EP3051136B1 - Vacuum pump - Google Patents

Vacuum pump Download PDF

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Publication number
EP3051136B1
EP3051136B1 EP15153082.1A EP15153082A EP3051136B1 EP 3051136 B1 EP3051136 B1 EP 3051136B1 EP 15153082 A EP15153082 A EP 15153082A EP 3051136 B1 EP3051136 B1 EP 3051136B1
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EP
European Patent Office
Prior art keywords
vacuum pump
filter element
housing section
accordance
housing
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Application number
EP15153082.1A
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German (de)
French (fr)
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EP3051136A1 (en
Inventor
Thorsten Burggraf
Timo Lange
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Pfeiffer Vacuum GmbH
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Pfeiffer Vacuum GmbH
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Priority to EP15153082.1A priority Critical patent/EP3051136B1/en
Publication of EP3051136A1 publication Critical patent/EP3051136A1/en
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    • 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
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum

Definitions

  • the present invention relates to a vacuum pump with an oil-covered rotary vane pump system.
  • Rotary vane pumps are widely used due to their versatility and reliability. They are rotary displacement pumps. They comprise a stator, in the interior of which an eccentrically mounted rotor is arranged. Sliders movably arranged in slots in the rotor slide along the inner wall of the stator when the rotor rotates. This divides a pump chamber defined by the stator into rooms with changing volumes. Oil is introduced into the pump chamber to improve the seal between the slides and the inner wall of the stator. This measure also reduces the wear on the slide.
  • Oil mist separators are usually used to remove the oil from the gas stream to be ejected.
  • Such oil separators are conventionally separate units that are connected to an exhaust flange of the pump. They are usually firmly flanged to the side of the pump housing (especially in the case of oil-circulating lubricated rotary vane pumps) or are sold separately from the pump as an optional accessory (especially in the case of rotary vane pumps covered with oil).
  • the DE 35 01 852 A1 discloses a vane vacuum pump, in which a gas stream following an oil separator passes through a post-filter mounted in the housing of the pump and is discharged to the outside via an outlet.
  • the vacuum pump has a housing in which the essential functional components of the pump are contained, namely the stator, the rotor arranged in its interior with the slides assigned to it, and the corresponding inlet and outlet valves.
  • the housing has an ejection flange for ejecting a fluid drawn in by the positive displacement pump - generally a gas or a gas mixture.
  • a filter element for filtering the fluid to be ejected is arranged in front of the ejection flange in order to separate the oil droplets contained in the fluid.
  • the filter element is integrated in a housing section detachably coupled to a base body of the housing.
  • an inexpensive and space-saving solution to the problem mentioned at the outset is achieved by integrating the oil mist separator into the housing itself.
  • oil is separated after the gas has left the pump through the discharge flange (downstream oil separation in a separate unit).
  • the solution according to the invention with an integration of the filter element into the housing is also structurally simpler and therefore cheaper than solutions for oil mist separation, which provide filter cartridges which are arranged in their own chambers inside the housing.
  • the housing section covers an outlet opening of the base body in a state coupled to the base body. That is, the base body has an outlet opening which is closed by the housing section.
  • the filter element integrated in the housing section covers the outlet opening essentially completely. The entire gas flow passing through the outlet opening is thus supplied to the filter element.
  • the discharge flange is arranged on the housing section or the discharge flange forms part of the housing section. In other words, it can also be removed from the base body if necessary, e.g. for maintenance purposes.
  • the filter element can be inserted - partially or completely - in the discharge flange.
  • the filter element can be inserted interchangeably into the housing section. This simplifies maintenance of the vacuum pump and makes it possible to choose the appropriate filter material, for example depending on the oil used and / or the process media used.
  • the filter element can have any structure. A combination of different materials, possibly in a multilayer arrangement, is quite possible.
  • the filter element comprises a filter mat.
  • it can have a reinforcing structure.
  • it has a frame.
  • the filter element is preferably an exchange module that can be easily replaced if necessary (e.g. cartridge).
  • the filter element is essentially flat or flat (eg flat cuboid or flat cylinder), which increases its production costs to reduce. If necessary, the filter element can also have a slight curvature - in sections or essentially everywhere.
  • the housing section has a depression which is connected to the discharge flange, the filter element being arranged at least partially, in particular completely, in the depression.
  • the discharge flange starts from a bottom portion of the depression.
  • the depression can have a step which is provided for contacting the filter element. This makes it possible in a simple manner to ensure correct positioning of the element in the intended position.
  • the step can be used to form a chamber in which the gas collects after it has passed through the filter element before it flows out of the housing through the discharge flange.
  • the filter element when inserted into the recess, is essentially flush with a side of the housing section facing the base body.
  • the housing section with an integrated filter element is particularly compact in this case.
  • Another optional measure to increase the efficiency of the filter element is to design it in such a way that it has an area which is at least twice as large, in particular three times as large, as the cross section of the ejection flange.
  • the filter element should have a significantly larger area than the cross section of the discharge flange, so that a maximum gas throughput through the filter element is achieved without a significant increase in dynamic pressure.
  • a protective device can be provided in the interior of the housing, which is designed and arranged in such a way that direct gating of the filter element by the lubricant present in the vacuum pump is avoided.
  • the protective device has in particular a groove-like basic shape.
  • the basic shape in a cross section resembles, at least in sections, the shape of a flat V.
  • the V does not necessarily have to be symmetrical.
  • An at least sectionally curved configuration of the protective device is also conceivable.
  • the protective device can be, for example, a suitably shaped component, in particular sheet metal component, which is arranged at a distance from and covers the outlet opening.
  • the gas with fine oil droplets which flows directly onto the outlet opening, is deflected by the protective device and has to flow around it laterally before it reaches the outlet opening.
  • oil droplets splashing around in the housing hit the protective device and drip again without reaching the filter element.
  • oil that has separated and dripping from the filter element can be collected and discharged in a controlled manner.
  • Fig. 1 shows an oil-covered rotary vane pump 10 with a motor 12, to which a stator region 14 with an inlet flange 16 connects.
  • the inlet flange 16 is connected to the device to be evacuated in order to create a vacuum in it by the operation of the pump 10.
  • the functional components of the pump 10 that produce the pumping action are arranged in a housing 18 connected to the stator region 14.
  • the housing 18 is also referred to as a cap.
  • the housing 18 comprises a base body 20 and a housing section 22 which is arranged on the upper side of the housing 18 in the position of use of the pump 10 and which is inserted into a section of the base body 20 provided with a guide, which will be described in detail below.
  • the housing section 22 is secured in its position by a latchable rotary latch 24.
  • the housing section 22 is provided on its upper side with an ejection flange 26 through which the gas drawn in from the device to be evacuated is ejected.
  • Fig. 2 shows the pump 10 in a front view. The position of a section plane AA is also indicated. The corresponding sectional view is in Fig. 3 shown.
  • the cross-sectional representation of the Fig. 3 enables a view of a pump system 28, which - driven by the motor 12 - generates the pump power of the pump 10.
  • An oil level O (shown in dashed lines) is also shown, which is approximately present when the pump 10 is in operation. It goes without saying that the oil level O can also be higher or slightly lower. However, the position of an exhaust valve of the pump system 28 is below the oil level O.
  • the pump 10 is thus an oil-covered rotary vane pump, in which not only oil is injected into the pump chamber, but at least partially in the essential components of the pump system 28 Lubricants are arranged. Oil-covered rotary vane pumps are comparatively low-wear, reliable and powerful.
  • the operation of the pump 10 produces not inconsiderable amounts of oil droplets, which are entrained by the gas stream to be expelled, so that a droplet-gas mixture is formed (aerosol).
  • oil drops may splash around inside the housing 18 due to operation, for example due to gas flows in the pump 10.
  • a flat or flat filter element 30 is integrated in the housing section 22.
  • the housing section 22 has a recess 32 in which the filter element 30 is arranged.
  • the filter element 30 lies on a step 34 in the recess 32.
  • the oil droplets flow together with the gas through an outlet opening 36 of the housing base body 20.
  • the outlet opening 36 is closed by the housing section 22, so that the aerosol must flow through the filter element 30, the droplets being separated from the gas stream and drip down again if necessary.
  • the filter element 30 is larger than the outlet opening 36; ie the entire gas flow must pass through the filter element 30.
  • the Outlet opening 36 has a significantly larger cross section than the ejection flange 26 (not shown in section) in order to guide the droplet-gas mixture through a filter element 30 with a larger surface area, which can accordingly be made thinner.
  • a lateral outlet of the flange 26 can also be provided.
  • the outlet opening 36 spans webs 40.
  • elements supporting the filter element 30 can also be provided on the housing section 22, for example webs that span the chamber 38.
  • the filter element 30 itself can be provided with reinforcing components, for example with a frame.
  • the filter element 30 is designed in such a way that it can be exchanged in a simple manner.
  • it is a kind of "cartridge” that is held as a consumable at the place of use.
  • the housing section 22 is held in its position by the rotary latch 24 already mentioned.
  • a reliable seal between the base body 20 and the housing section 22 is produced by a sealing ring 42 surrounding the outlet opening 36.
  • Fig. 4 shows the rotary vane pump 10 in a section plane perpendicular to the section plane AA in order to further clarify the structure of the housing section 22 with an integrated filter element 30.
  • the flange 26 is - as in Fig. 3 - Not shown cut.
  • the filter element 30 is flush with a contact surface 44 of the housing section 22 facing the base body 20.
  • FIG. 5 and 6 show how the housing section 22 is inserted into the base body 20.
  • the housing section 22 has a substantially trapezoidal cross section.
  • the base of the housing section 22 engages in complementarily configured undercuts 46 of the base body 20, so that a dovetail guide is implemented which ensures a reliable connection of the components 22, 20.
  • the insertion movement of the housing section 22 is shown in 5 and 6 indicated by the arrow E.
  • Fig. 5 are also one of the already based on the Fig. 3 webs 40 and the sealing ring 42 described.
  • the view in Fig. 6 shows how the filter element 30 is inserted flush into the housing section 22.
  • the 7 and 8 show sectional views of a second embodiment 10 'of the rotary vane pump.
  • the cutting planes correspond to those in the Fig. 3 or 4 sectional views shown.
  • the rotary vane pump 10 ' is basically the same as the rotary vane pump 10.
  • an oil collecting plate 48 is provided, which is arranged in the interior of the housing 18. It is spaced from the outlet opening 36 between the opening 36 and the pumping system 28 and covers the opening 36.
  • FIG Fig. 8 It can be seen that the gas to be ejected, together with the droplets contained therein - that is to say the aerosol - must flow around the oil collecting plate 48 in order to reach the outlet opening 36.
  • the oil collecting plate 48 also serves to collect and discharge dripping oil which has been separated from the gas stream by the filtering effect of the element 30. To this end the oil collecting plate 48 is inclined to the right and has the shape of a flat V. Alternative configurations of the oil collecting plate 48 are also conceivable.
  • a labyrinth-like flow path for the gas to be expelled can also be provided, in addition or as an alternative, in order to prevent the filter element 30 from being sprayed on directly.
  • the oil collecting plate 48 is fastened to a side wall of the housing base body 20, as in particular in FIG Fig. 8 can be seen. It can be provided that the oil dripping from the filter element 30 is not returned directly into the oil sump, but instead is discharged and subsequently disposed of or returned to the pump 10 'after cleaning. This can be advantageous in applications in which contamination of the oil can be expected.
  • a drain hole not shown, can be provided for this purpose.
  • a sight glass can be provided in order to determine the state and the amount of the oil collected by the oil collecting plate and to drain this through the mentioned bore if necessary.
  • the vacuum pump according to the invention with a filter element for oil mist separation integrated in a section of the housing is distinguished by a compact design.
  • the filter element can be easily replaced, which helps to reduce maintenance costs.
  • the structurally simple and elegant solution to the problem underlying the invention also leads to a reduction in manufacturing costs compared to systems of conventional design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Description

Die vorliegende Erfindung betrifft eine Vakuumpumpe mit einem ölüberlagerten Drehschieber-Pumpsystem.The present invention relates to a vacuum pump with an oil-covered rotary vane pump system.

