CN103376296A - Oil chromatographic analysis standard sample injector - Google Patents

Abstract

The invention discloses a standard sample injector for oil chromatographic analysis, which is composed of a syringe barrel, a syringe push rod, a syringe needle and a fixed support, wherein the fixed support includes a fixed plate, a control plate, an upper baffle plate and two connecting plates. A screw and a fixing nut, the fixing plate is fixed on the syringe barrel, the top of the syringe push rod is provided with an upper baffle, the upper baffle and the fixing plate are connected by two screws, and an upper baffle nut is arranged on the top of the upper baffle; A control plate is also arranged between the upper baffle plate and the fixed plate, the control plate passes through the above-mentioned screw rod, and the position and positioning are adjusted by the control plate nut arranged at the bottom of the control plate.

Description

Oil Chromatography Standard Injector

technical field

The invention relates to an auxiliary tool when using insulating oil chromatographic analysis, in particular to a tool for gas sampling during chromatographic analysis.

Background technique

Insulating oil chromatography is a diagnostic technique for condition assessment of oil-filled equipment. It provides effective insulation supervision for electrical equipment to ensure the safe and stable operation of electrical equipment. Specifically, gas chromatography is used to measure the component content of dissolved gas in insulating oil. The measurement results are used by power supply companies to judge whether there are latent overheating, discharge and other faults in the oil-filled power equipment in operation, so as to ensure the safe and effective operation of the power grid. This is also It is a necessary means for oil-filled electrical equipment manufacturers to carry out factory inspection of their equipment. The requirements of GB/T7252-2001 for chromatographic analysis test data are: the analysis results of multiple injections of the same gas sample should be within ±1.5% of the average value.

The structure of the injector currently used is a common 1ml medical glass syringe. During the chromatographic test, according to the requirements, the intake volume should be kept at 0.5ml. For the old sampler, it can only rely on the personal operation of the tester when taking gas. The injection volume is not easy to control, and errors will inevitably occur, which will affect the accuracy of the test data. After focusing on the analysis of the sampling process of the injector, it was found that the main reason for the poor repeatability is that the gas sampling and intake cannot be accurately quantified. Moreover, during the injection process of the injector, due to the certain pressure in the injection port of the chromatograph, about 0.2Mpa, it is easy to eject the core of the injector, resulting in the failure of the test operation and the inability to accurately quantify as required.

In addition, the needle hole used in the injector is relatively small. Since the injection pad of the injection port is made of silica gel, the needle often touches the injection pad when injecting samples, which is easy to cause blockage, resulting in failure of normal use, and frequent replacement of the needle. , affecting work efficiency.

Contents of the invention

In order to solve the existing problems, the present invention provides a standard injector for oil chromatographic analysis with accurate and quantitative gas collection and air intake, and which can work normally even if the needle is blocked.

In order to solve the above problems, the present invention adopts the following technical solutions:

A standard injector for oil chromatographic analysis, consisting of a syringe barrel, a syringe push rod, a syringe needle and a fixed bracket, wherein the fixed bracket includes a fixed plate, a control plate, an upper baffle plate, two screws connecting the above three plates and a fixed nut, the fixing plate is fixed on the syringe barrel, the top of the syringe push rod is provided with an upper baffle, the upper baffle and the fixing plate are connected by two screws, and an upper baffle nut is arranged on the top of the upper baffle; A control plate is also arranged between the fixed plate, and the control plate passes through the above-mentioned screw rod, and the position and positioning are adjusted by the control plate nut arranged at the bottom of the control plate.

Further, the fixed plate, the control plate and the upper baffle are all made of transparent organic glass, and one side of the upper baffle is provided with an arc-shaped groove.

In addition, the syringe needle is provided with a bypass hole.

The positive effect of the present invention is that, firstly, the accuracy of air extraction and air intake is guaranteed; secondly, it is ensured that the syringe push rod will not be pushed out due to the air intake pressure; thirdly, the bypass hole of the needle realizes even The test can also be continued with a blocked needle.

Description of drawings

Fig. 1 is the sectional view of oil chromatographic analysis standard sampler of the present invention;

Fig. 2 is the top view of Fig. 1;

FIG. 3 is a detailed view of the injector needle of FIG. 1 .

In the figure: 1-syringe barrel, 2-syringe push rod, 3-syringe needle, 4-fixed plate, 5-control board, 6-upper baffle, 7-screw, 8-upper baffle nut, 9-control board Nut, 10-bypass hole

Detailed ways

The present invention will be described in detail below in conjunction with accompanying drawings 1-3.

Referring to Fig. 1, the oil chromatography analysis standard sampler of the present invention is made up of syringe cylinder 1, syringe push rod 2, syringe needle 3 and fixed support, wherein fixed support comprises fixed plate 4, control plate 5, upper baffle plate 6 and connecting The screws and fixing nuts of the above three plates, the fixing plate is fixed on the syringe barrel 1, and the top of the syringe push rod 2 is provided with an upper baffle 6. Since the inlet of the chromatograph has a certain pressure, the upper baffle 6 ensures The syringe push rod 2 will not be ejected under the action of the pressure gas, which avoids the risk of operation failure. The upper baffle 6 and the fixed plate 4 are connected by two screws 7, and the upper baffle nut is set on the upper part of the upper baffle 6. fixed.

In addition, a control board 5 is also arranged between the upper baffle plate 6 and the fixed plate 4. The control board 5 also passes through the above-mentioned screw rod 7, and the position and positioning are adjusted by the control board nut 9 arranged at the bottom of the control board 5. By adjusting The position of the control panel 5 can make the gas sampling rate of the sampler meet the requirements accurately. After several tests, the results show that each gas recovery and intake volume meet the standard requirements. The above-mentioned fixed plate 4, control plate 5 and upper baffle plate 6 are all made of transparent plexiglass material, which can facilitate the whole process of observation experiment.

Referring to Fig. 2, in order to facilitate the manual operation of the syringe push rod 2, an arc-shaped groove is arranged on one side of the upper baffle plate 6, through which the experimenter performs manual operation to conveniently realize the functions of gas collection and air intake.

Figure 3 is a detailed view of the needle 3. The needle hole of the needle 3 used in the sample injector is relatively small, and the injection pad of the chromatograph is made of silica gel. It is easy to be blocked due to contact with the silica gel pad during the air intake operation. Another bypass hole 10 is opened beside the needle, so that the bypass hole 10 does not contact the front side of the silica gel, even if the needle hole is blocked, the air intake will not change, which ensures the accuracy of the chromatographic analysis test data.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (3)

1. A standard injector for oil chromatographic analysis, consisting of a syringe barrel, a syringe push rod, a syringe needle and a fixed bracket, wherein the fixed bracket includes a fixed plate, a control plate, an upper baffle plate and two screw rods connecting the above three plates and the fixing nut, the fixing plate is fixed on the syringe barrel, the top of the syringe push rod is provided with an upper baffle, the upper baffle and the fixing plate are connected by two screws, and an upper baffle nut is arranged on the top of the upper baffle; its characteristics In that, a control plate is also arranged between the upper baffle plate and the fixing plate, the control plate passes through the above-mentioned screw rod, and the position is adjusted and positioned by the control plate nut arranged at the lower part of the control plate. 2. oil chromatographic analysis standard sample injector according to claim 1, is characterized in that, described fixed plate, control plate and upper floor baffle are all transparent plexiglass materials, and one side of described upper floor baffle is provided with Curved groove. 3. The standard injector for oil chromatography analysis according to claim 1 or 2, characterized in that the syringe needle is provided with a bypass hole.

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