Pumps, fans, compressors,

hydroturbine

All belong to

fluid machinery

The so-called fluid machinery refers to the fluid as.

Use medium

A machine that converts energy, that is, the conversion between the mechanical energy of a fluid and the work done by the machine.

energy transformation

Machine.

Fan is a kind of fluid machinery that converts the work done by the prime mover into the pressure potential energy and kinetic energy of the transported fluid, and the one that transports the liquid is called pump; Lucky fans.

Generally speaking, a fan has two or more blades.

rotation axis

The machinery that pushes the air flow, the blades convert the rotating mechanical energy acting on the shaft into the pressure increase to push the air flow, which is accompanied by the movement of the fluid.

The purpose of the fan

The use of fans can be roughly divided into two categories: civil and industrial:

civil

ventilating device

Used for internal and external ventilation of civil public buildings. Fresh air (air supply fan) is sent into the building, or dirty old air in the building is discharged to the outside. At the same time, an independent preset air inlet is responsible for supplementing fresh air (exhaust fan). For example, venues, cinemas, commercial buildings, culverts, tunnels and other occasions need ventilation.

Auxiliary function

At present, this function is realized by fans;

Ordinary smoke exhaust

Used to remove the fumes from public dining places (

draft fan

), for example, Infineon CUS series fans used by McDonald's are typical cases of such fans;

Fire smoke exhaust

It is mainly used to clear the high-temperature smoke and dust in buildings in case of fire, reduce the concentration of high-temperature smoke and dust to improve the visual field in buildings, and win and prolong the safe escape time of people at fire sites.

forced ventilation

When an accident happens, supplying gas to the escape corridor is beneficial to escape. At the same time, the air pressure in the corridor is positive, which means that the air pressure in the corridor is higher than that in other places, and there will be no smoke infiltration to cause suffocation and ensure safety.

It was found that many trapped people died in the early stage of the fire, not because of burning, but mainly because a large number of high-temperature smoke with high concentration and low oxygen content suffocated in the early stage of the fire, which blocked people's sight and further reduced the possibility of escape. It is also found that when a fire breaks out in a building, it takes about 20-30 minutes for the overall internal environment to reach the limit temperature and anoxic state that people can bear, and the high-temperature airflow is mainly concentrated in the upper part of the internal space of the building. Therefore,

formulate

Fire fighting fan

According to the basic performance requirements and certification implementation standards, the certification standard of fire fighting fans in China is that the fans should run normally at 280℃ for at least 30 minutes.

Industrial use

Workshop ventilation

various

industrial factory building

In general, the fan is installed on the roof, window or side wall, and there are two ways to achieve ventilation effect: air supply and air exhaust.

Air cooling and cooling

Provide suitable airflow for some long-term heating equipment to achieve the purpose of cooling the equipment. For example, the fan (micro fan) on the computer CPU and the fan assembled at the back of the motor are air-cooled to cool the equipment;

Heating and drying

By blowing fresh air at a certain temperature, the dehydration process of equipment, finished products or semi-finished products is accelerated. For example, a large number of fans may be used in the drying process of industrial spraying workshops, food, pharmaceutical, paper and other production lines;

pneumatic conveying

Low-quality media (gas, solid, liquid and mixed) are transported to the destination through the pipeline by the operation of the fan (which can be understood as blowing and belt blowing), which is actually the next process in the industrial process. take for example

Washing powder production line

、

Blow molding

Process flow line;

Gas supply and combustion support

Transporting a large amount of fresh air with oxygen at high pressure requires high-temperature combustion containers such as high-temperature furnaces and converters to burn fully.

heat value

So as to achieve industrial purposes. Such as steelmaking blast furnaces, sintering processes, cement manufacturing processes and

polysilicon

This kind of fan will be used in the processing.

Equipment matching

Nested installation in other industrial equipment becomes one of the accessories of these equipment. In this device, the fan can play one or more of the above functions. For example, the cooling fans installed at the rear of the motor are complete sets, and the fans assembled on the car when the car leaves the factory are complete sets for consumers.