JPH0425515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a needle sealing device for a liquid sampling container, and more specifically, the present invention relates to a device for sealing a needle portion of a liquid sampling container, and more specifically, it is a device for sealing a needle portion of a liquid sampling container, and more specifically, it is a device for sealing a needle portion of a liquid sampling container, and more specifically, it is a device for sealing a needle portion of a liquid sampling container. The present invention relates to a needle sealing device that is capable of collecting a certain amount of sample solution necessary for analysis into a jag with high accuracy. Conventionally, when sampling liquids such as radioactive solutions or solutions containing toxic substances such as cyanide and halogens, the sample solution is sampled using the normal sampling method to prevent biological exposure from radioactivity or poisoning from toxic substances. For example, when sampling radioactive solutions, a sampling container 1 as shown in Figure 1 is placed in a box (usually called a sampling bench) surrounded by a lead shield. The radioactive solution is transferred from the storage tank into this container 1 through the liquid supply port 6 by air lift, vacuum suction, etc., and is discharged from the liquid discharge port 7. On the other hand, using a manipulator or tongs installed in the sampling bench, the stopper 3 of the jig is inserted into the hollow needle 4 of the sampling container 1, and sampling is performed based on the difference in the degree of vacuum between the sampling container 1 and the jig 2. Needle 4 in container 1
The radioactive solution was sucked into JAG 2 through the tube. In this conventional radioactive solution sampling method, in order to prevent the radioactive solution remaining in the needle 4 and the radioactively contaminated air used for airlifting the radioactive solution from leaking to the outside of the sampling container 1, , sampling container 1
The pressure inside the sampling container is maintained at a negative pressure than the pressure outside the sampling container, that is, the pressure inside the sampling bench, and air is always sucked into the sampling container 1 through the needle 4 until the needle 4 is inserted into the stopper 3 of the jag 2. I was doing it. However, if air is constantly being sucked through the needle 4, the air will be sucked into the liquid reservoir 5 of the sampling container 1 in the form of bubbles.
When a solution of It becomes difficult to aspirate and secure the liquid into the jug 2, and the amount of liquid suctioned into the jug 2 fluctuates, causing problems in analysis. Therefore, the present invention was made to eliminate such conventional drawbacks, and since it is possible to prevent air bubbles from being entrained when the solution is sucked from the sampling container 1 through the needle 4 into the jag 2, a constant amount of solution can always be drawn. It has features such as being able to collect with high precision and improving analysis precision. That is, the needle sealing device for a liquid sampling container of the present invention has a liquid supply port and a liquid discharge port in the container body, and a hollow needle for sampling that extends from the container body through the container wall to the outside of the container body. In the attached liquid sampling container, an outer cylinder or an inner cylinder is provided so as to surround the hollow needle extending outside the container body, and the inner cylinder or outer cylinder having a sample bottle receiving opening at the tip is attached to the outer cylinder or the inner cylinder. The sample bottle is slidably positioned via an elastic member, and when the sample bottle receiving opening is pressed against the rubber stopper of the sample bottle, a sealed space is formed by the rubber stopper, the outer cylinder, the inner cylinder, and the container body. This is characterized by the fact that the The present invention will be described below based on embodiments shown in the drawings. FIG. 2 shows a first embodiment of the present invention.
As shown in the figure, in a liquid sampling container 1 in which a liquid supply port and a liquid discharge port are provided in the container body, and a hollow needle 4 penetrating the container body is attached, the needle 4 penetrating the container body is surrounded. An outer cylinder 12 is fixed to the sampling container 1 via a pedestal 16, and an inner cylinder 13 is provided on the inner surface of the outer cylinder 12 so that the outer surface of the inner cylinder 13 can come into contact with and be inserted. In addition, a jig receiving opening 1 is provided at the tip of the inner cylinder 13.
4 and a stopper 15 are formed, and an elastic material such as a spring 17 is provided between the stopper 15 and the base 16 along the inside of the inner cylinder 13. This spring 17 functions as a return mechanism that returns the pushed inner cylinder 13 to its original position when the inner cylinder 13 is pushed in by the jag 2. Although cylinders are usually used as the inner cylinder 13 and the outer cylinder 12, they are not limited to this.
