| 主权项 |
1. An emitter for quantitatively discharging irrigation liquid in a tube from a discharge port communicating between an inside and an outside of the tube, the emitter being configured to be joined to an inner wall surface of the tube configured to distribute the irrigation liquid at a position corresponding to the discharge port, the emitter comprising:
an emitter main body composed of a resin molded body including at least a recess and a through hole; and a flexible film joined to at least one surface of the emitter main body, the flexible film forming a channel by sealing at least a part of an opening of the recess and the through hole, wherein: the emitter further comprises: an intake part for receiving the irrigation liquid in the tube, a liquid receiving amount regulating part for regulating a flow rate of the irrigation liquid received from the intake part in accordance with a pressure of the irrigation liquid in the intake part, a pressure reduction part for allowing the irrigation liquid supplied from the liquid receiving amount regulating part to flow therethrough while reducing the pressure of the irrigation liquid, a discharge rate regulating part for regulating a flow rate of the irrigation liquid supplied from the pressure reduction part in accordance with the pressure of the irrigation liquid in the tube, and a discharge part to which the irrigation liquid, having a flow rate controlled by the discharge rate regulating part, is supplied, the discharge part being to be facing the discharge port, and the discharge rate regulating part includes:
a diaphragm part being a part of the film and being disposed to block a communication between a channel on a downstream side relative to the pressure reduction part and an inside of the tube,a valve seat part depressed with respect to the diaphragm part and disposed at a position where the valve seat part faces the diaphragm part in the channel on the downstream side relative to the pressure reduction part without making contact with the diaphragm part, but the valve seat part being capable of making close contact with the diaphragm part,a hole opening at the valve seat part and communicating with the discharge part, anda groove formed on the valve seat part and configured to communicate between the hole and the channel on outside relative to the valve seat part; and the diaphragm part makes close contact with the valve seat part when the pressure of the irrigation liquid in the tube is equal to or higher than a predetermined value. |
