EP2122176B1 - Vacuum pump - Google Patents
Vacuum pump Download PDFInfo
- Publication number
- EP2122176B1 EP2122176B1 EP08701036A EP08701036A EP2122176B1 EP 2122176 B1 EP2122176 B1 EP 2122176B1 EP 08701036 A EP08701036 A EP 08701036A EP 08701036 A EP08701036 A EP 08701036A EP 2122176 B1 EP2122176 B1 EP 2122176B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leaf spring
- vacuum pump
- housing
- spring
- blade
- 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
Links
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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
- 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 outlet valve has a leaf spring which does not consist, as in the prior art, of a leaf spring having a constant spring constant. Rather, the leaf spring according to the invention has a starting from the clamping point changing spring constant. This means that the free end of the leaf spring can be lifted off the outlet opening with a relatively small force, whereas for the further lifting of the leaf spring the force required for this increases disproportionately. As a result, the advantage is achieved that only the portion of the leaf spring is lifted from the outlet opening, which is required for the outlet of the compressed fluid. Too much opening of the exhaust valve is due to the clamping of the Leaf spring towards growing force required to lift the leaf spring effectively prevented.
- the leaf spring is a layered leaf spring.
- a layered leaf spring two or more sheets are stacked with the leaves having stepped lengths. The leaves are attached to the clamping point and extend, with different lengths, different distances away from this. As a result, the rigidity of the free end of the leaf spring is selectively increased in the direction of the clamping point. In addition, the friction between the blades can be used to control the opening of the valve.
- a variant according to the invention provides that the thickness of the individual sheets is equal or unequal. Especially with uneven thick leaves, the thickness can be greater for shorter leaves.
- the leaf spring made of metal or plastic.
- this can also be composed of a combination of plastic and metal leaves.
- the long leaves are made of plastic, whereas the short leaves are made of metal.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Die Erfindung betrifft eine Vakuumpumpe mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a vacuum pump with the features of the preamble of claim 1.
Vakuumpumpen mit einem derartigen Aufbau sind zum Beispiel aus der
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
Der Erfindung liegt 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 has for its object to provide a vacuum pump, wherein it is ensured that the compressed air in the pressure chamber is completely discharged into the pressure line and is not transferred to the located behind the wing pressure chamber.
Diese Aufgabe wird mit einer Vakuumpumpe der gelöst, die die Merkmale des Anspruchs 1 aufweist.This object is achieved with a vacuum pump, which has the features of claim 1.
Bei der erfindungsgemäßen Vakuumpumpe weist das Auslassventil eine Blattfeder auf, die nicht, wie beim Stand der Technik, aus einer eine konstante Federkonstante aufweisenden Blattfeder besteht. Vielmehr besitzt die erfindungsgemäße Blattfeder eine von der Einspannstelle ausgehend sich ändernden Federkonstante. Dies bedeutet, dass das freie Ende der Blattfeder mit einer relativ kleinen Kraft von der Auslassöffnung abgehoben werden kann, wohingegen für das weitere Abheben der Blattfeder die hierfür erforderliche Kraft überproportional zunimmt. Hierdurch wird der Vorteil erreicht, dass lediglich der Bereich der Blattfeder von der Auslassöffnung abgehoben wird, der für den Auslass des komprimierten Fluids erforderlich ist. Ein zu großes Öffnen des Auslassventils wird durch die zur Einspannstelle der Blattfeder hin wachsende erforderliche Kraft zum Abheben der Blattfeder wirksam verhindert.In the case of the vacuum pump according to the invention, the outlet valve has a leaf spring which does not consist, as in the prior art, of a leaf spring having a constant spring constant. Rather, the leaf spring according to the invention has a starting from the clamping point changing spring constant. This means that the free end of the leaf spring can be lifted off the outlet opening with a relatively small force, whereas for the further lifting of the leaf spring the force required for this increases disproportionately. As a result, the advantage is achieved that only the portion of the leaf spring is lifted from the outlet opening, which is required for the outlet of the compressed fluid. Too much opening of the exhaust valve is due to the clamping of the Leaf spring towards growing force required to lift the leaf spring effectively prevented.
