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 and a detection element installed in the shell, and an air inlet and an air outlet are formed in the shell; a flow channel communicated with the air inlet and the air outlet is arranged in the shell, an airflow blocking structure is arranged in the flow channel, the airflow blocking structure is located on the upstream of the detection element in the airflow direction, and the cross sectional area of the flow channel is gradually reduced at the airflow blocking structure so as to guide airflow to pass through the airflow blocking structure in an accelerated mode. According to the particulate matter concentration detection device, the airflow blocking structure is arranged in the flow channel, large particulate matter can be prevented from settling and accumulating oil in the detection cavity, pollution to the detection element is avoided, the detection precision of the detection element is improved, and the service life of the detection element is prolonged. Meanwhile, the cross sectional area of the flow channel at the airflow blocking structure is gradually reduced, the airflow speed can be increased, the collision effect of the airflow blocking structure is further improved, and the oil filtering effect is improved.

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. However, kitchen fumes contain a large number of grease particles, which easily deposit on the surface of the detection element, forming grease stains. This affects detection accuracy and sensitivity, accelerates element aging, and shortens the lifespan of the device. Existing detection devices lack effective oil-proofing measures, making it difficult to maintain stable detection performance over the long term. Utility Model Content

[0004] 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 setting an airflow blocking structure in the upstream flow channel of the detection chamber, large particles in the oil fume airflow can be decomposed into smaller particles, preventing oil from settling and covering the detection elements, thus improving detection accuracy. At the same time, the cross-sectional area of ​​the flow channel gradually decreases at the airflow blocking structure, which can increase the airflow velocity and further improve the collision effect of the airflow blocking structure, thereby improving the oil filtration effect.

[0005] This utility model provides a particulate matter concentration detection device, comprising:

[0006] The housing, and the detection element installed inside the housing;

[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 an airflow blocking structure, and the airflow blocking structure is located upstream of the detection element along the airflow direction.

[0008] The cross-sectional area of ​​the flow channel gradually decreases at the airflow blocking structure to guide the airflow to accelerate through the airflow blocking structure.

[0009] In some embodiments, the airflow obstruction structure includes a plurality of columnar structures, which are arranged alternately within the flow channel.

[0010] 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.

[0011] In some embodiments, the perforated baffle is inclined relative to the airflow direction.

[0012] 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.

[0013] In some embodiments, the staggered baffles are arranged at an angle relative to the airflow direction.

[0014] In some embodiments, the airflow obstruction structure is a labyrinth flow channel structure, which forms a tortuous path.

[0015] In some embodiments, the airflow blocking structure is an integral part of the flow channel, or the airflow blocking structure is detachably installed within the flow channel.

[0016] In some embodiments,

[0017] The flow channel is provided with a detection chamber, and the detection element detects the particulate matter concentration of the airflow through the detection chamber;

[0018] The airflow blocking structure is located near the air inlet, and the detection chamber is located near the airflow blocking structure.

[0019] In some embodiments,

[0020] The flow channel is provided with a detection chamber, and the detection element detects the particulate matter concentration of the airflow through the detection chamber;

[0021] The flow channel forms a bent flow channel at least along the two side walls of the housing; the airflow blocking structure is located near the air inlet, and the detection chamber is located near the air outlet.

[0022] Compared with the prior art, the advantages and positive effects of this utility model are:

[0023] The aforementioned particulate matter concentration detection device, through the collision and decomposition effect of the airflow obstruction structure, prevents large particles from settling and accumulating oil in the detection chamber, avoiding contamination of the detection element and affecting its detection accuracy. Simultaneously, after large particles pass through the airflow obstruction structure, they break into smaller particles of similar diameter, resulting in a more uniform distribution as they pass through the detection element, thereby improving detection accuracy and efficiency. Furthermore, the cross-sectional area of ​​the flow channel gradually decreases at the airflow obstruction structure, increasing the airflow velocity and further enhancing the collision effect of the airflow obstruction structure, thus improving oil filtration efficiency. Attached Figure Description

[0024] 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.

[0025] 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;

[0026] Figure 2 This is a schematic diagram of the internal structure of the particulate matter concentration detection device in Embodiment 2 of this utility model;

[0027] Figure 3 This is a schematic diagram of the flow of oil fume airflow in Embodiment 3 of this utility model, where the airflow blocking structure is a staggered baffle.

[0028] Figure 4 for Figure 3 Lateral cross-sectional view;

[0029] Figure 5 for Figure 3 A schematic diagram of the perforated baffle structure in the middle;

[0030] Figure 6 In Embodiment 4 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.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 - Housing; 111 - Air inlet; 112 - Air outlet;

[0033] 300 - Detection element; 310 - Light emitter; 320 - Light receiver;

[0034] 500 - Airflow blocking structure; 510 - Columnar structure; 520 - Perforated baffle; 530 - Staggered baffle;

[0035] Flow channel F; air inlet section f1; detection section f2; air outlet section f3; detection chamber C. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Reference Figures 1-6 These are some embodiments of the particulate matter concentration detection device of this utility model. Example

[0041] 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).

[0042] 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.

[0043] The circuit board is used to control the operating status of the detection element 300 and the fan.