A rectangular tube having a triangular, square, or hexagonal cross section can also be used. In addition, a sealed space 18 is provided at the contact surface between the inner cylinder 13 and the outer cylinder 12 to facilitate sliding, and as will be described later.
In order to improve airtightness, it is preferable to apply a sealing agent such as silicone grease. The jig receiving opening 14 is flat and has no irregularities so that it can be brought into close contact with the rubber stopper 3 of the jig 2. Further, the size of the jag receiving port 14 may be any size as long as it can receive the rubber stopper 3. FIG. 3 shows a second embodiment of the present invention, in which the first
Contrary to the embodiment, the inner cylinder 13 is fixed to the sampling container 1 via the pedestal 16.
A stopper 15 is provided on the outer cylinder 12 that is inserted in contact with the outer surface of the pedestal 1.
A spring 17 is installed as an elastic material between the spring 6 and the spring 6. FIG. 4 shows a third embodiment of the present invention, in which a metal bellows 19 is used as a resilient member instead of a spring. The metal bellows 19 not only serves as a return mechanism for the outer cylinder 12, but also serves as a return mechanism for the outer cylinder 12 and the metal bellows 1.
9 and the pedestal 16 form a closed space 18. This third embodiment is preferable to the apparatus in which a sealing agent such as silicone grease is preferably applied to the sliding surfaces of the inner cylinder and the outer cylinder to form a sealed space as in the first and second embodiments. Since the bellows can provide a more airtight seal, air leakage from the sealed space 18 can be more reliably prevented. Next, the function of the container of the present invention will be explained based on FIGS. 1 and 2. For example, a radioactive solution is transferred to the sampling container 1 by vacuum suction and/or air lift, and is injected into the container 1 from the liquid supply port 6, passes through the liquid reservoir 5, and flows out from the liquid outlet 7. At this time, in order to prevent the gas and liquid in the sampling container 1 from leaking out of the sampling container 1,
The pressure inside the sampling vessel 1 is kept lower than the pressure outside the vessel 1, so that the hollow needle 4
Air outside the container 1 is sucked into the container 1 through. At this time, if you press the rubber stopper 3 of the jig 2 into the jig receiving port 14 at the tip of the inner cylinder 13,
The jag receiving port 14 is in close contact with the rubber stopper 3 to form a sealed space 18 consisting of the rubber stopper 3, the inner tube 13, the outer tube 12, and the base 16. Then, when the air in the closed space 18 is sucked by the needle 4 and the internal pressures of the closed space 18 and the solution sampling container 1 become almost equal, the air suction by the needle 4 is stopped and air bubbles are sucked into the solution in the liquid reservoir 5. There will be no more chance of getting caught. If you press JAG 2 at this time, the inner cylinder 13 will move to the outer cylinder 1.
2, the rubber stopper 3 of the jag 2 sticks into the needle 4, and passes through the rubber stopper 3. Jyag 2
Since the internal pressure of the jug 2 is set in advance to be lower than that of the liquid sampling container 1, the radioactive solution is sucked into the jag 2 through the hollow needle 4. When the jig 2 is pulled out from the needle 4 after the suction of liquid into the jig 2 is completed, the inner cylinder 13 returns to its original position by the force of the spring 17. In this way, air suction from the hollow needle 4 is interrupted before the solution is sucked into the jag 2, so that air bubbles accumulated in the liquid reservoir 5 of the solution sampling container 1 can cause the jag 2 to Variations in the amount of sampled solution are prevented, and high analytical accuracy can be maintained at all times. Next, a comparative test example will be shown in which the needle sealing device of the present invention is attached and not attached. The needle sealing device is shown in Fig. 2 (see Fig. 1) above.
