Emitter and drip irrigation tube

Patent metadata

Field	Value
Publication number	US-2018168117-A1
Application number	US-201615577567-A
Country	US
Kind code	A1
Filing date	May 17, 2016
Priority date	May 29, 2015
Publication date	Jun 21, 2018
Grant date	—

Abstract

This emitter ( 120 ) comprises, downstream of a first pressure reducing flow path, a discharge amount adjustment part and a discharge part. The discharge amount adjustment part communicates with the discharge part via two flow paths: a first hole ( 173 ); and a communication flow path including a second hole ( 174 ) and a second pressure reducing flow path. An irrigation liquid is supplied directly to the discharge part from the discharge amount adjustment part through the first hole ( 173 ) when the external liquid pressure is low, and supplied to the discharge part from the discharge amount adjustment part through the second hole ( 174 ) and the second pressure reducing flow path when the external liquid pressure is high.

First claim

1 . An emitter configured to be joined on an inner wall surface of a tube for carrying irrigation liquid at a position corresponding to a discharging port communicating between inside and outside of the tube, the emitter being configured to quantitatively discharge the irrigation liquid in the tube from the discharging port to the outside of the tube, the emitter comprising:
a water intake part for intake of the irrigation liquid in the tube; a first pressure reduction channel part for forming a first pressure reduction channel configured to allow the irrigation liquid received at the water intake part to flow therethrough while reducing a pressure of the irrigation liquid received at the water intake part; a discharge rate adjusting part for controlling a flow rate of the irrigation liquid supplied from the first pressure reduction channel in accordance with a pressure of the irrigation liquid in the tube; a discharging part for housing the irrigation liquid supplied from the discharge rate adjusting part, the discharging part being configured to face the discharging port; and a communication channel part configured to communicate between the discharge rate adjusting part and the discharging part, wherein the discharge rate adjusting part includes:
a recess,
a film having flexibility, the film being disposed such that the film is separated from the recess and is capable of making close contact with the recess when the pressure of the irrigation liquid in the tube is equal to or greater than a set value,
a supply port communicated with the first pressure reduction channel part and configured to supply the irrigation liquid to the recess,
a first hole opening at the recess and the discharging part and configured to be sealed with the film when the film makes close contact with the recess, and
a second hole opening at the communication channel part and at a position where the second hole is communicated with the supply port when the film seals the first hole, and
the communication channel part includes a second pressure reduction channel part for forming a second pressure reduction channel configured to allow the irrigation liquid to flow therethrough while reducing the pressure of the irrigation liquid.

2 . The emitter according to claim 1 , wherein the discharge rate adjusting part further includes a groove formed on a surface of the recess and configured to directly communicate between the supply port and the second hole.

3 . The emitter according to claim 2 , wherein, in plan view, the groove is formed along a longer arc of a circle around an edge of the first hole, the longer arc extending between the supply port and the second hole.

4 . The emitter according to claim 1 , wherein the communication channel part further includes an openable and closable discharging slit formed of a pair of thin pieces having flexibility, the pair of thin pieces facing each other at a position between the second pressure reduction channel part and the discharging part.

5 . The emitter according to claim 1 , wherein the water intake part further includes a screen part including a water intake slit configured to be open to the inside of the tube.

6 . The emitter according to claim 1 , wherein the discharging part further includes an intrusion preventing part for preventing intrusion of foreign matters from the discharging port.

7 . The emitter according to claim 1 , wherein the emitter is integrally molded with a resin material having flexibility.

8 . A drip irrigation tube comprising:
the tube including the discharging port for discharging irrigation liquid; and the emitter according to claim 1 joined on the inner wall surface of the tube at a position corresponding to the discharging port.

Assignees

• Enplas Corp

Inventors

• Noguchi Koji

Classifications

• A01G25/16

  Control of watering · CPC title

• B05B1/202

  comprising inserted outlet elements · CPC title

• A01G25/023 Primary

  Dispensing fittings for drip irrigation, e.g. drippers · CPC title

• Y02A40/22

  Improving land use; Improving water use or availability; Controlling erosion · CPC title

• A01G25/02

  Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation · CPC title