Gas chromatograph

Abstract

A gas chromatograph comprises a shell, a carrier gas system, a sample introduction system, a detector, a chromatographic column system, a detection processing control system and an operation display system, the carrier gas system, the sample introduction system and the detector are respectively arranged at the top end of the shell, the chromatographic column system is located in the shell, the detection processing control system is arranged at the side end of the shell, and the operation display system is arranged on the shell. The operation display system is arranged on the surface of the shell, the carrier gas system is connected with the sample introduction system, the chromatographic column system is connected with the detector, the detection processing control system is connected with the carrier gas system, the sample introduction system and the detector, and the operation display system is connected with the detection processing control system. The chromatographic column system comprises a first chromatographic column, a second chromatographic column and a two-way joint. Compared with the prior art, a traditional chromatographic column is divided into two independent individuals, so that more convenient and flexible replacement is realized; and the cost is reduced, and the device can be continuously used only by replacing the easily polluted chromatographic column with the distance of 1 meter.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection technical field, concretely relates to a gas chromatograph. BACKGROUND

[0002] In gas chromatographic analysis, traditional chromatographic columns usually use fixed length and structure for sample separation. However, this design has some defects in practical application. First, traditional chromatographic columns are easily contaminated during use, especially when dealing with complex samples, contamination can lead to decreased separation efficiency and inaccurate analysis results. Second, the replacement process of chromatographic columns is cumbersome, and the whole column needs to be replaced, which not only wastes time but also increases operating costs. In addition, the contamination progress of each section of the chromatographic column is different, and the local contamination requires the replacement of the whole chromatographic column. This is obviously very unscientific and wastes time and cost.

[0003] In order to solve the above problems, we have made a series of improvements. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a gas chromatograph to overcome the above-mentioned shortcomings and deficiencies existing in the prior art.

[0005] A gas chromatograph, comprising: a housing, a carrier gas system, a sample injection system, a detector, a chromatographic column system, a detection and processing control system, and an operation display system, the carrier gas system, the sample injection system, and the detector are respectively arranged at the top end of the housing, the chromatographic column system is located in the housing, the detection and processing control system is arranged at the side end of the housing, the operation display system is arranged on the surface of the housing, the carrier gas system is connected with the sample injection system, the chromatographic column system is connected with the detector, the detection and processing control system is connected with the carrier gas system, the sample injection system, and the detector, and the operation display system is connected with the detection and processing control system.

[0006] The chromatographic column system comprises: a first chromatographic column, a second chromatographic column, and a two-way connector, the length of the second chromatographic column is 1M, the first chromatographic column is connected with the detector, and the first chromatographic column is connected with the second chromatographic column through the two-way connector.

[0007] Further, a pliable metal sealing gasket is arranged in the two-way connector.

[0008] The utility model has the advantages of:

[0009] Compared with the prior art, the utility model divides the traditional chromatographic column into two independent individuals, realizes more convenient and flexible replacement, reduces costs, and only needs to replace the 1-meter chromatographic column that is easily contaminated to continue using. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1It is a structure schematic view of the utility model.

[0011] Figure 2 It is a structure schematic view of the chromatographic column system.

[0012] Reference signs:

[0013] The shell 100, the carrier gas system 200, the sample introduction system 300, the detector 400, the chromatographic column system 500, the first chromatographic column 510, the second chromatographic column 520 and the two-way joint 530.

[0014] The detection processing control system 600 and the operation display system 700. DETAILED DESCRIPTION

[0015] The utility model will be further explained in connection with specific embodiments. It should be understood that the following embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model.

[0016] Example 1

[0017] Figure 1 It is a structure schematic view of the utility model. Figure 2 It is a structure schematic view of the chromatographic column system.

[0018] As Figure 1 shown, a kind of gas chromatograph, comprising: shell 100, carrier gas system 200, sample introduction system 300, detector 400, chromatographic column system 500, detection processing control system 600 and operation display system 700, carrier gas system 200, sample introduction system 300 and detector 400 are respectively arranged at the top of shell 100, chromatographic column system 500 is located in shell 100, detection processing control system 600 is arranged at the side end of shell 100, operation display system 700 is arranged on the surface of shell 100, carrier gas system 200 is connected with sample introduction system 300, chromatographic column system 500 is connected with detector 400, detection processing control system 600 is connected with carrier gas system 200, sample introduction system 300 and detector 400, operation display system 700 is connected with detection processing control system 600.

[0019] As Figure 2 shown, wherein, chromatographic column system 500 includes: first chromatographic column 510, second chromatographic column 520 and two-way joint 530, the length of second chromatographic column 520 is 1M, first chromatographic column 510 is connected with detector 400, first chromatographic column 510 is connected with second chromatographic column 520 by two-way joint 530.

[0020] Two-way joint 530 is equipped with plastic metal sealing washer.

[0021] The steps of using the gas chromatograph are as follows:

[0022] Before starting the device, check the gas source of the carrier gas system 200 to ensure that the gas purity meets the requirements. Start the detection process control system 600, set the carrier gas flow, column temperature and detector parameters through the operation display system 700, and set the analysis program, including the temperature rising program and the detection time.

[0023] Inject the sample using the sample injection system 300, and ensure that the sample amount and concentration meet the experimental requirements. Start the analysis program, and the carrier gas system 200 drives the sample through the chromatographic column system 500 for separation. The separated sample enters the detector 400 for detection, and the detection process control system 600 collects and processes data in real time.

[0024] View the real-time analysis results by operating the display system 700, and the detection process control system 600 provides detailed analysis reports and stores or exports the results.

[0025] Basically, the utility model does not produce any change in use, except that the chromatographic column system 500 is the original traditional structure. And no change is what we need.

[0026] In this embodiment, we reform the 15-meter chromatographic column. The purpose of the utility model is to change the traditional integrated 15-meter chromatographic column into a 14M first chromatographic column 510 and a 1M second chromatographic column 520. As mentioned in the background art, the chromatographic column is very easy to be contaminated. Once contaminated, in order to ensure the accuracy of detection, it needs to be replaced. And the chromatographic column is integrated, so it needs to be replaced together. But in fact, most of the parts are not contaminated and do not need to be replaced.

[0027] So we have several appeals in our research and development: 1. Only the part that is easy to be contaminated is modularized, so that the replacement efficiency is improved and the cost is reduced. 2. Find out what this part is. 3. It will not affect the use of other accessories. 4. The subsequent problems after modularization. 5. Will the final detection result change.

[0028] The first point is the scheme itself. We decided to change the integrated 15-meter chromatographic column into two parts, one part that is easy to be contaminated and one part that is not easy to be contaminated, and they are independent of each other, while being connected in some way.

[0029] The second point is why it is 1 meter and 14 meters. First of all, the ultimate purpose of cutting is to facilitate replacement. It is more economical. On the basis of the above, based on the RT retention time, it is considered that the cutting method does not affect the retention time of all compounds. The most contaminated position. After considering, we choose to cut at 1 meter, separate the traditional integrated type.

[0030] Third, it will not affect the use of other accessories. In this way, there is no additional new parts, so it will not affect the use of other accessories.

[0031] Fourth, the negative impact of the improvement. Since the cutting, we have a variety of considerations on the choice of connecting pieces. The embodiment adopts Agilent Ultimate two-way connector tool, which has a metal sealing washer itself, which can effectively play the role of connection and sealing.

[0032] On the other hand, the possible risks include: loss of connection points: each connection point can introduce additional eddy current and dead volume, affecting the separation efficiency. Leakage risk: multiple joints can increase the risk of system leakage. Complexity: increase the complexity of the system, which may require more frequent maintenance. Among them, the first two problems need to be verified by data experiments. And the last complexity problem, on the contrary, if the second chromatographic column 520 does not appear chromatographic column loss or pollution also need to be replaced frequently, and because of this design, it improves its durability and anti-pollution ability, but reduces the disassembly of the detection port, reduces the number of disassembly.

[0033] Fifth, the extension of the fourth point, will such a design affect the data due to the instability of the improvement? As shown below, we use a chromatograph without modification and a modified chromatograph to detect the same sample, and after detection, we find that the results before and after improvement are almost the same, which shows that the modification does not affect the normal use of the chromatograph.

[0034] Original detection:

[0035]

[0036]

[0037] Improved detection:

[0038]

[0039]

[0040] Compared with the traditional technology, the traditional chromatographic column is divided into two independent individuals, which realizes more convenient and flexible replacement; reduces the cost, only needs to replace the 1 meter distance chromatographic column which is easy to be polluted to continue to use.

[0041] The specific embodiments of the utility model are described above, but the utility model is not limited to this, as long as it does not deviate from the purpose of the utility model, the utility model can also have various changes.

Claims

1. A gas chromatograph characterized by, It includes: The shell (100), carrier gas system (200), sample introduction system (300), detector (400), chromatographic column system (500), detection processing control system (600) and operation display system (700), the carrier gas system (200), sample introduction system (300) and detector (400) are respectively arranged at the top end of the shell (100), the chromatographic column system (500) is located in the shell (100), the detection processing control system (600) is arranged at the side end of the shell (100), the operation display system (700) is arranged on the surface of the shell (100), the carrier gas system (200) is connected with the sample introduction system (300), the chromatographic column system (500) is connected with the detector (400), the detection processing control system (600) is connected with the carrier gas system (200), sample introduction system (300) and detector (400), the operation display system (700) is connected with the detection processing control system (600); Wherein, the chromatographic column system (500) includes: first chromatographic column (510), second chromatographic column (520) and two-way connector (530), the length of the second chromatographic column (520) is 1M, the first chromatographic column (510) is connected with the detector (400), the first chromatographic column (510) is connected with the second chromatographic column (520) through the two-way connector (530).

2. A gas chromatograph as defined in claim 1, wherein The two-way connector (530) is provided with a plastic metal sealing washer.

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