JPH0241584Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a column oven for chromatography, and in particular, uses a fan to forcefully circulate and discharge air inside the tank (inside the oven) to the outside of the tank, and to suction the air outside the tank to increase the capacity of the housing part of the column. When controlling the temperature to a low temperature, by configuring the suction path and exhaust path of the air outside the tank to be short-circuited, a large negative pressure is not suddenly generated in the suction side space of the fan, and the excess air outside the tank is This prevents the temperature of the column storage area from being disturbed due to air infiltration.

The sample inlet vaporization chamber and detector of a gas chromatograph are typically set at high temperatures (eg, 350° C.). On the other hand, the temperature of the column connected to the vaporization chamber and the detector, that is, the temperature of the housing part of the column, is generally determined by the initial temperature of a low value ( For example, it may be set to 40℃). In this case, the temperature of the housing portion of the column rises naturally due to heat leakage (conduction heat) from the vaporization chamber and the detector, and it is often impossible to maintain the set temperature unless some kind of cooling energy is provided. The air outside the tank can be used as the cold source. However, when this air from outside the tank is introduced into the housing part of the column by the suction force of the fan and the opening/closing of the flap in the suction path, the state of negative pressure on the suction side suddenly changes before and after opening/closing the flap. At times, a large amount of air outside the tank flows in, causing the temperature of the housing portion of the column to drop instantaneously, making temperature control difficult and making it impossible to obtain the desired control accuracy. Furthermore, a large negative pressure was generated in the suction side space of the fan, and excess air outside the tank was sucked through the gap around the fan motor shaft. In some cases, in gas chromatographs, air cooled by a separately attached cooling device is sucked in to control the temperature of the column housing part to a low value, but When humid air enters through gaps, condensation can form on heater insulation insulators, causing functional problems.

This idea was devised in view of these circumstances, and its specific configuration consists of a column housing section and an impeller placed inside a chromatography column oven body equipped with a sample inlet vaporization chamber and a detector. a circulation channel that forcibly circulates the air in the accommodation section of the column; an outside air suction channel that leads to the suction side of the impeller from the outside via a flap; and a discharge channel that leads to the outside from the discharge side of the impeller via the flap. Furthermore, a short-circuit path for the suction/discharge path is provided on the side of the circulation flow path from the flap of these suction/discharge paths, and the outside air suction path and the discharge path are arranged adjacently in parallel, and the suction/discharge path is The flap of the discharge passage is constituted by one common flap that rotates around the boundary wall of both passages, and furthermore, the short-circuit passage of both passages is disposed close to the central axis of this common flap, and This is a column oven for chromatography that opens and closes short circuits to maintain a constant temperature in the housing section of the column.

That is, the present invention provides a suction path on the suction side of the impeller and a discharge path on the discharge side, and also provides a short-circuit path that short-circuits the suction path and the discharge path, and also connects these three flow paths into one. Opening and closing can be controlled by a common flap, avoiding large fluctuations in air inflow and outflow, thereby enabling smooth temperature control.

In other words, a short-circuit path is provided for the suction path and the discharge path, and these three flow paths are opened and closed by one specific common flap, so the total opening of the suction/drain path and the short-circuit path is always approximately Therefore, regardless of whether the suction/discharge path is opened or closed, there is almost no pressure change on the suction side and discharge side of the impeller, thereby achieving smooth temperature control. This makes it possible.

This invention will be explained in detail below based on the embodiments shown in the figures. Note that this invention is not limited to this.

First, in FIG. 1, a gas chromatograph column oven 1 has a sample inlet vaporization chamber 4 and a detector 5 installed on the ceiling wall 3 of a main body 2, and a vaporization chamber 4 in a column housing part 6 in the main body 2. 4 and a column 7 connected to a detector 5 are suspended.

Further, in the main body 2 of the column oven 1, there is formed a circulation channel 8 which is separated from the column accommodation section 6 and forcibly circulates the air in the accommodation section, and a circulating air fan 9 is installed in this circulation channel. ing. This Shirotsuko fan 9 is equipped with a suction impeller 11 on the back side in addition to a circulation impeller 10 on the main body. In addition, 12 is the partition wall, 13 is its suction port,
14 and 14' are discharge ports. Further, 15 is a fan motor of the Sirotskov fan 9, and 16 is an electric heater disposed around the periphery of the Sirotskov fan.

