JP2012078292A - Gas chromatograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas chromatograph capable of properly cooling a housing, and being downsized.SOLUTION: A gas chromatograph 1 comprises a housing 20; an oven 10; a column 31 and a first blade 32 which are disposed in the oven 10; a second blade 33, a first motor 40, and a second motor 41 which are disposed in a container wall and at a position outside the oven 10; a first shaft 34; and a second shaft 35. In order to make air pass through so as to circulate in a predetermined direction between the container wall and the oven 10, front side surface opening portions 21a and 22a are formed on a front portion of a right side surface wall 22 and a front portion of a left side surface wall 21, and a rear side back surface opening portion 23a is formed on a back surface wall 23. The second blade 33 is disposed before the rear side back surface opening portion 23a. A front side bottom surface opening portion 26b is formed at a front portion of a bottom surface wall 26.

Description

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

  In a gas chromatograph, a sample gas 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, the column is accommodated in the oven, and the temperature T inside the oven (for example, any temperature up to 450 ° C.) T can be adjusted. The gas chromatograph which can be used is used (for example, refer patent document 1).

FIG. 4 is a transverse sectional view showing an example of a conventional gas chromatograph, and FIG. 5 is a longitudinal sectional view showing an example of a conventional gas chromatograph. 6a is a left side view of the gas chromatograph shown in FIGS. 4 and 5, FIG. 6b is a right side view of the gas chromatograph shown in FIGS. 4 and 5, and FIG. 6c is a diagram of FIGS. 5d is a rear view of the gas chromatograph shown in FIG. 5, and FIG. 6d is a bottom view of the gas chromatograph shown in FIGS.
The gas chromatograph 101 includes a housing 20 having a vessel wall, an oven 10 disposed inside the housing 20, a column 31 through which sample gas passes, a first honey 32 disposed inside the oven 10, The first motor 40, the first shaft 34 connecting the first honey 32 and the first motor 40, the second honey 33 disposed outside the oven 10, the second motor 41, and the second honey 33 A second shaft 35 that connects the second motor 41 is provided.

The oven 10 includes a cubic housing surrounded by four upper, lower, left, and right heat insulating walls 11, a heat insulating rear wall 12, and a front door 13 serving as a heat insulating front wall. A heater 14 for heating the air inside the oven 10 is housed inside. Further, a column 31 and a first honey 32 are accommodated in the oven 10.
A cylindrical through hole 12 a is formed in the back wall 12, and the first shaft 34 penetrates the through hole 12 a, so that the first honey 32 inside the oven 10 and the outside of the oven 10 One motor 40 is connected.

The first motor 40 includes a cylindrical frame 40a, a stator 40b fixed to the inner peripheral surface of the frame 40a, a rotor 40c fixed to the outer peripheral surface of the other end of the first shaft 34, and the first shaft 34. Has two bearings 40d for supporting the other end of the first shaft 34 so as to be rotatable with respect to the frame 40a. Lubricating oil is used for the bearing 40d in order to rotate the first shaft 34 smoothly.
The first shaft 34 is formed of a metal (for example, iron) having a predetermined heat resistance and a predetermined strength, and has a cylindrical shape having a diameter of 10 mm, a length of 235 mm, and the like. One end portion of the first shaft 34 is fixed to the central portion of the first honey 32. The other end of the first shaft 34 is supported so as to be rotatable with respect to the first motor 40 about a cylindrical central axis as a rotation axis.

The second motor 41 includes a cylindrical frame 41a, a stator 41b fixed to the inner peripheral surface of the frame 41a, a rotor 41c fixed to the outer peripheral surface of the other end of the second shaft 35, and the second shaft 35. Has two bearings 41d that support the other end of the second shaft 35 so as to be rotatable with respect to the frame 41a. Lubricating oil is used for the bearing 41d in order to rotate the second shaft 35 smoothly.
The second shaft 35 is formed of a metal (for example, iron) having a predetermined heat resistance and a predetermined strength, and has, for example, a cylindrical shape having a diameter of 10 mm and a length of 235 mm. One end portion of the second shaft 35 is fixed to the central portion of the second honey 33. The other end of the second shaft 35 is supported by the second motor 41 so as to be rotatable about a columnar central axis as a rotation axis. In addition, the 2nd motor 41 is arrange | positioned ahead and the 2nd spring 33 is arrange | positioned back.

