| 摘要 |
A drip irrigation system provides drip action of water flowing under pressure in an irrigation supply pipe (12). A drip emitter unit (10) secured to the exterior of the supply pipe (12) receives water from the supply pipe (12), passes the water through a labyrinthine channel (27) formed internally between the drip emitter (10) and the exterior wall of the supply pipe (12), and discharges the water from the internal channel at a greatly reduced pressure drop so that water drips at a slow rate. In one embodiment, the drip emitter (10) is bonded to the exterior wall of the irrigation supply pipe (12) by magnetic induction heating techniques. A region of fusible bonding material (38) is disposed around the outside boundary of the labyrinthine channel (27). The emitter (10) is placed over the supply pipe (12) so the fusible bonding material (38) overlies the exterior wall of the pipe (12), and the bonding material (38) is fused by magnetic induction heating techniques to weld the inside of the emitter (10), around the exterior of the labyrinthine channel (27), to the exterior wall of the pipe (12). |
