| 摘要 |
A vacuum cleaner has a vacuum pump with a housing including a lobed chamber having an epitrochoidal planform satisfying the equationx=(a+b)xcos (t)-cxcos ((a/b+1)xt),andy=(a+b)xsin (t)-cxsin ((a/b+1)xt),where 0</=t</=2 pi , a/b=2 (thus defining the number of lobes in the chamber) and b/c=2. The chamber has outlet ports and inlet ports in each lobe of the chamber, and a central stator gear with 2n teeth. A triangular rotor with curved sides is disposed for eccentric rotation in the chamber such that an inlet port and outlet port in each lobe of the chamber are always in direct fluid communication during a portion of the rotor travel, which prevents excessive pressure build-up at the chamber inlet ports, and a central rotor gear with 3n teeth meshed with the stator gear. A drive disc fits within a circular opening in the rotor and is mounted eccentrically to a drive shaft driven by a motor to impart rotational motion to the rotor to generate air flow from the inlet ports to the outlet ports of the chamber. A ducting system connects the inlet ports of the chamber to a debris-collecting compartment. The vacuum cleaner supplies adequate cleaning power at lower rotational speeds and at lower air flow velocities, thus providing significant noise reduction.
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