Under what circumstances fire dampers and smoke exhaust fire dampers are set up.
Fire damper and smoke fire damper in the practical application of the role of roughly the same, but there is a slight difference, so the fire damper and smoke fire damper settings need to be based on the surrounding environment.
In the ventilation, air conditioning system pipe set fire damper, in the exhaust system pipe set smoke fire damper, in order to prevent the fire when the high temperature toxic smoke transmission, cause the fire spread and increase the toxicity, in one of the following circumstances of ventilation, air conditioning system duct should be set fire damper:
(1) The pipeline crosses the partition wall of the fire compartment.
(2) The pipeline shall pass through the ventilation and air conditioning machine room and the partition wall and floor slab of the room with important or high fire risk.
(3) The horizontal pipe at the junction of the vertical air duct and the horizontal air duct of each layer.
(4) The pipeline crosses both sides of the deformation joint.

The case of setting smoke exhaust fire damper is: the separation of smoke exhaust system:
(1) In the population of the smoke exhaust room, set up a smoke exhaust fire damper that can be closed from the fire damper when the flue gas temperature exceeds 280 ℃. The smoke exhaust damper shall ensure that it can work continuously for 30min at 280 ℃.
(2) A smoke exhaust fire damper which can be closed by itself when the flue gas temperature exceeds 280 ℃ is set on the exhaust branch pipe.
The fire damper is closed. The main function is to prevent fire source and smoke from concatenating to other rooms through pipes after a room is on fire. The smoke exhaust fire damper is installed on the smoke exhaust pipe. The smoke exhaust fire damper is usually closed. After the room is on fire, the smoke exhaust fan is started. At the same time, the smoke exhaust fire damper is opened to exhaust smoke from the burning room so that personnel can escape in time without being harmed by smoke. When the fire is too large, flames will enter the smoke, at this time, the 280 ° fusible rod on the smoke exhaust fire damper is fused, the smoke exhaust fire damper is closed, and the signal is given to the smoke exhaust fan to close.
The function of (I) fire damper is a complex air supply and smoke exhaust system with complicated pipelines. In the air supply system, the air sent by the blower must be distributed to each branch pipe through the main pipe. In the exhaust or smoke exhaust system, the fire damper air or smoke is collected from each branch pipe into the main pipe and then enters the exhaust fan for discharge. Then, no matter in the air supply system or the smoke exhaust system, if there is no obstruction, the air supply volume and smoke exhaust volume cannot be controlled. There is a large amount of air supply and smoke exhaust in the parts that do not need air supply or smoke exhaust, while the parts that need air supply or smoke exhaust do not supply air, smoke exhaust or only a small amount of air supply and smoke exhaust. In order to cut off the pipelines that do not need air supply and smoke exhaust, this requires valve devices.
In addition, although the air volume of each part of the air supply and exhaust system is calculated through the pipeline and the corresponding pipeline design, on the one hand, there is a certain deviation between the theoretical calculation and the actual situation, on the other hand, the operating conditions of the system are constantly changing, so the air volume of each part of the system must be adjusted accordingly, which in turn requires valve devices.
In addition, some ventilation equipment, such as centrifugal fans, is preferably started at no load, because the starting current of the motor is the smallest, which is beneficial to safety. This requires cutting off the fire damper of the system pipeline before starting. When the inlet and outlet of the fan are equipped with switches, the inlet or outlet can be closed. If the inlet and outlet are not equipped with switches, they must be controlled by valve devices.
(II) smoke exhaust fire damper, the concept of fire damper fire damper refers to the valve installed in the air supply and return pipes of ventilation and air conditioning systems, which is usually open and automatically closed when the gas temperature in the pipe reaches 70oC during fire, which can meet the requirements of fire stability and fire integrity within a certain period of time and play the role of smoke isolation and fire prevention.
Smoke fire damper is installed in the smoke exhaust system pipe, usually open state, fire when the gas temperature in the pipe reaches 280oC automatically closed, in a certain period of time to meet the fire stability and fire integrity requirements, the role of smoke fire resistance valve.
(III) fire dampers and smoke exhaust fire dampers are arranged on the pipes of ventilation and air conditioning systems, and smoke exhaust fire dampers are arranged on the pipes of smoke exhaust systems to prevent the transmission of high-temperature toxic smoke during fire, which will cause the spread of fire and aggravation of toxicity.
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