The use and utilization of fire and smoke exhausting equipment is the most important development situation for us. For us, the most widely used equipment in life is the use and utilization of fans. Smoke exhausting fan for fire fighting With the use of this type of fan equipment, at present, most people use centrifugal fans to face the problem of unstable fan speed. What is the situation?
Between the motor rotor and the commutator, carbon powder or carbon brush itself is not good. In line with the principle of easy to repair and difficult to repair, the adjustable resistance is first measured, and the resistance changes regularly with the adjustment. It proves that the potentiometer is good, and there is no problem in measuring SCR.
Because the diode is a large current sealed tube, the screws on one end are fastened to the circuit board, and the other end is welded to the circuit board by wire. When the circuit board is removed, it is found that the positive and negative pole is loose.
Mechanical smoke control system is composed of air supply and exhaust pipe, pipe well, fire damper, door switch equipment, sending and exhausting fan and other equipment. The setting of smoke control system is positive pressure inside staircase. The smoke exhaust volume of mechanical exhaust system is directly related to smoke prevention zone.
In the front room or the front room of the smoke prevention staircase, when the open balcony, concave corridor or the open window with different directions facing the front door is used for natural exhaust, there is no smoke extraction facility in the staircase.
The natural smoke exhaust should be placed above the room. It should be located within 800mm below the ceiling or roof. The spacing should be measured at the lower edge of the exhaust vent. The natural air intake should be below the room and 1/2 below the net height of the room. The distance between them is at the upper edge of the inlet. To the smoke prevention zone, the farthest point should be within 30m. Natural smoke exhaust windows, smoke outlets and air outlets should be equipped with convenient and flexible opening devices.
One of the four rectifier diodes has only one problem adjustable resistor. The cabinet type centrifugal fan is installed on the control panel because of the adjustable resistor. The frequency is very high and the time is long. There are also many problems in SCR, usually short circuit, open circuit, no trigger or poor internal contact.
Tags: Axial fan Smoke exhausting fan for fire fighting