EP2652332B1 - Vacuum pump - Google Patents

Vacuum pump Download PDF

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Publication number
EP2652332B1
EP2652332B1 EP11799390.7A EP11799390A EP2652332B1 EP 2652332 B1 EP2652332 B1 EP 2652332B1 EP 11799390 A EP11799390 A EP 11799390A EP 2652332 B1 EP2652332 B1 EP 2652332B1
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EP
European Patent Office
Prior art keywords
displacement body
displacement
vacuum pump
shaft
bore
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.)
Active
Application number
EP11799390.7A
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German (de)
French (fr)
Other versions
EP2652332A2 (en
Inventor
Rudolf Bahnen
Uwe Drewes
Klaus Rofall
Markus LÖBEL
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.)
Gebr Becker GmbH
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Gebr Becker GmbH
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Publication of EP2652332A2 publication Critical patent/EP2652332A2/en
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Publication of EP2652332B1 publication Critical patent/EP2652332B1/en
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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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/04—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents of internal-axis type
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C28/26—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • 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
    • 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
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors

Definitions

  • the invention relates to a vacuum pump according to the features of the preamble of claim 1.
  • Vacuum pumps as such are already known. It is possible to differentiate between vacuum pumps with direct positive displacement cooling and, to that extent, not directly cooled vacuum pumps.
  • the state of the art of a direct positive displacement cooling having vacuum pumps is particularly to the EP 1 242 742 B1 or the US 2005/0069446 A1 to refer. It is also on the DE 10 2010 060 199 A1 to refer.
  • a vacuum pump in which a tubular body is mounted in a displacement body and thus also in a working space of a housing of the vacuum pump.
  • the invention has the object to provide a structurally simple, compact and effective in particular with regard to the cooling performance of such a vacuum pump.
  • a fastening region of the tubular body is located in a region of a displacement body shaft, which in turn is located within a motor / gear compartment of the housing.
  • a free space extends from the cover part to the mounting area of the body in the displacer shaft.
  • the recess is cylindrical.
  • the cooling liquid emerges in the region of an end face of the cover part facing the interior of the free space. Further preferred it only exits there from the tubular body.
  • the coolant exits at the suction end of the displacer and can then flow back from there, preferably in the engine / gear compartment. At the suction end of the displacement body prevail the lowest temperatures. The coolant thus exits at the cool end of the displacer and can then dissipate heat from the displacer in a countercurrent principle with respect to the temperature profile.
  • the tubular body is received in a corresponding receiving recess of the displacement body shaft.
  • the receiving recess preferably has a fastening section and an enforcement section formed with a larger cross-section.
  • the penetration portion is further preferably formed displacement body side of the attachment portion.
  • the cooling liquid is injectable in the body-side attachment portion that is open in an axial direction of the attachment portion.
  • the body may be formed in particular as a conventional tubular body with a same wall thickness over its entire length. Together with, as stated, preferably cylindrical recess in the displacer, which passes freely through the tubular body at least over a substantial part of its length associated with the displacer, results in this freely interspersed area a comparatively large annular cavity, which are used for the cooling liquid can.
  • radial bores are preferably formed in the penetration section of the displacement body shaft, in a region of the displacement body shaft which is the engine / Gear compartment is assigned.
  • the oil or the high-temperature coolant can flow back into the engine / gear chamber.
  • the circulation of the cooling liquid is determined practically solely by the injection of the cooling liquid into the tubular body.
  • the displacement body shaft can also be mounted on the suction side by means of the displacement body. This further preferably by means of the cover part.
  • the tubular body can be designed practically alone on the passage of the cooling liquid in terms of its structural design.
  • the tubular body may also consist of a different material than the displacement body or the displacement body shaft, for which a steel material is preferred. For example, from a light metal such as aluminum.
  • the displacement bodies can also be made of a different material than the displacement body shafts, for example also of aluminum.
  • FIG. 1 Shown and described is an in FIG. 1 illustrated in cross-section vacuum pump 1, which is formed in the embodiment as a screw pump.
  • the vacuum pump 1 has a first displacement body shaft 2 and a second displacement body shaft 3.
  • a displacement body shaft 2, 3 has a geometrical (longitudinal) axis A.
  • it is a dry-running pump.
  • the vacuum pump 1 further has a pump housing, which is divided into a housing part 4 relating to a working space 5 and a housing part 6, which forms a motor / gear chamber 7.
  • the housing parts 4, 6 are, in particular with regard to the housing part 6, to housing parts which are closed radially and in relation to the positive-displacement body shafts 2, 3, and are preferably integrally formed in this respect. For example, it may be cast (steel or aluminum) castings.
  • the housing part 6 is closed at the back by a closure plate 8 in which the displacement body shafts 2, 3 are mounted at the end.
  • an oil pump 9 which is also driven by the displacer body shaft 2, is arranged on the outside of the closure part 8.
  • the oil pump 9 provides for the oil supply in the engine / transmission chamber 7 and also, as realized by the oil, for the cooling liquid and its transport or circulation, as described in detail below.
  • a partition wall 10 is formed between the engine / gear chamber 7 and the working space 5.
  • the displacement body shafts 2, 3 are mounted by means of bearings 11.
  • the displacement body shafts 2, 3 are provided with displacers 12,13. These act helically in the usual manner in the embodiment, but without touching.
  • the displacement body 12,13 can basically be made in one piece with the respective displacement body shaft 2, 3. In the embodiment and preferred, however, they are designed separately and with the VerdrängerEffwellen example form gleich- and / or screw-connected.
  • the displacement bodies 12, 13 each formed with a cylindrical recess 14 are mounted in the housing 4 via a bearing 16 by means of a cover part 15 covering the recess 14.
  • the lid part 15 is directly attached to a displacement body 12, 13 and rotates with this.
  • the lid part 15 can be sealed in a simple manner by means of an O-ring 29 with respect to the displacement body shaft or the respective displacement body.
  • the displacement body shafts 2, 3 are also driven in the embodiment of a single, cooperating with the displacement body shaft 3 motor 17 and coupled to each other via a gear 18.
  • the recess 14 formed in the displacement body 12 or 13 extends, starting at a suction-side end 19 of a displacement body 12 or 13, over a considerable part of the length of the displacement body 12 or 13, concentric with a longitudinal axis A of a displacement body shaft 2, 3 or of the displacement body 12.13.
  • a tubular body 20 Within the recess 14 extends, also concentric with the axis A, a tubular body 20.
  • the tubular body 20 is fixed on the one hand in the cover part 15 and on the other hand in the displacement body shaft 2. It rotates correspondingly together with the displacement body shaft 2 or 3 or the displacement body 12.
  • the tubular body 20 see in particular also FIG. 2 , Is used for the passage of cooling liquid, which is given in the embodiment by the means of the oil pump 9 in the engine / gear chamber 7 pumped or circulated in oil fluid, to the suction end of a displacement body 12,13.
  • the tubular body 20 in the region of the cover part 15 on outlet openings 21 for the cooling liquid.
  • the exit of the cooling liquid directly on the cover part 15 is also favorable with regard to a cooling of the bearing 16.
  • the cooling liquid is injected in detail, which is not shown separately, in the displacement body shaft 2, 3, in a motor / Gear box 7 associated area before, as seen in the direction of a displacer 12, 13, the tubular body 20 begins.
  • the recess 14 initially has, seen from the suction end of a displacement body 12 and 13, a larger diameter D and then a smaller diameter d.
  • the larger diameter D preferably corresponds to 3 to 7 times an outer diameter R of the tubular body 20.
  • the smaller diameter d preferably corresponds to 1.2 to 2 times the outer diameter R of the tubular body 20.
  • the region of the larger diameter D of the recess 14 in the displacer 12 or 13 extends over a length 1, seen from the lid member 15, which preferably one half to 4/5 of the total length L of the displacement body 12 and 13 corresponds.
  • the tubular body 20 further extends freely projecting a bore 22 of the displacement body shaft 2 and 3.
  • This bore 22 is preferably formed with an equal diameter and aligned with the diameter d having bore 23 of the displacer 12 and 13 respectively.
  • the bore 22 of the displacement body shaft 2 or 3 then passes into a contrast smaller diameter bore 24 of the displacement body shaft 2 and 3, in which the tubular body 20 is further arranged freely passing through.
  • the holes 22, 24 summarize an enforcement section of the displacement body shaft 2, 3 represents.
  • a support hole 25 is again smaller diameter formed in the VerdrängerMechwelle 2 and 3, respectively, to form a mounting portion in which a related end 26 of the tubular Body 20 is held.
  • the end 26 is an externally reduced area with regard to the wall thickness of the tubular body 20, so that a contact shoulder 27 results on the tubular body 20 and rests against a corresponding bearing shoulder 28 of the displacement body shaft 2, 3. Due to the abutment of the abutment shoulder 27 on the bearing shoulder 28 on the one hand and the other end given system of the tubular body 20 in the cover part 15, the axial position of the tubular body 20 is fixed in the composite of displacement body shaft and displacer.
  • the holder of the end 26 in the displacement body shaft 2, 3 can be achieved, for example by means of a spring element, corresponding to a groove / spring connection known for waves, by radially fixed clamping.
  • the displacement body 12, 13 has, viewed in detail following the recess 14 from the cover 15, a fitting bore section 30, in which a connecting section 31 of the displacement body shaft 2, 3 is seated. On an end face 32 of the connecting portion 31 sits a disk body 33 which is penetrated by fastening screws 34.
  • the disk body 33 has associated with the bore 23, for the transition into this, a corresponding bore with an inflow-side rounded 35 on.

