Air curtain type smell detector for realizing simultaneous and same-direction blowing and sucking functions by adopting single fan

Abstract

The invention relates to an air curtain type odor detector for realizing simultaneous and same-direction blowing and sucking functions by adopting a single fan, which comprises a gas inlet, a gas outlet, a grab handle shell and a working head arranged at the head of the grab handle shell, the working head is provided with a detection cavity and an air curtain cavity positioned at the periphery of the detection cavity, and an inner cavity of the grab handle shell is provided with a suction cavity and a reverse blowing cavity. An inlet of the suction cavity is communicated with the detection cavity, the reverse blowing cavity comprises a steering arc arranged at an outlet of the suction cavity and a reverse blowing section located on the periphery of the suction cavity, the steering arc is used for steering airflow at the outlet of the suction cavity into the reverse blowing section, the reverse blowing section is communicated with the air curtain cavity, and the air curtain cavity is communicated with the detection cavity. The air inlet is formed in the detection cavity, the air outlet is formed in the air curtain cavity, the suction cavity comprises a fan section provided with a fan, and air is sucked in from the detection cavity through the fan, is detected, is turned to the air curtain cavity through a turning arc, forms jet flow in the air curtain cavity and is discharged.

Description

Technical Field

[0001] This invention belongs to the field of odor detection technology, specifically relating to an air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction. Background Technology

[0002] Modern odor detection technology, centered on machine olfaction (electronic nose), typically comprises three core modules: a gas sensor array; a signal processing unit; and a pattern recognition system. However, it faces the following technological bottlenecks: (1) Insufficient detection accuracy due to environmental interference.

[0003] The nonlinear chaotic nature of natural wind fields poses a challenge to odor detection. Random fluctuations in near-surface wind speed and direction disrupt the diffusion paths of odor molecules, making it difficult for sensors to capture stable concentration gradient signals. Changes in temperature and humidity can cause baseline drift in sensors. Dust and background gas impurities can also compete with target odor molecules for sensor sensitive sites, further reducing detection specificity.

[0004] (2) Limitations in the directionality and range of detection.

[0005] Traditional odor detectors mostly use passive sampling mode, which has a weak ability to determine the location of odor sources, is highly dependent on the stability of ambient airflow, and is prone to judgment failure.

[0006] (3) The contradiction between hardware integration and cost.

[0007] High-precision odor detection devices often face the dual constraints of size and power consumption, making them difficult to embed in smart homes or portable devices. The reliance on imported core components further increases costs.

[0008] (4) Deficiency in recognizing complex odors.

[0009] Existing equipment has a weak ability to distinguish between gases with similar structures, such as benzene and toluene, and often fails to detect them in scenarios where kitchen fumes and perfumes are mixed.

[0010] Air curtain technology uses a fan to drive airflow, forming a curtain-like airflow barrier with specific speed and thickness. This barrier enables spatial isolation, airflow guidance, and impurity blocking. Its application in odor control has already seen initial technological accumulation. Air curtains can create locally clean detection areas, providing a stable sampling environment for sensor arrays. In public safety settings such as airports and customs, there is an urgent need for trace detection of drugs and explosives. The directional air collection function of air curtains can concentrate diffused characteristic odor molecules onto the sensor, improving detection sensitivity.

[0011] Existing fusion technologies still have significant shortcomings: the coordinated control of air curtain parameters and sensor sampling lacks dynamic adaptation mechanisms and manufacturing techniques, relying more on fixed programs rather than real-time airflow data adjustment; airflow disturbances in the air curtain may affect the stability of sensor response, and an optimized airflow field design scheme has not yet been formed; it is difficult to balance equipment integration and cost control, limiting large-scale applications.

