| 摘要 |
To relieve explosive pressures due to unintended explosion of explosive fluid, for example dust or combustible particle-laden air, such as sawdust, coal dust and the like, or of combustible gases, passing through a conveying duct (2, 5), a chamber is formed with a releasable closure, the inlet duct end (2a) from the inlet conveying duct terminating in the chamber. The chamber is formed by a cylindrical wall structure (3a) surrounding the inlet duct end (2a) with clearance. An explosion and/or flame detector (D) is located to sense an incipient explosion or flame and providing an electrical output signal. The chamber is subdivided into chamber portions, one in communication with the inlet duct end and the other communicating with the outlet from the chamber by a rapid-acting separating arrangement. In one form, the separating arrangement is a ring membrane which is distended between the walls of the chamber, under fluid pressure, released against the back of the membrane under control of the explosion detector (D); alternatively, the walls of the chamber can be perforated to form spray nozzles, through which under control of the detector, pressurized extinguishing medium is sprayed to form a sheet or curtain of extinguishing substance across the chamber.
|
