A gas collecting apparatus with gas detection function

Abstract

The present application belongs to the technical field of biomedical engineering industry, especially a gas collection device with gas detection function, aiming at the problems of low concentration precision, poor detection stability, incomplete cleaning, poor sampling convenience of the existing gas collection and detection device, the present application proposes the following scheme, which comprises a carbon fiber cavity, one end of the carbon fiber cavity is communicated with an inlet pipe, the inlet pipe is communicated with a sterile sampling port unit, the other end of the carbon fiber cavity is communicated with a plugging cover: an intelligent control unit is arranged in the inside of the carbon fiber cavity, close to the position of the inlet pipe; a micro multi-pass cell unit is arranged in the inside of the carbon fiber cavity, one end of the micro multi-pass cell unit is communicated with a conical flow guide cylinder. The present application realizes concentration self-adaptive concentration through the intelligent control unit, improves the detection sensitivity of low concentration sample; through the cooperative detection of multiple sensors and the dynamic calibration mechanism, the accuracy of the detection result is ensured.

Description

Technical Field

[0001] This invention relates to the field of biomedical engineering technology, and in particular to a gas collection device with gas detection function. Background Technology

[0002] In fields such as medical diagnosis, environmental monitoring, and industrial gas analysis, gas detection and collection equipment is one of the core tools, and its performance directly affects the accuracy and reliability of the detection results.

[0003] With the development of breath diagnostic technology, characteristic VOCs in human exhaled gas (such as Helicobacter pylori-related ammonia and diabetes-related acetone) have become important biomarkers for non-invasive diagnosis. However, existing gas collection and detection equipment suffers from the following unresolved technical limitations: Existing equipment mostly uses fixed volume chambers, which cannot adaptively adjust the volume according to the gas concentration to achieve accurate concentration. Low-concentration gas samples have insufficient detection sensitivity, while high-concentration samples are prone to sensor saturation, affecting detection accuracy. Single-sensor detection is susceptible to cross-interference, lacks a multi-sensor collaborative verification mechanism, and does not have a dynamic calibration function. After long-term use, sensor drift will lead to distorted detection results. After testing, residual gas samples in the gas channel can easily contaminate subsequent tests. Existing cleaning facilities are mostly single-channel cleaning systems, which have limited cleaning range and low cleaning efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing gas collection and detection equipment, such as low concentration accuracy, poor detection stability, incomplete cleaning, and poor sampling convenience. The invention proposes a gas collection device with gas detection function, which achieves adaptive concentration through an intelligent control unit, improving the detection sensitivity of low-concentration samples; ensures the accuracy of detection results through multi-sensor collaborative detection and dynamic calibration mechanisms; achieves thorough cleaning and avoids cross-contamination through a multi-channel inert gas cleaning unit; and improves sampling convenience and sample purity through a detachable sterile sampling structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A gas collection device with gas detection function includes a carbon fiber cavity, one end of which is connected to an inlet pipe, a sterile sampling port unit is connected to the inlet pipe, and the other end of the carbon fiber cavity is connected to a sealing cap. The intelligent control unit is located inside the carbon fiber cavity, near the inlet pipe. A miniature multi-pass cell unit is set inside the carbon fiber cavity. One end of the miniature multi-pass cell unit is connected to a conical guide tube, which is located inside the carbon fiber cavity and close to the intelligent control unit. The sensor detection unit is mounted on the carbon fiber cavity and used in conjunction with the miniature multi-pass cell unit for gas detection. An inert gas cleaning unit, located on the sealing cover, is used to backflush the miniature multi-pass cell unit.

[0006] Preferably, the intelligent control unit includes three piezoelectric ceramic actuators, all of which are mounted on the inner wall of the carbon fiber cavity. The same sealing ring is mounted on the output shaft of the three piezoelectric ceramic actuators. The sealing ring is slidably connected to the inner wall of the carbon fiber cavity, and a deformable polytetrafluoroethylene membrane is provided on the sealing ring.

[0007] Preferably, the sensor detection unit includes a controller, which is installed on the top of the carbon fiber cavity. The controller is connected to two TDLAS sensors and five QEPAS sensors, all of which are located inside the carbon fiber cavity. The controller is also connected to an intelligent control unit, which includes an MCU main control module, an AI inference module, a standard gas generation module, and a data storage module. It is equipped with a transfer learning AI model and a dynamic calibration mechanism.

