Gas Chromatography Mass Analyzer

Abstract

A gas chromatography mass analysis device, characterized in that it comprises: a gas chromatography unit having a chromatographic column for separating components of a sample; a mass analysis unit disposed within a vacuum enclosure; an interface unit for introducing the sample whose components have been separated by the gas chromatography unit into the mass analysis unit, the interface unit comprising: a partition wall portion fixed to the vacuum enclosure so as to block an opening formed in the vacuum enclosure; a pipe system fixed to the partition wall portion so as to penetrate the partition wall portion inside and outside, enclosing a sample outlet side pipeline of the chromatographic column and introducing the sample into the mass analysis unit; a heating unit for heating the pipe system along the axial direction; and a fixing unit for fixing the heating unit in a state where the heating unit is in contact with the partition wall portion.

Description

Technical Field

[0001] The present invention relates to a gas chromatography mass analyzer. Background Art

[0002] A gas chromatography mass analyzer includes a gas chromatography unit, a mass analysis unit, and an interface unit (for example, refer to Patent Document 1). The interface unit connects the gas chromatography unit and the mass analysis unit. A sample that has been separated into components by the gas chromatography unit is introduced into the mass analysis unit via the interface unit. The mass analysis unit ionizes the sample after component separation and performs separation and detection based on "m / z". A heating block is provided in the interface unit to prevent the temperature of the chromatographic column passing through the interface unit from decreasing.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 10-283982 Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] However, there is a problem that the temperature distribution in the interface unit becomes uneven, causing the low-temperature part of the inner chromatographic column to adsorb the sample (especially high-boiling components), resulting in deterioration of the analysis accuracy.

[0008] Solution for Solving the Above Technical Problem

[0009] According to the first aspect of the present invention, a gas chromatography mass analyzer includes: a gas chromatography unit having a chromatographic column for separating components of a sample; a mass analysis unit provided in a vacuum housing; an interface unit for introducing the sample separated into components by the gas chromatography unit into the mass analysis unit, the interface unit including: a partition wall portion fixed to the vacuum housing so as to block an opening formed in the vacuum housing; a pipe system fixed to the partition wall portion so as to penetrate the partition wall portion inside and outside, and enclosing a sample outlet side pipeline of the chromatographic column to introduce the sample into the mass analysis unit; a heating unit for heating the pipe system in the axial direction; and a fixing unit for fixing the heating unit in a state where the heating unit is in contact with the partition wall portion.

[0010] According to the second aspect of the present invention, in the gas chromatography mass analyzer according to the first aspect, the fixing unit presses the heating unit against the partition wall portion.

[0011] According to the third aspect of the present invention, in the gas chromatography mass spectrometry apparatus of the second aspect, the heating unit is externally inserted into the pipe system, and the fixing unit is a nut member formed with an internal thread portion that engages with an external thread portion formed on the outer periphery of the pipe system. When the nut member is rotated and tightened relative to the pipe system, the heating unit is fixed in a manner of being pressed against the partition wall portion.

[0012] According to the fourth aspect of the present invention, in the gas chromatography mass spectrometry apparatus of the third aspect, a spring member is disposed between the nut member and the heating unit.

[0013] According to the fifth aspect of the present invention, in the gas chromatography mass spectrometry apparatus of the second aspect, the fixing unit is a fixing plate that is fixed to the partition wall portion and sandwiches the heating unit between the fixing plate and the partition wall portion.

[0014] According to the sixth aspect of the present invention, in the gas chromatography mass spectrometry apparatus according to any one of the first to fifth aspects, the pipe system is a rod-shaped member having: a first end portion fixed to the partition wall portion so as to penetrate the partition wall portion inside and outside; and a second end portion inserted into an opening of a housing of the gas chromatography unit, and the second end portion is inserted into the opening via a heat insulating member.

[0015] Advantages of the Invention

[0016] According to the present invention, it is possible to improve the uniformity of the temperature distribution of the interface portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram showing a schematic configuration of a gas chromatography mass spectrometry apparatus.

