A gas mass spectrometer

Abstract

This utility model discloses a gas mass spectrometer, belonging to the field of gas detection technology. Its key technical features include a gas mass spectrometer main unit with a connecting gas tube and a fixture. A detachable external filter is installed on the lower part of the fixture's side wall. The detachable external filter includes a housing, a filter element disposed within the housing, a flange joint disposed at the left end of the housing and communicating with the interior of the housing, and a quick-connect sealing male connector disposed at the right end of the housing and communicating with the interior of the housing. The end of the connecting gas tube is provided with a quick-connect sealing female connector matching the quick-connect sealing male connector and a fastening nut. According to this application, on the one hand, a detachable connection between the external filter and the fixture is achieved, with high connection strength and good sealing performance; on the other hand, a quick connection between the connecting gas tube and the detachable external filter is achieved, while ensuring the sealing performance of the connection.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a gas mass spectrometer. Background Technology

[0002] A gas mass spectrometer (GC-MS) is a high-precision instrument used to analyze the composition of gases. It provides qualitative and quantitative information by ionizing, separating, and detecting gas molecules or atoms. GC-MS can be used for product leak detection, and due to its high sensitivity, rapid response, and strong selectivity, it has become one of the core technologies in the industrial leak detection field. The sampling tube of a GC-MS is connected to a fixture. During testing, the sample to be tested is placed in the fixture. First, a vacuum pump system extracts the gas surrounding the sample, and then the test gas is introduced into the fixture. Conventional fixtures are openable and closable box structures, which are easily contaminated with dust, impurities, and ambient moisture during daily use, causing gas contamination. This not only affects the accuracy of the test but can also damage the GC-MS. To address these technical problems, an external filter is used to filter the gas. However, the connection and fit between the external filter, the fixture, and the gas tubing are not ideal. This manifests in poor connection tightness and sealing, and inconvenience in assembling and disassembling the gas tubing. Utility Model Content

[0003] The purpose of this invention is to provide a gas mass spectrometer that can solve the problems of existing gas mass spectrometers.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A gas mass spectrometer includes a main unit with a connecting gas tube and a fixture. A removable external filter is installed on the lower part of the side wall of the fixture. The removable external filter includes a housing, a filter element disposed within the housing, a flange joint disposed at the left end of the housing and communicating with the interior of the housing, and a quick-connect sealing male joint disposed at the right end of the housing and communicating with the interior of the housing. The end of the connecting gas tube is provided with a quick-connect sealing female joint and a fastening nut that match the quick-connect sealing male joint. The flange joint includes a flange with a stepped through hole in the middle, and a sealing component nested within the flange. The sealing component includes an annular main body that matches the upper port diameter of the stepped through hole, a hollow cylindrical part vertically disposed on the end face of the annular main body facing the stepped through hole, and an annular groove is formed on the end face of the annular main body at that end, in which a first sealing ring is embedded. An annular groove is formed on the end face of the other end of the annular main body, in which a second sealing ring is embedded.

[0006] Furthermore, an air inlet is provided on the lower part of the side wall of the fixture, and connection holes for connecting the flange are provided around the air inlet.

[0007] Furthermore, the annular main body and the hollow cylindrical part are coaxially arranged, and the diameter of the hollow cylindrical part is smaller than the diameter of the annular main body.

[0008] Furthermore, a fixing stop for limiting the position of the fastening nut is fixed in the middle of the male end of the quick-connect sealing connector.

[0009] Furthermore, an external thread is tapped on the outer wall of the male quick-connect sealing connector located at the right end of the fixed stop, and an annular groove is formed on the right end face of the male quick-connect sealing connector, and a third sealing ring is provided in the groove.

[0010] Furthermore, the quick-connect sealing connector includes a cylindrical body that connects to the end of the connecting air pipe. The end of the cylindrical body is provided with a 180° flange, and the middle of the cylindrical body is provided with an annular protrusion that protrudes relative to its sidewall.

[0011] Furthermore, the fastening nut has a variable diameter structure, with the diameter at the left end being larger than that at the right end. The inner wall of the fastening nut is stepped, including the inner wall at the right end and the inner wall at the left end. The inner wall at the left end is tapped with an internal thread that matches the external thread, while the inner wall at the right end is smooth.

[0012] Furthermore, after assembly, the end face of the right inner wall of the fastening nut abuts against the annular protrusion, and the 180° flange abuts against the right end face of the quick-connect sealing connector male and presses the third sealing ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) This application takes the gas mass spectrometer main unit and fixture as the main body, and sets a detachable external filter on the fixture. The fixture and the detachable external filter are connected by a flange joint. The flange joint is nested with a sealing component, which not only realizes the detachable connection between the external filter and the fixture, but also has high connection firmness and good connection sealing performance.

[0015] (2) In this application, the other end of the external filter is provided with a quick-connect sealing connector male, and the end of the connecting air pipe is provided with a quick-connect sealing connector female and a fastening nut that match the quick-connect sealing connector male. The end of the quick-connect sealing connector male is provided with a third sealing ring, and the end of the quick-connect sealing connector female is provided with a 180° flange. After assembly, the end face of the right end inner wall of the fastening nut abuts against the annular protrusion, and the 180° flange abuts against the right end face of the quick-connect sealing connector male and presses the third sealing ring. This not only enables the quick connection between the connecting air pipe and the detachable external filter, but also ensures the sealing of the connection between the two. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of the present invention;

[0017] Figure 2 for Figure 1 Enlarged schematic diagram of part A (not assembled);

[0018] Figure 3 This is an assembly diagram of the male and female quick-connect sealing connectors in this utility model.

[0019] Figure 4 This is a schematic diagram of the detachable external filter in this utility model;

[0020] Figure 5 This is a schematic diagram of the fixture in this utility model.

[0021] Figure 6 This is a partial schematic diagram of the flange joint in this utility model.

[0022] Figure 7 This is a schematic diagram of the sealing component in this utility model.

[0023] In the diagram, 1. Gas mass spectrometer main unit; 2. Connecting gas tubing; 3. Fixture; 4. Removable external filter; 5. Housing; 6. Flange joint; 7. Quick-connect sealing male connector; 8. Quick-connect sealing female connector; 9. Fastening nut; 10. Stepped through hole; 11. Flange; 12. Annular main body; 13. Hollow cylindrical part; 14. First sealing ring; 15. Second sealing ring; 16. Air inlet; 17. Connecting hole; 18. Fixing stop; 19. Third sealing ring; 20. Cylindrical main body; 21. 180° flange; 22. Annular raised edge; 23. Right end inner wall; 24. Left end inner wall; 25. Filter element. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-7 The technical solution provided by this utility model is as follows:

[0026] A gas mass spectrometer includes a main unit and a fixture. The main unit is connected to the fixture via a gas tube. The fixture is used to hold the product to be tested. The main unit exchanges gas with the interior of the fixture via the gas tube. In this embodiment, a detachable external filter is provided on the lower part of the side wall of the fixture to filter the gas extracted from the interior of the fixture and prevent contaminated gas from entering the main unit.

[0027] In this embodiment, an air inlet is provided on the lower part of the side wall of the fixture, and three connecting holes are arranged in a ring array around the air inlet. The fixture and the detachable external filter are connected by a flange connection structure, which provides strong stability.

[0028] The structure of the detachable external filter is as follows: a cylindrical outer shell with a flange joint on the left end and a quick-connect sealing male joint on the right end at its axial ends, both of which are connected to the interior of the outer shell to allow gas to enter and exit; the outer shell has a built-in filter screen for filtering dust impurities, ambient moisture, etc. in the gas. Those skilled in the art can select a suitable filter element according to actual needs. The gas in the fixture enters the gas mass spectrometer main unit in sequence through the flange joint, the inner cavity of the outer shell (filter element), and the quick-connect sealing male joint.

[0029] The flange joint specifically includes: a flange with a stepped through-hole in the middle, the upper port diameter D1 of which is larger than the lower port diameter D2; and a sealing component, nested within the stepped through-hole of the flange, comprising: an annular main body with an outer diameter matching D1; and a hollow cylindrical part, with an outer diameter matching D2, perpendicularly disposed on one end face of the annular main body (facing the flange during assembly) and coaxially arranged. An annular groove is provided around the bottom of the hollow cylindrical part on this end face, and a first sealing ring, such as a silicone sealing ring, with a compressed thickness of 1.5 mm, is embedded in the groove. An annular groove is also provided on the other end face of the annular main body, and a second sealing ring 424, such as a silicone sealing ring, with a compressed thickness of 2 mm, is embedded in the groove. The flange holes are aligned with the connection holes and secured with bolts to achieve the connection between the detachable external filter and the fixture.

[0030] The detachable external filter is connected to the connecting air tube via a quick-connect sealing male and female connector, specifically:

[0031] The male quick-connect sealing connector has a fixed stop in the middle for limiting the position of the fastening nut. The stop is 5mm wide. Based on the fixed stop, the outer side wall of the right end is provided with external threads. The right end face of the male quick-connect sealing connector has an annular groove, and a third sealing ring, such as a silicone sealing ring, is provided in the groove.

