Explosion-proof spiral exhaust pressure relief device for mine

An explosion-proof spiral exhaust pressure relief device for mine, comprising an explosion-proof pressure relief housing, and a first explosion-proof pressure relief inner core,

• wherein an exhaust cavity is arranged inside the explosion-proof pressure relief housing in an axial direction, the exhaust cavity is open at one end of the explosion-proof pressure relief housing, and another end of the explosion-proof pressure relief housing is provided with pressure relief holes communicating with the exhaust cavity;
• the first explosion-proof pressure relief inner core is arranged in the exhaust cavity;
• and an outer wall of the first explosion-proof pressure relief inner core is provided with two first explosion-proof spiral pressure relief channels;
• wherein at least one second explosion-proof pressure relief inner core is also arranged between the explosion proof pressure relief housing and the first explosion proof pressure relief inner core;
• each of the at least one second explosion-proof pressure relief inner core is of a rod-shaped structure, and an outer wall of each of the at least one second explosion-proof pressure relief inner core is provided with at least one second explosion proof spiral pressure relief channel;
• an accommodating cavity is arranged inside each of the at least one second explosion-proof pressure relief inner core;
• wherein the at least one second explosion-proof pressure relief inner core comprises at least two second explosion-proof pressure relief inner cores, the accommodating cavity is configured for accommodating the first explosion-proof pressure relief inner core or a further one of the at least two second explosion-proof pressure relief inner cores;
• for every two adjacent second explosion-proof pressure relief inner cores of the at least two second explosion-proof pressure relief inner cores, a gap between an outer diameter of the at least one second explosion-proof spiral pressure relief channel on an outer wall of an inner one of the two adjacent second explosion-proof pressure relief inner cores and an inner diameter of an accommodating cavity of an outer one of the two adjacent second explosion-proof pressure relief inner cores is from 0.03 mm to 0.6 mm.