Liquid chromatograph with plunger structure

Abstract

The invention provides a liquid chromatograph with a plunger structure. The liquid chromatograph comprises a high pressure liquid pump. The high pressure liquid pump comprises two pump head components, two pump head seats, and one pump body. The pump body comprises two plunger components and two piston components with a piston rod. One end of the piston rod is provided with a taper hole. One end of the plunger component has a spherical surface and can be detachably installed in the taper hole. The sidewall of the taper hole is provided a plurality of positioning holes. Multiple positioning beads are embedded into the plurality of positioning holes. One end, which is provided with the taper hole, of the piston rod is sleeved by an elastic locking mechanism, the inner wall of the elastic locking mechanism presses the positioning beads, and the positioning beads press the spherical surface onto the taper bottom surface of the taper hole. The pump head seat is provided with at least two through holes. When the elastic locking mechanism is pushed and pressed through the through holes, the inner wall of the elastic locking mechanism is separated from the positioning beads. The plunger component can be simply and conveniently assembled and disassembled, at the same time, the realtime self-adaption of the plunger component can be achieved during the reciprocated movement, moreover, the wear is reduced, and the service life of the plunger component is prolonged therefore.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to a liquid chromatograph with a plunger structure. Background technique [0002] A liquid chromatograph generally consists of a high-pressure infusion pump, a liquid storage bottle, a sample injector, a chromatographic column, a detector, a waste liquid tank, and a data recording and processing device. One end of the high-pressure infusion pump is connected to the liquid storage bottle through a catheter, the other end is connected to the inlet of the sampler through a catheter, the outlet of the sampler is connected to the inlet of the chromatographic column through a catheter, and the outlet of the chromatographic column is connected to the detector through a catheter. The device is connected with the data recording and processing device through the data line. The working principle of the liquid chromatograph is: the mobile phase is installed in the liquid storage b...

AI Technical Summary

Problems solved by technology

[0005] The above structure has the following problems: when the plunger assembly 231 is worn and needs to be replaced, or the plunger assembly 231 needs to be maintained due to leakage of the sealing ring in the pump head cavity, it is necessary to remove other parts on the upper part of the high-pressure infusion pump, and open the upper part of the high-pressure infusion pump. machine cover, and use tools to loosen the spring 2323 acting on the split piston rod, and the plunger assembly 231 can only be taken out after the pump head assembly is removed. This operation is cumbersome and very unfavorable for maintenance

In addition, this plunger structure is in a fixed state after assembly. Although the plunger assembly 231 can be kept coaxial with each sealing assembly of the pump head assembly during assembly, it cannot be real-time during the reciprocating movement of the plunger assembly 231. The self-adaptation makes the plunger assembly 231 eccentrically wear the sealing ring, reducing the service life of the plunger assembly 231

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