Drehschieberpumpen haben aufgrund ihrer Vielseitigkeit und Zuverlässigkeit einen hohen Verbreitungsgrad. Sie sind Rotationsverdrängungspumpen. Sie umfassen einen Stator, in dessen Inneren ein exzentrisch gelagerter Rotor angeordnet ist. In Schlitzen in dem Rotor beweglich angeordnete Schieber gleiten bei einer Rotation des Rotors an der Innenwand des Stators entlang. Dadurch teilen sie eine durch den Stator definierte Pumpenkammer in Räume mit sich verändernden Volumina ein. Um die Abdichtung zwischen den Schiebern und der Innenwand des Stators zu verbessern, wird Öl in die Pumpenkammer eingebracht. Diese Maßnahme verringert auch den Verschleiß der Schieber.Rotary vane pumps are widely used due to their versatility and reliability. They are rotary displacement pumps. They comprise a stator, in the interior of which an eccentrically mounted rotor is arranged. Sliders movably arranged in slots in the rotor slide along the inner wall of the stator when the rotor rotates. This divides a pump chamber defined by the stator into rooms with changing volumes. Oil is introduced into the pump chamber to improve the seal between the slides and the inner wall of the stator. This measure also reduces the wear on the slide.

Nachteilig bei Drehschieberpumpen derartiger Bauart ist jedoch, dass feine Tröpfchen des Öls während dem Verdichtungs- und Ausstoßvorgang des zu fördernden Gases von diesem mitgerissen und ausgestoßen werden. Um das Öl aus dem auszustoßenden Gasstrom wieder zu entfernen, kommen üblicherweise Ölnebelabscheider zum Einsatz. Derartige Ölnebenabscheider sind herkömmlicherweise separate Einheiten, die an einen Ausstoßflansch der Pumpe angeschlossen werden. Sie sind in der Regel seitlich fest an das Gehäuse der Pumpe angeflanscht (insbesondere bei ölumlaufgeschmierten Drehschieberpumpen) oder werden als optionales Zubehörteil separat von der Pumpe verkauft (insbesondere bei ölüberlagerten Drehschieberpumpen).A disadvantage of rotary vane pumps of this type, however, is that fine droplets of the oil are entrained and expelled by the gas to be conveyed during the compression and ejection process. Oil mist separators are usually used to remove the oil from the gas stream to be ejected. Such oil separators are conventionally separate units that are connected to an exhaust flange of the pump. They are usually firmly flanged to the side of the pump housing (especially in the case of oil-circulating lubricated rotary vane pumps) or are sold separately from the pump as an optional accessory (especially in the case of rotary vane pumps covered with oil).

Die DE 35 01 852 A1 offenbart eine Flügelzellenvakuumpumpe, bei der ein Gasstrom im Anschluss an einen Ölabscheider einen in dem Gehäuse der Pumpe gelagerten Nachfilter durchläuft und über einen Auslass ins Freie abgeführt wird.The DE 35 01 852 A1 discloses a vane vacuum pump, in which a gas stream following an oil separator passes through a post-filter mounted in the housing of the pump and is discharged to the outside via an outlet.

Es ist eine Aufgabe der vorliegenden Erfindung, eine Vakuumpumpe der eingangs genannten Art mit einem verbesserten Ölnebelabscheidersystem zu schaffen.It is an object of the present invention to provide a vacuum pump of the type mentioned at the outset with an improved oil mist separator system.

Diese Aufgabe wird durch eine Vakuumpumpe mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a vacuum pump with the features of claim 1.

Erfindungsgemäß weist die Vakuumpumpe ein Gehäuse auf, in dem die wesentlichen Funktionskomponenten der Pumpe enthalten sind, nämlich der Stator, der in dessen Inneren angeordnete Rotor mit den ihm zugeordneten Schiebern sowie die entsprechenden Einlass- und Auslassventile. Das Gehäuse weist einen Ausstoßflansch zum Ausstoß eines durch die Verdrängerpumpe angesaugten Fluids - in der Regel ein Gas oder ein Gasgemisch - auf. Dem Ausstoßflansch ist ein Filterelement zur Filterung des auszustoßenden Fluids vorgelagert, um die in dem Fluid enthaltenen Öltröpfchen abzuscheiden. Das Filterelement ist in einen lösbar mit einem Grundkörper des Gehäuses gekoppelten Gehäuseabschnitt integriert.According to the invention, the vacuum pump has a housing in which the essential functional components of the pump are contained, namely the stator, the rotor arranged in its interior with the slides assigned to it, and the corresponding inlet and outlet valves. The housing has an ejection flange for ejecting a fluid drawn in by the positive displacement pump - generally a gas or a gas mixture. A filter element for filtering the fluid to be ejected is arranged in front of the ejection flange in order to separate the oil droplets contained in the fluid. The filter element is integrated in a housing section detachably coupled to a base body of the housing.

Mit anderen Worten wird eine kostengünstige und platzsparende Lösung der eingangs genannten Aufgabe erreicht, indem die Ölnebelabscheidung in das Gehäuse selbst integriert wird. Bei herkömmlichen ölgeschmierten Drehschieberpumpen wird demgegenüber eine Ölabscheidung vorgenommen, nachdem das Gas die Pumpe durch den Ausstoßflansch verlassen hat (nachgelagerte Ölabscheidung in einer separaten Einheit). Die erfindungsgemäße Lösung mit einer Integration des Filterelements in das Gehäuse ist konstruktiv auch deutlich einfacher und daher kostengünstiger als Lösungen für die Ölnebelabscheidung, die Filterpatronen vorsehen, die in eigenen Kammern im Inneren des Gehäuses angeordnet sind.In other words, an inexpensive and space-saving solution to the problem mentioned at the outset is achieved by integrating the oil mist separator into the housing itself. In contrast, with conventional oil-lubricated rotary vane pumps, oil is separated after the gas has left the pump through the discharge flange (downstream oil separation in a separate unit). The solution according to the invention with an integration of the filter element into the housing is also structurally simpler and therefore cheaper than solutions for oil mist separation, which provide filter cartridges which are arranged in their own chambers inside the housing.

Es ist zusätzlich vorgesehen, dass der Gehäuseabschnitt in einem mit dem Grundkörper gekoppelten Zustand eine Auslassöffnung des Grundkörpers abdeckt. D.h. der Grundkörper weist eine Auslassöffnung auf, die durch den Gehäuseabschnitt verschlossen wird. Um eine möglichst effiziente Ölabscheidung zu ermöglichen, überdeckt das in den Gehäuseabschnitt integrierte Filterelement die Auslassöffnung im Wesentlichen vollständig. Somit wird die gesamte, durch die Auslassöffnung tretende Gasströmung dem Filterelement zugeführt.It is additionally provided that the housing section covers an outlet opening of the base body in a state coupled to the base body. That is, the base body has an outlet opening which is closed by the housing section. To ensure the most efficient oil separation possible enable, the filter element integrated in the housing section covers the outlet opening essentially completely. The entire gas flow passing through the outlet opening is thus supplied to the filter element.

