EP0107691B1 - Abdichtung für drehkolbenpumpe - Google Patents

Abdichtung für drehkolbenpumpe Download PDF

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Publication number
EP0107691B1
EP0107691B1 EP83901375A EP83901375A EP0107691B1 EP 0107691 B1 EP0107691 B1 EP 0107691B1 EP 83901375 A EP83901375 A EP 83901375A EP 83901375 A EP83901375 A EP 83901375A EP 0107691 B1 EP0107691 B1 EP 0107691B1
Authority
EP
European Patent Office
Prior art keywords
rolling piston
pump
compressor according
chambers
piston compressor
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
Application number
EP83901375A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0107691A1 (de
Inventor
Udo Segebrecht
Christian Dahmlos
Erwin Holthusen
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.)
Sihi GmbH and Co KG
Original Assignee
Sihi GmbH and Co KG
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 Sihi GmbH and Co KG filed Critical Sihi GmbH and Co KG
Priority to AT83901375T priority Critical patent/ATE29164T1/de
Publication of EP0107691A1 publication Critical patent/EP0107691A1/de
Application granted granted Critical
Publication of EP0107691B1 publication Critical patent/EP0107691B1/de
Expired 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
    • 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

Definitions

  • the invention relates to Roots compressors, preferably Roots vacuum pumps, the shafts of which are mounted at least on one side in a partition or a separating housing between the pumping chamber and the gear chamber which is partly filled with oil and is provided with sealing elements.
  • the seal between the pump chamber and the gearbox serves to prevent the conveying gas from entering the gearbox chamber - especially for compressors that work against excess pressure - and also to prevent the oil from entering the gearbox chamber, which is used here to lubricate the gears serves to prevent in the scoop.
  • Simple shaft seals in the form of lip seals, rectangular ring seals or, as in the embodiment according to the invention, by means of mechanical seals are known here.
  • Lip seals can only be used at low pressure differences due to the low temperature load, the susceptibility to faults and the service life. This also applies to the arrangement according to DE-A 3007267, which shows a pump of the type mentioned at the outset, in which the sealing elements in each partition are formed by a pair of lip seals arranged opposite one another, the space between them being provided by means of a separately provided pump via a suitable coolant circuit is flushed with cooling medium.
  • a separate cooling circuit is necessary because otherwise the temperature at the sealing lips will increase too much.
  • the disadvantage that the life of the seals is very limited due to the considerable pressure differences is not avoided by this arrangement, which is also very expensive because of the separate cooling circuit and the separate pump, which obviously also has a separate drive.
  • Rectangular seals still allow a small amount of gas to be exchanged between the pumping chamber and the gearbox, so they are not absolutely leak-proof and, due to the limited choice of materials, they cannot always be used against somewhat aggressive media.
  • the invention has for its object to provide a significant simplification, which is achieved according to the invention in that the seal between the pump chamber and the gear chamber is carried out in a manner known per se by mechanical seal and that a liquid pump designed as a self-priming side channel pump within a gear chamber of the compressor on the Shaft of a Roots is arranged and the pressure side of the liquid pump is directly connected to the mechanical seal spaces.
  • the device of the US-A No. 2178425 to provide no information whatsoever for the further features of the invention, to design the liquid pump as a self-priming side channel pump and to arrange it within a gear chamber of the compressor.
  • the liquid pump is also expedient, as proposed according to the invention, to design the liquid pump as a self-priming side channel pump.
  • This pump with the appropriate arrangement of suction and pressure slots, is always able to draw in the oil even when the liquid level in the gear chamber is below the liquid pump. If a non-self-priming pump is used, appropriate valves on the suction or pressure side in the feed and discharge lines of the liquid pump would have to ensure that no air can enter this liquid pump when the Roots Compressor is at a standstill, otherwise the pump may not be in operation when restarted It is able to suck in from a lower oil level and thus become functional again.
  • Roots compressors are usually mounted on both sides, it is also expedient according to the invention to connect the two gear spaces to one another in the geodetically lower region, so that a backflow of part of the oil from the second gear space into the gear space in which the liquid pump works is made possible.
  • This connection can be provided inside or outside the pump.
  • a further particularly advantageous and simple embodiment is seen according to the invention in that the filling hole for the liquid pump - which in any case has to be at least partially filled with liquid before the first start-up - and the filling hole for the gear housing are combined.
  • this advantageous combination can only be used if a side channel pump is used as a liquid pump, since then no corresponding shut-off or check valves are arranged in the feed and discharge lines of this pump, which are subsequently necessary for the proper operation of the liquid pump.
  • FIG. 1 shows a schematic longitudinal section
  • FIG. 2 shows a schematic cross section through a Roots compressor with flow through in the vertical direction with the shafts being supported on both sides.
  • 1 and 2 are the two shafts on which the rotary pistons 3 and 4 are attached.
  • the housing 5 forms, together with the rotary pistons, the scooping space.
  • the inlet connector 6 and the outlet connector 7 are arranged on the housing 5.
  • Partitions or housings 8 and 9 with the bearings 10 and 11 are located to the side of the housing.
  • the shaft bushings between the pumping chamber and the gear chambers 12 and 13 are sealed by mechanical seals 14 and 15.
  • the liquid pump 16 is located on one compressor shaft.
  • the suction port of the liquid pump is immersed in the gear oil.
  • the oil is supplied to the mechanical seal spaces via channels 17 and / or outer pipelines 18.
  • the two gear spaces are connected to one another by pipelines or channels 19 so that the liquid level in both gear spaces can be equalized.
  • a heat exchanger and an oil reservoir can be switched into the liquid circuit.
  • the heat exchanger or the oil reservoir is shown schematically with the designation 20 in a pipe without wanting to specify a particular location.
  • the oil is expediently fed to the seals on their transmission side so that it can flow freely into the transmission spaces and a sufficient current for cooling flows back from the gear chamber 13 via the cooler 20 to the gear chamber 12 and thus to the suction side of the pump 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Closures For Containers (AREA)
EP83901375A 1982-05-06 1983-05-03 Abdichtung für drehkolbenpumpe Expired EP0107691B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83901375T ATE29164T1 (de) 1982-05-06 1983-05-03 Abdichtung fuer drehkolbenpumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3216990 1982-05-06
DE3216990A DE3216990A1 (de) 1982-05-06 1982-05-06 Waelzkolbenpumpe

