| 摘要 |
PURPOSE:To enhance accuracy in discharging by making a plunger in a multiple construction with different shaped cylinders fitted one on another, in the intension to widen the discharge rate range, and by putting a plunger with the optimum diameter for the discharging rate in operation at the time of sending liquid. CONSTITUTION:In No.1 plunger 10 in cylindrical form, one end of No.2 plunger 15 with the form of a cylinder having smaller diameter than No.1 plunger is fitted in alignment in such a way as possible to advance and retract freely in the axial direction, where liquid tightness is secured by a packing box 16 formed at the other end of No.1 plunger 10. Thus the plungers are formed in a multiple construction, where each plunger 10, 15 is operatable independently, and No.2 plunger 15 with minor diameter is used solely for sending small amount of liquid while both plungers 10, 15 are used for sending a large amount, so that the discharge rate range can be widened and discharge accuracy enhanced. |
