Molecular sieve for gas chromatograph

Abstract

This utility model discloses a molecular sieve for a gas chromatograph, belonging to the field of gas chromatograph components. It includes a gas chromatograph body, an external gas chromatograph protective cabinet, and a molecular sieve container for holding molecular sieve material on the side of the protective cabinet. Three hollow columns are welded to the inner wall of the molecular sieve container, each containing a spring. One end of each spring is connected to a movable column, and the end of the movable column away from the spring is connected to a second support net. A first support net is installed inside the molecular sieve container. A feed pipe is connected to the outer periphery of the molecular sieve container, and a sealing cap is installed at the end of the feed pipe away from the molecular sieve container. A guide column is connected to the inner wall of the molecular sieve container. This gas chromatograph uses a molecular sieve to enhance the extrusion pressure of the molecular sieve material particles, reducing gas flow non-uniformity, minimizing the risk of damage to the originally designed molecular sieve layer structure, and improving efficiency and performance.

Description

Technical Field

[0001] This utility model belongs to the field of chromatograph components, and in particular a molecular sieve for gas chromatographs. Background Technology

[0002] In gas chromatography analysis, the purity of the gas sample is crucial to the accuracy of the analytical results. However, the gas sample to be analyzed may contain various impurities, such as water vapor, small molecule organic compounds, acidic or basic substances, etc. These impurities can adversely affect the performance of the chromatographic column and the sensitivity of the detector, thus affecting the accuracy of the analytical results. Traditional molecular sieves used in gas chromatographs can meet basic sieving requirements, but the compression capacity of molecular sieves in gas chromatographs is weak, increasing the non-uniformity of gas flow, increasing the risk of damage to the originally designed molecular sieve layer structure, and reducing efficiency and performance.

[0003] A search of Chinese patent documents (authorization announcement number CN222056796U) reveals that this utility model relates to the technical field of molecular sieves, and particularly to molecular sieve mechanisms. The technical solution includes a fixed box, a molecular sieve filter box body, and a storage box. A sealing cover is hinged to the upper surface of the molecular sieve filter box body. An exhaust pipe is connected to the upper surface of the sealing cover, and a handle is welded to the upper surface of the sealing cover. An air inlet pipe is connected to one outer end face of the molecular sieve filter box body, and an air inlet valve is threaded to the outer surface of the air inlet pipe. A material handling door is hinged to the lower surface of the molecular sieve filter box body, and a handle is welded to the lower surface of the material handling door. A support leg is welded to the lower surface of the molecular sieve filter box body, and a partition is welded to the inner wall of the molecular sieve filter box body. A storage box is slidably connected to the upper surface of the partition, and a fixed box is slidably connected to the upper surface of the storage box. Both the fixed box and the storage box have lids threaded to their inner walls, and the upper surface of the lid has a groove. This invention facilitates the replacement of molecular sieves, which can meet basic sieving requirements, but have weak compaction capacity, increased gas flow non-uniformity, increased risk of damage to the originally designed molecular sieve layer structure, and decreased efficiency and performance. Utility Model Content

[0004] The purpose of this invention is to provide a molecular sieve for gas chromatographs to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a molecular sieve for a gas chromatograph, comprising a gas chromatograph body, a gas chromatograph protective cabinet connected to the outside of the gas chromatograph body, a molecular sieve bucket for holding molecular sieve material disposed on the side of the gas chromatograph protective cabinet, three hollow columns welded to the inner wall of the molecular sieve bucket, each of the three hollow columns having a spring inside, one end of the spring connected to a movable column, the end of the movable column away from the spring connected to a second support net, a first support net installed inside the molecular sieve bucket, a feed pipe connected to the outer periphery of the molecular sieve bucket, a sealing cap installed at the end of the feed pipe away from the molecular sieve bucket, a guide column connected to the inner wall of the molecular sieve bucket, and an arc-shaped fixing plate installed on the outside of the molecular sieve bucket.

[0006] Preferably, one end of the molecular sieve barrel is connected to a gas diffusion barrel, the gas diffusion barrel is provided with a chute, and a rotating frame is rotatably connected inside the chute.

[0007] Preferably, the rotating frame is connected to a plurality of irregularly shaped plates on its side, and the ends of the plurality of irregularly shaped plates are welded with connecting columns. The connecting columns are provided with tapered threaded vent holes, and the end of the gas diffusion barrel away from the molecular sieve barrel is connected to a sample inlet tube.

