JP7480727B2 - Sampling Port Device - Google Patents

Description

The present invention relates to a sampling port device.

A conventional sampling port device is described in Patent Document 1. This sampling port device includes a main body, a cap, and a septum made of an elastic material. The main body has a cap mounting recess for mounting the tip side of a block-shaped cap, a needle accommodating hole that communicates with the cap mounting recess and accommodates the tip side of a needle that collects fluid, and a number of fluid guide passages for guiding the sample fluid to the needle accommodating hole. The cap also has a needle insertion hole extending along its central axis, and a septum accommodating recess that communicates with the needle insertion hole and is provided on the tip surface. The septum accommodating recess has a plate shape that corresponds to the shape of the septum.

This sampling port device collects the sample fluid, for example, in the following procedure. First, with a septum pressed into the septum housing section, the tip side of the cap is fitted into the cap mounting recess and attached, so that the septum is sandwiched between the bottom surface of the septum housing section and the bottom surface of the cap mounting recess. Next, the tip side of the needle is inserted into the needle insertion hole, and then the septum is pierced and accommodated in the needle housing hole. The sample fluid that has been drawn into the needle housing hole via the fluid guide passage is then collected from the tip side of the needle.

International Publication No. 2019/043754

In the above sampling port device, the fluid guide passage for drawing in the fluid is provided in the main body, and the position of the fluid guide passage cannot be changed, so it is difficult to attach the sampling port device to an arbitrary location in an apparatus or the like in which the sample fluid is present. In addition, it is preferable to be able to prevent the fluid from leaking to the outside from between the cap and the main body.

The object of the present invention is to provide a sampling port device that allows for greater freedom in installation position and also prevents fluid leakage to the outside.

In order to solve the above problems, the sampling port device of the present invention comprises a syringe with a needle, a male threaded housing chamber with a female thread and an elastic body housing chamber located on a first axial side of the male threaded housing chamber, a recessed portion that is open only on the second axial side, a first needle guide hole that extends from the recessed portion to the outside on the first axial side and guides the insertion of the needle, and a nut including an outer peripheral surface portion having a male thread, an elastic body at least a portion of which is housed in the elastic body housing chamber and has an elastic body, a through hole that penetrates in the axial direction and includes a second needle guide hole that guides the insertion of the needle, and a male threaded member including an outer peripheral surface portion having a male thread that screws into the female thread, and an airtight structure that prevents fluid from passing through the outside of the male thread of the nut and leaking to the outside.

In addition, all of the through holes may be the second needle guide holes, or only some of the through holes may be the second needle guide holes.

According to the present invention, since the nut has a male thread on its outer circumferential surface, a female thread is provided or placed at a desired location on the fixed portion of an apparatus or the like in which the sample fluid is present, and the nut can be fixed to the desired location simply by screwing the male thread of the nut into the female thread. Therefore, the sampling port device can be fixed to any location on the fixed portion, which increases the degree of freedom in fixing the sampling port device and increases the versatility of use.

In addition, since the sampling port device has an airtight structure that prevents fluid from passing through the outside of the male thread of the nut and leaking to the outside, even if a nut with a male thread on its outer circumferential surface is used, it is possible to prevent fluid from passing through the outside of the male thread and leaking to the outside. Therefore, a sampling port device can be realized that has a high degree of freedom in fixing and can also prevent fluid from leaking to the outside.

In the present invention, the device may include a main body having a first internal passage and a second internal passage, and a valve body having a through hole that communicates the first internal passage with the second internal passage when in a first position and that blocks communication between the first internal passage and the second internal passage when in a second position, and the main body may have a needle passage hole that communicates with the through hole when the valve body is in the second position and through which the needle passes, and at least a portion of the needle passage hole may be a threaded hole having a female thread that screws into the male thread.

All of the needle passage holes may be the threaded holes, or only some of the needle passage holes may be the threaded holes.

