High-pressure injection pump and injection pump system

Abstract

The invention discloses a high-pressure injection pump and an injection pump system. The high-pressure injection pump comprises a motor, a speed reducer is adapted to the motor, an output shaft of thespeed reducer is connected with a lead screw, a nut is adapted to the lead screw, and the nut is fixedly connected with a sliding body; and the front end of the sliding body is connected with a plunger rod seat, a pump body used for storing liquid is arranged in the front side of the plunger rod seat, a plunger rod is arranged in the pump body, the rear end of the plunger rod is arranged on the plunger rod seat, a flow path part used for liquid flowing is arranged at the front end of the pump body, and a liquid conveying port is formed in the side wall of the flow path part. According to thehigh-pressure injection pump and the injection pump system, the structure is simple, the layout is reasonable, the pump body of each high-pressure injection pump is independently provided with the corresponding motor and speed reducer, the motor drives the lead screw to realize operation of the pump system, the whole liquid conveying and feeding process is more constant, and the occupied space andthe production cost are reduced.

Description

technical field [0001] The invention relates to the technical field of injection pumps, in particular to a high-pressure injection pump and an injection pump system. Background technique [0002] High-pressure syringe pumps are widely used in analytical instruments such as high-performance liquid chromatography, mass spectrometer, and pulse spectrometer. It is required that the high-pressure syringe pump can achieve pulsation-free transmission and be able to work under high-pressure conditions during the liquid delivery process. [0003] Most of the high-pressure syringe pumps currently on the market have a flow range between micro and milliseconds, and are generally cam pumps, which are composed of four parts: a motor system, a cam system, a push rod system and a flow system. The motor system It is not directly connected with the cam system, but relies on the synchronous belt to drive the rotation of the cam. This high-pressure syringe pump mainly has the following disadva...

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Problems solved by technology

[0004] (1) Since the motor system is not directly connected to the cam system, the rationality of its position needs to be considered during the design process, which will have a certain impact on the overall design layout;

[0005] (2) Although the curve of the cam determines whether the high-pressure injection pump can have a constant flow, there will be a certain offset during the entire cam operation process, which will bring certain errors to the operation results;

[0006] (3) Existing high-pressure injection pumps are difficult to achieve accurate measurement and stable delivery of ultra-fine flow, and the range is relatively single and the span is not large enough;

[0007] (4) The speed and flow are unstable during the overall operation

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