Heating arrangement

Details Heating arrangement Heating arrangement

1998-03-06

2000-04-04

McMahon, Marguerite

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123574, F02M 3107, F02M 3502, F02D 2108

Patent

active

060448296

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a heating arrangement for warming gases.
A device is disclosed in DE-AS 23 43 185 in which fuel is vaporized in the air intake system of an internal combustion engine by means of hot exhaust gases. For this purpose a heat exchanger is disposed in the intake tube, which is equipped with porous elements through which a fuel-air mixture flows. A portion of the exhaust gases is passed through this heat exchanger. A disadvantage of such systems is that an additional element, namely the heat exchanger element, is necessary, with the result that the cross section of the passage is very greatly reduced. This necessarily increases the resistance to flow. Also, other elements for varying the temperature of gases are known. For example, DE 20 42 907 shows a tube which has a tubular coil within the wall, in which a temperature varying means is introduced. This construction, however, is very complicated and only in the area of the wall does it produce a variation in the temperature of the medium flowing through it.
It is the object of the invention to avoid the aforementioned disadvantages and to provide a heating arrangement for warming gases which will not decrease the flow resistance and which can be produced by simple means.
This object is achieved by the characterizing part of the main claim.
The important advantage of the invention is that it does not require an additional heating element, such as a heating grid for example; instead an element which is disposed in the passage is used for transferring the thermal energy. This element, in an advantageous embodiment of the invention, is a valve which has at least one metal valve plate. On this metal plate, a cold conductor or a resistance heating element is disposed. The transmission of heat to the metal plate provides for a uniform heating of the surroundings, i.e. of the gases flowing through the passage.
The heating arrangement serves to prevent the freezing of ducts through which the crankcase gases of an engine are passed. Especially after a cold start of the engine, and in the case of cold, moist ambient air, the line through which the crankcase gases are conveyed to the clean air area of an air filter can ice up. This icing is effectively prevented by means of the cold conductor or by means of the resistance heating element.
According to one embodiment of the invention, the valve which is provided for vacuum regulation is utilized. Such a valve is arranged at the entrance of the duct carrying the crankcase gases to the clean air part of the air filter, and under operating conditions in which only a very low vacuum prevails in the clean air part of the air filter, it serves to assure a sufficiently great vacuum in the crankcase. Of course, it is also possible to equip a pressure limiting valve which limits any very high suction pressure in the clean air part of the air filter to a maximum level, with a metal valve plate and to provide this metal valve plate with the heating element.
A further embodiment of the invention envisons enclosing the valve parts in an injection molded synthetic resin body. This has the advantage that the valve parts are merely snapped or locked together and the plastic part gives the valve its final form. This reduces the difficulty of assembly, and also a reliable seal is assured.
An alternative embodiment of the invention consists in providing the duct for conveying the crankcase gases with a tube carrying cooling water. This tube extends substantially in the core of the duct and thus likewise provides for a uniform warming of the gases surrounding the tube. Such a combination is especially simple to produce, and has the advantage that no electrical energy is required.
These and other features of preferred embodiments of the invention will be found not only in the claims but also in the description and the drawings.
Exemplary embodiments of the invention are illustrated in the drawings and are desribed in further detail below. In the drawings,
FIG. 1 shows a valve with a heating arrangement,
FIG. 2 shows a v

REFERENCES:
patent: 3088447 (1963-05-01), Henderson
patent: 4768493 (1988-09-01), Ohtaka et al.
patent: 5024203 (1991-06-01), Hill

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