EP0290662B1 - Positive-displacement two-shaft vacuum pump - Google Patents

Positive-displacement two-shaft vacuum pump Download PDF

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Publication number
EP0290662B1
EP0290662B1 EP87107089A EP87107089A EP0290662B1 EP 0290662 B1 EP0290662 B1 EP 0290662B1 EP 87107089 A EP87107089 A EP 87107089A EP 87107089 A EP87107089 A EP 87107089A EP 0290662 B1 EP0290662 B1 EP 0290662B1
Authority
EP
European Patent Office
Prior art keywords
pump
shafts
shaft
drive motor
drive
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.)
Expired - Lifetime
Application number
EP87107089A
Other languages
German (de)
French (fr)
Other versions
EP0290662A1 (en
Inventor
Hanns-Peter Dr. Berges
Hartmut Kriehn
Wolfgang Leier
Ralf Steffens
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.)
Balzers und Leybold Deutschland Holding AG
Original Assignee
Leybold AG
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 Leybold AG filed Critical Leybold AG
Priority to EP87107089A priority Critical patent/EP0290662B1/en
Priority to EP90116358A priority patent/EP0409287B1/en
Priority to DE8787107089T priority patent/DE3785192D1/en
Priority to US07/193,659 priority patent/US4940398A/en
Priority to JP63115014A priority patent/JPS63302194A/en
Publication of EP0290662A1 publication Critical patent/EP0290662A1/en
Application granted granted Critical
Publication of EP0290662B1 publication Critical patent/EP0290662B1/en
Priority to JP007947U priority patent/JPH10192U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04C18/08—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
    • F04C18/123—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 or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/02—Arrangements of bearings
    • 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
    • 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
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps
    • 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
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • 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
    • F04C2240/50—Bearings
    • F04C2240/52—Bearings for assemblies with supports on both sides

