JPS6020876Y2 - Seal connection structure of glass chromato tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a seal connection structure for glass chromato tubes for qualitative and quantitative analysis of liquids.

More specifically, when a glass chromato tube and a connecting member are brought into close contact with each other under strong pressure, a male thread is formed on the glass chromato tube and the connecting member, and a two-stage female thread that fits the respective threads is formed. A nut provided with the above is screwed onto the glass chromato tube, and the connecting member is rotated to bring it into close contact with the glass chromato tube, and the connecting member is connected to the glass chromato tube without damaging the glass chromato tube. This invention relates to a seal connection structure for a glass chromato tube 10 that can be crimped and fixed to a glass chromato tube 10.

Chromato tubes are used to analyze the components and amounts contained in liquids such as sake and soy sauce.A hollow glass tube (chromato tube) is filled with resin, activated carbon, etc., and the sample is passed through an eluent. A specific sample is analyzed by passing the liquid through the packing and examining the liquid discharged from the glass tube with a spectrometer, or by examining the liquid absorbed by the packing.

In this case, a connection structure is required at the end of the glass tube to connect the sample supply tube to this glass tube.

Fig. 4 shows a conventional seal connection structure of a glass chromato tube, in which a flange portion 2a that widens toward the end is formed at the end of a glass chromato tube 2 filled with a filler 1 such as resin or activated carbon. There is.

A nut 3 having a female threaded portion 3a provided on the inner periphery of the upper part is loosely fitted to the chromatography tube 2, and a rotating member 4 having a male threaded portion 4a carved in the female threaded portion 3a that fits the threaded portion 3a is attached. Screw together.

A connecting member 5 is press-fitted into the rotating member 4, and by rotating the rotating member 4, a backing 6 provided on the lower surface of the connecting member 5 is crushed between the connecting member 5 and the chromatography tube 2. 2. Seal 5.

At the same time, the nut 3 is crimped onto the chromatography tube 2 through the sleeve 7 having a split groove 7a as shown in FIG. 5, and the washer 8 split into two parts as shown in FIG. By screwing the setscrew 9 into the lower surface of the nut 3, the three members 2, 3.4 are integrated, and the connecting member 5 and the chromato tube 2 are connected.
The inside of the connecting member 5 communicates with the communication hole 5b of the connecting member 5.

After this, a tube for supplying the sample is connected to the tip nozzle portion 5a of the connecting member 5, and a flow hole 5b extending vertically through the connecting member 5 is connected.
When a sample is sent to the filter 100, the foreign substances contained in the sample are filtered out by the filter 100 and circulated through the packing 1, thereby impairing the inspection of the sample as described above.

In this case, a pump is provided in the sample supply circuit in order to quickly pass the sample through the filling material 1, and the pump applies pressure to the sample and pumps it.

This pressure reaches 50 to ω atmospheres, which is a high pressure.

Therefore, when connecting the connecting member 5 to the chromato tube 2, the chromato tube 2 and the connecting member 5 must be tightly crimped and connected to prevent the sample from leaking.

The chromato tubes used in liquid chromatographs for qualitative and quantitative analysis of liquids simultaneously satisfy the chemical resistance, pressure resistance, and heat resistance required of the chromato tube itself, and the inner periphery of the tube is precisely Since it must have a smooth inner circumferential surface, glass is the most suitable material.

That is, metal chromato tubes are inferior in terms of chemical resistance, synthetic resin chromato tubes are inferior in chemical resistance, pressure resistance, and heat resistance, and both metal and synthetic resin tubes have poor inner periphery. Glass chromatograph tubes are used in liquid chromatographs because the surface cannot be a highly accurate smooth surface due to its structure.

In the conventional seal connection structure described above, the rotating member 4 is strongly rotated to tightly press the connecting member 5 to the glass chromato tube 2. Since the nut 3 is locked, the flange portion 2a may be damaged, and the connecting member 5 cannot be sufficiently crimped due to the strength of the glass chromato tube 2 itself.

If the rotating member 4 is operated with force, the glass chromato tube 2 will be damaged, and if the rotating member 4 is operated to the extent that the chromato tube 2 is not damaged, the connecting member 5 and glass will be tightly tightened. chromatography tube 2 could not be crimped.

