An electronic nose device

Abstract

This application discloses an electronic nose device, including a housing, a detection component, an air curtain, and a power component. The housing has an air inlet channel and an air outlet channel surrounding it. The detection component is placed inside the air inlet channel for qualitative and quantitative detection of the components of the gas to be tested passing through it. The air curtain is installed on the housing, with its air inlet connected to the air inlet channel and its air outlet surrounding the air inlet and connected to the air outlet channel. The power component is divided into two parts: one part is located in the air outlet channel and is used to draw in outside air and discharge it through the air outlet of the air curtain, forming a hollow cylindrical or conical air curtain; the other part is located in the air inlet channel and is responsible for introducing the gas to be tested, which is enveloped by the air curtain, into the air inlet channel from the front of the air outlet of the air curtain. This electronic nose device can effectively improve the detection efficiency of the gas to be tested, ensuring a faster and more accurate detection process, and meeting the practical needs of adjustable orientation and more precise positioning of gas detection in actual applications.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electronic nose device technology, and more specifically, the present invention relates to an electronic nose device. Background Technology

[0002] An electronic nose device is a biomimetic olfactory organ composed of numerous detection components. It detects the components of an object through the free diffusion of gas molecules. Electronic nose devices offer significant advantages such as small size, low cost, low power consumption, and fast response, and have been widely used in various fields including food, medicine, environmental monitoring, and industrial production. The working principle of an electronic nose device is based on the interaction between the target component and the detection components. When the target component in the gas is captured by the detection components, it undergoes a physical or chemical reaction with a specific material on the surface of the component, thereby changing the conductivity, capacitance, or other properties of the sensor. The detection component then identifies different odors by detecting these changes. The core of the electronic nose device is the detection component, made of various materials specific to different target components. Each detection component has a high responsiveness to a specific target component or a group of target components.

[0003] However, despite the great potential of electronic nose devices in many fields, their detection efficiency is often low due to various factors (such as performance limitations of detection components or environmental factors), making it difficult to meet the demand for faster and more accurate gas detection in practical applications. Summary of the Invention

[0004] To address one or more of the technical problems mentioned above, this invention provides an electronic nose device that can effectively improve the detection efficiency of the gas to be detected, ensuring a faster and more accurate detection process, thereby meeting the practical application requirements for faster and more accurate gas detection.

[0005] This invention provides an electronic nose device, comprising:

[0006] A housing, comprising an air inlet channel and an air outlet channel disposed therein, the air outlet channel being disposed circumferentially around the air inlet channel;

[0007] A detection component is arranged in the air inlet channel of the housing and performs qualitative and quantitative detection on the components to be detected in the gas to be tested passing through the air inlet channel.

[0008] An air curtain is disposed on the housing and includes an air inlet communicating with the inlet of the air inlet channel and an air outlet surrounding the air inlet and communicating with the outlet of the air outlet channel.

[0009] A power assembly, one part of which is arranged in the air outlet channel of the housing, is used to introduce air from outside the housing into the air outlet channel and discharge it from the air outlet of the air curtain to form a hollow cylinder or hollow cone air curtain in front of the air outlet of the air curtain. The other part of the power assembly is arranged in the air inlet channel of the housing, and is used to introduce the gas to be tested, which is in front of the air outlet of the air curtain and is wrapped by the air curtain, into the air inlet channel.

[0010] Furthermore, the power assembly includes a rotating source disposed on the central axis of the air inlet channel, a first impeller disposed on the rotating source and located within the air inlet channel, and a second impeller fixedly disposed on the first impeller and located within the air outlet channel. The first impeller can introduce the gas to be tested into the air inlet channel when rotated by the rotating source, and the second impeller can introduce the air into the air outlet channel when rotated by the first impeller. The blades of the second impeller and the blades of the first impeller are, respectively, forward-curved blades and backward-curved blades.

