DD241453A1

DD241453A1 - SEAL

Info

Publication number: DD241453A1
Application number: DD28119885A
Authority: DD
Inventors: Peter Hilarius; Dietmar Koehler
Original assignee: Barkas Werke Veb
Priority date: 1985-09-30
Filing date: 1985-09-30
Publication date: 1986-12-10

Abstract

Die Erfindung betrifft eine Gleitringdichtung zwischen zwei im Verhaeltnis zueinander rotierenden Maschinenteilen, insbesondere einer Wellendurchfuehrung durch ein Gehaeuse und ist in fast allen Bereichen des Maschinenbaues anwendbar. Es ist das Ziel der Erfindung, eine Gleitringdichtung zu schaffen, die sich neben einer hohen Lebensdauer mit annaehernd gleichbleibenden Dichteigenschaften durch eine einfache und kostenguenstige Herstellung auszeichnet, wobei eine staendige, dichtende Anlage des Gleitringes an einer Dichtflaeche ohne zusaetzliche Andrueckelemente wie Federn, Druckmedien oder aehnliches ermoeglicht wird. Erfindungsgemaess wird die Aufgabe dadurch geloest, dass mindestens ein, im Umfang nicht geschlossener Gleitring, mit einer radialen Vorspannung auf einer an einem der zwei Maschinenteile befindlichen konischen Auflageflaeche aufliegt, infolgedessen der Gleitring mit einer, durch die radiale Vorspannung in Verbindung mit der konischen Auflageflaeche erzeugte, in axialer Richtung wirkenden Kraft belastet ist, die zum dichtenden Anliegen des Gleitringes an einer an dem anderen Maschinenteil befindlichen, eine axiale Verschiebung des Gleitringes verhindernde Dichtflaeche, fuehrt. Fig. 1 und 2The invention relates to a mechanical seal between two mutually rotating machine parts in relation to each other, in particular a shaft passage through a housing and is applicable in almost all areas of mechanical engineering. It is the object of the invention to provide a mechanical seal, which is characterized in addition to a long service life with almost uniform sealing properties by a simple and cost-effective production, with a staendige, sealing contact the slide ring on a sealing surface without additional pressure elements such as springs, print media or the like is possible. According to the invention, the object is achieved in that at least one, in the periphery not closed sliding ring rests with a radial bias on a located on one of the two machine parts conical Auflageflaeche, consequently, the sliding ring with one, generated by the radial bias in connection with the conical Auflageflaeche , Is loaded in the axial direction acting force, which leads to the sealing abutment of the sliding ring on a located on the other machine part, an axial displacement of the seal ring preventing sealing surface leads. Fig. 1 and 2

Description

embodiment

Das Prinzip der erfindungsgemäßen Lösung wird nachfolgend anhand von zwei Ausführungsbeispielen beschrieben, wobei sich jeweils zwei Gleitringe inThe principle of the solution according to the invention is described below with reference to two exemplary embodiments, wherein in each case two sliding rings in

Fig. 1: in konischen Bohrungen und inFig. 1: in conical holes and in

Fig.2: auf konischen Flächen auf einer WelleFig.2: on conical surfaces on a shaft

anlegen.invest.

Die Darstellung der Fig. 1 zeigt eine Welle 1 in der zwei Ringnuten 2 zur Aufnahme der im Umfang nicht geschlossenen und mit einer Vorspannung versehenen Gleitringe 3 angeordnet sind. Die Welle 1 durchragt eine Gehäusewandung 4, dessen Wellendurchgangsbohrung sich von der Mitte der Gehausewandung 4 nach beiden Seiten konisch vergrößert. Durch die radial in Richtung nach außen wirkende Vorspannung werden die Gleitringe 3 gegen die Konusflächen 5 gedrückt und legen sich an die Dichtflächen 6 an.The illustration of Fig. 1 shows a shaft 1 in which two annular grooves 2 for receiving the circumferentially not closed and provided with a bias sliding rings 3 are arranged. The shaft 1 extends through a housing wall 4, whose shaft passage bore increases conically from the center of the housing wall 4 on both sides. By acting radially outward bias the seal rings 3 are pressed against the conical surfaces 5 and lie against the sealing surfaces 6 at.

