JP3200771U - Connecting member set - Google Patents

Abstract

A connecting member set used in a TOC meter for accurately measuring a TOC concentration in a sample aqueous solution is provided. A tube includes a combustion tube filled with a catalyst therein and a sample introduction mechanism 45 having a sample flow path disposed at an upper end of the combustion tube, and includes a tube 51 through which a sample aqueous solution flows. In the connecting member set 50, the outlet end of the tube 51 has a flared shape, and is formed in a cylindrical shape that is disposed in the sample flow path, and is disposed in the sample flow path. A fixing member 52 that presses the outlet end of the tube 51 downward is provided on the upper surface of the sleeve member 53. [Selection] Figure 4

Description

  The present invention is the concentration of TOC (total organic carbon) in sample water solutions such as river water, lake water, seawater, rainwater, groundwater, and other sample water such as water and sewage water, pharmaceutical water, pure water, industrial water, and wastewater. It is related with the connection member set used for the total organic carbon meter (TOC meter) etc. which measure A.

In recent years, measurement of the TOC concentration contained in sample aqueous solutions such as water and sewage water, water for various plants, and rivers has become one of the important items for pollution investigations and the like.
The most common measurement method for measuring the TOC concentration in the sample aqueous solution is to use a non-dispersible infrared gas detector (NDIR detector) that detects the CO ₂ concentration after burning the sample aqueous solution in the combustion tube. In this method, the TC (total carbon) concentration and the IC (inorganic carbon) concentration in the sample aqueous solution are individually measured, and the TOC concentration is calculated based on the following formula (1) (see, for example, Patent Document 1).
TC = TOC + IC (1)

In order to calculate an accurate TOC concentration by such a measuring method, it is necessary to introduce a desired amount of the sample aqueous solution into the combustion tube with extremely high accuracy.
Here, an example of a schematic configuration of a general TOC meter will be described with reference to FIG.
The TOC meter 101 includes a sample injector 30, a combustion unit 40, a connecting member 150 for connecting the sample injector 30 and the combustion unit 40, and an NDIR detector 60 that detects CO ₂ concentration information.

  The sample injector 30 includes a syringe pump 31 and a valve 33. The first connection part of the valve 33 is connected to the sample introduction tube 20, the second connection part of the valve 33 is connected to the combustion part 40 via the connection member 150, and the third connection part of the valve 33 is a syringe. The pump 31 is connected. The valve 33 connects the sample introduction tube 20 and the syringe pump 31, or connects the combustion unit 40 and the syringe pump 31.

  The syringe pump 31 includes a cylindrical syringe 31a, a columnar piston 31b inserted into the syringe 31a, and a pulse motor 32 that moves the piston 31b in the vertical direction. When the piston 31b is pulled downward in a state where the syringe pump 31 is connected to the sample introduction tube 20, the sample aqueous solution is injected into the syringe 31a. Further, when the piston 31b is pushed upward in a state where the combustion unit 40 and the syringe pump 31 are connected, a desired amount (for example, 100 μl) of the sample aqueous solution in the syringe 31a is supplied to the combustion unit 40. .

5 and 6 are cross-sectional views showing examples of the combustion section 40 and the connecting member 150. FIG.
The combustion unit 40 includes a quartz glass combustion tube 41, an electric furnace (heating furnace) 42 that is disposed around the combustion tube 41 and heated to about 680 ° C., a carrier gas introduction mechanism 43, a slide port (sample introduction). Mechanism) 45 and a drain pipe 46.
The combustion tube 41 is filled with a known oxidation catalyst 44, and the lower end portion of the combustion tube 41 is connected to the NDIR detector 60.

