EP3583319B1 - Multi-stage rotary lobe pump - Google Patents
Multi-stage rotary lobe pump Download PDFInfo
- Publication number
- EP3583319B1 EP3583319B1 EP18701730.6A EP18701730A EP3583319B1 EP 3583319 B1 EP3583319 B1 EP 3583319B1 EP 18701730 A EP18701730 A EP 18701730A EP 3583319 B1 EP3583319 B1 EP 3583319B1
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- EP
- European Patent Office
- Prior art keywords
- pump
- chamber
- pump according
- multistage roots
- inflow
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- 238000005192 partition Methods 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- 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
- F04C18/126—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 radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
Definitions
- the invention relates to a multi-stage Roots pump.
- Roots pumps for example, have two-toothed rotary pistons arranged in a pump chamber.
- the two rotary pistons provided for each pump chamber are driven in opposite directions, so that gas is sucked in through a main inlet through the individual chambers created and expelled again through a main outlet.
- the main inlet and the main outlet run in a radial direction and are arranged opposite one another.
- Rotary pistons with multiple teeth in particular those with three or four teeth, are also known.
- the gas is pumped essentially radially from a radially arranged main inlet to a radially arranged main outlet.
- Multi-stage Roots pumps are also known for achieving low pressures.
- Each stage of such Roots pumps has a pair of rotary pistons.
- the gas to be pumped is conveyed from the outlet of one pump stage to the inlet of an adjacent pump stage. This takes place via connecting channels.
- the connecting channels can, for example, be US2010/0158728 described, be arranged in the housing of the Roots pump, whereby the connecting channels surround the pump chambers in which the rotary pistons are arranged or are arranged radially outside the pump chambers. This is necessary in order to transfer gas from a Outlet of one pump stage to an inlet of the adjacent pump stage located in the opposite area, for example the upper area of a Roots pump.
- Roots pumps of this type have the disadvantage that the design of the channels in the housing is technically complex. Furthermore, the housing must be designed to be large in order to accommodate the connecting channels. This not only leads to large external dimensions of the Roots pump but also to high costs. The high costs are caused not only by the complex manufacturing process but also by the large amount of metal used.
- WO 2013/023954 Multi-stage Roots pumps are known in which the Roots have three or more teeth.
- the connecting channels between adjacent pump chambers are arranged in the partition walls that separate adjacent pump chambers from one another. Due to the provision of three or more teeth per rotary piston, it is possible for the connecting channels to be arranged exclusively axially in the partition walls. Since such an axial arrangement of connecting channels is only possible with rotary piston pumps with three or more teeth, such a pump has the disadvantage that the suction capacity is lower than with Roots pumps with two teeth rotary pistons.
- Roots pump with trident rotary pistons is from US2005/0089424 known. It is a multi-stage Roots pump, with the individual pump stages being separated from one another by partition walls. The connecting channels between the pump stages are arranged in the partition walls. The connecting channels are Z-shaped. The connecting channels therefore have an inlet area, a radially extending connecting area and an axially extending outlet area. This leads to high flow losses.
- JPS6319090U discloses a multi-stage Roots pump according to the preamble of claim 1.
- the object of the invention is to create a multi-stage Roots pump with which high suction capacities can be achieved.
- the multi-stage Roots pump according to the invention has several pump chambers formed in a pump housing.
- two two-toothed rotary pistons are arranged to form a pump stage.
- Adjacent pump stages are separated from one another by partition walls.
- Connecting channels are arranged in the partition walls to connect the adjacent pump stages to one another.
- the connecting channels are designed in such a way that at least one, preferably all, connecting channels are connected to an axial inflow space in which the pumped medium flows from the pump chamber of a pump stage through an inflow opening into the inflow space.
- the inflow opening is designed in such a way that the cross section of the inflow opening is larger than the cross section of the connecting chamber.
- the multi-stage Roots pump with two-toothed rotary pistons By designing the multi-stage Roots pump with two-toothed rotary pistons according to the invention, a high suction capacity can be achieved. By providing an inflow space with a large inflow opening, the flow resistance can be reduced even in the case of connecting channels arranged within the partition walls and thus shortened. This reduces the required power consumption of the pump and increases the suction capacity and thus the efficiency of the pump.
- the connecting channel between two pump stages is arranged essentially, in particular exclusively, radially and runs completely in the intermediate wall.
- the connecting channel thus has at least one, in particular exclusively radially extending channel section. It is particularly preferred that the entire connecting channel is arranged radially, the connecting channel being preferably directly connected in particular to an axial inflow space arranged upstream in the direction of flow. It is particularly preferred that an axial outflow space is additionally provided, which is preferably also directly connected to the radially extending connecting channel. The outflow space is then connected to the next pump stage via an outflow opening, the outflow opening of the connecting channel forming the inlet of the next pump stage.
- the inflow opening of the inflow space has a larger cross-section than the radial channel section of the connecting channel and in particular than the essentially exclusively radially extending connecting channel. It is particularly preferred that the cross-section of the inflow opening is at least 10%, in particular at least 20% and particularly preferably at least 30% larger than the cross-section of the connecting channel.
- edges at the inflow opening are rounded off with radii to improve flow.
- the radius of the rounding is preferably greater than two millimeters.
- an antechamber is arranged in front of the inflow chamber in the direction of flow.