In Fig. 2 befinden sich die Ringnuten 7 in der Wellendurchgangsbohrung des Gehäuses 8. Die mit einer nach innen gerichteten radialen Vorspannung versehenen Gleitringe 9 liegen auf den konischen Flächen 10 der Welle 11 auf und legen sich an die Dichtflächen 12 der Ringnuten 7 an. In diesem Ausführungsbeispiel sind die Gleitringe 9 mit ihren auf den konischen Flächen 10 der Welle 11 aufliegenden Flächen dem Konuswinkel angepaßt. Durch die sich aus der radialen Vorspannung der Gleitringe 3,9 in Verbindung mit den konischen Flächen 5,10 ergebende ständig wirkende Kraftkomponente der Gleitringe 3,9 in Richtung auf die Dichtflächen 6,12 kommt es während der Rotation der Wellen 1,11 zum ständigen sicheren Anliegen der Gleitringe 3,9 an die Dichtflächen 6,12 und damit zum sicheren Abdichten.In Fig. 2 are the annular grooves 7 in the shaft passage bore of the housing 8. The provided with an inwardly directed radial bias slip rings 9 rest on the conical surfaces 10 of the shaft 11 and lie against the sealing surfaces 12 of the annular grooves 7. In this embodiment, the sliding rings 9 are adapted with their resting on the conical surfaces 10 of the shaft 11 faces the cone angle. Due to the resulting from the radial bias of the sliding rings 3.9 in conjunction with the conical surfaces 5.10 resulting constant force component of the sliding rings 3.9 toward the sealing surfaces 6,12 occurs during the rotation of the waves 1,11 to permanent safe concerns of the sliding rings 3.9 to the sealing surfaces 6,12 and thus for secure sealing.

Entsprechend möglicher Anwendungsfälle können eine Vielzahl weiterer Anordnungen der erfindungsgemäßen Gleitringdichtung realisiert werden, so z. B. durch nur nach einer Seite gerichtete konische Flächen ein nach einer Seite erfolgendes Anlegen der Gleitringe an die Dichtflächen.According to possible applications, a variety of other arrangements of the mechanical seal according to the invention can be realized, such. B. by only one side directed conical surfaces on one side succession applying the slip rings to the sealing surfaces.

Claims

Invention claim:

1. mechanical seal for sealing between two relatively rotating machine parts with at least one sliding ring and a sealing face sealingly cooperating with one side of the seal ring, characterized in that at least one, not closed in the periphery seal (3.9), with a radial bias on a conical bearing surface (5, 10) located on one of the two machine parts rests, as a result of which the sliding ring (3, 9) is loaded with a force acting in the axial direction by the radial prestress in connection with the conical bearing surface (5, 10) is, for sealing engagement of the seal ring (3,9) located on a located on the other machine part, an axial displacement of the seal ring (3,9) preventing sealing surface (6,12), leads.

2. Mechanical seal according to item 1, characterized in that the outwardly acting radial bias of the seal ring (3) leads to resting its outer diameter in an inner cone.

3. mechanical seal according to item 1, characterized in that the inwardly acting radial bias of the sliding ring (9) for resting its inner diameter on an outer cone leads.

4. mechanical seal according to the points 1 ..bis 3., characterized in that the surface resting on the cone of the sliding ring (3,9) is conically shaped according to the angle of the cone of the support surface.

For this 1 page drawing

Field of application of the invention

The invention relates to a seal by means of a sliding ring between two relatively rotating machine parts, in particular a shaft passage through a housing and is applicable in almost all areas of mechanical engineering.

Characteristic of the known technical solutions

From the patent literature a variety of different ways of sealing a rotating shaft are known. The most common method is sealing by plastic or elastic sealing elements such. B. round rings or shaft seals. However, these sealing elements are exposed to high wear, especially at strongly changing temperatures and pressures as well as other unfavorable factors such as dirt or aggressive media and lead to frequent failures or leaks.

Also known methods of sealing rotating shafts, such. As labyrinth seals or corresponding metal cover are limited to specific, narrow demarcated applications and / or are associated with a high production cost.

A well-known in various embodiments method for shaft seal is the Gleitringmethode, wherein at least one slide ring either stands still or seals against at least one rotating contact surface, or rotated and seals against at least one stationary contact surface. In this case, in certain embodiments, which are limited to corresponding applications, waives a direct sliding contact of the slide ring relative to the contact surfaces and thus a rising with increasing wear gap, which is associated with corresponding leaks, taken on account of the very low manufacturing costs in purchasing. A much better seal is achieved with a direct sliding contact between the sliding ring and contact surface. The known embodiments realize this direct sliding contact by pressing the slide ring by springs (DD PS 149278, DE-OS 2314903, DE-OS 3239465), by the action of a pressure medium, DR-PS 149278, on the slip ring or by magnetic force effects.

Object of the invention

The aim of the invention is to provide a seal by means of a sliding ring between two mutually rotating machine parts, which is characterized in addition to a long service life with approximately constant sealing properties by a simple and inexpensive production.

Explanation of the essence of the invention

Based on the object of the invention, the object is to provide a mechanical seal between two mutually rotating machine parts, with a permanent, sealing engagement of the seal ring on a sealing surface without additional pressing elements such as springs, print media or the like is made possible. According to the invention, the object is achieved in that at least one, not closed in the periphery sliding ring rests with a radial bias on a located on one of the two machine parts conical bearing surface, consequently, the sliding ring with one, generated by the radial bias in connection with the conical bearing surface , Is loaded in the axial direction acting force, which leads to the sealing engagement of the seal ring on a located on the other machine part, an axial displacement of the seal ring preventing sealing surface leads. The radial bias of the seal ring can act according to the embodiment both on an inner and on an outer cone. The resting on the cone surface of the slide ring may also be designed conically according to the angle of the cone of the support surface.