Breathing apparatus provided with a breath-synchronized motor fan

Abstract

An object of the present invention is to provide a breathing apparatus, wherein current for keeping internal pressure of the face piece at a predetermined positive target value at the time of inhale is not applied to the motor fan in a large amount at the start of current application to the motor fan, and the internal pressure of the face piece is prevented from becoming far below the predetermined positive target value immediately after start of current application to the motor fan so as to keep the internal pressure of the face piece at the predetermined positive target value at the time of inhale. A breathing apparatus provided with a breath-synchronized motor fan comprising a face piece for covering a part of or all of a face of a user, an inhale valve and an exhale valve attached to the face piece, a motor fan for supplying internal space of the face piece with external air through the inhale valve, a filter for cleaning the external air to be sucked into the motor fan, a breath monitoring apparatus provided with a membrane member deforming in accordance with fluctuation of internal pressure of the face piece and a sensor for detecting the deformation of the membrane member, and a controller for controlling operation of the motor fan synchronously with breathing of the user in accordance with a detection signal from the breath monitoring apparatus, wherein the controller applies current to the motor fan at the time of inhalation so as to keep the internal pressure of the face piece at a predetermined positive target value, and stops current application to the motor fan so as to stop the motor fan at the time of exhalation, and wherein the controller applies micro-current to the motor fan so as to rotate the motor fan at extremely low speed from the middle of exhalation to inhalation.