POWDER FEEDING DEVICE, IN PARTICULAR FOR COATING POWDER

摘要

The present invention relates to a powder feeding device (100), in particular for coating powder. The powder feeding device (100) comprises a dense phase powder pump (1) which has at least one conveying chamber (4) with a powder inlet valve (7) and a powder outlet valve (8). Furthermore, a control device (90) is provided for selectively operating the dense phase powder pump (1) in a powder conveying operating mode or a flushing operating mode. The powder inlet valve (7) and the powder outlet valve (8) of the dense phase powder pump (1) are configured in each case as a pneumatically actuable compression valve which can be closed when an actuating pressure is applied. It is provided according to the invention that the control device (90) is configured to set the pressure value of the actuating pressure which is selected for closing the powder inlet valve (7) and/or powder outlet valve (8) preferably automatically and more preferably selectively automatically depending on the respective operating mode of the dense phase powder pump (1) and/or depending on a pressure which prevails in the conveying chamber (4).

主权项

1. A method for selectively operating a dense phase powder pump in a powder feed operating mode or a flushing operating mode, wherein the dense phase powder pump comprises at least one feed chamber having a powder inlet valve and a powder outlet valve, and wherein the powder inlet valve and the powder outlet valve are each designed as a pneumatically operating pinch valve configured to be closeable upon application of a selected actuating pressure, wherein
the actuating pressure selected to close the powder inlet valve and/or powder outlet valve is set:
as a function of the operating mode of the dense phase powder pump;as a function of a pressure prevailing within the feed chamber;as a function of an amount of compressed carrier gas supplied to the feed chamber per unit of time in the powder feed operating mode; and/oras a function of an amount of coating powder conveyed by the dense phase powder pump per unit of time in the powder feed operating mode.