Abstract:
The dispersal system has a hollow body (3) through which the air-powder mixture (16) is fed in the axial spray direction, with a pressurised control air stream (6) directed on to the mixture tangentially at one or more points. The air/powder mixture is subjected to both axial and tangential pulsations for divergence of the mixture to form a wide powder cloud (15). Nozzles of several shapes and bores are shown, with HV electrode 14.
Abstract:
The method has the fluidisation occurring in a twin chambered device (2), the first chamber (3 )receiving the compressed air that then passes through a "frit" to the second chamber(4). The powder in the second chamber leaves the device from the nozzle (11) and is charged up. The powder is filled through the hole (9) which can be closed off. Apart from the nozzle and the air inlet and outlet valves (17,19), the fluidisation takes place in a closed chamber, the valves being used to maintain the correct pressure proportions. Additional mechanical energy is passed to the fluidised bed of the second chamber in the form of vibration.
Abstract:
The method has the fluidisation occurring in a twin chambered device (2), the first chamber (3 )receiving the compressed air that then passes through a "frit" to the second chamber(4). The powder in the second chamber leaves the device from the nozzle (11) and is charged up. The powder is filled through the hole (9) which can be closed off. Apart from the nozzle and the air inlet and outlet valves (17,19), the fluidisation takes place in a closed chamber, the valves being used to maintain the correct pressure proportions. Additional mechanical energy is passed to the fluidised bed of the second chamber in the form of vibration.
Abstract:
The dispersal system has a hollow body (3) through which the air-powder mixture (16) is fed in the axial spray direction, with a pressurised control air stream (6) directed on to the mixture tangentially at one or more points. The air/powder mixture is subjected to both axial and tangential pulsations for divergence of the mixture to form a wide powder cloud (15). Nozzles of several shapes and bores are shown, with HV electrode 14.
Abstract:
The method involves a container (2) with a drain pipe (25). Air is introduced into the pipe through an opening and the adjustable air pressure controls the mass flow through the pipe from zero to a maximum value. The container is part of a powder spraying unit (1) and the powder is removed from a fluidised bed in the middle of it.
Abstract:
The method has the fluidisation occurring in a twin chambered device (2), the first chamber (3 )receiving the compressed air that then passes through a "frit" to the second chamber(4). The powder in the second chamber leaves the device from the nozzle (11) and is charged up. The powder is filled through the hole (9) which can be closed off. Apart from the nozzle and the air inlet and outlet valves (17,19), the fluidisation takes place in a closed chamber, the valves being used to maintain the correct pressure proportions. Additional mechanical energy is passed to the fluidised bed of the second chamber in the form of vibration.
Abstract:
Die Erfindung bezieht sich auf ein Verfahren und eine Einrichtung zur Steuerung des Fluidpulveraustritts aus einem Behälter. Sie läßt sich anwenden zur Steuerung des Pulverausstoßes aus einer Pulversprüheinrichtung zum elektrostatischen Lackieren. Mit der Erfindung wird vorgeschlagen, die Nachteile einer mechanischen Schließeinrichtung zu vermeiden durch Einleitung einer Schließluft (L S ) in ein Entnahmerohr (25) für die Entnahme fluidisierten Pulvers (8) aus einem Behälter (2). Die Einleitung der Schließluft (L S ) erfolgt über ein Rohr (51), das in eine Öffnung (50) am Mantel des Entnahmerohrs (25) mündet. Der Massenstrom des fluidisierten Pulvers kann durch entsprechende Einstellung eines Druckes (p R ) im Entnahmerohr (25) im Verhältnis zum Druck (p 3 ) im Fluidbett, dh durch Einleitung von Schließluft (L S ) mit entsprechendem Druck gesteuert werden.