Sampling adsorption tube for tetrahydrofuran in air and waste gas
By dividing the glass tube into two groups and using connecting tubes, reinforcing rings, and rubber rings to achieve flexible assembly and connection, the problems of difficult operation and interference from impurity peaks are solved, improving the ease of operation and detection accuracy of the tetrahydrofuran sampling adsorption tube.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2026-03-13
AI Technical Summary
Existing tetrahydrofuran sampling adsorption tubes are difficult to insert into the glass tube when inserting the separator layer, and the commercially available GDX-401 support tube generates a large number of impurity peaks during desorption, which interferes with the detection of the target peak.
The glass tube is divided into two groups and flexibly assembled and connected by connecting tubes, reinforcing rings and rubber rings. It is sealed with a sealing cap and combined with organic support, glass wool and polyurethane foam as detection materials. The connection structure is improved to facilitate operation and reduce interference from impurity peaks.
This design facilitates the loading of materials into the glass tube by operators, enhances the practicality of the device, reduces interference from impurity peaks on the target peak, and improves the accuracy of detection.
Smart Images
Figure CN223992730U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas sampling adsorption tube technology, and in particular to a tetrahydrofuran sampling adsorption tube for air and exhaust gas. Background Technology
[0002] Tetrahydrofuran sampling adsorption tubes are commonly used in occupational health air monitoring and environmental monitoring, especially for the detection of tetrahydrofuran in exhaust gases from stationary pollution sources. These adsorption tubes contain specific adsorption materials that can effectively capture tetrahydrofuran from gas samples.
[0003] Existing tetrahydrofuran sampling adsorption tubes often use a long glass tube. When inserting urethane foam as a separator into the middle section of the glass tube, it is difficult to complete the operation without specific tools, which affects the detection process. At the same time, the commercially available GDX-401 support tube uses carbon disulfide desorption, and the gas chromatograph injection produces a lot of impurity peaks, which interfere with the target peak of tetrahydrofuran.
[0004] Therefore, to address the above issues, a sampling adsorption tube for tetrahydrofuran in air and exhaust gas can be designed. The long glass tube is cut in the middle and set up separately, and then assembled and connected when needed. This makes it easier for operators to insert material into the middle section of the glass tube. At the same time, the processing flow of the organic support is improved to reduce the interference of impurity peaks on the target peak. Utility Model Content
[0005] To overcome the problem that most existing tetrahydrofuran sampling adsorption tubes often use a long glass tube, inserting urethane foam as a separator into the middle section of the glass tube is difficult without specific tools, thus affecting the detection process. At the same time, the commercially available GDX-401 support tube uses carbon disulfide desorption, resulting in a large number of impurity peaks eluting during gas chromatography injection, which interferes with the target peak of tetrahydrofuran.
[0006] The technical solution of this utility model is as follows: a sampling adsorption tube for tetrahydrofuran in air and exhaust gas, comprising a glass tube; characterized in that: it further comprises a sealing cap, an organic support, glass wool, polyurethane foam, a connecting tube, a reinforcing hoop, and a rubber ring; two sets of glass tubes are provided, one end of the glass tube is provided with a sealing cap made of rubber, the inner side of the glass tube is provided with an organic support, glass wool, and polyurethane foam, a connecting tube is provided at the connection of the two sets of glass tubes, a reinforcing hoop is provided on the outer side of the connecting tube, and a rubber ring is provided on the inner side of the connecting tube.
[0007] Preferably, the device incorporates an organic support, glass wool, and polyurethane foam as necessary materials for testing, using a glass tube to hold these materials. Before use, both ends of the glass tube are sealed with a sealing cap. A connecting pipe connects the two sets of glass tubes when needed, and a reinforcing ring strengthens the connection between the connecting pipe and the glass tube. A rubber ring, also using the reinforcing ring, enhances the sealing of the connection between the connecting pipe and the glass tube. This allows for flexible assembly and connection of the glass tubes after separation, facilitating the loading of materials into the glass tubes and enhancing the practical value of the device.
[0008] Preferably, the glass wool is located at the upper end of the upper set of glass tubes, and two sets of organic support bodies are provided, with one set of organic support bodies located at the lower end of the upper set of glass tubes.
[0009] Preferably, there are two sets of polyurethane foam: one set of polyurethane foam is located at the lower end of the lower set of glass tubes, and the other set of polyurethane foam is located inside the connecting tube. An organic support is located at the upper end of the lower set of glass tubes.
[0010] Preferably, a connecting plate is provided on one side of the reinforcing hoop, and two sets of connecting plates are provided. An adjustable-length threaded connector is provided through the inner side of the connecting plate, and the threaded connector is composed of a bolt and a nut.
[0011] Preferably, limiting grooves are provided at both ends of the outer side of the connecting pipe, the width of the limiting grooves is the same as the width of the reinforcing hoop, and the reinforcing hoop is located inside the limiting grooves.
