The main structural principle of fire smoke exhaust fan manufacturers:
The exhaust valve of the fire exhaust fan is basically the same as the fire valve in the body structure, and the control box is slightly different. The valve is normally in a normally closed state. When a fire alarm occurs, the steel cable can be pulled, or the DC24V power supply is turned on by the fire control center, the electromagnet acts, the movable iron core hook is disengaged, and the valve is quickly opened by the opening spring force. Smoke exhaust.
Then, the cam on the blade shaft of the fire exhaust fan presses the micro switch to make the normally open contact open, and outputs a valve opening signal and an interlock control signal. When resetting, the reset handle outside the control box is reversely pulled, so that the blade shaft hook of the box is re-engaged with the movable iron core hook under the action of the small spring, the blade shaft is fixed in the valve fully closed state, and the micro switch is also restored to the original position. .
The main structural principle of the exhaust valve of the fire exhaust fan is these. It is believed that as our technology continues to improve, its structural performance will be more perfect, and its application range will be more extensive.
Fire exhaust fan manufacturer performance requirements:
1. The motor uses a motor.
2. The fire exhaust fan should be able to operate normally for a long time under the condition that the medium temperature is not higher than 85 °C.
3. The fire exhaust fan should ensure that the working medium can work continuously for 30 minutes when the temperature of the medium is 280 °C, and it can continue to operate normally when the medium temperature is cooled to the ambient temperature.
4. At the rated speed, in the working area, the measured pressure curve of the ventilator and the curve given in the specification shall meet the following requirements:
a) The corresponding pressure value deviation is ±5% at the specified flow rate.
b) Under the specified flow rate, the corresponding pressure value difference is ± 5%.
4. The specific A-level noise limit under the given operating conditions in the description shall comply with the provisions of JB/T8690.