[0018] Figure 2 is a cross-sectional view showing details of the interface portion.

[0019] Figure 3 is a view showing a comparative example.

[0020] Figure 4 is a view showing the axial temperature distribution.

[0021] Figure 5 is a view showing the axial temperature distribution.

[0022] Figure 6 is a view showing Modification 1.

[0023] Figure 7 is a view showing Modification 2.

[0024] Figure 8 is a view showing Modification 4. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, a mode for carrying out the present invention will be described with reference to the accompanying drawings. Figure 1 FIG. Figure 1 schematically shows a schematic configuration of a gas chromatography mass analyzer. The gas chromatography mass analyzer 1 includes a gas chromatography unit 10, an interface unit 20, and a mass analysis unit 30. The gas chromatography unit 10 separates each component mixed in the sample in time. The interface unit 20 connects the gas chromatography unit 10 and the mass analysis unit 30, and introduces the sample whose components have been separated by the gas chromatography unit 10 into the mass analysis unit 30. The mass analysis unit 30 separates and detects the components separated by the gas chromatography unit 10 based on "m / z".

[0026] The gas chromatography unit 10 includes an oven 11, a chromatographic column 12, and a syringe 13. Although not shown, the syringe 13 has a sample vaporization chamber for heating a liquid sample to vaporize it, and supplies a carrier gas (e.g., He gas) at a specified flow rate to the sample vaporization chamber. The liquid sample injected into the sample vaporization chamber through a microsyringe or the like is vaporized in the sample vaporization chamber and is sent to the inside of the chromatographic column 12 along with the carrier gas. The chromatographic column 12 is heated to an appropriate temperature by the oven 11.

[0027] The vaporized sample (i.e., sample gas) moves in the chromatographic column 12 together with the carrier gas. Although the sample gas contains multiple components, since the advancing speed in the chromatographic column 12 varies depending on the component, a difference occurs in the time when each component reaches the outlet of the chromatographic column 12. As a result, each component reaches the outlet of the chromatographic column 12 separated in time.

[0028] The interface unit 20 includes a pipe system (line pipe) 21 into which the sample outlet side line of the chromatographic column 12 is inserted and a heating block 22 for heating the pipe system 21. By heating the pipe system 21 using the heating block 22, the chromatographic column 12 inside the pipe system 21 is also heated.

[0029] The mass analysis unit 30 includes an ionization chamber 31, a separation unit 32, and a detection unit 33. The ionization chamber 31, the separation unit 32, and the detection unit 33 are housed in a vacuum enclosure 34 that is evacuated by a vacuum pump 35. An electron source (not shown) that generates an electron beam for ionization is provided in the ionization chamber 31, and the sample molecules introduced into the ionization chamber 31 from the interface unit 20 are ionized by the electron beam. The generated ions are transported from the ionization chamber 31 to the separation unit 32 and are separated by the separation unit 32 based on "m / z". The separated ions are detected by the detection unit 33.

[0030] Figure 2It is a cross-sectional view showing the details of the interface section 20. The interface section 20 is fixedly provided in the vacuum housing 34 between the gas chromatography section 10 and the mass spectrometry section 30, specifically between the column oven 11 on the right side in the figure and the ionization chamber 31 on the left side, as will be described later. The interface section 20 includes: a partition wall section 24 having a partition wall 240 and a flange 241; a pipe system 21 fixed to the partition wall 240; a heating block 22 provided with a heater 23; and a nut member 25. The heater 23 uses, for example, a cylindrical heater. The pipe system 21 encloses the sample outlet side pipeline 12a of the chromatographic column 12, and the sample is introduced into the ionization chamber 31 from the front end of the pipe system 21. The front end side of the pipe system 21 is fixed to the partition wall 240 in a manner of penetrating the partition wall 240 inside and outside. The pipe system 21 is fixed to the partition wall 240 by welding. A cover 26 is installed at the front end of the pipe system 21.

