| 摘要 |
<p>PURPOSE:To improve the security and the durability, by forming a high-speed swirling current in a part, which is opened to the outside air and has a large diameter, at one end of a guide hole of a horizontal water pressure chamber to shut water in the guide hole and thrusting a plunger to generate an impulsive water pressure. CONSTITUTION:A cylindrical guide hole 2 of a water pressure chamber 1 has a bottom 3 at one end and has the other end opened to the outside air, and a concentric cylindrical large-diameter part 6 having a diameter slightly larger than that of the guide hole 2 is provided at this opened end and is connected to the guide hole 2 by a conical part 5. A waterway 4 is provided in a bottom 3 and is connected to an external pressure receiving device 21, and plural spouts 7 are holed on the inside circumferential face of the large-diameter part 6 at equal intervals to ward the inside of the part 6 at an angle of 0-20 deg. to tangents drawn on the inside circumference of the part 6 and are connected to a water source 23. A water discharging chamber 9 having a larger diameter is provided at the opened end of the part 6, and an air aperture part 11 and a water discharging exit 10 are provided there. The tip, which should be thrusted into the guide hole 2, of a plunger 13 is formed into a smooth air dragging-in preventing part 14 having the radius of curvature smaller than the radius of curvature of the surface which is freely brought into conact with air of th swirling current flowed out from spouts 7 of the large-diameter part 6.</p> |
