EP0602357B1 - Zahnradpumpe - Google Patents

Zahnradpumpe Download PDF

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Publication number
EP0602357B1
EP0602357B1 EP93117448A EP93117448A EP0602357B1 EP 0602357 B1 EP0602357 B1 EP 0602357B1 EP 93117448 A EP93117448 A EP 93117448A EP 93117448 A EP93117448 A EP 93117448A EP 0602357 B1 EP0602357 B1 EP 0602357B1
Authority
EP
European Patent Office
Prior art keywords
bearing
labyrinth seal
casing
gear pump
housing
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
EP93117448A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0602357A1 (de
Inventor
Roger Stehr
Urs Boelsterli
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.)
Maag Pump Systems AG
Original Assignee
Maag Pump Systems 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 Maag Pump Systems AG filed Critical Maag Pump Systems AG
Publication of EP0602357A1 publication Critical patent/EP0602357A1/de
Application granted granted Critical
Publication of EP0602357B1 publication Critical patent/EP0602357B1/de
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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps

Definitions

  • the present invention relates to a gear pump according to the preamble of claim 1. It is known in the case of gear pumps of the type mentioned to seal rotor shafts guided outwards from the housing by means of labyrinth seals.
  • the gear pump rotor under consideration is rotatably mounted on one of the housing covers and also on the opposite one, but is carried out to the outside there by a bearing insert.
  • a sealing arrangement acts between the gear and the bushing on the mentioned housing cover between the housing and the rotor shaft and prevents the medium from escaping axially against the bushing.
  • a gear pump of the type mentioned is known from DE-OS 4 125 128.
  • the shaft of one of the gear pump rotors, which runs through to the outside, is axially advancing to the outside and is only slidably supported in the pump housing and then penetrates the side wall of the pump housing.
  • a relief zone is provided there.
  • a sealing housing is placed on the side wall of the pump housing, in which further sealing devices are arranged for the drive shaft that is led through to the outside.
  • a leak zone is provided in the sealing housing, followed by a feed thread first labyrinth seal, then an intermediate zone in the form of an annular groove, another labyrinth seal in the form of a conveying thread, and a collecting space with an outlet.
  • An annular groove with a sealing ring is provided in the sealing housing following the collecting space. Furthermore, an annular chamber is formed in the sealing housing, in which a barrier medium is received.
  • a flange is also mounted on the sealing housing mounted on the side wall of the housing or the housing cover, axially on the outside, with a further labyrinth seal designed as a sealing thread, which prevents the barrier medium from escaping into the environment.
  • the bearing of the shaft as in the pump according to DE-OS 4 125 128, is arranged axially on the inside in a separate bearing section and the seal axially adjoins the bearing section, a clear separation of functions between shaft bearing and sealing function is achieved, so that the bearing shells can be designed without interference from a groove profile and, on the other hand, the seal can only correspond to its inherent functions.
  • the labyrinth seal is incorporated according to the invention directly into the wall of the shaft receiving opening on the housing cover.
  • the aim is to manufacture the labyrinth sealing shells from a different material, for example from ceramic or special steel, and not from the same material as the housing cover, for example for reasons of wear, then it is proposed according to claim 2, by pressing, welding into the shaft receiving opening on the housing cover or glue to provide a sleeve with the labyrinth seal. Otherwise, a particularly simple solution is achieved in that the labyrinth seal is incorporated directly into the wall of the shaft receiving opening on the housing cover.
  • the effect of the labyrinth seal can be adapted to the medium being conveyed.
  • a further preferred embodiment variant is distinguished by the wording of claim 5.
  • the gear pump which is not shown in its details, has, according to FIG. 1, a central housing part 9, to which a lateral housing part 91 is attached at the end face by means of screw bolts 25.
  • the rotors 3, which are designed as meshing gears, run around inside the housing, one of which is driven by the shaft 5.
  • the lateral housing part 91 is provided with an opening 27 for the passage of the shaft 5 of the rotor 3, which forms a bearing section with bearing shells 29 for the shaft 5.
  • the housing cover 7 is fastened axially on the lateral housing part 91 by means of screw bolts 11, which defines a corresponding bore 31 for the shaft 5 with a sealing section. A bushing 33 is let into the bore 31 for the shaft 5.
  • the sleeve 33 made of a material that differs from the material of the housing cover 7, for example ceramic, has on its inside the labyrinth seal 21, as shown in dashed lines, preferably in the form of a threaded shaft seal.
  • the bushing 33 is anchored in the bore 31 of the housing cover 7 in a non-detachable manner, for example in a firmly bonded or non-positive manner.
  • the bearing section 27, 29 and the sealing section 21, 31 are structurally and functionally separate compared to previously known designs. This enables the use of materials that are optimally matched to the respective function (bearings or seals). A surface seal only has to be ensured between the housing cover 7 and the housing part 91. The problem of such sealing surfaces between the sleeve 33 and the housing cover 7 is eliminated.
  • FIG. 2 shows a further preferred and simplified shaft bushing, in which, based on the embodiment according to FIG. 1, the labyrinth seal 21 is worked directly into the housing cover 7 or its bore.
  • the housing cover 7 advantageously has a channel system 35 for a cooling medium, which, as shown, is preferably closed with an end plate 35a.
  • the effect of the labyrinth seal can thus be optimally adapted to the material being conveyed.
  • FIG. 3 shows: In a one-piece end plate 7a, which is anchored to the housing part 9 by means of screw bolts 11a , Both labyrinth seal 21 and the bearing shells 29 of the bearing section are arranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP93117448A 1992-12-16 1993-10-28 Zahnradpumpe Expired - Lifetime EP0602357B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9217162U DE9217162U1 (de) 1992-12-16 1992-12-16 Zahnradpumpe
DE9217162U 1992-12-16

