Measuring and testing – Volume or rate of flow – Tank type
Reexamination Certificate
1997-08-07
2001-05-29
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Tank type
C073S861351, C073S861354, C222S077000
Reexamination Certificate
active
06237409
ABSTRACT:
SPECIFICATION
The invention finds application in technology for batch measurement by weight and concerns a device for determining in particular the transfer rate and/or the metered-out amount of a continuously generated stream of bulk material.
Known from DE-OS 3634994 is a centrifuge in which the fluid separated from the suspension is removed to the rotating periphery of the drum and the kinetic energy remaining therein is recovered through external devices. However, such a device is not usable for bulk materials.
In a known device for metering out bulk material (CH-PS 362 542) the bulk material passes from an intake funnel onto a rotating disc with a perpendicular axis and is led on this from the feed point to a removal point, where it is stripped off the rotating disc by means of a stripper. The rotating disc is arranged upon a weighing device, with which the weight of the bulk material on the rotating disc can be determined. Such a device has only a limited measuring precision and an overall size that is too large in relation to the achievable transfer rate.
In view of the fact that a small overall size is to be achieved, the task forming the basis for the invention is to generate a small stream of bulk material with high velocity (similar to a water stream from a nozzle), which stream can then finally be directed towards a suitable measuring apparatus. The measuring apparatus deflects the bulk-material stream and, from the centrifugal force resulting thereby, determines the transfer rate, which is used for the metering out of the bulk material. This task is accomplished by causing bulk material to flow into a rotating cylindrical vessel adjacent its axis, and using an inclined blade adjacent the inner periphery of the vessel to lift material from the vessel and direct it into a trajectory impinging upon a deflecting element which develops a reaction force which can be measured and is proportional to the rate at which material impinges on the element.
Suitable as measuring apparatus and sufficiently well-known in bulk-material technology are flow-through measuring devices with bent chutes or impact plates, which deflect the bulk material (as known from DE 2947414).
A further measuring apparatus is known from DE 3717615. Here, through a sensible arrangement of the measuring wheel mentioned therein, for the invention at issue the bulk-material stream can be directly coupled into the measuring wheel.
The device for producing a stream of bulk material makes provision for bringing the bulk material into a rotating pot axially through a tube. The bulk material moves towards the edge zone of the pot owing to acceleration and centrifugal force, and ultimately fills the entire pot up to the axial entrance.
A blade arranged on a non-rotating part of the pot dips into the rotating material cake in a counter-rotating manner in the edge zone and in doing so leads the bulk-material stream out.
Attainable advantages and features of such an arrangement include the following:
The device according to the invention may be implemented so as to be sealed.
Bulk materials from dusts up to small granules can thus be adequately measured or metered out in a manner friendly to the environment.
The device requires no flexible connections such as those that solve problems of ventilation and pressure compensation in the known systems in bulk-material measurement technology.
The device can have a very low overall height.
It is suitable for being directly connected by means of a flange onto silo outlets on the side of the structure, but can also be supported on the floor.
The bulk-material stream is free of pulsations and it is distinguished by a highly constant product flow.
The device provides a direct and quick measurement and regulation apparatus and can work virtually without idle time, in consequence of the high bulk-material velocity (e.g. 10 m/sec.).
The measurement apparatus can have small dimensions in relation to the achievable transfer rate.
REFERENCES:
patent: 3805904 (1974-04-01), Zimmerer
patent: 4805462 (1989-02-01), Labschies
patent: 5289724 (1994-03-01), Häfner
patent: 5353647 (1994-10-01), Toerner
patent: 5394747 (1995-03-01), Häfner
patent: 362 542 (1962-06-01), None
patent: 0 292 723 (1988-11-01), None
patent: 0 615 113 (1994-09-01), None
Patel Harshad
Shlesinger & Arkwright & Garvey LLP
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