Flow generator
A flow generator includes a housing, a blower structured to generate a flow of pressurized breathable air, and a suspension device to support the blower within the housing and provide a pressure seal between low and high pressure sides of the blower. The suspension device includes a bellows-like portion provided along the perimeter of the blower to absorb shock applied at least radially to the blower and one or more cones provided along upper and/or lower sides of the blower to absorb shock applied at least axially to the blower.
1. A flow generator for generating a flow of pressurized breathable air to be delivered to a patient for respiratory therapy, the flow generator comprising:
a housing including an air flow inlet, an air flow outlet, and an air flow path from the air flow inlet to the air flow outlet;
a blower structured to generate the flow of pressurized breathable air to be provided to the air flow path, the blower including an inlet along an inlet side thereof and an outlet along an outlet side thereof; and
a suspension device to support the blower within the housing and provide a pressure seal between the inlet and outlet sides of the blower,
wherein the suspension device surrounds the blower to enclose or encase the blower, and the suspension device includes opposing suspension walls with respective suspension apertures to accommodate the inlet and the outlet of the blower,
wherein the inlet and the outlet of the blower and respective suspension apertures of the suspension device are coaxial with one another, and
wherein the suspension device includes a bellows portion extending radially outwardly from the opposing suspension walls and arranged along a perimeter of the blower to absorb shock applied at least radially to the blower, and the suspension device further includes one or more cones provided to each of the opposing suspension walls and arranged along respective inlet and outlet sides of the blower to absorb shock applied at least axially to the blower.
2. A flow generator according to claim 1 , wherein the suspension device is constructed of an elastomeric material.
3. A flow generator according to claim 1 , wherein the suspension device includes an exterior shape that corresponds to an exterior shape of the blower.
4. A flow generator according to claim 3 , wherein the suspension device includes a cylindrical shape.
5. A flow generator according to claim 1 , wherein the suspension device includes an annular support member extending radially outwardly from the opposing suspension walls.
6. A flow generator according to claim 5 , wherein the annular support member includes the bellows portion and an end portion supported by the housing.
7. A flow generator according to claim 1 , wherein said one or more cones provided to each of the opposing suspension walls comprises a plurality of said cones that are arranged in a circle.
8. A flow generator according to claim 1 , wherein the housing includes a blower chamber to retain the blower and suspension device within the housing.
9. A flow generator according to claim 8 , wherein the blower chamber includes at least one opening to allow air to enter the blower on the inlet side thereof and at least one aperture to allow the flow of pressurized breathable air generated by the blower to exit the blower chamber on the outlet side thereof.
10. A flow generator according claim 1 , wherein the housing is structured to receive and support a printed circuit board (PCB) outside the air flow path.
11. A flow generator according to claim 1 , wherein the air flow inlet and the air flow outlet of the housing are provided on opposite sides of the housing.
12. A flow generator according to claim 11 , further comprising an air filter provided to the air flow inlet.
13. A flow generator according to claim 1 , wherein the housing includes one or more wall ribs along a perimeter of its side wall.
14. A flow generator according to claim 1 , further comprising a printed circuit board (PCB ) to control the blower, wherein the PCB is supported within the housing and includes a power lead wire for power that extends directly from the PCB to outside the housing.
15. A flow generator according to claim 1 , further comprising a printed circuit board (PCB) to control the blower, wherein the blower includes magnet wire directly connected to the PCB.
16. A flow generator according to claim 1 , further comprising one or more pieces of acoustic foam along the air flow path to direct air and provide sound absorption.
17. A flow generator according to claim 1 , wherein the air flow path provides one or more reflective surfaces along a length of the air flow path to reduce noise.
18. A flow generator according to claim 17 , wherein the housing includes one or more air flow vanes including the one or more reflective surfaces to provide a noise barrier for the blower and/or to reflect noise from the blower so as to prevent noise from being emitted back through the air flow inlet.
19. A flow generator according to claim 18 , wherein the one or more air flow vanes are provided adjacent the air flow inlet to direct incoming air flow from the air flow inlet.
20. A flow generator according to claim 1 , wherein the suspension device is configured to support the blower within the housing to allow operation of the flow generator in any orientation.
21. A flow generator according to claim 1 , wherein the suspension apertures provide clearances around the inlet and the outlet of the blower.
22. A flow generator according to claim 1 , wherein the one or more cones are structured and arranged to extend outwardly from respective suspension walls in a direction away from the blower.
23. A flow generator according to claim 1 , wherein the bellows portion includes one or more folds structured and arranged to allow the bellows portion to expand and contract to absorb shock.
24. A flow generator according to claim 1 , wherein the air flow outlet is adapted to connect to an air delivery tube for delivery of the flow of pressurized breathable air to a patient interface.
25. A flow generator according to claim 1 , further comprising an air filter provided to the air flow inlet of the housing to filter air drawn into the housing by the blower.
26. A flow generator according to claim 1 , wherein the blower includes a rotor and an impeller provided to the rotor, and wherein the inlet and the outlet of the blower and respective suspension apertures of the suspension device each include a central axis that is coaxial with an axis of the rotor.
27. A flow generator according to claim 1 , wherein the suspension device is configured to allow movement of the blower with respect to the housing in use and prevent contact of the blower with the housing in any orientation of the flow generator.