- the medium to be tested thus initially reaches at least partially an antechamber before it is then passed on to the inflow chamber.
- the arrangement of the antechamber and the inflow chamber can be designed in such a way that the medium can also reach the inflow chamber directly from the pump chamber. This design reduces the Flow resistance is further reduced.
- the provision of an anteroom represents an independent invention, independent of the cross-section of the inlet opening.
- the antechamber is arranged radially to the rotary piston pair. This has the advantage that the medium to be pumped does not have to be diverted when flowing into the antechamber. It is therefore particularly preferred that the antechamber forms a part of the pump chamber into which the rotary pistons do not protrude.
- the antechamber particularly preferably extends over the entire width of the pump chamber, so that the medium can flow into the antechamber without flow resistance.
- the connecting channels arranged in the partition walls are additionally connected to an outflow space.
- the connection is made directly, with the connecting channel preferably being arranged exclusively radially within the partition walls.
- the outflow space preferably has an outflow opening.
- the cross section of the outflow opening is preferably designed such that it is larger than the cross section of the connecting channel.
- the cross section of the outflow opening is preferably 10%, in particular 20% and particularly preferably 30% larger than the cross section of the connecting channel.
- the edges in this area are also preferably rounded as in the area of the inflow space.
- an additional after-chamber is provided. This is located downstream of the outflow chamber in the direction of flow.
- the after-chamber can be arranged and designed in such a way that the medium from the outflow chamber flows through the outflow opening completely or only partially into the after-chamber. The medium can thus flow into the subsequent pumping stage, possibly partially directly from the outflow opening or else flow completely or partially into the after-chamber in order to then flow from there into the next pump chamber.
- the after-chamber is preferably designed in the same way as the anteroom.
- the after-chamber is preferably arranged radially to the rotary piston pair. It is again preferred here that the rotary pistons do not protrude into the anteroom and that the anteroom extends in particular over the entire width of the pump stage.
- the housing has at least one inlet cover.
- the at least one inlet cover forms a side wall of the inflow chamber, in particular completely.
- the inflow chamber is easily accessible, for example for cleaning.
- the geometry is simplified and production is therefore easier.
- an additional inlet cover is provided, for example, which forms a side wall of the anteroom.
- This side cover is also preferably designed in such a way that it completely forms the wall, so that the anteroom is easily accessible, for example for cleaning. This in turn simplifies the geometry and thus enables more cost-effective production.
- the pump chamber is also easily accessible via the inlet cover of the anteroom.
- a side cover forms a side wall of both the inflow chamber and the anteroom.
- the inlet cover extends over at least two adjacent pump stages and particularly preferably over all pump stages of the multi-stage Roots pump.
- the housing has at least one outlet cover which forms a side wall of the outflow chamber.
- the outlet cover is preferably further developed in accordance with the inlet cover, wherein in particular an outlet cover is also provided for an after-chamber and in a particularly preferred embodiment the outlet cover extends over one or more pump stages, in particular all pump stages.
- Each pump stage of the multi-stage Roots pump according to the invention has a pair of Roots.
- the pair of Roots comprises two two-toothed rotary pistons 10. These are each arranged on a shaft 12 and are rotated in opposite directions to convey the medium.
- the individual Roots of the pump stages arranged one behind the other are each arranged on a common shaft, so that the Roots pump has two shafts 12.
- the Roots 10 of each pair of Roots are arranged in a pump chamber 14 forming a pump stage.
- the pump chamber is separated by a two-part housing 16, 18
- a housing separation 20 is provided in the middle of the two shafts 12 so that easy assembly is possible.
- the housing is provided with an inlet cover 22 and an outlet cover 24.
- the Roots pump according to the invention is designed as a multi-stage Roots pump, with several pump stages 26, 28, 30, 32, 34 being provided in the axial direction.
- the chamber volumes of the individual pump stages decrease, starting from the pump stage 26 in the direction of the pump stage 34.
- the first pump stage 26 is connected to a main inlet 36.
- the main inlet 36 is connected to a chamber to be evacuated or the like. The medium to be pumped thus flows radially through the main inlet 36 into the pump chamber 14 of the first pump stage 36.
- an antechamber 38 is formed in the radial direction, opposite the main inlet 36.
- the antechamber 38 extends over the entire axial width of the pump stage 26 and thus has essentially the same width as the roots 10 of the first pump stage 36.
- an inflow chamber 40 is provided.
- the inflow chamber 40 adjoins the anteroom 38 on the one hand and furthermore has an inflow opening 42 which, in the illustrated embodiment, has a direct connection to the pump chamber 14.
- the inflow chamber 40 is connected to a connecting channel 48 arranged within an intermediate wall 44.
- the medium to be conveyed flows into Fig.2 in the connecting channel 48 from bottom to top.
- the connecting channel 48 which in the illustrated embodiment runs exclusively radially, is followed by a Outflow chamber 50 and, adjacent to this, a post-chamber 52 designed to correspond to the pre-chamber 38.
- the outflow chamber 50 has an outflow opening 54, which in the illustrated embodiment corresponds to the contour and design of the inflow opening 42.
- all pump stages are constructed accordingly, with the pump stages being separated from one another by partition walls 44 and a connecting channel 48, which runs radially in the embodiment shown, being arranged in each partition wall 44.
- Each connecting channel 48 is connected to an inflow chamber 40 and an outflow chamber 50 as well as an anteroom 38 and a postroom 52.
