Particulate matter concentration detection module and smoke machine

Abstract

This utility model discloses a particulate matter concentration detection module and a smoke hood. The particulate matter concentration detection module includes: a housing, comprising a main body and a cover, the main body having an air duct, and the cover covering the main body; a detection unit disposed within the main body, the detection unit having a detection area communicating with the air duct, the detection area being open on the side facing the cover; and a sealing member, at least disposed between the side of the detection area facing the cover and the cover, to seal the gap between the side of the detection area facing the cover and the cover. Therefore, by setting this particulate matter concentration detection module, the sealing between the detection unit and the cover can be improved, thereby preventing dust accumulation inside the detection area and improving the authenticity and accuracy of the 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 particles in the fluid pass 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 particulate matter in the fluid.

[0003] In related technologies, particulate matter concentration detection devices include a housing and a detection unit. The detection unit is assembled inside the housing, and the detection unit forms a detection area at the intersection of airflow and laser. However, in the production workshop, the detection unit, processed by molds, has gaps after assembly with the housing, resulting in poor sealing between the two. This allows dust to easily enter the detection area through the gaps, forming dust accumulation and causing the detection data to spike. Utility Model Content

[0004] This invention aims to solve at least 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 improves the sealing between the detection unit and the cover, thereby preventing dust accumulation inside the detection area and improving the authenticity and accuracy of the detection results.

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

[0006] According to a first aspect of the present invention, a particulate matter concentration detection module includes: a housing, the housing comprising a main body and a cover, the main body having an air duct portion, and the cover covering the main body; a detection unit disposed within the main body, the detection unit having a detection area communicating with the air duct portion, the detection area being open on the side facing the cover; and a sealing member, the sealing member being at least disposed between the side of the detection area facing the cover and the cover to seal the gap between the side of the detection area facing the cover and the cover.

[0007] Therefore, by setting up this particulate matter concentration detection module, the sealing between the detection unit and the cover can be improved, thereby preventing dust accumulation inside the detection area and improving the authenticity and accuracy of the detection results.

[0008] In some examples of this utility model, the sealing element is an elastic sealing element.

[0009] In some examples of this utility model, the elastic seal is one of a rubber seal and a polyurethane seal.

[0010] In some examples of this utility model, the sealing element is constructed as a sealing diaphragm, the sealing element is disposed on the side surface of the cover facing the main body and the detection unit, and the sealing element at least covers the detection area.

[0011] In some examples of this utility model, the air duct is open on the side facing the cover, and the seal covers at least the air duct and the detection area; and / or the seal is bonded to the surface of the cover facing the main body and the detection unit by adhesive.

[0012] In some examples of this utility model, the particulate matter concentration detection module further includes: an elastic element, which abuts against the body and the cover along the thickness direction of the shell; wherein the sealing element has an avoidance hole, and the elastic element passes through the avoidance hole.

[0013] In some examples of this utility model, the sealing element is constructed as a sealing strip, which is disposed on the side surface of the cover facing the main body and the detection unit, and the sealing strip corresponds to the side edge of the detection area facing the cover.

[0014] In some examples of this utility model, the thickness of the seal is t, where t satisfies the relationship: 0.15mm≤t≤0.25mm; and / or the seal is a black seal.

[0015] In some examples of this invention, the depth of at least a portion of the air duct increases in the direction approaching the detection area; and / or the width of at least a portion of the air duct decreases in the direction approaching the detection area.

