| 摘要 |
<p>The dosage pump according to the invention comprises a cylinder (2), a piston (4) moving back and forth in it and openable and closable inlet (5) and outlet (6) opening in the piston-swept space (3). The opening and closing of the openings mentioned are carried out by an intermediate pipe (7) arranged movably, and with respect thereto tightly, between the cylinder (2) and the mantles of the piston (4). The transmission opening (8) of the intermediate pipe (7) is transferred by moving the intermediate pipe (7) upon the inlet (5) and the outlet (6) opening, the whole surface of the intermediate pipe always covering one of the inlet (5) and outlet (6) openings mentioned. The dosage pump mentioned can preferably be applied for the dosage of hard-flowing substances, e.g. for feeding solid catalyst or wax into olefin polymerization reactor.</p> |
