Multiple stage blowers and volutes therefor
AssigneeResMed Limited
InventorsGeoffrey Daniel Daly, Alexander Virr, Stephen Anthony Lea, Nicholas Jerome Reed
Life of this patent
Estimating the term…
Abstract
A multiple stage variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the multiple stage blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise.
Claims28
An enclosure for a blower configured to generate a positive pressure flow of gas, the enclosure comprising:
- a base defining a plurality of chambers;
- a lid that engages the base to enclose the plurality of chambers;
- and
- a seal sandwiched between the base and the lid so that the enclosure defines a substantially closed air path, the seal defining an outlet conduit adapted to direct pressurized gas out of the enclosure.
An enclosure for a blower configured to generate a positive pressure flow of gas, the enclosure comprising:
- a base with an interior wall dividing an interior space of the enclosure into a first chamber and a second chamber;
- a lid that engages the base to enclose the interior space;
- and
- a seal sandwiched between the base and the lid so as to define a substantially closed air path, the seal including an interior wall sandwiched between the lid and the interior wall of the base,
- wherein the seal defines an air path inlet into the enclosure and defines an air path outlet out of the enclosure.
An enclosure for a blower configured to generate a positive pressure flow of gas, the enclosure comprising:
- a base;
- a lid that engages the base to enclose an interior space that is divided into a blower chamber and a muffling chamber;
- and
- a seal sandwiched between the base and the lid so as to define a substantially closed air path,
- wherein the seal cooperates with the base and the lid to define the blower chamber and the muffling chamber, and
- wherein the seal defines an enclosure inlet and an enclosure outlet.
Dependencies are inferred from the claim text.