Cross-over rib plate pair for heat exchanger

F - Mech Eng,Light,Heat,Weapons – 28 – F

Patent

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Details

F28F 3/14 (2006.01) F28D 1/02 (2006.01) F28D 1/03 (2006.01) F28F 3/08 (2006.01) F28F 3/12 (2006.01)

Patent

CA 2484856

According to one example of the invention, there is provided a multipass plate pair for conducting a fluid in a heat exchanger. The plate pair includes first and second plates, each plate having at least two longitudinal columns of externally protruding obliquely angled ribs formed therein and separated by a longitudinal flat section extending from substantially a first end of the plate to a terminus spaced apart from a second end of the plate. Each plate includes, between the terminus and the second end, a turn portion joining the two longitudinal columns. The first and second plates are joined together with the longitudinal flat sections abutting each other and the columns of angled ribs cooperating to form undulating first and second internal flow channels there-through separated by the abutting longitudinal flat sections. The first and second internal flow channels each have an upstream area and a downstream area relative to a flow direction of an external fluid flowing over the plate pair. The turn portions of the plates cooperate to define at least a first internal flow path for directing fluid from the upstream area of the first internal flow channel to the downstream area of the second internal flow channel and a second internal flow path for directing fluid from the downstream area of the first internal flow channel to the upstream area of the second internal flow channel.

Selon un exemple de l'invention, une paire de plaques à circulations multiples pour diriger un fluide dans un échangeur de chaleur. Cette paire de plaques comprend une première et une seconde plaques, chaque plaque comprenant au moins deux colonnes longitudinales constituant des renforts obliques dépassant extérieurement. Ces colonnes sont séparées par une partie plate longitudinale qui s'étendra sensiblement d'une première extrémité de la plaque jusqu'à un point terminal séparé d'une seconde extrémité de la plaque. Chaque plaque comprend, entre le point terminal et la seconde extrémité, une partie coudée qui joint les deux colonnes longitudinales. La première et la seconde plaques sont assemblées avec les parties plates longitudinales aboutées. Les colonnes des renforts angulaires coopèrent pour former des premier et second canaux ondulants de circulation intérieure, séparés par les parties plates longitudinales aboutées. Les premier et second canaux de circulation intérieure comportent chacun une zone amont et une zone aval par rapport à un sens de circulation d'un fluide extérieur circulant sur la paire de plaques. Les parties coudées des plaques coopèrent pour déterminer au moins un premier trajet de circulation interne pour diriger le fluide, de la zone amont du premier canal de circulation interne, jusqu'à la zone aval du second canal de circulation interne, et un second trajet de circulation interne pour diriger le fluide, de la zone aval du premier canal de circulation interne, jusqu'à la zone amont du second canal de circulation interne.

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