| 摘要 |
A solar powered liquid metering device is disclosed including a solar chamber sealed from atmospheric pressure and partialy filled with a liquid to be metered. Trapped within the device above the liquid is an expansible gas. Also included is an overflow chamber partially filled with the liquid and coupled to the solar chamber to allow fluid communication between the two bodies of liquid. An overflow pipe has an end located within the overflow chamber. When the gas expands due to solar heating liquid is forced from the solar chamber into the overflow chamber and then out the overflow pipe. Various mechanisms are described to keep the liquid level within the overflow chamber no lower than the lip of the overflow pipe.
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