[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 label:

[0029] 100. Particulate matter concentration detection module; 200. Smoke hood; 201. Ventilation outlet;

[0030] 10. Shell; 11. Main body; 111. Air duct section; 112. First through hole; 113. Second through hole; 114. Third through hole; 12. Cover; 121. Upper cover; 122. Lower cover; 13. Air inlet; 14. Air inlet duct; 141. Inlet; 142. Outlet; 15. Reflector; 16. Exhaust duct; 17. Air outlet; 18. Settlement tank; 19. Vent hole;

[0031] 20. Detection unit; 21. Detection area; 211. Detection entrance; 212. Detection exit; 22. Reflection area; 221. Light-transmitting hole; 222. Light-blocking rib; 223. Light-blocking plate; 224. Extension plate; 2241. Extinction structure; 225. Opening; 23. Perforation; 24. Filter hole; 25. Beam channel; 26. Detection bracket;

[0032] 30. Seal; 31. Clearance hole; 40. Detection element; 41. Light emitter; 50. Fan; 60. Circuit board. Detailed Implementation

[0033] 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.

[0034] The following is for reference. Figures 1-9 The particulate matter concentration detection module 100 according to an embodiment of the present invention can improve the sealing between the detection unit 20 and the cover 12, thereby preventing dust accumulation inside the detection area 21 and improving the authenticity and accuracy of the detection results.

[0035] Combination Figures 1-9 As shown, the particulate matter concentration detection module 100 according to the first aspect embodiment of the present invention includes a housing 10, a detection unit 20, and a sealing member 30. 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 further includes a detection element 40 and a detection bracket 26. The detection element 40 is mounted on the detection bracket 26, which serves as a stable support structure, providing a stable working position for the detection element 40, thereby ensuring the accuracy and reliability of the detection results.

[0036] Specifically, the housing 10 includes a main body 11 and a cover 12. The main body 11 is provided with an air duct 111. The cover 12 covers the main body 11. The detection unit 20 is disposed inside the main body 11. The detection unit 20 is provided with a detection area 21. The detection area 21 is connected to the air duct 111. The side of the detection area 21 facing the cover 12 is open. The sealing member 30 is at least disposed between the side of the detection area 21 facing the cover 12 and the cover 12 to seal the gap between the side of the detection area 21 facing the cover 12 and the cover 12.

[0037] Specifically, along the thickness direction of the housing 10, the cover 12 is placed on one or both sides of the main body 11. The air duct 111 can be used to provide a guide channel for the airflow entering the housing 10. The air duct 111 is also connected to the detection area 21, so that the airflow can flow along the air duct 111 to the detection area 21, which is beneficial for the detection of particulate matter concentration in the airflow.

[0038] Furthermore, since the detection area 21 is open on the side facing the cover 12, and at least a portion of the sealing element 30 is disposed along the thickness direction of the housing 10 between the detection area 21 facing the cover 12 and the cover 12, the assembly gap between the detection unit 20 and the cover 12 can be effectively sealed, thereby preventing dust from entering the detection area 21 through the gap between the detection unit 20 and the cover 12 and causing excessive dust accumulation, thus improving the authenticity and accuracy of multiple detection results during repeated use.

[0039] Therefore, by setting up the particulate matter concentration detection module 100, the sealing between the detection unit 20 and the cover 12 can be improved, thereby preventing dust accumulation inside the detection area 21 and improving the authenticity and accuracy of the detection results.

[0040] According to some optional embodiments of the present invention, the seal 30 is an elastic seal.

[0041] In particular, since the elastic seal has the ability to deform elastically, it can be adapted to different gap distances between the detection unit 20 and the cover 12, thereby improving the applicability of the elastic seal; and since the elastic seal has good elastic recovery ability, it can maintain the sealing effect even when there is a small displacement or vibration between the detection unit 20 and the cover 12, thereby improving the dynamic adaptability of the sealing effect.

[0042] In addition, the elastic seal has a simple structure and is quick and easy to install, which can effectively reduce assembly time and production costs.

[0043] Specifically, the resilient seal is one of rubber seals and polyurethane seals.

[0044] For example, resilient seals are made of rubber. Rubber materials have good elasticity and resilience, allowing them to adapt to minor displacements or vibrations between components and maintain a long-term effective seal. Furthermore, rubber materials can provide a reliable seal at a lower cost, thus balancing the practicality and economy of the seal 30. Rubber seals have a wider range of material choices, such as nitrile rubber, fluororubber, silicone rubber, and EPDM rubber, among others.

