Resources Contact Us Home
Low noise impeller

Image Number 2 for United States Patent #4930981.

A blower for fluidized particulates has a housing with an inlet in one wall. The housing defines a chamber which also has an outlet. A rotatably mounted shaft projects into the interior of the chamber. Circumferentially spaced around and projecting laterally from the shaft are a plurality of blades which individually have a shape selected to substantially maximize the impulsive pressure on the particles delivered through the outlet upon rotation of the shaft. Each of those blades has a notch defined toward the shaft from the laterally outer blade periphery with that notch having a size and shape selected to significantly reduce noise created by movement of the blade across the outlet. A plurality of paddles individually project outwardly from and are circumferentially spaced around the shaft adjacent to and circumferential aligned with respective ones of the notches, with that spacing of each paddle from the corresponding adjacent blade being selected to augment reduction of the noise while maintaining maximization of the pressure.

  Recently Added Patents
Nanofibers containing latent reactive groups
Method of fabricating display device
Sense-amplifier monotizer
Carbon nanotube fiber spun from wetted ribbon
Inspection tool for top guides of a boiling water reactor
Crystalline form of (R)-7-chloro-N-(quinuclidin-3-yl)benzo[b]thiophene-2-carboxamide hydrochloride monohydrate
Image decolorizing device
  Randomly Featured Patents
Total containment welding of plastic tubes
Cross-slit collimator method and system
Heat sealable coating for manual and electronic marking and process for heat sealing the image
High frequency cable connector
Mobile terminal communication system
Air bag inflator
Device and process for producing a device for the catalytic generation of hydrogen from hydrocarbons
Ring damped composite transit wheel
Chair arm
Holding device, in particular for fixing a semiconductor wafer in a plasma etching device, and method for supplying heat to or dissipating heat from a substrate