JPS59845A - Sample introducing device of mass spectrometer - Google Patents

Abstract

PURPOSE:To exchange a leak member, by provding an opening part to a partition between the second vessel communicated to a spectrometer main unit and the first vessel and supporting the leak member to the opening part while removably further airtightly mounting supporting members having a communication part. CONSTITUTION:A sample introducing port 3 of a vessel 2 is connected to a sample introducing tube 1, and a valve mechanism 10 is mounted to the vessel 2. A vessel 5 is integrally formed with the vessel 2 through a partition 4. A sample lead out port 6 is provided to the vessel 5 and connected to an ionizing chamber 8 provided to a mass spectrometer 7. An opening part 5a is provided to a position of the vessel 5 oppositely facing to the partition 4, and supporting members 21, 22 supporting a capillary 9 used as a leak member are mounted. A hollow 22a communicated to a hollow 9a of the capillary 9 is formed to the supporting member 22, while a groove 21a communicating the hollow 22a to the vessel 5 is formed to the supporting member 21. Furhter O-rings 23, 24 are inserted between the supporting member 21 and the vessel 5 and the supporting member 22 and the partition 4, and the vessel 5 is airtightly sealed. In consequence, the capillary 9 can be easily exchanged.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mass spectrometer that analyzes samples such as respiratory gas, and particularly relates to a sample introduction method for restricting the flow rate of the sample and guiding it to the main body of the armpit analyzer. Regarding equipment.

[Technical background of the invention and its problems]

In a mass spectrometer, a sample introduction device that is equipped with a valve mechanism that restricts the amount of sample flowing into the analysis tube is generally installed between the sample introduction tube that collects and introduces the sample and the analysis tube of the mass spectrometer body. Ru. This kind of sample introduction device is
It is usually located in the viscous flow region or intermediate flow chain acid of the introduced sample (gas), and has a high responsiveness to samples with rapid state changes.
It is required to have excellent versatility for r-species samples, and to have a structure that reduces the degree of vacuum within the analysis tube.

A sample introduction device for a mass spectrometer having a structure as shown in FIG. 1 has already been proposed as one that substantially satisfies these requirements (Japanese Patent Application No. 51-11-1-1.527). In the figure, 1 is a sample introduction tube for collecting a sample and introducing it into the sample introduction device, and this tube 1 has a sample introduction tube 1 in a first container 2 called a sampling chamber.
3 is connected. A second container 5 serving as a valve is integrally formed with the first container 2, with a partition wall 4 interposed therebetween. The second container 5 is provided with a sample 2, 1f output 1'' 6, and this sample output Ll 6 is connected to an ionization chamber 8 in an analysis tube provided in the main body 7 of the analyzer 814.

A thin tube 9 called a capillary, which serves as a leak member that communicates the two containers, is provided perpendicularly through the partition wall 4 between the first and second containers z and 5)f. The first container 2111 of this capillary 9 is open.
Fhi (inlet side opening surface) is the upper end surface of the partition wall 4 and the valve 1
41 is formed. A valve mechanism 1o including a valve body I which can move up and down is attached to the upper opening of the first container 2, facing the valve seat. That is, the valve body II is moved up and down by the electromagnet 12 to open and close the entrance side opening surface of the capillary 9, thereby blocking the introduction of the sample.

Furthermore, the flow rate of the sample from the first container 2 to the second container 5 through the capillary 9, that is, the flow rate of the sample introduced into the quality M analyzer main body 7, is limited to an appropriate value.

Note that an exhaust port 13 is bored in the valve body 11, and this exhaust port 13 is connected to a suction device 15 via a valve 14.

By the way, the sample to be analyzed by a mass spectrometer is not always clean, and usually contains dust, dust, etc., and especially in breathing gas, water vapor and dirt are also included as foreign substances. In this case, the capillary 9 serving as the leak member is a glass tube with an inner diameter of approximately 30 to 40 μm, and therefore is likely to be clogged by foreign matter contained in the sample. Naturally, if this happens, not only will analysis become impossible, but if the capillary 9 is left unblocked and continues to be used, the effects will spread to the bottom of the device, making it necessary to replace the entire device. There is also.

If the capillary 9 becomes clogged in this way, it can be replaced immediately. However, the capillary 9 is incorporated inside the sample introduction device as shown in FIG.
Since it is fixed with adhesive, the capillary 9
It is very difficult to replace a new one with a new one, and it requires a lot of effort and time. For this reason, in the past, clogging of the cavity 9 was prevented by attaching a filter to the tip of the gas introduction tube 1 to prevent foreign matter from entering. This is not a good idea as it means sacrificing improved responsiveness.

[Purpose of the invention]

An object of the present invention is to provide a sample introduction device for line analysis B in which leakage members such as capillaries can be easily replaced in a short period of time.

[Summary of the invention]

This invention provides an opening 1" in a position opposite to the partition wall between the second container and the first container that communicates with the mass spectrometer main body, supports the leak member in this opening, and supports the leak member on the exit side of the leak member. The present invention is characterized in that a support body having a communication portion that communicates the opening surface with the second container is detachably attached to the container so as to airtightly seal the opening.

〔Effect of the invention〕

According to this invention, the leak member can be quickly replaced only by attaching and detaching the support. Therefore, when the leak member is blocked, analysis can be continued with only a short pause period required for replacing the leak member, and time and economic losses are significantly reduced. In addition, since two cavities with different inner diameters can be used as leak members, it is possible to set the sample inflow rate that matches the characteristics of the device or analysis conditions, and all you have to do is replace the leak member. Therefore, it has the advantage of not having any impact on the properties of the pond.

[Implementation sequence of the invention]

FIG. 2 is a cross-sectional view of a sample introduction device of a mass spectrometer according to an embodiment of the present invention, and FIG. 3 is a perspective view showing the bottom part thereof, and the same or corresponding parts as in FIG. 1 are shown. are given the same reference numerals.

In FIG. 2, a 1 ml" section 5 is located at a position facing the partition wall 4 between the second container 5, which also serves as a valve box, and the first container 2.
A is provided, and a support for supporting a capillary 9 as a leak member is mounted thereon. In this example, this support body includes a first support body 21 that also serves as a lid that fits onto the wall of the second container 5 with screws, and a
1 and a second support 22 interposed between the capillary 9 and the capillary 9. As shown in FIG. 3, the second support body 22 is provided with a communication part for communicating the outlet side opening surface of the hollow 9a of the capillary 9 and the inside of the second container 5. A communicating hollow 22a is formed,
The first support 21 has a hollow 22 in the second support 22.
a and the inside of the second container 5 (42Z a is formed. Furthermore, the first support 21 and the second container 5
An O-ring z3.24 is inserted between the second support body 22 and the partition wall 4, and between the second support body 22 and the partition wall 4, thereby hermetically sealing the second container 5.

With such a configuration, when the capillary 9 becomes clogged, the first support 21 is removed from the opening 5a of the second container 5, and the capillary 9 is removed together with the second support 22. Since the capillary can be taken out to the outside, the capillary can be easily replaced with a new one.

Note that this invention can be implemented with various modifications.For example, in the above embodiment, the support body that supports the IS shrine has a two-part structure, but it may of course be a single component, or even The support body may be formed integrally with the leak member. It goes without saying that the present invention can also be applied in the same way when other structures such as a porous material are used in place of the capillary as the twisted or leakage part assembly.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the sample introduction device of a conventional direct analyzer.
FIG. 2 is a sectional view of a sample introduction device of a quality i analyzer according to an embodiment of the present invention, and FIG. 3 is a perspective view of the main part of FIG. 2. DESCRIPTION OF SYMBOLS 1... Sample introduction tube, 2... First container (sampling chamber), 3... Sample introduction port, 4... Partition wall, 5... Second container (valve box), 6... ...Sample outlet, 7.Site analyzer body, 8.Ionization chamber, 9.
...Capillary (leak member), 1o...Pulp mechanism, 21.22...Support body, 21a, 22a...Communication portion, 23.24...0 ring.

Claims (1)

[Claims] a first container having a sample inlet, a second container integrally formed with the first container via a partition wall and having a sample outlet communicating with the main body of the purchase analysis 1; a leak member provided through the partition wall so as to communicate the second container with the second container, and an inlet side opening surface of the leak member on the first container side to control the inflow of the sample into the mass spectrometer main body. In the sample introduction device for a mass spectrometer, the second container is provided with an opening 5it at a position opposite to the partition wall, the leak member is supported in this opening, and the outlet side of the leak member is A sample introduction device for a mass spectrometry needle, characterized in that a support body having a communication portion that communicates between an opening surface and a second container is detachably attached to the support body so as to airtightly seal the opening portion.