EP0643223B1 - Procédé et dispositif d'étanchéité de traversée d'arbre pour pompes à engrenages - Google Patents

Procédé et dispositif d'étanchéité de traversée d'arbre pour pompes à engrenages Download PDF

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Publication number
EP0643223B1
EP0643223B1 EP93111510A EP93111510A EP0643223B1 EP 0643223 B1 EP0643223 B1 EP 0643223B1 EP 93111510 A EP93111510 A EP 93111510A EP 93111510 A EP93111510 A EP 93111510A EP 0643223 B1 EP0643223 B1 EP 0643223B1
Authority
EP
European Patent Office
Prior art keywords
shaft
seal
medium
blocking fluid
sealing
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
EP93111510A
Other languages
German (de)
English (en)
Other versions
EP0643223A1 (fr
Inventor
Roger Stehr
Martin Schaich
Eduard Mischler
Christian Schmid
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
Maag Pump Systems Textron 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, Maag Pump Systems Textron AG filed Critical Maag Pump Systems AG
Priority to EP93111510A priority Critical patent/EP0643223B1/fr
Priority to AT93111510T priority patent/ATE163074T1/de
Priority to DE59308121T priority patent/DE59308121D1/de
Publication of EP0643223A1 publication Critical patent/EP0643223A1/fr
Application granted granted Critical
Publication of EP0643223B1 publication Critical patent/EP0643223B1/fr
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
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids

Definitions

  • the present invention relates to a method according to Claim 1, a tight shaft bushing according to claim 2 and a gear pump Claim 7.
  • a method of sealing a shaft bushing into one medium-filled space, in which the pressure is a function of the Shaft speed and the medium is a Newtonian or is not Newtonian liquid, the viscosity of which is temperature-dependent is known from DE-OS-41 25 128. It describes a gear pump shaft bushing. Especially intended for the promotion of polymer melts, On the one hand, the aim is to prevent ambient air from entering enters the pumping chamber of the pump, both under operating as well as under standstill conditions.
  • a leakage zone designed as an annular chamber provided that through a closable outlet in the Environment can be emptied.
  • a subsequently envisaged Labyrinth seal with thread conveying direction acting against the leakage space starts from an intermediate annulus to which connects a labyrinth seal that promotes the opposite finally into another collecting room, can be emptied to the outside, flows out.
  • the grease supply seal then follows or the sealing liquid seal.
  • a gear pump with the mentioned shaft seal according to the invention is distinguished by the wording of claim 7.
  • the present invention is based on the knowledge that the sealing mechanisms for the operating states “rotating Shaft “and” standstill "are to be separated and that, as below to explain the viscosity behavior of the one-sided the implementation of the medium at hand can be exploited.
  • Fig. 1 is a implementation of a shaft 1 of a first space U is shown in a second M, in which the latter a Newtonian or non-Newtonian liquid is.
  • the space corresponds to a gear pump with a plain bearing M the axially outer plain bearing gap before the seal begins.
  • the pressure p in the room M present Medium depends on the speed n of the shaft and the viscosity ⁇ of this medium is known to depend on the temperature ⁇ .
  • a Barrier liquid seal 7 is provided. Their effect is from Shaft operation independent. But it generally has to be ensured be that no medium from level 3 in the Area of the sealing liquid seal 7 arrives and this ineffective makes. This is not the case when the waves are at a standstill ensured because the sealing level 3 is only essential reduced scope is effective.
  • the barrier liquid S is now also used as Cooling medium for the adjacent area of shaft 1 and Seal level 3 is used, which means the cooling Viscosity ⁇ des especially when the shaft is stationary in the Level 3 medium is increased, making the necessary Sealing effect at stage 3 ensured despite shaft standstill is.
  • Fig. 2 is a in a simplified sectional view the inventive method working Shaft bushing, especially on a gear pump for Polymer melts, shown.
  • the shaft 1 with the bearing block 11, gear side, defines the Storage gap space, to which, in a known manner, a relief space 13 connects, connected to the suction side of the pump (not shown).
  • a labyrinth seal 17 is then provided, preferably with thread 17a provided on the housing side, which in the given direction of rotation of shaft 1, the must not be inverted, promotes towards space M, speed-dependent, as shown with F.
  • the promotional labyrinth seal 17 acts as that explained with reference to FIG. 1 Sealing level 3. Axially following, as has been explained, the barrier liquid sealing stage 7 is provided.
  • it comprises one on the housing side non-rotatably secured ring 19, the one with a Annular sealing chamber 21 abuts the shaft 1 and over at least two radially opposite bores 25 with radial outside widenings 23 with the outer ring periphery connected is.
  • the widenings 23 communicate on the housing side with at least one inlet line 27 for sealing liquid S and an outlet line 29.
  • Sealing elements preferably spring-loaded (not shown) stuffing box packings or lip seal arrangements 31, are axially on both sides of the ring 19 in corresponding Deformations provided on the housing side.
  • the axial extent of the Widenings 23 ensures that axial displacements of the Ring 19 without impeding the flow of barrier liquid S be recorded, due to the setting of the spring loaded gland packing.
  • the axially outer Area of the labyrinth seal ensuring that when shaft 1 is at a standstill, for example in the case of a melt-promoting Gear pump, taking into account the pressure drop in the bearing gap and possibly in the relief space, M, and the increase in viscosity of the pumped medium in the axially external Labyrinth seal area the necessary tightness between room M and sealing liquid sealing stage - sealing stage 7 is guaranteed.
  • labyrinth seals and barrier liquid level 7 in an interchangeable Liner 33 arranged in a simple manner with the Housing 15 through which is carried out to be connected can, how can be screwed.
  • the proposed shaft bushing is exceptional easy to service and no periodic emptying any designated leak zones and collecting spaces.
  • the cooling also ensures that the operating temperatures in the area of the sealing elements 31 this is stuffing box packings or lip seals that are used for this do not exceed the prescribed temperatures.
  • the cooling effect must be ensured in such a way that briefly, even when the shaft is stationary, against the operating pressure is written in room M, which, after stopping the wave 1, delayed, degrades.
  • the cooling effect can be influenced by the temperature, the volume flow, the thermal capacity and the thermal coupling of the Barrier medium adapted to the requirements of the respective product will.
  • Circulation of the sealing and, according to the invention, cooling liquid can preferably by utilizing the thermosiphon effect or by using a specially designed circulating element be made.
  • a circulating element a External pump can be provided or the shaft in the sealing chamber 21 be designed so that it itself as a circulating element works.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Claims (8)

