月度归档：9 月 2024

Centrifugal fan vs axial fan

• ‌The main differences between centrifugal fans and axial fans are their working principles, air flow direction, efficiency and performance, noise and vibration, structure and maintenance, and application fields. ‌
• Working principles are different‌:
• The centrifugal fan generates centrifugal force through the high-speed rotation of the impeller, projects the gas outward from the center, and then discharges it through the volute tube, thereby increasing the pressure and changing the flow rate of the gas.
• Axial flow fans rely on the forward power generated by the rotation of airfoil blades to inhale and discharge air along the axial direction.
• Airflow directions are different‌:
• The gas flow direction of centrifugal fans is away from the center of the impeller, and usually exhibits the characteristics of high pressure and low flow rate.
• The gas flow direction of the axial flow fan is within the impeller axis line, usually showing the characteristics of low pressure and high flow rate.
• Efficiency is different from performance‌:
• Centrifugal fans have higher efficiency and can produce larger air volume and higher wind pressure. They are suitable for application scenarios that require large flow and high wind pressure.
• The efficiency of axial flow fans is relatively low and is suitable for environments that require smaller air volumes but pay more attention to static pressure.
• Noise is different from vibration‌:
• Centrifugal fans are generally noisier than axial fans because their blades produce higher levels of noise.
• Axial flow fans are relatively quiet and suitable for environments where low noise is required.
• Structure and maintenance are different‌:
• The structure of centrifugal fans is usually complex and difficult to maintain and repair. Moreover, the impeller and casing are usually designed as a whole. Once damaged, they need to be replaced as a whole.
• The structure of the axial flow fan is relatively simple and easier to maintain and repair.
• Different application fields‌:
• Centrifugal fans are widely used in applications requiring large flow and high wind pressure, such as ventilation and air conditioning systems.
• Axial flow fans are more commonly used in environments that require smaller air volumes but pay more attention to static pressure, such as offices, shops, etc.‌.

centrifugal fan vs axial fan

centrifugal fan working principle

• The working principle of a centrifugal fan is to use a high-speed rotating impeller to accelerate the gas, and then convert the kinetic energy into potential energy (pressure) by decelerating and changing the flow direction. ‌‌
• The centrifugal fan is mainly composed of air inlet, impeller, deflector, casing and motor. When working, the motor drives the impeller to rotate at a high speed, and the gas from the air inlet is sucked into the impeller. After the impeller accelerates the gas, it is discharged through the deflector and casing. The working principle of the centrifugal fan is based on the action of centrifugal force. When the impeller rotates at high speed, the gas is accelerated to the action of centrifugal force, resulting in a pressure difference. The pressure of the gas at the air inlet is low, while the pressure of the gas at the air outlet is high. Therefore, the gas will flow from the air inlet to the air outlet along the pressure gradient.

centrifugal fan vs axial fan

Which is better axial fan or centrifugal fan?

• ‌Axis fans and centrifugal fans each have their own advantages and disadvantages and are suitable for different occasions. ‌When choosing, comprehensive considerations should be made based on actual needs and budget.
• Axial fans and centrifugal fans work on different principles. Axial fans rotate axially and use the centrifugal force of the impeller to accelerate the gas, thereby increasing the pressure of the gas. The centrifugal fan accelerates the flow of air or other gases through centrifugal rotation, thereby converting kinetic energy into static pressure and blowing the gas to the designated position.
• In terms of applicable occasions, centrifugal fans are suitable for occasions that require larger air volume and higher pressure, such as ventilation in large factories, warehouses, sports venues and other places. Axial flow fans are suitable for occasions that require smaller air volume and higher speed, such as local ventilation in computer rooms, laboratories, production workshops and other places.
• In terms of performance characteristics, centrifugal fans have large air volume and high pressure, but they are noisy, more expensive, and have a longer service life. Axial flow fans have small air volume, moderate pressure, relatively low price, and simple installation and maintenance.
• In terms of efficiency, centrifugal fans perform better in higher pressure ranges, especially when dealing with high-concentration exhaust gases, and can more effectively reduce energy consumption and emissions. Axial flow fans have high efficiency under large flow and low pressure conditions, and are suitable for ventilation and heat dissipation and other occasions that require high air volume but relatively low pressure requirements.
• In terms of cost-effectiveness, the cost of centrifugal fans is relatively high, but after long-term operation, due to their stable performance and high efficiency, they can save a lot of energy and operating costs. Axial flow fans can also meet the needs in some situations, are low-cost, and are suitable for short-term use or local ventilation.

