# US 6,293,153 B1 · Device for gravimetric metering and pneumatic suction conveying of fluidizable bulk materials

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- Number: US 6,293,153 B1
- Document ID: US6293153B1
- Status: Granted
- Kind: B1
- Application number: 09/426,915
- Filed: 1999-10-26
- Granted: 2001-09-25
- Earliest claimed: 1998-11-04
- Assignees: Wacker Chemie AG
- Inventors: Burkhard Grune; Helmut Huber; Dieter Duschl
- Web page: https://patentgrep.com/patent/US6293153B1

## CPC

- B65G 53/66: Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material {(controlling the flow of coal firing systems C21B5/003)}
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)

## Abstract

A device for the metering of fluidizable bulk materials, having a storage tank and a mass-flow-measuring device for the material and a fluidizing device, which is connected to the storage tank via an aperture of adjustable size, and a control valve for controlling the supply of compressed air to the fluidizing device, wherein a pressure gauge is provided downstream of the fluidizing device, in the direction of flow, and the pressure gauge and control valve are connected via a first control circuit, and the supply of compressed air to the fluidizing device is metered by this control circuit in such a manner that a constant, in each case preselectable subatmospheric pressure prevails in the fluidizing device, and the mass-flow-measuring device and the aperture of adjustable size are connected via a second control circuit, and the size of the adjustable aperture is set by this control circuit in such a manner that a defined quantity of bulk material enters the fluidizing device.

## Claims

### Claim 1

A device for the gravimetric metering of fluidizable bulk materials in a suction-conveying system, comprising a
storage tank having a mass-flow-measuring device for material contained in said storage tank;
a fluidizing device, which is connected to the storage tank via an aperture of adjustable size;
a control valve for controlling a supply of compressed air to the fluidizing device;
a pressure gauge provided downstream of the fluidizing device, in flow direction;
the pressure gauge and the control valve are connected via a first control circuit, and the supply of compressed air to the fluidizing device is metered by this control circuit in such a manner that a constant, in each case preselectable subatmospheric pressure prevails in the fluidizing device;
the mass-flow-measuring device and the aperture of adjustable size are connected via a second control circuit, and the size of the adjustable aperture is set by means of the second control circuit in such a manner that a defined quantity of bulk material enters the fluidizing device.

### Claim 2 (depends on 1)

The device as claimed in claim 1, comprising
a second valve which allows fluidizable material to be branched off from the suction line and, if appropriate, to be guided into a return vessel, is provided downstream of the pressure gauge, as seen in the flow direction.

### Claim 3 (depends on 2)

The device as claimed in claim 2,
wherein the second valve is incorporated in the first control circuit.

### Claim 4 (depends on 1)

The device as claimed in claim 1,
wherein the mass-flow-measuring device is a “loss in weight” mass-flow-measuring device.

### Claim 5 (depends on 1)

The device as claimed in claim 1,
wherein the first control circuit and the second control circuit are linked to form a combined control circuit.