EP2079932A1 - Vacuum pump having an outlet valve - Google Patents

Vacuum pump having an outlet valve

Info

Publication number
EP2079932A1
EP2079932A1 EP07856378A EP07856378A EP2079932A1 EP 2079932 A1 EP2079932 A1 EP 2079932A1 EP 07856378 A EP07856378 A EP 07856378A EP 07856378 A EP07856378 A EP 07856378A EP 2079932 A1 EP2079932 A1 EP 2079932A1
Authority
EP
European Patent Office
Prior art keywords
vacuum pump
sealing body
pump according
air outlet
outlet opening
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.)
Withdrawn
Application number
EP07856378A
Other languages
German (de)
French (fr)
Inventor
Dirk Ehrenfeld
Willi Schneider
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.)
Joma Polytec GmbH
Original Assignee
Joma Hydromechanic GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Joma Hydromechanic GmbH filed Critical Joma Hydromechanic GmbH
Publication of EP2079932A1 publication Critical patent/EP2079932A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04C18/344—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 inner member
    • F04C18/3441—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 inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C18/3442—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 inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the inlet and outlet opening
    • 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
    • F04C18/344—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 inner member
    • F04C18/3441—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 inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
    • 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
    • F04C2220/00—Application
    • F04C2220/10—Vacuum

Definitions

  • the invention relates to a vacuum pump with a cup-shaped housing, a rotor rotatably mounted eccentrically in the housing, a rotatably mounted in the rotor orthogonal to the axis of rotation, which abuts with its wing tips on a working space bounding inner peripheral surface of the housing while the working space in a suction chamber and a Pressure chamber divided, and the suction chamber with an air inlet opening and the pressure chamber with a
  • Air outlet opening are provided, wherein the air outlet opening is provided with an outlet valve, and the outlet valve has a directly resting on the air outlet opening sealing body.
  • Vacuum pumps with such a structure are known for example from DE 10 2004 034 926 Bl. They usually have a housing in which a rotor is rotatably mounted, wherein the rotor is located in a working space. Such vacuum pumps are used inter alia in vehicles, where, for example, the motor of the motor vehicle rotates the rotor. These vacuum pumps are lubricated with oil, which also serves to seal the sealing gap between the wing and working space in order to achieve high efficiency.
  • an outlet valve is provided, which is designed in the manner of a leaf spring.
  • This leaf spring presses on the outside of the air outlet and closes it.
  • the leaf spring can be bent over the prevailing pressure in the pressure chamber to the outside. As a result, the compressed air is expelled from the pressure space in the pressure line.
  • Such a device is for Example from DE 40 19 854 B4 known. With this vacuum pump it has been found that with leaf springs closed air outlet openings, which are not completely covered when sweeping the wing, relatively high losses occur.
  • the invention is therefore based on the object to provide a vacuum pump, wherein it is ensured that the air compressed in the pressure chamber is completely discharged into the pressure line and is not transferred to the pressure chamber located behind the wing.
  • the sealing body is not clamped on one side and therefore cantilevered as in the prior art, but is fixed in the direction of rotation of the rotor both at the front end and at the rear end of the air outlet opening on the housing.
  • This type of attachment has the significant advantage that when blowing off the valve does not fully swing open but only the Area is available, which is required to pass through the flowing volume. Therefore, no air can flow into the subsequent, ie behind the wing pressure chamber. This means that the compressed air in the pressure chamber, the sealing surface in this section imprints, in which there is the overpressure.
  • the sealing body is sufficiently elastic that it does not lift off over the entire length of the air outlet opening, but only in the section in which there is a sufficiently large overpressure. However, this is always in the direction of rotation of the rotor in front of the wing.
  • a sealing element consisting of spring steel always lifts from the sealing seat over the entire length and not in sections.
  • the sealing body is elastic, in particular rubber-elastic.
  • an optimal nestling and sealing of sealing body is achieved at the sealing surface.
  • the above-described opening advantageously assists you in that the material of the sealing body is stretchable.
  • the outlet valve according to the invention is bent in the circumferential direction as well as the known from the prior art leaf spring and has in particular a C or kidney-shaped.
  • the sealing body bears against the side of the air outlet opening facing away from the pressure chamber. This will ddas Exhaust valve and in particular the sealing body easily accessible for repair and maintenance.
  • the outlet valve on a sealing body cross-supporting body.