Publications (2)

Publication Number Publication Date
EP0602357A1 EP0602357A1 (de) 1994-06-22
EP0602357B1 true EP0602357B1 (de) 1997-08-06

Family

ID=6887187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93117448A Expired - Lifetime EP0602357B1 (de) 1992-12-16 1993-10-28 Zahnradpumpe

Country Status (4)

Country Link
US (1) US5462420A (ja)
EP (1) EP0602357B1 (ja)
JP (1) JPH0749088A (ja)
DE (2) DE9217162U1 (ja)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2170792C (en) * 1995-04-26 2002-06-25 Jason J. Hill Anti-leakage device
US7137789B2 (en) * 1997-07-18 2006-11-21 Rpm Industries, Inc. Vent for reducing seal pressure in pump assembly
US6544008B1 (en) * 1997-07-18 2003-04-08 John K. Apostolides Internal vent for reducing seal pressure in prelubrication pump assembly
US6708710B1 (en) * 1997-10-30 2004-03-23 Rpm Industries, Inc. Vehicle fluid change apparatus and method
US7150286B2 (en) * 1997-10-30 2006-12-19 Rpm Industries, Inc. Methods and systems for performing, monitoring and analyzing multiple machine fluid processes
US9062575B2 (en) * 1997-10-30 2015-06-23 RPM Industries, LLC Methods and systems for performing, monitoring and analyzing multiple machine fluid processes
US6988506B1 (en) 1997-10-30 2006-01-24 Rpm Industries, Inc. Fluid transfer system
CN1120251C (zh) * 1998-12-04 2003-09-03 巴马格股份公司 纺丝泵
ITMO20010108A1 (it) * 2001-05-29 2002-11-29 Rossi Motoriduttori Spa Dispositivo di tenuta dinamica per riduttore
ITMI20020263A1 (it) * 2002-02-12 2003-08-12 Alfatech Srl Pompa per il trasporto di masse fuse di polimeri ed elastomeri
US20040070152A1 (en) * 2002-08-05 2004-04-15 Oehman Robert E. Ventilated pump shaft seal
US6853954B2 (en) * 2002-09-24 2005-02-08 John K. Apostolides Methods and systems for collecting and processing data in association with machine operation and maintenance
JP6589225B2 (ja) * 2016-01-18 2019-10-16 三菱重工コンプレッサ株式会社 シール装置及び回転機械

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1072421A (en) * 1911-01-11 1913-09-09 Brown Lipe Gear Co Lubricant-retaining means.
DE1553133A1 (de) * 1966-12-23 1970-07-30 Maag Zahnraeder & Maschinen Ag Hochdruck-Zahnradpumpe
US3945779A (en) * 1973-08-30 1976-03-23 Robert Bosch Gmbh Bearings for the trunnions of gears in gear pumps or the like
US3976405A (en) * 1974-10-29 1976-08-24 Cominco Ltd. Pump
US4293291A (en) * 1977-12-19 1981-10-06 General Signal Corporation Gear pump with improved shaft seal
US4336213A (en) * 1980-02-06 1982-06-22 Fox Steve A Plastic extrusion apparatus and method
US4471963A (en) * 1984-01-09 1984-09-18 Luwa Corporation Sealing member for rotating shaft and method of sealing therewith
GB2202005B (en) * 1987-03-12 1990-11-07 Ssp Pumps Pump
DE4125128C2 (de) * 1990-08-10 1994-11-24 Barmag Barmer Maschf Zahnradpumpe

Also Published As

Publication number Publication date
EP0602357A1 (de) 1994-06-22
US5462420A (en) 1995-10-31
DE59307068D1 (de) 1997-09-11
DE9217162U1 (de) 1993-03-25
JPH0749088A (ja) 1995-02-21

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