  1. Procédé pour sceller un passage d'arbre dans une chambre remplie d'une substance, dans laquelle la pression change en fonction de la vitesse de rotation de l'arbre (n) et où la substance présente une viscosité variable avec la température (η), dans laquelle en commençant de la chambre (M), tout d'abord un joint (3) agissant en fonction de la vitesse de rotation est appliqué suivi d'un joint du fluide de blocage (7), ce fluide est utilisé en tant que moyen de transport de chaleur et la partie adjacente au joint variable avec la vitesse de rotation (3) est ainsi refroidie afin que là, principalement indépendamment de la vitesse de rotation, un joint est réalisé selon le changement de viscosité de la substance suite au refroidissement.
  2. Passage d'arbre dans une chambre pour une substance dans laquelle la pression de la substance change en fonction de la vitesse de rotation de l'arbre, où la viscosité (η) de la substance diminue quand la température augmente, dans laquelle à partir de la chambre (M), tout d'abord un joint à labyrinthe (17) avec un dispositif transporteur fileté (F) vers la chambre (M) est installé suivi d'un joint du fluide de blocage (7), caractérisé en ce qu'un système de circuit d'écoulement (29, 27) pour le fluide de blocage est fourni afin que ceci agisse aussi en tant qu'agent réfrigérant pour la partie adjacente au joint à labyrinthe.
  3. Passage d'arbre selon la revendication 2, caractérisé en ce que le joint du fluide de blocage comprend au moins une bague (19) arrangée sur l'arbre (1) avec les trous radiaux s'agrandissant axialement sur l'extérieur qui communique avec au moins un circuit d'alimentation et au moins un circuit extracteur (27, 19) pour le fluide de blocage (S) sur le côté logement, où l'agrandissement axial des élargissements (23) permet un déplacement de la bague (19) par rapport aux circuits (27, 29).
  4. Passage d'arbre selon la revendication 3, caractérisé en ce qu'axialement sur les deux côtés de la bague sont fournis des éléments de scellement (31) reposant sur l'arbre, de préférence de la garniture de boíte à garniture ou des joints à lèvres.
  5. Passage d'arbre selon les revendications 2 à 4, caractérisé en ce que le joint à labyrinthe (17) et le joint du fluide de blocage (7) sont arrangés sur une pièce rapportée (33) qui peut être attachée de manière amovible à un logement (33).
  6. Passage d'arbre selon les revendications 2 à 5, caractérisé en ce qu'un circuit de circulation à thermosiphon pour le fluide de blocage (S) est fourni ou un dispositif de circulation pour ceci, de préférence formé par une pompe externe et/ou des éléments de circulation sur l'arbre (1) dans la zone du joint du fluide de blocage (7).
  7. Pompe à engrenages avec au moins un passage d'arbre selon les revendications 2 à 6.
  8. Utilisation d'une pompe à engrenages selon la revendication 7 pour transporter des fusions de polymère.
EP93111510A 1993-07-17 1993-07-17 Procédé et dispositif d'étanchéité de traversée d'arbre pour pompes à engrenages Expired - Lifetime EP0643223B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP93111510A EP0643223B1 (fr) 1993-07-17 1993-07-17 Procédé et dispositif d'étanchéité de traversée d'arbre pour pompes à engrenages
AT93111510T ATE163074T1 (de) 1993-07-17 1993-07-17 Verfahren und anordnung zum dichten einer wellendurchführung bei zahnradpumpen
DE59308121T DE59308121D1 (de) 1993-07-17 1993-07-17 Verfahren und Anordnung zum Dichten einer Wellendurchführung bei Zahnradpumpen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93111510A EP0643223B1 (fr) 1993-07-17 1993-07-17 Procédé et dispositif d'étanchéité de traversée d'arbre pour pompes à engrenages

