Abstract:
A color changer has a common feed passage that is connected to two or more inlet passages. The common feed passage can be reverse purged in a direction that is opposite a direction of powder flow through the common feed passage. A valve element seals a supply port that connects the inlet passage to the common feed passage to eliminate dead space and form a near bore line seal. The valve element is an elastic material that expands in response to applied compressed air inside the valve element.
Abstract:
A spraycoating powder feed apparatus includes a powder pump of which the direction of feed is reversible and a conduit switch configured to alternately link either of two powder conduits to a powder hookup of the powder pump as a function of the conveyance direction of the powder pump.
Abstract:
Process and a device (2) for the pneumatic conveyance of powdered material (4), in which a cylindrical chamber (10, 12), which can be connected with a reservoir (6) by a sealable inlet (14, 16) and with a delivery line (28) by a sealable outlet (18, 20), is alternately filled with material from the reservoir (6) and emptied of this material by applying a negative pressure to the chamber with its outlet (18, 20) closed and its inlet (14, 16) open through a bordering wall formed by a gas-permeable filter element (50) to draw material into the chamber (10, 12) from the reservoir (6), and by then admitting a gas under pressure into the chamber (10, 12) with its inlet (14, 16) closed and its outlet (18, 20) open to force the material previously drawn into the chamber (10, 12) out of the chamber and into the delivery line (28).
Abstract:
A dense phase pump for particulate material includes a pump chamber wherein material flows into the pump chamber under negative pressure and flows out of the pump chamber under positive pressure. A plurality of pinch valves are provided to control flow of material into and out of the pump chamber. The pinch valves are operated independent of each other and of the pump cycle rate. A modular design of the pump is provided.
Abstract:
A pump for particulate material includes a pump chamber wherein material flows into the pump chamber under negative pressure and flows out of the pump chamber under positive pressure. A plurality of pinch valves are provided to control flow of material into and out of the pump chamber. The pinch valves are operated independent of each other and of the pump cycle rate. A modular design of the pump is provided. A pump control feature is provided for air flow rate control during positive and negative pressure conditions.
Abstract:
A conveying chamber hose for a device for conveying fluid is embodied in an elastic manner, has an inlet and an outlet and has the smallest resistance in the area of the inlet.
Abstract:
The invention concerns a process and a device (2) for the pneumatic conveyance of powdered material (4), in which a cylindrical chamber (10, 12), which can be connected with a reservoir (6) by a sealable inlet (14, 16) and with a delivery line (28) by a sealable outlet (18, 20), is alternately filled with material from the reservoir (6) and emptied of this material by applying a negative pressure to the chamber with its outlet (18, 20) closed and its inlet (14, 16) open through a bordering wall formed by a gas-permeable filter element (50) to draw material into the chamber (10, 12) from the reservoir (6), and by then admitting a gas under pressure into the chamber (10, 12) with its inlet (14, 16) closed and its outlet (18, 20) open to force the material previously drawn into the chamber (10, 12) out of the chamber and into the delivery line (28). To prolong the service life of the filter element (50) and to avoid contamination of the filter element more easily, it is proposed, in accordance with the invention, that the filter element (50) be designed as a hollow cylinder and that it surround at least a portion of the chamber (10, 12).
Abstract:
Transport system with several devices (1) for transporting powder, where each device (1) has a transfer chamber (3) into which a supply line (6) and a discharge line (8) for the powder open, and means to generate a negative pressure in the transfer chamber (3), where the means to generate a negative pressure in the device (1) has a piston (11) which is moveable in the transfer chamber.
Abstract:
A powder conveying pump, in particular for a powder coating device. The pump comprises a working chamber with a variable working chamber volume, a powder inlet opening into the working chamber to suck powder into the working chamber, a powder outlet opening out of the working chamber to expel the powder present in the working chamber and a moveable piston that forms one boundary surface of the working chamber and sucks the powder into the working chamber through the powder inlet during an upward movement. The piston is driven directly by pneumatic means.
Abstract:
A nozzle assembly for a material application device includes an expansion chamber for slowing down the velocity of powder fed to the nozzle from a dense phase pump. The nozzle assembly includes a nozzle insert that forms the expansion chamber and provides air assist function. The nozzle includes an integral deflector, and further includes a passageway for a charging electrode so that the electrical path is routed away from the powder path, while permitting the electrode tip to be centered in the powder spray pattern from the nozzle. The nozzle also includes air wash for the electrode. The nozzle outlet orifice has a cross-sectional area that is equal to or greater than the inlet cross-sectional area so that a slow moving dense phase powder cloud is produced by the nozzle.