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Explosion-proof performance of explosion-proof electrical products

Explosion-proof performance of explosion-proof electrical products

Explosion-proof electrical products are safe electrical products used in environments where flammable and explosive gases, vapors, and dust may exist during the production, operation, storage, transportation, use, and disposal of hazardous chemicals. It refers to live equipment that can be operated and used safely in this dangerous environment without causing the surrounding explosive mixture to explode.

Common sense of explosion-proof electrical in factories

For example: explosion-proof electrical appliances, explosion-proof telephones, explosion-proof speakers, explosion-proof walkie-talkies, explosion-proof handheld megaphones, explosion-proof intrinsically safe telephones, explosion-proof couplers, explosion-proof camera shields, explosion-proof amplifier telephones, explosion-proof telephone stations, explosion-proof broadcast alarms, etc. .

The explosion-proof performance of explosion-proof electrical products is mainly achieved by the following types:

1. Take effective measures to isolate or relatively isolate electrical sparks, arcs and dangerous high temperatures that may be generated by electrical products from explosive mixtures, to avoid ignition and explosion in the use environment; for example: flameproof enclosure type and encapsulation type, etc.

2. The purpose of preventing ignition is achieved by limiting the ignition energy in the circuit; for example: intrinsically safe type.

3. Take a series of measures to avoid electric sparks, arcs and dangerous high temperatures from electrical equipment or circuits; for example: increased safety type, etc.

Explosion-proof electrical products are divided into two categories: factory use (Class II) and coal mine use. How to choose these products correctly?

1. Products with an explosion-proof qualification certificate issued by the designated inspection agency of the country should be selected to confirm the legality and production capacity of the manufacturer. At the same time, it is necessary to prevent some companies from using multiple certificates or forging certificates. When purchasing large quantities, check whether the drawings and technical documents approved by the nationally recognized inspection agency are consistent with the supplied products and the inspection and test report.

2. The purchased explosion-proof electrical products should ensure that the explosion-proof mark is consistent with the area division, level and temperature group of the applied hazardous location.

3. The explosion-proof parameters in the product brand are complete, such as explosion-proof mark, explosion-proof certificate number, and related specific parameters.

4. Explosion-proof products should have necessary warning signs. For example, explosion-proof products without interlocking devices should clearly state "It is strictly forbidden to open the lid when power is on"; plastic shell products without static electricity treatment should clearly state "wipe with a damp cloth when cleaning" to prevent electrostatic ignition.

5. Appearance judgment of explosion-proof electrical products:

1. The shell volume of explosion-proof electrical products should be relatively large to ensure a certain heat dissipation capacity. This is particularly important for lamps. The cast aluminum alloy shell of explosion-proof products must have a certain thickness. First, it can withstand the internal explosion pressure so that the shell will not deform or break; second, it can continue to ensure its explosion-proof performance during use and after maintenance.

2. The seal between the transparent part of the observation window of the electrical equipment of the flameproof enclosure structure and the shell must be glued, and rubber gasket seals are not allowed.

3. Be sure to ensure that the inner diameter of the rubber sealing ring in the introduction device of the explosion-proof electrical product is consistent with the outer diameter of the cable in the engineering design.

In addition, the impact of other special conditions in the environment in which explosion-proof electrical products are applied must also be considered, such as corrosion, salt spray, high temperature and humidity, or sand, dust and rain.

Tag: explosion-proof electrical, explosion-proof telephone, explosion-proof amplifier telephone

Details

  • Bei Lan Jiang Lu, Yuyao Shi, Ningbo Shi, Zhejiang Sheng, China
  • Eric Tu

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