FBD Series Explosion-proof Press-in Counter-rotating Axial Flow Fan
- turboyun
- Shandong China
FBD series mine explosion-proof press-in counter-rotating axial flow local ventilator is a new type of local ventilator with a wide range of uses. The machine has the characteristics of compact structure, low noise, high wind pressure, high efficiency, good anti-wind performance, stable operation in small flow areas, and a wide range of high-efficiency applications. According to the length of the tunneling face and the different ventilation requirements of the roadway, it can be used as a whole machine or in grades, thereby reducing energy consumption and saving energy. It is an ideal equipment for local ventilation in long-distance mine tunneling.
1. Main purpose and scope of application
This series of fans are mainly used for local ventilation in underground coal mines with explosive gas environments, and also suitable for metal mines, chemical mines, tunnels and other places where ventilation is required.
2. Structural features and working principle
2.1 This series of fans is a combination of axial-flow local fans without vanes and an outsourcing compound muffler. The structure of the two-stage counter-rotating fan is shown in Figure 1. This series of fans consists of seven parts: collector, front muffler, cylinder, flameproof motor, first-stage impeller, second-stage impeller, and muffler diffuser. Composition; The structure of the three-stage counter-rotating fan is shown in Figure 2. This series of fans consists of a current collector, a front muffler, a cylinder, a flameproof motor, a first-stage impeller group, a second-stage impeller group, and a third-stage impeller group The structure of the four-stage counter-rotating fan is shown in Figure 3. This series of fans consists of a current collector, a front muffler, a cylinder, a flameproof motor, a first-stage impeller group, and a second-stage counter-rotating fan. The impeller group, the third-stage impeller group, the fourth-stage impeller group, and the muffler diffuser cylinder are composed of nine parts. Ventilators are generally designed for horizontal installation, with a service life of no less than 5 years, and a safe operation time of more than 13000h before the first overhaul.
2.2 Each stage of the FBD series counter-rotating local fan is driven by a flameproof motor with the same or different rated power. The impeller is directly mounted on the shaft extension of the motor, and the impellers between adjacent stages rotate in opposite directions. After the airflow enters the first-stage impeller to obtain energy, it is accelerated by the second-stage impeller and then accelerated by the third-stage impeller or the fourth-stage impeller to expel it. The latter stage impeller also has the function of the stationary blades in the ordinary axial flow fan. While obtaining the straightened circumferential speed component, it also increases the energy of the airflow, so as to achieve a higher wind pressure and pressure than the two-stage counter-rotating local fan. efficient. In order to avoid the superposition of the air flow pulsation between the stages of the counter-rotating partial fan, it is required that only one pair of blades in the front and rear stages can overlap each time during the rotation process, so the number of blades between adjacent stages is mutually prime. The aerodynamic performance of the machine meets the requirements of local quantitative ventilation in the mining face, long conveying distance, stable operation in small flow areas, wide application range in high-efficiency areas, and low noise.