Weitere Ausführungsformen der Erfindung sind in den Ansprüchen, der Beschreibung und den beigefügten Zeichnungen angegeben.Further embodiments of the invention are specified in the claims, the description and the accompanying drawings.

Gemäß einer Ausführungsform der erfindungsgemäßen Vakuumpumpe ist der Ausstoßflansch an dem Gehäuseabschnitt angeordnet bzw. der Ausstoßflansch bildet einen Teil des Gehäuseabschnitts. Mit anderen Worten kann er ebenfalls bei Bedarf von dem Grundkörper abgenommen werden, z.B. zu Wartungszwecken. Grundsätzlich kann das Filterelement - teilweise oder vollständig - in dem Ausstoßflansch eingesetzt sein.According to one embodiment of the vacuum pump according to the invention, the discharge flange is arranged on the housing section or the discharge flange forms part of the housing section. In other words, it can also be removed from the base body if necessary, e.g. for maintenance purposes. In principle, the filter element can be inserted - partially or completely - in the discharge flange.

Das Filterelement kann austauschbar in den Gehäuseabschnitt eingesetzt sein. Dies erleichtert die Wartung der Vakuumpumpe und ermöglicht es, das jeweils geeignete Filtermaterial zu wählen, beispielsweise in Abhängigkeit des verwendeten Öls und/oder der verwendeten Prozessmedien.The filter element can be inserted interchangeably into the housing section. This simplifies maintenance of the vacuum pump and makes it possible to choose the appropriate filter material, for example depending on the oil used and / or the process media used.

Grundsätzlich kann das Filterelement beliebig aufgebaut sein. Eine Kombination unterschiedlicher Materialien, gegebenenfalls in mehrlagiger Anordnung, ist durchaus möglich. Beispielsweise umfasst das Filterelement eine Filtermatte. Um das Filterelement zu stabilisieren, kann es eine verstärkende Struktur aufweisen. Insbesondere weist es einen Rahmen auf. Das Filterelement ist vorzugsweise ein Austauschmodul, das bei Bedarf auf einfache Weise ausgewechselt werden kann (z.B. Kartusche).In principle, the filter element can have any structure. A combination of different materials, possibly in a multilayer arrangement, is quite possible. For example, the filter element comprises a filter mat. In order to stabilize the filter element, it can have a reinforcing structure. In particular, it has a frame. The filter element is preferably an exchange module that can be easily replaced if necessary (e.g. cartridge).

Insbesondere ist das Filterelement im Wesentlichen eben oder flächig ausgestaltet (z.B. flacher Quader oder flacher Zylinder), wodurch sich dessen Herstellungskosten reduzieren. Das Filterelement kann bei Bedarf auch - abschnittsweise oder im Wesentlichen überall - eine leichte Krümmung aufweisen.In particular, the filter element is essentially flat or flat (eg flat cuboid or flat cylinder), which increases its production costs to reduce. If necessary, the filter element can also have a slight curvature - in sections or essentially everywhere.

Gemäß einer weiteren Ausführungsform der erfindungsgemäßen Vakuumpumpe weist der Gehäuseabschnitt eine Vertiefung auf, die mit dem Ausstoßflansch in Verbindung steht, wobei das Filterelement zumindest teilweise, insbesondere vollständig in der Vertiefung angeordnet ist. Insbesondere geht der Ausstoßflansch von einem Bodenabschnitt der Vertiefung ab.According to a further embodiment of the vacuum pump according to the invention, the housing section has a depression which is connected to the discharge flange, the filter element being arranged at least partially, in particular completely, in the depression. In particular, the discharge flange starts from a bottom portion of the depression.

Die Vertiefung kann eine Stufe aufweisen, die zur Anlage des Filterelements vorgesehen ist. Dadurch ist es auf einfache Weise möglich, für eine korrekte Positionierung des Elements in der vorgesehenen Lage zu sorgen. Außerdem kann mit Hilfe der Stufe eine Kammer gebildet werden, in der sich das Gas nach dem Durchtritt durch das Filterelement sammelt, bevor es durch den Ausstoßflansch aus dem Gehäuse strömt. Insbesondere schließt das Filterelement in einem in die Vertiefung eingesetzten Zustand im Wesentlichen bündig mit einer dem Grundkörper zugewandten Seite des Gehäuseabschnitts ab. Der Gehäuseabschnitt mit integriertem Filterelement ist in diesem Fall besonders kompakt.The depression can have a step which is provided for contacting the filter element. This makes it possible in a simple manner to ensure correct positioning of the element in the intended position. In addition, the step can be used to form a chamber in which the gas collects after it has passed through the filter element before it flows out of the housing through the discharge flange. In particular, the filter element, when inserted into the recess, is essentially flush with a side of the housing section facing the base body. The housing section with an integrated filter element is particularly compact in this case.

Eine weitere optionale Maßnahme zur Erhöhung der Effizienz des Filterelements besteht darin, dieses so auszugestalten, dass es eine Fläche aufweist, die zumindest doppelt so groß, insbesondere dreimal so groß ist wie der Querschnitt des Ausstoßflansches. Das Filterelement sollte eine deutlich größere Fläche als der Querschnitt des Ausstoßflansches aufweisen, so dass ein maximaler Gasdurchsatz durch das Filterelement ohne signifikante Staudruckerhöhung erreicht wird.Another optional measure to increase the efficiency of the filter element is to design it in such a way that it has an area which is at least twice as large, in particular three times as large, as the cross section of the ejection flange. The filter element should have a significantly larger area than the cross section of the discharge flange, so that a maximum gas throughput through the filter element is achieved without a significant increase in dynamic pressure.

Im Inneren des Gehäuses kann eine Schutzeinrichtung vorgesehen sein, die derart ausgestaltet und angeordnet ist, dass ein direktes Anspritzen des Filterelements durch das in der Vakuumpumpe vorhandene Schmiermittel vermieden wird.A protective device can be provided in the interior of the housing, which is designed and arranged in such a way that direct gating of the filter element by the lubricant present in the vacuum pump is avoided.

Die Schutzeinrichtung weist insbesondere eine rinnenartige Grundform auf. Beispielsweise ähnelt die Grundform in einem Querschnitt zumindest abschnittsweise der Form eines flachen V. Das V muss nicht zwingend symmetrisch ausgestaltet sein. Auch eine zumindest abschnittsweise gebogene Ausgestaltung der Schutzeinrichtung ist denkbar.The protective device has in particular a groove-like basic shape. For example, the basic shape in a cross section resembles, at least in sections, the shape of a flat V. The V does not necessarily have to be symmetrical. An at least sectionally curved configuration of the protective device is also conceivable.