The fluid sampled may be a poison. In this context, according to the present configuration, when the valve body is in the second position, the fluid in the fluid pool present in the through hole of the valve body is collected. Therefore, even if the elastic body deteriorates and fluid leaks from the elastic body to the outside when the needle is inserted, the leaked fluid can be restricted to the fluid in the fluid pool present in the through hole of the valve body, and can be restricted to a very small amount. This significantly increases safety when collecting the fluid.

The present invention may also include a container having a wall portion including a through hole having an internal thread that screws into the external thread of the nut, and defining a fluid storage chamber for storing a fluid.

Furthermore, when the sampling port device includes such a container, it may further include an interior placement nut that screws into another part of the male thread of the nut located within the fluid storage chamber while a part of the male thread of the nut is screwed into the female thread of the container, or it may not include such an interior placement nut.

Conventionally, when a sample fluid is stored in a container, the location from which the fluid is collected may be in a place that is difficult for people to reach. For example, when the container is a large tank, the tank lid that seals the opening from which the fluid is collected may be located at a high place, and a person may have to climb to a high place to open the lid and collect the fluid. In this context, with this configuration, by simply forming a through hole with a female thread in the desired wall location of the container, it is possible to collect the fluid from the desired location of the container much more easily and safely.

The present invention may also include a container having a wall portion including a through hole through which a portion of the nut passes and which does not have a female thread, defining a fluid storage chamber for storing a fluid, and an internally disposed nut that screws onto the male thread of the nut within the fluid storage chamber.

With this configuration, fluid can be collected from a desired location in the container much more easily and safely, just as if the container had a wall portion including a through hole with an internal thread that screws onto the external thread of the nut.

In the present invention, the airtight structure may include at least one of an O-ring, a packing, a gasket, a sealing washer, an adhesive, and a sealing tape.

This configuration makes it easy to create an airtight structure simply and inexpensively.

The sampling port device disclosed herein allows for greater freedom in installation position and also prevents fluid from leaking to the outside.

1A to 1C are diagrams illustrating the structure of a sampling port device according to a first embodiment of the present invention. FIG. 13 is an enlarged cross-sectional view of the vicinity of a needle passage hole in a valve body of a modified example. FIG. 13 is an enlarged cross-sectional view of the vicinity of the needle passage hole of the valve body, illustrating the airtight structure of a modified example. 11A to 11C are diagrams illustrating the structure of a sampling port device according to a second embodiment of the present invention. 11A to 11C are diagrams illustrating the structure of a sampling port device according to a third embodiment of the present invention.

The following describes in detail the embodiments of the present disclosure with reference to the accompanying drawings. Note that when multiple embodiments or variations are included below, it is assumed from the beginning that new embodiments will be constructed by appropriately combining their characteristic parts. In addition, in the following examples, the same components are given the same reference numerals in the drawings, and duplicated explanations will be omitted. In addition, multiple drawings include schematic diagrams, and the dimensional ratios of the length, width, height, etc. of each component do not necessarily match between different drawings. In addition, among the components described below, components that are not described in the independent claims that indicate the highest concept are optional components and are not essential components.

First Embodiment
FIG. 1 is a diagram for explaining the structure of a sampling port device 1 according to a first embodiment of the present invention. As shown in FIG. 1, the sampling port device (hereinafter, simply referred to as the device) 1 includes a device body 50 and a valve 70. The device body 50 includes a syringe 5, a nut 10, a male screw member 40, an elastic body 60, and an O-ring 90. The syringe 5 includes a cylindrical member 6, a needle 7, and a holding member 8. The holding member 8 has a cylindrical shape and holds the needle 7 in its center. The holding member 8 is made of, for example, a resin, and is integrated with the needle 7 by insert molding or the like. The needle 7 is held by the holding member 8 in a state in which it extends along the central axis of the holding member 8 and penetrates the holding member 8, and the tip of the needle 7 protrudes toward the first axial side from the holding member 8.