[0044] The detection element 300 is used to detect the concentration of particulate matter in the airflow entering the device.

[0045] 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.

[0046] The fan is located inside the flow channel F and is used to drive the airflow within the flow channel F.

[0047] An airflow blocking structure 500 is provided inside the flow channel F, and is located upstream of the detection element 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.

[0048] 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.

[0049] The aforementioned particulate matter concentration detection device, through the collision and decomposition effect of the airflow obstruction structure, prevents large particles from settling and accumulating oil in the detection chamber, thus avoiding contamination of the detection element and affecting its detection accuracy. Simultaneously, after large particles pass through the airflow obstruction structure and undergo mechanical collision, they break into smaller particles of similar diameter, resulting in a more uniform distribution as they pass through the detection element, thereby improving detection accuracy and efficiency. Furthermore, the cross-sectional area of ​​the flow channel gradually decreases at the airflow obstruction structure, increasing the airflow velocity and further enhancing the collision effect of the airflow obstruction structure, thereby improving oil filtration efficiency.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In this embodiment, the flow channel F is a straight channel structure, and the airflow obstruction structure and the detection chamber are both located close to the air inlet. By arranging the airflow obstruction structure 500 close to the air inlet 111, particulate matter can be decomposed and processed in the early stage of the oil fume airflow entering the flow channel F, reducing the interference of large particles on the subsequent detection process. The detection chamber C is located close to the airflow obstruction structure 500, and the detection element 300 is located where the airflow just enters the flow channel F. Oil fume particles can quickly enter the detection chamber C, and the detection element 300 can immediately sense the concentration of particulate matter in the airflow, achieving a rapid response.

[0054] See Figure 1 The detection element 300 is an optical sensor, including a light emitter 310 and a light receiver 320.

[0055] 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.

[0056] Specifically, the light emitter 310 emits light to illuminate 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, meeting the requirements of high-precision measurement.

[0057] The light emitted by the light emitter 310 enters the detection cavity C through the through hole opened on the flow channel F.

[0058] The light receiver 320 is located inside 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 the concentration information of the particulate matter. Example

[0059] like Figure 2 As shown, in this embodiment, the flow channel F is arranged along at least two side walls of the housing 100, forming a bent airflow channel. For example, when the flow channel F is arranged along two side walls of the housing 100, it forms an L-shaped flow channel; when it is arranged along three side walls of the housing 100, it forms an inverted U-shaped flow channel.

[0060] The airflow blocking structure 500 is positioned near the air inlet 111, while the detection chamber C is positioned near the air outlet 112.

[0061] The detection chamber C is positioned close to the air outlet 112, which helps to extend the path of the oil fume airflow in the flow channel F, and the airflow tends to be stable near the air outlet 112. The detection element 300 can then operate in a stable airflow environment, thereby improving the reliability of the detection results and reducing measurement errors caused by airflow fluctuations. Example

[0062] In this embodiment, as Figures 3-5 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

[0063] In this embodiment, as Figure 6 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

[0064] 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.

[0065] 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 detection device, characterized in that, include: The housing, and the detection element installed inside the housing; 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 an airflow blocking structure, and the airflow blocking structure is located upstream of the detection element along the airflow direction. The cross-sectional area of ​​the flow channel gradually decreases at the airflow blocking structure to guide the airflow to accelerate through the airflow blocking structure.

2. The particulate matter concentration detection device according to claim 1, characterized in that, The airflow obstruction structure includes multiple columnar structures, which are arranged alternately within the flow channel.

3. The particulate matter concentration detection device according to claim 1, characterized in that, The airflow blocking structure also includes an open baffle with several openings. The multiple open baffles are arranged sequentially in the flow channel along the airflow direction, and the openings on adjacent open baffles are staggered.

4. The particulate matter concentration detection device according to claim 3, characterized in that, The perforated baffle is inclined relative to the airflow direction.

5. The particulate matter concentration detection device according to claim 1, characterized in that, The airflow blocking structure includes several staggered baffles, which form an S-shaped meandering flow channel.

6. The particulate matter concentration detection device according to claim 5, characterized in that, The staggered baffles are set at an angle relative to the airflow direction.

7. The particulate matter concentration detection device according to claim 1, characterized in that, The airflow obstruction structure is a labyrinth flow channel structure, which forms a tortuous path.

8. The particulate matter concentration detection device according to claim 1, characterized in that, The airflow blocking structure is an integral part of the flow channel, or the airflow blocking structure is detachably installed inside the flow channel.

9. The particulate matter concentration detection device according to claim 1, characterized in that, The flow channel is provided with a detection chamber, and the detection element detects the particulate matter concentration of the airflow through the detection chamber; The airflow blocking structure is located near the air inlet, and the detection chamber is located near the airflow blocking structure.

10. The particulate matter concentration detection device according to claim 1, characterized in that, The flow channel is provided with a detection chamber, and the detection element detects the particulate matter concentration of the airflow through the detection chamber; The flow channel forms a bent flow channel at least along the two side walls of the housing; the airflow blocking structure is located near the air inlet, and the detection chamber is located near the air outlet.

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