Die Schutzeinrichtung kann beispielsweise ein geeignet geformtes Bauteil, insbesondere Blechbauteil sein, das beabstandet von der Auslassöffnung angeordnet ist und diese überdeckt. Das mit feinen Öltröpfchen versetzte Gas, das direkt auf die Auslassöffnung zuströmt, wird durch die Schutzeinrichtung abgelenkt und muss diese seitlich umströmen, bevor es zu der Auslassöffnung gelangt. Bei Betrieb der Pumpe in dem Gehäuse herumspritzende Öltröpfchen prallen gegen die Schutzeinrichtung und tropfen wieder ab ohne das Filterelement zu erreichen. Durch eine rinnenartige Ausgestaltung der Schutzeinrichtung kann von dem Filterelement abgeschiedenes und herabtropfendes Öl aufgefangen und in kontrollierter Weise abgeführt werden.The protective device can be, for example, a suitably shaped component, in particular sheet metal component, which is arranged at a distance from and covers the outlet opening. The gas with fine oil droplets, which flows directly onto the outlet opening, is deflected by the protective device and has to flow around it laterally before it reaches the outlet opening. When the pump is operating, oil droplets splashing around in the housing hit the protective device and drip again without reaching the filter element. Through a channel-like design of the protective device, oil that has separated and dripping from the filter element can be collected and discharged in a controlled manner.

Nachfolgend wird die vorliegende Erfindung rein beispielhaft anhand vorteilhafter Ausführungsformen unter Bezugnahme auf die beigefügten Zeichnungen erläutert. Es zeigen:

Fig. 1
eine Perspektivansicht einer ersten Ausführungsform der erfindungsgemäßen Vakuumpumpe,
Fig. 2
eine Frontansicht der in Fig. 1 gezeigten Ausführungsform,
Fig. 3
eine Schnittansicht der in Fig. 1 gezeigten Ausführungsform,
Fig. 4
eine weitere Schnittansicht der in Fig. 1 gezeigten Ausführungsform,
Fig. 5 und 6
unterschiedliche Perspektivansichten der ersten Ausführungsform der Vakuumpumpe bei einem Einschieben des Gehäuseabschnitts in den Grundkörper des Gehäuses und
Fig. 7 und 8
Schnittansichten einer zweiten Ausführungsform der erfindungsgemäßen Vakuumpumpe.
In the following, the present invention is explained purely by way of example using advantageous embodiments with reference to the accompanying drawings. Show it:
Fig. 1
2 shows a perspective view of a first embodiment of the vacuum pump according to the invention,
Fig. 2
a front view of the in Fig. 1 shown embodiment,
Fig. 3
a sectional view of the in Fig. 1 shown embodiment,
Fig. 4
another sectional view of the in Fig. 1 shown embodiment,
5 and 6
different perspective views of the first embodiment of the vacuum pump when the housing section is inserted into the base body of the housing and
7 and 8
Sectional views of a second embodiment of the vacuum pump according to the invention.

Fig. 1 zeigt eine ölüberlagerte Drehschieberpumpe 10 mit einem Motor 12, an den sich ein Ständerbereich 14 mit einem Einlassflansch 16 anschließt. Der Einlassflansch 16 wird mit der zu evakuierenden Vorrichtung verbunden, um in dieser durch den Betrieb der Pumpe 10 ein Vakuum zu erzeugen. Fig. 1 shows an oil-covered rotary vane pump 10 with a motor 12, to which a stator region 14 with an inlet flange 16 connects. The inlet flange 16 is connected to the device to be evacuated in order to create a vacuum in it by the operation of the pump 10.

Die die Pumpwirkung erzeugenden Funktionskomponenten der Pumpe 10 sind in einem mit dem Ständerbereich 14 verbundenen Gehäuse 18 angeordnet. Das Gehäuse 18 wird auch als Kappe bezeichnet. Das Gehäuse 18 umfasst einen Grundkörper 20 und einen an der - in Gebrauchslage der Pumpe 10 - oberen Seite des Gehäuses 18 angeordneten Gehäuseabschnitt 22, der in einen mit einer Führung versehenen Abschnitt des Grundkörpers 20 eingeschoben ist, was nachfolgend noch detailliert beschrieben ist. Der Gehäuseabschnitt 22 wird in seiner Position durch einen rastbaren Drehriegel 24 gesichert.The functional components of the pump 10 that produce the pumping action are arranged in a housing 18 connected to the stator region 14. The housing 18 is also referred to as a cap. The housing 18 comprises a base body 20 and a housing section 22 which is arranged on the upper side of the housing 18 in the position of use of the pump 10 and which is inserted into a section of the base body 20 provided with a guide, which will be described in detail below. The housing section 22 is secured in its position by a latchable rotary latch 24.

Der Gehäuseabschnitt 22 ist an seiner Oberseite mit einem Ausstoßflansch 26 versehen, durch den das aus der zu evakuierenden Vorrichtung angesaugte Gas ausgestoßen wird.The housing section 22 is provided on its upper side with an ejection flange 26 through which the gas drawn in from the device to be evacuated is ejected.

Fig. 2 zeigt die Pumpe 10 in einer Frontansicht. Außerdem ist die Lage einer Schnittebene AA angedeutet. Die entsprechende Schnittansicht ist in Fig. 3 gezeigt. Fig. 2 shows the pump 10 in a front view. The position of a section plane AA is also indicated. The corresponding sectional view is in Fig. 3 shown.

