JP3146025U - Gas chromatograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas chromatograph using a gas chromatograph oven capable of preventing an operator from opening a door when the inside of a housing is hot.
SOLUTION: A housing 10 having a door 15 that can be opened and closed, a column 11 disposed inside the housing 10, a heater 13 that heats air inside the housing 10, and a temperature inside the housing 10 are detected. The gas chromatograph includes a gas chromatograph oven 1 including a temperature sensor 18, and includes a lock mechanism 19 that prevents the door 15 from being opened. The lock mechanism 19 has a temperature detected by the temperature sensor 18. When the temperature is equal to or higher than the set temperature, the door 15 is controlled so as not to be opened.
[Selection] Figure 1

Description

  The present invention relates to a gas chromatograph using a gas chromatograph oven that accommodates a column therein and adjusts the temperature of the column.

  In a gas chromatograph, a sample gas (sample) is pushed by a carrier gas and introduced into the column from the inlet end of the column. Thus, each measurement substance contained in the sample gas is separated in the time axis direction while passing through the column, and reaches the outlet end of the column. At this time, in order to pass the sample gas through the column at a predetermined temperature, a gas chromatograph oven is used in which the column is accommodated and the temperature of the column is adjusted (see, for example, Patent Document 1).

3 and 4 are schematic configuration diagrams of an example of a conventional gas chromatograph. In FIG. 3, the gas chromatograph oven is shown in a cross-sectional view at the middle height, and in FIG. 4, it is shown in a cross-sectional view at the upper height.
The gas chromatograph includes a gas chromatograph oven 2 and a control unit 40 that controls the gas chromatograph oven 2.
The gas chromatograph oven 2 includes a cubic housing 10 surrounded by four walls 12 on the top, bottom, left and right, a back wall 16 and a front door 15 serving as a front wall. Inside the housing 10 is a sample. A column 11 through which gas passes, a radial fan 14 that circulates air, a heater 13 that heats air, and a temperature sensor 18 that detects an internal temperature T are housed. A motor 17 connected to the fan 14 via a rotating shaft is provided.

The front door 15 is formed to be openable and closable with the left end as an axis. When the operator opens the front door 15, the column 11 accommodated in the housing 10 can be exchanged with another column. It can be done.
Further, an exhaust port 32 is provided in the upper portion of the back wall 16, and an exhaust door 36 is formed in the exhaust port 32 so as to be openable and closable. As a result, when the exhaust door 36 is opened by the control unit 40, the internal air can be discharged to the outside from the exhaust port 32. On the other hand, an intake port 33 is provided in the middle of the back wall 16, and an intake door 37 is formed in the intake port 33 so as to be openable and closable. As a result, when the intake door 37 is opened by the control unit 40, external air can be introduced into the inside through the intake port 33.

In such a gas chromatograph oven 2, the control unit 40 heats the air by supplying energized power to the heater 13, and the heated air is circulated by rotating the radial fan 14 with the motor 17. The inside of the housing 10 can be set to a uniform target temperature (for example, any temperature up to 450 ° C.) T ′.
At this time, when the temperature T detected by the temperature sensor 18 is lower than the target temperature T ′, the control unit 40 closes the exhaust door 36 and the intake door 37 and raises the energization power to the heater 13. The air is heated to 10 ° C./min.
When the temperature T detected by the temperature sensor 18 becomes higher than the target temperature T ′, the electric power supplied to the heater 13 is reduced and the exhaust door 36 and the intake door 37 are opened, so that the external room temperature can be reduced. Air is introduced from the air inlet 33 and part of the heated air is discharged from the air outlet 32 to the outside.
When the measurement is completed, the exhaust door 36 and the intake door 37 are opened, and the energized power to the heater 13 is stopped, so that external room temperature air is introduced from the intake port 33 and heated. Part of the air is exhausted from the exhaust port 32 to the outside. Thereby, the inside of the housing 10 is gradually cooled to room temperature.
Japanese Patent Laid-Open No. 9-68520

However, in the gas chromatograph oven 2 as described above, when the operator replaces the column 11 accommodated in the housing 10 with another column, the operation of the interior of the housing 10 is performed at room temperature because the operation is performed rapidly. The front door 15 may be opened when it is not fully lowered. At this time, the inside of the housing 10 may be at a high temperature, and the operator may be burned.
In addition, when a large amount of external air at room temperature is introduced inside, the column 11 is rapidly cooled, and the liquid phase structure of the column 11 may be deteriorated depending on the type of the column 11.
Therefore, an object of the present invention is to provide a gas chromatograph using a gas chromatograph oven that can prevent the operator from opening the door when the inside of the housing is hot.

