Noise Absorption Device for Air Blower

摘要

An air blower is provided with an upper resonant chamber including an upper cover having an opening, an upper casing having an inlet engaging the opening, the upper casing secured to the upper cover to form a first chamber, first apertures through portions of the upper casing other than the inlet and communicating with the first chamber, and a first noise absorption material in the first chamber; a lower resonant chamber including a lower cover, a lower casing secured to the lower cover to form a second chamber, second apertures through the lower casing and communicating with the second chamber, and a second noise absorption material in the second chamber. The upper casing is on the lower casing to form a flow path. An impeller is in the flow path. In response to resonance, noise can be absorbed by the first and second absorption materials and converted into heat.

主权项

1. An air blower comprising:
an upper resonant chamber including an upper cover having an opening, an upper casing having an inlet having a top engaging the opening, the upper casing secured to the upper cover to form a first chamber, a plurality of first apertures through portions of the upper casing other than the inlet and communicating with the first chamber, and a first noise absorption material disposed in the first chamber; a lower resonant chamber including a lower cover, a lower casing secured to the lower cover to form a second chamber, a plurality of second apertures through a bottom of the lower casing and communicating with the second chamber, and a second noise absorption material disposed in the second chamber wherein the upper casing is disposed on the lower casing to form a spiral flow path; an impeller disposed in the spiral flow path; and an outlet disposed at an end of the spiral flow path; wherein in response to activating the air blower, noise generated by the impeller enters the upper resonant chamber via the first apertures and the lower resonant chamber via the second apertures respectively, air in the upper resonant chamber vibrates to friction the first noise absorption material and the first apertures, and air in the lower resonant chamber vibrates to friction the second noise absorption material and the second apertures when frequencies of vibration of both the upper and lower resonant chambers match frequency of vibration of the impeller so that acoustic energy is absorbed by the first and second absorption materials and converted into heat.