[0031] An opening 340 for fixing the partition wall section 24 is formed in the vacuum housing 34 that houses the ionization chamber 31, the separation section 32, and the detection section 33. By bolt-fixing the flange 241 provided on the partition wall section 24 to the vacuum housing 34, the opening 340 is blocked by the partition wall section 24 to which the pipe system 21 is fixed. A vacuum seal 242 is provided between the flange 241 and the vacuum housing 34. When the partition wall section 24 is fixed to the vacuum housing 34, the front end portion of the pipe system 21 with the cover 26 installed is inserted into the opening 310 of the ionization chamber 31.

[0032] The illustrated right end region of the pipe system 21 into which the column 12 is inserted is inserted into the column oven 11. An external thread 210 that engages with the internal thread 250 formed in the nut member 25 is formed on the outer peripheral surface of the illustrated right end portion of the pipe system 21. The heating block 22 is provided so as to surround the periphery of the pipe system 21. For example, a through hole 220 penetrating in the axial direction is formed in the cylindrical heating block 22, and the pipe system 21 is inserted into the through hole 220.

[0033] By externally inserting the heating block 22 into the pipe system 21 and screwing the nut member 25 onto the external thread 210 of the pipe system 21, the heating block 22 is fixed to the pipe system 21 in such a manner that the end face 222 is in direct contact with the partition wall 240. Therefore, the partition wall 240 is directly heated by the heating block 22 without passing through other components and can reach a temperature approximately equal to that of the heating block 22. With such a structure, heat conduction from the partition wall 240 to the vacuum housing 34 can be suppressed, preventing the temperature of the pipe system 21 from decreasing due to heat dissipation through the partition wall 240, and the temperature uniformity related to the axial direction of the pipe system 21 can be improved. In particular, a temperature decrease on the vacuum housing 34 side of the pipe system 21 can be suppressed, and the temperature can be made more uniform between the column oven 11 side and the vacuum housing 34 side of the pipe system 21 compared to the prior art. Additionally, the thickness of the partition wall 240 is set to be relatively thin to increase the thermal resistance. Furthermore, by forming it into a concave shape, the distance (i.e., the thermal resistance) between the heating block contact area and the flange 241 is increased. Moreover, by forming it into a concave shape, the heating block contact area can be made closer to the front end of the pipe system 21, and the front end of the pipe system 21 can be heated as much as possible.

[0034] On the other hand, in the case of the invention described in Patent Document 1, the pipe system is installed on the partition wall portion via a thermal resistance portion, and the heating block is in thermal contact with the partition wall portion via a heat-conducting member. However, since the heat-conducting member only contacts a part of the partition wall portion, the temperature of the partition wall portion tends to be lower than that of the heating block, and heat escape from the pipe system via the thermal resistance portion cannot be ignored. Therefore, the temperature of the front-end portion of the pipe system becomes lower than that of the portion heated by the heater block, and the temperature uniformity related to the axial direction of the pipe system decreases. As a result, problems such as adsorption of the sample (high-boiling components) to the low-temperature portion are likely to occur.

[0035] Furthermore, by tightening the nut member 25 to press the end face 221 of the heating block 22, the end face 222 of the heating block 22 is pressed against the partition wall 240. As a result, the end face 222 can be reliably brought into contact with the partition wall 240 with a simple structure, and deviation in the contact state due to deviation in the assembly operation can be prevented. Furthermore, by the nut member 25 pressing the end face 222 against the partition wall 240, the contact surface pressure of the end face 222 with respect to the partition wall 240 increases. As a result, the heat conduction efficiency from the heating block 22 to the partition wall 240 is improved, and the temperature difference between the heating block 22 and the partition wall 240 can be further reduced.

