The setting and selection of fire prevention valves in ventilation and air -conditioning system
1. The GB50045-95 (2001 edition) and "Fire Fire Specification of Building Design" GBJ16-87 (2001 Edition) have requirements for the setting of fire valves. To sum up, there are the following:
(1) The air duct crosses the fire zone;
(2) Crossing ventilation, air -conditioning machine rooms and important or high -fire room partition walls and flooring;
(3) The fire prevention valve should be provided on the horizontal pipe section of the vertical air duct and the horizontal duct of each layer, but when the ventilation and air -conditioning systems of the multi -layer building are independently set up, the horizontal wind wind in the fire prevention partition will beThere is no fire prevention valve at the junction between the tube and the vertical manager;
(4) There is one on the air ducts on both sides of the deformation seam.
The fire valve of the above -mentioned parts is usually opened. When the temperature reaches 70 ° C in the fire, it is automatically closed.The firewood valve should be set up close to the fire -resistant separation, and branches and suspension should be set up separately.When the fire prevention valve is dark, the maintenance port should be set at the installation site.
2. The vertical exhaust pipelines of the kitchen, bathroom, toilet, etc. When there are no measures to prevent return, the fire valve must be set on the branch pipe.Public building kitchen, due to the high temperature of the oil fume, in order to prevent the fire prevention valve from incorrecting, at the junction of the fuel exhaust pipe and the vertical air duct, a fired fire valve should be set at 150 ° C.
3. The setting of fire valve in the design of air conditioning concentration fresh air system design
The form of a new air system usually has a hierarchical setting level new air system and vertical fresh air system.
(1) Layered the horizontal fresh air system
The fresh air system is set according to the floor.There are two types of fresh air inhalation. One is that the new air is absorbed outdoors by opening the cave from the exterior wall; the other is to set up a total new air vertical channel, and the fresh air units on each layer take the wind from the vertical channel.The previous way to take the new air does not need to set fire prevention valves at the entrance of the fresh air unit. The latter is concentrated in the new air. For high -rise buildings, the total new wind and vertical wind channel must cross the fire prevention partition.70 ° C fractive valve.
(2) Vertical fresh air system
The vertical fresh air system is that the outdoor air is processed by the fresh air unit, and it is sent to the air -conditioned room through the vertical channel. Generally, the fresh air unit is located on the roof.It is more applicable to the high height of the building and the difficulty of laying a new air duct.For high -rise buildings, the vertical wind channel should cross the fire prevention partition, and the airport is required to set the fire valve with a 70 ° C fuse.
4. The vertical and air -conditioning system should be set according to each fire prevention partition, and the vertical layout should not exceed 5 floors; when the pipeline is equipped with a reflux facility or a fire prevention valve, and the automatic water spray fire extinguishing system is provided with each layer, its vertical vertical vertical system is provided.The number of layers to the connection is not limited by this.
5. When there is a air volume adjustment requirements for the location of the firewood valve, a fire prevention valve can be set.
The setting and selection of fire prevention valves in the smoke -proof system
1. On the entrance of the smoke exhaust fan, the smoke exhaust fire prevention valve that can be automatically closed when the temperature of the flue gas exceeds 280 ° C, and it should be chased with the smoke exhaust fan. When the smoke exhaust fire valve is closed, the fan stops operation.The smoke exhaust fan should ensure that it can work continuously for 30 minutes at 280 ° C.It should be noted that the smoke discharge fire prevention valve is set in front of and after the smoke exhaust fan, and it must be flexibly determined according to the specific situation.Take the basement smoke exhaust system as an example:
(1) When the basement is only one floor, and when the smoke is exhausted by the vertical wind duct, the smoke and fire prevention valve should be set on the head of the smoke exhaust fan entrance;
(2) The number of local underground rooms is above the second and second floors. When a row of tobacco vertical wells on each layer, the fire and fire valve of each layer shall be set on the general manager of the smoke exhaust fan export, that is, the setting on one side of the smoke is set.Essence
2. Regardless of whether it is a vertical furnishing smoke exhaust system or a horizontal -like room smoke exhaust system, the fire -exhaust fire prevention valve that can be automatically closed when 280 ° C is set at 280 ° C.
3. The mechanical smoke exhaust system should be set up in the horizontal direction according to the fire prevention partition. Each horizontal air duct should not cross the fireproof partition, but the area of ??certain floors of some projects is large. It is difficult to set up the smoke drainage system according to the fireproof partition.Smoking fire prevention valves that can be automatically closed when crossing at 280 ° C.
(1) When the ingredients are set up, the smoke discharge fire prevention valve is provided on the smoke exhaust support;
(2) When a normal open air outlet is set up, the smoke discharge support valve is provided on the smoke tube;
(3) When there is a special fire -resistant fire exhaust port, there is no smoke exhaust fire prevention valve on the smoke discharge support.
4. The basement of the mechanical smoke should be considered. When the mechanical inlet system is used, a 70 ° C fractive valve should be set on the fan entrance pipe.
5. For the pressure supply system, the fire valve of 70 ° C melting can be set on the pipeline of the pressure supply dealer to prevent the fresh air entrance from being threatened by fire and smoke, and the flue gas is transported to the floor.
The above is the introduction of how reasonably used the fire prevention valve in the design engineering. If you want to understand and learn more about related knowledge, please pay more attention to us ——