  • This support body serves not only for fixing and fixing the sealing body to the housing but also for adjusting the opening time of the valve, e.g. is determined by more or less far reaching the tension of the sealing body.
  • the support body lies substantially in the areas on the sealing body, in which the sealing body bears against the housing.
  • the sealing body remains flexible in the region of the opening.
  • the support body in the region of the air outlet opening at a distance from the sealing body, or the support body is recessed in this area.
  • the sealing body remains movable there and can stand out from the housing and in particular from the edge of the opening.
  • a variant provides that the sealing body between the housing and the support body is arranged, in particular firmly clamped. This represents a simple way of attachment.
  • sealing body is vulcanized onto the support body.
  • supporting body and sealing body can be handled together, i. attached or replaced in case of repair.
  • the support body is recessed open edge in the region of the air outlet opening and the sealing body is vulcanized to the edge of the recesses.
  • the support body and the sealing body are formed as a one-piece valve body, so that they, as already mentioned, can be handled together.
  • valve body in the region of the air outlet opening for forming the sealing body has a smaller material thickness than in the adjacent areas.
  • the material thickness is so low that the area is elastically deformable.
  • the sealing body consists of plastic, in particular a thermoplastic or elastomer.
  • Figure 1 is a vacuum pump with removed housing cover
  • FIG. 2 shows the rear side of the vacuum pump, the drive of the rotor and the outlet valve
  • Figure 3 is a perspective view of a valve body
  • Figure 4 is a perspective view of a portion of the valve body in the working position
  • FIG. 5 shows a section V - V according to FIG. 2 through the outlet valve in its open position.
  • a vacuum pump in which the housing 12 is shown without housing cover.
  • the housing 12 has a suction port 14, which opens into an interior 16.
  • a generally designated 18 rotor in which a wing 20 is mounted orthogonal to the axis of rotation 21 slidably.
  • the rotor 18 has a rotor housing 24, with which it bears against an inner circumferential surface 22 of the working space 30.
  • the rotor 18 passes through the housing 12, in particular a bottom 26 of the interior 18, via a drive opening 28, so that it protrudes from the housing 12 on the rear side so that it can be rotated by means of a drive (not shown) on a coupling.
  • the interior 16 is divided by the wing 20 into a suction chamber 32 and a pressure chamber 34.
  • the direction of rotation of the rotor 20 is indicated by an arrow 36.
  • the in the pressure chamber 34 located and arranged in the bottom 26 of the housing 12 air outlet opening 38 is partially visible. This air outlet opening 38 could also be provided in the peripheral surface 22.
  • FIG. 2 shows the rear side of the housing 12 of the vacuum pump 10 and shows the outlet valve 40 located behind the air outlet opening 38.
  • a second outlet valve 42 can be seen. If the rotor 18 rotates in the direction indicated by the arrow 36 in FIG. 1, ie in the normal working direction, then air is drawn in through the suction connection 14 and expelled through the air outlet opening 38. In addition, through the air outlet 38 Lubricating oil expelled. If the rotor 18 rotates in the opposite direction, then any lubricating oil must also be able to be ejected, which takes place via the other outlet opening with the outlet valve 42.
  • Both outlet valves 40 and 42 have the same structure and they can either each have a separate valve body or a common valve body 44. This valve body 44 is fixed by means of screws 6 on the housing 12.
  • FIGS 3 and 4 show the valve body 44 in an enlarged view. It can be seen that the valve body 44 has a C- or kidney-shaped shape and is partially offset on the radially inner longitudinal side 46.
  • the valve body 44 has a sealing body 48 and a seated on the sealing body 48 supporting body 50.
  • the above-mentioned paragraph is formed in that the support body 50 is provided with two recesses 52 which are open-edge in the direction of the longitudinal side 46. It can be seen that the sealing body 48 extends below the recesses 52.
  • This sealing body 48 consists of an elastic, in particular rubber-elastic material, preferably of plastic, in particular a thermoplastic or elastomer. In any case, the sealing body 48 is stretchable.
  • the valve body 44 is, as already mentioned, directly on the outlet openings 38 such that the sealing body 48 closes these openings.
  • the sealing body 48 in the recess 52 of the corresponding outlet valve 40 or 42 lifts off from the sealing seat, which is illustrated in FIG. Due to the elastic configuration of the sealing body 48, however, this lifts only in the narrow area within the recess 52, in which it is lifted by the internal pressure. In the adjacent areas of the sealing body 48 is still at the sealing seat. This prevents air from flowing into the working space 30.
  • the sealing body 48 is pressed in any case at the front and at the rear end of the recess 52 on the sealing seat and that the exhaust valve opens radially inward.
  • FIG. 5 shows a section V - V according to FIG. 2 with open outlet valve 40, ie.
  • open outlet valve 40 ie.
  • the air outlet opening 38 is seconded in the inner peripheral surface 22 of the housing 12 in the recess 52.

