JPH1123553A - High speed cooling oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high speed cooling oven of high cooling efficiency uniformly diffusing cooling gas in the oven. SOLUTION: A separation column 6, a heater 8 for heating, and a fan 9 are provided in a vessel body 1, in addition an introducing port 3 for introducing cooling gas is provided on the front face side of the vessel body, meanwhile a motor 12 for driving the fan 9 is provided on the rear face side of the vessel body 1, a through hole 11 for inserting through the driving shaft 121 of the fan 9 is openingly provided on the rear face side of the vessel body 1, the hole diameter is set larger than the diameter of the driving shaft 121, and a gap (g) for discharging cooling gas is provided between the through hole 11 and the driving shaft 121.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed cooling oven provided in, for example, a gas chromatography apparatus.

[0002]

In an oven provided to raise the temperature of a separation column in a gas chromatography apparatus, the temperature of the separation column is raised to a predetermined temperature by a heater to separate a specific substance, and then the next measurement is performed. For example, a cooling gas such as liquid N ₂ was introduced into the container body to rapidly cool the inside.

[0003] However, the cooling gas has been arbitrarily discharged to the outside through a gap between the container body and the lid. In such a case, since the cooling gas may be discharged only from the unbalanced portion, even within the container body, the cooling gas flows only partially to the space, and may not evenly reach the inside, Sometimes the inside was not cooled uniformly. In addition, the cooling efficiency is low, and cooling takes a relatively long time.

[0004] The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a high-speed cooling oven having high cooling efficiency, in which a cooling gas can be uniformly spread in an oven.

[0005]

According to the present invention, means for solving the above-mentioned problems are constituted as follows. That is, a separation column, a heater for heating and a fan are provided in the container body, and an inlet for introducing cooling gas is provided on the front side of the container body, while the fan is provided on the rear side of the container body. A motor for driving the fan is provided, and a through hole for inserting the drive shaft of the fan is opened on the rear surface side of the container body, and the diameter of the hole is set to be larger than the diameter of the drive shaft. A gap for cooling gas discharge is provided between the hole and the drive shaft.

[0006] The cooling gas introduced from the front side of the container body is uniformly cooled while being stirred by a fan and discharged to the outside through a gap on the rear side, whereby uniform cooling becomes possible and cooling efficiency is improved. I do.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-speed cooling oven according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a high-speed cooling oven. Reference numeral 1 denotes a rectangular container body, 2 denotes a lid provided at the front opening of the container body 1, and 3 denotes a cooling gas provided to the lid 2. Inlet for 4
Is a heat insulating material lined in the container body 1, 5 is a sample inlet, 6 is a separation column, 7 is a detector, 8 is a heater for raising the temperature of the separation column, 81 is a heater wire, 9 is a fan,
Reference numeral 10 denotes a back plate, and 11 denotes a through hole formed through the back plate 10 and the heat insulating material 4 to allow a drive shaft 121 of a motor 12 directly connected to the fan 9 to pass therethrough. The diameter is set to be 3 to 4 mm larger than the diameter of 121, and an annular gap g for discharging the cooling gas is formed between the through hole 11 and the drive shaft 121. Reference numeral 13 denotes a support member for the motor 12, which is attached to the back plate 10 (see FIG. 2).

At the rear side of the through hole 11, a hole closing device 13 for operating a throttle mechanism by a solenoid is provided. To prevent hot air from leaking to the outside. 14 is a support member for the motor 12,
It is attached to the back plate 10. In addition, the rear casing 15 of the container body 1 has a cut-and-raised 1 for discharging the cooling gas.
51 are formed.

With such a configuration, when the measurement is started, the gap g is closed by the hole closing device 13, and the separation column 6 is uniformly heated and heated by the heater 8 while the fan 9 is rotating. The adsorbed specific substance is separated (see FIG. 3A). Next, for the next measurement, the heater 8 is turned off, the hole closing device 13 is opened to form a gap g, and a cooling gas such as liquid N ₂ is introduced from the inlet 3 and rapidly cooled (FIG. 3). (B)). At that time, the cooling gas is evenly and evenly spread inside while rotating the fan 9, and the cooling gas is discharged to the outside through the gap g provided on the rear surface side of the container body 1, so that the inside is uniform. It is possible to cool quickly and efficiently.

Conventionally, it takes a relatively long time to return to the original temperature after the cooling is started by turning off the heater 8 and the cooling is not uniform. Cooling gas is discharged from the rear while being evenly distributed inside, enabling uniform high-speed cooling, improving cooling efficiency, significantly improving work efficiency in continuous measurement, and controlling cooling temperature below room temperature. In this case, the temperature in the oven is made uniform, and the reliability is improved.

FIG. 4 shows a different embodiment of the high-speed cooling oven, in which a diffuser 21 for diffusing the gas is attached to the cooling gas inlet 3. The diffuser 21 is provided with a plurality of fins so that the introduced cooling gas can be diffused uniformly in the radial direction. Since the cooling gas can be sufficiently diffused in front of the separation column 6, the fan 9 The cooling effect can be further uniformed in synergy with the stirring effect. Although not shown, a stirring blade that is rotated by the introduced cooling gas may be attached to the inlet 3.

[0012]

As described above, according to the high-speed cooling oven of the present invention, the inlet for introducing the cooling gas is provided on the front side of the container body, and the fan drive is provided on the rear side of the container body. A through hole for inserting the shaft is made larger than the drive shaft, and a gap for cooling gas discharge is provided between the through hole and the drive shaft. After being evenly spread, the air is discharged to the outside through the gap on the rear surface side, so that uniform cooling is possible and the cooling efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a high-speed cooling oven of the present invention.

FIG. 2 is a sectional view of the through hole and a drive shaft.

FIG. 3A is an explanatory diagram when the temperature of the separation column is raised, and FIG. 3B is an explanatory diagram when the internal column is cooled.

FIG. 4 is a sectional view of another embodiment of the high-speed cooling oven.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container main body, 3 ... Inlet, 6 ... Separation column, 8 ... Heater, 9 ... Fan, 11 ... Through-hole, 12 ... Motor, 121
... drive shaft, g ... gap.

Claims (1)

[Claims] 1. A separation column, a heater for heating and a fan are provided in a container body, and an inlet for introducing a cooling gas is provided on a front side of the container body, while a rear side of the container body is provided. A motor for driving the fan is provided, and a through hole for inserting the drive shaft of the fan is opened on the rear surface side of the container body, and the hole diameter is set to be larger than the diameter of the drive shaft. A high-speed cooling oven, wherein a gap for discharging cooling gas is provided between the through hole and the drive shaft.