Description

Die Erfindung betrifft eine Vakuumpumpe nach den Merkmalen des Oberbegriffes des Anspruchs 1.The invention relates to a vacuum pump according to the features of the preamble of claim 1.

Vakuumpumpen als solche sind bereits bekannt. Man kann zwischen Vakuumpumpen mit einer unmittelbaren Verdrängerkörperkühlung und insoweit nicht unmittelbar gekühlten Vakuumpumpen unterscheiden. Zum Stand der Technik der eine direkte Verdrängerkörperkühlung aufweisenden Vakuumpumpen ist insbesondere auf die EP 1 242 742 B1 beziehungsweise die US 2005/0069446 A1 zu verweisen. Es ist auch auf die DE 10 2010 060 199 A1 zu verweisen.Vacuum pumps as such are already known. It is possible to differentiate between vacuum pumps with direct positive displacement cooling and, to that extent, not directly cooled vacuum pumps. The state of the art of a direct positive displacement cooling having vacuum pumps is particularly to the EP 1 242 742 B1 or the US 2005/0069446 A1 to refer. It is also on the DE 10 2010 060 199 A1 to refer.

Aus der WO02/12726 A1 ist eine Vakuumpumpe bekannt, bei welcher ein rohrförmiger Körper in einem Verdrängerkörper und damit auch in einem Arbeitsraum eines Gehäuses der Vakuumpumpe befestigt ist.From the WO02 / 12726 A1 a vacuum pump is known in which a tubular body is mounted in a displacement body and thus also in a working space of a housing of the vacuum pump.

