JPH0783896A - Oven for gas chromatograph - Google Patents

Abstract

PURPOSE:To provide an exhaust passage for temperature adjustment, while making an external shape compact. CONSTITUTION:An opening 30 on the inner side of the rear wall 16 of an intake passage is positioned inside the rotation locus of the blade end of a fan 14, while an opening on the external side of the wall 16 is off a fan drive shaft mounting position. Also, a duct communicating both openings with each other is laid inside the rear wall 16. An exhaust passage is made open to the internal side of the wall 16 outside the rotation locus of the blade end of the fan 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention mainly accommodates a column of a gas chromatograph and performs temperature control in order to perform the gas chromatograph under a constant temperature or a temperature condition which is changed by a predetermined program. The present invention relates to a gas chromatograph oven.

[0002]

2. Description of the Related Art As an example of a conventional gas chromatograph oven, the one described in US Pat. No. 4,181,613 will be described with reference to FIG. The oven 40 has a heater 4 inside an outer box 42 that is large enough to accommodate the column 41.
3 and a fan 44 are provided. A door 45 for loading the column 41 is provided on the front surface of the outer box 42, and a fan motor 47 is provided outside the rear wall 46 facing the door 45.
Is fixed. Inside the rear wall 46, an internal partition 50 is provided at a position slightly away from the rear wall 46. As shown in FIG. 4B, the inner partition wall 50 has the same size as the rear wall 46 (that is, the inner portion of the cross section of the outer box 42), and has a space for venting inside the oven 40 (the rear wall 46).
And a partial space 51 sandwiched between the inner partition wall 50 and the inner partition wall 50 is secured.

The fan 44 is provided closer to the door 45 than the internal partition 50 (thus, the shaft 52 of the fan motor 47 penetrates through the rear wall 46 and the internal partition 50), and the heater 43 is located in front of the fan 44 (door 45 side). ) Is provided. Heater 43
A protective cover 53 is provided on the front surface of the. The portion of the internal partition wall 50 just behind the fan 44 (the fan motor 47
(A portion centered on the shaft 52) is provided with a hole 54 slightly smaller than the diameter of the fan 44.

As shown in FIG. 4B, an intake port 55 is provided at the upper side of the rear wall 46, an exhaust port 56 is provided at the corner, and lids 57 and 58 are provided, respectively. The openings of these lids 57 and 58 are adjusted by a motor 60.

When the column 41 is heated by the oven 40, the heater 43 is energized and the fan 44 is rotated to supply high temperature air to the column 41 from the periphery. At this time, the temperature inside the oven 40 is controlled by controlling the opening amount of the lids 57 and 58 of the intake port 55 and the exhaust port 56 together with the energization amount of the heater 43. On the other hand, when the first heating or thermal history gas chromatograph is ended and the gas chromatograph is performed at a lower temperature than that for the second time, it is necessary to cool the inside of the oven 40. At this time, the lid 5 of the intake port 55 and the exhaust port 56
7, 58 are fully opened and the fan 44 is rotated.

In these cases, the air taken in through the intake port 55 provided on the upper side of the rear wall 46 is used in the oven 40.
First enter the internal ventilation space 51, and then the internal partition wall 5
The fan 44 is reached through a hole 54 provided around the zero fan motor shaft 52. The air inside the oven 40 is discharged through the exhaust port 56 provided at the corner of the rear wall 46.
Emitted from.

[0007]

SUMMARY OF THE INVENTION The conventional oven 4 described above.
At 0, since it is necessary to provide the ventilation space 51 inside the outer box 42, the space that can accommodate the column 41 becomes narrow.
On the other hand, if a space for accommodating the column 41 is secured, the outer case 42 has to be made larger, the heat capacity becomes larger, and the response at the time of heating / cooling deteriorates.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an oven for a gas chromatograph which has a compact outer shape and which has an intake / exhaust passage for temperature control. To provide.

[0009]

A gas chromatograph oven according to the present invention, which has been made to solve the above-mentioned problems, performs gas chromatography at a predetermined temperature.
A gas chromatograph oven that accommodates a gas chromatograph column therein and heats the column with a heater and a fan, wherein the fan is inside one wall, a motor that drives the fan to a corresponding position outside, and
It has a fan drive shaft that penetrates through the wall and connects the two, and opens on the inner surface side of the wall inside the rotational trajectory of the blade tip of the fan, and through a duct provided inside the wall. It is characterized in that it is provided with an intake passage opening at a position outside the fan drive shaft mounting position on the outer surface side of the wall, and an exhaust passage opening on the inner surface side of the wall outside the rotation locus of the blade tip of the fan. .

[0010]

When the fan is rotated, the pressure inside the rotation locus of the tip of the fan becomes lower than atmospheric pressure, and the pressure outside becomes higher than atmospheric pressure. Therefore, the air outside the oven is sucked toward the fan through the intake path from the opening provided inside the rotation trajectory of the fan tip, and the air inside the oven is provided outside the rotation trajectory of the fan tip. It is discharged to the outside through the opening of the exhaust path.

