Electronic nose device with air curtain

Abstract

The utility model discloses an electronic nose device with an air curtain. The electronic nose device comprises an air curtain device and a detector. The air curtain device is composed of a device body, an active air outlet channel, a passive air outlet channel, an active air inlet channel and a passive air inlet channel. The active air outlet channel is annularly formed in the device body. The passive air outlet channel is annularly arranged on the inner side of the active air outlet channel. The active air inlet channel is annularly arranged on the inner side of the passive air outlet channel. The passive air inlet channel is arranged on the inner side of the active air inlet channel. When the first airflow is injected into the active air outlet channel, the second airflow is induced to be generated, and the first airflow and the second airflow are combined to form a hollow air curtain which is ejected towards the collecting end. Meanwhile, the third airflow is injected into the active air inlet channel to induce generation of fourth airflow, and the fourth airflow comes from the target gas surrounded by the hollow air curtain. According to the device, the space occupation is reduced while the to-be-detected gas is effectively collected, and the device adapts to specific environment requirements.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of electronic nose device technology, and more specifically, this utility model relates to an electronic nose device with an air curtain. Background Technology

[0002] With the continuous development of gas detection technology, traditional chemical analysis methods are no longer sufficient to meet the demands of modern industry for rapid, real-time detection. Against this backdrop, electronic nose technology, simulating the biological olfactory system, has emerged. Electronic nose devices, by mimicking the working principle of biological olfactory organs, utilize multi-sensor arrays to achieve rapid identification and detection of complex gas components, demonstrating significant application value in fields such as food safety, medical diagnosis, environmental monitoring, and industrial process control. Electronic nose devices typically consist of an air curtain and a detector. The detector employs a sensitive material with specific selectivity to detect the target gas. When the target gas comes into contact with the sensor surface, gas molecules interact with the sensitive material through free diffusion. This interaction may manifest as physical adsorption or a chemical reaction. This process causes changes in the electrical properties of the sensor, including but not limited to changes in parameters such as conductivity, capacitance, or impedance. By detecting these changes in electrical parameters, qualitative and quantitative analysis of the target gas components can be achieved.

[0003] Existing air curtain devices typically use a built-in fan to create an air curtain to drive the flow of the gas to be detected, thereby achieving the gas collection function. However, in certain special application scenarios, electronic nose devices need to minimize their space occupation to meet specific environmental requirements (such as installation inside a robotic vacuum cleaner). Reducing space occupation inevitably leads to a reduction in fan size, which in turn directly reduces suction power, resulting in ineffective gas collection. This contradiction restricts the application of electronic nose devices in special environments. Utility Model Content

[0004] To address one or more of the technical problems mentioned above, this utility model provides an electronic nose device with an air curtain. By eliminating the built-in fan in the electronic nose and instead using a direct air supply method that introduces high-pressure airflow at both the active air outlet and active air inlet of the air curtain, the device can reduce its space occupancy while effectively collecting the gas to be detected, thereby meeting specific environmental requirements.

[0005] This utility model provides an electronic nose device with an air curtain, including an air curtain device having a detection end and a collection end, and a detector connected to the detection end of the air curtain device for qualitative and quantitative detection of the components to be detected in the target gas.

[0006] The air curtain includes:

[0007] Device body;

[0008] An active air outlet channel is formed in a ring shape within the main body of the device, and has an inlet and an outlet respectively located at the detection end and the acquisition end of the main body of the device;

[0009] A passive air outlet channel is arranged in a ring shape inside the active air outlet channel, and has an inlet and an outlet respectively located at the detection end and the acquisition end of the device body;

[0010] An active air intake channel, which is arranged in a ring shape inside the passive air outlet channel, has an inlet and an outlet respectively located at the acquisition end and the detection end of the device body; and

[0011] A passive air intake channel is disposed inside the active air intake channel and has an inlet and an outlet both located within the passive air intake channel;

[0012] When a first airflow is injected into the active air outlet channel, the first airflow enters from the inlet of the active air outlet channel and exits from its outlet, and induces a second airflow to be generated in the passive air outlet channel. The first airflow and the second airflow merge after leaving the device body and are ejected toward the collection end of the device body to form a hollow air curtain at the collection end of the device body.

[0013] When a third airflow is injected into the active air intake channel, the third airflow enters from the inlet of the active air intake channel and exits from its outlet, and induces a fourth airflow to be generated in the passive air intake channel, wherein the fourth airflow comes from the target gas surrounded by the hollow air curtain and located in front of the collection end of the device body.

