| 摘要 |
1312605 Aquaria METAFRAME CORP 19 April 1971 [18 March 1970] 23597/71 Heading A1A [Also in Division Fl] An aerating device 40, particularly for aquaria, comprises a conduit 58 through which liquid flows to entrain air from a chamber 48, the air liquid mixture passing through a discharge chamber 52, the air entering through a filter 88. The amount of air is regulated by a needle valve 90. Although the device 40 is shown as being formed by two co-operating housings 44, 46, a single moulding may be used. In an aquarium 10, water 36 flows through, a siphon tube (not shown) to a filter receptacle 14, an apertured platform (not shown) at the bottom of the receptacle 14 and through an electrically driven centrifugal pump 24 and pipe 28 to the device 40. The receptacle 14 is hooked to a rim 18 of the aquarium tank by a flange 16.
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