HVAC Service Call: Belt Driven Centrifugal Exhaust Fan Not Working (Broken Pillow Block Bearings)
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- เผยแพร่เมื่อ 27 ส.ค. 2021
- HVAC Service Call: Belt Driven Centrifugal Exhaust Fan Not Working (Broken Pillow Block Bearings)
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(CAMERA USED IN THIS VIDEO BELOW)
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Thanks for watching!
Email: JumperManTech@Gmail.com
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A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, biscuit blower[citation needed], or squirrel-cage fan (because it looks like a hamster wheel). These fans increase the speed and volume of an air stream with the rotating impellers.
Centrifugal fans use the kinetic energy of the impellers to increase the volume of the air stream, which in turn moves against the resistance caused by ducts, dampers and other components. Centrifugal fans displace air radially, changing the direction (typically by 90°) of the airflow. They are sturdy, quiet, reliable, and capable of operating over a wide range of conditions.
Centrifugal fans are constant-displacement or constant-volume devices, meaning that, at a constant fan speed, a centrifugal fan moves a relatively constant volume of air rather than a constant mass. This means that the air velocity in a system is fixed even though the mass flow rate through the fan is not.
Centrifugal fans are not positive-displacement devices and centrifugal fans have certain advantages and disadvantages when contrasted with positive-displacement blowers: centrifugal fans are more efficient, whereas positive-displacement blowers may have a lower capital cost.
The centrifugal fan has a drum shape composed of a number of fan blades mounted around a hub. As shown in the animated figure, the hub turns on a driveshaft mounted in bearings in the fan housing. The gas enters from the side of the fan wheel, turns 90 degrees and accelerates due to centrifugal force as it flows over the fan blades and exits the fan housing.
Each blade type varies in terms of efficiency - in other words, how fast the fan moves air through the duct or system where it’s installed. The most important thing to know is that backward curved blades are the most efficient, whereas forward curved blades are one of the least efficient types of fans.
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A pillow block usually refers to a housing with an included anti-friction bearing, wherein the mounted shaft is in a parallel plane to the mounting surface, and perpendicular to the center line of the mounting holes, as contrasted with various types of flange blocks or flange units. A pillow block may contain a bearing with one of several types of rolling elements, including ball, cylindrical roller, spherical roller, tapered roller, or metallic or synthetic bushing. The type of rolling element defines the type of pillow block. These differ from "plummer blocks" which are bearing housings supplied without any bearings and are usually meant for higher load ratings and a separately installed bearing. Plummer block bearings are designed for more corrosive environments.
The fundamental application of both types is the same, which is to mount a bearing safely enabling its outer ring to be stationary while allowing rotation of the inner ring. The housing is bolted to a foundation through the holes in the base. Bearing housings may be either split type or solid type. Split type housings are usually two-piece housings where the cap and base may be detached, while solid are single-piece housings. Various sealing arrangements may be provided to prevent dust and other contaminants from entering the housing. Thus the housing provides a clean environment for the environmentally sensitive bearing to rotate free from contaminants while also retaining lubrication, either oil or grease, hence increasing its performance and duty cycle.
Man that was a 3 man job , this was the hardest job i have seen from you.
I like these vids a lot. I pick up small tips as a home diy'er. Thanks!
Great video! You did a fantastic job explaining the topic, and the visuals were helpful. I especially liked how you included examples to help illustrate your points. Keep up the good work!
You need small crescent wrenches in your tool bag. I've ran into similar issues with the bolt had no play and can't fit even thin wall socket to loose up bolt. Small crescent worked like a miracle. I like that small Milwaukee grinder, I'll be adding that to my tools
Tough service call but beautiful view
Open. END wrench
Not sure how long you have been doing this kind of work but….. as a 34 year Commercial / Industrial HVAC tech you did a good job given the working conditions. 👍
You the MAN! A lot of ppls will turn their back to this kind of job! Great stuff, you have made lots of learning videos for the newbies.
Dang! I do this at work all the time. Pillow blocks new shafts motors condenser towers etc but you my man did it by yourself for the most part ! Props to you!
Yo this was the toughest job I’ve seen on this channel yet. Nice work. I know nothing about HVAC and love learning stuff watching your vids. Keep uploading!
hello Mister Jumper man !!! I like very mutch to see you !!!! good job !!!
Another great video. I live in a small rural Missouri Town. I cannot even imagine working under the conditions you work in
Hard job. Thanks for sharing this experience with us. Interesting and helpful video. You the man JMT.
Damn gotta give you props for this job it was a tough one. Love the content.
Your a Beast bro !!! I service a similar exhaust fan unit in our building that runs 12 floors, key to save those bearings and expand their lifetime is wipe off old grease and build up , and grease them up every 3 to 6 months .
Thanks for sharing, stay safe out there brother!
WOW! that looks terrifying😭 amazing work JMT✨
Nice removal bud 👍🏻 the easy part is putting it back together 👍🏻
Great video.Hard work. Proud of you
Hard and good job jm👍👍👍