JPH0619080Y2 - Gas chromatograph / infrared spectrophotometer device - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a gas chromatograph / infrared spectrophotometer device, and more specifically to an infrared spectrophotometer in which a component gas separated by a gas chromatograph is in a gas phase state. The structure of the infrared gas cell of the device for measuring the infrared absorption spectrum by
That is, it relates to the heating temperature control mechanism.

(B) Conventional technology In the conventional light pipe device of this type of infrared gas cell, a glass pipe whose inner surface is coated with gold is arranged through a through hole of a heating block around which a heating coil is wound. Infrared transparent window plates are attached to both ends of the glass pipe through metal joints having a feed pipe, and the feed pipe is held by a heating block by a cover plate, thereby positioning the light pipe device in the heating chamber. It was fixed (JP-A-61-162735).

(C) Problems to be solved by the invention In the heating temperature control mechanism in which the light pipe unit such as the light pipe, the feeding pipe, and the infrared transmission window plate is incorporated in the heating block as described above, manufacturing and maintenance of these However, it was relatively easy to position the light pipe unit only after the light pipe was inserted into the temperature control block so that the feed pipe could not be attached to both ends of this pipe. Further, it is not easy to replace the transparent window, and it requires skill to disassemble and assemble, and as a result, it is difficult for the user (user) to easily perform maintenance management.

It is an object of the present invention to provide a gas chromatograph / infrared spectrophotometer device capable of optimally maintaining the temperature control of a light pipe unit and easily disassembling, maintaining and assembling the unit. It is a thing.

(D) Means for Solving Problems The present invention relates to a gas chromatograph / infrared spectrophotometer device for measuring an infrared absorption spectrum of a component gas separated by a gas chromatograph in a gas phase state by an infrared spectrophotometer. (I) a light pipe, and first and second feeds for feeding the separated component gases which are respectively connected to the input end and the output end of the pipe so as to be located on substantially the same plane as the pipe. A substantially U-shaped light pipe unit consisting of a tube, and (ii) a temperature control mechanism consisting of a heater and a temperature sensor for controlling the temperature of the light pipe unit, this temperature control mechanism, and the light pipe unit inside. It has a light pipe temperature control block that enables embedding and temperature control, and sets the longitudinal direction of the light pipe in the optical axis direction of infrared light. Of the above-mentioned block is composed of two or more block parts which are divided by a plane including the light pipe, and a coupling means which is releasable and at least the light pipe unit is detachably coupled at the time of releasing the temperature control mechanism. And a gas chromatograph / infrared spectrophotometer device in which a light pipe unit can be embedded.

That is, the present invention is characterized in that the light pipe unit can be positioned and fixed only by assembling it between the block portions without disassembling.

(E) Action The light pipe unit is assembled with the first and second feed pipes connected to both ends of the light pipe unit in the first block portion fixed on the optical axis of infrared light. Positioning and fixing can be done by simply connecting the block parts of the unit, which facilitates assembly or removal by the user, and maintenance management can be done in the assembled state without disassembling the light pipe unit by simply releasing both block parts. You can
As a result, maintenance can be improved and its practicality is great. Further, since the light pipe unit can be embedded in the light pipe temperature adjusting block together with the temperature control mechanism including the heater and the temperature sensor, the light pipe unit is in close contact with the wall surface of the block and the heat is effectively transmitted to the light pipe unit. Also, the responsiveness in the temperature control mechanism is enhanced. Further, the heat capacity of the block improves the heat retention in the block.

(F) Embodiment Hereinafter, the present invention will be described in detail with reference to the drawings. The invention is not limited to this.

In FIGS. 1 and 2, a light pipe unit 1 of a gas chromatograph / Fourier transform infrared spectrophotometer device is formed in a substantially U shape, and includes a light pipe 2 and an input end 2a and an output end 2b of this pipe. To the pipe 2 so as to be located on substantially the same plane as the pipe 2, and comprises first and second feed pipes 3 and 4 for feeding the component gas separated by a gas chromatograph (not shown). .

Further, the light pipe temperature control block 5 incorporating the light pipe unit 1 therein is capable of releasing the two first and second block portions 6 and 7 which are divided by the plane including the light pipe 2 and both of these block portions. The light pipe unit 1 is temperature-controlled, and the longitudinal direction of the light pipe 2 is set to the same optical axis direction as the incident beam and the outgoing beam of infrared light.

Furthermore, a positioning groove 6a suitable for the shape of the light pipe unit 1 is formed on the inner surface of the first block portion 6,
Similarly, a positioning groove 7a is also formed in the second block portion 7, and both blocks 6, 6 are formed at the center of the lower end of the inner surface of the first block portion.
A positioning groove 7b that fits with the pin 6b is formed at the position of the second block portion 7 corresponding to the positioning pin 6b of No. 7.

The light pipe 2 is made of a glass pipe whose inner surface is coated with gold, and the first and second feed pipes 3 and 4 are provided with a copper wire 9 for improving heat conduction.
Is wrapped around.

On the other hand, in the first block portion 6, a heater 10 as a temperature control mechanism is embedded at both ends in the longitudinal direction, a temperature sensor 11 is embedded in the central portion, and the heater lead wire 1 is provided outside.
0a, the temperature sensor lead wire 11a is drawn out and connected to an external temperature control circuit (not shown).

The light pipe unit 1 is shown in FIGS.
As shown in the figure, it has a substantially U-shaped symmetrical shape, and gas can flow in from either the left or right side. The light pipe 2 whose inner surface is coated with gold can multiple-reflect infrared light. Further, light pipe ends 12 each having a thread on the light pipe insertion port 12a side are attached to both ends of the light pipe 2, and the light pipe ends are respectively the first and second feed pipes 3 and 4, and the KBr window. Board 13
And are integrally molded.

The light pipe 2 and each of the feeding pipes 3 and 4 are connected via the light pipe end 12. That is, the cap nut 14, the washer 15, the spring 16, the back ring 17, and the graphite ferrule 18 are sequentially inserted into the light pipe 2 from both ends of the light pipe toward the center of the pipe 2. After that, the light pipes 2 are inserted into the insertion openings 12 a of the light pipe ends 12 and screwed into the light pipe ends 12 with the cap nuts 14. At this time, the inner surface of the light pipe end 12 and the light pipe 2
Since the graphite ferrule 18 is provided through the space 20 even if gas leaks from the joint surface 19 with the outer surface of the, the gas can be more reliably sealed. Also,
Gasket 21 for gas sealing is provided on both sides of the KBr window plate 13 and is locked by a window plate locking ring 22 screwed to the light pipe end 12.

Next, the assembly procedure will be described.

First, the first block portion 6 is fixed on the optical system with the longitudinal direction of the light pipe 2 aligned with the optical axis direction of infrared light.
Next, the light pipe unit 1 is assembled in the groove 6a, the second block portion 7 is fitted in the pin 6b and the hole 7b, and the light pipe unit 1 is also assembled in the groove 7a.
By tightening the fixing screw 8, both the light pipe units 1 are held and fixed to the block portions 6 and 7.

Further, the removal can be easily performed by releasing the fixing screw 8 and performing the procedure reverse to the above.

Further, the light pipe 2 can be easily replaced by loosening the cap nut 14 of the light pipe unit 1. Then, the KBr window plate 13 can be easily replaced, and the maintenance can be improved.

The outer diameter of the light pipe end remains constant, but you can change the inner diameter to a light pipe with a different shape, such as the inner diameter.
It can be easily replaced without changing the grooves of both blocks.

(G) Effect of the Invention As described above, according to the present invention, the light pipe unit is fixed on the optical axis of infrared light together with the first and second feeding pipes having the light pipes connected to both ends. The light pipe unit can be easily assembled and removed by the user because it is positioned and fixed only by connecting the second block portion after it is assembled in the first block portion, and the light pipe unit is simply released by both the block portions. It can be maintained and managed in the assembled state without disassembling it, which can improve the maintenance and its practicality is great. Further, since the light pipe unit can be embedded in the light pipe temperature control block together with the temperature control mechanism including the heater and the temperature sensor, heat is effectively transmitted to the light pipe unit by closely contacting the wall surface of the block. Also,
The responsiveness in the temperature control mechanism is enhanced. Furthermore, the heat container in the block improves the heat retention in the block.

[Brief description of drawings]

1 (a) and 1 (b) are a front view and a side view, respectively, showing a state in which a light pipe unit according to an embodiment of the present invention is incorporated into a temperature control block, and FIG. 2 is an exploded perspective view of the temperature control block. FIG. 3 and FIG. 3 are exploded views of the structure of the light pipe unit, and FIG. 4 is a cross-sectional view of the main parts of the light pipe unit. 1 ... Light pipe unit, 2 ... Light pipe, 3 ... 1st feed pipe, 4 ... 2nd feed pipe, 5 ... Light pipe temperature control block, 6 ... 1st block part , 7 second block, 8 fixing screw, 10 heater, 11 temperature sensor, 12 light pipe end, 13 KBr window plate.

Claims (1)

[Scope of utility model registration request] 1. A gas chromatograph / infrared spectrophotometer apparatus for measuring an infrared absorption spectrum of a component gas separated by a gas chromatograph in a gas phase by an infrared spectrophotometer, comprising: (i) a light pipe and this pipe. A substantially U-shaped light, which is connected to the input end and the output end of the pipe so as to be located on substantially the same plane as the pipe, and includes first and second feed pipes for feeding the separated component gases. A pipe unit, and (ii) a temperature control mechanism including a heater and a temperature sensor for controlling the temperature of the light pipe unit, and (iii) this temperature control mechanism and the light pipe unit are embedded inside to enable temperature control. And a light pipe temperature control block that sets the longitudinal direction of the light pipe to the direction of the optical axis of infrared light. Gas chromatograph / infrared spectrophotometer device comprising two or more block parts divided by a plane including a light pipe, and a coupling means capable of releasing these block parts and detachably coupling at least the light pipe unit at the time of releasing. .