Particulate matter concentration detection device

Abstract

The utility model relates to the technical field of detection devices, and discloses a particulate matter concentration detection device, which comprises a shell, an air inlet, an air outlet, an air inlet and an air outlet, a flow channel communicated with the air inlet and the air outlet is arranged in the shell; a detection cavity is formed in the flow channel; a detection element mounting cavity is formed in one side of the detection cavity; the detection element comprises a light emitter and a light receiver, the light emitter is arranged in the detection element mounting cavity and used for emitting light rays into the detection cavity, and the light receiver is arranged in the detection cavity and used for receiving the light rays scattered by the particulate matter; at least one reflection part is arranged in the detection element installation cavity, and light emitted by the light emitter is reflected into the detection cavity through the reflection part. According to the particulate matter concentration detection device, the reflection part is arranged in the detection element mounting cavity, the light path of the light emitter is changed, and the risk of oil stain deposition on the surface of the light emitter is reduced, so that the accuracy of a detection result is improved, and meanwhile, the service life is prolonged.

Description

Technical Field

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

[0002] With the increasing popularity of smart homes, the intelligent upgrading of kitchen appliances is receiving growing attention. As a core piece of kitchen equipment, the improvement of the range hood's intelligence level is crucial for improving the kitchen environment and user health. However, traditional range hoods mostly rely on manual or preset program control, making it difficult to dynamically adjust according to actual air quality, easily leading to poor smoke extraction and energy waste. Therefore, developing intelligent range hoods that can automatically adjust their smoke extraction mode based on kitchen air quality is particularly important.

[0003] Existing technologies attempt to monitor air quality in real time using particulate matter concentration detection devices to precisely control smoking patterns. These devices measure the concentration of particulate matter in the air using optical sensors based on the principle of light scattering. When light passes through air containing particulate matter, the particles scatter the light, and the optical sensor calculates the particulate matter concentration by detecting the intensity of the scattered light.

[0004] However, because kitchen fumes contain a large number of grease particles, and the light-emitting window of the light emitter in the optical sensor is quite sensitive, direct contact between fumes, water vapor, or particulate matter and the light emitter can easily cause deviations in the intensity and angle of light emission, thus affecting the accuracy of the detection results. Existing detection devices lack effective oil-proofing measures, making it difficult to maintain stable detection performance over a long period. Utility Model Content

[0005] Addressing the technical problem in existing detection devices where oil accumulation easily covers the detection elements, leading to decreased detection accuracy and shortened service life, this invention provides a particulate matter concentration detection device. By installing a reflective component inside the detection element mounting cavity, the optical path of the light emitter is altered, reducing the risk of oil deposition on the surface of the light emitter, thereby improving the accuracy of the detection results and extending its service life.

[0006] This utility model provides a particulate matter concentration detection device, comprising:

[0007] The housing has an air inlet and an air outlet; the housing has a flow channel connecting the air inlet and the air outlet; the flow channel has a detection chamber; and a detection element mounting cavity is provided on one side of the detection chamber.

[0008] The detection element includes a light emitter and a light receiver. The light emitter is disposed inside the mounting cavity of the detection element and is used to emit light into the detection cavity. The light receiver is disposed inside the detection cavity and is used to receive light scattered by particulate matter.

[0009] The detection element mounting cavity is provided with at least one reflective component, and the light emitted by the light emitter is reflected into the detection cavity through the reflective component.

[0010] In some embodiments, at least one oil-blocking baffle is provided between the light emitter and the detection cavity, and the oil-blocking baffle has small holes for light to pass through.

[0011] In some embodiments, an extinction trap cavity is provided on the other side of the detection cavity to absorb or deflect light passing through the detection cavity and prevent it from being reflected back into the detection cavity.

[0012] In some embodiments, an airflow blocking structure is provided in the flow channel, and the airflow blocking structure is located upstream of the detection cavity along the airflow direction.

[0013] In some embodiments, the airflow obstruction structure includes a plurality of columnar structures, which are arranged alternately within the flow channel.

[0014] In some embodiments, the airflow blocking structure further includes an open baffle with a plurality of openings, and the multiple open baffles are arranged sequentially in the flow channel along the airflow direction, with the openings on adjacent open baffles being staggered.

[0015] In some embodiments, the perforated baffle is inclined relative to the airflow direction.

[0016] In some embodiments, the airflow blocking structure includes a plurality of staggered baffles arranged in an alternating manner, the plurality of staggered baffles forming an S-shaped meandering flow channel.

