Sub-irrigation device with a hydraulic switch

A - Human Necessities – 01 – G

Patent

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Details

A01G 27/04 (2006.01)

Patent

CA 2372015

The invention relates to a capillary mattress which is specially designed for sub-irrigation of pot crops. The structure of said capillary mattress has a dry top surface and is therefore free from problems caused by colonies of algae and insects that are associated with existing capillary mattresses. The inventive mattress consists of three distinct layers. The first layer forms the top of the mattress. It is made of a thin polymer sheet (2) containing a multitude of little holes (3) upon which the pots are placed. The center layer is made up of a sheet of resilient foam (4) which has open cells and which can be compressed and enables water to flow easily therethrough. The bottom layer is made from a mass of absorbent matter (5) which can absorb water and ensure both a good division and distribution thereof. When used, the capillary mattress is placed or installed on a planar, approximately level, impermeable surface. A certain number of perforated water supply pipes run between the surface upon which the mattress rests and the latter. The water supply pipes emit water at different points along the length thereof and provide water to the mass of absorbent matter (5) of the mattress. Pots (6) containing crops are placed at any desired point on the top surface of the capillary mattress. The sheer mass of the pots compresses the foam and reduces the dimensions of the cells thereof, thereby bringing the polymer sheet which forms the top level of the mattress closer to the mass of absorbent matter forming the lower layer. The decrease in the dimension of the cells of the resilient foam forming the center layer facilitates capillary ascension of water between the bottom layer of the mattress which is full of water and the top layer.

Image L'invention vise un matelas capillaire (1) qui est spécialement conçu pour la sub-irrigation de culture en pots et qui, de par sa structure, présente une surface supérieure sèche et donc libre du problème de colonies d'algues et des insectes associés aux matelas capillaires existants. Ce matelas capillaire comprend trois couches distinctes. La première de celles-ci forme le dessus du matelas. Elle est constituée d'une mince feuille polymérique (2) traversée d'une multitude de petits trous (3), sur laquelle les pots sont posés. La couche centrale est construite d'une feuille de mousse résiliente (4) à cellules ouvertes et compressibles offrant un passage aisé à l'eau. La couche de dessous est constituée d'une masse de matière absorbante (5) capable d'absorber l'eau et assurer une bonne répartition et distribution de celle-ci. En usage, ce matelas capillaire est déposé ou autrement installé sur une surface plane approximativement de niveau et imperméable. Entre la surface sur laquelle le matelas repose et ce dernier, on fait courir un certain nombre de tuyaux d'alimentation en eau perforés. Ces tuyaux d'alimentation émettent de l'eau en différents points situés sur leurs longueurs et donc fournissent de l'eau à la masse de matière absorbante (5) du matelas. Sur la surface supérieure du matelas capillaire, on pose les pots (6) contenant les cultures en n'importe quel point désiré. La masse des pots comprime la mousse, diminuant ainsi la dimension de ses cellules et par le fait même rapprochant la feuille polymérique formant la couche de dessus de matelas de la masse de matière absorbante formant la couche inférieure. Cette diminution de la dimension des cellules de la mousse résiliente formant la couche centrale favorise l'ascension capillaire de l'eau entre la couche de dessous du matelas qui est gorgée d'eau, et la couche de dessus.

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