CN104807930A - Manual sampling aid for gas chromatograph - Google Patents

Abstract

The invention discloses a manual sampling aid for a gas chromatograph. The manual sampling aid comprises a syringe; an L-shaped needle head protecting sheet, a syringe fixing sleeve and an adjustable syringe core rod pushing sheet are correspondingly arranged on a needle head arranged on the syringe, a syringe body and a syringe core rod; a syringe inlet is formed in the front side of the syringe fixing sleeve; a core rod pushing sheet sliding chute and a needle head protecting sheet sliding chute are formed in the back side of the syringe fixing sleeve; the core rod pushing sheet sliding chute is positioned in the inner layer; the needle head protecting sheet sliding chute is positioned in the outer layer; a buckle for hanging the core rod pushing sheet is arranged at the lower end of the core rod pushing sheet sliding chute; a syringe front-end buckle and a syringe tail-end buckle are correspondingly arranged at two ends of the syringe fixing sleeve; a spring is arranged between the tail end of adjustable syringe core rod pushing sheet and the syringe fixing sleeve; an adjustable syringe core rod pushing sheet stuck point and a needle head hole are correspondingly formed in the upper end and the lower end of the needle head protecting sheet. The manual sampling aid disclosed by the invention has the advantages of simple structure, easiness for operation, low cost, good reproducibility and the like; the sampling effect of the manual sampling aid is nearly close to that of an automatic sampler.

Description

Gas Chromatograph Manual Sampling Aid

technical field

The invention belongs to the field of sample introduction of a gas chromatograph in the field of analytical chemistry, and in particular relates to a manual sample introduction assistant for a gas chromatograph.

Background technique

The development of gas chromatography technology has a history of half a century, and it is now a fairly mature and widely used method for the separation and analysis of complex mixtures. Gas chromatography belongs to column chromatography, which can be divided into packed column GC and capillary column GC according to the column. At present, most users use capillary column GC, but capillary column GC also has its limitations. Because of its small inner diameter, the column capacity is small, and the requirements for injection technology are higher. Generally, the injection volume of liquid samples is 1 μL to 2 μL. Conventional chromatographic sample injection methods include manual injection and automatic sampler injection. The characteristics of automatic sampling are automatic sampling, automatic needle washing, automatic sampling, and good reproducibility, so it can realize automatic analysis, reduce the labor intensity of analysts, and improve work efficiency. However, the autosampler is expensive, so many users do not deserve an autosampler. Even with automatic sampling devices, manual injection methods are often used when sample quantities are small. The manual injection method has the advantages of low cost and simple operation. The specific operation method of manual injection is that after sampling, hold the syringe with one hand (to prevent the needle shaft from being blown out by the high pressure in the gasification chamber), and protect the needle tip with the other hand (to prevent the needle tip from bending when inserting the septum), pass the injection needle through the septum, and randomly Insert the syringe to the end as quickly as possible, at the same time quickly inject the sample into the vaporization chamber, and then quickly pull out the syringe. Syringe insertion time and sample injection time directly affect the analysis results, however, manual injection method is difficult to maintain consistent injection speed for each sample, so the reproducibility is also poor. Therefore, proficiency in manual sampling techniques in gas chromatography directly affects the quality of the analysis results.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a simple structure, low price, convenient operation, easy to learn, can speed up the manual sampling speed, can prevent the sampling needle from bending, and can control the timing of sample injection. , can reduce injection discrimination and quantitative errors, and make the injection effect almost close to that of the gas chromatograph manual injection aid of the automatic sampler.

The object of the present invention is to realize like this: it comprises syringe, and the needle that syringe is provided with, syringe and syringe plunger are respectively provided with " L " shape needle protection sheet, syringe fixing sleeve and adjustable syringe plunger pusher piece, described The front side of the fixed sleeve of the syringe is provided with a syringe inlet, the back of the syringe fixed sleeve is provided with a chute for the plunger pusher and a chute for the needle protection sheet, the chute for the plunger pusher is on the inner layer, the chute for the needle protection sheet is on the outer The lower end of the rod push piece chute is provided with a buckle for the core rod push piece, and the two ends of the syringe fixing sleeve are respectively provided with a buckle for the front end of the syringe and a buckle for the end of the syringe, and the end of the push piece of the adjustable syringe core rod is fixed to the syringe A spring is arranged between the sleeves, and the upper end and the lower end of the needle protection sheet are respectively provided with adjustable syringe plunger pusher sheet clamping points and needle holes.

The adjustable syringe plunger pusher includes an "L" shaped plunger pusher arranged on the syringe plunger, a plunger pusher bracket is provided between the plunger pusher and the plunger pusher chute, and the plunger An adjustment screw is provided between the propulsion piece and the core rod propulsion piece support, and the two ends of the spring are respectively arranged on the core rod propulsion piece support and the fixing sleeve of the injection barrel.

