Patent ID: 7419535

Claim:
Device ( 16 ) for blowing an air flow ( 12 ) filled with a fragrant substance, comprising: a dilution system ( 18 ), in which the air flow ( 12 ) circulates at a generally constant rate, which emerges into a blower nozzle ( 22 ) and into which the substance is injected, a reservoir ( 32 ) in which the substance is stored in liquid form, and a system for sampling ( 34 ) a predetermined quantity of the substance, from the reservoir ( 32 ) by means of a sampling gas consisting of the air aspirated from a volume of ambient air, which emerges into the dilution system ( 18 ), wherein, the sampling system ( 34 ) comprises means for dividing the flow of sampling gas into a first fraction and a second fraction of sampling gas, such that the first fraction of the flow of sampling gas circulates in the reservoir ( 32 ) picking up the said determined quantity of substance, then is mixed with the second fraction of the flow of sampling gas which is used to regulate the pressure and/or the flow rate of sampling gas, and the sampling system ( 34 ) comprises a shut-off valve ( 62 ) which is capable of cutting off the supply of sampling gas and whose opening and/or closing is controlled by an associated control system ( 64 , 66 ).