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I. Characteristics and Applications of 4-68 Type Centrifugal Fan – Dust Collection Exhaust Fan
4-68 Centrifugal fan is a mechanical device that uses the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machinery.
4-68 Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and conveying of grains; air source for wind tunnels and inflation and propulsion of air cushion ships, etc. It transports air and other gases that are not natural and harmful to the human body, and do not corrode steel materials. The gas contains no viscous substances, and the dust and hard particles do not exceed 150mg/m3, and the gas temperature shall not exceed 80℃.
For the transportation of corrosive gases at a certain concentration, glass fiber reinforced plastic materials or stainless steel materials can be used to manufacture anti-corrosion fans.
For the transportation of flammable and explosive gases, a cast aluminum impeller and an explosion-proof motor are used, and an explosion-proof fan can be manufactured.
For gas transportation angles greater than 80° and less than 250°, a water transmission bearing seat can be used, with ordinary steel plate material. For gas transportation angles greater than 250°, it is recommended to use stainless steel material.
The 4-68 type centrifugal fan and dust removal exhaust fan will experience certain changes in pressure as the temperature of the conveyed gas increases. The power of the motor used will also be adjusted accordingly. For detailed information, please contact the manufacturer.
II. Working Principle of 4-68 Centrifugal Fan – Dust Collection Exhaust Fan
The 4-68 centrifugal fan operates based on the principle of converting kinetic energy into potential energy. It uses a high-speed rotating impeller to accelerate the gas, then decelerates and changes the direction of flow, converting kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller axially, changes direction to radial when passing through the impeller, and then enters the diffuser. In the diffuser, the gas changes its flow direction and the cross-sectional area of the pipe increases, causing the gas flow to decelerate. This deceleration effect converts kinetic energy into pressure energy. The pressure change mainly occurs in the impeller, followed by the diffuser process. In a multi-stage centrifugal fan, a returner is used to make the gas enter the next impeller, generating higher pressure [1].
III. Model 4-68 Centrifugal Fan – Dust Collection Exhaust Fan Type
The centrifugal fans can be manufactured in two types: right-hand and left-hand. When the motor is viewed from the front, the outlet is clockwise for the right-hand type and counterclockwise for the left-hand type. The transmission method of the fans is in four types: A, B, C, and D. Fans below No. 5 are mostly of type A, those from No. 6.3 to No. 12.5 are of type C or D, and those above No. 16 are of type B.
A: Direct connection type of motor
B/C: Belt-driven type
D: Elastic coupling transmission type
IV. Structure of the 4-68 Centrifugal Fan – Dust Collection Exhaust Fan
1. Impeller: It is composed of a backward-inclined airfoil blade, a curved front disk and a flat rear disk. All of them are made of steel plates and have undergone static and dynamic balance adjustments. The air performance is excellent, the efficiency is high, and the operation is stable and reliable. The backward-inclined impeller makes the performance curve of the fan more flat, and it is less likely to overload with a large flow.
2. Shell: It is made by welding carbon steel. It can be produced in two different types. For those with a diameter of 12.5# or less, it is made as a single piece; for those with a diameter of 16# or more, it is made as a split type and connected by bolts.
3. Inlet: It is designed as a convergent streamlined overall structure. It is installed on the side of the fan and the cross-section along the axial direction is in a curved shape, which enables the gas to smoothly enter the impeller with minimal loss.
4. Transmission System: The transmission part consists of the main shaft, bearing housing, rolling bearings, pulleys or coupling assemblies. (When the gas temperature exceeds 80 degrees Celsius, water-cooled transmission is adopted to reduce the working temperature of the bearing chamber and extend the service life.)
V. Common types of centrifugal fans are as follows:
1. Industrial centrifugal fan
2. Dust removal / environmental protection fan
3. Corrosion-resistant / explosion-proof fan
4. High-temperature boiler exhaust fan
Zibo Hongcheng Fan Co., Ltd. is located in Zhoucun District, Zibo City. It is adjacent to Binbo Expressway and Jiaozi Railway in the east, Jiqing Expressway in the north, 309 National Highway in the south, and is only 60 kilometers away from Jinan International Airport in the west. The transportation is very convenient.
The company currently has over 50 series and 600 different specifications and models of wind turbines. They are widely used in industries such as mining, coal mines, oil fields, chemical plants, kilns, metallurgy, boilers, textiles, building materials, etc., and have received unanimous praise from all these industries.