Abstract

The invention relates to a vacuum pump having a crucible-shaped housing, a rotor that is pivotally mounted in the housing in an eccentric manner, a blade that is supported displaceably in the rotor orthogonal to the axis of rotation, the blade abutting an inner circumferential surface of the housing with at least one of the blade tips, wherein the surface defines a working space, and thereby dividing the working space into an intake chamber and a pressure chamber. The intake chamber is equipped with an air intake opening, and the pressure chamber is equipped with an air outlet opening, wherein the air outlet opening is provided with an outlet valve (40), and the outlet valve has a sealing body (48) that rests directly on the air outlet opening (38), wherein the sealing body is attached to the opening at the front and rear ends of the air outlet opening in the direction of rotation (36) of the rotor, and permanently abuts the same.

Description

VAKUUMPUMPE MIT EINEM AUSLASSVENTIL VACUUM PUMP WITH AN OUTLET VALVE
Beschreibungdescription
Die Erfindung betrifft eine Vakuumpumpe mit einem topfförmigen Gehäuse, einem exzentrisch im Gehäuse drehbar gelagerten Rotor, einem im Rotor orthogonal zur Drehachse verschieblich gelagerten Flügel, der mit seinen Flügelspitzen an einer einen Arbeitsraum begrenzenden Innenumfangsflache des Gehäuses anliegt und dabei den Arbeitsraum in einen Saugraum und einen Druckraum unterteilt, und der Saugraum mit einer Lufteinlassöffnung und der Druckraum mit einerThe invention relates to a vacuum pump with a cup-shaped housing, a rotor rotatably mounted eccentrically in the housing, a rotatably mounted in the rotor orthogonal to the axis of rotation, which abuts with its wing tips on a working space bounding inner peripheral surface of the housing while the working space in a suction chamber and a Pressure chamber divided, and the suction chamber with an air inlet opening and the pressure chamber with a
Luftauslassöffnung versehen sind, wobei die Luftauslassöffnung mit einem Auslassventil versehen ist, und das Auslassventil einen direkt auf der Luftauslassöffnung aufliegenden Dichtkörper aufweist.Air outlet opening are provided, wherein the air outlet opening is provided with an outlet valve, and the outlet valve has a directly resting on the air outlet opening sealing body.
Vakuumpumpen mit einem derartigen Aufbau sind zum Beispiel aus der DE 10 2004 034 926 Bl bekannt. Sie weisen in der Regel ein Gehäuse auf, in welchem ein Rotor drehbar gelagert ist, wobei sich der Rotor in einem Arbeitsraum befindet. Derartige Vakuumpumpen werden unter anderem auch in Fahrzeugen eingesetzt, wo zum Beispiel der Motor des Kraftfahrzeugs den Rotor in Drehung versetzt. Diese Vakuumpumpen werden mit Öl geschmiert, welches auch dazu dient, den Dichtspalt zwischen Flügel und Arbeitsraum abzudichten, um einen hohen Wirkungsgrad zu erzielen.Vacuum pumps with such a structure are known for example from DE 10 2004 034 926 Bl. They usually have a housing in which a rotor is rotatably mounted, wherein the rotor is located in a working space. Such vacuum pumps are used inter alia in vehicles, where, for example, the motor of the motor vehicle rotates the rotor. These vacuum pumps are lubricated with oil, which also serves to seal the sealing gap between the wing and working space in order to achieve high efficiency.
An der Auslassöffnung ist ein Auslassventil vorgesehen, welches nach Art einer Blattfeder ausgebildet ist. Diese Blattfeder drückt von außen auf die Luftauslassöffnung und verschließt diese. Die Blattfeder kann über den im Druckraum herrschenden Überdruck nach außen aufgebogen werden. Dadurch wird die komprimierte Luft aus dem Druckraum in die Druckleitung ausgestoßen. Eine derartige Vorrichtung ist zum Beispiel aus der DE 40 19 854 B4 bekannt. Bei dieser Vakuumpumpe hat sich herausgestellt, dass bei mit Blattfedern verschlossenen Luftauslassöffnungen, welche beim Überstreichen des Flügels nicht vollständig abgedeckt werden, relativ hohe Verluste auftreten. Dies liegt darin begründet, dass dann, wenn der Flügel die Luftauslassöffnung überfährt und die Blattfeder von der ausströmenden, komprimierten Luft in die geöffnete Stellung bewegt wird, die Auslassöffnung vollständig geöffnet wird, d.h. hinter dem Flügel für den nachfolgenden Druckraum ebenfalls offen ist, so dass komprimierte Luft aus dem vor dem Flügel sich befindenden Druckraum nicht in die Druckleitung, sondern in den hinter dem Flügel sich befindenden Druckraum überströmt, in welchem die Luft einen wesentlich niedrigeren Druck aufweist. Es kann sogar bereits in die Druckleitung abgeförderte Luft in diesen hinter dem Flügel sich befindenden Druckraum zurück strömen, war zu erheblich Druckverlusten führt.At the outlet opening an outlet valve is provided, which is designed in the manner of a leaf spring. This leaf spring presses on the outside of the air outlet and closes it. The leaf spring can be bent over the prevailing pressure in the pressure chamber to the outside. As a result, the compressed air is expelled from the pressure space in the