Since an intake passage for taking in air from the outside to the inside of the oven is provided inside the wall, a ventilation space is provided inside the oven as in the conventional case (see FIG. 4).
It is not necessary to provide 51) of (a), and the inside of the oven can be widely used. Therefore, when the heating space of the same size is secured, the entire size can be reduced, which is convenient for installation, the heat capacity is reduced, and the heating / cooling response is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas chromatograph oven according to an embodiment of the present invention will be described with reference to FIGS. The oven 10 of this embodiment includes an outer box 12 having a size capable of accommodating a column 11 (FIG. 3), a heater 13 and a fan 14 provided inside the outer box 12. A door 15 for loading the column 11 is provided on the front surface of the outer case 12, and a fan motor 17 is fixed to the outside of a rear wall 16 facing the door 15. However, unlike the conventional oven (FIG. 4), the oven 10 of the present embodiment does not have an internal partition wall inside the outer box 12, and the fan 14 is placed just inside the rear wall 16. Also, as shown in FIG.
Is arranged on the outer peripheral side of the
4 is arranged in the vicinity. As a result, in the oven 10 of the present embodiment, the total length in depth can be made smaller than that of the conventional oven (FIG. 4) when a space of the same size is secured inside. The blade shape of the fan 14 is set so as to blow air forward and in the radial direction.

Both the outer case 12 and the door 15 are formed by a thick wall in which a heat insulating material is sandwiched between a front plate and a back plate made of steel (stainless steel), and the side surface of the outer case 12 (the door 15 and the rear wall 16). No openings are provided on the front and back sides of the wall that connects the four surfaces). On the other hand, the rear wall 16 of the outer box 12
Is configured as follows. First, as shown in FIG. 3 (b), the back plate (plate inside the oven) 161 has the fan 14 centered on the shaft 22 of the fan motor 17 at the center.
An internal opening 30 for intake (see FIG. 2) is provided inside the rotation locus of the tip of the, and an internal opening 31 for exhaust (see FIGS. 2 and 3 (a)) is provided at one corner. Has been. The front plate (plate outside the oven) 162 of the rear wall 16 has an exhaust external opening 32 (FIGS. 2 and 3A) at the same position as the exhaust opening 31 and an exhaust external opening 32. The intake external opening 33 (FIG. 3 (b)) is provided immediately below. Since the exhaust internal opening 31 and the external opening 32 are at the same position, they are connected in a straight line, and a heat insulating material 163 is provided around them. However, since the external opening 33 for intake and the internal opening 30 have different positions inside and outside, both 33 and 30 are communicated with each other through a communication passage (duct) 34 provided inside the rear wall 16. Therefore, in the rear wall 16, the heat insulating material 163 is filled in the portion excluding the exhaust inner and outer openings 31, 32 and the communication passage (duct) 34.
The exhaust external opening 32 and the intake external opening 33 are provided with lids 36 and 37, respectively.
The opening can be adjusted by (Fig. 2). The lids 36 and 37 may be integrated.

When the column 11 is heated by the oven 10, the heater 13 is energized and the fan 14 is rotated to supply high temperature air to the column 11 from the periphery. At this time, the temperature inside the oven 10 is controlled by controlling the opening amount of the lids 36 and 37 of the intake passage and the exhaust passage together with the energization amount of the heater 13.

On the other hand, when the first heating or thermal history gas chromatograph is finished and the second gas chromatograph is performed at a lower temperature than that, it is necessary to cool the inside of the oven 10. At this time, the lids 36 and 37 of the intake passage and the exhaust passage are fully opened and the fan 14 is rotated. Since the blade shape of the fan 14 is set as described above, the air pressure in the rear center part of the fan 14 (inward of the rotation locus of the tip of the fan 14) decreases, and the peripheral part (fan 1
The pressure on the outside of the locus of the tip of 4 becomes higher. As a result, the outside low-temperature air is supplied to the intake passages 33, 3 on the center side
The high temperature air sucked in from the exhaust passages 4 and 30 is exhausted from the exhaust passages 31 and 32 on the peripheral side.

[0016]

In the gas chromatograph oven according to the present invention, since the intake passage for taking in air from the outside into the oven is provided in the rear wall, a space for ventilation is provided inside the oven as in the conventional case. The inside of the oven can be widely used without the need to provide. Therefore, when the heating space of the same size is secured, the entire size can be reduced, which is convenient for installation, the heat capacity is reduced, and the heating / cooling response is improved.

[Brief description of drawings]

FIG. 1 is a perspective view including a partial perspective view of a gas chromatograph oven according to an embodiment of the present invention.

FIG. 2 is a rear view of the oven according to the embodiment.

FIG. 3 is an upper sectional view (a) and a lower sectional view (b) of the oven according to the embodiment.

FIG. 4 is an upper sectional view (a) and a rear view (b) of a conventional gas chromatograph oven.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Oven 12 ... Outer box 13 ... Heater 14 ... Fan 16 ... Rear wall 161 ... Back plate 162 ... Front plate 163 ... Insulation material 17 ... Fan motor 22 ... Fan motor shaft 30 ... Intake passage internal opening 33 ... Intake passage External opening 34 ... Communication path (duct) of intake path 31 ... Internal opening of exhaust path 32 ... External opening of exhaust path 36, 37 ... Lid 38 ... Lid opening / closing motor

Claims (1)

[Claims] 1. An oven for a gas chromatograph in which a gas chromatograph column is housed therein and a column is heated by a heater and a fan in order to perform the gas chromatograph at a predetermined temperature, wherein the fan is provided inside one wall. , A motor for driving the fan at a corresponding position on the outside, and a fan drive shaft penetrating the wall to connect the two, and on the inner surface side of the wall, inside the rotation trajectory of the blade tip of the fan. An intake passage that is open and opens at a position outside the fan drive shaft mounting position on the outer surface side of the wall through a duct provided inside the wall, and the rotation of the blade tip of the fan on the inner surface side of the wall An oven for a gas chromatograph, characterized by comprising an exhaust passage opening outside the locus.