防爆正壓櫃深度剖析

最近, 客戶對防爆正壓櫃的諮詢激增. 由於學科的特殊性，一些基本問題似乎不清楚. 對此作出回應, 給大家分享一些防爆正壓櫃的必備知識.

1. 定義

一個 防爆正壓櫃 is a type of explosion-proof enclosure featuring an internal positive pressure control system that automatically adjusts its internal pressure. These cabinets are primarily made of stainless steel 304 or steel plate and are customized in size based on customer requirements.

2. Gas Environments

Designed for hazardous locations with 霹靂 氣體混合物: Zones 0, 1, 和 2. They are applicable in environments with explosive gases found in petroleum, 化學, 製藥, 畫, and military facilities.

3. 適用範圍

Primarily used in petroleum and chemical industries, as well as military installations, they are generally suitable for Classes IIA, IIB, 國際積體電路公司, and environments with T1 to T6 explosive gases or vapors. Their usage is intended for areas with an altitude not exceeding 2000 meters and atmospheric temperatures ranging from -20°C to +60°C. Internal components can accommodate various standard electrical devices, such as meters, 斷路器, 交流接觸器, 熱繼電器, inverters, 顯示, ETC。, as required by the design specifications.

4. Structural Features

There are three main structural designs: box type, piano key type, and upright cabinet type. The box type is usually made of stainless steel 304, featuring a brushed or mirrored finish, with access to internal components via the front door. The other two, piano key and cabinet types, employ similar welding processes, with a brushed or powder-coated finish. All join surfaces of the enclosure undergo explosion-proof sealing.

5. Control System

The control system is a highly advanced electrical setup. It operates when the internal working pressure of the cabinet ranges between 50Pa and 1000Pa. When the pressure exceeds 1000Pa, the system’s pressure relief valve automatically opens the exhaust device until the pressure drops below 1000Pa, protecting the internal electrical components from damage. If the pressure falls below 50Pa, the system triggers an alarm, with flashing lights and sound to alert on-site personnel, resuming normal operation once re-pressurization is successful.

6. Technical Parameters

1. Explosion-proof grade: ExdembpxIICT4;

2. 額定電壓: AC380V/220V;

3. 防護等級: Options include IP54/IP55/IP65/IP66;

4. Cable entry: Customized according to client requirements, such as top-entry/bottom-exit, top-entry/top-exit, ETC.

7. Usage Experience

Based on years of manufacturing experience, electricians should operate according to the provided electrical schematics. Regular replacement of aging internal components is recommended, typically every two years. The ventilation system should be frequently cleaned. Particularly in harsh operational environments, external seals should be replaced annually to ensure the normal functioning of the gas supply system. If the gas supply system is damaged, it is advised to purchase a new set from the supplier to avoid incompatibility issues.

This comprehensive guide on explosion-proof 正壓 cabinets aims to enhance understanding and provide valuable insights for those interested in this technology.