When designing explosion-proof products, engineers often consider issues related to product structure and manufacturing processes. A reasonable product structure not only has good explosion-proof performance, but also reduces the number of process steps, making it more economical and practical.
1、 Explosion proof design requirements for product structure
1. When arranging the connecting parts and internal electrical components of explosion-proof (d) fluorescent lamps with multiple chambers, possible pressure overlap should be considered.
2. When the transparent parts and metal components of explosion-proof (d) electrical appliances and lamps are matched, IIA and IIB should use metal wrapped flame-retardant elastic pads or metal pads, or directly match, while IIC should use adhesive. The fluorescent lamp glass tube must be matched with the shell in order to be glued.
3. Reasonable utilization of large-diameter cable entry device and anti pull device.
4. Reasonable utilization of wall thickness and tension bars for explosion-proof type (d) shell. However, using tension bars does not necessarily reduce wall thickness, and it is important to avoid sudden changes in the design structure curve inside 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) appliances and lighting fixtures with built-in power sources (batteries or other energy storage components), consideration should be given to battery short circuits, which may cause temperature rise or self explosion.
7. Pay attention to the delayed opening of 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 type (e) casing need to be protected.
9. Measures should be taken to prevent the sealing ring used for protection from falling off.
10. Attention should be paid to the connection between the lamp legs and the lamp holder of the increased safety (e) all plastic dual foot fluorescent lamp.
11. The increased safety type (e) lamps should consider the aging of the lamp tube, which causes the ballast to heat up, and the uneven pulse overheating at the limit life of the tube type fluorescent lamp, which causes the lamp holder to burn out.
12. Reasonable selection of internal wiring terminals and reasonable confirmation of terminal quantity for increased safety (e) junction boxes.
13. Pay attention to the special requirements for the internal battery 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 static warning signs
15. Tighten contact lamps (when the threaded structure of the wiring cavity is used for Class IIC, the wiring cavity should be reinforced again or an isolation sealing device should be used. For Class IIB, it is necessary to consider whether the net cavity volume is less than 2 liters, otherwise it should be the same as before.
2、 Requirements of Explosion proof Design for Product Process
1. Explosion proof type (d) IIC electrical appliances or lamps with threaded explosion-proof and lamp pressure plate threaded structures should pay attention to the accuracy of fit and the quality of thread processing
2. Special consideration should be given to the welding method/process of steel plate welding products and the strength and thickness of the steel plate. This type of product is rarely damaged 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. During assembly, electronic components or wiring terminals inside the explosion-proof (d) casing should be avoided as much as possible to create multiple chambers and pressure overlap.
5. The shell of explosion-proof type (d), whether cast by sand mold or pressure casting, 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, adhesive force and strength should be considered to prevent the components or cables that are sealed or glued from falling off under stress or being pulled out by explosive strength.
7. When assembling explosion-proof (d) products, the requirement for uniform torque of the explosion-proof surface fastening bolts should be considered, and the torque requirements for fastening bolts during installation and maintenance should be clearly stated to the user.
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