Gas separation: processes – Filtering – With cleaning of filter
Reexamination Certificate
1999-01-28
2001-04-17
Barry, Chester T. (Department: 1724)
Gas separation: processes
Filtering
With cleaning of filter
Reexamination Certificate
active
06217638
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the cleaning of grilles for filtering the cooling air of radiators of gaseous and liquid fluids and more particularly of radiators for various engines working in dusty air loaded with solid particles suspended in the air.
BACKGROUND OF THE INVENTION
A typical application of the invention is for example cleaning the grilles of oil and water radiators of movable devices, such as loaders, compactors or graders for the treatment of waste or the compacting of soil.
The radiators of these devices are provided with grilles for filtering air that cools the radiators and which is forced through said grilles.
These are pierced with a large number of holes or passages of small dimensions through which the dust and solid particles in suspension in the air cannot pass, thereby more or less greatly obstructing the grilles.
Periodically, it is necessary to clean the surface of these filtering grilles, so as to eliminate the impurities which are held and retained thereon and various systems for cleaning these filtration grilles are already known, by brushing or blowing, whose principle is well known.
These cleaning systems are either difficult or even impossible to mount, because they are bulky, particularly on loaders, or complicated in design, use and maintenance.
SUMMARY OF THE INVENTION
The object of the invention is to provide a simple and effective means adapted to clean periodically these grilles in an automatic and effective manner.
To this end, the invention has for its object a process for controlling the cleaning of a grille for filtering the cooling air of a radiator, particularly of engines, through which the cooling air is forced by means of a ventilation system, the cleaning being carried out by blowing with the aid of at least one blower sweeping tangentially the surface of the grille, characterized in that it consists in controlling said blower as a function of a parameter connected to the regime or the flow of the ventilation system and/or each time or at the same time as said regime or flow falls to a predetermined level or below this latter.
According to an embodiment of the above process, more particularly adapted for engines of the loader type or the like, said parameter is a signal generated upon passage of the speed selector into a reverse movement position, this signal being adapted to be, in the case in which the engine is provided with a backup signal, the actuation current of this latter.
The invention also has for its object a device for practicing this process, adapted for an engine in which the cooling air is forced by the aid of a ventilation system, said device comprising a filtration grille, on at least one side of which is disposed a tangential blower and reserve of compressed air, connected to said blower via an electromechanical control device, characterized in that the filtration grille has a transverse cross-section of undulant profile, said blower having, at one of the ends of each groove in the form of a conduit formed by the grille, a jet or the like for sweeping the groove, and in that said control device of the blower is connected to means actuated as a function of the regime or of the flow of the ventilation system when said regime or flow is reduced to zero or nearly zero.
According to one application of the invention to engines, of the loader type or the like, provided or not with a backup signal and whose ventilation system is actuated by the engine motor, said means actuated as a function of the regime of the ventilation system are constituted by a timer activating for a predetermined time a relay for supplying an electrovalve permitting the sending of air under pressure into said blower, said timer being actuated by a signal generated by the speed selector of the engine, such that the blower will be operated each time the selector is actuated for reverse motion, which is to say concomitantly with the minimum regime of said ventilation system, the engine motor being decelerated.
Preferably, the blower is actuated only if the air pressure in said reservoir is above a predetermined level.
The device of the engine thus ensures cleaning both automatically and effectively, on the one hand thanks to the undulant configuration of the filtration grille, which increases the filtration surface and, on the other hand, by the placement of the jets of the blower at one end of the U-shaped grooves of the grille, thereby ensuring powerful tangential sweeping over all the surface of the groove and along all its length.
Such sweeping is systematically controlled as soon as, when the engine is actuated, the forced air ventilation regime for cooling of the radiator or radiators, with water or oil or any other liquid or gaseous fluid, is sufficiently low and particular when it is minimal, which is the case particularly at each manipulation of the speed change selector to move to reverse motion, the engine motor being necessarily decelerated and hence the ventilation system, connected to the motor regime of the engine, also operating at a minimum.
In the case of the use of the invention with engines of the loader type or the like, whose ventilation system is actuated independently of the motor of the engine, the control of the blower will be triggered for example from a preprogrammed control or not, periodic or not, or the ventilation system. This control of the ventilation system can consist, for example, of temporarily feathering, for about several seconds, the blades of the ventilation system, said feathering giving rise to actuation of said blower.
REFERENCES:
patent: 3716968 (1973-02-01), Mischke
patent: 5616171 (1997-04-01), Barris et al.
patent: 29 23 465 (1980-12-01), None
patent: 0 269 765 (1988-06-01), None
patent: WO 95/07748 (1995-03-01), None
Barry Chester T.
Young & Thompson
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