• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    drop irrigation emitter. a drip irrigation emitter receives liquid flowing into an irrigation tube at an inlet pressure and emits the liquid out of the emitter at an outlet pressure below the inlet pressure. the emitter comprising a path through which liquid flows in the emitter, where under a limit pressure of liquid inside the tube the emitter is adapted to emit a regulated flow of liquid out of the emitter and above the limit pressure of liquid inside the tube tube the emitter is adapted to emit a flow of unregulated liquid out of the emitter.
    公开号:BR112012020305B1
    申请号:R112012020305
    申请日:2011-02-14
    公开日:2018-05-08
    发明作者:Keren Ron
    申请人:Netafim Ltd；
    IPC主号:
    专利说明:

    (54) Title: DROP IRRIGATION ISSUER (51) Int.CI .: A01G 25/02 (30) Unionist Priority: 18/02/2010 US 61/305552 (73) Holder (s): NETAFIM LTD.
    (72) Inventor (s): RON KEREN “DROP IRRIGATION EMITTER”
    TECHNICAL FIELD
    The present description refers to drop irrigation emitters, which are used to control the supply of liquid to plants.
    BACKGROUND OF THE INVENTION
    Such drop emitters are normally coupled to an irrigation pipe and are provided with an inlet, an outlet and a flow restriction path between them. The liquid passing from the tube via the inlet into the emitter passes through the flow restriction path to be released at the emitter outlet at a relatively slow discharge pressure, equal to close to zero.
    U.S. Patent No. 6,250,571, the description of which is incorporated herein by reference, describes a drop irrigation emitter, having a non-regulating maze that works to reduce water pressure entering the emitter before reaching a regulating maze. A modification of the emitter has an opening that serves as an exit from the non-regulating labyrinth and an entrance to the regulating labyrinth. This opening is covered by a membrane that functions as a one-way valve, allowing water to flow only from the non-regulating maze to the regulating maze.
    U.S. Patent No. 5,111,996, the description of which is incorporated herein by reference, describes an emitter having valves that are used to control the length of a passage by limiting the flow of fluid. The passage is divided into sections and, as the pressure in the tube increases beyond predetermined values, the valves that are located along the passage close to force the fluid to flow through additional sections of the passage.
    SUMMARY
    The following embodiment and its aspects are described and illustrated together with systems, tools and methods that are intended to be exemplary and illustrative, not limiting the scope.
    In one embodiment, a drip irrigation emitter comprises an inlet through which liquid enters the emitter from an irrigation pipe, an outlet communicating with the external environment, a flow path extending between the inlet and outlet, said flow path comprising pressure reducing flow parts, a ventilation zone and a regulating zone to regulate the liquid flow leaving the emitter via the outlet, the emitter further comprising a duct which is adapted to provide fluid communication between the zone ventilation and the external environment above a limit liquid pressure inside the tube.
    Optionally, the ventilation zone is located between the pressure reducing parts and the regulating zone.
    Optionally, an emitter seal can prevent fluid communication via the duct below the limit pressure and allow fluid communication via the duct above the limit pressure.
    Optionally, the duct comprises pressure reducing parts downstream of the seal.
    In another embodiment, a drop irrigation emitter for receiving liquid flowing into an irrigation tube at an inlet pressure and emitting the liquid out of the emitter at an outlet pressure less than the inlet pressure, the emitter comprising a flow path, through which the liquid flows in the emitter, in which, under a pressure of limit liquid within the tube, the emitter is adapted to emit a regulated flow of liquid out of the emitter, and in which above the pressure of limit liquid within the tube the emitter is adapted to at least partially emit a flow of substantially unregulated liquid out of the emitter.
    Optionally, the flow path comprises a regulating zone, which is adapted to regulate the flow of liquid out of the emitter below the limit liquid pressure within the tube and where, above the limit liquid pressure within the tube, the flow of net out of the issuer is substantially unaffected by the regulatory zone.