  The gas chromatograph of the present invention made to solve the above problems includes a housing having an openable / closable door, a column disposed inside the housing, a heater for heating air inside the housing, A gas chromatograph provided with a gas chromatograph oven provided with a temperature sensor for detecting a temperature inside the housing, wherein the gas chromatograph oven comprises a lock mechanism that makes the door impossible to open, and the temperature When the temperature detected by the sensor is equal to or higher than a set temperature, a lock mechanism control unit that controls the lock mechanism is provided so that the door cannot be opened.

  According to the gas chromatograph of the present invention, it is provided with a lock mechanism that makes it impossible to open the door, and when the temperature detected by the temperature sensor is equal to or higher than the set temperature, the door cannot be opened. In addition, since the locking mechanism is controlled, it is possible to prevent the operator from opening the door.

(Means and effects for solving other problems)
In the above invention, the gas chromatograph oven has a fan that circulates air inside the housing and an exhaust door that can be opened and closed, and the exhaust door is opened to open the exterior of the housing. The temperature detected by the temperature sensor is provided with an exhaust port for exhausting air, an intake door that can be opened and closed, and an intake port that introduces air into the housing when the intake door is opened. Based on the above, a temperature control unit for controlling the exhaust door and / or the intake door may be provided so as to open and close the exhaust door and / or the intake door.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and it goes without saying that various aspects are included without departing from the spirit of the present invention.

FIG.1 and FIG.2 is a schematic block diagram of an example of the gas chromatograph of embodiment of this invention. In FIG. 1 and FIG. 2, the gas chromatograph oven is shown in a horizontal cross-sectional view at the center. Moreover, the same code | symbol is attached | subjected about the thing similar to the oven 2 for gas chromatographs. In the gas chromatograph oven 1, unlike the gas chromatograph oven 2, a lock mechanism 19 that prevents the front door 15 from being opened is formed, and the control unit 20 controls the lock mechanism 19. It has the control part 21b.
The gas chromatograph includes a gas chromatograph oven 1 and a control unit 20 that controls the gas chromatograph oven 1.

  The oven for gas chromatography 1 includes a cubic-shaped housing 10 surrounded by four walls 12 on the top, bottom, left and right, a back wall 16, and a front door 15 serving as a front wall. Inside the housing 10 is a sample. A column 11 through which gas passes, a radial fan 14 that circulates air, a heater 13 that heats air, a temperature sensor 18 that detects an internal temperature T, and a lock that makes it impossible for the front door 15 to be opened. The mechanism 19 is accommodated, and a motor 17 connected to the radial fan 14 via a rotating shaft is provided outside the housing 10.

At the right end of the inner surface of the front door 15, a convex portion 15a that protrudes perpendicularly from the inner surface is provided, and the convex portion 15a has an opening 15b that penetrates in the lateral direction. A bar portion 19a of a lock mechanism 19 described later can be inserted into the opening 15b.
The lock mechanism 19 is attached to the inner surface of the right wall 12, and is formed so that the rod portion 19a can enter and exit from the cylindrical portion 19b in the lateral direction.
Thus, when the bar portion 19a of the lock mechanism 19 is inserted into the opening 15b of the convex portion 15a, the front door 15 cannot be opened. The movement of the rod part 19a in and out of the cylinder part 19b is controlled by a drive signal from the lock mechanism control part 21b.

The control unit 20 includes a CPU 21 and a memory 22, and functions to be processed by the CPU 21 are described as a block. A temperature control unit 21 a that controls the heater 13, the exhaust door 36 and the intake door 37, and a lock that controls the lock mechanism 19. And a mechanism control unit 21b. Further, the memory 22 has a set temperature storage area 22a for storing a set temperature T _th (for example, 50 °).

The temperature control unit 21 a controls the heater 13, the exhaust door 36, and the intake door 37 based on the temperature T detected by the temperature sensor 18.
Specifically, when the temperature T detected by the temperature sensor 18 is lower than the target temperature T ′, the exhaust door 36 and the intake door 37 are closed, and the energization power to the heater 13 is increased, thereby increasing 10 ° C. / Air is heated so that it becomes min.
When the temperature T detected by the temperature sensor 18 becomes higher than the target temperature T ′, the electric power supplied to the heater 13 is reduced and the exhaust door 36 and the intake door 37 are opened, so that the external room temperature can be reduced. Air is introduced from the air inlet 33 and part of the heated air is discharged from the air outlet 32 to the outside.
When the measurement is completed, the exhaust door 36 and the intake door 37 are opened, and the energized power to the heater 13 is stopped, so that external room temperature air is introduced from the intake port 33 and heated. Part of the air is discharged from the exhaust port 32 to the outside. Thereby, the inside of the housing 10 is gradually cooled to room temperature.

