Sample feeding device for measuring stable isotope value of gas

Abstract

The utility model relates to the technical field of gas transfer, and provides a sample introduction device for gas stable isotope value measurement, which comprises a containing tank with a containing space and a plurality of communicating pipes communicated with the containing space; the high-concentration gas injection pipe is arranged on the containing tank and communicated with the containing space, and high-concentration detection gas can enter the containing space through the high-concentration gas injection pipe. By means of the technical scheme, the technical problems that when a gas pre-concentration device is used in the prior art, gas cannot be directly supplied for high-concentration gas, the high-concentration gas can only be detected after being diluted in advance, the detection cost is increased, and the detection result has errors are solved.

Description

Technical Field

[0001] The embodiments of this disclosure relate to the field of gas transport technology, and more specifically, to a sample introduction device for measuring stable gas isotope values. Background Technology

[0002] Precon is a trace gas pre-concentration device manufactured by Thermo Fisher Scientific. It is specifically designed for the pretreatment of gas samples, collecting and concentrating small amounts of gas, significantly reducing the amount of gas sample injected. It is primarily used for CH4 and N2O containing ¹³C, ¹³C, and ¹³C. 5 N、¹ 8 O isotope testing pretreatment. This was achieved by measuring δ¹⁸. 5 N and δ¹ 8 O isotope ratios can be used for nitrogen source tracing studies; by analyzing¹ 5 N and ¹ 8 The fractionation characteristics of O isotopes allow for the analysis of nitrogen conversion pathways. Designed for measuring carbon and nitrogen isotope values ​​in samples with low concentrations of methane and nitrous oxide, the gas transfer device is 100 ml in volume. A 100 ml sample provides a suitable measurement signal. For high concentrations (several thousand ppm) or pure gases, filling the sample with 100 ml would result in a measurement signal far exceeding the instrument's measurement limits.

[0003] In actual use, if the original device is used to measure high-concentration samples, the high-concentration gas samples can only be diluted in advance with high-purity helium, but this requires a lot of gas, resulting in sample waste. At the same time, this process may also introduce impurities, affecting the detection results. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a sample injection device for measuring stable gas isotope values, which solves the technical problem that when using gas pre-concentration devices in the prior art, high-concentration gases cannot be directly supplied and need to be diluted in advance before detection, which leads to increased detection costs and errors in detection results.

[0005] According to one aspect, at least one embodiment of this disclosure provides a sample introduction apparatus for measuring gas stable isotope values, comprising:

[0006] A container tank having a receiving space and a plurality of connecting pipes communicating with the receiving space;

[0007] A high-concentration gas injection pipe is installed on the container and communicates with the container space, allowing high-concentration detection gas to enter the container space through the high-concentration gas injection pipe.

[0008] For example, a sample introduction device for measuring gas stable isotope values ​​provided in at least one embodiment of this disclosure further includes:

[0009] A rubber stopper is detachably mounted on the high-concentration gas injection tube, and the rubber stopper is configured to seal the high-concentration gas injection tube after installation.

[0010] A fastening sleeve is detachably mounted on the high-concentration gas injection tube. After installation, the fastening sleeve forms a clamping space with the high-concentration gas injection tube, and the clamping space is used to clamp the rubber stopper.

[0011] For example, in a sample injection device for measuring gas stable isotope values ​​provided in at least one embodiment of this disclosure, the top of the fastening sleeve has an opening, and it further includes:

[0012] A leak-proof sleeve is fitted onto the fastening sleeve. The leak-proof sleeve has a leak-proof space, and the opening is located within the leak-proof space. The leak-proof sleeve is used to prevent the rubber stopper from leaking and causing gas to escape from the opening.

[0013] A needle is disposed inside the leak-proof sleeve and facing the rubber stopper. The needle is configured to slide through the opening and the rubber stopper into the receiving space. The needle is used to inject the gas to be tested into the receiving space.

[0014] For example, a sample introduction device for measuring gas stable isotope values ​​provided in at least one embodiment of this disclosure further includes:

[0015] An intake branch is located on the wall of the connecting pipe and is connected to the connecting pipe. The intake branch is used to inject gas into the accommodating space.

