| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a piston type pump to employ simple valve structure and be capable of making synthetic waveform of discharged (or emitted) fluid approximately constant. <P>SOLUTION: The piston type pump is provided with a cylinder; and an operation lever having a piston, and first and second suction valve means and first and second discharge valve means, having respectively intercommunicating valve containing parts, are coupled to a plurality of suction holes and discharge holes formed in the cylinder. Each valve containing part is internally provided with a magnetic valve element seating a magnetic valve seat in correspondence to polarity. When a pressure of fluid is increased to a value higher than the absorption force of a magnetic element due to sliding of a piston over the inside of a pressure chamber, the magnetic valve elements of the first suction valve means and the second discharge valve means are simultaneously separated away from the corresponding magnetic valve seat against an absorption force being magnetic absorption action and brought into an opened state. On the other hand, the magnetic valve element of each of the first discharge valve means and the second suction valve means displays the function of the check valve by a magnetic action. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