The carrier gas introduction mechanism 43 is a plate-like body installed at the upper end portion of the combustion tube 41, and inside the plate-like body is a circular tube-shaped sample channel 43a penetrating in the vertical direction and in the left-right direction. A circular tube-shaped carrier gas channel 43b is formed.
According to such a carrier gas introduction mechanism 43, the carrier gas (for example, oxygen gas having a purity of 99.99%) circulated to the left in the carrier gas flow path 43b passes through the combustion pipe 41 at 150 ml / min. When the sample aqueous solution flows downward in the sample flow path 43a, the TOC in the sample aqueous solution is evaporated and decomposed by the electric furnace 42 and reaches the oxidation catalyst 44 together with the carrier gas. Then, it is oxidized by the oxidation catalyst 44 to become CO ₂ . The CO ₂ is guided to the NDIR detector 60 together with the carrier gas.

The slide port 45 is a plate-like body, and a sample channel 45a penetrating in the vertical direction is formed in the slide port 45. Sample flow path 45a has an upper, consists of a lower part the upper part of the inner diameter r ₁ is smaller than the inner diameter r _2, the inner peripheral surface of the upper sample flow channel 45a is formed with a screw groove. The slide port 45 is movable (slidable) in the left-right direction, and the sample channel 45 a is either the upper end of the sample channel 43 a of the carrier gas introduction mechanism 43 or the upper end of the drain tube 46. It is arranged at the position.

Here, FIG. 7 is a cross-sectional view showing a state in which the connecting member 150 of FIGS.
The connecting member 150 includes a tube 151 made of Teflon (registered trademark) having a circular tube shape (inner diameter r ₃ , outer diameter r ₄ ), and a fixing member 152 having a through-hole having a diameter r ₄ . Fixing member 152 includes an upper 152a of cylindrical consists of a lower portion 152b of cylindrical shape which is the outer diameter _{r 5} is less than the outer diameter _{r 1} of the upper 152a, the outer peripheral surface of the lower 152b, sample flow slide ports 45 A thread groove corresponding to the inner peripheral surface of the upper portion of the path 45a is formed.

  When attaching such a connecting member 150 to the combustion unit 40, the measurer first passes the Teflon tube 151 through the through hole of the fixing member 152, and then rotates the fixing member 152 while moving the fixing member 152. The sample is inserted into the sample channel 45a, and the fixing member 152 is screwed to the sample channel 45a. In this way, the outlet end of the Teflon tube 151 is arranged in the sample channel 45a.

  When the sample aqueous solution is analyzed using the above-described TOC meter 101, the measurer or the like moves the slide port 45 so that the sample channel 45a and the drain pipe 46 communicate with each other as shown in FIG. Then, the sample aqueous solution is discharged to the drain tube 46 until the inside of the Teflon tube 151 is sufficiently cleaned. Thereafter, the slide port 45 is moved so that the sample channel 45 a communicates with the sample channel 43 a of the carrier gas introduction mechanism 43 as shown in FIG. 5 and a desired amount of the sample aqueous solution is introduced into the combustion tube 41.

JP-A-9-43224

  However, the TOC meter 101 as described above may not be able to accurately measure the TOC concentration.

  The present inventors examined a TOC meter that can accurately measure the TOC concentration in a sample aqueous solution. As a preparation for analyzing the sample aqueous solution with the TOC meter 101, the measurer or the like arranges the outlet end of the Teflon tube 151 in the sample flow path 45a of the slide port 45. The outlet end of the Teflon tube 151 to be used is Even when the outlet end of the Teflon tube 151 is cut at a right angle, it may not be arranged straight in the sample flow path 45a. As a result, the sample aqueous solution was not injected straight into the combustion tube 41 due to these problems. As a result, it was found that some of the sample aqueous solution was not oxidized due to insufficient contact with the oxidation catalyst 44.

In some cases, a SUS injection needle is inserted into the Teflon tube 151, but there is a problem that rust is generated due to the sample properties and the effect of acid added to the sample aqueous solution and clogs during use.
Therefore, the present inventors have found a method of arranging a cylindrical resin sleeve member having an outlet end formed at a right angle at the outlet end of the tube. By using this sleeve member, the sample aqueous solution could be injected straight into the combustion tube.

  That is, the connecting member set of the present invention is used in an apparatus including a combustion tube filled with a catalyst inside and a sample introduction mechanism having a sample flow path disposed at an upper end portion of the combustion tube. A connecting member set including a circulating tube, and a tubular resin sleeve member disposed in the sample flow path, and an outlet of the tube on the upper surface of the sleeve member disposed in the sample flow path And a fixing member that presses the end downward.

  As described above, according to the connecting member set of the present invention, when the outlet end of the tube is arranged in the sample flow path, the measurer or the like makes the sample aqueous solution straight to the combustion tube without making any difficult adjustments. It becomes possible to inject, and a high-performance apparatus can be realized.

(Means and effects for solving other problems)
In the above device, the apparatus includes a heating furnace disposed around the combustion tube and a drain tube, and the sample flow path of the sample introduction mechanism includes an upper end portion of the combustion tube and the drain tube. You may form so that it can move between the upper-end parts.

  Further, in the above device, the sample flow path has an upper inner diameter larger than a lower inner diameter, and the sleeve member has an upper outer diameter larger than a lower outer diameter. A screw groove is formed on the outer peripheral surface and the inner peripheral surface of the upper part of the sample channel, and the upper part of the sleeve member is placed on the upper surface of the lower part of the sample channel, and the upper surface of the upper part of the sleeve member After the outlet end of the tube is placed, the fixing member may be screwed in the sample channel.

The schematic block diagram which shows an example of the TOC meter using the connection member set which concerns on this invention. Sectional drawing which shows the structural example of the combustion part which concerns on this invention, and a connection member set. Sectional drawing which shows the decomposition | disassembly state of the combustion part which concerns on this invention, and a connection member set. The perspective view which shows the connection member set which concerns on this invention. Sectional drawing which shows an example of the combustion part at the time of the analysis in a common TOC meter, and a connection member. Sectional drawing similar to FIG. 5 which shows an example of the combustion part at the time of drain pipe communication, and a connection member. Sectional drawing which shows the decomposition | disassembly state of the combustion part and connection member of a general TOC meter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and it goes without saying that various aspects are included without departing from the spirit of the present invention.

FIG. 1 is a schematic configuration diagram showing an example when the connecting member set according to the present invention is used in a TOC meter. 2 is a cross-sectional view showing an example of the configuration of the combustion section and the connecting member set according to the present invention, and FIG. 3 is a cross-sectional view similar to FIG. It is. In addition, about the thing similar to the TOC meter 101 mentioned above, description is abbreviate | omitted by attaching | subjecting the same code | symbol.
The TOC meter 1 includes a sample injector 30, a combustion unit 40, a connecting member set 50 for connecting the sample injector 30 and the combustion unit 40, and an NDIR detector 60 for detecting CO ₂ concentration information. .

FIG. 4 is a perspective view showing a connecting member set 50 according to the present invention.
Connecting member 50 is provided with a Teflon flared tube 51 the outlet end 51a is in the shape of flared such that the diameter r _1, a fixing member 52 having a through hole with a diameter r _4, through the diameter r ₃ A sleeve member 53 having a hole, a rubber ring-shaped (inner diameter r ₄ , outer diameter r ₁ ) O-ring 54, and a resin ring-shaped (inner diameter r ₄ , outer diameter r ₁ ) washer 55; Is provided.

Fixing member 52 includes an upper 52a having a cylindrical shape, consists of a lower part 52b of the cylindrical shape having an outer diameter _{r 5} is less than the outer diameter _{r 1} of the upper 52a, on the outer peripheral surface of the lower 52b, sample flow slide ports 45 A thread groove corresponding to the inner peripheral surface of the upper portion of the path 45a is formed.

The sleeve member 53 includes an upper 53a having a cylindrical shape and a lower 53b with made cylindrical outer diameter _{r 1} is smaller than the outer diameter _{r 2} of the top 53a. Such a sleeve member 53 is a resin molded product, and the shape thereof is accurately molded. That is, the outlet end of the through hole of the sleeve member 53 is formed at a right angle, and the through hole of the sleeve member 53 is arranged straight in the sample channel 45 a of the slide port 45.

  Examples of the resin material forming the sleeve member include ETFE, PCTFE, PFA, PTFE, and PEEK (registered trademark).

  Here, the attachment method which attaches the connection member set 50 which concerns on this invention to the combustion part 40 is demonstrated. First, a measurer or the like inserts and arranges the sleeve member 53 into the sample channel 45 a of the slide port 45. At this time, the upper portion 53a of the sleeve member 53 is placed in contact with the upper surface of the lower portion of the sample channel 45a, and the lower portion 53b of the sleeve member 53 is disposed in the lower portion of the sample channel 45a.

Next, the measurer or the like causes the flare tube 51 to penetrate through the inside of the annular washer 55, the inside of the annular O-ring 54, and the inside of the fixing member 52. Next, the measurer or the like brings the inner surface of the outlet end 51a of the flare tube 51 into contact with the upper surface of the upper portion 53a of the sleeve member 53 disposed in the sample flow path 45a of the slide port 45, and then moves the fixing member 52 through the sample flow. The fixing member 52 is screwed into the sample channel 45a while being inserted into the channel 45a while being rotated. At this time, the outlet end 51a of the flare tube 51 is disposed in the sample channel 45a so that the outlet end 51a of the flare tube 51 is pressed against the upper surface of the upper portion 53a of the sleeve member 53.
Note that a normal tube may be used instead of the flare tube 51, and a connection using a ferrule may be used.

  As described above, according to the TOC meter 1 according to the present invention, when the outlet end 51a of the flare tube 51 is arranged in the sample channel 45a of the slide port 45, the measurer does not make any difficult adjustments. The aqueous sample solution can be injected straight into the combustion tube 41, and a high-performance TOC meter 1 can be realized.

<Other embodiments>
In the TOC meter 1 described above, the configuration in which the sleeve member 53 is inserted and arranged in the sample channel 45a of the slide port 45 is shown, but instead, the sleeve member is formed in the sample channel of the slide port. It is good also as such a structure.

  The present invention is a total organic carbon that measures the TOC concentration in sample water such as river water, lake water, seawater, rainwater, groundwater, water and sewage water, pharmaceutical water, pure water, industrial water, wastewater, etc. It can be used for calculation.

1 TOC meter (device)
41 Combustion tube 44 Oxidation catalyst 45 Slide port (sample introduction mechanism)
45a Sample channel 50 Connecting member set 51 Flare tube 51a Outlet end 52 Fixing member 53 Sleeve member

Claims (3)

A combustion tube filled with catalyst inside,
Used in an apparatus comprising a sample introduction mechanism having a sample flow path disposed at the upper end of the combustion tube;
A connecting member set including a tube through which an aqueous sample solution flows,
A cylindrical sleeve-shaped resin member disposed in the sample flow path;
A connecting member set, comprising: a fixing member that presses an outlet end of the tube downward on an upper surface of the sleeve member disposed in the sample flow path. The apparatus includes a heating furnace disposed around the combustion pipe, and a drain pipe,
The connecting member according to claim 1, wherein the sample flow path of the sample introduction mechanism is formed to be movable between an upper end portion of the combustion tube and an upper end portion of the drain tube. set. The sample channel has an upper inner diameter larger than a lower inner diameter,
The sleeve member has an upper outer diameter larger than an outer diameter of the lower part,
On the outer peripheral surface of the fixing member and the inner peripheral surface of the upper part of the sample channel, thread grooves are formed,
After the upper part of the sleeve member is placed on the upper surface of the lower part of the sample channel and the outlet end of the tube is placed on the upper surface of the upper part of the sleeve member, the fixing member is screwed in the sample channel. The connection member set according to claim 1, wherein the connection member set is stopped.

Images