Ausgehend von dem zuletzt dargelegten Stand der Technik beschäftigt sich die Erfindung mit der Aufgabe, eine konstruktiv einfache, kompakte und insbesondere hinsichtlich der Kühlleistung wirksame Ausgestaltung einer derartigen Vakuumpumpe anzugeben.Based on the last-mentioned prior art, the invention has the object to provide a structurally simple, compact and effective in particular with regard to the cooling performance of such a vacuum pump.

Diese Aufgabe ist beim Gegenstand des Anspruches 1 gelöst, wobei darauf abgestellt ist, dass ein Befestigungsbereich des rohrförmigen Körpers sich in einem Bereich einer Verdrängerkörperwelle befindet, welcher sich seinerseits innerhalb eines Motor-/Getrieberaums des Gehäuses befindet. Bevorzugt erstreckt sich ein Freiraum einbautenfrei von dem Deckelteil bis zu dem Befestigungsbereich des Körpers in der Verdrängerkörperwelle. Der praktisch über die gesamte Länge des Durchsetzungsbereiches einbautenfrei ausgebildete Freiraum erbringt eine einfache und wirksame Gestaltung des Raumes, in den aus dem rohrförmigen Körper austretende Flüssigkeit strömen kann. Auch ergibt sich eine montagemäßig günstige Gestaltung.This object is achieved in the subject matter of claim 1, wherein it is pointed out that a fastening region of the tubular body is located in a region of a displacement body shaft, which in turn is located within a motor / gear compartment of the housing. Preferably, a free space extends from the cover part to the mounting area of the body in the displacer shaft. The practical Free space formed over the entire length of the enforcement area provides a simple and effective design of the space into which liquid emerging from the tubular body can flow. Also results in a montagemäßig favorable design.

Es ist weiter bevorzugt, dass die Ausnehmung zylindrisch ist.It is further preferred that the recess is cylindrical.

Bevorzugt ist auch, dass die Kühlflüssigkeit im Bereich einer dem Inneren des Freiraums zugewandten Stirnfläche des Deckelteils austritt. Weiter bevorzugt tritt sie nur dort aus dem rohrförmigen Körper aus. Damit tritt die Kühlflüssigkeit am saugseitigen Ende des Verdrängerkörpers aus und kann dann von dort aus zurückströmen, bevorzugt in den Motor-/Getrieberaum. Am saugseitigen Ende des Verdrängerkörpers herrschen die niedrigsten Temperaturen. Die Kühlflüssigkeit tritt also am kühlen Ende des Verdrängerkörpers aus und kann dann im Gegenstromprinzip im Hinblick auf den Temperaturverlauf Wärme von dem Verdrängerkörper abführen.It is also preferable that the cooling liquid emerges in the region of an end face of the cover part facing the interior of the free space. Further preferred it only exits there from the tubular body. Thus, the coolant exits at the suction end of the displacer and can then flow back from there, preferably in the engine / gear compartment. At the suction end of the displacement body prevail the lowest temperatures. The coolant thus exits at the cool end of the displacer and can then dissipate heat from the displacer in a countercurrent principle with respect to the temperature profile.

Der rohrförmige Körper ist in einer entsprechenden Aufnahmeausnehmung der Verdrängerkörperwelle aufgenommen. Hierbei weist bevorzugt die Aufnahmeausnehmung einen Befestigungsabschnitt und einen mit einem größeren Querschnitt ausgebildeten Durchsetzungsabschnitt auf. Der Durchsetzungsabschnitt ist weiter bevorzugt verdrängerkörperseitig des Befestigungsabschnittes ausgebildet.The tubular body is received in a corresponding receiving recess of the displacement body shaft. In this case, the receiving recess preferably has a fastening section and an enforcement section formed with a larger cross-section. The penetration portion is further preferably formed displacement body side of the attachment portion.

Weiter bevorzugt ist die Kühlflüssigkeit in dem Befestigungsabschnitt zum Eintritt in den Körper, der in eine Axialrichtung des Befestigungsabschnittes offen ist, einspritzbar. Der Körper kann insbesondere als üblicher Rohrkörper mit einer gleichen Wandungsdicke über seine gesamte Länge ausgebildet sein. Zusammen mit der, wie ausgeführt, bevorzugt zylindrischen Ausnehmung in dem Verdrängerkörper, welche der rohrförmige Körper zumindest über einen wesentlichen Teil seiner dem Verdrängerkörper zugeordneten Länge frei durchsetzt, ergibt sich in diesem frei durchsetzten Bereich ein vergleichsweise großer kreisringförmiger Hohlraum, der für die Kühlflüssigkeit benutzt werden kann.More preferably, the cooling liquid is injectable in the body-side attachment portion that is open in an axial direction of the attachment portion. The body may be formed in particular as a conventional tubular body with a same wall thickness over its entire length. Together with, as stated, preferably cylindrical recess in the displacer, which passes freely through the tubular body at least over a substantial part of its length associated with the displacer, results in this freely interspersed area a comparatively large annular cavity, which are used for the cooling liquid can.

Zur Rückführung der Kühlflüssigkeit, die bevorzugt Öl ist, sind bevorzugt in dem Durchsetzungsabschnitt der Verdrängerkörperwelle Radialbohrungen ausgebildet, in einem Bereich der Verdrängerkörperwelle, der dem Motor-/ Getrieberaum zugeordnet ist. Hierüber kann das Öl beziehungsweise die hohe Temperatur aufweisende Kühlflüssigkeit in den Motor-/Getrieberaum zurückströmen. Der Kreislauf der Kühlflüssigkeit wird praktisch allein durch das Einspritzen der Kühlflüssigkeit in den rohrförmigen Körper bestimmt.For the return of the cooling liquid, which is preferably oil, radial bores are preferably formed in the penetration section of the displacement body shaft, in a region of the displacement body shaft which is the engine / Gear compartment is assigned. By way of this, the oil or the high-temperature coolant can flow back into the engine / gear chamber. The circulation of the cooling liquid is determined practically solely by the injection of the cooling liquid into the tubular body.

