Piston pump and filling machine for liquid medicine with rotary valve

Abstract

The invention relates to a piston pump with a rotating valve. The piston pump comprises a pump body, a piston arranged at a first end of the pump body and capable of performing a reciprocating motion in the pump body, the rotating valve arranged at a second end of the pump body and capable of rotating in the pump body, a first channel and a second channel formed in the pump body and capable of communicating with a pump chamber through the rotating valve, and a flushing cup fixedly arranged at one end, exposed from the pump body, of the piston, wherein the pump chamber is defined by the pump body, the piston and the rotating valve; and when the piston is totally pushed into the pump body, one part of the pump body is inserted in the flushing cup. The piston pump is characterized in that a third channel, leading to the flushing cup, is formed in the bottom of the flushing cup or in the side wall, near the bottom, of the flushing cup; and the third channel can communicate with a solvent source through a first pipe connected with the third channel. The invention further relates to a liquid medicine filling machine including the piston pump. According to the piston pump, the filling machine is smooth in operation, and the medicine filling efficiency of the filling machine can be prominently improved.

Description

technical field [0001] The invention relates to the filling of liquid medicine, in particular to a piston pump with a rotary valve and a liquid medicine filling machine comprising the piston pump with a rotary valve. Background technique [0002] In the pharmaceutical industry, filling machines are often used to fill liquid medicines into containers such as ampoules or vials. The filling machine has multiple piston pumps with rotary valves. figure 1 is a simplified schematic diagram of an existing piston pump with a rotary valve, where the piston is in the uppermost position in the pump body. figure 2 With figure 1 A similar schematic, where the piston is in the lowermost position in the pump body. Such as figure 1 and 2 As shown, the piston pump 1 with a rotary valve includes a pump body 3, a piston 5 arranged at one end of the pump body 3 (the lower end of the pump body 3 in the figure) and capable of moving back and forth in the pump body 3, and a piston 5 arranged ...

AI Technical Summary

Problems solved by technology

Replacing the solvent is not only very troublesome, but also leads to a significant decrease in the filling efficiency of the filling machine

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