Metering apparatus for pourable bulk material
AssigneeRobert Bosch GmbH
InventorsGuenter Grossmann, Anton Ettenhofer
Life of this patent
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Abstract
A worm metering apparatus which includes a metering tube having an end, the end has an annular barrier element, made of sintered metal, that communicates with a negative-pressure source and an overpressure source gas source. A pressure meter is also provided, which measures the negative pressure that prevails in a line to the barrier element. To prevent the barrier element from becoming clogged with bulk material particles, the overpressure gas is conducted to the barrier element during the operation of the worm metering apparatus, in order to detach adhering particles of bulk material.
Claims3
A metering apparatus (1) for pourable bulk material, comprising a substantially vertically disposed metering tube (11) and a valve device for the bulk material, disposed on an end (10) of the metering tube, the valve device comprises a gas-permeable ring element (13) which includes pores that leaves a product admission cross section free and is made to communicate in alternation with a negative-pressure source (22) and an overpressure source (28), each of which are coupled to a control device (25), a dispenser device (12) for the bulk material is disposed inside the metering tube (11), and that a pressure meter (30) is connected into a line (21) which connects the ring element (13) to the negative-pressure source (22) and to the overpressure source (28), the pressure meter is connected to the control device (25) and a measurement of the pressure meter value serves to trigger the overpressure source (28).
A metering apparatus (1) for pourable bulk material, comprising a substantially vertically disposed metering tube (11), having a dispenser device (12) for the bulk material disposed inside the metering tube, a valve device disposed on an end (10) of the metering tube for the bulk material, the valve device comprises a gas-permeable ring element (13) that leaves an admission cross section free and the gas-permeable ring element communicates in alternation with a negative-pressure source (22) and an overpressure source (28), each of which are coupled to a control device (25), in which to block the valve device, the ring element (13) communicates with the negative-pressure source (22), in a line (21), which connects the negative-pressure source (22) to the ring element (13), the negative pressure is measured during the operation of the negative-pressure source (22);
- that the negative pressure is delivered as an input variable to the control device (25);
- and that if a limit value fails to be attained, the control device (25) triggers the overpressure source (28) during at least one subsequent metering phase.
Dependencies are inferred from the claim text.