[0032] The quick-connect sealing connector includes a cylindrical body that connects to the end of the connecting air pipe. The end of the cylindrical body is provided with a 180° flange, with the flange direction extending outward. Based on the 180° flange, the end of the quick-connect sealing connector can effectively compress the third sealing ring and form a seal with the third sealing ring. An annular protrusion is provided in the middle of the cylindrical body, protruding relative to its side wall, with a protrusion height of 1.2mm.

[0033] The fastening nut has a variable diameter structure, with the diameter of its left end being larger than that of its right end. The inner wall of the fastening nut is stepped, including the inner wall of the right end and the inner wall of the left end. The inner wall of the left end is tapped with an internal thread that matches the external thread, while the inner wall of the right end is smooth. The fastening nut is fitted onto the outside of the quick-connect sealing connector female head and can move freely relative to the quick-connect sealing connector female head to achieve a direct threaded connection with the quick-connect sealing connector female head.

[0034] Assembly process:

[0035] Install the sealing component into the flange and fix the flange to the air inlet of the fixture with bolts. At this time, the second sealing ring forms a surface seal with the fixture wall, and the first sealing ring is pressed by the inner wall of the stepped through hole. Align the 180° flange of the female quick-connect sealing connector with the end face of the male connector, and rotate the fastening nut so that its left end thread engages with the external thread of the male connector. When the left end face of the fastening nut abuts against the fixing stop, the assembly is complete. At this time, the end face of the right end inner wall of the fastening nut abuts against the annular protrusion, and the 180° flange abuts against the right end face of the male quick-connect sealing connector and presses the third sealing ring to form a seal.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas mass spectrometer comprising a gas mass spectrometer main unit (1) having a connection gas pipe (2), and a jig (3), characterized by: A removable external filter (4) is installed on the lower part of the side wall of the fixture (3). The removable external filter (4) includes a housing (5), a filter element (25) disposed in the housing (5), a flange joint (6) disposed at the left end of the housing (5) and communicating with the interior of the housing (5), and a quick-connect sealing male joint (7) disposed at the right end of the housing (5) and communicating with the interior of the housing (5). The end of the connecting air pipe (2) is provided with a quick-connect sealing female joint (8) and a fastening nut (9) that match the quick-connect sealing male joint (7). The flange joint (6) The flange (11) includes a stepped through hole (10) in the middle, and a sealing component nested in the flange (11). The sealing component includes an annular body (12) that matches the upper port diameter of the stepped through hole (10), a hollow cylindrical part (13) that is vertically disposed on the end face of the annular body (12) facing the stepped through hole (10), and an annular groove is formed on the end face of the annular body (12) at that end and a first sealing ring (14) is embedded in the groove. An annular groove is formed on the end face of the other end of the annular body (12) and a second sealing ring (15) is embedded in the groove.

2. A gas mass spectrometer according to claim 1, characterised in that: An air inlet (16) is provided on the lower part of the side wall of the fixture (3), and a connection hole (17) for connecting the flange (11) is provided around the air inlet (16).

3. A gas mass spectrometer according to claim 2, characterised in that: The annular main body (12) and the hollow cylindrical part (13) are coaxially arranged, and the diameter of the hollow cylindrical part (13) is smaller than the diameter of the annular main body (12).

4. The gas mass spectrometer of claim 1, wherein: The quick-connect sealing connector male (7) is fixed with a fixing stop (18) for limiting the position of the fastening nut (9).

5. A gas mass spectrometer according to claim 4, characterised in that: External threads are tapped on the outer side wall of the quick-connect sealing connector male (7) located at the right end of the fixed stop (18), and an annular groove is provided on the right end face of the quick-connect sealing connector male (7), and a third sealing ring (19) is provided in the groove.

6. A gas mass spectrometer according to claim 5, characterised in that: The quick-connect sealing connector (8) includes a cylindrical body (20) connected to the end of the connecting air pipe (2). The end of the cylindrical body (20) is provided with a 180° flange (21), and an annular protrusion (22) protruding relative to its sidewall is provided in the middle of the cylindrical body (20).

7. A gas mass spectrometer according to claim 6, characterised in that: The fastening nut (9) has a variable diameter structure, with the diameter at the left end being larger than that at the right end. The inner wall of the fastening nut (9) is stepped, including the inner wall at the right end (23) and the inner wall at the left end (24). The inner wall at the left end (24) is tapped with an internal thread that matches the external thread, while the inner wall at the right end (23) is smooth.

8. A gas mass spectrometer according to claim 7, characterised in that: After assembly, the end face of the right inner wall (23) of the fastening nut (9) abuts against the annular protrusion (22), and the 180° flange (21) abuts against the right end face of the quick-connect sealing connector male (7) and presses the third sealing ring (19).

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