JPS6330993Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an impinger used in a liquid collection method, which is one of the methods for collecting harmful substances in measuring the concentration of personal exposure to harmful substances in a working environment.

In order to prevent health problems caused by hazardous substances in the work environment, personal exposure concentration measurements have traditionally been carried out as necessary. To measure this personal exposure concentration, activated carbon tubes, silica gel tubes, and passive samplers are used for organic solvents, while for some specific chemical substances such as phosgene, chlorine, and sulfur hydride, Although portable monitors using the test strip method are commercially available, they are expensive, and considering the problems of workability when worn, they are not very practical, and are difficult to measure exposure concentrations for individuals. I had a problem.

By the way, the liquid collection method implemented under the Work Environment Law has good collection efficiency and is suitable for fixed point measurements because it is a liquid, but it is not suitable for measuring the exposure concentration of workers who move around during their working hours. In this case, the impinger must be attached to the worker's body, and in this case, there is a risk that a slight tilt may spill the solution in the impinger, making it impossible to measure, or damaging the container. It was hot. Furthermore, suction of the sample air causes the solution inside the impinger to bubble, and if sampling continues for a long time, some of the solution becomes droplets and scatters upward, becoming a mist and exiting from the hose connection port. There was a risk of it being lost.

The present invention has been made for the purpose of eliminating the drawbacks of the conventional impingers mentioned above and providing an impinger that does not cause leakage of solution even if it is attached to the body of a worker and continues sampling. A receiving protrusion is provided protrudingly in the center of the bottom wall of the container, a baffle plate is provided around the inner surface of the peripheral wall of the container, and a double pipe consisting of a dandelion tube and an outer tube is inserted so that the lower end of the dandelion tube is inside the receiving protrusion. The container is inserted into the container from the upper opening so that the container faces the container, and is fixed by a cap, and a hanging device is attached to the cap so that the axis of the container is always positioned vertically due to the container's own weight.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a first embodiment of the impinger of the present invention, in which a glass container 1 as the impinger main body has an upper opening 2 and a neck 3.
is formed with a male thread 4, and a shoulder portion 5 is connected from the neck portion 3 to the shoulder portion 5.
A large-diameter body portion 6 is connected to the body portion 6 through the body portion 6. At the center of the bottom wall 7 of the container 1, a receiving protrusion 7 that communicates with the inside of the container 1 is provided so as to project downward. Further, an annular baffle plate 9 is integrally provided on the inner surface of the body 6 of the container 1 at a position about 1/3 from the top of the peripheral wall 8 so that the inner side is located at a slightly higher position than the outer side. has been done. The entire outer surface of the container 1 below the area where the male thread 4 is formed is covered with a plastic film 10 to prevent damage to the glass container 1.

On the other hand, a double pipe 11 inserted into the container 1
is a hollow tube 12 which has a sample inlet 13 at the upper end and an opening 14 at the lower end, and is connected to the upper end of this inner tube 12, and has a diameter of about 2/3 from the upper end of this inner tube 12. It consists of a mantle tube 15 located concentrically around the outer periphery of the hollow tube 12 in the range. The lower end of this mantle tube 15 is open, and the mantle tube 15 is open at the lower end.
A substantially L-shaped communication pipe 16 is integrally protruded from the upper end of the pipe 5, and an end 17 of this communication pipe 16 is used as a hose connection port.

The double pipe 11 is inserted through a center hole 20 of a cap 18 in which a female thread 19 is formed, which is screwed into the male thread 4 of the neck 3 of the container 1.
1 to the cap 18. This packing 21 has a peripheral wall 22 having an outer diameter that can be inserted relatively densely into the container 1 from the upper opening 2 of the container 1.
and a rib 2 that can be seated on the periphery of the upper opening 2.
3.

The cap 18 has an approximately U-shaped hanging fitting 2.
4 is swingably supported, so that the axis of the container 1 is always positioned in the vertical direction due to the weight of the container 1, no matter how the hanging fitting 24 is oriented. . Further, a clip 25 is attached to the center of the upper end of the hanging fitting 24 for attaching the impinger to the clothes of the worker.