[0012] Preferably, the connecting tube has insertion grooves at both ends, the width of which is the same as the thickness of the glass tube, and the rubber ring is located at the contact point between the inner wall of the glass tube and the connecting tube.
[0013] Preferably, the inner middle of the connecting pipe is provided with anti-slip texture, and polyurethane foam is located at the anti-slip texture, and the polyurethane foam and the anti-slip texture are interlocked.
[0014] The beneficial effects of this utility model are:
[0015] 1. The original longer glass tube is cut in half and installed separately. A connecting pipe is used to connect the two sets of glass tubes when needed. Reinforcing rings are used to strengthen the connection between the connecting pipe and the glass tube, and rubber rings are used to enhance the seal between the connecting pipe and the glass tube. This allows for flexible assembly and connection of the separate glass tubes, facilitating the loading of materials into the glass tubes and enhancing the practical value of the device. Attached Figure Description
[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of a tetrahydrofuran sampling adsorption tube for air and exhaust gas according to this utility model.
[0017] Figure 2 The diagram shown is a cross-sectional three-dimensional structural schematic of a tetrahydrofuran sampling adsorption tube for air and exhaust gas according to this utility model.
[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the connecting tube of a tetrahydrofuran sampling adsorption tube in air and exhaust gas according to this utility model.
[0019] Figure 4 The diagram shown is a three-dimensional cross-sectional view of the connecting tube of a tetrahydrofuran sampling adsorption tube in air and exhaust gas according to this utility model.
[0020] Explanation of reference numerals in the attached drawings: 1. Glass tube; 2. Sealing cap; 3. Organic support body; 4. Glass wool; 5. Polyurethane foam; 6. Connecting pipe; 601. Limiting groove; 602. Anti-slip texture; 603. Insertion groove; 7. Reinforcing hoop; 701. Connecting plate; 702. Threaded connector; 8. Rubber ring. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] Please see Figures 1-4 This utility model provides an embodiment: a tetrahydrofuran sampling adsorption tube for air and exhaust gas, comprising a glass tube 1, a sealing cap 2, an organic support 3, glass wool 4, polyurethane foam 5, a connecting tube 6, a reinforcing ring 7, and a rubber ring 8; two sets of glass tubes 1 are provided, one end of which is provided with a sealing cap 2, the sealing cap 2 being made of rubber, the inner side of the glass tube 1 being provided with an organic support 3, glass wool 4, and polyurethane foam 5, and a connecting tube 6 being provided at the connection of the two sets of glass tubes 1, the outer side of the connecting tube 6 being provided with a reinforcing ring 7, and the inner side of the connecting tube 6 being provided with a rubber ring 8.
[0023] Please see Figure 2 In this embodiment, glass wool 4 is located at the upper end of the upper set of glass tubes 1. Two sets of organic support 3 are provided, one set of organic support 3 is located at the lower end of the upper set of glass tubes 1, and the weight of this set of organic support 3 is 150mg. Two sets of polyurethane foam 5 are provided, one set of polyurethane foam 5 is located at the lower end of the lower set of glass tubes 1, and the other set of polyurethane foam 5 is located inside the connecting tube 6. One set of organic support 3 is located at the upper end of the lower set of glass tubes 1, and the weight of this set of organic support 3 is 75mg. This material distribution is the material distribution of mainstream sampling tubes on the market, making the device compatible with mainstream detection methods on the market.
[0024] Please see Figure 3In this embodiment, a connecting plate 701 is provided on one side of the reinforcing hoop 7. Two sets of connecting plates 701 are provided. An adjustable threaded connector 702 is provided through the inner side of the connecting plate 701. The threaded connector 702 is composed of a bolt and a nut. By adjusting the length of the threaded connector 702, the two sets of connecting plates 701 are driven to move closer to each other, thereby continuously shortening the diameter of the reinforcing hoop 7 to apply pressure to the connecting pipe 6, increasing the friction between the connecting pipe 6 and the outer wall of the glass tube 1, and making the connection between the connecting pipe 6 and the glass tube 1 more secure.
[0025] Please see Figure 4 In this embodiment, limiting grooves 601 are provided at both ends of the outer side of the connecting pipe 6. The width of the limiting grooves 601 is the same as the width of the reinforcing ring 7. The reinforcing ring 7 is located inside the limiting grooves 601. Insertion grooves 603 are provided at both ends of the connecting pipe 6. The width of the insertion grooves 603 is the same as the thickness of the glass tube 1. The rubber ring 8 is located at the contact point between the inner wall of the glass tube 1 and the connecting pipe 6. Anti-slip textures 602 are provided at the middle of the inner side of the connecting pipe 6. The polyurethane foam 5 is located at the anti-slip textures 602, and the polyurethane foam 5 and the anti-slip textures 602 are interlocked. The limiting grooves 601 are used to restrict the position of the reinforcing ring 7 to prevent the reinforcing ring 7 from slipping. The insertion grooves 603 are used to provide an insertion space for the glass tube 1 and guide it. The anti-slip textures 602 are used to prevent the polyurethane foam 5 located inside the connecting pipe 6 from moving.
