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1. EP3262926 - EMITTER AND DRIP IRRIGATION TUBE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. An emitter (120, 320, 420, 520) configured to be joined to an inner wall surface of a tube (110) for distributing irrigation liquid at a position corresponding to a discharging port (112) that communicates between an interior and an exterior of the tube (110), the emitter (120, 320, 420, 520) being configured to quantitatively discharge the irrigation liquid in the tube (110) out of the tube (110) from the discharging port (112), the emitter (120, 320, 420, 520) comprising:

a water intake part (131) for intake of the irrigation liquid;

a discharging part (137) disposed to face the discharging port (112) and configured to discharge the irrigation liquid;

a first channel (143) configured to connect the water intake part (131) and the discharging part (137) together, and distribute the irrigation liquid;

a second channel (145) configured to connect the water intake part (131) and the discharging part (137) together, and distribute the irrigation liquid;

a flow rate reducing part (135, 535) disposed in the first channel (143, 443, 543) and configured to reduce a flow rate of the irrigation liquid in accordance with a pressure of the irrigation liquid in the tube (110);

a channel opening/closing part (136, 536) disposed in the second channel, channel (145, 445, 545), and configured to open and close the second channel (145, 445, 545) in accordance with the pressure of the irrigation liquid in the tube (110);

a pressure reducing channel (142, 542) disposed in the first channel (143, 443, 543) on an upstream side relative to the flow rate reducing part (135, 535), and configured to reduce a pressure of the irrigation liquid taken from the water intake part (131) and guide the irrigation liquid to the flow rate reducing part (135, 535); characterised by

a bypass channel (144, 544) disposed in the second channel (145, 445, 545) on an upstream side relative to the channel opening/closing part (136, 536), and configured to guide the irrigation liquid taken from the water intake part (131) to the channel opening/closing part (136, 536) while maintaining the pressure of the irrigation liquid taken from the water intake part (131) at a pressure higher than a pressure of the irrigation liquid having passed through the pressure reducing channel (142, 542) wherein:

when the pressure of the irrigation liquid flowing through the tube (110) is smaller than a first pressure, the irrigation liquid taken from the water intake part (131) is guided to the discharging part through the pressure reducing channel (142, 542) and the bypass channel (144, 544), and

when the pressure of the irrigation liquid flowing through the tube (110) is equal to or greater than the first pressure, the second channel (145, 445, 545) is closed with the channel opening/closing part (136, 536), and the irrigation liquid taken from the water intake part (131) is guided to the discharging part (137) through the pressure reducing channel (142, 542).


  2. The emitter (120, 320, 420, 520) according to claim 1, wherein:

a downstream side of the channel opening/closing part (136, 536) is connected with the flow rate reducing part (135, 535); and

when the pressure of the irrigation liquid flowing through the tube (110) is smaller than the first pressure, the irrigation liquid from the bypass channel (144, 544) is guided to the discharging part (137) through both of the channel opening/closing part (136, 536) and the flow rate reducing part, part (135, 535).


  3. The emitter (120, 320, 420, 520) according to claim 1, wherein:

the flow rate reducing part (135, 535) and the channel opening/closing part (136, 536) are independently disposed;

the irrigation liquid from the pressure reducing channel (142, 542) is guided to the discharging part (137) through the flow rate reducing (135, 535); and

the irrigation liquid from the bypass channel (144, 544) is guided to the discharging part (137) through the channel opening/closing part (136, 536).


  4. The emitter (120, 320, 420, 520) according to any one of claims 1 to 3, wherein the flow rate reducing part (135, 535) includes:

a flow rate reducing recess (171);

a first diaphragm part (175) disposed as a partition between an interior of the flow rate reducing recess (171) and an interior of the tube (110), the first diaphragm part (175) having flexibility;

a flow rate reducing through hole (161) opening at an internal surface of the flow rate reducing recess (171), and communicating with one of the discharging part (137) and the pressure reducing channel (142, 542);

a first valve seat part (172, 572) disposed to surround the flow rate reducing through hole (161) and face the first diaphragm part (175) without making contact with the first diaphragm part (175), wherein the first diaphragm part (175) is allowed to make close contact with the first valve seat part (172, 572) when the pressure of the irrigation liquid flowing through the tube (110) is equal to or greater than a second pressure that is greater than the first pressure;

a communication groove (173, 573) formed on a surface to which the first diaphragm part (175) of the first valve seat part (172, 572) is allowed to make close contact, the communication groove (173, 573) being configured to communicate between an interior of the flow rate reducing recess (171) and the flow rate reducing through hole (161); and

a discharging through hole (174) opening at the internal surface of the flow rate reducing recess (171), and communicating with the other of the discharging part (137) and the pressure reducing channel (142, 542).


  5. The emitter (120, 320, 420, 520) according to any one of claims 1 to 4, wherein the channel opening/closing part (136, 536) includes:

a channel opening/closing recess (181, 381, 581) wherein a bypass through hole (163) communicating with the bypass channel (144, 544) opens at an internal surface of the channel opening/closing recess (181, 381, 581);

a second diaphragm part (183) disposed as a partition between an interior of the channel opening/closing recess (181, 381, 581) and the interior of the tube (110), the second diaphragm part (183) having flexibility; and

a second valve seat part (182, 582) disposed to surround the bypass through hole (163) and face the second diaphragm part (183) without making contact with the second diaphragm part (183), wherein the second diaphragm part (183) is allowed to make close contact with the second valve seat part (182, 582) when the pressure of the irrigation liquid flowing through the tube (110) is equal to or greater than the first pressure.


  6. The emitter (120, 320, 420, 520) according to any one of claims 1 to 5, wherein the water intake part (131) includes a water intake side screen part (151) including a slit opening (154) to the interior of the tube (110).
  7. The emitter (120, 320, 420, 520) according to any one of claims 1 to 6, wherein the discharging part (137) includes an intrusion preventing part (192) for preventing intrusion of foreign matters from the discharging port (112).
  8. The emitter (120, 320, 420, 520) according to claim 4, wherein:

the emitter (120, 320, 420, 520) is formed of one material having flexibility; and

the first diaphragm part is integrally formed as a part of the emitter.


  9. The emitter (120, 320, 420, 520) according to claim 5, wherein:

the emitter (120, 320, 420, 520) is formed of one material having flexibility; and

the second diaphragm part (183) is integrally formed as a part of the emitter (120, 320, 420, 520).


  10. A trickle irrigation tube (100) comprising:

a tube (110) including a discharging port (112) for discharging irrigation liquid; and

the emitter (120, 320, 420, 520) according to any one of claims 1 to 9 joined to an inner wall surface of the tube (110) at a position corresponding to the discharging port (112).