Sample introduction device of gas chromatograph

Abstract

The utility model discloses a gas chromatograph's sample introduction device, including motor cover, grab handle, feed cylinder, material passing cylinder, heating cylinder, material adding cylinder, feed needle, the bottom of motor cover is movably provided with grab handle, the bottom of grab handle is fixedly provided with feed cylinder, the bottom of feed cylinder is fixedly provided with the material passing cylinder, the material passing cylinder is fixedly provided with the heating cylinder, the material passing cylinder is fixedly provided with the heating cylinder, and the material passing cylinder is fixedly provided with the material adding cylinder. The heating cylinder is fixedly arranged at the bottom of the material passing cylinder, the material adding cylinder is fixedly arranged at the bottom of the heating cylinder, the feeding needle is fixedly arranged at the bottom of the material adding cylinder, the motor cover is in spiral connection with the grab handle, the key is fixedly arranged at the top of the motor cover, and the grab handle is in a shape of a rectangle with two arc-shaped sides in a top view. The feeding cylinder is hollow, a first filtering layer is fixedly arranged in the middle of the feeding cylinder, a second filtering block is fixedly arranged at the bottom of the feeding cylinder and located at the bottom of the feeding cylinder and the top of the material passing cylinder, the diameter of the second filtering block is smaller than that of the feeding cylinder and that of the heating cylinder, and the device is simple in structure, convenient to operate and easy to maintain and clean.

Description

Technical Field

[0001] The utility model relates to the field of gas chromatograph feeding, in particular to a gas chromatograph sampling device. Background Art

[0002] Gas chromatograph is a commonly used analytical instrument, widely used in the analysis of gas, liquid and solid samples. The injection device is an important part of the gas chromatograph, and its performance directly affects the accuracy and stability of the analysis results. The existing injection device has problems such as complex structure and inconvenient operation, which affects the accuracy and stability of the injection. Therefore, it is necessary to design a gas chromatograph injection device with simple structure and easy use. In gas chromatography analysis, the common sample form during injection is liquid or gas. After the actual sample (such as vegetables) undergoes pre-treatment steps such as solvent extraction, filtration, extraction, concentration and constant volume, it becomes a component in the solution and becomes a liquid sample; volatile components in water, soil and solid waste (after treatment), atmosphere and factory exhaust, natural gas and other chemical gases are used as gas samples. Different sample forms and properties will lead to different ways of introducing them into the injection port, giving rise to a variety of sample introduction devices. Common sample introduction devices include microinjectors and gas-tight injection needles, multi-way valves, thermal desorption, etc. In gas chromatographs, commonly used carrier gases are hydrogen, nitrogen and argon. The purity is required to be above 99.999%, with good chemical inertness and no reaction with the components to be measured. In addition to considering the separation effect of the components to be measured, the selection of carrier gas also requires consideration of the detector sensitivity of the components to be measured under different carrier gas conditions. The injection system of the gas chromatograph mainly includes two parts: the injector and the vaporization chamber. Different injectors are used according to the different phases of the components to be measured. The injection operation of liquid samples generally uses a flat-head micro-injector; the injection of gas samples often uses the chromatograph's own rotary six-way valve or pointed micro-injector; solid samples are generally first dissolved in an appropriate reagent and then injected in liquid form with a micro-syringe.

[0003] However, there are few gas chromatograph sampling devices on the market, or the existing related technologies have certain defects, such as the inability to effectively filter the feed, the inability to heat the sample as required, and the inability to add material during the sampling process. Utility Model Content

[0004] The purpose of the utility model is to overcome the above technical defects and provide a sampling device for a gas chromatograph to solve the problems of being unable to effectively filter the feed, being unable to heat the sample as required, and being unable to add material during the sampling process.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is: a sampling device of a gas chromatograph, comprising a motor cover, a handle, a feed barrel, a passing barrel, a heating barrel, a adding barrel, and a feed needle. The motor cover is movably provided with a handle at the bottom, the handle is fixedly provided with a feed barrel at the bottom, the feed barrel is fixedly provided with a passing barrel at the bottom, the passing barrel is fixedly provided with a heating barrel at the bottom, the heating barrel is fixedly provided with a adding barrel at the bottom, and the adding barrel is fixedly provided with a feed needle at the bottom.

[0006] Furthermore, the motor cover is screwed to the handle, a button is fixedly provided on the top of the motor cover, and the handle is a rectangle with arcs on both sides in a top view.

[0007] Furthermore, the feed barrel is hollow, a first filter layer is fixedly arranged in the middle, a second filter block is fixedly arranged at the bottom of the feed barrel, and the second filter block is located at the bottom of the feed barrel and the top of the feed barrel.

[0008] Furthermore, the material passing cylinder is hollow, and its diameter is smaller than that of the feeding cylinder and the heating cylinder. The heating cylinder is hollow, and infrared heating elements are fixedly arranged around the cylinder, which are controlled by a motor cover.

[0009] Furthermore, a limiting cylinder is sleeved inside the hollow interior of the feeding cylinder, and feeding holes are fixedly opened at corresponding positions of the feeding cylinder and the limiting cylinder.

[0010] Furthermore, the bottom of the feed needle is conical.

[0011] Compared with the prior art, the utility model has the following advantages: High-efficiency separation: Due to the adoption of gas chromatography technology, the sample introduction device can efficiently separate complex samples and is particularly suitable for the analysis of various components in a mixture.

[0012] Heatable: Equipped with a heating cartridge, the sample can be heated if necessary.

[0013] Rapid analysis: The rapid analysis capability of the device helps to shorten sample analysis time and improve work efficiency.

[0014] Wide range of applications: The device is suitable for separation and analysis of various types of samples, such as gas, liquid, solid, etc., which expands its scope of use.

[0015] Automated operation: Remote control through the motor cover can achieve automated or manual operation, improving the convenience of operation.

[0016] Simple structure: The device has a simple structure, is easy to operate, maintain and clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1The utility model is a schematic diagram of the overall structure of a sample injection device of a gas chromatograph.

[0018] Figure 2 The utility model is a schematic diagram of the internal structure of a feed cylinder of a sample injection device of a gas chromatograph.

[0019] Figure 3 The utility model is a schematic diagram of the structure of a material adding cylinder of a sample feeding device of a gas chromatograph.

[0020] Figure 4 The utility model is a schematic diagram of the structure of a limiting cylinder of a sample injection device of a gas chromatograph.

[0021] Figure 5 The utility model is a schematic diagram of the structure of a sample injection device of a gas chromatograph viewed from above.

[0022] Figure 6 The utility model is a schematic diagram of the top view of the structure of a sample injection device of a gas chromatograph. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, "multiple" means at least 2.

[0027] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Example:

[0029] A sampling device for a gas chromatograph comprises a motor cover 1, a handle 2, a feed barrel 3, a passing barrel 4, a heating barrel 5, an adding barrel 6 and a feeding needle 7. The motor cover 1 has a handle 2 movably arranged at the bottom, the handle 2 has a feed barrel 3 fixedly arranged at the bottom, the feed barrel 3 has a passing barrel 4 fixedly arranged at the bottom, the passing barrel 4 has a heating barrel 5 fixedly arranged at the bottom, the heating barrel 5 has an adding barrel 6 fixedly arranged at the bottom, and the adding barrel 6 has a feeding needle 7 fixedly arranged at the bottom.

[0030] The motor cover 1 is screwed to the handle 2. A button 101 is fixedly disposed on the top of the motor cover 1. The handle 2 is a rectangular shape with arcs on both sides in a top view.

[0031] The feed barrel 3 is hollow, and a first filter layer 301 is fixedly disposed in the middle position. A second filter block 302 is fixedly disposed at the bottom of the feed barrel 3 . The second filter block 302 is located at the bottom of the feed barrel 3 and the top of the feed barrel 4 .