[0017] In some embodiments, the staggered baffles are arranged at an angle relative to the airflow direction.

[0018] In some embodiments, the airflow obstruction structure is a labyrinth flow channel structure, which forms a tortuous path.

[0019] Compared with the prior art, the advantages and positive effects of this utility model are:

[0020] The aforementioned particulate matter concentration detection device isolates the light emitter from the oil fume airflow by setting a detection element mounting cavity on one side of the detection chamber, thus preventing the light emitter from being directly exposed to the oil fume airflow. At the same time, by setting a reflective component in the detection element mounting cavity, the optical path of the light emitter is changed, reducing the risk of oil stains deposited on the surface of the light emitter, thereby improving the accuracy of the detection results and reducing the performance degradation of the light emitter caused by contamination, thus extending its service life. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the internal structure of the particulate matter concentration detection device in Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the flow of oil fume airflow in Embodiment 2 of this utility model, where the airflow blocking structure is an open baffle.

[0024] Figure 3 for Figure 2 Lateral cross-sectional view;

[0025] Figure 4 for Figure 2 A schematic diagram of the perforated baffle structure in the middle;

[0026] Figure 5 In Embodiment 3 of this utility model, a schematic diagram of the flow of oil fume airflow with an airflow blocking structure consisting of staggered baffles is provided.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100 - Housing; 111 - Air inlet; 112 - Air outlet; 133 - Oil baffle;

[0029] 300 - Detection element; 310 - Light emitter; 320 - Light receiver;

[0030] 500 - Airflow blocking structure; 510 - Columnar structure; 520 - Perforated baffle; 530 - Staggered baffle;

[0031] 600 - Reflective component;

[0032] Flow channel F; air inlet section f1; detection section f2; air outlet section f3; detection chamber C.

[0033] Detection element mounting cavity D; Extinction trap cavity E; Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] Reference Figures 1-5 These are some embodiments of the particulate matter concentration detection device of this utility model. Example 1

[0039] like Figure 1 As shown, the particulate matter concentration detection device includes a housing 100, a detection element 300 disposed in the housing, a circuit board, and a fan (not shown).

[0040] The housing 100 has an internal cavity, and the housing 100 is provided with an air inlet 111 and an air outlet 112, which are used to guide airflow through the internal cavity.

[0041] The detection element 300 is used to detect the concentration of particulate matter in the airflow entering the device.

[0042] A flow channel F is provided inside the housing, which connects the air inlet 111 and the air outlet 112, guiding the airflow to enter from the air inlet 111, and after being detected by the detection element 300, to be discharged through the air outlet 112 (e.g., Figure 1 The arrow indicates the direction of the oil fume airflow.

[0043] The fan is located inside the flow channel F and is used to drive the airflow within the flow channel F.

[0044] The circuit board is used to control the operating status of the detection element 300 and the fan.

[0045] In this embodiment, the flow channel F has a detection cavity C, and a detection element mounting cavity D is provided on one side of the detection cavity C.

[0046] Specifically, the detection element 300 is an optical sensor, including a light emitter 310 and a light receiver 320.

[0047] Optical sensors measure the concentration of particulate matter in the air based on the principle of light scattering. When light passes through air containing particulate matter, the particulate matter scatters the light, and the optical sensor calculates the concentration of particulate matter by detecting the intensity of the scattered light.

[0048] A light emitter 310 is disposed within the detection element mounting cavity D and is used to emit light into the detection cavity C. The light emitter 310 emits light to irradiate particulate matter in the air. The light emitter 310 can be an infrared light-emitting diode (IR LED) or a laser diode. A laser light source is preferred because it has higher accuracy and stability, and can meet the requirements of high-precision measurement.

[0049] The light emitted by the light emitter 310 enters the detection cavity C through the through hole opened on the flow channel F.

[0050] A light receiver 320 is disposed within the detection cavity C and is used to receive light scattered by particulate matter. The light receiver 320 is typically a photoelectric conversion device such as a photodiode or phototransistor, which can convert the received light signal into an electrical signal, and then process it through circuitry to obtain particulate matter concentration information.

[0051] Because the light-emitting window of the light emitter 310 is quite sensitive, if oil fumes, water vapor or particulate matter come into direct contact with the light emitter 310, it can easily cause deviations in the intensity and angle of light emission, thereby affecting the accuracy of the detection results.

[0052] To prevent oil fumes, water vapor, etc., from affecting the light emitter 310 and its detection accuracy, in this embodiment, such as Figure 1 As shown, at least one reflective component 600 is provided inside the detection element mounting cavity D. The light emitted by the light emitter 310 is reflected into the detection cavity by the reflective component 600. The reflective component 600 can change the optical path of the light emitter, changing direct light to reflected light, so that the light emitter can be moved away from the detection cavity. This reduces the risk of oil and dirt deposition on the surface of the light emitter, thereby improving the accuracy of the detection results. At the same time, it reduces the performance degradation of the light emitter caused by contamination and extends its service life.

[0053] The aforementioned particulate matter concentration detection device isolates the light emitter 310 from the oil fume flow by setting a detection element mounting cavity D on one side of the detection cavity C, thus preventing the light emitter 310 from being directly exposed to the oil fume flow. At the same time, by setting a reflective component 600 in the detection element mounting cavity D, the optical path of the light emitter 310 is changed, reducing the risk of oil stains depositing on the surface of the light emitter 310, thereby improving the accuracy of the detection results and reducing the performance degradation of the light emitter 310 due to contamination, thus extending its service life.

[0054] Furthermore, at least one oil-blocking baffle 133 is provided between the light emitter 310 and the detection cavity C, and the oil-blocking baffle 133 has small holes for light to pass through.

[0055] By setting at least one layer of oil baffle 133, the small holes on the oil baffle 133 allow light to pass through smoothly while effectively blocking the intrusion of most oil fume particles, further preventing the oil fume airflow from entering the detection element mounting cavity D and directly contacting the light emitter 310. This greatly improves the device's anti-pollution capability, enabling the light emitter 310 to maintain normal operation for a long time in a relatively harsh oil fume environment, ensuring the accuracy and reliability of the detection.

[0056] In this embodiment, an extinction trap cavity E is provided on the other side of the detection cavity C to absorb or deflect light passing through the detection cavity, preventing it from being reflected back into the detection cavity C. The extinction trap cavity E is equipped with an absorbing material or a special geometry to guide or scatter light to a point where it can no longer be reflected back into the detection cavity C, thereby reducing the interference of stray light on detection accuracy.

[0057] In this embodiment, an airflow blocking structure 500 is provided inside the flow channel F, and the airflow blocking structure 500 is located upstream of the detection chamber along the airflow direction. The airflow blocking structure 500 enables the oil fume airflow in the flow channel F to collide multiple times. Through these collisions, larger particles in the oil fume airflow can be broken down into smaller particles before entering the detection area.

[0058] The cross-sectional area of ​​the flow channel F gradually decreases at the airflow blocking structure 500 to guide the airflow to accelerate through the airflow blocking structure.

[0059] The detection device, through the collision and decomposition effect of the airflow blocking structure 500, prevents large particles from settling and accumulating oil in the detection chamber, thus avoiding contamination of the detection element 300 and affecting its detection accuracy. Simultaneously, after mechanical collision with the airflow blocking structure, large particles break into smaller particles of similar diameter, resulting in a more uniform distribution as they pass through the detection element 300, thereby improving detection accuracy and efficiency. Furthermore, the flow channel F gradually decreases in cross-sectional area at the airflow blocking structure, increasing the airflow velocity and further enhancing the collision effect of the airflow blocking structure, thus improving oil filtration efficiency.

[0060] In this embodiment, see Figure 1 The flow channel F includes an air inlet section f1, a detection section f2, and an air outlet section f3. The air inlet section f1 is connected to the air inlet 111, the detection section f2 has a detection cavity C, and the detection element 300 detects the concentration of particulate matter in the airflow through the detection cavity C. The air outlet section f3 is connected to the air outlet 112 and is used to discharge the detected airflow.

[0061] In this embodiment, the airflow obstruction structure 500 includes multiple cylindrical structures 510, which are arranged in an alternating manner within the flow channel F. The cross-section of the cylindrical structures 510 is not specifically limited and can be circular, elliptical, rhomboid, etc. The staggered arrangement of the cylindrical structures 510 within the flow channel F allows particulate matter in the oil fume airflow to undergo multiple impacts and separation processes as it passes through, thereby effectively improving the decomposition efficiency of large particles.

