JPH0120667Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for measuring the concentration of vaporizable components in a liquid using a tube method using a porous tube having liquid repellency and continuous micropores. It concerns the structure of the sampler.

Sampler for volatile components in liquid using a porous tube (hereinafter simply referred to as sampler)
As disclosed in Utility Model Application No. 55-14575, etc.,
Basically, a carrier gas supply conduit connected to deliver carrier gas to an area surrounded by a porous tube or partially surrounded by a sheet of porous material, and for discharging the carrier gas. carrier gas discharge conduit connected to,
and a part that holds them together, and in some cases a protective tube to protect the porous tube from the flow of the liquid, to avoid contact with foreign objects such as tank walls or containers, and to detect the temperature of the liquid. A temperature detection end, etc. was also added.

Such conventional samplers include the following:
This is illustrated by FIG. That is, the illustrated sampler connects carrier gas conduits 2 and 3 to one end of a porous tube 1, and connects one carrier gas conduit 3 to one end of a porous tube 1.
A structure in which the carrier gas conduits 2 and 3 are bent at an angle of 180 degrees, parallel to each other, and placed together in a container etc. using the holding part 4 (see Figure 1), or a structure in which the carrier gas pipes 2 and 3 are bent approximately 90 degrees, parallel to each other, and brought together by the holding part 4. (Second
(see figure) are common, and as a result, the structure itself is extremely simple, easy to manufacture, and has many advantages such as low manufacturing cost.

However, when measuring volatile components in liquid using the conventional sampler shown in Figs. 1 and 2,
Since the porous tube part needs to be completely immersed in the liquid to be measured, it should be the smallest size among the porous tubes and carrier gas conduits, such as a porous tube with an outer diameter of 3 mm and a length of 25 mm, and a conduit with an outer diameter of 25 mm. Even when using a 3mm tube, the sampler shown in Figure 2 has a diameter of about 35mm including the bent portion of the conduit.
A measuring vessel with an inner diameter of Even with the sampler shown in Figure 1, a considerable radius of curvature is required to bend the conduit 180°, so even if the above-mentioned porous tube or conduit is used, a measurement container with an inner diameter of at least 20 mm is required. .

In this way, in conventional samplers, although the porous tube is the only substantial part that must be immersed in the liquid to be measured, the structure of the carrier gas conduit portion makes the measuring vessel unnecessarily large. A large amount of liquid to be measured was required.

Furthermore, the external appearance has two pipes, and if a temperature detection end is added, three pipes are arranged side by side, so dirt easily accumulates on the inside of the pipes, and it is difficult to remove them. It also had

The present invention was completed in order to solve the above-mentioned problems of conventional vaporizable components in liquid. Furthermore, the temperature detection end is also structured to pass through the inside of the porous tube, and more specifically, the temperature detection end is removably fitted to one end of the porous tube having liquid repellency and continuous micropores. a hollow outer cylinder having a flexible end and the other end sealed with a closed lid or a solid support part; and a hollow outer cylinder that is removably fitted to the other end of the porous tube to seal the open end of the tube. A tip of the outer tube, which is integral with or separate from the outer tube, and a hole is formed in the outer tube closing lid part or support part so that one end opens to the outside of the outer tube and the other end opens near the tip of the outer tube, and the hole is opened. A carrier gas air supply conduit, which is formed by extending a pipe body from the hole and positioning the open end of the extension near the tip of the outer cylinder, and passing through the closed lid part or the support part of the outer cylinder and opening one end to the outside of the outer cylinder. This is a sampler for measuring volatile components in a liquid, and a carrier gas exhaust conduit whose other end communicates with the inner space of the outer cylinder. The objective is to provide a sampler that has a rod-like structure and can perform measurements even in containers with small inner diameters, such as test tubes.

The details of the sampler for measuring volatile components in liquid according to the present invention will be explained below based on illustrated embodiments. FIG. 3 shows the basic structure of the sampler according to the present invention. Reference numeral 5 designates a porous tube, and an outer tube 9 and a bottomed dish-shaped outer tube tip 10 are removably fitted to both ends of the tube to form a single cylinder. A support part 6 made of a columnar solid member is removably fitted and connected via an O-ring 6a, and a carrier gas supply conduit 7, which passes through this support part 6 and protrudes downward from the support part 6, is connected to the O-ring 6a. A carrier gas discharge conduit 8 is formed in parallel with the carrier gas supply conduit 7 and has a lower end opening into the outer cylinder 9 and is formed to penetrate through the support portion 6 . The carrier gas air supply conduit 7a is open near the inside of the outer cylinder tip 10, and the delivered carrier gas passes through the inside of the outer cylinder.
Volatile components in the liquid passing through the porous tube 5 are collected and guided to an external detector (not shown) through a carrier gas discharge conduit 8.

Here, the inner and outer diameters of the carrier gas air supply conduit 7a are:
It should be determined in relation to the inner diameter of the outer cylinder 9,
Further, the carrier gas air supply conduit 7a can be configured to have a double structure with a gap provided inside the outer cylinder 9.

Note that the arrangement of the carrier gas air supply conduit 7a and the outer cylinder 9 must also be taken into consideration from the linear velocity of the carrier gas.

For example, as in the embodiment shown in FIG. The flow velocity of the carrier gas flowing through the porous tube portion can be intentionally set to be high or low by changing the cross-sectional area ratio appropriately. You can also do it.

In the embodiment shown in FIG.
are connected by an O-ring 6a, but as shown in FIG. 4, it is also possible to eliminate the separate support part and integrally form a closing lid on the upper end of the outer cylinder 9.

In the embodiment shown in FIG. 3, the connection between the outer cylinder 9 (or the integrated body) and the outer cylinder tip 10 is reinforced by a reinforcing part 9a.

This reinforcing part 9a not only supports the outer cylinder tip 10 but also supports the porous tube 5 from inside.As an embodiment of the reinforcing part 9a, as shown in FIGS. In addition to book sticks, the 6th
A mesh-like one as shown in the example shown in the figure, or one with many holes in the extension cylinder of the outer cylinder 9 (the seventh
(see figure) etc. are possible. Furthermore, if the porous tube has sufficient strength, the reinforcing portion may not be necessary (see FIGS. 8 and 17).

In the embodiment shown in FIG. 8, the carrier gas supply conduit 7a and the outer cylinder tip 10 are joined, the outer cylinder tip 10 is held by the carrier gas supply conduit 7a, and the reinforcing part is removed. It is. In this case, the carrier gas supply conduit 7a is provided with an opening 7b for discharging the carrier gas.

Needless to say, in a sampler having a structure in which the support portion 6 and the outer cylinder 9 are detachable, the carrier gas supply conduit 7a and the outer cylinder tip 10 must not be joined.

The support part 6 and the outer cylinder 9 can be connected using the O-ring method shown in FIG. 3, the screwing method shown in FIG. 9, and the O-ring and presser fitting 11 shown in FIG. 10. The method is easy and the structure is reliable.

The advantage of having a removable structure for the support part 6 and the outer tube 9 is that it is easy to assemble and inspect the inside, and the porous tube 5 can be easily replaced. That is, by preparing several outer cylinders 9 to which porous tubes 5 are attached in advance, the porous tubes can be replaced with a single touch.

The connection between the porous tube 5 and the outer cylinder 9 may be any structure as long as it does not allow liquid to enter and is not easily disconnected. For example, if the flow of the liquid is slow, it can be used simply by inserting it into the outer cylinder 9 as long as the liquid does not enter.

If a reliable connection is required, such as when the flow of the liquid to be measured is intense, the connection can be ensured using a stopper 12 such as a hose band (see Figure 11), or a sealing material 13 can be used to close the gap. It is preferable to adopt a structure in which the wire is sealed (see Fig. 12), a structure in which a stopper 14 such as a wire is used (see Fig. 13), a structure in which a band 15 made of synthetic resin is used (see Fig. 14), etc. be.

In a device for measuring a vaporizable component in a liquid, it is often necessary to detect the temperature of the liquid and correct the concentration signal of the vaporizable component. Therefore, it is extremely effective to add a temperature detector 16 to the sampler for the vaporizable components in the liquid.

The embodiment of the sampler shown in FIG. 15 incorporates a temperature detection end 16a so that the tip of the temperature sensor 16 passes through the inside of the carrier gas supply conduits 7, 7a and protrudes from the outer cylinder tip 10. be. 1
7 is a temperature detection end lead wire.

The liquid contact portion of the temperature detection end 16a does not necessarily need to protrude into the outer cylinder tip 10. It is also possible to attach it to an appropriate position such as the surface of the outer cylinder 9, as long as it is a position where the temperature of the liquid whose vaporizable components are to be sampled can be accurately detected and does not protrude too much to the outside.

A structure in which a rod-shaped detection end inserted into a protection tube is used as the temperature detection end 16a and is passed through the inside of the carrier gas air conduit 7, 7a as in the embodiment shown in FIG. 15, and these are arranged in a concentric circle, FIG. As in the embodiment shown in FIG. 17, the temperature detection end 16a is placed in the center, and the carrier gas supply conduit 7a is arranged a little apart from the center.As in the embodiment shown in FIG. A structure in which the detection end 16a is arranged at a position forming the apex of a triangle within the cross section of the support portion 6 is effectively used.

Furthermore, if a detection end with a small shape such as a thermistor temperature detection part is used as the temperature detection end 16a, the temperature detection end 16a
can freely choose the installation location.

Each part of the above sampler is made of metal, synthetic resin, glass, ceramics, etc. depending on the ease of processing.
One type or a combination of multiple types can be used in consideration of strength and the like.

The connection between the carrier gas supply conduit, discharge conduit, and external detection unit can be made using various commonly known tube joints or joints that are particularly effectively used for analytical instruments such as gas chromatographs. You can choose freely.

Various embodiments of the sampler for vaporizable components in liquid according to the present invention have been described in detail above.
The scope of the present invention is not limited to the above-mentioned embodiments themselves, and appropriate combinations of the above embodiments can also be implemented within the scope of the present invention. In short, the gist of the present invention is a sampler having a structure in which a carrier gas supply conduit, a discharge conduit, and even a temperature detection end are integrated within a size approximately equal to the outer diameter of a porous tube.

When the sampler according to the present invention uses a porous tube having an outer diameter of about 8 mm and an inner diameter of about 6 mm, a carrier gas supply conduit, a discharge conduit, a temperature detection end, etc. can be easily constructed inside the tube. Furthermore, if extremely fine machining is performed, it is not impossible to construct them within a porous tube with an outer diameter of about 4 mm and an inner diameter of about 3 mm.

As mentioned above, the sampler of the present invention has an extremely small outer diameter compared to conventional samplers, so it can be used in test tubes, for example, and the container to be measured can be small, reducing the amount of solution to be measured. In addition to having extremely excellent characteristics such as these, it has a smooth outer shape, which has great advantages in removing dirt and cleaning it, and also provides various effects such as increasing overall strength. be.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic diagrams showing the shape of a conventional sampler, and FIGS. 3, 4, and 5 are
Vertical cross-sectional views of various embodiments of the sampler according to the present invention, A-A cross-sectional views in each figure, and Figures 6 and 7 show the outer cylinder located at both ends of the porous tube and the reinforcement between the outer cylinder tip. 8A and 8B are a longitudinal sectional view showing the vicinity of the connection between the carrier gas supply conduit and the tip of the outer cylinder, and a sectional view taken along line A-A of the same, and FIGS. 9 and 10 11, 12, and 13 are cross-sectional views showing examples of the structure of the connection part between the support part and the outer cylinder.
Fig. 14 is a schematic diagram showing various structures related to the attachment part of the porous tube and the outer cylinder, and Fig. 15, Fig. 16, Fig. 17, and Fig. 18 each have a built-in temperature detection end. FIGS. 15 to 18 are vertical cross-sectional views showing various embodiments of the sampler. 1... Porous tube, 2, 3... Carrier gas conduit, 4... Holding part, 5... Porous tube,
6...Support part, 7, 7a...Carrier gas supply conduit, 8...Carrier gas discharge conduit, 9...Outer cylinder, 10...Outer cylinder tip, 11...Press fitting, 1
2... Stopper, 13... Sealing material, 14... Stopper, 15... Band, 16... Temperature detector.

Claims (1)

[Claims for Utility Model Registration] (1) A porous tube having liquid repellency and continuous micropores, and an end portion that can be detachably fitted to one end of the porous tube, and the other end is closed or closed. a hollow outer cylinder sealed with a solid support part; and an outer cylinder tip part integrated with or separate from the outer cylinder, which is removably fitted to the other end of the porous tube to seal the open end of the tube. A hole is formed in the outer cylinder closing part or the support part so that one end opens to the outside of the outer cylinder and the other end opens near the tip of the outer cylinder, and a tube body is extended from the hole, and the extended open end is opened. a carrier gas air supply conduit located near the tip of the outer cylinder; and a carrier gas exhaust pipe that penetrates the closed lid portion or support portion of the outer cylinder, opens one end to the outside of the outer cylinder, and the other end communicates with the space inside the outer cylinder. A sampler for measuring volatile components in liquid, consisting of a conduit and. (2) The vaporizable component in the liquid according to claim 1, which is a utility model registration, in which a temperature sensor having a temperature detection end located on the outer surface of the tip of the outer cylinder is arranged inside the porous tube and the outer cylinder. Sampler for measurement.