JPS6238364A - Liquid automatic sampler - Google Patents

Abstract

PURPOSE:To simplify the structure of a device and to improve the position precision by sucking and discharging liquid into and from a sample vial bottle, a cleaning bottle, a sample injection part, etc., only by driving a microsyringe upward and downward. CONSTITUTION:The sample vial bottle 7, cleaning liquid bottle, and an opening part 14 are arrayed on a sample plate 6 and rotated to position them right below the microsyringe 15. Further, the sample injection part 12 is provided right under the microsyringe 15 and liquid is sent to a chromatograph 13. Further, the microsyringe 15 is driven upward and downward by an up/down driving mechanism 5 and a plunger 1 is driven by an up/down driving mechanism 4. Then the sample vial bottle 7 is rotated to right under the microsyringe 15 and positioned to suck a sample. Then, the opening part 14 is rotated and positioned right below it and the microsyringe 15 is lowered below the opening part 14 to inject the sample into the sample injection part 12. Further, the cleaning liquid bottle and a waste liquid dish 9 are also operated similarly to suck and discharge the liquid. Thus, the microsyringe is driven upward and downward, so the structure is simplified and position precision is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to improvements in liquid autosamplers for, for example, gas chromatographs.

[Background of the invention]

In conventional liquid autosamplers, the microsyringe must move between the sample vial pin on the sample tray and the sample injection part on a plane parallel to the floor, and the arm that holds the microsyringe must move perpendicular to the floor. This required a mechanism that could be attached to a rotating shaft for swinging motion, or could be moved from side to side on a rail between the two. For this reason, there are many movable parts, which is uneconomical, and furthermore, it is necessary to stop the microsyringe directly above both with good reproducibility, which has the disadvantage that positional accuracy is difficult to achieve. and.

There were also drawbacks, such as the large size and weight of the device.

[Purpose of the invention]

The present invention was made in view of the above situation, and an object of the present invention is to provide a liquid autosampler that has a simple structure and can improve positional accuracy.

[Summary of the invention]

The liquid autosampler of the present invention has a microsyringe that reciprocates a plunger in a barrel to which a needle is attached, and sucks and discharges a sample and a washing liquid into the barrel through the needle. The barrel is formed so that suction and discharge are automatically performed via a control device between the sample vial, the cleaning liquid bottle, the sample injection part, and the drainer, and the above-mentioned sample disposed on the sampler base. The microsyringe is formed at the upper center of the sample injection part so that the barrel and the plunger are individually driven up and down, and the microsyringe is located on the same circumference around the rotation center of the sample tray on the sampler base. 1 each
The microsyringe is provided with holes and openings for the sample vial and the washing liquid bottle, and means for forming the drainer so as to be freely displaceable below the center of the microsyringe. .

[Embodiments of the invention]

Hereinafter, the liquid autosampler of the present invention will be described in detail using Examples.
This will be explained using figures. FIG. 1 is a partially sectional front view. In the figure, 15 is a microsyringe, which consists of a plunger 1, a barrel 2, and a needle 3. 4 is a plunger vertical mechanism that drives the plunger 1 up and down, and 5 is a microsyringe vertical mechanism that drives the microsyringe 15 up and down.

6 is a sample tray, 7 is a sample vial,
The following description will include a cleaning liquid bottle (not shown) whose contents are different from those of the sample and cleaning liquid. 8 is a drainer moving mechanism that moves the drainer 9. 10 is a motor, 11 is a sampler base, 12 is a sample injection part, 13 is a gas chromatograph,
14 is Taguchibe. A sample injection unit 12 is attached to the opening of the sampler base 11 on the gas chromatograph 13, and a liquid autosampler is installed on the sampler base 11. The sample tray 6 has holes 1G formed so that a plurality of sample vials 7 can be fitted therein as shown in the figure.
and one or more openings 14 are provided concentrically with the center of rotation, and the sample tray 6 is rotated by a motor 10.