Die Verdrängerkörperwelle kann vermittels des Verdrängerkörpers auch saugseitig gelagert sein. Dies weiter bevorzugt vermittels des Deckelteils. Der rohrförmige Körper kann hinsichtlich seiner konstruktiven Auslegung praktisch allein auf die Durchleitung der Kühlflüssigkeit konzipiert sein. Insbesondere kann der rohrförmige Körper auch aus einem anderen Werkstoff als der Verdrängerkörper beziehungsweise die Verdrängerkörperwelle, für die ein Stahlwerkstoff bevorzugt ist, bestehen. Beispielsweise auch aus einem Leichtmetall wie etwa Aluminium. Bei einer zweiteiligen Ausführung von Verdrängerkörpern und Verdrängerkörperwellen können auch die Verdrängerkörper aus einem anderen Werkstoff als die Verdrängerkörperwellen bestehen, beispielsweise auch aus Aluminium.The displacement body shaft can also be mounted on the suction side by means of the displacement body. This further preferably by means of the cover part. The tubular body can be designed practically alone on the passage of the cooling liquid in terms of its structural design. In particular, the tubular body may also consist of a different material than the displacement body or the displacement body shaft, for which a steel material is preferred. For example, from a light metal such as aluminum. In a two-part design of displacement bodies and displacement body shafts, the displacement bodies can also be made of a different material than the displacement body shafts, for example also of aluminum.

Nachstehend ist die Erfindung des Weiteren anhand der beigefügten Zeichnungen, die jedoch lediglich ein Ausführungsbeispiel darstellt, erläutert. Hierbei zeigt:

Fig. 1
eine schematische Querschnittsansicht einer Vakuumpumpe mit innen gekühlten Verdrängerkörpern; und
Fig. 2
eine Vergrößerung des durch eine Strichlinie begrenzten Bereichs der Darstellung der Figur 1.
The invention will be further explained below with reference to the accompanying drawings, which, however, illustrate only one embodiment. Hereby shows:
Fig. 1
a schematic cross-sectional view of a vacuum pump with internally cooled displacers; and
Fig. 2
an enlargement of the area delimited by a dashed line of the representation of FIG. 1 ,

Dargestellt und beschrieben ist eine in Figur 1 im Querschnitt dargestellte Vakuumpumpe 1, die beim Ausführungsbeispiel als Schraubenpumpe ausgebildet ist. Die Vakuumpumpe 1 weist eine erste Verdrängerkörperwelle 2 und eine zweite Verdrängerkörperwelle 3 auf. Eine Verdrängerkörperwelle 2, 3 weist eine geometrische (Längs-) Achse A auf.Shown and described is an in FIG. 1 illustrated in cross-section vacuum pump 1, which is formed in the embodiment as a screw pump. The vacuum pump 1 has a first displacement body shaft 2 and a second displacement body shaft 3. A displacement body shaft 2, 3 has a geometrical (longitudinal) axis A.

Vorzugsweise handelt es sich um eine trocken laufende Pumpe.Preferably, it is a dry-running pump.

Die Vakuumpumpe 1 weist weiter ein Pumpengehäuse auf, das in ein Gehäuseteil 4 betreffend einen Arbeitsraum 5 und ein Gehäuseteil 6, das einen Motor-/Getrieberaum 7 ausbildet, unterteilt ist. Bei den Gehäuseteilen 4, 6 handelt es sich, insbesondere hinsichtlich des Gehäuseteils 6, um radial zu den Verdrängerkörperwellen 2, 3 geschlossene und bevorzugt insofern integral ausgebildete Gehäuseteile. Es kann sich beispielsweise um (Stahl- oder Aluminium-) Gussteile handeln.The vacuum pump 1 further has a pump housing, which is divided into a housing part 4 relating to a working space 5 and a housing part 6, which forms a motor / gear chamber 7. The housing parts 4, 6 are, in particular with regard to the housing part 6, to housing parts which are closed radially and in relation to the positive-displacement body shafts 2, 3, and are preferably integrally formed in this respect. For example, it may be cast (steel or aluminum) castings.

Das Gehäuseteil 6 ist rückseitig durch eine Verschlussplatte 8 verschlossen, in der die Verdrängerkörperwellen 2,3 endseitig gelagert sind. Bei der Verdrängerkörperwelle 2 ist hier, nur schematisch angedeutet, außenseitig des Verschlussteils 8 noch eine Ölpumpe 9 angeordnet, die auch von der Verdrängerkörperwelle 2 angetrieben ist. Die Ölpumpe 9 sorgt für die Ölversorgung im Motor-/Getrieberaum 7 sowie auch, da durch die Ölflüssigkeit realisiert, für die Kühlflüssigkeit und deren Transport beziehungsweise Umwälzung, wie nachstehend noch im Einzelnen beschrieben.The housing part 6 is closed at the back by a closure plate 8 in which the displacement body shafts 2, 3 are mounted at the end. In the case of the displacer shaft 2, here, only indicated schematically, an oil pump 9, which is also driven by the displacer body shaft 2, is arranged on the outside of the closure part 8. The oil pump 9 provides for the oil supply in the engine / transmission chamber 7 and also, as realized by the oil, for the cooling liquid and its transport or circulation, as described in detail below.