[0016] A rotary piston is rotatably mounted on the connecting pipe, and the rotary piston is configured to open or close the intake branch after rotation.

[0017] For example, a sample introduction device for measuring gas stable isotope values ​​provided in at least one embodiment of this disclosure further includes:

[0018] A plurality of stabilizing supports are fitted onto the container, the stabilizing supports having stabilizing planes configured to contact other planes to keep the container stable.

[0019] For example, a sample introduction device for measuring gas stable isotope values ​​provided in at least one embodiment of this disclosure further includes:

[0020] The movable outriggers are arranged in a plurality of rotatable configurations on the stabilizing bracket. The movable outriggers are configured to open or close after rotation and are used to support the stabilizing bracket.

[0021] For example, in a sample injection device for measuring the stable isotope value of a gas provided in at least one embodiment of this disclosure, a limiting rod is provided on the movable leg, and the limiting rod is used to limit the opening angle of the movable leg.

[0022] For example, in a sample injection device for measuring stable gas isotope values ​​provided in at least one embodiment of this disclosure, the high-concentration gas injection tube has threads, and the fastening sleeve is connected to the high-concentration gas injection tube through the threads.

[0023] For example, in a sample injection device for measuring the stable isotope value of a gas provided in at least one embodiment of this disclosure, the needle is detachable.

[0024] For example, in a sample injection device for measuring the stable isotope value of a gas provided in at least one embodiment of this disclosure, the leak-proof sleeve is ellipsoidal and elastic.

[0025] The beneficial effects of the embodiments disclosed herein are as follows:

[0026] This disclosure describes a device that directly processes high-concentration gas samples, eliminating the need for pre-dilution with large amounts of high-purity helium as in traditional methods. This reduces gas consumption and sample waste. Simultaneously, it eliminates the intermediate dilution process, lowering the risk of impurity introduction and improving the accuracy of test results. The combination of a rubber stopper and a fastening sleeve significantly enhances the sealing performance of the high-concentration gas injection tube, effectively preventing gas leakage and the entry of external impurities. This ensures the purity and stability of the gas within the container, providing a reliable guarantee for accurate gas isotope value measurements. The reliable sealing design reduces safety risks that may arise from gas leaks, such as the explosion hazard caused by leaks of flammable and explosive gases, and the health hazards to operators from leaks of toxic gases. The device ensures the safety of operators and the surrounding environment during operation and storage. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0028] Figure 1 This is a schematic diagram of a sample injection device for measuring the stable isotope value of a gas in one embodiment of the present disclosure.

[0029] Figure 2 This is a schematic diagram of the internal structure of this disclosure;

[0030] Figure 3 For this disclosure Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0031] Figure 4 For this disclosure Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0032] In the diagram: 100, container; 110, container space; 200, connecting pipe; 300, high-concentration gas injection pipe; 410, rubber stopper; 420, fastening sleeve; 421, clamping space; 422, opening; 430, leak-proof sleeve; 431, leak-proof space; 440, needle; 210, air inlet branch; 220, rotating piston; 510, stabilizing bracket; 511, stabilizing plane; 520, movable support leg; 530, limiting rod. Detailed Implementation

[0033] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0034] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0035] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0036] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0038] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] like Figures 1-4 The diagram illustrates a sample introduction device for measuring stable gas isotope values ​​according to an embodiment of this disclosure. The device includes a container 100, whose containing space 110 is used to store and mix gases from different sources. The container 100 must consider gas storage safety, mixing uniformity, and ease of connection with other components. By providing several connecting pipes 200 connected to the containing space 110, multiple gases can be introduced simultaneously, providing conditions for gas mixing and processing. Furthermore, the material and structure of the container 100 must be able to withstand a certain pressure to ensure that no leakage occurs during gas injection and storage.

[0040] The container 100 provides a stable space for storing and mixing gases, facilitating the proper handling of high-concentration gas samples. Several connecting tubes 200 allow different gases to easily enter the container 100. A high-concentration gas injection tube 300 is directly connected to the container space 110 of the container 100, providing a dedicated entry channel for high-concentration detection gases. When high-concentration gas needs to be detected, a small amount of gas can be directly injected through the high-concentration gas injection tube 300, eliminating the need for dilution and saving costs.

