Device for separating solid or liquid particles from a stream of

Details Device for separating solid or liquid particles from a stream of Device for separating solid or liquid particles from a stream of

1997-02-10

1999-06-22

Smith, Duane S.

Gas separation

Mounted or supported for continuous motion

55406, 55408, 55437, 55467, 55DIG3, 15350, 15353, B01D 4514

Patent

active

059144165

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The invention relates to a device for separating solid or liquid particles from a stream of gas, in particular a vacuum cleaner.
A device of this kind is known from OS 21 53 664. Which comprises a vacuum cleaner, in which dust-laden air is sucked through a suction tube by a fan. Connected upstream of the fan is an impeller, towards whose axis the opening of the suction tube is directed. Upstream of the impeller, there is located a dust collecting container surrounding the suction tube. By means of a screw-thread shaped channel, the dust collecting container is linked to the impeller.
In the known solution, it has proven that the particle separation from the stream of gas is only incomplete.


SUMMARY OF THE INVENTION

The invention is therefore based on the problem of improving the phase separation in a device of this kind.
As a result of the development, according to the invention, of the known device, there is generated, in the region of the opening of the suction tube, an air vortex which transports the particles outwards. There, the particles are to be further transported into the dust collecting container by a secondary vortex induced in the dust collecting container. It is essential in this connection, that the solid or liquid particles to be separated are transported out of the stream of gas. It may be provided, in this connection, that the impeller is formed by the fan wheel. Because of the straight-line opening of the dust collecting container, extending through in the direction of the impeller, the particles, accelerated by impinging upon the impeller, are seized by the secondary vortex and transported out of the stream of gas, so that the particles may deposit in the dust collecting container. To intensify the development of secondary vortices, the ratio of dust container diameter and impeller diameter should preferably assume values greater than 2. A development of the invention provides that the impeller is located, in the direction of flow, before the fan wheel. By this means, the phase separation takes place before the fan wheel, so that the fan wheel is not impinged upon by particles. In this arrangement, it proves advantageous for the stream of gas to pass in axial direction through the impeller. The particles accelerated tangentially on impinging upon the blade surfaces then move in a substantially stationary vortex about the impeller axis and, as a result of the centrifugal force, reach the edge of a impeller chamber, from which, as a result of the gravitational force or of the induced secondary vortex, they are transported into the dust collecting container. The impeller chamber has, preferably, a funnel-shaped form and ends cone-shaped in the direction of suction. The impeller is preferably two-bladed. The blades may be disposed, according to a preferred development, in the region of the tip of a cone-shaped sieve, the cone widening in the direction of the stream of gas. The rotational speed is to amount to from 10,000 revolutions per minute. By this means, there is provided an effective impulse transfer to the particles from the blades or from the bars of the sieve.
A compact structural shape is achieved when the impeller, the sieve and the fan wheel are joined to one another as a material unit. The cone-shaped sieve has apertures which are interrupted in the circumferential direction by bars. The aperture width and the bar height are, with regard to the rotational speed and to the maximum speed of the gas, matched to one another in such a way that the particles passing through the apertures when the sieve is rotating are always met by the bar and are thus spun out of the sieve. The cone-shaped sieve form is especially suitable for this mechanism. Another development of the invention provides that the suction tube, in the region of the dust collecting container, is surrounded by a funnel-shaped screen. By this means there is minimised the formation of the induced secondary vortex in the region of the base of the dust collecting container.


BRIEF

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