Dabei ist die Blattfeder eine geschichtete Blattfeder. Bei einer geschichteten Blattfeder liegen zwei oder mehrere Blätter übereinander, wobei die Blätter abgestufte Längen aufweisen. Die Blätter sind an der Einspannstelle befestigt und erstrecken sich, bei unterschiedlichen Längen, unterschiedlich weit von dieser weg. Hierdurch wird gezielt die Steifigkeit vom freien Ende der Blattfeder in Richtung zu der Einspannstelle erhöht. Außerdem kann die Reibung zwischen den Blättern zur Steuerung der Öffnung des Ventils verwendet werden.The leaf spring is a layered leaf spring. In a layered leaf spring, two or more sheets are stacked with the leaves having stepped lengths. The leaves are attached to the clamping point and extend, with different lengths, different distances away from this. As a result, the rigidity of the free end of the leaf spring is selectively increased in the direction of the clamping point. In addition, the friction between the blades can be used to control the opening of the valve.
Die erfindungsgemäße Blattfeder sieht vor, dass die Blätter mit abnehmender Länge gesprengt sind. Dies bedeutet, dass die Blätter in Richtung des jeweils längeren Blattes gekrümmt sind. Auch durch diese Maßnahme wird die Steifigkeit der Blattfeder in Richtung der Einspannstelle erhöht.The leaf spring according to the invention provides that the leaves are blasted with decreasing length. This means that the leaves are curved in the direction of the longer leaf. Also by this measure, the rigidity of the leaf spring is increased in the direction of the clamping point.
Weiterhin ist die Blattfeder in der Abdichtebene teilkreisförmig oder nierenförmig gebogen. Dies ist insbesondere dann der Fall, wenn die Auslassöffnung sich im Boden des Gehäuses befindet. Befindet sich die Auslassöffnung in der Umfangswand des Gehäuses, dann sind die oben erwähnten Maßnahmen jeweils bezüglich der Krümmung der Umfangswand angepasst. Dies bedeutet, dass die Blattfeder von vornherein die Krümmung der Umfangswand beziehungsweise der Auslassöffnung aufweist.Furthermore, the leaf spring is bent part-circular or kidney-shaped in the sealing plane. This is especially the case when the outlet opening is located in the bottom of the housing. If the outlet opening is located in the peripheral wall of the housing, then the above-mentioned measures are respectively adapted with regard to the curvature of the peripheral wall. This means that the leaf spring from the outset has the curvature of the peripheral wall or the outlet opening.
Eine weitere Änderung der Federkennlinie beziehungsweise der Federkonstanten kann erfindungsgemäß zum Beispiel dadurch erfolgen, dass die Blattfeder über ihre Länge sich ändernde Federeigenschaften aufweist, was zum Beispiel durch eine gezielte Härtung unterschiedlicher Bereiche der Blattfeder erfolgen kann.According to the invention, a further change in the spring characteristic or the spring constant can take place, for example, by virtue of the fact that the leaf spring has changing spring properties along its length, which can be achieved, for example, by targeted hardening of different regions of the leaf spring.
Bei einer erfindungsgemäßen Weiterbildung ist die Blattfeder als Rechteckfeder, Dreieckfeder oder Trapezfeder ausgebildet. Bereits durch die Form der Feder kann gezielt auf deren Steifigkeit eingewirkt werden. Zu beachten ist lediglich, dass die Auslassöffnung von der Blattfeder vollständig abgedeckt wird.In a further development of the invention, the leaf spring is designed as a rectangular spring, triangular spring or trapezoidal spring. Already by the shape of the spring can be specifically acted on the stiffness. It should only be noted that the outlet opening is completely covered by the leaf spring.
Bei einer erfindungsgemäßen Weiterbildung ist vorgesehen, dass die Blattfeder eine Konstante oder eine von der Einspannstelle ausgehend abnehmende Dicke aufweist. Dabei kann sich die Dicke der Blattfeder kontinuierlich, bevorzugt aber in Stufen, ändern. Die Herstellung erfolgt zum Beispiel durch abgestuftes Walzen der einzelnen Blätter.In a development according to the invention, it is provided that the leaf spring has a constant or a thickness which decreases starting from the clamping point. In this case, the thickness of the leaf spring can change continuously, but preferably in stages. The production takes place, for example, by gradual rolling of the individual sheets.
Eine erfindungsgemäße Variante sieht vor, dass die Dicke der einzelnen Blätter gleich oder ungleich ist. Insbesondere bei ungleich dicken Blättern kann die Dicke bei kürzeren Blättern größer sein.A variant according to the invention provides that the thickness of the individual sheets is equal or unequal. Especially with uneven thick leaves, the thickness can be greater for shorter leaves.
