Basic structure of explosion-proof and increased safety explosion-proof electrical products

Explosion-proof, increased-safety and other electrical products can be made of cast aluminum alloy, steel plate, unsaturated polyester plastic and other materials.

Explosion-proof electrical product shell structure requirements

1. The flameproof plane joint surface of the flameproof enclosure must conform to the "three elements" flameproof joint surface L, l, flameproof gap, surface roughness. The accuracy of the flameproof joint surface of the flameproof enclosure shall be ≥6G/6g, and the number of engagement buckles shall be ≥5.

2. The flameproof enclosure should be able to withstand the requirements of the dynamic pressure test; the maximum pressure of the enclosure is 1.5 times the reference pressure, and the pressure rise rate and the reference pressure rise rate should not differ too much.

3. Flameproof enclosure should be able to withstand the requirements of static pressure test; IIB 1.5Mpa IIC 2.0Mpa (t: 10s ~ 12s)

4. The flameproof enclosure should be internally ignited without exploding. Placed in a test tank for a detonation test.

5. The observation window material should withstand the high and low temperature resistance test; the relative humidity (90±5)%, the temperature is higher than the maximum working temperature environment 20 °C for more than 120h, and the minimum working temperature environment is 24h.

6. The observation window material shall withstand the thermal drastic test. At the highest working temperature, it was sprayed with (10 ± 5) ° C, 1 mm diameter spray water without breaking.

7. The observation window material should withstand the aging test.

8. Explosion-proof casing should consider anti-corrosion grade W (outdoor), WF (moderate anti-corrosion outside the house), WF1 (moderate anti-corrosion outside the house),

9. Protection level IPXX.

10.IPX0 (to prevent solid foreign matter from entering X: number;

11.IP0X (to prevent harmful effects from water ingress). X: number

12. Explosion-proof casing sealing materials must be waterproof, anti-aging, oil resistant and other properties.

13. Explosion-proof housing feet must have sufficient strength.

14. Explosion-proof housing inlet and outlet pressure nuts and flame-proof joint fastening screws must have sufficient mechanical strength.

Increased safety electrical product shell structure requirements:

1 The outer shell structure must withstand the impact energy of mechanical strength of 7J without cracks and damage; the 1kg steel hammer is equipped with an impact test of φ25mm hammer head dropped by h height.

2 The outer casing structure must have good sealing performance.

3 The outer casing material must meet the requirements for the tracking index.

4 The outer casing material must withstand high and low temperature tests without affecting its explosion-proof requirements.

5 other relevant requirements, etc.

Specification for explosion-proof electrical products

Explosion-proof electrical product specification requirements:

1. Determine the category according to the use environment of explosion-proof electrical products: Class I or Class II, Class III;

2. Determine the gas, steam and dust levels (A, B, C) in an explosive environment according to the environment in which the explosion-proof electrical products are used;

3. Determine the temperature group according to the use environment of the explosion-proof electrical products (T1, T2, T3, T4, T5, T6);

4. Determine the protection level requirement (IPXX) according to the use environment of the explosion-proof electrical products;

5. Determine the anti-corrosion level requirements according to the use environment of explosion-proof electrical products (W, WF, WF1)

6. According to the use environment of explosion-proof electrical products, it is determined that the electrical components used in the increased safety housing must be flameproof electrical components.