Element that defines a gap and is to be mounted on a shaft

Details Element that defines a gap and is to be mounted on a shaft Element that defines a gap and is to be mounted on a shaft

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 29/04 (2006.01) F04D 29/10 (2006.01) F04D 29/62 (2006.01)

Patent

CA 2498633

The invention relates to an element, which is to be mounted on the shaft of a non-positive--displacement machine and which forms a gap for the limited passage of a flowing medium. Said element comprises a bush-like part (2), which is to be mounted on the shaft of the non-positive--displacement machine and whose outer periphery is provided with a recess (4) for accommodating a ring (5). During operation of the non-positive-displacement machine, the ring (5), which is partially surrounded on its faces by circular ring-shaped walls of the recess (4); a) forms an axial gap with the circular ring-shaped walls of the recess (4) and forms a radial gap with the bottom of the recess, and; b) is held via frictional contact by a rigid wall (1) surrounding the ring (5). In order to reduce wear to the rings made of a soft flowable material, the invention provides that a recess is formed in the rigid wall (1) and surrounds the faces of the ring (5) that are free from the walls of the bush-like part. One of the lateral delimitations of the recess (4) is formed by a tubular part (7) detachably joined to the rigid wall (1).

L'invention concerne un élément définissant une fente pour le passage limité d'un milieu d'écoulement, à monter sur l'arbre d'une turbomachine. Ledit élément comprend une partie de type douille (2) à monter sur l'arbre de la turbomachine, qui présente une cavité (4) pour une bague (5) au niveau de sa périphérie extérieure. La bague (5) dont les faces d'about sont en partie entourées de parois en anneau de cercle de la cavité (4) lorsque la turbomachine est en service, a) forme, conjointement avec les parois en anneau de cercle de la cavité (4), dans chaque cas une fente axiale et une fente radiale, avec le fond de la cavité ; b) la bague est maintenue par une paroi rigide (1) entourant ladite bague, par liaison de friction. L'invention vise à réduire l'usure des bagues consistant en un matériau souple coulant. A cet effet, il est prévu selon l'invention de former un évidement dans la paroi rigide (1), qui entoure les faces d'about libre de la bague (5), dégagées des parois de la partie de type douille. Une des délimitations latérales de l'évidement (4) est formée par un élément tubulaire (7) relié de manière amovible à la paroi rigide (1).

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