Blower with a gas pressurization system

A blower with a gas pressurization system, configured to pressurize gas to a range of 2 cmH2O to 40 cmH2O and deliver pressurized gas to an outlet of a respiratory device, comprising:

• a blower housing, configured to enclose an internal structure of the blower and form a gas passage for helical gas flow, the blower housing including a gas inlet and a gas outlet;
• an impeller, comprising a plurality of blades and at least one casing, wherein the at least one casing at least includes an upper casing and a lower casing, wherein the upper casing and the lower casing are configured to clamp the plurality of blades and form multiple impeller channels, wherein the impeller is configured to accelerate the gas flow entering the blower and guide the gas flow radially through the multiple impeller channels, and wherein the impeller has a planar bottom end;
• a brushless direct current motor, comprising a rotor assembly, a stator assembly, at least one permanent magnet, and bearings, the motor having a first end nearer the blower housing and a second end away from the blower housing, wherein the impeller is attached to the first end of the motor via the rotor assembly and is driven by the motor;
• wherein the impeller is positioned on a same side of the motor as the gas inlet,
• one side of the gas inlet is provided in external environment, and the other side of the gas inlet is provided above the impeller,
• wherein the gas passage is divided by the impeller into a first region above the impeller and a second region below the impeller, a space in the second region being larger than or equal to a space in the first region, and
• wherein at least 50% of the gas outlet is configured to be located in the second region.

A blower with a gas pressurization system, configured to pressurize gas to a range of 2 cmH2O to 40 cmH2O and deliver pressurized gas to an outlet of a respiratory device, comprising:

• a blower housing, configured to enclose an internal structure of the blower and form a gas passage for helical gas flow, the blower housing including a gas inlet and a gas outlet;
• an impeller, comprising a plurality of blades and at least one casing, wherein the at least one casing at least includes an upper casing and a lower casing, wherein the upper casing and the lower casing are configured to clamp the plurality of blades and form multiple impeller channels, wherein the impeller is configured to accelerate the gas flow entering the blower and guide the gas flow radially through the multiple impeller channels;
• a brushless direct current motor, comprising a rotor assembly, a stator assembly, at least one permanent magnet, and bearings, the motor having a first end nearer the blower housing and a second end away from the blower housing, wherein the impeller is attached to the first end of the motor via the rotor assembly and is driven by the motor;
• wherein the impeller is positioned on a same side of the motor as the gas inlet,
• one side of the gas inlet is provided in an external environment, and the other side of the gas inlet is provided above the impeller,
• wherein an outer side surface of the blower housing is exposed to the external environment,
• wherein the lower casing includes a first sheet and a second sheet, the first sheet and the second sheet being coaxially aligned, the first sheet and the second sheet being vertically spaced apart, and a diameter of the second sheet being greater than a diameter of the first sheet;
• wherein the gas passage is divided by the impeller into a first region above the impeller and a second region below the impeller, wherein the first region and the second region are configured such that the gas flows through a gap formed between the second sheet and the blower housing, and
• wherein the gas flows at high velocity through the impeller channels in the first region and subsequently enters the second region where the gas flow is buffered.

A blower with a gas pressurization system, configured to pressurize gas to a range of 2 cmH2O to 40 cmH2O and deliver pressurized gas to an outlet of a respiratory device, comprising:

• a blower housing, configured to enclose an internal structure of the blower and form a gas passage for helical gas flow, the blower housing including a gas inlet and a gas outlet;
• an impeller, comprising a plurality of blades and at least one casing, configured to accelerate the gas flow entering the blower and guide the gas flow radially, the impeller having a planar bottom end;
• a brushless direct current motor, comprising a rotor assembly, a stator assembly, at least one permanent magnet, and bearings, the motor having a first end nearer the blower housing and a second end away from the blower housing, wherein the impeller is attached to the first end of the motor via the rotor assembly and is driven by the motor;
• wherein the impeller is positioned on a same side of the motor as the gas inlet,
• one side of the gas inlet is provided in an external environment, and the other side of the gas inlet is provided above the impeller,
• wherein an outer side surface of the blower housing is exposed to the external environment,
• wherein the stator assembly includes a stator assembly housing, an outer surface of the stator assembly housing being at least partially exposed to the gas passage and configured to allow convective cooling of the stator assembly during operation of the blower,
• wherein a non-integral tube is provided between the rotor assembly and the stator assembly,
• wherein the stator assembly includes a stator with a central hole and multiple coils arranged in a distributed winding configuration, the motor being a multiphase switched reluctance brushless direct current motor, the multiple coils comprising phase coil groups for the multiphase switched reluctance brushless direct current motor, the stator including multiple protruding stator teeth, and
• wherein the stator includes multiple laminations and insulating materials that wrap around the laminations.