Air filter especially for cleaning combustion air for internal c

Details Air filter especially for cleaning combustion air for internal c Air filter especially for cleaning combustion air for internal c

1997-11-26

1999-04-13

Woo, Jay H.

Gas separation

Combined or convertible

In motor vehicle

55505, 55506, 55514, 55DIG28, B01D 4602

Patent

active

058939377

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an air filter, especially for the air intake of internal combustion engines.
Such an air filter is disclosed in German Patent 42 41 586. This known filter can be used anywhere, i.e., it can be used both in motor vehicle manufacture and in earth-moving machines or construction machines. The filter inserts of these air filters are replaced after a certain period of time. Depending on the amount of dust involved, the useful life of an air filter can be from a few days (construction machinery) to several months.
Especially in machines or vehicles which are used in very dusty areas, it is necessary to remove the dust from the housing continuously or at intervals. In the state of the art a dust discharge opening is provided for this purpose.
It has been found in such filter systems that various applications necessitate adaptations regarding the filter insert, the pore size or the addition of safety elements or the like. Thus it is desirable to match the filter system to the particular application, and of course the adaptation is to be made reasonably economical.


SUMMARY OF THE INVENTION

The object of the present invention therefore lies in the creation of a filter which makes possible an improved adaptation of the dust discharge for various applications.
This object is achieved, setting out from the preamble of the principal claim, by its distinctive features.
The advantage of the invention is that, with a single replaceable element, a series of filter systems is created which is optimally adaptable to operating conditions. At the same time the replaceable element is essentially a part which on the one hand closes the housing of the air filter and on the other hand has an opening for discharging the dirt, which can be provided with various elements and which itself can be configured to permit an optimal separation of the dirt.
According to one advantageous embodiment of the invention, a cyclone for preliminary separation of dust is provided at the raw air intake. This cyclone consists of vanes which produce a swirling flow and thus separate a great amount of dirt from the raw air. The cyclone can be configured as a radial cyclone or also as an axial cyclone. The dirt separated passes into the system adapted to the housing opening and is discharged cyclically or continuously.
According to an advantageous embodiment, a dust dumping valve is provided for discharging dirt. A dirt collecting chamber is placed in the housing cover ahead of the dust dumping valve. On account of the pulsation of the aspirated air, which develops in internal combustion engines due to the reactive effect of the engine's valve movements, the dust dumping valve opens and closes, so that a nearly continuous dust removal takes place.
In another embodiment the dirt collecting chamber is integrated with the dust dumping valve. The latter supplements or replaces the dirt collecting chamber disposed in the housing lid.
An alternative embodiment of the invention consists in the arrangement of a valve with deflector at the dirt dumping opening. Such a valve has a very low resistance to flow, so that dust removal is performed even by very weak pulsations.
Another embodiment of the invention, which is advantageous especially where no pulsation is present, consists in providing a partition in the housing lid, which has an opening. Under this partition the dirt collects for removal. Due to the cyclone effect a certain overpressure occurs in the chamber under the partition, which suffices to open the valve cyclically to discharge the dust.
According to a further embodiment, the integrated dirt dumping can be connected to a system for aspirating the dust--for example an ejector system by which the dirt is then carried through the exhaust line to the open air.
These and additional features of preferred embodiments of the invention will be found not only in the claims but also in the description and the drawings, and the individual features can be realized each singly or plurally in the form of subco

REFERENCES:
patent: 3785129 (1974-01-01), Szmutko
patent: 4605426 (1986-08-01), Thornburgh
patent: 4720292 (1988-01-01), Engel et al.
patent: 5484466 (1996-01-01), Brown et al.
patent: 5569311 (1996-10-01), Oda et al.
patent: 5685985 (1997-11-01), Brown et al.

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