[0026] During the connection and assembly, after filling the glass tube 1 with suitable material, align the wall of the glass tube 1 with the insertion groove 603, insert the glass tube 1 into the connecting tube 6, and then tighten the threaded connector 702 to bring the two sets of connecting plates 701 closer together. This causes the diameter of the reinforcing ring 7 to continuously shorten, applying pressure to the connecting tube 6 and increasing the friction between the connecting tube 6 and the outer wall of the glass tube 1, making the connection between the connecting tube 6 and the glass tube 1 more secure. Then, insert a set of polyurethane foam 5 into the inside of the connecting tube 6 and ensure that the polyurethane foam 5 is in close contact with the anti-slip texture 602. Repeat the above operation with the other assembled glass tube 1. Finally, to seal the connection of the two sets of glass tubes 1, put the sealing cap 2 on the unconnected end of the glass tube 1 to complete the assembly.
[0027] In the preparation stage, organic support 3 is first soaked in ether and shaken, and the ether is filtered off. Then, organic support 3 is soaked in carbon disulfide and shaken, and the carbon disulfide is filtered off to remove the organic matter adsorbed on organic support 3. Then, it is washed with methanol to remove residual ether, and then washed with distilled water to remove methanol. It is dried at 120°C for 2 hours, and then dried at 150°C for 2 hours. It is then sealed for later use.
[0028] Through the above steps, by setting up glass tube 1 to contain organic support 3, glass wool 4 and polyurethane foam 5 as the necessary materials for testing, sealing both ends of glass tube 1 with sealing cap 2 before use, connecting pipe 6 to connect two sets of glass tubes 1 when needed to complete the splicing connection, reinforcing ring 7 to strengthen the connection between connecting pipe 6 and glass tube 1, and rubber ring 8 to strengthen the sealing of the connection between connecting pipe 6 and glass tube 1 with reinforcing ring 7, flexible assembly and connection of glass tube 1 after separation is achieved, which makes it convenient for operators to load materials into glass tube 1 and enhances the practical value of the device.
[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A sampling and adsorption tube for tetrahydrofuran in air and exhaust gas comprising a glass tube (1); characterized in that: It also includes sealing cap (2), organic carrier (3), glass wool (4), polyurethane foam (5), connecting pipe (6), reinforcing hoop (7) and rubber ring (8); glass tube (1) is provided with two groups, one end of glass tube (1) is provided with sealing cap (2), the manufacturing material of sealing cap (2) is rubber, the inner side of glass tube (1) is provided with organic carrier (3), the inner side of glass tube (1) is provided with glass wool (4), the inner side of glass tube (1) is provided with polyurethane foam (5), the connecting pipe (6) is provided at the connecting place of two groups of glass tube (1), the outer side of connecting pipe (6) is provided with reinforcing hoop (7), the inner side of connecting pipe (6) is provided with rubber ring (8).
2. The air and exhaust gas sampling adsorption tube according to claim 1, characterized in that: Glass wool (4) is located at the upper end of the upper group of glass tubes (1), and the organic carrier (3) is provided with two groups, one group of organic carrier (3) is located at the lower end of the upper group of glass tubes (1).
3. The air and exhaust gas sampling adsorption tube according to claim 1, characterized in that: Polyurethane foam (5) is provided with two groups, one group of polyurethane foam (5) is located at the lower end of the lower group of glass tubes (1), and the other group of polyurethane foam (5) is located inside the connecting pipe (6), and one group of organic carrier (3) is located at the upper end of the lower group of glass tubes (1).
4. The air and exhaust gas sampling adsorption tube according to claim 1, characterized in that: The reinforcing hoop (7) is provided with a connecting plate (701) on one side, the connecting plate (701) is provided with two groups, the inner side of the connecting plate (701) is provided with a length-adjustable threaded connection (702) penetratingly, and the threaded connection (702) is composed of a bolt and a nut.
5. The air and exhaust gas sampling adsorption tube according to claim 1, characterized in that: The outer side of the connecting pipe (6) is provided with a limiting groove (601) at both ends, the width of the limiting groove (601) is consistent with the width of the reinforcing hoop (7), and the reinforcing hoop (7) is located inside the limiting groove (601).
6. The air and exhaust gas sampling adsorption tube according to claim 1, characterized in that: The both ends of the connecting pipe (6) are provided with insertion grooves (603), the width of the insertion grooves (603) is consistent with the thickness of the glass tube (1), and the rubber ring (8) is located at the contact position of the inner wall of the glass tube (1) and the connecting pipe (6).
7. The air and exhaust gas sampling adsorption tube according to claim 1, characterized in that: The inner side of the connecting pipe (6) is provided with anti-skid lines (602) at the middle end, the polyurethane foam (5) is located at the anti-skid lines (602), and the polyurethane foam (5) and the anti-skid lines (602) are embedded with each other.