[0012] Therefore, developing a wind-curtain type odor detector that combines high anti-interference capability, wide detection range, and low cost has significant theoretical and practical value. Summary of the Invention

[0013] The main objective of this invention is to address the problems mentioned above by providing an air curtain-type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0014] The purpose of this invention is to provide an air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions. Its main features include a gas inlet, a gas outlet, a handle shell, and a working head located at the head of the handle shell. The working head has a detection cavity and an air curtain cavity located around the detection cavity. The inner cavity of the handle shell has a suction cavity and a backflush cavity. The inlet of the suction cavity is connected to the detection cavity. The backflush cavity includes a deflecting arc located at the outlet of the suction cavity and a backflush section located around the suction cavity. The deflecting arc is used to deflect the airflow from the outlet of the suction cavity into the backflush section. The backflush section is connected to the air curtain cavity. The gas inlet is located in the detection cavity, and the gas outlet is located in the air curtain cavity. The suction cavity includes a fan section with a fan. Through the fan, gas is drawn into the detection cavity, detected, and then deflected by the deflecting arc to the air curtain cavity, where it forms a jet and is discharged.

[0015] Preferably, the working head has an inner guide wall and an outer guide wall sleeved outside the inner guide wall. The detection cavity is located in the inner cavity of the inner guide wall, and the air curtain cavity is located in the spatial slit between the inner guide wall and the outer guide wall. The inner wall of the inner guide wall is provided with several sockets, detectors, and oblique guide ribs, and the detectors are installed on the sockets.

[0016] Preferably, the inner guide wall is a flat-headed cone shape, the inner guide wall forms an angle of 30°±0.5° with the central axis of the detector, and the outline of the outer guide wall matches the outline of the inner guide wall.

[0017] Preferably, the suction chamber includes a buffer section, a flow stabilizing section, a rectification section, and a pressurizing section. The air inlet of the fan is connected to the flow stabilizing section and the buffer section in sequence, and the air outlet of the fan is connected to the rectification section and the pressurizing section in sequence. The rectification section has the same inner diameter as the fan section, the pressurizing section has a gradually decreasing inner diameter relative to the rectification section, and the flow stabilizing section has a gradually decreasing inner diameter relative to the buffer section.

[0018] Preferably, the inner wall of the buffer section is provided with a concave spiral arc, the inner wall of the flow stabilizing section is provided with an annular groove, the inner wall of the rectifying section is provided with guide vanes, and the inner wall of the pressurizing section is provided with convex guide ribs. The pressurization section is a two-stage gradually narrowing section.

[0019] Preferably, a sound insulation layer is provided between the suction chamber and the backflush section.

[0020] Preferably, the arc surface of the turning arc is provided with a flow rectifier, and the inner wall of the backflush section is provided with straight guide ribs.

[0021] Preferably, a reinforcing ring is provided at the outlet of the air curtain cavity, the reinforcing ring is located on the outer periphery of the outlet of the air curtain cavity, and a jet hole inclined outward is provided on the inner side of the reinforcing ring.

[0022] Preferably, the end of the working head is provided with an air curtain, which has a stabilizing ring, a dustproof net and a light strip.

[0023] Preferably, the detector includes an electronic control unit, which is electrically connected to both the suction chamber and the detection chamber.

[0024] This invention relates to an air curtain-type odor detector that uses a single fan to achieve simultaneous, unidirectional blowing and suction. Through core technological innovations such as dynamic air curtain isolation, multimodal sensing, low-power design, superior intelligent algorithms, strong anti-interference capabilities, multi-scenario adaptability, and real-time early warning, it overcomes the limitations of traditional detection equipment, providing efficient and reliable solutions for environmental monitoring, industrial safety, and healthcare. In the future, with the further development of MEMS technology and AI algorithms, this type of device is expected to achieve new breakthroughs in smaller size, lower power consumption, and higher accuracy, propelling odor detection technology into the intelligent era. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction functions.

[0026] Figure 2 This is a schematic diagram of the detection chamber in the air curtain-type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0027] Figure 3 This is a schematic diagram of the suction chamber in the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0028] Figure 4 This is a schematic diagram of the turning arc structure in the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction functions.

[0029] Figure 5 This is a schematic diagram of the back-blowing section in the air curtain-type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0030] Figure 6 This is a schematic diagram of the air curtain cavity in the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0031] Figure 7 This is a schematic diagram of the side structure of the air curtain cover in the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0032] Figure 8 This is a schematic diagram of the front of the air curtain cover in the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0033] Figure 9 This is a schematic diagram of the handle shell structure of the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction.