[0011] Furthermore, the housing also includes an air intake channel located at the outlet of the air outlet channel. The power assembly includes a rotating source located in the air intake channel, a first impeller located on the rotating source and within the air intake channel, and an air multiplier located outside the housing and communicating with the air intake channel. The first impeller can introduce the gas to be tested into the air intake channel when rotated by the rotating source. The air multiplier is used to generate a traction airflow in the air intake channel and use the traction airflow to force the air outside the housing into the air outlet channel and form the air curtain when leaving the air intake channel. The blades of the first impeller are backward-curved blades.

[0012] Furthermore, the air inlet channel includes an inlet section for accommodating the rotating source and the first impeller, and a detection section connected to and downstream of the inlet section. The electronic nose device also includes a breathable and dirt-blocking membrane disposed between the inlet section and the detection section. The electronic nose device also includes a partition cylinder fixedly disposed in the air inlet channel and dividing the detection section into a first sub-segment and a second sub-segment. The breathable and dirt-blocking membrane covers the inlet of the partition cylinder. The detection component is disposed in the first sub-segment, and the second sub-segment surrounds the first sub-segment and is not covered by the breathable and dirt-blocking membrane.

[0013] Furthermore, the breathable and dirt-resistant membrane is a porous film made of polytetrafluoroethylene.

[0014] Furthermore, the electronic nose device also includes a baffle fixed inside the partition cylinder and used to form the first sub-segment into a meandering channel.

[0015] Furthermore, the electronic nose device includes a semiconductor cooler and an electric heater disposed at the bottom of the partition cylinder.

[0016] Furthermore, the air curtain includes a cylindrical or conical outer cover, an inner cover disposed within the outer cover and also cylindrical or conical, an inner channel formed within the inner cover, and an outer channel forming between the outer cover and the inner cover, wherein the inner channel has the air inlet and communicates with the air inlet channel, and the outer channel has the air outlet and communicates with the air outlet channel.

[0017] Furthermore, the detection component includes semiconductor gas sensors, electrochemical gas sensors, microstructure gas sensors and / or surface acoustic wave gas sensors, as well as gas-liquid sensors, temperature sensors and / or humidity sensors. The electronic nose device also includes a logic control unit electrically connected to the detection component.

[0018] Furthermore, the electronic nose device also includes a purification component disposed within the air inlet channel and / or air outlet channel, wherein the purification component includes activated carbon, ultraviolet lamp and / or photocatalytic coating.

[0019] The electronic nose device provided in this embodiment uses a power component to introduce the gas to be tested from the air outlet of the air curtain of the housing into the air inlet channel. The gas is then drawn into a detection component located within the air inlet channel for qualitative and quantitative detection of the components to be tested. The gas is then discharged from the air inlet channel, enabling the electronic nose device to identify and analyze the components to be tested. Furthermore, the power component can introduce air from outside the housing into the air outlet channel and discharge it from the air outlet of the air curtain, forming a hollow cylindrical or hollow conical air curtain in front of the air outlet. Since the air outlet channel is located circumferentially around the air inlet channel, the air curtain can envelop the gas to be tested (within the air curtain), effectively isolating it from the air outside the housing. This prevents adverse effects such as turbulence from the outside air on the gas to be tested within the air curtain, thereby improving the stability of the gas to be tested within the air curtain drawn in by the power component. The bidirectional airflow channel, where the power component drives the flow of the gas to be tested in the inlet channel and the air in the outlet channel, significantly improves the flow efficiency of the gas to be tested within the electronic nose device. The combined effect of the air curtain and the dual airflow channel enhances the detection capability and response speed of the electronic nose device, thus making it more widely applicable in fields such as environmental monitoring, food safety, and medical diagnosis. Attached Figure Description

[0020] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0021] Figure 1 A front view of an electronic nose device provided in an embodiment of the present invention is shown;

[0022] Figure 2 A schematic diagram of the structure of an electronic nose device provided in an embodiment of the present invention is shown;

[0023] Figure 3 A cross-sectional view of an electronic nose device with an air multiplier provided in an embodiment of the present invention is shown;

[0024] Figure 4 A cross-sectional view of an electronic nose device with a second impeller provided in an embodiment of the present invention is shown;

[0025] Figure 5 A schematic diagram of the rotating source, the first impeller, and the housing provided in an embodiment of the present invention is shown.

