Particulate matter concentration detection module and range hood

Abstract

The utility model discloses a kind of particulate matter concentration detection module and range hood, the particulate matter concentration detection module is formed with air inlet air duct and the detection area for particulate matter concentration detection, the outlet of the air inlet air duct is opposite with the detection inlet of the detection area and is communicated, in airflow direction, the detection area is configured as equal cross section area, the cross-sectional area of the outlet of the air inlet air duct is same with the cross-sectional area of the detection area. Therefore, by setting the particulate matter concentration detection module, the fluency of airflow when flowing through detection area can be improved, and the problem of dust deposition in the detection area caused by the traditional baffle shielding can also be avoided, thereby improving the authenticity and accuracy of real-time detection results.

Description

Technical Field

[0001] This utility model relates to the field of smoke machine technology, and in particular to a particulate matter concentration detection module and a smoke machine. Background Technology

[0002] A particulate matter concentration detection device is a device that uses the Mie scattering theory to count or measure the mass concentration of suspended particles in the air. A typical particulate matter concentration detection device includes a fluid flow channel, a laser emitting component for generating laser light, and a laser detection component for sensing the scattered light. The fluid being measured flows in the fluid flow channel. When dust particles in the fluid flow over the laser detection component, they are irradiated by the laser emitted by the laser emitting component, generating scattered light. The laser detection component receives this scattered light and analyzes it to determine the concentration of dust particles in the fluid.

[0003] In related technologies, the particulate matter concentration detection device of the smoke machine forms a detection area at the intersection of airflow and laser. The detection area is surrounded by a number of flow-blocking structures. When the airflow passes through the detection area, the flow rate is slowed down due to the obstruction of the flow-blocking structures, resulting in slower airflow renewal in the detection area. Moreover, dust is easily affected by the obstruction of the flow-blocking structures and accumulates in the detection area, making it impossible to reflect the true particulate matter concentration in real time. Utility Model Content

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a particulate matter concentration detection module that can improve the smoothness of airflow through the detection area and avoid the problem of dust accumulation in the detection area caused by traditional baffles, thereby improving the authenticity and accuracy of real-time detection results.

[0005] This utility model further proposes a smoke hood.

[0006] According to the particulate matter concentration detection module of the first aspect of the present invention, the particulate matter concentration detection module has an air inlet duct and a detection area for detecting particulate matter concentration. The outlet of the air inlet duct is opposite to and connected to the detection inlet of the detection area. In the airflow direction, the detection area is constructed as a region with a constant cross-section, and the cross-sectional area of ​​the outlet of the air inlet duct is the same as the cross-sectional area of ​​the detection area.

[0007] Therefore, by setting up this particulate matter concentration detection module, the smoothness of airflow when passing through the detection area can be improved, and the problem of dust accumulation in the detection area caused by traditional baffles can be avoided, thereby improving the authenticity and accuracy of real-time detection results.

[0008] In some examples of this utility model, the particulate matter concentration detection module includes: a housing having an air inlet duct; and a detection unit disposed within the housing having a detection area.

[0009] In some examples of this utility model, the particulate matter concentration detection module includes: a housing, the housing having the air inlet duct and the detection area; and a detection unit disposed within the housing, the detection unit having an avoidance area, and the detection area being disposed within the avoidance area.

[0010] In some examples of this utility model, the detection unit is further provided with a reflective area for light extinction. The reflective area is adjacent to the detection area. The reflective area has a light-transmitting hole that communicates with the detection area. A light-blocking horizontal rib is formed at the bottom of the light-transmitting hole.

[0011] In some examples of this utility model, the reflective area includes: a light-blocking plate, which is constructed as a sidewall of one side of the detection area, and the light-blocking plate is provided with the light-transmitting hole and the light-blocking horizontal rib; an extension plate, which is connected to the light-blocking plate, and the extension plate is bent relative to the light-blocking plate, and the extension plate is provided with an anti-light structure.

