Protective shield for oxygen sensor
Abstract
Abstract A HEAT DISTRIBUTIVE PROTECTIVE SHIELD FOR A ZIRCONIUM DIOXIDE OXYGEN SENSOR, PARTICULARLY FOR INTERNAL COMBUSTION ENGINE EXHAUST SYSTEMS, IS ILLUSTRATED. THE SHIELD IS ARRANGED IN SURROUNDING RELATIONSHIP WITH RESPECT TO THE ZIRCONIUM DIOXIDE SENSOR BODY AND IS PROVIDED WITH A PLURALITY OF SPACED PERFORATIONS WHICH ARE ARRANGED TO DISTRIBUTE THE EXHAUST GAS HEATING TO THE SENSOR BODY TO PROVIDE UNIFORM THERMAL STRESSING OF THE ZIRCONIUM DIOXIDE MATERIAL. TO THIS END, THE DISTRIBUTION OF THE PERFORATIONS PROVIDES A GREATER NUMBER OF PERFORATIONS IN PROXIMITY TO ANY BODIES WHICH WOULD CONSTITUTE A HEAT SINK AND A LOWER NUMBER OF PERFORATIONS REMOTE FROM ANY HEAT SINK MATERIAL. THE PERFORATIONS MAY BE ARRANGED TO PROVIDE FOR A SWIRLING GAS FLOW BETWEEN THE SHIELD AND THE ZIRCONIUM DIOXIDE SENSOR BODY IN ORDER TO PREVENT PARTICULATES FROM IMPINGING UPON THE SENSOR SURFACE.
Inventors
- 👤 T Hemak
Bibliographic Details
Claims Analysis
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