- the inlet openings 42 of the inflow spaces 40 and preferably also the outlet openings 54 of the outflow spaces 50 are designed such that they have a larger cross-section than the connecting channels 48.
- both the inflow spaces 40 and the anterooms 38 are connected to a common inlet cover 24. Accordingly, the outflow spaces 50 and the postrooms 52 are also connected to a common outlet cover 22.
- the last pump stage 34 is further connected to a main outlet (not shown) through which the medium to be pumped is discharged.
- Fig.3 is shown as a schematic plan view of an inlet chamber 40, which is connected on the one hand to an anteroom 38 and on the other hand to a connecting channel 48.
- the inlet opening 42 is formed by the edge 54, which is curved in the embodiment shown.
- the inlet opening thus has the cross section shown by the dashed line 56.
- the inflow chamber 40 is directly connected to the corresponding pump chamber 14 on the one hand and to the antechamber 38 on the other. The same applies to the outflow opening 54.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Description
Die Erfindung betrifft eine mehrstufige Wälzkolbenpumpe.The invention relates to a multi-stage Roots pump.
Wälzkolbenpumpen weisen beispielsweise zweizähnige, in einer Pumpkammer angeordnete Drehkolben auf. Die beiden je Pumpkammer vorgesehenen Drehkolben werden gegenläufig angetrieben, so dass durch die einzelnen entstehenden Kammern Gas durch einen Haupteinlass angesaugt und über einen Hauptauslass wieder ausgestoßen wird. Der Haupteinlass sowie der Hauptauslass verlaufen hierbei in radialer Richtung und sind einander gegenüberliegend angeordnet. Ferner sind auch mehrzähnige, insbesondere drei oder vier Zähne aufweisende Drehkolben bekannt. Auch hier erfolgt ein im Wesentlichen radiales Pumpen des Gases von einem radial angeordneten Haupteinlass zu einem radial angeordneten Hauptauslass.Roots pumps, for example, have two-toothed rotary pistons arranged in a pump chamber. The two rotary pistons provided for each pump chamber are driven in opposite directions, so that gas is sucked in through a main inlet through the individual chambers created and expelled again through a main outlet. The main inlet and the main outlet run in a radial direction and are arranged opposite one another. Rotary pistons with multiple teeth, in particular those with three or four teeth, are also known. Here, too, the gas is pumped essentially radially from a radially arranged main inlet to a radially arranged main outlet.
Zur Erzielung geringer Drücke sind ferner mehrstufige Wälzkolbenpumpen bekannt. Je Stufe weisen derartige Wälzkolbenpumpen ein Drehkolbenpaar auf. Hierbei wird das zu pumpende Gas von einem Auslass einer Pumpstufe zum Einlass einer benachbarten Pumpstufe gefördert. Dies erfolgt über Verbindungskanäle. Die Verbindungskanäle können, wie beispielsweise in
Ferner sind aus
Eine weitere Wälzkolbenpumpe mit dreizähnigen Drehkolben ist aus
Aufgabe der Erfindung ist es, eine mehrstufige Wälzkolbenpumpe zu schaffen, mit der hohe Saugvermögen erzielt werden können.The object of the invention is to create a multi-stage Roots pump with which high suction capacities can be achieved.
Die Lösung der Aufgabe erfolgt erfindungsgemäß durch eine mehrstufige Wälzkolbenpumpe gemäß Anspruch 1.The object is achieved according to the invention by a multi-stage Roots pump according to claim 1.
Die erfindungsgemäße mehrstufige Wälzkolbenpumpe weist mehrere in einem Pumpengehäuse ausgebildete Pumpkammern auf. In jeder der Pumpkammern sind zur Ausbildung einer Pumpstufe zwei zweizähnige Drehkolben angeordnet. Benachbarte Pumpstufen sind durch Zwischenwände voneinander getrennt. In den Zwischenwänden sind Verbindungskanäle angeordnet, um die benachbarten Pumpstufen miteinander zu verbinden. Die Verbindungskanäle sind erfindungsgemäß hierbei derart ausgebildet, dass zumindest einer, vorzugsweise alle Verbindungskanäle mit einem axialen Einströmraum verbunden sind, in denen das geförderte Medium aus der Pumpkammer einer Pumpstufe durch eine Einströmöffnung in den Einströmraum einströmt. Erfindungsgemäß ist die Einströmöffnung hierbei derart ausgebildet, dass der Querschnitt der Einströmöffnung größer ist als der Querschnitt der Verbindungskammer. Durch das erfindungsgemäße Ausgestalten der mehrstufigen Wälzkolbenpumpe mit zweizähnigen Drehkolben kann ein hohes Saugvermögen erzielt werden. Durch Vorsehen eines eine große Einströmöffnung aufweisenden Einströmraums können auch bei innerhalb der Zwischenwände angeordneten, dadurch verkürzten Verbindungskanälen die Strömungswiderstände verringert werden. Dies verringert die erforderliche Leistungsaufnahme der Pumpe und erhöht das Saugvermögen und somit den Wirkungsgrad der Pumpe.The multi-stage Roots pump according to the invention has several pump chambers formed in a pump housing. In each of the pump chambers, two two-toothed rotary pistons are arranged to form a pump stage. Adjacent pump stages are separated from one another by partition walls. Connecting channels are arranged in the partition walls to connect the adjacent pump stages to one another. According to the invention, the connecting channels are designed in such a way that at least one, preferably all, connecting channels are connected to an axial inflow space in which the pumped medium flows from the pump chamber of a pump stage through an inflow opening into the inflow space. According to the invention, the inflow opening is designed in such a way that the cross section of the inflow opening is larger than the cross section of the connecting chamber. By designing the multi-stage Roots pump with two-toothed rotary pistons according to the invention, a high suction capacity can be achieved. By providing an inflow space with a large inflow opening, the flow resistance can be reduced even in the case of connecting channels arranged within the partition walls and thus shortened. This reduces the required power consumption of the pump and increases the suction capacity and thus the efficiency of the pump.
