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Explosion proof centrifugal fan
Explosion proof centrifugal fan - Structural characteristics Explosion proof centrifugal fan is mainly composed of impeller, casing, air inlet, regula
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Explosion proof centrifugal fan - structural characteristics
The explosion-proof centrifugal fan is mainly composed of an impeller, a casing, an air inlet, a regulating door, and a transmission part.(1) The impeller is composed of 12 rear inclined wing shaped blades welded between the arc-shaped wheel cover and the flat plate disc. Due to the use of wing shaped blades, the high efficiency, low noise, and high strength of the fan are ensured. The impeller runs smoothly after static and dynamic balance correction. The impeller structure of the ventilation and induced draft fans with the same machine number is the same.
(2) The casing is a snail shaped body welded from ordinary steel plates. The casing of the explosion-proof centrifugal fan is made into an integral structure. For the induced draft fan, there is a dust cleaning door on the volute plate, and it is appropriately thickened to prevent cigarette ash wear and extend its service life.
(3) The air inlet is a convergent streamlined overall structure, fixed to the inlet side of the casing with bolts.
(4) The regulating door is a device used to adjust the flow rate of the fan. No.8-12.5 consists of 11 petal shaped blades, No.l4-16
Composed of 13 braided blades, all installed axially in front of the air inlet. Due to the use of an external transmission structure, the rotation is flexible and convenient. The adjustment range is from 90 ° (fully closed) to 0 ° (fully open). Adjust the lever position of the door, looking from the direction of the air inlet, on the right side. For the right cyclone machine, pushing the lever from bottom to top is the direction from fully closed to fully open; For the left cyclone machine, pulling the lever from top to bottom is the direction from fully closed to fully open.
(5) The transmission method of the transmission group is all D-type. Composed of spindle, bearing box, coupling, etc. The spindle is made of high-quality steel. Adopting a rolling bearing water-cooled integrated bearing box. Therefore, it is necessary to install water pipes, and the water consumption varies depending on the ambient temperature, generally considered at 0.5-1m3/h. The bearing box is equipped with a thermometer and an oil level indicator.
Resonance caused by fixing components of explosion-proof centrifugal fan
Reason:1. The cement foundation is too light, the grouting is poor, or the plane size is too small, causing the fan foundation to disconnect from the foundation, the anchor bolts to loosen, and the machine base connection to be unstable, resulting in insufficient foundation stiffness;
2. The stiffness of the fan base or volute is too low;
3. The inlet and outlet pipelines connected to the fan are not supported or have soft connections;
4. The foundation of adjacent facilities and wind turbines is too close or just too small;
Handling method:
1. Strengthen the foundation or re grout, tighten the nuts;
2. Strengthen its rigidity;
3. Add support and soft connections;
4. Increase stiffness;
Reason for high temperature of explosion-proof centrifugal fan bearings:
1. Bearing damage;2. Incorrect selection of lubricating oil or grease;
3. The lubricating oil level is too high or insufficient;
4. Insufficient cooling water volume;
5. The motor and fan have different centerlines;
6. Rotor vibration;
Handling method:
1. Replace bearings;
2. Re select and replace with suitable oil products;
3. Adjust the oil level;
4. Increase the amount of cooling water;
5. Find radial and axial horizontal directions;
6. Find balance on the rotor.
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