#$%^&*AU2020101301A420200813.pdf#####ABSTRACT The present invention provides a double-ellipse-streamline rotary punch-in head of an emitter. The punch-in head includes an inverted cone, an inlet, a cone neck, an emitter cavity and an emitter outlet tube. An upper end surface of the inverted cone is provided with the inlet, and a lower surface of the inverted cone communicates with the cone neck, the emitter cavity and the emitter outlet tube in sequence from top down. A cross-sectional contour of the inverted cone is a double-ellipsestreamline curve. A cross-sectional contour of the cone neck is a double-ellipse-streamline curve, which encloses the same area on upper and lower end surfaces. The present invention reduces the shape resistance of the punch-in head of the emitter to the maximum extent, thereby solving the problem of large local head loss. 1586 FIG. 3 - a - 11 -r~ FIG. 4 17
