| 摘要 |
PROBLEM TO BE SOLVED: To provide an explosion-proof speaker system of a pressure-resistant explosion-proof structure which can issue a large volume, in a place where an explosive atmosphere exists, such as a hazardous area.SOLUTION: An explosion-proof speaker system includes a speaker unit 10 having a vibration part 11 becoming a sound source, an explosion-proof case 20 having a shaft hole 24 and housing the speaker unit 10 in fixed state, a vibration transmission shaft 30 penetrating the shaft hole 24, and an isolation part 60 for cutting off the inside and outside of the explosion-proof case 20 between the vibration transmission shaft 30 and the shaft hole of the explosion-proof case 20. The isolation part 60 is provided between the outer end of the vibration transmission shaft 30 and the periphery of the shaft hole 24 of the explosion-proof case 20, by means of a bellows which does not become an obstacle of vibration of the vibration transmission shaft 30. |
