Emitter and drip irrigation tube

Patent metadata

Field	Value
Publication number	US-10849285-B2
Application number	US-201616061026-A
Country	US
Kind code	B2
Filing date	Nov 11, 2016
Priority date	Dec 9, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

This emitter (120) comprises: a first flow rate adjustment unit which adjusts the flow rate of an irrigation liquid according to the deformation of a first diaphragm (160); and a second flow rate adjustment unit which adjusts the amount of irrigation liquid ejected (discharged) from the emitter (120) according to the deformation of a second diaphragm (170). The first diaphragm (160) has a projection spaced apart by a space from a hole which is a flow path for the irrigation liquid. The projection has an inverted truncated cone shape and is formed so that the space widens as the projection goes into the hole.

First claim

The invention claimed is:

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 of the tube for communicating between an inside and an outside of the tube, and configured to quantitatively discharge the irrigation liquid in the tube out of the tube from the discharging port, the emitter being made of a resin, the emitter comprising:
an intake part configured to communicate with the inside of the tube when the emitter is joined on the tube;
a pressure reducing channel part communicated with the intake part, and configured to form a pressure reducing channel for carrying the irrigation liquid while reducing a pressure of the irrigation liquid;
a first flow rate adjusting part communicated with the pressure reducing channel part, and configured to adjust a flow rate of the irrigation liquid in accordance with a pressure of the irrigation liquid in the tube;
a second flow rate adjusting part communicated with the pressure reducing channel part and the first flow rate adjusting part, and configured to adjust the flow rate of the irrigation liquid in accordance with the pressure of the irrigation liquid in the tube; and
a discharging part communicated with the second flow rate adjusting part, and configured to face the discharging port when the emitter is joined on the tube,
wherein the first flow rate adjusting part includes
a valve seat,
a communication hole opening at the valve seat and communicated with the second flow rate adjusting part, and
a diaphragm part having flexibility and separated from the valve seat, the diaphragm part being configured to be brought close to the valve seat when the pressure of the irrigation liquid in the tube is exerted on the diaphragm part, and wherein the diaphragm part includes a protrusion configured to be disposed at an opening of the communication hole such that a gap is formed between the protrusion and the opening of the communication hole, the protrusion having a shape with which, the closer the diaphragm part is to the valve seat, the more deeply the protrusion is inserted to the communication hole and the wider the gap between the protrusion and the opening of the communication hole.

2. The emitter according to claim 1 , wherein:
the second flow rate adjusting part includes:
a discharging side valve seat,
a discharging side communication hole opening at the discharging side valve seat and communicated with the discharging part, and
a discharging side diaphragm part having flexibility and separated from the discharging side valve seat, the discharging side diaphragm part being configured to be brought close to the discharging side valve seat when the pressure of the irrigation liquid in the tube is exerted on the discharging side diaphragm part; and
the diaphragm part is made of a resin material that allows the diaphragm part to be more easily bent than the discharging side diaphragm part at a high temperature.

3. A drip irrigation tube, comprising:
the tube including the discharging port for discharging irrigation liquid; and
the emitter according to claim 1 .

Assignees

• Enplas Corp

Inventors

• Noguchi Koji

Classifications

• A01G25/006

  Tubular drip irrigation dispensers mounted coaxially within water feeding tubes · CPC title

• Y02A40/22

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

• A01G25/023 Primary

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

• A01G2025/006

  Human Necessities · mapped topic

• Y02A40/237

  Cross-Sectional Technologies · mapped topic