Another problem with the conventional seal connection structure shown in FIG. 4 is that the nut 3 and the rotating member 4 are both made of stainless steel, which makes the parts expensive and economically disadvantageous. Moreover, since stainless steel is difficult to process, there is also the problem that each component cannot be manufactured easily.

Other seal connection structures include a glass chromato tube with a threaded part and a connecting member directly screwed into this threaded part, but in this connection structure as well, the connecting member is attached to the chromato tube. In the case of tight contact with the connecting member, the tightening force of the connecting member acts directly on the threaded portion of the glass chromato tube, so there is a strong possibility that the chromato tube will be damaged.

The inventors of the present invention took into consideration the above-mentioned conventional problems in bringing a connecting member into close contact with a glass chromato tube under strong pressure, and developed the present invention in order to effectively solve the problems.

The object of the present invention is to form a male threaded portion at the end of a glass chromato tube, and also form a male threaded portion on a connecting member that is tightly attached to the chromato tube, and to connect the respective male threaded portions. Loosely screw a nut with a matching two-stage female screw part onto the chromatography tube, screw the connection member onto the nut, and tightly connect the connection member to the glass chromatography tube via the backing. An object of the present invention is to provide a seal connection structure for glass chromatography tubes that is crimped.

Therefore, the object of the present invention is to screw the connecting member after screwing the nut onto the glass chromatography tube so that the chromatography tube and the connecting member are brought into close contact with each other under strong pressure. Even when operated, this rotational force does not act on the chromato tube, and only the linear force (force moving toward the connecting member) of the nut that moves in the length direction of the chromato tube acts on the chromato tube. Since a large force is not applied to the male threaded portion of the glass chromato tube, and the total surface area of the male threaded portion of the chromato tube that receives this force is large, there is no risk of damaging this male threaded portion, and metal material It is an object of the present invention to provide a seal connection structure for a glass chromato tube, which allows a connection member to be securely brought into close contact with strong pressure even to a glass chromato tube whose strength is lower than that of the glass chromato tube.

Furthermore, the object of the present invention is to provide two glass chromatography tubes, screwing the nut to each chromatography tube,
Provided is a seal connection structure for glass chromato tubes, in which the two chromato tubes can be connected by pressure by forming threaded portions at both ends of the connecting member and screwing the connecting member. do.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 3 show embodiments of a seal connection structure for glass chromatography tubes according to the present invention.

Reference numeral 10 shown in FIG. 1 is a glass chromato tube. A through hole 10a is formed inside the glass chromato tube 10, and a through hole 10a is formed in this portion 10a for quantitative or qualitative analysis of sake, soy sauce, etc. It is filled with a filler 11 such as resin or activated carbon.

The end of the chromatography tube 10 is made into a large diameter part, a male threaded part 12 is carved on the outer periphery of the large diameter part, and a nut 14 having a female threaded part 13 that fits the threaded part 12 is screwed into this threaded part 12. do.

Inside the nut 14, another female threaded portion 15 different from this female threaded portion 13 is formed, one threaded portion 13 has a larger diameter than the other threaded portion, and the axes of these 13.15 are aligned. It is formed continuously.

A connecting member 17 having a male threaded portion 16 on the lower outer periphery that is compatible with the threaded portion 15 is screwed into the small diameter female threaded portion 15 .

A main body 17a of the connecting member 17 is located approximately at the center of the connecting member 17.
A rotary operation portion 17b formed to have a larger diameter is provided, and a nozzle 17c is formed at the tip of the connecting member 17.

Also, inside the glass chromato tube 1, a sample such as soy sauce is stored.
A communication hole 17d for feeding the water into the air is vertically bored through the hole 17d.

In the above, the nut 14 and the connecting member 17 are made of vinyl chloride, trifluorochloroethylene, or Tefzel (
Molded from a chemical-resistant material such as Mitsui Fluorochemical Co., Ltd.).

When the connecting member 17 is screwed onto the nut 14, the backing 18 is interposed between the connecting member 17 and the glass chromato tube 10, and the filter 19 is inserted between the glass chromato tube 10.
It is arranged opposite to the through hole 10a of No. 0.

The backing 18 is preferably made of, for example, a tetrafluoride resin, and the filter 19 is preferably made of porous Teflon (tetrafluoroethylene polymer).

The nut 14 is not tightly screwed onto the glass chromatography tube 10, but is loosely screwed onto the glass chromatography tube 10.

The operating portion 17b is rotated to screw the connecting member 17 onto the nut 14, and the connecting member 17 is connected to the chromatography tube 1.
Press it onto the end face of 0.

As a result, the backing 18 is crushed, and the connecting member 17 is tightly connected to the chromato tube 10 via the backing 18, and the through hole 10a of the chromato tube 10 and the communication hole 17d of the connecting member 17 are communicated with each other.

Screw the connecting member 17 to firmly connect the glass chromato tube 1.
0, the rotational force of the connecting member 17 is not directly transmitted to the chromatography tube 10 , so no rotational force acts on the male threaded portion 12 of the chromatography tube 10 , and the connecting member 17 Only the linear force of the nut 14 (the force that moves the nut 14 in the direction of the connecting member 17) due to the screwing operation acts, and only the static load acts on the male threaded portion 12.

Furthermore, since the total surface area of this male threaded portion 12 is larger than the flange portion 2a of the glass chromato tube 2 in the connection structure shown in FIG. Even if the connecting member 17 is brought into tight contact with the glass chromato tube 10 by force, there is no risk of the male threaded portion 12 being damaged.

A tube for supplying a sample is connected to the nozzle part 17c provided at the tip of the connecting member 17, a stopper is screwed into the male threaded part 17e formed at the rear of the nozzle part 17c, and the tube is connected with this stopper. It is clamped and fixed to the member 17.

The sample supplied from the tube passes through the internal flow hole 17d of the connecting member 17, fine dust is removed by the filter 19, and the sample is passed through the filling 11 of the glass chromato tube 10 and tested as described above. .

This sample is pressurized to a pressure of 50 to 6 atm by a pump and supplied to the connecting member 17, but as mentioned above, the connecting member 17 and the glass chromatography tube 10 are tightly attached with strong pressure via the backing 18, The sample does not leak to the outside from the connection between the two members 10.17.

The seal connection structure shown in FIG. 2 has a backing part 21 integrally molded on the lower surface of the connection member 20, and since the connection member 20 is molded from synthetic resin as described above, the backing part 21 is integrally molded with this 20. can do.

By screwing the connecting member 20, the backing part 21 is crushed by the end face of the glass chromatography tube 22 to exert a sealing function, and it is not necessary to mold the connecting member and the backing separately as in the above embodiment. There isn't.

In the seal connection structure shown in FIG. 3, a male taper part 23a is formed at the lower part of the connection member 23, and a female taper part 24 including a through hole 24a is formed on the upper surface of the glass chromato tube 24.
b, the shapes of these 23a and 24b are matched, and a backing 25 is interposed between the tapered portion 23a and the tapered portion 24b.

In this embodiment, the wedge effect of the tapered portion 23a allows the glass chromato tube 24 and the connecting member 23 to be more closely connected.
can be connected.

FIG. 7 is a half-cut sectional view showing a seal connection structure for two glass chromato tubes.

Externally threaded portions 32.33 are cut into the ends of two glass chromatography tubes 30.31 having through holes 30a and 31a, respectively, and nuts 34.35 are loosely screwed into these portions 32 and 33.

Nuts 34, 35 have female threads 36, 37, which fit with the male threads 32, 33, and one female thread 3, respectively.
8 and 39 are formed.

At both ends of the connecting member 40, male threaded portions 41.42 that match the female threaded portions 38.39 are protruded.

Two glass chromato tubes 30.31 as shown in Figure 7.
When the connecting member 40 is screwed into the nut 34.35 with both end faces facing each other, the backing 43.44 is crushed and the two chromatography tubes 30.31 are connected via the connecting member 40. be done.

This allows the through hole 30 of the glass chromatography tube 30.
a, 31a are communicated by a passage 40a of the connecting member 40, allowing fluid to flow from one chromatography tube to the other.

Connecting a plurality of glass chromato tubes in this way has been required in various fields since it is difficult to form a single long glass chromato tube.

In this case as well, since the same seal connection structure as in the above embodiment is adopted, there is a risk that the glass chromato tube 30.31 will be damaged even if the connecting member 40 is brought into tight contact with the glass chromato tube 30.31. There is no such thing.