[0045] For example, the elastic seal is a polyurethane seal. Polyurethane material has high wear resistance, which effectively extends the service life of the seal 30. Moreover, the polyurethane material can still recover its original shape well after long-term compression, thereby reducing the risk of seal failure caused by permanent deformation and improving the reliability of the seal 30.

[0046] According to some optional embodiments of the present invention, the sealing element 30 is constructed as a sealing diaphragm, and the sealing element 30 is disposed on the side surface of the cover 12 facing the main body 11 and the detection unit 20, and the sealing element 30 at least covers the detection area 21.

[0047] As arranged as described above, the seal 30 is constructed as a sheet-like sealing diaphragm, which increases the coverage area of ​​the seal 30. Furthermore, along the thickness direction of the housing 10, the seal 30 is disposed on the side surface of the cover 12 facing the main body 11 and the detection unit 20. This ensures that the seal 30 covers the detection area 21 while also increasing the sealing coverage area between the cover 12 and the main body 11. This reduces the risk that dust may enter the air duct 111 from the assembly gap between the cover 12 and the main body 11 and then deposit in the detection area 21, further improving the authenticity and accuracy of the detection results.

[0048] Alternatively, the air duct 111 is open on the side facing the cover 12, and the seal 30 at least covers the air duct 111 and the detection area 21.

[0049] Since the air duct 111 is connected to the detection area 21 and the air duct 111 is open on the side facing the cover 12, the sealing member 30 seals the open air duct 111 on the basis of covering the detection area 21. This can prevent the open side of the air duct 111 from forming a gap with the cover 12 in the thickness direction of the housing 10, thereby preventing dust from falling into the detection area 21 connected to the air duct 111 through the gap between the air duct 111 and the cover 12, thus ensuring the authenticity and accuracy of the test results and preventing the problem of dust accumulation and overflow.

[0050] Alternatively, the seal 30 is bonded to the surface of the cover 12 facing the body 11 and the detection unit 20 by adhesive.

[0051] In this way, the sealing element 30 is directly connected to the cover body 12 as a whole by means of adhesive. Compared with other connection methods, adhesive connection can reduce the number of parts and assembly steps, improve production efficiency, and simplify the assembly process. Moreover, adhesive can help the sealing element 30 to distribute the stress it is subjected to evenly, avoiding the risk of damage caused by local stress concentration.

[0052] Specifically, in combination Figure 2 , Figure 4and Figure 6 As shown, the particulate matter concentration detection module 100 also includes an elastic element, which abuts against the body 11 and the cover 12 along the thickness direction of the housing 10; wherein, the sealing element 30 has a clearance hole 31, and the elastic element passes through the clearance hole 31. For example, the elastic element can be a spring.

[0053] It is understandable that the main body 11 is provided with a through hole along the thickness direction of the shell 10, and the sealing element 30 is provided with a relief hole 31 corresponding to the through hole. The relief hole 31 allows the inner surface of the lower cover 122 to be exposed. An elastic element is installed in the through hole. The end of the elastic element near the cover 12 can pass through the relief hole 31 and abut against the cover 12, thereby avoiding the risk of structural interference between the sealing element 30 and the elastic element and improving the rationality of the arrangement.

[0054] According to some optional embodiments of the present invention, the sealing element 30 is constructed as a sealing strip, which is disposed on the side surface of the cover 12 facing the main body 11 and the detection unit 20, and the sealing strip corresponds to the side edge of the detection area 21 facing the cover 12.

[0055] The sealing strip is usually modified into a long strip shape, and the length can be customized according to the needs. This makes it easy to install the sealing strip along the gap path between the edge of the detection area 21 facing the cover 12 and the cover 12, thereby achieving a gap sealing effect between the detection area 21 and the cover 12, preventing dust from entering the interior of the detection area 21 through the gap, and thus improving the authenticity and accuracy of the detection results.

