Measuring and testing – Fluid pressure gauge – Combined
Reexamination Certificate
1999-10-26
2001-09-25
Oen, William (Department: 2855)
Measuring and testing
Fluid pressure gauge
Combined
Reexamination Certificate
active
06293153
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a device for gravimetric metering and pneumatic suction conveying of fluidizable bulk materials.
2. The Prior Art
The metering and pneumatic conveying of the metered quantities of fluidizable bulk materials is fundamentally known. The materials can be conveyed from a storage tank into a receiving vessel by means of pressure conveying or by means of suction conveying. DE 4,109,960 A1, in column 1, second paragraph, mentions the advantages of suction conveying over pressure conveying and describes an installation for pneumatic suction conveying in which measures are taken in order to minimize the risk of blockage.
Another problem of suction conveying is the metering accuracy of the bulk material which is conveyed. In the past, volumetric metering of the bulk material has been known for suction conveying. Due to the changing subatmospheric pressures in the receiving vessel and therefore in the conveying line, this method is unsuitable for accurate metering of the bulk material. For this reason, suction conveying has in the past been unsuitable in particular for modern production installations in which it is necessary to meter changing bulk materials with a high level of accuracy.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a device which allows fluidizable bulk materials to be metered with a high level of accuracy under the conditions of suction conveying.
The above object is achieved by the present invention which provides 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. A pressure gauge is provided downstream of the fluidizing device, in the flow direction 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 means of this control circuit in such a manner that a defined quantity of bulk material enters the fluidizing device.
The mass-flow-measuring device is preferably a “loss in weight” mass-flow-measuring device.
The device according to the invention preferably comprises a valve, which allows fluidizable material to be branched off from the suction line and, if appropriate, to be returned to a return vessel, downstream of the pressure gauge, as seen in the direction of flow.
REFERENCES:
patent: 155611 (1970-03-01), None
patent: 27 14355 (1978-10-01), None
patent: 32 01105 (1983-10-01), None
patent: 40 14229 (1991-11-01), None
patent: 40 14 229 (1991-11-01), None
patent: 41 09 960 (1992-10-01), None
patent: 195 42 787 (1995-11-01), None
patent: 44 43053 (1996-06-01), None
patent: 0297463 (1989-01-01), None
English Derwent Abstract corresp. to DE 40 14229 A1 (above).
English Derwent Abstract corresp. to DE 27 14355 A1 (above).
Summary corresp. to DE 155611 (above).
English Derwent Abstract [1997-282104 [26]] corresp. to DE 195 42 787 A1.
English Derwent Abstract [1991-333655[46]] corresp. to DE 40 14 229 C2.
English Derwent Abstract [1992-332906[41]] corresp. to DE 41 09 960 A1.
English Derwent Abstract [1983-737046[33]] corresp. to DE 3201 105 C1.
English Derwent Abstract [1996-287315[29]] corresp. to DE 44 43 053 A1.
Duschl Dieter
Grune Burkhard
Huber Helmut
Collard & Roe P.C.
Oen William
Wacker - Chemie GmbH
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