cross-flow fanIt is a common ventilation equipment, which is mainly used in industrial, construction and civil fields.cross-flow fanIt is characterized by small size, low noise, large air volume, high air pressure, and convenient installation. So,cross-flow fanWhat is the design principle of? Let's take a closer look.

1. Basic structure

　　cross-flow fanIt is composed of shell, impeller, motor and controller. Among them, the impeller is the core component of the cross-flow fan, which uses multiple blades to rotate around the periphery of the motor rotor to generate airflow. The shell plays the role of collecting air, guiding wind and protecting the impeller.

2. Principles of Aerodynamics

The aerodynamic design of cross-flow fans is based on Bernoulli's law and its corollary. According to this law, when the air flow through the impeller, will produce negative pressure zone and positive pressure zone. In the negative pressure zone, the airflow velocity increases and the air pressure decreases; in the positive pressure zone, the airflow velocity slows down and the air pressure increases. This change in airflow creates a backward thrust that pushes the impeller to rotate.

3. Impeller design

　　cross-flow fanThe impeller design is also a very critical part. Excellent impeller design can effectively improve the efficiency and performance of cross-flow fans. In impeller design, the following factors need to be considered:

(1) Blade shape

Blade shape is one of the important factors that determine the efficiency and performance of cross-flow fans. According to aerodynamic principles, the blades should be as slender, smooth and symmetrical as possible to achieve good airflow control.

(2) Number of blades

The number of blades is also one of the important factors affecting the efficiency and performance of cross-flow fans. Generally, the more the number of blades, the greater the air volume and wind pressure, but it also increases noise and power consumption.

(3) Blade pitch

Blade pitch is also one of the important factors affecting the efficiency and performance of cross-flow fans. A reasonable blade inclination angle can make the airflow pass through the impeller smoothly, while ensuring the air volume and pressure, while reducing noise and power consumption.

4. System Analysis and Optimization

In addition to the impeller design,cross-flow fansystem analysis and optimization is also a very important part. In system analysis and optimization, multiple factors such as airflow, motor power, motor efficiency, and noise need to be considered. Through scientific and reasonable analysis and optimization, the efficiency and performance of the cross-flow fan can be improved to meet the requirements of users in different fields for air volume, wind pressure, noise and so on.

In summary, the design principles of the cross-flow fan include aerodynamic principles and impeller design principles. In practical applications, according to the actual needs, from the impeller shape, the number of blades, blade angle and other aspects of excellent design