    In addition to the exemplary aspects and embodiment described 5 above, other aspects and embodiments will become evident by reference to the figures and by studying the following detailed descriptions. BRIEF DESCRIPTION OF THE FIGURES
    Exemplary embodiments are illustrated in the referenced figures. It is intended that the embodiments and figures described here are considered illustrative, rather than restrictive. The description, however, as far as the organization and method of operation, together with its objects, details and advantages, can best be understood by reference to the following detailed description, when dealing with the accompanying figures, in which:
    Fig. 1 shows a top perspective view of a drop emitter according to the present description;
    Fig. 2 shows an exploded view of the drip emitter of the
    Fig. 1;
    Fig. 3 shows the drop emitter of Fig. 1 with a first embodiment of its valve being shown in an exploded form;
    Fig. 4 shows the drop emitter of Fig. 1, with a second embodiment of the valve being shown in an exploded form; and
    Figs. 5A and 5B show cross-sectional views of the drop emitter of Fig. 1.
    It is observed that, for simplicity and clarity of illustration, the elements shown in the figures were not necessarily scale drawings. For example, the dimensions of some of the elements may be exaggerated in relation to other elements for clarity. In addition, where deemed appropriate, reference numerals may be repeated within the figures, to indicate equal elements.
    DETAILED DESCRIPTION OF THE INVENTION
    Attention is first drawn to Figs. 1 and 2. A drip irrigation emitter 10 has a body 12, a cover 14 and a flexible diaphragm 16 which is pressed between them. A flow path 20 of the emitter 10 has a regulating zone 18 in an optional shape of a chamber or cavity that is formed on a lower side of the body 12. The pressure reducing parts 22 of the flow path 20 are formed over a part of the flow path 20 which empties downstream into the regulating zone 187. The pressure reducing parts 22 which, in this example, are in the form of deflecting teeth projecting into the flow path 20, exhibit relatively high resistance to the flow of liquid per unit length and, as a result, the pressure of the liquid entering the emitter 10 at a relatively high inlet pressure, falls rapidly when the liquid flows through it.
    The body 12 of the emitter 10 has, in addition, a recess 24 formed on its upper side which is bounded by a peripheral wall
    26. An output 28 of the emitter 10, which extends through the body 12, communicates between the regulating zone 18 and the recess 24. In one embodiment, the emitter 10 is adapted to be fixed on the upper side of the body to a irrigation tube (not shown) with a part of the tube overlapping the recess 24. An opening, for example, formed in that part of the tube (not shown) provides fluid communication between the recess 24 and thus the emitter 10 and the external environment.
    The cover 14 has top and bottom sides; and an inlet 30 in an optional shape of an elongated channel opens outwards from the top and bottom sides of the cover 14. Filter ribs forming inlets between them are located along the inlet 30 to filter liquid entering the emitter 10. It must be noted that directional terms appearing throughout the report and claims, p. eg, "front", "rear", "up", "down" etc. (and its derivatives) are for illustrative purposes only and are not intended to limit the scope of the attached claims.
    In addition, we note that the directional terms "down" and "bottom" (and their derivatives) define identical directions.
    Attention is further drawn to Fig. 3. The emitter 10 has a valve 32 according to a first embodiment of the present description, which includes a seal 34 in an optional form of a flexible diaphragm, a support 36 and a duct 38. Duct 38 has a first part 40 that extends between the upper and lower sides of the body 12 and provides fluid communication between a ventilation zone 42 (Fig. 2) of the flow path 20, which is located between the zone regulator 18 and pressure reducing parts 22; and a concave hub 44 of duct 38, which is formed in the recess 24.
    A raised rim 46 of valve 32 circumscribes the first duct portion 40, where it opens into hub 44 and a raised annular support 48 is formed on hub 44 away from rim 46. A substantially free second portion 50 of duct 38 of pressure reducing obstructions is formed in the recess 24 and communicates with the hub 44 and with the space between the rim 46 and the support 48.