Zwischen dem Motor-/Getrieberaum 7 und dem Arbeitsraum 5 ist eine Trennwand 10 ausgebildet. In der Trennwand 10 sind die Verdrängerkörperwellen 2, 3 mittels Lagern 11 gelagert.Between the engine / gear chamber 7 and the working space 5, a partition wall 10 is formed. In the partition wall 10, the displacement body shafts 2, 3 are mounted by means of bearings 11.

Arbeitsraumseitig sind die Verdrängerkörperwellen 2, 3 mit Verdrängerkörpern 12,13 versehen. Diese wirken beim Ausführungsbeispiel in üblicher Weise schraubenartig zusammen, ohne sich jedoch zu berühren. Die Verdrängerkörper 12,13 können grundsätzlich einteilig mit der jeweiligen Verdrängerkörperwelle 2, 3 ausgeführt sein. Beim Ausführungsbeispiel und bevorzugt sind sie jedoch gesondert ausgebildet und mit den Verdrängerkörperwellen beispielsweise formschluss- und/oder schraubverbunden.Working space side, the displacement body shafts 2, 3 are provided with displacers 12,13. These act helically in the usual manner in the embodiment, but without touching. The displacement body 12,13 can basically be made in one piece with the respective displacement body shaft 2, 3. In the embodiment and preferred, however, they are designed separately and with the Verdrängerkörperwellen example formschluss- and / or screw-connected.

Zugeordnet ihrem saugseitigen Endbereich sind die jeweils mit einer zylindrischen Ausnehmung 14 ausgebildeten Verdrängerkörper 12, 13 vermittels eines die Ausnehmung 14 abdeckenden Deckelteils 15 über ein Lager 16 in dem Gehäuse 4 gelagert. Das Deckelteil 15 ist unmittelbar an einem Verdrängerkörper 12, 13 befestigt und rotiert mit diesem. Das Deckelteil 15 kann in einfacher Weise mittels eines O-Ringes 29 gegenüber der Verdrängerkörperwelle beziehungsweise dem jeweiligen Verdrängerkörper abgedichtet sein.Assigned to its suction-side end region, the displacement bodies 12, 13 each formed with a cylindrical recess 14 are mounted in the housing 4 via a bearing 16 by means of a cover part 15 covering the recess 14. The lid part 15 is directly attached to a displacement body 12, 13 and rotates with this. The lid part 15 can be sealed in a simple manner by means of an O-ring 29 with respect to the displacement body shaft or the respective displacement body.

Die Verdrängerkörperwellen 2, 3 sind darüber hinaus beim Ausführungsbeispiel über einen einzigen, mit der Verdrängerkörperwelle 3 zusammenwirkenden Motor 17 angetrieben und über ein Getriebe 18 untereinander gekoppelt. Die in dem Verdrängerkörper 12 beziehungsweise 13 ausgebildete Ausnehmung 14 erstreckt sich, beginnend an einem saugseitigen Ende 19 eines Verdrängerkörpers 12 beziehungsweise 13, über einen erheblichen Teil der Länge des Verdrängerkörpers 12 beziehungsweise 13, konzentrisch zu einer Längsachse A einer Verdrängerkörperwelle 2, 3 beziehungsweise des Verdrängerkörpers 12,13.The displacement body shafts 2, 3 are also driven in the embodiment of a single, cooperating with the displacement body shaft 3 motor 17 and coupled to each other via a gear 18. The recess 14 formed in the displacement body 12 or 13 extends, starting at a suction-side end 19 of a displacement body 12 or 13, over a considerable part of the length of the displacement body 12 or 13, concentric with a longitudinal axis A of a displacement body shaft 2, 3 or of the displacement body 12.13.

Innerhalb der Ausnehmung 14 erstreckt sich, ebenfalls konzentrisch zu der Achse A, ein rohrförmiger Körper 20. Der rohrförmige Körper 20 ist einerseits in dem Deckelteil 15 und andererseits in der Verdrängerkörperwelle 2 befestigt. Er rotiert entsprechend zusammen mit der Verdrängerkörperwelle 2 beziehungsweise 3 beziehungsweise dem Verdrängerkörper 12.Within the recess 14 extends, also concentric with the axis A, a tubular body 20. The tubular body 20 is fixed on the one hand in the cover part 15 and on the other hand in the displacement body shaft 2. It rotates correspondingly together with the displacement body shaft 2 or 3 or the displacement body 12.

Der rohrförmige Körper 20, siehe insbesondere auch Figur 2, dient zur Durchleitung von Kühlflüssigkeit, die beim Ausführungsbeispiel durch die vermittels der Ölpumpe 9 in den Motor-/Getrieberaum 7 gepumpte beziehungsweise darin umgewälzte Ölflüssigkeit gegeben ist, bis zum saugseitigen Ende eines Verdrängerkörpers 12,13. Hierzu weist der rohrförmige Körper 20 im Bereich des Deckelteils 15 Austrittsöffnungen 21 für die Kühlflüssigkeit auf. Der Austritt der Kühlflüssigkeit unmittelbar an dem Deckelteil 15 ist auch günstig im Hinblick auf eine Kühlung des Lagers 16. Die Kühlflüssigkeit wird im Einzelnen, was jedoch gesondert nicht dargestellt ist, in die Verdrängerkörperwelle 2, 3 eingespritzt, und zwar in einen dem Motor-/Getrieberaum 7 zugeordneten Bereich, bevor, gesehen in Richtung auf einen Verdrängerkörper 12, 13, der rohrförmige Körper 20 beginnt.The tubular body 20, see in particular also FIG. 2 , Is used for the passage of cooling liquid, which is given in the embodiment by the means of the oil pump 9 in the engine / gear chamber 7 pumped or circulated in oil fluid, to the suction end of a displacement body 12,13. For this purpose, the tubular body 20 in the region of the cover part 15 on outlet openings 21 for the cooling liquid. The exit of the cooling liquid directly on the cover part 15 is also favorable with regard to a cooling of the bearing 16. The cooling liquid is injected in detail, which is not shown separately, in the displacement body shaft 2, 3, in a motor / Gear box 7 associated area before, as seen in the direction of a displacer 12, 13, the tubular body 20 begins.

