A gas sampling device for ion mobility spectrometry

Abstract

The application provides an injection type gas sampling device applied to ion mobility spectrometry, which can collect gas samples on line and then sample under positive pressure, and a mobility tube working under positive pressure reduces the influence of environmental pressure and pump state. The device can adjust the sampling and sampling frequency by adjusting the rotating speed of a motor, and can realize multiple sampling and sampling, multiple sampling and sampling, and multiple sampling and sampling, and the like, and can realize sample addition, mixing, dilution and reaction, and the like, thereby providing more new ideas for ion mobility spectrometry application research. The device can effectively reduce sample adsorption and residue through a heating system, and is suitable for various gas sampling and sampling occasions such as environmental gas and food safety. The device samples and samples under the positive pressure working condition of the mobility tube, and has the characteristics of simple operation, less residue, high sampling efficiency, and multiple sampling and sampling modes.

Description

Technical Field

[0001] This invention relates to the technical field of gas sampling, and more particularly to an injection-type gas sampling device for use in ion mobility spectrometry. Background Technology

[0002] Ion mobility spectrometry (IMS) is an analytical technique that uses the differences in the mobility of gaseous ions to qualitatively and quantitatively identify different chemical substances, achieving the purpose of analyzing and determining various substances. It operates at atmospheric pressure and is characterized by its fast analysis speed, high sensitivity, low cost, and ease of operation, making it suitable for trace detection of some volatile substances. Ion mobility spectrometry has mature applications in explosives and related fields. With the development of high-performance ion mobility spectrometry, its application scope is gradually expanding to fields such as environmental monitoring.

[0003] When ion mobility spectrometry (IMS) is applied to environmental monitoring, the sample introduction method often limits detection efficiency and sensitivity. Generally, IMS uses negative pressure sample introduction in environmental monitoring. Because the migration tube operates under negative pressure, high requirements are placed on its sealing performance. If sample introduction is continuous without interval cleaning of the migration tube, sample residue and tube contamination will occur. If intermittent sample introduction is achieved by switching the gas path via a valve, pressure fluctuations within the migration tube during valve switching will affect signal stability.

[0004] One published patent, a handheld air sampling device for factories (CN201922099109.6), uses an injection principle to collect air samples from higher positions, allowing workers to sample and test the air without needing to be at a high position. However, this device only performs sampling and does not involve the sample injection process. Another published patent, a sealed sampling device (CN202916136U), includes a sealed sampler and a sampling syringe, effectively preventing media leakage, with a long service life, resistance to damage, and good safety. However, this patent requires manual sampling.

[0005] To enable gas sample collection and injection using a positive pressure migration tube, an injection-type gas sampling device is designed, which can achieve efficient sampling and injection without changing the operating conditions of the migration tube. Summary of the Invention

[0006] In view of the technical problems mentioned in the background section, an injection-type gas sampling device for ion mobility spectrometry is provided. This invention solves the problem of how to sample and inject gas samples when the ion mobility tube is operating under positive pressure, achieving low-loss, high-efficiency sampling and injection, and multiple sampling and injection methods. The technical means employed in this invention are as follows:

[0007] An injection-type gas sampling device for ion mobility spectrometry includes: a motor, a support, a cam, a connecting rod, a push rod, an injection cylinder, a heating jacket, a piston, a three-way valve, a one-way valve I, a one-way valve II, and an ion mobility tube;

[0008] The motor is located at the lower end of the support; the cam is mounted on the motor; the cam is connected to the connecting rod; the syringe is located on the right outer side of the support; a piston is located inside the syringe; the piston is connected to the push rod, and the push rod is connected to the connecting rod; one end of the syringe outlet is connected to any one port of the three-way valve; the other two ports of the three-way valve are respectively connected to one-way valve I and one-way valve II to achieve gas switching; one-way valve II is connected to the ion migration tube; the syringe is wrapped with a heating jacket to maintain a constant temperature.

[0009] The motor rotates, causing the cam to rotate, and the cam drives the connecting rod and the push rod to move, thereby realizing the reciprocating motion of the piston inside the injection cylinder;

[0010] When the piston draws air, the one-way valve I opens and the one-way valve II closes, allowing gas to enter the syringe through the one-way valve I for sampling. When the piston extends, the one-way valve II opens and the one-way valve I closes, allowing gas to exit the syringe through the three-way valve and the one-way valve II in sequence for injection.

[0011] Furthermore, the bracket is an L-shaped bracket.

[0012] Furthermore, the air supplied by the one-way valve I and the one-way valve II is opposite.

[0013] Furthermore, the one-way valve I is connected to the injection port; a filter element is provided at the injection port to achieve gas filtration and injection; the one-way valve II is connected to the carrier gas in the migration tube to achieve sample injection into the carrier gas in the migration tube.

[0014] Furthermore, the ion migration tube has two inlets and one outlet, namely, a drift gas inlet, a carrier gas inlet, and an outlet outlet.

[0015] Furthermore, the one-way valve II injects gas into the ion migration tube or injects gas into the ion migration tube together with the carrier gas.

[0016] Furthermore, the ion migration tube enables gas sampling and analysis when operating under positive pressure.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention proposes an injection-type gas sampling device for ion mobility spectrometry (IMS). It can collect gas samples online and then inject them under positive pressure. The positive pressure operation of the migration tube reduces the impact of environmental pressure and pump status. The device can adjust the sampling and injection frequency by regulating the motor speed, and can also achieve multiple sampling with a single injection, single sampling with multiple injections, or multiple sampling with multiple injections. It facilitates operations such as sample addition, mixing, dilution, or reaction, providing more new ideas for IMS application research.

[0019] This device effectively reduces sample adsorption and residue through its heating system, making it suitable for various gas sampling and injection applications, including environmental gases and food safety. Operating under positive pressure in the migration tube, the device features simple operation, low residue, high sampling efficiency, and multiple sampling and injection methods. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an injection-type gas sampling device for ion mobility spectrometry according to the present invention.

[0022] In the diagram, 1 is the motor; 2 is the bracket; 3 is the cam; 4 is the connecting rod; 5 is the push rod; 6 is the syringe; 7 is the heating jacket; 8 is the piston; 9 is the three-way valve; 10 is the one-way valve I; 11 is the sample inlet; 12 is the filter element; 13 is the one-way valve II; 14 is the ion migration tube; 15 is the carrier gas; 16 is the drift gas; and 17 is the gas outlet. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] like Figure 1 As shown, the present invention provides an injection-type gas sampling device for ion mobility spectrometry, comprising:

[0026] 1. Motor; 2. Bracket; 3. Cam; 4. Connecting rod; 5. Push rod; 6. Injector; 7. Heating jacket; 8. Piston; 9. Three-way valve; 10. Check valve I; 13. Check valve II; and 14. Ion migration tube.

[0027] The motor 1 is located at the lower end of the support 2; the cam 3 is mounted on the motor 1; the cam 3 is connected to the connecting rod 4; the injection cylinder 6 is located on the right outer side of the support 2; a piston 8 is located inside the injection cylinder 6; the piston 8 is connected to the push rod 5, and the push rod 5 is connected to the connecting rod 4; one end outlet of the injection cylinder 6 is connected to any one port of the three-way valve 9; the other two ports of the three-way valve 9 are respectively connected to one-way valve I10 and one-way valve II13 to realize gas switching; the one-way valve II13 is connected to the ion migration tube 14; the injection cylinder 6 is wrapped with a heating jacket 7 to keep the injection cylinder 6 at a constant temperature;

[0028] The rotation of the motor 1 drives the cam 3 to rotate, and the cam 3 drives the connecting rod 4 and the push rod 5 to move, thereby realizing the reciprocating motion of the piston 8 in the injection cylinder 6;

[0029] When the piston 8 draws gas, the one-way valve I10 opens and the one-way valve II13 closes, allowing gas to enter the syringe 6 through the one-way valve I10 for sampling. When the piston 8 pushes out, the one-way valve II13 opens and the one-way valve I10 closes, allowing gas to exit the syringe 6 through the three-way valve 9 and the one-way valve II13 in sequence for injection.

[0030] In a preferred embodiment, the bracket 2 is an L-shaped bracket. The air supplied by the one-way valve I10 and the one-way valve II13 is opposite.

[0031] Preferably, the one-way valve I10 is connected to the injection port 11; a filter element 12 is provided at the injection port 11 to achieve gas filtration and injection; the one-way valve II13 is connected to the carrier gas 15 of the migration tube to achieve sample injection into the carrier gas 15 of the migration tube.

[0032] Preferably, the ion migration tube 14 has two inlets and one outlet, namely, a drift gas 16, a carrier gas 15, and an outlet 17.

[0033] In this embodiment, the one-way valve II13 injects gas into the ion migration tube 14 or injects gas into the ion migration tube 14 together with the carrier gas 15.

[0034] Preferably, the ion migration tube 14 performs gas sampling and analysis under positive pressure.

[0035] In this application, the filter element 12 is selected according to the actual situation. The motor 1 can be a DC motor or a stepper motor. When the motor 1 is a stepper motor, the piston 8 can be controlled to perform multiple samplings with a single injection, completing the mixed injection of different samples. It can also achieve multiple injections with a single sampling, thereby reducing the number of samplings, or multiple sampling and injection methods. If the motor 1 is a DC motor, the motor speed can be controlled to adjust the sampling injection frequency, achieving intermittent continuous sampling injection, and thus realizing quasi-continuous monitoring and analysis.

[0036] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0037] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0038] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0039] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0040] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0041] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection-type gas sampling device for ion mobility spectrometry, characterized in that, include: Motor (1), bracket (2), cam (3), connecting rod (4), push rod (5), syringe (6), heating jacket (7), piston (8), three-way valve (9), one-way valve I (10), one-way valve II (13), and ion migration tube (14); The motor (1) is located at the lower end of the bracket (2); the cam (3) is located on the motor (1); the cam (3) is connected to the connecting rod (4); the syringe (6) is located on the right outer side of the bracket (2); a piston (8) is located inside the syringe (6); the piston (8) is connected to the push rod (5), and the push rod (5) is connected to the connecting rod (4); one end outlet of the syringe (6) is connected to any one port of the three-way valve (9); the other two ports of the three-way valve (9) are respectively connected to one-way valve I (10) and one-way valve II (13) to realize gas switching; the one-way valve II (13) is connected to the ion migration tube (14); the syringe (6) is wrapped with a heating jacket (7) to keep the syringe (6) at a constant temperature; The motor (1) rotates and drives the cam (3) to rotate. The cam (3) drives the connecting rod (4) and the push rod (5) to move, thereby realizing the reciprocating motion of the piston (8) in the injection cylinder (6). When the piston (8) draws gas, the one-way valve I (10) opens and the one-way valve II (13) closes, and the gas enters the syringe (6) through the one-way valve I (10) to achieve sampling; when the piston (8) pushes out, the one-way valve II (13) opens and the one-way valve I (10) closes, and the gas is pushed out of the syringe (6) through the three-way valve (9) and the one-way valve II (13) in sequence to achieve sample injection.

2. The injection-type gas sampling device for ion mobility spectrometry according to claim 1, characterized in that, The bracket (2) is an L-shaped bracket.

3. The injection-type gas sampling device for ion mobility spectrometry according to claim 1, characterized in that, The air supplied by the one-way valve I (10) and the one-way valve II (13) is opposite.

4. An injection-type gas sampling device for ion mobility spectrometry according to claim 1 or 3, characterized in that, The one-way valve I (10) is connected to the injection port (11); a filter element (12) is provided at the injection port (11) to achieve gas filtration and injection; The one-way valve II (13) is connected to the carrier gas in the migration tube (15) to realize the injection of the sample into the carrier gas in the migration tube (15).

5. The injection-type gas sampling device for ion mobility spectrometry according to claim 1, characterized in that, The ion migration tube (14) has two inlets and one outlet, namely drift gas (16), carrier gas (15) and outlet (17).

6. The injection-type gas sampling device for ion mobility spectrometry according to claim 1, characterized in that, The one-way valve II (13) injects gas into the ion migration tube (14) or injects gas into the ion migration tube (14) together with the carrier gas (15).

7. An injection-type gas sampling device for ion mobility spectrometry according to claim 1, 5, or 6, characterized in that, The ion migration tube (14) enables gas sampling and analysis under positive pressure.

Images