What is the reason for the pig house fan to be equipped with a bell mouth?

The reason is that the pig house fan horn can block airflow interference. The airflow from the pig house is fast, which pushes the airflow outside the fan housing to rotate the airflow. The rotating airflow will cause interference at the top of the blades, thereby reducing the diameter range of the airflow delivered by the fan blades, resulting in a reduction in air flow. A bell mouth is added to the fan to allow air to flow out directly along the bell mouth wall to prevent the outside air from blocking the airflow and ensure the stable output of the fan.

In addition, a bell-shaped design is used instead of a straight wall design to increase the air output. Air diffusion can reduce the back pressure on the fan blades and change the air flow.

At present, a large number of documents show that the horn with a slope of 7° has good performance. The greater the opening angle of the bell mouth, the airflow will separate from the bell mouth wall, forming turbulence. The standard length of the bell mouth is 1 to 1.5 times the diameter of the blade. Enhancing the bell mouth can change the performance of the pig house fan, but it will also make the pig house more susceptible to rain, snow or wind damage.

In a pig house with a positive pressure system, the benefits of adding a bell mouth to the fan are beyond doubt. Regardless of whether the pig house adopts a positive pressure system or a negative pressure system, adding a bell mouth to the fan can also increase the performance of the fan.

The working principle of the pig house fan is: when the water evaporates, it takes away the surrounding heat, thereby reducing the air temperature. The working principle of the fan is: the fan generates negative pressure through the curtain. At the same time, the water pump delivers the water to the pipe on the temperature curtain. The water evenly wets the contact surface of the wet curtain. The special angle of the wet curtain makes the water flow directly to the air inlet side. It can absorb a large amount of heat in the air, cool the air passing through the wet curtain, and be filtered, so that the air sent out becomes Cool, moist, and fresh, but the unevaporated water will flow back to the bottom to form a water cycle. When the water level drops to the set water level, the floating ball inlet valve opens automatically to replenish the water source. When the water level reaches a predetermined high, the floating ball inlet valve is automatically closed.