[0036] For example, in Figure 3 the case of the mounting structure shown in the comparative example, the pipe system 21 is received in a groove 223 formed in the heating block 22A, and the heating block 22B is bolted to the heating block 22A, thereby fixing the heating blocks 22A and 22B to the pipe system 21 in a manner that sandwiches the pipe system 21. In the case of the comparative example, Figure 2In a structure such as the nut member 25 shown, where the heating blocks 22A and 22B are pressed against the partition wall 240, due to deviations in the assembly operation, the contact between the heating blocks 22A and 22B and the partition wall 240 becomes insufficient or gaps are generated, making it difficult to obtain a good contact state.

[0037] Figure 4 , 5 is used to illustrate Figure 2 the differences between the present embodiment shown Figure 3 and the comparative example shown, and shows the axial temperature distribution of the pipe system 21. Figure 4 It shows the case where the temperature of the ionization chamber 31 is 200 °C and the temperature of the heating blocks 22 (22A, 22B) is 250 °C. Figure 5 It shows the case where the temperature of the ionization chamber 31 and the heating blocks 22 (22A, 22B) is 280 °C. In Figure 4 , 5 , the solid lines L1 and L2 show the temperature distribution in the case of the present embodiment, and the dashed lines L3 and L4 show the temperature distribution in the case of the comparative example. In Figure 4 , 5 , the vertical axis represents temperature and the horizontal axis represents the distance from the front end of the pipe system 21. The distance d1 is the distance from the front end of the pipe system to the partition wall 240 to which the pipe system 21 is fixed. That is, referring to Figure 2 , in the distance d1 on the horizontal axis, the pipe system 21 is fixed to the partition wall 240, and the front end of the pipe system 21 inserted into the vacuum housing 34 from the partition wall 240 corresponds to the position where the horizontal axis distance is zero.

[0038] Refer to Figure 4 for the description.

[0039] In Figure 2 the case of the present embodiment shown, the area on the right side of the illustration of the position of the partition wall 240 and the partition wall 240 of the pipe system 21 is heated to 250 °C by the heating block 22, and the wall portion of the ionization chamber 31 is maintained at 200 °C by a heater or the like. As heat dissipation in the partition wall fixing area of the pipe system 21, it is roughly limited to heat conduction to the ionization chamber 31 and heat dissipation from the portion of the pipe system 21 protruding into the vacuum housing 34 ( Figure 4 the area from 0 to d1 of Figure 4 ). When observing the pipeline L1 of

[0040] On the other hand, in Figure 3In the case of the comparative example shown, there is a gap between the heating blocks 22A and 22B and the partition wall 240, and the structure is such that the partition wall 240 is not directly heated by the heating blocks 22A and 22B. The temperature of the partition wall 240 fixed to the vacuum outer shell 34 by the flange 241 is likely to be lower than the temperature (250 °C) of the heating blocks 22A and 22B. As a result, the heat of the pipe system 21 not only dissipates from the front end portion protruding from the partition wall 240, but also escapes to the vacuum outer shell 34 via the partition wall 240. In addition, when the contact between the heating blocks 22A and 22B and the partition wall 240 is insufficient, the heat escaping to the vacuum outer shell 34 via the partition wall 240 cannot be ignored either. As a result, as shown by the pipeline L3 in Figure 4 , the temperature starts to decrease from around the front end 3×d1, and decreases to around 220 °C at the front end. That is, the temperature non-uniformity in the axial direction of the pipe system 21 becomes larger, and a temperature difference of about 30 °C is generated.

[0041] Refer to Figure 5 for description.

[0042] Figure 5 Fig. shows the temperature distribution when the temperatures of the ionization chamber 31 and the heating blocks 22 (22A, 22B) are maintained at the same temperature (= 280 °C). In the case of the present embodiment shown by the pipeline L2, it shows a temperature distribution tendency substantially the same as that of Figure 4 L1, and the temperature difference between the high temperature part and the low temperature part is also suppressed to be small, about 3 °C. As a result, adsorption of the sample (high boiling point component) in the interface part 20 can be prevented.