[0008] Preferably, the sterile sampling port unit includes a conical air inlet, the inner side of which is provided with an internal thread, three limiting blocks are fixedly installed on the inner wall of the internal thread, a connecting air hole is provided on the conical air inlet, a filter ring is provided between the conical air inlet and the inlet pipe, a sterile filter membrane is provided on the filter ring, and a notch is provided on the inner wall of the inlet pipe, and the filter ring is placed in the notch.

[0009] Preferably, the micro multi-pass cell unit includes a reflector cylinder, and a flow guide tube is connected between the reflector cylinder and the conical flow guide cylinder. A series FBG fiber Bragg grating assembly is inclinedly arranged on the top of the reflector cylinder, and a set of reflective mirrors is arranged inside the reflector cylinder to reflect the light of the series FBG fiber Bragg grating assembly.

[0010] Preferably, the reflector tube has a circular hole, and a circular tube is connected to the circular hole. A multi-channel cell exit end is connected to the circular tube. Two first detection air tubes and five second detection air tubes are connected to the multi-channel cell exit end. A sealing plate is provided inside the carbon fiber cavity. The sealing plate is fixedly installed on the outside of the first and second detection air tubes. Two TDLAS sensors cooperate with the two first detection air tubes, and the five second detection air tubes cooperate with the five QEPAS sensors.

[0011] Preferably, an arc-shaped partition plate is fixedly installed inside the carbon fiber cavity, and the arc-shaped partition plate separates the first detection air tube from the second detection air tube.

[0012] Preferably, the inert gas cleaning unit includes a backflush pump, which is installed on the outside of the sealing cover. The backflush pump is connected to a connecting pipe, and a dispersion cylinder is connected to the connecting pipe. The dispersion cylinder is connected to two first backflush pipes and five second backflush pipes. The two first backflush pipes are matched with two first detection gas pipes, and the five second backflush pipes are matched with five second detection gas pipes.

[0013] Preferably, the sealing cap is connected to a detection outlet, which is equipped with a gas release valve, and the bottom of the inlet pipe is connected to a backflushing discharge pipe, which is equipped with a backflushing discharge valve.

[0014] The beneficial effects of the gas collection device with gas detection function described in this invention are as follows: 1. The deformable membrane is driven to move by the piezoelectric ceramic actuator of the intelligent control unit, so as to realize the adaptive adjustment of the chamber volume. Low concentration samples can be concentrated by 5-25 times, and high concentration samples avoid sensor saturation, which can adapt to the detection needs of different concentrations of gas. 2. Employs multi-sensor collaborative detection using TDLAS and QEPAS, combined with FBG optical verification and AI inference modules, to decouple cross-sensitive interference; and features a dynamic calibration mechanism to correct sensor drift in real time. 3. Multi-channel inert gas backflushing design, covering core gas channels such as inlet tube and detection gas tube, improves cleaning efficiency and avoids residual samples affecting subsequent tests; 4. The filter ring of the sterile sampling port unit can be easily replaced, the sterile filter membrane ensures the purity of the sample, and the conical air inlet design improves the convenience of sampling and is suitable for different subjects.

