| 摘要 |
PURPOSE:To protect the detection section from external blow during transportation and mounting an exhaust tube and stabilize characteristics by projecting a flammable protection tube made of a fibrous material that comprises cellulose as its main ingredient from the end face on the side of a main metallic exhaust tube. CONSTITUTION:The detection section side 12 of an insulation body 12 is made to project long from the mounting screw 3a so that an oxygen detection section 11 seated in the concave groove 12a of the insulation body 12 in main metallic body is inserted deep into the exhaust tube of a combustion device, and the upper cylindrical section 12c with a larger diameter of the insulation body 12 is supported by a stepped bearing face that engages the section 12c. After a sealing compound 4 comprising minute powder of talc, graphite, etc. is filled in an annular space that is formed on the outside of the head section 12d that is a continuation from the cylindrical section 12c with a smaller diameter, the upper brim of the main metallic body is tightened 3c to give sealing to both. A protection tube 6 that surrounds the inspection section 11 and fittingly contacts the inner peripheral face of the mounting screw 3 for the main metallic body is formed with flammable paper, cloth, etc. that are made of a fibrous material that comprises cellulose as its main ingredient. |