The holding member 8 holding the needle 7 is joined, for example, by ultrasonic welding to the end of the first axial side of the inner peripheral surface of the cylindrical member 6. The needle 7 has a structure similar to that of an injection needle, and is a very fine hollow tube with a sharp tip on one side. When the tip of the needle 7 is placed in a fluid source containing a sample fluid, the fluid can be passed through a through hole in the needle 7 and drawn into the cylindrical member 6, and as a result, the sample fluid can be collected. There are various types of specifications for syringes, and for example, there are structures that allow a deteriorated needle to be freely replaced. Alternatively, there are also known syringes that can be used to supply a medicinal solution to a human body or the like through the inside of the hollow tube after inserting the needle into the skin of the human body or the like, such as a medical syringe, and can be used to collect blood from the human body or the like. The device of the present invention can be equipped with a syringe of any structure, for example, it can be equipped with such a syringe.

The nut 10 is made of metal or resin. The nut 10 has a recess 11 that is open only on the second axial side. The recess 11 includes a male thread accommodating chamber 13 having a female thread 12, and an elastic body accommodating chamber 14 located on the first axial side of the male thread accommodating chamber 13. The nut 10 also includes a first needle guide hole 15 that extends from the recess 11 to the outside on the first axial side to guide the insertion of the needle 7, and an outer peripheral surface portion 18 having a male thread 17.

The male screw member 40 is made of metal or resin. The male screw member 40 has a through hole 42 that penetrates in the axial direction and includes a second needle guide hole 41 that guides the insertion of the needle 7. The male screw member 40 also includes an outer peripheral surface portion 45 that has a male thread 43 that screws into the female thread 12. The through hole 42 includes a tool insertion hole 67 and a second needle guide hole 41 that communicates with the tool insertion hole 67. The tool insertion hole 67 is, for example, a hexagonal hole, and is a hole for inserting a tool to tighten the male screw member 40 to the nut 10.

The male screw member 40 has a head 63 including a cylindrical outer peripheral surface portion 68 on the side opposite to the nut 10 insertion side in the axial direction. However, if the male screw member has an end face on the side opposite to the nut insertion side in the axial direction that has an end face that is approximately hexagonal or has a shape with two flats when viewed from the axial direction, and includes a head having an outer peripheral surface that can engage a tool, the male screw member does not need to have a tool insertion hole. Therefore, in this case, all of the through holes of the male screw member may be second needle guide holes. The head 63 has an annular seat surface 69 that extends in a direction approximately perpendicular to the axial direction on the nut 10 side in the axial direction. The seat surface 69 abuts against the end surface 48 on the head 63 side of the nut 10 in the axial direction. By making the seat surface 69 abut against the head 63 of the nut 10, excessive crushing of the elastic body 60 described next is suppressed.

The elastic body 60 is made of an elastic material such as a septum. The elastic body accommodation chamber 14 has a shape corresponding to the shape of the elastic body 60. The elastic body accommodation chamber 14 has, for example, a disk shape, and the elastic body 60 has a disk shape corresponding to the elastic body accommodation chamber 14. After at least a part of the elastic body 60 is accommodated in the elastic body accommodation chamber 14, the male screw 43 of the male screw member 40 is tightened into the female screw 12 of the male screw accommodation chamber 13, and the male screw member 40 is tightened and fixed to the nut 10 while pressing the elastic body 60 toward the elastic body accommodation chamber 14 side (first side in the axial direction). In this way, the entire elastic body 60 is pushed into the elastic body accommodation chamber 14. With the male screw member 40 tightened and fixed to the nut 10, the second needle guide hole 41 of the male screw member 40 and the first needle guide hole 15 of the nut 10 extend on approximately the same straight line. It is preferable that the second needle guide hole 41 extends along the central axis of the male threaded member 40, and the first needle guide hole 15 extends along the central axis of the nut 10.

The thickness of the elastic body 60 is preferably greater than the depth (axial length) of the elastic body storage chamber 14. In this way, when the elastic body 60 is pushed into the elastic body storage chamber 14 and stored therein, the elastic body 60 is crushed and compressed in the thickness direction. This increases the airtightness of the elastic body 60 to prevent leakage of fluid, and effectively prevents fluid from passing through the outside of the elastic body 60 and leaking out of the cylindrical member 6. The diameter of the elastic body 60 may be greater than the diameter of the elastic body storage chamber 14, but in order to make it easier to insert the elastic body 60 into the elastic body storage chamber 14, it is preferable that the diameter of the elastic body 60 is the same as or smaller than the diameter of the elastic body storage chamber 14.

In addition, when the male screw member 40 is fastened to the nut 10, a part of the thickness direction of the elastic body 60 may be located within the male screw accommodating chamber 13. Alternatively, the male screw member may have a protruding portion that protrudes from the male screw toward the tip side and presses the elastic body, in which case the thickness of the elastic body may be thinner than the depth of the elastic body accommodating chamber. In the device 1, when the diameter of the elastic body 60 is the same as or smaller than the diameter of the elastic body accommodating chamber 14, the thickness of the elastic body 60 may be thicker or thinner than the depth of the elastic body accommodating chamber 14. In either case, the elastic body 60 can be compressed in the thickness direction to increase the airtightness of the elastic body 60 in the thickness direction, and the leakage of the fluid outside the tubular member 6 can be suppressed.

The valve 70 has a valve body 75 and a valve element 85. The valve body 75 has a first internal passage 71 and a second internal passage 72. The valve element 85 also includes a sphere 74 having a through hole 73 extending along the radial direction, and a rotating shaft 79. The rotating shaft 79 extends from the sphere 74 in a direction perpendicular to the paper surface of FIG. 1. The rotating shaft 79 extends from the sphere 74 to its radially outward side. The extending direction of the rotating shaft 79 and the extending direction of the through hole 73 are approximately perpendicular to each other. The rotating shaft 79 is, for example, screwed to the valve body 75, and a handle (not shown) is provided on the tip side of the rotating shaft 79.

When a person rotates the handle, the rotating shaft 79 can be rotated in the direction indicated by arrow A in FIG. 1. The rotation of the rotating shaft 79 allows the valve body 85 to selectively take a first position or a second position. When the valve body 85 is in the first position, the first internal passage 71 and the second internal passage 72 communicate with each other via the through hole 73. On the other hand, as shown in FIG. 1, when the valve body 85 is in the second position, the communication between the first internal passage 71 and the second internal passage 72 is blocked by the valve body 85.

The valve body 75 has a third needle guide hole 76 that communicates with the through hole 73 when the valve body 85 is in the second position and guides the insertion of the needle 7, and a threaded hole 78 that communicates with the third needle guide hole 76 and has a female thread 77 that screws into the male thread 17 of the nut 10. The third needle guide hole 76 and the threaded hole 78 are included in the needle passage hole 87 that communicates with the through hole 73 when the valve body 85 is in the second position and through which the needle 7 passes. In the example shown in FIG. 1, the case where the needle passage hole 87 includes the third needle guide hole 76 that guides the insertion of the needle 7 has been described. However, as shown in FIG. 2, that is, the enlarged cross-sectional view of the vicinity of the needle passage hole 387 in the valve body 375 of the modified example, all of the needle passage holes 387 may be configured as threaded holes that screw into the male thread 17 of the nut 10, and the needle passage holes may not have needle guide holes. Alternatively, the needle passage hole may have a threaded hole in only a portion of its axial direction, but may not have a needle guide hole.

Referring again to FIG. 1, the nut 10 has a large diameter shaft portion 21 and a small diameter shaft portion 22 that is smaller in diameter than the large diameter shaft portion 21. The large diameter shaft portion 21 and the small diameter shaft portion 22 are connected via a circular step portion 23 that expands in a substantially radial direction. The step portion 23 is provided with an annular O-ring housing groove 24 that opens only to the first axial side. The O-ring housing groove 24 houses an O-ring 90. The male thread 17 is provided on the outer peripheral surface of the small diameter shaft portion 22. The nut 10 is attached to the valve body 75 by tightening the male thread 17 of the small diameter shaft portion 22 into the threaded hole 78 of the valve body 75. When the nut 10 is tightened to the valve body 75, the O-ring 90 is sandwiched and crushed between the bottom surface of the O-ring housing groove 24 and the outer surface 88 of the valve body 75. The O-ring 90 prevents fluid that passes between the threaded hole 78 of the valve body 75 and the male thread 17 of the small diameter shaft portion 22 from leaking to the outside. The O-ring housing groove 24, the O-ring 90, and the outer surface 88 of the valve body 75 form an airtight structure 95. The position of the threaded hole 78 of the valve body 75 is such that when the valve body 85 is in the second position and the needle 7 of the syringe 5 is inserted all the way through the second needle guide hole 41, the elastic body 60, and the first needle guide hole 15 in that order, the tip of the needle 7 reaches the through hole 73 of the valve body 85.

The following sampling experiment was conducted on the device 1 having the above configuration. More specifically, an aqueous solution was used as the sample fluid. With the valve body 85 in the first position, the aqueous solution was allowed to flow through the first internal passage 71, the through hole 73, and the second internal passage 72 in that order. At this time, the needle 7 of the syringe 5 was not inserted into the second needle guide hole 41. Next, with the valve body 85 in the second position, a portion of the aqueous solution was taken into the through hole 73 of the valve body 85, forming a pool of the aqueous solution in the through hole 73. After that, the needle 7 of the syringe 5 was inserted into the second needle guide hole 41 and then pierced the elastic body 60, and the aqueous solution in the pool was sampled. When sampling the aqueous solution from the valve 70, no liquid leakage occurred.

According to the first embodiment, the nut 10 has a male thread 17 on its outer circumferential surface. Therefore, by simply providing a threaded hole 78 at a desired location (a desired location of a fixing portion of an apparatus, etc.) of the valve 70 where the aqueous solution to be sample is present and screwing the male thread 17 of the nut 10 into the threaded hole 78, the nut 10 can be fixed to the desired location. Therefore, the device 1 can be fixed to any location of the valve 70, which increases the degree of freedom in fixing the device 1 and increases the versatility of the device 1's applications.

In addition, since the device 1 has an airtight structure 95 that prevents the aqueous solution from passing through the outside of the male thread 17 of the nut 10 and leaking to the outside, even if a nut 10 having a male thread 17 on the outer circumferential surface portion 18 is used, the aqueous solution can be prevented from passing through the outside of the male thread 17 and leaking to the outside. Therefore, a device 1 can be realized that has a high degree of freedom in fixing and can also prevent the aqueous solution from leaking to the outside.

Furthermore, the aqueous solution to be sampled may be a poison. In this context, according to the present configuration, when the valve body 85 is in the second position, the aqueous solution is collected from a pool of solution that forms in the through hole 73 of the valve body 85. Therefore, even if the elastic body 60 deteriorates and the aqueous solution leaks out from the elastic body 60 when the needle 7 is inserted into the elastic body 60, the leaked aqueous solution can be restricted to the aqueous solution in the pool that exists in the small space of the through hole 73 of the valve body 85, and the amount can be restricted to a very small amount. This significantly increases safety when collecting the aqueous solution.

In the first embodiment, the valve body 85 includes a sphere 74, and the position of the valve body 85 is manually changed. However, the valve body does not have to include a spherical portion. The valve body may have any shape and configuration as long as it has a through hole and is configured to connect the first internal passage and the second internal passage of the valve body in the first position, while blocking communication between the first internal passage and the second internal passage in the second position. In addition, the position of the valve body may be changed by electricity, and the valve may be a solenoid valve or an electric valve in which the valve body is moved by electricity.

Also, an airtight structure 95 has been described in which an O-ring 90 is accommodated in an annular O-ring accommodation groove 24 provided in an annular step portion 23 of the nut 10, thereby preventing the aqueous solution, which is a fluid, from passing through the outside of the male thread 17 of the nut 10 and leaking to the outside. However, as shown in FIG. 3, which is an enlarged cross-sectional view of the vicinity of the needle passage hole 87 in the valve body 75 and which illustrates an airtight structure 495 of a modified example, instead of or in addition to the airtight structure 95 using the O-ring 90, an airtight structure 495 may be constructed by arranging an O-ring 91 on the tip side of the male thread 417 of the nut 410. This airtight structure 495 may prevent the aqueous solution, which is a fluid, from passing through the outside of the male thread 417 of the nut 410 and leaking to the outside.

Also, the airtight structure 95 has been described as including an O-ring 90. However, the airtight structure may include at least one of an O-ring, packing, gasket, sealing washer, adhesive, and sealing tape, or may include other sealing structures. A case in which the airtight structure includes sealing tape will be described in the third embodiment described later. The sealing washer is a rubber member with sealing properties, in which a washer and rubber are integrally molded.

The device of the present invention may be composed of only the device body 50 described above, and may not include a valve 70. This is because the female thread to which the male thread 17 of the nut 10 of the device body 50 is screwed and fixed does not have to be provided on the valve 70, and may be provided on any device. Alternatively, the female thread to which the male thread 17 of the nut 10 of the device body 50 is screwed and fixed may be the female thread of a nut provided on a device other than the valve 70. Cases where the structure (device) having the female thread to which the male thread of the nut of the device body is fixed is not a valve will be described in the following second and third embodiments.

Second Embodiment
4 is a diagram illustrating the structure of a device 101 according to a second embodiment of the present invention. Note that in the second embodiment and the following third embodiment, the description of the same effects and modifications as those in the first embodiment will be omitted.

As shown in FIG. 4, the device 101 includes the device body 50 described in the first embodiment, a container 120 that defines a fluid storage chamber 125 that stores a fluid, and an interior placement nut 140 that is placed in the fluid storage chamber 125. The container 120 has a wall portion 180 that includes a through hole 155, and the through hole 155 is provided with a female thread 177. The male thread 17 of the nut 10 of the device body 50 is screwed into the female thread 177.

By tightening the male threads 17 of the nut 10 to the female threads 177 of the container 120, the O-ring 90 in the O-ring housing groove 24 is clamped and crushed between the bottom surface of the O-ring housing groove 24 and the outer surface 188 of the wall portion 180. The O-ring 90 prevents fluid that has passed between the female threads 177 of the container 120 and the male threads 17 of the nut 10 from leaking to the outside. The O-ring housing groove 24, the O-ring 90, and the outer surface 188 of the wall portion 180 form an airtight structure 195.

When the male thread 17 of the nut 10 is fully tightened onto the female thread 177 of the container 120, the tip side of the male thread 17 of the nut 10 protrudes into the fluid storage chamber 125, and only a portion of the male thread 17 screws into the female thread 177 of the container 120. An indoor placement nut 140 is tightened onto another portion of the male thread 17 located inside the fluid storage chamber 125.

The following sampling experiment was conducted on the device 101 having the above configuration. In the sampling experiment, the thickness of the wall portion 180 was set to 2 mm, and the diameter of the through hole 155 with the female thread 177 was set to 5.5 mm. Then, the male thread 17 of the nut 10 was tightened into the through hole 155, and the indoor placement nut 140 was tightened from inside the container 120 to the tip side of the male thread 17. After that, the container 120 was filled with an aqueous solution, the needle 7 of the syringe 5 was pierced into the elastic body 60, and the aqueous solution in the container 120 was sampled. When the aqueous solution was sampled from the container 120, no liquid leakage occurred. It goes without saying that the aqueous solution is an example of a fluid. It goes without saying that the dimensions of each part of this embodiment are not limited to the dimensions of the parts in the sampling experiment.

According to the second embodiment, fluid can be easily collected from a desired location of the container 120 simply by forming a through hole 155 having a female thread 177 at a desired location of the wall of the container 120. In addition, the aqueous solution in the sealed container 120 can be sampled without opening the container 120.

The above description deals with a case where a portion of the male thread 17 of the nut 10 is fastened to the female thread 177 of the container 120, and the indoor nut 140 is fastened to another portion of the male thread 17 located within the fluid storage chamber 125. However, even if a portion of the male thread is located within the fluid storage chamber when the male thread of the nut is fully fastened to the female thread of the container, it is not necessary to fasten the indoor nut to this portion of the male thread.

Alternatively, if the thickness of the container wall is too thin to form a screw hole in the container, a through hole without a female thread may be provided in the container wall. Then, a part of the nut may be passed through the through hole, and the nut for placement inside the container may be tightened onto the male thread of the nut located in the fluid storage chamber fluid that stores the fluid in the container. In this way, the fluid can be easily collected from the desired location in the container, and furthermore, the aqueous solution in the sealed container can be sampled without opening the container.

Third Embodiment
Fig. 5 is a diagram illustrating the structure of a device 201 according to a third embodiment of the present invention. As shown in Fig. 5, the device 201 includes a device body 250, a tee joint 280, and a sealing tape 290. The device body 250 is different from the device body 50 of the first embodiment only in that the nut 10 is replaced with a nut 210, and the other configurations are basically the same as those of the device body 50. The nut 210 does not have an O-ring receiving groove, but has a tapered male thread 217.

More specifically, the outer peripheral surface of the tip of the nut 210 is a tapered outer peripheral surface 220 that tapers toward the tip, and the tapered male thread 217 is provided on the tapered outer peripheral surface 220. The sealing tape 290 is attached to the entire circumference of the tapered outer peripheral surface 220 so as to cover the entire circumference of the tapered male thread 217.

The tee fitting 280 has a first passage 260 that extends in a straight line, and a second passage 270 that is connected to a midpoint of the first passage 260 and extends from the midpoint of the first passage 260 in a direction substantially perpendicular to the extension direction of the first passage 260. A female thread 277 is provided on the inner peripheral surface of the end of the second passage 270 opposite the first passage 260 side.

By tightening the tapered male thread 217 into the female thread 277, the device body 250 is tightened and fixed to the tee fitting 280. As the tapered male thread 217 is tightened into the female thread 277, the gap between the tapered male thread 217 and the female thread 277 becomes smaller. When the tapered male thread 217 is tightened into the female thread 277 to a certain extent, the tapered male thread 217 and the female thread 277 are in a state where the sealing tape 290 is interlocked between the tapered male thread 217 and the female thread 277, and the tapered male thread 217 cannot be tightened. In this state, the gap between the tapered male thread 217 and the female thread 277 is completely blocked and sealed by the sealing tape 290. The tapered male thread 217, the female thread 277, and the sealing tape 290 constitute an airtight structure 295.

The following sampling experiment was conducted on the device 201 configured as above. First, the tapered male thread 217 was fastened to the female thread 277 with the sealing tape 290 interposed therebetween, thereby fastening and fixing the device body 250 except for the syringe 5 to the tee joint 280. The needle 7 of the syringe 5 was then pierced into the elastic body 60, and the tip of the needle 7 was passed through the second passage 270 and then reached the first passage 260. A mixed gas of hydrogen and nitrogen was used as the fluid to be sampled. The mixed gas was made to flow in one direction in the first passage 260, and then the mixed gas was collected through the needle 7. In the experiment, the mixed gas in the first passage 260 was sampled without any gas leakage.

According to the third embodiment, the mixed gas can be sampled simply by protruding the tip of the needle 7 from the side into the first passage 260, and the mixed gas can be sampled with almost no change in the flow of the mixed gas. Therefore, the mixed gas can be sampled with almost no pressure loss (energy loss per unit flow rate per unit time when a fluid passes through a machine or the like) of the mixed gas.

The present invention is not limited to the embodiments and their modifications described below, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents. For example, in the third embodiment, the airtight structure 295 is formed using the sealing tape 290. However, the airtight structure may be any structure that can prevent the fluid from passing through the outside of the male thread of the nut and leaking to the outside. For example, a device equipped with a valve or a container may have an airtight structure using a sealing tape. Conversely, a device equipped with a tee joint may have an airtight structure using an O-ring. The airtight structure may have both the airtight structure 95 using the O-ring 90 described in the first and second embodiments and the airtight structure 295 using the sealing tape 290 described in the third embodiment.

1,101,201 Device, 5 Syringe, 6 Cylindrical member, 7 Needle, 8 Holding member, 10,210,410 Nut, 11 Recess, 12 Female thread, 13 Male thread accommodating chamber, 14 Elastic body accommodating chamber, 15 First needle guide hole, 17,417 Male thread of nut, 18 Outer circumferential surface of nut, 21 Large diameter shaft portion, 22 Small diameter shaft portion, 23 Step portion, 24 O-ring accommodating groove, 40 Male thread member, 41 Second needle guide hole, 42 Through hole, 43 Male thread, 45 Outer circumferential surface portion, 50,250 Device body, 60 Elastic body, 70 Valve, 71 First internal passage, 72 Second internal passage, 73 Through hole, 74 Sphere, 75,375 Valve body, 76 third needle guide hole, 77 female thread, 78 threaded hole, 79 rotating shaft, 85 valve body, 87, 387 needle passage hole, 88 outer surface, 90, 91 O-ring, 95, 195, 295, 495 airtight structure, 120 container, 125 fluid storage chamber, 140 nut for placement inside the chamber, 155 through hole, 177 female thread, 180 wall, 188 outer surface, 217 tapered male thread, 220 tapered outer circumferential surface, 260 first passage, 270 second passage, 277 female thread, 280 tee joint, 290 sealing tape.

Claims (2)

a syringe having a needle;
a nut having an external thread accommodating chamber having an internal thread and an elastic body accommodating chamber located on a first axial side of the external thread accommodating chamber, a recess that opens only on a second axial side, a first needle guide hole that extends from the recess to the outside on the first axial side and guides the insertion of the needle, and an outer peripheral surface portion having an external thread;
an elastic body having elasticity, at least a portion of which is accommodated in the elastic body accommodation chamber;
a through hole including a second needle guide hole that penetrates the needle in the axial direction and guides the insertion of the needle; and a male screw member including an outer peripheral surface portion having a male screw that screws into the female screw;
an airtight structure that prevents a fluid from passing through the outside of the male thread of the nut and leaking to the outside;
a body having a first internal passage and a second internal passage;
a valve body having a through hole that communicates the first internal passage and the second internal passage when in a first position, and blocking communication between the first internal passage and the second internal passage when in a second position,
the main body has a needle passage hole that communicates with the through hole when the valve body is in the second position and through which the needle passes,
At least a part of the needle passage hole is a screw hole having a female thread that screws into the male thread of the nut,
The nut has a large diameter shaft portion and a small diameter shaft portion having a diameter smaller than that of the large diameter shaft portion,
the large diameter shaft portion and the small diameter shaft portion are connected via an annular step portion,
The male thread of the nut is provided on an outer circumferential surface of the small diameter shaft portion ,
the needle passage hole includes the screw hole and a third needle guide hole that communicates with the screw hole via an annular step portion and has a smaller diameter than the screw hole,
A sampling port device , wherein the third needle guide hole communicates with the through hole of the valve body when the valve body is in the second position and guides insertion of the needle . The sampling port device of claim 1 , wherein the airtight structure includes at least one of an O-ring, a packing, a gasket, a sealing washer, an adhesive, and a sealing tape.

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