[0008] Preferably, the other end of the molecular sieve barrel is connected to a filter barrel, and a filter plate frame is welded inside the filter barrel, with a filter plate disposed inside the filter plate frame.

[0009] Preferably, a fan frame is welded to the side of the filter plate frame, and an air inlet fan is installed on the side of the fan frame away from the filter plate frame.

[0010] Preferably, a sample inlet hood is rotatably connected to the side of the filter barrel, and an external sample inlet pipe is connected to the end of the sample inlet hood away from the filter barrel.

[0011] Preferably, the gas chromatograph protection cabinet is equipped with a cabinet door on its side, and the sample inlet of the gas chromatograph body is connected to a connecting tube.

[0012] Compared with the prior art, the technical effects and advantages of this utility model are as follows:

[0013] This gas chromatograph uses a molecular sieve. Thanks to the structure of the molecular sieve barrel, a spring continuously exerts pressure on the moving column. This pressure compresses the molecular sieve material particles between the first and second support meshes, adapting to the compressive force and ensuring proper spacing between the particles. Compared to traditional gas chromatographs with weaker compressive strength, this structure enhances the compressive force on the molecular sieve particles, reduces gas flow non-uniformity, minimizes the risk of damage to the originally designed molecular sieve layer structure, and improves efficiency and performance.

[0014] This gas chromatograph uses a molecular sieve. Thanks to the structure of the gas diffusion chamber, the sieved gas enters the gas diffusion chamber through the second support mesh. Due to the structure of the shaped plate and the conical threaded vent, the gas blows the shaped plate, causing it to rotate. This eliminates local turbulence caused by uneven adsorption inside the molecular sieve or during gas flow, allowing the gas to flow out of the device in a more stable state and enter the subsequent components of the gas chromatograph. This ensures the stability and uniformity of gas flow throughout the gas chromatography system, avoiding interference with subsequent detection and analysis. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the molecular sieve barrel and gas diffusion barrel of this utility model;

[0019] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle.

[0020] Explanation of reference numerals in the attached figures:

[0021] In the diagram: 1. Gas chromatograph protective cabinet; 101. Cabinet door; 102. Gas chromatograph body; 103. Connecting pipe; 2. Filter barrel; 201. Filter plate; 202. Filter plate holder; 203. Fan frame; 204. Air inlet fan; 3. Molecular sieve barrel; 301. Feed pipe; 302. Sealing cap; 303. First support net; 304. Second support net; 305. Arc-shaped fixing plate; 306. Hollow column; 307. Spring; 308. Moving column; 309. Guide column; 4. Gas diffusion barrel; 401. Slide groove; 402. Rotating frame; 403. Irregularly shaped plate; 404. Connecting column; 405. Tapered threaded vent; 406. Sample inlet pipe; 5. Sample inlet hood; 501. Sample inlet external pipe. Detailed Implementation

