Silencer and respirator therewith

Abstract

A noise reduction device used on rebreather is prepared as setting spiral air passage at internal of said device, arranging air inlet at external end of said air passage and air outlet at internal end center of said air passage, setting round arc-surface structure on side wall of spiral air passage and convex shoulder between side wall top-edge and air inlet. The said noise reduction device is installed at air inlet of fan on rebreather.

Description

technical field [0001] The invention relates to a noise reduction device and a ventilator using the noise reduction device. Background technique [0002] At present, non-invasive ventilators are the most common type of ventilators that use motors to drive the air source. Non-invasive ventilators are used for the treatment of respiratory diseases such as sleep apnea syndrome and COPD (chronic obstructive airway disease). The currently popular types of non-invasive ventilators mainly include CPAP (providing stable positive pressure output when the patient breathes), AUTOCPAP (providing positive pressure output to the patient. When the airway resistance of the patient increases and affects normal breathing, the ventilator automatically increases Output pressure until the patient is breathing normally; when the patient is breathing normally, the ventilator will reduce the output pressure to the lower limit pressure to maintain the patient's normal breathing), Bi-Level CPAP (pro...

AI Technical Summary

Problems solved by technology

It can be said that the use of airway sound absorption and sound insulation is a contradiction with controlling the increase in airway resistance. The airway resistance factor limits the means of using the airway in the machine to silence the ventilator.

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