Threaded flameproof structure: a safe design scheme for spiral channels to block flame propagation

The threaded flameproof structure provides a unique and efficient solution for blocking the flame propagation with its exquisite spiral channel structure. From high-precision thread design to rigorous parameter control, the structure confines the explosion hazard to the inside of the lamp by extending the flame propagation path and enhancing the heat exchange efficiency.
When an explosion occurs inside an explosion proof solid state lighting lamp due to an electrical fault or other reasons, the high-temperature flame will try to spread to the outside through the joint of the lamp housing. The threaded structure processes high-precision threads at the joint of the housing, so that the flame must meander along a spiral narrow channel. Compared with the planar structure, this spiral path greatly increases the contact area between the flame and the metal wall, and the originally short heat exchange process is stretched several times. As the flame crawls along the thread gap, the metal wall continues to absorb the heat of the flame and quickly dissipates it into the surrounding environment. As the heat continues to lose, the temperature of the flame has dropped below the ignition point of the combustible material when it reaches the outside of the housing, thereby completely losing the ability to ignite external flammable and explosive gases or dust, effectively preventing the spread of explosion hazards.
Key parameters such as the pitch, tooth type and engagement length of the thread must all undergo professional engineering calculations and a large number of simulation tests. The pitch determines the distance the flame travels in the threaded channel. A pitch that is too wide may cause the flame to pass quickly, weakening the explosion-proof effect; a pitch that is too narrow will increase the difficulty of processing and the complexity of assembly. The pitch needs to be accurately set according to the explosion-proof level and application scenario of the lamp to ensure that the flame has enough heat dissipation time when passing through the thread gap. Tooth type design is also crucial. Common triangular and rectangular tooth types have their own characteristics, and they need to be selected by comprehensively considering mechanical strength and sealing performance. The engagement length is directly related to the compressive resistance of the thread structure. When subjected to internal explosion pressure, sufficient engagement length can prevent the thread from deforming or disengaging, ensuring the integrity of the explosion-proof structure.
In the gas environment underground in coal mines, the requirements for explosion-proof lamps are extremely stringent due to the suddenness and high destructiveness of gas explosions. The explosion proof solid state lighting lamp with a threaded explosion-proof structure can confine the flame inside the lamp at the moment of gas explosion by effectively blocking the flame through the spiral channel, avoiding secondary explosions and buying precious time for miners to evacuate and rescue. In the oil refining workshop, facing various flammable and explosive chemicals, this structure also performs well. Even if a small explosion is caused by sparks generated by circuit failure inside the lamp, the threaded explosion-proof design can ensure that the flame cannot leak out, prevent the explosion accident from expanding, and ensure the safety of workshop equipment and personnel.
The threaded explosion-proof structure perfectly integrates mechanical engineering and thermodynamics principles through in-depth research and ingenious design of the physical process of flame propagation. From the structural innovation of the spiral channel to the precise parameter optimization, every design detail serves the core goal of "preventing flame propagation".