Plunger Pump for Fabricating Soft Capsules

Abstract

The present utility model provides a plunger pump for fabricating soft capsules, which plunger pump includes a switch body and a plunger body interconnected to each other, a rotary switch adapted to the switch body, and a plunger rod adapted to the plunger body. The switch body and the plunger body are connected to form an accommodation space, the switch body has a liquid suction hole and a liquid injection hole both communicative with the accommodation space, the plunger body has a channel for accommodating the plunger rod, and the rotary switch has a notch and is closely press-fit to the switch body to form a hermetic surface. It is possible to switch between the opening and the closing states of the liquid suction hole and the liquid injection hole. The plunger rod performs a linearly reciprocating movement in the channel so that the accommodation space periodically reaches a maximum value of capacity and a minimum value of capacity. The present utility model employs the structure of a rotary switch, which is sealed with zero gap, to switch between the opening and the closing states of the liquid suction hole and the liquid injection hole, whereby it is substantially free of leakage of medical solution and there is no mixing and dissolving with lubricating oil during normal operation of the plunger pump, to thereby enhance the precision in the loading amount and eliminate the problem of contamination of the medical solution by the lubricating oil.

Dependencies are inferred from the claim text.