    Attention is drawn to Figs. 1, 5A and 5B. The seal 34 is located in the hub 44 with its periphery resting on the support 48 and its most central circular part being seated against the rim 46. The support 36 has an opening 52 which is located above a part of the seal 34, thereby pressing seal 34 to seat against rim 46, to substantially seal duct 38 against ingress and egress of liquid. The upper side of the seal 34 is in communication with the recess 24 and, thus, with the external environment and at least one art on the lower side of the seal 34, which is limited by the rim 46, is in communication with the ventilation zone.
    42. The support 36 also overlays the hub 44 of the duct 38 and a part of the second part of the duct 50, thus forming a closed covered channel in the second part of the duct 50, which opens out into the recess 24, to communicate with the external environment.
    Attention is drawn only to Fig. 5A. Up to a given pressure limit in the PT tube, the liquid indicated by the arrows 54, which entered the emitter 10 from the irrigation tube (not shown), via the inlet 30, flows in the flow path 20 along an underside of the diaphragm 16 facing the cover 14 and then enters the body 12 to flow, via the pressure reducing parts 22 and ventilation zone 42, into the regulating zone 18. The pressure of the liquid outside the emitter 10 and inside the tube is transmitted via the inlet 30 for a part of the diaphragm 16, which is located under the regulatory zone 18. This pressure is illustrated by short arrows 56.
    An increase in the liquid pressure inside the tube can cause that part of the diaphragm 16 to move into the regulatory zone 18. The resistance of the liquid flow into the regulatory zone 18 of the flow path 20 and the regulatory zone 18 via the outlet 18 for the recess of the emitter 24 and the external environment is a function of this displacement. When the displacement of diaphragm 16 into the regulatory zone 18 is increased, this resistance is increased. As a result, the part of the diaphragm 16 which is located under the regulating zone 18 operates to regulate the flow of liquid from the irrigation pipe through the emitter 10 and the flow rate of the liquid leaving the emitter 10 is substantially independent of the inlet pressure to a given pressure range for which the emitter 10 is designed to operate. Notably, other methods of regulating the flow of liquid in the regulatory zone 18 can be used according to some embodiments of the present description.
    We draw your attention to Fig. 5B. When the pressure of the liquid inside the tube exceeds the predetermined limit level PT, a pressure differential develops between the lower side of the seal 34, which is exposed to the ventilation zone 42, and its upper side which communicates with the external environment. This stretches the seal 34 to remove the rim 46 and allows the liquid indicated by the arrow 58 to exit the emitter 10 via the duct 38.
    In a drop emitter 10 with a valve 32 according to the first embodiment (Fig. 3), the pressure of the liquid in the ventilation zone 42 drops when the seal 34 withdraws from the rim 46 to a level substantially equal to that of the external environment. This can be explained as a result of an increase in the liquid flow rate passing through the flow path 20, which results in an increase in the pressure drop through the flow path 20. In some embodiments, this can result in pressure on both sides of the seal 34 being substantially the same, which causes the seal to contract back to the rim 46 and reverse the duct 38 to stop the flow of liquid leaving the duct
    38.
    Under the assumption that the liquid pressure in the tube has not changed, then the cessation of flow out of the emitter 10 via duct 38 is only momentary since the pressure differential, which caused seal 34 to rise from rim 46 , is reestablished. In general, this “vibration” cycle of sealing and depleting duct 38 can be repeated, causing emitter 10 to repeatedly emit pulses of liquid via duct 38. Such pulses can form a cleaning process in which foreign matter, such as as sand or similar, which may have accumulated, for example, in the flow path of emitter 20, is pressed to leave emitter 10 via duct 38.
    Attention is further drawn to Fig. 4, showing a drip emitter 10 having a valve 60 according to a second embodiment of the present description. The structure of the second embodiment of the valve 60 is generally similar to that of the first embodiment 32, however with the addition of pressure reducing parts or obstructions 62, which are located downstream of the seal 34, optionally in the second part 50 of the duct 38.
