Test tube box with sealing cover for gas chromatograph
By designing a test tube box with a sealed lid, and utilizing a temperature control chamber and a sealed sampling port mechanism, the problem of test tubes being affected by ambient temperature during gas chromatography detection was solved. This achieved precise temperature control and sealing within the test tubes, improving the accuracy and reliability of the detection results.
Patent Information
- Application Number
- CN202423060993.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In existing gas chromatographs, the containers holding test tubes are directly exposed to the indoor environment, making them highly susceptible to temperature changes and affecting the quality of the tests.
Design a test tube box with a closed lid, including a tray and a lid. The tray contains a temperature control chamber, a heater, and a cooler. The lid has a sealing sampling port mechanism. The seal is achieved by the elastic reset of the arc plate and the fan plate. Combined with a temperature controller and a temperature display screen, the temperature inside the test tube can be precisely controlled to isolate the influence of the external environment.
It effectively isolates changes in external ambient temperature, ensures stable temperature inside the test tube, improves the accuracy and reliability of test results, and is easy to operate with good sealing.
Smart Images
Figure CN223543031U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of detection and analysis equipment technology, specifically a test tube box for a gas chromatograph with a sealed lid. Background Technology
[0002] Gas chromatography (GC) is an instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis of complex mixtures of multiple components. It is typically used to analyze thermally stable organic compounds in water with boiling points not exceeding 500°C, such as volatile organic compounds, organochlorines, organophosphorus compounds, polycyclic aromatic hydrocarbons, and phthalates. The mixture to be tested is usually dissolved in reagents and contained in test tubes. A microsyringe is used to move the sample. The overall quality of the detection results is subject to certain requirements regarding the temperature range of the analyte. In existing GC apparatuses, the containers holding the test tubes are generally directly exposed to the indoor environment, making them highly susceptible to temperature variations and prone to volatilization, which to some extent affects the separation and detection quality of the GC. Utility Model Content
[0003] The purpose of this invention is to provide a test tube box for a gas chromatograph with a sealed lid, which can isolate the test tube containing the mixture to be tested from the external environment and maintain the required temperature range inside, minimizing volatilization in a relatively low temperature environment, thus solving the problems in the prior art.
[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a test tube box for a gas chromatograph with a sealed lid, including a tray with a snap-on lid that can be closed; several slots for holding test tubes on the tray; a temperature control chamber inside the tray, in which a heater and a cooler are installed; a temperature controller and a temperature display screen are installed on the outer surface of the tray; a temperature probe is installed inside the lid; the temperature probe, heater, and cooler are all connected to the temperature controller through control lines; and a corresponding sealing sampling port mechanism is provided on the top surface of the lid corresponding to the position of each slot. Each sealed sampling port mechanism includes several circumferentially arranged arc plates. The outer ends of the arc plates are hinged to the cover, and the inner ends of the arc plates are hinged to a sector plate. All the arc plates and sector plates in the same sealed sampling port mechanism can form a closed circular plate. A first torsion spring is provided between the arc plate and the cover, and a second torsion spring is provided between the arc plate and the sector plate. The first and second torsion springs always tend to rotate the arc plates and sector plates until they are flush with the cover. When the sampler needle passes downward through the sealed sampling port mechanism, it can overcome the elastic force of the first and second torsion springs to push the arc plates and sector plates open and enter the test tube in the cover. A first baffle is provided on the cover above the arc plate, and a second baffle is provided at the end of the arc plate below the sector plate. When the first torsion spring drives the arc plate to rotate until it contacts the first baffle, the arc plate is flush with the cover. When the second torsion spring drives the sector plate to rotate until it contacts the second baffle, the sector plate is flush with the arc plate. The bottom surface of the arc plate is provided with a first elastic sealing sheet, and the first elastic sealing sheets at the bottom of adjacent arc plates are arranged overlappingly. The bottom surface of the fan-shaped plate is provided with a second elastic sealing sheet, and the second elastic sealing sheets at the bottom of adjacent fan-shaped plates are arranged overlappingly. When the arc plate and fan-shaped plate are rotated to be flush with the cover, the first and second elastic sealing sheets can block and seal the inlet of the sealing sampling port mechanism. The heater and cooler are located at one end of the length direction of the temperature control chamber. A fan is also installed on one side of the heater and cooler. Ventilation holes are opened between adjacent slots, and the ventilation holes connect the temperature control chamber with the internal space of the cover. The bottom of the cover is provided with an insert block, and the outer periphery of the top surface of the tray is provided with a slot that mates with the insert block. A horizontally arranged sealing ring is also provided on the outside of the insert block. The bottom of the sealing ring is provided with a sealing protrusion, and a sealing ring groove that mates with the sealing protrusion is opened on the top surface of the tray outside the slot.
[0005] The positive effects of this utility model are as follows: The gas chromatograph test tube box with a sealed lid, as described in this utility model, can precisely control the temperature of the mixture to be tested inside the test tube through a temperature control chamber opened inside the tray and the installed heater and cooler, meeting the strict temperature range requirements of the gas chromatograph, and keeping the analyte in a relatively low temperature environment to minimize volatilization, thereby improving the accuracy and reliability of the detection results. The sealing sampling port mechanism set on the lid, using the cooperation of the arc plate and the sector plate and the elastic reset action of the torsion spring, realizes the opening and closing during sampling, which not only facilitates the sampling operation, but also ensures the sealing of the test tube box when not sampling, minimizing the influence of the external environment on the sample inside the test tube. It can not only effectively isolate the influence of the external environment on the sample inside the test tube, maintain the required temperature change range, and improve the accuracy and reliability of the detection results, but also has the advantages of simple operation, stable structure, and good sealing performance. Attached Figure Description
[0006] Figure 1 This is a schematic diagram of the structure of this utility model;
[0007] Figure 2 This is a side sectional view of the present invention;
[0008] Figure 3 This is a top view of the sealing sampling port mechanism on the cover;
[0009] Figure 4 yes Figure 3 A schematic diagram of the closed state of the structure;
[0010] Figure 5 This is a schematic diagram showing the sampler needle passing downward through the sealed sampling port mechanism.
[0011] Figure 6 This is a schematic diagram of a structure with elastic sealing sheets installed at the bottom of the arc plate and the sector plate;
[0012] Figure 7 This is a partial cross-sectional view showing the sealing ring between the cover and the tray. Detailed Implementation
[0013] The present invention relates to a test tube box for a gas chromatograph with a sealed lid, such as... Figure 1-4 As shown, it includes a tray 1, on which a snap-on cover 2 is installed to form a sealed environment that is relatively isolated from the external environment. The internal temperature can be set according to the testing requirements, and it is less affected by changes in the external temperature, which can effectively ensure the quality of the test.
[0014] The tray 1 has several slots 3 for holding test tubes. Each slot 3 contains a test tube containing the sample to be tested. The inside of the tray 1 has a temperature control chamber 4, in which a heater 5 and a cooler 6 are installed. A temperature controller 7 and a temperature display screen 8 are installed on the outer surface of the tray 1. A temperature probe 9 is installed inside the cover 2. The temperature probe 9, heater 5 and cooler 6 are all connected to the temperature controller 7 through control lines.
[0015] Heater 5 and cooler 6 are regulated by temperature controller 7 to achieve precise control of the ambient temperature of the test tube. Temperature probe 9 can monitor the internal temperature in real time and transmit the data to temperature display screen 8. Temperature controller 7 and temperature display screen 8, located on the outer surface of tray 1, facilitate real-time monitoring and temperature adjustment by the user. Heater 5 can be an existing preheating device (HP-1515) for heating, cooler 6 can be an existing radiator (HS30150F) for cooling, and temperature controller 7 can be an existing automatic temperature controller (REX-C100) for temperature adaptive adjustment.
[0016] Corresponding to the position of each slot 3, a corresponding sealing sampling port mechanism is provided on the top surface of the cover 2. The sealing sampling port mechanism can maintain the relative sealing of the test tube box when no sampler needle is inserted, reducing the influence of external environmental temperature changes on the analyte. At the same time, when sampling is required, the sealing sampling port mechanism can allow the sampler needle to be inserted into the test tube. After the sample is collected, when the sampler needle is withdrawn from the test tube box, the sealing sampling port mechanism can return to the initial relative sealing state, thereby minimizing the influence of external environmental temperature changes on the sampling operation.
[0017] The sealing sampling port mechanism includes several circumferentially arranged arc plates 10. The outer ends of the arc plates 10 are hinged to the cover 2, and the inner ends of the arc plates 10 are hinged to a sector plate 11. All the arc plates 10 and sector plates 11 in the same sealing sampling port mechanism can form a closed circular plate, thereby forming a relatively sealed state. A first torsion spring 12 is provided between the arc plate 10 and the cover 2, and a second torsion spring 13 is provided between the arc plate 10 and the sector plate 11. The first torsion spring 12 and the second torsion spring 13 always tend to rotate the arc plate 10 and the sector plate 11 to be flush with the cover 2, that is, to rotate the arc plate 10 and the sector plate 11 to close the orifice of the sampling port.
