Patent ID: 6974245
Filing Date: 2005-12-13
Classification: A01C,B01F,Y10T

Abstract:
1. Mixing device for a liquid fertilizer with a flow of irrigation water, that comprises a mixing head provided with an internal mixing chamber into which opens an internal channel for the supply of water, adapted to be connected to a source of distribution of water under pressure, an internal channel for the supply of liquid fertilizer connected by a supply circuit to a remote reservoir, and an internal channel for distribution of water with added liquid fertilizer that can be connected to a distribution element, said mixing chamber being arranged as a Venturi device such that the flow of water through the mixing chamber, from the water supply channel, toward the distribution channel, causes an effect of sucking the liquid fertilizer into the chamber for mixing the liquid fertilizer with the flow of water, wherein the mixing head is made of two parts, an upper part and a lower part, connected in sealed relation to each other, the internal water supply channel and liquid supply channel being arranged in the upper part whilst the mixing chamber and the internal channel for distribution of water are provided in the lower part, the mixing chamber having a conical shape, wherein the upper part of the head has a cylindrical fitting screw-threaded on at least a long portion and the lower part of the head has a screw-threaded recess in which is engaged by screwing the screw-threaded part of the cylindrical fitting of the upper part of the head, said recess being in communication with the mixing chamber, and said channels for liquid fertilizer supply and water supply open respectively into the flat end surface of the cylindrical fitting and the flat end surface of truncated conical projection projecting downwardly, wherein the upper part of the head in axial prolongation of the cylindrical fitting is provided with a cylindrical shoulder, and wherein a support has a through bore in which is engaged with functional play the cylindrical fitting of the upper part and the thickness of the support about the through bore is less than the interval remaining between the shoulder of the upper part and the flat surface about the recess of the lower part after total engagement of the screw-threaded fitting in the screw-threaded recess, said shoulder and said flat surface about the flat surface constituting abutments to the axial movement of the support along the cylindrical fitting.