centrifugal fan vs axial fan

Why use a centrifugal fan?

• ‌Centrifugal fans are widely used in many fields, including construction, industrial production, environmental management and air conditioning systems. ‌
• First of all, ‌in the construction industry‌, centrifugal fans are used for ventilation and air circulation, improving air quality and providing a good and comfortable working and living environment. For example, in large shopping malls, convention and exhibition centers, office buildings and other places, centrifugal fans provide fresh air by discharging dirty air to maintain indoor air quality and comfort.
• Secondly, in the industrial field, centrifugal fans are widely used in factories, workshops and other places to eliminate toxic and harmful gases, control temperature, eliminate dust and odors, etc., and create a good working environment for employees. For example, in chemical, mining, electric power and other industries, centrifugal fans are often used to transport gases, discharge waste gases, etc., to improve production efficiency and reduce energy consumption.
• In addition, in the air conditioning system, centrifugal fans are an important part of the air conditioning system and are used for air circulation, pressurization, exhaust, etc. to ensure the circulation and cleanliness of indoor air. Provide comfortable temperature and humidity indoors through air supply, return air, exhaust, etc.
• Finally, in terms of environmental management, centrifugal fans are used in facilities such as urban sewage treatment plants to send gas to subsequent treatment equipment for processing, purify the air, and reduce environmental pollution. For example, in environmental protection facilities such as exhaust gas treatment, smoke purification, and gas adsorption, centrifugal fans can effectively extract and discharge harmful gases and particulate matter from the atmosphere.

centrifugal fan vs axial fan

Are centrifugal or axial fans quieter?

• Axial fans are generally quieter than centrifugal fans.
• When an axial flow fan is working, the blades push the air to flow in the same direction as the axis. This structure makes the air volume larger, but it also means that the noise is relatively small.
• The reason why axial flow fans make less noise is that the airflow direction is parallel to the axis. This design makes the airflow smoother and reduces the generation of turbulence and noise. In addition, axial fans are usually used in systems with low static pressure that require higher airflow levels, which also gives them certain advantages in noise control.
• In contrast, when a centrifugal fan is working, the gas flow direction is perpendicular to the rotating axis. Although this design provides greater wind pressure, it also brings greater noise. Although centrifugal fans can provide stable air supply in high-pressure systems, their structure and working method result in relatively loud noise.
• To sum up, axial fans are generally quieter than centrifugal fans due to their design where the airflow direction is parallel to the axis.

