Double-ended blower and volutes therefor
5 Assignments
0 Petitions
Accused Products
Abstract
A double-ended 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 double-ended 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.
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Citations
40 Claims
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1-12. -12. (canceled)
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13. A double-ended blower comprising:
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a motor supporting opposed first and second shaft ends;
a first impeller provided to the first shaft end, the first impeller having a first air intake;
a second impeller provided to the second shaft end, the second impeller having a second air intake; and
a casing to support the motor and to at least partially define a channel adjacent to the motor to guide gas along an air path from the first impeller to the second impeller, wherein the channel is constructed and arranged so that at least part of the flow path is helical. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A double-ended blower comprising:
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a motor supporting opposed first and second shaft ends;
a first impeller provided to the first shaft end, the first impeller having a first air intake;
a second impeller provided to the second shaft end, the second impeller having a second air intake; and
a casing to support the motor and to at least partially define an air path from the first impeller to the second impeller, wherein the air path includes a first path portion adjacent the first impeller with a spiral component, a second path portion between the first and second impellers with a helical component, and a third path portion adjacent the second impeller with a spiral component and a radial component. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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Specification