| 摘要 |
<p>The invention provides a cylinder pump (20) for an automatic chemical analyzer or the like, which comprises a cylinder (21) and a plunger (22) both made of a rigid material and coupled together in a liquid-tight sliding contact with each other without any elastic member such as an 0-ring interposed between the sliding contact surfaces, whereby to constitute a pump mechanism for withdrawing and discharging liquid, the sliding contact surfaces (23) being mirror-like surface. Ceramics are used as the rigid material of the cylinder (21) and plunger (22). Hence, the cylinder pump (20) has high discharge accuracy, long life and improved measurement precision.</p> |
