Air-driven pump used for filling liquids

Abstract

The present invention provides an air-driven pump for liquid filling that can maintain a constant liquid discharge pressure regardless of the liquid temperature. [Solution] The air-driven pump 1 used for filling liquid according to the present invention comprises a drive unit 3, a liquid filling unit 5, at least one of an inflow liquid pressure transmitter 71 or an inflow liquid thermometer 73, and an inflow air pressure controller 9. The drive unit 3 comprises a drive cylinder 31 and a drive piston 33 disposed inside the drive cylinder 31. The drive piston 33 reciprocates due to the inflow of air from the air inlets 311a,b and the discharge of air from the air outlets 315a,b, and the liquid filling piston 53 reciprocates in accordance with the reciprocating motion of the drive piston 53. The inflow air pressure controller 9 controls the pressure of the air flowing into the air inlets 311a,b according to the data transmitted from at least one of the inflow liquid pressure transmitter 71 or the inflow liquid temperature transmitter 73.

Claims

[Claim 1] An air-driven pump for filling liquids, comprising a drive unit, a liquid filling unit, at least one of an inflow liquid pressure transmitter or an inflow liquid temperature transmitter, and an inflow air pressure controller, The drive unit comprises a drive cylinder having an air inlet and an air outlet, and a drive piston disposed inside the drive cylinder. The drive piston reciprocates due to the inflow of air from the air inlet and the discharge of air from the air outlet. The liquid filling unit comprises a liquid filling cylinder having a liquid inlet and a liquid outlet, and a liquid filling piston disposed inside the liquid filling cylinder. The drive piston and the liquid-filling piston are connected by a piston rod. As the drive piston reciprocates, the liquid-filling piston also reciprocates. The inflow liquid pressure transmitter or the inflow liquid temperature transmitter is provided upstream of the liquid inlet. The inflow liquid pressure transmitter transmits data on the pressure of the liquid flowing into the liquid inlet to the inflow air pressure controller. The inflow liquid temperature transmitter transmits data on the temperature of the liquid flowing into the liquid inlet to the inflow air pressure controller. The inflow air pressure controller is located upstream of the air inlet of the drive unit and controls the pressure of the air flowing into the air inlet according to data transmitted from at least one of the inflow liquid pressure transmitter or the inflow liquid temperature transmitter. Air-driven pump. [Claim 2] The air-driven pump according to claim 1, wherein the inflow air pressure controller is an electro-pneumatic regulator. [Claim 3] The aforementioned liquid is a liquid that liquefies when the pressure is higher than atmospheric pressure. The air-driven pump according to claim 1. [Claim 4] A liquid filling apparatus comprising an air-driven pump according to claim 1 or claim 2, a liquid container for storing the liquid to be filled, a filling container for filling the liquid to be filled, and an air compressor, The container to be filled with liquid and the liquid inlet are connected by a liquid inlet pipe. The filling container and the liquid discharge port are connected by a liquid discharge pipe. The air compressor and the inlet air pressure controller are connected by an air inlet pipe. Liquid filling equipment.

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