In the ventilation and air conditioning system, a normally open electric fire damper is generally set in front of the fan. When the fire damper is fused and closed, the fan is jointly closed to prevent the fan from continuing to work after the air duct is closed, thus achieving the effect of protecting the fan. The subway ventilation and air conditioning system is relatively complicated, and the linkage functions of the normally open electric fire damper and the fan under different systems are different.
Definition of Normally Open Electric Fire Damper in Subway Engineering There are two types of normally open electric fire dampers in subway engineering: one is FF1 number, which is normally open, electrically operated, electrically or manually reset, 70°C fuse closed fire dampers for air supply and exhaust pipelines, and the other is FP1 number, which is normally open, electrically operated, electrically or manually reset, fire dampers 280°C fuse closed fire dampers for smoke exhaust pipes or exhaust and smoke exhaust pipes.
The difference between the two fire dampers lies in the different fusing temperatures of the fuses. The operating principle of the normally open electric fire dampers in subway engineering There are three condition output terminals of the normally open electric fire dampers: the on condition signal (A), the off condition signal (C) and the common terminal (B). In normal condition, the fire dampers insist on the open condition, and the common terminal (B) is connected with the on condition signal output terminal (A), the control system discriminates that the fire damper is open.
When a fire occurs, the smoke (temperature) sensing probe announces a fire signal, the control system outputs DC24V power to the fire damper control arrangement electromagnet, the electromagnet is energized, the hook on the operation arrangement is disconnected from the pawl through the connecting piece, and the pawl is fixed with the blade shaft. At this time, the blade is activated and closed under the effect of the spring force of the valve body. When the airflow temperature in the pipeline reaches the fusing temperature of the fuse, the fuse, the fuse will fuse, the fusible rod is opened under the effect of the compression spring, and the tension spring I loses the tension.
Under the effect of spring II, the hook and pawl are disconnected, the blade is closed, the fire damper is electrically or fused closed, the pressing piece on the main shaft rolls 90 degrees, the micro switch is released, the A- B circuit is blocked, and the electromagnet DT is powered off. At this time, the micro switch is B- C turned on and the valve closing signal is output, because the electric closing signal of the valve and the fusing closing signal are output through the same group of terminals, it is necessary for the control system to distinguish the fuse closure signal of the fire damper through logic programming.
With everyone in-depth understanding of the work of electric smoke fire damper.
The electric smoke exhaust fire damper is mainly used in the mechanical smoke exhaust system. It is a 280 ℃ fire damper. When the flat fire damper is normally closed, it is automatically opened by the automatic fire alarm linkage signal when a fire occurs. At the same time, it has a manual actuator, which can be manually opened or remotely opened in the fire control center (I .e. linkage control, manual control and automatic control). It is generally installed at the smoke exhaust port and the air duct crosses for fire prevention, the partition of the smoke prevention zone and the air duct of the smoke exhaust room shall be closed when the temperature of the smoke in the air duct reaches 280 degrees.
The electric smoke exhaust fire damper is normally closed, and the smoke in the room will automatically open when it reaches a certain concentration, and then automatically close at 280 degrees Celsius.

The advantages of electric fire valve:
1. The fire damper has low air leakage and good air tightness.
2. The electric opening consumes a small current.
3. Strong anti-corrosion performance and long service life.
4, the actuator drive flexible, feedback, interlock signal accurate.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures