Gas chromatography device

Abstract

The utility model discloses a gas chromatography device which comprises a thermal desorption instrument, a gas chromatograph, a sample container, a carrier gas tank and a three-way valve, and the thermal desorption instrument is provided with a carrier gas inlet and a sample outlet; the gas chromatograph is provided with a sample inlet; the sample container is used for storing liquid samples; a gas outlet of the carrier gas tank is connected with the carrier gas inlet through a gas delivery pipe, and the gas delivery pipe is sequentially provided with a pressure reducing valve and a stop valve in the gas flowing direction; the three-way valve comprises a first inlet, a second inlet and an outlet, the first inlet is connected with the sample outlet through a first output pipe, the second inlet is connected with the sample container through a second output pipe, the second output pipe is provided with a switch valve, and the outlet is connected with the sample inlet through a conveying pipe. The gas chromatography device provided by the embodiment of the utility model can be easily switched between liquid sample treatment and solid sample treatment, so that the sample preparation and detection time is shortened.

Description

Technical Field

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

[0002] Traditional gas chromatographs primarily test liquid solutions, requiring the test solution to be injected into the gas chromatograph's inlet for testing. However, testing solid samples or adsorption tubes containing the analyte requires the addition of a thermal desorber, which heats the sample. This releases volatile components from the fixed sample or adsorbent and injects them into the inlet along with the carrier gas for testing. Because the piping between the thermal desorber and the gas chromatograph is difficult to disassemble, simultaneous testing of liquid and solid samples becomes cumbersome and reduces efficiency. Furthermore, the use of an additional gas chromatograph increases equipment costs. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a gas chromatography device that can easily switch between processing liquid samples and solid samples, thereby shortening the sample preparation and detection time.

[0004] According to the utility model, a gas chromatography device is proposed, including a thermal analyzer, a gas chromatograph, a sample container, a carrier gas tank and a three-way valve, the thermal analyzer has a carrier gas inlet and a sample outlet; the gas chromatograph has a sample inlet; the sample container is used to store liquid samples; the gas outlet of the carrier gas tank is connected to the carrier gas inlet through a gas pipe, and the gas pipe is sequentially provided with a pressure reducing valve and a stop valve along the gas flow direction; the three-way valve includes a first inlet, a second inlet and an outlet, the first inlet is connected to the sample outlet through a first output pipe, the second inlet is connected to the sample container through a second output pipe, the second output pipe is provided with a switch valve, and the outlet is connected to the sample inlet through a delivery pipe.

[0005] The gas chromatography device according to the above embodiment of the utility model has at least the following beneficial effects:

[0006] The gas chromatography apparatus provided by the present invention integrates a thermal desorber, enabling the apparatus to simultaneously process liquid samples and solid samples requiring thermal desorption or samples in adsorption tubes, thereby avoiding the need for frequent instrument changes between different sample types and improving the flexibility of the experimental process. Furthermore, the use of a three-way valve allows users to easily switch between processing liquid and solid samples without the need for complex piping installation and disassembly, greatly simplifying the operating procedures, reducing the possibility of human error, shortening sample preparation and testing time, and reducing equipment costs.

[0007] According to some embodiments of the present invention, the delivery pipe is an electric heating pipe equipped with a pipe sleeve.

[0008] According to some embodiments of the present invention, a purification drying pipe is provided between the pressure reducing valve and the stop valve.

[0009] According to some embodiments of the present invention, a pressure gauge is provided between the stop valve and the thermal analyzer.

[0010] According to some embodiments of the present invention, a connecting plate is further included, and the thermal analyzer and the gas chromatograph are respectively connected to the two sides of the upper end surface of the connecting plate, and both sides of the connecting plate are rotatably connected with a holding ring. One side of the thermal analyzer and the gas chromatograph is installed with a positioning seat, and the positioning seat corresponds to the position of the holding ring one by one. The positioning seat is provided with a card slot, and the holding ring can be stuck in the card slot and fixed by a fixing structure.

[0011] According to some embodiments of the present invention, a threaded hole connected to the slot is provided on the top of the positioning seat, and the fixing structure includes a stud and a nut. The stud is passed through the threaded hole, the bottom of the stud can press the holding ring, and the top of the stud is connected to the nut through a thread.

[0012] According to some embodiments of the present invention, a first magnet is installed at the bottom of the thermal analyzer and the gas chromatograph, and a second magnet is installed at the position of the upper end surface of the connecting plate corresponding to the first magnet.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0015] Figure 1 A gas circuit connection diagram of a gas chromatography device according to some embodiments of the present invention;

[0016] Figure 2 This is a schematic structural diagram of a gas chromatography device according to an embodiment of the present invention;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 This is a schematic diagram of the partial structure of a gas chromatography device according to an embodiment of the present utility model.