[0062] The airflow obstruction structure 500 is either an integral part of the flow channel F or a detachable installation structure. An integrally molded structure improves the overall stability of the device and reduces assembly steps; while a detachable structure facilitates maintenance and cleaning. Users can disassemble and replace the airflow obstruction structure 500 according to actual usage, ensuring the device is always in optimal working condition. Example 2

[0063] In this embodiment, as Figures 2-4 As shown, the airflow blocking structure 500 can employ perforated baffles 520 with multiple openings, which are sequentially arranged within the flow channel F along the airflow direction. Multiple perforated baffles 520 are staggered, with the openings on adjacent baffles not completely overlapping. This allows particulate matter in the oil fume airflow to collide and separate multiple times as it passes through the perforated baffles 520, further enhancing the decomposition effect of large particles. Figure 4 As shown, the perforated baffle 520 can be tilted downward at an angle α relative to the airflow direction so that the oil droplets accumulated on the baffle can drip off smoothly. Example 3

[0064] In this embodiment, as Figure 5 As shown, the airflow obstruction structure 500 adopts a staggered baffle 530 design. Multiple staggered baffles 530 form an S-shaped meandering flow channel within the flow channel F. Through this structure, the oil fume airflow undergoes multiple turns within the flow channel F, causing particles to continuously collide and separate, reducing the presence of large particles. The staggered baffles 530 can be tilted relative to the airflow direction to allow oil droplets accumulated on the baffles to drip smoothly. Example 4

[0065] In this embodiment, the airflow obstruction structure can be a labyrinth channel structure (not shown). The labyrinth channel has multiple tortuous paths. As the oil fume airflow passes through the labyrinth channel, the airflow direction constantly changes, causing particles to collide in different directions, thereby breaking them down into smaller particles and reducing particle deposition. Simultaneously, the tortuous paths in the labyrinth structure effectively reduce airflow turbulence and ensure uniform distribution of particles within the channel F, ultimately ensuring efficient and accurate detection when the particles enter the detection chamber.

[0066] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A particulate matter concentration detecting device characterized by comprising: The application relates to a dust concentration detector. The dust concentration detector comprises a shell, an air inlet and an air outlet are formed in the shell, a flow channel is arranged in the shell and is communicated with the air inlet and the air outlet, a detection cavity is arranged in the flow channel, a detection element mounting cavity is arranged on one side of the detection cavity, a detection element is arranged in the detection element mounting cavity, the detection element comprises a light emitter and a light receiver, the light emitter is arranged in the detection element mounting cavity and is used for emitting light to the detection cavity, the light receiver is arranged in the detection cavity and is used for receiving light scattered by particulate matters, at least one reflecting component is arranged in the detection element mounting cavity, and the light emitted by the light emitter is reflected to the detection cavity through the reflecting component. At least one oil blocking baffle is arranged between the light emitter and the detection cavity, and a small hole for light to pass through is formed in the oil blocking baffle. An extinction trap cavity is arranged on the other side of the detection cavity, the extinction trap cavity is used for absorbing or deviating the light passing through the detection cavity and preventing the light from being reflected back to the detection cavity.

2. The particulate matter concentration detecting device according to claim 1, characterized by, An air flow blocking structure is arranged in the flow channel, and the air flow blocking structure is located upstream of the detection cavity along the air flow direction.

3. The particulate matter concentration detecting apparatus according to claim 1, characterized by, The air flow blocking structure comprises a plurality of columnar structures, and the columnar structures are arranged in the flow channel in a staggered mode.

4. The particulate matter concentration detecting apparatus according to claim 1, characterized by, The air flow blocking structure further comprises a plurality of open hole baffles provided with a plurality of open holes, a plurality of open hole baffles are arranged in the flow channel in sequence along the air flow direction, and the open holes on adjacent open hole baffles are arranged in a staggered mode.

5. The particulate matter concentration detecting device according to claim 4, characterized by The open hole baffles are arranged in a slanting mode relative to the air flow direction.

6. The particulate matter concentration detecting device according to claim 4, characterized by The air flow blocking structure comprises a plurality of staggered baffles arranged in a staggered mode, and the staggered baffles form an S-shaped circuitous flow channel.

7. The particulate matter concentration detecting apparatus according to claim 6, characterized by The staggered baffles are arranged in a slanting mode relative to the air flow direction.

8. The particulate matter concentration detecting device according to claim 4, characterized by, The air flow blocking structure is a labyrinth flow channel structure, and the labyrinth flow channel structure forms a zigzag path.

9. The particulate matter concentration detecting device according to claim 8, characterized by, ​ 10. The particulate matter concentration detecting device according to claim 4, characterized by ​

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