centrifugal fan application / centrifugal fan working principle

• Centrifugal blower is a commonly used fan equipment. Its main purpose is to transport, circulate, pressurize or discharge air, gas or dust and other substances. It is widely used in industry, construction, metallurgy, chemical industry, electric power, environmental protection and other fields. The following are the main uses of centrifugal blowers:
• 1.Ventilation: Centrifugal blowers can be used for ventilation in buildings to eliminate indoor odors, moisture, and turbidity, and keep indoor air fresh and comfortable.
• 2.Heating and cooling: Centrifugal blowers can be used as part of a heating or cooling system to regulate the temperature of a room or equipment by circulating air or conducting heat.
• 3.Enhance combustion: The centrifugal blower can be used to pressurize the gas combustion during the combustion process to improve combustion efficiency and combustion stability.
• 4.Air guide and exhaust: Centrifugal blowers can be used in air guide ducts or systems to provide gas power for other machines or equipment, and can also be used to discharge waste gas, flue gas or dust.
• 5.Dust removal and cleaning: Centrifugal blowers are often used in dust removal systems in industrial production. By generating strong wind, dust or other pollutants in the discharged materials are collected and filtered to keep the air clean.
• 6.Drying and drying: Centrifugal blowers can be used in the drying and drying process in industrial production to take away moisture from the surface of materials through wind force and speed up the drying speed.
• 7.Gas supply boosting: Centrifugal blowers can be used to pressurize or supply gas, such as oxygen supply systems, compressed air supply, etc.
• 8.Metallurgical process: Centrifugal blowers are widely used in the metallurgical industry, such as ventilation, blasting and pressurization of metallurgical furnaces, blast furnaces, steel-making furnaces, etc.

How does a centrifugal blower work?centrifugal fan working principle

• The working principle of a centrifugal blower is to use the centrifugal force generated by a working wheel equipped with many blades to squeeze the air to achieve a certain air volume and pressure.
• When the motor rotates, the impeller rotates with it. When the impeller rotates, it generates centrifugal force to throw the air out of the impeller. The air is collected in the casing. Due to the slow speed and high pressure, the air is discharged from the ventilator outlet and flows into the pipe. When the air in the impeller is discharged, a negative pressure is formed. The air outside the suction port is forced into the impeller under the action of atmospheric pressure, so that the impeller continues to rotate and the air continues to flow in the pipe under the action of the ventilator.
• Specifically, the working process of the centrifugal blower can be divided into the following steps:
• ‌Gas entry‌: Gas enters the impeller from the axial direction, and the impeller rotates at high speed to generate centrifugal force.
• Gas acceleration‌: The gas is affected by centrifugal force in the impeller, is accelerated and thrown toward the casing.
• ‌Kinetic energy conversion‌: The gas decelerates in the diffuser, kinetic energy is converted into pressure energy, and the pressure increases.
• ‌Gas discharge‌: Gas is discharged from the ventilator outlet and enters the pipe.
• ‌Circulation‌: Due to the negative pressure caused by the outflow of gas, outside air is automatically replenished and enters the impeller, and the cycle proceeds‌.

centrifugal fan working principle

Types of centrifugal fans

• The types of centrifugal fans mainly include the following: single-suction centrifugal fans, double-suction centrifugal fans, high-pressure centrifugal fans, static pressure box-type centrifugal fans and medium-pressure centrifugal fans‌. Each of these types of centrifugal fans has its own specific application scenarios and performance characteristics.
• ‌Single-suction centrifugal fan‌: Single-suction centrifugal fan, also known as front-suction centrifugal fan, is suitable for transporting general gases and has a small air volume range.
• Double-suction centrifugal fan‌: Double-suction centrifugal fan, also known as rear-suction centrifugal fan, is suitable for use when pressure is high, air volume is large, and starting torque is small.
• ‌High-pressure centrifugal fan‌: High-pressure centrifugal fan is mainly used to transport high-pressure gas, such as blowers, compressors, etc.
• ‌Static pressure box-type centrifugal fan‌: often used to eliminate noise and vibration during work and increase air volume and wind pressure.
• Medium-pressure centrifugal fan‌: Suitable for transporting gases with high dust content, high flue gas temperature or condensation water, etc.
• In addition, centrifugal fans can be further subdivided according to different classification standards. For example, according to pressure and function, there are ventilators, blowers and compressors; according to working principles, there are centrifugal fans, axial fans and rotary fans. Each type of fan has its own unique design and applicable scenarios to meet different industrial and civil needs‌.

centrifugal fan working principle

What is the difference between a centrifugal fan and a blower?