[0019] Wherein, the reference numerals:

[0020] Thermal desorber 100; first output tube 110;

[0021] Gas chromatograph 200; delivery pipe 210;

[0022] Sample container 300; second output tube 310; switch valve 320;

[0023] Gas carrier tank 400; gas delivery pipe 410; pressure reducing valve 420; purification drying pipe 430; stop valve 440; pressure gauge 450;

[0024] Three-way valve 500;

[0025] Connecting plate 600 ; holding ring 610 ; positioning seat 620 ; slot 621 ; stud 630 ; nut 640 ; first magnet 650 ; second magnet 660 . DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise expressly defined, terms such as "set," "install," and "connect" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the present utility model based on the specific content of the technical solution. In the description of this utility model, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of these terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of these terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0030] Reference Figure 1 According to the utility model, a gas chromatography device includes a thermal desorber 100, a gas chromatograph 200, a sample container 300, a carrier gas tank 400 and a three-way valve 500. The thermal desorber 100 has a carrier gas inlet and a sample outlet; the gas chromatograph 200 has a sample inlet; the sample container 300 is used to store liquid samples; the gas outlet of the carrier gas tank 400 is connected to the carrier gas inlet through a gas pipe 410, and the gas pipe 410 is sequentially provided with a pressure reducing valve 420 and a stop valve 440 along the gas flow direction; the three-way valve 500 includes a first inlet, a second inlet and an outlet, the first inlet is connected to the sample outlet through a first output pipe 110, the second inlet is connected to the sample container 300 through a second output pipe 310, the second output pipe 310 is provided with a switch valve 320, and the outlet is connected to the sample inlet through a delivery pipe 210.

[0031] Specifically, the gas chromatography apparatus provided by the present embodiment integrates a thermal desorber 100, enabling the apparatus to simultaneously process liquid samples and solid samples requiring thermal desorption or samples in adsorption tubes. This eliminates the need for frequent instrument changes between different sample types and improves the flexibility of the experimental process. Furthermore, the use of a three-way valve 500 allows users to easily switch between processing liquid and solid samples without the need for complex piping installation and disassembly, greatly simplifying the operating procedures, reducing the possibility of human error, shortening sample preparation and testing time, and reducing equipment costs.

[0032] It should be noted that the working principle of the thermal desorber 100 is to release volatile components from a solid sample or adsorbent by heating, and purge them with a carrier gas so that the volatile components enter the gas chromatograph 200 with the carrier gas for analysis and measurement.

[0033] Furthermore, according to some embodiments of the present invention, the delivery tube 210 is an electric heating tube equipped with a tube sleeve. It is understandable that condensation may occur in the process of volatile components flowing with the carrier gas, affecting the accuracy of the analysis of the gas chromatograph 200. Therefore, the electric heating tube can ensure that the gas enters the gas chromatograph 200 at a suitable temperature for analysis and measurement, thereby improving the accuracy. On the other hand, the liquid sample may remain in the delivery tube 210 during the flow process. The electric heating tube can heat the residual liquid sample to evaporate it into gas and flow it into the gas chromatograph 200 for discharge. It should be noted that the gas chromatograph 200 is mainly used to analyze gaseous or volatile liquid samples. The gas chromatograph 200 is equipped with an exhaust system to discharge gas or liquid.

[0034] Further, refer to Figure 1 According to some embodiments of the present invention, a purification drying tube 430 is provided between the pressure reducing valve 420 and the stop valve 440 to purify the carrier gas, and a pressure gauge 450 is provided between the stop valve 440 and the thermal analyzer 100 to monitor the pressure in real time.

[0035] Specifically, in an embodiment of the present invention, when a solid sample needs to be detected, the first inlet and outlet of the three-way valve 500 are connected by controlling the solenoid valve, the user opens the stop valve 440 of the gas supply pipe 410, and the carrier gas is output from the carrier gas tank 400. After passing through the pressure reducing valve 420 and reducing the pressure to the required pressure, the carrier gas is purified by the purification drying pipe 430, and then flows into the thermal analyzer 100 through the carrier gas inlet at a stable pressure and a constant speed, thereby mixing with the volatile components and bringing the volatile components out from the sample outlet, and then flows through the first output pipe 110, the first inlet, the outlet and the delivery pipe 210 in sequence, and finally flows into the gas chromatograph 200 through the sample inlet for analysis and measurement. When a liquid sample needs to be tested, the second inlet and outlet of the three-way valve 500 are connected by controlling the solenoid valve, and the user opens the switch valve 320 of the second output pipe 310. The liquid sample flows out of the sample container 300 and passes through the second output pipe 310, the second inlet, the outlet and the delivery pipe 210 in sequence, and finally flows into the gas chromatograph 200 through the sample inlet for analysis and measurement.