[0034] Figure label: 1. Odor Detector; 2. Detection Chamber; 3. Guide Surface; 4. Socket; 5. Detector; 6. Angled Guide Rib; 7. Connecting Ring; 8. Suction Chamber; 9. Buffer Section; 10. Concave Spiral Arc; 11. Flow Stabilizing Section; 12. Annular Groove; 13. Fan Section; 14. Elastic Support; 15. Rectifying Section; 16. Guide Blade; 17. Initial Pressure Section; 18. Pressurization Section; 19. Re-pressure Section; 20. Mirror Inner Wall; 21. Sound Insulation Layer; 22. Dustproof Net; 23. Backflush Chamber; 24. Turning Arc; 25. Rectifier Grid; 26. Backflush Section; 27. Straight Guide Rib; 28. Air Curtain Chamber; 29. ​​Gas Outlet; 30. Reinforcing Ring; 31. Jet Orifice; 32. Air Curtain Cover; 33. Flow Stabilizing Ring; 34. Dustproof Net; 35. LED Light Strip; 36. Handle Shell; 37. Display Screen; 38. Handle button; 39 Electronic control board Detailed Implementation

[0035] To provide a clearer understanding of the technical content of this invention, the following embodiments are provided in detail. However, it is important to note that these descriptions are merely for further illustrating the features and advantages of this invention, and not for limiting the scope of the claims.

[0036] like Figures 1 to 9 The image shows a specific embodiment of the air curtain type odor detector of the present invention, which uses a single fan to achieve simultaneous unidirectional blowing and suction functions. The detector includes a gas inlet, a gas outlet 29, a handle housing 36, and a working head disposed at the head of the handle housing 36. The working head has a detection cavity 2 and an air curtain cavity 28 located around the detection cavity 2. The inner cavity of the handle housing 36 has a suction cavity 8 and a back-blowing cavity 23. The inlet of the suction cavity 8 is connected to the detection cavity 2. The back-blowing cavity 23 includes a deflection arc 24 disposed at the outlet of the suction cavity 8 and a back-blowing section 26 located around the suction cavity 8. The deflection arc 24 is used to deflect the airflow from the outlet of the suction cavity 8 into the back-blowing section 26. The back-blowing section 26 is connected to the air curtain cavity 28. The gas inlet is disposed in the detection cavity 2, and the gas outlet 29 is disposed in the air curtain cavity 28. The suction cavity 8 includes a fan section 13 with a fan.

[0037] Gas is drawn into the detection chamber and detected by the fan, then turned by the turning arc to the air curtain chamber and discharged as a jet in the air curtain chamber. Based on the detector of the present invention, the detection chamber, the air curtain chamber and the backflush chamber are cleverly designed. The airflow in the detection chamber is used to detect odors, the jet in the air curtain chamber is responsible for blocking the external airflow, and the backflush chamber carries the airflow turning.

[0038] Based on the air curtain type odor detector of the present invention, the total airflow circulation path is as follows: air is drawn in from the target point 500mm away → detection chamber (low-pressure airflow) → suction chamber (high-pressure airflow) → backflush chamber (laminar airflow) → 30° air curtain chamber (conical airflow) and the air curtain is discharged.

[0039] The fan section 13 can be equipped with a fan with blades or a spiral umbrella wheel. The fan can be a high-pressure, high-speed brushless fan section with a speed of 110,000 rpm, 160,000 rpm, or 200,000 rpm. The elastic support 14 is set on the outer periphery of the fan section 13 to ensure the stability of the fan and absorb more than 60% of the vibration energy. The fan section 13 generates high-speed rotation through voltage drive to provide compressed airflow power to the suction chamber 8, and converts the axial pre-accelerated airflow into radial high-pressure airflow.

[0040] The working head has an inner guide wall and an outer guide wall sleeved outside the inner guide wall. The detection cavity 2 is located in the inner cavity of the inner guide wall, and the air curtain cavity 28 is located in the narrow space between the inner and outer guide walls. The inner wall of the inner guide wall is provided with several sockets 4, detectors 5, and oblique guide ribs 6. The detectors 5 are mounted on the sockets 4. Figure 2 As shown, the working head can be connected to the suction chamber through the connecting tube 7, which can be connected by a snap-fit ​​or a thread.

[0041] The air curtain cavity 28 can be made of ABS or PC alloy materials to form a conical guide surface with an inclination of 30°, which forms a jet through the conical annular slit.

