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Requirements for product structure and process in explosion-proof design of explosion-proof electrical lighting fixtures

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| 2020-06-22|Return


When designing explosion-proof products, engineers often consider issues related to product structure and technology. A reasonable product structure not only has good explosion-proof performance, but also reduces process steps, making it more economical and practical.

1、 Requirements for product structure in explosion-proof design 

1. When arranging the connecting parts and internal electrical components of explosion-proof (d) fluorescent lamps, possible pressure overlap should be considered.

2. When cooperating with transparent parts and metal components of explosion-proof (d) electrical appliances and lamps, IIA and IIB should use metal coated fire-resistant elastic pads or metal pads, or directly cooperate, while IIC must use adhesive. The fluorescent lamp glass tube must be glued together with the housing.

3. Reasonable utilization of large diameter cable introduction device and anti stripping device.

4. Reasonable utilization of wall thickness and tension bars of explosion-proof (d) shell. However, using tie bars does not necessarily reduce wall thickness, and attention should be paid to avoiding sudden changes in the internal design structural curves of the shell.

5. Explosion proof (d) integrated lighting fixtures should consider the reasonable layout of starting components to reduce the influence of temperature inside the light source chamber.

6. For explosion-proof (d) electrical appliances and lamps with built-in power supply (battery or other energy storage components), battery short circuit should be considered, which may cause temperature rise or self explosion.

7. Pay attention to the delayed opening of the cover for the discharge of energy storage components and cooling of heating components inside the explosion-proof (d) shell

8. The live parts inside the increased safety (e) casing should be protected.

9. The sealing ring used for protection should take measures to prevent it from falling off.

10. Attention should be paid to the connection between the lamp legs and the lamp holder for the increased safety (e) full plastic double legged fluorescent lamp.

11. For increased safety (e) lamps, consideration should be given to the heating of the ballast caused by the aging of the lamp tube and the uneven pulse overheating during the extreme life of the tube type fluorescent lamp, which can cause the lamp holder to burn out.

12. Reasonable selection of internal wiring terminals and confirmation of the number of terminals in the increased safety (e) junction box.

13. Pay attention to the special requirements for the internal batteries of the increased safety (e) product

14. To avoid the generation of electrostatic charges caused by ignition on the surface of non-metallic shells, one of the following methods can be used: A limit the surface resistance value, B limit the surface area, C set up electrostatic warning signs

15. Tight contact lamps (when the threaded structure of the wiring chamber is used for Class IIC, the wiring chamber should be reinforced again or an isolation sealing device should be used. Class IIB should consider whether the net chamber volume is less than 2 liters, otherwise the same as before.).

 2、 The requirements of explosion-proof design for product technology 

1. Explosion proof type (d) IIC electrical appliances or lighting fixtures should pay attention to the accuracy of the fitting and the quality of thread processing for the explosion-proof and lighting fixture pressure plate thread structure

2. Special consideration should be given to the welding method/process of steel plate welding products, as well as the strength and thickness of the steel plate. This type of product rarely explodes during strength testing. But it is difficult to pass the internal ignition non explosion test after the overvoltage test.

3. Pay attention to the preparation process and accuracy requirements of non-metallic material samples to prevent dispersion and deformation of sample performance.

4. Explosion proof (d) electronic components or wiring terminals inside the shell should be assembled to avoid causing multiple cavities and pressure overlap.

5. The shell of explosion-proof type (d), whether it is sand cast or pressure cast, must undergo aging treatment to eliminate casting pressure and fully ensure the strength and parameter indicators of the shell.

6. When manufacturing adhesive or sealing processes, consideration should be given to adhesion and strength to prevent components or cables that are sealed or sealed from falling off under force or being pulled out due to explosive strength.

7. When assembling explosion-proof (d) products, the requirement of uniform torque for fastening bolts on the explosion-proof surface should be considered, and the torque requirements for tightening bolts during installation and maintenance should be clearly indicated by the user.

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