device to charge the air in the vehicle compartment has a voyageursd'

摘要

1308300 Heating and ventilating vehicles SMITH INDUSTRIES Ltd 5 March 1970 [21 March 1969] 14853/69 Heading F4V [Also in Division F1] A ventilating unit for a motor vehicle comprises a housing with two facing side walls, a centrifugal fan having at least one impeller within the housing with its axis normal to the side walls, each side wall having an opening in alignment with the ends of the or each impeller, and a pressure responsive valve that prevents air flow through one of the openings when air flows through the other opening and the fan is inoperative. In the form shown, the valve comprises a sheet 10 of resin impregnated fabric attached by screws 9 to the inwardly directed face of a member 8 that subdivides the said one opening 6, 7. The opening 6, 7 receives recirculation air and the other opening fresh air by the ram effect of the vehicle. The housing includes a heat exchanger immediately downstream of the fan, which is fed with engine coolant via a flow control valve. A flap valve 25 operated by a flexible cable or bell-crank lever, controls airflow from the housing through outlets 29 to windscreen nozzles and outlets 32 in the sides and bottom of the housing to the vehicle foot space. One or both inlets to the housing may include an annular guide plate to direct airflow into the eye of the corresponding impeller. The housing is formed in two mating parts of rigid plastics material, connected together by spring clips. A variable speed fan driving motor 15 is supported by a plate having projecting tabs clamped between the parts of the housing.