FILTER UNITS, FILTRATION METHODS, AND FILTRATION SYSTEMS

摘要

A filter unit, system and method for removing grease, oil and other particulates from air. The filter unit includes a housing having upstream and downstream walls and a cavity therebetween. The upstream wall has an entrance opening aligned with a downstream wall portion, and the downstream wall has first and second exit openings aligned with first and second upstream wall portions. A heat exchanger is disposed within the cavity and includes first and second upstream conduits within the entrance opening and first and second downstream conduits within the first and second exit opening. The entrance and exit openings are arranged to define S-shaped air flow paths through the housing between the entrance and exit openings, each of which flows around a downstream side of one of the upstream conduits then around an upstream side of one of the downstream conduits before exiting through one of the exit openings.

主权项

1. A filter unit comprising:
a housing having an upstream wall disposed at an upstream side of the housing, a downstream wall disposed at a downstream side of the housing, and a cavity therebetween, the upstream wall having a first entrance opening therein and first and second upstream wall portions separated by the first entrance opening, the downstream wall having first and second exit openings therein and a downstream wall portion between the first and second exit openings, the first entrance opening being disposed in the upstream wall so as to be aligned with the downstream wall portion, the first and second exit openings being disposed in the downstream wall so as to be aligned with, respectively, the first and second upstream wall portions; a heat exchanger disposed within the cavity, the heat exchanger having fluid flow conduits comprising at least first and second upstream conduits within the first entrance opening, a first downstream conduit within the first exit opening, and a second downstream conduit within the second exit opening; first and second entrance fins adjacent the first entrance opening; first and second baffles adjacent, respectively, the first and second exit openings; wherein the first entrance opening, the first and second exit openings, the first and second entrance fins, and the first and second baffles are configured and arranged to define first and second S-shaped air flow paths through the housing between the first entrance opening and the first and second exit openings; and wherein air entering the first entrance opening flows between the first and second upstream conduits and is then separated into first and second flow portions, the first flow portion flows around a downstream side of the first upstream conduit, then between the first entrance fin and the first baffle, then around an upstream side of the first downstream conduit, then exits the housing through the first exit opening, and the second flow portion flows around a downstream side of the second upstream conduit, then between the second entrance fin and the second baffle, then around an upstream side of the second downstream conduit, then exits the housing through the second exit opening.