[0043] On the other hand, in the case of the comparative example shown by the pipeline L4, it decreases significantly from the distance 3×d1 to the distance d1, and rises from around the distance d1 to the front end. This affects the case where heat escapes from the partition wall fixing part of the pipe system 21 to the vacuum outer shell 34 side via the partition wall 240, and the temperature decreases significantly near the partition wall fixing part (the position at the distance d1 from the front end). The temperature difference between the high temperature part and the low temperature part related to the axial direction of the pipe system 21 is about 15 °C, which is larger than the case of the pipeline L2.

[0044] From Figure 4 , Figure 5 it can be seen that in a configuration such as the comparative example in Figure 3 , the temperature of the partition wall 240 is lower than the temperature of the part heated by the heating blocks 22A and 22B of the pipe system 21, and the heat transfer to the vacuum outer shell 34 side via the partition wall 240 is large. Therefore, the temperature decrease near the fixing part of the pipe system 21 becomes larger, the temperature distribution becomes uneven, and adsorption of the sample (high boiling point component) is likely to occur in the low temperature part.

[0045] (Variant Example 1)

[0046] Figure 6This is a diagram showing Modification Example 1 of the above-described embodiment. In Modification Example 1, a disc spring 251 as a spring member is provided between the nut member 25 and the end face 221 of the heating block 22. Other configurations are the same as those in Figure 2 the case shown. By rotating and tightening the nut member 25, the disc spring 251 deforms, and the heating block 22 is pressed in the direction of the partition wall 240, and the end face 222 abuts against the partition wall 240.

[0047] In this way, by using the disc spring 251, the surface pressure of the end face 222 with respect to the partition wall 240 can be controlled to a magnitude corresponding to the spring constant of the disc spring 251. In this case, it is also possible to increase the surface pressure of the end face 222 with respect to the partition wall 240, and the heat conduction efficiency from the heating block 22 to the partition wall 240 can be improved, thereby reducing the temperature difference between the heating block 22 and the partition wall 240. As a result, similar to the case of the configuration in Figure 2 the axial temperature distribution of the pipe system 21 can be maintained more uniformly.

[0048] In addition, as the spring member, as long as it is a member that elastically deforms according to the tightening amount (i.e., the rotation amount) of the nut member 25, it is not limited to the disc spring 251, and for example, a corrugated washer can also be used.

[0049] However, in the case of the configuration shown in Figure 2 , when the heating block 22 thermally expands due to heating, there will be a problem of excessive shear stress being applied to the screwed portion between the nut member 25 and the pipe system 21. On the other hand, in the case of the configuration shown in Figure 6 , since the thermal expansion of the heating block 22 is absorbed by the deformation of the disc spring 251, it is possible to prevent the shear stress from becoming excessive.

[0050] (Modification Example 2)

[0051] Figure 7 This is a diagram showing Modification Example 2 of the above-described embodiment. In Modification Example 2, a pair of fixing plates 225 is provided as a fixing portion for fixing the heating block 22 in a state of being in contact with the partition wall portion 24 at the interface portion 20 instead of the nut member 25 shown in Figure 2 . The heating block 22 is composed of a cylindrical region with a diameter D1 and a cylindrical region with a diameter D2 (>D1), and an annular step surface 224 is formed at their boundary portion. A pair of fixing plates 225 for fixing the heating block 22 to the partition wall portion 24 is fixed to the upper surface of the flange 241 by bolts, and the front end of the fixing plate 225, that is, the inner peripheral side front end of the fixing plate 225 formed in a ring shape, abuts against the step surface 224 of the heating block 22.

[0052] The height H1 from the end face 222 of the heating block 22 to the stepped surface 224 is set to be greater than the height H2 from the bottom plate of the partition wall 240 to the upper surface of the flange 241 (H1 > H2). If the fixing plate 225 is bolted to the upper surface of the flange 241, the portion of the diameter D2 of the heating block 22 is clamped between the fixing plate 225 and the partition wall 240, and the end face 222 of the heating block 22 is pressed against the partition wall 240. In addition, if the fixing plate 225 is formed of an elastically deformable member such as a thin plate or a spring plate, as Figure 7 shown, the fixing plate 225 elastically deforms during bolting. The end face 222 of the heating block 22 is pressed against the partition wall 240 by the elastically deformed fixing plate 225.