[0012] In some examples of this utility model, an opening is formed between the ends of the light-blocking plate and the extension plate that are far apart from each other, and the housing is provided with a reflector, which is disposed at the opening to reflect light that shines on the reflector through the light-transmitting hole to the extinction structure.

[0013] In some examples of this invention, the matting structure includes a plurality of sequentially arranged serrated portions.

[0014] In some examples of this utility model, the angle between the reflector and the light-blocking plate is α, where α satisfies the relationship: α < 90°, and the angle between the reflector and the extension plate is β, where β satisfies the relationship: β < 90°.

[0015] In some examples of this invention, the cross-sectional area of ​​at least a portion of the air inlet duct decreases in the airflow direction.

[0016] The smoke hood according to the second aspect of this utility model includes: the particulate matter concentration detection module described above.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a structural schematic diagram of a range hood according to an embodiment of the present utility model;

[0020] Figure 2 This is a structural schematic diagram of the particulate matter concentration detection module according to an embodiment of the present utility model from a first angle;

[0021] Figure 3 This is a structural schematic diagram of the particulate matter concentration detection module according to an embodiment of the present utility model from a second angle;

[0022] Figure 4 This is an exploded view of the particulate matter concentration detection module according to an embodiment of the present invention;

[0023] Figure 5 This is a partial structural schematic diagram of the particulate matter concentration detection module according to an embodiment of the present utility model;

[0024] Figure 6 This is a schematic diagram of another part of the particulate matter concentration detection module according to an embodiment of the present utility model;

[0025] Figure 7 This is a partial structural diagram of the particulate matter concentration detection module according to an embodiment of the present utility model;

[0026] Figure 8 yes Figure 7 Enlarged view of region A in the middle;

[0027] Figure 9 This is a schematic diagram of the detection unit according to an embodiment of the present utility model;

[0028] Figure 10 This is a partial structural schematic diagram of a detection unit according to another embodiment of the present invention.

[0029] Figure label:

[0030] 100. Particulate matter concentration detection module; 200. Smoke hood; 201. Ventilation outlet;

[0031] 10. Shell; 10a. Main body; 10b. Top cover; 10c. Bottom cover; 11. Air inlet; 12. Air inlet duct; 121. Inlet; 122. Outlet; 13. Reflector; 14. Exhaust duct; 15. Air outlet; 16. Settlement tank; 17. Vent hole;

[0032] 20. Detection unit; 21. Detection area; 211. Detection entrance; 2111. First transition arc segment; 212. Detection exit; 2121. Second transition arc segment; 22. Reflection area; 221. Light-transmitting hole; 222. Light-blocking rib; 223. Light-blocking plate; 224. Extension plate; 2241. Extinction structure; 225. Opening; 23. Clearance hole; 24. Filter hole; 25. Beam channel; 26. Detection bracket;

[0033] 30. Detection element; 31. Light emitter;

[0034] 40. Fan; 50. Circuit board; 60. Sealing film. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0036] The following is for reference. Figures 1-10 The particulate matter concentration detection module 100 according to an embodiment of the present invention can improve the smoothness of airflow when flowing through the detection area 21, and can also avoid the problem of dust deposition in the detection area 21 caused by the obstruction of traditional baffles, thereby improving the authenticity and accuracy of real-time detection results.

[0037] Combination Figures 1-10 As shown, the particulate matter concentration detection module 100 has an air inlet duct 12 and a detection area 21 for particulate matter concentration detection. The outlet 122 of the air inlet duct 12 is opposite to the detection inlet 211 of the detection area 21, and the outlet 122 of the air inlet duct 12 is connected to the detection inlet 211 of the detection area 21. In the airflow direction, the detection area 21 is constructed as a region with a constant cross-section, and the cross-sectional area of ​​the outlet 122 of the air inlet duct 12 is the same as the cross-sectional area of ​​the detection area 21.

[0038] Specifically, the cross-section of the detection inlet 211 is perpendicular to the airflow direction through the outlet 122, and the cross-section of the outlet 122 is perpendicular to the airflow direction through the outlet 122. The airflow entering the particulate matter concentration detection module 100 can flow along the air inlet duct 12 in a designated path. The outlet 122 of the air inlet duct 12 is connected to the detection inlet 211 of the detection area 21, meaning that the airflow can flow sequentially along the flow path of the air inlet duct 12 to the detection area 21, thereby successfully guiding the air to the detection area 21, which is beneficial for detecting the concentration of particulate matter in the air.

[0039] Furthermore, along the airflow direction, the cross-sectional area of ​​the outlet 122 of the air inlet duct 12 is the same as the cross-sectional area of ​​the detection area 21. This avoids the detection inlet 211 from blocking the outlet 122 of the air inlet duct 12, thereby reducing the change in airflow velocity caused by structural obstruction, improving the smoothness of the airflow from the outlet 122 to the detection inlet 211, and allowing the airflow to maintain its original velocity through the intersection of the detection area 21 and the air inlet duct 12. This allows the airflow at the intersection to be updated more quickly, thereby increasing the update frequency of particulate matter detection results and improving the real-time detection effect of the particulate matter concentration detection module 100.

[0040] Moreover, compared to the traditional structure of placing a baffle at the detection outlet (with openings on the baffle, through which airflow from the air inlet duct enters the detection area), the embodiment in this case can reduce the problem of dust accumulation in the detection area 21 caused by the baffle obstruction (that is, dust from the previous measurement process was not carried away by the airflow in time due to the baffle obstruction, causing dust accumulation and affecting the accuracy of subsequent detection), thereby effectively improving the authenticity and accuracy of the detection results.

[0041] Specifically, the detection area 21 is constructed as a region with a uniform cross-section. The detection area 21 also includes a detection outlet 212, which is opposite to and connected to the detection inlet 211. That is, along the airflow direction within the detection area 21, the cross-section of the detection area 21 from the detection inlet 211 to the detection outlet 212 (i.e., the cross-section perpendicular to the airflow direction through the detection area 21) is uniform. This simplifies design and improves manufacturing efficiency, while also avoiding uneven gas flow velocity caused by variations in the cross-section of the detection area 21, thereby improving the accuracy of the detection results.

[0042] In addition, the housing 10 of the particulate matter concentration detection module 100 is also provided with an air inlet 11, and an inlet 121 is formed at one end of the air inlet duct 12. The air inlet 11 and the inlet 121 are connected. The airflow outside the housing 10 can enter the interior of the housing 10 through the air inlet 11, and the airflow inside the housing 10 can flow along the air inlet duct 12 to the detection area 21.

[0043] Therefore, by setting up the particulate matter concentration detection module 100, the smoothness of the airflow when passing through the detection area 21 can be improved, and the problem of dust accumulation in the detection area 21 caused by the obstruction of traditional baffles can be avoided, thereby improving the authenticity and accuracy of the real-time detection results.

[0044] Specifically, the particulate matter concentration detection module 100 includes a housing 10 and a detection unit 20. The housing 10 serves as the main load-bearing structural component of the external contour of the particulate matter concentration detection module 100, protecting the internal structures. The detection unit 20 also includes a detection element 30 and a detection bracket 26. The detection element 30 is mounted on the detection bracket 26, which acts as a stable support structure, providing a stable working position for the detection element 30 and ensuring the accuracy and reliability of the detection results.

[0045] Alternatively, the housing 10 has an air inlet duct 12, and the detection unit 20 is disposed inside the housing 10, with the detection unit 20 having a detection area 21. As arranged above, the detection area 21 on the detection unit 20 is interconnected with the air inlet duct 12 on the housing 10, which facilitates the smooth flow of external air through the air inlet duct 12 to the detection area 21, thereby enabling the detection of particulate matter concentration.

[0046] Alternatively, the housing 10 has an air inlet duct 12 and a detection area 21. The detection unit 20 is disposed within the housing 10, and the detection unit 20 has a clearance area, within which the detection area 21 is disposed. With this arrangement, the housing 10 has interconnected air inlet ducts 12 and detection areas 21, and the clearance area of ​​the detection unit 20 can avoid the detection area 21, preventing structural interference between the detection unit 20 and the housing 10. This also helps reduce manufacturing process difficulty and improve structural reliability.

[0047] Alternatively, combined Figures 6-8 As shown, the width of the detection inlet 211 is equal to the width of the outlet 122. Since the detection inlet 211 and the outlet 122 correspond to each other, the width direction of the detection inlet 211 is consistent with the width direction of the outlet 122. This arrangement can avoid the detection inlet 211 from forming a structural obstruction to the outlet 122 in its own width direction, thereby ensuring the continuity and smoothness of the airflow from the air inlet duct 12 to the detection area 21, reducing the probability of dust deposition in the detection area 21, and thus effectively improving the authenticity and accuracy of the detection results in the repeated use process.

[0048] Alternatively, combine Figures 6-8As shown, the height of the detection inlet 211 is equal to the height of the outlet 122. Since the detection inlet 211 and the outlet 122 correspond to each other, the height direction of the detection inlet 211 is consistent with the height direction of the outlet 122. This arrangement can avoid the detection inlet 211 from forming a structural obstruction to the outlet 122 in its own height direction, thereby ensuring the continuity and smoothness of the airflow from the air inlet duct 12 to the detection area 21, reducing the probability of dust deposition in the detection area 21, and thus effectively improving the authenticity and accuracy of the detection results in the repeated use process.

[0049] Specifically, in combination Figure 10 As shown, along the airflow direction through the detection area 21, a first transition arc segment 2111 is provided at one end of the detection area 21 near the detection inlet 211, and a second transition arc segment 2121 is provided at one end of the detection area 21 near the detection outlet 212.

[0050] As arranged as above, the first transition arc segment 2121 can smoothly guide the airflow at the outlet 122 into the detection area 21, avoiding obstruction of the airflow at the outlet 122, reducing turbulence and noise, thereby improving the rationality of the design; the second transition arc segment 2121 can smoothly guide the airflow at the detection outlet 212 to outside the detection area 21, avoiding obstruction of the airflow at the detection outlet 212, reducing turbulence and noise, thereby improving practicality and the rationality of the design.

[0051] According to some optional embodiments of the present invention, combined with Figures 6-9 As shown, the detection unit 20 is also provided with a reflective area 22 for light extinction. The reflective area 22 is adjacent to the detection area 21. The reflective area 22 has a light-transmitting hole 221 that communicates with the detection area 21. A light-blocking horizontal rib 222 is formed at the bottom of the light-transmitting hole 221. Specifically, the detection bracket 26 of the detection unit 20 may be provided with a reflective area 22.

[0052] Specifically, along the direction of light transmission, the reflective area 22 is located downstream of the detection area 21. The reflective area 22 is provided with a light-transmitting hole 221, allowing the light beam passing through the detection area 21 to enter the interior of the reflective area 22 after passing through the light-transmitting hole 221. The reflective area 22 is mainly used to reduce the reflected light generated after the light beam emitted by the light emitter 31 passes through the detection area 21 and irradiates the side wall of the housing 10, which then re-enters the detection area 21 (thus generating new scattered light that is received by the light receiver and affects the detection result).

[0053] The reflective area 22 is arranged adjacent to the detection area 21, and the light-transmitting hole 221 on the reflective area 22 is connected to the detection area 21. Light in the detection area 21 can enter the reflective area 22 through the light-transmitting hole 221. The reflective area 22 can reduce the intensity of the incident light and ultimately achieve the extinction effect by reflecting the incident light multiple times.

