MXPA00003501A - An improved irrigation emitter unit - Google Patents

Abstract

An emitter unit to be integrally bonded to an internal surface of a conduit and comprising an elongated housing, a housing (1) inlet (13) adapted to communicate with an interior of said conduit and a housing outlet (26) adapted to communicate with a conduit outlet. An elongated, flow-restricting flowpath (11) is formed in the housing having a flowpath inlet (11a) communicating with the housing inlet (13) and a flowpath outlet (11b) communicating with the housing outlet (26). A resiliently flexible membrane (4) is mounted in the housing which is of closed box-like shape and is constituted by an elongated receiving member (2) and a correspondingly elongated cover member (3). Projection and recess interengaging means (9a, 9b) are formed along the lengths of elongated rim portions (8a, 8b) of the members (2, 3) and are directed substantially transversely to longitudinal axes of said members (2, 3) such that projection means (9b) of one member are adapted to form a close pressure fit within corresponding recess means (9a) of the other member.

Description

IMPROVED IRRIGATION ISSUING UNIT FIELD OF THE INVENTION This invention relates to an improved irrigation emitting unit for use in a drip irrigation system. The invention is applicable specifically to such systems wherein the emitting units are integrally connected at spaced intervals to the inner surface of a conduit adjacent to the outlet openings in the conduit, so that an irrigation flow through the conduit results in a drip rate irrigation output from the individual emitting units via the outputs.

BACKGROUND OF THE INVENTION Such drip irrigation systems, and in particular, the emitting units for use with the present, have been known for some time. They involve the provision in the emitter of an elongated flow restriction flow path through which water passes from the conduit so that it emerges from the outlet of the conduit as a drop substantially without pressure.

REF .: 33170 The construction and provision of these flow restrictor flow paths in general fall into two main categories, specifically: a) where the flow path is completely defined within the emitter housing; and b) wherein the flow path is defined between the emitter housing and the surface of the conduit in which the housing is attached.

The present invention relates specifically to the first of these categories, that is, when the flow path is defined within the housing. Further, the invention preferably relates to such a transmitter unit which is provided with a flow control means, for example, a differential pressure control means designed to ensure that the output speed of the emitter is substantially independent of variations in the Irrigation supply flow pressure to the emitting unit. Such a drip irrigation system and, in particular, the irrigation emitting units for use herein, have been described in our U.S. patent. above No. 4,210,287 (hereinafter "the patent? 287"). The patent 287 discloses a emitting unit that is provided with a resiliently flexible membrane which is releasably retained within a body member so that it serves a dual function, on the one hand, although it is exposed to an irrigation flow pressure in the conduit for operating by exerting differential pressure control and, on the other hand, for defining, with respect to a flow restriction groove formed in the body member, a flow restriction flow path. There have been several previous proposals to enclose the issuing unit in a housing. These proposals have not included adequate solutions, if any, regarding the problems that arise when considering the possible assembly of the constituent elements of the accommodation. Particular problems arise clearly when, as in the case of the emitting units that are the subject of the present invention, elongated and relatively long emitting units are required and means for the retention of the constituent parts in a container before their union must be provided. to the duct, especially when the container is formed of a relatively pliable plastic material (e.g. polyethylene) so as to facilitate its simple attachment to the duct. Therefore, an object of the present invention is to provide a new and improved irrigation emitting unit for use in drip irrigation systems, where the requirement referred to above is substantially obtained.