Da es sich erfindungsgemäß um eine Wälzkolbenpumpe mit zweizähnigen Drehkolben handelt, ist es bevorzugt, dass der Verbindungskanal zwischen zwei Pumpstufen im Wesentlichen insbesondere ausschließlich radial angeordnet ist und vollständig in der Zwischenwand verläuft. Der Verbindungskanal weist somit zumindest einen, insbesondere ausschließlich radial verlaufenden Kanalabschnitt auf. Besonders bevorzugt ist es, dass der gesamte Verbindungskanal radial angeordnet ist, wobei der Verbindungskanal hierbei insbesondere mit einem in Strömungsrichtung vorgelagerten axialen Einströmraum vorzugsweise unmittelbar verbunden ist. Besonders bevorzugt ist es, dass zusätzlich ein axialer Ausströmraum vorgesehen ist, der vorzugsweise ebenfalls unmittelbar mit dem radial verlaufenden Verbindungskanal verbunden ist. Der Ausströmraum ist sodann über eine Ausströmöffnung mit der nächsten Pumpstufe verbunden, wobei die Ausströmöffnung des Verbindungskanals den Einlass der nächsten Pumpstufe ausbildet.Since the invention relates to a Roots pump with two-toothed rotary pistons, it is preferred that the connecting channel between two pump stages is arranged essentially, in particular exclusively, radially and runs completely in the intermediate wall. The connecting channel thus has at least one, in particular exclusively radially extending channel section. It is particularly preferred that the entire connecting channel is arranged radially, the connecting channel being preferably directly connected in particular to an axial inflow space arranged upstream in the direction of flow. It is particularly preferred that an axial outflow space is additionally provided, which is preferably also directly connected to the radially extending connecting channel. The outflow space is then connected to the next pump stage via an outflow opening, the outflow opening of the connecting channel forming the inlet of the next pump stage.
Vorzugsweise weist die Einströmöffnung des Einströmraums einen größeren Querschnitt als der radiale Kanalabschnitt des Verbindungskanals und insbesondere als der im Wesentlichen ausschließlich radial verlaufende Verbindungskanal auf. Besonders bevorzugt ist, dass der Querschnitt der Einströmöffnung mindestens 10%, insbesondere mindestens 20% und besonders bevorzugt mindestens 30% größer als der Querschnitt des Verbindungskanals ist.Preferably, the inflow opening of the inflow space has a larger cross-section than the radial channel section of the connecting channel and in particular than the essentially exclusively radially extending connecting channel. It is particularly preferred that the cross-section of the inflow opening is at least 10%, in particular at least 20% and particularly preferably at least 30% larger than the cross-section of the connecting channel.
Zur weiteren Verringerung der auftretenden Strömungswiderstände ist es ferner bevorzugt, dass vorzugsweise alle Kanten an der Einströmöffnung vorzugsweise auch an Übergängen zwischen dem Einströmraum und dem Verbindungskanal durch Radien strömungsgünstig abgerundet sind. Vorzugsweise ist der Radius der Rundung größer als zwei Millimeter.To further reduce the flow resistance that occurs, it is also preferred that preferably all edges at the inflow opening, preferably also at transitions between the inflow space and the connecting channel, are rounded off with radii to improve flow. The radius of the rounding is preferably greater than two millimeters.
Bei einer weiteren bevorzugten Ausführungsform ist dem Einströmraum in Strömungsrichtung ein Vorraum vorgelagert. Das zu prüfende fördernde Medium gelangt somit zumindest teilweise zunächst in einen Vorraum, bevor es sodann in den Einströmraum weitergeleitet wird. Ggf. kann die Anordnung des Vorraums und des Einströmraums jedoch so ausgebildet sein, dass das Medium auch aus der Pumpkammer unmittelbar in den Einströmraum gelangen kann. Durch eine derartige Ausgestaltung werden die Strömungswiderstände weiter verringert. Das Vorsehen eines Vorraums stellt unabhängig von dem Querschnitt der Einströmöffnung eine unabhängige Erfindung dar.In a further preferred embodiment, an antechamber is arranged in front of the inflow chamber in the direction of flow. The medium to be tested thus initially reaches at least partially an antechamber before it is then passed on to the inflow chamber. If necessary, the arrangement of the antechamber and the inflow chamber can be designed in such a way that the medium can also reach the inflow chamber directly from the pump chamber. This design reduces the Flow resistance is further reduced. The provision of an anteroom represents an independent invention, independent of the cross-section of the inlet opening.
