Corrosion-resistant ultra-trace metal impurity program-controlled injection pump system

Abstract

The invention relates to the field of fluid, in particular to a corrosion-resistant program-controlled injection pump system. The injection pump system consists of a syringe and a driving stepping motor thereof. Components in the system contacting with the fluid are all made of a high molecular material resistant to chemical corrosion (containing fluoroplastic, polypropylene, polyphenylene sulfide, polyetheretherketone or polyethylene and the like). The system is composed of at least a syringe with a channel, a driving stepping motor and a set of mechanical transmission components. The drivingstepping motor is programmed to achieve automated operation. Metal components in the system are enclosed in a box body made of a corrosion-resistant polymer material and are relatively isolated fromthe external environment so that the metal components are prevented from being corroded.

Description

technical field [0001] The invention relates to the field of fluids, in particular to a syringe pump system with chemical corrosion resistance, ultra-trace metal impurities and program control. Background technique [0002] Syringe pump systems are widely used in analytical chemistry, environmental science, chemical industry, environmental protection, food, clinical medicine and life sciences and other fields. The materials of the syringe barrels of the existing syringe pumps include glass, quartz, ceramics, metals, plastics, etc., and the materials of the pistons include glass, ceramics, rubber, and the like. Some special fluid application fields (semiconductor, geochemistry, life science, etc.) require fluid equipment to be resistant to strong chemical corrosion (nitric acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, etc.), and have ultra-trace metal impurities. Syringe pumps are difficult to meet the above requirements. Mainly because glass, quartz, ceramics,...

AI Technical Summary

Problems solved by technology

Some special fluid application fields (semiconductor, geochemistry, life science, etc.) require fluid equipment to have the ability to resist strong chemical corrosion (nitric acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, etc.), and at the same time have ultra-trace metal impurities. Syringe pumps are difficult to meet the above requirements

Mainly because it is difficult for glass, quartz, ceramics, and metals to meet strong chemical corrosion resistance. For example, hydrofluoric acid will corrode glass, ceramics, and metals, and will release traces of metal impurities in strong chemical corrosion media; rubber pistons in It will also be corroded in strong chemical corrosion medium, and at the same time release traces of metal impurities;

[0003] On the other hand, the metal parts of the driving stepper motor and mechanical transmission of the existing syringe pump system are exposed to the atmosphere of corrosive gas, not only easy to be corroded, but also there are potential trace metals in the volatile metal compounds formed Impurity pollution

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