DE1244722B - Device for suspending powdery substances in a gas stream - Google Patents

Description

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GERMAN

PATENT OFFICE

EDITORIAL

German class: 12 e- 4/01

Number: 1244722

File number: C28196III / 12e

Filing date: October 17, 1962

Opened on: June 20, 1967

The invention relates to a device for suspending powdery substances in a gas stream, in other words, for the purpose of converting a powdery substance into a flowable one To spend state.

There are already devices known for this purpose, in which the gas flow in a dense the closed container contained in it to be suspended in powder form is initiated, and is sucked in through a central tube extending from its bottom, in order to be drawn into to ascend this and then in the opposite direction of flow an annular space between them Tube and an outer tube coaxial with it to flow through, which the air at the level of the ig in it left powder in order to take it with it in a whirling motion. Here is the outer of the two nested tubes slidably arranged on the inner tube and is supported with it their lower end depends on the surface of the powder, the level of which corresponds to its sinking follows.

This known device is imperfect with regard to the effect that can be achieved, in particular because the air, before it becomes effective for atomization, traverses the long narrow ring channel between the two Must flow through pipes.

The device according to the invention also has two coaxial tubes, one of which in the other and the outer tube slides on the surface of the powder in the container supports, but in particular avoids the mentioned disadvantage of the known device, wherein In addition, thanks to their innovative training, additional advantages from the point of view of effect and adjustability of the air effective for atomization and also its speed accordingly the amount of powder to be carried with a given volume of air.

The device according to the invention in the form of a closed container containing the substance to be suspended, into which the gas flow is introduced, is characterized by a fixed immersion tube which is vertically arranged in the container and is open at the bottom, through which the air is introduced into the container and which is enclosed by an outer sleeve which slides tightly on it and which is extended in its lower part by an inwardly conical projection which has slots for the outlet of the blown gas. In this socket there are also devices for suspending shoes lying on the surface of the powder supply in the container
powdery substances in a gas stream

Applicant:

Compagnie de Saint-Gobain,

Neuilly-sur-Seine (France)

Representative:

D1pi.-Ing. R. H. Bahr

and Dipl.-Phys. E. Betzier, patent attorneys,

Herne (Westphalia), Freiligrathstr. 19th

Named as inventor:

Rene Mattmuller, Malakoff, Seine (France)

Claimed priority:

France of October 17, 1961 (876 188) -

attached, by the action of which the lower part of the socket constantly adjusts the level of powder in the Container according to the lowering of the same can follow.

The device is described below as an example to which the invention is in no way restricted according to the invention described in detail with reference to the figure.

The embodiment of such a device shown in the figure in vertical axial section consists of a container 1 for receiving the powdery substance, the level of which is denoted by 3 is. This container is closed by a cover 4, which is attached to a cross member 6 by bolts 5 is attached. A nut 7 is fixed to this traverse into which a threaded shaft 8 is screwed with a knurled knob which is attached to a plate 9, which is located on the bottom of the container 1 is supported. This arrangement allows the lid to be easily braced with the Container and releasing from this.

In the axis of the cover 4, a dip tube is attached to it, which consists of an inner part 10 screwed into the cover and an outer part 11 which can be displaced on this inner part via a bushing 10 . The part 11 is guided on the part 10 by a collar 13 arranged at the lower end of the latter part. The outer part 11 of the dip tube ends in a conical tip 14, in

709/617 / 45O

which slots 15 extending after the generatrix of the cone are provided.

On the outer part 11 of the dip tube 16 shoe-like organs 17 are attached by rods, which rest on the level of the powdery substance.

The pressurized gaseous medium passes through a line 18 which is in a through a Line 20 opens with the interior of the part 10 of the dip tube connected channel 19, a. The amount the supplied gaseous medium is regulated by a center screw 21.

The pressurized gaseous medium emerges from the part 10 via the slots 15 in the level of the powdery substance and brings it into suspension. That in such a flowable state transferred powder leaves the container through a pipe socket 22.

As can be understood without further explanation below, the extent to which the Level of the powdery substance contained in the container is lower, the outer part 11 of the Dip tube so that the slots 15 always remain in this level.

By means of a diversion 23 or a center screw 24 arranged in this, the amount of be regulated by one and the same volume of carrier gas entrained powder.

With the overall arrangement, a device, which the container continuously from a storage container supplied with the powder, combined.

The device described above can operate at very high pressures and makes it possible to set the ratio of powder to carrier gas very precisely. For example, the carrier gas can enter the container containing the powder under a pressure of 5 kg / cm ² , the pressure of the powder introduced into the gas in a flowable state then being 500 g / cm 2 at the outlet of the container.

The new device can be used to suspend any powdered substance to bring in a gas stream consisting of an appropriately selected gas. In particular it is suitable for centrifuging and fine distribution of heat-meltable powdery Substances for the metallization process. For this purpose it can advantageously with Fan burners, in particular plasma burners, are combined.

Claims (3)

Patent claims: 1. Device for suspending powdery substances in a gas stream, which in a closed container containing the substance to be suspended is introduced, characterized by a vertically arranged fixed immersion tube (10), open at the bottom, through which the air is introduced into the container and which is enclosed by an outer sleeve (11) sliding tightly on the tube (10) is, which in its lower part by an inwardly conical extension part (14) is extended, the slots (15) for the passage of the injected gas, wherein at the Also, boots resting on the upper surface of the powder supply in the container (17) are attached, through the action of which the lower part of the socket is constantly up to the level of the Powder in the container according to the lowering of the same can follow. 2. Device according to claim 1, characterized by a lid which can be placed tightly on the powder storage container, in which the channels for the supply and discharge of the gas and the regulating devices arranged in these are recessed, and on which the vertically immersed into the container, from the advancing one Sleeve surrounded pipe (19) is rigidly attached, and that the lid is also equipped with devices (5, 6, Ί, 8), which secure its tight contact with the opening of the container. 3. Apparatus according to claim 2, characterized by one of the provided in the lid Channel for the supply of the gas branched off bypass channel (23) through which a portion of the pressurized gas immediately without closing the interior of the container happen after the outlet pipe (22) is passed. Considered publications:
German Patent No. 943 201;
Austrian Patent No. 3,084;
French patent specification No. 1092247. 1 sheet of drawings 709/617/450 7. 67 ® Bundesdruckerei Berlin