In order to measure the exposure concentration of a worker using the impinger configured as described above, first, a certain amount of absorption liquid is placed in the container 1, and the double tube 11 supported by the cap 18 is inserted into the container 1. , cap 18
screw onto the neck 3 of the container 1. At this time, the lower end of the hanging tube 12 faces into the receiving projection 7 of the container 1, and the lower end of the outer tube 15 is located above the baffle plate 9. Next, the hose connection port 1 of the communication pipe 16
A suction pump (not shown) is connected to 7, and the impinger is attached to the worker's clothing using the clip 25 so that the sample suction port 13 of the hollow tube 12 is located near the worker's breathing hole. Further, the suction pump is also attached to the same worker.

When the suction pump is driven in this way, the air inside the container 1 is suctioned by the pump through the mantle tube 15 and the communication tube 16, creating a negative pressure inside the container 1, and the air inside the container 1 is drawn from the sample suction port 13 of the hollow tube 12. Container 1 for sample air
suction inside. This sucked sample air is discharged from the lower end of the hollow tube 12 and collides with the tip of the receiving protrusion 7, the target substance is absorbed into the solution, and the remaining air is pumped from the mantle tube 15 and the communication tube 16. is attracted to.

By the way, the solution droplets generated by the suction air either collide with the baffle plate 9 and fall, or travel along the inner surface of the peripheral wall 8 and are returned to the solution. By colliding with and falling, it increases the stirring effect of the solution and increases the sampling efficiency of the target substance.

In addition, since the axis of the container 1 is always located in the vertical direction regardless of the orientation of the hanging fitting 24,
There is no risk of the solution flowing out even if the worker bends over. Furthermore, by providing the receiving protrusion 7, the amount of solution can be reduced, and even if the container 1 is tilted to some extent, the lower end of the vertical tube 12 faces into the solution, which does not affect sampling in any way.
Sampling is performed without interruption, allowing accurate understanding of worker exposure concentrations. Furthermore,
Even if the container 1 is tilted, the baffle plate 9 prevents the solution from flowing out, and even if the solution exceeds the baffle plate 9 and flows to the upper part of the container 1, the gasket 21 prevents the solution from flowing out.

Note that, as described above, the outer periphery of the container 1 is covered with a plastic film, so that the risk of cracking or breakage due to impact or the like can be prevented.

2 to 4 show modifications of the embodiment shown in FIG. 1, in which the baffle plate 9a is formed so that the inside is lower than the outside, and FIG. 3 is a modification of the embodiment shown in FIG. 7a is shaped like an Erlenmeyer flask, and FIG. 4 shows the lower end opening 14a of the vertical tube 12.
It is made into a rattupa shape. These examples,
Alternatively, the same effects as the embodiment shown in FIG. 1 can be obtained by appropriately combining each embodiment.

Further, a spherical joint or the like may be used for connection to a hanging device that maintains the axis of the container 1 vertically at all times.

As explained above, the impinger according to the present invention has a receiving protrusion on the bottom wall of the container, the lower end of the central plume faces into the receiving protrusion, and a double-layered impingement consisting of the central plume and the outer tube. Since the tube is fixed with a cap and the axis of the container is always vertical, an excellent effect is achieved in that accurate personal exposure concentration can be measured with a small amount of solution without causing solution leakage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the impinger according to the present invention, FIGS. 2, 3, and 4.
Each figure is a front view in half longitudinal section showing a modification of FIG. 1. 1... Container, 7... Receiving projection, 9... Baffle plate,
10...Plastic film, 11...Double tube, 12...Central tube, 15...Outer tube, 16...
Communication pipe, 18... Cap, 21... Packing,
24... Hanging equipment, 25... Clip.

Claims (1)

[Claims for Utility Model Registration] (1) A receiving protrusion communicating with the inside of the container is provided projecting from the center of the bottom wall of a container having an upper opening, and an annular baffle plate is provided around the inner surface of the peripheral wall of the container. A double tube consisting of a hollow tube with a sample inlet at the upper end and a mantle tube located on the outer periphery of the hollow tube and formed with a hose connection port is attached at the lower end of the hollow tube to receive the container. Insert it into the container from the top opening of the container so as to face the inside of the protrusion, and secure it with the cap.
An impinger is provided with a hanging device attached to the cap so that the axis of the container is always positioned vertically due to the container's own weight. (2) The impinger according to claim (1), wherein the outer surface of the container is covered with a plastic film.