Flow sensor and production method thereof

Details Flow sensor and production method thereof Flow sensor and production method thereof

B - Operations, Transporting

01

L

B01L 3/00 (2006.01) G01F 1/00 (2006.01) G01N 35/00 (2006.01)

Patent

CA 2695486

In a flow sensor (1) comprising a flow channel (14) embedded in a base body (1'), a flow sensor element (13) adjacent to the flow channel (14) and a cover plate (12) covering the flow channel (14) and arranged on the base body (1'), the flow channel (14) is formed by an elastic sealing lip which delimits said channel (14), running on and around an upper side of the base body (1') lying opposite the cover plate (12) and is pressed against the cover plate (12) such that a seal is formed. The design of the flow channel (14) by means of the sealing lip (5) allows the flow channel (14) to be sealed off from possible gaps between the base body (1') and the cover plate (12) and in relation to the cover plate (12), such that a flow channel with a level channel bed (14) is formed by the sealing lip (15) and the cover plate (12) which channel bed has smooth peripheral areas and a uniform cross-section, and which if possible avoids the depositing and collection of dirt particles and thus prevents undesirable turbulence in the flow channel (14) and guarantees a laminar current through the flow channel (14).

L'invention concerne un capteur de débit (1) avec un conduit de passage (14) ménagé dans un corps de base (1'), un élément (13) capteur de débit limitrophe du conduit de passage (14), et une plaque de recouvrement (12) disposée sur le corps de base (1') et recouvrant le conduit de passage (14). Le conduit de passage (14) est formé par une lèvre d'étanchéité élastique qui délimite périphériquement le conduit de passage (14) sur une face supérieure du corps de base (1') tournée vers la plaque de recouvrement (12) et qui est pressée en étanchéité contre la plaque de recouvrement (12). En formant le conduit de passage (14) au moyen de la lèvre d'étanchéité (15), on assure l'étanchéité du conduit de passage (14) vis-à-vis d'éventuelles interstices entre le corps de base (1') et la plaque de recouvrement (12) et vis-à-vis de la plaque de recouvrement (12). La lèvre d'étanchéité (15) et la plaque de recouvrement (12) forment ainsi un conduit de passage (14) ayant un fond de conduit plan (141) qui présente des faces de délimitation lisses et une section constante et qui évite le plus possible le dépôt et l'accumulation de particules de poussières, et de ce fait empêche des turbulences indésirables dans le conduit de passage (14) et garantit un écoulement laminaire à travers le conduit de passage (14).

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