Die Querschnittsdarstellung der Fig. 3 ermöglicht die Sicht auf ein Pumpsystem 28, das - angetrieben durch den Motor 12 - die Pumpleistung der Pumpe 10 erzeugt. Eingezeichnet ist auch ein Ölpegel O (punktstrichliniert dargestellt), der in etwa bei Betrieb der Pumpe 10 vorliegt. Es versteht sich, dass der Ölstand O auch höher oder etwas niedriger liegen kann. Die Position eines Ausstoßventils des Pumpsystems 28 liegt jedoch unterhalb des Ölpegels O. Es handelt sich bei der Pumpe 10 somit um eine ölüberlagerte Drehschieberpumpe, bei der nicht nur Öl in die Pumpenkammer eingespritzt wird, sondern bei der wesentliche Komponenten des Pumpsystems 28 zumindest teilweise in dem Schmiermittel angeordnet sind. Ölüberlagerte Drehschieberpumpen sind vergleichsweise verschleißarm, zuverlässig und leistungsfähig. Konstruktionsbedingt werden bei dem Betrieb der Pumpe 10 jedoch nicht unerhebliche Mengen von Öltröpfchen erzeugt, die von dem auszustoßenden Gasstrom mitgerissen werden, so dass ein Tröpfchen-Gas-Gemisch entsteht (Aerosol). Außerdem können betriebsbedingt Öltropfen im Inneren des Gehäuses 18 umherspritzen, beispielsweise aufgrund von Gasströmungen in der Pumpe 10.The cross-sectional representation of the Fig. 3 enables a view of a pump system 28, which - driven by the motor 12 - generates the pump power of the pump 10. An oil level O (shown in dashed lines) is also shown, which is approximately present when the pump 10 is in operation. It goes without saying that the oil level O can also be higher or slightly lower. However, the position of an exhaust valve of the pump system 28 is below the oil level O. The pump 10 is thus an oil-covered rotary vane pump, in which not only oil is injected into the pump chamber, but at least partially in the essential components of the pump system 28 Lubricants are arranged. Oil-covered rotary vane pumps are comparatively low-wear, reliable and powerful. Due to the design, the operation of the pump 10 produces not inconsiderable amounts of oil droplets, which are entrained by the gas stream to be expelled, so that a droplet-gas mixture is formed (aerosol). In addition, oil drops may splash around inside the housing 18 due to operation, for example due to gas flows in the pump 10.

Um die Öltröpfchen aus dem Gasstrom abzuscheiden, ist in dem Gehäuseabschnitt 22 ein ebenes oder flächiges Filterelement 30 integriert. Zu diesem Zweck weist der Gehäuseabschnitt 22 eine Vertiefung 32 auf, in der das Filterelement 30 angeordnet ist. Das Filterelement 30 liegt auf einer Stufe 34 in der Vertiefung 32 auf.In order to separate the oil droplets from the gas stream, a flat or flat filter element 30 is integrated in the housing section 22. For this purpose, the housing section 22 has a recess 32 in which the filter element 30 is arranged. The filter element 30 lies on a step 34 in the recess 32.

Bei einem Betrieb der Pumpe 10 strömen die Öltröpfchen zusammen mit dem Gas durch eine Auslassöffnung 36 des Gehäusegrundkörpers 20. Die Auslassöffnung 36 ist durch den Gehäuseabschnitt 22 verschlossen, so dass das Aerosol durch das Filterelement 30 strömen muss, wobei die Tröpfchen aus dem Gasstrom abgeschieden werden und ggf. wieder nach unten tropfen. Zur Erreichung höchstmöglicher Abscheideeffizienz ist das Filterelement 30 größer als die Auslassöffnung 36; d.h. die der gesamte Gasstrom muss das Filterelement 30 passieren. Die Auslassöffnung 36 weist einen deutlich größeren Querschnitt auf als der Ausstoßflansch 26 (nicht geschnitten dargestellt), um das Tröpfchen-Gas-Gemisch durch ein flächenmäßig größeres Filterelement 30 zu leiten, das dementsprechend dünner ausgeführt werden kann.When the pump 10 is operating, the oil droplets flow together with the gas through an outlet opening 36 of the housing base body 20. The outlet opening 36 is closed by the housing section 22, so that the aerosol must flow through the filter element 30, the droplets being separated from the gas stream and drip down again if necessary. To achieve the highest possible separation efficiency, the filter element 30 is larger than the outlet opening 36; ie the entire gas flow must pass through the filter element 30. The Outlet opening 36 has a significantly larger cross section than the ejection flange 26 (not shown in section) in order to guide the droplet-gas mixture through a filter element 30 with a larger surface area, which can accordingly be made thinner.

Nachdem das Gas durch das flache, quaderförmige Filterelement 30 getreten ist, gelangt es in eine durch die Stufe 34 gebildete Kammer 38 der Vertiefung 32, die mit dem Ausstoßflansch 26 in Verbindung steht. D.h. ein Bodenabschnitt der Vertiefung 32 weist eine Öffnung auf, die in den Flansch 26 übergeht. Bei einer entsprechenden Geometrie des Gehäuseabschnitts 22 kann auch ein seitlicher Abgang des Flanschs 26 vorgesehen sein.After the gas has passed through the flat, cuboid-shaped filter element 30, it passes into a chamber 38 of the depression 32 formed by the step 34, which is in communication with the discharge flange 26. I.e. a bottom portion of the recess 32 has an opening that merges into the flange 26. With a corresponding geometry of the housing section 22, a lateral outlet of the flange 26 can also be provided.

Zur Abstützung des Filterelements 30 überspannen die Auslassöffnung 36 Stege 40. Grundsätzlich können auch das Filterelement 30 abstützende Elemente an dem Gehäuseabschnitt 22 vorgesehen sein, beispielsweise Stege, die die Kammer 38 überspannen.To support the filter element 30, the outlet opening 36 spans webs 40. In principle, elements supporting the filter element 30 can also be provided on the housing section 22, for example webs that span the chamber 38.

Zur Stabilisierung kann das Filterelement 30 selbst mit verstärkenden Komponenten versehen sein, etwa mit einem Rahmen. Das Filterelement 30 ist derart ausgestaltet, dass es auf einfache Weise austauschbar ist. Beispielsweise ist es eine Art "Kartusche", die als Verbrauchsmaterial am Einsatzort vorgehalten wird.For stabilization, the filter element 30 itself can be provided with reinforcing components, for example with a frame. The filter element 30 is designed in such a way that it can be exchanged in a simple manner. For example, it is a kind of "cartridge" that is held as a consumable at the place of use.

Der Gehäuseabschnitt 22 wird durch den bereits erwähnten Drehriegel 24 in seiner Position gehalten. Durch einen die Auslassöffnung 36 umgebenden Dichtring 42 wird eine zuverlässige Abdichtung zwischen dem Grundkörper 20 und dem Gehäuseabschnitt 22 hergestellt.The housing section 22 is held in its position by the rotary latch 24 already mentioned. A reliable seal between the base body 20 and the housing section 22 is produced by a sealing ring 42 surrounding the outlet opening 36.

