Process for the pneumatic transfer of a pulverulent material
First Claim
1. An apparatus for the pneumatic transfer of a pulverulent material comprising a container containing the pulverulent material and pneumatic means for emptying said container, wherein said pneumatic emptying means comprise a suction member which can be sealingly mounted in the axis of the container and can be displaced in translation along said axis, the suction member having two coaxial tubes, called the first tube and the second tube, open at their lower ends, said first tube defining in the suction member a central duct for the extraction of the pulverulent material to be transferred and the said second tube defines with the first tube an annular duct for introducing a fluid into said container, said first and second tubes having at their lower end a shape such that when the suction member is mounted in the axis of the container the annular duct issues into the container by an annular nozzle which can direct a gas jet onto the side walls of the container by orienting the jet towards the bottom of the container, means for supplying gas to the annular duct and suction means for extracting the said gas and the said pulverulent material by the central extraction duct, the said first and second tubes comprising means for controlling the dimension of the nozzle opening so that the gas jet having the annular nozzle converges on the side wall of the container, these means controlling the translation of said first and second tubes with respect to each other, whereby when the suction member is mounted in the axis of the container the convergence level of the gas jet on the container walls is maintained substantially level with the pulverulent material level in the container.
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Accused Products
Abstract
Process for the pneumatic transfer of a pulverulent material contained in a cylindrical container, wherein it comprises the introduction, via a sealed passage located in the upper part and in the axis of the container, of a suction member which is movable in translation along said axis and having at its suction end located in the container an annular nozzle which is able to direct a gas jet towards the walls of the container so as to ensure the scavenging of said walls during suction, the level of said annular nozzle in the container being maintained constantly above the level of the pulverulent material contained therein until all the material has been sucked out, including that on the bottom of the container. The process is performed by an apparatus for the pneumatic transfer of a pulverulent material comprising a cylindrical container containing the pulverulent material and pneumatic extraction duct for emptying the container. As a result of the invention it is possible to extract all the material contained in a container, particularly when the material is of a clogging or tacky nature.
40 Citations
7 Claims
- 1. An apparatus for the pneumatic transfer of a pulverulent material comprising a container containing the pulverulent material and pneumatic means for emptying said container, wherein said pneumatic emptying means comprise a suction member which can be sealingly mounted in the axis of the container and can be displaced in translation along said axis, the suction member having two coaxial tubes, called the first tube and the second tube, open at their lower ends, said first tube defining in the suction member a central duct for the extraction of the pulverulent material to be transferred and the said second tube defines with the first tube an annular duct for introducing a fluid into said container, said first and second tubes having at their lower end a shape such that when the suction member is mounted in the axis of the container the annular duct issues into the container by an annular nozzle which can direct a gas jet onto the side walls of the container by orienting the jet towards the bottom of the container, means for supplying gas to the annular duct and suction means for extracting the said gas and the said pulverulent material by the central extraction duct, the said first and second tubes comprising means for controlling the dimension of the nozzle opening so that the gas jet having the annular nozzle converges on the side wall of the container, these means controlling the translation of said first and second tubes with respect to each other, whereby when the suction member is mounted in the axis of the container the convergence level of the gas jet on the container walls is maintained substantially level with the pulverulent material level in the container.
Specification