BRIEF DESCRIPTION OF THE INVENTION In accordance with the present invention, there is provided an emitter unit adapted to be integrally connected to an internal surface of a conduit, comprising an elongate housing, a housing inlet adapted to communicate with the interior of the conduit; a housing outlet adapted to communicate with a conduit outlet; an elongate flow restriction flow path formed in the housing; a flow path entry communicating with the housing entrance; a flow path output communicating with the outputs of the housing; a resiliently flexible membrane mounted on the housing, the housing is of a closed box-like shape and is constituted by an elongated receiving member and a corresponding elongated cover member; and projecting and recess interengaging means formed along the lengths of the elongated flange portions of the members and directed substantially transverse to the longitudinal axes of the members so that the projecting means of a member is adapted to forming a closure that is placed by pressure within the corresponding recess medium of the other member. The pressing together of the intercoupling means located along the lengths of the flanges of the constituent members of the housing ensures an effective retention of these members after their assembly and effectively prevents their separation before joining the housing to the conduit. This is of particular importance when considering that, on the one hand, the emitting units must be stored after assembly and consequently subjected to mechanical handling during the joining procedure and, on the other hand, that the enclosed membrane must be retained in the low housing some degree of resilient pressure. By virtue of the possibility of providing relatively elongated emitting units of safe box-like construction, according to the present invention, it is possible to obtain certain additional advantages among which may be mentioned: (i) the provision of a plurality of flow paths of restricting flow that are interconnected superimposed, separated respectively by the membrane or additional membranes; (ii) the incorporation into the emitting unit of a valve structure without effective return; and (iii) the provision of extended filtering arrangements.

Preferably, the emitter unit is provided with a differential pressure control means in which case a recess having dimensions extending substantially as compared to the width of the flow path, with a recess outlet which is formed in the housing, is formed in the housing. form in a recess base, a ridge of the recess having an area substantially greater than the area of the recess outlet, a first surface of the membrane that is adapted to be exposed to fluid inlet flow pressure; a second opposing surface of the membrane is juxtaposed to the reinforcement and adapted to be pressed against the flange under the inlet flow pressure; and in this way an exit control camera is defined with the recess; the arrangement is such that when the fluid inlet pressure exceeds the fluid pressure in the outlet control chamber by a predetermined amount, the membrane is bent towards the outlet recess so that it is defined with the outlet recess a restricted trajectory of outflow.

Therefore, it is preferably formed during a relatively simple molding of the constituent members of the housing, elongated slots that restrict the proper flow, together with the recesses of the outlet control chamber, these slots and recesses, together with the interposed membrane, define the flow paths that restrict the flow and the output control chamber. By virtue of the provision of the box-like housing, it is possible to provide, in the housing according to one aspect of the present invention, one or more elongated inflow channels which are preferably located adjacent one or both elongated edges of one of the constituent members of the accommodation. These channels communicate with the entrance of the housing and are exposed to the interior of the conduit. These channels, which are also formed during the molding of one or other of the constituent members of the housing, are partially covered, whereby provision is made for a relatively restricted type of filtering input within the channels and at the same time it is possible to provide channels that are dimensioned relatively broadly. The channels are provided with an array of filter baffles that are located along the length thereof. In this way, the irrigation flow passes into the emitting unit, together with one or more open and extended inflow channels that are provided with the filtering medium, and in this way the inflow channel itself can be of relatively large dimensions, so that blocking damage is again prevented.

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the present invention and to demonstrate how the same can be carried out in practice, reference will now be made to the accompanying drawings, in which: Figure 1 is an exploded perspective view of a mode of a sending unit according to the present invention; Figure 2 is an exploded perspective view of the emitting unit according to the present invention, shown in a reverse direction with respect to the view shown in Figure 1; Figure 3 is a perspective view of the assembled emitter unit, according to the present invention; Figure 4 is a perspective view (inverted with respect to the view shown in Figure 3) of the emitter unit according to the invention, shown partially cut away; Figure 5 is a longitudinal sectional view of a drip irrigation system incorporating the emitting unit according to the present invention, in an initial operation stage; Figure 6 is a longitudinal sectional view of the drip irrigation system incorporating the emitting unit according to the present invention, in a subsequent operation step; and Figure 7 is a cross-sectional view of the drip irrigation system shown in Figure 5, taken along line VII-VII.

DETAILED DESCRIPTION OF A PREFERRED MODALITY As seen in the drawings, the emitting unit according to the invention comprises an elongated housing 1 (see Figure 3) which has an essentially rectangular shape, similar to a box, and has rounded ends. The housing 1 is constituted by an elongated receiving member 2, correspondingly shaped, and a correspondingly shaped elongated cover member 3, and a resiliently flexible, elongated and correspondingly shaped membrane 4.

