Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1997-02-07
1999-09-07
Tran, Hien
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
422173, 422177, 422180, 422199, 60300, 29890, F01N 310
Patent
active
059483717
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a catalytic converter for cleaning exhaust from combustion processes as well as a manufacturing method therefor, with only so-called metallites according to the species being affected.
Known catalytic converters are subject to problems with non-high-strength construction, especially when the catalytic converters are used in motor vehicles. The continuous mechanical stress as well as thermal expansion, especially in so-called "starter cats" that are heated electrically when beginning operation, pose serious problems.
SUMMARY OF THE INVENTION
The goal of the invention is to propose a catalytic converter with high mechanical strength construction and good compensation of thermal expansion as well as a manufacturing method therefor.
This goal is achieved in a catalytic converter according to the species as well as in a method for manufacturing such a catalytic converter according to the invention.
According to the invention, therefore, packets are initially made from a plurality of metallic, corrugated, and flat foils, preferably by laser welding, said packets being high-strength and mechanically stable in themselves and capable of withstanding thermal stresses. These packets are provided with electrically heatable foils, added into or onto them. These likewise flat, preferably plane heatable foils can also be positively connected with the corrugated foils by welding, said welding being performed only in the metallic area with exclusion of the resistance heating layer. The advantage consists in the good, strong connection of the foils, which have a good heat conducting connection through direct metallic contact with one another.
In the mounted state, the entire unit is then coated with the catalytically active layer, by dipping for example.
By the subsequent application of the catalytically active coating, conversion also takes place in the area of the electrically heatable foil, with the coating also serving as protection for the foil heating. However, it is particularly advantageous that the electrical resistance heating layer of the electrically heatable foil is completely free of any mechanical stress and therefore cannot be damaged even by vibrations at the contact points with other foils and/or sheets, because a good heat-conducting connection with the packet exists only in areas outside the electrical resistance heating layer.
BRIEF DESCRIPTION OF THE DRAWINGS
One preferred embodiment of the invention will now be described in greater detail with reference to the drawings.
FIG. 1 shows a catalytic converter in a schematic cross section (Section I--I) according to FIG. 2;
FIG. 2 shows the catalytic converter according to FIG. 1 in a schematic top view;
FIG. 3 shows detail III in FIG. 1;
FIG. 4 shows the detail in FIG. 3 on a smaller scale;
FIG. 5 shows a section V--V according to FIG. 2;
FIG. 6 shows an electrically heatable foil in a schematic top view; and
FIG. 7 shows detail VII in FIG. 3 in a partially cut away view on a larger scale.
FIG. 8 shows an alternative embodiment of the electrically heatable foil in a top view;
FIG. 9 shows a section IX--IX in FIG. 8; and
FIG. 10 shows an alternative embodiment of the coating of the electrically heatable foil in FIG. 9.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In a housing, designated 10 as a whole in FIG. 1, a plurality of channels 11 (FIG. 3) is provided, said channels running parallel to one another and consisting of intermediate spaces formed between a corrugated foil 12 (FIG. 7). Corrugated foils 12 and flat, plane foil 13 are welded together at contact areas 14 (FIG. 7) which contact areas 14 may be points or lines forming a packet 15. Packets 15 are passed areawise through housing 10 and fastened immovably therein by spot welds 16, for example.
In addition, an electrically heatable foil 17 (FIG. 6) is provided, which in the embodiment shown has on its front side two electrically conducting resistance heating layers 21, 22 extending between terminal areas 18, 19 and applied to an e
REFERENCES:
patent: 5094074 (1992-03-01), Nishitawa et al.
patent: 5174968 (1992-12-01), Whitenberger
patent: 5505911 (1996-04-01), Hajele
Heraeus Electro-Nite International N.V.
Tran Hien
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