[0018] like Figure 5As shown, when the sampler needle passes downward through the sealed sampling port mechanism, it can overcome the elastic force of the first torsion spring 12 and the second torsion spring 13 to push open the arc plate 10 and the sector plate 11 and enter the test tube in the cap 2. At this time, the sector plate 11 is horizontally located at the top of the test tube, and the arc plate 10 is arranged at an angle. The two parts of the sector plate 11 and the arc plate 10 are two separate bending structures, which can better adapt to the shape of the sampler needle, which is thinner at the bottom and thicker at the top. Moreover, the downward bending of the sector plate 11 will not affect the normal sampling operation inside the test tube. The bending state of the arc plate 10 and the sector plate 11 during the above sampling process can make the distance between the test tube and the cap 2 smaller. Under the premise of effectively storing the test tube, the space between the cap 2 and the tray 1 can be smaller, thereby making it easier to achieve temperature control of the internal environment.
[0019] Furthermore, in order to ensure that the arc plate 10 and the sector plate 11 can be accurately reset to a horizontal and closed state under the elastic force of the first torsion spring 12 and the second torsion spring 13 respectively, and to avoid excessive rotation angle, which could cause the arc plate 10 and the sector plate 11 to warp at a certain position and fail to achieve relative sealing of the internal environment, a first baffle 14 is provided on the cover 2 on the upper side of the arc plate 10, and a second baffle 15 is provided at the end of the arc plate 10 located on the lower side of the sector plate 11.
[0020] When the first torsion spring 12 rotates the arc plate 10 to contact the first baffle 14, the arc plate 10 is flush with the cover 2. When the second torsion spring 13 rotates the sector plate 11 to contact the second baffle 15, the sector plate 11 is flush with the arc plate 10. The first baffle 14 and the second baffle 15 can respectively achieve the reset rotation limit of the arc plate 10 and the sector plate 11, ensuring that after the sampler needle is withdrawn, the arc plate 10 and the sector plate 11 can re-close the sampling port.
[0021] To further enhance the sealing performance of the arc plate 10 and the sector plate 11 for the sampling port, such as Figure 6 As shown, the bottom surface of the arc plate 10 is provided with a first elastic sealing sheet 16, and the first elastic sealing sheets 16 at the bottom of adjacent arc plates 10 are arranged overlappingly. The bottom surface of the fan-shaped plate 11 is provided with a second elastic sealing sheet 17, and the second elastic sealing sheets 17 at the bottom of adjacent fan-shaped plates 11 are arranged overlappingly.
[0022] When the arc plate 10 and the sector plate 11 are rotated to be aligned with the cover 2, the first elastic sealing sheet 16 and the second elastic sealing sheet 17 can block and seal the inlet of the sampling port mechanism. The adjacent overlapping arrangement of the above elastic sealing sheets can block the gap between adjacent arc plates 10 and sector plates 11, thereby effectively improving the sealing performance, ensuring the stability of the internal environment of the test tube box, and also helping to maintain the purity and stability of the sample in the test tube.
[0023] Furthermore, the heater 5 and cooler 6 are located at one end of the length of the temperature control chamber 4. A fan 18 is also installed on one side of the heater 5 and cooler 6. The fan 18 promotes the uniform distribution and rapid transfer of heat, thereby quickly reducing the temperature difference in the internal environment. Ventilation holes 19 are provided between adjacent slots 3, which connect the temperature control chamber 4 to the internal space of the cover 2, allowing heat to be transferred to the test tube more effectively, thus improving the efficiency and uniformity of temperature control to a certain extent.
[0024] Furthermore, in order to improve the sealing performance of the insertion fit between the cover 2 and the tray 1, such as Figure 7 As shown, the bottom of the cover 2 is provided with an insert block 20, and the outer periphery of the top surface of the tray 1 is provided with a slot 21 that cooperates with the insert block 20. A horizontally arranged sealing ring 22 is also provided on the outside of the insert block 20. A sealing protrusion 23 is provided at the bottom of the sealing ring 22. A sealing ring groove 24 that cooperates with the sealing protrusion 23 is opened on the top surface of the tray 1 outside the slot 21.
[0025] The aforementioned insert 20 and slot 21 form a seal, and the sealing protrusion 23 and sealing ring groove 24 form a second seal, which enhances the connection stability and sealing between the cover and the tray, and prevents the test tube box from being accidentally opened or from exchanging heat with the external environment due to external factors.