In besonders bevorzugter Weiterbildung ist der Vorraum radial zum Drehkolbenpaar angeordnet. Dies hat den Vorteil, dass das zu fördernde Medium beim Einströmen in den Vorraum nicht umgelenkt werden muss. Besonders bevorzugt ist es daher, dass der Vorraum einen Teil der Pumpkammer ausbildet, in den die Drehkolben jedoch nicht hineinragen. Besonders bevorzugt erstreckt sich der Vorraum über die gesamte Breite der Pumpkammer, so dass ein strömungswiderstandsfreies Einströmen des Mediums in den Vorraum möglich ist.In a particularly preferred development, the antechamber is arranged radially to the rotary piston pair. This has the advantage that the medium to be pumped does not have to be diverted when flowing into the antechamber. It is therefore particularly preferred that the antechamber forms a part of the pump chamber into which the rotary pistons do not protrude. The antechamber particularly preferably extends over the entire width of the pump chamber, so that the medium can flow into the antechamber without flow resistance.
Bei einer besonders bevorzugten Weiterbildung der Erfindung sind die in den Zwischenwänden angeordneten Verbindungskanäle zusätzlich mit einem Ausströmraum verbunden. Hierbei ist es bevorzugt, dass die Verbindung insbesondere unmittelbar erfolgt, wobei vorzugsweise der Verbindungskanal ausschließlich radial innerhalb der Zwischenwände angeordnet ist. Vorzugsweise weist der Ausströmraum eine Ausströmöffnung auf. Der Querschnitt der Ausströmöffnung ist hierbei vorzugsweise derart ausgebildet, dass er größer als der Querschnitt des Verbindungskanals ist. Der Querschnitt der Ausströmöffnung ist vorzugsweise 10%, insbesondere 20% und besonders bevorzugt 30% größer als der Querschnitt des Verbindungskanals. Des Weiteren sind auch in diesem Bereich die Kanten vorzugsweise wie in dem Bereich des Einströmraums abgerundet.In a particularly preferred development of the invention, the connecting channels arranged in the partition walls are additionally connected to an outflow space. In this case, it is preferred that the connection is made directly, with the connecting channel preferably being arranged exclusively radially within the partition walls. The outflow space preferably has an outflow opening. The cross section of the outflow opening is preferably designed such that it is larger than the cross section of the connecting channel. The cross section of the outflow opening is preferably 10%, in particular 20% and particularly preferably 30% larger than the cross section of the connecting channel. Furthermore, the edges in this area are also preferably rounded as in the area of the inflow space.
In einer besonders bevorzugten Weiterbildung der Erfindung ist zusätzlich ein Nachraum vorgesehen. Dieser ist in Strömungsrichtung dem Ausströmraum nachgelagert. Hierbei kann der Nachraum derart angeordnet und ausgebildet sein, dass das Medium aus dem Ausströmraum durch die Ausströmöffnung vollständig oder nur teilweise in den Nachraum strömt. Das Medium kann somit in die nachfolgende Pumpstufe, ggf. teilweise unmittelbar aus der Ausströmöffnung einströmen oder aber ganz oder teilweise zunächst in den Nachraum strömen, um sodann aus diesem in die nächste Pumpkammer einzuströmen. Der Nachraum ist vorzugsweise entsprechend dem Vorraum ausgebildet. Insbesondere ist der Nachraum vorzugsweise radial zu dem Drehkolbenpaar angeordnet. Bevorzugt ist es hierbei wiederum, dass die Drehkolben nicht in den Vorraum hineinragen und sich der Vorraum insbesondere über die gesamte Breite der Pumpstufe erstreckt.In a particularly preferred development of the invention, an additional after-chamber is provided. This is located downstream of the outflow chamber in the direction of flow. The after-chamber can be arranged and designed in such a way that the medium from the outflow chamber flows through the outflow opening completely or only partially into the after-chamber. The medium can thus flow into the subsequent pumping stage, possibly partially directly from the outflow opening or else flow completely or partially into the after-chamber in order to then flow from there into the next pump chamber. The after-chamber is preferably designed in the same way as the anteroom. In particular, the after-chamber is preferably arranged radially to the rotary piston pair. It is again preferred here that the rotary pistons do not protrude into the anteroom and that the anteroom extends in particular over the entire width of the pump stage.
Gemäß der Erfindung weist das Gehäuse mindestens einen Einlassdeckel auf. Der mindestens eine Einlassdeckel bildet eine Seitenwand des Einströmraums insbesondere vollständig aus. Durch Öffnen bzw. Entfernen des mindestens einen Einlassdeckels ist der Einströmraum beispielsweise zum Reinigen auf einfache Weise zugänglich. Ferner ist durch Vorsehen des mindestens einen Einlassdeckels die Geometrie vereinfacht und insofern die Herstellung einfacher.According to the invention, the housing has at least one inlet cover. The at least one inlet cover forms a side wall of the inflow chamber, in particular completely. By opening or removing the at least one inlet cover, the inflow chamber is easily accessible, for example for cleaning. Furthermore, by providing the at least one inlet cover, the geometry is simplified and production is therefore easier.