Die Ausnehmung 14 weist zunächst, vom saugseitigen Ende eines Verdrängerkörpers 12 beziehungsweise 13 aus gesehen, einen größeren Durchmesser D und sodann einen kleineren Durchmesser d auf. Der größere Durchmesser D entspricht bevorzugt dem 3- bis 7-fachen eines Außendurchmessers R des rohrförmigen Körpers 20. Der kleinere Durchmesser d entspricht bevorzugt dem 1,2- bis 2-fachen des Außendurchmessers R des rohrförmigen Körpers 20.The recess 14 initially has, seen from the suction end of a displacement body 12 and 13, a larger diameter D and then a smaller diameter d. The larger diameter D preferably corresponds to 3 to 7 times an outer diameter R of the tubular body 20. The smaller diameter d preferably corresponds to 1.2 to 2 times the outer diameter R of the tubular body 20.

Weiter erstreckt sich der Bereich des größeren Durchmessers D der Ausnehmung 14 in dem Verdrängerkörper 12 beziehungsweise 13 über eine Länge 1, gesehen von dem Deckelteil 15 aus, die bevorzugt der Hälfte bis 4/5 der Gesamtlänge L eines Verdrängerkörpers 12 beziehungsweise 13 entspricht.Furthermore, the region of the larger diameter D of the recess 14 in the displacer 12 or 13 extends over a length 1, seen from the lid member 15, which preferably one half to 4/5 of the total length L of the displacement body 12 and 13 corresponds.

Der rohrförmige Körper 20 durchsetzt weiter ersichtlich freikragend eine Bohrung 22 der Verdrängerkörperwelle 2 beziehungsweise 3. Diese Bohrung 22 ist bevorzugt mit einem gleichen Durchmesser und fluchtend zu der den Durchmesser d aufweisenden Bohrung 23 des Verdrängerkörpers 12 beziehungsweise 13 ausgebildet. Die Bohrung 22 der Verdrängerkörperwelle 2 beziehungsweise 3 geht sodann in eine demgegenüber durchmesserkleinere Bohrung 24 der Verdrängerkörperwelle 2 beziehungsweise 3 über, in welcher der rohrförmige Körper 20 weiterhin frei durchsetzend angeordnet ist. Die Bohrungen 22, 24 stellen zusammengefasst einen Durchsetzungsabschnitt der Verdrängerkörperwelle 2, 3 dar. Im Anschluss an die Bohrung 24 schließlich ist zur Ausbildung eines Befestigungsabschnitts eine Halterungsbohrung 25 nochmals geringeren Durchmessers in der Verdrängerkörperwelle 2 beziehungsweise 3 ausgebildet, in der ein diesbezügliches Ende 26 des rohrförmigen Körpers 20 gehaltert ist. Das Ende 26 ist ein hinsichtlich der Wandstärke des rohrförmigen Körpers 20 außen reduzierter Bereich, so dass sich an dem rohrförmigen Körper 20 eine Anlageschulter 27 ergibt die gegen eine entsprechende Lagerschulter 28 der Verdrängerkörperwelle 2, 3 anliegt. Durch das Anliegen der Anlageschulter 27 an der Lagerschulter 28 einerseits und die anderendig gegebene Anlage des rohrförmigen Körpers 20 in dem Deckelteil 15 ist die axiale Lage des rohrförmigen Körpers 20 in dem Verbund von Verdrängerkörperwelle und Verdrängerkörper festgelegt. Die Halterung des Endes 26 in der Verdrängerkörperwelle 2, 3 kann beispielsweise mittels eines Federelementes, entsprechend einer für Wellen bekannten Nut-/Federverbindung, durch radial feste Verspannung erreicht sein.The tubular body 20 further extends freely projecting a bore 22 of the displacement body shaft 2 and 3. This bore 22 is preferably formed with an equal diameter and aligned with the diameter d having bore 23 of the displacer 12 and 13 respectively. The bore 22 of the displacement body shaft 2 or 3 then passes into a contrast smaller diameter bore 24 of the displacement body shaft 2 and 3, in which the tubular body 20 is further arranged freely passing through. The holes 22, 24 summarize an enforcement section of the displacement body shaft 2, 3 represents. Following the bore 24 finally a support hole 25 is again smaller diameter formed in the Verdrängerkörperwelle 2 and 3, respectively, to form a mounting portion in which a related end 26 of the tubular Body 20 is held. The end 26 is an externally reduced area with regard to the wall thickness of the tubular body 20, so that a contact shoulder 27 results on the tubular body 20 and rests against a corresponding bearing shoulder 28 of the displacement body shaft 2, 3. Due to the abutment of the abutment shoulder 27 on the bearing shoulder 28 on the one hand and the other end given system of the tubular body 20 in the cover part 15, the axial position of the tubular body 20 is fixed in the composite of displacement body shaft and displacer. The holder of the end 26 in the displacement body shaft 2, 3 can be achieved, for example by means of a spring element, corresponding to a groove / spring connection known for waves, by radially fixed clamping.