Examples) and those shown in FIGS. 5 and 6 were used as liquid sampling containers. In the liquid sampling container 1 shown in FIG. 5, a sample solution is supplied from the liquid supply port 6. A baffle plate 8 is provided in the liquid reservoir 5, and while the sample solution flows over the upper end of the baffle plate 8 and circulates, it is degassed and discharged from the liquid outlet 7. on the other hand,
In the liquid sampling container 1 shown in FIG. 6, the sample solution supplied from the liquid supply port 6 is similarly degassed by the baffle plate 8. The specifications of these sampling containers and jigs are shown below. Sampling container shown in Figures 5 and 6: Liquid reservoir volume...approx. 50c.c. Internal pressure...-9.400mmAq Needle diameter...1.5mmφ Needle hole...0.8mm width x 2.0mm length, top surface to 1
Location. Jag: Volume: approx. 10 c.c. Internal pressure: 10 ^-2 Torr Water was used as the sample solution, and the test was passed if the volume of water collected in the jag was 70% or more of the jag volume. First, sampling container 1 in Figures 5 and 6
In the case where the device did not have the needle sealing device of the present invention, the jag 2 was pressed against the needle 4, the needle 4 was passed through the rubber stopper 3 of the jag 2, and the liquid sample was drawn into the jag 2. The sample suction was completed almost at the same time as the needle 4 penetrated the rubber stopper 3, but the sample was left for about 5 seconds to achieve pressure balance in the sampling container 1 and the jag 2. Next, the jag 2 was pulled apart and the needle 4 was pulled out from the rubber stopper 3. The results obtained by repeating this operation are shown in the table below. Next, when the sampling containers shown in FIGS. 5 and 6 have the needle sealing device shown in FIG. After air suction ceased, the jag 2 was further pressed to penetrate the rubber stopper 3 of the jag 2, and the liquid sample was sucked into the jag 2. After leaving it in the same manner as above, the jig 2 was pulled out from the needle 4. The results of repeating this operation several times are also shown in the table below. As is clear from this table, it is proven that the liquid sampling container equipped with a needle sealing device receives a larger amount of water from the jig (the amount of water collected in the jag) and is more reliably sampled by the jag. As described above, the liquid sampling container of the present invention has a simple structure of sliding the inner cylinder and the outer cylinder without any precise mechanical parts, so the manufacturing cost is low, and there are few failures, so it is easy to maintain. is also easy. In addition, not only does it prevent air bubbles from accumulating in the liquid reservoir of the liquid sampling container, but the inner and outer tubes do not come into contact with the sample liquid, so it is possible to securely place the sample while preventing contamination with radioactivity or toxic substances. A fixed amount of sample liquid can be collected in a jag, improving analysis accuracy. Furthermore, by removing the pedestal from the liquid sampling container, the entire container can be easily removed. In addition, using metal bellows as an elastic material is not only effective as an elastic material, but also allows the metal bellows itself, which is an elastic material, to maintain a high airtight seal without applying silicone grease to the sliding surface for sealing. This is more preferable because it becomes a mechanism. 【table】

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional liquid sampling container with a jig attached, FIG. 2 is a vertical cross-sectional view showing a first embodiment of the present invention, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention, FIGS.
The figure is a schematic vertical cross-sectional view of a liquid sampling container used in a comparative test of the device of the present invention. 1...Liquid sampling container, 4...Hollow needle, 6...Liquid supply port, 7...Liquid discharge port,
12... Outer cylinder, 13... Inner cylinder, 17, 19... Resilient member.

Claims (1)

[Claims] 1. Provide a liquid supply port and a liquid discharge port on the container body,
and a liquid sampling container to which a hollow sampling needle extending from the container body through the container wall to the outside of the container body is attached, and an outer cylinder or an inner cylinder is provided so as to surround the hollow needle needle extending outside the container body. , an inner cylinder or an outer cylinder having a sample bottle receiving opening at the tip thereof was slidably positioned on the outer cylinder or the inner cylinder via an elastic member, and the sample bottle receiving opening was pressed against a rubber stopper of the sample bottle. A device for sealing a needle portion of a liquid sampling container, wherein a sealed space is formed by the rubber stopper, the outer cylinder, the inner cylinder, and the container body.