What does a cabinet centrifugal fan consist of?

Cabinet centrifugal fan is a high-efficiency, low-noise cabinet centrifugal fan, which has the advantages of high temperature resistance, excellent performance, novel and compact structure, small vibration, light weight, easy installation and use. It is an ideal product for ventilation and smoke exhaust in hotels, restaurants, auditoriums, theaters, basements, factories and mines, office buildings and other places.

The cabinet fan is compact and beautiful, and the fan box is designed with frame and box plate assembly. The frame of the cabinet fan is made of the domestic advanced metal cold-formed forming unit stretched at one time, the box plate is a compound plate structure, and the inner layer is a silencing material to further reduce the noise. Cabinet fans provide different inlet and outlet directions to meet the different installation needs of users.

The main components of the cabinet fan can be assembled after disassembly, and on the basis of digestion and absorption of the products of the American LAU Industrial Company, all of them are produced by molds. It is a multi-wing strong forward curved blade impeller, which has the characteristics of high efficiency, low noise, large air volume, stable operation, stable quality and durability. THFC cabinet fan volute is made of high-quality galvanized sheet and mechanized production.

The cabinet fan is divided into two types: type A and type B, and the type A motor is installed outside the box for fire fighting and smoke exhaust; The B-type motor is installed in the box, and the cabinet-type fan motor for ventilation is installed outside the box, and is isolated and separated from the high-temperature smoke exhaust series to ensure that the fan runs continuously for more than 60 minutes at a high temperature of 300 meters"National Quality Inspection Center for Fixed Fire Extinguishing Systems and Refractory Components"The test is qualified, and its performance has reached the domestic leading level. In order to meet the requirements of the growing development of air conditioning, purification industry and environmental protection and noise reduction, the low-noise cabinet centrifugal fan is a new product that has been successfully redesigned and developed under the premise of digesting and absorbing advanced technology at home and abroad, using the principle of combining pneumatics and aeroacoustics. It has the characteristics of large air volume, high full pressure, low noise and low vibration, and meets the requirements of environmental protection and labor protection.

The utility model discloses a cabinet-type centrifugal fan, comprises motor, box, vortex shell and impeller assembly, and the air inlet distance formed by described box and vortex casing both sides is double impeller diameter size; The impeller assembly comprises two supports, a bearing piece arranged on the two supports, a rotating shaft that connects the bearing pieces that are horizontally and horizontally arranged and an impeller group that is arranged on the rotating shaft, and the two supports are of combined structure. The utility model discloses an ingenious design, is more reasonable in structural proportion and structural composition. Compared with the previous technology, it can effectively improve the overall pneumatic efficiency of the cabinet centrifugal fan, reduce the loss of air flow inside the box, and achieve the characteristics of ideal air pressure and large air volume.

At the same time, the harmful working load of the motor is reduced, which is predictable, significantly reduces the energy consumption of the motor, improves the configuration efficiency, and is an innovation and improvement of cabinet centrifugal fan technology.

Compact and beautiful, the purpose of the early design of the cabinet series fan is to reduce the noise, and the overall chassis is a frame and box structure. In terms of the structure of the cabinet frame material selection, the fans are manufactured together and are selected as the domestic advanced one-time stretching metal. The accuracy of the design is very high, and there has been a great improvement in the import and export aspects, which can facilitate the direction design of each import and export.

In the future, the disassembly aspect can be more aspect. After years of production experience and design impeller has been greatly improved, which has improved the good quality of high efficiency, low noise, smooth operation, wear resistance and durability. In a certain situation, choosing a cabinet centrifugal fan is a good choice for you, but you also need to choose a centrifugal fan according to your real needs.

Summary. Hello, the working principle of centrifugal fan is basically the same as that of turbine compressor, but due to the low gas flow rate and little change in pressure, there is generally no need to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid.

What is the structure and working principle of a centrifugal fan.

Hello, the working principle of centrifugal fan is basically the same as that of turbine compressor, but due to the low gas flow rate and little change in pressure, there is generally no need to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid.

The structure is shown below.

Summary. The gas is accelerated by an impeller that rotates at high speed.

What is the structure and working principle of a centrifugal fan.

The gas is accelerated by an impeller that rotates at high speed.

The working principle of centrifugal fans.

Centrifugal fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas, and it is a driven fluid machine. Centrifugal fans are widely used for ventilation, dust removal and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air for boilers and industrial furnaces; cooling and ventilation in air-conditioning equipment and household appliances; drying and selection of grains; Wind tunnel wind source and hovercraft inflation and propulsion, etc.

According to the principle of converting kinetic energy into potential energy, the centrifugal fan uses a high-speed rotating impeller to accelerate the gas, and then decelerates and changes the flow direction to convert kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller axially, changes to radial as it flows through the impeller, and then enters the diffuser. In a diffuser, the gas changes the direction of flow and the pipe cross-sectional area increases to slow down the air flow, and this deceleration converts kinetic energy into pressure energy.

The increase in pressure occurs mainly in the impeller and to a lesser extent in the expansion process. In a multistage centrifugal fan, a reflux is used to bring the air to the next impeller, creating a higher pressure.

1.Structure of centrifugal fan: Centrifugal fan is mainly composed of motor, impeller, volute, air intake, air inlet, diffuser, air guide ring, shaft and bearing and other components, of which the wind wheel is composed of blades, front disk, rear disk and hub.

2.The working principle of centrifugal fans.

