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| No.13676740
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Information Name: | Supply of low noise F4-72 FRP centrifugal fan type exhaust fan |
Published: | 2015-03-27 |
Validity: | 365 |
Specifications: | F4-72 |
Quantity: | 5000.00 |
Price Description: | |
Detailed Product Description: | Centrifugal Fan principle: Gas centrifugal fan blade in between the impeller rotates, centrifugal force obtained by the kinetic energy (dynamic pressure) is discharged from the impeller periphery, through the volute casing shaped guide, so that the outlet flow to the fan, thereby forming a negative pressure in the central part of the impeller, the external air stream flow into complementary, so that fans can exhaust gases. Motor through the power transmission shaft to the fan impeller, the impeller rotates to transfer energy to the air, the effect of air under rotation of the centrifugal force, the extension of the air diffusion vanes surrounding the impeller blower, at this time, the greater the fan impeller, the energy received by the air The larger is the fan pressure head (pressure) increases. If a large impeller cutting small, does not affect the amount of wind, air pressure will decrease. Centrifugal fan impeller and casing composed mainly of small fan impeller is mounted directly on the motor, the large fan by coupling or connection with the motor pulley. Usually unilateral centrifugal fan inlet, with a single-stage impeller; flow can be bilateral intake, with two back to back impellers, also known as double-suction centrifugal fan. Fan impeller is the main component, its geometric shape, size, number of blades, and the manufacturing accuracy has a great influence on performance. Static balance impeller or fan balancing correction in order to ensure smooth rotation. The export orientation of different blade impeller into forward, radial and backward three types. Front tilt toward the top of the impeller vanes of the impeller rotation direction; top blade radial impeller is in the radial direction, is divided straight blade and curved blade; after rotating reverse tilt toward the top of the impeller vanes of the impeller. Maximum pressure, the flow rate and the number of revolutions constant forward impeller, the minimum, but the efficiency is generally lower impeller diameter needed; opposite to the impeller after pressure, the resulting minimum, desired maximum impeller diameter, while the efficiency is generally higher ; radial impeller in between. Vane-type lines straight blade simplest and most complex airfoil blades. In order to have the right blade surface velocity distribution, generally using curved blades, such as blades, such as the thickness of the arc. Impeller cover discs usually have to increase the strength of the impeller and reduce gas leakage between the blade and the casing. Coupling the blade with the cover plate by welding or riveting. Lighter weight impeller welding, smooth flow. Low, medium small centrifugal fan impeller is also made of aluminum alloy casting. Common faults and solutions: Symptom A Symptom: vibration cause centrifugal fan rotor imbalance caused by: a centrifugal blower fan blades are severe corrosion or wear; 2, do not run after the fan blade assembly, due to the impeller and spindle own weight, so that the shaft is bent; 3, impeller uneven surface adhesion substances, such as rust, fouling or asphalt; 4, transportation, installation or other reasons, resulting in deformation of the impeller, the impeller causing loss of balance; 5, impeller Not looking for a block off balance or equilibrium after overhaul; treatment methods: 1, repair or replacement; 2, re overhaul, not long after the assembly as a regular disk drive should be to prevent the shaft bending; 3, removal of attachments; 4, wheel repair, re do static and dynamic balance test; 5, to find a balance; Symptom 2 Symptom: centrifugal fan fixings resonance reasons: a bad light or grout or cement foundation plane size is too small, causing the fan base out of touch with the ground, ground Foot loose bolts, frame connection is not secure enough to make it the basis of rigidity; 2, fan base or volute low stiffness; 3, I'm not connected to the pipe and fan support and software plus links; 4, near the facilities and the fan base too close, or just too small; one, strengthening the foundation or re-grouting, tighten the nut; treatment methods: 2, to enhance its rigidity; 3, plus support and soft connection; 4, increasing rigidity; Symptom three Symptom: centrifugal Fan bearing overheating reasons: 1, parts and friction bearing box centrifugal fan spindle or spindle; 2, the motor shaft and fan shaft misalignment, Rolling bearing inner box do not move; 3, bearing lubrication cabinets excessive fat; 4, between the bearing and the bearing housing bore clearance loose bearing housing bolts too tight or too loose; treatment methods: 1, check which parts of friction, and then dealt with; two, two-axis adjustment concentricity; 3, inside the grease tank space for 1/3 ~ 1/2; 4, adjusting bolt; |
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Copyright © GuangDong ICP No. 10089450, FRP Co., Ltd. Hebei RAJ All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility
You are the 12488 visitor
Copyright © GuangDong ICP No. 10089450, FRP Co., Ltd. Hebei RAJ All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility