JPH028215Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a constant temperature device for chromatography.
More specifically, it relates to the improvement of a constant temperature device for gas chromatographs.

(b) Conventional technology Conventionally, during gas chromatograph analysis, heating was applied to the column at a constant temperature in order to maintain the column at a relatively arbitrary position within the column tank and keep the temperature inside the column constant and uniform. Air was forced or naturally circulated.

However, in this method, the temperature inside the bed differed slightly depending on the location due to causes such as heat leakage from the column body to the outside of the tank and stagnation of heated air inside the tank. Therefore, the difference in temperature distribution makes the temperature between the inlet and the outlet of the column non-uniform, making it difficult to reproduce analytical data.

(c) Purpose of the invention This invention was created in view of these circumstances, and aims to improve the reproducibility of analytical data by making the temperature distribution uniform between the inlet and outlet of the column. .

(d) Structure of the device The structure of this device consists of an insulated column tank body, a suction or blowing fan inside this body, and a bowl-shaped fan that expands coaxially toward the opposite side of the fan. , a partition plate having a through hole in the center of the narrow part, a heater to be appropriately installed in the air circulation path formed by the partition plate in the column tank body, a coiled column, and a coil shaft of this column passed through the partition plate. A column holder is provided on the opposite side of the fan through the hole and is held coaxially with the fan shaft, and the heated air blown into the coil of the column crosses the coil and is directed from the inner surface of the coil to the outer surface. This is a constant temperature device for chromatography, in which a streamline forming means is provided in a column coil of a column holder to form streamlines of the heated air.

As the streamline forming means used in this invention, it is preferable to use a fan as in the embodiment, but another preferable example is to use a plurality of rectifying plates.

(e) Examples This invention will be described in detail based on the examples shown in the figures below. Note that this invention is not limited to this.

First, in FIG. 1, a constant temperature apparatus 1 for a gas chromatograph consists of a rectangular parallelepiped insulated column tank main body 2, a main body fan (blower) 3 of this main body, and a main body fan (blower) 3 coaxially facing the fan axis. A partition plate 5 which has an expanding bowl shape and has a through hole 4 in the center of its narrow part, and a heater 6 installed as appropriate in the air circulation path formed by this partition plate in the column tank body 2.
and a column holder 7 inside the column tank body 2. Note that 8 and 9 are a sample vaporization chamber and a detector, and 10 is a motor for the main body fan 3.

The column holder 7 consists of a cylindrical holder case 11 appropriately attached to the inner wall of the column tank main body 2,
Further, this case is located near the entrance of the partition plate enlarged opening on the opposite side from the main body fan 3 through the partition plate passage hole 4, and its cylindrical axis is directed coaxially with the partition plate passage hole 4.

Furthermore, as shown in FIG.
2 is held with its coil axis coaxial with the cylindrical axis of the case, and a cylindrical inner case 14 is held within the coil of the column coaxially with the coil axis, and further inside the inner case there is a cylindrical inner case 14 coaxial with the cylindrical axis. blower fan 1
3 is held by radial arms 16, 17, and 18.

Further, the inner case 14 and the holder case 11 have a large number of holes 15, 19 (or slits) formed in their cylindrical surfaces, and both cases are molded from a heat-resistant material such as aluminum or stainless steel.

Next, a method for uniformly heating the separation column 12 using the gas chromatograph constant temperature apparatus 1 having the above configuration will be described.

First, heated air heated to a constant temperature is heated to a constant temperature by the activated heater 6 and the main body fan 3 for forced circulation of the heated air. Air is blown toward the inner wall of the column tank body 2 on the opposite side of the fan 3,
Collision against the inner wall. Then, by the suction force of the main body fan 3 that operates as a suction fan inside the partition plate 5, the heated air is reversed toward the column holder 7 without being stagnated.
It is introduced into the inner case 14 inside the column holder.

Subsequently, this heated air is blown out in a direction perpendicular to the cylindrical axis of the inner case 14 and radially from the cylindrical axis while being stirred by the blowing fan 13 in the inner case. and numerous holes 1 in the inner case.
5, the flow of this heated air is rectified and the heated air is uniformly blown onto the inner side of the coil surface of the column 12.

Next, the column is uniformly heated across the column 12 from the inside of the coil surface of the column 12, and the heated air exiting to the outside of the coil surface is blown out from the numerous holes 19 of the holder case 11 and directed to the main body fan 3 side. It reverses direction, passes through the partition plate through hole 4, and reaches the front of the main body fan 3. Then, the main body fan 3 heats the column 12 by its blowing force, so that the heated air whose temperature has been reduced is returned to the vicinity of the heater 6, where it is again raised to a constant temperature and circulated.

By repeatedly circulating heating electricity at a constant temperature in this way and uniformly applying heated air at a constant temperature to the column 12 fixed at a specific position within the column tank body 2 along the streamline from the inside to the outside, The column 12 can be heated uniformly, thereby making the temperature distribution uniform between the inlet and the outlet of the column 12, thereby improving the reproducibility of analytical data.

Further, as another embodiment, instead of the blower fan in the inner case 14, a plurality of rectifying plates that form substantially the same streamlines as the blower fan may be provided in the inner case 14.

(F) Effect of the invention A column holder for holding a coiled column in a fixed position is provided in the column tank body, and a streamline forming means is provided in the column coil of this holder, and air is blown into the column coil by this means. By directing the heated air across the coil from the inner surface to the outer surface of the coil, a uniform temperature distribution from the inlet to the outlet of the column can be achieved, thereby improving the reproducibility of analytical data.

[Brief explanation of drawings]

Fig. 1 is an explanatory sectional view showing an embodiment of the thermostat for chromatography according to this invention, Fig. 2 A and B are views showing this column holder, A is its front view, and B is a fan inside thereof. FIG. 1... Constant temperature device for gas chromatograph, 2...
Column tank body, 3... Body fan, 5... Partition plate, 6... Heater, 7... Column holder, 12...
...Column, 13...Blower fan.

Claims (1)

[Scope of utility model registration request] An insulated column tank body, a suction or blowing fan within this body, and a bowl-shaped partition that expands coaxially to the fan axis and toward the opposite side of the fan, and has a through hole in the center of its narrow part. A plate, a heater appropriately installed in the air circulation path formed by the partition plate in the column tank body, a coiled column, and a fan connected to the coil axis of this column on the opposite side of the fan through the partition plate through hole. a column holder held coaxially with the column, and further includes a column holder to form streamlines of the heated air blown into the coil of the column so that the heated air crosses the coil and goes from the inner surface to the outer surface of the coil; A constant temperature device for chromatography that includes a streamline forming means within the column coil of the column holder.