Definitions

  • the invention relates to a twin-shaft vacuum pump with the features of the preamble of claim 1.
  • FR-A-12 90 239 and GB-A-12 48 032 also belongs to the prior art.
  • the first-mentioned document discloses a single-stage vacuum pump. There are two rotors with interlocking spirals in the scoop. The rotors are each supported on a fixed mandrel, there are no shafts.
  • GB-A-12 48 032 discloses a one-stage and a two-stage version of a vacuum pump. The rotors are of the screw type. In the single-stage version, the rotors are each supported on a fixed mandrel. Overall, the multi-stage version in particular has a high design due to the special choice of screw rotors. The position of the drive motor and a particularly suitable cooling system are not disclosed.
  • the present invention has for its object to provide a twin-shaft vacuum pump of the type mentioned, which is relatively compact, requires a small footprint and is easy to install and service.
  • a twin-shaft vacuum pump designed in this way requires a relatively small footprint.
  • assembly and service work can be carried out easily.
  • a complete cooling water drain is particularly easy.
  • the pump designed according to the invention can be combined in a simple manner with vertically conveying Roots pumps.
  • any condensation within the pump stages flow downward and out of the pump outlet because of the vertically arranged waves, so that in the long run harmful effects of condensation do not occur.
  • flushing the pump to remove annoying deposits by introducing the flushing liquid into the inlet.
  • the rotary pistons are of the chewing type (see FIG. 2) and rotate in the scoops 11, 12, 13, which are formed by the shields 14 to 17 and the housing rings 18 to 20.
  • the shafts 2, 3 are arranged vertically. This also applies to the drive motor 22 arranged next to the pump housing. Below the lower bearing plate 17, the shafts 2, 3 are equipped with gear wheels 23, 24 of the same diameter, which synchronize the movement of the rotor pairs 4, 5 or 6, 7 or 8 , 9 serve.
  • the drive motor 22 also has a gearwheel 25 on its underside. The drive connection is established by a further gearwheel 26 which is in engagement with the gearwheels 24 and 25.
  • the shafts 2, 3 are supported by roller bearings 27.
  • the upper end plate 14 is equipped with a horizontally arranged connecting flange 28, which forms the inlet 29 of the pump.
  • the inlet channel 31 opens at the end (opening 32) into the scoop chamber 11 of the first stage.
  • the end opening of the first stage is designated 33 and leads into the connecting channel 34.
  • the connecting channel 34 located in the shield 15 is connected to the inlet opening 35 of the second stage.
  • the end shield 16 is designed accordingly.
  • Below the lowest (third) pump stage is the outlet 36, which is connected to the front outlet opening 37 in the lower end plate 17.
  • An oil-containing space 40 formed by a common shaft trough 41, is provided below the system consisting of the pump housing and motor.
  • An oil pump 42 connected to the shaft 2 projects into this shaft trough 41.
  • Lubricant channels not shown in detail, extend from the oil pump to the points of the pump (bearings, engagements of the gearwheels 23 to 26, oil seals or the like) which require oil lubrication .
  • cooling water channels 43 and 44 are provided in the side plates 14 and 17. Cooling water inlet and outlet are designated 45 and 46.
  • the cooling water inlet 45 is arranged at the lowest point of the channel system 43, 44, so that a simple cooling water drain is possible and complete emptying is ensured.
  • Fig. 3 shows a longitudinal section through a two-stage two-shaft vacuum pump according to the invention.
  • the drive motor 22 is arranged below the pump. Its shaft 51 forms an axial extension of the shaft 2.
  • the motor shaft 51 and pump shaft 2 are expediently formed in one piece.
  • the drive motor 22 is water-cooled and for this purpose equipped with a double-walled housing 52.
  • the cooling channel 53 thus formed is connected to the cooling system 43 to 46 of the pump housing.
  • the connecting lines required for this are designated 54 and 55.
  • the synchronization wheels 23, 24 and the oil chamber 40, into which the oil pump 42 projects, are located between the drive motor 22 and the lower end plate 17.
  • the oil pump 42 is coupled to the drive shaft 3.
  • the embodiment according to FIG. 3 has a small overall height despite the pump housing and drive motor lying axially one behind the other, since on the one hand the pump and motor have a common shaft and - because of the water cooling - the drive motor does not require a cooling fan. A separate engine mounting can also be omitted.
  • the cooling water inlet is arranged as far down on the motor housing 52 so that it can be used as a cooling water outlet in a simple manner. Complete drainage of the entire cooling system is guaranteed.
  • the embodiment according to FIG. 4 is a single-stage two-shaft vacuum pump with a drive motor 22 arranged next to it.
  • This arrangement has the advantage that a belt or chain drive (the latter is shown) can be used.
  • the shaft 3 of the vacuum pump and the shaft 51 of the motor 22 are equipped with gear wheels 56 and 57 and connected to one another via a chain, not shown in detail.
  • the advantage of this solution is that speed differences (e.g. drive motors with 50 or 60 Hz) can be compensated for in a simple manner.
  • drives of this type have the advantage of better damping.
  • FIG. 4 shows a special feature which relates to the design of the mounting of the shafts 2, 3 in the end shield 14.
  • essentially cylindrical fitting pieces 61, 62 are connected, which have a pot-shaped design 63 on the end face.
  • the shaft ends themselves or the end faces of the rotors can also be equipped with this cup-shaped design 63.
  • a cylindrical stump 65 which is fastened to a housing cover 66, projects into the respective cup-shaped space from above.
  • the bearing 27 is supported with its inner bearing ring on the fixed stump 65 and with its outer bearing ring on the inner wall of the cup-shaped design.
  • the cylindrical adapters 61, 62 form with the surrounding walls of the bearing plate 14 a gap seal, the z. B. can be formed as a labyrinth seal 67 (with piston rings located in the grooves). This ensures an effective separation of the storage rooms from the usually oil-free delivery rooms.
  • FIG. 5 shows an enlarged bearing arrangement of the type described in relation to FIG. 4.
  • a rotating ring 68 is provided above the bearing ring 27, which almost completely closes the storage space from the outside. A centrifugal effect also occurs. Lubricant reaching the ring 68 is conveyed outwards and thus back into the storage space.
  • a shaft sealing ring 69 is provided above the bearing 27, which also closes the storage space.
  • the sealing lip of the shaft sealing ring 68 bears against the stump 65 when the shaft 2, 3 is stationary. If the shaft rotates, then the sealing lip lifts off from the shaft end 65, so that the seal becomes contactless.

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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 bezieht sich auf eine Zweiwellenvakuumpumpe mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a twin-shaft vacuum pump with the features of the preamble of claim 1.

Aus der DE-OS 31 47 824 ist eine Zweiwellenvakuumpumpe dieser Art bekannt. In ihrer Betriebsstellung liegen die Wellen horizontal, so daß sich insbesondere dann, wenn die Pumpe mehrstufig ausgebildet ist, eine relativ große Baulänge ergibt bzw. eine relativ große Standfläche für eine Pumpe dieser Art erforderlich ist. Schwierig sind weiterhin Montage- und Servicearbeiten, da diese üblicherweise in der Betriebsstellung der Pumpe durchgeführt werden müssen.From DE-OS 31 47 824 a two-shaft vacuum pump of this type is known. In their operating position, the shafts are horizontal, so that a relatively large overall length or a relatively large footprint is required for a pump of this type, in particular if the pump is constructed in several stages. Installation and service work is still difficult, since this usually has to be carried out in the operating position of the pump.

Zum Stand der Technik gehört weiterhin der Inhalt der FR-A-12 90 239 sowie der GB-A-12 48 032. Die zuerst genannte Schrift offenbart eine einstufige Vakuumpumpe. Im Schöpfraum befinden sich zwei Rotoren mit ineinandergreifenden Spiralen. Die Rotoren sind jeweils auf einem festen Dorn gelagert, Wellen sind nicht vorhanden. Die GB-A- 12 48 032 offenbart eine einstufige und eine zweistufige Version einer Vakuumpumpe. Die Rotoren sind vom Schraubentyp. Bei der einstufigen Version stützen sich die Rotoren auf jeweils einem feststehenden Dorn ab. Insgesamt ergibt sich insbesondere bei der mehrstufigen Version wegen der besonderen Wahl der Schrauben-Rotoren eine hohe Bauweise. Die Lage des Antriebsmotors und ein besonders geeignetes Kühlsystem sind nicht offenbart.The content of FR-A-12 90 239 and GB-A-12 48 032 also belongs to the prior art. The first-mentioned document discloses a single-stage vacuum pump. There are two rotors with interlocking spirals in the scoop. The rotors are each supported on a fixed mandrel, there are no shafts. GB-A-12 48 032 discloses a one-stage and a two-stage version of a vacuum pump. The rotors are of the screw type. In the single-stage version, the rotors are each supported on a fixed mandrel. Overall, the multi-stage version in particular has a high design due to the special choice of screw rotors. The position of the drive motor and a particularly suitable cooling system are not disclosed.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Zweiwellenvakuumpumpe der eingangs genannten Art zu schaffen, die relativ kompakt ist, eine kleine Standfläche benötigt sowie montage- und servicefreundlich ist.The present invention has for its object to provide a twin-shaft vacuum pump of the type mentioned, which is relatively compact, requires a small footprint and is easy to install and service.

Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale der Patentansprüche gelöst. Eine in dieser Weise ausgebildete Zweiwellenvakuumpumpe benötigt eine relativ kleine Standfläche. Außerdem sind wegen der vertikalen Wellenanordnung Montage- und Servicearbeiten einfach durchführbar. Ein vollständiger Kühlwasserablaß ist besonders einfach. Wegen der besonderen Lage von Einlaß und Auslaß ist die erfindungsgemäß gestaltete Pumpe in einfacher Weise mit vertikal fördernden Wälzkolbenpumpen kombinierbar. Außerdem fließen eventuelle Kondensationen innerhalb der Pumpstufen wegen der vertikal angeordneten Wellen nach unten und aus dem Auslaß der Pumpe ab, so daß auf Dauer schädliche Wirkungen von Kondensationen nicht eintreten. Auf eine gesonderte Gasballastzufuhr kann verzichtet werden. Schließlich besteht die Möglichkeit, die Pumpe zur Beseitigung störender Beläge zu spülen, indem die Spülflüssigkeit in den Einlaß eingeleitet wird. Ohne besondere Maßnahmen verläßt die Spülflüssigkeit die Pumpe durch den Auslaß infolge der Schwerkraft, da alle Rotoren vom Klauentyp (Northey-Profil) sind. Bei Pumpen dieser Art befinden sich die Einlaß- und Auslaßöffnungen stirnseitig in den Seitenschilden, so daß auch das Abströmen von Flüssigkeiten aus den Verbindungskanälen sichergestellt ist. Schließlich kann eine vorgeschaltete Rootspumpe mit in einen Spülvorgang einbezogen werden.According to the invention, this object is achieved by the characterizing features of the claims. A twin-shaft vacuum pump designed in this way requires a relatively small footprint. In addition, due to the vertical shaft arrangement, assembly and service work can be carried out easily. A complete cooling water drain is particularly easy. Because of the special position of the inlet and outlet, the pump designed according to the invention can be combined in a simple manner with vertically conveying Roots pumps. In addition, any condensation within the pump stages flow downward and out of the pump outlet because of the vertically arranged waves, so that in the long run harmful effects of condensation do not occur. There is no need for a separate gas ballast supply. Finally, there is the possibility of flushing the pump to remove annoying deposits by introducing the flushing liquid into the inlet. Without any special measures, the flushing liquid leaves the pump through the outlet due to gravity, since all rotors are of the claw type (Northey profile). In pumps of this type, the inlet and outlet openings are located on the end faces in the side plates, so that the outflow of liquids from the connecting channels is also ensured. Finally, an upstream root pump can be included in a flushing process.

Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von in den Figuren 1 bis 4 dargestellten Ausführungsbeispielen erläutert werden. Es zeigen:

Fig. 1
einen Längsschnitt durch eine mehrstufige Pumpe nach der Erfindung mit nebeneinander angeordnetem Pumpengehäuse und Antriebsmotor,
Fig. 2
einen Schnitt durch ein Rotorpaar,
Fig. 3
eine mehrstufige Pumpe nach der Erfindung mit axial hintereinander angeordnetem Pumpengehäuse und Antriebsmotor,
Fig. 4
eine einstufige Pumpe nach der Erfindung mit einem besonderen Lagerkonzept und
Figuren 5, 6
zweckmäßige Lagerungen für die oberen Wellenenden.
Further advantages and details of the invention will be explained on the basis of the exemplary embodiments illustrated in FIGS. 1 to 4. Show it:
Fig. 1
2 shows a longitudinal section through a multi-stage pump according to the invention with a pump housing and drive motor arranged side by side,
Fig. 2
a section through a pair of rotors,
Fig. 3
A multi-stage pump according to the invention with a pump housing and drive motor arranged axially one behind the other,
Fig. 4
a single-stage pump according to the invention with a special storage concept and
Figures 5, 6
appropriate bearings for the upper shaft ends.

Bei dem in Fig. 1 dargestellten Ausführungsbeispiel handelt es sich um eine dreistufige Vakuumpumpe 1 mit zwei Wellen 2 und 3 sowie drei Rotorpaaren 4, 5 bzw. 6, 7 bzw. 8, 9. Die axiale Länge der Rotoren nimmt von der Saugseite zur Druckseite ab. Die Drehkolben sind vom Kauentyp (vergleiche Fig. 2) und rotieren in den Schöpfräumen 11, 12, 13, welche von den Schilden 14 bis 17 und den Gehäuseringen 18 bis 20 gebildet werden.1 is a three-stage vacuum pump 1 with two shafts 2 and 3 and three pairs of rotors 4, 5 and 6, 7 and 8, 9. The axial length of the rotors increases from the suction side to the pressure side from. The rotary pistons are of the chewing type (see FIG. 2) and rotate in the scoops 11, 12, 13, which are formed by the shields 14 to 17 and the housing rings 18 to 20.

Die Wellen 2, 3 sind vertikal angeordnet. Dieses gilt ebenfalls für den neben dem Pumpengehäuse angeordneten Antriebsmotor 22. Unterhalb des unteren Lagerschildes 17 sind die Wellen 2, 3 mit Zahnrädern 23, 24 gleichen Durchmessers ausgerüstet, welche der Synchronisation der Bewegung der Rotorpaare 4, 5 bzw. 6, 7 bzw. 8, 9 dienen. Auch der Antriebsmotor 22 weist an seiner Unterseite ein Zahnrad 25 auf. Die Antriebsverbindung wird hergestellt durch ein weiteres Zahnrad 26, das mit den Zahnrädern 24 und 25 in Eingriff steht.The shafts 2, 3 are arranged vertically. This also applies to the drive motor 22 arranged next to the pump housing. Below the lower bearing plate 17, the shafts 2, 3 are equipped with gear wheels 23, 24 of the same diameter, which synchronize the movement of the rotor pairs 4, 5 or 6, 7 or 8 , 9 serve. The drive motor 22 also has a gearwheel 25 on its underside. The drive connection is established by a further gearwheel 26 which is in engagement with the gearwheels 24 and 25.

In dem oberen Lagerschild 14 und dem unteren Lagerschild 17 stützen sich die Wellen 2, 3 über Wälzlager 27 ab. Der obere Lagerschild 14 ist mit einem horizontal angeordneten Anschlußflansch 28 ausgerüstet, welcher den Einlaß 29 der Pumpe bildet. Der Einlaßkanal 31 mündet stirnseitig (Öffnung 32) in den Schöpfraum 11 der ersten Stufe. Die stirnseitig angeordnete Auslaßöffnung der ersten Stufe ist mit 33 bezeichnet und führt in den Verbindungskanal 34. Der im Schild 15 befindliche Verbindungskanal 34 steht mit der Einlaßöffnung 35 der zweiten Stufe in Verbindung. Der Lagerschild 16 ist entsprechend gestaltet. Unterhalb der untersten (dritten) Pumpstufe befindet sich der Auslaß 36, der mit der stirnseitigen Auslaßöffnung 37 im unteren Lagerschild 17 in Verbindung steht.In the upper end plate 14 and the lower end plate 17, the shafts 2, 3 are supported by roller bearings 27. The upper end plate 14 is equipped with a horizontally arranged connecting flange 28, which forms the inlet 29 of the pump. The inlet channel 31 opens at the end (opening 32) into the scoop chamber 11 of the first stage. The end opening of the first stage is designated 33 and leads into the connecting channel 34. The connecting channel 34 located in the shield 15 is connected to the inlet opening 35 of the second stage. The end shield 16 is designed accordingly. Below the lowest (third) pump stage is the outlet 36, which is connected to the front outlet opening 37 in the lower end plate 17.

Unterhalb des aus Pumpengehäuse und Motor bestehenden Systems ist ein Öl enthaltender Raum 40, gebildet von einer gemeinsamen Wellenwanne 41, vorgesehen. In diese Wellenwanne 41 hinein ragt eine mit der Welle 2 verbundene Ölpumpe 42. Von der Ölpumpe aus erstrecken sich im einzelnen nicht dargestellte Schmiermittelkanäle zu den Stellen der Pumpe (Lager, Eingriffe der Zahnräder 23 bis 26, Simmerringe oder dergleichen), welche einer Ölschmierung bedürfen.An oil-containing space 40, formed by a common shaft trough 41, is provided below the system consisting of the pump housing and motor. An oil pump 42 connected to the shaft 2 projects into this shaft trough 41. Lubricant channels, not shown in detail, extend from the oil pump to the points of the pump (bearings, engagements of the gearwheels 23 to 26, oil seals or the like) which require oil lubrication .

Das dargestellte Ausführungsbeispiel der dreistufigen Zweiwellenvakuumpumpe ist wassergekühlt. Dazu sind in den Seitenschilden 14 und 17 Kühlwasserkanäle 43 und 44 vorgesehen. Kühlwassereinlaß und -auslaß sind mit 45 und 46 bezeichnet. Der Kühlwassereinlaß 45 ist an der untersten Stelle des Kanalsystems 43, 44 angeordnet, so daß ein einfacher Kühlwasserablaß möglich und eine vollständige Entleerung sichergestellt sind.The illustrated embodiment of the three-stage two-shaft vacuum pump is water-cooled. For this purpose, cooling water channels 43 and 44 are provided in the side plates 14 and 17. Cooling water inlet and outlet are designated 45 and 46. The cooling water inlet 45 is arranged at the lowest point of the channel system 43, 44, so that a simple cooling water drain is possible and complete emptying is ensured.