[0053] In this way, the end face 222 contacts the partition wall 240 with a large surface pressure, thereby improving the heat conduction efficiency from the heating block 22 to the partition wall 240 and further reducing the temperature difference between the heating block 22 and the partition wall 240. As a result, the axial temperature distribution of the pipe system 21 can be maintained more uniformly in the same way as in the case of the Figure 2 configuration. In addition, in the above example, a pair of fixing plates 225 is provided, but the number of fixing plates 225 is not limited to 2, and a circular fixing plate can also be provided, or three or more rectangular fixing plates can be provided.

[0054] (Modification 3)

[0055] As Figure 3 shown, in the case of a heating block having a configuration in which the heating blocks 22A and 22B are fixed to the pipe 21 in a manner of sandwiching the pipe 21, the nut member 25 shown in Figure 2 , the nut member 25 shown in Figure 7 and the disc spring 251 shown in Figure 7 can also be applied. By adopting such a configuration, the end faces of the heating blocks 22A and 22B can be pressed against the partition wall 240, and the uniformity of the axial temperature distribution of the pipe system 21 can be improved. In addition, a stepped surface as shown in

[0056] (Modification 4)

[0057] In the modification 4 shown in Figure 8 , a heat insulating member 111 formed of a material having a low thermal conductivity is disposed between the pipe system 21 and the opening 110. By adopting such a configuration, heat can be prevented from escaping from the exposed portion of the pipe system 21 to the external gas. In addition, the heat insulating member 111 can also be applied in the modification 1 and 2 shown in Figure 6 , 7 .

[0058] Those skilled in the art can understand that the above exemplary embodiments and various variations are specific examples of the following solutions.

[0059] [1] A gas chromatography mass spectrometry device according to one solution includes: a gas chromatography unit having a chromatographic column for separating components of a sample; a mass spectrometry unit disposed within a vacuum enclosure; and an interface unit for introducing the sample whose components have been separated by the gas chromatography unit into the mass spectrometry unit. The interface unit includes: a partition wall portion fixed to the vacuum enclosure so as to block an opening formed in the vacuum enclosure; a piping system fixed to the partition wall portion so as to penetrate through the partition wall portion inside and outside, enclosing the sample outlet side pipeline of the chromatographic column and introducing the sample into the mass spectrometry unit; a heating unit for heating the piping system in the axial direction; and a fixing unit for fixing the heating unit in a state where the heating unit is in contact with the partition wall portion.

[0060] Since the heating unit is provided in a state of being in contact with the partition wall portion through the fixing unit, the partition wall portion is directly heated by the heating unit. Therefore, the temperature difference between the partition wall portion and the piping system heated by the heating unit can be reduced, and heat escaping from the piping system to the vacuum enclosure via the partition wall portion can be suppressed. As a result, the uniformity of the temperature distribution of the piping system enclosing the chromatographic column is improved, and adsorption of the sample (high boiling point components) to the low temperature portion can be reduced.

[0061] [2] In the gas chromatography mass spectrometry device described in the above [1], the fixing unit presses the heating unit against the partition wall portion. By pressing the heating unit against the partition wall portion, the surface pressure of the contact portion between the heating unit and the partition wall portion further increases, and the heat conduction efficiency from the heating unit to the contact portion is improved. As a result, the temperature difference between the partition wall portion and the piping system is further reduced.

[0062] [3] In the gas chromatography mass spectrometry device described in the above [2], the heating unit is externally inserted into the piping system, and the fixing unit may be a nut member formed with an internal thread portion that engages with an external thread portion formed on the outer periphery of the piping system. If the nut member is rotated and tightened relative to the piping system, the heating unit is fixed in a state of being pressed against the partition wall portion. By pressing the heating unit against the partition wall portion, the temperature difference between the partition wall portion and the heating unit is reduced, and heat escaping from the piping system heated by the heating unit to the vacuum enclosure via the partition wall portion can be suppressed.

