Heat exchange – With valve or movable deflector for heat exchange fluid flow – With by-pass of heat exchanger or heat exchanger section
Patent
1982-03-08
1984-08-28
Wayner, William E.
Heat exchange
With valve or movable deflector for heat exchange fluid flow
With by-pass of heat exchanger or heat exchanger section
98 201, 165 16, 236 49, B64D 1300, B60H 100, F24F 700
Patent
active
044677065
ABSTRACT:
An environmental control system for an enclosed cab of an off-the-road vehicle such as a tractor includes a pressurization blower for pressurizing the cab to a positive pressure with respect to atmospheric pressure outside the cab, and a recirculation blower for recirculating air within the cab. The system includes a fresh air intake for taking in air from outside the cab, a recirculation air intake for taking in air from within the cab, and outlets through which the air from the blowers enters the cab. An air precleaner and a fresh air filter are provided between the pressurization blower and the fresh air intake. A control circuit automatically provides a speed control signal to the pressurization blower, and a manually selected speed control signal is provided to the recirculation blower. A speed sensor senses the speed of the pressurization blower, which varies for a given speed control signal as a function of air pressure within the cab and the condition of the fresh air filter. The control circuit varies the speed control signal to the pressurization blower as a function of the pressurization blower speed to provide essentially constant air flow from the pressurization blower despite changes in cab pressure and filter condition.
REFERENCES:
patent: 2311953 (1943-02-01), McKechnie
patent: 3018711 (1962-01-01), Welch et al.
patent: 3522839 (1970-08-01), Wendt et al.
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patent: 4344356 (1982-08-01), Casterton et al.
patent: 4375609 (1983-03-01), Wolf
Batcheller Barry D.
Martinson William E.
Sollecito J.
Steiger Tractor Inc.
Wayner William E.
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