Emitter and drip-irrigation tube

Patent metadata

Field	Value
Publication number	US-2019183074-A1
Application number	US-201716322550-A
Country	US
Kind code	A1
Filing date	Jul 24, 2017
Priority date	Aug 1, 2016
Publication date	Jun 20, 2019
Grant date	—

Abstract

This emitter comprises an emitter body and a resin film, and has a water intake part, a discharge part, a flow channel, and a flow rate reduction part. The water intake part takes in irrigation liquid. The discharge part discharges the irrigation liquid. The flow channel connects between the water intake part and the discharge part so as to allow the irrigation liquid to circulate therein. The flow rate reduction part reduces the flow rate of the irrigation liquid in response to a deformation of the film caused by the pressure of the irrigation liquid. At least one of the surfaces of the film includes a spiral-shaped ridge part disposed at a position corresponding to the flow rate reduction part.

First claim

1 . An emitter configured to be joined on an inner wall surface of a tube for distributing irrigation liquid at a position corresponding to a discharging port for communicating between inside and outside of the tube, the emitter being configured to quantitatively discharge the irrigation liquid in the tube to the outside of the tube from the discharging port, the emitter comprising:
an emitter main body including a first surface and a second surface disposed opposite each other; a film having flexibility and including a third surface and a fourth surface disposed opposite each other, the film being made of resin, the fourth surface being joined on the first surface of the emitter main body; an intake part disposed in the first surface of the emitter main body, and configured to receive the irrigation liquid; a discharging part disposed in the second surface of the emitter main body, and configured to discharge the irrigation liquid; a channel configured to connect the intake part and the discharging part in the emitter main body and configured to distribute the irrigation liquid; and a flow rate reducing part disposed in the channel, and configured to reduce a flow rate of the irrigation liquid in accordance with deformation of the film under a pressure of the irrigation liquid in the tube, wherein the film includes a protrusion line part having a spiral form, the protrusion line part being disposed at a position corresponding to the flow rate reducing part in the third surface or the fourth surface, or both of the third surface and the fourth surface.

2 . The emitter according to claim 1 , wherein the flow rate reducing part includes:
a recess disposed in the first surface of the emitter main body; a diaphragm part having flexibility that is a portion of the film, and is disposed to close an opening of the recess, the diaphragm part being configured to be distorted in a direction of the recess when the pressure of the irrigation liquid in the tube exceeds a predetermined value; a first through hole opening at an inner surface of the recess, and communicated with one of the discharging part and the channel; a second through hole opening at the inner surface of the recess, and communicated with the other of the discharging part and the channel; a valve seat part disposed opposite the diaphragm part to surround the first through hole or the second through hole without making contact with the diaphragm part, wherein the valve seat part is allowed to make intimate contact with the diaphragm part when the pressure of the irrigation liquid in the tube is greater than the predetermined value; and a communication groove formed in a surface of the valve seat part where the diaphragm part is allowed to make intimate contact with the valve seat part, the communication groove being configured to communicate between the inside of the recess and the first through hole or the second through hole surrounded by the valve seat part, wherein the protrusion line part is disposed in the diaphragm part.

3 . The emitter according to claim 2 ,
wherein the emitter is formed of one material having flexibility; and wherein the diaphragm part is integrally formed as a portion of the emitter.

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

Assignees

• Enplas Corp

Inventors

• Morikoshi Daisuke

Classifications

• A01G25/023 Primary

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

• F04B43/02 Primary

  having plate-like flexible members, e.g. diaphragms (F04B43/14 takes precedence) · 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

• Y02A40/22

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