An apparatus and method for reducing stress in the brace bar...

G - Physics – 01 – F

Patent

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G01F 1/84 (2006.01)

Patent

CA 2167288

A Coriolis effect mass flow meter having a brace bar of improved flexibility which reduces the stress concentration in a brace bar as well as in areas of meter's flow tubes proximate the brace bar and flow tubes of the flow meter. A brace bar means is disclosed that has a void in an area between its holes that receive the flow tubes. This void increases the flexibility of the brace bar and shifts the concentration of operational and manufacturing induced stresses away from the braze joints between the brace bar and the flow tubes. The stresses are reduced and shifted away from the flow tubes to an area within the brace bar that is less critical to the overall life and reliability of the flow tubes. Meter sensitivity is improved due to enhanced flexibility of the present invention's brace bar in response to the motion induced by the Coriolis effect. Additional embodiments are disclosed which also provide increased flexibility of the brace bar while maintaining required rigidity to resist undesirable independent motion of the flow tubes.

Débitmètre massique à effet de Coriolis possédant une plaquette d'entretoisement à souplesse améliorée et assurant une réduction de la concentration de contraintes dans la plaquette d'entretoisement ainsi que dans les tubes d'écoulement du débitmètre et les zones de ceux-ci qui se situent à proximité de la plaquette d'entretoisement. On a mis au point une plaquette d'entretoisement présentant un vide dans la zone comprise entre les trous traversés par les tubes d'écoulement. Ce vide augmente la souplesse de la plaquette et éloigne des joints brasés entre la plaquette et les tubes la concentration de contraintes dues à l'exploitation et à la fabrication. Les contraintes sont réduites et déplacées depuis les tubes d'écoulement vers une zone située à l'intérieur de la plaquette d'entretoisement, cette zone étant moins importante quant à la vie utile et la fiabilité globale des tubes d'écoulement. Le débitmètre est plus sensible puisque ladite plaquette d'entretoisement répond plus souplement aux mouvements dus à l'effet de Coriolis. On a également prévu d'autres modes de réalisation assurant une plus grande souplesse de la plaquette d'entretoisement sans atténuer la rigidité dont elle a besoin pour s'opposer à tout mouvement indépendant indésirable des tubes d'écoulement.

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