JPS6070337A - Device for tightly closing needle part of liquid sample container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a needle sealing device for a liquid sampling container, and more specifically, when a needle is inserted into a sample bottle (hereinafter referred to as a jug) and a sample solution is collected in the jug, the liquid sampling container is closed. Even if the pressure in the gas part of The present invention relates to an improved needle part closing device that can prevent the sample solution collected in the jug from being reduced by being forced into the sample solution in the jug through the needle as air bubbles.

Conventionally, when sampling liquids such as radioactive solutions or solutions containing toxic substances such as It is difficult to collect by normal sampling methods, for example, when sampling radioactive solutions, the sample shown in Figure 1 is placed inside a quadruple box (usually called sampling pliers) with lead shielding. A sampling container 1 such as the one shown in FIG.
The liquid is then transferred into the container 1 and discharged from the liquid discharge lower.

On the other hand, using a manipulator or tongs installed in the sampling bench, the plug 6 of the jug is inserted into the hollow needle 4 of the sampling container 1, and the needle of the sampling container 1 is pierced by the difference in the vacuum degree between the sampling container 1 and the jug 2. The radioactive solution was aspirated into jug 2 through 4.

In this conventional radioactive solution sampling method, the radioactive solution remaining in the needle 4 and the radioactively contaminated air used for the radioactive solution airlift are prevented from leaking to the outside of the sampling container 1. In order to
The pressure inside the sampling container 1 is changed to the pressure inside the sampling container 1,
That is, by keeping the pressure lower than the pressure inside the sampling bench and inserting the needle 4 into the stopper 6 of the jug 2, air was always drawn into the sampling container 1 following the needle 4.

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 the solution is sucked into the jug 2, just before the jug is inserted into the needle 4, the liquid reservoir part 5
The air bubbles that were present in the jug 2 are sucked into the jug 2 through the needle 4, making it difficult to suction and secure a certain amount of solution necessary for analysis into the jug 2. fluctuations, which hindered analysis.

In order to overcome these conventional drawbacks, the inventors of the present invention first proposed a needle sealing device for a liquid sampling container (Japanese Patent Application No. 77553/1983).

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 tube 12 is fixed to the sampling container 1 via a pedestal 16 so as to surround the needle 4 that has passed through the container body, and the outer surface of the inner tube 16 comes into contact with the inner surface of the outer tube 12 so that it can be inserted. Gotoku inner cylinder 1
3 is provided.

A jug receiving opening 14 and a stopper 15 are formed at the tip of the inner cylinder 16, and an elastic force such as a spring 17 is provided along the inside of the inner cylinder 16 between the stopper 15 and the base 16. is provided.

This spring 17 functions as a return mechanism that returns the pushed inner tube 16 to its original position when the inner tube 13 is pushed in by the jug 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 discharge lower.

At this time, in order to prevent the gas and liquid in the sampling container 1 from leaking outside the sampling container 1, the pressure inside the sampling container 1 is kept lower than the pressure outside the container 1. Air outside the container 1 is sucked into the container 1 through.

Now, at this time, the jug receiving port 14 at the tip of the inner cylinder 13
When you press the rubber stopper 6 of jug 2 into the jug receiving opening 1
4 is in close contact with the rubber stopper 6, and the rubber stopper 3, the inner cylinder 13, and the outer cylinder 1
2 and a pedestal 16 are formed.

Then, when the air in the sealed space 18 is sucked by the needle 4 and the internal pressures of the sealed 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 jug 2 at this time, inner cylinder 16il-1: outer cylinder 1
The rubber stopper 6 of the jug 2 sticks into the needle 4 and passes through the rubber stopper 6. /Since the internal pressure of the spear 2 is set to be more negative than that of the liquid sampling container 1,
Radioactive solution is drawn into the jug 2 via the hollow needle 4 . After suction of liquid into jug 2 is completed, jug 2
When the inner cylinder 16 is pulled out from the needle 4, the inner cylinder 16
The force of 7 returns it to its original position.

In this way, the air suction from the hollow needle 4 is interrupted before the solution is sucked into the jug 2, so that the air can be collected into the jug 2 based on the air bubbles staying in the liquid reservoir 5 of the solution sampling container 1. This prevents variations in the amount of solution used.

However, a sealed space 18 consisting of the rubber stopper 6, inner cylinder 13, outer cylinder 12, and pedestal 16 is formed, and this space 1
8 and after the internal pressure of the gas section 8 of the sampling container 1 is balanced, if there is a pressure fluctuation in the gas section 8 and the pressure inside the gas section 8 increases, the sample solution flows into the closed space 18 through the needle 4, There was a drawback that the inside of the closed space 18 was contaminated.

