Range hood

Abstract

The utility model discloses a range hood which comprises a smoke collecting box body and an air quality detection module, and the air quality detection module comprises a sensor module; the air quality detection module further comprises an upper cover and a lower cover. The sensor module comprises a sensor body arranged in a closed space formed by the upper cover and the lower cover and a probe exposed out of the lower cover from the closed space. The range hood further comprises a sealing cover fixed in the smoke collecting box body, a detection opening is formed in the smoke collecting box body, the end, fixed to the smoke collecting box body, of the sealing cover is in an opening shape, the end of the sealing cover is tightly attached to the periphery of the detection opening, the air quality detection module is connected with the sealing cover, and the air quality detection module is connected with the detection opening. The probe is exposed out of the lower cover, extends into the sealing cover and is communicated with fluid outside the range hood through the detection opening.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] With the increasing pursuit of a healthy and environmentally friendly lifestyle, people are paying more and more attention to indoor air quality. Building materials used in new home renovations often release harmful gases such as formaldehyde over a long period of time. Living indoors for extended periods can lead to increased carbon dioxide concentrations, affecting human health, as well as increased humidity, which can cause bacteria to grow on furniture and clothing, leading to mold and other problems.

[0003] As a traditional household appliance capable of purifying indoor air, range hoods are increasingly being updated with products that also feature ventilation functions (drawing in fresh outdoor air and expelling harmful gases from the room). To facilitate automatic ventilation control, air quality sensors are typically installed to monitor air quality in real time. For example, Chinese Patent Application No. 202322958574.7 discloses a range hood system with indoor fresh air purification function, including a casing containing a fume extraction chamber and a fan. The casing also houses a main controller and an air collection and monitoring component. This component detects the concentration of pollutants in the air and feeds it back to a fresh air detection module. A fresh air detection vent is located on the side of the casing, and the air collection and monitoring component is positioned close to this vent.

[0004] When the user is not cooking or is away from home for an extended period, and the range hood system is in standby mode, the main controller activates the fresh air purification function. At this time, the air quality monitoring component detects the ambient air quality, collecting concentration information of pollutants such as CO, coal gas, and particulate matter, and feeding this information back to the processing module. Based on this concentration information, the processing module determines whether to activate the fan and, in conjunction with the fan speed control module, adjusts the fan speed accordingly. Typically, the air quality monitoring component is exposed to the cooking fumes and is fixed with adhesive, requiring complete disassembly for maintenance. This is difficult to disassemble, and the disassembled parts are generally not reusable, increasing overall maintenance costs. Furthermore, because the air quality monitoring component is located relatively far back, the fumes travel a longer path to reach the rear of the fan, requiring a longer time to trigger its activation. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a range hood that allows the air quality detection module to be reliably installed in an oil fume environment and avoids the influence of oil fumes.

[0006] The second technical problem to be solved by this utility model is to provide a range hood that facilitates the maintenance and disassembly of the air quality detection module, in order to address the shortcomings of the existing technology.

[0007] The third technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a range hood that improves the detection accuracy of the air quality detection module and enhances the overall air purification effect.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: a range hood, comprising a smoke collection box and an air quality detection module, wherein the air quality detection module includes a sensor module; characterized in that:

[0009] The air quality detection module also includes an upper cover and a lower cover, and the sensor module includes a sensor body disposed in the closed space formed by the upper cover and the lower cover, and a probe protruding from the closed space to the outside of the lower cover.

[0010] The range hood also includes a sealing cover fixed inside the smoke collection box. The smoke collection box has a detection port. The end of the sealing cover that is fixed to the smoke collection box is open. The end of the sealing cover is close to the outer periphery of the detection port. The air quality detection module is connected to the sealing cover. The probe protrudes from the lower cover and extends into the sealing cover, and is in fluid communication with the outside of the range hood through the detection port.

[0011] The sensor body of the sensor module is placed in a relatively enclosed space formed by the upper and lower covers. Only the probe of the sensor module is exposed in this enclosed space, and the probe is also exposed in another space isolated from oil fumes formed by the sealing cover and the box, which can prevent oil fumes from affecting the detection of the probe.

[0012] To facilitate the creation of space for installing the sensor module, the upper cover includes a substrate and a mounting base. The mounting base is formed by protrusions on the surface of the substrate. One end of the mounting base is closed by the substrate, while the opposite end is open. The sensor body is disposed inside the mounting base, and the lower cover is closed at the open end of the mounting base.

