High pressure solvent delivery pump and minitype high pressure solvent delivery pump system

Abstract

The invention discloses a high pressure constant-flow solvent delivery pump for a liquid chromatograph. The high pressure solvent delivery pump comprises a primary pump ball screw, a secondary pump ball screw, a primary piston, a secondary piston, a primary plunger rod, a secondary plunger rod, a primary pump head and a secondary pump head. One end of the primary pump ball screw and one end of the secondary pump ball screw are in linkage through a gear. A nut of the primary pump ball screw is arranged inside the primary piston and is fixedly connected with the primary piston. A nut of the secondary pump ball screw is arranged in the secondary piston and is fixedly connected with the secondary piston. The primary piston and the primary plunger rod are connected, and the secondary piston and the secondary plunger rod are connected. One end of the primary plunger rod penetrates through the bottom of the primary pump head and is inserted into a plunger cavity; one end of the secondary plunger rod penetrates through the bottom of the secondary pump head and is inserted into a plunger cavity. The primary plunger rod and the secondary plunger rod move in the opposite directions. The output port of the primary pump head is communicated with the inlet of an input one-way valve of the secondary pump head. The invention further provides a minitype high pressure solvent delivery pump system. The microcomputer all-digital control is adopted, the movement positioning precision is high, controllability is high, flexibility is high, the size is small, and the flow change range is wide.

Description

technical field [0001] The invention relates to a liquid chromatograph, in particular to a miniature high-pressure transfusion pump system adopted by the liquid chromatograph. Background technique [0002] At present, most of the infusion pumps of liquid chromatographs use a cam to drive the movement of the plunger rod. The movement precision of the plunger rod is low, and the movement law depends on the cam curve. However, the cam curve is finalized after metal processing, and only one state can be simulated to obtain the best results. However, there are many changing parameters of the infusion pump, such as: the flow rate setting value of the pump, the real-time pressure, and the compressibility of the liquid. Therefore, the cam pump cannot achieve constant flow infusion under various working conditions. Many imported instruments use screw-driven infusion pumps, but most of them are heavy in structure, large in size, and poor in shock resistance, which limits the use of ...

AI Technical Summary

Problems solved by technology

Therefore, the cam pump cannot achieve constant flow infusion under various working conditions

Many imported instruments use screw-driven infusion pumps, but most of them are heavy in structure, large in size, and poor in shock resistance, which limits the use of infusion pumps in vehicle-mounted and portable instruments

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