Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1994-08-03
1998-05-26
Walberg, Teresa J.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219202, 219541, 338204, 338260, 338320, 338314, H05B 306
Patent
active
057569711
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is based on a heater arrangement for a measuring sensor for determining components in gases, particularly in exhaust gases of internal combustion engines, according to the generic type of the main claim.
2. Description of the Related Art
From DE-OS 2,913,866 it is known, in a planar measuring sensor, to dispose two heating elements electrically insulated from the measuring element and among themselves by an insulating layer in two planes, one above the other. Each of the two heating elements uses a heat-conducting track and two heater connection tracks, which are positioned with respect to the side of the measuring sensor facing away from the measured gas such that they can respectively be connected to a current source there.
SUMMARY OF THE INVENTION
In contrast, the heater arrangement having the characterizing features of the main claim has the advantage that the heating capacity is increased, so that the measuring sensor possesses a shorter readying time for regulation. Particularly when used as rod heaters in lambda sensors, an improvement in the sensitivity with respect to impurities is additionally achieved.
Advantageous modifications and improvements of the heater arrangement disclosed in the main claim are possible with the measures outlined in the dependent claims. A particularly high heating capacity can be attained when the heat-conductor tracks of the individual heating elements are configured to have at least partially a meandering shape. A particularly homogenous temperature distribution is achieved when, with a heat-conducting track segment guided inside and one guided outside, the inside heat-conducting track segment is configured to be wider than the outside heat-conducting track. To avoid thermal overload, it is advisable to make the spacings of two adjacent heat-conducting tracks in one plane as large as possible, and the heat-conducting tracks have a minimum spacing from the edge of the ceramic substrate.
BRIEF DESCRIPTION OF THE DRAWING
A plurality of embodiments of the invention are represented in the drawing and described in detail in the following description.
FIG. 1 shows an exploded representation of two heating elements, each having a heat-conducting track that has an inside and an outside segment,
FIG. 2 shows an exploded representation of two heating elements, each having a heat-conducting track extending at the edge of a ceramic substrate,
FIG. 3 shows an exploded representation of two heater elements, each having a heat-conducting track extending to the inside from the outside,
FIG. 4 shows a special embodiment of the heater arrangement according to FIG. 2, in which respectively an outside heat-conducting track has a meandering-shaped course,
FIG. 5 shows an exploded representation of a heating element disposed between two heater connection tracks, and FIG. 6 shows an exploded representation of four heating elements.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The embodiments represented in the drawing each show heating elements having the course of a heat-conducting track, heater connection tracks and heater terminals; but not the ceramic insulating layers disposed between the heating elements. In conjunction with the exploded representations, however, it is easily conceivable that a ceramic insulating layer be disposed, on the one hand, between the heating elements and, on the other hand, the heating elements and heater terminals.
The embodiment according to FIG. 1 shows a first heating element 10 and a second heating element 11. An insulating layer 1 is disposed between the two heating elements 10 and 11. The insulating layer 1 is composed of, for example, one or a plurality of ceramic wafers of Al.sub.2 O.sub.3, onto whose two large surfaces the heating elements 10 and 11 are printed, for example by means of a tungsten printing paste.
The two heating elements 10 and 11 each have a heat-conducting track 20, 21 and a heater connection track 30, 31. The heat-conducting track 20, 21 extends on the two l
REFERENCES:
patent: 1125889 (1915-01-01), Smith
patent: 2518941 (1950-08-01), Satchwell et al.
patent: 3071749 (1963-01-01), Starr
patent: 3518756 (1970-07-01), Bennett et al.
patent: 3999004 (1976-12-01), Chirino et al.
patent: 4109377 (1978-08-01), Blazick et al.
patent: 4164539 (1979-08-01), Johnston
patent: 4300990 (1981-11-01), Maurer
patent: 4568908 (1986-02-01), Laskaris et al.
patent: 4630024 (1986-12-01), Allen
patent: 4697165 (1987-09-01), Ishiguro et al.
patent: 4883947 (1989-11-01), Murase et al.
patent: 5199791 (1993-04-01), Kasanami et al.
patent: 5332991 (1994-07-01), Kojima et al.
Easthom Karl
Robert & Bosch GmbH
Walberg Teresa J.
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