• The main differences between centrifugal fans and blowers are their working principles, application scenarios, pressure and flow characteristics, and efficiency and energy consumption. ‌
• The working principle is different‌. The centrifugal fan relies on a high-speed rotating impeller to generate centrifugal force to accelerate and discharge the gas. The gas gains kinetic energy under the action of the impeller and is discharged. A blower also uses centrifugal force generated by an impeller to move air, but its design is usually more compact and suitable for achieving high air flow at lower pressure.
• The application scenarios are different. Centrifugal fans are widely used in factory ventilation, cooling towers, vehicle and ship ventilation, boiler and industrial furnace ventilation and other fields. Blower blowers are typically used in applications that require higher air flows, such as forced-air heating systems, air conditioning equipment, and industrial drying.
• ‌Pressure and flow characteristics are different‌. The exhaust pressure of centrifugal fans is low, but the flow rate is large. It is suitable for occasions where the pressure requirement is not high but a large amount of air flow is required. Blower, on the other hand, can achieve higher airflow at lower pressure and is suitable for applications requiring high airflow.
• Efficiency and energy consumption are different. While centrifugal fans can achieve higher efficiencies, blowers are more efficient in applications that require high airflow at lower pressures because their compact design and high-speed operation help save energy.

What is the function of centrifugal fan blower?

• Centrifugal blower is a common fluid mechanical equipment that transports or compresses gas through centrifugal force. It is widely used in various industries such as metallurgy, chemical industry, electric power, and water treatment. Its main functions include the following aspects:
• 1.Air delivery: Centrifugal blowers can deliver a certain gas flow to a designated location. For example, in the industrial production process, air needs to be transported to sintering furnaces, furnaces and other equipment, and centrifugal blowers can play an important role.
• 2.Compressed air: A centrifugal blower can compress air under atmospheric pressure into high-pressure gas. In fields such as chemical industry and petroleum, air compressors can provide the required compressed air for program operations, equipment opening, and combustion.
• 3.Exhaust gas: In some production processes, some toxic and harmful gases will be produced, which need to be discharged through the exhaust system. Centrifugal blower is one of the important exhaust equipment.

The working principle and characteristics of centrifugal blower

• The working principle of the centrifugal blower is to use centrifugal force to suck in the gas, and then compress the gas through the rotation of the impeller and discharge it. The biggest feature of the centrifugal blower is that it has the advantages of large flow rate and high pressure, and can adapt to the needs of different industries and different scales.
• When using a centrifugal blower, you need to pay attention to the following points:
• 1.Select the appropriate centrifugal blower model and specifications, and accurately match them according to actual needs.
• 2.Carry out regular cleaning and maintenance to ensure the normal operation of the centrifugal blower and prevent potential damage to the equipment caused by pollutants.
• 3.Adjust the voltage and frequency of the centrifugal blower to ensure normal operation and long-term use of the equipment.

Recommendations for the correct use and maintenance of centrifugal blowers

• 1.Before starting the centrifugal blower, you need to check whether there are any abnormalities in the equipment and whether the voltage is normal to ensure normal operation.
• 2.The centrifugal blower needs to be used in a dry and well-ventilated place, and make sure there are no flammable, explosive or other dangerous substances around it.
• 3.Regularly carry out maintenance work such as oil filter, motor angkara and air leakage detection of the centrifugal blower to avoid equipment failure.
• 4.For high temperature or corrosive gases, centrifugal blowers made of special materials can be used to ensure the endurance and service life of the equipment.
• In general, centrifugal blowers are widely used in various fields, and their functions and characteristics have attracted more and more attention. Therefore, the correct use and maintenance of centrifugal blowers can not only ensure the normal operation of the equipment, but also improve its service life and work efficiency.

What is the difference between a centrifugal blower and a Roots blower?