[0015] This invention achieves adaptive concentration through an intelligent control unit, improving the detection sensitivity of low-concentration samples; ensures the accuracy of detection results through multi-sensor collaborative detection and dynamic calibration mechanisms; achieves thorough cleaning and avoids cross-contamination through a multi-channel inert gas cleaning unit; and improves sampling convenience and sample purity through a detachable sterile sampling structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a gas collection device with gas detection function proposed in this invention; Figure 2 This is a side view of a gas collection device with gas detection function proposed in this invention. Figure 3 This is a rear view schematic diagram of a gas collection device with gas detection function proposed in this invention; Figure 4 This is a schematic diagram of the structure of the carbon fiber cavity, the sterile sampling port unit, and the inert gas cleaning unit proposed in this invention; Figure 5 This is a schematic diagram of the internal view structure proposed in this invention; Figure 6 The present invention provides a structural schematic diagram of the inert gas cleaning unit, the micro multi-pass pool unit, and the conical guide tube. Figure 7 A schematic diagram of the planar structure of the inert gas cleaning unit, the micro multi-pass pool unit, and the conical guide tube proposed in this invention; Figure 8 The present invention provides a structural schematic diagram of the sensor detection unit, the inert gas cleaning unit, the miniature multi-pass pool unit, and the conical guide tube; Figure 9 This invention presents a schematic diagram of the planar structure of the sensor detection unit, the inert gas cleaning unit, the micro multi-pass pool unit, and the conical guide tube. Figure 10 Here is a schematic diagram of the intelligent control unit proposed in this invention; Figure 11 This is a side view of the intelligent control unit proposed in this invention. Figure 12 This invention presents a schematic diagram of the sensor detection unit. Figure 13 This is a bottom-view structural diagram of the sensor detection unit proposed in this invention; Figure 14 This invention provides a structural schematic diagram of the conical guide tube, the guide pipe, and the reflector tube; Figure 15 A bottom view of the conical guide tube, guide pipe, and reflector tube proposed in this invention; Figure 16 A schematic diagram of the planar structure of the conical guide tube, guide pipe, and reflector tube proposed in this invention; Figure 17 This invention provides a structural schematic diagram of a conical air inlet and a filter ring; Figure 18 This is a side view of the conical air inlet and filter ring proposed in this invention.

[0017] In the diagram: 1. Carbon fiber cavity; 11. Inlet pipe; 111. Inlet connection thread; 12. Sealing cap; 13. Detection outlet; 131. Detection outlet valve; 14. Backflush discharge pipe; 141. Backflush discharge valve; 2. Intelligent control unit; 21. Piezoelectric ceramic actuator; 22. Sealing ring; 23. Deformable PTFE membrane; 3. Sensor detection unit; 31. Controller; 32. QEPAS sensor; 33. TDLAS sensor; 34. Intelligent control unit; 4. Aseptic sampling port unit; 41. Conical air inlet; 411. Connecting air hole; 412. Internal thread; 413. Limiting 42. Position block; 42. Filter ring; 421. Sterile filter membrane; 5. Inert gas cleaning unit; 51. Sealing ring; 52. Dispersion cylinder; 521. First backflush pipe; 522. Second backflush pipe; 53. Backflush pump; 54. Connecting pipe; 541. Backflush valve; 6. Miniature multi-channel pool unit; 61. Reflector cylinder; 62. Series FBG fiber Bragg grating assembly; 611. Circular hole; 612. Reflector group; 63. Circular tube; 64. Expansion cylinder; 641. First detection gas tube; 642. Second detection gas tube; 65. Sealing plate; 66. Arc-shaped partition plate; 7. Conical guide cylinder; 71. Guide pipe. Detailed Implementation

[0018] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments.

[0019] Example 1 Reference Figures 1-18 A gas collection device with gas detection function includes a carbon fiber cavity 1, an inlet pipe 11, a sterile sampling port unit 4, a sealing cap 12, an intelligent control unit 2, a micro multi-channel pool unit 6, a conical guide tube 7, a sensor detection unit 3, and an inert gas cleaning unit 5. The inlet tube 11 is connected to one end of the carbon fiber cavity 1, the sterile sampling port unit 4 is connected to the inlet tube 11, and the sealing cap 12 is connected to the other end of the carbon fiber cavity 1. The intelligent control unit 2 is located inside the carbon fiber cavity 1 and close to the inlet pipe 11, and is used to adaptively adjust the chamber volume according to the gas concentration to achieve gas concentration. The micro multi-pass cell unit 6 is located inside the carbon fiber cavity 1. The conical guide tube 7 is connected to one end of the micro multi-pass cell unit 6 and is located inside the carbon fiber cavity 1 near the intelligent control unit 2. It is used to introduce the concentrated gas into the micro multi-pass cell unit 6. The conical guide tube 7 is connected to one end of the micro multi-pass cell unit 6 and is used to accurately introduce the concentrated gas into the micro multi-pass cell unit 6. The micro multi-pass cell unit 6 is equipped with a mirror group 612 and a series FBG fiber Bragg grating assembly 62, which can extend the laser optical path, improve the sufficiency of gas absorption of laser energy, and thus improve the detection accuracy. The sensor detection unit 3 is disposed on the carbon fiber cavity 1 and cooperates with the micro multi-pass cell unit 6 to detect the gas composition and concentration; An inert gas cleaning unit 5 is installed on the sealing cover 12 and is used to backflush and clean the miniature multi-channel pool unit 6 and the gas channel. The carbon fiber cavity 1 is also equipped with a detection outlet 13 and a backflushing discharge pipe 14. The detection outlet 13 is equipped with a gas release valve 131, and the backflushing discharge pipe 14 is equipped with a backflushing discharge valve 141.

[0020] Specifically, the carbon fiber cavity 1 is the core load-bearing and gas-containing component. It is made of carbon fiber and has the characteristics of being lightweight and high-strength. One end of it is connected to the inlet pipe 11 for introducing gas samples, and the other end is connected to the sealing cap 12 to achieve cavity sealing.

[0021] Reference Figure 10 , Figure 11 In this embodiment, the intelligent control unit 2 includes three piezoelectric ceramic actuators 21, a sealing ring 22, and a deformable polytetrafluoroethylene membrane 23. The three piezoelectric ceramic actuators 21 are all installed on the inner wall of the carbon fiber cavity 1. The output shafts of the three piezoelectric ceramic actuators 21 are connected to the sealing ring 22. The sealing ring 22 is slidably connected to the inner wall of the carbon fiber cavity 1. The deformable polytetrafluoroethylene membrane 23 is disposed on the sealing ring 22 and can adaptively adjust the chamber volume according to the gas concentration to achieve low-concentration gas concentration and high-concentration gas anti-saturation.

[0022] Reference Figure 12 , Figure 13 In this embodiment, the sensor detection unit 3 includes a controller 31, two TDLAS sensors 33, five QEPAS sensors 32, and an intelligent control unit 34. The controller 31 is installed on the top of the carbon fiber cavity 1. The two TDLAS sensors 33 and the five QEPAS sensors 32 are all connected to the controller 31 and located inside the carbon fiber cavity 1. The intelligent control unit 34 is connected to the controller 31 and includes an MCU main control module, an AI inference module, a standard gas generation module, and a data storage module. It is equipped with a transfer learning AI model and a dynamic calibration mechanism.

[0023] Specifically, the sensor detection unit 3 includes a TDLAS sensor 33, a QEPAS sensor 32, and an intelligent control unit 34. Through multi-sensor collaborative detection and AI data processing, it achieves accurate analysis of gas composition and has dynamic calibration function.

[0024] Reference Figure 17 , Figure 18 In this embodiment, the sterile sampling port unit 4 includes a conical air inlet 41, a filter ring 42, and a sterile filter membrane 421. The conical air inlet 41 has an internal thread 412 on its inner side, and three limiting blocks 413 are fixed on the inner wall of the internal thread 412. The conical air inlet 41 has a connecting air hole 411. The filter ring 42 is disposed between the conical air inlet 41 and the inlet pipe 11, and the sterile filter membrane 421 is disposed on the filter ring 42. The inner wall of the inlet pipe 11 has a notch, and the filter ring 42 is placed in the notch.

[0025] Reference Figure 5 , Figure 7 In this embodiment, the miniature multi-pass cell unit 6 includes a reflector cylinder 61, a series FBG fiber Bragg grating assembly 62, a mirror group 612, a circular tube 63, a multi-pass cell emission end 64, two first detection air tubes 641, five second detection air tubes 642, a sealing plate 65, and an arc-shaped partition plate 66. The reflector cylinder 61 is connected to the conical guide cylinder 7 through a guide tube 71. The series FBG fiber Bragg grating assembly 62 is inclinedly disposed on the top of the reflector cylinder 61. The mirror group 612 is disposed inside the reflector cylinder 61 and is used to reflect the laser emitted by the series FBG fiber Bragg grating assembly 62.

[0026] Reference Figure 5 , Figure 7 In this embodiment, a circular hole 611 is provided on the reflector cylinder 61. The circular hole 611 is connected to the multi-channel cell exit end 64 through a circular tube 63. Two first detection air tubes 641 and five second detection air tubes 642 are all connected to the multi-channel cell exit end 64. A sealing plate 65 is fixed inside the carbon fiber cavity 1 and located outside the first detection air tubes 641 and the second detection air tubes 642. An arc-shaped partition plate 66 is fixed inside the carbon fiber cavity 1 and is used to separate the first detection air tubes 641 and the second detection air tubes 642. Two TDLAS sensors 33 cooperate with the two first detection air tubes 641, and five second detection air tubes 642 cooperate with five QEPAS sensors 32.

[0027] Reference Figure 7 In this embodiment, the inert gas cleaning unit 5 includes a backflush pump 53, a connecting pipe 54, a dispersion cylinder 52, two first backflush pipes 521, and five second backflush pipes 522. The backflush pump 53 is installed on the outside of the sealing cover 12. The backflush pump 53 is connected to the dispersion cylinder 52 through the connecting pipe 54. The two first backflush pipes 521 and the five second backflush pipes 522 are all connected to the dispersion cylinder 52. The two first backflush pipes 521 are matched with the two first detection gas pipes 641, and the five second backflush pipes 522 are matched with the five second detection gas pipes 642.

[0028] Specifically, the gas channels are thoroughly cleaned using a multi-channel backflushing tube to prevent sample contamination.

[0029] In this embodiment, the carbon fiber cavity is assembled as follows: the inlet pipe 11 is fixed to one end of the carbon fiber cavity 1 by welding, the sealing cap 12 is connected to the other end of the carbon fiber cavity 1 by bolts, and a sealing ring 51 is installed at the connection to ensure sealing; the detection outlet 13 is welded to the top of the sealing cap 12, and the gas release valve 131 is installed to the detection outlet 13 by thread; the backflushing discharge pipe 14 is welded to the bottom of the inlet pipe 11, and the backflushing discharge valve 141 is installed to the backflushing discharge pipe 14 by thread; Intelligent control unit assembly: Three piezoelectric ceramic actuators 21 are evenly distributed and fixed to the inner wall of the carbon fiber cavity 1 near the inlet pipe 11 at a preset position with bolts. The coaxiality error of the output shafts of the three actuators is ≤0.1mm. The sealing ring 22 is fixed to the end of the output shaft of the three piezoelectric ceramic actuators 21 with bolts, ensuring that the sealing ring 22 fits in close contact with the inner wall of the carbon fiber cavity 1. The deformable polytetrafluoroethylene film 23 is fixed to the sealing ring 22 by adhesive bonding, and there are no air bubbles on the bonding surface. Miniature multi-pass cell unit assembly: The reflector group 612 is installed at both ends inside the reflector tube 61, and the reflection angle is adjusted to ensure that the laser path is extended to 4.2 meters; the series FBG fiber Bragg grating assembly 62 is tilted and fixed to the top of the reflector tube 61 by the bracket at an angle of 30° to ensure that the laser can be reflected by the reflector group; the reflector tube 61 is fixed to the middle position inside the carbon fiber cavity 1 by the bracket, one end of the conical guide tube 7 is connected to one end of the reflector tube 61 by a flange, and the other end faces the deformable polytetrafluoroethylene film 23; one end of the round tube 63 is welded to the round hole 611 of the reflector tube 61, and the other end is welded to the multi-pass cell outlet end 64; two first detection gas tubes 641 and five second detection gas tubes 642 are respectively welded to the multi-pass cell outlet end 64, separated by an arc-shaped partition plate 66, and a sealing plate 65 is welded to the inner wall of the carbon fiber cavity 1 and wrapped around the outside of the first detection gas tubes 641 and the second detection gas tubes 642; Sensor detection unit assembly: The controller 31 is fixed to the top of the carbon fiber cavity 1 with bolts; two TDLAS sensors 33 are fixed inside the carbon fiber cavity 1 with brackets, and their detection ends are aligned with the first detection air tube 641; five QEPAS sensors 32 are fixed inside the carbon fiber cavity 1 with brackets, and their detection ends are aligned with the second detection air tube 642; the intelligent control unit 34 is fixed to the top of the controller 31 with bolts, and the controller 31 is connected to the piezoelectric ceramic actuator 21, the TDLAS sensors 33, and the QEPAS sensors 32 with wires; Inert gas cleaning unit assembly: The backflush pump 53 is fixed to the outside of the sealing cover 12 with bolts. One end of the connecting pipe 54 is welded to the outlet of the backflush pump 53, and the other end is welded to the dispersion cylinder 52. Two first backflush pipes 521 and five second backflush pipes 522 are welded to the dispersion cylinder 52 respectively. The other end of the first backflush pipe 521 is inserted into the first detection gas pipe 641, and the other end of the second backflush pipe 522 is inserted into the second detection gas pipe 642. Aseptic sampling port unit assembly: Place the filter ring 42 into the notch on the inner wall of the inlet pipe 11, and embed the sterile filter membrane 421 into the filter ring 42; connect the conical air inlet 41 to the inlet pipe 11 through the internal thread 412, and the limiting block 413 ensures that the connection is in place.