As seen in Figures 1 and 2 of the drawings, the receiving member 2 consists essentially of a substantially flat base wall 6 and a peripheral wall 7. The peripheral side wall 7 is formed with a pair of portions 8a of rectilinear elongated side flange and a pair of positions 8b of curved end flange. Formed in each portion 8a of the elongated side flange is an arrangement of recesses 9a and projections 9 formed in the form of alternating dovetails. The projections 9b themselves are recessed, thereby imparting resilient flexibility to the definition walls of the projections 9b. Formed on the inner surface of the base wall 6 of the receiving member 2 is an elongated slot 11 which extends from the portion 11a of the entrance end (of relatively extended width) to an intermediate terminal portion 11b via a restriction portion 11c of flow that is formed in a known manner with a pair of sets directed in an opposite manner of substantially triangular deflectors 12 restricting flow. An inlet well 13 is formed in the inlet portion Ia, defined by a tapered wall portion 14 having a peripheral well flange 16. This flange 16, as can be clearly seen in figures 5 and 6 of the drawings, extends from the inner surface of the base wall 6 beyond the deflectors 12. With reference now to figures 2, 4 and 7 of the drawings, On the outer surface of the base wall 6 of the receiving member 2, respectively adjacent to the elongated edges thereof, are formed a pair of elongated inflow channels 17a and 17b, having respective arrangements of baffles 18a and 18b of filters located along their lengths. Formed in the base wall 6 of the receiving member 2 is a transversely directed coupling channel 19 which serves to carry out communication between the elongated inlet flow channels 17a and 17b. The coupling channel 19 communicates via a central opening 19a with the well 13. Therefore, the elongated inflow channels 17a and 17b lack the coupling channel 19 within the central opening 19a and therefore constitute the only source of inflow to the interior of the emitting unit. A narrow molding slot 21 is formed transversely directed on the upper surface of the base wall 6 of the receiving member 2 and communicates along its length with the coupling channel 19. As can be seen, particularly in Figures 4 and 7 of the drawings, the elongated inflow channels 17a and 17b (which can be formed during the molding of the receiver member 2) are formed with a partial cover 17c. In this way, the provision of a relatively restricted filtering type input is facilitated within the channels 17a, 17b and, at the same time, the provision of relatively large-sized channels 17a, 17b is allowed. The cover member 3 is formed with portions 22a of elongated rectilinear side flange and curved end flange portions 22b. Formed along the length of each portion 22a of elongated lateral flange is an arrangement of alternating projections 23a and recesses 23b of cross-sectional shape of dovetail. Each recess 23b is formed, projecting from its base, a semi-cylindrical rod 23c. The projections and recesses 23a and 23b correspond in shape and dimensions to the recesses and projections 9a and 9b so that the projections 23a, 9b are able to be placed by pressure and firmly retained within the recesses 23b, 9a. The provision of the projection 9b recessed on both sides of the defining walls of the recess 9a allows the relative flexibility of these walls before the insertion of the projections 23a therein. The rods 23c effectively retain the recesses formed in the projections 9b.

Formed on the inner surface of the cover member 3 is an elongated slot 24 corresponding in shape and dimensions to the groove 11. In this case, the groove is formed with an end portion downstream of extended dimensions and which constitutes a recess 24a in the which corresponds in size and dimensions with the input portion Ia formed in the receiving member 2. The slot 24 is further formed with an intermediate entry portion 24b corresponding in shape and dimensions to the intermediate terminal portion 11b of the slot formed in the receiving member 2. Finally, the slot 24 comprises an elongated flow restriction portion 24c which corresponds in shape and dimensions to the flow restriction groove portion 11c formed in the receiving member 2, and like the restriction groove portion of the receiving member 2. flow, is formed with flow restriction deflectors 25. Formed at the base of the recess 24a is a recess outlet 26 which extends through the cover member 3. A narrow blind slot 27 is formed in the base wall of the recess 24a and communicates with the outlet 26 of the recess. The elongated flexible resilient membrane 4 corresponds in size and dimensions to the inner surface of the receiving member 2 and is formed with a communicating opening 28 designed in the assembled emitting unit, as can be clearly seen in Figures 5, 6 and 7 of the drawings, to be placed between the intermediate terminal portion 11b of the slot 11 and the intermediate entry portion 24b of the slot 24 in the cover member 3. The assembly of the emitting unit 1 is carried out by inserting the membrane 4 into the receiving member 2 and by pressing the covering member 3 into the receiving member 2, whereby the projections 23a and 9b are firmly placed and flexional, and are retained within recess 9a and 23b. As can be seen in figure 6 of the drawings, when assembled, the membrane 4 is pressed in a deviated manner against the flange 16 of the peripheral well, so that it effectively seals the emitting unit against the return flow or leaks from the exit 26 at the entrance of the emitter 19, 19a. In this way, the emitter is formed with a structure of valves without effective return. The opening of the valve so as to allow the flow of water within the emitter via the inlets 19, 19a is only possible when the inlet flow pressure is sufficient to move the membrane 4 away from the well flange 16. The emitter unit 1 assembled in this manner can subsequently be stored for insertion and subsequent joining to a conduit during the exclusion thereof, for example in accordance with the process as described and illustrated in our prior U.S. 5,324,371.

The means used to secure the cover member 3 within the receiving member 2, whereby the extended surfaces of the projections 23a, 9b ensure that the recess 9a, 23b is in frictionally pressed contact, which makes the disassembly of the device extremely unlikely. the units during storage and during the insertion and joining processes. It will be noted that in the embodiment just described, each projection interengagement means 23a, 9b is in its narrowest portion adjacent to the portion 22a, 8a of the flange of members 3, 2, from which it extends and extends. respectively outward, towards the flange portions 8a, 22a of the other members 2, 3 while each recess interengaging means 9a, 23b is at its widest portion adjacent the flange portion 8a, 22a of the members 2, 3 'in which they form and narrows downwards, towards the flange portion 22a, 8a of the other member 3, 2. Under this construction, and the fact that both projections and the recesses extend normally to the axes longitudinal members 2 and 3, the members are effectively secured against possible separation forces directed transversely to the longitudinal axes. further, the extended surfaces of the projections on the one hand, and the recesses on the other, ensure an effective frictional retention of the projections within the recesses against the outward displacement of the members 2, 3 with respect to each other. Although in the specific example illustrated and described the projections 23a and the recesses 9a show as essentially in the form of a dovetail, other essentially equivalent forms can also be used. Thus, for example, projections and recesses in the form of O can be used. In addition, in some cases an adequate retention can be assured with a single pair of projections and recesses of interengagement, as well as with projections and recesses of essentially parallel wall construction. . As seen in Figures 5, 6 and 7 of the drawings, the emitting unit 1 is attached to the inner surface of a duct 29 in a precise manner in the intermeshed portions 8 and 22 of the receiver members 2 and 3 and cover, and this act of union permanently secures the members 2 and 3 together and secures their sealing connection between themselves and the conduit 30. Reference will now be made to figures 4, 5, 6 and 7 of the drawings for explanation of the mode of operation of a drip irrigation system that incorporates the unit 1 station that has just been described and illustrated.