[0032] The material passing cylinder 4 is hollow, and its diameter is smaller than the feeding cylinder 3 and the heating cylinder 5. The heating cylinder 5 is hollow, and infrared heating elements are fixedly arranged around the cylinder, which are controlled by the motor cover.

[0033] The hollow interior of the material adding cylinder 6 is sleeved with a limiting cylinder 601 , and corresponding positions of the material adding cylinder 6 and the limiting cylinder 601 are fixedly provided with material adding holes 602 .

[0034] The bottom of the feed needle 7 is conical.

[0035] In the specific implementation of the utility model, the connection and setting are as follows: the motor cover 1 and the handle 2 are fixed by a screw connection to ensure their stability. The button 101 is used to start or close the sample feeding device. The feed barrel 3 is provided with two layers of filtration, the first filter layer 301 and the second filter block 302, which are used for preliminary filtering of impurities.

[0036] Sample addition and heating: Open the motor cover 1 and place the sample to be analyzed into the feed tube 3. The heating tube 5 is started by the button 101 on the motor cover. The infrared heating element provided in the heating tube will heat the sample to ensure that the sample is at a suitable temperature for vaporization.

[0037] Feeding and filtering: After the sample is heated to a vaporized state in the heating cylinder 5 , the vaporized sample will be transferred to the heating cylinder 5 through the feeding cylinder 4 . During the feeding process, the second filter block 302 will further filter out impurities in the sample.

[0038] Feeding and injection: The vaporized sample then enters the feeding tube 6, which is sleeved with a limiting tube 601 to ensure the stability of the sample flow. In the feeding tube 6, the sample flows into the feeding needle 7 through the feeding hole 602. The bottom of the feeding needle 7 is designed to be conical, which helps to more smoothly inject the sample into the chromatographic column for subsequent analysis.

[0039] Operation control: The entire injection process can be remotely controlled through the motor cover to achieve automated or manual operation.

[0040] Through the above steps, the sampling device of the gas chromatograph can efficiently and accurately complete the sample injection work, providing a reliable premise for subsequent gas chromatography analysis.

[0041] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A sample injection device for a gas chromatograph, comprising a motor cover (1), a handle (2), a feed cylinder (3), a feed cylinder (4), a heating cylinder (5), a feed cylinder (6), and a feed needle (7), characterized in that: The motor cover (1) is provided with a handle (2) movably at the bottom, a feed barrel (3) is fixedly provided at the bottom of the handle (2), a feeding barrel (4) is fixedly provided at the bottom of the feed barrel (3), a heating barrel (5) is fixedly provided at the bottom of the feeding barrel (4), a feeding barrel (6) is fixedly provided at the bottom of the heating barrel (5), and a feeding needle (7) is fixedly provided at the bottom of the feeding barrel (6).

2. A gas chromatograph sample injection device according to claim 1, characterized in that: The motor cover (1) is screw-connected to the handle (2); a button (101) is fixedly arranged on the top of the motor cover (1); and the handle (2) is a rectangular shape with arcs on both sides in a top view.

3. A gas chromatograph sample injection device according to claim 1, characterized in that: The feed barrel (3) is hollow, and a first filter layer (301) is fixedly arranged in the middle position. A second filter block (302) is fixedly arranged at the bottom of the feed barrel (3). The second filter block (302) is located at the bottom of the feed barrel (3) and the top of the feed barrel (4).

4. A gas chromatograph sample injection device according to claim 1, characterized in that: The material passing cylinder (4) is hollow, and its diameter is smaller than that of the material feeding cylinder (3) and the heating cylinder (5). The heating cylinder (5) is hollow, and infrared heating elements are fixedly arranged around the cylinder, which are controlled by the motor cover.

5. The sampling device of a gas chromatograph according to claim 1, characterized in that: A limiting cylinder (601) is sleeved in the hollow interior of the material adding cylinder (6), and material adding holes (602) are fixedly provided at corresponding positions of the material adding cylinder (6) and the limiting cylinder (601).

6. A gas chromatograph sample injection device according to claim 1, characterized in that: The bottom of the feed needle (7) is conical.

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