Bevorzugt besteht die Blattfeder aus Metall oder Kunststoff. Bei geschichteten Blattfedern kann diese auch aus einer Kombination von aus Kunststoff und aus Metall bestehenden Blättern aufgebaut sein. Insbesondere bestehen die langen Blätter aus Kunststoff, wohingegen die kurzen Blätter aus Metall bestehen.Preferably, the leaf spring made of metal or plastic. In layered leaf springs this can also be composed of a combination of plastic and metal leaves. In particular, the long leaves are made of plastic, whereas the short leaves are made of metal.
Bei einem Ausführungsbeispiel befindet sich das Auslassventil mit der Blattfeder sich im Boden oder der Umfangswand des Gehäuses.In one embodiment, the outlet valve with the leaf spring located in the bottom or the peripheral wall of the housing.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein besonders bevorzugtes Ausführungsbeispiel im Einzelnen beschrieben ist. Dabei können die in der Zeichnung dargestellten 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 a particularly preferred embodiment is described in detail with reference to the drawing. In this case, those shown in the drawing and in the claims and in the description mentioned features each individually by itself or in any combination essential to the invention.
In der Zeichnung zeigen:
- Figur 1
- eine Vakuumpumpe mit abgenommenem Gehäusedeckel;
- Figur 2
- die Rückseite der Vakuumpumpe, den Antrieb des Rotors sowie das Auslassventil zeigend;
- Figur 3
- eine vergrößerte Darstellung des Auslassventils vor dem Zusammenbau; und
- Figur 4
- das Auslassventil gemäß
Figur 3 in zusammengebauter Stellung.
- FIG. 1
- a vacuum pump with the housing cover removed;
- FIG. 2
- showing the back of the vacuum pump, the drive of the rotor and the exhaust valve;
- FIG. 3
- an enlarged view of the exhaust valve before assembly; and
- FIG. 4
- the exhaust valve according to
FIG. 3 in assembled position.
In der
In der
Aus der
Das Blatt 52 ist der Auslassöffnung 38 unmittelbar benachbart und liegt auf dieser auf und verschließt sie. Das Blatt 52 wird vom Blatt 54 hintergriffen, welches an der gegenüberliegenden Seite anliegt. Jedoch besitzt das Blatt 54 eine geringere Länge, so dass das Blatt 52 das Blatt 54 über eine gewisse Wegstrecke überragt. Die Blätter 56 und 58 sind entsprechend aufgebaut und hintergreifen das Blatt 54 beziehungsweise das Blatt 56.The
Dies hat zur Folge, dass zum Anheben des freien Endes 62 des Blatts 52 lediglich eine geringe Druckkraft in Richtung des Pfeils 64 erforderlich ist. Bei großem Volumenstrom wird zusätzlich zum freien Ende 62 des Blatts 52 auch das freie Ende des Blatts 54 und eventuell das freie Ende des Blatts 56 angehoben. Um die Blätter 54, 56 und 58 nacheinander anzuheben, muss die in Richtung des Pfeils 64 wirkende Druckkraft jedoch stark überproportional zunehmen. Hierdurch wird erreicht, dass lediglich das äußerste freie Ende 62 von der Auslassöffnung 38 abgehoben wird und die restliche Fläche der Auslassöffnung 38 weiterhin von der Blattfeder 44 verdeckt wird. Hierdurch wird verhindert, dass Luft aus dem Druckraum 34 vor dem Flügel 20 in den Saugraum 32 hinter den Flügel 20 überströmt.This has the consequence that only a small pressure force in the direction of the
Aus den
Die
Mit der erfindungsgemäßen Vakuumpumpe 10 wird eine Rückströmung von komprimiertem Fluid in den Saugraum 32 effektiv vermindert.With the
Claims (6)
- Vacuum pump (10) with a pot-shaped housing (12), a rotor (18) that is pivoted eccentrically in the housing (12), a blade (20) which is held in the rotor (18) such that it can be displaced orthogonally to the axis of rotation (21), and which rests with its blade tips against an inner circumferential surface (22) of the housing (12) that delimits a work area (30) and, in so doing, divides the work area (30) into a inlet chamber (32) and a pressure chamber (34), and the inlet chamber (32) is equipped with an air inlet opening (14) and the pressure chamber (34) is equipped with an air outlet opening (38), wherein the air outlet opening (38) is equipped with an outlet valve (40) and the outlet valve (40) as the closing element (46) has a leaf spring (44) that is fixed in on one side, wherein the spring characteristic of the leaf spring (44) changes from the point of fixation (50) in the direction of the free end (62), with the leaf spring (44) being curved in an arc shape or a kidney shape in the sealing area, characterised in that the leaf spring (44) is a laminate leaf spring (44) with individual leaves (52, 54, 56, 58), wherein the leaves (52, 54, 56, 58) have graduated lengths, and is curved in the direction of the respectively longer leaf (52, 54, 56).