Fig. 4 zeigt die Drehschieberpumpe 10 in einer zu der Schnittebene AA senkrechten Schnittebene, um den Aufbau des Gehäuseabschnitts 22 mit integriertem Filterelement 30 weiter zu verdeutlichen. Der Flansch 26 ist - wie in Fig. 3 - nicht geschnitten dargestellt. Der Fig. 4 ist besonders gut zu entnehmen, dass das Filterelement 30 bündig mit einer dem Grundkörper 20 zugewandten Anlagefläche 44 des Gehäuseabschnitts 22 abschließt. Fig. 4 shows the rotary vane pump 10 in a section plane perpendicular to the section plane AA in order to further clarify the structure of the housing section 22 with an integrated filter element 30. The flange 26 is - as in Fig. 3 - Not shown cut. Of the Fig. 4 it can be seen particularly well that the filter element 30 is flush with a contact surface 44 of the housing section 22 facing the base body 20.

Fig. 5 und 6 zeigen, wie der Gehäuseabschnitt 22 in den Grundkörper 20 eingeschoben wird. Wie auch in den Fig. 1, 2 und 4 ist zu erkennen ist, weist der Gehäuseabschnitt 22 einen im Wesentlichen trapezförmigen Querschnitt auf. Die Basis des Gehäuseabschnitts 22 greift in komplementär ausgestaltete Hinterschnitte 46 des Grundkörpers 20 ein, so dass eine Schwalbenschwanzführung realisiert wird, die eine zuverlässige Verbindung der Komponenten 22, 20 sicherstellt. Die Einschubbewegung des Gehäuseabschnitts 22 wird in Fig. 5 und 6 durch den Pfeil E angegeben. In Fig. 5 sind auch einer der bereits anhand der Fig. 3 beschriebenen Stege 40 sowie der Dichtring 42 zu erkennen. Die Ansicht in Fig. 6 zeigt, wie das Filterelement 30 bündig abschließend in den Gehäuseabschnitt 22 eingesetzt ist. 5 and 6 show how the housing section 22 is inserted into the base body 20. As in the 1, 2 and 4th can be seen, the housing section 22 has a substantially trapezoidal cross section. The base of the housing section 22 engages in complementarily configured undercuts 46 of the base body 20, so that a dovetail guide is implemented which ensures a reliable connection of the components 22, 20. The insertion movement of the housing section 22 is shown in 5 and 6 indicated by the arrow E. In Fig. 5 are also one of the already based on the Fig. 3 webs 40 and the sealing ring 42 described. The view in Fig. 6 shows how the filter element 30 is inserted flush into the housing section 22.

Die Fig. 7 und 8 zeigen Schnittansichten einer zweiten Ausführungsform 10' der Drehschieberpumpe. Die Schnittebenen entsprechen denen der in den Fig. 3 bzw. 4 gezeigten Schnittansichten. Die Drehschieberpumpe 10' gleicht grundsätzlich der Drehschieberpumpe 10. Zusätzlich ist jedoch ein Ölauffangblech 48 vorgesehen, das im Inneren des Gehäuses 18 angeordnet ist. Es liegt beabstandet von der Auslassöffnung 36 zwischen der Öffnung 36 und dem Pumpsystem 28 und überdeckt die Öffnung 36. Wie in Fig. 8 zu erkennen ist, muss das auszustoßende Gas samt den darin enthaltenen Tröpfchen - also das Aerosol - um das Ölauffangblech 48 herum strömen, um zu der Auslassöffnung 36 zu gelangen. Dadurch wird verhindert, dass das Filterelement 30 durch herumspritzendes Öl direkt getroffen wird und somit dessen Ölabscheidefähigkeit herabgesetzt wird. Neben der vorstehend beschriebenen Schutzwirkung dient das Ölauffangblech 48 auch dazu, herabtropfendes Öl, das durch die Filterwirkung des Elements 30 aus dem Gasstrom abgeschieden wurde, aufzufangen und abzuführen. Zu diesem Zweck ist das Ölauffangblech 48 nach rechts hin geneigt und weist die Form eines flachen V auf. Alternative Ausgestaltungen des Ölauffangblechs 48 sind ebenfalls denkbar. Zum Schutz des Filterelements 30 kann - zusätzlich oder alternativ - auch ein labyrinth-artiger Strömungspfad für das auszustoßende Gas vorgesehen sein, um ein direktes Anspritzen des Filterelements 30 zu verhindern.The 7 and 8 show sectional views of a second embodiment 10 'of the rotary vane pump. The cutting planes correspond to those in the Fig. 3 or 4 sectional views shown. The rotary vane pump 10 'is basically the same as the rotary vane pump 10. In addition, however, an oil collecting plate 48 is provided, which is arranged in the interior of the housing 18. It is spaced from the outlet opening 36 between the opening 36 and the pumping system 28 and covers the opening 36. As in FIG Fig. 8 It can be seen that the gas to be ejected, together with the droplets contained therein - that is to say the aerosol - must flow around the oil collecting plate 48 in order to reach the outlet opening 36. This prevents the filter element 30 from being hit directly by oil splashing around and thus reducing its oil separation ability. In addition to the protective effect described above, the oil collecting plate 48 also serves to collect and discharge dripping oil which has been separated from the gas stream by the filtering effect of the element 30. To this end the oil collecting plate 48 is inclined to the right and has the shape of a flat V. Alternative configurations of the oil collecting plate 48 are also conceivable. To protect the filter element 30, a labyrinth-like flow path for the gas to be expelled can also be provided, in addition or as an alternative, in order to prevent the filter element 30 from being sprayed on directly.

Das Ölauffangblech 48 ist an einer Seitenwand des Gehäusegrundkörpers 20 befestigt, wie insbesondere in Fig. 8 zu erkennen ist. Es kann vorgesehen sein, das von dem Filterelement 30 herabtropfende Öl nicht wieder direkt in den Ölsumpf zurückzuführen, sondern es abzuführen und anschließend zu entsorgen oder der Pumpe 10' nach einer Reinigung wieder zuzuführen. Dies kann bei Anwendungen vorteilhaft sein, bei denen mit einer Kontamination des Öls zu rechnen ist. Zu diesem Zweck kann eine nicht gezeigte Ablassbohrung vorgesehen sein. Außerdem kann ein Schauglas vorgesehen sein, um den Zustand und die Menge des durch das Ölauffangblech aufgefangenen Öls zu bestimmen und dieses bei Bedarf durch die genannte Bohrung abzulassen.The oil collecting plate 48 is fastened to a side wall of the housing base body 20, as in particular in FIG Fig. 8 can be seen. It can be provided that the oil dripping from the filter element 30 is not returned directly into the oil sump, but instead is discharged and subsequently disposed of or returned to the pump 10 'after cleaning. This can be advantageous in applications in which contamination of the oil can be expected. A drain hole, not shown, can be provided for this purpose. In addition, a sight glass can be provided in order to determine the state and the amount of the oil collected by the oil collecting plate and to drain this through the mentioned bore if necessary.

