| 摘要 |
An electrically driven air pump has a housing, in which an electric motor and a pump mechanism are arranged, the pump mechanism having at least one impeller with a multiple number of impeller channels. The housing has an annular channel, which connects to a discharge member. The annular channel is closed to the impeller channels by a cam disk which has a recess in its periphery to provide a defined opening for smooth passage of air from the impeller channels to the annular channel.
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