Due to the above-mentioned technical scheme, the gas chromatograph manual sampling aid provided by the present invention has the following advantages: simple structure, low price, convenient operation, easy to learn, can speed up the manual sampling speed, can prevent the sampling needle from bending at the same time, and can control The timing of sample injection can reduce injection discrimination and quantitative error, so that the injection effect is almost close to that of an automatic sampler. Supporting the use of.

Description of drawings

Fig. 1 is a structural representation of the present invention;

FIG. 2 is a schematic diagram of the enlarged structure at A in FIG. 1 .

In the figure: 1. Needle, 2. Syringe barrel, 3. Syringe plunger, 4. Needle protection sheet, 5. Syringe barrel fixing sleeve, 6. Syringe inlet, 7. plunger pusher chute, 8. Needle protection chute, 9. plunger pusher buckle, 10. syringe front buckle, 11. syringe end buckle, 12. spring, 13. adjustable syringe plunger pusher buckle, 14. needle hole, 15. Core rod propeller, 16. Core rod propeller bracket, 17. Adjustment screw.

Detailed ways

As shown in Figure 1 to Figure 2, the gas chromatograph manual sampling aid provided by the present invention includes a syringe, and the needle 1, syringe 2 and syringe core rod 3 provided with the syringe are respectively provided with "L" shaped needle protection sheets 4. Syringe barrel fixing sleeve 5 and adjustable syringe plunger pusher piece, the front side of the syringe fixing sleeve 5 is provided with a syringe inlet 6, and the back of the syringe holder 5 is provided with a plunger pusher piece chute 7 and needle protection Chip chute 8, mandrel pushing piece chute 7 in the inner layer, needle protection piece chute 8 on the outer layer, the lower end of the core rod pushing piece chute 7 is provided with a core rod pushing piece buckle 9, and a syringe fixing sleeve 5 Both ends are respectively provided with a buckle 10 at the front end of the syringe and a buckle 11 at the end of the syringe, a spring 12 is provided between the end of the push piece of the adjustable syringe core rod and the fixing sleeve 5 of the syringe, the upper end of the needle protection sheet 4 and the The lower end is respectively provided with adjustable syringe plunger pusher points 13 and needle holes 14, and the adjustable syringe plunger pusher includes an "L" shaped plunger pusher 15 arranged on the syringe plunger 3, the plunger A core rod propelling plate support 16 is provided between the rod propelling plate 15 and the core rod propelling plate chute 7, and an adjusting screw 17 is arranged between the core rod propelling plate 15 and the core rod propelling plate support 16. The ends are respectively arranged on the core rod propulsion sheet support 16 and the syringe fixing sleeve 5.

In specific use, pull up the mandrel pusher bracket 16 and hang it on the mandrel pusher buckle 9, adjust the height of the mandrel pusher 15 according to the sample injection volume (1μL-2μL), place the syringe on the injector after inhaling the sample. When fixing the sleeve 5, the needle 1 is inserted into the needle hole 14 on the needle protection sheet 4, and the needle protection sheet 4 is pulled down to the bottom. Grasp the present invention by hand, align the needle tip with the chromatograph inlet, when the needle 1 of the syringe is inserted into the chromatograph inlet, push down quickly under the premise of erecting the present invention, the needle protection sheet 4 is in the needle protection sheet chute 8 Relatively move upwards, when the needle 1 is inserted to the bottom, the adjustable syringe plunger pusher card point 13 protruding from the upper end of the needle protection sheet 4 pushes the plunger pusher bracket 16, so that the plunger pusher bracket 16 is pushed from the plunger The chip buckle 9 falls off, and the core rod pusher bracket 16 and the core rod pusher piece 15 move down under the tension of the spring 12 to push the syringe core rod 3 to complete the sample injection. Finally, the injection needle 1 is pulled out quickly. The shorter the better.

Claims (2)

1. a gas chromatograph hand sampling assistor, it is characterized in that, it comprises syringe, the syringe needle that syringe is provided with, injection tube and syringe core rod are respectively equipped with " L " shape Tip protection sheet, injection tube fixed cover and adjustable syringe core rod impelling sheet, injector inlet is provided with on front side of described injection tube fixed cover, the syringe fixed cover back side is provided with core bar impelling sheet chute and Tip protection sheet chute, core bar impelling sheet chute is at internal layer, Tip protection sheet chute is at skin, core bar impelling sheet chute lower end is provided with hangs core bar impelling sheet buckle, syringe fixed cover two ends are respectively equipped with injection tube front end buckle and injection tube end buckle, spring is provided with between adjustable syringe core rod impelling sheet end and injection tube fixed cover, described Tip protection sheet top and bottom are respectively equipped with adjustable syringe core rod impelling sheet stuck point and syringe needle hole.

2. gas chromatograph hand sampling assistor according to claim 1, it is characterized in that, described adjustable syringe core rod impelling sheet comprises " L " core bar impelling sheet be located on syringe core rod, core bar impelling sheet support is provided with between core bar impelling sheet and core bar impelling sheet chute, be provided with positioning screw between core bar impelling sheet and core bar impelling sheet support, described both ends of the spring is located on core bar impelling sheet support and injection tube fixed cover respectively.