High-precision automatic viscometer sample inlet unit and viscometer automatic sample injector

Abstract

The invention discloses a high-precision automatic viscometer sample inlet unit and an automatic viscometer sample injector. The high-precision automatic viscometer sample inlet unit comprises a sample injection needle guide unit, a three-way joint, a gas inlet screw and a sample injection pipe. An output port of the sample injection needle guide unit and a first interface of the three-way joint are arranged in a sealed manner, and the gas inlet screw and a second interface of the three-way joint are arranged in a sealed manner; and one end of the sample injection pipe is sealed with a third interface of the three-way joint, and the other end of the sample injection pipe is communicated with a sample injection port of a chromatographic instrument. According to the invention, the high-precision liquid sample inlet device matching the sample injection needle is arranged on a sample injection station; the high-precision liquid sample inlet device has the advantages that the sample injection requirement of the sample injection needle can be met; therefore, after each time of sample injection is completed, the device blows air to the device, so that residual samples can enter instrumentequipment, the cleanness of a sample injection pipeline is ensured, and the sample injection precision is greatly improved while a problem that an existing automatic sample injector does not match aninterface of sample injection equipment is solved.

Description

technical field [0001] The invention relates to the technical field of liquid sampling equipment, in particular to a high-precision automatic viscometer sampling port unit and a viscometer automatic sample injector. Background technique [0002] At present, most of the needle-type automatic sampling systems use the injection port of the chromatographic instrument as the sample injection device. When sampling, because the injection needle and the injection port cannot be directly connected, the method of quantitative pump injection is basically used for injection. However, due to the limitations of the quantitative pump itself, the use of quantitative pump injection often results in low precision and low standard deviation. In large cases, it will have a certain impact on the use effect, especially when the sampling accuracy is high, the use of ordinary quantitative pump sampling cannot meet the sampling requirements, and if the high-precision quantitative pump is purchased, ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the needle-type automatic sampling systems use the injection port of the chromatographic instrument as the sample injection device. When sampling, because the injection needle and the injection port cannot be directly connected, the method of quantitative pump injection is basically used for injection. However, due to the limitations of the quantitative pump itself, the use of quantitative pump injection often results in low precision and low standard deviation. In large cases, it will have a certain impact on the use effect, especially when the sampling accuracy is high, the use of ordinary quantitative pump sampling cannot meet the sampling requirements, and if the high-precision quantitative pump is purchased, the instrument However, the cost has increased significantly, so how to realize the cooperation between the existing needle-type automatic sampling system and the injection port of the viscosity tester is an urgent problem to be solved

[0003] Most of the existing viscosity testers use manual sampling methods, some of them use quantitative pump sampling, and the sampling steps do not fully meet the requirements of the national standard. There is no needle-type automatic sampling device in the market

Images