Fig. 3 zeigt einen Längsschnitt durch eine zweistufige Zweiwellenvakuumpumpe nach der Erfindung. Der Antriebsmotor 22 ist unterhalb der Pumpe angeordnet. Seine Welle 51 bildet eine axiale Verlängerung der Welle 2. Zweckmäßigerweise sind Motorwelle 51 und Pumpenwelle 2 einstückig ausgebildet. Der Antriebsmotor 22 ist wassergekühlt und dazu mit einem doppelwandigen Gehäuse 52 ausgerüstet. Der dadurch gebildete Kühlkanal 53 ist an das Kühlsystem 43 bis 46 des Pumpengehäuses angeschlossen. Die dazu erforderlichen Verbindungsleitungen sind mit 54 und 55 bezeichnet. Zwischen dem Antriebsmotor 22 und dem unteren Lagerschild 17 befinden sich die Synchronisationsräder 23, 24 und der Ölraum 40, in den die Ölpumpe 42 hineinragt. Die Ölpumpe 42 ist mit der Antriebswelle 3 gekoppelt.Fig. 3 shows a longitudinal section through a two-stage two-shaft vacuum pump according to the invention. The drive motor 22 is arranged below the pump. Its shaft 51 forms an axial extension of the shaft 2. The motor shaft 51 and pump shaft 2 are expediently formed in one piece. The drive motor 22 is water-cooled and for this purpose equipped with a double-walled housing 52. The cooling channel 53 thus formed is connected to the cooling system 43 to 46 of the pump housing. The connecting lines required for this are designated 54 and 55. The synchronization wheels 23, 24 and the oil chamber 40, into which the oil pump 42 projects, are located between the drive motor 22 and the lower end plate 17. The oil pump 42 is coupled to the drive shaft 3.

Das Ausführungsbeispiel nach Fig. 3 hat trotz axial hintereinanderliegendem Pumpengehäuse und Antriebsmotor eine kleine Bauhöhe, da zum einen Pumpe und Motor eine gemeinsame Welle haben und - wegen der Wasserkühlung - der Antriebsmotor ein Kühlgebläse nicht benötigt. Auch eine separate Motorlagerung kann entfallen. Der Kühlwassereinlaß ist möglichst weit unten am Motorgehäuse 52 angeordnet, so daß er in einfacher Weise als Kühlwasserablaß verwendet werden kann. Eine vollständige Entleerung des gesamten Kühlsystems ist gewährleistet.The embodiment according to FIG. 3 has a small overall height despite the pump housing and drive motor lying axially one behind the other, since on the one hand the pump and motor have a common shaft and - because of the water cooling - the drive motor does not require a cooling fan. A separate engine mounting can also be omitted. The cooling water inlet is arranged as far down on the motor housing 52 so that it can be used as a cooling water outlet in a simple manner. Complete drainage of the entire cooling system is guaranteed.

Beim Ausführungsbeispiel nach Fig. 4 handelt es sich um eine einstufige Zweiwellenvakuumpumpe mit daneben angeordnetem Antriebsmotor 22. Diese Anordnung hat den Vorteil, daß ein Riemen- oder Kettenantrieb (der letztere ist dargestellt) verwendet werden kann. Dazu sind die Welle 3 der Vakuumpumpe und die Welle 51 des Motors 22 mit Zahnrädern 56 und 57 ausgerüstet und über eine im einzelnen nicht dargestellte Kette miteinander verbunden. Der Vorteil dieser Lösung besteht darin, daß Drehzahlunterschiede (z. B. Antriebsmotoren mit 50 oder 60 Hz) in einfacher Weise ausgeglichen werden können. Außerdem haben Antriebe dieser Art den Vorteil einer besseren Dämpfung.The embodiment according to FIG. 4 is a single-stage two-shaft vacuum pump with a drive motor 22 arranged next to it. This arrangement has the advantage that a belt or chain drive (the latter is shown) can be used. For this purpose, the shaft 3 of the vacuum pump and the shaft 51 of the motor 22 are equipped with gear wheels 56 and 57 and connected to one another via a chain, not shown in detail. The advantage of this solution is that speed differences (e.g. drive motors with 50 or 60 Hz) can be compensated for in a simple manner. In addition, drives of this type have the advantage of better damping.

