JPS6182648A - Mass spectrometer - Google Patents

Abstract

PURPOSE:To simplify a structure of the captioned spectrometer by forming holder parts for at least two sample introduction parts of different set temperatures as an integral structure comprising thermal conductors joined with each other through their prescribed cross sections, and providing heating and thermally insulating means on the side of the holder parts to be kept at high temperature. CONSTITUTION:A glass tube 2 of a standard sample introducing system in a mass spectrometer and a glass tube 6 of sample introducing system from a gas chromatography apparatus are respectively held by holder parts 4, 8 each comprising thermally conductive metal joined via a joint part 10 having a prescribed cross sectional area, while a heater 18 is burried in one 8 of the holder parts. These tubes 2, 6 are mounted on a vacuum chamber 14 with the help of a flange 12, and connected with a sample outside the vaccum chamber while connected with an ionizing chamber of an ion source inside the vacuum chamber. Hereby, the sample from the gas chromatography apparatus can be kept at about 300 deg.C and a standard smaple kept at prescribed temperature of 200 deg.C different from the former case by making use of the cross sectional portion of the joint part 10, and hereby the mass spectrometer can be simplified in its structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention applies to gas chromatograph mass spectrometers (GC-
M S ).

(Prior art) A gas chromatograph mass spectrometer directly connects a gas chromatograph and a mass spectrometer, but in order to accommodate a wide range of applications, the mass spectrometer is equipped with at least three sample introduction sections. It is being These sample introduction sections are 1, for example, a standard sample introduction system, a backed column introduction system that is introduced from the back column of the gas chromatograph via a separator or a splinter, and a capillary column introduction system that is introduced from the capillary column of the gas chromatograph. Department.

These sample introduction sections need to be heated to prevent sample components from adhering to their inner wall surfaces. In a sample introduction system from a gas chromatograph such as a backed column introduction system or a capillary column introduction system, the sample introduction part needs to be heated to a maximum of about 300°C, whereas in a standard sample introduction system, the sample introduction part must be heated. The required heating temperature differs depending on the sample introduction system, such as that about 200°C is sufficient.

Therefore, conventionally, in the sample introduction section from outside the vacuum chamber to the vacuum chamber, heaters and W
A heating and heat-retaining means consisting of a temperature control device is installed.

(9!Problems that Ming attempts to solve) Currently, in a mass spectrometer equipped with one standard sample introduction system and one sample introduction system from a gas chromatograph,
Two sets of heaters and temperature controllers are required, and as the number of sample introduction systems increases, the number of sets of heaters and temperature controllers required also increases. As a result, it is inevitable that the structure of the sample introduction section becomes complicated and the cost increases.

An object of the present invention is to simplify the sample introduction section by simplifying the heating and warming means for the sample introduction section of a plurality of sample introduction systems set at different temperatures.

(Means for Solving the Problems) The mass spectrometer of the present invention has an integral structure of a thermal conductor in which the holding parts of at least two sample introduction parts with different set temperatures are joined with a predetermined cross-sectional area, and It is equipped with a sample introduction system that has a heating and heat-insulating means on the side of the cleavage holding section to maintain the product temperature.

(Function) One set of heating storage 1 for multiple integrated sample introduction systems
A fnj stage is provided. Between the holding parts of these sample introduction systems, heat flows through a joint with a predetermined cross-sectional area, or an 81λ degree gradient occurs depending on the cross-sectional area of the joint.
Each holding part reaches a predetermined temperature.

(Example) Figure 1 is a front view of the sample introduction part from outside the vacuum chamber into the vacuum chamber in one example, as seen from outside the vacuum chamber, and Figure 2 is a cross-sectional view taken along line A-B in Figure 1, showing a part of the vacuum chamber. This is shown together with

Reference numeral 2 denotes a glass tube for a standard sample introduction system, which is held by a holding part 4. Reference numeral 6 denotes a glass tube of a sample introduction system for guiding outflow gas from a column of a gas chromatograph, and is held by a holding section 8 .

Both the holding part 4 and the holding part 8 are formed of a metal with good thermal conductivity, and both the holding parts 4 and 8 are connected to a joint part 10 having a predetermined cross-sectional area.
They are joined together and constructed as a single piece. A single vacuum flange 12 is attached to both the integrated holding parts 4 and 8.
is provided and attached to the vacuum chamber 14 of the mass spectrometer.

A heater 16 is embedded in the holding section 8 of the sample introduction system from the gas chromatograph, and this heater 16 is controlled by a temperature control device (not shown) to maintain the holding section 8 and the holding section 4 at a predetermined temperature. It looks like this.

The outside of the vacuum chamber of the glass tube 2 (right side in FIG. 2) is connected to a standard sample container, and the outside of the vacuum chamber of the glass tube 6 is connected to a column of a gas chromatograph via a separator or splitter or directly.

Further, the vacuum chamber sides (left side in FIG. 2) of the glass tubes 2 and 6 are connected to the ionization chamber (not shown) of the ion source through connectors (not shown), respectively.

In this embodiment, by energizing the heater 16, the holding portion 8
is heated, and the holding part 4 is also heated through the joint 10, but since the joint 10 is designed to have a predetermined cross-sectional area, the amount of heat flowing is limited, and the temperature between the holding part 8 and the holding part 4 is A gradient occurs. Depending on the temperature gradient, the amount of electricity supplied to the heater 16 is controlled by the temperature control device so that the holding portion 8 is at a predetermined temperature and the holding portion 4 is at a lower predetermined temperature.

As a result, for example, the glass tube 6 for introducing a sample from a gas chromatograph is kept at about 300'C, and the glass tube 2 for the standard sample introduction system is kept at about 200°C.

The example describes two sample introduction systems, but three
The holding parts of more than one sample introduction system can be integrated in the same way, and the temperature of each can be maintained at a predetermined temperature.

(Effects of the Invention) According to the present invention, only one set of heater and temperature control device is required for a plurality of integrated sample introduction systems, which simplifies the structure and reduces costs.

In addition, it is integrated l1ff! 1. This also makes maintenance work easier.

[Brief explanation of drawings]

FIG. 1 is a front view showing a sample introduction section in one embodiment, and FIG. 2 is a cross-sectional view taken along the line AB in FIG. 1 together with a part of the vacuum chamber. 2.6...Glass tube for sample introduction system, 4.8...
...Holding part, 10...Joint part, [4...
・Vacuum chamber, 16...Heater.

Claims (1)

[Claims] (1) In a mass spectrometer that includes multiple sample introduction systems that introduce samples into the ion source from outside the vacuum chamber, a thermal conduction system in which the holding parts of at least two sample introduction systems with different set temperatures are joined with a predetermined cross-sectional area. A mass spectrometer characterized by having an integral body structure and having a heating and insulating means on the side of the holding part that is to be kept at a relatively high temperature.