[0056] According to some optional embodiments of this utility model, the thickness of the sealing element 30 is t, where t satisfies the relationship: 0.15mm ≤ t ≤ 0.25mm. For example, the thickness of the sealing element 30 can be 0.15mm, 0.18mm, 0.20mm, and 0.25mm, and is not limited thereto.

[0057] Specifically, the thickness direction of the seal 30 is... Figure 4 The thickness of the seal 30 is shown in the vertical direction. When the thickness of the seal 30 is less than 0.15mm, the thickness is too small, which may lead to insufficient thickness of the seal 30 itself and inability to effectively seal the gap. When the thickness of the seal 30 is greater than 0.25mm, the thickness is too large, which may cause excessive extrusion pressure on the seal 30 and lead to premature failure. Moreover, the excessive thickness of the seal 30 may also cause problems with improper assembly of the main body 11 and the cover 12. In summary, by controlling the thickness of the seal 30 within a suitable range, the sealing effect of the seal 30 between the detection unit 20 and the cover 12 can be effectively guaranteed without excessive material consumption.

[0058] Alternatively, the seal 30 may be a black seal.

[0059] In particular, since the black seal (black can absorb almost all wavelengths of visible light) can absorb the light entering its surface to the maximum extent, it can effectively reduce the interference of reflected light and stray light inside the housing 10 during particulate matter concentration detection (such as the reflected light generated by the dust accumulation in the non-detection area 21 after being irradiated by the detection laser may be reflected to the detection area 21 through the housing 10), reduce background noise, and thus help the detection element 40 to capture the target signal more accurately and enhance the data accuracy of the detection results.

[0060] According to some optional embodiments of the present invention, the depth of at least a portion of the air duct portion 111 increases in the direction approaching the detection area 21. The depth direction of the air duct portion 111 is... Figure 4 The up and down directions are shown in the diagram.

[0061] As shown above, the cross-sectional area of ​​the air duct 111 gradually increases along the direction perpendicular to the airflow. When the airflow flows along the air duct 111, according to Bernoulli's principle, the airflow velocity slows down as the cross-sectional area of ​​the air duct 111 gradually increases. This reduces turbulence and friction, making the airflow more stable and thus closer to the airflow velocity in the real environment, thereby improving the data accuracy of real-time detection results.

[0062] Alternatively, combined Figure 6 and Figure 7 As shown, the width of at least a portion of the air duct section 111 decreases in the direction close to the detection area 21.

[0063] The above arrangement allows the air duct section 111 to have a larger capture coverage area at the end near the air inlet 13, thereby increasing the air intake volume of the air duct section 111 at the same time. On the other hand, it also helps to gradually reduce the cross-sectional area of ​​the air duct section 111 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.

[0064] Specifically, in combination Figures 2-4 , Figures 6-9 As shown, the cover 12 includes an upper cover 121 and a lower cover 122. Along the thickness direction of the shell 10, the upper cover 121 and the lower cover 122 are respectively covered on both sides of the main body 11. The upper cover 121 is provided with an air inlet 13 and an air outlet 17. The air duct 111 forms an air inlet duct 14. The two ends of the air inlet duct 14 are formed with an inlet 141 and an outlet 142. The inlet 141 is connected to the air inlet 13. The detection area 21 is provided with a detection inlet 211. The detection inlet 211 is opposite to the outlet 142 and is connected to the outlet 142.

[0065] The airflow outside the housing 10 can enter the housing 10 through the air inlet 13. The airflow inside the housing 10 can flow along the air inlet duct 14 in a designated path. The inlet 141 of the air inlet duct 14 is connected to the air inlet 13, and the outlet 142 of the air inlet duct 14 is connected to the detection inlet 211 of the detection area 21. In other words, the airflow can flow along the flow path of air inlet 13-air inlet duct 14-detection area 21 in sequence, thereby successfully guiding the outside air to the detection area 21, which is beneficial for the detection of particulate matter concentration in the air.