The microsyringe 15 is arranged above the central axis of the sample injection section 12, and the opening 14 and the hole 16 are rotatable to positions above the central axis of the sample injection section 12, that is, at the bottom of the microsyringe 15. It is formed. Further, a drainer 9 is formed on the same central axis as the sample injection section 12 and is movable by a drainer moving mechanism 8 . and,
The microsyringe 15 moves up and down to suck and eject the sample and washing liquid, and the sample tray 6 is driven by the motor 10 and rotates, and the opening 14 and sample vial 7 are rotated directly above the sample injection part 12 and then stopped. In addition, each operation of displacing the drainer 9 to the position directly above the sample injection part 12 by the drainer moving mechanism 8 is automatically controlled and performed by a control device W (not shown). It has become. The motor 10, the sample tray 6, etc. form means for moving the opening 14 and the sample vial 7 to the same center axis position as the sample injection section 12, and the drainer moving mechanism 8 moves the drainer 9 to the sample vial 7. A means for moving the injection part 12 to the same central axis position is formed.

FIG. 2 is an explanatory diagram of suction and discharge of sample cleaning liquid by the microsyringe 15, and will be explained by (a) to (u). (A) shows the state at the start of the cleaning process, and the sample vial 7 contains the solvent of the cleaning liquid at this time. Then, the microsyringe 15 is lowered by the microsyringe up/down mechanism 5 as shown in (B), the needle 3 of the microsyringe 15 sticks into the sample vial 7, and the solvent is sucked in as shown in (C). The up-and-down mechanism 5 moves it upward to the position (d). Then, the sample tray 6 is rotated by the motor 10 and the opening 14 is opened to the sample injection part 1 as shown in (d).
At the same time, the drainer 9 is displaced to a position directly above the microsyringe 15 by the drainer moving mechanism 8. Next, as shown in (E), the microsyringe 15 is lowered and the plunger 1 is lowered by the plunger up/down mechanism 4, and the solvent is discharged into the drainer 9 as shown in (F), and the cleaning process is completed by the above operations. do.

The sample inhalation process is in the starting state (a).

At this time, the sample vial 7 is filled with the sample, the sample tray 6 is rotated directly above the sample injection part 12, the sample vial 7 is stopped, and then (b)
, (c), after inhaling the sample, the microsyringe 15 is raised upward. Next, the sample tray 6 is rotated so that the opening 14 is directly above the sample injection part 12 as shown in (G), the microsyringe 15 is lowered as shown in (H), and the plunger 1 is lowered as shown in (S). The sample is discharged into the sample injection part 12, and then the sample is discharged into the microsyringe 1.
5 is raised upward as shown in (nu). In the state shown in (6), the microsyringe 15 is unwashed,
Cleaning is performed in the order described above. Each of these operations is automatically controlled and performed via a control device. Therefore, the microsyringe 15 does not require any swinging or sliding motions as in the prior art, and requires only a simple vertical movement, has a simple and economical structure, and has excellent positional accuracy.

In this way, the liquid autosampler of the present embodiment has a simple structure because the microsyringe is moved up and down to the sample injection part, and the sample vial and drainer are disposed directly below the microsyringe. Position accuracy can be significantly improved.

〔Effect of the invention〕

As described above, the liquid autosampler of the present invention has the effect of improving positional accuracy with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of an embodiment of the liquid autosampler of the present invention, and FIGS. 2(a) to 2(a) are explanatory views of the operation of the apparatus shown in FIG. 1, respectively. 1... Plunger, 2... Barrel, 3... Needle, 6
...Sample tray, 7...Sample vial, 8
... Drainer moving mechanism, 9... Drainer, 10... Motor, 11... Sampler base, 12... Sample injection part, 14... Opening, 15... Micro Syringe,
16...hole.

Claims (1)

[Claims] 1. It has a microsyringe that reciprocates a plunger in a barrel to which a needle is attached, and sucks and discharges the sample and washing liquid into the barrel through the needle, and the sample and washing liquid are transferred between the barrel and the sample vial. The center of the sample injection section disposed on the sampler base is formed so that suction and discharge are automatically performed via a control device between the bottle, the cleaning liquid bottle, the sample injection section, and the drain pan. The microsyringe is formed at an upper position so that the barrel and the plunger are individually driven up and down, and one or more of each are arranged on the same circumference around the rotation center of the sample tray on the sampler base. A liquid characterized by comprising holes and openings for the sample vial and the cleaning liquid bottle, and respective means for forming the drain pan movably below the center of the microsyringe. Auto sampler.