| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a push-down head designed to effectively apply a back-suction action so as to improve a spin-type nozzle in draining a liquid, and a discharge pump. <P>SOLUTION: The push-down head constituted of a head body 16 including a horizontal injection cylinder 22 opening at the front end thereof, a valve rod 50 inserted in the injection cylinder 22, a lever member 58 connected to the rear part of the valve rod 50, a throttle 30 of a contracting flow passage disposed on the inner face of the injection cylinder 22 at a position close to the axial front end of the cylinder, an on-off valve 52 formed by a valve seat 31 formed on the back face of the throttle and by the outer periphery of the front face of the valve rod 50, a supporting piece 38 installed in a spin chamber 34 which is a cylinder hole part of the injection cylinder disposed in front of the on-off valve 52, and a spin element 40 attached to the front face of the supporting piece 38 which spin element has a nozzle hole 46 opening at the center part thereof and a spin flow path 48 disposed on the back thereof, is characterized in that the flow path width of the ejection flow-path part in the spin chamber is made to get narrower from upstream to downstream. <P>COPYRIGHT: (C)2011,JPO&INPIT |
