How to distinguish between a blower and a centrifugal fan?
Release time:
2022-06-29
The shaft of a certain waste treatment plant's induced draft fan is worn out, and there is only one day for maintenance. Therefore, they contacted us to inquire whether the Sorey carbon nanomaterial technology can quickly repair it. The technology process for effectively solving the wear problem of the induced draft fan shaft at the waste treatment plant is as follows: Based on the spectral characteristic data obtained from actual tests of various industrial fans' operating noise sources, determine the required amount of sound absorption in which spectral range as the main basis for designing the sound-absorbing body and fluid channel. A narrow rectangular channel with a large sound-absorbing material surface is used to enhance the sound absorption effect.
Induced draft fans and centrifugal fans are two different products within the category of fans, and their main function is to ventilate and exchange air in the environment. As a non-professional consumer, if you do not know the difference between axial fans and centrifugal fans, blindly purchasing the wrong product will certainly not meet your expectations. So how can we distinguish between axial fans and centrifugal fans?
Different exhaust directions:
Induced draft fanThe exhaust direction of an axial fan is straight along the axis, with the air inlet and exhaust outlet on a parallel line to the axis, while the exhaust direction of a centrifugal fan is perpendicular to the air inlet direction, allowing for 360-degree directional exhaust.
An induced draft fan is a machine that creates negative pressure by the rotation of the impeller, extracting air from the system (machine equipment). It is generally installed at the tail of a boiler to extract hot flue gas from the furnace. Induced draft fans are commonly used for ventilation, dust removal, and heat dissipation in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings. A waste treatment plant's induced draft fan shaft was worn out, and there was only one day for maintenance, so they contacted us to inquire whether the carbon nanomaterial technology could quickly repair it. Data shows: shaft diameter 140mm, width 64mm, bearing model 22228B, wear depth 1-2mm, speed 800-1400r/min.
The technical process for efficiently solving the shaft wear problem of the induced draft fan in the waste treatment plant is as follows:
1. Bake oil and grind the worn shaft surface to remove high points and expose the original metal color;
2. Clean the surface with anhydrous ethanol to ensure the surface is free of oil and impurities, and dry;
3. Apply SD7000 release agent to the inner and side surfaces of the tooling;
4. Mix and evenly coat the carbon nanomaterial on the repair surface;
5. Install the tooling;
6. Remove the tooling after the material has cured and remove excess material;
7. Reinstall the bearing and verify the dimensions.
The ventilation and structural principles of the fan silencer:
Based on the spectral characteristic data obtained from actual tests of various industrial fan operating noise sources, determine how much sound absorption is needed within which spectral range as the main basis for designing sound-absorbing bodies and fluid channels, and use narrow rectangular channels with a large sound-absorbing material surface to improve sound absorption effectiveness. Additionally, when the fan's noise source is significant, its spectral values often exceed one, and the sound absorption requirements vary for different spectral frequencies.
Therefore, both the ventilation duct silencer and the fan silencer are impedance sound flow types, using impedance structures to absorb and silence high and mid-frequency noise, and to reduce mid-low frequency noise. At the same time, high-frequency and low-frequency sound absorption and silencing areas are used in the impedance channel to achieve good sound silencing and noise reduction effects.Induced draft fan消声器均为阻抗声流型，采用阻抗结构，对高中频噪声和低频噪声具有吸声和消声作用，对中低频噪声具有消声和降声作用。同时，在阻抗通道中采用高频和低频吸声和消声区域，达到良好的消声和降噪效果。
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