Weiterhin zeigt Fig. 4 eine Besonderheit, die sich auf die Gestaltung der Lagerung der Wellen 2, 3 im Lagerschild 14 beziehen. Mit den oberen Enden der Wellen 2, 3 sind im wesentlichen zylindrische Paßstücke 61, 62 verbunden, welche stirnseitig eine topfförmige Gestaltung 63 aufweisen. Auch die Wellenenden selbst oder die Stirnseiten der Rotoren können mit dieser topfförmigen Gestaltung 63 ausgerüstet sein. In den jeweiligen topfförmig gestalteten Raum ragt von oben ein zylindrischer Stumpf 65 hinein, der an einem Gehäusedeckel 66 befestigt ist. Das Lager 27 stützt sich mit seinem inneren Lagerring auf den festen Stumpf 65 und mit seinem äußeren Lagerring auf die Innenwand der topfförmigen Gestaltung ab. Die zylindrischen Paßstücke 61, 62 bilden mit den sie umgebenden Wandungen des Lagerschildes 14 eine Spaltdichtung, die z. B. als Labyrinthdichtung 67 (mit in den Nuten befindlichen Kolbenringen) ausgebildet sein kann. Dadurch wird eine wirksame Trennung der Lagerräume von den üblicherweise ölfreien Schöpfräumen sichergestellt.Furthermore, FIG. 4 shows a special feature which relates to the design of the mounting of the shafts 2, 3 in the end shield 14. With the upper ends of the shafts 2, 3, essentially cylindrical fitting pieces 61, 62 are connected, which have a pot-shaped design 63 on the end face. The shaft ends themselves or the end faces of the rotors can also be equipped with this cup-shaped design 63. A cylindrical stump 65, which is fastened to a housing cover 66, projects into the respective cup-shaped space from above. The bearing 27 is supported with its inner bearing ring on the fixed stump 65 and with its outer bearing ring on the inner wall of the cup-shaped design. The cylindrical adapters 61, 62 form with the surrounding walls of the bearing plate 14 a gap seal, the z. B. can be formed as a labyrinth seal 67 (with piston rings located in the grooves). This ensures an effective separation of the storage rooms from the usually oil-free delivery rooms.

Fig. 5 zeigt vergrößert eine Lagerung der zu Fig. 4 beschriebenen Art. Zur Verhinderung des Austritts von Schmiermitteln aus dem Lagerraum ist oberhalb des Lagerrings 27 ein rotierender Ring 68 vorgesehen, der den Lagerraum nach außen hin nahezu völlig verschließt. Außerdem tritt eine Zentrifugalwirkung ein. An den Ring 68 gelangendes Schmiermittel wird nach außen und damit in den Lagerraum zurückgefördert.FIG. 5 shows an enlarged bearing arrangement of the type described in relation to FIG. 4. To prevent lubricants from escaping from the storage space, a rotating ring 68 is provided above the bearing ring 27, which almost completely closes the storage space from the outside. A centrifugal effect also occurs. Lubricant reaching the ring 68 is conveyed outwards and thus back into the storage space.

Bei der ähnlich gestalteten Lagerung nach Fig. 6 ist oberhalb des Lagers 27 ein Wellendichtring 69 vorgesehen, der ebenfalls den Lagerraum verschließt. Die Dichtlippe des Wellendichtrings 68 liegt dem Stumpf 65 bei stillstehender Welle 2, 3 an. Rotiert die Welle, dann hebt sich die Dichtlippe vom Wellenstumpf 65 ab, so daß die Dichtung berührungsfrei wird.6, a shaft sealing ring 69 is provided above the bearing 27, which also closes the storage space. The sealing lip of the shaft sealing ring 68 bears against the stump 65 when the shaft 2, 3 is stationary. If the shaft rotates, then the sealing lip lifts off from the shaft end 65, so that the seal becomes contactless.

