JPH02259561A - Gas chromatograph - Google Patents

Abstract

PURPOSE:To lower the temp. of the wall of an oven and the temp. of the air in the oven almost at the same rate by allowing the cold air for depriving heat from the oven wall to flow not only along the inner oven wall but along the outside. CONSTITUTION:The column oven is formed by a heat-insulating material 11 and the oven wall 12, and an oven door 13 is provided to close the oven and to prevent escape of the heat in the column when a sample is analyzed and so on. A temp. controlling flap 15 is vertically directed while the temp. is controlled to close the space in the column, and horizontally directed during the cooling to introduce cold air. A fan 14 is driven to horizontally rotate the flap 15, and cold air is introduced into the space W, circulated in the space and discharged from the flap part as hot air. The insulating material 11 on the side surface is separated from the oven wall 12 in synchronization with the rotation of the flap 15 with point P as the center, hence a gap is formed between the oven wall 12 and the insulating material 11, and cold air flows into the gap. Consequently, the oven wall 12 is cooled from both surfaces, cold air is brought into contact with the insulating material surface, and the oven is rapidly cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION (6) Field of Industrial Application The present invention relates to gas chromatographs, particularly column ovens.

(b) Conventional technology A cross-sectional view of the overall structure of the gas chromatograph is shown in FIG.

Reference numeral 1 indicates a sample injection section, 2 indicates a column, and 3 indicates detection components. These components are surrounded by an oven wall 4, a metal plate constituting a heat insulating material 5, and an oven door, and housed in a companion oven chamber.

7 is a heater, and the heated air is circulated in the room by a fan 8 and a heater trap. Note that the flap 9 is oriented vertically during heating by the heater 7, thereby sealing the inside of the chamber.

Reference numerals 7'j and 10 are bulkheads, and when cooling the inside of the oven chamber, the foot 9 is placed horizontally to the bulkhead 10 (the rotary flap 90 is not shown), and the passage under the bulkhead 10 is used to cool the room temperature. Air is forced into the tank, and the heat inside the oven chamber is discharged from the passage above the partition wall 10 and cooled by this cold air.Note that 11 indicates the wall of the mesh, and 12 indicates the fan motor.

(c) Problems to be Solved by the Invention However, with the conventional configuration, even if it was desired to cool the oven chamber in a short time, the temperature of the oven wall itself did not come down easily, making it nearly impossible to cool the oven chamber in a short time.

Also, after confirming that the temperature of the air inside the oven has dropped, close the oven door flap. Since the temperature of the oven wall has not dropped, the air inside the oven will be warmed by the heat from the wall and will rise again. It also had drawbacks such as an increase in temperature.

Accordingly, one object of the present invention is to provide an apparatus that can lower the temperature of the oven wall at a rate comparable to the temperature of the air inside the oven chamber.

The present invention solves the above problems and quickly lowers the temperature of the oven wall by causing the cold air that removes heat from the oven wall to not only flow along the inner wall of the oven but also to the outside. The feature is that it also allows the flow of water.

The specific configuration is that a gas chromatograph column oven in which the oven wall is surrounded by a heat insulating material is provided with a heat insulating material separating means for separating only the heat insulating material from the oven wall during cooling in the cuff oven. It is something.

Here, the heat insulating material separating means may be one in which a motor, a timing belt, a pulley, and a gear are connected.

(E) Function According to the present invention, during cooling, the heat insulating material placed outside (in contact with) the oven wall is separated from the oven wall, and cold air is introduced between the oven wall and the heat insulating material.

(f) Example Embodiments of the present invention will be described based on the drawings.

FIG. 11(a) is a top view of the gas chromatograph according to the present invention, and FIG. 1(b) is a side view.

11 is a heat insulating material, 12 is an oven wall, and a column oven for a gas chromatograph is purchased with these. A column (not shown), a heater (not shown), a fan 14, etc. are accommodated in the space W of the column oven. Also, 1
3 is the oven door.

Seal the column oven to prevent heat from escaping during sample analysis.

Reference numeral 15 denotes a temperature control flap, which faces vertically to seal the space when the column (not shown) is temperature controlled, and faces horizontally to take in cold air during cooling.

The temperature control flap 15 is connected to the motor 1 via the bevel gear 16i.
7 and is rotated by the motor 17.

In addition, the motor 17 is 18°18
', and pulleys 19 and 19', and are connected to a gear 20, whereby the heat insulating material 11 rotates about a point Pi.

Note that 21 represents a fan motor, and 22 represents a partition wall.

In the above configuration, the inside of the gas chromatograph is cooled as follows.

First, the fan 14 is rotated by the 44-karat gold fan motor 21, and the motor 17 is caused to rotate fully to move the flap 15 in the horizontal direction. Then, cold air (air at room temperature) enters the space W, circulates within the space W, and exhausts hot air through the flag section.

In the present invention, the insulation material 11 on the side is separated from the oven wall 12 around point P in synchronization with the rotation of the flag 5, and a gap is created between the oven wall 12 and the insulation material 11, and the cold air flows through this gap. flows.

The state diagram at this time is the second (3).

As a result, the oven walls are cooled from both sides, and the heat insulating material surface is also cooled by cold air, allowing rapid oven cooling.

Note that the means for separating the oven wall and the heat insulating material is the same as in the above embodiment (
There are no limitations, and any material may be used as long as it can appropriately create a gap with the oven wall.

(g) Effects According to the present invention, since cold air flows also outside the oven wall, the oven cooling time can be shortened, and the waiting time t between one analysis can be shortened. This also allows efficient use of the device.

[Brief Description of the Drawings] Figure 1 (a) is a top view of a gas chromatograph using the VcfiA of the present invention, Figure 1 (b) is a side view, and Figure 2 is a view of the gas chromatograph when the oven wall and heat insulating material are separated. Figure 3 is a conventional figure.

Claims (1)

[Scope of Claims] 1. A gas chromatograph column oven in which the oven wall is surrounded by a heat insulating material, characterized by comprising a heat insulating material separation means for separating only the heat insulating material from the oven wall when the column oven is cooled. Gas chromato tap.