pressure line. Such a device is for Example from DE 40 19 854 B4 known. With this vacuum pump it has been found that with leaf springs closed air outlet openings, which are not completely covered when sweeping the wing, relatively high losses occur. This is because, when the wing passes over the air outlet opening and the leaf spring is moved from the outflowing, compressed air to the open position, the outlet opening is fully opened, ie behind the wing for the subsequent pressure chamber is also open, so that compressed air from the pressure chamber located in front of the wing does not flow into the pressure line, but into the pressure space located behind the wing, in which the air has a substantially lower pressure. It can even flow back into the pressure line conveyed air in this behind the wing located pressure chamber back, was leading to significant pressure losses.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vakuumpumpe bereitzustellen, bei welcher sichergestellt ist, dass die im Druckraum komprimierte Luft vollständig in die Druckleitung ausgestoßen und nicht in den hinter dem Flügel sich befindenden Druckraum übergeleitet wird.The invention is therefore based on the object to provide a vacuum pump, wherein it is ensured that the air compressed in the pressure chamber is completely discharged into the pressure line and is not transferred to the pressure chamber located behind the wing.
Diese Aufgabe wird mit einer Vakuumpumpe der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass der Dichtkörper am in Drehrichtung des Rotors vorderen und hinteren Ende der Luftauslassöffnung an dieser befestigt ist und permanent an dieser anliegt.This object is achieved with a vacuum pump of the type mentioned in the present invention, that the sealing body is attached to the front and rear end of the air outlet opening in the direction of rotation of the rotor and this is applied to this permanently.
Bei der erfindungsgemäßen Vakuumpumpe ist der Dichtkörper nicht wie beim Stand der Technik nur einseitig und deshalb frei auskragend eingespannt, sondern ist in Drehrichtung des Rotors gesehen sowohl am vordem Ende als auch am hinteren Ende der Luftauslassöffnung am Gehäuse fixiert. Diese Art der Befestigung hat den wesentlichen Vorteil , dass beim Abblasen das Ventil nicht vollständig aufschwenkt sondern lediglich den Bereich frei gibt, der zum Passieren des durchströmenden Volumens erforderlich ist. Daher kann keine Luft in den nachfolgenden, d.h. hinter dem Flügel liegenden Druckraum einströmen. Dies bedeutet, dass die im Druckraum komprimierte Luft die Dichtfläche in diesem Abschnitt aufdrückt, in welchem der Überdruck herrscht. Hat der Flügel einen Teil der Luftauslassöffnung und somit auch einen Teil des Auslassventils überfahren, dann herrscht lediglich noch vor dem Flügel ein Überdruck, der ein Abheben des Dichtkörpers von der Öffnung bewirkt. Hinter dem Flügel wird der Dichtkörper jedoch nicht von der Öffnung angehoben, da hierfür der Überdruck nicht ausreicht. Der Dichtkörper ist so ausreichend elastisch, dass er nicht über die gesamte Länge der Luftauslassöffnung abhebt, sondern lediglich in dem Abschnitt, in welchem ein ausreichend großer Überdruck herrscht. Dieser befindet sich aber stets in Drehrichtung des Rotors vor dem Flügel. Im Gegensatz hierzu hebt ein aus Federstahl bestehendes Dichtelement aufgrund der hohen Steifigkeit des Federstahls stets über die gesamte Länge vom Dichtsitz ab und nicht abschnittsweise.In the vacuum pump according to the invention, the sealing body is not clamped on one side and therefore cantilevered as in the prior art, but is fixed in the direction of rotation of the rotor both at the front end and at the rear end of the air outlet opening on the housing. This type of attachment has the significant advantage that when blowing off the valve does not fully swing open but only the Area is available, which is required to pass through the flowing volume. Therefore, no air can flow into the subsequent, ie behind the wing pressure chamber. This means that the compressed air in the pressure chamber, the sealing surface in this section imprints, in which there is the overpressure. If the wing has run over part of the air outlet opening and thus also a part of the outlet valve, then there is only an overpressure in front of the wing, which causes the sealing body to lift off from the opening. Behind the wing, however, the sealing body is not lifted from the opening, since this is not sufficient for the overpressure. The sealing body is sufficiently elastic that it does not lift off over the entire length of the air outlet opening, but only in the section in which there is a sufficiently large overpressure. However, this is always in the direction of rotation of the rotor in front of the wing. In contrast, due to the high rigidity of the spring steel, a sealing element consisting of spring steel always lifts from the sealing seat over the entire length and not in sections.
