Noise-reducing gas passage device with a resonant chamber

A noise-reducing gas passage device comprising a resonant chamber, configured to generate pressurized gas and continuously deliver it to a patient's respiratory tract, the noise-reducing gas passage device comprising:

• a casing, configured to include at least three chambers comprising at least one resonant chamber, an air intake, and an air outlet, wherein the air intake is configured to receive gas and the air outlet is configured to exhaust the pressurized gas;
• and
• the at least one resonant chamber is empty, including walls surrounding the at least one resonant chamber, wherein at least one wall of the at least one resonant chamber includes at least one opening configured to be in communication with other chambers of the at least three chambers other than the at least one resonant chamber;
• wherein, the communication between the at least one resonant chamber and the other chambers other than the at least one resonant chamber is formed by a neck, the neck including a first end part connectable to the at least one opening of the at least one resonant chamber and a second end part connectable to the other chambers other than the at least one resonant chamber;
• wherein airflow entering the neck is no more than 20% of airflow entering the air intake of the casing;
• and
• wherein, from top to bottom, the noise-reducing gas passage device sequentially comprises a first chamber of the at least three chambers, a second chamber of the at least three chambers, and the resonant chamber of the at least three chambers.

A noise-reducing gas passage device comprising a resonant chamber, configured to generate pressurized gas and continuously deliver it to a patient's respiratory tract, the noise-reducing gas passage device comprising:

• a casing, configured to include at least two chambers comprising at least one resonant chamber, an air intake, and an air outlet, wherein the air intake is configured to receive gas and the air outlet is configured to exhaust the pressurized gas;
• and
• the at least one resonant chamber is empty, including walls surrounding the at least one resonant chamber, wherein at least one wall of the at least one resonant chamber includes at least one opening configured to be in communication with other chambers of the at least two chambers other than the at least one resonant chamber;
• wherein, the communication between the at least one resonant chamber and the other chambers other than the at least one resonant chamber is formed by a neck, the neck including a first end part connectable to the at least one opening of the at least one resonant chamber and a second end part connectable to the other chambers other than the at least one resonant chamber;
• wherein, an airflow within the other chambers other than the at least one resonant chamber forms a main airflow path, and an angle between a tangent of the main airflow path at the second end part and a central line of the neck is equal to or greater than 30°;
• wherein, from top to bottom, the noise-reducing gas passage device sequentially comprises a first chamber of the at least two chambers and a second chamber of the at least two chambers;
• and
• wherein the first chamber is configured to accommodate a blower.

A noise-reducing gas passage device comprising a resonant chamber, configured to generate pressurized gas and continuously deliver it to a patient's respiratory tract, the noise-reducing gas passage device comprising:

• a casing, configured to include at least two chambers comprising at least one resonant chamber, an air intake, and an air outlet, wherein the air intake is configured to receive gas and the air outlet is configured to exhaust the pressurized gas;
• and
• the at least one resonant chamber is empty, including walls surrounding the at least one resonant chamber, wherein only one of the walls of the at least one resonant chamber includes at least one opening configured to be in communication with other chambers of the at least two chambers other than the at least one resonant chamber;
• wherein, the communication between the at least one resonant chamber and the other chambers other than the at least one resonant chamber is formed by a neck, the neck including a first end part connectable to the at least one opening of the at least one resonant chamber and a second end part connectable to the other chambers other than the at least one resonant chamber;
• wherein, from top to bottom, the noise-reducing gas passage device sequentially comprises a first chamber of the at least two chambers and a second chamber of the at least two chambers,
• wherein the first chamber is configured to accommodate a blower, and
• wherein the at least one resonant chamber abuts the air intake and/or is provided opposite an inlet of the blower.