The housing 20 has a rectangular parallelepiped shaped wall surrounded by a top wall 25, a bottom wall 126, a left side wall 21, a right side wall 22, a back wall 123, and a front wall 24, and four leg portions. 126a. Inside the housing 20, the oven 10 is accommodated with a predetermined distance (space) from the instrument wall.
A front opening 21a of a plurality of elongated holes is formed in the front lower portion and the middle lower portion of the left side wall 21, and a plurality of elongated holes are formed in the front middle portion and the front lower portion of the right side wall 22. The front opening 22a is formed.
A circular rear opening 123a having a diameter L3 (for example, 100 to 130 mm) is formed at the center of the back wall 123. The 2nd honey 33 is arrange | positioned in the position of 5-10 mm ahead of the rear side opening part 123a. In addition, in the surface perpendicular to the rotation axis, the area of the rear opening 123a is 1.1 times the rotation area of the second honeycomb 33 (circular shape with a diameter L1).
Cylindrical leg portions 126 a are provided at the four corners of the bottom wall 126.

  In such a gas chromatograph 101, the energizing power is supplied to the heater 14 to heat the air inside the oven 10, and the energizing power is supplied to the first motor 40 through the first shaft 34. By circulating the heated air by rotating the honey 32, the inside of the oven 10 is brought to a uniform target temperature T. Moreover, by supplying the energizing power to the second motor 41 and rotating the second spring 33 via the second shaft 35, air is introduced between the instrument wall and the oven 10 through the front openings 21 a and 22 a. The air is circulated from the front to the rear (predetermined direction) between the container wall and the oven 10, and then the air is discharged from the rear opening 123a, whereby the housing 20, the first motor 40, and the second The motor 41 is cooled with air.

Japanese Patent Laid-Open No. 9-68520

However, in the gas chromatograph 101 as described above, the housing 20 needs to be set to 70 ° C. or less for safety. Further, when the first motor 40 or the second motor 41 becomes a high temperature of 100 ° C. or higher, the electric conductor (not shown) or the like deteriorates, or the bearings 40d and 41d of the first motor 40 and the second motor 41 are lubricated. Since oil or the like flows out, the casing 20, the first motor 40, and the second motor 41 are cooled by the air that has circulated between the container wall and the oven 10 in a predetermined direction. Yes.
However, since air is introduced between the front walls 21a and 22a between the vessel wall and the oven 10, the left wall 21 and the right wall 22 are cooled well, but the bottom wall 126 is not cooled much. Therefore, the distance M2 between the bottom wall 126 and the bottom surface of the oven 10 is increased. In addition, when the distance between the bottom wall 126 and the bottom surface of the oven 10 was shortened and the second honey 33 was rotated quickly to increase the flow velocity of the air flowing between the vessel wall and the oven 10, this time However, not only the housing 20 but also the housing of the oven 10 is cooled.
Then, an object of this invention is to provide the gas chromatograph which can cool a housing | casing appropriately and can be reduced in size.

  The gas chromatograph of the present invention, which has been made to solve the above problems, comprises a vessel wall composed of a top wall, a bottom wall, a right side wall, a left side wall, a front wall and a back wall, and legs provided on the bottom wall. An oven disposed in the interior of the instrument wall with a space from the instrument wall, a column and a first heater disposed in the oven, and the interior of the instrument wall. And the 2nd honey, the 1st motor, and the 2nd motor which are arranged in the position which is the outside of the oven, and it is a rod shape extended in a predetermined direction, the 1st honey is connected to one end, and the 1st motor A first shaft that rotates about a predetermined direction as a central axis, and a second shaft that has a rod shape that extends in a predetermined direction, has a second hook connected to one end, and rotates about the predetermined direction by the second motor. And comprising the vessel wall A front side opening is formed in the front part of the right side wall and the front part of the left side wall so that air can flow in a predetermined direction between the front wall and the back wall. A rear back opening is formed, and the second splash is a gas chromatograph arranged in front of the rear back opening, and a front bottom opening is formed at the front of the bottom wall. Have been like that.

Here, the “predetermined direction” is an arbitrary direction determined in advance for allowing air to pass between the housing and the oven by a designer or the like, for example, from the front to the rear.
According to the gas chromatograph of the present invention, air is introduced between the instrument wall and the housing through the front side opening and the front bottom opening by rotating the second heater, and a predetermined gap is provided between the instrument wall and the housing. The casing and the motor are cooled with air by circulating air in the direction and then discharging the air from the rear rear opening. That is, air is also introduced from the front bottom opening.

  As described above, according to the gas chromatograph of the present invention, the casing can be appropriately cooled and downsized.

It is a cross-sectional view which shows an example of the gas chromatograph of this invention. It is a longitudinal cross-sectional view which shows an example of the gas chromatograph of this invention. FIG. 3 is a left side view of the gas chromatograph shown in FIGS. 1 and 2. FIG. 3 is a right side view of the gas chromatograph shown in FIGS. 1 and 2. FIG. 3 is a rear view of the gas chromatograph shown in FIGS. 1 and 2. FIG. 3 is a bottom view of the gas chromatograph shown in FIGS. 1 and 2. It is a cross-sectional view showing an example of a conventional gas chromatograph. It is a longitudinal cross-sectional view which shows an example of the conventional gas chromatograph. FIG. 6 is a left side view of the gas chromatograph shown in FIGS. 4 and 5. It is a right view of the gas chromatograph shown in FIG.4 and FIG.5. It is a rear view of the gas chromatograph shown in FIG.4 and FIG.5. FIG. 6 is a bottom view of the gas chromatograph shown in FIGS. 4 and 5.

  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 is a transverse sectional view showing an example of the gas chromatograph of the present invention, and FIG. 2 is a longitudinal sectional view showing an example of the gas chromatograph of the present invention. 3a is a left side view of the gas chromatograph shown in FIGS. 1 and 2, FIG. 3b is a right side view of the gas chromatograph shown in FIGS. 1 and 2, and FIG. 3c is a diagram of FIGS. 2 is a rear view of the gas chromatograph shown in FIG. 2, and FIG. 3d is a bottom view of the gas chromatograph shown in FIGS. In addition, the same code | symbol is attached | subjected about the thing similar to the gas chromatograph 101 mentioned above.
The gas chromatograph 1 includes a housing 20 having a vessel wall, an oven 10 disposed inside the housing 20, a column 31 through which a sample gas passes, a first honey 32 disposed inside the oven 10, The first motor 40, the first shaft 34 connecting the first honey 32 and the first motor 40, the second honey 33 disposed outside the oven 10, the second motor 41, and the second honey 33 A second shaft 35 that connects the second motor 41 is provided.

The housing 20 has a rectangular parallelepiped shaped wall surrounded by a top wall 25, a bottom wall 26, a left wall 21, a right wall 22, a back wall 23, and a front wall 24, and four legs. 26a. Inside the housing 20, the oven 10 is accommodated with a predetermined distance (space) from the instrument wall.
A front opening 21a of a plurality of elongated holes is formed in the front lower portion and the middle lower portion of the left side wall 21, and a plurality of elongated holes are formed in the front middle portion and the front lower portion of the right side wall 22. The front opening 22a is formed.
In the center of the back wall 23, a square rear back opening 23a having a side L2 (for example, 110 mm) is formed. A second splash 33 is disposed at a position of 5 to 10 mm in front of the rear side rear opening 23a. In addition, in the surface perpendicular to the rotation axis, the area of the rear rear opening 23a is 1.5 times the rotation area of the second honey 33 (circular shape with a diameter L1).
Further, a duct 23b having a rectangular tube shape (for example, 110 mm on a side and 90 mm in height) is formed on the peripheral edge of the rear opening 23a. That is, the 2nd spring 33 and the 2nd motor 41 are arrange | positioned inside the duct 23b.
Cylindrical leg portions 26 a are provided at the four corners of the bottom wall 26. A front bottom opening 26 b of a plurality of elongated holes is formed at the front of the bottom wall 26. The distance M1 between the bottom wall 26 and the bottom surface of the oven 10 is shorter than the distance M2.