[0013] To facilitate electrical connection between the sensor module and the control device of the range hood, the base plate of the upper cover is provided with a wire outlet hole. The position of the wire outlet hole corresponds to the mounting base. The wire outlet hole penetrates the base plate along the thickness direction of the base plate. The wire harness connected to the sensor body is led out through the wire outlet hole. The wire outlet hole can be easily sealed by means of glue or other methods to further isolate oil fumes.

[0014] To facilitate the installation of the upper and lower covers, the upper and lower covers are snap-fitted together.

[0015] To improve the airtightness of the space formed by the upper and lower covers, the air quality detection module also includes a sealing gasket, which seals at least the outer periphery of the connection between the upper and lower covers.

[0016] To further improve sealing performance, the sealing gasket includes a gasket body covering the outer periphery of the mounting base and the lower cover, the gasket body extending to the substrate, and a flange edge formed at the end of the gasket body near the substrate.

[0017] The sealing cover is also connected to the top cover. The sealing cover includes a hollow cover body with openings at both ends. The cover body is fixed to the smoke collection box body. The sealing gasket is snapped into the cover body. The sealing cover also includes a flange formed on the end of the cover body facing the substrate. The flange brings the flange edge close to the surface of the substrate located on the outer periphery of the mounting base.

[0018] To further improve the sealing performance between the gasket and the cover, an annular skirt is formed on the outer periphery of the gasket. Each skirt gradually slopes outward from the outer periphery of the gasket towards the substrate, and the skirt is locked into the inner peripheral wall of the cover.

[0019] The technical solution adopted by this utility model to solve the second technical problem mentioned above is that the sealing cover is detachably connected to the air quality detection module.

[0020] Since the damage to the air quality detection module is mainly due to a problem with the sensor module itself, the sealing cover can be firmly fixed to the smoke collection box by means of adhesive or welding, while the air quality detection module can be detachably connected to the sealing cover, which facilitates the disassembly and maintenance of the whole unit.

[0021] To facilitate the disassembly and assembly of the air quality detection module, the sealing cover and the upper cover are rotated and snapped together for fixation.

[0022] Furthermore, the upper cover includes a disc-shaped substrate and a mounting base formed on the substrate, one end of the mounting base is closed by the substrate and the other end is open, the sensor body is disposed in the mounting base, and the lower cover is closed at the opening of the mounting base.

[0023] The outer peripheral edge of the substrate protrudes radially outward and is provided with a flange. The flange and the mounting base are located on the same side of the substrate. The flange includes a first flange extending from the edge of the substrate along the axial direction of the substrate and a second flange extending radially inward from the end of the first flange away from the substrate, thereby forming a groove between the flange and the substrate.

[0024] The sealing cover includes a cover body that covers the mounting base and the lower cover, and a flange formed on the end of the cover body facing the substrate. A portion of the outer peripheral edge of the flange protrudes radially outward to form a claw that engages with the slot in a rotating engagement.

[0025] To facilitate limiting the circumferential rotation position of the sealing cover, a stop portion is formed at one circumferential end of the slot on the substrate, and the stop portion can abut against the claw in the circumferential direction.

[0026] To prevent jamming when the sealing cover is inserted, a guide portion is formed at the circumferential end of the second flange away from the stop portion along the circumferential direction of the slot, and the guide portion gradually approaches the substrate in the direction of the stop portion.

[0027] To prevent the sealing cover and the top cover from detaching, a protrusion is formed on the side of the second flange facing the substrate, and an anti-detachment opening is formed on the claw to cooperate with the protrusion.

[0028] Furthermore, along the circumference of the slot, the portion of the protrusion adjacent to the second flange has a notch, thereby increasing the elasticity of the protrusion, reducing installation resistance, and improving operational convenience.

[0029] The technical solution adopted by this utility model to solve the third technical problem mentioned above is as follows: the smoke collection box includes side plates located on the left and right sides, the side plates include a first plate and a second plate, the second plate extends gradually from the rear end of the first plate towards the other side plate, the detection port is provided on the second plate, and the sealing cover is fixed to the second plate.

[0030] Based on the path of oil fume intake and the negative pressure distribution of the range hood, oil fumes are more easily drawn into the front and left / right front areas compared to the left / right rear and the area behind the range hood. The sensor module works by detecting the concentration of particles in the air; once a set value is reached, it triggers the range hood to operate, drawing in and expelling the polluted air. While placing the sensor module at the rear of the range hood improves overall purification accuracy, the longer path of the oil fumes at the rear requires more time to trigger its operation. Placing it at the front of the left / right sides results in the sensor module being easily triggered, but the operation may stop before the oil fumes at the rear are expelled, leading to less than ideal purification. Therefore, by placing the air quality detection module on the inwardly tilted second plate, detection accuracy is improved, balancing the trigger time on the left / right sides with the purification effect of a rear-mounted module, achieving better purification functionality.

[0031] Compared with the prior art, the advantages of this utility model are as follows: the sensor body of the sensor module is set in a relatively closed space formed by the upper and lower covers, with only the probe of the sensor module exposed in this closed space. Furthermore, the probe is exposed in another space isolated from oil fumes, formed by the sealing cover and the housing, which can prevent oil fumes from affecting the probe's detection. The air quality detection module is detachably connected to the sealing cover, facilitating disassembly and maintenance of the entire machine. By setting the air quality detection module on the inwardly inclined second plate, the detection accuracy is improved, taking into account the trigger time of the left and right sides and the purification effect of the rear plate, thus achieving better purification function. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present utility model (viewed from front to back);

[0033] Figure 2 This is a schematic diagram of a range hood according to an embodiment of the present utility model (viewed from front to back);

[0034] Figure 3 for Figure 2 A schematic diagram of the decomposed structure;

[0035] Figure 4 This is a schematic diagram of the air quality detection module and sealing cover of the range hood according to an embodiment of the present utility model;

[0036] Figure 5 This is an exploded structural diagram of the air quality detection module and sealing cover of the range hood according to an embodiment of the present utility model;

[0037] Figure 6 This is a schematic diagram of the air quality detection module of the range hood according to an embodiment of the present utility model;

[0038] Figure 7 This is a schematic diagram of the air quality detection module of the range hood according to an embodiment of the present invention (and...). Figure 7 (Different perspectives);

[0039] Figure 8 This is a cross-sectional view of the air quality detection module and sealing cover of the range hood according to an embodiment of the present utility model;

[0040] Figure 9 This is a schematic diagram of the upper cover of the air quality detection module of the range hood according to an embodiment of the present utility model;

[0041] Figure 10 This is a cross-sectional view of the upper cover of the air quality detection module of the range hood according to an embodiment of the present utility model;

[0042] Figure 11 This is a cross-sectional view showing the fit between the top cover and the sealing cover of the air quality detection module of the range hood according to an embodiment of the present invention. Detailed Implementation

[0043] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0045] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0046] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0047] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0048] The specific angles, heights, widths, and other values ​​given in the following detailed embodiments are all measured in accordance with the specific accompanying drawings.

[0049] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0050] See Figures 1-3A range hood includes a smoke collection box 1. A fan (not shown) that powers the range hood can be installed inside the smoke collection box 1 (forming a side-suction range hood), or it can be installed inside a casing 2 above the smoke collection box 1, or it can be arranged in other existing technologies, such as installed above the ceiling.

[0051] The front side of the smoke collection box 1 forms a smoke inlet (not shown). The range hood may also include a smoke baffle 4, which can open and close the smoke inlet. This structure is the same as the prior art and will not be described in detail here.

[0052] The smoke collection box 1 includes side plates 12 located on the left and right sides, with the smoke inlet located between the two side plates 12. Each side plate 12 includes an integrally formed first plate 121 and a second plate 122. The second plate 122 extends rearward from the rear end of the first plate 121. The first plate 121 and the second plate 122 are bent. The first plate 121 can extend straight in the front-rear direction or extend at an angle relative to the front-rear direction. The second plate 122 extends gradually from the rear end of the first plate 121 towards the other side plate 12. That is, in this embodiment, the second plate 122 of the right side plate 12 extends gradually to the left from front to back, making the intersection of the first plate 121 and the second plate 122 the most prominent part.

[0053] See Figures 3 to 11 The range hood also includes an air quality detection module 5 and a sealing cover 6. The air quality detection module 5 includes a sensor module 51, an upper cover 52, a lower cover 53, a sealing gasket 54, and a wiring harness 55. The sensor module 51 includes a sensor body 511 and a probe 512. The sensor body 511 may include a circuit board for data processing and transmission. The upper cover 52 includes a substrate 521 and a mounting base 522 formed on the substrate 521. The substrate 521 is generally disc-shaped, and the mounting base 522 is located in the middle of the substrate 521, is cylindrical, and is formed by protrusions from the surface of the substrate 521. One axial end of the mounting base 522 is closed by the substrate 521, while the opposite axial end is open. The sensor body 511 is disposed inside the mounting base 522, and the lower cover 53 is closed at the opening of the mounting base 522, forming a relatively enclosed space. The probe 512 of the sensor module 51 extends from inside the mounting base 522 out of the lower cover 53.