[0041] This device directly processes high-concentration gas samples, eliminating the need for pre-dilution with large amounts of high-purity helium as in traditional methods. This reduces gas consumption and sample waste. Furthermore, the elimination of intermediate dilution processes lowers the risk of impurity introduction and improves the accuracy of detection results.

[0042] In some examples, a rubber stopper 410 is detachably mounted on the high-concentration gas injection pipe 300. Its main function is to tightly seal the injection pipe when it is not in use, preventing outside air from entering the container 100 and avoiding gas leakage within the container 100. The rubber stopper 410 is typically made of an elastic material, utilizing its elastic deformation capability to fit tightly against the inner wall of the injection pipe during installation, forming a good seal. The rubber stopper 410 provides a reliable seal for the high-concentration gas injection pipe 300, helping to maintain the purity and pressure stability of the gas within the container 100. It prevents external impurities from entering and internal gas from escaping when the device is idle or undergoing other operations, thus improving the safety of the device. A fastening sleeve 420 is also detachably mounted on the high-concentration gas injection pipe 300, further enhancing the sealing effect of the rubber stopper 410. After the fastening sleeve 420 is installed, a clamping space 421 is formed between it and the high-concentration gas injection pipe 300. By clamping the rubber stopper 410 in this space, the rubber stopper 410 is prevented from loosening and falling off due to internal pressure changes or external vibrations, thereby ensuring that the rubber stopper 410 is always in close contact with the injection pipe and maintaining a good sealing state.

[0043] The combination of the rubber stopper 410 and the fastening sleeve 420 significantly improves the sealing performance of the high-concentration gas injection pipe 300, effectively preventing gas leakage and the entry of external impurities. This ensures the purity and stability of the gas within the containment tank 100, providing a reliable guarantee for accurate gas isotope value measurement. The reliable sealing design reduces safety risks that may arise from gas leaks, such as the explosion hazard caused by leaks of flammable and explosive gases, and the health hazards to operators from leaks of toxic gases. It ensures the safety of operators and the surrounding environment during the operation and storage of the device.

[0044] In some examples, a leak-proof sleeve 430 is positioned on the fastening sleeve 420, utilizing its elastic properties to seal any potential gas leaks around the rubber stopper 410. When the rubber stopper 410 experiences minor leakage due to aging, pressure changes, or other reasons, the leak-proof sleeve 430, in addition to the fastening sleeve 420, further prevents gas from escaping into the external environment, thereby improving the overall sealing and safety of the device. The leak-proof sleeve 430 provides an additional safety layer for the device, effectively reducing the risk of gas leakage due to incomplete sealing of the rubber stopper 410, ensuring the safety of operators and preventing contamination of the surrounding environment. Simultaneously, this also helps maintain the stability of the gas composition within the containment tank 100, ensuring the accuracy of measurement results. The needle 440 is positioned inside the leak-proof sleeve 430 and faces the rubber stopper 410, and can slide through the opening 422 at the top of the fastening sleeve 420 and the rubber stopper 410 to enter the containment space 110. This design provides a direct, high-concentration gas injection method, avoiding gas loss or uneven injection problems that may occur with traditional injection methods. The sliding design of the needle 440 allows it to be stored in the leak-proof sleeve 430 when not in use, protecting the needle 440 and preventing accidental punctures to operators, while allowing it to be easily extended for gas injection operations when in use.

[0045] The needle 440 design enables precise injection of high-concentration gases, allowing for more accurate control of the injection volume and speed, thus contributing to more accurate measurement results. This is crucial for gas isotope value measurements, which require precise control over gas composition and concentration, thereby improving the reliability and scientific rigor of the measurement. The addition of the leak-proof sleeve 430 further enhances the safety of the device, effectively preventing potential gas leakage at the rubber stopper 410, protecting the health of operators and the surrounding environment.

[0046] In some examples, the intake branch 210 is located on and connected to the connecting pipe 200, providing the accommodating space 110 with an additional gas injection channel besides the main connecting pipe 200. This design increases the flexibility of gas injection, allowing for the use of a valve as a further technical solution. By rotating the piston 220, its relative position to the intake branch 210 can be changed, thereby controlling the opening and closing of the gas passage in the intake branch 210. This design is simple to operate, can control the inflow of gas, and the rotating piston 220 has good sealing performance, effectively preventing gas leakage.

[0047] Multiple stabilizing supports 510 are mounted on the container 100, and their stabilizing planes 511 can contact other planes such as experimental benches to form a stable support structure. This design utilizes the stability principle of planar contact, increasing the support points and contact area to evenly distribute the weight of the container 100, reducing single-point stress, and thus improving the stability of the container 100 during various operations. The design of the stabilizing supports 510 takes into account different usage scenarios and experimental equipment. Its stabilizing planes 511 can adapt to various types of support planes, whether it is a common laboratory bench or a mounting platform for specific measuring instruments, ensuring the versatility and wide applicability of the device.

[0048] In some examples, the movable support leg 520 can rotate on the stabilizing support 510, enabling opening and closing actions. When the device is placed on an uneven surface, rotating the movable support leg 520 to open it increases the contact point and support area with the surface, distributing the weight of the container 100 and thus improving the stability of the device. When it is necessary to move the device or when storage space is limited, the movable support leg 520 can be rotated to close, reducing the space occupied and facilitating the handling and storage of the device. The adjustable nature of the movable support leg 520 allows the device to adapt to various complex placement environments, ensuring stable operation in different scenarios such as inside the laboratory or in the field, expanding the applicability of the device and meeting the needs of different users and different working scenarios.

[0049] In some examples, a limiting rod 530 is mounted on the movable leg 520, its main function being to limit the opening angle of the movable leg 520. By setting a specific opening angle range, it ensures that the movable leg 520, while providing support, can adapt to the unevenness of different placement surfaces without affecting the stability of the device due to excessively large or small opening angles. The limiting rod 530, the movable leg 520, and the stabilizing bracket 510 form a mechanical limiting structure. When the movable leg 520 rotates to the set angle, the limiting rod 530 contacts the stabilizing bracket 510 or other fixed components, preventing the movable leg 520 from continuing to rotate. A suitable opening angle is crucial for the stability of the device. The limiting rod 530 ensures the consistency of the opening angle of the movable leg 520 each time it opens.

[0050] In some examples, threads are machined into the high-concentration gas injection tube 300, and a matching internal thread is provided on the inner wall of the fastening sleeve 420. The fastening sleeve 420 is installed on the high-concentration gas injection tube 300 via a threaded connection. The threaded connection utilizes the helix angle of the thread and the principle of friction. When the fastening sleeve 420 is rotated, the helical structure of the thread causes the fastening sleeve 420 to move axially along the high-concentration gas injection tube 300, thereby achieving the clamping or loosening operation of the rubber stopper 410. This connection method provides reliable clamping force, ensuring that the rubber stopper 410 remains tightly sealed during device operation, preventing gas leakage. The needle 440 is detachable and connects to the leak-proof sleeve 430 or related components via a specific connection structure. This design allows the needle 440 to be easily removed for cleaning, repair, or replacement when it becomes clogged, damaged, or needs to be replaced with a different specification needle 440, without requiring complex disassembly and maintenance of the entire device. The connection structure of the detachable needle 440 must ensure the connection is secure to prevent the needle 440 from falling off during gas injection, while also facilitating disassembly and installation by the operator.

[0051] In practical use, the rubber stopper 410 is first installed on the high-concentration gas injection tube 300. Then, the fastening sleeve 420 is installed on the high-concentration gas injection tube 300 via a threaded connection. The fastening sleeve 420 is rotated to move along the threads and clamp the rubber stopper 410, ensuring a seal between the rubber stopper 410 and the high-concentration gas injection tube 300. The tight threaded connection between the fastening sleeve 420 and the high-concentration gas injection tube 300, along with the reliable connection of the needle 440, ensures that there will be no gas leakage or needle 440 detachment during gas injection. During device use, if the needle 440 becomes clogged or damaged, or if a different specification needle 440 needs to be replaced, for threaded needles 440, use a suitable tool to rotate the needle 440 to unscrew it from the leak-proof sleeve 430 or connecting component; for snap-fit ​​needles 440, press or rotate the snap-fit ​​structure according to the operating instructions to separate the needle 440 from the connecting component; for quick-connect needles 440, press the unlock button or operate the corresponding unlocking mechanism to pull out the needle 440. Then, install the new needle 440 or the cleaned and repaired needle 440 onto the device in reverse order. During long-term use of the device, the needle 440 can also be periodically disassembled for cleaning and disinfection to ensure the purity of the injected gas.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A sample introduction device for measuring the stable isotope values ​​of gases, characterized in that, include: The container (100) has a receiving space (110) and a plurality of connecting pipes (200) communicating with the receiving space (110). A high-concentration gas injection pipe (300) is installed on the container (100) and communicates with the container space (110), allowing high-concentration detection gas to enter the container space (110) through the high-concentration gas injection pipe (300).

2. The sample introduction device for measuring gas stable isotope values ​​according to claim 1, characterized in that, Also includes: A rubber stopper (410) is detachably mounted on the high-concentration gas injection tube (300), and the rubber stopper (410) is configured to seal the high-concentration gas injection tube (300) after installation. A fastening sleeve (420) is detachably mounted on the high-concentration gas injection tube (300). After installation, the fastening sleeve (420) forms a clamping space (421) with the high-concentration gas injection tube (300). The clamping space (421) is used to clamp the rubber stopper (410).

3. The sample introduction device for measuring gas stable isotope values ​​according to claim 2, characterized in that, The fastening sleeve (420) has an opening (422) at the top and also includes: A leak-proof sleeve (430) is fitted onto the fastening sleeve (420). The leak-proof sleeve (430) has a leak-proof space (431), and the opening (422) is located within the leak-proof space (431). The leak-proof sleeve (430) is used to prevent the rubber stopper (410) from leaking, causing gas to escape from the opening (422). A needle (440) is disposed inside the leak-proof sleeve (430) and facing the rubber stopper (410). The needle (440) is configured to slide through the opening (422) and the rubber stopper (410) into the receiving space (110). The needle (440) is used to inject the gas to be tested into the receiving space (110).

4. The sample introduction device for measuring gas stable isotope values ​​according to claim 1, characterized in that, Also includes: An intake branch (210) is located on the wall of the connecting pipe (200) and connected to the connecting pipe (200). The intake branch (210) is used to inject gas into the accommodating space (110). A rotary piston (220) is rotatably and slidably disposed on the connecting pipe (200), and the rotary piston (220) is configured to open or close the intake branch (210) after rotating or sliding.

5. The sample introduction device for measuring gas stable isotope values ​​according to claim 1, characterized in that, Also includes: A plurality of stabilizing supports (510) are fitted onto the container (100). The stabilizing supports (510) have stabilizing planes (511) configured to contact other planes to keep the container (100) stable.

6. The sample introduction device for measuring gas stable isotope values ​​according to claim 5, characterized in that, Also includes: A plurality of movable legs (520) are rotatably mounted on the stabilizing bracket (510). The movable legs (520) are configured to open or close after rotation. The movable legs (520) are used to support the stabilizing bracket (510).

7. A sample introduction device for measuring gas stable isotope values ​​according to claim 6, characterized in that, The movable support leg (520) is provided with a limiting rod (530), which is used to limit the opening angle of the movable support leg (520).

8. A sample introduction device for measuring gas stable isotope values ​​according to claim 2, characterized in that, The high-concentration gas injection pipe (300) has threads, and the fastening sleeve (420) is connected to the high-concentration gas injection pipe (300) by the threads.

9. A sample introduction device for measuring gas stable isotope values ​​according to claim 3, characterized in that, The needle (440) is detachable.

10. A sample introduction device for measuring gas stable isotope values ​​according to claim 3, characterized in that, The leak-proof sleeve (430) is ellipsoidal and elastic.

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