Sensor assembly for detecting ice crystal formation on heat...

G - Physics – 01 – D

Patent

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G01D 1/18 (2006.01) F25C 1/00 (2006.01) F25C 3/04 (2006.01) G01N 25/00 (2006.01)

Patent

CA 2647682

A sensor assembly (50) for detecting ice crystal formation on a heat exchange surface in an ice-making machine (12) comprises at least one microphone (100) monitoring the sound made by a rotating blade assembly within the ice-making machine during ice slurry formation. A filter (104) filters the output of the microphone to remove background noise. A comparator (106) receives the output of the filter and compares the filtered microphone output with a threshold to determine if the filtered microphone output signifies ice crystal formation on the heat exchange surface. The operation of the ice-making machine (12) can then be adjusted in a manner to allow the formed ice crystals to be removed from the heat exchange surface.

La présente invention concerne un ensemble de détection (50) conçu pour détecter la formation de cristaux de glace sur une surface d'échange thermique dans une machine à glace (12). Cet ensemble comprend au moins un microphone (100) qui surveille le son produit par un ensemble de lames rotatives à l'intérieur de la machine à glace lors de la formation d'un coulis de glace. Un filtre (104) filtre la sortie du microphone afin d'éliminer le bruit de fond. Un comparateur (106) reçoit la sortie du filtre et compare la sortie du microphone filtrée à une valeur seuil, afin de déterminer si la sortie du microphone filtrée indique une formation de cristaux de glace sur la surface d'échange thermique. Le fonctionnement de la machine à glace (12) peut ensuite être réglé de manière à pouvoir retirer de la surface d'échange thermique les cristaux de glace formés.

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