[0066] Furthermore, by placing both the air inlet 13 and the air outlet 17 on the upper cover 121, 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 121 where the air inlet 13 and the air outlet 17 are not obstructed, without exposing the main body 11 and the lower cover 122, thereby simplifying the installation method of the particulate matter concentration detection module 100.

[0067] Specifically, in combination Figures 6-8 As shown, the cross-section of the detection inlet 211 is perpendicular to the airflow direction through the outlet 142, and the cross-section of the outlet 142 is perpendicular to the airflow direction through the outlet 142. The airflow entering the housing 10 can flow along the air inlet duct 14 in a designated path. The outlet 142 of the air inlet duct 14 is connected to the detection inlet 211 of the detection area 21. That is, the airflow can flow sequentially along the flow path of the air inlet duct 14-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.

[0068] Furthermore, along the airflow direction, the cross-sectional area of ​​the outlet 142 of the air inlet duct 14 is the same as the cross-sectional area of ​​the detection area 21. This avoids the detection inlet 211 from blocking the outlet 142 of the air inlet duct 14, thereby reducing the change in airflow velocity caused by structural obstruction, improving the smoothness of the airflow from the outlet 142 to the detection inlet 211, and allowing the airflow to maintain its original velocity as it flows through the intersection of the detection area 21 and the air inlet duct 14. This allows the airflow at the intersection to be updated more quickly, thereby increasing the update frequency of the particulate matter detection results and improving the real-time detection effect of the particulate matter concentration detection module 100.

[0069] 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.

[0070] Furthermore, combining Figure 2 , Figures 4-7 As shown, the particulate matter concentration detection module 100 also includes a circuit board 60 and a fan 50. Both the circuit board 60 and the fan 50 are disposed inside the housing 10. The circuit board 60 can be electrically connected to the detection element 40 and the fan 50 respectively, which facilitates the timely and accurate transmission of action commands from the circuit board 60 to the detection element 40 and the fan 50. The fan 50 is mainly used to blow airflow from outside the housing 10 into the housing 10 and make the airflow flow along a specified path.

[0071] The circuit board 60 is disposed between the main body 11 and the lower cover 122. Along the thickness direction of the housing 10, the gap between the side of the circuit board 60 away from the air inlet duct 14 and the housing 10 forms an exhaust duct 16 (after the circuit board 60 is installed in the housing 10). Along the width direction of the detection bracket 26, the air inlet duct 14 is located on one side of the detection bracket 26, and a groove 18 is provided on the other side of the detection bracket 26. The part of the circuit board 60 corresponding to the groove 18 is provided with an air vent 19. The airflow in the air inlet duct 14 flows through the detection area 21 and then enters the groove 18, and then enters the exhaust duct 16 through the air vent 19.

[0072] In other words, the air vent 19 can indirectly connect the air intake duct 14 and the air exhaust duct 16. That is, the airflow flowing from the air inlet 13 into the air intake duct 14 flows through the detection area 21 and then flows into the air exhaust duct 16 through the air vent 19 at the settling groove 18. The settling groove 18 can ensure that the airflow has a certain buffer space before flowing into the air vent 19, preventing the airflow from becoming turbulent at the air vent 19.

[0073] In addition, combined Figures 7-9 As shown, the detection area 21 is also provided with a detection outlet 212, which is opposite to the detection inlet 211. The detection outlet 212 and the detection inlet 211 are connected, and the detection outlet 212 is connected to the settling tank 18.

[0074] Furthermore, the circuit board 60 has a clearance notch opposite to the air inlet 13, the fan 50 is installed at the clearance notch, the air inlet side of the fan 50 is connected to the air inlet 13, and the air outlet side of the fan 50 is connected to the inlet 141 of the air inlet duct 14.