[0014] Furthermore, the device body includes:

[0015] The first housing, wherein the active air outlet channel, the passive air outlet channel, the active air inlet channel and the passive air inlet channel are sequentially disposed in the first housing;

[0016] The first cylindrical wall is located between the active air outlet channel and the passive air outlet channel;

[0017] The second cylindrical wall is located between the passive air outlet channel and the active air inlet channel;

[0018] The third cylindrical wall is located between the active air intake channel and the passive air intake channel;

[0019] A first connecting structure is used to sequentially connect the first cylindrical wall, the second cylindrical wall, and the third cylindrical wall to the first housing.

[0020] Furthermore, the distance between the end of the first cylinder wall near the detector and the first housing is greater than the distance between the end of the first cylinder wall away from the detector and the first housing; the distance between the end of the first cylinder wall near the detector and the end of the second cylinder wall near the detector is greater than the distance between the end of the first cylinder wall away from the detector and the end of the second cylinder wall away from the detector; and the area of ​​the outlet of the active air outlet channel is smaller than the area of ​​the outlet of the passive air outlet channel.

[0021] Furthermore, the end of the second cylindrical wall away from the detector is located outside the first housing, and the end of the first cylindrical wall away from the detector is located inside the first housing.

[0022] Furthermore, the dimension of the third cylindrical wall in the axial direction of the first housing is shorter than the dimension of the second cylindrical wall in the axial direction of the first housing, and in the radial direction of the first housing, the distance from the end of the third cylindrical wall near the detector to the second cylindrical wall is less than the distance from the end of the third cylindrical wall away from the detector to the second cylindrical wall.

[0023] Furthermore, the ends of the first cylindrical wall and the second cylindrical wall near the detector are flush with the end of the first housing near the detector, and the end of the third cylindrical wall near the detector is further away from the detector than the end of the second cylindrical wall near the detector, while the end of the third cylindrical wall away from the detector is closer to the detector than the end of the first cylindrical wall away from the detector.

[0024] Furthermore, the detector includes:

[0025] The second housing has a space inside that communicates with the active air intake channel and the passive air intake channel;

[0026] A partition cylinder is fixed inside the second housing by a second connecting structure, and at least partially divides the space inside the second housing into a detection channel and a sewage discharge channel surrounding the detection channel;

[0027] A gas sensor is fixedly installed in the partition cylinder and located within the detection channel.

[0028] Furthermore, the detector also includes a partition disposed within the partition cylinder and used to form the detection channel into a meandering channel.

[0029] Furthermore, the detector also includes a breathable and dirt-blocking membrane fixed inside the second housing. The breathable and dirt-blocking membrane is configured to completely cover the end of the detection channel facing the air curtain, and only open the bottom area of ​​the end of the sewage channel facing the air curtain.

[0030] Furthermore, the detector also includes a first hook disposed on the second housing, and the air curtain also includes a second hook disposed on the main body of the device and capable of engaging with the first hook.

[0031] This embodiment provides an electronic nose device with an air curtain. A first airflow is injected into the active air outlet channel, entering through the inlet and exiting through the outlet, while simultaneously inducing a second airflow in the passive air outlet channel. The first and second airflows merge after separating from the device body, forming a hollow air curtain projecting towards the device body's collection end. This hollow air curtain encapsulates the target gas, effectively isolating it from external gas interference and preventing adverse effects such as turbulence. Simultaneously, a third airflow is injected into the active air inlet channel, entering through the inlet and exiting through the outlet, inducing a fourth airflow in the passive air inlet channel. The third and fourth airflows work synergistically to transport the target gas encapsulated by the hollow air curtain into the air curtain unit, completing the collection of the target gas. Compared to existing technologies, firstly, the hollow air curtain of this electronic nose device effectively ensures the quality of target gas collection and avoids interference from external gases. Secondly, by optimizing the airflow path design, the synergistic effect of the first airflow driving the second airflow and the third airflow driving the fourth airflow is achieved, improving gas collection efficiency. Finally, by using airflow injection instead of the existing traditional built-in fan, the size of this electronic nose device is significantly reduced, and space utilization is improved. Attached Figure Description

[0032] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0033] Figure 1 A cross-sectional view of an electronic nose device with an air curtain provided in an embodiment of the present invention is shown.

[0034] Figure 2 A side view of an electronic nose device with an air curtain provided in an embodiment of the present invention is shown;

[0035] Figure 3 A schematic diagram of the structure of an electronic nose device with an air curtain provided in an embodiment of the present invention is shown.