[0036] Further, refer to Figures 2 to 4 According to some embodiments of the present invention, the gas chromatography device further includes a connecting plate 600, the thermal analyzer 100 and the gas chromatograph 200 are respectively connected to the two sides of the upper end surface of the connecting plate 600, and both sides of the connecting plate 600 are rotatably connected with a holding ring 610, and one side of the thermal analyzer 100 and the gas chromatograph 200 are both installed with a positioning seat 620, and the position of the positioning seat 620 corresponds one-to-one to the position of the holding ring 610, and the positioning seat 620 is provided with a card slot 621, and the holding ring 610 can be snapped into the card slot 621 and fixed by a fixing structure.

[0037] It is understandable that because the thermal desorber 100 and the gas chromatograph 200 are two different instruments and need to be connected to each other via wires, they are prone to shifting during use or carrying, causing operational inconvenience. Therefore, the embodiment of the utility model uses a connecting plate 600 to position the thermal desorber 100 and the gas chromatograph 200 together, allowing the thermal desorber 100 and the gas chromatograph 200 to be carried or used together, avoiding the occurrence of shifting. At the same time, the connecting plate 600 is easy to assemble and disassemble, facilitating practical use.

[0038] Further, refer to Figures 2 to 4 According to some embodiments of the present invention, a threaded hole connecting the card slot 621 is provided at the top of the positioning seat 620, and the fixing structure includes a stud 630 and a nut 640. The stud 630 is passed through the threaded hole, and the bottom of the stud 630 can press the holding ring 610. The top of the stud 630 is connected to the nut 640 through a thread.

[0039] Specifically, during actual use, the thermal analyzer 100 and the gas chromatograph 200 are first placed against each other on the connecting plate 600, and the rings 610 on both sides of the connecting plate 600 are respectively rotated to the positioning seats 620 on the sides of the thermal analyzer 100 and the gas chromatograph 200, and are snapped into the slots 621, and then the stud 630 is rotated so that the end of the stud 630 presses the ring 610 in the slot 621 to further fix the ring 610, and finally the stud 630 is fixed by the nut 640.

[0040] Further, refer to Figure 2 According to some embodiments of the present invention, a first magnet 650 is installed at the bottom of the thermal analyzer 100 and the gas chromatograph 200, and a second magnet 660 is installed on the upper end surface of the connecting plate 600 at a position corresponding to the first magnet 650. The cooperation between the first magnet 650 and the second magnet 660 can achieve preliminary positioning of the thermal analyzer 100 and the gas chromatograph 200, so that the holding ring 610 and the card slot 621 are correctly aligned.

[0041] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A gas chromatography device, characterized in that include: A thermal desorber having a carrier gas inlet and a sample outlet; a gas chromatograph having a sample inlet; Sample container, used to store liquid samples; A carrier gas tank, wherein the gas outlet of the carrier gas tank is connected to the carrier gas inlet via a gas pipe, and the gas pipe is sequentially provided with a pressure reducing valve and a stop valve along the gas flow direction; The three-way valve includes a first inlet, a second inlet and an outlet. The first inlet is connected to the sample outlet through a first output tube, the second inlet is connected to the sample container through a second output tube, the second output tube is provided with a switch valve, and the outlet is connected to the sample inlet through a delivery tube.

2. The gas chromatography device according to claim 1, characterized in that The delivery pipe is an electric heating pipe equipped with a pipe sleeve.

3. The gas chromatography apparatus according to claim 1, characterized in that A purification drying pipe is provided between the pressure reducing valve and the stop valve.

4. The gas chromatography apparatus according to claim 1, characterized in that A pressure gauge is provided between the stop valve and the thermal analyzer.

5. The gas chromatography apparatus according to claim 1, characterized in that It also includes a connecting plate, the thermal analyzer and the gas chromatograph are respectively connected to the two sides of the upper end surface of the connecting plate, and both sides of the connecting plate are rotatably connected with a holding ring. One side of the thermal analyzer and the gas chromatograph is installed with a positioning seat, the positioning seat corresponds to the position of the holding ring one by one, and the positioning seat is provided with a card slot, and the holding ring can be inserted into the card slot and fixed by a fixing structure.

6. The gas chromatography apparatus according to claim 5, characterized in that A threaded hole connected to the slot is provided on the top of the positioning seat, and the fixing structure includes a stud and a nut. The stud is passed through the threaded hole, the bottom of the stud can press the holding ring, and the top of the stud is connected to the nut through a thread.

7. The gas chromatography apparatus according to claim 5, characterized in that A first magnet is installed at the bottom of each of the thermal analyzer and the gas chromatograph, and a second magnet is installed at a position on the upper end surface of the connecting plate corresponding to the first magnet.

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