Housing for gas sensors

Measuring and testing – Gas analysis – Gas of combustion

Patent

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Details

73 3105, 204426, G01N 27407

Patent

active

055467873

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention concerns a housing for gas sensors.
Such a housing is known from German 3 410 122 A1.
One drawback to the known housing is its many separate components, which make it complicated and hence expensive to assemble. Although it does include a two-part ceramic shape, it is divided along a plane perpendicular to the axis of the overall housing. The housing must accordingly be assembled axially. The contacts are slipped over the plate-like member, producing a notching effect and the risk of damaging the metal, which the actual sensor is mounted on. The many structures required for securing the plate-like member and the separate electric connections also contribute to the complexity of assembly.


SUMMARY OF THE INVENTION

The object of the present invention is accordingly to make a generic housing for gas sensors as recited in the preamble to the major claim simpler and easier to assemble.
The object is surprisingly attained in accordance with the invention in a generic housing as recited in the preamble to the major claim by the characteristics recited in the body of that claim.
A housing with a ceramic shape consisting of preferably only two similar halves is simpler to manufacture. The plate-like member is inserted between the halves and the contacts into the open slots. The halves are, in contrast to the state of the art, joined radially and are inserted into the housing in that state. There are no such relative motions as forcing the contacts over the plate-like member in accordance with the present invention. The risk of damage during assembly is accordingly minimized. The result is a simple and easy-to-assemble housing and very little waste.
To eliminate errors due to outside air entering either such a pressurized environment as an exhaust pipe or such an evacuated environment as the flue in a heating system or analysis tube, the actual detection point, specifically the front of the plate-like member, is sealed off gas tight from the rear of the housing. It is preferred to establish the seal from outside by way of a contact between two conical sealing surfaces. The seal can be further tightened with additional sealing lips or annular seals or both to force the convex conical surface against the concave conical inner surface of the threaded bushing. The tightness between the cone and the plate-like member can be further increased by cement or glazing or by packing the convexity with (ceramic) powder, preferably in funnel-shaped depressions near where the plate-like member to be accommodated emerges.
It is of particularly great advantage to test and assemble the not yet completely finished gas sensor without disturbance from electric connections in the form of cables. It is also possible to provide connections in accordance with each customer's specific needs, simplifying maneuvering and adaptation to his specific application. The housing can then be finally assembled subsequent to preliminary assembly and testing in that the areas of the contacts extending beyond one side of the housing half, integrated along with the electric connections into a plug, are thrust over or into a separate protective housing with a socket on separated connecting cable. The product can then be finished by either the manufacturer or the customer once the probe has been inserted. The separated protective housing can then be manufactured with the protective housing already in place, by for example snapping, welding, or screwing it together, by securing it with specially designed clips, or otherwise.
Advantageous embodiments and advanced versions of the invention are recited in the subsidiary claims.


BRIEF DESCRIPTION OF THE DRAWINGS

One preferred embodiment of the invention will now be specified with reference to the drawing, wherein
FIG. 1 is a schematic longitudinal section through one embodiment of the housing with the contacts in place and with a sensor resting on the plate-like member,
FIG. 2 is a schematic top view of the ceramic shape from FIG. 1,
FIG. 3 illustrates one o

REFERENCES:
patent: 4784743 (1988-11-01), Iino et al.
patent: 5098548 (1992-03-01), Duce
patent: 5238551 (1993-08-01), Katsu et al.
patent: 5246562 (1993-09-01), Weyl et al.

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