A respiratory ventilation apparatus configured to deliver a respiratory gas to a patient interface, comprising: a gas pressurization unit configured to generate a pressurized respiratory gas by pressurizing the respiratory gas, the gas pressurization unit being located in a main body of the respiratory ventilation apparatus; and a connecting piece configured to fix the gas pressurization unit to an internal space of the main body of the respiratory ventilation apparatus and/or damp vibration of the gas pressurization unit, wherein the connecting piece comprises: a connecting part configured to connect an outlet port of the gas pressurization unit and form a sealed connection between the connecting piece and the gas pressurization unit; and a fixing part configured to fix the connecting piece to the internal space of the main body of the respiratory ventilation apparatus and form a fastening connection between the connecting piece and the main body of the respiratory ventilation apparatus, characterized in that the connecting part has a tubular structure; a first end of the connecting part is fixed to the fixing part; and a second end of the connecting part is connected to the outlet port of the gas pressurization unit; and wherein the second end of the connecting part is an annular double-layer port including an inner layer and an outer layer; wherein the fixing part has a sheet structure and includes an aperture configured to allow the pressurized respiratory gas to pass; and the connecting part is capable of allowing the pressurized respiratory gas to pass through the tubular structure to the aperture of the fixing part. a gas pressurization unit configured to generate a pressurized respiratory gas by pressurizing the respiratory gas, the gas pressurization unit being located in a main body of the respiratory ventilation apparatus; and a connecting piece configured to fix the gas pressurization unit to an internal space of the main body of the respiratory ventilation apparatus and/or damp vibration of the gas pressurization unit, wherein the connecting piece comprises: a connecting part configured to connect an outlet port of the gas pressurization unit and form a sealed connection between the connecting piece and the gas pressurization unit; and a fixing part configured to fix the connecting piece to the internal space of the main body of the respiratory ventilation apparatus and form a fastening connection between the connecting piece and the main body of the respiratory ventilation apparatus, characterized in that the connecting part has a tubular structure; a first end of the connecting part is fixed to the fixing part; and a second end of the connecting part is connected to the outlet port of the gas pressurization unit; and wherein the second end of the connecting part is an annular double-layer port including an inner layer and an outer layer; wherein the fixing part has a sheet structure and includes an aperture configured to allow the pressurized respiratory gas to pass; and the connecting part is capable of allowing the pressurized respiratory gas to pass through the tubular structure to the aperture of the fixing part. a connecting part configured to connect an outlet port of the gas pressurization unit and form a sealed connection between the connecting piece and the gas pressurization unit; and a fixing part configured to fix the connecting piece to the internal space of the main body of the respiratory ventilation apparatus and form a fastening connection between the connecting piece and the main body of the respiratory ventilation apparatus, characterized in that the connecting part has a tubular structure; a first end of the connecting part is fixed to the fixing part; and a second end of the connecting part is connected to the outlet port of the gas pressurization unit; and wherein the second end of the connecting part is an annular double-layer port including an inner layer and an outer layer; wherein the fixing part has a sheet structure and includes an aperture configured to allow the pressurized respiratory gas to pass; and the connecting part is capable of allowing the pressurized respiratory gas to pass through the tubular structure to the aperture of the fixing part.