• 1.The working principle is different. The centrifugal fan uses curved blades to throw the gas to the casing by centrifugal force, while the Roots blower uses two 8-shaped blades. The gap between them is very small. The squeezing of the blades squeezes the gas to the outlet.
• 2.Due to different working principles, generally their working pressures are different. The outlet pressure of Roots blower is relatively high, while the centrifugal blower is relatively small.
• 3.The air volume is different. Roots blowers are generally used in places where the air volume is not high but the pressure is high, while centrifugal fans are used in places where the pressure is low and the air volume is high.
• 4.The manufacturing precision is different. Roots blowers require high precision and strict assembly requirements, while centrifugal fans are relatively loose. Generally speaking, Roots blowers have high pressure and small air volume; centrifugal blowers have high air volume and low pressure! Therefore, the use occasions are distinguished according to the required air volume and wind pressure.

types of centrifugal fans / fan centrifugal

• According to different impeller types, centrifugal fans can be divided into the following categories:
• 1.Front-spray centrifugal fan: The impeller is of the front-spray type, and the gas enters vertically from the center of the impeller. The air volume is small and the pressure is low. It is often used in small ventilation or air delivery drying equipment.
• 2.Rear-jet centrifugal fan: There is a nozzle behind the impeller, and the incoming gas is sprayed to the back of the impeller, which can produce high gas pressure and air volume. It is suitable for a variety of ventilation, ventilation and heating/cooling applications.
• 3.Pull-type centrifugal fan: The impeller is reversed, which means that the impeller faces outward. It is suitable for processing high-concentration gases containing solid impurities, and can also be used for applications involving higher air flow speeds.
• 4.Diagonal flow centrifugal fan: The axis of the impeller and the axis of the air inlet form a certain angle. After the gas in the air inlet enters the impeller, it is forced to turn to the exhaust port along the diagonal flow channel, so that the gas flows through the impeller. Improve efficiency.
• According to different characteristics, centrifugal fans can be divided into the following categories:
• 1.Medium-pressure centrifugal fans: Centrifugal fans whose main field is the medium-pressure range of 50~300Pa can handle a certain amount of air, dust and other impurities, and are often used in air conditioning and ventilation systems.
• 2.Low-pressure centrifugal fan: The air pressure is below 50Pa. It is mainly applicable to cold winter heating equipment.
• 3.High-pressure centrifugal fans: Centrifugal fans with a main range of 300~3000Pa have strong processing capabilities and high requirements for noise and vibration. They are suitable for oxygen generation, hydroxide escape, catalyst regeneration, etc.
• 4.Axial flow centrifugal fan: The impeller has a spiral line at a 45° angle, which can handle low pressure and high flow conditions. It is the first choice for large ventilation and air conditioning equipment.

Centrifugal fan working principle

• The working principle of a centrifugal fan is to use a high-speed rotating impeller to accelerate the gas, and then convert the kinetic energy into potential energy (pressure) by decelerating and changing the flow direction.
• The centrifugal fan is mainly composed of air inlet, impeller, deflector, casing and motor. When working, the motor drives the impeller to rotate at a high speed, and the gas from the air inlet is sucked into the impeller. After the impeller accelerates the gas, it is discharged through the deflector and casing. The working principle of the centrifugal fan is based on the action of centrifugal force. When the impeller rotates at high speed, the gas is accelerated to the action of centrifugal force, thus creating a pressure difference. The pressure of the gas at the air inlet is low, while the pressure of the gas at the air outlet is high. Therefore, the gas will flow from the air inlet to the air outlet along the pressure gradient.