The irrigation water flows through the conduit 30 and passes through the filtering inlet channels 17a and 17b and the molded slot 21, and via the coupling channel 19 and the central opening 19a into the well 13. The pressure from? Water from the inlet stream displaces the diverted seal supposition membrane 4 over the peripheral well flange 16 (as seen in Figures 4 and 6), which allows the flow of water in the direction of the arrows shown in Figure 6. through a flow restriction flow path defined between the membrane 4 and the flow restriction groove 11c within the intermediate terminal slot portion 11b. The water then passes via the communication aperture 28 into the interior of the entrance slot portion 24b, through an elongated flow restriction flow path, defined between the membrane 4 and the slot portion 24c, and into the interior of the recess 24a. The water emerges from the recess 24a via the recess outlet 26, which has an extended flow rate restriction underlying the flow resistance path so that it emerges as a drop without pressure. The membrane 4, which rests on the rim of the recess 24a, defines with the recess 24a an effective exit control chamber with a surface of the membrane 4 exposed to the pressure of the inflow and the opposite surface of the membrane 4 exposed to the flow pressure in the outlet control chamber. Therefore, there is a differential pressure control whereby, when the fluid inlet pressure pressure exerted on the first surface of the membrane 4 exceeds the fluid pressure in the outlet control chamber by a predetermined amount, the The membrane 4 is bent towards the recess outlet 26 so as to define a restricted outlet flow path with the recess outlet. Such differential pressure control, as applied to irrigation emitting units, has been previously described, for example, in the? 287 patent. It will be understood that with the emitter units according to the present invention, the use of box-like housings allows to provide a double layer and therefore particularly elongate flow restriction flow paths. Such long flow restriction flow paths have width dimensions which are significantly greater than those which can be used with conventional construction emitting units and this, of course, is of considerable importance in minimizing damage to the path blockages of flow by pebbles or similar. It will be appreciated, however, that the invention is equally applicable to emitting units having only one flow restriction layer. Similarly, the invention is equally applicable to emitter units where the layer or each of the flow restriction layers has more than one flow restriction flow path. Although the invention has been specifically described with reference to the use of the membrane so as to obtain differential pressure control, it will be understood that the invention is equally applicable to emitting units that use different forms of flow control and where the membrane serves to define with the walls of the inner housing the flow restriction path and also to interact with it so that an effective flow control is provided. Furthermore, although the application of the invention has been specifically described in the context of the union of the emitting units to a conduit excluded during the exclusion process, the invention is equally applicable to the union of emitting units according to the invention to a inner surface of a duct strip preform which is subsequently subsequently welded at its longitudinal edges so as to form the duct. In addition, the use of a relatively substantial wall of the receiver member 2 for provision of the filtering inlet channels again allows the use of inlet flow paths which are relatively larger in width compared to conventional emitting units., here again the blocking hazards are minimized. This is of particular importance when, as in the emitter unit described and illustrated specifically, a non-return valve construction is not provided. With such construction, only a single restricted entry 19, 19a is available within the emitting unit, and such restricted entry can not be accommodated by a suitable filtering means. Therefore, such means are provided by means of filtering inflow channels which is made possible by the construction of the emitting unit according to the invention. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers.

Claims (35)

CLAIMS Having described the invention as above, the content of the following claims is claimed as property:

1. An emitting unit adapted to be integrally connected to an internal surface of a conduit, characterized in that it comprises an elongate housing, a housing inlet adapted to communicate with the interior of the conduit; an outlet of the housing adapted to communicate with a conduit outlet; an elongated flow restriction flow path formed in the housing; a flow path entry communicating with the housing entrance; a flow path output communicating with the outputs of the housing; a resiliently flexible membrane mounted in the housing; the housing is in a similar manner to a closed box and is constituted of a mounting of a receiving member and a cover member; the receiver and cover members are elongated in the direction of their longitudinal axes extending along the length of the conduit and have a means of interengagement of projection and recess formed along the lengths and in the elongated flange portions of the members. members, the projecting and recessing means has walls directed substantially transversely to the longitudinal axis of the members so that the projecting means of one member is adapted to form a closure that is press-fitted with the corresponding recess means of the other member.

2. The emitter unit, according to claim 1, characterized in that the members are provided with a plurality of projection and recess interengaging means.

3. The emitter unit, according to claim 2, characterized in that the successive interengagement means of projection and recess are arranged in arrays.

4. The emitter unit, according to any of the preceding claims, characterized in that the means or each of the projection interengaging means is in its narrowest part adjacent to the flange portion of the member from which it extends, and is widened. outwards, towards the flange portion of the other member while the middle or each of the recess interengaging means is at its widest portion adjacent to the flange portion of the member in which it forms and narrows downward toward the flange portion of the other member.

5. The emitting unit, according to claim 4, characterized in that each recess interengaging means has formed therebetween a recessed resilient projection interengagement means formed therebetween.

6. The emitting unit, according to claim 3, characterized in that the projection means and the corresponding recess means are in a substantial form of dovetail.

7. The emitter unit, according to any of the preceding claims, characterized in that a recess having a recess outlet formed in a recess base is formed in the recess, the recess has a ridge of area substantially greater than the area of the recess. recess output and is of extended dimensions compared to the width of the flow path; a first surface of the membrane is adapted to be exposed to the fluid inlet flow pressure; a second opposite surface of the membrane is juxtaposed to the flange so that it is pressed against the flange under the inlet flow pressure; and in this way an exit control camera is defined with the recess; the arrangement is such that when the fluid inlet pressure exceeds the fluid pressure in the outlet control chamber by a predetermined amount, the membrane is bent towards the outlet of the recess so as to define with an outlet of the recess a restricted output flow path.

8. The emitting unit, according to any of the preceding claims, characterized in that an elongated slot is formed on the inner surface of at least one of the members which, together with the membrane, defines the restriction flow path of flow.

9. The emitting unit, according to claim 8, characterized in that elongated slots are formed on the inner surfaces of both membranes which, together with the membrane, respectively define the component of the flow paths that restrict the flow * which is communicated via a communication aperture formed in the membrane.

10. The emitting unit, according to claim 8 or 9, characterized in that each slot is formed with a pair of arrangements directed in an opposite manner of flow restriction deflectors.

11. The emitting unit, according to claim 9 or 10, when dependent on claim 7, characterized in that the flow path entry is associated with the first of the slots, the output of the flow path is associated with the second of the slots, the housing inlet is formed in the first of the members, the outlet of the housing and the recess are formed in the second of the members, and the communication opening is formed in the membrane adjacent to the downstream end of the first one. slot and one end upstream of the second slot.

12. The emitter unit, according to any of the preceding claims, characterized in that the housing inlet includes an inlet well projecting into the housing and having a peripheral wall flange against which the membrane normally deviates in a sealing manner, the arrangement is such that a predetermined minimum fluid inlet pressure pressure rests on the membrane and is effective to displace the membrane from its sealing coupling with the well flange.

13. The emitting unit according to any of the preceding claims, characterized in that an elongated inlet flow channel communicating with at least one elongated edge of one of the members is formed on an outer surface thereof. with the entrance of the housing, adapted to be exposed to the interior of the conduit and having an array of filter deflectors located along the length thereof.

14. The emitter unit, according to claim 13, characterized in that the pair of elongated inflow channels are respectively formed adjacent to the elongated opposite edges of a member.

15. The emitting unit, according to claim 13 or 14, characterized in that each of the elongated inflow channels is formed on the outer surface of the receiving member.

16. The emitting unit, according to claim 13, 14 or 15, when dependent on claim 1, characterized in that the inflow channels all flow into the housing entrance.

17. The emitting unit, according to any of claims 13 to 16, characterized in that the inflow channels are partially covered.

18. A drip irrigation system, characterized in that it comprises an irrigation conduit and a succession of separate emitting units, according to any of the preceding claims attached to an inner surface of the conduit in the inter-coupled flange portions of the members.

19. A emitting unit, adapted to be integrally connected to an internal surface of a conduit, characterized in that it comprises an elongated housing, a housing inlet adapted to communicate with the interior of the conduit, a housing outlet adapted to communicate with the outlet of the conduit; the housing is assembled from the elongate receiver and cover members, adapted to be coupled together to together form a box-like structure; elongated grooves formed respectively on the inner surfaces of both members; a resiliently flexible membrane mounted in the housing and which is superimposed on the grooves so as to define therewith a component of flow paths that restrict flow which are communicated via a communication aperture formed in the membrane, a path input flow of one of the component flow paths communicates with the entrance of the housing; a flow path output from the other of the component flow paths communicating with the outlet of the housing.

20. The emitting unit, according to claim 19, characterized in that each groove is formed with a pair of arrangements directed in an opposite manner of flow restriction deflectors.

21. The emitter unit, according to claim 19 or 20, characterized in that a recess having a recess outlet formed in a recess base is formed in the recess, the base has a flange of substantially greater area than the recess area. the recess output and is of extended dimensions compared to the width of the flow path; a first surface of the membrane is adapted to be exposed to fluid inlet flow pressure; a second opposing surface of the membrane is juxtaposed to the flange so that it is pressed against the flange under the inlet flow pressure; and in this way an exit control camera is defined with the recess; the arrangement is such that when the fluid inlet pressure exceeds the fluid pressure in the outlet control chamber by a predetermined amount, the membrane flexes toward the exit of the recess so that it defines with the outlet of the recess a restricted output flow path.

