The positive pressure cabinet is composed of a positive pressure chamber and a control chamber. The positive pressure chamber is used to install various non-explosion-proof instruments or electrical appliances. The control chamber consists of an explosion-proof control box and a pressure control system. The positive pressure cabinet shell is welded with 2 ~ 3mm cold-rolled steel plates, the ventilation pipe is made of galvanized steel pipe, and the incoming and outgoing cables are made of through-board pipe joints and cable entry and compression devices. The front door is equipped with a glass display window to display instruments and indicators. It is designed, manufactured, and inspected according to the national standard GB3836.5-2004 "Positive pressure type "P" for electrical equipment for explosive gas atmospheres". It can be widely used in dangerous places with explosive gas and dust such as petroleum, chemical industry, medicine and so on. The explosion-proof mark is ExpxdmbICT4 ExpxdmbIBT4.
The positive pressure cabinet is composed of a positive pressure chamber and a control chamber. The positive pressure chamber is used to install various non-explosion-proof instruments or electrical appliances. The control chamber consists of an explosion-proof control box and a pressure control system. The positive pressure cabinet shell is welded with 2 ~ 3mm cold-rolled steel plates, the ventilation pipe is made of galvanized steel pipe, and the incoming and outgoing cables are made of through-board pipe joints and cable entry and compression devices. The front door is equipped with a glass display window to display instruments and indicators. It is designed, manufactured, and inspected according to the national standard GB3836.5-2004 "Positive pressure type "P" for electrical equipment for explosive gas atmospheres". It can be widely used in dangerous places with explosive gas and dust such as petroleum, chemical industry, medicine and so on. The explosion-proof mark is ExpxdmbICT4 ExpxdmbIBT4.
1. Structure overview
The positive pressure cabinet is composed of a positive pressure chamber and a control chamber. The positive pressure chamber is used to install various non-explosion-proof instruments or electrical appliances. The control chamber consists of an explosion-proof control box and a pressure control system. The outer shell of the positive pressure cabinet is welded with 2 ~ 3mm cold-rolled steel plates, the ventilation pipes are made of galvanized steel pipes, and the incoming and outgoing cables use plate-through pipe joints and cable entry and compression devices. The front door is equipped with a glass display window to display the instrument and indicator lights.
2. Working principle
1. After the external 380V or 220V AC power is introduced into the explosion-proof control box, press the "start button", the solenoid valve opens the intake pipe, the compressed air enters the positive pressure chamber after being filtered and decompressed, and the dangerous gas in the positive pressure chamber is exhausted The valve discharges the positive pressure cavity. When the dangerous gas in the positive pressure cavity is changed to a safe value, the air exchange is completed and the interlock contact is automatically closed. At this time, the electrical appliances and instruments in the positive pressure cavity can work.
Three, safety instructions
The pressure in the positive pressure cavity is greater than 500pa, automatic exhaust
Automatic alarm if the pressure in the positive pressure chamber is less than 100pa
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