Adaptive auxiliary air supply respirator and control method thereof

A control method of an adaptive auxiliary air supply respirator, wherein the adaptive auxiliary air supply respirator comprises:

• a sealing face shield covering at least the area of the mouth and nose, an internal chamber being formed within the sealing face shield;
• an exhalation valve connected to the sealing face shield, communicating with the internal chamber, and configured to open unidirectionally during exhalation, allowing gas from the internal chamber to be discharged through the exhalation valve;
• an intake chamber located inside the sealing face shield and equipped with an inhalation valve which opens unidirectionally during inhalation, allowing gas in the intake chamber to enter the internal chamber from the inhalation valve;
• a filter mounted on the sealing face shield and communicating with the intake chamber;
• and
• an auxiliary air supply mechanism comprising a fan extending into the intake chamber, a controller for controlling a speed of the fan, and a sensor arranged inside the sealing face shield;
• the fan is configured to transfer external air into the intake chamber;
• when the sensor detects inhalation, the controller increases the speed of the fan;
• when the sensor detects exhalation, the controller decreases the speed of the fan;
• the exhalation valve is positioned at a bottom of the sealing face shield and provided with a first valve flap inside which opens when the pressure exceeds a set value;
• the intake chamber is arranged in the middle of the sealing face shield, with a guiding surface on an outer wall of the intake chamber directed towards the exhalation valve, and the guiding surface directs exhaled gas towards the exhalation valve, thereby increasing the amount of waste gas expelled and reducing safety risks associated with elevated CO2 levels in the waste gas;
• the control method comprises the following steps:
• collecting values from the pressure sensor within the internal chamber;
• when a pressure value monitored by the pressure sensor is less than a set threshold range, controlling, by the controller, the fan to accelerate to maintain the pressure in the internal chamber within the set threshold range;
• when the pressure value monitored by the pressure sensor is greater than the set threshold range, controlling, by the controller, the fan to decelerate to lower the pressure in the internal chamber to within the set threshold range;
• and
• synchronously recording the frequency of changes in the pressure sensor;
• by recording the frequency of pressure changes, the respiratory rate of a user is determined;
• the system sets a frequency value equal to the respiratory rate of the user and adjusts the speed of the fan according to the frequency value;
• when a difference in the detected frequency change falls within a set range, the system enters a synchronized air supply mode, which comprises setting a simulated frequency and controlling the fan to accelerate and decelerate in turn at the simulated frequency;
• when the difference in the detected frequency change exceeds the set range, the system exits the synchronized air supply mode;
• the intake chamber comprises a front chamber and a rear chamber, with the fan located inside the rear chamber, the rear chamber features an annular tapered wall protruding towards the front chamber, blades of the fan are positioned within the annular tapered wall, and the annular tapered wall communicates with the front chamber;
• the filter comprises a filtering plate located outside the sealing face shield and a communication tube communicating with the filtering plate and the front chamber;
• and
• the inhalation valve is arranged at a top of the rear chamber and comprises a second valve flap with the center fixed and edges free;
• a height of the second valve flap corresponds to an inhalation area where the nostrils of the user are located, and the guiding surface directs exhaled gas towards the exhalation valve.