Claims (4)

  1. Multistage two-shaft vacuum pump (1) with a plurality of suction chambers (11, 12, 13), with a respective rotor pair (4, 5; 6, 7; 8, 9) disposed in each suction chamber and arranged on the two shafts (2, 3), with plates (14 to 17) which define the suction chambers and through which the shafts (2, 3) pass, and with a synchronizing gear unit which is disposed in a lateral chamber (40) and consists of two gear wheels (23, 24), one end of one of the two shafts (2, 3) being connected to a drive motor (22) and the shafts (2, 3) of the vacuum pump (1) being arranged vertically, characterised in that all the rotors are of the claw type, that the inlet openings (32, 35) and outlet openings (33, 37) of the pump stages provided with the claw-type rotor pairs (4, 5; 6, 7; 8, 9) are disposed at the end faces in the lateral plates (14 to 17), that the drive motor (22) is arranged next to the pump (1) such that its drive shaft also extends vertically, that the lateral chamber (40) with the synchronizing gear unit (23, 24) and the means (25, 26) which connect one end of one of the shafts (2, 3) to the drive motor (22) is arranged below the lower rotor pair (8, 9), that the inlet (29) of the pump (1) is disposed above the top pump stage (4, 5) and the outlet (36) of the pump (1) below the bottom stage (8, 9), and that the outer lateral plates (14, 17) are provided with cooling water channels (43, 44) which form a channel system, through which coolant flows, with a cooling water inlet (45) and outlet (46) in the lower (17) and upper lateral plate (14), respectively.
  2. Pump according to claim 1, characterised in that the inlet (29) of the pump (1) is formed as a vertical connecting piece with a horizontal connecting flange (28), and that the drive motor (22) is arranged next to the pump (1) such that its drive shaft (51) also extends vertically.
  3. Pump according to claim 1 or 2, characterised in that the gear wheels (23, 24) of the synchronizing gear unit are arranged in one plane with a gear wheel (25) on the drive shaft (51) of the motor (22), and that a further gear wheel (26) is provided to produce the drive connection.
  4. Pump according to claim 1 or 2, characterised in that the shaft (51) of the drive motor (22) is connected to one of the shafts (2, 3) of the pump (1) via a belt, toothed belt or chain drive.
EP87107089A 1987-05-15 1987-05-15 Positive-displacement two-shaft vacuum pump Expired - Lifetime EP0290662B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP87107089A EP0290662B1 (en) 1987-05-15 1987-05-15 Positive-displacement two-shaft vacuum pump
EP90116358A EP0409287B1 (en) 1987-05-15 1987-05-15 Vacuum pump with displacement space
DE8787107089T DE3785192D1 (en) 1987-05-15 1987-05-15 TWO-SHAFT VACUUM PUMP WITH SCHOEPFRAUM.
US07/193,659 US4940398A (en) 1987-05-15 1988-05-13 Twin-shaft, multiple-stage vacuum pump with the shafts vertically disposed
JP63115014A JPS63302194A (en) 1987-05-15 1988-05-13 Biaxial vacuum pump with suction chamber
JP007947U JPH10192U (en) 1987-05-15 1997-08-05 Multi-stage two-shaft vacuum pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87107089A EP0290662B1 (en) 1987-05-15 1987-05-15 Positive-displacement two-shaft vacuum pump

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP90116358.4 Division-Into 1990-08-27

Publications (2)

Publication Number Publication Date
EP0290662A1 EP0290662A1 (en) 1988-11-17
EP0290662B1 true EP0290662B1 (en) 1993-03-31

Family

ID=8196996

Family Applications (2)

Application Number Title Priority Date Filing Date
EP90116358A Expired - Lifetime EP0409287B1 (en) 1987-05-15 1987-05-15 Vacuum pump with displacement space
EP87107089A Expired - Lifetime EP0290662B1 (en) 1987-05-15 1987-05-15 Positive-displacement two-shaft vacuum pump

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP90116358A Expired - Lifetime EP0409287B1 (en) 1987-05-15 1987-05-15 Vacuum pump with displacement space

Country Status (4)

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US (1) US4940398A (en)
EP (2) EP0409287B1 (en)
JP (2) JPS63302194A (en)
DE (1) DE3785192D1 (en)

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Also Published As

Publication number Publication date
JPS63302194A (en) 1988-12-09
EP0409287B1 (en) 1994-04-06
JPH10192U (en) 1998-08-25
EP0290662A1 (en) 1988-11-17
EP0409287A1 (en) 1991-01-23
US4940398A (en) 1990-07-10
DE3785192D1 (en) 1993-05-06

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