[0036] Figure 4 This diagram illustrates the structure of an electronic nose device with an air curtain, provided by an embodiment of the present invention, applied to a robotic vacuum cleaner.

[0037] In the picture:

[0038] 1. Air curtain; 11. Detection end; 12. Data acquisition end; 13. Device body; 131. First housing; 132. First cylinder wall; 133. Second cylinder wall; 134. Third cylinder wall; 135. First connecting structure; 14. Active air outlet channel; 15. Passive air outlet channel; 16. Active air inlet channel; 17. Passive air inlet channel; 18. Second hook; 19. First support frame; 191. First connecting hole; 10. Second support frame; 101. Second connecting hole;

[0039] 2. Detector; 21. Second housing; 22. Partition cylinder; 23. Detection channel; 24. Sewage discharge channel; 25. Second connecting structure; 26. Gas sensor; 27. Partition; 28. Breathable and dirt-blocking membrane; 29. ​​First hook;

[0040] 100. Air pump; 200. Controller. Detailed Implementation

[0041] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0042] Figure 1 A cross-sectional view of an electronic nose device with an air curtain provided in this embodiment is shown. Figure 2 A side view of an electronic nose device with an air curtain provided in this embodiment is shown. Figure 1 and Figure 2As shown, this embodiment provides an electronic nose device with an air curtain. The electronic nose device includes an air curtain 1 with a detection end 11 and a collection end 12, and a detector 2 connected to the detection end 11 of the air curtain 1 for qualitative and quantitative detection of the components to be detected in the target gas. The air curtain 1 includes a device body 13, an active air outlet channel 14, a passive air outlet channel 15, a passive air inlet channel 17, and an active air inlet channel 16. The active air outlet channel 14 is formed annularly within the device body 13 and has an inlet and an outlet respectively located at the detection end 11 and the collection end 12 of the device body 13. The passive air outlet channel 15 is annularly disposed inside the active air outlet channel 14 and has an inlet and an outlet respectively located at the detection end 11 and the collection end 12 of the device body 13. The active air inlet channel 16 is annularly disposed inside the passive air outlet channel 15 and has an inlet and an outlet respectively located at the collection end 12 and the detection end 11 of the device body 13. The passive air intake channel 17 is located inside the active air intake channel 16 and has an inlet and an outlet both located within it. When a first airflow is injected into the active air outlet channel 14, the first airflow enters through its inlet and exits through its outlet, inducing a second airflow to be generated within the passive air outlet channel 15. The first and second airflows merge after detaching from the device body 13 and are ejected towards the collection end 12 of the device body 13, forming a hollow air curtain at the collection end 12. When a third airflow is injected into the active air intake channel 16, the third airflow enters through its inlet and exits through its outlet, inducing a fourth airflow to be generated within the passive air intake channel 17. This fourth airflow originates from the target gas surrounded by the hollow air curtain and located in front of the collection end 12 of the device body 13.

[0043] This embodiment provides an electronic nose device with an air curtain. A first airflow is injected into the active air outlet channel 14, entering from the inlet and exiting from the outlet, while simultaneously inducing a second airflow in the passive air outlet channel 15. The first and second airflows merge after separating from the device body 13, forming a hollow air curtain projecting towards the collection end 12 of the device body 13. This hollow air curtain encapsulates the target gas, effectively isolating it from external gas interference and preventing adverse effects such as turbulence. Simultaneously, a third airflow is injected into the active air inlet channel 16, entering from the inlet and exiting from the outlet, and inducing a fourth airflow in the passive air inlet channel 17. The third and fourth airflows work synergistically to transport the target gas encapsulated by the hollow air curtain into the air curtain unit 1, completing the collection of the target gas. Compared with existing technologies, firstly, the hollow air curtain of this electronic nose device effectively ensures the quality of target gas collection and avoids interference from external gases. Secondly, by optimizing the airflow path design, the synergistic effect of the first airflow driving the second airflow and the third airflow driving the fourth airflow is achieved, improving the gas collection efficiency. Finally, by using airflow injection instead of the existing traditional built-in fan, the size of this electronic nose device is significantly reduced, and space utilization is improved.