- Vacuum pump according to claim 1, characterised in that the leaf spring (44) is a rectangular, triangular or trapezoid spring.
- Vacuum pump according to one of the preceding claims, characterised in that the leaf spring (44) has a constant thickness, or a thickness that decreases starting from the point of fixation (50).
- Vacuum pump according to one of the preceding claims, characterised in that the thickness of the individual leaves (52, 54, 56, 58) is the same or unequal.
- Vacuum pump according to one of the preceding claims, characterised in that the leaf spring (44) comprises metal or plastic or a combination.
- Vacuum pump according to one of the preceding claims, characterised in that the outlet valve (40) with the leaf spring (44) is located in the base (26) or peripheral wall (22) of the housing (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007018247A DE102007018247A1 (en) | 2007-04-12 | 2007-04-12 | vacuum pump |
PCT/EP2008/000103 WO2008125155A1 (en) | 2007-04-12 | 2008-01-09 | Vacuum pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2122176A1 EP2122176A1 (en) | 2009-11-25 |
EP2122176B1 true EP2122176B1 (en) | 2011-09-14 |
Family
ID=39204763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08701036A Active EP2122176B1 (en) | 2007-04-12 | 2008-01-09 | Vacuum pump |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2122176B1 (en) |
AT (1) | ATE524655T1 (en) |
DE (1) | DE102007018247A1 (en) |
WO (1) | WO2008125155A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009016048B4 (en) * | 2009-04-02 | 2018-05-30 | Bayerische Motoren Werke Aktiengesellschaft | Pump for a motor vehicle internal combustion engine and motor vehicle internal combustion engine with pump |
WO2010145633A2 (en) * | 2009-06-17 | 2010-12-23 | Ixetic Hückeswagen Gmbh | Vacuum pump |
DE102010026032A1 (en) * | 2010-07-03 | 2012-01-05 | Mahle International Gmbh | Flatter valve i.e. non-return valve, for use in rotary vane pump in brake booster in motor car, has blank holder whose form corresponds to bending line of single-sided clamped bending bar, which is designed as cantilever arm |
DE102013104375A1 (en) * | 2013-04-30 | 2014-10-30 | Hella Kgaa Hueck & Co. | vacuum pump |
DE102015118022A1 (en) * | 2015-10-22 | 2017-04-27 | Pfeiffer Vacuum Gmbh | Rotationsverdrängervakuumpumpe |
DE102016210102A1 (en) * | 2016-06-08 | 2017-12-14 | Mahle International Gmbh | Check valve for a vacuum pump |
DE102017123695A1 (en) * | 2017-10-11 | 2019-04-11 | Schwäbische Hüttenwerke Automotive GmbH | rotary pump |
CN112901483A (en) * | 2021-04-05 | 2021-06-04 | 杨文通 | Cylinder block and pump/motor/air compressor/internal combustion engine using same |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US939549A (en) * | 1909-06-03 | 1909-11-09 | Frederick C Reineking | Reed air-intake regulator for carbureters. |
US2689552A (en) * | 1950-09-11 | 1954-09-21 | Elmer C Kiekhaefer | Reed valve for internal-combustion engines |
JPS608577A (en) * | 1983-06-29 | 1985-01-17 | Hitachi Ltd | Construction of delivery valve for compressor |
DE4019854B4 (en) | 1989-07-10 | 2004-09-16 | Saurer Gmbh & Co. Kg | Vane vacuum pump |
US5421368A (en) * | 1994-09-02 | 1995-06-06 | Carrier Corporation | Reed valve with tapered leg and dual radius valve stop |
EP1563190A2 (en) * | 2002-11-13 | 2005-08-17 | LuK Automobiltechnik GmbH & Co. KG | Vacuum pump |
DE102004034926B3 (en) | 2004-07-09 | 2005-12-29 | Joma-Hydromechanic Gmbh | A single-blade |
-
2007
- 2007-04-12 DE DE102007018247A patent/DE102007018247A1/en not_active Withdrawn
-
2008
- 2008-01-09 AT AT08701036T patent/ATE524655T1/en active
- 2008-01-09 WO PCT/EP2008/000103 patent/WO2008125155A1/en active Search and Examination
- 2008-01-09 EP EP08701036A patent/EP2122176B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2122176A1 (en) | 2009-11-25 |
WO2008125155A1 (en) | 2008-10-23 |
DE102007018247A1 (en) | 2008-10-16 |
ATE524655T1 (en) | 2011-09-15 |
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