PROBLEM TO BE SOLVED: To provide an automatic water supply device for a plant cultivation container, having a simple structure utilizing buoyant force, highly reliable, retaining most suitable condition also for plants, and to provide an automatic water supply system where the automatic water supply device for a plant cultivation container is incorporated, and an automatic-water-supply plant cultivation device.SOLUTION: The automatic water supply device for a plant cultivation container has the following structure: a float is stored in a float storing part while holding one end of the float the float storing part is provided with a conduit opening introducing water to the float storing part, and a water supply port supplying water to the plant cultivation container from the float storing part so as to be positioned lower than the height of the conduit opening a float pressure water-stop valve is provided at a side of the float nearer than a holding part of the float the float pressure water-stop valve is arranged so as to close the conduit opening via floating pressure of the float when the water surface of the inside of the float storing part raised higher than a predetermined height. The automatic water supply device is connected to a plurality of flower pots via pipe arrangement to be systematized or incorporated in the plant cultivation container together with the flower pots.COPYRIGHT: (C)2005,JPO&NCIPI【課題】浮力を利用した簡単な構造で信頼性が高く、植物にとっても最適な状態を保つことができる植物栽培容器への自動給水装置及びこの自動給水装置を組み込んだ自動給水システム・自動給水植物栽培装置の提供を目的とする。【解決手段】浮き収納部に、浮きの一端を支持して収納し、前記浮き収納部に、この浮き収納部に導水する導水口と、この浮き収納部から植物栽培容器に給水する給水口を前記導水口の高さより低くなるように備え、浮きの支持部より浮き側に浮圧止水弁を備え、浮き収納部内の水面が所定高さ以上になると浮きの浮圧にて前記導水口を塞ぐように浮圧止水弁を配設した。この自動給水装置を複数の植木鉢に配管接続してシステム化したり、植物栽培容器内に植木鉢と共に組み込むことが出来る。【選択図】 図1