[0042] The inner guide wall is flat-headed and conical, and the inner guide wall forms an angle of 30°±0.5° with the central axis of the detector. The outline of the outer guide wall matches the outline of the inner guide wall.

[0043] The inner and outer guide walls can be made of ABS or PC alloy materials. The guide surface 3 of the inner and outer guide walls can be a conical guide surface with a generatrix length of 40mm and an angle of 30°±0.5°.

[0044] The socket 4 can be a recessed socket for front-panel locking and fixing, which can be distributed on the conical inner wall of the detection cavity, allowing for the insertion and replacement of the required detectors according to their application. The detector 5 can be a variety of optical, nanowire, metal oxide (MOX), chemical, electrochemical, and semiconductor miniature detectors, such as chips, sensors, and their sensor arrays. The detectors 5 are distributed in the recessed sockets on the conical inner wall of the detection cavity according to the airflow direction, or they can also be installed on the side of the slightly convex inclined guide ribs 6, for detecting the distance, odor characteristics, and odor concentration of objects in front.

[0045] The oblique guide ribs 6 can be evenly distributed on the inner wall of the cone of the detection cavity 2, so as to uniformly diffuse and avoid eddies, thereby guiding the detected airflow to converge and flow in the direction of the oblique guide ribs.

[0046] The suction chamber 8 includes a buffer section 9, a flow stabilizing section 11, a rectifier section 15, and a pressurizing section 18. The air inlet of the fan is connected sequentially to the flow stabilizing section 11 and the buffer section 9, and the air outlet of the fan is connected sequentially to the rectifier section 15 and the pressurizing section 18. The rectifier section 15 has the same inner diameter as the fan section 13. The pressurizing section 18 has a gradually decreasing inner diameter relative to the rectifier section 15, and the flow stabilizing section 11 has a gradually decreasing inner diameter relative to the buffer section 9. The suction chamber 8 can be made of glass fiber reinforced PPS material with a heat distortion temperature of 120℃ and injection molded. A negative pressure channel is formed in the suction chamber by the fan. A dustproof net 22, which can be made of 500-mesh stainless steel mesh, can be installed in front of the negative pressure channel to prevent dust from clogging the channel, extend the cleaning cycle, and further guide the airflow direction through the "micro-guiding" effect of the mesh.

[0047] The inner wall of the buffer section 9 is provided with a concave spiral arc 10. The airflow is guided smoothly by the horn-shaped opening of the detection chamber 2 and the concave spiral arc 10, reducing eddies generated by airflow impact and guiding the air to enter smoothly along the axial direction. The inner wall of the flow stabilization section 11 is provided with an annular groove 12. The airflow is "secondarily stabilized" within the annular groove 12, eliminating the remaining approximately 15% of airflow pulsation and ensuring that the airflow stability entering the fan section 13 is ≥95%.

[0048] The inner wall of the rectifying section 15 is provided with guide vanes 16, which are aligned with the rotation direction of the axial flow fan. These vanes are used to convert the "rotating airflow" at the fan outlet into "axial straight airflow," reducing energy loss caused by airflow rotation. The pressurizing section 18 is a two-stage tapered section. For example, it can be a two-stage variable taper pressurizing section 18 with an initial converging section 17 with a converging cone orifice of 8° and a subsequent converging section 19 with a converging cone orifice of 5°. The initial converging section 17 is located at the rear end of the cylindrical rectifying section 15 extending along the airflow direction, used to rapidly increase pressure; the subsequent converging section 19 is located at the rear end of the conical ring of the initial converging section 17, used to stabilize pressure. Its mirror-finished inner wall 20 can be provided with convex guide ribs 6, which are used to reduce the frictional resistance along the path of the rapidly pressurized airflow and avoid airflow rotation loss, guiding and ensuring that the airflow flows smoothly along the axial direction of the cavity wall into the backflush chamber.

[0049] A sound insulation layer 21 is provided between the suction chamber 8 and the backflushing section 26. It can be made of a 3mm thick elastic material to reduce vibration and reduce the operating noise of the odor detector to below 55dB.

[0050] The steering arc 24 has a rectifier grid 25 on its arc surface, and the inner wall of the backflush section 26 has a straight guide rib 27. The steering arc 24 can be made of ABS or PC alloy material and is made into a 90° concave arc shape. The center of its concave surface is aligned with and fixed at the rear end of the booster section 18 to reduce the gas vortex caused by airflow collision in the concave surface of the steering arc 24.

[0051] The spacing between the grating plates of the rectifier 25 can be around 6mm. By adjusting its curvature and tilt, it can be made to perfectly match the airflow trajectory. The rectifier 25 is fixed on the concave arc surface of the turning arc 24, which can break the remaining small vortices into "micro-turbulence", avoid local airflow congestion, and ensure that the airflow has enough distance to complete the smooth "axial → radial" output of the airflow.

[0052] The backflush section 26 of this invention can be formed by a gradually changing cylindrical shape from "cylindrical → slightly larger cylindrical → cylindrical", avoiding "impact separation" of the airflow caused by abrupt changes in cross-section and direction, and maintaining stable pressure (airflow direction: axial front end, straight flow). The straight guide ribs 27 on the backflush section 26 can guide the high-pressure turbulent airflow to converge and flow in a straight direction.

[0053] A reinforcing ring 30 is provided at the outlet of the air curtain cavity 28. The reinforcing ring 30 is located on the outer periphery of the outlet of the air curtain cavity 28. The inner side of the reinforcing ring 30 is provided with a jet hole 31 that is inclined outward to guide the airflow at part of the edge of the air curtain cavity 28 to "slightly expand outward". The jet hole 31 can be 0.3 mm in diameter and face outward at a 5° angle with the edge of the air curtain, using the high pressure (750 Pa) of the main airflow to form an "edge micro-jet".

[0054] The gas outlet 29 can be an outlet with rounded R2 corners on the edge, located on the inner side of the outer end of the guide surface 3, to avoid airflow vortices when the gas is discharged and to ensure the integrity of the air curtain edge.

[0055] The working head is equipped with an air curtain 32 at its end. The air curtain 32 has a stabilizing ring 33, a dustproof net 34, and an LED light strip 35. The air curtain 32 is a circular hollow mesh that can be snapped onto the front plane of the air curtain cavity 28. It is used to block debris, guide airflow, and prevent dust from entering the detection cavity 2.

[0056] The stabilizing ring 33 is a porous metal stabilizing ring that allows for more uniform airflow from the air curtain and further reduces airflow turbulence, for example, from approximately 15% to around 5%. The dust filter 34 ensures that while air is drawn in at high speed, it effectively filters dust and debris from the air, preventing them from entering the high-speed motor and preventing foreign objects from getting stuck in the impeller and causing damage. The LED light strip 35 illuminates the detection area in front of the air curtain cavity 28.

[0057] The detector includes an electronic control unit 39, which is electrically connected to the suction chamber 8 and the detection chamber 2.

[0058] like Figure 9 As shown, the grip shell 36 also includes a display screen 37, a grip button 38, and a Type-C charging port and a power switch 40 at the bottom. The display screen 37 is used to display the type and concentration of odor detected by the odor detector. The grip button 38 can be located in the front center of the grip shell 36, in the natural thumb pressing area, for anti-accidental touch design (pressing force ≥1.5N). The electronic control unit 39 can adopt a 32-bit packaged component, a lithium polymer battery, and a power management IC, and is located on the inner side of the rear of the grip shell 36. The 32-bit packaged component is used for signal processing and pattern recognition, responsible for preprocessing the raw signal output by the sensor, such as noise reduction and normalization, to eliminate interference from environmental factors such as temperature and humidity, and classifying and recognizing feature signals based on machine learning, deep learning, and other algorithms. The lithium polymer battery and power management IC are used to control the speed and gear switching of the fan section and control the status switching of the display screen.

[0059] The detector of this invention adopts an integrated compact structure of "handle + detector head", with a total length controlled within 200 mm and a weight ≤500 grams, facilitating one-handed operation. The working head is flat and conical, with a diameter of 80 mm and a length of 90 mm, housing the core components. The handle features an arc-shaped ergonomic design, a length of 110 mm, and a non-slip textured surface to fit the curvature of the hand. The outer shell is injection molded from ABS engineering plastic, combining lightweight design with structural strength. The front end of the detector head has an air inlet and an air outlet, while the bottom of the handle shell has a Type-C charging port and a power switch. The overall design is gray and white, meeting the clean visual requirements of medical and retail scenarios. Based on the air curtain type odor detector of this invention, the internal airflow state test is as follows: ; This invention relates to an air curtain-type odor detector that uses a single fan to achieve simultaneous, unidirectional blowing and suction. Through core technological innovations such as dynamic air curtain isolation, multimodal sensing, low-power design, superior intelligent algorithms, strong anti-interference capabilities, multi-scenario adaptability, and real-time early warning, it overcomes the limitations of traditional detection equipment, providing efficient and reliable solutions for environmental monitoring, industrial safety, and healthcare. In the future, with the further development of MEMS technology and AI algorithms, this type of device is expected to achieve new breakthroughs in smaller size, lower power consumption, and higher accuracy, propelling odor detection technology into the intelligent era.

[0060] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, this specification should be considered illustrative rather than restrictive.

Claims

1. An air curtain-type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction, characterized in that, The device includes a gas inlet, a gas outlet, a grip shell, and a working head located at the head of the grip shell. The working head has a detection chamber and an air curtain chamber located around the detection chamber. The inner cavity of the grip shell has a suction chamber and a backflush chamber. The inlet of the suction chamber is connected to the detection chamber. The backflush chamber includes a deflecting arc located at the outlet of the suction chamber and a backflush section located around the suction chamber. The deflecting arc is used to deflect the airflow from the outlet of the suction chamber into the backflush section. The backflush section is connected to the air curtain chamber. The gas inlet is located in the detection chamber, and the gas outlet is located in the air curtain chamber. The suction chamber includes a fan section with a fan. Through the fan, gas is drawn in from the detection chamber, detected, and then deflected by the deflecting arc to the air curtain chamber, where it forms a jet and is discharged.

2. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions as described in claim 1, characterized in that, The working head has an inner guide wall and an outer guide wall sleeved outside the inner guide wall. The detection cavity is located in the inner cavity of the inner guide wall. The air curtain cavity is located in the space between the inner guide wall and the outer guide wall. The inner wall of the inner guide wall is provided with several sockets, detectors and oblique guide ribs. The detectors are installed on the sockets.

3. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions as described in claim 2, characterized in that, The inner guide wall is flat-headed and conical, and the inner guide wall forms an angle of 30°±0.5° with the central axis of the detector. The outline of the outer guide wall matches the outline of the inner guide wall.

4. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction as described in claim 1, characterized in that, The suction chamber includes a buffer section, a flow stabilizing section, a rectification section, and a pressurizing section. The air inlet of the fan is connected to the flow stabilizing section and the buffer section in sequence, and the air outlet of the fan is connected to the rectification section and the pressurizing section in sequence. The rectification section has the same inner diameter as the fan section, the pressurizing section has a gradually decreasing inner diameter relative to the rectification section, and the flow stabilizing section has a gradually decreasing inner diameter relative to the buffer section.

5. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions according to claim 4, characterized in that, The inner wall of the buffer section is provided with a concave spiral arc, the inner wall of the flow stabilizing section is provided with an annular groove, the inner wall of the rectifying section is provided with guide vanes, and the inner wall of the pressurizing section is provided with convex guide ribs. The pressurization section is a two-stage gradually narrowing section.

6. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions as described in claim 1, characterized in that, A sound insulation layer is provided between the suction chamber and the backflush section.

7. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions as described in claim 1, characterized in that, The steering arc surface is provided with a flow rectifier, and the inner wall of the backflush section is provided with straight guide ribs.

8. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions as described in claim 1, characterized in that, A reinforcing ring is provided at the outlet of the air curtain cavity. The reinforcing ring is located on the outer periphery of the outlet of the air curtain cavity, and a jet hole inclined outward is provided on the inner side of the reinforcing ring.

9. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions as described in claim 1, characterized in that, The working head is equipped with an air curtain at its end, and the air curtain has a stabilizing ring, a dustproof net and a light strip.

10. The air curtain type odor detector that uses a single fan to achieve simultaneous unidirectional blowing and suction functions according to claim 1, characterized in that, The detector includes an electronic control unit, which is electrically connected to both the suction chamber and the detection chamber.

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