The ventilation fan by the motor drives the blade to rotate the air flow, making indoor and outdoor air exchange.
The purpose of ventilation is to remove the indoor dirty air, adjust the temperature, humidity and sensory effect. There are three ways of ventilation fan: discharge, suction and use. Window shutter type ventilation fan is the most widely used ventilation fan, to be composed of motor, fan blade, wind frame, panel, shutter and special cable switch and other auxiliary components. Motor-like using single phase capacitor operation asynchronous motor.
How the ventilation fan works
1. Basic principles
The exhaust fan is a kind of axial flow fan. Mainly used in negative pressure ventilation and cooling engineering and called industrial exhaust fan. The exhaust fan has the characteristics of super wind channel, super wind leaf diameter, super large exhaust volume, ultra-low energy consumption, low speed and low noise.
Using it together with the cooling water curtain can solve the problem of ventilation and cooling. The operation of the exhaust fan creates a negative pressure environment in the room. If the cooling water curtain is installed on the other side wall of the air outlet of the exhaust fan, while the indoor sultry air is discharged from the outdoor, the exhaust fan will also enter the indoor low temperature air containing rich water vapor through the cooling water curtain, so as to achieve the effect of ventilation and cooling.
2. Principle of ventilation
In the process of discharging the air from the exhaust fan, the indoor air pressure drops, and the indoor air becomes thin, forming a negative pressure area. The air flows into the room due to the air pressure difference compensation.
In the practical application of industrial plant, the exhaust fan is usually installed centrally in the plant side, the air inlet in the plant side side, the air from the air inlet to the exhaust fan to form a convective breeze. During this process, the door] window close to the exhaust fan remains closed, and the forced air flows into the workshop as compensated by the air intake-side doors and windows. Air lined up, orderly from the inlet into the workshop, flowing through the workshop, by the exhaust fan discharged from the workshop. Complete, effective ventilation, ventilation rate can be as high as 99%. Through the specific engineering design, according to the need of the design of ventilation speed and wind speed, any high heat, harmful gas, dust and smoke can be quickly discharged from the workshop, any poor ventilation problems can be completely solved once-secondary. The ventilation effect can be achieved within a few seconds of opening the fan.
3. Principle of cooling
The exhaust fan can quickly discharge the hot indoor air, and inhale the air on the other side of the outdoor into the room, reaching the same temperature as the outside temperature, without increasing the temperature in the workshop. The process of air flow will take away human heat, air flow accelerates the evaporation of sweat and absorb human heat, so that the human body feels cool, to reach as cool as the natural wind.