As is clear from the above description, according to the present invention, a male threaded portion is formed on the glass chromatography tube and the connecting member, and a nut is provided with a two-stage female threaded portion that matches the respective male threaded portions. It is screwed onto a glass chromato tube, and the connecting member is screwed onto a nut to be crimped onto the chromato tube.
Only the linear force of the static load from the nut acts on the glass chromato tube, and since the total surface area of the male threaded section of the chromato tube is large, there is no risk of the male threaded section being damaged, and the strength is The connecting member can be connected to a low-temperature glass chromatography tube with a sufficiently large pressure force.

Furthermore, according to the present invention, the sample being pumped under high pressure will not leak from the connection between the glass chromatography tube and the connection member, which are the most important parts.

Samples such as sake and soy sauce can be tested reliably without any damage to glass chromato tubes.

Furthermore, according to the present invention, since it is possible to connect two glass chromatography tubes with the seal connection structure,
It is also possible to eliminate the complicated and troublesome work of manufacturing long glass chromato tubes, and it is possible to connect two glass chromato tubes with a sufficiently large pressure force, making it widely used in various fields. It is highly practical as it exhibits various features such as the ability to

[Brief explanation of drawings]

The drawings show preferred embodiments of the present invention, and FIG. 1 is a half-cut sectional view showing a seal connection structure of a glass chromato tube;
FIG. 2 is a partially enlarged sectional view showing a partially modified example of the embodiment according to FIG. 1, and FIG. 3 is a second partially enlarged sectional view showing a further partially modified example.
4 is a sectional view showing a conventional seal connection structure for a glass chromato tube; FIGS. 5 and 6 are plan views of parts constituting the conventional seal connection structure in FIG. 4; FIG. 7 is a half-cut sectional view showing an example in which the seal connection structure according to the present invention is used to connect two glass chromato tubes. In the drawing, 10, 22, 24, 30.31 are glass chromato tubes, 14, 34.35 are nuts, 17.20, 2
3 and 40 are connection members.

Claims (3)

[Scope of utility model registration request] (1) The end of the glass chromatography tube 10 is made into a large diameter part, and the male screw part 12 is formed on the outer periphery of the large diameter part.The end part has a circulation hole 17d through which the liquid sample passes, and the rotation diameter is larger than that of the main body 17a. The end of the synthetic resin connecting member 17 shaped like the operating part 17b is made into a small diameter part smaller than the large diameter part of the end of the glass chromatography tube 10, and a male screw part 16 is formed on the outer periphery of the end part. A synthetic resin nut 1 is an independent member that connects the glass chromatography tube 10 and the synthetic resin connecting member 17.
On the inner periphery of the glass chromatography tube, two female threaded parts 13.15 of large diameter and small diameter, which are compatible with the male threaded parts 12.16 of the large diameter and small diameter, are formed coaxially and continuously. A large diameter female threaded part 13 formed on the inner periphery of the synthetic resin nut 14 is loosely screwed into a male threaded part 12 formed on the outer periphery of the large diameter end portion of the synthetic resin nut 14. By grasping and rotating the rotary operation part 17b, which has a larger diameter than the main body 17a of the connecting member 17, the small diameter male screw part 16 formed on the outer periphery of the end of the connecting member 17 is inserted into the inner periphery of the synthetic resin nut 14. The connecting member 17 is screwed into the small-diameter female threaded portion 15 coaxially continuous with the large-diameter female threaded portion 13, and the connecting member 17 is screwed in the direction of the glass chromato tube 10. A seal connection structure for a glass chromato tube, characterized in that the connecting member 17 is brought into close contact with the glass chromato tube 10 under strong pressure by crushing the backing 18 interposed between the end face of the glass chromato tube and the end face of the connecting member 17. . (2) The seal connection structure for a glass chromato tube according to claim 1, wherein the backing is integrally formed on the end face of the synthetic resin connection member. (3) In the utility model registration claim described in claim 1, an acid taper portion formed on the end face of the glass chromato tube, and an end face of the synthetic resin connecting member to correspond to the shape of the acid taper portion. A seal connection structure for a glass chromato tube, characterized in that the backing is interposed between the formed male taper part.