In bevorzugter Weiterbildung ist ein beispielsweise zusätzlicher Einlassdeckel vorgesehen, der eine Seitenwand des Vorraums ausbildet. Auch dieser Seitendeckel ist vorzugsweise derart ausgebildet, dass dieser die Wand vollständig ausbildet, so dass der Vorraum beispielswiese zum Reinigen gut zugänglich ist. Hierdurch ist wiederum die Geometrie vereinfacht und insofern eine kostengünstigere Herstellung möglich. Über den Einlassdeckel des Vorraums ist ferner der Pumpraum gut zugänglich.In a preferred development, an additional inlet cover is provided, for example, which forms a side wall of the anteroom. This side cover is also preferably designed in such a way that it completely forms the wall, so that the anteroom is easily accessible, for example for cleaning. This in turn simplifies the geometry and thus enables more cost-effective production. The pump chamber is also easily accessible via the inlet cover of the anteroom.
Besonders bevorzugt ist es, dass ein Seitendeckel sowohl eine Seitenwand des Einströmraums als auch des Vorraums ausbildet. In besonders bevorzugter Weiterbildung erstreckt sich der Einlassdeckel über mindestens zwei benachbarte Pumpstufen und besonders bevorzugt über sämtliche Pumpstufen der mehrstufigen Wälzkolbenpumpe.It is particularly preferred that a side cover forms a side wall of both the inflow chamber and the anteroom. In a particularly preferred development, the inlet cover extends over at least two adjacent pump stages and particularly preferably over all pump stages of the multi-stage Roots pump.
Gemäß der Erfindung, weist das Gehäuse mindestens einen Auslassdeckel auf, der eine Seitenwand des Ausströmraums ausbildet. Der Auslassdeckel ist hierbei vorzugsweise entsprechend dem Einlassdeckel weitergebildet, wobei insbesondere auch ein Auslassdeckel für einen Nachraum vorgesehen ist und in besonders bevorzugter Ausführungsform sich der Auslassdeckel über eine oder mehrere Pumpstufen, insbesondere alle Pumpstufen, erstreckt.According to the invention, the housing has at least one outlet cover which forms a side wall of the outflow chamber. The outlet cover is preferably further developed in accordance with the inlet cover, wherein in particular an outlet cover is also provided for an after-chamber and in a particularly preferred embodiment the outlet cover extends over one or more pump stages, in particular all pump stages.
Nachfolgend wird die Erfindung anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die anliegenden Zeichnungen näher erläutert.The invention is explained in more detail below using a preferred embodiment with reference to the accompanying drawings.
Es zeigen:
- Fig. 1
- Prinzipskizzen einer zweistufigen erfindungsgemäßen Wälzkolbenpumpe in Schnittansicht in unterschiedlichen Drehstellungen des Wälzkolbenpaars,
- Fig. 2
- einen schematischen perspektivischen Längsschnitt der erfindungsgemäßen mehrstufigen Wälzkolbenpumpe, und
- Fig. 3
- eine schematische Darstellung eines Einlassbereichs des Einströmraums in Draufsicht.
- Fig.1
- Schematic diagrams of a two-stage Roots pump according to the invention in sectional view in different rotational positions of the Roots pair,
- Fig. 2
- a schematic perspective longitudinal section of the multi-stage Roots pump according to the invention, and
- Fig. 3
- a schematic representation of an inlet area of the inflow chamber in plan view.
Jede Pumpstufe der erfindungsgemäßen mehrstufigen Wälzkolbenpumpe weist ein Wälzkolbenpaar auf. Das Wälzkolbenpaar umfasst jeweils zwei zweizähnige Drehkolben 10. Diese sind jeweils auf einer Welle 12 angeordnet und werden in entgegengesetzte Richtung zum Fördern des Mediums gedreht. Die einzelnen Wälzkolben der hintereinander angeordneten Pumpstufen sind jeweils auf einer gemeinsamen Welle angeordnet, so dass die Wälzkolbenpumpe zwei Wellen 12 aufweist. Die Wälzkolben 10 jeweils eines Wälzkolbenpaares sind in einer eine Pumpstufe ausbildenden Pumpkammer 14 angeordnet. Die Pumpkammer ist durch ein zweiteiliges Gehäuse 16, 18 ausgebildet. Eine Gehäusetrennung 20 ist hierbei in der Mitte der beiden Wellen 12 vorgesehen, so dass eine einfache Montage möglich ist. Des Weiteren ist das Gehäuse mit einem Einlassdeckel 22 und einem Auslassdeckel 24 versehen.Each pump stage of the multi-stage Roots pump according to the invention has a pair of Roots. The pair of Roots comprises two two-
Aus dem in
In radialer Richtung, dem Haupteinlass 36 gegenüberliegend, ist ein Vorraum 38 ausgebildet. Der Vorraum 38 erstreckt sich über die gesamte axiale Breite der Pumpstufe 26 und weist somit im Wesentlichen dieselbe Breite wie die Wälzkolben 10 der ersten Pumpstufe 36 auf.In the radial direction, opposite the
Des Weiteren ist ein Einströmraum 40 vorgesehen. Der Einströmraum 40 schließt sich einerseits an den Vorraum 38 an, und weist ferner eine im dargestellten Ausführungsbeispiel eine unmittelbare Verbindung zur Pumpkammer 14 aufweisende Einströmöffnung 42 auf.Furthermore, an
An den Einströmraum 40 schließt sich ein innerhalb einer Zwischenwand 44 angeordneter Verbindungskanal 48 an. Das zu fördernde Medium strömt in
An den im dargestellten Ausführungsbeispiel ausschließlich radial verlaufenden Verbindungskanal 48 schließt sich ein dem Einströmraum 40 entsprechender Ausströmraum 50 und an diesen ein entsprechend dem Vorraum 38 ausgebildeter Nachraum 52 an. Der Ausströmraum 50 weist eine Ausströmöffnung 54 auf, die im dargestellten Ausführungsbeispiel der Kontur und Ausgestaltung der Einströmöffnung 42 entspricht.The connecting
