EP0314819B1 - Pompe à vide à deux arbres avec au moins un passage de liaison entre les chambres des paliers - Google Patents

Pompe à vide à deux arbres avec au moins un passage de liaison entre les chambres des paliers Download PDF

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Publication number
EP0314819B1
EP0314819B1 EP19870116069 EP87116069A EP0314819B1 EP 0314819 B1 EP0314819 B1 EP 0314819B1 EP 19870116069 EP19870116069 EP 19870116069 EP 87116069 A EP87116069 A EP 87116069A EP 0314819 B1 EP0314819 B1 EP 0314819B1
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EP
European Patent Office
Prior art keywords
bearing
chamber
pump
shaft pump
suction
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
EP19870116069
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German (de)
English (en)
Other versions
EP0314819A1 (fr
Inventor
Heinz Frings
Hans-Peter Dr. Kabelitz
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 EP19870116069 priority Critical patent/EP0314819B1/fr
Priority to DE8787116069T priority patent/DE3774711D1/de
Publication of EP0314819A1 publication Critical patent/EP0314819A1/fr
Application granted granted Critical
Publication of EP0314819B1 publication Critical patent/EP0314819B1/fr
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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
    • 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
    • F04C29/0021—Systems for the equilibration of forces acting on the pump
    • F04C29/0028—Internal leakage control