[0054] The sealing gasket 54 is hollow and covers the outer periphery of the mounting base 522 and the lower cover 53, at least sealing the connection between the mounting base 522 and the lower cover 53. The upper cover 52, the lower cover 53, and the sealing gasket 54 are generally cylindrical to allow for rotational fixation. The sealing gasket 54 includes a gasket body 541, which extends to the base plate 521 for better fit with the sealing cover 6. A flange edge 542 is formed at the end of the gasket 541 near the base plate 521, and the flange edge 542 is in close contact with the surface of the base plate 521 located on the outer periphery of the mounting base 522. An annular skirt edge 543 is also formed on the outer periphery of the gasket body 541, and at least two skirt edges 543 can be arranged at intervals along the axial direction of the gasket body 541. Each skirt edge 543 gradually slopes radially outward from the outer periphery of the gasket body 541 toward the base plate 521.

[0055] The base plate 521 of the top cover 52 has a wiring hole 523, which corresponds to the mounting base 522. The wiring hole 523 extends through the base plate 521 along its thickness direction (axial direction). The wiring harness 55 connected to the sensor body 511 of the sensor module 51 inside the mounting base 522 can be led out through the wiring hole 523. The wiring hole 523 is then sealed and fixed using methods such as applying adhesive to ensure isolation from external oil. The wiring harness 55 is connected to the control device of the range hood to control the fan.

[0056] For ease of operation, the upper cover 52 and the lower cover 53 are fixed together by snapping. In this embodiment, the fixing base 522 is provided with a snap-fit ​​524, and the lower cover 53 includes a snap-fit ​​531. The snap-fit ​​531 is snapped into the snap-fit ​​524 to fix the upper cover 52 and the lower cover 53.

[0057] The sealing cover 6 is fixed to the side (left or right) inside the smoke collection box 1. In this embodiment, the sealing cover 6 is located on the side plate 12 on the right side of the range hood (relative to the user). During installation, the air quality detection module 5, especially the lower cover 53, is inserted into the sealing cover 6, and the sealing cover 6 covers the sealing gasket 5. The flange edge 542 and skirt edge 543 of the sealing gasket 54 ensure the sealing requirements at the joint with the sealing cover 6, ultimately achieving the overall sealing of the air quality detection module 5 within the oil passage space.

[0058] The second plate 122 has an opening forming a detection port 123. The sealing cover 6 includes a hollow cover 61 with openings at both ends. The cover 61 is also generally cylindrical and its size is adapted to the air quality detection module 5. One end of the cover 61 corresponds to the detection port 123 and is tightly attached and fixed to the side plate 12 of the smoke collection box 1. The end of the cover 61 is attached to the outer periphery of the detection port 123 to prevent oil fumes from entering the sealing cover 6 from here. The other end corresponds to the top cover 52. The probe 51 of the sensor module 51 of the air quality detection module 5 faces the detection port 123. Through the opening on the cover 61, the probe 512 of the sensor module 51 can correspond to the detection port 123, allowing the sensor module 51 to be in fluid communication with the outside of the smoke collection box 1 (i.e., the kitchen indoor environment where the range hood is located) for detection. The sealing cover 6 can be fixed to the side plate 12 by existing methods such as adhesive or welding.

[0059] To facilitate the assembly and disassembly of the air quality detection module 5 and the sealing cover 6, the air quality detection module 5 and the sealing cover 6 are installed by rotational fixation. The outer peripheral edge of the base plate 521 of the upper cover 52 of the air quality detection module 5 protrudes radially outward and is provided with a flange 525. The flange 525 and the mounting base 522 are located on the same side of the base plate 521. The flange 525 includes a first flange 5251 extending axially from the edge of the base plate 521 along the mounting base 522 (base plate 521) and a second flange 5252 extending radially inward from the end of the first flange 5251 away from the base plate 521. The flange 525 may have two flanges centrally symmetrically arranged relative to the base plate 521. A groove 526 is thus formed between the flange 525 and the base plate 521. Along the circumferentially extending groove 526, the sealing cover 6 can be inserted into the groove 526 with relative rotation. A stop portion 527 is formed at one circumferential end of the slot 526 on the substrate 521. The stop portion 527 extends axially along the mounting base 522, thereby limiting the rotation angle during installation. A protrusion 5253 is formed on the side of the second flange 5252 facing the substrate 521, thereby forming an anti-loosening structure. Along the circumference of the slot 526, a notch 5254 is formed at the portion of the protrusion 5253 adjacent to the second flange 5252, thereby increasing the elasticity of the protrusion 5253, reducing installation resistance, and improving operational convenience.

[0060] Along the circumference of the slot 526, the second flange 5252 has a guide portion 5255 formed at the circumferential end away from the stop portion 527. The guide portion 5255 gradually approaches the substrate 521 in the direction of the stop portion 527, further improving the convenience of operation and avoiding jamming.

[0061] The sealing cover 6 also includes a flange 62 formed on one end of the cover 61 facing the substrate 521. The flange 62 extends radially outward from the end of the cover 61. A portion of the outer peripheral edge of the flange 62 protrudes radially outward to form a claw 63. The claw 63 can be engaged into the slot 526 of the upper cover 52. An anti-disengagement opening 631 is formed on the claw 63, and the anti-disengagement opening 631 cooperates with the protrusion 5253.

[0062] During installation, the claw 63 of the sealing cover 6 first contacts the guide portion 5255, and then continues to rotate into the slot 526 until it contacts the stop portion 527 and stops. The direction of rotation is as follows: Figure 11 As shown in the clockwise direction, protrusion 5253 engages with the anti-disengagement opening 631, preventing the sealing cover 6 from rotating in the opposite direction and detaching from the upper cover 52. For disassembly, simply rotate the sealing cover 6 in the reverse direction. See also... Figure 8 In the installed state, the claws 63 of the sealing cover 6 are engaged in the slot 526, so the flange 62 can press the flange edge 542 of the sealing gasket 54 against the base plate 521, while the skirt edge 543 of the sealing gasket 54 is clamped against the inner peripheral wall of the cover 61.

[0063] The sealing cover 6 and the air quality detection module 5 can also be connected using other existing detachable connection methods.

[0064] Since the damage to the air quality detection module 5 is mainly due to a problem with the sensor module 51 itself, the sealing cover 6 is firmly fixed to the side plate 12 of the smoke collection box 1 by means of adhesive or welding. The sealing cover 6 and the air quality detection module 5 are both circular in shape. In actual installation, the air quality detection module 5 can be easily disassembled and fixed to the whole machine through rotation and the aforementioned stop and anti-loosening structure.

[0065] Based on the path of oil fume intake and the negative pressure distribution of the range hood, oil fumes in the front and left / right front areas of the range hood are more easily drawn in than those in the left / right rear areas and behind the range hood. The sensor module 51 works by detecting the concentration of particles in the air; once a set value is reached, it triggers the range hood to operate, drawing in and expelling the polluted air. While placing the sensor module 51 at the rear of the range hood can improve overall purification accuracy, the longer path of the oil fumes at the rear requires more time to trigger its operation. If placed at the front of the left / right sides, the sensor module 51 is easily triggered, but its operation may stop before the oil fumes at the rear are expelled, resulting in a less than ideal purification effect. Therefore, in this embodiment, it is placed on the inwardly inclined second plate 122, balancing the trigger time on the left and right sides with the purification effect of a rear-mounted sensor, achieving better purification functionality.

[0066] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood comprising a fume collecting box (1) and an air quality detection module (5), the air quality detection module (5) comprising a sensor module (51); characterized in that: the air quality detection module (5) further comprises an upper cover (52) and a lower cover (53), the sensor module (51) comprising a sensor body (511) arranged in a closed space formed by the upper cover (52) and the lower cover (53), and a probe (512) exposed to outside of the lower cover (53) in the closed space; the range hood further comprises a sealing cover (6) fixed in the fume collecting box (1), the fume collecting box (1) being provided with a detection port (123), the sealing cover (6) having an open end fixed to the fume collecting box (1), the end of the sealing cover (6) being tightly attached to the outer periphery of the detection port (123), the air quality detection module (5) being connected to the sealing cover (6), the probe (512) being exposed to the lower cover (53) and extending into the sealing cover (6), and being in fluid communication with the outside of the range hood through the detection port (123).

2. The hood according to claim 1, characterized in that: the upper cover (52) comprises a base plate (521) and a mounting seat (522), the mounting seat (522) being formed by protruding from the surface of the base plate (521), one end of the mounting seat (522) being closed by the base plate (521) and the other end being open, the sensor body (511) being arranged in the mounting seat (522), and the lower cover (53) being closed at the opening of the mounting seat (522).

3. The hood according to claim 2, characterized in that: the base plate (521) of the upper cover (52) is provided with a wire outlet hole (523), the wire outlet hole (523) corresponding to the mounting seat (522), the wire outlet hole (523) penetrating through the base plate (521) along the thickness direction of the base plate (521), and the wire harness (55) connected to the sensor body (511) being led out through the wire outlet hole (523).

4. The hood according to claim 2, characterized in that: the upper cover (52) and the lower cover (53) are connected by clamping.

5. The hood according to claim 2, characterized in that: the air quality detection module (5) further comprises a sealing gasket (54), the sealing gasket (54) being arranged at least at the connection between the upper cover (52) and the lower cover (53).

6. The hood according to claim 5, characterized in that: the sealing gasket (54) comprises a gasket body (541) wrapped around the outer periphery of the mounting seat (522) and the lower cover (53), the gasket body (541) extending to the base plate (521), and a flange (542) being formed at the end of the gasket body (541) close to the base plate (521); the sealing cover (6) is further connected to the upper cover (52), the sealing cover (6) comprising a hollow cover body (61) having two open ends, the cover body (61) being fixed to the fume collecting box (1), and the sealing gasket (54) being clamped into the cover body (61); the sealing cover (6) further comprises a flange (62) formed at one end of the cover body (61) facing the base plate (521), the flange (62) tightly attaching the flange (542) to the surface of the base plate (521) located at the outer periphery of the mounting seat (522).

7. The hood according to claim 6, characterized in that: The outer periphery of the pad body (541) is further formed with annular skirts (543), each of which is gradually inclined from the outer periphery of the pad body (541) radially outward to the base plate (521), and the skirts (543) are clamped with the inner circumferential wall of the cover body (61).

8. The hood according to claim 1, characterized in that: The sealing cover (6) is detachably connected with the air quality detection module (5).

9. The hood according to claim 8, characterized in that: The sealing cover (6) is rotationally clamped and fixed with the upper cover (52).

10. The hood according to claim 9, characterized in that: The upper cover (52) comprises a disc-shaped base plate (521) and a mounting seat (522) formed on the base plate (521), one end of the mounting seat (522) is closed by the base plate (521) and the other end is open, the sensor body (511) is arranged in the mounting seat (522), and the lower cover (53) is closed at the opening of the mounting seat (522). Part of the outer peripheral edge of the base plate (521) protrudes radially outward and is provided with a flange portion (525), the flange portion (525) is located on the same side of the base plate (521) as the mounting seat (522), the flange portion (525) comprises a first flange (5251) extending along the axial direction of the base plate (521) from the edge of the base plate (521) and a second flange (5252) extending radially inward from the end of the first flange (5251) away from the base plate (521), so that a clamping groove (526) is formed between the flange portion (525) and the base plate (521). The sealing cover (6) comprises a cover body (61) covering the outside of the mounting seat (522) and the lower cover (53), and a flange (62) formed at one end of the cover body (61) facing the base plate (521), part of the outer peripheral edge of the flange (62) protrudes radially outward to form a clamping jaw (63) rotationally clamped and matched with the clamping groove (526).

11. The hood according to claim 10, characterized in that: The base plate (521) forms a stop portion (527) at one end of the clamping groove (526) in the circumferential direction, and the stop portion (527) can abut against the clamping jaw (63) in the circumferential direction.

12. The hood according to claim 11, characterized in that: Along the circumferential direction of the clamping groove (526), the second flange (5252) forms a guide portion (5255) at the circumferential end away from the stop portion (527), and the guide portion (5255) gradually approaches the base plate (521) in the direction of the stop portion (527).

13. The hood according to claim 10, characterized in that: The second flange (5252) forms a protrusion (5253) on the side facing the base plate (521), and the clamping jaw (63) forms an anti-falling opening (631) matched with the protrusion (5253).

14. The hood according to claim 13, characterized in that: Along the circumferential direction of the clamping groove (526), the protrusion (5253) forms a notch (5254) adjacent to the second flange (5252).

15. The hood according to any one of claims 1-14, characterized in that: The smoke collecting box body (1) comprises side plates (12) located on the left and right sides, the side plate (12) comprises a first plate body (121) and a second plate body (122), the second plate body (122) is gradually inclined and extends from the rear end of the first plate body (121) to the direction of the other side plate (12), the detection port (123) is arranged on the second plate body (122), and the sealing cover (6) is fixed with the second plate body (122).

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