Im dargestellten Ausführungsbeispiel sind sämtliche Pumpstufen entsprechend aufgebaut, wobei die Pumpstufen jeweils durch Zwischenwände 44 voneinander getrennt sind und in jeder Zwischenwand 44 ein im dargestellten Ausführungsbeispiel radial verlaufender Verbindungskanal 48 angeordnet ist. Jeder Verbindungskanal 48 ist jeweils mit einem Einströmraum 40 und einem Ausströmraum 50 sowie einem Vorraum 38 und einem Nachraum 52 verbunden.In the embodiment shown, all pump stages are constructed accordingly, with the pump stages being separated from one another by
Insbesondere zur Verringerung der Strömungswiderstände sind die Einlassöffnungen 42 der Einströmräume 40 sowie vorzugsweise auch die Auslassöffnungen 54 der Ausströmräume 50 derart ausgebildet, dass sie einen größeren Querschnitt als die Verbindungskanäle 48 aufweisen.In particular to reduce the flow resistance, the
Ferner sind sowohl die Einströmräume 40 als auch die Vorräume 38 mit einem gemeinsamen Einlassdeckel 24 verbunden. Entsprechend sind auch die Ausströmräume 50 sowie die Nachräume 52 mit einem gemeinsamen Auslassdeckel 22 verbunden.Furthermore, both the
Die letzte Pumpstufe 34 ist ferner mit einem nicht dargestellten Hauptauslass verbunden, durch den das zu fördernde Medium ausgestoßen wird.The
In
Wie ferner ersichtlich ist, ist der Einströmraum 40 einerseits unmittelbar mit der entsprechenden Pumpkammer 14 und andererseits auch mit dem Vorraum 38 verbunden. Entsprechendes gilt für die Ausströmöffnung 54.As can also be seen, the
Claims (15)
- A multistage Roots pump, comprisinga plurality of pump chambers (14) defined by a pump housing (16, 18), in which pump chambers two two-toothed rotary pistons (10) are arranged for configuring a pump stage (26, 28, 30, 32, 34),partition walls (44) separating said adjacent pump stages (26, 28, 30, 32, 34) from each other, andconnecting ducts (48) arranged in said partition walls (44) and connecting said adjacent pump stages (26, 28, 30, 32, 34) with each other, and wherein said connecting ducts (48) are connected with an axial inflow chamber (40) into which the delivered medium flows from said pump chamber (14) of a pump stage (26, 28, 30, 32, 34) through an inflow opening (42), wherein said inflow opening (42) has a larger cross-section than said connecting duct (48),characterized in thatthe pump housing (16, 18) comprises at least one inlet cover (24) which constitutes a sidewall of the inflow chamber (40), andthe pump housing (16, 18) comprises at least one outlet cover (22) which constitutes a sidewall of an outlet chamber (50) connected with the connecting ducts (48).
- The multistage Roots pump according to claim 1, characterized in that the connecting duct (48) is essentially in particular exclusively radially arranged.
- The multistage Roots pump according to claim 2, characterized in that the connecting duct (48) is directly connected with the inflow chamber (40).
- The multistage Roots pump according to any one of claims 1-3, characterized in that the cross-section of the inflow opening (42) is by at least 10 %, in particular at least 20 % and more preferably at least 30 % larger than the cross-section of the connecting duct (48).
- The multistage Roots pump according to any one of claims 1-4, characterized in that preferably all edges of the inflow opening (42) are rounded in a flow-enhancing manner.
- The multistage Roots pump according to any one of claims 1-5, characterized by a prechamber (38) arranged upstream of the inflow chamber (40) as seen in the direction of flow.
- The multistage Roots pump according to claim 6, characterized in that the prechamber (38) is arranged radially with respect to the pair of rotary pistons (10).
- The multistage Roots pump according to claim 6 or 7, characterized in that the prechamber (38) is a portion of the pump chamber (14) into which the rotary pistons (10) do not project.
- The multistage Roots pump according to any one of claims 1-8, characterized in that the connecting duct (48) is directly connected with the outflow chamber (50).
- The multistage Roots pump according to claim 9, characterized in that an outflow opening (54) of the outflow chamber (50), through which the delivered medium flows out into the pump chamber (14), has a larger cross-section than the connecting duct (48).
- The multistage Roots pump according to claim 9 or 10, characterized in that the cross-section of the outflow opening (54) is by at least 10 %, in particular at least 20 % and more preferably at least 30 % larger than the cross-section of the connecting duct (48), wherein preferably all edges of the outflow opening (54) are rounded in a flow-enhancing manner.
- The multistage Roots pump according to any one of claims 9-11, characterized by a postchamber (52) arranged downstream of the outflow chamber (50) as seen in the direction of flow, wherein the postchamber (52) is arranged radially with respect to the rotary pistons (10).
- The multistage Roots pump according to claim 12, characterized in that the postchamber (54) is a portion of the pump chamber (14) into which the rotary pistons (10) do not project.
- The multistage Roots pump according to any one of claims 1-13, characterized in that the inlet cover (24) constitutes a sidewall of the prechamber (38).