Der Verdrängerkörper 12,13 weist im Einzelnen im Anschluss an die Ausnehmung 14 gesehen vom Deckel 15 aus, einen Passbohrungsabschnitt 30 auf, in welcher ein Verbindungsabschnitt 31 der Verdrängerkörperwelle 2, 3 einsitzt. Auf einer Stirnfläche 32 des Verbindungsabschnittes 31 sitzt ein Scheibenkörper 33, der von Befestigungsschrauben 34 durchsetzt ist.The displacement body 12, 13 has, viewed in detail following the recess 14 from the cover 15, a fitting bore section 30, in which a connecting section 31 of the displacement body shaft 2, 3 is seated. On an end face 32 of the connecting portion 31 sits a disk body 33 which is penetrated by fastening screws 34.

Der Scheibenkörper 33 weist zugeordnet der Bohrung 23, zum Übergang in diese, eine entsprechende Bohrung mit einer einströmseitig ausgebildeten Abrundung 35 auf.The disk body 33 has associated with the bore 23, for the transition into this, a corresponding bore with an inflow-side rounded 35 on.

Von der Bohrung 22 in der Verdrängerkörperwelle 2, 3 beziehungsweise der Bohrung 24 gehen mehrere Radialbohrungen 36 aus, um die durch diese Bohrungen außenseitig zu dem rohrförmigen Körper 20 zurückströmende Kühlflüssigkeit in den Motor-/Getrieberaum 7 zurückzuleiten. Aufgrund der durch die Umdrehung der Verdrängerkörperwellen 2, 3 gegebenen Radialkräfte ergibt sich hier ein praktisch selbsttätiges Zurückschleudern der Kühlflüssigkeit in den Raum. Einige der Bohrungen 36 können auch, wie dargestellt, gesehen von dem Arbeitsraum 5 aus, vor den Lagern 11 in einen Umgebungsraum der Verdrängerkörperwelle 2, 3 münden.From the bore 22 in the displacement body shaft 2, 3 or the bore 24 go from a plurality of radial bores 36 to the back through these bores on the outside of the tubular body 20 flowing back cooling liquid into the engine / transmission chamber 7. Due to the given by the rotation of the Verdrängerkörperwellen 2, 3 radial forces here is a practically automatic spin-back of the cooling liquid in the room. Some of the bores 36 can also, as shown, open from the working space 5, in front of the bearings 11 into an environmental space of the displacement body shaft 2, 3.

Die vorstehend angegebenen Bereiche beziehungsweise Wertebereiche schließen hinsichtlich der Offenbarung auch sämtliche Zwischenwerte ein, insbesondere in 1/10 Schritten des jeweiligen Verhältnisses, einerseits zur Eingrenzung der genannten Bereichsgrenzen von unten und/oder oben, alternativ oder ergänzend aber auch im Hinblick auf die Offenbarung eines oder mehrerer singulärer Werte aus einem jeweiligen Bereich.The above ranges or ranges of values close with respect to the disclosure and all intermediate values, particularly in 1 / 10th steps of the respective ratio, on the one hand to limit said range limits from below and / or above, alternatively or in addition, but also in view of the disclosure of one or several singular values from a particular area.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11 Vakuumpumpevacuum pump 2727 Anlageschultercontact shoulder 22 VerdrängerkörperwelleVerdrängerkörperwelle 2828 Lagerschulterbearing shoulder 33 VerdrängerkörperwelleVerdrängerkörperwelle 2929 O-RingO-ring 44 Gehäusecasing 3030 PassbohrungsabschnittPass bore section 55 Arbeitsraumworking space 3131 Verbindungsabschnittconnecting portion 66 Gehäuseteilhousing part 3232 Stirnflächeface 77 Motor-/GetrieberaumEngine / transmission room 3333 Scheibenkörperwasher body 88th Verschlussteilclosing part 3434 Befestigungsschraubenmounting screws 99 Ölpumpeoil pump 3535 Abrundungrounding off 1010 Trennwandpartition wall 3636 Radialbohrungenradial bores 1111 Lagercamp DD Durchmesserdiameter 1212 Verdrängerkörperdisplacement dd Durchmesserdiameter 1313 Verdrängerkörperdisplacement RR Außendurchmesserouter diameter 1414 Ausnehmungrecess ll Längelength 1515 Deckelcover LL Gesamtlängeoverall length 1616 Lagercamp AA geometrische Achsegeometric axis 1717 Motorengine 1818 Getriebetransmission 1919 saugseitiges Endesuction end 2020 rohrförmiger Körpertubular body 2121 Austrittsöffnungoutlet opening 2222 Bohrungdrilling 2323 Bohrungdrilling 2424 Bohrungdrilling 2525 Halterungsbohrungholder bore 2626 EndeThe End

Claims (8)