Publications (2)

Publication Number Publication Date
EP0643223A1 EP0643223A1 (fr) 1995-03-15
EP0643223B1 true EP0643223B1 (fr) 1998-02-04

Family

ID=8213089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93111510A Expired - Lifetime EP0643223B1 (fr) 1993-07-17 1993-07-17 Procédé et dispositif d'étanchéité de traversée d'arbre pour pompes à engrenages

Country Status (3)

Country Link
EP (1) EP0643223B1 (fr)
AT (1) ATE163074T1 (fr)
DE (1) DE59308121D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8225968B2 (en) 2009-05-12 2012-07-24 Illinois Tool Works Inc. Seal system for gear pumps
US11293554B2 (en) 2017-03-09 2022-04-05 Johnson Controls Technology Company Back to back bearing sealing systems

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108527813B (zh) * 2018-04-20 2024-04-12 浙江厚普科技有限公司 无丝网过滤设备及自密封冷却传动装置
CN109751238B (zh) * 2019-02-22 2024-03-08 郑州沃华机械有限公司 一种熔体齿轮泵及其密封结构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976405A (en) * 1974-10-29 1976-08-24 Cominco Ltd. Pump
DE3135037A1 (de) * 1980-09-12 1982-09-23 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid "austragspumpe"
US4575100A (en) * 1984-11-05 1986-03-11 The Dow Chemical Company Seal assembly which is hydraulically actuated
SE462537B (sv) * 1988-03-17 1990-07-09 Johnson Pump Ab Anordning ingaaende i pump med pumphus som bildar pumpens fundament

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8225968B2 (en) 2009-05-12 2012-07-24 Illinois Tool Works Inc. Seal system for gear pumps
US11293554B2 (en) 2017-03-09 2022-04-05 Johnson Controls Technology Company Back to back bearing sealing systems

Also Published As

Publication number Publication date
ATE163074T1 (de) 1998-02-15
EP0643223A1 (fr) 1995-03-15
DE59308121D1 (de) 1998-03-12

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