[0054] Furthermore, along the height direction of the detection unit 20, a light-blocking rib 222 is formed at the bottom of the light-transmitting hole 221. Compared to a traditional light-transmitting notch, the light-blocking rib 222 can increase the light-blocking area of ​​the reflection area 22 on the detection area 21 side, thereby reducing the probability of light that has entered the reflection area 22 being mistakenly reflected back to the detection area 21, avoiding the generation of new scattered light that is received by the light receiver and affects the detection results, thus improving the authenticity and accuracy of the detection results. Specifically, the detection bracket 26 of the detection unit 20 can form the light-blocking rib 222 at the bottom of the light-transmitting hole 221.

[0055] Specifically, in combination Figures 7-9 As shown, the reflective area 22 includes a light-blocking plate 223 and an extension plate 224. The light-blocking plate 223 is constructed as a sidewall of one side of the detection area 21. The light-blocking plate 223 is provided with a light-transmitting hole 221 and a light-blocking horizontal rib 222. The extension plate 224 is connected to the light-blocking plate 223 and is bent relative to the light-blocking plate 223. The extension plate 224 is provided with an extinction structure 2241.

[0056] Furthermore, the detection element 30 includes a light emitter 31 and a light receiver, which are disposed at different positions on the detection bracket 26. The detection bracket 26 is also provided with a beam channel 25, which is located on one side of the detection area 21. The light emitted by the light emitter 31 can propagate along the beam channel 25, which passes through the detection area 21. The light receiver can be disposed on the wall of the detection area 21 and can be used to receive the light scattered by the light emitted by the light emitter 31 from the particles in the detection area 21.

[0057] Furthermore, the light-blocking plate 223 is mainly used to block the scattered light from particles in the detection area 21, and the light-transmitting hole 221 is used to provide an incident channel for the light emitted by the light emitter 31 that is not scattered by the particles to enter the reflection area 22, which helps to eliminate the strong light emitted by the light emitter 31; the light-extinguishing structure 2241 on the extension plate 224 helps to dissipate the intensity of incident light in the reflection area 22, thereby ensuring that only the effective scattered light from the particles enters the light receiver, thereby enhancing the sensitivity and accuracy of the measurement.

[0058] For example, when the light beam emitted by the light emitter 31 enters the interior of the reflective area 22 through the light transmission hole 221 along the beam channel 25, it will irradiate the side wall of the reflective area 22 and produce multiple reflections. The light reflected again in the reflective area 22 will be blocked by the light blocking plate 223 and will be difficult to return to the detection area 21, thereby avoiding the generation of new scattered light that will be received by the light receiver and affect the detection results.

[0059] Furthermore, combining Figure 6 , Figure 7 and Figure 9 As shown, the emitting end of the light emitter 31 faces the entrance of the beam channel 25. The detection area 21 on the detection unit 20 forms the intersection of the air inlet duct 12 and the beam channel 25. An avoidance hole 23 is provided on the bottom surface of the detection area 21. The light receiver is disposed on the circuit board 50 and aligned with the avoidance hole 23.

[0060] Alternatively, combined Figure 9 As shown, the detection bracket 26 is also provided with two or more filter structures located on the optical transmission path. The two or more filter structures are arranged at intervals, and each filter structure is provided with a filter hole 24. On the optical transmission path, the detection area 21 is located downstream of the filter structure.

[0061] Two or more filter structures are spaced apart along the optical transmission line. The filter structures can perform two or more levels of filtering on the light beam emitted by the light emitter 31, thereby filtering out excess light beams that are not preset in wavelength, intensity, or divergence, and only retaining the preset center light beam through the filter aperture 24. After two or more levels of filtering, the light beam can finally enter the detection area 21 located downstream of the filter structure, thereby making the intensity, wavelength, or incident angle of the light beam entering the detection area 21 more uniform, and thus making the scattered light received by the light receiver more uniform, so that the detection result of the particulate matter concentration in the measured fluid calculated from the scattered light is more accurate and reliable.

[0062] Furthermore, combining Figures 7-9 As shown, an opening 225 is formed between the ends of the light-blocking plate 223 and the extension plate 224 that are far apart from each other. The housing 10 is provided with a reflector 13, which is located at the opening 225 to reflect the light that shines on the reflector 13 through the light-transmitting hole 221 to the light-extinguishing structure 2241.

[0063] In other words, the reflector 13 on the housing 10 is positioned at the opening 225 formed by the light-blocking plate 223 and the extension plate 224. Compared to the traditional detection unit structure that has an oblique reflective surface between the light-blocking plate and the extension plate, the embodiment in this case can replace the original oblique reflective surface by eliminating it and designing a reflector 13 on the housing 10. This increases the distance between the reflective surface and the light-extinguishing structure 2241 on the extension plate 224, making it more difficult for the light reflected by the reflector 13 to shine back into the light-transmitting hole 221 and enter the detection area 21. This further reduces the interference of interfering light on the detection results and improves the accuracy of the detection results.

[0064] Specifically, in combination Figures 6-9 As shown, the extinction structure 2241 includes multiple sequentially arranged serrated sections. Since light is easily reflected when it hits a smooth surface, these reflected lights, if they enter the detector, will interfere with the actual measurement signal. Because the serrated sections have a more irregular surface and a larger surface area, they can disperse and guide the incident light within the reflection area 22 in different directions, rather than concentrating it in one direction and reflecting it back. In this way, the serrated sections can effectively reduce the reflected light that directly returns to the detection area 21, making it easier for the incident light to be absorbed after multiple reflections rather than continuing to propagate. This helps the reflection area 22 to more thoroughly absorb stray light, enhancing the internal extinction effect of the particulate matter concentration detection module 100, canceling out more reflected light, further reducing interference from light on the detection results, and enhancing the accuracy and reliability of the detection results.

[0065] In addition, the sequentially arranged serrated sections can help to evenly distribute the incident light within the reflection zone 22, so that it can be treated similarly at different angles, avoiding strong reflection at certain specific angles.

[0066] Furthermore, combined Figure 8 and Figure 9 As shown, the angle between the reflector 13 and the light-blocking plate 223 is α, which satisfies the relationship: α < 90°. The angle between the reflector 13 and the extension plate 224 is β, which satisfies the relationship: β < 90°.

[0067] As arranged as described above, the light-blocking plate 223, reflector 13, and extension plate 224 form a triangular-like light trap structure (i.e., reflection area 22). Since the angles between the reflector 13 and the light-blocking plate 223 are acute, and the angles between the reflector 13 and the extension plate 224 are also acute, the light beam entering the light trap structure will first strike the reflector 13. Most of the light on the reflector 13 is then reflected onto the extinction structure 2241 of the extension plate 224. The extinction structure 2241 can reflect the reflected light generated on itself again. Through multiple reflections, most of the reflected light can be canceled out. Very little reflected light re-enters the detection area 21 through the light-transmitting hole 221, thus reducing interference from light on the detection results and improving their accuracy.

[0068] According to some optional embodiments of the present invention, combined with Figure 6 and Figure 7 As shown, in the airflow direction, the cross-sectional area of ​​at least part of the air inlet duct 12 decreases.

[0069] The above arrangement allows for a larger capture coverage area at the end of the air inlet duct 12 near the air inlet 13, thereby increasing the air volume of the air inlet duct 12 at the same time. On the other hand, it also helps to gradually reduce the cross-sectional area of ​​the air inlet duct 12 in the direction near the detection area 21, thereby increasing the concentration and flow speed of the airflow, which in turn helps to improve the efficiency of the detection work.

[0070] Alternatively, combined Figure 4 , Figure 6 and Figure 7 As shown, the particulate matter concentration detection module 100 also includes a circuit board 50 and a fan 40. Both the circuit board 50 and the fan 40 are disposed inside the housing 10. The circuit board 50 can be electrically connected to the detection element 30 and the fan 40 respectively, which facilitates the timely and accurate transmission of action commands from the circuit board 50 to the detection element 30 and the fan 40. The fan 40 is located between the air inlet 11 and the inlet 121 of the air inlet duct 12. The fan 40 is mainly used to blow the airflow outside the housing 10 into the housing 10 and make the airflow flow along a specified path.

[0071] Specifically, after the circuit board 50 is installed inside the housing 10, an exhaust duct 14 is formed between the side of the circuit board 50 away from the air inlet duct 12 and the housing 10 along the thickness direction of the housing 10; along the width direction of the detection bracket 26, the air inlet duct 12 is located on one side of the detection bracket 26, and a groove 16 is provided on the other side of the detection bracket 26. The part of the circuit board 50 corresponding to the groove 16 is provided with an air vent 17. The airflow in the air inlet duct 12 flows through the detection area 21 and then enters the groove 16, and then enters the exhaust duct 14 through the air vent 17.

[0072] In summary, the air passage 17 can indirectly connect the air inlet duct 12 and the air outlet duct 14. That is, the airflow flowing from the air inlet 11 into the air inlet duct 12 flows through the detection area 21 and then flows into the air outlet duct 14 through the air passage 17 at the settling groove 16. The settling groove 16 can ensure that the airflow has a certain buffer space before flowing into the air passage 17, preventing the airflow from becoming turbulent at the air passage 17.

[0073] Furthermore, combined Figures 2-6 As shown, the housing 10 is also provided with an air outlet 15, which allows the airflow in the exhaust duct 14 to flow out to the outside of the housing 10.

[0074] Furthermore, the housing 10 includes a main body 10a, an upper cover 10b, and a lower cover 10c. Along the thickness direction of the housing 10, the upper cover 10b and the lower cover 10c are respectively disposed on both sides of the main body 10a, and the circuit board 50 is disposed between the main body 10a and the lower cover 10c.

[0075] The upper cover 10b is provided with an air inlet 11 and an air outlet 15. The circuit board 50 has a clearance notch opposite to the air inlet 11. The fan 40 is installed at the clearance notch. The air inlet side of the fan 40 is connected to the air inlet 11, and the air outlet side of the fan 40 is connected to the inlet 121 of the air inlet duct 12.

[0076] It is understandable that when the fan 40 is working, it can blow external airflow from the air inlet 11 to the air inlet duct 12, and the airflow in the air inlet duct 12 then flows to the detection area 21 and the exhaust duct 14 in sequence, and finally flows out from the air outlet 15.

[0077] Furthermore, by placing both the air inlet 11 and the air outlet 15 on the upper cover 10b, when installing the particulate matter concentration detection module 100 on the application equipment, it is only necessary to ensure that the portions of the upper cover 10b with the air inlet 11 and the air outlet 15 are not obstructed, without exposing the main body 10a and the lower cover 10c, thereby simplifying the installation of the particulate matter concentration detection module 100.

[0078] Furthermore, combined Figure 4 and Figure 6 As shown, a sealing film 60 is provided on the side of the lower cover 10c near the main body 10a. The sealing film 60 can undergo elastic deformation, that is, it is squeezed and filled between the main body 10a and the lower cover 10c. This can improve the sealing between the lower cover 10c and the main body 10a, preventing dust around the lower cover 10c from entering the air inlet duct 12 through the gap between the lower cover 10c and the main body 10a. This avoids dust entering the intersection of the air inlet duct 12 and the beam channel 25 (i.e., the detection area 21) and affecting the detection results of the particulate matter concentration detection module 100, thereby improving the detection accuracy of the particulate matter concentration detection module 100.

[0079] The detection principle of the particulate matter concentration detection module 100 is described below:

[0080] Combination Figure 6 , Figure 7 and Figure 9 As shown, the light emitter 31 can emit a laser beam along the beam channel 25. Since the beam channel 25 intersects with the detection area 21, the laser beam will enter the detection area 21 along the beam channel 25. The beam entering the detection area 21 will generate scattered light when it irradiates the particles in the airflow being measured through the detection area 21. Part of the scattered light is received by the light receiver installed on the detection area 21. The light receiver then converts the received scattered light into an electrical signal on the circuit board 50. The electrical signal on the circuit board 50 is then amplified by the adjustment circuit and after noise reduction processing, the detection result is sent to the processing unit. The processing unit calculates the concentration of particulate matter in the fluid being measured based on the processed detection signal.

[0081] According to a second aspect embodiment of the present invention, the smoke hood 200 includes the particulate matter concentration detection module 100 of the above embodiment. Thus, the smoke hood 200 with the particulate matter concentration detection module 100 can improve the authenticity and accuracy of real-time detection results, thereby enhancing the market competitiveness of the smoke hood 200.

[0082] The smoke hood 200 is equipped with a ventilation opening 201, which is connected to the air inlet 11 and air outlet 15 of the particulate matter concentration detection module 100. In this way, it is only necessary to keep the parts of the housing 10 with the air inlet 11 and air outlet 15 unobstructed, without exposing the rest of the housing 10. This reduces the risk of external dust entering the particulate matter concentration detection module 100 from other parts of the housing 10, thereby improving its anti-interference ability and detection accuracy.

[0083] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0084] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0086] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A particulate matter concentration detection module (100), characterized in that, The particulate matter concentration detection module (100) has an air inlet duct (12) and a detection area (21) for particulate matter concentration detection. The outlet (122) of the air inlet duct (12) is opposite to and connected to the detection inlet (211) of the detection area (21). In the airflow direction, the detection area (21) is constructed as a region with a constant cross-section. The cross-sectional area of ​​the outlet (122) of the air inlet duct (12) is the same as the cross-sectional area of ​​the detection area (21).

2. The particulate matter concentration detection module (100) according to claim 1, characterized in that, include: Housing (10), wherein the housing (10) has the air inlet duct (12); The detection unit (20) is disposed inside the housing (10) and the detection unit (20) forms the detection area (21).

3. The particulate matter concentration detection module (100) according to claim 1, characterized in that, The particulate matter concentration detection module (100) includes: The housing (10) has the air inlet duct (12) and the detection area (21) formed thereon. The detection unit (20) is disposed within the housing (10), and the detection unit (20) has a clearance area, and the detection area (21) is disposed within the clearance area.

4. The particulate matter concentration detection module (100) according to claim 2 or 3, characterized in that, The detection unit (20) is also provided with a reflective area (22) for light extinction. The reflective area (22) is adjacent to the detection area (21). The reflective area (22) has a light-transmitting hole (221) that communicates with the detection area (21). A light-blocking horizontal rib (222) is formed at the bottom of the light-transmitting hole (221).

5. The particulate matter concentration detection module (100) according to claim 4, characterized in that, The reflective zone (22) includes: A light-blocking plate (223) is constructed as a sidewall of one side of the detection area (21). The light-blocking plate (223) is provided with the light-transmitting hole (221) and the light-blocking horizontal rib (222). An extension plate (224) is connected to the light-blocking plate (223). The extension plate (224) is bent relative to the light-blocking plate (223). The extension plate (224) is provided with an extinction structure (2241).

6. The particulate matter concentration detection module (100) according to claim 5, characterized in that, An opening (225) is formed between the ends of the light-blocking plate (223) and the extension plate (224) that are far apart from each other. The housing (10) is provided with a reflector (13), which is located at the opening (225) to reflect light that shines on the reflector (13) through the light-transmitting hole (221) to the extinction structure (2241).

7. The particulate matter concentration detection module (100) according to claim 5, characterized in that, The extinction structure (2241) includes a plurality of sequentially arranged serrated sections.

8. The particulate matter concentration detection module (100) according to claim 6, characterized in that, The angle between the reflector (13) and the light-blocking plate (223) is α, and α satisfies the relationship: α < 90°. The angle between the reflector (13) and the extension plate (224) is β, and β satisfies the relationship: β < 90°.

9. The particulate matter concentration detection module (100) according to claim 1, characterized in that, In the direction of airflow, the cross-sectional area of ​​at least part of the air inlet duct (12) decreases.

10. A range hood (200), characterized in that, include: The particulate matter concentration detection module (100) according to any one of claims 1-9.

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