Method and device for controlling pressure in fire-resistance rating test furnace

The invention discloses a method and a device for controlling the pressure in a fire-resistance rating test furnace. The device comprises the fire-resistance rating test furnace, pressure sensors, PID (proportion integration differentiation) controllers, a computer, porous smoke-discharge pressure stabilization nets, a smoke collecting hood, a smoke discharge fan and a smoke discharge pipeline. According to the method, when fuel in the fire-resistance rating test furnace begins to burn, the pressure sensors in the furnace and the computer are used for sending actual in-furnace pressure data and set target pressure data to the PID controllers respectively, the PID controller is used for making comparison and analysis on the data and then sending a control instruction to the smoke discharge fan so that the rotation speed of the fan is regulated, and under the action of the smoke discharge fan, the smoke passes the test furnace, flows out of smoke discharge holes arranged at the top of the test surface, then pas