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Where to pay attention to exhaust fan selection

A kind of mechanical which can increase gas pressure and send gas by means of input mechanical energy is widely used in ventilation, dust discharge and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air in boilers and industrial furnaces.

  

Cooling and ventilation in air conditioning equipment and household electrical appliances; drying and picking of grains; wind tunnels and inflating and propulsion of hovercraft. According to the direction of gas flow, fans can be divided into centrifugal, axial flow, diagonal flow (mixed flow) and cross flow.

  

First, purchase aspects

  

When choosing a fan, consumers should choose products that have a brand of fan manufacturers, for two reasons: first, the product quality of the fan is guaranteed; two, although the price may be relatively high, the energy efficiency of the blower of the brand enterprise is good, and its use cost is much lower.

  

Two, the use of

  

1, only in Smoke exhausting fan for fire fighting Under normal circumstances, it can be operated. At the same time, voltage stability must be ensured and no phase running is strictly prohibited. The power supply lines must be private lines, and the temporary lines should not be used for long time.

  

2, the use of the environment should be kept clean and tidy, keep the surface of the fan clean, there should be no sundries in the inlet and outlet. Regularly eliminate dust and other debris in fans and pipes.

  

3, fans should be stored in a dry environment to avoid motor dampness. When the fan is stored in the open air, rain protection measures should be taken. During storage and handling, the blower should be prevented from bumping, so as not to damage the fan.

  

4. During the operation of the fan, there are abnormal sound, serious motor heating, shell electrification, switch tripping and inability to start. In order to ensure safety, it is not allowed to carry out maintenance in the operation of fans. After maintenance, it should be tested for about 5 minutes, and no abnormal phenomena should be identified before starting operation.

  

The advantage is direct and reliable linkage. The disadvantage is that the linkage lines are more, easy to omit, and difficult to construct. This method is suitable for small simple projects, especially for projects with fewer smoke exhaust valves and no automatic fire alarm system. This method is not suitable for large and medium complex projects.

  

The fire valve is linked by the automatic fire alarm system linkage module and the smoke exhaust fan. The fire valve is linked by the automatic fire alarm system linkage module and the smoke exhaust fan. The method is suitable for large and medium-sized projects, and the number of smoke exhaust valves is large. The smoke valve is connected with the fire alarm system through the monitoring module (set the address for the exhaust valve) and the linkage module.

  

When the smoke detector is on the alert, the host receives the alarm signal and carries out logical judgement. It provides 24V active contact to the exhaust fan control box. The intermediate relay KA1 is charged 13 KA1, the 14 is closed to KA6 the coil is electrified, the KA6 contact is closed, and the SAC is in an automatic state to enable the fan to be opened. At the same time, the fire engine sends out the control instruction to open the exhaust valve. Similarly, the fan and exhaust valve are closed, and the fire alarm is issued after the logical judgement of the fire engine.



Tags:   Smoke exhausting fan for fire fighting   Axial fan   Centrifugal fan
Clicks: Update time: 2018-10-10 21:06:34 [ Print this page [ Close ]
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