SELF-REGULATING FLOW RATE DEVICE FOR IRRIGATION.

Abstract

L'objet de l'invention concerne un premier certificat d'addition apporté au brevet français Ndegré 87 03602 concernant un dispositif d'auto-régulation pour micro aspersion. Il est constitué par la combinaison d'abord, d'un corps creux (1) avec fond équipé d'un embout de raccordement amont destiné à l'arrivée du fluide, ensuite, d'un élément fileté (30) se vissant dans ledit corps, traversé par un perçage (11) parallèle à l'axe du filetage, mettant en communication l'intérieur du corps creux avec un embout de raccordement aval, la partie filetée étant terminée à l'opposé de l'embout par une surface plane parallèle au fond du corps creux et munie d'une rainure (33), dont la forme et la longueur sont déterminées par le débit désiré et reliant l'extrémité du perçage à un évidement situé à la périphérie de l'élément fileté, enfin, d'une membrane souple située entre le fond du corps creux et la surface plane de l'élément fileté. Il est destiné à assurer une parfaite régularité de débit d'un jet quelles que soient les différences de pression subies par le fluide, et a pour objet des modifications fonctionnelles permettant, d'une part d'utiliser le dispositif pour une plage de débits plus importante, toute en conservant une courbe de régulation très plane, d'autre part, de raccorder une conduite ou un réseau en aval du système auto-régulateur.

Description

SELF-REGULATING FLOW RATE DEVICE FOR IRRIGATION The object of the invention relates to a first certificate of addition to French patent NO 87 03602 concerning a self-regulation device for micro-spraying. It is designed to ensure perfect regularity of flow of a jet regardless of the pressure differences experienced by the fluid, and has as its purpose functional modifications allowing, on the one hand, the use of the device for a larger range of flow rates, while maintaining a very flat regulation curve, on the other hand, the connection of a pipe or network downstream of the self-regulating system. I1 consists of the combination, firstly, of a hollow body with a bottom equipped with an upstream connection nozzle for the arrival of the fluid, secondly, of a threaded element screwed into said body, through which is a bore parallel to the axis of the thread, connecting the inside of the hollow body with a downstream connection nozzle, the threaded part being terminated opposite the nozzle by a flat surface parallel to the bottom of the hollow body and provided with a groove, the shape and length of which are determined by the desired flow rate and connecting the end of the bore to a recess located at the periphery of the threaded element, finally, of a flexible membrane located between the bottom of the hollow body and the flat surface of the threaded element. The attached drawings are given as a non-limiting example of one of the forms of the invention: Figure 1 shows the assembled device. Figure 2 shows the different elements separated. Figure 3 is a cross-section of figure 1 passing through the axis of the threaded element and parallel to the plane of the figure. Figure 4 is a bottom view of the threaded element, following arrow F in Figure 2. Figures 5 and 6 are enlarged sections, following the arrows EE in Figure 4, showing two different shapes of grooves. The device, figure 1 to 6, consists of a hollow body 1 with upstream connection tip 2 into which a threaded element 30 is screwed, trapping a flexible membrane 5 at the bottom of the hollow body 1. The threaded element 30 replaces the superstructure with divider-deflector of the original patent. A bore 11, parallel to the thread axis but eccentric, passes through it, connecting the interior of the hollow body 1 with a downstream connecting end 31. Opposite the end 31, the threaded portion has a flat surface 32 perpendicular to its axis and parallel to the bottom of the hollow body 1. A groove 33 is formed approximately in the center of this flat surface and connects the end of the bore 11 to a recess 34 located at the periphery of the threaded element 30. The shape of the section, as well as the length of the groove 33, are determined according to the flow rate. For example, for flow rates below 10 liters per hour, intended for drip irrigation, the groove is V-shaped (Figure 5), and values ​​close to those below give the best results: - Flow rate in liters / hour: 2, 4, 8 - Angle A of the 'V': 60°, 50°, 55° - Depth H: 0.30 mm, 0.45 mm, 0.60 µm - Length: 4 mm, 4 mm, 1 mm For flow rates exceeding 10 liters per hour, intended for micro-jet irrigation, the groove is a more closed 'V' shape with flared upper edges over a height Hb at an angle B (Figure 6) to obtain a sufficiently flat regulation curve: - Flow rate in liters / hour: 20 30 40 - Angle A: 40 50 40 - Depth H: l, lmm 1.3mm 2, lmm - Angles B with flared edges: 50 90 60 - Height Hb with flared edges: 0.7mm 0.9mm 1.3mm - Length: 8mm 8mm 8mm The other elements described on the original patent, such as hollow body 1 and flexible membrane 5, being unchanged.

Claims

DEMANDS 10 Self-regulating flow device for watering intended for the irrigation of cultivated land, having as its object the regulation of the emission of the fluid as a result of pressure variations according to claims 1 and 3 of French patent NO 87 03602 concerning a self-regulating device for micro-sprinkling, characterized by a threaded element (30) screwed into the hollow body (1), through which is a hole (11) parallel to the thread axis, connecting the interior of the hollow body (1) with a downstream connection nozzle (31), the threaded part being terminated opposite said downstream connection nozzle by a flat surface (32) parallel to the bottom of the hollow body (1) provided with a groove (33), the shape and length of which are determined by the desired flow rate and connecting the end of the hole (11) to a recess (34) located at the periphery of the threaded element (; 20. Device according to claim 1, characterized in that, for flow rates less than 10 liters per hour, intended for drip irrigation, the groove (33) is V-shaped (Figure 5) and its dimensions are close to those shown in the table below - Flow rate in liters / hour: 2 4 8 - Angle of the 'V' (A): 60° 50° 55° - Angle of the 'V' (A): 60° 50° 55° - Depth (H): 0.30 mm 0.45 mm 0.60 mm - Groove length: 4 mm 4 mm L mm 30. Device according to claim 1, characterized in that, for flow rates exceeding 10 liters per hour, intended for micro-jet irrigation, the groove (33) is V-shaped (angle A, Figure 6) with flared upper edges forming a wider angle (angle B, Figure 6) and its dimensions are close to those shown in the table below - Flow rate in liters / hour: 20 30 40 - Angle of 'V' (A): 40° 50° 40° - Depth (H): 1.1 mm 1.3 mm 2.1 mm - Angles of flared edges (B): 5° 9° 6° - Height of flared edges (Hb): 0.7 mm 0.9 mm 1.3 mm - Groove length: 8 mm 8 mm 8 mm