[0030] Working principle: Before starting the equipment, check the connection status of each component: confirm that the sealing cover 12 is well sealed, and that the backflushing discharge valve 141 and the gas release valve 131 are in the closed state; replace the sterile filter membrane 421 of the sterile sampling port unit 4, install the filter ring 42 into the notch of the inlet pipe 11, and tighten the conical air inlet 41; initialize the equipment parameters through the touch interface of the intelligent control unit 34, and set parameters such as CO2 concentration benchmark value of 4%, dynamic calibration threshold, FBG optical deviation > 0.1% or detection sample concentration > 50ppm, and cleaning time of 30s; start the equipment to preheat for 5 minutes to ensure stable operation of components such as sensors and piezoelectric ceramic actuators.

[0031] The subject exhales through the conical air inlet 41, and the gas enters the sterile sampling port unit 4 through the connecting air hole 411. The gas passes through the sterile filter membrane 421 to filter out dust, bacteria and other impurities in the air, avoiding contamination of the subsequent detection channel. The filtered gas enters the carbon fiber cavity 1 through the inlet tube 11. At this time, the sensor detection unit 3 is activated, and the controller 31 controls the TDLAS sensor 33 to detect the CO2 concentration in the cavity in real time, generate a concentration reference value and transmit it to the MCU main control module of the intelligent control unit 34.

[0032] The MCU main control module outputs a corresponding voltage signal to drive the piezoelectric ceramic actuator 21 of the intelligent control unit 2 to operate based on the received CO2 concentration reference value, thereby realizing the adaptive adjustment of the chamber volume. For low-concentration sample adjustment, CO2 concentration <4%: the MCU outputs a 10-12V voltage, and the three piezoelectric ceramic actuators 21 contract synchronously, driving the sealing ring 22 and the deformable polytetrafluoroethylene membrane 23 to move towards the right end of the carbon fiber cavity 1 until the deformable polytetrafluoroethylene membrane 23 is 5-10mm away from the right end face of the cavity. At this time, the cavity volume drops to 0.2-1mL, achieving a 25-5 times concentration of low-concentration gas and improving the sensitivity of subsequent detection. High-concentration sample adjustment, CO2 concentration ≥4%: MCU outputs 5-8V voltage, three piezoelectric ceramic actuators 21 expand synchronously, driving the sealing ring 22 and deformable polytetrafluoroethylene membrane 23 to move to the left end of the carbon fiber cavity 1 until it is 40-45mm away from the left end face of the cavity. At this time, the cavity volume is maintained at 1-5mL to avoid sensor saturation caused by high concentration of gas and to ensure detection accuracy.

[0033] Under the influence of pressure difference, the concentrated gas is guided by the conical guide tube 7 and precisely introduced into the reflector tube 61 of the micro multi-pass cell unit 6 through the guide tube 71. The intelligent control unit 34 controls the series FBG fiber Bragg grating assembly 62 to emit characteristic wavelength laser. After the laser enters the reflector tube 61, it is reflected multiple times by the reflector group 612, extending the optical path to 4.2 meters. The gas fully absorbs the laser energy, realizing the full interaction between the gas components and the laser. The gas that has absorbed the laser energy enters the circular tube 63 through the circular hole 611, and then flows into the multi-pass cell outlet 64. It is then diverted to seven inlet channels through two first detection gas tubes 641 and five second detection gas tubes 642, and delivered to the corresponding TDLAS sensor 33 and QEPAS sensor 32 respectively.

[0034] Two TDLAS sensors 33 detect the absorption spectrum signals of CO2 and methane, and five QEPAS sensors 32 detect the photoacoustic signals of VOCs. All sensor detection signals are synchronously transmitted to the AI ​​inference module of the intelligent control unit 34. At the same time, the QEPAS sensor 32 of the FBG verification unit receives the optical signal after being reacted with the gas and generates reference data. The NPU chip of the AI ​​inference module runs a transfer learning AI model, integrates the sensor detection signals, FBG optical reference signals and environmental signals collected by temperature and humidity sensors, decouples cross-sensitive interference through algorithms, accurately analyzes the concentration values ​​of each component of the gas, and stores the analysis results in the data storage module, while displaying them in real time on the touch interface.

[0035] The AI ​​inference module compares and analyzes the results with preset thresholds in real time: if the FBG optical deviation is >0.1% or the concentration of the detected sample is >50ppm, the dynamic calibration mechanism is triggered; the intelligent control unit 34 controls the standard gas generation module to start, and at the same time opens the gas release valve 131. The standard gas enters the carbon fiber cavity 1 through the detection outlet 13, and the detection process of steps 4-5 is repeated; the AI ​​inference module compares the standard gas detection results with the standard value, generates a calibration coefficient, corrects the sensor detection signal, and after the correction is completed, closes the gas release valve 131 and the standard gas generation module, and stores the calibration data in the data storage module.

[0036] After the test is completed, the intelligent control unit 34 controls the inert gas cleaning unit 5 to start: the backflush discharge valve 141 is opened, the backflush pump 53 works, and the nitrogen in the nitrogen storage tank enters the dispersion cylinder 52 through the connecting pipe 54. The first detection gas pipe 641 and the second detection gas pipe 642 are backflushed through the two first backflush pipes 521 and the five second backflush pipes 522 respectively. The backflush gas carries the residual sample in the channel, passes through the round pipe 63, the reflector 61, the conical guide tube 7, the carbon fiber cavity 1, and the inlet pipe 11, and is finally discharged from the backflush discharge pipe 14. After the cleaning lasts for 30 seconds, the backflush pump 53 and the backflush discharge valve 141 are turned off.

[0037] The intelligent control unit 34 outputs a control signal to drive the piezoelectric ceramic actuator 21 to reset, and the deformable polytetrafluoroethylene membrane 23 returns to its initial position 20mm away from the left end face of the cavity; the device completes one detection cycle and can perform the next sampling detection; if no further detection is needed, turn off the device power, remove the conical air inlet 41 and filter ring 42, and clean and store the sampling port.

[0038] Example 2 Example 2 is the same as Example 1 in the rest, except that: a displacement sensor is integrated into the piezoelectric ceramic actuator 21. The displacement sensor is electrically connected to the intelligent control unit 34 and is used to collect the displacement data of the actuator in real time and realize closed-loop control.

[0039] Pressure protection: A pressure sensor is installed inside the carbon fiber cavity 1. If the pressure inside the cavity is >0.1MPa, the intelligent control unit 34 will immediately open the backflow discharge valve 141 to release the pressure and trigger an audible and visual alarm.

[0040] All structural shapes, sizes, and materials included in Embodiment 1 in this application can be selected and adjusted to meet specific usage needs. The accompanying drawings are schematic structural diagrams, and the actual dimensions can be appropriately adjusted.

[0041] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A gas collection device with gas detection function, comprising a carbon fiber cavity (1), one end of which is connected to an inlet pipe (11), characterized in that, The inlet tube (11) is connected to a sterile sampling port unit (4), and the other end of the carbon fiber cavity (1) is connected to a sealing cap (12). The intelligent control unit (2) is located inside the carbon fiber cavity (1), near the inlet pipe (11); A micro multi-channel pool unit (6) is set inside the carbon fiber cavity (1). One end of the micro multi-channel pool unit (6) is connected to a conical guide tube (7). The conical guide tube (7) is located inside the carbon fiber cavity (1) and close to the intelligent control unit (2). The sensor detection unit (3) is set on the carbon fiber cavity (1) and used in conjunction with the micro multi-pass cell unit (6) for detecting gas; An inert gas cleaning unit (5) is installed on the sealing cover (12) for backflushing the micro multi-channel pool unit (6).

2. A gas collection device with gas detection function according to claim 1, characterized in that, The intelligent control unit (2) includes three piezoelectric ceramic actuators (21). All three piezoelectric ceramic actuators (21) are installed on the inner wall of the carbon fiber cavity (1). The same sealing ring (22) is installed on the output shaft of the three piezoelectric ceramic actuators (21). The sealing ring (22) is slidably connected to the inner wall of the carbon fiber cavity (1). A deformable polytetrafluoroethylene membrane (23) is provided on the sealing ring (22).

3. A gas collection device with gas detection function according to claim 1, characterized in that, The sensor detection unit (3) includes a controller (31), which is installed on the top of the carbon fiber cavity (1). The controller (31) is connected to two TDLAS sensors (33) and five QEPAS sensors (32). The two TDLAS sensors (33) and five QEPAS sensors (32) are all located inside the carbon fiber cavity (1). The controller (31) is connected to an intelligent control unit (34). The intelligent control unit (34) includes an MCU main control module, an AI inference module, a standard gas generation module and a data storage module, and is equipped with a transfer learning AI model and a dynamic calibration mechanism.

4. A gas collection device with gas detection function according to claim 1, characterized in that, The sterile sampling port unit (4) includes a conical air inlet (41), an internal thread (412) is provided on the inner side of the conical air inlet (41), three limiting blocks (413) are fixedly installed on the inner wall of the internal thread (412), a connecting air hole (411) is provided on the conical air inlet (41), a filter ring (42) is provided between the conical air inlet (41) and the inlet pipe (11), and a sterile filter membrane (421) is provided on the filter ring (42).

5. A gas collection device with gas detection function according to claim 4, characterized in that, The inner wall of the inlet pipe (11) has a notch, and the filter ring (42) is placed in the notch.

6. A gas collection device with gas detection function according to claim 1, characterized in that, The micro multi-pass cell unit (6) includes a reflector cylinder (61), and a guide pipe (71) is connected between the reflector cylinder (61) and the conical guide cylinder (7). A series FBG fiber Bragg grating assembly (62) is inclinedly arranged on the top of the reflector cylinder (61). A reflector group (612) is arranged inside the reflector cylinder (61), which is used to reflect the light of the series FBG fiber Bragg grating assembly (62).

7. A gas collection device with gas detection function according to claim 6, characterized in that, The reflector tube (61) has a circular hole (611) and a circular tube (63) is connected to the circular hole (611). The circular tube (63) is connected to a multi-channel cell exit end (64). The multi-channel cell exit end (64) is connected to two first detection air tubes (641) and five second detection air tubes (642). A sealing plate (65) is provided inside the carbon fiber cavity (1). The sealing plate (65) is fixedly installed on the outside of the first detection air tubes (641) and the second detection air tubes (642). Two TDLAS sensors (33) cooperate with the two first detection air tubes (641), and the five second detection air tubes (642) cooperate with the five QEPAS sensors (32).

8. A gas collection device with gas detection function according to claim 1, characterized in that, An arc-shaped partition plate (66) is fixedly installed inside the carbon fiber cavity (1), which separates the first detection air tube (641) from the second detection air tube (642).

9. A gas collection device with gas detection function according to claim 1, characterized in that, The inert gas cleaning unit (5) includes a backflush pump (53), which is installed on the outside of the sealing cover (12). A connecting pipe (54) is connected to the backflush pump (53), and a dispersing cylinder (52) is connected to the connecting pipe (54). Two first backflush pipes (521) and five second backflush pipes (522) are connected to the dispersing cylinder (52). The two first backflush pipes (521) are matched with two first detection gas pipes (641), and the five second backflush pipes (522) are matched with five second detection gas pipes (642).

10. A gas collection device with gas detection function according to claim 1, characterized in that, The sealing cap (12) is connected to a detection outlet (13), and a gas release valve (131) is provided on the detection outlet (13). The bottom of the inlet pipe (11) is connected to a backflushing discharge pipe (14), and a backflushing discharge valve (141) is provided on the backflushing discharge pipe (14).

Images