[0063] [4] In the gas chromatography mass spectrometry device described in the above [3], a spring member is disposed between the nut member and the heating unit. Even when the heating unit thermally expands, the spring member deforms, so that excessive shear stress can be prevented from being applied to the threaded portion between the fixing unit and the piping system.

[0064] [5] In the gas chromatography mass analysis device described in [2] above, the fixing portion may also be a fixing plate that is fixed to the partition wall portion and sandwiches the heating portion between the fixing plate and the partition wall portion. The heating portion is sandwiched between the partition wall portion and the fixing plate, and the surface pressure of the contact portion between the heating portion and the partition wall portion can be increased.

[0065] [6] In the gas chromatography mass analysis device according to any one of [1] to [5] above, the pipe system is a rod-shaped member having a first end portion fixed to the partition wall portion in such a manner as to penetrate the partition wall portion internally and externally, and a second end portion inserted into an opening of a housing of the gas chromatography portion. The second end portion is inserted into the opening via a heat insulating member. Since the second end portion is inserted into the opening via the heat insulating member, heat can be prevented from escaping from the exposed portion of the pipe system to the external gas.

[0066] As described above, various embodiments and modification examples have been described, but the present invention is not limited to these. Other modes conceived within the scope of the technical idea of the present invention are also included in the scope of the present invention.

[0067] Description of Reference Numerals

[0068] 1 Gas chromatography mass analysis device

[0069] 10 Gas chromatography portion

[0070] 12 Chromatographic column

[0071] 20 Interface portion

[0072] 21 Pipe system

[0073] 22, 22A, 22B Heating block

[0074] 23 Heater

[0075] 24 Partition wall portion

[0076] 25 Nut member

[0077] 30 Mass analysis portion

[0078] 31 Ionization chamber

[0079] 32 Separation portion

[0080] 33 Detection portion

[0081] 34 Vacuum housing

[0082] 111 Heat insulating member

[0083] 210 External thread

[0084] 225 Fixing plate

[0085] 240 Partition wall

[0086] 250 internal threads.

Claims

1. A gas chromatography mass analysis device, characterized in that, Comprising: A gas chromatography section having a chromatographic column for separating components of a sample; A mass spectrometry section disposed within a vacuum enclosure; An interface section for introducing the sample, which has been component-separated by the gas chromatography section, into the mass spectrometry section, The interface section comprising: A partition wall section having a concave partition wall and a flange, and fixed to the vacuum enclosure so as to block an opening formed in the vacuum enclosure; A pipe system fixed to the partition wall so as to penetrate the partition wall internally and externally, and enclosing the sample outlet-side pipeline of the chromatographic column to introduce the sample into the mass spectrometry section; A heating section having, at one end face and the other end face in the axial direction of the pipe system, heating the pipe system along the axial direction; A fixing section pressing the one end face in the axial direction of the heating section against the partition wall, The heating section is arranged to surround the periphery of the pipe system.

2. The gas chromatography mass spectrometry device according to claim 1, wherein The heating section is externally inserted into the pipe system, The fixing section is a nut member formed with an internal thread portion that engages with an external thread portion formed on the outer periphery of the pipe system, When the nut member is rotationally tightened relative to the pipe system, the heating section is fixed in a manner of being pressed against the partition wall.

3. The gas chromatography mass spectrometry device according to claim 2, wherein A spring member is disposed between the nut member and the heating section.

4. The gas chromatography mass spectrometry device according to claim 1, wherein The fixing section is a fixing plate fixed to the partition wall section and clamping the heating section between the fixing plate and the partition wall section.

5. The gas chromatography mass spectrometry device according to any one of claims 1 to 4, wherein The pipe system is a rod-shaped member having a first end portion fixed to the partition wall so as to penetrate the partition wall internally and externally, and a second end portion inserted into an opening of a housing of the gas chromatography section, The second end portion is inserted into the opening via a heat insulating member.

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