| 摘要 |
FIELD: arrangements or devices for treating smoke or fumes. ^ SUBSTANCE: head comprises gas supply pipe with gas gate and protecting shield mounted outside and coaxially at the top end of the gas supply pipe. The protecting shield is composed of two baffles made of two hollow trancated cones mounted one on the other. The grater base of the top baffle faces downward, and that of the bottom baffle faces upward. The smaller base is connected with the gas supply pipe. ^ EFFECT: enhanced reliability and prolonged service life. ^ 2 cl, 2 dwg |