[0026] 1. Shell; 11. Air inlet duct; 111. Inlet section; 112. Detection section; 1121. First sub-section; 1122. Second sub-section; 12. Air outlet duct; 13. Exhaust duct;

[0027] 2. Detection components;

[0028] 3. Air curtain cover; 31. Outer cover; 311. Outer passage; 3111. Air outlet; 32. Inner cover; 321. Inner passage; 3211. Air inlet;

[0029] 4. Power assembly; 41. Rotation source; 411. Motor; 412. Fan head; 42. First impeller; 43. Air multiplier; 44. Support frame; 45. Second impeller;

[0030] 5. Breathable and dirt-resistant membrane;

[0031] 6. Partition cylinder;

[0032] 7. Partitions;

[0033] 8. Purification components; 81. Activated carbon; 82. Ultraviolet lamp; 83. Photocatalytic coating;

[0034] 9. Semiconductor refrigerators;

[0035] 10. Electric heater. Detailed Implementation

[0036] 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.

[0037] Figure 1 This figure shows a front view of an electronic nose device provided in this embodiment. Figure 2 A schematic diagram of the electronic nose device provided in this embodiment is shown. Figure 1 and Figure 2 As shown, this embodiment provides an electronic nose device, which includes a housing 1, a detection component 2, an air curtain 3, and a power component 4. The housing 1 includes an air inlet channel 11 and an air outlet channel 12 disposed therein, with the air outlet channel 12 arranged circumferentially around the air inlet channel 11. The detection component 2 is disposed within the air inlet channel 11 of the housing 1 and performs qualitative and quantitative detection on the components to be detected in the gas to be tested passing through the air inlet channel 11. The air curtain 3 is disposed on the housing 1 and includes an air inlet 3211 partially communicating with the inlet of the air inlet channel 11, and an air outlet 3111 surrounding the air inlet 3211 and communicating with the outlet of the air outlet channel 12. One part of the power assembly 4 is arranged in the air outlet channel 12 of the housing 1, which is used to introduce air from outside the housing 1 into the air outlet channel 12 and discharge it from the air outlet 3111 of the air curtain 3, so as to form a hollow cylinder or hollow cone air curtain in front of the air outlet 3111 of the air curtain 3. The other part of the power assembly 4 is arranged in the air inlet channel 11 of the housing 1, which is used to introduce the gas to be tested in front of the air outlet 3111 of the air curtain 3 and wrapped by the air curtain into the air inlet channel 11.

[0038] The electronic nose device provided in this embodiment uses a power component 4 to introduce the gas to be tested in front of the air outlet 3111 of the air curtain 3 of the housing 1 into the air inlet channel 11, and draws the gas to be tested into the detection component 2 located in the air inlet channel 11 to perform qualitative and quantitative detection of the components to be tested in the gas to be tested. Then the gas to be tested is discharged from the air inlet channel 11, so that the electronic nose device can identify and analyze the components to be tested in the gas to be tested. Furthermore, the power assembly 4 can also introduce air from outside the housing 1 into the air outlet 12 and discharge it from the air outlet 3111 of the air curtain 3, forming a hollow cylindrical or hollow conical air curtain in front of the air outlet 3111 of the air curtain 3. Since the air outlet 12 is arranged around the air inlet 11, the air curtain formed by the air can envelop the gas to be tested (within the air curtain), thereby isolating the gas to be tested from the air outside the housing 1. This avoids the air outside the air curtain from causing turbulence or other adverse effects on the gas to be tested inside the air curtain, thus improving the stability of the gas to be tested drawn into the air curtain by the power assembly 4. The bidirectional airflow channel method by which the power assembly 4 drives the gas to be tested in the air inlet 11 and the air in the air outlet 12 also greatly improves the flow efficiency of the gas to be tested in the electronic nose device. The combined effect of the air curtain and the dual airflow channels enhances the detection capability and response speed of the electronic nose device, thus making it more widely applicable in fields such as environmental monitoring, food safety, and medical diagnosis.

[0039] Figure 3 A cross-sectional view of the electronic nose device with an air multiplier 43 provided in this embodiment is shown. Figure 3 and combined Figure 1 and Figure 2As shown, in this embodiment, the housing 1 also includes an air intake channel 13 located at the outlet of the air outlet channel 12. The power assembly 4 includes a rotation source 41 located in the air intake channel 11, a first impeller 42 located on the rotation source 41 and in the air intake channel 11, and an air multiplier 43 located on the housing 1. The first impeller 42 can introduce the gas to be tested into the air intake channel 11 when it is rotated by the rotation source 41. The injection hole of the air multiplier 43 is located in the air intake channel 13 or the air curtain 3 and sprays the traction airflow toward the air outlet 3111, so that the traction airflow draws the air in the air outlet channel 12 before leaving the air outlet 3111 and forms an air curtain after leaving the air outlet 3111. The blades of the first impeller 42 are backward-curved blades. The rotation source 41 generates power to rotate, driving the first impeller 42 mounted on it to rotate as well. Since the blades of the first impeller 42 are backward-curved blades, when the first impeller 42 rotates, it can introduce the gas to be tested in front of the air outlet 3111 of the air curtain into the air inlet channel 11, so as to introduce the gas to be tested in front of the air outlet 3111 of the air curtain 3 of the housing 1 into the air inlet channel 11, and draw the gas to be tested into the detection component 2 located in the air inlet channel 11 for qualitative and quantitative detection of the components to be tested in the gas to be tested. The air multiplier 43 can form a traction airflow in the air intake channel 13 by generating a high-speed jet, thereby using the air pressure difference generated by the traction airflow when it leaves the air intake channel 13 and the air in the outlet of the air outlet channel 12 to cause the air in the air outlet channel 12 to flow with the traction airflow, thereby causing the air outside the housing 1 to enter the air outlet channel 12 and form a hollow cylindrical or hollow conical air curtain in front of the air outlet 3111 of the air curtain 3.

[0040] It should be noted that in this embodiment, the gas to be tested is a selected portion of air, and the component to be detected is alcohol. In other embodiments, the component to be detected may be other gases or liquids, etc., and this embodiment does not specifically limit this.

[0041] Figure 4 A cross-sectional view of the electronic nose device with a second impeller 45 provided in this embodiment is shown. Figure 4 and combined Figure 1 and Figure 2As shown, in another embodiment, the power assembly 4 includes a rotation source 41 disposed on the central axis of the air inlet channel 11, a first impeller 42 disposed on the rotation source 41 and located in the air inlet channel 11, and a second impeller 45 fixedly disposed on the first impeller 42 and located in the air outlet channel 12. The first impeller 42 can introduce the gas to be tested into the air inlet channel 11 when it is rotated by the rotation source 41, and the second impeller 45 can introduce air into the air outlet channel 12 when it is rotated by the first impeller 42. The blades of the second impeller 45 and the blades of the first impeller 42 are forward-curved blades and backward-curved blades, respectively. The rotation source 41 generates power to rotate, simultaneously driving the first impeller 42 and the second impeller 45 mounted thereon to rotate as well. Since the first impeller 42 has backward-curved blades and is located within the air inlet channel 11, it can draw the gas to be tested from the inlet of the air inlet channel 11 into the air inlet channel 11 and discharge it from the air inlet channel 11 under the drive of the rotation source 41. The second impeller 45 has forward-curved blades and is located within the air outlet channel 12, so it can draw air from outside the housing 1 into the air outlet channel 12 and discharge it into the air curtain 3 under the drive of the rotation source 41, causing air to form an air curtain in front of the air outlet 3111 of the air curtain 3. Thus, the first impeller 42 and the second impeller 45 can rotate simultaneously under the drive of the same rotation source 41, and each can perform the functions of drawing in and discharging the gas to be tested.

[0042] The configuration of the first impeller 42 driven by the rotation source 41 and the air multiplier 43 provided in this embodiment not only enables the power component 4 to draw in the gas to be tested but also to exhaust air. Furthermore, since the rotation source 41 and the first impeller 42 are respectively located within the air inlet channel 11, and the air multiplier 43 is connected to the air outlet channel 12, the possibility of interference between the gas to be tested in the air outlet channel 12 and the gas to be tested in the air inlet channel 11 can be effectively avoided. This effectively reduces the error in the qualitative and quantitative detection of the gas components in the air inlet channel 11 by the detection component 2. Another embodiment provides a configuration of the rotation source 41, the first impeller 42, and the second impeller 45, which also enables the power component 4 to draw in the gas to be tested and to exhaust air. In this configuration, since both the first impeller 42 and the second impeller 45 are located on the rotation source 41, they achieve both drawing in and exhausting the gas to be tested through the same rotation source 41, resulting in a simpler structure and easier maintenance and repair. In practical applications, the two settings mentioned above can be changed according to different actual needs to better meet different practical requirements.

[0043] Figure 5 A schematic diagram of the structure of the rotation source 41, the first impeller 42, and the housing 1 provided in this embodiment is shown. Figure 4 and combined Figures 1-3As shown, the rotation source 41 includes a motor 411 fixedly installed in the air inlet channel 11, and a fan head 412 connected to the motor 411 for powering the first impeller 42 or for connecting the first impeller 42 and the second impeller 45. The power assembly 4 also includes a support frame 44 connected to the motor 411 and the housing 1 respectively. The motor 411 drives the fan head 412 to rotate, thereby driving the first impeller 42 or the first impeller 42 and the second impeller 45 to generate power, thereby drawing in the gas to be tested or expelling air. For example, the motor 411 can be a split-type brushless external rotor motor 411, which utilizes its low noise and long lifespan to ensure the quietness and stability of the power assembly 4 during operation, thereby improving the user experience.

[0044] Continue to refer to Figures 1-3 As shown, the air inlet channel 11 includes an inlet section 111 for accommodating the rotating source 41 and the first impeller 42, and a detection section 112 connected to and located downstream of the inlet section 111. The electronic nose device also includes a breathable and dirt-blocking membrane 5 disposed between the inlet section 111 and the detection section 112. The electronic nose device also includes a partition cylinder 6 fixedly disposed in the air inlet channel 11 and dividing the detection section 112 into a first sub-segment 1121 and a second sub-segment 1122. The breathable and dirt-blocking membrane 5 covers the inlet of the partition cylinder 6. The detection component 2 is disposed in the first sub-segment 1121, and the second sub-segment 1122 surrounds the first sub-segment 1121 and is not covered by the breathable and dirt-blocking membrane 5. When the gas to be tested is drawn into the air inlet channel 11, it is first introduced through the inlet section 111 with the rotation source 41, then through the detection section 112 with the detection component 2, and finally discharged from the air inlet channel 11. The breathable and dirt-blocking membrane 5 located between the inlet section 111 and the detection section 112 allows the gas to be tested to pass through the membrane and filter out some impurities in the gas, so as to prevent impurities (such as dust or particulate matter) in the gas to interfere with the normal operation of the detection component 2 and cause errors in the detection results. This ensures that the detection component 2 works in a cleaner environment, thereby improving the accuracy of the detection results of the detection component 2. Furthermore, since the detection section 112 is further divided into the first sub-section 1121 and the second sub-section 1122 by the partition cylinder 6, impurities (such as dust or particulate matter) blocked by the breathable and dirt-blocking membrane 5 can be discharged from the air inlet channel 11 through the second sub-section 1122 under the action of the power component 4 in the inlet section 111, so as to avoid the accumulation of impurities in the detection section 112 and further ensure the accuracy of the detection results of the detection component 2.

[0045] Specifically, the breathable and dirt-proof membrane 5 is a porous film made of polytetrafluoroethylene. It utilizes the property of porous membranes to filter some dust particles, thereby achieving purification and breathability. As a result, the breathable and dirt-proof membrane 5 can effectively filter out impurities in the gas to be tested.

[0046] Furthermore, the electronic nose device also includes a baffle 7 fixedly disposed within the partition cylinder 6 and used to form the first segment 1121 into a meandering channel, providing a longer flow distance for the gas to be tested within the first segment 1121. The meandering channel can also accommodate more sets of detection components 2, thereby improving the accuracy of the electronic nose device in detecting the gas to be tested. Exemplarily, the baffle 7 can be a cylindrical helical blade to facilitate the formation of the first segment 1121 into a meandering channel, and the cylindrical helical blade is easier to install.

[0047] Furthermore, the electronic nose device also includes a semiconductor cooler 9 and an electric heater 10 located at the bottom of the wall of the partition cylinder 6. The semiconductor cooler 9 can keep the liquid in the gas to be tested always in a liquid state when the electronic nose device is in working state, so as to avoid the liquid interfering with the detection structure of the detection component 2. The electric heater 10 can heat the liquid in the partition cylinder 6 when the electronic nose device is not in working state, so that the liquid can turn into gas for easy flowout.

[0048] Furthermore, the air curtain 3 includes a cylindrical or conical outer cover 31, an inner cover 32 that is cylindrical or conical and located inside the outer cover 31, an inner channel 321 formed within the inner cover 32, and an outer channel 311 forming between the outer cover 31 and the inner cover 32. The inner channel 321 has an air inlet 3211 and is connected to the air inlet channel 11, and the outer channel 311 has an air outlet 3111 and is connected to the air outlet channel 12. This makes the air curtain discharged in front of the air outlet 3111 of the air curtain 3 a hollow cylinder or a hollow cone, so as to achieve the purpose of enveloping the gas to be measured. The inner cover 32 and the outer cover 31 can also form a partition by themselves, thereby improving the enveloping effect of the air curtain.

[0049] Furthermore, the detection component 2 includes a semiconductor gas sensor, an electrochemical gas sensor, a microstructure gas sensor, and a surface acoustic wave gas sensor to detect the composition and content of the target component in the gas to be tested within the first sub-segment 1121. The detection component 2 also includes a gas-liquid sensor, a temperature sensor, and a humidity sensor to detect the liquid composition and content of the target gas within the first sub-segment 1121. The electronic nose device also includes a logic control unit electrically connected to the detection component 2 to control the various sensors within the detection component 2.

[0050] Specifically, the logic control unit includes a processor (such as a PLC or CPU), a memory, and electronic components connected to the processor, in order to control the various sensors of the detection component 2. The processor, memory, and electronic components are all prior art well known to those skilled in the art, and therefore will not be described in detail here.

[0051] Furthermore, the electronic nose device also includes a purification component 8 arranged within the air inlet channel 11 and the air outlet channel 12. The purification component 8 includes activated carbon 81, an ultraviolet lamp 82, and a photocatalytic coating 83. The activated carbon 81 can adsorb harmful gases in the air, such as volatile organic compounds like formaldehyde, benzene, and xylene, as well as odorous gases like ammonia and sulfur dioxide, effectively improving air quality and reducing the potential harm of harmful gases to human health. The ultraviolet light in the ultraviolet lamp 82 has a strong bactericidal effect, capable of destroying the cell walls of bacteria, thus exerting a bactericidal effect. The photocatalytic coating 83 can decompose viruses in the air. When light shines on the surface of the photocatalytic coating 83, harmful substances are decomposed into harmless water and carbon dioxide, thereby playing an antibacterial and air-purifying role.

[0052] 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 invention based on the specific circumstances.

[0053] Based on the above description of this application, those skilled in the art will also understand that the terms used, such as "upper," "lower," "front," "rear," "inner," and "outer," 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 should not be understood or interpreted as a limitation on the present invention.

[0054] 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.

[0055] While numerous embodiments of the 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 essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of protection of the invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An electronic nose device, characterized in that, include: A housing, comprising an air inlet channel and an air outlet channel disposed therein, the air outlet channel being disposed circumferentially around the air inlet channel; A detection component is arranged in the air inlet channel of the housing and performs qualitative and quantitative detection on the components to be detected in the gas to be tested passing through the air inlet channel. An air curtain is disposed on the housing and includes an air inlet communicating with the inlet of the air inlet channel and an air outlet surrounding the air inlet and communicating with the outlet of the air outlet channel. A power assembly, one part of which is arranged in the air outlet channel of the housing, is used to introduce air from outside the housing into the air outlet channel and discharge it from the air outlet of the air curtain to form a hollow cylinder or hollow cone air curtain in front of the air outlet of the air curtain; and another part of the power assembly is arranged in the air inlet channel of the housing, for introducing the gas to be tested, which is in front of the air outlet of the air curtain and is wrapped by the air curtain, into the air inlet channel. The power assembly includes a rotating source located on the central axis of the air inlet channel, a first impeller located on the rotating source and within the air inlet channel, and a second impeller fixed on the first impeller and within the air outlet channel. The first impeller can introduce the gas to be tested into the air inlet channel when rotated by the rotating source, and the second impeller can introduce the air into the air outlet channel when rotated by the first impeller. The blades of the second impeller and the first impeller are, respectively, forward-curved blades and backward-curved blades. The air inlet channel includes an inlet section for accommodating the rotating source and the first impeller, and a detection section connected to and downstream of the inlet section. The electronic nose device also includes a breathable and dirt-blocking membrane disposed between the inlet section and the detection section. The electronic nose device also includes a partition cylinder fixedly disposed in the air inlet channel and dividing the detection section into a first sub-segment and a second sub-segment. The breathable and dirt-blocking membrane covers the inlet of the partition cylinder. The detection component is disposed in the first sub-segment, and the second sub-segment surrounds the first sub-segment and is not covered by the breathable and dirt-blocking membrane. The housing also includes an air intake channel located at the outlet of the air outlet channel. The power assembly includes a rotating source located in the air intake channel, a first impeller located on the rotating source and in the air intake channel, and an air multiplier located on the housing. The first impeller can introduce the gas to be tested into the air intake channel when it is rotated by the rotating source. The injection port of the air multiplier is located in the air intake channel or the air curtain and sprays the traction airflow toward the air outlet, so that the traction airflow draws the air in the air outlet channel before leaving the air outlet and forms an air curtain after leaving the air outlet. The blades of the first impeller are backward-curved blades.

2. The electronic nose device according to claim 1, characterized in that, The breathable and dirt-resistant membrane is a porous film made of polytetrafluoroethylene.

3. The electronic nose device according to claim 2, characterized in that, The electronic nose device also includes a baffle fixed inside the partition cylinder and used to form the first sub-segment into a meandering channel.

4. The electronic nose device according to claim 3, characterized in that, The electronic nose device includes a semiconductor cooler and an electric heater located at the bottom of the partition cylinder.

5. The electronic nose device according to claim 1, characterized in that, The air curtain includes a cylindrical or conical outer cover, an inner cover disposed within the outer cover and also cylindrical or conical, an inner channel formed within the inner cover, and an outer channel forming between the outer cover and the inner cover, wherein the inner channel has the air inlet and is connected to the air inlet channel, and the outer channel has the air outlet and is connected to the air outlet channel.

6. The electronic nose device according to claim 1, characterized in that, The detection components include semiconductor gas sensors, electrochemical gas sensors, microstructure gas sensors and / or surface acoustic wave gas sensors, as well as gas-liquid sensors, temperature sensors and / or humidity sensors. The electronic nose device also includes a logic control unit electrically connected to the detection components.

7. The electronic nose device according to claim 1, characterized in that, The electronic nose device also includes a purification component disposed in the air inlet channel and / or air outlet channel, wherein the purification component includes activated carbon, ultraviolet lamp and / or photocatalytic coating.

Images