[0044] Furthermore, the device body 13 includes a first housing 131, a first cylindrical wall 132, a second cylindrical wall 133, a third cylindrical wall 134, and a first connecting structure 135. An active air outlet channel 14, a passive air outlet channel 15, an active air inlet channel 16, and a passive air inlet channel 17 are sequentially disposed within the first housing 131. The first cylindrical wall 132 is disposed between the active air outlet channel 14 and the passive air outlet channel 15 to separate the active air outlet channel 14 and the passive air outlet channel 15 within the device body 13, thereby forming the active air outlet channel 14 and the passive air outlet channel 15. The second cylindrical wall 133 is disposed between the passive air outlet channel 15 and the active air inlet channel 16 to separate the passive air outlet channel 15 and the active air inlet channel 16 within the device body 13, thereby forming the passive air outlet channel 15 and the active air inlet channel 16. The third cylindrical wall 134 is disposed between the active air intake channel 16 and the passive air intake channel 17 to separate the active air intake channel 16 and the passive air intake channel 17 within the device body 13, thereby forming the active air intake channel 16 and the passive air intake channel 17. The first connecting structure 135 is used to connect the first cylindrical wall 132, the second cylindrical wall 133, and the third cylindrical wall 134 sequentially to the first housing 131 to support the first cylindrical wall 132, the second cylindrical wall 133, and the third cylindrical wall 134, thereby preventing the first cylindrical wall 132, the second cylindrical wall 133, and the third cylindrical wall 134 from collapsing or causing other problems that affect the collection efficiency of the target gas during the collection process.

[0045] It should be noted that the air curtain 1 of the electronic nose device provided in this embodiment can inject airflow through components such as an air pump.

[0046] Specifically, the device body 13 also includes a first support frame 19 disposed between the first housing 131 and the first cylindrical wall 132 and having a first connection hole 191, for connecting an air pump and injecting a first airflow into the active air outlet channel 14 through the first connection hole 191. The device body 13 also includes a second support frame 10 disposed between the second cylindrical wall 133 and the third cylindrical wall 134 and having a second connection hole 101, for connecting an air pump and injecting a first airflow into the active air inlet channel 16 through the second connection hole 101.

[0047] Furthermore, the distance between the end of the first cylinder wall 132 near the detector 2 and the first housing 131 is greater than the distance between the end of the first cylinder wall 132 away from the detector 2 and the first housing 131, so that the cross-sectional area of ​​the active air outlet channel 14 gradually decreases in the direction away from the detector 2, thereby forming a tapered flow channel structure, which enables the first airflow to generate an acceleration effect when flowing through the active air outlet channel 14. The distance between the end of the first cylinder wall 132 near the detector 2 and the end of the second cylinder wall 133 near the detector 2 is greater than the distance between the end of the first cylinder wall 132 away from the detector 2 and the end of the second cylinder wall 133 away from the detector 2, so that the cross-sectional area of ​​the passive air outlet channel 15 gradually decreases in the direction away from the detector 2, thereby forming a tapered flow channel structure, which enables the second airflow to generate an acceleration effect when flowing through the passive air outlet channel 15. Furthermore, the area of ​​the outlet of the active air outlet channel 14 is smaller than the area of ​​the outlet of the passive air outlet channel 15, so that the first airflow ejected from the outlet of the active air outlet channel 14 forms a negative pressure zone, thereby generating an ejection effect that drives the second airflow ejected from the outlet of the passive air outlet channel 15 to accelerate synchronously, thereby forming a hollow air curtain at the collection end 12 of the device body 13, so as to effectively isolate the interference of external gas and maintain the stability inside the hollow air curtain.

[0048] Furthermore, the end of the second cylinder wall 133 away from the detector 2 is located outside the first housing 131, and the end of the first cylinder wall 132 away from the detector 2 is located inside the first housing 131, so as to block the second airflow ejected through the outlet of the passive air outlet channel 15, thereby enabling the first airflow to drive more second airflow to accelerate synchronously.

[0049] Furthermore, in the radial direction of the first housing 131, the distance from the end of the third cylinder wall 134 near the detector 2 to the second cylinder wall 133 is less than the distance from the end of the third cylinder wall 134 away from the detector 2 to the second cylinder wall 133. This causes the cross-sectional area of ​​the active air intake channel 16 to gradually increase in the direction away from the detector 2, thereby forming a gradually expanding flow channel structure with the passive air intake channel 17. This allows the third airflow to generate an acceleration effect when flowing through the active air intake channel 16. The axial dimension of the third cylinder wall 134 in the first housing 131 is shorter than the axial dimension of the second cylinder wall 133 in the first housing 131. This shortens the airflow path of the fourth airflow in the passive air intake channel 17, allowing the third airflow in the active air intake channel 16 to generate an entrainment effect with the fourth airflow in the passive air intake channel 17 as early as possible.

[0050] Furthermore, the ends of the first cylinder wall 132 and the second cylinder wall 133 near the detector 2 are flush with the end of the first housing 131 near the detector 2 to ensure the stability of the first airflow in the active air outlet channel 14 and the second airflow in the passive air outlet channel 15. The end of the third cylinder wall 134 near the detector 2 is further away from the detector 2 than the end of the second cylinder wall 133 near the detector 2, and the end of the third cylinder wall 134 away from the detector 2 is closer to the detector 2 than the end of the first cylinder wall 132 away from the detector 2, so that the third airflow can generate an ejection effect with the fourth airflow in the passive air outlet channel 17 as early as possible, whether it is from the inlet or outlet of the active air inlet channel 16.

[0051] Figure 3 A schematic diagram of the structure of an electronic nose device with an air curtain provided in this embodiment is shown. Figure 3 and combined Figure 1 and Figure 2 As shown, detector 2 includes a second housing 21, a partition cylinder 22, and a gas sensor 26. The second housing 21 has a space communicating with the active air intake channel 16 and the passive air intake channel 17, allowing the target gas collected by the air curtain 1 to smoothly enter detector 2. The partition cylinder 22 is fixed inside the second housing 21 by a second connecting structure 25, at least partially dividing the space inside the second housing 21 into a detection channel 23 and a drainage channel 24 surrounding the detection channel 23. This effectively separates the detection channel 23 from the drainage channel 24, reducing interference from pollutants on the target gas and improving the accuracy and reliability of the detection. The gas sensor 26 is fixed in the partition cylinder 22 and located within the detection channel 23 to perform qualitative and quantitative detection of the target gas components.

[0052] It should be noted that the target gas is a selected portion of the air, and the component to be detected can be any gas mixed in with the air.

[0053] Furthermore, the detector 2 also includes a baffle 27 disposed within the partition cylinder 22 to form the detection channel 23 into a meandering channel, providing a longer flow distance for the target gas. The meandering channel also allows for the placement of more gas sensors 26, thereby improving the accuracy of the electronic nose device in detecting the components to be detected within the target gas. For example, the baffle 27 can be a cylindrical helical blade to facilitate the meandering formation of the detection channel 23, and the circular helical blade is easier to install. It is worth mentioning that the cylindrical helical blade, by utilizing its shape, can also eliminate some of the noise within the detection channel 23.

[0054] Furthermore, the detector 2 also includes a breathable and dirt-blocking membrane 28 fixed within the second housing 21. The membrane 28 is configured to completely block the end of the detection channel 23 facing the air curtain 1, leaving only the bottom area of ​​the exhaust channel 24 facing the air curtain 1 open. The membrane 28 allows the target gas to pass through and filter out some impurities, preventing impurities (such as dust or particulate matter) from interfering with the normal operation of the gas sensor 26 and causing errors in the detection results. This ensures that the gas sensor 26 operates in a cleaner environment. The impurities (such as dust or particulate matter) blocked by the membrane 28 can be discharged through the active exhaust channel 14 and the passive exhaust channel 15, preventing the accumulation of impurities within the isolation cylinder 22.

[0055] Preferably, the detector 2 further includes a first hook 29 disposed on the second housing 21, and the air curtain 1 further includes a second hook 18 disposed on the device body 13 and capable of engaging with the first hook 29, so as to enable quick installation and disassembly based on the detachable connection between the detector 2 and the air curtain 1.

[0056] Figure 4 This diagram illustrates the structure of an electronic nose device with an air curtain, as provided in this embodiment, applied to a robotic vacuum cleaner. Figure 4 and combined Figure 1 and Figure 2 As shown, the electronic nose device provided in this embodiment can adapt to the specific environmental requirements of a robotic vacuum cleaner, such as arranging the air curtain 1 inside the robotic vacuum cleaner and placing it above and to the side of the detector 2. The air pump 100 and controller 200 of the robotic vacuum cleaner are also arranged inside the robotic vacuum cleaner, wherein the air pump 100 is connected to this electronic nose device, and the controller 200 is connected to the air pump 100 to control the opening and closing of the air pump.

[0057] In the foregoing description of this application, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this application, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] Based on the above description of this application, those skilled in the art will also understand that terms used, such as "upper," "front," "bottom," "inner," "outer," "axial," and "radial," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this application. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present invention.

[0059] Furthermore, the terms "first" or "second," etc., used in this application to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as explicitly or implicitly indicating relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0060] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An electronic nose device with an air curtain, characterized in that, It includes an air curtain with a detection end and a collection end, and a detector connected to the detection end of the air curtain for qualitative and quantitative detection of the components to be detected in the target gas. The air curtain includes: Device body; An active air outlet channel is formed in a ring shape within the main body of the device, and has an inlet and an outlet respectively located at the detection end and the acquisition end of the main body of the device; A passive air outlet channel is arranged in a ring shape inside the active air outlet channel, and has an inlet and an outlet respectively located at the detection end and the acquisition end of the device body; An active air intake channel, which is arranged in a ring shape inside the passive air outlet channel, has an inlet and an outlet respectively located at the acquisition end and the detection end of the device body; and A passive air intake channel is disposed inside the active air intake channel and has an inlet and an outlet both located within the passive air intake channel; When a first airflow is injected into the active air outlet channel, the first airflow enters from the inlet of the active air outlet channel and exits from its outlet, and induces a second airflow to be generated in the passive air outlet channel. The first airflow and the second airflow merge after leaving the device body and are ejected toward the collection end of the device body to form a hollow air curtain at the collection end of the device body. When a third airflow is injected into the active air intake channel, the third airflow enters from the inlet of the active air intake channel and exits from its outlet, and induces a fourth airflow to be generated in the passive air intake channel, wherein the fourth airflow comes from the target gas surrounded by the hollow air curtain and located in front of the collection end of the device body.

2. The electronic nose device according to claim 1, characterized in that, The main body of the device includes: The first housing, wherein the active air outlet channel, the passive air outlet channel, the active air inlet channel and the passive air inlet channel are sequentially disposed in the first housing; The first cylindrical wall is located between the active air outlet channel and the passive air outlet channel; The second cylindrical wall is located between the passive air outlet channel and the active air inlet channel; The third cylindrical wall is located between the active air intake channel and the passive air intake channel; A first connecting structure is used to sequentially connect the first cylindrical wall, the second cylindrical wall, and the third cylindrical wall to the first housing.

3. The electronic nose device according to claim 2, characterized in that, The distance between the end of the first cylinder wall near the detector and the first housing is greater than the distance between the end of the first cylinder wall away from the detector and the first housing; the distance between the end of the first cylinder wall near the detector and the end of the second cylinder wall near the detector is greater than the distance between the end of the first cylinder wall away from the detector and the end of the second cylinder wall away from the detector; and the area of ​​the outlet of the active air outlet channel is smaller than the area of ​​the outlet of the passive air outlet channel.

4. The electronic nose device according to claim 3, characterized in that, The end of the second cylindrical wall away from the detector is located outside the first housing, and the end of the first cylindrical wall away from the detector is located inside the first housing.

5. The electronic nose device according to claim 4, characterized in that, The dimension of the third cylindrical wall in the axial direction of the first housing is shorter than the dimension of the second cylindrical wall in the axial direction of the first housing. In the radial direction of the first housing, the distance from the end of the third cylindrical wall near the detector to the second cylindrical wall is less than the distance from the end of the third cylindrical wall away from the detector to the second cylindrical wall.

6. The electronic nose device according to claim 5, characterized in that, The ends of the first cylindrical wall and the second cylindrical wall near the detector are flush with the end of the first housing near the detector. The end of the third cylindrical wall near the detector is further away from the detector than the end of the second cylindrical wall near the detector, and the end of the third cylindrical wall away from the detector is closer to the detector than the end of the first cylindrical wall away from the detector.

7. The electronic nose device according to claim 1, characterized in that, The detector includes: The second housing has a space inside that communicates with the active air intake channel and the passive air intake channel; A partition cylinder is fixed inside the second housing by a second connecting structure, and at least partially divides the space inside the second housing into a detection channel and a sewage discharge channel surrounding the detection channel; A gas sensor is fixedly installed in the partition cylinder and located within the detection channel.

8. The electronic nose device according to claim 7, characterized in that, The detector also includes a partition disposed inside the partition cylinder and used to form the detection channel into a meandering channel.

9. The electronic nose device according to claim 7, characterized in that, The detector also includes a breathable and dirt-blocking membrane fixed inside the second housing. The breathable and dirt-blocking membrane is configured to completely cover the end of the detection channel facing the air curtain, and only open the bottom area of ​​the end of the sewage channel facing the air curtain.

10. The electronic nose device according to claim 7, characterized in that, The detector further includes a first hook disposed on the second housing, and the air curtain further includes a second hook disposed on the main body of the device and capable of engaging with the first hook.

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