To provide a reliable air blower of which acoustic noise is low.
The double-ended variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in a gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. The blower consists of a gas flow path between a gas inlet and a gas outlet, a motor, an impeller assembly which includes a shaft in communication with the motor for conducting rotary motion around a first axis and first and second impellers fixed to be immobile for the axis. 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.
VIRR ALEXANDER
LEA STEPHEN ANTHONY
MARTIN DION CHARLES CHEWE
REED NICK
PUCKERIDGE LARRY
FU TIMOTHY TSUN-FAI
| JP2003214395A | 2003-07-30 |