Centrifugal fan application

• 1.Can be used for ventilation, cooling and dust exhaust:
• (1) Centrifugal fans are widely used and can be used in factories, workshops, warehouses and other departments to ventilate and speed up air circulation to ensure fresh air in these places, which is helpful for the purification of the working environment and the health of workers. At the same time, Equipped with centrifugal fans in factory warehouses to dry the air, it is helpful to preserve mechanical equipment or other industrial products.
• (2) Centrifugal fans can also be used in mines and tunnels to help circulate air in mines and tunnels. Fresh air can re-enter and discharge dirty air in a timely manner. Moreover, centrifugal fans can also play a role in dust removal and help It is used to improve the air transparency in mines and tunnels and improve the working environment of mine and tunnel workers.
• (3) Centrifugal fans can be used in cars, ships and buildings to provide ventilation and promote the replacement of fresh air, so that there is sufficient fresh air inside cars, ships and buildings.
• 2.Ventilation and draft induction:
• At present, centrifugal fans are commonly used in industrial boilers, gas furnaces, and coal-fired furnaces. They mainly play the role of ventilation and draft induction, fully supplying the oxygen-rich air needed for industrial furnace production, allowing the industrial furnace to burn more fully, and the furnace temperature reaches the production level. When needed, it can also improve the production and working environment of industrial furnace rooms and eliminate harmful gases in a timely manner.
• 3.Drying and cooling in agricultural production:
• In large agricultural processing plants, food processing plants and other places, centrifugal fans can inject a large amount of air, promote air flow, promote the drying of grains, wheat, and grain, and facilitate timely storage; centrifugal fans can be used for the selection of impurities such as wheat, grains, etc. After treatment, wheat and grains are purer and have fewer impurities.
• 4.Inflate and push:
• The Longgu centrifugal fan can create artificial wind source. The centrifugal fan can use its own characteristics to create artificial wind to inflate large hovercraft or other inflatable objects, or be used as power to propel the hovercraft forward in the water.
• Centrifugal fans have many functions and uses and are used in pneumatic conveying, sewage treatment, powder conveying, food processing, aquaculture and other industries.

What is a centrifugal fan?

• The centrifugal fan is a ventilation, ventilation or air supply equipment designed and manufactured according to Euler's theorem and the law of conservation of mass. It is a fan that uses the kinetic energy of the rotor to increase the gas pressure, or uses the kinetic energy of the inlet speed to correspondingly reduce the static pressure to reach a certain air volume.
• Centrifugal fans are not only widely used in industrial and civil buildings in air conditioning, environmental protection, refrigeration, heating, drying and other fields, but also have important applications in transportation, mining, metallurgy, energy and other fields. Its main functions are: increasing air pressure, flow, forming airflow, etc.
• The centrifugal fan is mainly composed of a motor, volute, impeller, air inlet and outlet, pipe opening, centrifuge oil plug, inlet air chamber and other components. Among them, the motor is powered by a power supply to drive the impeller to rotate; the impeller is the core part of the centrifugal fan. Its speed, impeller outer diameter, blade angle and other factors will affect the gas flow and wind pressure of the centrifugal fan. At the same time, the material of the impeller also affects the use of the centrifugal fan. Lifespan and reliability are greatly affected.
• The function of the volute is to convert the kinetic energy of rotation into static heat energy, thereby increasing the air pressure; the air inlet and outlet are used to introduce and discharge gas; the pipe opening is used for pipe connection to facilitate gas transportation; the centrifuge oil plug is used to lubricate the centrifuge bearings to reduce wear; the inlet air chamber is used to increase the inlet kinetic energy and eliminate the difference in upper and lower wind speeds.
• The most common types of centrifugal fans include single-suction centrifugal fans, double-suction centrifugal fans, centrifugal fans with guide vanes, centrifugal fans without guide vanes, diagonal flow centrifugal fans, centrifugal fans, and centrifugal fans.
• Features
• 1.Generate greater air volume and pressure: Because the centrifugal fan adopts centrifugal force in physical principles, it can produce greater air volume and pressure, thereby achieving more effective ventilation and exhaust.
• 2.Simple structure: Compared with other ventilation equipment, the centrifugal fan has a very simple structure and is very convenient to use and maintain.
• 3.Various models: There are many models of centrifugal fans to meet the needs of different occasions, such as: single suction centrifugal fan, double suction centrifugal fan.