Definitions

  • the invention relates to a twin-shaft vacuum pump with a pump chamber housing ring, with two bearing disks attached to it laterally, each with a pump chamber sealing ring between the end faces of the housing ring and the bearing plates, with bearing chamber housings flanged to the bearing discs from the outside and with at least one Passing through bearing disks, connecting the storage chambers together.
  • This channel has the task of avoiding pressure differences in the oil-containing storage chambers. It is expedient to provide two connecting channels, one of which is arranged above and the other below the oil level in the bearing chambers. Pressure and oil level compensation are then ensured.
  • a two-shaft vacuum pump of this type are known from US-A-2014932 and DE-PS 19 39 717.
  • two channels are provided, one of which is designed as a bore in the housing ring and the other as a gas and oil-tight tube which is guided through the Roots work chamber.
  • the oil escaping from the leaks gets into the scooping chamber and contaminates the pumped medium.
  • twin-shaft vacuum pumps in particular Roots pumps, are preferably used where oil-free pumping is absolutely required. In the event of a leak in the area of the connecting channels passing through the bearing washers between the lateral bearing chambers, the pump loses its ability to deliver oil-free.
  • the object of the present invention is to ensure that the scooping chamber is free of oil even in the event of a leak in the area of the passage points of the connecting channels through the bearing washers.
  • this object is achieved in that the point of passage of the connecting channel through the bearing washers lies outside of the suction chamber sealing rings. If leaks occur in a twin-shaft vacuum pump designed in this way in the area of the passage point of the connecting channels, the pumping chamber sealing rings nevertheless prevent oil from escaping into the pumping chamber. The leak oil occurs to the outside, which has the advantage that the leak can be recognized early. With the twin-shaft vacuum pump according to the state of the art, it was only possible to detect a leak from the contamination of the pumped medium.
  • passage points of the connecting channel are expediently also outside the sealing rings, which seal the bearing chamber housings from the bearing disks. This measure and also the arrangement of the passage points of the connecting channel in one of the corners of the cross section of the pump enable a compact construction. "Corners” are to be understood to mean those areas which lie between the oval cross section of the scoop and the circumscribed rectangle.
  • the arrangement of one or both connecting channels in the corners of the pump also has the advantage that a pipe forming the connecting channel does not have to be passed through the inlet connection of the pump, as in the prior art.
  • a tube of this type In the inlet port of the pump, a tube of this type must be designed so that it can withstand the often aggressive fluids. This requirement does not exist in the pump according to the invention, since the connecting pipes do not penetrate the scoop space or inlet or outlet connection.
  • the two-shaft pump 1 (Roots pump) shown in the figures essentially comprises the following components: pump chamber housing ring 2, bearing disks 3 and 4 and rotors 5 and 6 (FIG. 2), which are rotatably supported with their shaft ends 7 and 8 in the bearing disks 3 and 4 are.
  • pump chamber housing ring 2 In the scooping chamber 9 there are two rotors each with a two-shaft vacuum pump, which are approximately 8-shaped (Roots pump), claw-shaped (Northey pump). can be helical (screw pump) or similar. Overall, there is an essentially oval cross section. In the bearing disks 3 and 4, two stub shafts 7 and 8 are supported.
  • bearing chambers 11 and 12 are partially filled with oil and contain, in addition to the bearings 15 and 16, synchronization wheels 17, spray disks 18, 19 etc.
  • one of the stub shafts 8 is connected to the drive shaft 21.
  • Screws 22, of which a total of twelve are arranged distributed over the circumference, are used to produce the connections between the pump chamber housing ring 2 and the bearing disks 3, 4 on the one hand and between the bearing disks 3, 4 and the bearing chamber housings 13, 14 on the other hand.
  • the pump chamber seals 23, 24 Between the end faces of the pump chamber housing 2 and the bearing disks 3, 4 are the pump chamber seals 23, 24.
  • the seals 25, 26 are arranged between the bearing disks 3, 4 and the bearing chamber housings 13, 14.
  • the bearing chambers 11, 12 are connected to one another via the channel generally designated 31.
  • This channel 31 comprises a pipe 32 which is guided outside the scoop housing ring 2 and whose end faces end in the region of the sealing surfaces between the bearing chamber housings 13 and 14 and the bearing disks 3 and 4, respectively.
  • the flanges of the bearing chamber housings 13, 14 are provided with bores 33 and 34 concentrically with the pipe 32.
  • the sealing rings 35 and 36 serve to seal the end faces of the tube 32 to the outside.
  • the passage points of the tube 32 through the bearing disks 3 and 4 are outside the chamber seals 23 and 24. This ensures that in the event of a leak in the connecting channel 31, for. B. in the area of the seals 35, 36, emerging oil can not get into the scooping chamber 9. Furthermore, the Passage points of the tube 32 through the bearing disks 3, 4 also outside of the seals 25 and 26 between the bearing disks 3, 4 and the bearing chamber housings 13, 14.
  • FIG. 2 shows a section at the line II-II in FIG. 1. It lies in one of the lower corners of the substantially oval cross section.
  • the bearing chamber housing 13 is provided with a corresponding shape in this area.
  • FIG. 2 shows yet another connecting channel 37, specifically in the corner diagonal to the corner with the connecting channel 31.
  • Fig. 1 can be viewed as a longitudinal section through the Roots pump 1 along the lines I-I in Fig. 2.
  • the connecting channel 37 is therefore not visible in FIG. 1.
  • the arrangement of the connecting channels 31, 37 in corners arranged diagonally to one another causes the connecting channel 31 to lie below the oil level in the bearing chambers 11, 12, while the connecting channel 37 is located above the oil level.
  • the connection flanges 38, 39 shown in FIG. 2 show that the Roots pump 2 shown has a vertical direction of passage. If the Roots pump is rotated by 90 ° about its longitudinal axis in order to achieve a horizontal passage position, then one of the two connecting channels 31, 37 is also arranged below and the other above the oil level in the bearing chambers 11, 12.
  • the invention is applicable to all twin-shaft pumps - regardless of the working principle - in which pressure and / or oil compensation between the side chambers is desired.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (8)