[0075] It is understandable that when the fan 50 is working, it can blow external airflow from the air inlet 13 to the air inlet duct 14, and the airflow in the air inlet duct 14 then flows to the detection area 21 and the exhaust duct 16 in sequence, and finally flows out from the air outlet 17.

[0076] Optionally, combined Figure 4 and Figure 6 As shown, the main body 11 is provided with a first through hole 112, a second through hole 113 and a third through hole 114. The sealing member 30 is provided with a relief hole 31 corresponding to the first through hole 112, the second through hole 113 and the third through hole 114. The relief hole 31 allows the inner surface of the lower cover 122 to be exposed. The circuit board 60 is provided with a copper leakage area corresponding to the first through hole 112 and the third through hole 114. Elastic members are installed in the first through hole 112, the second through hole 113 and the third through hole 114. The two ends of the elastic members in the first through hole 112 and the third through hole 114 respectively abut against the copper leakage area and the lower cover 122. The two ends of the elastic members in the second through hole 113 abut against the inner surface of the upper cover 121 and the inner surface of the lower cover 122 respectively.

[0077] In the first through hole 112 and the third through hole 114, one end of the elastic element passes through the seal 30 and abuts against the lower cover 122, and the other end abuts against the exposed copper area of ​​the circuit board 60, thereby enabling the lower cover 122 to conduct electricity with the circuit board 60. In the second through hole 113, one end of the elastic element passes through the seal 30 and abuts against the lower cover 122, and the other end abuts against the upper cover 121, thereby enabling the lower cover 122 to conduct electricity with the upper cover 121.

[0078] Furthermore, the particulate matter concentration detection module 100 is installed with its lower cover 122 in contact with the installation environment, meaning the lower cover 122 is grounded. The copper leakage area of ​​the circuit board 60 and the upper cover 121 are both connected to the lower cover 122, allowing both to be grounded through it. This means that static electricity in the copper leakage area and the upper cover 121 can be discharged to the installation environment via the lower cover 122, thus grounding the entire housing 10. This prevents the housing 10 from becoming charged, thus avoiding the attraction of surrounding dust and reducing the probability of attracted dust entering the detection area 21 and affecting the detection results. Additionally, the grounded housing 10 is not charged, preventing electrical charge from affecting the signal transmission and reception of signal devices on the circuit board 60, thereby providing signal interference immunity.

[0079] Specifically, in combination Figure 6 , Figure 7 and Figure 9As shown, the detection element 40 includes a light emitter 41 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 41 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 41 from the particles in the detection area 21.

[0080] In this device, the emitting end of the light emitter 41 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 14 and the beam channel 25. The detection area 21 is provided with a perforation 23. The light receiver is disposed on the circuit board 60 and aligned with the perforation 23. The perforation 23 provides an optical channel for the scattered light from the particulate matter in the airflow within the detection area 21 to be smoothly received by the light receiver.

[0081] The light emitter 41 can emit a laser beam along the beam channel 25. Since the beam channel 25 intersects with the detection area 21, the 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 passing 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 60. The electrical signal on the circuit board 60 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 particles in the airflow based on the processed detection signal.

[0082] 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 spaced apart, 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.

[0083] 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 41. This can filter out excess light beams that are not preset in wavelength, intensity, or divergence, and only retain 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, so that the intensity, wavelength or incident angle of the light beam entering the detection area 21 is more uniform, and the scattered light received by the light receiver is also more uniform, so that the detection result of particulate matter concentration in the airflow calculated from the scattered light is more accurate and reliable.

[0084] Specifically, in combination Figures 6-9As 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.

[0085] 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 by the light beam emitted by the light emitter 41 after passing through the detection area 21 and illuminating 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).

[0086] Furthermore, 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.

[0087] 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.

[0088] 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.

[0089] 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 41 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 41; the light-extinguishing structure 2241 on the extension plate 224 helps to dissipate the intensity of the 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.

[0090] For example, when the light beam emitted by the light emitter 41 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.

[0091] Furthermore, 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, and a reflector 15 is provided in the housing 10. The reflector 15 is provided at the opening 225 to reflect the light that shines on the reflector 15 through the light-transmitting hole 221 to the light-extinguishing structure 2241.

[0092] In other words, the reflector 15 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 15 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 15 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.

[0093] Specifically, in combination Figures 6-9As 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.

[0094] 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.

[0095] Furthermore, combined Figure 8 and Figure 9 As shown, the angle between the reflector 15 and the light-blocking plate 223 is α, which satisfies the relationship: α < 90°. The angle between the reflector 15 and the extension plate 224 is β, which satisfies the relationship: β < 90°.

[0096] As arranged as described above, the light-blocking plate 223, reflector 15, and extension plate 224 form a triangular-like light trap structure (i.e., reflection area 22). Since the angles between the reflector 15 and the light-blocking plate 223 are acute, and the angles between the reflector 15 and the extension plate 224 are also acute, the light beam entering the light trap structure will first strike the reflector 15. Most of the light from the reflector 15 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.

[0097] 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 the detection results, thereby enhancing the market competitiveness of the smoke hood 200.

[0098] Among them, combined Figure 1 and Figure 2As shown, the smoke hood 200 is provided with a vent 201, which is connected to the air inlet 13 and air outlet 17 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 13 and air outlet 17 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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, include: The housing (10) includes a main body (11) and a cover (12). The main body (11) is provided with an air duct (111), and the cover (12) covers the main body (11). The detection unit (20) is disposed inside the main body (11). The detection unit (20) is provided with a detection area (21). The detection area (21) is connected to the air duct (111). The detection area (21) is open on the side facing the cover (12). A sealing element (30) is provided at least between the side of the detection area (21) facing the cover (12) and the cover (12) to seal the gap between the side of the detection area (21) facing the cover (12) and the cover (12).

2. The particulate matter concentration detection module (100) according to claim 1, characterized in that, The sealing element (30) is an elastic sealing element.

3. The particulate matter concentration detection module (100) according to claim 2, characterized in that, The elastic seal is one of a rubber seal and a polyurethane seal.

4. The particulate matter concentration detection module (100) according to claim 1, characterized in that, The sealing element (30) is constructed as a sealing diaphragm. The sealing element (30) is disposed on one side surface of the cover (12) facing the main body (11) and the detection unit (20). The sealing element (30) at least covers the detection area (21).

5. The particulate matter concentration detection module (100) according to claim 4, characterized in that, The air duct (111) is open on the side facing the cover (12), and the seal (30) at least covers the air duct (111) and the detection area (21); and / or The seal (30) is bonded to the side surface of the cover (12) facing the main body (11) and the detection unit (20) by adhesive.

6. The particulate matter concentration detection module (100) according to claim 4, characterized in that, Also includes: An elastic element, along the thickness direction of the housing (10), abuts between the main body (11) and the cover (12); The sealing element (30) has a clearance hole (31), and the elastic element passes through the clearance hole (31).

7. The particulate matter concentration detection module (100) according to claim 1, characterized in that, The sealing element (30) is constructed as a sealing strip, which is disposed on the side surface of the cover (12) facing the main body (11) and the detection unit (20), and the sealing strip corresponds to the side edge of the detection area (21) facing the cover (12).

8. The particulate matter concentration detection module (100) according to claim 1, characterized in that, The thickness of the seal (30) is t, where t satisfies the relationship: 0.15mm ≤ t ≤ 0.25mm; and / or The seal (30) is a black seal (30).

9. The particulate matter concentration detection module (100) according to claim 1, characterized in that, At least a portion of the depth of the air duct section (111) increases in the direction approaching the detection area (21); and / or The width of at least a portion of the air duct section (111) decreases in the direction of approaching the detection area (21).

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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