Commonly used fan fans, in terms of its construction, there are two types of centrifugal and axial flow. The centrifugal fan is shown in Figure 1. When the working wheel rotates inside the spiral casing, due to the centrifugal force generated by the blade, a low pressure region appears in the central portion of the working wheel to draw in air; the rim portion generates a high pressure region to press air out of the diffuser. When the working wheel is continuously rotated by the motor, the air continuously enters from the suction port and is forced out from the diffuser through the working wheel. Figure 1 Schematic diagram of a centrifugal fan The axial flow fan is shown in Figure 2. When the working wheel rotates continuously, since the blade is in the shape of a wing and has a certain angle with the rotating surface (as shown in FIG. 3), a low pressure region is taken in the rear of the blade to take in air, and a high pressure region is generated in front of the blade to press air. This continues to create a romantic flow. In order to improve the efficiency of the fan, the streamline body is installed on the air inlet side of the working wheel to reduce the impact loss; the rectifier is installed on the air outlet side, which is a fixed working wheel for the purpose of overcoming the rotating wind flow discharged by the working wheel; The diffuser is then used to increase the static pressure. In order to increase the wind pressure of the fan, a set of working wheels and rectifiers can be added, which is called a secondary axial fan. The angle between the blade of the axial fan and the rotating surface is called the mounting angle. The mounting angle θ can be adjusted. As the installation angle increases, both wind pressure and air volume increase. The general installation angles are seven angles of 15°, 20°, 25°, 30°, 35°, 40°, and 45°. Figure 2 Schematic diagram of axial fan 1-working wheel; 2-blade; 3-shell; 4-collector; 5-rectifier; 6-streamline body; 7-diffuser Figure 3 Blade mounting angle of an axial fan Θ-blade mounting angle; t-blade spacing Fan fans used in mines can be divided into: fan fans for ventilation in the whole mine, called main fan fans, referred to as main fans; fan fans used to enhance ventilation in a certain area, called auxiliary fan fans, referred to as auxiliary fans; The fan fan used for the single-head working surface is called a local fan, which is referred to as a local fan. These fans have different characteristics depending on the requirements of use. Blow Moulding Machine,Stretch Blow Moulding Machine,Bottle Moulding Machine,PP Blow Molding Machine Demark(changxing)injection system CO. LTD , https://www.petplas.com