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According to the direction of gas flow, fans can be divided into centrifugal, axial, diagonal and cross flow types.
When the centrifugal fan is working, which one is the best , the power machine (mainly the motor) drives the impeller to rotate in the volute casing, and the air is sucked in from the center of the impeller through the suction port. Due to the dynamic effect of the blades on the gas, the pressure and speed of the gas are increased, and the centrifugal force is thrown along the blade path toward the casing and discharged from the exhaust port. Because the flow of gas in the impeller is mainly in the radial plane, it is also called a radial flow fan.
The centrifugal fan is mainly composed of an impeller and a casing. The impeller of a small fan is directly mounted on the motor. The large fan is connected to the motor through a coupling or a pulley. Centrifugal fans are generally single-sided air intake, using single-stage impellers; large flow can be double-sided air intake, using two back-to-back impellers, also known as double-suction centrifugal fans.
The impeller is the main component of the fan. Its geometry, size, number of blades and manufacturing accuracy have a great impact on performance. The impeller must be corrected by static balance or dynamic balance to ensure the fan to rotate smoothly. According to the direction of the blade exit, the impeller is divided into three types: forward, radial and backward. The top of the blade of the forward impeller is inclined toward the direction of rotation of the impeller; the top of the blade of the radial impeller is radial, and it is divided into straight and curved blades; the top of the blade of the backward impeller is inclined in the reverse direction of the impeller rotation.
The pressure generated by the forward impeller is strong. When the flow rate and the number of revolutions are constant, the required impeller diameter is small, but the efficiency is generally low. The backward impeller, on the other hand, generates a weak pressure, which requires a large impeller diameter and high efficiency ; The radial impeller is somewhere in between. The straightest blade is the simplest type of blade, and the most complicated is the airfoil blade.
In order to make the blade surface have a proper speed distribution, curved blades are generally used, such as circular blades of equal thickness. The impeller usually has a cover disc to increase the strength of the impeller and reduce gas leakage between the blade and the casing. The blade and cover plate are connected by welding or riveting. The weight of the welding impeller is light and the runner is smooth. The impellers of low and medium pressure small centrifugal fans are also cast with aluminum alloy.
When the axial flow fan is working, the power machine drives the impeller to rotate in the cylindrical casing, and the gas enters from the current collector, obtains energy through the impeller, increases pressure and speed, and then discharges in the axial direction. There are three types of axial flow fans: vertical, horizontal and inclined. The diameter of the small impeller is only about 100 mm, and the large one can be more than 20 meters.
Small low-pressure axial-flow fans are composed of impellers, casings, and current collectors, and are usually installed on the walls or ceilings of buildings; large high-pressure axial-flow fans are composed of current collectors, impellers, streamlines, casings, and diffusers And transmission components. The blades are evenly arranged on the hub, and the number is generally 2-24. The more blades, the higher the wind pressure; the blade installation angle is generally 10 ° -45 °. The larger the installation angle, the larger the air volume and wind pressure. The main parts of the axial flow fan are mostly welded or riveted with steel plates.
An oblique flow fan is also called a mixed flow fan. In this type of fan, the fan manufacturer, the gas enters the impeller in a direction at an angle to the axis, obtains energy in the impeller, and flows out in an oblique direction. The shape of the impeller and casing of the fan is conical. This fan has both centrifugal and axial flow characteristics, and the flow range and efficiency are in between.
Cross-flow fans are small high-pressure centrifugal fans with forward multi-blade impellers. The gas enters the impeller from one side of the outer edge of the rotor, and then exits from the other side through the interior of the impeller. The gas is subjected to the force of the blade twice in the impeller. Under the same performance conditions, it is small in size and low in speed.
Compared with other types of low-speed fans, cross-flow fans have higher efficiency. Its axial width can be arbitrarily selected without affecting the flow state of the gas, and the gas still maintains a uniform flow over the entire width of the rotor. Its exit section is narrow and long, suitable for installation in various flat-shaped equipment for cooling or ventilation.
Development trends of small and medium-sized centrifugal and axial flow fans:
As the competition in the wind turbine manufacturing industry continues to intensify, mergers and acquisitions and capital operations between large wind turbine manufacturers are becoming more frequent. Domestic good wind turbine manufacturers pay more and more attention to the research of the industry market, especially to the industrial development environment and product buyers. In-depth research. Because of this, a large number of well-known domestic fan brands have risen rapidly and gradually become the leader in the fan manufacturing industry!
From the characteristics of fan demand, for large and small-sized fans, the product structure and manufacturing process are relatively simple, and the cost is low. The users are mainly pursuing high efficiency, low noise, long life, fans, and cheap. The other is capital and technology-intensive, the product structure is complex, the manufacturing cycle is long, the set and system are also strong, and it operates under high pressure, high temperature and high speed conditions, and some even run under harsh conditions. Different types of fans have different requirements. For turbine blowers and compressors and large fans, users are mainly pursuing high quality, high reliability, stable operation and long cycles.
Tianjin Fan Price | Ventilator | Jin Blower is provided by Jin Blower Group Co., Ltd. Tianjin Blower Group Co., Ltd. (fuzzlinks.com) has strong strength and reliable reputation, and has accumulated a large number of loyal customers in the fan and exhaust equipment industries in Tianjin and Tianjin. The company's continuous improvement of work attitude and continuous improvement of innovative ideas will lead Jin Blower and you to enter a brilliant future together for a better future!
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