooling device for spindle sealing and/or bearing means |
| WO2022199984A1 (en) * | 2021-03-26 | 2022-09-29 | Zf Friedrichshafen Ag | Arrangement for sealing a rotor shaft of an electric machine, electric machine and drive device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19633651A1 (en) | 1998-02-26 |
| EP0920590A1 (en) | 1999-06-09 |
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