  1. Pompe à deux arbres (1) comportant un carter annulaire de chambre de compression (2) avec deux disques de palier (3, 4) fixés latéralement à celui-ci, avec à chaque fois une garniture d'étanchéité (23 ou 24) de la chambre de compression entre les côtés frontaux du carter annulaire (2) et les disques de palier (3 ou 4), avec des carters de chambre de palier (13, 14) bridés de l'extérieur sur les disques de palier et avec au moins un canal (31 ou 37) qui traverse les disques de palier et qui relie ensemble les chambres de palier (11, 12), caractérisée en ce que les sites de passage du canal de liaison (31 ou 37) à travers les disques de palier (3, 4) sont situés à l'extérieur des garnitures d'étanchéité (23, 24) de la chambre de compression.
  2. Pompe à deux arbres (1) selon la revendication 1, dans laquelle des bagues d'étanchéité (25, 26) sont prévues entre les disques de palier (3, 4) et les carters de chambre de palier (13, 14), caractérisée en ce que les sites de passage du canal de liaison (31 ou 37) à travers les disques de palier (3, 4) sont situés à l'extérieur de ces bagues d'étanchéité (25, 26).
  3. Pompe à deux arbres (1) selon la revendication 1 ou 2, caractérisée en ce que les sites de passage du canal de liaison (31 ou 37) sont situés dans l'un des angles de la section transversale de la pompe (1).
  4. Pompe à deux arbres (1) selon la revendication 3, caractérisée en ce qu'il est prévu deux canaux de liaison (31, 37) dont les sites de passage sont disposés à chaque fois dans des angles situés en diagonale l'un par rapport à l'autre.
  5. Pompe à deux arbres (1) selon l'une des revendications précédentes, caractérisée en ce que les canaux de liaison (31, 37) sont constitués par des tubes (32).
  6. Pompe à deux arbres (1) selon la revendication 5, caractérisée en ce que les côtés frontaux des tubes (32) qui constituent les canaux de liaison aboutissent dans la surface d'étanchéité entre les disques de palier (3, 4) et les carters de chambre de palier (13, 14).
  7. Pompe à deux arbres (1) selon la revendication 6, caractérisée en ce que les côtés frontaux des tubes de liaison (32) sont munis d'une bague d'étanchéité (35, 36).
  8. Pompe à deux arbres (1) selon les revendications 5 à 7, caractérisée en ce que les canaux de liaison (31, 37) qui forment les tubes (32) s'étendent à l'extérieur du carter annulaire de la chambre de compression (2).
EP19870116069 1987-10-31 1987-10-31 Pompe à vide à deux arbres avec au moins un passage de liaison entre les chambres des paliers Expired - Lifetime EP0314819B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19870116069 EP0314819B1 (fr) 1987-10-31 1987-10-31 Pompe à vide à deux arbres avec au moins un passage de liaison entre les chambres des paliers
DE8787116069T DE3774711D1 (de) 1987-10-31 1987-10-31 Zweiwellenvakuumpumpe mit mindestens einer verbindungsleitung zwischen den lagerkammern.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19870116069 EP0314819B1 (fr) 1987-10-31 1987-10-31 Pompe à vide à deux arbres avec au moins un passage de liaison entre les chambres des paliers

Publications (2)

Publication Number Publication Date
EP0314819A1 EP0314819A1 (fr) 1989-05-10
EP0314819B1 true EP0314819B1 (fr) 1991-11-21

Family

ID=8197411

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870116069 Expired - Lifetime EP0314819B1 (fr) 1987-10-31 1987-10-31 Pompe à vide à deux arbres avec au moins un passage de liaison entre les chambres des paliers

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EP (1) EP0314819B1 (fr)
DE (1) DE3774711D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5452251A (en) 1992-12-03 1995-09-19 Fujitsu Limited Semiconductor memory device for selecting and deselecting blocks of word lines
JP3408309B2 (ja) * 1994-02-10 2003-05-19 株式会社東芝 密閉形コンプレッサならびにこのコンプレッサを用いた冷凍装置
GB0709529D0 (en) * 2007-05-18 2007-06-27 Boc Group Plc Vacuum pump
DE102010045880A1 (de) * 2010-09-17 2012-03-22 Pfeiffer Vacuum Gmbh Vakuumpumpe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2014932A (en) * 1933-03-17 1935-09-17 Gen Motors Corp Roots blower
DE1939717B2 (de) * 1969-08-05 1978-03-23 Leybold-Heraeus Gmbh & Co Kg, 5000 Koeln Waelzkolbenpumpe
GB1599413A (en) * 1978-04-14 1981-09-30 Carveth D Oil-injected rotary compressors
DE2948993A1 (de) * 1979-12-05 1981-06-11 Karl Prof.Dr.-Ing. 3000 Hannover Bammert Verdichter, insbesondere schraubenverdichter, mit schmiermittelkreislauf
US4439121A (en) * 1982-03-02 1984-03-27 Dunham-Bush, Inc. Self-cleaning single loop mist type lubrication system for screw compressors

Also Published As

Publication number Publication date
DE3774711D1 (de) 1992-01-02
EP0314819A1 (fr) 1989-05-10

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