When the wind wheel of the fan is driven by the motor warp shaft to rotate, the gas between the blades rotates at high speed under the impetus of the blades, so that the gas obtains a large amount of energy, and under the action of high inertia and high centric force, it is thrown to the outer edge of the impeller, and after the pressure and kinetic energy of the gas increases, it flows out of the volute shell, and the middle part of the impeller forms a negative pressure, and the gas is continuously inhaled to supplement under the action of atmospheric pressure.

The shaft of the fan is connected to the motor shaft by a coupling or pulley. When the motor rotates, the impeller of the fan rotates with it. When the impeller rotates, it generates centrifugal force to throw the air out of the impeller, and the air is thrown out of the impeller and collects in the casing, and due to the slow speed and high pressure, the air is discharged from the ventilator outlet and into the pipe.

When the air in the impeller is discharged, a negative pressure is formed, and the air outside the suction port is pressed into the impeller under atmospheric pressure. As a result, the impeller rotates and the air flows through the ducts under the action of the ventilator.

Working principle: When the motor rotates, the impeller of the fan rotates with it. When the impeller rotates, it generates centrifugal force to throw the air out of the impeller, and the air is thrown out of the impeller and collects in the casing, and due to the slow speed and high pressure, the air is discharged from the ventilator outlet and into the pipe.

When the air in the impeller is discharged, a negative pressure is formed, and the air outside the suction port is pressed into the impeller under atmospheric pressure. As a result, the impeller rotates and the air flows through the ducts under the action of the ventilator.

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Multi-wing centrifugal fan structure:

Multi-wing centrifugal fans are generally composed of impellers, casings, collectors, motors and transmission parts (such as spindles, pulleys, bearings, V-belts, etc.). The impeller is composed of a wheel disc, blades (the number of blades is generally 8 16), a wheel cover, and a shaft disc. The chassis consists of worms, side plates, and outriggers.

The centrifugal fan can use forward or backward blades, which is more suitable for the requirements of air volume and pressure. Moreover, the cabinet can be muffled, which has obvious advantages in noise indicators. The motor and the fan are generally connected by shafts.

The multi-wing centrifugal air can be made into two types: right-handed and left-handed. Looking squarely from the side of the motor, the impeller rotates clockwise, which is called a right-hand rotating fan, and counterclockwise, which is called left-handed.

Basic principle of multi-wing centrifugal fan:

Multi-wing centrifugal fan is a kind of machinery that relies on input mechanical energy to increase gas pressure and discharge gas, which is widely used in ventilation, dust removal and cooling silver in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air for boilers and industrial furnaces; cooling and ventilation in air-conditioning equipment and household appliances; drying and selection of grains; Wind tunnel wind source and hovercraft inflation and propulsion, range hood exhaust fume, etc. According to the principle of kinetic energy conversion into potential energy cracking, it uses a high-speed rotating impeller to accelerate the gas, then decelerates and changes the flow direction, so that the kinetic energy is converted into potential energy (pressure), and then realizes the functions of ventilation or dust removal.

The multi-wing centrifugal fan is essentially a variable flow constant pressure device. Because its working principle is basically the same as that of turbocompressors, but due to the low gas flow rate and small pressure change, there is generally no need to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid. When the speed is constant, the theoretical curve of the pressure and flow rate of the centrifugal fan should be a straight line.

Due to the loss of the internal frontal source scale, the actual characteristic curve is curved.

Multi-wing centrifugal fan function:

Multi-wing centrifugal fans are widely used for ventilation, dust removal and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air for boilers and industrial furnaces; cooling and ventilation in air-conditioning equipment and household appliances; drying and selection of grains; Wind tunnel wind source and hovercraft inflation and propulsion, etc.

The working principle of the centrifugal fan.

Centrifugal fan. The reason is basically the same as that of turbine compressors, because the gas flow rate is low and the pressure changes little, and generally does not need to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid.

The centrifugal fan can be made into two types: right-hand and left-hand. From the side of the motor: the impeller rotates clockwise, which is called the right-hand rotating fan; The impeller rotates counterclockwise, which is called a left-hand rotating fan.

1. Fully familiar with the sample of the cabinet centrifugal fan, familiar with the specifications, form, impeller rotation direction and airflow in and out direction of the cabinet centrifugal fan, etc., the cabinet centrifugal fan should be checked before installation of the impeller for rubbing, and the components should be comprehensively inspected, whether the accessories are complete, whether the connection of each component is firm, and carefully check whether the fan blade is damaged or deformed due to transportation, otherwise it should be repaired before installation.

2. The wiring of the cabinet centrifugal fan must be correct and reliable, and the shell of the fan should be properly grounded, and the grounding must be reliable. The power supply to the cabinet centrifugal fan must be complete and meet the relevant requirements. Electrical wiring must be done by an electrician with specialized knowledge of wiring.

3. The air duct connecting the inlet and outlet of the cabinet centrifugal fan should have a separate support, and the weight of the pipe is not allowed to be added to the parts of the fan.

As shown in Figure 4-59, the impeller is installed in the shell, the pulley is connected to the motor through the transmission belt, the motor rotates and drives the impeller to rotate, and the air enters the fan through the axial air inlet, and the centrifugal force generated by the rotating impeller causes the air to be sent into the shell through the impeller, and then sent to the air outlet along the warp direction for discharge.

Because the shape of the blade is slightly bent forward in the direction of rotation, it cannot be reversed when used, although it can also supply air when reversed, but due to the small wind pressure, the air volume is less than 50% of the forward rotation.

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Figure 4-59 Structure of a centrifugal fan.

1.Air inlet 2Impeller 3Enclosure 4Pulleys 5Bearing 6Air outlet 7Motor.