초록 ▼

A cryogenic freezer having a thermally insulated tunnel-like enclosure with an entrance and an exit and means for conveying products being frozen therethrough. Products are contacted with liquid cryogen at a region generally near the entrance and a blower located closer to the entrance than to the e

A cryogenic freezer having a thermally insulated tunnel-like enclosure with an entrance and an exit and means for conveying products being frozen therethrough. Products are contacted with liquid cryogen at a region generally near the entrance and a blower located closer to the entrance than to the exit controls flow of cryogen vapor. Upstream and downstream baffles and dampers associated with blower are linked together for complementary movement to selectively regulate the upstream and downstream flow of vapor discharged from the blower. Additional blowers circulate the cold cryogenic vapor transverse to the direction of the conveying means. The temperature of vapor leaving the region of the entrance is monitored the orientation of the baffle and damper arrangement is adjusted in accordance with the temperature monitored. The food products can be contacted by liquid nitrogen in a reservoir facilitates cleaning and retards inefficient vaporization.

대표청구항 ▼

A cryogenic freezer comprising a thermally insulated tunnel-like enclosure having an entrance and an exit, means for conveying products being frozen from said entrance to said exit, means for contacting products being frozen with liquid cryogen at a region generally near said entrance, blower means

A cryogenic freezer comprising a thermally insulated tunnel-like enclosure having an entrance and an exit, means for conveying products being frozen from said entrance to said exit, means for contacting products being frozen with liquid cryogen at a region generally near said entrance, blower means located in an upper region of said enclosure at a location closer to said entrance than to said exit having a fan blade mounted for rotation about a generally vertical axis, additional blower means mounted in said enclosure downstream of said blower means for circulating the cryogenic vapor within said enclosure in a direction transverse to the direction of said conveying means, upstream and downstream baffle means associated with said blower means and linked together for complementary movement so as to selectively regulate the upstream flow of vapor and the downstream flow of vapor resulting from said blower means discharge to the respective extents desired, and means for monitoring the temperature of vapor leaving the region of said entrance and adjusting the orientation of said baffle means in accordance with the temperature monitored.