22. The emitter unit according to any of claims 19 to 21, characterized in that the housing inlet includes an inlet well projecting into the housing and having a peripheral well flange against which the membrane is juxtaposed.

23. The emitting unit, according to claim 22, characterized in that the membrane is normally seated in a sealing manner against the peripheral well flange, the arrangement is such that a predetermined minimum fluid inlet pressure pressure resting on the membrane is effective to move the membrane of its sealing coupling with the flange of the well.

24. The emitting unit, according to any of claims 19 to 23, characterized in that the plurality of elongated slots are formed on the inner surface of one or both members, the slots formed in each inner surface communicate with each other so as to define with the membrane a component flow path.

25. An emitting unit, characterized in that it is adapted to be integrally connected to an internal surface of a conduit comprising a housing, an elongated and partially covered inlet flow channel formed in the outer surface of the housing and adapted to be exposed to the inside of the housing. conduit and extending along it, communicating with the entrance of the housing adapted to communicate with the interior of the conduit, a housing outlet adapted to communicate with the outlet of the conduit, a flow path outlet communicating with the outlet of the housing, and a filter deflector array formed along the length of the inflow channel.

26. The emitting unit, according to claim 25, characterized in that the plurality of input flow channels are formed at separate positions of the outer surface, and wherein a communication channel is formed on the outer surface directed transversely with respect to the Inlet flow channels and in which the housing entrance is formed so that the water flow in the inflow channels flows into the housing inlet.

27. The emitting unit, according to claim 25 or 26, characterized in that the partially covered inlet flow channels are formed by a trimming molding process.

28. The emitting unit according to any of claims 25 to 27, characterized in that the housing entrance includes an inlet well projecting into the housing and having a peripheral wall flange against which the membrane is juxtaposed.

29. The emitting unit, according to claim 28, characterized in that the membrane is normally sealed in a sealed manner against the peripheral well flange, the arrangement is such that a predetermined minimum fluid inlet pressure pressure resting on the membrane is effective to move the membrane of its sealing coupling with the well flange.

30. The emitting unit, according to claim 1, characterized in that the membrane is mounted in the housing so that it is superimposed and interengaged with at least a portion of the flow path.

31. The emitting unit according to claim 30, characterized in that the housing inlet includes an inlet well projecting into the housing and having a peripheral well flange against which the membrane is juxtaposed.

32. The emitting unit, according to claim 31, characterized in that the membrane is normally sealant deflected against the edge of the peripheral well, the arrangement is such that a predetermined minimum fluid inlet pressure pressure rests on the membrane and is effective to displace the membrane of its sealing coupling with the flange 'of the well.

33. The emitting unit, according to claim 1, characterized in that the membrane is adapted to restrict the outflow.

34. The emitting unit, according to claim 1, characterized in that the walls interact when the housing is assembled.

35. The emitting unit, according to claim 1, characterized in that the walls are directed transversely to the longitudinal axes as seen in a direction of assembly of the members. IMPROVED IRRIGATION ISSUING UNIT SUMMARY OF THE INVENTION An emitting unit to be integrally connected to an internal surface of a conduit and comprising an elongate housing, a housing inlet (1) adapted to communicate with the interior of the conduit, and an outlet (26) of the housing adapted to communicate with the exit of the conduit. A flow path (11) restricting elongated flow is formed in the housing having a flow path inlet communicating with the inlet (13) of the housing and a flow path outlet (11b) communicating with the exit (26) of the accommodation. A resiliently flexible membrane (4) is mounted in the housing which has a closed box-like shape and is constituted by an elongated receiving member (2) and a corresponding elongated cover member (3). The middle (9a, 9b) of projection interengagement and recess is formed along the lengths of the portions (8a, 8b) of elongated flange of the members (2, 3) and are directed substantially transverse to the longitudinal axes of such members (2, 3) so that the projecting means (9b) of one member is adapted to form a narrow pressure fit within the corresponding recess means (9a) of the other member.