Erfindungsgemäß ist der Dichtkörper elastisch, insbesondere gummielastisch. Hierdurch wird ein optimales Aneinanderschmiegen und Abdichten von Dichtkörper an der Dichtfläche erreicht. Außerdem dir das oben beschriebene Öffnen vorteilhaft dadurch unterstützt, wenn das Material des Dichtkörpers dehnbar ist.According to the invention, the sealing body is elastic, in particular rubber-elastic. As a result, an optimal nestling and sealing of sealing body is achieved at the sealing surface. In addition, the above-described opening advantageously assists you in that the material of the sealing body is stretchable.
Um sich optimal an die Form der Auslassöffnung anzupassen, ist das erfindungsgemäße Auslassventil ebenso wie die aus dem Stand der Technik bekannte Blattfeder in Umfangsrichtung gebogen und besitzt insbesondere eine C- oder nierenförmige Gestalt.In order to adapt optimally to the shape of the outlet opening, the outlet valve according to the invention is bent in the circumferential direction as well as the known from the prior art leaf spring and has in particular a C or kidney-shaped.
Vorteilhaft liegt der Dichtkörper an der vom Druckraum abgewandten Seite der Luftauslassöffnung an. Dadurch wird ddas Auslassventil und insbesondere der Dichtkörper leicht zugänglich für Reparatur- und Wartungsarbeiten.Advantageously, the sealing body bears against the side of the air outlet opening facing away from the pressure chamber. This will ddas Exhaust valve and in particular the sealing body easily accessible for repair and maintenance.
Mit Vorzug weist das Auslassventil einen den Dichtkörper übergreifenden Stützkörper auf. Dieser Stützkörper dient nicht nur zur Befestigung und Fixierung des Dichtkörpers am Gehäuse sondern auch zur Einstellung des Öffnungszeitpunktes des Ventils, indem z.B. durch mehr oder weniger weites Übergreifen die Spannung des Dichtkörpers bestimmt wird.With preference, the outlet valve on a sealing body cross-supporting body. This support body serves not only for fixing and fixing the sealing body to the housing but also for adjusting the opening time of the valve, e.g. is determined by more or less far reaching the tension of the sealing body.
Erfindungsgemäß liegt der Stützkörper im Wesentlichen in den Bereichen am Dichtkörper an, in denen der Dichtkörper am Gehäuse anliegt. Dadurch bleibt der Dichtkörper im Bereich der Öffnung flexibel.According to the invention, the support body lies substantially in the areas on the sealing body, in which the sealing body bears against the housing. As a result, the sealing body remains flexible in the region of the opening.
Vorteilhaft weist der Stützkörper im Bereich der Luftauslassöffnung einen Abstand zum Dichtkörper auf, bzw. ist der Stützkörper in diesem Bereich ausgespart. Der Dichtkörper bleibt dort beweglich und kann sich vom Gehäuse und insbesondere vom Rand der Öffnung abheben.Advantageously, the support body in the region of the air outlet opening at a distance from the sealing body, or the support body is recessed in this area. The sealing body remains movable there and can stand out from the housing and in particular from the edge of the opening.
Eine Variante sieht vor, dass der Dichtkörper zwischen dem Gehäuse und dem Stützkörper angeordnet, insbesondere fest eingespannt ist. Diese stellt eine einfache Möglichkeit der Befestigung dar.A variant provides that the sealing body between the housing and the support body is arranged, in particular firmly clamped. This represents a simple way of attachment.
Eine andere Variante sieht vor, dass Dichtkörper auf den Stützkörper aufvulkanisiert ist. Dadurch können Stützkörper und Dichtkörper gemeinsam gehandhabt, d.h. befestigt oder im Reparaturfall auch ausgetauscht werden.Another variant provides that the sealing body is vulcanized onto the support body. As a result, supporting body and sealing body can be handled together, i. attached or replaced in case of repair.
Vorteilhaft ist der Stützkörper im Bereich der Luftauslassöffnung randoffen ausgespart und ist der Dichtkörper an den Rand der Aussparungen anvulkanisiert. Hierdurch wird eine Variante mit einer sehr flachen Bauform geschaffen. Erfindungsgemäß sind der Stützkörper und der Dichtkörper als einteiliger Ventilkörper ausgebildet, so dass sie, wie bereits erwähnt, gemeinsam gehandhabt werden können.Advantageously, the support body is recessed open edge in the region of the air outlet opening and the sealing body is vulcanized to the edge of the recesses. This creates a variant with a very flat design. According to the invention, the support body and the sealing body are formed as a one-piece valve body, so that they, as already mentioned, can be handled together.
Bei einer anderen Variante ist vorgesehen, dass der Ventilkörper im Bereich der Luftauslassöffnung zur Ausbildung des Dichtkörpers eine geringere Materialdicke aufweist als in den angrenzenden Bereichen. Dabei ist die Materialdicke derart gering, dass der Bereich elastisch verformbar ist. Diese Variante stellt eine einfache und preiswerte Lösung für das Ventil dar.In another variant, it is provided that the valve body in the region of the air outlet opening for forming the sealing body has a smaller material thickness than in the adjacent areas. The material thickness is so low that the area is elastically deformable. This variant represents a simple and inexpensive solution for the valve.
