Explosion-proof Positive Pressure Ventilated Power Distribution Cabinet

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Explosion-proof positive pressure cabinets are mainly divided into two types: positive pressure ventilation type and positive pressure compensation type.

The working principle of the positive pressure ventilation type is that the protective gas flows continuously through the positive pressure enclosure at a constant flow rate, maintaining the pressure within the normal range.

The positive pressure compensation type does not require continuous ventilation. The pressure inside the positive pressure enclosure is monitored in real-time by the control system, and the inflow and outflow of protective gas are effectively controlled by solenoid valves.

I. Scope of Application

1. Combustible dust environments: Zones 20, 21, 22

2. Hazardous locations with explosive gas mixtures: Zones 0, 1, 2

3. Explosive gas mixtures: IIA, IIB, IIC

4. Temperature classes: T1 to T6

5. When the air pressure exceeds 1000 Pa, the automatic control system opens the exhaust valve to adjust the internal pressure, ensuring the product is not deformed or damaged by high pressure impact.

6. When the air pressure drops below 50 Pa, the automatic control system triggers an alarm. The internal pressure needs to be adjusted. If the pressure is successfully replenished, the system automatically returns to normal. If unsuccessful, the system can be set to automatically cut off power if necessary.

7. Only when the cabinet pressure meets the specified requirements will the positive pressure purging control system provide a signal to power the cabinet.

8. Explosion-proof positive pressure cabinets are suitable for industries such as petrochemicals, offshore drilling platforms, metallurgy, pharmaceuticals, light industry, textiles, food, bioengineering, and aerospace engineering. They can operate at altitudes up to 2000 meters, with relative humidity below 95% at 25°C, and an ambient temperature range of -20°C to +40°C.

II. Main Technical Parameters

Advantages of Explosion-Proof Positive Pressure Cabinets

By filling with clean air or inert gas, the pressure inside the cabinet is maintained higher than the outside, preventing hazardous gases and dust from entering, thus achieving explosion-proof effects. They can be used in locations where flammable and explosive gases and dust are present.

Through the intake valve for gas supply and the exhaust valve for gas discharge, the cabinet maintains gas circulation, which also carries away the heat generated by the components, providing excellent heat dissipation. The heat emitted by the components is promptly dissipated, ensuring stable operation and extending the lifespan of the entire control system. Therefore, explosion-proof positive pressure cabinets are quite popular.

When selecting a high-quality, cost-effective explosion-proof positive pressure cabinet, pay attention to the following aspects:

1. Safety factor. The primary consideration when choosing an explosion-proof cabinet should be safety. Placing IT equipment for task execution in a lockable explosion-proof positive pressure cabinet gives network engineers peace of mind, as it limits the number of people who can open the cabinet.

2. Heat dissipation. Estimate the amount of heat generated by the equipment. Generally, the top of the cabinet is equipped with two to four cooling fans, and more fans are always better. External fans should be installed on the rear wall of the explosion-proof positive pressure cabinet, as most heat is generated at the back of electrical equipment. Generally, larger-capacity explosion-proof positive pressure cabinets have better heat dissipation effects.

3. Layout. The layout of the explosion-proof positive pressure cabinet is also crucial for its later use. Generally, more partitions are needed, along with ventilation openings. Some sheet metal used for securing cables should have rolled edges to prevent cable damage.

4. Price. Price is always a key concern for customers when selecting products. Therefore, the price of Shou'an explosion-proof positive pressure cabinets is absolutely consistent with the product's cost-effectiveness.