Gas separation – With nonliquid cleaning means for separating media – With automatic control of cleaning means
Reexamination Certificate
1999-11-29
2001-08-21
Simmons, David A. (Department: 1724)
Gas separation
With nonliquid cleaning means for separating media
With automatic control of cleaning means
C055S302000, C055S318000, C055S413000, C055S424000, C055S430000, C055S467000
Reexamination Certificate
active
06277162
ABSTRACT:
BACKGROUND OF THE INVENTION
Known apparatuses for depositing solids from an air current (EP 0 192 803) are provided with a bucket wheel lock, in the built-in drum of which a bucket wheel, which takes up an air current, is rotatably supported at the connection side. Coarsely particulate and finely grained solid particles are conveyed into this built-in drum over the connecting opening and the coarse particles are deposited by means of a screen, which forms the boundary of the built-in drum at the wall. The air current, still containing the dust-like fine particles, is passed over a pipe connection which, in the direction of the current, is behind the screen, into a dust filter, which must be cleaned at intervals.
SUMMARY OF THE INVENTION
The invention is concerned with the problem of combining the structural components for depositing coarse and fine solids from an air current into a common apparatus, for which, with little technical effort, the deposition of fine particles at the screen is prevented, a compact arrangement of the component parts enabling dust to be removed automatically with little control effort even when the dust filter is in the vicinity of the screen.
The inventive apparatus for depositing solids from an air current is constructed as a compact structural unit with dust filters disposed above the bucket wheel lock, the structural components being integrated in the depositing system in such a manner, that an optimum depositing process without any mutual effect on the functions is assured and, in addition to the coarse and fine filtering process taking place in a main direction flow, an automatic removal of dust from the apparatus can be carried out in the region of the fine filter.
This dust removal can be attained with little technical effort, few additional component parts and a simple, adaptable control. During the dust removal, a directional component to the region of a second discharging opening, located in the vicinity of the built-in drum, can be imparted by means of a deflection of the air current, which brings about a surface removal of dust, to the dust-containing air volume located behind the screen. With this deflection of the air current, deposits on the back side of the screen can be avoided already during the filtering operation. Over an additional transverse entry of air by means of a switching over of the controls of the apparatus, the deflection of the air current to the second discharge opening can be used for a rapid and automatically controllable cleaning in the region of the fine filter.
In the case of such a cleaning cycle, the dust filter is cleaned by means of a mechanical shaking apparatus and/or a current of cleaning air, which is switched on counter to the direction of flow of the apparatus, so that the dust residues, which are partially lumpy and detached from the dust filter, fall off and, under the action of gravity, are shifted in the direction of the back side of the screen. Simultaneously with this cleaning of the dust filter, clean, fresh air can be aspirated over the connecting opening of the bucket wheel lock in such a manner, that this air is pressed through the openings of the screen counter to the dust residues. In the region of the openings, baffles are provided, so that the fresh air, entering in the flow direction, experiences an essentially horizontal deflection, so that an air current, with a directional component towards the discharging opening of the subsidiary lock, is superimposed on the dust-containing air volume and the dust residues, falling off in the direction of the screen, reach the discharging opening and are transported away here.
To support the flow of this cleaning process, provisions are made, in a similarly acting construction or as an additional structural component, to build up above the back side of the screen an additional transverse conveying flow of air, which is switched on during the cleaning of the fine filter and deflects the dust particles to the subsidiary discharging outlet. The deflection process for cleaning the back side of the screen can be accomplished by means of an additional fan or by a compressed air cylinder with a nozzle, so that automatic cleaning process of the apparatus takes place at specified intervals through the agency of an appropriate control unit.
This automatic cleaning of the fine filter can be controlled by an optimum positioning of the bucket wheel, lying against the wall in the built-in drum, in combination with a decreased clean air suction effort of the main fan of the apparatus. While the fine filter is being cleaned (for example, by means of a shaking apparatus), a partial region of the screen is covered by means of bucket wheel positioned under the control of a sensor, so that the fresh air, aspirated in the region of the bucket wheel lock, can flow at a higher pressure through the screen into a region at a distance from the subsidiary outlet and, with that, the deposition of lumpy dust residues is avoided in this region through which there is flow. By swiveling the controlled bucket wheel, the screen is increasingly released for the flow of air and, with that, the discharge of dust residues over the whole upper region of the screen is attained.
REFERENCES:
patent: 1693754 (1928-12-01), Henry
patent: 1721778 (1929-07-01), Hancock
patent: 2114553 (1938-04-01), Woodford
patent: 2696025 (1954-12-01), Vandergriff
patent: 192803 (1986-09-01), None
Hoecker Polytechnik GmbH
Hopkins Robert A.
Jordan and Hamburg LLP
Simmons David A.
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