초록 ▼

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 d

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.

대표청구항 ▼

An injector-conveyor system, for pneumatic conveyance of powder coating material, comprising: a powder container containing a supply of said powder coating material; a powder-air channel for discharging air and said powder coating material toward an object to be coated; a vacuum chamber disposed ups

An injector-conveyor system, for pneumatic conveyance of powder coating material, comprising: a powder container containing a supply of said powder coating material; a powder-air channel for discharging air and said powder coating material toward an object to be coated; a vacuum chamber disposed upstream of said powder-air channel; a powder intake channel having one end thereof fluidically connected to said supply of said powder coating material contained within said powder container, and another end thereof fluidically connected to said vacuum chamber; means for discharging a stream of said air through said vacuum chamber and into said powder-air channel for creating a vacuum within said vacuum chamber whereby an amount of said powder coating material from said powder container is drawn through said powder intake channel, into said vacuum chamber, mixed with said stream of said air, and discharged as a mixture of said stream of said air and said amount of said powder coating material through said powder-air channel and toward said object to be coated; conduit means fluidically connecting said vacuum chamber to atmospheric air for drawing an amount of said atmospheric air through said conduit means and into said vacuum chamber for mixing with said powder coating material and said stream of said air; and means disposed within said conduit means for measuring said amount of said atmospheric air flowing through said conduit means and into said vacuum chamber and for generating a measurement signal which is proportionally indicative of said amount of said powder coating material being drawn into said vacuum chamber, mixed with said stream of said air and said amount of said atmospheric air, and discharged along with said stream of said air and said amount of atmospheric air through said powder-air channel.