高燭光型キャップランプの防爆性
1985 年 101 巻 1165 号 p. 145-149
詳細
1985 年 101 巻 1165 号 p. 145-149
The development of high luminous safety cap lamps has been required in coal mines for a long time. But as the filament temperature of high luminous bulbs is higher than that of ordinary ones, high luminous bulbs have been considered to be unsuitable for use in coal mines.
Nevertheless, the authors consider, if high luminous bulbs were available, senior engineers or rescue crews would make use of them even though the usable time of batteries becomes short.
The authors-discussed the explosion-proofness of high luminous bulbs for safety cap lamps which were lighter compared with that of ordinary ones which were in everyday use in coal mines.
Experiments were carried out about explosion-proofness of high luminous safety cap lamps. Summary of the experimental results is as follows;
(1) It was confirmed that 1.4A-2 A bulbs of 2.5V rated voltage and 1A-2.5 A bulbs of 5V rated voltage were safe to methane-air mixture.
(2) As for the gases sealed in bulbs, krypton bulbs were about 20% lighter than argon bulbs under the condition that all these bulbs were of identical rated voltage and current.
(3) Compared with the argon bulbs of 2.5V-1.3A, the krypton bulbs of 2.5V-2A, 5V-1A and 5V 2.5A were respectively about 1.5, 3 and 3.7 times as bright as the argon bulbs.