- The multistage Roots pump according to any one of claims 1-14, characterized in that the outlet cover (22) constitutes a sidewall of the postchamber (52).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE202017001029.1U DE202017001029U1 (en) | 2017-02-17 | 2017-02-17 | Multi-stage Roots pump |
PCT/EP2018/051641 WO2018149598A1 (en) | 2017-02-17 | 2018-01-24 | Multi-stage rotary lobe pump |
Publications (2)
Publication Number | Publication Date |
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EP3583319A1 EP3583319A1 (en) | 2019-12-25 |
EP3583319B1 true EP3583319B1 (en) | 2024-05-15 |
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ID=61054390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18701730.6A Active EP3583319B1 (en) | 2017-02-17 | 2018-01-24 | Multi-stage rotary lobe pump |
Country Status (8)
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US (1) | US11255328B2 (en) |
EP (1) | EP3583319B1 (en) |
JP (1) | JP2020507704A (en) |
KR (1) | KR102490780B1 (en) |
CN (1) | CN110168227A (en) |
CA (1) | CA3053679A1 (en) |
DE (1) | DE202017001029U1 (en) |
WO (1) | WO2018149598A1 (en) |
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US3198120A (en) * | 1962-10-29 | 1965-08-03 | Waukesha Foundry Co | Multiple positive displacement pump |
GB2088957B (en) * | 1980-12-05 | 1984-12-12 | Boc Ltd | Rotary positive-displacement fluidmachines |
DE3312117A1 (en) * | 1983-04-02 | 1984-10-04 | Leybold-Heraeus GmbH, 5000 Köln | TWO-SHAFT VACUUM PUMP WITH INTERNAL COMPRESSION |
JPS6188764A (en) | 1984-10-08 | 1986-05-07 | Hitachi Ltd | Thyristor type ac power controller |
JPS6319090U (en) * | 1986-07-23 | 1988-02-08 | ||
EP0738833B1 (en) | 1995-04-19 | 2000-09-20 | Ebara Corporation | Multistage positive-displacement vacuum pump |
JP2000170679A (en) * | 1998-12-04 | 2000-06-20 | Toyota Autom Loom Works Ltd | Multi-stage roots pump and multi-stage pump |
JP2000205148A (en) * | 1999-01-11 | 2000-07-25 | Toyota Autom Loom Works Ltd | Multistage route pump and manufacture of rotor housing of multistage route pump |
JP3991918B2 (en) * | 2003-05-19 | 2007-10-17 | 株式会社豊田自動織機 | Roots pump |
TWI237093B (en) | 2003-10-23 | 2005-08-01 | Ind Tech Res Inst | Multi-staged vacuum pump |
JP2005155540A (en) * | 2003-11-27 | 2005-06-16 | Aisin Seiki Co Ltd | Multistage dry-sealed vacuum pump |
GB0515905D0 (en) | 2005-08-02 | 2005-09-07 | Boc Group Plc | Vacuum pump |
CN101382137A (en) * | 2007-09-07 | 2009-03-11 | 中国科学院沈阳科学仪器研制中心有限公司 | Multi-stage roots dry vacuum pump discharging directly into atmosphere |
JP5227056B2 (en) * | 2008-03-24 | 2013-07-03 | アネスト岩田株式会社 | Multistage pump |
CN201396281Y (en) * | 2009-03-19 | 2010-02-03 | 孙成忠 | Multistage three-blade Roots vacuum pump |
JP5370298B2 (en) * | 2010-07-14 | 2013-12-18 | 株式会社豊田自動織機 | Roots fluid machinery |
DE202011104491U1 (en) | 2011-08-17 | 2012-11-20 | Oerlikon Leybold Vacuum Gmbh | Roots |
FR3001263B1 (en) * | 2013-01-18 | 2015-02-20 | Adixen Vacuum Products | DRY TYPE MULTI-STAGE VACUUM PUMP |
DE112015004060T5 (en) * | 2014-09-04 | 2017-07-06 | Scoprega S.P.A. | Volumetric compressor |
-
2017
- 2017-02-17 DE DE202017001029.1U patent/DE202017001029U1/en active Active
-
2018
- 2018-01-24 JP JP2019540089A patent/JP2020507704A/en active Pending
- 2018-01-24 WO PCT/EP2018/051641 patent/WO2018149598A1/en unknown
- 2018-01-24 US US16/476,817 patent/US11255328B2/en active Active
- 2018-01-24 KR KR1020197023787A patent/KR102490780B1/en active IP Right Grant
- 2018-01-24 EP EP18701730.6A patent/EP3583319B1/en active Active
- 2018-01-24 CN CN201880006099.2A patent/CN110168227A/en active Pending
- 2018-01-24 CA CA3053679A patent/CA3053679A1/en active Pending
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KR20190112002A (en) | 2019-10-02 |
DE202017001029U1 (en) | 2018-05-18 |
JP2020507704A (en) | 2020-03-12 |
CN110168227A (en) | 2019-08-23 |
US11255328B2 (en) | 2022-02-22 |
CA3053679A1 (en) | 2018-08-23 |
KR102490780B1 (en) | 2023-01-19 |
US20190376515A1 (en) | 2019-12-12 |
EP3583319A1 (en) | 2019-12-25 |
WO2018149598A1 (en) | 2018-08-23 |
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