  1. Vacuum pump, in particular a screw pump, having preferably two displacement body shafts (2, 3), coupled via a gearing, which drive displacement bodies (12, 13), a displacement body (12, 13) having a suction-side end and a pressure-side end and being cooled on the inside, and the vacuum pump (1) having a housing (4, 6) which is divided into a motor/gearing chamber (7) and a working chamber (5), and in addition a displacement body (12, 13) having an inner recess (14), extending in the direction of a geometric axis (A) of the displacement body shaft (2, 3), in which a tubular body (20) extends for conducting cooling fluid while leaving a free space between an inner surface of the recess (14) and an outer surface of the body (20), the cooling fluid being able to enter the free space from the body (20), and the body (20) being secured in the displacement body shaft (2, 3), in addition the body (20) being secured in a separate cover part (15) mounted on the suction-side end of the displacement body (12, 13), the free space being formed, at least in part, directly between the body (20) and the inner surface of the displacement body (12, 13) and the free space extending continuously from the cover part (15) to a securing region of the body (20) in the displacement body shaft (2, 3), characterized in that the securing region of the tubular body (20) is located in a region of the displacement body shaft (2, 3) which, for its part, is located within the motor/gearing chamber (7) of the housing (4, 6).
  2. Vacuum pump according to Claim 1, characterized in that the free space is formed, at least in part, directly between the body (20) which is formed, over its entire length, as a conventional tubular body having a uniform wall thickness, and the inner surface of the displacement body (12, 13).
  3. Vacuum pump according to Claim 1 or 2, characterized in that the tubular body (20) passes freely through a bore (22) in the displacement body shaft (2, 3), that the bore (22) in the displacement body shaft (2, 3) then merges into a bore (24), that has a smaller diameter, in the displacement body shaft (2, 3), in which the tubular body (20) is situated so that it continues to pass through freely, and, for forming the securing region, adjoining the bore (24), a mounting bore (25) having an even smaller diameter is formed in the displacement body shaft (2, 3), in which an end (26) of the tubular body (20) is mounted.
  4. Vacuum pump according to any of Claims 1 to 3, characterized in that the cooling fluid exits in the region of an end face of a displacement body (12, 13).
  5. Vacuum pump according to any of the preceding claims, characterized in that the tubular body (20) is accommodated in a corresponding receiving recess in the displacement body shaft (2, 3).
  6. Vacuum pump according to Claim 5, characterized in that the receiving recess has the securing portion and a passage portion formed by bores provided with a larger opening cross-section.
  7. Vacuum pump according to any of the preceding claims, characterized in that the body (20) has one or more bores (36) extending in the radial direction for the passage of cooling fluid.
  8. Vacuum pump according to any of the preceding claims, characterized in that the cooling fluid is injectable into the displacement body shaft (2, 3) for entry into the body (20), which is open in an axial direction of the securing portion.
EP11799390.7A 2010-12-14 2011-12-06 Vacuum pump Active EP2652332B1 (en)

Applications Claiming Priority (2)

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DE102010061202A DE102010061202A1 (en) 2010-12-14 2010-12-14 vacuum pump
PCT/EP2011/071882 WO2012080034A2 (en) 2010-12-14 2011-12-06 Vacuum pump

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EP2652332A2 EP2652332A2 (en) 2013-10-23
EP2652332B1 true EP2652332B1 (en) 2015-01-28

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US (1) US9624927B2 (en)
EP (1) EP2652332B1 (en)
JP (1) JP5886867B2 (en)
KR (1) KR101873904B1 (en)
CN (1) CN103261694B (en)
DE (1) DE102010061202A1 (en)
WO (1) WO2012080034A2 (en)

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US11359632B2 (en) 2014-10-31 2022-06-14 Ingersoll-Rand Industrial U.S., Inc. Rotary screw compressor rotor having work extraction mechanism
CN106401956A (en) * 2016-11-30 2017-02-15 南京妙策传媒有限公司 Oil screw compressor based on internal cooling treatment
EP3499039B1 (en) * 2017-12-15 2021-03-31 Pfeiffer Vacuum Gmbh Screw vacuum pump

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410172A (en) * 1941-05-31 1946-10-29 Jarvis C Marble Rotary screw wheel apparatus
JPH10281089A (en) * 1997-04-03 1998-10-20 Matsushita Electric Ind Co Ltd Vacuum pump
DE19745616A1 (en) * 1997-10-10 1999-04-15 Leybold Vakuum Gmbh Cooling system for helical vacuum pump
DE19963172A1 (en) * 1999-12-27 2001-06-28 Leybold Vakuum Gmbh Screw-type vacuum pump has shaft-mounted rotors each with central hollow chamber in which are located built-in components rotating with rotor and forming relatively narrow annular gap through which flows cooling medium
DE19963171A1 (en) 1999-12-27 2001-06-28 Leybold Vakuum Gmbh Screw-type vacuum pump used in cooling circuits has guide components located in open bores in shafts serving for separate guiding of inflowing and outflowing cooling medium
DE10039006A1 (en) * 2000-08-10 2002-02-21 Leybold Vakuum Gmbh Two-shaft vacuum pump
WO2006024818A1 (en) 2004-09-02 2006-03-09 The Boc Group Plc Cooling of pump rotors
DE102005012040A1 (en) * 2005-03-16 2006-09-21 Gebr. Becker Gmbh & Co Kg Rotor and screw vacuum pump
JP2007126993A (en) * 2005-11-01 2007-05-24 Toyota Industries Corp Vacuum pump
DE102010064388A1 (en) * 2010-02-18 2011-08-18 Steffens, Ralf, Dr. Ing., 73728 Drying-compressing two-shaft rotation positive displacement machine e.g. spindle compressor, for e.g. compressing gaseous conveying media, has intake-sided and gear box-sided spindle main rotor shaft parts made of sustainable material
WO2012055734A2 (en) 2010-10-27 2012-05-03 Gebr. Becker Gmbh Vacuum pump

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CN103261694B (en) 2016-01-20
DE102010061202A1 (en) 2012-06-14
US20130224055A1 (en) 2013-08-29
US9624927B2 (en) 2017-04-18
CN103261694A (en) 2013-08-21
WO2012080034A3 (en) 2012-08-09
WO2012080034A2 (en) 2012-06-21
EP2652332A2 (en) 2013-10-23
KR101873904B1 (en) 2018-07-03
JP5886867B2 (en) 2016-03-16
KR20140029370A (en) 2014-03-10
JP2013545932A (en) 2013-12-26

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