JPH0143255B2 - - 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, for example, when a needle is inserted into a sample bottle (hereinafter referred to as a jig) and a sample solution is collected in the jag, the liquid sampling container is closed. Even if the pressure in the gas section increases, the sample solution will not flow through the needle into the sealed space formed by the inner and outer cylinders and the jig and contaminate the sealed space, and the gas in the sealed space will not flow through the needle and The present invention relates to an improved needle sealing device that can prevent the sample solution from being forced into the sample solution in the jag as air bubbles and being collected in the jag from being reduced.

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 constantly 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 became difficult to aspirate and secure the solution into the jag 2, and the amount of liquid sucked into the jag 2 fluctuated, causing problems in analysis.

Therefore, the present inventors first proposed a needle sealing device for a liquid sampling container in order to eliminate such conventional drawbacks (Japanese Patent Application No. 58-77553 (see Japanese Patent Application Laid-open No. 59-203976)). .

This device includes, for example, a liquid sampling container 1 shown in FIG. 1 in which a liquid supply port and a liquid discharge port are provided in the container body as shown in FIG. An outer cylinder 12 is attached to the sampling container 1 on the pedestal 1 so as to surround the needle 4 that has passed through the container body.
6, and an inner cylinder 13 is provided on the inner surface of this 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.

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 the liquid into the jag 2 is completed, the inner cylinder 13 returns to its original position by the force of the spring 17.

In this way, the suction of air from the hollow needle 4 is interrupted before the solution is sucked into the jig 2, so that the jag 2 is Variations in the amount of solution collected are prevented.

However, the rubber stopper 3, the inner cylinder 13, and the outer cylinder 1
2, and the pedestal 16, and after the internal pressures of this space 18 and the gas section 8 of the sampling container 1 were balanced, a pressure fluctuation occurred in the gas section 8 and the pressure inside the gas section 8 increased. In some cases, the sample solution passes through the needle 4 into the closed space 18.
This has the disadvantage that the water flows into the air and contaminates the inside of the closed space 18.

Also, after forming the sealed space 18, push the jag 2 to pierce the rubber stopper 3 into the needle 4.
When the sample solution is sucked into the jig 2 through the suction, if the jag 2 is pushed too quickly, the gas in the closed space 18 will pass through the needle 4 and form bubbles in the liquid reservoir 5 in the sampling container 1. pushed in,
There was a problem in that the air bubbles were absorbed into the jag 2 from the needle 4 when collecting the sample solution, resulting in a decrease in the amount of solution collected into the jag 2.

Therefore, the present invention solves this drawback by communicating the closed space 18 with the gas section 8 of the sampling container 1.

That is, the needle portion sealing device for a liquid sampling container of the present invention is applicable to a liquid sampling container in which a liquid supply port and a liquid discharge port are provided in the container body, and a hollow sampling needle penetrating the container body is attached. A cylindrical body is provided that surrounds the needle that has passed through the container body and is fixed to the container body, and another cylindrical body is slidably positioned on the cylindrical body via an elastic member, and a space that surrounds the needle. The container is characterized in that a communication hole is provided from the container body to the inside of the container body.

The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 shows a first embodiment of the present invention, and the second embodiment of the present invention is shown in FIG.
Communication hole 2 leading from the closed space 18 of the needle sealing device shown in the figure to the gas section 8 of the sampling container 1
0 is provided through the side wall of the sampling container 1 and the pedestal 16.

Although cylinders are usually used as the inner cylinder 13 and the outer cylinder 12, the cylinders are not limited to this, and rectangular cylinders 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.

The size of the communication hole 20 is not particularly limited as long as the internal pressure of the gas section 8 of the sampling container 1 and the internal pressure of the closed space 18 can be kept equal, but it is preferably larger than the inner diameter of the needle 4.

The position of the communication hole 20 is also not particularly limited, but it is preferable to install it at the bottom of the closed space 18 on the pedestal 16 because it can be used as a drain when cleaning the inside of the closed space 18.

In this case, it is more preferable that the communication hole 20 is sloped so that the cleaning liquid can be smoothly discharged.

FIG. 4 shows a second embodiment of the present invention, in which the first embodiment
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 peripheral surface of the pedestal 1.
A spring 17 is installed as an elastic material between the spring 6 and the spring 6.

FIG. 5 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.

As described above, in the liquid sampling container of the present invention, since the communication hole 20 is provided between the sealed space 18 of the needle sealing device and the sampling container 1, the pressure in the gas portion 8 of the sampling container 1 increases. However, the communication hole 20 equalizes the internal pressure of the closed space 18 and the sampling container 1, and the closed space 18 through the needle 4 based on the pressure difference as described above.
There is no leakage.

Further, even if sampling is performed by rapidly pushing the jag 2 after forming the sealed space 18, the gas in the sealed space will be pushed out through the communication hole 20 into the gas section 8 of the sampling container 1.
Air bubbles are pushed into the liquid reservoir part 5 of , the jag 2 sucks the air bubbles, and the amount of liquid collected by the jag 2 does not decrease.

Therefore, according to the present invention, it is possible to prevent variations in the amount of solution collected in the jag and to always collect a constant amount of sample solution.

Furthermore, according to the present invention, there are no precise mechanical parts;
Since it has a simple structure of just sliding the inner cylinder and the outer cylinder, the manufacturing cost is low, and there are few failures, so maintenance is easy.

In addition, not only do air bubbles not accumulate 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 the specified amount can be reliably obtained while preventing contamination with radioactivity or toxic substances. The sample liquid can be collected in a jig, increasing the accuracy of analysis.

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.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional explanatory view showing a conventional liquid sampling container with a jag inserted into the needle, FIG. 2 is a vertical cross-sectional view showing a conventional needle sealing device, and FIG. 3 is a vertical cross-sectional view showing a conventional needle sealing device. FIG. 4 is a vertical cross-sectional view showing a second embodiment of the present invention, and FIG. 5 is a vertical cross-sectional view showing a third embodiment of the present invention. 1...Liquid sampling container, 4...Hollow needle, 12...Outer cylinder, 13...Inner cylinder, 17, 19
... Repellent material, 20 ... Communication hole.

Claims (1)

[Claims] 1. In a liquid sampling container in which a container body is provided with a liquid supply port and a liquid discharge port, and a hollow needle for sampling that penetrates the container body is attached, the container surrounds the needle that penetrates the container body. A cylindrical body fixed to the main body is provided, another cylindrical body is slidably positioned on the cylindrical body via an elastic member, and a communication hole is provided from the space surrounding the needle to the inside of the container body. A needle sealing device for a liquid sampling container, characterized by: