JPH0416224Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a column oven for gas chromatography, and particularly relates to the structure of the wall of the column oven.

(B) Prior Art In gas chromatography, column temperature affects the distribution coefficient and therefore has a large effect on retention time. Therefore, a column tank equipped with a heating device is used to perform gas chromatography analysis while maintaining the optimum retention time.

Column ovens equipped with a heating device are generally preferred because they have a large internal volume, and columns of various lengths and shorts can be used, and operations such as column installation can be performed easily. be done. However, if the internal volume of the column oven is large, the capacity of the heating device and cooling device installed will be large, but depending on the purpose of analysis, the length of the column will be reduced and the volume it occupies will be small. In some cases, unnecessarily vacant space was heated and cooled, which was a waste of energy. As described above, conventional column ovens have a wasteful structure in terms of energy efficiency, which has been considered a problem.

(C) Purpose This invention solves the energy usage problems of conventional column ovens for gas chromatography analysis, and is a gas chromatography system that can adjust the internal volume according to the number of columns used in the column oven. The present invention provides a column oven for tograph analysis.

(D) Structure The present invention provides a column oven for gas chromatographs that has a column inlet/outlet and is equipped with a heater and a fan inside. The cooling gas introduction path and gas exhaust path are
In front of the fan, there is a partition plate formed by flaring around a perforated plate, and on the side wall of the column oven chamber, there is a pair of foldable double-opening partition walls with hinges. is provided, and at the time of partitioning, a part of the wall member of the partition wall is placed between the column inlet/outlet in front of the perforated plate and the column holding position, so that the column inlet/outlet in front of the perforated plate A column oven for a gas chromatograph is characterized in that a column oven chamber is partitioned between the column holding position and the column holding position.

In the present invention, a gas inlet passage and a gas outlet are provided on the wall behind the fan of the column oven chamber so that heating and cooling gases can be introduced and discharged from the side opposite to the column inlet/outlet of the column oven chamber. Each channel opens separately.

The partition wall in the present invention is one that can be opened and closed, for example, a folding door type partition wall or an expandable partition type partition wall. These partition walls are formed of a heat-resistant material, for example, a heat-resistant and corrosion-resistant metal plate such as stainless steel. When the partition wall is closed, it serves, for example, as a guide wall for hot air and cold air, and also as a heat insulating wall.
Therefore, by partitioning the column inlet/outlet, that is, the opening of the oven chamber, and the column holding position with a partition wall, hot air and cold air can be effectively used to heat and cool the column.

(E) Example The figure is a schematic plan cross-sectional view of an example of the column oven of the present invention. Hereinafter, one embodiment of the present invention will be described in detail with reference to this figure, but the present invention is not limited to this explanation in any way.

A column oven 1 is surrounded by a wall 2. In the oven chamber 3 formed inside,
An opening, that is, a column inlet/outlet 7 is provided for loading and unloading the columns, and two separation columns 4, for example, one on the standard side and one on the measurement side, are held in the center thereof. The separation column 4 has an inlet end 5 serving as a sample vaporization chamber (not shown).
The outlet end 6 communicates with a detector (not shown). A pair of left and right partition walls 8 in the form of folding doors that can be opened and closed are provided between the separation column 4 and the column entrance/exit 7 of the oven chamber 3. In this figure, reference numeral 8 indicates a state in which the partition wall is closed, and reference numeral 8' indicates a state in which the partition wall is folded and opened. This partition wall is made of stainless steel, and the end portion of the first wall member 9 is rotatably supported by a support 10, and the first wall member 9 and the second wall member 1
1 are rotatably connected by a hinge 12.
A partition plate 13 is provided at the back of the separation column 4 to form a circulating flow of hot air and cold air.
A flare 15 is provided around the perforated plate 14. A fan 16 is provided behind the perforated plate 14 of the partition plate 13, and a guide plate 17 is provided surrounding the fan 16. A heater 18 is disposed between the partition plate 13 and the guide plate 17, and heats the airflow passing therethrough.

A gas introduction passage 19 and a gas discharge passage 20 are open at the rear of the fan 16 of the column oven 1, and both are operated by pulse motor-driven on-off valves 21 and 22.
is provided. The opening/closing valves 21 and 22 adjust the amount of gas passing through by appropriately changing their angles. In the figures, the partition wall 8' is specifically shown to show the folded condition.

In the present invention, in addition to providing the partition wall 8, the gas introduction passage 19 and the gas discharge passage 20 are also provided behind the fan of the column oven, so that, for example, when using a short column 4, both The partition walls are both placed at the position 8 in the figure to block the hot air and cold air flowing into the oven chamber 3 from the opening, so that the hot air and cold air flow between the opening in the column oven chamber and the column holding position. It flows only up to the vicinity of the partition wall 8 that partitions the air, preventing unnecessary heating and cooling. In addition, when using a long column, the column installation port must be replaced with another installation port (not shown), but since the column 4 is installed to fill the entire oven chamber 3, , both partition walls 8
By folding both of them to the position 8' in the figure, hot air and cold air flowing into the oven chamber 3 from the gas introduction path 19 can be sufficiently flowed to the vicinity of the column inlet/outlet port 7. Therefore, even if the internal volume of the column oven 1 is large, unnecessary heating and cooling can be avoided.

(f) Effect The present invention provides a partition wall that can be opened and closed between the column inlet/outlet of the column oven and the column holding position, and also connects the gas inlet passage and the gas discharge passage behind the fan of the column oven to the column oven. Since each oven is opened separately into the chamber, even if a column oven with a large internal volume is used, the volume of the oven chamber can be adjusted depending on the degree of use of the oven chamber.
Even if a short column is used, unnecessary heating and cooling can be avoided, and power consumption and coolant such as liquid carbonic acid can be reduced.

As described above, the present invention is superior to conventional column ovens in terms of energy savings, and its effects are significant.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional plan view of an embodiment of the column oven of the present invention. In the figure, 1 is a column oven, 2 is its wall,
3 is an oven chamber, 4 is a separation column, 5 is an inlet end, 6 is an outlet end, 7 is a column inlet/outlet, 8
1 is the partition wall and the position where the partition wall is closed, 8' is the position where the partition wall is open, 9 is the first wall member, 10 is the support column, 1
1 is a second wall member, 12 is a hinge, 13 is a partition plate,
14 is a perforated plate, 15 is a flare, 16 is a fan, 1
7 is a guide plate, 18 is a heater, 19 is a gas introduction path,
20 is a gas discharge path, and 21 and 22 are on-off valves.

Claims (1)

[Scope of utility model registration request] In a gas chromatograph column oven that has a column inlet/outlet and is equipped with a heater and a fan inside, there is a gas inlet passage for heating and cooling that can be opened and closed on the wall behind the fan of the column oven chamber of the column oven. The discharge passages are each open, and a partition plate formed by flaring around a perforated plate is provided in front of the fan, and a folding type double door with hinges is installed on the side wall of the column oven chamber. A pair of partition walls is provided, and at the time of partition, a part of the wall member of the partition wall is placed between the column loading/unloading port in front of the perforated plate and the column holding position, so that the front part of the perforated plate is A column oven for a gas chromatograph, characterized in that a column oven chamber is partitioned between a column inlet/outlet and a column holding position.