Publications (2)

Publication Number Publication Date
EP0107691A1 EP0107691A1 (de) 1984-05-09
EP0107691B1 true EP0107691B1 (de) 1987-08-26

Family

ID=6162896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83901375A Expired EP0107691B1 (de) 1982-05-06 1983-05-03 Abdichtung für drehkolbenpumpe

Country Status (10)

Country Link
EP (1) EP0107691B1 (da)
JP (1) JPS59500825A (da)
AU (1) AU1516583A (da)
DE (2) DE3216990A1 (da)
DK (1) DK153174C (da)
ES (1) ES271911Y (da)
IT (1) IT1212953B (da)
NO (1) NO834827L (da)
WO (1) WO1983004075A1 (da)
ZA (1) ZA833087B (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106930945A (zh) * 2015-12-29 2017-07-07 罗伯特·博世有限公司 增压器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787831A (en) * 1983-09-20 1988-11-29 Air Products And Chemicals, Inc. Dual seal system for roots blower
DE3344953A1 (de) * 1983-12-13 1985-06-20 Leybold-Heraeus GmbH, 5000 Köln Zweiwellen-vakuumpumpe mit getrieberaum-evakuierung
DE3540959A1 (de) * 1984-12-22 1986-07-03 Leybold-Heraeus GmbH, 5000 Köln Oelfoerdereinrichtung fuer vakuumpumpen
DE3574274D1 (en) * 1985-04-24 1989-12-21 Leybold Ag Multistage vacuum pump
DE102014101113A1 (de) * 2014-01-30 2015-07-30 Pfeiffer Vacuum Gmbh Vakuumpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178425A (en) * 1937-02-18 1939-10-31 Gen Electric Refrigerating machine

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB217575A (en) * 1923-06-11 1924-10-16 Sulzer Ag Improvements in or relating to rotary compressors
DE471012C (de) * 1925-06-06 1929-03-19 Der Maschinenfabriken Escher A Einrichtung zum Abdichten von insbesondere zum Foerdern von Gasen und Daempfen bestimmten Maschinen mit umlaufenden Wellen
DE684266C (de) * 1937-01-01 1939-11-24 Bosch Gmbh Robert Regelvorrichtung fuer das Ladegeblaese einer Brennkraftmaschine
US2620124A (en) * 1946-12-26 1952-12-02 Gen Motors Corp Compressor apparatus
US2679412A (en) * 1950-03-24 1954-05-25 Read Standard Corp Seal
US2677944A (en) * 1950-12-01 1954-05-11 Alonzo W Ruff Plural stage refrigeration apparatus
GB734893A (en) * 1953-05-28 1955-08-10 Harry Skeet Broom Improvements in or relating to rotary air compressors
DE1021530B (de) * 1955-01-17 1957-12-27 Leybolds Nachfolger E Drehkolbengeblaese
US3292847A (en) * 1964-11-03 1966-12-20 Dresser Ind Lubricant sealing means for rotary positive displacement pump
US3556697A (en) * 1969-04-10 1971-01-19 Ingersoll Rand Co Sealing arrangement for vacuum pump
DE1939717B2 (de) * 1969-08-05 1978-03-23 Leybold-Heraeus Gmbh & Co Kg, 5000 Koeln Waelzkolbenpumpe
GB1378543A (en) * 1971-07-08 1974-12-27 Borg Warner Rotary compressor of sliding vane type
GB1552385A (en) * 1975-05-13 1979-09-12 Maekawa Seisakusho Kk Device for compressing or expanding a gas or for pumping a liquid
DE3007267A1 (de) * 1980-02-27 1981-09-03 Leybold Heraeus Gmbh & Co Kg Wellendichtung fuer waelzkolbenpumpen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178425A (en) * 1937-02-18 1939-10-31 Gen Electric Refrigerating machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106930945A (zh) * 2015-12-29 2017-07-07 罗伯特·博世有限公司 增压器

Also Published As

Publication number Publication date
ZA833087B (en) 1984-01-25
ES271911U (es) 1984-08-01
DK3984D0 (da) 1984-01-05
NO834827L (no) 1983-12-27
WO1983004075A1 (fr) 1983-11-24
JPS59500825A (ja) 1984-05-10
IT1212953B (it) 1989-12-07
DK153174B (da) 1988-06-20
EP0107691A1 (de) 1984-05-09
IT8309417A0 (it) 1983-05-06
ES271911Y (es) 1985-02-16
AU1516583A (en) 1983-12-02
DE3216990A1 (de) 1983-11-10
DE3373202D1 (en) 1987-10-01
DK3984A (da) 1984-01-05
DK153174C (da) 1988-12-12

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