[0022] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0023] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0024] like Figures 1 to 4The illustrated molecular sieve for gas chromatographs includes a gas chromatograph body 102. The gas chromatograph body 102 is existing technology, and reference can be made to the Agilent 7890A / B gas chromatograph. This technology utilizes a carrier gas system, sample injection system, separation system, detection system, temperature control system, and data processing system to achieve sample separation and analysis. This is not an innovative direction for the molecular sieve used in this gas chromatograph and will not be described in detail. The gas chromatograph body 102 is externally connected to a gas chromatograph protective cabinet 1. A molecular sieve container for holding molecular sieve materials is located on the side of the gas chromatograph protective cabinet 1. 3. Three hollow columns 306 are welded to the inner wall of the molecular sieve barrel 3. Each of the three hollow columns 306 contains a spring 307. One end of each spring 307 is connected to a movable column 308. The end of the movable column 308 away from the spring 307 is connected to a second support net 304. A first support net 303 is installed inside the molecular sieve barrel 3. The filtered gas contacts the molecular sieve material through the first support net 303, completing the filtration process. A feed pipe 301 connects to the outer periphery of the molecular sieve barrel 3. The basic structure of the molecular sieve is a three-dimensional network structure formed by silicon-oxygen tetrahedra and aluminum-oxygen tetrahedra connected by shared oxygen atoms. In the silicon-oxygen tetrahedra, the silicon atom is located at the center of the tetrahedron, and four oxygen atoms are located at the four vertices. In the aluminum-oxygen tetrahedra, the aluminum atom is located at the center, and four oxygen atoms are located at the vertices. Because aluminum atoms are trivalent and silicon atoms are tetravalent, when aluminum atoms replace silicon atoms to form aluminum-oxygen tetrahedra, the tetrahedral units acquire a negative charge. Molecular sieve particles are typically small granules, which can be spherical, cylindrical, or irregular in shape. Spherical molecular sieve particles have better flowability and can be evenly distributed during filling, while cylindrical particles sometimes have advantages in certain special filling methods. The particle size is generally between tens of micrometers and several millimeters, and different particle sizes of molecular sieve particles are selected for different applications. A sealing cap 302 is installed at the end of the feed pipe 301 away from the molecular sieve tank 3. Opening the sealing cap 302 allows the molecular sieve material to be introduced into the molecular sieve tank 3 from the feed pipe 301. The inner wall of the molecular sieve tank 3 is connected to guide columns 309, and an arc-shaped fixing plate 305 is installed on the outside of the molecular sieve tank 3. After a period of time, the bonding between the molecular sieve particles may become insufficient, leading to uneven flow channels for gas when passing through the molecular sieve bed. Gas may form fast channels in some areas with larger gaps, while flowing slowly in other areas. This will prevent the gas from contacting the molecular sieve evenly, reducing the separation and purification effect of the molecular sieve on the gas. Due to the action of the spring 307, the spring 307 continuously generates a squeezing force on the moving column 308. The moving column 308 squeezes the molecular sieve material particles between the first support net 303 and the second support net 304, which can adapt to the squeezing force of the molecular sieve material particles and ensure the gap between the molecular sieve particles.

[0025] One end of the molecular sieve barrel 3 is connected to a gas diffusion barrel 4. The gas diffusion barrel 4 has a chute 401 inside, and a rotating frame 402 is rotatably connected inside the chute 401. Multiple irregularly shaped plates 403 are connected to the side of the rotating frame 402, and connecting columns 404 are welded to the ends of the multiple irregularly shaped plates 403. The connecting columns 404 have tapered threaded vent holes 405 inside. The end of the gas diffusion barrel 4 away from the molecular sieve barrel 3 is connected to an injection tube 406. The screened gas enters the gas diffusion barrel 4 through the second support net 304. Due to the structure of the irregularly shaped plates 403 and the tapered threaded vent holes 405, the gas blows the irregularly shaped plates 403, causing them to rotate. This can eliminate local turbulence caused by uneven adsorption inside the molecular sieve or during gas flow, allowing the gas to flow out of the device in a more stable state and enter the subsequent components of the gas chromatograph. This ensures the stability and uniformity of gas flow in the entire gas chromatography system and avoids interference with subsequent detection and analysis.

[0026] The other end of the molecular sieve barrel 3 is connected to the filter barrel 2. A filter plate frame 202 is welded inside the filter barrel 2. A filter plate 201 is installed inside the filter plate frame 202. A fan frame 203 is welded to the side of the filter plate frame 202. An air inlet fan 204 is installed on the side of the fan frame 203 away from the filter plate frame 202. When the air inlet fan 204 is turned on, external gas enters the filter barrel 2 through the sample inlet pipe 501 and the sample inlet hood 5. The filter plate 201 comes into contact with the gas and adsorbs and filters the incoming gas.

[0027] A sample inlet hood 5 is rotatably connected to the side of the filter barrel 2. The end of the sample inlet hood 5 away from the filter barrel 2 is connected to an external sample inlet pipe 501, which connects the external sample inlet pipe 501 to an external detection gas.

[0028] The side of the gas chromatograph protection cabinet 1 is equipped with a cabinet door 101. The inlet of the gas chromatograph body 102 is connected to a connecting tube 103. Gas enters the gas chromatograph body 102 through the inlet tube 406 and the connecting tube 103, and the gas chromatograph body 102 analyzes the gas.

[0029] Working principle

[0030] This gas chromatograph uses molecular sieves. In use, first connect the external injection pipe 501 to the external detection gas, open the sealing cap 302, and introduce the molecular sieve material into the molecular sieve container 3 through the feed pipe 301. Turn on the air blower 204, and the external gas enters the filter container 2 through the external injection pipe 501 and the injection hood 5. The filter plate 201 contacts the gas, adsorbing and filtering the incoming gas. The filtered gas then contacts the molecular sieve material through the first support mesh 303, completing the filtration process. The filtered gas then passes through the second support mesh 304 and enters the gas diffusion container 4. Due to the structure of the shaped plate 403 and the tapered threaded vent 405, the gas... The air mass blows the irregularly shaped plate 403, causing it to rotate. This eliminates local turbulence caused by uneven adsorption within the molecular sieve or during gas flow, allowing the gas to exit the device in a more stable state and enter subsequent components of the gas chromatograph. This ensures the stability and uniformity of gas flow throughout the gas chromatography system, preventing interference with subsequent detection and analysis. The gas enters the gas chromatograph body 102 through the injection tube 406 and connecting tube 103. The gas chromatograph body 102 analyzes the incoming gas. After a period of time, the bonding between the molecular sieve particles may become less tight, leading to uneven gas flow channels as the gas passes through the molecular sieve bed. The gas may form fast channels in areas with larger gaps, while flowing more slowly in other areas. This will prevent the gas from contacting the molecular sieve evenly, reducing the separation and purification effect of the molecular sieve on the gas. Due to the action of the spring 307, the spring 307 continuously generates a squeezing force on the moving column 308. The moving column 308 squeezes the molecular sieve material particles between the first support net 303 and the second support net 304, which can adapt to the squeezing force of the molecular sieve material particles and ensure the gap between the molecular sieve particles.

[0031] It should be noted that in this article, relational terms such as one and two are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molecular sieve for gas chromatograph, comprising a gas chromatograph body (102), characterized in that: The gas chromatograph body (102) is externally connected to a gas chromatograph protection cabinet (1). A molecular sieve bucket (3) for holding molecular sieve materials is provided on the side of the gas chromatograph protection cabinet (1). Three hollow columns (306) are welded to the inner wall of the molecular sieve bucket (3). Springs (307) are provided inside the three hollow columns (306). A moving column (308) is connected to one end of the spring (307). A second support net (304) is connected to the end of the moving column (308) away from the spring (307). A first support net (303) is installed inside the molecular sieve bucket (3). A feed pipe (301) is connected to the outer periphery of the molecular sieve bucket (3). A sealing cap (302) is installed at the end of the feed pipe (301) away from the molecular sieve bucket (3). A guide column (309) is connected to the inner wall of the molecular sieve bucket (3). An arc-shaped fixing plate (305) is installed on the outside of the molecular sieve bucket (3).

2. The molecular sieve for gas chromatograph according to claim 1, characterized in that: One end of the molecular sieve barrel (3) is connected to a gas diffusion barrel (4), and a chute (401) is provided inside the gas diffusion barrel (4). A rotating frame (402) is rotatably connected inside the chute (401).

3. A molecular sieve for gas chromatographs according to claim 2, characterized in that: The rotating frame (402) is connected to a plurality of irregular plates (403) on its side. The ends of the plurality of irregular plates (403) are welded with connecting columns (404). The connecting columns (404) are provided with tapered threaded vent holes (405). The end of the gas diffusion barrel (4) away from the molecular sieve barrel (3) is connected to a sample inlet tube (406).

4. A molecular sieve for gas chromatograph according to claim 2, characterized in that: The other end of the molecular sieve barrel (3) is connected to a filter barrel (2), and a filter plate frame (202) is welded inside the filter barrel (2), and a filter plate (201) is provided inside the filter plate frame (202).

5. A molecular sieve for gas chromatograph according to claim 4, characterized in that: A fan frame (203) is welded to the side of the filter plate frame (202), and an air intake fan (204) is installed on the side of the fan frame (203) away from the filter plate frame (202).

6. A molecular sieve for gas chromatograph according to claim 4, characterized in that: The side of the filter barrel (2) is rotatably connected to the sample inlet cover (5), and the end of the sample inlet cover (5) away from the filter barrel (2) is connected to the sample inlet external tube (501).

7. A molecular sieve for gas chromatography according to claim 1, characterized in that: The side of the gas chromatograph protection cabinet (1) is equipped with a cabinet door (101), and the inlet of the gas chromatograph body (102) is connected to a connecting tube (103).

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