In such a gas chromatograph 1, the energizing power is supplied to the heater 14 to heat the air inside the oven 10, and the energizing power is supplied to the first motor 40 through the first shaft 34. By circulating the heated air by rotating the honey 32, the inside of the oven 10 is brought to a uniform target temperature T. Moreover, by supplying the energizing power to the second motor 41 and rotating the second spring 33 via the second shaft 35, air is supplied from the front openings 21a, 22a and the front bottom opening 26b to the instrument wall. By inserting between the oven 10 and circulating air from the front to the back (predetermined direction) between the vessel wall and the oven 10, and then discharging the air from the center of the rear back opening 23a, The housing 20, the first motor 40, and the second motor 41 are cooled with air.
Air is introduced from the peripheral edge (square corner) of the rear rear opening 23a, and air is circulated between the second motor 41 and the duct 23b in a direction opposite to a predetermined direction, and then the second motor. The second motor 41 is cooled with air by allowing air to flow between the duct 41b and the duct 23b in a predetermined direction and exhausting it from the center of the rear rear opening 23a. That is, the second motor 41 can be cooled with air that does not flow between the container wall and the oven 10.

  As described above, according to the gas chromatograph 1 of the present invention, the housing 20 can be appropriately cooled and downsized.

<Other embodiments>
(1) In the gas chromatograph 1 described above, the configuration in which the second splash 33 and the second motor 41 are arranged inside the duct 23b is shown, but the second splash and the second motor are arranged inside the duct. It is good also as a structure where the 1st motor is arrange | positioned.
(2) In the gas chromatograph 1 described above, a configuration is shown in which a square rear rear opening 23a is formed and a duct 23b is formed at the peripheral edge of the rear opening 23a. It is good also as a structure where the side back opening part is formed and the duct is not formed.

  The present invention can be used for a gas chromatograph in which a column is accommodated in an oven and the temperature of the column is adjusted.

DESCRIPTION OF SYMBOLS 1 Gas chromatograph 10 Oven 20 Housing | casing 21 Left side wall 22 Right side wall 21a, 22a Front side opening part 23 Back wall 23a Rear side rear opening part 23b Duct 24 Front wall 25 Top wall 26 Bottom wall 26a Leg part 26b Front bottom opening part 31 Column 32 First Honey 33 Second Honey 34 First Shaft 35 Second Shaft 40 First Motor 41 Second Motor

Claims (1)

A housing having a top wall, a bottom wall, a right side wall, a left side wall, a front wall and a back wall, and a leg provided on the bottom wall;
An oven disposed inside the vessel wall with a space from the vessel wall;
A column and a first heater disposed inside the oven;
A second honey, a first motor and a second motor arranged at a position inside the vessel wall and outside the oven;
A first shaft that has a rod-like shape extending in a predetermined direction, has a first hook connected to one end, and rotates about the predetermined direction as a central axis by the first motor;
A rod extending in a predetermined direction, with a second shaft connected to one end, and a second shaft that rotates about a predetermined direction as a central axis by the second motor;
A front side opening is formed in the front part of the right side wall and the front part of the left side wall in order to allow air to pass between the vessel wall and the oven in a predetermined direction, and The rear wall has a rear back opening,
The second honey is a gas chromatograph arranged in front of the rear back opening,
A gas chromatograph, wherein a front bottom opening is formed at a front portion of the bottom wall.

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