Gas chromatograph

Abstract

Provided is a gas chromatograph capable of properly cooling a motor and a casing. The gas chromatograph comprises a thermostat (10) which is configured inside a casing (20) in such a manner to be spaced from walls; a first shaft (34) which, with a rod shape extended along a predetermined direction, has one end portion connected with a first blade (32) and is rotated via a first electric motor (40) around a central shaft in the predetermined direction; and a second shaft (35) which, with a rod shape extended along the predetermined direction, has one end portion connected with a second blade (33) and is rotated via a second electric motor (41) around the central shaft in the predetermined direction. To allow air to flow between the casing (20) and the thermostat (10) along the predetermined direction, the front portion of the casing (20) is provided with front opening portions (21a, 22a), and the rear portion of the casing (20) is provided with a rear opening portion (23a). In a plane perpendicular to the predetermined direction, the area of the rear opening portion (23a) is larger than the rotation area of the second blade (33). A cylindrical pipe (23b) is formed and is extended along the predetermined direction from the edge portion of the rear opening portion (23a).

Description

technical field [0001] The invention relates to a gas chromatograph which houses a chromatographic column in a constant temperature box to adjust the temperature of the chromatographic column. Background technique [0002] In a gas chromatograph, the sample gas squeezes the carrier gas from the inlet end of the chromatographic column and is introduced into the chromatographic column. Thereby, various measurement substances contained in the sample gas are separated in the direction of the time axis while passing through the column, and then reach the outlet end of the column. At this time, in order to allow the sample gas to pass through the column at a predetermined temperature, a gas chromatograph (such as , refer to Patent Document 1). [0003] image 3 It is a sectional view showing an example of a conventional gas chromatograph. in addition, Figure 4 (a) is image 3 Left side view of the gas chromatograph shown, Figure 4 (b) is image 3 Right side view of the gas ...

AI Technical Summary

Problems solved by technology

However, since the air warmed by the heat of the outer shell of the thermostat 10 is used, the first motor 40 and the second motor 41 cannot be cooled efficiently.

In addition, although the second vane 33 is rotated at a high speed to increase the flow velocity of the air between the housing 20 and the thermostat 10, this will cause the problem that not only the housing 20 but also the outer shell of the thermostat 10 will be cooled.

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