JPH0443812Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a heat exchanger for a differential refractometer.

[Prior art] A differential refractometer measures the difference in refractive index between a sample liquid and a reference liquid in an optical cell, and since the temperature coefficient of the refractive index is as large as approximately 1×10 ^-5 , the temperature of both liquids is It is necessary to improve measurement accuracy by bringing the difference as close to zero as possible.

Therefore, in a heat exchanger for a differential refractometer, an optical cell is installed on a metal optical bench, and a thin tube through which the sample liquid passes is buried inside this optical bench, so that the temperature of both liquids is the same as the temperature of the optical bench. I am trying to make it equal to

The longer this tube is, the closer the temperature difference between the two liquids can be to zero, but since the components separated by the column are remixed, there is a limit to its length. Efforts have been made to improve heat exchange with the

For example, a spiral thin tube may be arranged coaxially within a spiral heater, and the space between the two may be filled with a mixture of metal powder and heat-resistant synthetic resin.
No. 10671), a linear groove is provided in the side wall of a metal optical bench, a linear thin tube is inserted into the groove, molten solder is poured between the groove and the thin tube, and the thin tube is buried within the optical bench. (Utility Model Application Publication No. 61-84860).

[Problems to be Solved by the Invention] Here, the optical cell may need to be replaced due to damage to the thin tube due to operational error or dirt inside. To replace the optical cell, it is first necessary to remove the capillary.

However, in the conventional heat exchanger described above, it is extremely difficult to remove the thin tubes. In particular, when using solder, it is necessary to heat and melt the solder when attaching or removing the thin tube, so the order of attaching and detaching heat-resistant parts must be considered.
Installation and removal were extremely difficult.

An object of the present invention is to provide a heat exchanger for a differential refractometer that has a good heat exchange rate between the sample liquid in the capillary tube and the optical bench, and in which the capillary tube can be easily replaced.

[Means for Solving the Problems] In order to achieve this objective, the present invention embeds a thin tube connected to the optical cell inside a metal optical bench on which the optical cell is installed, and the thin tube is connected to the optical cell. A heat exchanger for a differential refractometer that exchanges heat between a sample liquid flowing therein and the optical bench is made of a metal with good thermal conductivity, such as aluminum,
It is characterized in that the thin tube is tightly wound around a metal block made of brass, copper, etc., and is fitted inside the metal optical bench.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

(1) First Embodiment As shown in FIG. 1, an optical cell 12 is installed inside a housing groove 11 of an optical bench 10. This optical cell 12 consists of a sample liquid chamber 12a and a reference liquid chamber 12b.

On the other hand, the thin tube 14 is tightly wound around the metal block 16. That is, the metal block 16 has a shape in which a spiral groove 18 is carved on the outer circumferential surface of a cylinder, and the thin tube 14 is fitted along the spiral groove 18 and wound tightly around the metal block 16.

The optical bench 10 is made of metal and has a groove 2 on its side wall.
0 is engraved. This groove 20 consists of a holder fitting groove 20a with a rectangular cross section and a block fitting groove 20b with a semicircular cross section carved into the bottom of the holder fitting groove 20a, and the metal block 16 is inserted into this groove 20b. The halves are mated. Threaded holes 22 are formed at the four corners of the bottom surface of the holder fitting groove 20a. A communication hole 24 is bored in the longitudinal side wall of the groove 20, through which one end of the thin tube 14 is inserted and connected to the optical cell 12. In addition, the holder fitting groove 20
A holder 26 is fitted into a. This holder 26
A block fitting groove 26a having the same shape as the block fitting groove 20b is cut into one side of the metal block, into which the remaining half of the metal block is fitted. That is, the metal block 16, around which the thin tube 14 is tightly wound, is fitted into the receiving hole formed by the pair of block fitting grooves 20b and 26a.

Holes 28 are bored in the four corners of the holder 26, and bolts 30 are inserted into each hole and then screwed into the screw holes 22 to fasten the holder 26 to the optical bench 10.

Therefore, the bolt 30 is reversed and the holder 2
6 from the optical bench 10, the thin tube 1
4 and the metal block 16 can be easily attached to the optical bench 10.
The capillary tube 14 can be easily replaced.

Here, for the following reason, heat exchange between the sample liquid in the capillary tube and the optical bench is sufficiently performed, and the temperature of the sample liquid flowing in the capillary tube 14 is lower than that of the optical cell 12a.
By the time the temperature reaches the temperature of the optical bench 10, the temperature difference between the sample liquid and the reference liquid in the optical cell 12 approaches zero.

The thin tube 14 fits into the fitting groove 20b of the metal block 16.
and is in close contact with the fitting groove 26a of the holder 26.

The thin tube 14 has a spiral shape, and the sample liquid flows while colliding with the inner wall of the thin tube.

Inner walls of grooves 20b and 26a and metal block 16
The contact area with the outer peripheral surface of the holder 26 and the contact area between the holder 26 and the optical bench 10 are relatively large.

Note that there is a slight gap between the thin tube 14 and the spiral groove 18, and a slight gap between the metal block 16 and the block fitting groove 20b.
A conductive paste may be applied between the joint surfaces with 26a. In addition, corresponding to the spiral groove 18, a spiral groove may also be carved on the inner circumferential surface of the holder fitting grooves 20a and 26a.

(2) Second Embodiment FIG. 3 shows the main configuration of the differential refractometer of the second embodiment. The same components as in FIG. 1 are given the same numbers, and similar Components are given the same number with '' added.

In this embodiment, a holder 26' having the same shape as the holder 26 is used, and a metal block 1 with a thin tube 14 tightly wound around a housing hole formed by overlapping the holders 26 and 26' is used.
6 is fitted. Further, a groove 20' having a rectangular cross section is carved in the side wall of the optical bench 10'.
The holders 26 and 26' are overlapped and fitted thereto. Further, a screw hole 22 is formed in the side surface of the optical bench 10' on the groove 20' side, and a hole 28 is bored in the side plate 32 corresponding to the screw hole 22, and a bolt 30 is inserted into this hole 28. , the side plate 32 is screwed into the screw hole 22 and fastened to the side surface of the optical bench 10'. This prevents the metal block 16 from coming off the holders 26, 26' and the holders 26, 26' from the optical bench 10', and improves the degree of adhesion between the metal block 16 and the holders 26, 26'. Heat conduction between the holder 26, 26' and the optical bench 1
0' becomes more efficient.

In this second embodiment as well, the metal block 16 can be easily removed by simply reversing the bolts 30 and removing the side plate 32 from the optical bench 10', making it extremely easy to replace the thin tube 14. It can be carried out.

Note that, as in the case of the first embodiment, the holder 26
A conductive paste may be applied between the joint surfaces of the holders 26 and 26' and on the outer peripheral surfaces of the holders 26 and 26'.

Furthermore, in each of the above embodiments, the material of the optical benches 10, 10', which have relatively large volumes, is made of aluminum, and the material of the metal blocks 16, holders 26, 26', which have relatively small volumes, are made of copper, thereby increasing the cost. It is possible to suppress the heat exchange rate and increase the heat exchange rate.

[Effect of the invention] In the heat exchanger for a differential refractometer according to the invention, a thin tube tightly wound around a metal block is fitted inside a metal optical bench, so that the sample flowing into the thin tube is An advantage is that this capillary can be replaced very easily without reducing the thermal efficiency between the liquid and the optical block.

[Brief explanation of the drawing]

1 to 3 relate to embodiments of the present invention, in which FIG. 1 is an exploded perspective view showing the configuration of main parts of the differential refractometer of the first embodiment, and FIG. 2 shows the thin tube 14 shown in FIG. FIG. 3 is an enlarged front view of the metal block 16 and an exploded perspective view showing the configuration of the main parts of the differential refractometer of the second embodiment. 10, 10'...optical bench, 12...optical cell,
14...Thin tube, 16...Metal block, 20a...
...Holder fitting groove, 20b, 26a...Block fitting groove, 26, 26'...Holder, 32...Side plate.

Claims (1)

[Claims for Utility Model Registration] (1) A thin tube connected to the optical cell is buried inside a metal optical bench on which the optical cell is installed, and a sample liquid flowing inside the thin tube is connected to the optical bench. A heat exchanger for a differential refractometer that performs heat exchange between the two, characterized in that the thin tube is tightly wound around a metal block and fitted inside the metal optical bench. exchanger. (2) The metal block has a shape in which a spiral groove is carved on the outer circumferential surface of the cylinder, and the thin tube is fitted along the spiral groove to form a cylindrical shape formed by a pair of semicircular grooves in cross section. A heat exchanger for a differential refractometer according to claim 1, characterized in that the heat exchanger is fitted into a hole.