[0026] The slot 3 can also hold a sample bottle containing the analyte. The end of the sample bottle can be equipped with a headspace cap sealing structure, that is, a polytetrafluoroethylene (PTFE) is provided at the center of the top and a sealing cap is provided on the outer periphery to achieve a relative seal. When the sample is injected, the injection needle can pierce the PTFE to enter the sample bottle and draw the solution inside.
[0027] The gas chromatograph test tube box with a sealed cap described in this utility model has the advantages of stable structure, simple operation, good sealing performance, and precise temperature control, which can significantly improve the separation and detection quality of gas chromatographs.
[0028] The technical solution of this utility model is not limited to the scope of the embodiments described herein. All technical contents not described in detail herein are publicly known technologies.
Claims
1. A test tube box for a gas chromatograph with a sealed cap, characterized in that: The system includes a tray (1), a snap-on cover (2) installed on the tray (1), several slots (3) for holding test tubes on the tray (1), a temperature control chamber (4) inside the tray (1), a heater (5) and a cooler (6) installed in the temperature control chamber (4), a temperature controller (7) and a temperature display screen (8) installed on the outer surface of the tray (1), a temperature probe (9) installed inside the snap-on cover (2), and the temperature probe (9), heater (5) and cooler (6) are all connected to the temperature controller (7) through control lines. Corresponding to the position of each slot (3), a one-to-one sealing sampling port mechanism is provided on the top surface of the snap-on cover (2), and each sealing sampling port mechanism includes several circumferentially arranged arc plates (10). The outer end of the arc plate (10) is hinged to the cover (2), and the inner end of the arc plate (10) is hinged to the fan plate (11). All the arc plates (10) and fan plates (11) in the same sealed sampling port mechanism can form a closed circular plate. A first torsion spring (12) is provided between the arc plate (10) and the cover (2), and a second torsion spring (13) is provided between the arc plate (10) and the fan plate (11). The first torsion spring (12) and the second torsion spring (13) always tend to rotate the arc plate (10) and the fan plate (11) to be flush with the cover (2). When the sampler needle passes through the sealed sampling port mechanism downward, it can overcome the elastic force of the first torsion spring (12) and the second torsion spring (13) to push the arc plate (10) and the fan plate (11) open and enter the test tube in the cover (2).
2. The test tube box for a gas chromatograph with a sealed cap according to claim 1, characterized in that: A first baffle (14) is provided on the cover (2) located on the upper side of the arc plate (10). A second baffle (15) is provided at the end of the arc plate (10) located below the fan plate (11). When the first torsion spring (12) drives the arc plate (10) to rotate until it contacts the first baffle (14), the arc plate (10) and the cover (2) are flush. When the second torsion spring (13) drives the fan plate (11) to rotate until it contacts the second baffle (15), the fan plate (11) and the arc plate (10) are flush.
3. A test tube box for a gas chromatograph with a sealed cap according to claim 1, characterized in that: The bottom surface of the arc plate (10) is provided with a first elastic sealing sheet (16), and the first elastic sealing sheets (16) at the bottom of adjacent arc plates (10) are arranged overlappingly. The bottom surface of the fan plate (11) is provided with a second elastic sealing sheet (17), and the second elastic sealing sheets (17) at the bottom of adjacent fan plates (11) are arranged overlappingly. When the arc plate (10) and the fan plate (11) are rotated to be flush with the cover (2), the first elastic sealing sheet (16) and the second elastic sealing sheet (17) can block and close the inlet of the sealing sampling port mechanism.
4. A test tube box for a gas chromatograph with a sealed cap according to claim 1, characterized in that: The heater (5) and cooler (6) are located at one end of the length of the temperature control cavity (4). A fan (18) is also installed on one side of the heater (5) and cooler (6). Ventilation holes (19) are provided between adjacent slots (3). The ventilation holes (19) connect the temperature control cavity (4) with the internal space of the cover (2).
5. A test tube box for a gas chromatograph with a sealed cap according to claim 1, characterized in that: The bottom of the cover (2) is provided with a plug (20), and the outer periphery of the top surface of the tray (1) is provided with a slot (21) that cooperates with the plug (20). A horizontally arranged sealing ring (22) is also provided on the outside of the plug (20). A sealing protrusion (23) is provided at the bottom of the sealing ring (22). A sealing ring groove (24) that cooperates with the sealing protrusion (23) is opened on the top surface of the tray (1) outside the slot (21).