    As in the first embodiment, the pressure of liquid in the tube exceeding the predetermined threshold level PT causes a pressure differential between the lower side of the seal 34, exposed to the ventilation zone 42, and the upper side of the seal 34 communicating with the external environment that stretches seal 34 to detach from rim 46 and let the liquid leave the emitter 10 via duct 38. The liquid lifting the seal 34 flows via pressure reduction obstructions 62 and then leaves duct 38 to communicate with the external environment. The pressure of PU liquid upstream of the pressure reducing obstructions 62 is substantially equal to the pressure of liquid under the seal 34. In some embodiments, the pressure of liquid within the tube is such that the resulting pressure PU under the seal 34 keeps seal 34 lifted from rim 46 to maintain a continuous flow of liquid leaving emitter 10 via duct 38.
    Notably, such a flow of liquid that optionally deviates from the regulating zone 18 of emitters 10 incorporating one of the valves 32, 60, exhibits an unregulated flow rate, which substantially depends on the pressure of liquid in the tube, so that an elevation of the liquid pressure in the tube will result in an increase in the liquid flow rate leaving the emitter 10 via duct 38. In a valve incorporating the emitter 60, the liquid pressure in the tube, which is sufficient to maintain the continuous liquid flow via duct 38, it is determined, for example, by the dimensions of the rim 46 and the elasticity and dimensions of the diaphragm 16. Variations, among others, in those dimensions can result in the fatod and the pressure of liquid inside the tube being lower, greater than or equal to predetermined limit level PT.
    In the description and claims of this application, each of the verbs "understand", "include" and "have" and their conjugates are used to indicate that the object or objects of the verb are not necessarily a complete listing of members, components, elements or parts of the subject or subjects of the verb.
    Although the present embodiment has been described to a certain degree of particularity, it should be understood that various changes and modifications could be made without deviating from the scope of the description as claimed below.
    权利要求:
    Claims (4)
    [1]
    1. Drop irrigation emitter (10), comprising:
    an inlet (30) through which the liquid enters the emitter (10) of an irrigation pipe;
    5 an outlet (28) communicating with the external environment;
    a flow path (20) extending between the inlet (30) and the outlet (28), the flow path (20) comprising pressure reducing flow parts (22), a ventilation zone (42) and a zone regulator (18), the regulator zone (18) to regulate the liquid flow leaving the emitter (10) via the outlet (28),
    10 characterized by the fact of still understanding:
    a duct (38) which is adapted to provide fluid communication between the ventilation zone (42) and the external environment above a threshold liquid pressure in the tube;
    a seal (34) to prevent fluid communication via the duct 15 (38) below the threshold pressure and to allow fluid communication via the duct (38) above the threshold pressure;
    a body (12), a cover (14) and a flexible diaphragm (16) pressed between the body (12) and the cover (14), and at least part of the flow path (20) is formed between the diaphragm (16 ) and the body (12) and between the diaphragm (16)
    20 and the cover (14).
    [2]
    2. Drop irrigation emitter (10) according to claim 1, characterized by the fact that the ventilation zone (42) is located between the pressure reducing parts (22) and the regulating zone (18).
    [3]
    3. Drop irrigation emitter (10) according to claim 1, characterized by the fact that the duct (38) comprises pressure reducing parts downstream of the seal (34).
    [4]
    4. Drop irrigation emitter (10) according to claim 1, characterized by the fact that a portion of the diaphragm is located below the regulating zone (18).
    Petition 870180002112, of 10/01/2018, p. 7/8
    IN
    1/3
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    法律状态:
    2017-10-17| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2018-04-17| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2018-05-08| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|
    2021-12-14| B21F| Lapse acc. art. 78, item iv - on non-payment of the annual fees in time|Free format text: REFERENTE A 11A ANUIDADE. |
    优先权:
    申请号 | 申请日 | 专利标题
    US30555210P| true| 2010-02-18|2010-02-18|
    PCT/IL2011/000154|WO2011101842A2|2010-02-18|2011-02-14|Drip irrigation emitter|
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