In addition, when pressing the jug 2 to pierce the rubber stopper 3 into the needle 4 after forming the sealed space 18 and sucking and collecting the sample solution into the jug 2 through the needle 4, if the jug 2 is pushed too quickly, the sealed space The gas in 18 passes through the needle 4 and becomes bubbles in the liquid reservoir 5 in the sampling container 1, and when the sample solution is collected, the bubbles are pushed into the needle 4.
There was a problem that the amount of solution absorbed into the jug 2 was reduced.

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 liquid sampling container needle sealing device of the present invention is a liquid sampling container in which the container body is provided with a liquid supply port and a liquid discharge port, and in which a hollow sampling needle penetrating the container body is additionally provided. 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 elastic wings to surround the needle. The container is characterized in that a communication hole is provided from the space in which the container is opened to the interior 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, in which a communication hole 20 leading from the sealed space 18 of the needle sealing device shown in FIG. 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 sealing agent such as silicone grease is applied to the contact surface between the inner cylinder 13 and the outer cylinder 12 in order to facilitate sliding and to improve the airtightness of the closed space 18 as described later. It's a good idea to leave it there.

The jug receiving opening 14 is flat and has no irregularities so that it can be brought into close contact with the rubber stopper 6 of the jug 2. It's a size /
The size of the YAG receiving opening 14 may be any size as long as it can receive the rubber stopper 3.

The size of the communication hole 20 is the same as that of the gas part 8 of the sampling container 1.
Although there is no particular restriction as long as the internal pressure of the needle 4 and the internal pressure of the closed space 18 can be kept equal, it is preferable that the internal pressure be equal to or larger than the inner diameter of the needle 4.

Further, the position of the communication hole 20 is not particularly limited, but
It is preferable to install it on the pedestal 16 at the bottom of the container 8 because it can be used as a drain when the inside of the closed space 18 is cleaned.

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, contrary to the first embodiment, an inner cylinder 16 is fixed to the sampling container 1 via a pedestal 16, and the outer surface of the inner cylinder 13 is A stopper 15 is provided on the outer cylinder 12 that is inserted in contact with the outer cylinder 12, and a spring 17 is added as an elastic material between the stopper 15 and the base 16.

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, the metal bellows 19, and the base 1.
6 to form a quadruple sealed space 18.

This third embodiment is better than the device 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 metal bellows can provide a more airtight seal, air leakage from the sealed space 18 can be more reliably prevented.

As described above, the liquid sampling container of the present invention is
Since the communication hole 20 is provided between the closed space 18 of the needle sealing device and the sampling container 1, even if the pressure in the gas section 8 of the sampling container 1 rises, the communication hole 20 prevents the connection between the closed space 18 and the sampling container 1. The internal pressure is equalized, and there is no leakage of liquid into the sealed chamber 18 through the needle 4 based on the differential pressure as described above.

Furthermore, even if sampling is performed by rapidly pushing the jug 2 after the sealed space 18 is formed, the gas in the sealed space will still flow into the communication hole 20.
Since the air bubbles are pushed out to the gas section 8 of the sampling container 1 through the gas tank 1, the air bubbles are not pushed into the liquid reservoir section 5 of the sampling container 1, and the jug 2 sucks these air bubbles, thereby preventing the amount of sampled liquid in the jug 2 from decreasing. .

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

Further, according to the present invention, there is no need for precise mechanical parts and the structure is simple, just sliding the inner cylinder and the outer cylinder, so the manufacturing cost is low, and there are few failures, so maintenance is easy.

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 prevent contamination by radioactivity or toxic substances. A predetermined amount of sample liquid can be collected into a jug, and analysis accuracy can be improved.

Furthermore, if the pedestal is removed from the liquid sampling container, the whole 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 the drawing]

FIG. 1 is a vertical cross-sectional view showing a state in which a jug is inserted into the needle of a conventional liquid sampling container. FIG. 2 is a vertical cross-sectional view showing a conventional needle sealing device. FIG. FIG. 4 is a longitudinal cross-sectional view showing one embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Liquid sampling container, 4...Hollow needle, 12...Outer cylinder, 13...Inner cylinder, 17, 19...
- Resilient material, 20... communicating hole. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] 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 sampling needle penetrating the container body is additionally provided, the container is arranged so as to surround the needle penetrating 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 mechanism, and a communication hole is provided from a space surrounding the needle to the inside of the container main body. A device for sealing a needle portion of a liquid sampling container, characterized in that: