Gas chromatography testing device

Abstract

The utility model discloses a gas chromatography testing device which comprises a chromatographic column and a testing pipe, the chromatographic column is composed of a straight pipe and a bent pipe, one end of the straight pipe and one end of the bent pipe are respectively connected with a first hexagonal pipe, each first hexagonal pipe is connected with an external thread pipe, one end of each external thread pipe is internally provided with a mounting hole, the inner diameter of each mounting hole is larger than that of each external thread pipe, and the other end of each external thread pipe is provided with a second hexagonal pipe. A first clamping ring and a second clamping ring are movably mounted in the mounting hole, a filter membrane is movably mounted between the first clamping ring and the second clamping ring, the cross section of the test tube is T-shaped, a second hexagonal tube is rotatably mounted on the test tube, the cross section of an inner hole of the second hexagonal tube is T-shaped, and the second hexagonal tube is in threaded connection with the first hexagonal tube; according to the utility model, absorbent cotton is replaced by the filter membrane, so that the retention of carbon black in the chromatographic column and the liquidity of liquid after vaporization are ensured, the carbon black is prevented from entering equipment in the testing process, the pressure at the two ends of the chromatographic column is controllable, and the filtering effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a gas chromatography testing device. Background Art

[0002] Gas chromatography can be divided into gas-solid chromatography and gas-liquid chromatography. Gas-solid chromatography refers to a chromatographic separation method in which the mobile phase is gas and the stationary phase is solid matter, such as activated carbon, silica gel, etc. as stationary phase. Gas-liquid chromatography refers to a chromatographic separation method in which the mobile phase is gas and the stationary phase is liquid. For example, by coating a layer of squalane on the inert material diatomaceous earth, it is possible to separate and determine trace impurities such as methane, acetylene, propylene, propane, etc. in pure ethylene.

[0003] Carbon black is needed in the gas chromatography test process. In the prior art, absorbent cotton is used to block both ends of the chromatographic column. The amount of cotton used will affect the pressure at both ends of the chromatographic column. If the amount is too small, the carbon black will detach from the column and enter the equipment. If the amount is too large, the chromatographic column may be blocked. In addition, the amount of cotton used varies from person to person and is difficult to determine uniformly. Therefore, a gas chromatography test device is needed to meet the needs. Utility Model Content

[0004] The purpose of the utility model is to provide a gas chromatography testing device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gas chromatography testing device, comprising a chromatographic column and a test tube, the chromatographic column is composed of a straight tube and a curved tube, one end of the straight tube and the curved tube are connected to a first hexagonal tube, the first hexagonal tube is connected to an externally threaded tube, one end of the externally threaded tube is provided with a mounting hole, the inner diameter of the mounting hole is larger than the inner diameter of the externally threaded tube, a first clamping ring and a second clamping ring are movably installed in the mounting hole, a filter membrane is movably installed between the first clamping ring and the second clamping ring, the cross section of the test tube is T-shaped, a second hexagonal tube is rotatably installed on the test tube, the inner hole cross section of the second hexagonal tube is T-shaped, and the second hexagonal tube is threadedly connected to the first hexagonal tube, and the end of the test tube with a larger outer diameter is in contact with the second clamping ring.

[0006] Preferably, a first sealing ring is provided in the mounting hole, and the first sealing ring is in contact with the first clamping ring.

[0007] Preferably, a first arc groove is provided on one end of the first clamp ring, and a second arc groove is provided on the other end. The specifications of the second arc groove are larger than those of the first arc groove and the second arc groove are communicated with the first arc groove. A socket is provided on the same end of the first arc groove and the second arc groove. A T-shaped shaft is provided on one end of the second clamp ring. The shaft body of the T-shaped shaft with a smaller outer diameter is slidably adapted in the first arc groove, and the shaft body of the T-shaped shaft with a larger outer diameter is slidably adapted in the second arc groove and adapted to the socket.

[0008] Preferably, a mounting groove is provided on one end of the first clamp ring, the aperture of the mounting groove is larger than the inner diameter of the first clamp ring, and the filter membrane is located in the mounting groove.

[0009] Preferably, a second sealing ring is arranged inside the first clamping ring, and the second sealing ring is in contact with the second clamping ring.

[0010] Preferably, a positioning pin is provided on the inner wall of the mounting hole, and positioning grooves are provided on the outer walls of the first clamp ring and the second clamp ring, and the positioning pin is fitted in the positioning groove.

[0011] Preferably, a third sealing ring is provided inside the end of the test tube with a larger outer diameter, and the third sealing ring is in contact with the second clamping ring.

[0012] The beneficial effects of the utility model are:

[0013] The utility model uses a filter membrane instead of absorbent cotton to ensure that carbon black is retained in the chromatographic column and that the liquid is fluid after vaporization, thereby preventing carbon black from entering the device during the test process and making the pressure at both ends of the chromatographic column controllable, thereby improving the filtering effect.

[0014] In the utility model, the filter membrane is clamped and fixed by the first clamp ring and the second clamp ring, so that the filter membrane and the first clamp ring and the second clamp ring can form a whole, thereby making the overall structure of the filter membrane more stable, and the filter membrane can be replaced through the installation and removal structure between the first clamp ring and the second clamp ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a gas chromatography testing device proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of a top-view cross-sectional structure of a first hexagonal tube and a second hexagonal tube connected to a gas chromatography testing device proposed by the utility model;

[0017] Figure 3 This is a schematic diagram of the explosion structure of the first hexagonal tube and the second hexagonal tube connected to the gas chromatography test device proposed by the utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure of a first clamp ring, a filter membrane and a second clamp ring of a gas chromatography testing device proposed by the utility model;

[0019] Figure 5 This is a schematic diagram of the connection structure between the first clamp ring and the filter membrane of a gas chromatography testing device proposed by the utility model;

[0020] Figure 6 This is a schematic diagram of the connection structure between the second arc groove and the first arc groove of a gas chromatography testing device proposed by the utility model;

[0021] Figure 7 The utility model is a schematic diagram of the connection structure between the second clamping ring and the T-shaped shaft of a gas chromatography testing device.

[0022] In the figure: 1, chromatographic column; 2, test tube; 3, straight tube; 4, bent tube; 5, first hexagonal tube; 6, externally threaded tube; 7, mounting hole; 8, first clamp ring; 9, second clamp ring; 10, filter membrane; 11, second hexagonal tube; 12, first sealing ring; 13, first arc groove; 14, second arc groove; 15, jack; 16, T-shaft; 17, mounting groove; 18, second sealing ring; 19, positioning pin; 20, positioning groove; 21, third sealing ring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Reference Figure 1-7 A gas chromatography testing device comprises a chromatographic column 1 and a test tube 2. The chromatographic column 1 is composed of a straight tube 3 and a curved tube 4. One end of the straight tube 3 and the curved tube 4 are both connected with a first hexagonal tube 5, and the first hexagonal tube 5 is both connected with an externally threaded tube 6. A mounting hole 7 is opened in one end of the externally threaded tube 6. The inner diameter of the mounting hole 7 is larger than the inner diameter of the externally threaded tube 6. A first clamping ring 8 and a second clamping ring 9 are movably installed in the mounting hole 7. A filter membrane 10 is movably installed between the first clamping ring 8 and the second clamping ring 9. The cross section of the test tube 2 is T-shaped. A second hexagonal tube 11 is rotatably installed on the test tube 2. The inner hole cross section of the second hexagonal tube 11 is T-shaped and is threadedly connected to the first hexagonal tube 5. The end of the test tube 2 with a larger outer diameter contacts the second clamping ring 9.

[0025] Before the test, use a sieve to screen out carbon black particles with a size between 60 and 80 meshes, remove the residue in the chromatographic column 1, blow and wash the packed column 5-7 times with an ear cleaning bulb to ensure the cleanliness of the column, place the filter membrane 10 between the first clamp ring 8 and the second clamp ring 9, and insert the combination from the external threaded tube 6 at one end of the elbow 4 into the mounting hole 7, screw the second hexagonal tube 11 at the test tube 2 connected to the equipment on the external threaded tube 6, so that one end of the test tube 2 is in contact with the second clamp ring 9 until it is tightened, weigh 0.4g of carbon black, and pour it into the chromatographic column 1 from the end of the straight tube 3, avoiding spillage when pouring and filling evenly Evenly pour, after pouring, insert another group of first clamp ring 8, second clamp ring 9 and filter membrane 10 into the installation hole 7 of the external threaded tube 6 of the straight tube 3, screw the second hexagonal tube 11 on the other group of test tubes 2 connected to the equipment on the external threaded tube 6 until it is tightened. At this time, the connection between the chromatographic column 1 and the equipment is completed, and the equipment is started to perform gas chromatography detection on carbon black. The filter membrane 10 is used to replace the absorbent cotton in the prior art to ensure that the carbon black is retained in the chromatographic column 1 and the fluidity of the liquid after vaporization is guaranteed to prevent the carbon black from entering the equipment during the test process, and the pressure at both ends of the chromatographic column 1 can be controlled to improve the filtering effect.

[0026] Specifically, in this embodiment, a first sealing ring 12 is disposed in the mounting hole 7 , and the first sealing ring 12 is in contact with the first clamping ring 8 , thereby improving the sealing between the mounting hole 7 and the assembly and preventing carbon black from penetrating from the connection.

[0027] Specifically, in the present embodiment, a first arc groove 13 is provided on one end of the first clamp ring 8, and a second arc groove 14 is provided on the other end. The specifications of the second arc groove 14 are larger than those of the first arc groove 13, and the second arc groove 13 is communicated with the first arc groove 13. A socket 15 is provided on the same end of the first arc groove 13 and the second arc groove 14. A T-shaped shaft 16 is provided on one end of the second clamp ring 9. The shaft body of the T-shaped shaft 16 with a smaller outer diameter is slidably adapted in the first arc groove 13, and the shaft body of the T-shaped shaft 16 with a larger outer diameter is slidably adapted in the second arc groove 14, and is adapted to the socket 15.

[0028] Align the T-shaped shaft 16 with the socket 15 and insert it, rotate the second clamp ring 9, so that the T-shaped shaft 16 moves toward the other end of the first arc groove 13 and the second arc groove 14, thereby realizing the merging of the first clamp ring 8 and the second clamp ring 9, thereby improving the structural stability of the filter membrane 10 in the mounting hole 7 and making it easier to embed the filter membrane 10 in the mounting hole 7.

[0029] Specifically, in the present embodiment, a mounting groove 17 is provided on one end of the first clamp ring 8, the aperture of the mounting groove 17 is larger than the inner diameter of the first clamp ring 8, and the filter membrane 10 is located in the mounting groove 17, which provides positioning for the installation of the filter membrane 10 and prevents the position of the filter membrane 10 from being shifted, resulting in a gap at the connection between the first clamp ring 8 and the second clamp ring 9.

[0030] Specifically, in this embodiment, a second sealing ring 18 is provided in the first clamping ring 8, and the second sealing ring 18 is in contact with the second clamping ring 9, thereby improving the sealing between the first clamping ring 8 and the second clamping ring 9 and preventing carbon black from penetrating into the gap between the first clamping ring 8 and the second clamping ring 9.

[0031] Specifically, in this embodiment, a positioning pin 19 is provided on the inner wall of the mounting hole 7, and a positioning groove 20 is provided on the outer wall of the first clamp ring 8 and the second clamp ring 9. The positioning pin 19 is adapted in the positioning groove 20 to limit the rotation of the combination, thereby ensuring the overall stability of the combination.

[0032] Specifically, in this embodiment, a third sealing ring 21 is provided inside the end of the test tube 2 with a larger outer diameter. The third sealing ring 21 contacts the second clamp ring 9, thereby improving the sealing between the test tube 2 and the combination and preventing the liquid at the connection from evaporating and leaking to the outside.

[0033] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A gas chromatography testing device, comprising a chromatographic column (1) and a test tube (2), characterized in that: The chromatographic column (1) is composed of a straight tube (3) and a curved tube (4). One end of the straight tube (3) and the curved tube (4) are both connected to a first hexagonal tube (5). The first hexagonal tube (5) is both connected to an externally threaded tube (6). A mounting hole (7) is provided in one end of the externally threaded tube (6). The inner diameter of the mounting hole (7) is larger than the inner diameter of the externally threaded tube (6). A first clamping ring (8) and a second clamping ring (9) are movably mounted in the mounting hole (7). A filter membrane (10) is movably mounted between the first clamping ring (8) and the second clamping ring (9). The cross section of the test tube (2) is T-shaped. A second hexagonal tube (11) is rotatably mounted on the test tube (2). The inner hole cross section of the second hexagonal tube (11) is T-shaped and is threadedly connected to the first hexagonal tube (5). The end of the test tube (2) with a larger outer diameter is in contact with the second clamping ring (9).

2. A gas chromatography testing device according to claim 1, characterized in that: A first sealing ring (12) is arranged in the mounting hole (7), and the first sealing ring (12) is in contact with the first clamping ring (8).

3. A gas chromatography testing device according to claim 1, characterized in that: A first arc groove (13) is provided on one end of the first clamping ring (8), and a second arc groove (14) is provided on the other end. The second arc groove (14) is larger in size than the first arc groove (13) and is communicated with the first arc groove (13). A plug hole (15) is provided on the same end of the first arc groove (13) and the second arc groove (14). A T-shaped shaft (16) is provided on one end of the second clamping ring (9). The shaft body of the T-shaped shaft (16) with a smaller outer diameter is slidably fitted in the first arc groove (13), and the shaft body of the T-shaped shaft (16) with a larger outer diameter is slidably fitted in the second arc groove (14) and is fitted with the plug hole (15).

4. A gas chromatography testing device according to claim 1, characterized in that: A mounting groove (17) is provided on one end of the first clamping ring (8); the aperture of the mounting groove (17) is larger than the inner diameter of the first clamping ring (8); and the filter membrane (10) is located in the mounting groove (17).

5. A gas chromatography testing device according to claim 1, characterized in that: A second sealing ring (18) is arranged inside the first clamping ring (8), and the second sealing ring (18) is in contact with the second clamping ring (9).

6. A gas chromatography testing device according to claim 1, characterized in that: A positioning pin (19) is provided on the inner wall of the mounting hole (7), and positioning grooves (20) are provided on the outer walls of the first clamping ring (8) and the second clamping ring (9), and the positioning pin (19) is adapted to fit in the positioning grooves (20).

7. A gas chromatography testing device according to claim 1, characterized in that: A third sealing ring (21) is arranged inside the end of the test tube (2) with a larger outer diameter, and the third sealing ring (21) is in contact with the second clamping ring (9).

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