| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enhance the followability of a diaphragm by a simple structure, and to prevent a liquid passing-through hole formed in a liquid storage tank from closing a large diameter disk part of the diaphragm even when the level of working liquid is dropped. <P>SOLUTION: A diaphragm 15 comprises a first expansion-contraction part 20 of bellows shape which is expanded-contracted in the axial direction of a liquid storage tank 4, a second expansion-contraction part 21 of a small diameter cylindrical shape which is formed continuous to the first expansion-contraction part 20 and expanded-contracted in the radial direction of the liquid storage tank 4, and a large diameter disk part 22 to close a lower end of the second expansion-contraction part 21. Three circumferential projections 23 are formed on a bottom surface 22a of the large diameter disk part 22 to prevent the bottom surface 22a of the large diameter disk part 22 from closing the liquid passing-through hole 16 when the first expansion-contraction part 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
