JPS59182360A - Thermostatic chamber of chromatograph - Google Patents

Abstract

PURPOSE:To increase the cooling speed in a thermostatic chamber and to enable constitution into a relatively small size by blowing forcibly air into said chamber by means of a fan in the stage of cooling. CONSTITUTION:When a fan 3 installed in a thermostatic chamber 4 constituted of a heat insulating material rotates, the air heated with a heater 9 installed around the same is agitated and a column 10 installed on the left side of a heater mounting plate 8 is uniformly heated. On the other hand, when a shutter 16 formed with holes 20a, 20b at two upper and lower points is vertically moved by means of a pulse motor 17 to the position shown by a broken line, the holes match with the holes 15a, 15b formed on the right side of the chamber 4. Therefore the cold air in a case 13 fed by a fan 14 is forcibly introduced through the hole 15b into the chamber 4 and the hot air in the chamber is released through the upper hole 15a and an evacuating draft 6 directly into the outdoor air. The temp. in the chamber 4 is decreased quickly without opening the door 21.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a constant temperature bath used in a chromatograph, and particularly to a constant temperature bath for a gas chromatograph in which air is forcibly blown in by a fan during cooling. .

[Prior art]

FIG. 1 is a vertical cross-sectional view of a conventional thermostat of a gas chromatograph. Fans 2.3 are attached to both ends of the rotating shaft of the motor 1, and the fans 2 suck out the air inside the case 13 and exchange it with outside air to cool the motor 1 and the inside of the case 13. The fan 3 in the other thermostatic chamber 4 stirs the air in the thermostatic chamber 4 made of heat insulating material.During the experiment, the flap 7 is set vertically to seal the exhaust duct 6. The temperature inside the thermostat 4 is maintained at a uniform temperature. Furthermore, there is a heater mounting plate 8) around the sirocco-shaped fan 3. : There is a locked heater 9, and a partition plate 5 is provided behind the fan 3 and in the center of the exhaust duct 6.

The air inside the constant temperature chamber 4 of such a gas chromatograph is
The temperature is kept uniform by the stirring action of the fan 3 rotated by the motor 1. When you want to quickly lower the temperature inside the tank,
The flap 7 is rotated clockwise to be fully opened, allowing outside air to enter the thermostatic chamber 4 through the lower passage of the partition plate 5, and exhausting warm air in the chamber through the upper passage of the partition plate 5. Note that at this time, the current flowing through the heater 9 is cut off. Moreover, when it is desired to keep the inside of the thermostatic chamber 4 slightly higher than room temperature, the opening degree of the flap 7 of the exhaust duct 6 is adjusted by decreasing it.

In conventional thermostatic chambers configured in this way, the outside air and the air inside the chamber are exchanged through the exhaust duct, but this exchange is mainly done by convection, so it is difficult to reduce the temperature inside the chamber to a predetermined value. has the disadvantage that it takes a lot of time.

FIG. 2 is a vertical cross-sectional view of another conventional gas chromatograph constant temperature chamber, in which the same parts as in FIG. 1 are designated by the same reference numerals. In this case, the right side is the constant temperature bath 4, and the column 10
The chamber accommodating the is partitioned off by a partition plate 5a. A fan 3 is installed on the left side of the central protrusion of the partition plate 5a,
It is rotated by a motor 1. Therefore, the air heated by the heater 9 is sent into the thermostatic chamber 4 by the fan 3, and flows out to the outside of the partition plate 5a to be circulated. Further, the motor 1 is surrounded by another partition plate 5b that partitions the inside of the case 13, and rotates the fan 2 to cool the area around the motor 1. Further, a flap 14a is provided in the upper space between the partition plate 5b and the case 13, and a flap 1 is provided in the lower space.
4b is installed.

When you want to cool down the temperature inside the constant temperature bath 4, use the flap 14a.
, 14b are opened and outside air is introduced from the top and fed into the thermostatic chamber 4, and the heated air is released from the bottom in the direction of the arrow. In this case as well, since the outside air is introduced and discharged only by convection due to the suction force of the sirocco fan 3, the cooling rate is slow.

Furthermore, since it is necessary to provide a space for opening and closing the flap 14, there is a drawback that the device becomes larger.

That is, as shown in side 2 above, conventional thermostatic chambers for gas chromatographs have the disadvantage that it takes time to cool down the temperature within the thermostatic chamber after the temperature has risen, and the apparatus is large in size.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a constant temperature chamber for a chromatograph that has a fast cooling rate for the temperature inside the constant temperature chamber and can be constructed in a relatively small size.

[Summary of the invention]

The features of the present invention include: a pair of holes provided in the wall of the thermostatic chamber containing the column; and two holes installed close to each other outside the thermostatic chamber wall so that the pair of holes can be opened and closed at the same time. an exhaust duct that communicates the inside of the thermostatic chamber with outside air when one hole of the shutter matches one of the holes of the thermostatic chamber, and the other hole of the shutter communicates with the other hole of the thermostatic chamber wall. At the same time, a fan is provided to flow cold air into the thermostatic chamber, and the temperature within the thermostatic chamber can be adjusted by adjusting the position of the shutter.

[Embodiments of the invention]

FIG. 3 is a vertical sectional view of a constant temperature bath of a gas chromatograph according to an embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In this case, a fan 2, a fan 14, and a sirocco-type fan 3 are attached to the rotating shaft 19 of the motor 1, and the fan 2 sucks in outside air from the center and exhausts it from the periphery of the fan 2 to cool the inside of the case 13. do. On the other hand, when the fan 14 rotates, it tries to introduce the air inside the case 13 into the thermostatic chamber 4, but this is blocked by the shutter 16 when the temperature inside the thermostatic chamber 4 is rising as shown in FIG. , acts to agitate the air inside the case 13.

Note that the shutter 16 has holes 2Qa and 20 at two locations, upper and lower.
b is provided, and a rotating threaded rod 18 fed by the rotation of a pulse motor 17 is screwed into a threaded hole on the side whose lower end is bent into an L shape.

The fan 3 is installed in the constant temperature chamber 4 made of a heat insulating material, and when the fan 3 rotates, it stirs the air heated by the heater 9 installed around it. The column 1o was heated uniformly. Furthermore, the radiant heat of the heater 90 is cut off by the heater mounting plate 8, thereby preventing the 5 columns 10 from reaching locally different temperatures. It is connected to a sample introduction section 11 and a detector 12 installed on the top surface of the sensor 4. In addition, the insulation board on the left side of the thermostatic chamber 4 is s2
The inner lining of the case 13 is used to open the door and replace the column 10. Also, a plurality of feet 22 are attached to the lower side of the case 13.

FIG. 4 is a right side view of the shutter of FIG. 3.

As mentioned above, the shutter 16 has two button holes 2Qa, upper and lower.

20b is formed, so when it is moved vertically to the position shown by the broken line, the hole 15 formed on the right side of the thermostatic chamber 4
Matches 8,15b. therefore.

The cold air inside the case 13 sent by the fan 14 is
5b into the constant temperature chamber 4, and the hot air in the constant temperature chamber passes through the upper hole 15a and the exhaust draft 6 and is directly discharged into the outside air. This makes it possible to rapidly lower the temperature inside the thermostatic chamber 4 without opening the door 21, allowing you to start the next experiment or replace the column 1O, improving experimental efficiency. do.

In addition, by adjusting the amount of movement of the shutter 16, the holes 15 and 20 are
By adjusting the matching degree to 1/2 or 173, the cooling rate can be controlled. Therefore, by using a microcomputer to calculate the amount of cold air introduced (the amount of movement of the shutter 16) using the set temperature and room temperature,
The temperature inside the tank can be precisely controlled to the set temperature.

The constant temperature chamber of the gas chromatograph of this example has two holes at the top and bottom of the rear side wall, and the upper hole communicates with the exhaust duct trap, and the upper end of the lower hole is passed through the motor rotating shaft, and the upper hole and the exhaust duct are connected to each other. By lowering the shutters interposed between the ducts and between the lower hole and the intermediate fan, the intermediate fan forces cold air into the thermostatic chamber, and the warm air inside the thermostatic chamber is released into the outside air through the exhaust duct. can be released.

This allows the temperature inside the thermostatic chamber to be rapidly cooled or rapidly brought close to the set temperature, improving experimental efficiency. Further, since a plate-shaped shutter is used without using a flap, effects such as a relatively compact structure can be obtained.

The above embodiment describes a constant temperature bath for a gas chromatograph, but if the column 10 is replaced with a liquid chromatography column filled with ion exchange resin or the like and passing a buffer solution, it can also be used as a constant temperature bath for a liquid chromatograph. Can be used. In addition, the intermediate fan 14 attached to the rotating shaft 19 in Fig. 3 is attached with opposite pressure to the fan 2 in the air blowing direction, but it is convenient to change the air blowing amount if it is attached to a separate motor. However, this is not preferable because the configuration of the device is complicated and expensive. Furthermore, the vertically movable shutter 16
Alternatively, there is a method of controlling by providing a flap 7 for opening and closing the holes 158, 15b, but this is not preferable because it tends to occupy a large space.

〔Effect of the invention〕

The constant temperature bath for a chromatograph according to the present invention has the advantage that the temperature inside the bath can be set quickly and can be constructed in a small size.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a constant temperature chamber of a conventional gas chromatograph, FIG. 2 is a vertical cross-sectional view of a constant temperature chamber of another conventional gas chromatograph, and FIG. 3 is a constant temperature chamber of a gas chromatograph that is an embodiment of the present invention. A vertical sectional view of the tank, FIG. 4 is a right side view of the shutter of FIG. 3.

Claims (1)

[Scope of Claims] 1. A pair of holes provided in the wall of a constant temperature chamber containing a column, and two holes installed close to each other outside the wall of the constant temperature chamber so that the pair of holes can be opened and closed at the same time. an exhaust duct that communicates the inside of the constant temperature chamber with outside air when one hole of the shutter matches one hole of the constant temperature chamber wall; A constant temperature bath for a chromatograph, comprising a fan that causes cold air to flow into the constant temperature bath when communicating with the hole of the thermostatic bath, and the temperature in the constant temperature bath can be adjusted by adjusting the position of the shutter. 2. The constant temperature chamber for a chromatograph according to claim 1, wherein the shutter is a plate-like member that moves linearly with its side surface guided by a guide attached parallel to the outer wall surface of the constant temperature chamber. 3. A constant temperature chamber for a chromatograph according to claim 1, wherein the fan is a member attached to a part outside the constant temperature structure of a rotating shaft having a fan attached to the tip for stirring the inside of the constant temperature chamber.