Injector-feed device for pneumatic feed of powder
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United States of America Patent
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Apr 1, 1997
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 8, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
An injector-conveyor device for the pneumatic conveying of powder, particularly powdered coating material, in order to measure the amount of powder conveyed, measures indirectly the vacuum produced in an injector (4) by having a stream of air measured with respect to its amount of flow or pressure drop in a throttled measurement channel (30) which places the outside atmosphere (32) in fluid communication with the vacuum chamber (10) of the injector (4). In order to avoid errors in measurement due to pressure variations in a powder suction channel (8), an equalization air inlet (56) is provided by means of which a small amount of equalization air is introduced into the powder suction channel (8) in order to make the pressure variations occurring therein of higher frequency and smaller with respect to the amplitudes of variation.
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