Um nach dem Öffnen des Ventil ein sicheres Schließen zu garantieren und um zu Vermeiden, dass sich der Dichtkörper beim Öffnen des Ventil, d.h. bim Abheben vom Rand der Öffnung, umstülpt, öffnet das Auslassventil radial nach innen.In order to ensure a safe closing after opening the valve and to avoid that the sealing body when opening the valve, i. When lifted from the edge of the opening, the outlet valve opens radially inwards.
Bei der erfindungsgemäßen Vakuumpumpe besteht der Dichtkörper aus Kunststoff, insbesondere einem Thermoplast oder Elastomer.In the case of the vacuum pump according to the invention, the sealing body consists of plastic, in particular a thermoplastic or elastomer.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung zwei besonders bevorzugte Ausführungsbeispiele im Einzelnen beschrieben sind. Dabei können die in der Zeichnung sowie in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Further advantages, features and details of the invention will become apparent from the subclaims and the following description in which two particularly preferred embodiments are described in detail with reference to the drawing. The features mentioned in the drawing and in the claims and in the description may each be essential to the invention individually or in any desired combination.
In der Zeichnung zeigen:In the drawing show:
Figur 1 eine Vakuumpumpe mit abgenommenem Gehäusedeckel;Figure 1 is a vacuum pump with removed housing cover;
Figur 2 die Rückseite der Vakuumpumpe, den Antrieb des Rotors sowie das Auslassventil zeigend;FIG. 2 shows the rear side of the vacuum pump, the drive of the rotor and the outlet valve;
Figur 3 eine perspektivische Ansicht eines Ventilkörpers; Figur 4 eine perspektivische Ansicht eines Abschnitts des Ventilkörpers in Arbeitsstellung; undFigure 3 is a perspective view of a valve body; Figure 4 is a perspective view of a portion of the valve body in the working position; and
Figur 5 einen Schnitt V - V gemäß Figur 2 durch das Auslassventil in dessen Offenstellung.FIG. 5 shows a section V - V according to FIG. 2 through the outlet valve in its open position.
In der Figur 1 ist mit dem Bezugszeichen 10 eine Vakuumpumpe bezeichnet, bei welcher das Gehäuse 12 ohne Gehäusedeckel dargestellt ist. Das Gehäuse 12 besitzt einen Sauganschluss 14, der in einen Innenraum 16 ausmündet. In diesem Innenraum 16 befindet sich ein insgesamt mit 18 bezeichneter Rotor, in welchem ein Flügel 20 orthogonal zur Drehachse 21 verschieblich gelagert ist. Der Rotor 18 weist ein Rotorgehäuse 24 auf, mit dem er an einer Innenumfangsflache 22 des Arbeitsraums 30 anliegt. Der Rotor 18 durchgreift das Gehäuse 12, insbesondere einen Boden 26 des Innenraums 18, über eine Antriebsöffnung 28, so dass er auf der Rückseite aus dem Gehäuse 12 herausragt, so dass er mittels eines nicht dargestellten Antriebs an einer Kupplung in Drehung versetzt werden kann. Der Innenraum 16 wird vom Flügel 20 in einen Saugraum 32 und einen Druckraum 34 unterteilt. Die Drehrichtung des Rotors 20 ist mit einem Pfeil 36 angedeutet. Außerdem ist die im Druckraum 34 sich befindende und im Boden 26 des Gehäuses 12 angeordnete Luftauslassöffnung 38 teilweise erkennbar. Diese Luftauslassöffnung 38 könnte auch in der Umfangsflache 22 vorgesehen sein.In the figure 1 is denoted by the reference numeral 10, a vacuum pump, in which the housing 12 is shown without housing cover. The housing 12 has a suction port 14, which opens into an interior 16. In this interior 16 is a generally designated 18 rotor, in which a wing 20 is mounted orthogonal to the axis of rotation 21 slidably. The rotor 18 has a rotor housing 24, with which it bears against an inner circumferential surface 22 of the working space 30. The rotor 18 passes through the housing 12, in particular a bottom 26 of the interior 18, via a drive opening 28, so that it protrudes from the housing 12 on the rear side so that it can be rotated by means of a drive (not shown) on a coupling. The interior 16 is divided by the wing 20 into a suction chamber 32 and a pressure chamber 34. The direction of rotation of the rotor 20 is indicated by an arrow 36. In addition, the in the pressure chamber 34 located and arranged in the bottom 26 of the housing 12 air outlet opening 38 is partially visible. This air outlet opening 38 could also be provided in the peripheral surface 22.