Die erfindungsgemäße Vakuumpumpe mit in einen Abschnitt des Gehäuses integriertem Filterelement zur Ölnebelabscheidung zeichnet sich durch eine kompakte Bauweise aus. Außerdem ergeben sich Vorteile hinsichtlich der Funktionssicherheit, da die Ölnebelabscheidung automatisch in die Pumpe integriert ist. Das Filterelement lässt sich auf einfache Weise austauschen, was zur Senkung der Wartungskosten beiträgt. Die konstruktiv einfache und elegante Lösung der der Erfindung zugrunde liegende Aufgabe führt zudem zur Senkung der Herstellungskosten verglichen mit Systemen herkömmlicher Bauart.The vacuum pump according to the invention with a filter element for oil mist separation integrated in a section of the housing is distinguished by a compact design. There are also advantages in terms of functional reliability, since the oil mist separation is automatically integrated into the pump. The filter element can be easily replaced, which helps to reduce maintenance costs. The structurally simple and elegant solution to the problem underlying the invention also leads to a reduction in manufacturing costs compared to systems of conventional design.

BezugszeichenlisteReference list

10, 10'10, 10 '
DrehschieberpumpeRotary vane pump
1212th
Motorengine
1414
StänderbereichStand area
1616
EinlassflanschInlet flange
1818th
Gehäusecasing
2020th
GrundkörperBasic body
2222
GehäuseabschnittHousing section
2424th
DrehriegelRotary latch
2626
AusstoßflanschDischarge flange
2828
PumpsystemPump system
3030th
FilterelementFilter element
3232
Vertiefungdeepening
3434
Stufestep
3636
AuslassöffnungOutlet opening
3838
Kammerchamber
4040
Stegweb
4242
DichtringSealing ring
4444
AnlageflächeContact surface
4646
HinterschnittUndercut
4848
ÖlauffangblechOil catcher
AAAA
SchnittebeneCutting plane
OO
ÖlpegelOil level
EE
EinschubbewegungInsertion movement

Claims (13)

  1. A vacuum pump comprising a rotary vane pump system (28) that has oil superposed on it; and a housing (18) which surrounds the pump system (28) and which has an expulsion flange (26) for expelling a fluid sucked in by the vacuum pump, wherein a filter element (30) for filtering the fluid to be expelled is arranged upstream of the expulsion flange (26); and wherein the filter element (30) is integrated in a housing section (22) coupled to a base body (20) of the housing (18),
    characterized in that
    the housing section (22) is releasably coupled to the base body (20); in that the housing section (22) covers an outlet opening (36) of the base body (20) in a state coupled to the base body (20); in that the filter element (30) integrated in the housing section (22) substantially completely covers the outlet opening (36); and in that the base body (20) has a guide into which the housing section (22) can be inserted for coupling to the base body (20), in particular with the guide having at least one undercut (46) which cooperates with a guide section of the housing section (22) having a complementary design.
  2. A vacuum pump in accordance with claim 1,
    characterized in that
    the expulsion flange (26) is arranged at the housing section (22).
  3. A vacuum pump in accordance with claim 1 or claim 2,
    characterized in that
    the filter element (30) is replaceably inserted into the housing section (22).
  4. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the filter element (30) has a reinforcing structure, in particular a frame.
  5. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the filter element (30) is substantially planar.
  6. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the housing section has a recess (32) which is connected to the expulsion flange (26), with the filter element (30) being arranged at least partly, in particular completely, in the recess (32), in particular with the recess (32) having a step (34) which is provided for contacting the filter element (30).
  7. A vacuum pump in accordance with claim 6,
    characterized in that
    the filter element (30) ends substantially in alignment with a side of the housing section (22) facing the base body (20) in a state inserted into the recess (32).
  8. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the outlet opening (36) and/or the recess (32) is/are spanned by at least one web (40).
  9. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the filter element (30) has a surface which is at least twice, in particular at least three times, as large as the cross-section of the expulsion flange (26).
  10. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    a protective device (48) is provided in the interior of the housing (18) and is designed and arranged such that a direct splashing of the filter element (30) by a lubricant present in the vacuum pump is avoided, in particular with the protective device (48) having a channel-like basic shape, and in particular with the basic shape at least sectionally having the shape of a flat V in a cross-section.
  11. A vacuum pump in accordance with claim 10,
    characterized in that
    the protective device (48) covers the outlet opening.
  12. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the housing section (22) substantially has the shape of a trapezoid in a cross-section perpendicular to its longitudinal extent.
  13. A vacuum pump in accordance with at least one of the preceding claims,
    characterized in that
    the housing section (22) forms - in the position of use of the vacuum pump - a part of the upper side of the housing (18).
EP15153082.1A 2015-01-29 2015-01-29 Vacuum pump Active EP3051136B1 (en)

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Publication number Priority date Publication date Assignee Title
CN112302940B (en) * 2020-09-30 2022-10-21 宁波爱发科真空技术有限公司 Novel two-stage rotary vane vacuum pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009054502A1 (en) * 2008-12-19 2010-06-24 Continental Teves Ag & Co. Ohg Motor-pump unit
EP2733353A1 (en) * 2011-06-03 2014-05-21 Aisin Seiki Kabushiki Kaisha Fluid pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501852A1 (en) * 1984-02-02 1985-08-14 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Vane vacuum pump
JP3987697B2 (en) * 2000-12-22 2007-10-10 カルソニックコンプレッサー株式会社 Gas compressor
DE20103261U1 (en) * 2001-02-23 2001-06-07 Rietschle Werner Gmbh & Co Kg Oil separator for oil-flooded pumps
JP4230785B2 (en) * 2002-01-25 2009-02-25 カルソニックコンプレッサー株式会社 Gas compressor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009054502A1 (en) * 2008-12-19 2010-06-24 Continental Teves Ag & Co. Ohg Motor-pump unit
EP2733353A1 (en) * 2011-06-03 2014-05-21 Aisin Seiki Kabushiki Kaisha Fluid pump

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