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Parallel liquid phase chromatographic pump

A liquid chromatography and parallel technology, which is applied in the direction of pumps, piston pumps, liquid displacement machinery, etc., can solve the problems of poor liquid pressure stability, difficult cam design, complex cam structure, etc., to achieve convenient cam processing and reduce industrial costs. Design Difficulty, Cam Curve Simple Effect

Active Publication Date: 2012-10-10
BEIJING PURKINJE GENERAL INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The invention aims to solve the technical problems that the design of the cam in the existing liquid chromatography pump is difficult, the cam structure is complicated, the processing is difficult, and the stability of the liquid pressure is poor.

Method used

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Embodiment Construction

[0044] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments described here are for illustration only, and are not intended to limit the present invention.

[0045] like Figure 4 , Figure 8 As shown, the cam 61 in the parallel liquid chromatography pump of the present invention is an end face cam, and its cam curve is arranged on the other end face opposite to the end face having the camshaft 60 . The cam curve includes a rising curve that can convert the rotational motion of the cam 61 into a uniform linear motion of the plunger 69, a falling curve that returns the plunger 69 to its original position, and a transition curve connecting the rising curve and the falling curve. A smooth transition line (not shown in the figure) is provided at the junction of the two curves. In order to improve the stability of the liquid pressure, trimming curves (not shown in the f...

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Abstract

The invention provides a parallel liquid phase chromatographic pump. The parallel liquid phase chromatographic pump comprises a cam with a camshaft, a pump head, at least two reciprocating fluid delivery mechanisms and a cam driving mechanism. The cam is an end cam. A cam curve comprises an ascending curve which can convert the rotating motion of the cam into the uniform linear motion of a plunger and a recession curve which enables the plunger to return in situ. Leads r of the ascending curve and the recession curve are both equal to 4v / npiD<2>, and a lead angle theta of the ascending curve is equal to 360 degrees / n, wherein v is the delivery volume of the parallel liquid phase chromatographic pump when the cam rotates a circle; D is the diameter of the plunger; n is the number of the plungers; and n is an integer of 2 to 10. A supporting roller has a conic shape and the ratio of the circumference of one of any two cross sections of the supporting roller to the perimeter of the cam curve at the corresponding position is equal to the ratio of the circumference of the other of any two cross sections of the supporting roller to the perimeter of the cam curve at the corresponding position. The parallel liquid phase chromatographic pump has a simple structure and high fluid pressure stability, and is easy to design and process.

Description

technical field [0001] The invention relates to a parallel liquid chromatographic pump for liquid chromatograph. Background technique [0002] The liquid chromatographic pump is one of the important components of the liquid chromatograph, and its performance directly affects the stability, repeatability and accuracy of the analysis. At present, the liquid chromatography pumps used for liquid chromatography mainly include 180° single-cam parallel liquid chromatography pumps, 120° single-cam parallel liquid chromatography pumps and 180° double-cam liquid chromatography pumps. [0003] like figure 1 As shown, the 180° single-cam parallel liquid chromatography pump includes a cam 51 installed on a camshaft 50 , two sets of reciprocating liquid feeding mechanisms and two pump heads 55 installed symmetrically around the circle of the cam 51 . Wherein the reciprocating liquid delivery mechanism includes a plunger push rod 53 supported on a housing (not shown in the figure) of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B9/04G01N30/36
CPCG01N30/16F04B9/042
Inventor 陆振宇
Owner BEIJING PURKINJE GENERAL INSTR
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