In der Figur 2 ist die Rückseite des Gehäuses 12 der Vakuumpumpe 10 dargestellt und es ist das hinter der Luftauslassöffnung 38 sich befindende Auslassventil 40 erkennbar. Neben diesem Auslassventil 40 ist ein zweites Auslassventil 42 erkennbar. Dreht der Rotor 18 in der in der Figur 1 mit dem Pfeil 36 angedeuteten Richtung, also in normaler Arbeitsrichtung, dann wird durch den Sauganschluss 14 Luft angesaugt und durch die Luftauslassöffnung 38 ausgestoßen. Außerdem wird durch die Luftauslassöffnung 38 Schmieröl ausgestoßen. Dreht der Rotor 18 in die entgegengesetzte Richtung, dann muss eventuelles Schmieröl ebenfalls ausgestoßen werden können, was über die andere Auslassöffnung mit dem Auslassventil 42 erfolgt. Beide Auslassventile 40 und 42 sind gleich aufgebaut und sie können entweder jeweils einen separaten Ventilkörper oder einen gemeinsamen Ventilkörper 44 besitzen. Dieser Ventilkörper 44 ist mittels Schrauben 6 am Gehäuse 12 fixiert.FIG. 2 shows the rear side of the housing 12 of the vacuum pump 10 and shows the outlet valve 40 located behind the air outlet opening 38. In addition to this outlet valve 40, a second outlet valve 42 can be seen. If the rotor 18 rotates in the direction indicated by the arrow 36 in FIG. 1, ie in the normal working direction, then air is drawn in through the suction connection 14 and expelled through the air outlet opening 38. In addition, through the air outlet 38 Lubricating oil expelled. If the rotor 18 rotates in the opposite direction, then any lubricating oil must also be able to be ejected, which takes place via the other outlet opening with the outlet valve 42. Both outlet valves 40 and 42 have the same structure and they can either each have a separate valve body or a common valve body 44. This valve body 44 is fixed by means of screws 6 on the housing 12.
Die Figuren 3 und 4 zeigen den Ventilkörper 44 in vergrößerter Darstellung. Es ist erkennbar, dass der Ventilkörper 44 eine C- oder nierenförmige Gestalt besitzt und an der radial inneren Längsseite 46 teilweise abgesetzt ist.Figures 3 and 4 show the valve body 44 in an enlarged view. It can be seen that the valve body 44 has a C- or kidney-shaped shape and is partially offset on the radially inner longitudinal side 46.
Der Ventilkörper 44 weist einen Dichtkörper 48 und einen auf dem Dichtkörper 48 aufsitzenden Stützkörper 50 auf. Der oben erwähnte Absatz wird dadurch gebildet, dass der Stützkörper 50 mit zwei Aussparungen 52 versehen ist, die in Richtung der Längsseite 46 randoffen sind. Es ist erkennbar, dass sich unter den Aussparungen 52 der Dichtkörper 48 erstreckt. Dieser Dichtkörper 48 besteht aus einem elastischen, insbesondere gummielastischen Material, bevorzugt aus Kunststoff, insbesondere einem Thermoplast oder Elastomer. Auf jeden Fall ist der Dichtkörper 48 dehnbar. Der Ventilkörper 44 liegt, wie bereits erwähnt, direkt auf den Auslassöffnungen 38 derart auf, dass der Dichtkörper 48 diese Öffnungen verschließt.The valve body 44 has a sealing body 48 and a seated on the sealing body 48 supporting body 50. The above-mentioned paragraph is formed in that the support body 50 is provided with two recesses 52 which are open-edge in the direction of the longitudinal side 46. It can be seen that the sealing body 48 extends below the recesses 52. This sealing body 48 consists of an elastic, in particular rubber-elastic material, preferably of plastic, in particular a thermoplastic or elastomer. In any case, the sealing body 48 is stretchable. The valve body 44 is, as already mentioned, directly on the outlet openings 38 such that the sealing body 48 closes these openings.
Herrscht im Druckraum 34 ein gegenüber der Umgebung größerer Druck bzw. soll Schmieröl ausgestoßen werden, dann hebt der Dichtkörper 48 in der Aussparung 52 des entsprechenden Auslassventils 40 bzw. 42 vom Dichtsitz ab, was in der Figur 4 dargestellt ist. Aufgrund der elastischen Ausgestaltung des Dichtkörpers 48 hebt dieser aber nur in dem engen Bereich innerhalb der Aussparung 52 ab, in dem er vom Innendruck angehoben wird. In den benachbarten Bereichen liegt der Dichtkörper 48 nach wie vor am Dichtsitz an. Hierdurch wird verhindert, dass Luft in den Arbeitsraum 30 einströmt. Außerdem ist erkennbar, dass der Dichtkörper 48 auf jeden Fall am vorderen und um hinteren Ende der Aussparung 52 auf den Dichtsitz gedrückt wird und dass das Auslassventil nach radial innen öffnet.If in the pressure chamber 34 a pressure greater than that of the surroundings or if lubricating oil is to be ejected, the sealing body 48 in the recess 52 of the corresponding outlet valve 40 or 42 lifts off from the sealing seat, which is illustrated in FIG. Due to the elastic configuration of the sealing body 48, however, this lifts only in the narrow area within the recess 52, in which it is lifted by the internal pressure. In the adjacent areas of the sealing body 48 is still at the sealing seat. This prevents air from flowing into the working space 30. In addition, it can be seen that the sealing body 48 is pressed in any case at the front and at the rear end of the recess 52 on the sealing seat and that the exhaust valve opens radially inward.
Die Figur 5 zeigt einen Schnitt V - V gemäß Figur 2 mit offenem Auslassventil 40, d.h. in der Aussparung 52 angehobenem Dichtkörper 48. Bei dieser Variante ist erkennbar, dass die Luftauslassöffnung 38 in der Innenumfangsflache 22 des Gehäuses 12 abgeordnet ist. FIG. 5 shows a section V - V according to FIG. 2 with open outlet valve 40, ie. In this variant, it can be seen that the air outlet opening 38 is seconded in the inner peripheral surface 22 of the housing 12 in the recess 52.

