JP3055190B2 - Gas chromatograph / mass spectrometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas chromatograph /
The present invention relates to a mass spectrometer, and more particularly to a technique for baking a vacuum housing of a mass spectrometer and radiating heat from a heating element of a power supply unit.

[0002]

2. Description of the Related Art A conventional gas chromatograph / mass spectrometer has a configuration shown in FIG. In FIG. 1, reference numeral 1 denotes a gas chromatograph for separating a sample gas into components;
Is a mass spectrometer for mass-separating ions of each component gas separated by the gas chromatograph 1, 4 is an interface connecting the gas chromatograph 1 and the mass spectrometer, 6 is PFT
A standard sample introduction unit for introducing a standard sample such as BA.

The above-mentioned mass spectrometer 2 comprises a vacuum housing 8
In the vacuum housing 8, an ion source 10 for ionizing a component gas, a mass separation unit 12 for mass separating ions of each component from the ion source 10, and mass separation by the mass separation unit 12 While a detector such as a secondary electron multiplier for detecting ions is disposed together, the ion source 10 and the mass separation unit 1 are provided outside the vacuum housing 8.
2. a power supply unit 16, which supplies power to the detector 14,
A heater 22 for baking the vacuum housing 8 is closely attached to an outer wall of the vacuum housing 8, and a dedicated power supply 24 is connected to the heater 22. .

The baking is performed by providing the heater 22 to the vacuum housing 8 for the following reason.

On the inner wall of the vacuum housing 8, a standard sample introduced for adjusting the measurement system before analysis, a solvent introduced from a gas chromatograph, or a residual sample gas is easily adsorbed. If present, it becomes a background during the analysis and deteriorates the detection sensitivity. Therefore, the vacuum housing 8 is always baked by the heater 22 to prevent adsorption of gas components. The baking temperature in this case is set to 1 in consideration of the heat resistance of the O-ring of the vacuum seal.
It is set to 00 ° C or lower.

On the other hand, each of the power supply sections 16, 18, and 20 has circuit elements 16a, 18a, and 20a such as power transistors, and heat is generated from these circuit elements 16a, 18a, and 20a. Circuit elements 16a, 18a, 20a
The radiators 16b, 18b, 20b are provided close to the radiator to dissipate heat.

[0007]

As described above, in the conventional apparatus, the heater 2 for baking the vacuum housing 8 is used.
2 and its power supply 24, and the power supply section 16 of the mass spectrometer 2,
Radiators 16b, 18b, and 20b for heat radiation of the circuit elements 16a, 18a, and 20a of 18, 20 are provided separately and independently, so that the number of parts of the entire apparatus increases and the cost increases. In addition, there is a problem that power consumption is large and the size of the apparatus cannot be reduced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is possible to perform baking of a vacuum housing without providing a special heater or a power source as in the prior art. It is intended to reduce the number of parts of the device, reduce unnecessary power consumption, and reduce the size of the device.

For this purpose, the present invention comprises a gas chromatograph for separating components of a sample gas and a mass spectrometer for mass separating ions of each component gas separated by the gas chromatograph. In the vacuum housing, an ion source for ionizing a component gas, a mass separation unit for mass-separating ions of each component gas from the ion source, and a detector for detecting ions separated by mass in the mass separation unit In the gas chromatograph / mass spectrometer, a power supply unit for supplying power to the ion source, the mass separation unit, and the detector is provided outside the vacuum housing. take.

That is, according to the present invention, the vacuum housing is formed of a material having thermal conductivity to such an extent that the vacuum housing can act as a radiator for heat dissipation, while a power supply section is formed on the outer wall of the vacuum housing. And a circuit element serving as a heat source is closely attached.

[0011]

In the above construction, the circuit elements constituting the power supply section act as a heat source for baking with respect to the vacuum housing.

On the other hand, for the above-mentioned circuit element, the vacuum housing acts as a radiator for heat radiation.

Therefore, the conventional heater and its power source are not required.

[0014]

FIG. 1 is a block diagram showing the overall configuration of a gas chromatograph / mass spectrometer according to an embodiment of the present invention, and portions corresponding to those of the conventional example shown in FIG.

In FIG. 1, 1 is a gas chromatograph,
2 is a mass spectrometer, 4 is an interface, 6 is a standard sample inlet, 8 is a vacuum housing, 10 is an ion source, 12 is a mass separator, 14 is a detector, and 16, 18, and 20 are power supplies. Is basically the same as that of the conventional example.

The feature of this embodiment is that the vacuum housing 8 is made of a material having heat conductivity such as an aluminum alloy or a copper alloy, which has such a degree that the vacuum housing 8 can function as a radiator for heat radiation. On the outer wall of the vacuum housing 8, circuit elements 16a, 18 such as power transistors, which constitute power sources 16, 18, 20 and serve as heat sources, are provided.
a, 20a are attached in close contact with each other, and each of the circuit elements 16a, 18a, 20a and the power supply sections 16, 18, 20
Are connected to each other by a cable 22.

In the above configuration, the circuit elements 16a, 18a, and 20a constituting the power supply sections 16, 18, and 20 function as heat sources for baking with respect to the vacuum housing 8.

On the other hand, the circuit elements 16a, 18a, 20
For a, the vacuum housing 8 acts as a radiator for heat dissipation.

Therefore, the conventional heater and its power source are not required.

[0020]

According to the present invention, the vacuum housing can be baked without providing a special heater or its power source as in the prior art, so that the number of parts of the apparatus is reduced, and the waste is reduced. Power consumption can be reduced, and the amount of heat generated from the device can be reduced. In addition, the present invention has excellent practical effects such as downsizing of the apparatus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a gas chromatograph / mass spectrometer according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the overall configuration of a conventional gas chromatograph / mass spectrometer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas chromatograph, 2 ... Mass spectrometer, 8 ... Vacuum housing, 10 ... Ion source, 12 ... Mass separation part, 14 ...
Detector, 16, 18, 20 ... power supply section, 16a, 18a, 2
0a: Circuit element.

Claims (1)

(57) [Claims] 1. A gas chromatograph (1) for separating components of a sample gas and a mass spectrometer (2) for separating mass of ions of each component gas separated by the gas chromatograph (1). The meter (2) has a vacuum housing (8), and in the vacuum housing (8), an ion source (10) for ionizing a component gas, and mass of ions of each component gas from the ion source (10). mass separation unit for separating (12), and the mass separation unit (12) in the mass separate detector for detecting ions (14) while the Gat also disposed, outside of the vacuum housing (8), A power supply unit (16) for supplying power to the ion source (10), the mass separation unit (12), and the detector (14),
In the gas chromatograph / mass spectrometer provided with (18) and (20), the vacuum housing (8) is made of a material having thermal conductivity to such an extent that the vacuum housing can act as a radiator for heat radiation. On the other hand, the power supply unit (1) is formed on the outer wall of the vacuum housing (8).
6) A gas chromatograph / mass spectrometer comprising the circuit elements (16a), (18a), and (20a) constituting (18) and (20) and serving as a heat source, which are closely attached.