What is the working principle of a negative pressure fan? What are the ways of ventilation control?

Update:24-09-2019
Summary:

The powerful function of the negative pressure fan must […]

The powerful function of the negative pressure fan must be clear to many people, but what is the working principle of the negative pressure fan? What are the ways of ventilation control? Let's take a look!
The working principle of the negative pressure fan:
Negative pressure is the process of convection of air in the workshop, but what is needed is a process of energy conversion. The negative pressure type horn fan is converted into kinetic energy by the electric energy. The wind can discharge the indoor air to the outside to reduce the indoor pressure. Under the action of the atmospheric pressure, the outdoor fresh air is filled in and produced from the opposite window and the door of the negative pressure type fan. Negative air convection.
Bad sources of work environment - sun exposure, mechanical heat source, plant structure, odor in the intensive production process of cheese, soot. The negative pressure horn fan can quickly discharge indoor air out of the room to create a fresh and natural working environment.
Negative pressure fan ventilation control method:
1, local exhaust ventilation
Where the pollutants are concentrated and diverged; the diverging state is characterized by a low aerodynamic state, or the pollutants are dust, aversion, etc., and need to be pumped at a flow rate of 8 meters per minute. The negative pressure fan is suitable for use in such ventilation control. Method. With this control method, a small negative pressure fan or an axial fan is required to quickly discharge it.
2, comprehensive dilution ventilation
Fully diluted ventilation requires several negative pressure fans or axial fans or circulating fans to continuously pump the outside clean air, continuously flushing the factory pollution, so that the air pollutants in the production process will volatilize and accumulate, so as not to reach dangerous ratio or safety level. Therefore, the control method of dilution ventilation is suitable for the occasion where the air pollutants in the factory are generally diverged rather than concentrated in several original points. It is also suitable for the occasion where the local divergence has escaped to the factory air. In fact, the effective ventilation control is to be localized. The combination of exhaust and full dilution of the two ventilation methods, not only have the advantages of both, but also economically more reasonable design, because in many workplaces, there may be both comprehensive pollution divergence and local pollution divergence, With joint control, the pollutants from the local exhaust gas have been removed from the starting point of the divergence, and the air volume required for ventilation is fully diluted, so that the negative pressure fan can be greatly reduced, and the equipment and manpower consumption It is a great interest.

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