Claims

Patentansprüche claims
1. Vakuumpumpe (10) mit einem topfförmigen Gehäuse (12), einem exzentrisch im Gehäuse (12) drehbar gelagerten Rotor (18), einem im Rotor (18) orthogonal zur DrehachseA vacuum pump (10) having a pot-shaped housing (12), a rotor (18) rotatably mounted eccentrically in the housing (12), one in the rotor (18) orthogonal to the axis of rotation
(21) verschieblich gelagerten Flügel (20), der mit wenigstens einer seiner Flügelspitzen an einer einen Arbeitsraum (30) begrenzenden Innenumfangsflache (22) des Gehäuses (12) anliegt und dabei den Arbeitsraum (30) in einen Saugraum (32) und einen Druckraum (34) unterteilt und der Saugraum (32) mit einer Lufteinlassöffnung (14) und der Druckraum (34) mit einer Luftauslassöffnung (38) versehen sind, wobei die Luftauslassöffnung (38) mit einem Auslassventil (40) versehen ist, und das Auslassventil (40) einen direkt auf der Luftauslassöffnung (38) aufliegenden Dichtkörper (48) aufweist, dadurch gekennzeichnet, dass der Dichtkörper(21) slidably mounted wing (20) which rests with at least one of its wing tips on a working space (30) defining inner peripheral surface (22) of the housing (12) while the working space (30) in a suction chamber (32) and a pressure chamber (34) and the suction space (32) having an air inlet opening (14) and the pressure chamber (34) having an air outlet opening (38) are provided, wherein the air outlet opening (38) is provided with an outlet valve (40), and the outlet valve ( 40) has a directly on the air outlet (38) resting sealing body (48), characterized in that the sealing body
(48) am in Drehrichtung (36) des Rotors (18) vorderen und hinteren Ende der Luftauslassöffnung (38) an dieser befestigt ist und permanent an dieser anliegt.(48) in the direction of rotation (36) of the rotor (18) front and rear end of the air outlet opening (38) is fixed thereto and permanently applied to this.
2. Vakuumpumpe nach Anspruch 1, dadurch gekennzeichnet, dass der Dichtkörper (48) elastisch, insbesondere gummielastisch ist.2. Vacuum pump according to claim 1, characterized in that the sealing body (48) is elastic, in particular rubber-elastic.
3. Vakuumpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Material des Dichtkörpers (48) dehnbar ist.3. Vacuum pump according to one of the preceding claims, characterized in that the material of the sealing body (48) is stretchable.
4. Vakuumpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Auslassventil (40) in Umfangsrichtung gebogen, insbesondere C- oder nierenförmig, ausgebildet ist.4. Vacuum pump according to one of the preceding claims, characterized in that the outlet valve (40) bent in the circumferential direction, in particular C- or kidney-shaped, is formed.
5. Vakuumpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtkörper (48) an der vom Druckraum (34) abgewandten Seite der Luftauslassöffnung (38) anliegt.5. Vacuum pump according to one of the preceding claims, characterized in that the sealing body (48) on the from the pressure chamber (34) facing away from the air outlet opening (38).
6. Vakuumpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Auslassventil (40) einen den Dichtkörper (48) übergreifenden Stützkörper (50) aufweist .6. Vacuum pump according to one of the preceding claims, characterized in that the outlet valve (40) has a sealing body (48) cross-supporting body (50).
7. Vakuumpumpe nach Anspruch 6, dadurch gekennzeichnet, dass der Stützkörper (50) in den Bereichen am Dichtkörper (48) anliegt, in denen der Dichtkörper (48) am Gehäuse (12) anliegt .7. Vacuum pump according to claim 6, characterized in that the supporting body (50) rests in the areas on the sealing body (48), in which the sealing body (48) rests against the housing (12).
8. Vakuumpumpe nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Stützkörper (50) im Bereich der Luftauslassöffnung (38) einen Abstand zum Dichtkörper (48) aufweist .8. Vacuum pump according to claim 6 or 7, characterized in that the supporting body (50) in the region of the air outlet opening (38) has a distance from the sealing body (48).
9. Vakuumpumpe nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass der Dichtkörper (48) zwischen dem Gehäuse (12) und dem Stützkörper (50) angeordnet, insbesondere fest eingespannt ist.9. Vacuum pump according to one of claims 6 to 8, characterized in that the sealing body (48) between the housing (12) and the support body (50) arranged, in particular firmly clamped.
10. Vakuumpumpe nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der Dichtkörper (48) auf den Stützkörper (50) aufvulkanisiert ist.10. Vacuum pump according to one of claims 6 to 9, characterized in that the sealing body (48) is vulcanized onto the support body (50).
11. Vakuumpumpe nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass der Stützkörper (50) im Bereich der Luftauslassöffnung (38) randoffen ausgespart ist und der Dichtkörper (48) an den Rand der Aussparungen (52) anvulkanisiert ist.11. Vacuum pump according to one of claims 6 to 10, characterized in that the supporting body (50) in the region of the air outlet opening (38) is recessed open edge and the sealing body (48) is vulcanized to the edge of the recesses (52).
12. Vakuumpumpe nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Stützkörper (50) und der Dichtkörper (48) als einteiliger Ventilkörper (44) ausgebildet sind.12. Vacuum pump according to claim 6 or 7, characterized in that the supporting body (50) and the sealing body (48) are formed as a one-piece valve body (44).
13. Vakuumpumpe nach Anspruch 12, dadurch gekennzeichnet, dass der Ventilkörper (44) im Bereich der Luftauslassöff- nung (38) zur Ausbildung des Dichtkörpers (48) eine geringere Materialdicke aufweist als in den angrenzenden Bereichen.13. Vacuum pump according to claim 12, characterized in that the valve body (44) in the region of the Luftauslassöff- tion (38) for forming the sealing body (48) has a smaller material thickness than in the adjacent areas.
14. Vakuumpumpe nach Anspruch 13, dadurch gekennzeichnet, dass die Materialdicke derart gering ist, dass der Bereich elastisch verformbar ist.14. Vacuum pump according to claim 13, characterized in that the material thickness is so small that the region is elastically deformable.
15. Vakuumpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Auslassventil (40) nach radial innen öffnet.15. Vacuum pump according to one of the preceding claims, characterized in that the outlet valve (40) opens radially inward.
16. Vakuumpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtkörper (50) aus Kunststoff, insbesondere einem Thermoplast oder Elastomer, besteht. 16. Vacuum pump according to one of the preceding claims, characterized in that the sealing body (50) made of plastic, in particular a thermoplastic or elastomer.
EP07856378A 2007-01-04 2007-12-05 Vacuum pump having an outlet valve Withdrawn EP2079932A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202007003155 2007-01-04
DE102007010729A DE102007010729B3 (en) 2007-01-04 2007-02-26 Vacuum pump for use in engine of motor vehicle, has sealing body flexibly designed and fixed at air discharge opening at front and rear ends of opening in rotation direction of rotor, where body lies permanently at opening
PCT/EP2007/010543 WO2008080492A1 (en) 2007-01-04 2007-12-05 Vacuum pump having an outlet valve

Publications (1)

Publication Number Publication Date
EP2079932A1 true EP2079932A1 (en) 2009-07-22

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EP (1) EP2079932A1 (en)
DE (1) DE102007010729B3 (en)
WO (1) WO2008080492A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102009038132B4 (en) * 2009-08-12 2015-12-24 Joma-Polytec Gmbh vacuum pump
DE102013104375A1 (en) * 2013-04-30 2014-10-30 Hella Kgaa Hueck & Co. vacuum pump
CN108138778B (en) * 2015-11-02 2020-03-31 皮尔伯格泵技术有限责任公司 Vacuum pump for motor vehicle
JP6534647B2 (en) 2016-11-03 2019-06-26 大豊工業株式会社 Vane pump
JP6613222B2 (en) * 2016-11-03 2019-11-27 大豊工業株式会社 Vane pump

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US1667143A (en) * 1927-07-11 1928-04-24 Wayne Co Discharge valve for ice-machine compressors
JPS555428A (en) * 1978-06-22 1980-01-16 Nakamura Suikan:Kk Water ring pump of side-air-port type
DE8518157U1 (en) * 1985-06-22 1986-10-16 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Vane vacuum pump
DE4019854B4 (en) * 1989-07-10 2004-09-16 Saurer Gmbh & Co. Kg Vane vacuum pump
EP1563190A2 (en) * 2002-11-13 2005-08-17 LuK Automobiltechnik GmbH & Co. KG Vacuum pump
EP1646790B1 (en) * 2003-07-23 2016-10-19 Hargraves Technology Corporation Pump valve with controlled stroke

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