Liquid chromatography high-pressure series-wound cam pump

Abstract

The invention discloses a liquid chromatography high-pressure series-wound cam pump, which comprises a motor, a pump main body, a main pump head, an auxiliary pump head, a cleaning block, a cam shaft, a main cylindrical cam, an auxiliary cylindrical cam, and a reciprocating liquid delivering mechanism, wherein a sealing rings is arranged between the main pump head and a plunger and between the auxiliary pump head and the plunger; a compression spring is sleeved outside a plunger backseat; the main cylindrical cam and the auxiliary cylindrical cam are N-phase cylindrical cams, namely N groups of cam curves are uniformly formed on the outer circumferences of the main cylindrical cam and the auxiliary cylindrical cam respectively, N is an integer more than or equal to 2, and each group of the cam curves comprises ascending curves and descending curves; and the sum of the angle corresponding to one of the ascending curves of the main cylindrical cam and the angle corresponding to one of the ascending curves of the auxiliary cylindrical cam is 360 / N. Under the condition that the liquid supply quantity, the motor rotating speed and the movement velocity of the plunger are kept unchangedin use, the to-and-fro movement frequency of the plunger is improved, and the pressure fluctuation of the liquid chromatography high-pressure series-wound cam pump in work can be reduced.

Description

technical field [0001] The invention relates to a liquid chromatography high-pressure serial cam pump used for a liquid chromatography instrument. Background technique [0002] Existing high-pressure tandem pumps for liquid chromatography, such as figure 1 As shown, it includes: motor, pump main body 1, main pump head 2 and auxiliary pump head 3 fixedly connected with pump main body 1, two cleaning blocks 4, camshaft 5 connected with motor, camshaft 5 fixedly connected The main cylindrical cam 6 and the auxiliary cylindrical cam 7, two sets of reciprocating liquid feeding mechanism with the same structure, the main cylindrical cam 6 is connected with the main pump head 2 through a set of reciprocating liquid feeding mechanism, and the auxiliary cylindrical cam is connected through another set of reciprocating liquid feeding mechanism Connected with the auxiliary pump head 3; the reciprocating liquid delivery mechanism includes a plunger push rod 8, a plunger back seat 9 and...

AI Technical Summary

Problems solved by technology

Regardless of whether the plunger deviates from the origin or returns to the origin, the whereabouts and source of the radial force are the sealing ring, and the sealing ring is bearing the extra radial force brought by the plunger, which is reducing the normal force of the sealing ring. service life

[0005] Obviously, a pump with large pressure fluctuations and poorly controlled plunger movement trajectory cannot bring stable flow and high detection accuracy to the detection system.

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