An outside air suction path 17 and a discharge path 18 are formed in the circulation flow path 8, and the outside air suction path is configured to communicate with the suction side of the suction impeller 11 from the outside via a flap 19. It is configured to be adjacent to and parallel to the outside air suction path 17 and communicated with the outside via the flap 20 from the discharge side of the circulation impeller 10. Further, both flaps 19 and 20 are constructed as an integral common flap, and 21 is a common central axis thereof;
22 is a pulse motor for operating the common flap.

Furthermore, the outside air suction path 17 and the exhaust path 18 have a short circuit path 23 on the circulation flow path 8 side from the common central axis 21,
It is constructed so that it can be opened and closed by the common flap.

Next, the operation of the gas chromatograph column oven 1 constructed as described above will be explained (see FIGS. 3 to 3).

First, if you want to set the sample inlet vaporization chamber 4 and the detector 5 to a high temperature (e.g., about 350°C), and set the column accommodation part 6 to around room temperature (e.g., about 40°C), then Since the temperature exceeds room temperature due to heat leakage (conduction heat) from the detector 5, etc., by opening the flaps 19 and 20 as shown in FIG. It is sucked into the circulation channel 8. The Sirotskov fan 9 that has sucked the outside air further circulates and supplies the sucked outside air to the accommodation section 6 of the column, and discharges the high-temperature air from the accommodation section through the discharge passage 18. If the amount of outside air to be sucked is too large and the temperature of the column accommodation portion drops, the opening degree of the flaps 17 and 19 is limited as shown in FIG. 3, and further closed if necessary to control the temperature to a predetermined temperature.

By the way, in the outside air suction path 17 and the exhaust path 18,
A short-circuit path 23 is provided and can be opened and closed as shown in FIGS. 1 to 3 in response to the opening and closing operations of the flaps 19 and 20. Therefore, when the outside air suction path 17 is closed (partially closed) by the flap 19 as shown in FIG. Since the air which is to be discharged through the passage 18 enters through the opened short circuit 23,
There is no excessive infiltration of outside air from gaps around the fan motor 15 shaft due to large negative pressure.

Furthermore, when opening the flap 19 of the outside air suction path 17, the short-circuit path 23 with the exhaust path 18 is simultaneously opened.
Since the column is opened, it is possible to prevent a large amount of outside air from being introduced into the circulation flow path 8 at a time and disturbing the temperature inside the column storage section 6.

Note that the circulation impeller 10 in the above embodiments
Depending on the structure around the fan, a single impeller can function as the suction impeller 11.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a column oven for chromatography according to this invention;
The figure is a partially enlarged view illustrating its operation. 1... Column oven for gas chromatograph,
2...Main body, 4...Sample injection port vaporization chamber, 5...Detector, 6...Column housing part, 7...Column,
8...Circulation channel, 10...Circulation impeller, 11...
Suction impeller, 12... partition wall, 17... outside air suction path, 18... discharge path, 19, 20... flap, 23... short circuit path.

Claims (1)

[Scope of Claim for Utility Model Registration] A chromatography column oven body equipped with a sample inlet vaporization chamber and a detector includes a column housing section and an impeller for forced circulation of air in the column housing section. a circulation flow path, an outside air suction path leading from the outside to the suction side of the impeller via a flap;
It is equipped with a discharge passage leading from the discharge side of the impeller to the outside via a flap, and furthermore, a short-circuit passage for the suction and discharge passages is provided on the circulation flow passage side from the flap of these suction and discharge passages, and an outside air suction passage and a discharge passage are provided. are arranged adjacent to each other in parallel, and the flaps of these suction and discharge passages are composed of one common flap that rotates around the boundary wall between the two passages, and furthermore, the short-circuit passage of both passages is connected to this common flap. A column oven for chromatography that is located close to the central axis of the column and whose common flap opens and closes a short circuit to maintain a constant temperature in the housing section of the column.