The lock mechanism control unit 21 b controls the lock mechanism 19 based on the temperature T detected by the temperature sensor 18.
Specifically, when the temperature T detected by the temperature sensor 18 is equal to or higher than the set temperature _Tth , the front door 15 is locked by the opening 15b of the convex portion 15a so that the operator cannot open the front door 15. The rod portion 19a of the mechanism 19 is inserted. On the other hand, when the temperature T detected by the temperature sensor 18 is lower than the set temperature _Tth , the rod portion 19a of the lock mechanism 19 is not inserted into the opening 15b of the convex portion 15a. That is, the operator can open the front door 15.

Next, a control method for controlling the lock mechanism 19 in the gas chromatograph of the embodiment of the present invention will be described. FIG. 5 is a flowchart for explaining the control method.
First, in the process of step S101, the lock mechanism control unit 21b acquires the temperature T detected by the temperature sensor 18.
Next, in the process of step S102, the lock mechanism control unit 21b determines whether or not the temperature T is _{equal to} or higher than the set temperature _Tth . When the temperature T is _lower than the set temperature _Tth , the process returns to step S101.

On the other hand, when the temperature T is _{equal to} or higher than the set temperature _Tth , in the process of step S103, the lock mechanism control unit 21b inserts the bar portion 19a of the lock mechanism 19 into the opening 15b of the convex portion 15a.
Next, in the process of step S <b> 104, the lock mechanism control unit 21 b acquires the temperature T detected by the temperature sensor 18.
Next, in the process of step S105, the lock mechanism control unit 21b determines whether or not the temperature T is _{equal to} or higher than the set temperature _Tth . When the temperature T is _{equal to} or higher than the set temperature _Tth , the process returns to step S104.

On the other hand, when the temperature T is lower than the set temperature _Tth , in the process of step S106, the lock mechanism control unit 21b pulls out the bar portion 19a of the lock mechanism 19 from the opening 15b of the convex portion 15a.
Next, in the process of step S107, it is determined whether or not to end the measurement. If it is determined not to end the measurement, the process returns to step S101.
On the other hand, when it is determined that the measurement is finished, this flowchart is finished.

As described above, according to the gas chromatograph, the front door 15 is provided with the lock mechanism 19 that cannot be opened, and when the temperature T detected by the temperature sensor 18 is _{equal to} or higher than the set temperature _Tth , the front door is provided. Since the lock mechanism 19 is controlled so that the opening of the front door 15 is impossible, it is possible to prevent the front door 15 from being opened by the operator.

  The present invention can be used for a gas chromatograph for adjusting the temperature of a column.

It is a schematic block diagram of an example of the gas chromatograph of embodiment of this invention. It is a schematic block diagram of an example of the gas chromatograph of embodiment of this invention. It is a schematic block diagram of an example of the conventional gas chromatograph. It is a schematic block diagram of an example of the conventional gas chromatograph. It is a flowchart for demonstrating a control method.

Explanation of symbols

1, 2 Gas chromatograph oven 10 Housing 11 Column 13 Heater 15 Front door 18 Temperature sensor 19 Lock mechanism 20 Control unit 22 Memory

Claims (2)

Housing with a door that can be opened and closed;
A column disposed inside the housing;
A heater for heating air inside the housing;
A gas chromatograph comprising a gas chromatograph oven comprising a temperature sensor for detecting the temperature inside the housing;
The gas chromatograph oven includes a lock mechanism that makes it impossible to open the door,
A gas chromatograph comprising a lock mechanism control unit that controls the lock mechanism so that the door cannot be opened when a temperature detected by the temperature sensor is equal to or higher than a set temperature. The gas chromatograph oven has a fan that circulates air inside the housing,
An exhaust port that is openable and closable, and an exhaust port that discharges air to the outside of the housing by opening the exhaust door;
It has an intake door that can be opened and closed, and is provided with an intake port for introducing air into the housing by opening the intake door.
2. A temperature control unit that controls the exhaust door and / or the intake door so as to open and close the exhaust door and / or the intake door based on the temperature detected by the temperature sensor. The gas chromatograph described in 1.

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